CN101506866A - Liquid crystal display device - Google Patents

Liquid crystal display device Download PDF

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Publication number
CN101506866A
CN101506866A CN200780031269.4A CN200780031269A CN101506866A CN 101506866 A CN101506866 A CN 101506866A CN 200780031269 A CN200780031269 A CN 200780031269A CN 101506866 A CN101506866 A CN 101506866A
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pixel
sub
voltage
liquid crystal
vertical scanning
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CN101506866B (en
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下敷领文一
北山雅江
入江健太郎
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Sharp Corp
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Sharp Corp
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3614—Control of polarity reversal in general
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • G09G3/3655—Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0421—Structural details of the set of electrodes
    • G09G2300/0426—Layout of electrodes and connections
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0439—Pixel structures
    • G09G2300/0443—Pixel structures with several sub-pixels for the same colour in a pixel, not specifically used to display gradations
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G09G2300/0852—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor being a dynamic memory with more than one capacitor
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0262—The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/04—Display protection
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source

Abstract

A liquid crystal display device according to the present invention includes a plurality of pixels, each including first and second subpixels. When a predetermined grayscale tone is displayed continuously through four or more consecutive even number of vertical scanning periods, the first and second subpixels have different luminances in at least two of the even number of vertical scanning periods, first polarity periods that are included in the vertical scanning periods and that maintain a first polarity are as long as second polarity periods that are also included in the vertical scanning periods and that maintain a second polarity for each of the first and second subpixels, and in each of the first and second polarity periods, the difference between the average of effective voltages applied to the liquid crystal layer of the first subpixel and that of effective voltages applied to the liquid crystal layer of the second subpixel is substantially equal to zero.

Description

Liquid crystal indicator
Technical field
The present invention relates to liquid crystal indicator, in more detail, relate to improve the liquid crystal indicator of the angle of visibility interdependence of γ characteristic.
Background technology
Liquid crystal indicator is the flat display apparatus with advantages such as high-resolution, slim, light weight and low power consumptions, in recent years, along with the raising of the raising of display performance, productive capacity and with respect to the raising of the price competitiveness of other display device, its market scale enlarges rapidly.
In the liquid crystal indicator of general in the past twisted nematic mode (Twist Nematic Mode:TN pattern), major axis and substrate surface almost parallel with liquid crystal molecule of positive dielectric constant anisotropy, and implementation orientation is handled, and makes its thickness direction along liquid crystal layer twist approximate 90 degree between upper and lower base plate.If this liquid crystal layer is applied voltage, then liquid crystal molecule is parallel to electric field and erects, and eliminates twisted-oriented (TwistAlignment).In the liquid crystal indicator of TN pattern, follow the liquid crystal molecular orientation that causes because of voltage to change the optical activity that produces by utilization and change, can control the transmitted light flux.
The production surplus of such TN mode LCD is big and throughput rate is high, but then, especially has problems on the angle of visibility characteristic at display performance.Specifically there is following problem: as if display surface from oblique observation TN mode LCD, then the contrast of display degree significantly reduces, for can clearly observing from top view from black to white a plurality of image gray, when the direction that tilts was observed, the luminance difference between gray scale was very not obvious.But also there is following problem: gray-scale displayed characteristic counter-rotating occurs, what see during from oblique the observation for darker part from top view is bright phenomenon (gray inversion phenomenon).
In recent years, as the liquid crystal indicator that improves the angle of visibility characteristic in the TN mode LCD, developed the liquid crystal indicator of in-plane switching mode (In-Panel Switching Mode:IPS pattern), multi-domain vertical orientation mode (Multi-domain Vertical Alignment Mode:MVA pattern), rotational symmetry alignment mode (Axially Symmetric Alignment Mode:ASM pattern) etc.In the liquid crystal indicator of these novel patterns (wide view angle pattern), solved the above-mentioned particular problem relevant with the angle of visibility characteristic, the demonstration contrast during promptly from oblique observation display surface significantly reduces and the problem of display gray scale counter-rotating.
Yet, under the situation that the liquid crystal indicator display quality further improves, nowadays as the problem of angle of visibility characteristic, the γ characteristic of the γ characteristic during its top view during with oblique observation is different, the problem of the angle of visibility interdependence of γ characteristic becomes more and more significant just again.Here, the γ characteristic is the gray scale interdependence of display brightness, because the γ characteristic with different obliquely, makes the gray scale show state different because of the difference of direction of observation at forward, therefore when the image of display photos etc. or demonstration TV especially can become problem when broadcasting etc.
The method of using as the angle of visibility interdependence of improving the γ characteristic, known have a following method: by in a pixel plural sub-pixel being set, when intermediate luminance shows, make the brightness of one of them sub-pixel be different from the brightness of other sub-pixel, thereby improve the angle of visibility interdependence (for example, with reference to patent documentation 1 and patent documentation 2) of γ characteristic.
In the liquid crystal indicator that patent documentation 1 is disclosed, the effective voltage of the liquid crystal layer by making second sub-pixel when intermediate luminance shows is different from the effective voltage of the liquid crystal layer of first sub-pixel, and make the brightness of first sub-pixel different, thereby improve the angle of visibility interdependence of γ characteristic with the brightness of second sub-pixel.Because the transmissivity of liquid crystal layer changes according to the absolute value of effective voltage, and it is irrelevant with the direction of an electric field that liquid crystal layer is applied (direction of line of electric force), therefore in the liquid crystal indicator that patent documentation 1 is disclosed, by making the direction of an electric field that liquid crystal layer is applied alternately reverse every vertical scanning period, thereby suppress the biasing of DC component (DC level), solve the problem on the reliabilities such as burning screen.
In addition, in the liquid crystal indicator that patent documentation 2 is disclosed, the light and shade of first sub-pixel and second sub-pixel (is for example reversed every vertical scanning period, make the brightness of first sub-pixel be higher than the brightness of second sub-pixel in first vertical scanning period, make the brightness of second sub-pixel be higher than the brightness of first sub-pixel in second vertical scanning period), make that simultaneously the direction of an electric field that liquid crystal layer is applied reverses every vertical scanning period.If a sub-pixel in a plurality of sub-pixels is a bright state always, then see coarse demonstration sometimes, but in the liquid crystal indicator that patent documentation 2 is disclosed, reverse every vertical scanning period by the light and shade that makes first sub-pixel and second sub-pixel, coarse to prevent to show.
In addition, as mentioned above, demonstration and driving for the angle of visibility interdependence by the brightness that the makes a plurality of sub-pixels γ of improvement characteristic inequality are called as many pixel demonstrations, many pixel drive, the demonstration of area gray scale, the driving of area gray scale etc. in this manual sometimes.
Patent documentation 1: the Jap.P. spy opens the 2004-62146 communique
Patent documentation 2: the Jap.P. spy opens 2003-295160 communique (No. 6958791 instructions of United States Patent (USP))
Summary of the invention
In the liquid crystal indicator of patent documentation 1,, so can find out the sub-pixel light and shade sometimes and show coarse because the brightness of first sub-pixel is higher than the brightness of second sub-pixel when intermediate luminance shows always.
In addition, in the liquid crystal indicator of patent documentation 2, because make the direction of an electric field that liquid crystal layer is applied and the light and shade of sub-pixel reverse every vertical scanning period, therefore when a sub-pixel was brighter than other sub-pixel, the direction of an electric field that liquid crystal layer is applied was identical always.
For example, in the liquid crystal indicator of patent documentation 2, in a certain vertical scanning period, the absolute value of the effective voltage that applies on first sub-pixel is bigger than the absolute value of the effective voltage that applies on second sub-pixel, when first sub-pixel was brighter than second sub-pixel, the electric field that liquid crystal layer is applied was from the side (state orientation that electric field is such be called " first polarity ") of pixel electrode side towards comparative electrode.In next vertical scanning period, the absolute value of the effective voltage that applies on second sub-pixel is bigger than the absolute value of the effective voltage that applies on first sub-pixel, second sub-pixel is brighter than first sub-pixel, and the electric field that liquid crystal layer is applied is from the side (state orientation that electric field is such be called " second polarity ") of comparative electrode side towards pixel electrode.Also have, in next vertical scanning period, the absolute value of the effective voltage that applies on first sub-pixel is bigger than the absolute value of the effective voltage that applies on second sub-pixel, first sub-pixel is brighter than second sub-pixel, be first polarity, again in next vertical scanning period, the absolute value of the effective voltage that applies on second sub-pixel is bigger than the absolute value of the effective voltage that applies on first sub-pixel, second sub-pixel is brighter than first sub-pixel, is second polarity.
As mentioned above, in the liquid crystal indicator of patent documentation 2, because the absolute value of the effective voltage that applies on first sub-pixel all is first polarity when big, the absolute value of the effective voltage that applies on second sub-pixel all is second polarity when big, therefore the mean value of the effective voltage that applies on first sub-pixel is first polarity, and the mean value of the effective voltage that applies on second sub-pixel is second polarity.
In addition, in general liquid crystal indicator, if under the residual state that DC voltage component arranged in the non-vanishing state of the mean value of the voltage that applies on the pixel, the voltage that promptly on pixel, applies, the long-time same image of demonstration that continues, even then switch display image after this, the long-time image retention that continues to show before also producing, promptly be known as and burn the phenomenon of screen.Burn the screen phenomenon for fear of this, in general liquid crystal indicator, make that by AC driving (alternately applying first polar voltages and second polar voltages that absolute value equates) pixel the mean value that is applied to the voltage on the liquid crystal layer is zero.In addition, be under zero the situation can not make average voltage by AC driving, carry out the adjustment of relative voltage again, be zero thereby make average voltage.
Yet, in the liquid crystal indicator of patent documentation 2, because the mean value difference of the effective voltage of first sub-pixel and second sub-pixel, even therefore adjust relative voltage, can for zero only be one of them sub-pixel also, and the average voltage of other sub-pixel can't be adjusted into zero.In this case, produce to burn screen in the sub-pixel that can not adjust, its result, for whole display device, the generation of just can't inhibition of sintering shielding.Thereby in the liquid crystal indicator of patent documentation 2, the problem of existence is, can't make the average voltage that applies on first, second sub-pixel is zero together, thereby the problem on the reliability such as screen takes place to burn.
The present invention finishes in view of the above problems, and its purpose is to provide a kind of liquid crystal indicator that suppresses to show the problem generation on the reliabilities such as coarse and burning screen.
Liquid crystal indicator of the present invention possesses a plurality of pixels that comprise first sub-pixel and second sub-pixel respectively, and above-mentioned first sub-pixel and above-mentioned second sub-pixel have respectively separately: comparative electrode; Pixel electrode; And the liquid crystal layer that between above-mentioned comparative electrode and above-mentioned pixel electrode, disposes, above-mentioned first sub-pixel and above-mentioned second sub-pixel above-mentioned pixel electrode separately, be respectively first pixel electrode and second pixel electrode, above-mentioned first sub-pixel and above-mentioned second sub-pixel above-mentioned comparative electrode separately are public unitary electrodes, when the middle gray of being scheduled in the continuous even number vertical scanning period more than four shows, at least two vertical scanning period in above-mentioned even number vertical scanning period, above-mentioned first sub-pixel is different with the brightness of above-mentioned second sub-pixel, each sub-pixel for above-mentioned first sub-pixel and above-mentioned second sub-pixel, polarity in above-mentioned even number vertical scanning period is the length between first polarity epoch of first polarity, and polarity is the equal in length between second polarity epoch of second polarity, in during between above-mentioned first polarity epoch and between above-mentioned second polarity epoch each, the mean value of the effective voltage that the above-mentioned liquid crystal layer of above-mentioned first sub-pixel is applied, the difference of the mean value of the effective voltage that applies with above-mentioned liquid crystal layer to above-mentioned second sub-pixel is actual to be zero.
In one embodiment, in each pixel of above-mentioned a plurality of pixels, if setting the effective voltage that the above-mentioned liquid crystal layer to above-mentioned first sub-pixel applies is VLspa, the effective voltage that the above-mentioned liquid crystal layer of above-mentioned second sub-pixel is applied is VLspb, then in four continuous vertical scanning period, it is between above-mentioned first polarity epoch that two vertical scanning period are arranged, two remaining vertical scanning period are between above-mentioned second polarity epoch, between above-mentioned first polarity epoch and in above-mentioned two vertical scanning period of at least one side between above-mentioned second polarity epoch, one of them satisfies | VLspa|〉| VLspb|, another satisfies | VLspa|＜| VLspb|.
In one embodiment, in each pixel of above-mentioned a plurality of pixels, if setting the effective voltage that the above-mentioned liquid crystal layer to above-mentioned first sub-pixel applies is VLspa, the effective voltage that the above-mentioned liquid crystal layer of above-mentioned second sub-pixel is applied is VLspb, then in four continuous vertical scanning period, it is between above-mentioned first polarity epoch that two vertical scanning period are arranged, two remaining vertical scanning period are between above-mentioned second polarity epoch, between above-mentioned first polarity epoch and the V|Lspa| value of a vertical scanning period in above-mentioned two vertical scanning period of at least one side between above-mentioned second polarity epoch and | VLspb| value, respectively with another vertical scanning period | the VLspb| value with | the value of VLspa| equates.
In one embodiment, in above-mentioned four vertical scanning period, satisfy | VLspa|〉| the quantity of the vertical scanning period of VLspb| is with satisfied | VLspa|＜| the quantity of the vertical scanning period of VLspb| equates.
In one embodiment, above-mentioned a plurality of pixels are configured to rectangular on a plurality of line directions and a plurality of column direction, and in each pixel of above-mentioned a plurality of pixels, above-mentioned first sub-pixel and above-mentioned second sub-pixel dispose along above-mentioned column direction.
In one embodiment, in each pixel of above-mentioned a plurality of pixels, the voltage of above-mentioned first pixel electrode and above-mentioned second pixel electrode changes according to the change in voltage of the auxiliary capacitor wiring of correspondence.
In one embodiment, in each pixel of above-mentioned a plurality of pixels, change to different directions with the voltage of the corresponding auxiliary capacitor of above-mentioned first pixel electrode wiring with the voltage of the corresponding auxiliary capacitor wiring of above-mentioned second pixel electrode.
In one embodiment, the voltage of above-mentioned second pixel electrode of a certain pixel in above-mentioned a plurality of pixel and with the voltage of above-mentioned a certain pixel above-mentioned first pixel electrode of adjacent pixels on above-mentioned column direction, change according to the change in voltage of public auxiliary capacitor wiring.
In one embodiment, the voltage of above-mentioned second pixel electrode of a certain pixel in above-mentioned a plurality of pixel and with the voltage of above-mentioned a certain pixel above-mentioned first pixel electrode of adjacent pixels on above-mentioned column direction, change according to the change in voltage of different auxiliary capacitor wirings.
In one embodiment, in each pixel of above-mentioned a plurality of pixels, above-mentioned first pixel electrode is connected to above-mentioned second pixel electrode and same signal wire by the on-off element of correspondence.
In one embodiment, in each pixel of above-mentioned a plurality of pixels, above-mentioned first pixel electrode is connected with first signal wire by first on-off element, and above-mentioned second pixel electrode is connected with the secondary signal line by the second switch element.
In one embodiment, in above-mentioned two vertical scanning period during between above-mentioned first polarity epoch and between above-mentioned second polarity epoch each, one of them is satisfied | VLspa|〉| the vertical scanning period of VLspb|, another is satisfied | VLspa|＜| the vertical scanning period of VLspb|.
In one embodiment, in each pixel of above-mentioned a plurality of pixels, every the counter-rotating of vertical scanning period | VLspa| and | the magnitude relationship of VLspb|, and every the reverse polarity of above-mentioned first sub-pixel and above-mentioned second sub-pixel of two vertical scanning period.
In one embodiment, frame frequency is 60Hz.
In one embodiment, in each pixel of above-mentioned a plurality of pixels, every the counter-rotating of two vertical scanning period | VLspa| and | the magnitude relationship of VLspb|, and every the reverse polarity of above-mentioned first sub-pixel and above-mentioned second sub-pixel of a vertical scanning period.
In one embodiment, frame frequency is 120Hz.
In one embodiment, in each pixel of above-mentioned a plurality of pixels, every the counter-rotating of two vertical scanning period | VLspa| and | the magnitude relationship of VLspb|, and every the reverse polarity of above-mentioned first sub-pixel and above-mentioned second sub-pixel of two vertical scanning period, with different moment in the moment of the reversal of poles of above-mentioned first sub-pixel and above-mentioned second sub-pixel, carry out | VLspa| and | the counter-rotating of the magnitude relationship of VLspb|.
In one embodiment, between above-mentioned first polarity epoch and between above-mentioned second polarity epoch wherein in above-mentioned two vertical scanning period of a side, one of them is satisfied | VLspa|〉| the vertical scanning period of VLspb|, another is satisfied | VLspa|＜| the vertical scanning period of VLspb|, between above-mentioned first polarity epoch and in during each of above-mentioned two vertical scanning period of the opposing party between above-mentioned second polarity epoch, VLspa equates with VLspb.
In one embodiment, the voltage of the auxiliary capacitor corresponding with above-mentioned first pixel electrode and above-mentioned second pixel electrode wiring is higher than between second level of above-mentioned first level and the 3rd level that voltage is higher than above-mentioned second level at first level, voltage and changes.
In one embodiment, above-mentioned first pixel electrode has the display area that equates with above-mentioned second pixel electrode.
According to the present invention, can provide a kind of liquid crystal indicator that suppresses to show the problem generation on the reliabilities such as coarse and burning screen.
Description of drawings
Fig. 1 is the synoptic diagram of expression according to the structure of first embodiment of liquid crystal indicator of the present invention.
Fig. 2 is the schematic block diagram of the liquid crystal panel in the liquid crystal indicator of first embodiment.
Fig. 3 (a) is the floor map of a pixel in the liquid crystal indicator of first embodiment, and Fig. 3 (b) is the diagrammatic cross-section of a sub-pixel.
Fig. 4 is the synoptic diagram that light and shade, polarity and the effective voltage of first, second sub-pixel in the existing liquid crystal indicator of expression changes, (a) be the light and shade of first, second sub-pixel of expression and the synoptic diagram of change in polarity, (b) being that expression is applied to the synoptic diagram that the effective voltage on the liquid crystal layer of first sub-pixel changes, (c) is that expression is applied to the synoptic diagram that the effective voltage on the liquid crystal layer of second sub-pixel changes.
Fig. 5 is the synoptic diagram that light and shade, polarity and the effective voltage of first, second sub-pixel in another existing liquid crystal indicator of expression changes, (a) be the light and shade of first, second sub-pixel of expression and the synoptic diagram of change in polarity, (b) being that expression is applied to the synoptic diagram that the effective voltage on the liquid crystal layer of first sub-pixel changes, (c) is that expression is applied to the synoptic diagram that the effective voltage on the liquid crystal layer of second sub-pixel changes.
Fig. 6 is the light and shade, polarity of first, second sub-pixel in the liquid crystal indicator of expression first embodiment and the synoptic diagram that effective voltage changes, (a) be the light and shade of first, second sub-pixel of expression and the synoptic diagram of change in polarity, (b) being that expression is applied to the synoptic diagram that the effective voltage on the liquid crystal layer of first sub-pixel changes, (c) is that expression is applied to the synoptic diagram that the effective voltage on the liquid crystal layer of second sub-pixel changes.
Fig. 7 is the synoptic diagram of an example of pixel structure of the liquid crystal indicator of expression first embodiment.
Fig. 8 is the equivalent circuit diagram of a pixel in the liquid crystal indicator of first embodiment.
Fig. 9 is the figure of an example of the various voltage waveforms that use in the driving of liquid crystal indicator of expression first embodiment.
Figure 10 is the figure of the effective voltage relation that applies on the liquid crystal layer of sub-pixel in the liquid crystal indicator of expression first embodiment.
Figure 11 is the figure of γ characteristic of the liquid crystal indicator of expression first embodiment, (a) is the figures of expression with the γ characteristic at right 60 degree visual angles, (b) is the figures of expression with the γ characteristic at upper right 60 degree visual angles.
Figure 12 is the figure of an example of the various voltage waveforms in a plurality of vertical scanning period in the liquid crystal indicator of expression first embodiment.
Figure 13 is the example of equivalent circuit diagram of the liquid crystal indicator of first embodiment.
Figure 14 is the synoptic diagram of arrangement, light and shade and polarity of a plurality of sub-pixels in the liquid crystal indicator of expression first embodiment.
Figure 15 is the figure of an example of the various voltage waveforms in the liquid crystal indicator of expression first embodiment.
Figure 16 is the figure of an example of the various voltage waveforms in a plurality of vertical scanning period in the liquid crystal indicator of expression first embodiment.
Figure 17 is the synoptic diagram of the variation of the light and shade of sub-pixel in the liquid crystal indicator of expression first embodiment and polarity and the auxiliary capacitor voltage that begins in the vertical scanning period of each sub-pixel.
Figure 18 (a) and (b) be the figure of an example of the various voltage waveforms in a plurality of vertical scanning period in the liquid crystal indicator of expression first embodiment.
Figure 19 (a)～(c) is the figure of an example of the various voltage waveforms in a plurality of vertical scanning period in the liquid crystal indicator of expression first embodiment.
Figure 20 is the figure of an example of the various voltage waveforms in a plurality of vertical scanning period in the liquid crystal indicator of expression first embodiment.
Figure 21 is the figure of an example of the various voltage waveforms in a plurality of vertical scanning period in the liquid crystal indicator of expression first embodiment.
Figure 22 is the synoptic diagram of the variation of the light and shade of sub-pixel in the liquid crystal indicator of expression first embodiment and polarity and the auxiliary capacitor voltage that begins in the vertical scanning period of each sub-pixel.
Figure 23 is the example of equivalent circuit diagram of the liquid crystal indicator of first embodiment.
Figure 24 is the figure of an example of the various voltage waveforms in the liquid crystal indicator of expression first embodiment.
Figure 25 is the synoptic diagram of an example of pixel structure of the liquid crystal indicator of expression first embodiment.
Figure 26 is the synoptic diagram of expression according to light and shade, polarity and the effective voltage variation of first, second sub-pixel in second embodiment of liquid crystal indicator of the present invention, (a) be the light and shade of first, second sub-pixel of expression and the synoptic diagram of change in polarity, (b) being that expression is applied to the synoptic diagram that the effective voltage on the liquid crystal layer of first sub-pixel changes, (c) is that expression is applied to the synoptic diagram that the effective voltage on the liquid crystal layer of second sub-pixel changes.
Figure 27 is the synoptic diagram of the variation of the light and shade of sub-pixel in the liquid crystal indicator of expression second embodiment and polarity and the auxiliary capacitor voltage that begins in the vertical scanning period of each sub-pixel.
Figure 28 is the synoptic diagram of expression according to light and shade, polarity and the effective voltage variation of first, second sub-pixel in the 3rd embodiment of liquid crystal indicator of the present invention, (a) be the light and shade of first, second sub-pixel of expression and the synoptic diagram of change in polarity, (b) being that expression is applied to the synoptic diagram that the effective voltage on the liquid crystal layer of first sub-pixel changes, (c) is that expression is applied to the synoptic diagram that the effective voltage on the liquid crystal layer of second sub-pixel changes.
Figure 29 is the figure of an example of the various voltage waveforms in the liquid crystal indicator of expression the 3rd embodiment.
Figure 30 is the synoptic diagram of the variation of the light and shade of sub-pixel in the liquid crystal indicator of expression the 3rd embodiment and polarity and the auxiliary capacitor voltage that begins in the vertical scanning period of each sub-pixel.
Figure 31 is the synoptic diagram of expression according to light and shade, polarity and the effective voltage variation of first, second sub-pixel in the 4th embodiment of liquid crystal indicator of the present invention, (a) be the light and shade of first, second sub-pixel of expression and the synoptic diagram of change in polarity, (b) being that expression is applied to the synoptic diagram that the effective voltage on the liquid crystal layer of first sub-pixel changes, (c) is that expression is applied to the synoptic diagram that the effective voltage on the liquid crystal layer of second sub-pixel changes.
Figure 32 is the synoptic diagram of the variation of the light and shade of sub-pixel in the liquid crystal indicator of expression the 4th embodiment and polarity and the auxiliary capacitor voltage that begins in the vertical scanning period of each sub-pixel.
Figure 33 is the synoptic diagram of expression according to light and shade, polarity and the effective voltage variation of first, second sub-pixel in the 5th embodiment of liquid crystal indicator of the present invention, (a) be the light and shade of first, second sub-pixel of expression and the synoptic diagram of change in polarity, (b) being that expression is applied to the synoptic diagram that the effective voltage on the liquid crystal layer of first sub-pixel changes, (c) is that expression is applied to the synoptic diagram that the effective voltage on the liquid crystal layer of second sub-pixel changes.
Figure 34 is the figure of an example of the various voltage waveforms in the liquid crystal indicator of expression the 5th embodiment.
Figure 35 is the synoptic diagram of the variation of the light and shade of sub-pixel in the liquid crystal indicator of expression the 5th embodiment and polarity and the auxiliary capacitor voltage that begins in the vertical scanning period of each sub-pixel.
Figure 36 is the synoptic diagram of expression according to light and shade, polarity and the effective voltage variation of first, second sub-pixel in the 6th embodiment of liquid crystal indicator of the present invention, (a) be the light and shade of first, second sub-pixel of expression and the synoptic diagram of change in polarity, (b) being that expression is applied to the synoptic diagram that the effective voltage on the liquid crystal layer of first sub-pixel changes, (c) is that expression is applied to the synoptic diagram that the effective voltage on the liquid crystal layer of second sub-pixel changes.
Figure 37 is the synoptic diagram of the variation of the light and shade of sub-pixel in the liquid crystal indicator of expression the 6th embodiment and polarity and the auxiliary capacitor voltage that begins in the vertical scanning period of each sub-pixel.
Figure 38 is the synoptic diagram of expression according to light and shade, polarity and the effective voltage variation of first, second sub-pixel in the 7th embodiment of liquid crystal indicator of the present invention, (a) be the light and shade of first, second sub-pixel of expression and the synoptic diagram of change in polarity, (b) being that expression is applied to the synoptic diagram that the effective voltage on the liquid crystal layer of first sub-pixel changes, (c) is that expression is applied to the synoptic diagram that the effective voltage on the liquid crystal layer of second sub-pixel changes.
Figure 39 A is the synoptic diagram of the variation of the light and shade of sub-pixel in a certain frame of liquid crystal indicator of expression the 7th embodiment and polarity and the auxiliary capacitor voltage that begins in the vertical scanning period of each sub-pixel.
Figure 39 B is the synoptic diagram of the variation of the light and shade of sub-pixel in the next frame of liquid crystal indicator of expression the 7th embodiment and polarity and the auxiliary capacitor voltage that begins in the vertical scanning period of each sub-pixel.
Figure 40 is the figure of an example of the various voltage waveforms in the liquid crystal indicator of expression the 7th embodiment.
Label declaration
10 pixels
10a, 10b sub-pixel
13 liquid crystal layers
17 comparative electrodes
18a, 18b pixel electrode
100 liquid crystal indicators
The 100A liquid crystal panel
Embodiment
Below, with reference to accompanying drawing, first embodiment according to liquid crystal indicator of the present invention is described.
At first, with reference to Fig. 1～Fig. 3, the structure of the liquid crystal indicator 100 of brief description present embodiment.Among Fig. 1, the liquid crystal indicator 100 of expression present embodiment.The liquid crystal panel 100A of liquid crystal indicator 100 comprises as shown in Figure 2: have the display part 110 that is arranged in rectangular a plurality of pixels on a plurality of line directions and column direction; And the driving circuit 120 that drives display part 110.Each pixel of display part 110 comprises liquid crystal layer and liquid crystal layer is applied a plurality of electrodes of voltage.Driving circuit 120 generates drive signal according to the received image signal of being imported.
Fig. 3 (a) is the floor map of the electrode structure of a pixel, and Fig. 3 (b) is the diagrammatic cross-section of a sub-pixel.Fig. 3 (b) is equivalent to along the section of the 3B-3B ' line of Fig. 3 (a).Shown in Fig. 3 (a), a pixel 10 has the first sub-pixel 10a and the second sub-pixel 10b that disposes like that along column direction.Shown in Fig. 3 (b), the first sub-pixel 10a have liquid crystal layer 13, the first pixel electrode 18a with across liquid crystal layer 13 comparative electrode 17 relative with the first pixel electrode 18a.In addition, represented the structure of the first sub-pixel 10a among Fig. 3 (b), and the second sub-pixel 10b also has identical structure.About comparative electrode 17, be typically an electrode public to all pixels 10.In the liquid crystal indicator 100 of present embodiment, can apply different voltage to the first pixel electrode 18a and the second pixel electrode 18b, thus, can make the effective voltage of the liquid crystal layer of the first sub-pixel 10a be different from the effective voltage of the liquid crystal layer of the second sub-pixel 10b.
Then, with reference to Fig. 4～Fig. 6, on one side with the liquid crystal indicator of patent documentation 1 and patent documentation 2 relatively, the light and shade of the sub-pixel in the liquid crystal indicator 100 of present embodiment and the variation of direction of an electric field (direction of line of electric force) are described on one side.Here, for the purpose of simplifying the description, suppose that pixel shows predetermined middle gray at number in image duration.
The variation of the effective voltage that applies on the liquid crystal layer of the variation of the light and shade of the sub-pixel in the liquid crystal indicator of patent documentation 1 and direction of an electric field and first and second sub-pixels at first, is described with reference to Fig. 4.Among Fig. 4 (a), during 1～6 expression, represent vertical scanning period during each.In addition, " vertical scanning period " is defined as: from select in order to write shows signal voltage a certain sweep trace, to select in order to write next shows signal voltage till this sweep trace during.In addition, will be line by line (Noninterlace) when driving the received image signal of usefulness an image duration and interlacing (Interlace) drive usefulness received image signal the time a field interval be called " vertical scanning period of received image signal ".Usually, a vertical scanning period in the liquid crystal indicator is corresponding to a vertical scanning period of received image signal.Below, for simplicity, a vertical scanning period of liquid crystal panel and a situation that vertical scanning period is corresponding of received image signal are described, but the invention is not restricted to this, (for example for example also go for a vertical scanning period of received image signal, 1/60 second) be divided into liquid crystal panel two vertical scanning period (for example, 2 * 1/120 seconds), be that so-called twice speed drives (vertical scanning frequency is 120Hz) etc.In addition, establish the equal in length of each vertical scanning period here.In addition, in each vertical scanning period, with select a certain sweep trace the moment, with the moment of selecting next bar sweep trace poor (during) be called a horizontal scan period (1H).
Among Fig. 4 (a), the rectangle of upside and downside is respectively first and second sub-pixels, and in first sub-pixel and second sub-pixel, the higher sub-pixel of brightness represents that with white the lower sub-pixel of brightness is represented with black.In addition, among Fig. 4 (a), "+", "-" expression offers comparative electrode when selected with corresponding sweep trace common electric voltage is the polarity of the shows signal voltage of benchmark.Here, the current potential of "+" expression first pixel electrode and second pixel electrode is higher than the current potential of comparative electrode, and electric field is from the side of pixel electrode side towards comparative electrode.On the other hand, the current potential of "-" expression first pixel electrode and second pixel electrode is lower than the current potential of comparative electrode, and electric field is from the side of comparative electrode side towards pixel electrode.In the following description, "+" is also referred to as first polarity, "-" is also referred to as second polarity, "+" and "-" also is generically and collectively referred to as polarity.In addition, will become "+" during be also referred to as between first polarity epoch, will become "-" during be also referred to as between second polarity epoch,
In the liquid crystal indicator of patent documentation 1, shown in Fig. 4 (a), during 1,3,5 be between first polarity epoch, during 2,4,6 be that polarity is reversed every vertical scanning period between second polarity epoch.In addition, shown in Fig. 4 (a), in the liquid crystal indicator of patent documentation 1, during all in 1～6 the brightness of first sub-pixel all be higher than the brightness of second sub-pixel.
The effective voltage VLspa, the VLspb that represent each vertical scanning period of on the liquid crystal layer of first, second sub-pixel, applying in the liquid crystal indicator of patent documentation 1 among Fig. 4 (b) and Fig. 4 (c) respectively with thick line.The effective value of the difference of the voltage Vc of the effective voltage VLspa that applies on the liquid crystal layer of first, second sub-pixel, the voltage that VLspb is first, second pixel electrode and comparative electrode represents that here the voltage Vc of comparative electrode fixes.In addition, though not special expression among Fig. 4 (b) and Fig. 4 (c), but also can as disclosing, patent documentation 1, the voltage that applies on the liquid crystal layer of first, second sub-pixel be changed in same vertical scanning period by changing the voltage of auxiliary capacitor wiring.
During in 1, the voltage of first pixel electrode and second pixel electrode all is higher than the voltage of comparative electrode, in addition, the absolute value of the effective voltage that also applies on the liquid crystal layer greater than second sub-pixel of the absolute value of the effective voltage that applies on the liquid crystal layer of first sub-pixel (| VLspa|〉| VLspb|).Thereby, shown in Fig. 4 (a), during 1 be between first polarity epoch, first sub-pixel is brighter than second sub-pixel.From during 1 to during 2 when shifting, the effective voltage VLspa, the VLspb that apply on the liquid crystal layer of first sub-pixel and second sub-pixel change.During in 2, the voltage of first pixel electrode and second pixel electrode all is lower than the voltage of comparative electrode.In addition, the absolute value of the effective voltage that applies on the liquid crystal layer of absolute value greater than second sub-pixel of the effective voltage that applies on the liquid crystal layer of first sub-pixel (| VLspa|〉| VLspb|).Thereby, shown in Fig. 4 (a), during 2 be between second polarity epoch, first sub-pixel is brighter than second sub-pixel.
From during 3, during the light and shade of first, second sub-pixel and polarity repeat 1 and during the light and shade and the polarity of first, second sub-pixel in 2.In the liquid crystal indicator of patent documentation 1, shown in Fig. 4 (a), the brightness of first sub-pixel is higher than the brightness of second sub-pixel always, therefore can find out the sub-pixel light and shade and show coarse.
Then, with reference to Fig. 5, the variation of the effective voltage that applies on the liquid crystal layer of the variation of the light and shade of the sub-pixel in the liquid crystal indicator of patent documentation 2 and direction of an electric field and first and second sub-pixels is described.
Shown in Fig. 5 (a), in the liquid crystal indicator of patent documentation 2,1,3,5 be between first polarity epoch during also being, during 2,4,6 be that polarity is reversed every vertical scanning period between second polarity epoch.In addition, in the liquid crystal indicator of patent documentation 2, during in 1,3,5, the brightness of first sub-pixel is higher than the brightness of second sub-pixel, during in 2,4,6, the brightness of second sub-pixel is higher than the brightness of first sub-pixel.
Be illustrated in effective voltage VLspa, the VLspb of each vertical scanning period that applies on the liquid crystal layer of first, second sub-pixel among Fig. 5 (b) and Fig. 5 (c) respectively with thick line.In addition, though not special expression among Fig. 5 (b) and Fig. 5 (c), but also can as disclosing, patent documentation 1, the voltage that applies on the liquid crystal layer of first, second sub-pixel be changed in same vertical scanning period by changing the voltage of auxiliary capacitor wiring.
During in 1, the voltage of first pixel electrode and second pixel electrode all is higher than the voltage of comparative electrode.In addition, the absolute value of the effective voltage that also applies on the liquid crystal layer greater than second sub-pixel of the absolute value of the effective voltage that applies on the liquid crystal layer of first sub-pixel (| VLspa|〉| VLspb|).Thereby, shown in Fig. 5 (a), during 1 be between first polarity epoch, first sub-pixel is brighter than second sub-pixel.From during 1 to during 2 when shifting, effective voltage VLspa, the VLspb of the liquid crystal layer of first, second sub-pixel change.During in 2, the voltage of first pixel electrode and second pixel electrode all is lower than the voltage of comparative electrode.In addition, the absolute value of the effective voltage that applies on the liquid crystal layer of absolute value greater than first sub-pixel of the effective voltage that applies on the liquid crystal layer of second sub-pixel (| VLspa|＜| VLspb|).Thereby, shown in Fig. 5 (a), during 2 be between second polarity epoch, and second sub-pixel is brighter than first sub-pixel.
From during 3, during the light and shade of first, second sub-pixel and polarity repeat 1 and during the light and shade and the polarity of first, second sub-pixel in 2.In the liquid crystal indicator of patent documentation 2, because every the vertical scanning period reversed polarity, and light and shade every vertical scanning period inverted rotor pixel, therefore different with the liquid crystal indicator of patent documentation 1, exist first sub-pixel and second sub-pixel separately than other bright during, as a result, can suppress to show coarse.Yet, in the liquid crystal indicator of patent documentation 2, since first sub-pixel than second sub-pixel bright during be between first polarity epoch always, and second sub-pixel than first sub-pixel bright during be between second polarity epoch always, therefore as can be known from Fig. 5 (b) and Fig. 5 (c), in a plurality of vertical scanning period (for example, during this time 1～4) mean value of the effective voltage VLspa of the liquid crystal layer of first sub-pixel is higher than the voltage Vc of comparative electrode in, the mean value of the effective voltage VLspb of the liquid crystal layer of second sub-pixel is lower than the voltage Vc of comparative electrode in a plurality of vertical scanning period (for example, 1～4).Thereby in the liquid crystal indicator of patent documentation 2, residual in each sub-pixel have DC component (DC level) biasing, because this biasing produces the problem on the reliabilities such as burning screen.
Then, with reference to Fig. 6, the variation of the effective voltage that applies on the liquid crystal layer of the variation of the light and shade of the sub-pixel in the liquid crystal indicator 100 of present embodiment and direction of an electric field and first and second sub-pixels is described.
Shown in Fig. 6 (a), in the liquid crystal indicator 100 of present embodiment, during 1,2,5,6 be between first polarity epoch, during 3,4 be between second polarity epoch.In addition, as mentioned above, between first polarity epoch be the voltage of first, second pixel electrode voltage that is higher than comparative electrode during, between second polarity epoch be the voltage of first, second pixel electrode voltage that is lower than comparative electrode during.Here,, then in four vertical scanning period, have two to be between first polarity epoch, and remaining two be between second polarity epoch if see four continuous vertical scanning period.For example, among Fig. 6 (a) during 1～4, during 1 and during 2 be between first polarity epoch, during 3 and during 4 be between second polarity epoch.
The effective voltage VLspa, the VLspb that represent each vertical scanning period of applying on the liquid crystal layer of first, second sub-pixel among Fig. 6 (b) and Fig. 6 (c) respectively with thick line.In addition, in the present embodiment, also can with patent documentation 1 and patent documentation 2 disclosed identical, by changing the voltage of auxiliary capacitor wiring, the voltage that applies on the liquid crystal layer of first, second sub-pixel is changed in same vertical scanning period.In addition, expression among Fig. 6 (b) and Fig. 6 (c), owing to be benchmark with the voltage Vc of comparative electrode, so the voltage Vc of comparative electrode is irrelevant but fix with the time, but the voltage Vc of comparative electrode also can time to time change.
During in 1, the voltage of first pixel electrode and second pixel electrode all is higher than the voltage of comparative electrode.In addition, the absolute value of the effective voltage that also applies on the liquid crystal layer greater than second sub-pixel of the absolute value of the effective voltage that applies on the liquid crystal layer of first sub-pixel (| VLspa|〉| VLspb|).Thereby, shown in Fig. 6 (a), during 1 be between first polarity epoch, first sub-pixel is brighter than second sub-pixel.
From during 1 to during 2 when shifting, effective voltage VLspa, the VLspb of the liquid crystal layer of first, second sub-pixel change.During in 2, the voltage of first pixel electrode and second pixel electrode all is higher than the voltage of comparative electrode.In addition, the absolute value of the effective voltage that applies on the liquid crystal layer of absolute value greater than first sub-pixel of the effective voltage that applies on the liquid crystal layer of second sub-pixel (| VLspa|＜| VLspb|).Thereby, shown in Fig. 6 (a), during 2 be between first polarity epoch, and second sub-pixel is brighter than first sub-pixel.
During in 3, the voltage of first pixel electrode and second pixel electrode all is lower than the voltage of comparative electrode.In addition, the absolute value of the effective voltage that applies on the liquid crystal layer of absolute value greater than second sub-pixel of the effective voltage that applies on the liquid crystal layer of first sub-pixel (| VLspa|〉| VLspb|).Thereby, shown in Fig. 6 (a), during 3 be between second polarity epoch, first sub-pixel is brighter than second sub-pixel.
During in 4, the voltage of first pixel electrode and second pixel electrode all is lower than the voltage of comparative electrode.In addition, the absolute value of the effective voltage that applies on the liquid crystal layer of absolute value greater than first sub-pixel of the effective voltage that applies on the liquid crystal layer of second sub-pixel (| VLspa|＜| VLspb|).Thereby, shown in Fig. 6 (a), during 4 be between second polarity epoch, second sub-pixel is brighter than first sub-pixel.Below, from during 5, the light and shade and the polarity of first, second sub-pixel during the light and shade of first, second sub-pixel and polarity repeat in 1～4.
As mentioned above, in the liquid crystal indicator 100 of present embodiment, it is between first polarity epoch that two vertical scanning period are arranged in continuous four vertical scanning period.Wherein, one is satisfied | VLspa|〉| the vertical scanning period of VLspb| (for example 1), another is satisfied | VLspa|＜| the vertical scanning period of VLspb| (for example 2).In addition, two remaining vertical scanning period are between second polarity epoch in continuous four vertical scanning period.Wherein, one is satisfied | VLspa|〉| the vertical scanning period of VLspb| (for example 3), another is satisfied | VLspa|＜| the vertical scanning period of VLspb| (for example 4).From Fig. 6 (a) as can be known, in the liquid crystal indicator 100 of present embodiment, light and shade every vertical scanning period inverted rotor pixel, and every two vertical scanning period reversed polarities, (brightness, the polarity) of first sub-pixel changes successively with (bright ,+), (dark ,+), (bright,-), (dark,-), and (brightness, the polarity) of second sub-pixel changes successively with (dark ,+), (bright ,+), (dark,-), (bright,-).Here, " bright " expression is brighter than other sub-pixel, and " secretly " expression is darker than other sub-pixel.Change like this by the effective voltage that makes sub-pixel, make between first polarity epoch and between each polarity epoch between second polarity epoch in, the difference of the mean value of the effective voltage on the mean value that is applied to the effective voltage on the liquid crystal layer of first sub-pixel and the liquid crystal layer that is applied to second sub-pixel is actual to be zero.
In the liquid crystal indicator 100 of present embodiment, be different from the liquid crystal indicator of patent documentation 1,, therefore can suppress to show coarse because the light and shade of sub-pixel is reversed every vertical scanning period.In addition, in the liquid crystal indicator 100 of present embodiment, the liquid crystal indicator that is different from patent documentation 2, since all have between first polarity epoch and between second polarity epoch satisfied (| VLspa|〉| VLspb|) and satisfy (| VLspa|＜| VLspb|), therefore as can be known from Fig. 6 (b) and Fig. 6 (c), in a plurality of vertical scanning period (for example 1～4), can make the mean value of effective voltage VLspa and the mean value of effective voltage VLspb all is zero.In addition, for example, even the mean value of effective voltage VLspa, VLspb is non-vanishing, but since the mean value of the mean value of effective voltage VLspa and effective voltage VLspb about equally, therefore by adjusting relative voltage, also the mean value of effective voltage VLspa, VLspb all can be adjusted into zero.By the mean value that makes effective voltage like this is zero, can the inhibition of sintering screen etc. problem on the reliability take place.In addition, for the liquid crystal layer of first, second sub-pixel being applied the structure of different voltages, can adopt multiple structure for satisfying above-mentioned relation.
In addition, present embodiment preferably is used to adopt the liquid crystal indicator of vertical alignment-type liquid crystal layer, and this vertical alignment-type liquid crystal layer comprises the nematic liquid crystal material with negative dielectric anisotropy.Especially the liquid crystal layer that comprises in each sub-pixel, the azimuth direction that preferably includes liquid crystal molecules tilt when applying voltage differs about 90 ° four farmlands (MVA pattern) each other.Perhaps, the liquid crystal layer that comprises in each sub-pixel also can be to be the liquid crystal layer of rotational symmetry orientation at least when applying voltage.
Below, further describe the liquid crystal indicator 100 of the MVA pattern that adopts present embodiment.
As shown in Figure 1, liquid crystal indicator 100 comprises: liquid crystal panel 100A; Be arranged at phase difference compensating element (being typically the phase difference compensation plate) 20a and the 20b of the both sides of liquid crystal panel 100A; The Polarizer 30a and the 30b that clamp each part mentioned above and dispose; And backlight 40.The axis of homology of Polarizer 30a and 30b (being also referred to as " polarizing axis ") is configured to orthogonal (quadrature Niccol (Cross Nicol) configuration), deceives demonstration under the state (vertical orientated state) that does not apply voltage on the liquid crystal layer 13 (with reference to Fig. 3 (b)) of liquid crystal panel 100A.Therefore, liquid crystal indicator 100 is the liquid crystal indicators of often deceiving pattern (Normally Black Mode).Phase difference compensating element 20a and 20b are provided with in order to make liquid crystal indicator have good angle of visibility characteristic, adopt prior art to carry out optimal design.Specifically implement to optimize, make under the black show state, in that all azimuth directions are oblique when observing and the difference of brightness (shiny black degree) during top view be a minimum.
Shown in Fig. 3 (a), between the first pixel electrode 18a and the second pixel electrode 18b, disposed sweep trace 12.In addition, for first, second pixel electrode 18a and 18b being applied predetermined voltage respectively at predetermined instant, the circuit etc. that on substrate 11a, forms sweep trace 12, signal wire and TFT (not shown among Fig. 3) in the nature of things and drive their usefulness.In addition, on another substrate 11b, color filter etc. is set as required.
Then, on one side with reference to Fig. 3 (a) and Fig. 3 (b), one side illustrates the structure of a pixel in the liquid crystal indicator 100 of MVA pattern.Basic structure and action thereof about the liquid crystal indicator of MVA pattern for example disclose in Japanese patent laid-open 11-242225 communique.
Shown in Fig. 3 (b), among the pixel electrode 18a that on glass substrate 11a, forms groove 18s is set, utilize this pixel electrode 18a and comparative electrode 17, in liquid crystal layer 13, generate oblique electric field.In addition, on the surface of the glass substrate 11b that is provided with comparative electrode 17, be provided with to the side-prominent rib 19 of liquid crystal layer 13 1.Liquid crystal layer 13 is made of the nematic liquid crystal material with negative dielectric anisotropy, the vertical alignment layer (not shown) that utilizes covering comparative electrode 17, rib 19 and pixel electrode 18a and 18b and form becomes the near normal state of orientation when not applying voltage.Utilize the surface (side of inclination) and the above-mentioned oblique electric field of rib 19, vertical orientated liquid crystal molecule is stably fallen down to predetermined direction.
Shown in Fig. 3 (b), rib 19 is towards the centroclinal one-tenth chevron of rib, and liquid crystal molecule is approximately perpendicular to this dip plane and is orientated.Therefore, utilize rib 19 and produce the distribution at the angle of inclination (the formed angle of the major axis of substrate surface and liquid crystal molecule) of liquid crystal molecule.In addition, groove 18s makes the direction of an electric field that liquid crystal layer is applied change regularly.Its result, effect by this rib 19, groove 18s, because the direction of orientation of the liquid crystal molecule when applying electric field is, lower-left upper right, upper left in the direction of arrow shown in Fig. 3 (a), bottom right four direction orientation, therefore can obtain to have the good angle of visibility characteristic of symmetry characteristic up and down.In addition, the rectangle display surface of liquid crystal panel 100A is typically long side direction is configured in left and right directions, and the axis of homology of Polarizer 30a is set at parallel with long side direction.On the other hand, the long side direction of pixel 10 is configured to direction with the long side direction quadrature of liquid crystal panel 100A.
Shown in Fig. 3 (a), preferably adopt following configuration: make the first sub-pixel 10a identical with the area of the second sub-pixel 10b, in each sub-pixel, comprise first rib that extends along first direction and along with first direction second rib that extends of the second direction of quadrature roughly, first rib and second rib in each sub-pixel with respect to the center line balanced configuration parallel with sweep trace 12, and, the configuration of the rib in the configuration of the rib in sub-pixel and the other sub-pixel with respect to the center line symmetry of sweep trace 12 quadratures.By adopting such configuration, because in each sub-pixel, liquid crystal molecule along upper right, upper left, lower-left, bottom right four direction orientation, and, for the whole pixel that comprises first sub-pixel and second sub-pixel, the area on each liquid crystal farmland is actually identical, therefore can obtain to have the good angle of visibility characteristic of symmetry characteristic up and down.This effect is hour very remarkable at elemental area.In addition, preferably adopt the interval of center line parallel in each sub-pixel to equal about 1/2nd structure of the arrangement pitches of sweep trace with sweep trace.
Then, with reference to Fig. 7～Fig. 9, the concrete structure of a pixel 10 in the liquid crystal indicator 100 of present embodiment is described and two sub-pixel 10a comprising in this pixel 10 and the liquid crystal layer of 10b are applied different voltage condition.
As shown in Figure 7, pixel 10 has two sub-pixel 10a and 10b, and pixel electrode 18a, the 18b of sub-pixel 10a, 10b is connected with TFT16a, TFT16b and auxiliary capacitor (CS) 22a, 22b respectively.The gate electrode of TFT16a and TFT16b is connected with sweep trace 12, and source electrode is connected with public (same) signal wire 14. Auxiliary capacitor 22a, 22b are connected with auxiliary capacitor wiring (CS bus) 24a and auxiliary capacitor wiring 24b respectively. Auxiliary capacitor 22a and 22b are formed by following, comprising: the auxiliary capacitance electrode that is electrically connected with pixel electrode 18a and 18b respectively; The auxiliary capacitor comparative electrode that is electrically connected with auxiliary capacitor wiring 24a and 24b; And the insulation course that between them, is provided with (not shown).The auxiliary capacitor comparative electrode of auxiliary capacitor 22a and 22b is independently of one another, can supply with mutually different auxiliary capacitor relative voltage from auxiliary capacitor wiring 24a and 24b respectively.
Among Fig. 8, the equivalent electrical circuit of a pixel 10 in the expression liquid crystal indicator 100.In this equivalence circuit, the liquid crystal layer of each sub-pixel 10a and 10b is expressed as liquid crystal layer 13a and 13b.In addition, the liquid crystal capacitance that will utilize pixel electrode 18a and 18b, liquid crystal layer 13a and 13b and comparative electrode 17 (public to sub-pixel 10a and 10b) to form is expressed as Clca, Clcb.The capacitance of liquid crystal capacitance Clca and Clcb is CLC (V), and the value of CLC (V) depends on the effective voltage (V) that applies on the liquid crystal layer of sub-pixel 10a, 10b.In addition, will be expressed as Ccsa, Ccsb with auxiliary capacitor 22a, the 22b of the liquid crystal capacitance separate connection of each sub-pixel 10a and 10b respectively, its electrostatic capacitance value is same value CCS.
Among the first sub-pixel 10a, electrode separately of liquid crystal capacitance Clca and auxiliary capacitor Ccsa is connected with the drain electrode that plays as the TFT16a of the on-off element function of sub-pixel 10a, another electrode of liquid crystal capacitance Clca is connected with comparative electrode 17, and another electrode of auxiliary capacitor Ccsa is connected with auxiliary capacitor wiring 24a.In addition, among the second sub-pixel 10b, electrode separately of liquid crystal capacitance Clcb and auxiliary capacitor Ccsb is connected with the drain electrode that plays as the TFT16b of the on-off element function of sub-pixel 10b, another electrode of liquid crystal capacitance Clcb is connected with comparative electrode 17, and another electrode of auxiliary capacitor Ccsb is connected with auxiliary capacitor wiring 24b.The gate electrode of TFT16a and TFT16b all is connected with sweep trace 12, and source electrode all is connected with signal wire 14.
Among Fig. 9, schematically illustrate the variation of each voltage in a certain vertical scanning period of liquid crystal indicator 100 usefulness that drive present embodiment.Among Fig. 9, Vs represents the voltage of signal wire 14, and Vcsa represents the voltage of auxiliary capacitor wiring 24a, Vcsb represents the voltage of auxiliary capacitor wiring 24b, Vg represents the voltage of sweep trace 12, and Vlca represents the voltage of the first pixel electrode 18a, and Vlcb represents the voltage of the second pixel electrode 18b.In addition, the dotted line among the figure is represented the voltage COMMON (Vc) of comparative electrode 17.The voltage Vcsa of auxiliary capacitor wiring 24a is in the scope intercycle variation of Vc-Vad～Vc+Vad, and the voltage Vcsb of auxiliary capacitor wiring 24b is also in the scope intercycle variation of Vc-Vad～Vc+Vad.The voltage Vcsb of auxiliary capacitor wiring 24b is and the voltage Vcsa of the auxiliary capacitor wiring 24a waveform of phasic difference 180 degree mutually.
Below, on one side with reference to Fig. 9, the action of equivalent electrical circuit shown in Figure 8 is described on one side.
At moment T1, the voltage Vg of sweep trace 12 becomes VgH from VgL, make TFT16a and TFT16b be conducting state (opening state) simultaneously, to the pixel electrode 18a of sub-pixel 10a, 10b, the voltage Vs of 18b transmission signal line 14, liquid crystal capacitance Clca, the Clcb of sub-pixel 10a, 10b charged.Similarly, also charge from auxiliary capacitor Ccsa, the Ccsb of signal wire 14 to each sub-pixel.
Then, at moment T2, the voltage Vg of sweep trace 12 becomes VgL from VgH, makes TFT16a and TFT16b simultaneously for nonconducting state (off status), liquid crystal capacitance Clca, the Clcb of sub-pixel 10a, 10b, auxiliary capacitor Ccsa, Ccsb all with signal wire 14 electrical isolations.Be right after thereafter, owing to the feedthrough phenomenon that influences such as stray capacitance that TFT16a, TFT16b had produce, making becomes the roughly the same voltage Vd of voltage Vlca, Vlcb reduction of first, second pixel electrode 18a, 18b:
Vlca＝Vs-Vd
Vlcb＝Vs-Vd。
At this moment, voltage Vcsa, the Vcsb of each auxiliary capacitor wiring are:
Vcsa＝Vc-Vad
Vcsb＝Vc+Vad。
At moment T3, the voltage Vcsa of the auxiliary capacitor wiring 24a that is connected with auxiliary capacitor Ccsa increases to Vc+Vad from Vc-Vad, increased the amount of 2 * Vad, the voltage Vcsb of the auxiliary capacitor wiring 24b that is connected with auxiliary capacitor Ccsb is reduced to Vc-Vad from Vc+Vad, has reduced the amount of 2 * Vad.Along with the change in voltage of auxiliary capacitor wiring 24a and 24b, voltage Vlca, the Vlcb of first, second pixel electrode become respectively:
Vlca＝Vs-Vd+2×K×Vad
Vlcb＝Vs-Vd-2×K×Vad。
Here, K=CCS/ (CLC (V)+CCS).
At moment T4, the voltage Vcsa of auxiliary capacitor wiring 24a changes to Vc-Vad from Vc+Vad, and the voltage Vcsb of auxiliary capacitor wiring 24b changes to Vc+Vad from Vc-Vad, has all changed the amount of 2 * Vad, voltage Vlca, the Vlcb of first, second pixel electrode thus, from
Vlca＝Vs-Vd+2×K×Vad
Vlcb＝Vs-Vd-2×K×Vad
Become:
Vlca＝Vs-Vd
Vlcb＝Vs-Vd。
At moment T5, the voltage Vcsa of auxiliary capacitor wiring 24a changes to Vc+Vad from Vc-Vad, and the voltage Vcsb of auxiliary capacitor wiring 24b changes to Vc-Vad from Vc+Vad, has all changed the amount of 2 * Vad, voltage Vlca, the Vlcb of first, second pixel electrode, also from
Vlca＝Vs-Vd
Vlcb＝Vs-Vd
Become:
Vlca＝Vs-Vd+2×K×Vad
Vlcb＝Vs-Vd-2×K×Vad。
Vcsa, Vcsb, Vlca, Vlcb alternately repeat variation among above-mentioned T4, the T5 every the interval of the integral multiple of horizontal scan period 1H.With the recurrence interval of above-mentioned T4, T5 be set at 1 times of 1H, or 2 times, still be multiple more than 3 times or 3 times, as long as suitably set according to the driving method (polar inversion method etc.) and the show state (flicker, demonstration harsh feeling etc.) of liquid crystal indicator.This repeats to last till when pixel next time 10 is rewritten, to time of T1 equivalence till.Thereby the voltage Vlca of first, second pixel electrode, the average voltage of Vlcb are respectively:
Vlca＝Vs-Vd+K×Vad
Vlcb＝Vs-Vd-K×Vad。
Therefore, the effective voltage V1 that applies on liquid crystal layer 13a, the 13b of sub-pixel 10a, 10b (=VLspa), V2 (=VLspb), be respectively voltage poor of the voltage of the poor and second pixel electrode 18b of voltage of the voltage of the first pixel electrode 18a and comparative electrode 17 and comparative electrode 17, promptly
V1＝VLspa＝Vlca-Vcom
V2＝VLspb＝Vlcb-Vcom
That is,
V1＝Vs-Vd+K×Vad-Vc
V2＝Vs-Vd-K×Vad-Vc。
Thereby, the difference Δ V of the effective voltage that applies on the liquid crystal layer 13a of each sub-pixel of sub-pixel 10a and 10b and the 13b (=V1-V2) being: Δ V=2 * K * Vad is (here, K=CCS/ (CLC (V)+CCS)) can apply mutually different voltage to liquid crystal layer 13a and 13b.
Among Figure 10, schematically illustrate V1 in the liquid crystal indicator 100 of present embodiment and the relation of V2.As can be seen from Figure 10, in the liquid crystal indicator 100 of present embodiment, the V1 value is more little, and Δ V value is big more.In addition, why Δ V value changes with V1 or V2, is because the electrostatic capacitance value CLC (V) of liquid crystal capacitance changes with voltage.
The γ characteristic with right 60 degree visual angles of the liquid crystal indicator 100 of Figure 11 (a) expression present embodiment, the γ characteristic with upper right 60 degree visual angles of the liquid crystal indicator 100 of Figure 11 (b) expression present embodiment.Among Figure 11 (a) and Figure 11 (b), in order more also to have represented to sub-pixel 10a, γ characteristic when 10b applies same voltage.From Figure 11 (a) and Figure 11 (b) as can be known, the gamma characteristic of the liquid crystal indicator 100 of present embodiment is compared with the situation that the voltage of two pixel electrodes equates, be the gamma characteristic (γ=2.2) of frontal more, improved the γ characteristic near longitudinal axis value=transverse axis value.As mentioned above, in a vertical scanning period,, can apply different effective voltages to the liquid crystal layer of different subpixel by to change each voltage as shown in Figure 9, thus the γ characteristic can improve from oblique observe the time.
Below, with reference to Figure 12, the variation of voltage in a plurality of vertical scanning period that a pixel 10 to reference Fig. 7 and Fig. 8 explanation applies is described.
Among Figure 12, Vg represents the voltage of sweep trace 12, Vcsa represents the voltage of first auxiliary capacitor wiring 24a, Vcsb represents the voltage of second auxiliary capacitor wiring 24b, VLspa is illustrated in the effective voltage that applies on the liquid crystal layer 13a of the first sub-pixel 10a, and VLspb is illustrated in the effective voltage that applies on the liquid crystal layer 13b of the second sub-pixel 10b.As mentioned above, vertical scanning period select a certain sweep trace rise, during select till this sweep trace next time, represent with V-Total this period among Figure 12.In addition, do not represent the variation of the voltage Vd that the feedthrough phenomenon because of reference Fig. 9 explanation produces among Figure 12.
In addition, voltage Vcsa, the Vcsb of the wiring of first, second auxiliary capacitor have during the demonstration AH and the adjustment period between BH.Voltage Vcsa, the Vcsb of first, second auxiliary capacitor wiring is that one-period carries out cyclical variation with (being 20H here) during a certain among the AH during showing, the adjustment period between among the BH with show during AH during different during (being 36H or 26H here) change one-period.During the demonstration AH and the adjustment period between the BH sum equate with vertical scanning period (V-Total).In addition, here, AH is after the vertical scanning period corresponding with a certain frame begins during the demonstration, when changing, voltage Vcsa, the Vcsb of first, second auxiliary capacitor wiring begin, the adjustment period between BH after the vertical scanning period corresponding with this frame finishes, when voltage Vcsa, the Vcsb of first, second auxiliary capacitor wiring change, finish.In the present embodiment, frame frequency for example is 60Hz.
Among Figure 12, represented the change in voltage in four vertical scanning period.In the following description, four vertical scanning period are called first～the 4th vertical scanning period, AH during the demonstration corresponding with each vertical scanning period, the adjustment period between BH be called first～the 4th show during AH, first～the 4th adjustment period between BH.In addition, here too, if the voltage Vcsa of auxiliary capacitor wiring 24a becomes higher voltage (VcH), then the voltage Vcsb of auxiliary capacitor wiring 24b becomes lower voltage (VcL), on the contrary, if Vcsa becomes lower voltage (VcL), then Vcsb becomes higher voltage (VcH).In addition, the difference of VcH and VcL is with corresponding with reference to 2 * Vad of Fig. 9 explanation.
At the voltage Vcsa of first auxiliary capacitor wiring 24a is that the voltage Vcsb of VcL, second auxiliary capacitor wiring 24b is the moment of VcH, and the voltage Vg of sweep trace 12 becomes VgH from VgL.Along with the voltage Vg of sweep trace 12 becomes VgH, first vertical scanning period begins, and simultaneously first, second pixel electrode 18a, 18b is charged.The voltage Vg of sweep trace 12 be VgH during because the voltage Vs of signal wire 14 is higher than the voltage Vc of comparative electrode 17, therefore the result of charging makes the voltage of win the pixel electrode 18a and the second pixel electrode 18b be higher than the voltage Vc of comparative electrode 17.Then, in case the voltage Vg of sweep trace 12 gets back to VgL once more from VgH, to the just end of charging of first, second pixel electrode 18a, 18b.
Then, the voltage Vcsa of first auxiliary capacitor wiring 24a increases to VcH, and the voltage Vcsb of second auxiliary capacitor wiring 24b is reduced to VcL.Here, the moment that the voltage Vcsa of first auxiliary capacitor wiring 24a increases and the voltage Vcsb of second auxiliary capacitor wiring 24b reduces be first show during moment of beginning of AH.Among the AH, voltage Vcsa, the Vcsb of first, second auxiliary capacitor wiring 24a, 24b increases every 10H or reduces during first shows, and is that one-period carries out cyclical variation with 20H.In case first show during AH finish, the adjustment period of first between BH just begin.Between first the adjustment period among the BH, voltage Vcsa, the Vcsb of first, second auxiliary capacitor wiring 24a, 24b increases at interval or reduces.Owing to the voltage of first, second pixel electrode 18a, 18b along with the voltage Vcsa of first, second auxiliary capacitor wiring 24a, 24b, the variation of Vcsb change, therefore in first vertical scanning period, the absolute value of the effective voltage that applies on the liquid crystal layer 13a of the first sub-pixel 10a is greater than the absolute value of the effective voltage that applies on the liquid crystal layer 13b of the second sub-pixel 10b, and the first sub-pixel 10a is brighter than the second sub-pixel 10b.
Between first the adjustment period among the BH, be that the voltage Vcsb of VcH, second auxiliary capacitor wiring 24b is the moment of VcL at the voltage Vcsa of first auxiliary capacitor wiring 24a, the voltage Vg of sweep trace 12 becomes VgH from VgL.Along with the voltage Vg of sweep trace 12 becomes VgH, first vertical scanning period finishes, and second vertical scanning period begins, and simultaneously first, second pixel electrode 18a, 18b is charged.The voltage Vg of sweep trace 12 be VgH during because the voltage Vs of signal wire 14 is higher than the voltage Vc of comparative electrode 17, therefore the result of charging makes the voltage of win the pixel electrode 18a and the second pixel electrode 18b be higher than the voltage Vc of comparative electrode 17.Then, in case the voltage Vg of sweep trace 12 gets back to VgL once more from VgH, to the just end of charging of first, second pixel electrode 18a, 18b.
Then, the voltage Vcsa of first auxiliary capacitor wiring 24a is reduced to VcL, and the voltage Vcsb of second auxiliary capacitor wiring 24b increases to VcH.Reduce and the voltage Vcsb of second auxiliary capacitor wiring 24b when increasing at the voltage Vcsa of first auxiliary capacitor wiring 24a, finish between the adjustment period of first, second show during AH begin.During second shows among the AH too, voltage Vcsa, the Vcsb of first, second auxiliary capacitor wiring 24a, 24b increases every 10H or reduces, and be that one-period carries out cyclical variation with 20H, between second the adjustment period among the BH, voltage Vcsa, the Vcsb of first, second auxiliary capacitor wiring 24a, 24b increases at interval or reduces.Owing to the voltage of first, second pixel electrode 18a, 18b along with the voltage Vcsa of first, second auxiliary capacitor wiring 24a, 24b, the variation of Vcsb change, therefore in second vertical scanning period, the absolute value of the effective voltage that applies on the liquid crystal layer 13b of the second sub-pixel 10b is greater than the absolute value of the effective voltage that applies on the liquid crystal layer 13a of the first sub-pixel 10a, and the second sub-pixel 10b is brighter than the first sub-pixel 10a.
Then, second the adjustment period between among the BH, be that the voltage Vcsb of VcH, second auxiliary capacitor wiring 24b is the moment of VcL at the voltage Vcsa of first auxiliary capacitor wiring 24a, the voltage Vg of sweep trace 12 becomes VgH from VgL.Along with the voltage Vg of sweep trace 12 becomes VgH, second vertical scanning period finishes, and the 3rd vertical scanning period begins, and simultaneously first, second pixel electrode 18a, 18b is charged.The voltage Vg of sweep trace 12 be VgH during because the voltage Vs of signal wire 14 is lower than the voltage Vc of comparative electrode 17, therefore the result of charging makes the voltage of win the pixel electrode 18a and the second pixel electrode 18b be lower than the voltage Vc of comparative electrode 17.Then, in case the voltage Vg of sweep trace 12 gets back to VgL once more from VgH, to the just end of charging of first, second pixel electrode 18a, 18b.
Then, the voltage Vcsa of first auxiliary capacitor wiring 24a is reduced to VcL, and the voltage Vcsb of second auxiliary capacitor wiring 24b increases to VcH.Reduce and the voltage Vcsb of second auxiliary capacitor wiring 24b when increasing at the voltage Vcsa of first auxiliary capacitor wiring 24a, the adjustment period of second between BH finish, the 3rd show during AH begin.During the 3rd shows among the AH, voltage Vcsa, the Vcsb of first, second auxiliary capacitor wiring 24a, 24b increases every 10H or reduces, and be that one-period carries out cyclical variation with 20H, between the 3rd the adjustment period among the BH, voltage Vcsa, the Vcsb of first, second auxiliary capacitor wiring 24a, 24b increases at interval or reduces.Owing to the voltage of first, second pixel electrode 18a, 18b along with the voltage Vcsa of first, second auxiliary capacitor wiring 24a, 24b, the variation of Vcsb change, therefore in the 3rd vertical scanning period, the absolute value of the effective voltage that applies on the liquid crystal layer 13a of the first sub-pixel 10a is greater than the absolute value of the effective voltage that applies on the liquid crystal layer 13b of the second sub-pixel 10b, and the first sub-pixel 10a is brighter than the second sub-pixel 10b.
Then, the 3rd the adjustment period between among the BH, be that the voltage Vcsb of VcL, second auxiliary capacitor wiring 24b is the moment of VcH at the voltage Vcsa of first auxiliary capacitor wiring 24a, the voltage Vg of sweep trace 12 becomes VgH from VgL.Along with the voltage Vg of sweep trace 12 becomes VgH, the 3rd vertical scanning period finishes, and the 4th vertical scanning period begins, and simultaneously first, second pixel electrode 18a, 18b is charged.The voltage Vg of sweep trace 12 be VgH during because the voltage Vs of signal wire 14 is lower than the voltage Vc of comparative electrode 17, therefore the result of charging makes the voltage of win the pixel electrode 18a and the second pixel electrode 18b be lower than the voltage Vc of comparative electrode 17.Then, in case the voltage Vg of sweep trace 12 gets back to VgL once more from VgH, to the just end of charging of first, second pixel electrode 18a, 18b.
Then, the voltage Vcsa of first auxiliary capacitor wiring 24a increases to VcH, and the voltage Vcsb of second auxiliary capacitor wiring 24b is reduced to VcL.Increase and the voltage Vcsb of second auxiliary capacitor wiring 24b when reducing at the voltage Vcsa of first auxiliary capacitor wiring 24a, the adjustment period of the 3rd between BH finish, the 4th show during AH begin.During the 4th shows among the AH, voltage Vcsa, the Vcsb of first, second auxiliary capacitor wiring 24a, 24b increases every 10H or reduces, and be that one-period carries out cyclical variation with 20H, between the 4th the adjustment period among the BH, voltage Vcsa, the Vcsb of first, second auxiliary capacitor wiring 24a, 24b increases at interval or reduces.Owing to the voltage of first, second pixel electrode 18a, 18b along with the voltage Vcsa of first, second auxiliary capacitor wiring 24a, 24b, the variation of Vcsb change, therefore in the 4th vertical scanning period, the absolute value of the effective voltage that applies on the liquid crystal layer 13b of the second sub-pixel 10b is greater than the absolute value of the effective voltage that applies on the liquid crystal layer 13a of the first sub-pixel 10a, and the second sub-pixel 10b is brighter than the first sub-pixel 10a.Since the 5th vertical scanning period, each voltage and first～the 4th vertical scanning period shown in Figure 12 similarly change.
As mentioned above, (light and shade, the polarity) of first sub-pixel changes successively with (bright ,+), (dark ,+), (bright,-), (dark,-), and (light and shade, the polarity) of second sub-pixel change successively with (dark ,+), (bright ,+), (dark,-), (bright,-), and the light and shade of first and second sub-pixels and polarity change shown in Fig. 6 (a) like that.Like this, by changing voltage Vcsa, the Vcsb of first, second auxiliary capacitor wiring, in the liquid crystal indicator of the angle of visibility interdependence that has improved the γ characteristic, can suppress the reduction of display quality.
In addition, as above-mentioned illustrated, in the liquid crystal indicator of present embodiment, set the current potential magnitude relationship of pixel electrode and comparative electrode and reverse at regular intervals, the direction of an electric field that liquid crystal layer is applied reverses at regular intervals.In this case, in the typical liquid crystal indicator that comparative electrode and pixel electrode is arranged on the different substrate, the direction of an electric field that liquid crystal layer is applied is to reverse to observer's side with from observer's lateral light source from light source side.As mentioned above, the voltage method that is set at alternating voltage is called " AC driving method ".In the liquid crystal indicator of present embodiment, the returing cycle of the direction of an electric field that liquid crystal layer is applied is two image durations (for example 33.333ms) 2 times (for example 66.667ms).That is to say, in the liquid crystal indicator of present embodiment, just make the direction of an electric field that liquid crystal layer is applied reverse every two two field pictures that show.Thereby, under the situation that shows rest image, if the electric field intensity (applying voltage) of each direction of an electric field is not correct unanimity, is that every change direction of an electric field, electric field intensity just change that then the brightness of pixel changes with the variation of electric field intensity, thereby produces the problem that shows flicker.
In order to prevent this flicker, must make the electric field intensity (applying voltage) of each direction of an electric field correctly consistent.Yet, in the industrial liquid crystal indicator, owing to be difficult to make the electric field intensity of each direction of an electric field correctly consistent, therefore by in the viewing area, making pixel disposed adjacent with mutually different direction of an electric field, utilize pixel intensity equalization effect spatially, reduce flicker.This method is commonly referred to as " some counter-rotating " or " row counter-rotating ".In addition, in these " inversion driving ", the pixel period of counter-rotating is not limited to the form (1 counter-rotating) of counter-rotating (reaching the reversal of poles every row in every line) of the checkerboard type of a pixel unit or the form (1 row counter-rotating) of the counter-rotating (counter-rotating in every line) of delegation's shape, also have every two row and every a reversal of poles that is listed as various states such as (the one row point counter-rotatings of two row), can suitably set as required.
As known from the above, in order to prevent flicker, preferably satisfy three conditions shown below.
First condition is to make that to go up the absolute value of the effective voltage that liquid crystal layer is applied at each direction of an electric field (respectively applying the polarity of voltage) consistent as far as possible.That is, identical with the situation of problem on the above-mentioned reliability, make the average voltage that liquid crystal layer is applied as much as possible near zero.
Second condition is the different pixel of direction of an electric field that disposed adjacent applies in each image duration, to liquid crystal layer.
The 3rd condition is to dispose the sub-pixel brighter than other sub-pixel in same frame as far as possible disorderly.Preferably on showing be to be checkerboard with the subpixel configuration brighter exactly in other words than the bright subpixel configuration of other sub-pixel for non-conterminous on column direction and line direction each other than other sub-pixel.
Below, illustrate that the liquid crystal indicator of present embodiment satisfies above-mentioned three conditions.Before specifying satisfied three conditions,, illustrate that the liquid crystal indicator 100 of present embodiment has the pixel arrangement that is suitable for 1 inversion driving of satisfying above-mentioned condition with reference to Figure 13 and Figure 14.
Among Figure 13, the equivalent electrical circuit of expression liquid crystal indicator 100.Among Figure 13, each pixel has Fig. 7 and structure shown in Figure 8.Pixel arrangement is rectangular, in the following description, the capable m row of n pixel is expressed as pixel n-m, and two sub-pixels that comprise among the pixel n-m are expressed as sub-pixel n-m-A, n-m-B.
Be provided with 10 auxiliary capacitor branch line CS1～CS10 in the liquid crystal indicator 100, each sub-pixel is by some connection the among auxiliary capacitor wiring (CS bus) and the auxiliary capacitor branch line CS1～CS10.For example, sub-pixel 1-a-B, the 1-b-B of the auxiliary capacitor branch line CS2 and first pixel column, 1-c-B ... sub-pixel 2-a-A, 2-b-A, 2-c-A with second pixel column ... connect, the sub-pixel that comprises in a certain sub-pixel and another pixel adjacent with this sub-pixel is by same auxiliary capacitor wiring and be connected with same auxiliary capacitor branch line.
Here, first, second sub-pixel 1-a-A that comprises among the pixel 1-a that is determined by sweep trace G1 and signal wire Sa, the structure of 1-a-B are described.First, second sub-pixel 1-a-A, 1-a-B comprise: liquid crystal capacitance CLC1-a-A and CLC1-a-B; And auxiliary capacitor CCS1-a-A and CCS1-a-B.Liquid crystal capacitance is made of pixel electrode, comparative electrode ComLC and the liquid crystal layer that is provided with between them, and auxiliary capacitor is made of auxiliary capacitance electrode, dielectric film and auxiliary capacitor comparative electrode (ComCS1, ComCS2).
First, second sub-pixel 1-a-A, 1-a-B are connected with common signal line Sa with TFT1-a-B by each self-corresponding TFT1-a-A.TFT1-a-A and TFT1-a-B carry out ON/OFF control according to the voltage that offers common scanning line G1, when two TFT are conducting state, provide voltage to pixel electrode and the auxiliary capacitance electrode that first, second sub-pixel 1-a-A, 1-a-B have separately from common signal line Sa.The auxiliary capacitor comparative electrode of sub-pixel 1-a-A is connected with auxiliary capacitor branch line CS1 by auxiliary capacitor wiring (CS bus) CS1, and the auxiliary capacitor comparative electrode of sub-pixel 1-a-B is connected with auxiliary capacitor branch line CS2 by auxiliary capacitor wiring (CS bus) CS2.As mentioned above, structure shown in Figure 13 is the structure of two a shared auxiliary capacitor wirings of sub-pixel and a sweep trace, has the advantage that can improve aperture ratio of pixels.
Among Figure 14, the light and shade and the polarity of the sub-pixel that changes in being illustrated in during the effective scanning of a certain frame.Among Figure 14, the pixel of expression the first～12 row and a～f row.Among Figure 15, expression drives the waveform of the various voltages (signal) that liquid crystal indicator with structure shown in Figure 13 uses.Among Figure 15, Vsa represents the voltage of signal wire Sa, Vsb represents the voltage of signal wire Sb, Vg1～Vg12 represents the voltage of sweep trace G1～G12, Vcs1～Vcs10 represents the voltage of auxiliary capacitor branch line CS1～CS10, and VLsp1-a-A～VLsp2-b-B is illustrated in the effective voltage that applies on the liquid crystal layer of corresponding sub-pixel.In addition, the waveform shown in Figure 15 is the voltage waveform in a vertical scanning period.
Liquid crystal indicator with structure of Figure 13 drives with the voltage with waveform shown in Figure 15.In the following description, for fear of making explanation too complicated, suppose that all pixels all show same middle gray.Show all in all pixels under the situation of same middle gray that as shown in Figure 15, the voltage Vsa of signal wire Sa and the voltage Vsb of signal wire Sb are respectively with certain cycle and certain amplitude vibration.Be two horizontal scan period (2H) oscillation period of voltage Vsa, Vsb.The voltage Vsb of signal wire Sb and the voltage Vsa of signal wire Sa change like that with phasic difference 180 degree mutually.Among Figure 15, with "+" expression voltage Vsa, Vsb be higher than comparative electrode voltage during, with "-" expression voltage Vsa, Vsb be lower than comparative electrode voltage during.With reference to Fig. 9, as mentioned above, in using the liquid crystal indicator of TFT, after the voltage of signal wire is transferred to pixel electrode by TFT, is subjected to the influence that sweep trace voltage Vg changes and changes, the feedthrough phenomenon takes place.The voltage of comparative electrode is considered the feedthrough phenomenon and is set.In addition, though not shown among Figure 15, the voltage of signal wire Sc, Se is that the voltage Vsa with signal wire Sa changes equally, and the voltage of signal wire Sd, Sf is that the voltage Vsb with signal wire Sb changes equally.In addition, as mentioned above, the voltage Vg of a certain sweep trace from low level (VgL) switch to the moment of high level (VgH), switch to from VgL to the voltage Vg of its next sweep trace till moment of VgH during, be a horizontal scan period (1H).
As shown in figure 15, voltage Vcs1～Vcs10 of auxiliary capacitor branch line CS1～CS10 vibrates with same amplitude and cycle.Here, the cycle of amplitude is 20H.The relation of voltage Vcs1 and Vcs2 is: if one of them voltage becomes VcH, then another voltage just becomes VcL, if one of them voltage becomes VcL, then another voltage just becomes VcH.Voltage Vcs3 and voltage Vcs4, voltage Vcs5 and voltage Vcs6, voltage Vcs7 and voltage Vcs8, voltage Vcs9 and voltage Vcs10 also have the relation identical with Vcs2 with voltage Vcs1.In addition, voltage Vcs3, Vcs4 change behind the 2H that voltage Vcs1, Vcs2 change, below, voltage Vcs5 and Vcs6, voltage Vcs7 and Vcs8, voltage Vcs9 and Vcs10 stagger 2H one by one and change.
If sweep trace voltage Vg becomes VgH from VgL, then the TFT that is connected with this sweep trace is a conducting state, provides corresponding scanning line voltage Vs to the sub-pixel that is connected with this TFT.Then, after sweep trace voltage became VgL, because the voltage of auxiliary capacitor branch line changes, and the voltage variety of this auxiliary capacitor branch line (symbol that comprises change direction, variable quantity) was different for sub-pixel, therefore, the effective voltage difference that the liquid crystal layer of sub-pixel is applied.
Here as illustration, the variation of each voltage of sub-pixel 1-a-A and sub-pixel 1-a-B is described.If the voltage Vg1 of sweep trace G1 becomes VgH from VgL, then liquid crystal capacitance CLC1-a-A, the CLC1-a-B to sub-pixel 1-a-A, 1-a-B charges.When the voltage Vg1 of sweep trace G1 was VgH, the voltage Vsa of signal wire Sa was+, liquid crystal capacitance CLC1-a-A, the CLC1-a-B of sub-pixel 1-a-A, 1-a-B are charged to the current potential that is higher than comparative electrode.Then, if the voltage Vg1 of sweep trace G1 becomes VgL from VgH, then liquid crystal capacitance CLC1-a-A, the CLC1-a-B of sub-pixel 1-a-A, 1-a-B and signal wire Sa electrical isolation, the charging of liquid crystal capacitance CLC1-a-A, CLC1-a-B finishes.After the voltage Vg1 of sweep trace G1 becomes VgL from VgH, the initial change of the voltage Vcs1 of auxiliary capacitor branch line CS1 is to increase, the initial change of the voltage Vcs2 of auxiliary capacitor branch line CS2 is to reduce, and then, voltage Vcs1, Vcs2 increase repeatedly every 10H respectively and reduce.Therefore, among the pixel 1-a that determines by sweep trace G1 and signal wire Sa, the absolute value of the effective voltage that applies on the liquid crystal layer of the sub-pixel 1-a-A that is electrically connected with auxiliary capacitor branch line CS1, the absolute value of the effective voltage that applies on the liquid crystal layer greater than the sub-pixel 1-a-B that is electrically connected with auxiliary capacitor branch line CS2.
Like this, the effective voltage that applies on the liquid crystal layer of each sub-pixel is after corresponding scanning line voltage becomes VgL from VgH, in the initial change in voltage of the auxiliary capacitor branch line of correspondence when increasing, signal lines voltage when being VgH than the voltage of corresponding scanning line will increase, when reducing, the signal lines voltage when being VgH than the voltage of corresponding scanning line will reduce in the initial change in voltage of the auxiliary capacitor branch line of correspondence.Its result, the mark that when corresponding scanning line is selected, line voltage signal is had for+situation under, if the direction of the above-mentioned change in voltage of auxiliary capacitor branch line for increasing is big when then the absolute value of the effective voltage that liquid crystal layer is applied is the direction that reduces than above-mentioned change in voltage.In addition, the mark that when corresponding scanning line is selected, line voltage signal is had for-situation under, if the direction of the above-mentioned change in voltage of auxiliary capacitor branch line for increasing is little when then the absolute value of the effective voltage that liquid crystal layer is applied is the direction that reduces than above-mentioned change in voltage.
As mentioned above, among Figure 14, the light and shade and the polarity of the sub-pixel that changes in being illustrated in during the effective scanning of a certain frame.Among Figure 14, mark " bright " expression sub-pixel is brighter than other sub-pixel, promptly, the absolute value of the effective voltage that applies on the liquid crystal layer of sub-pixel is bigger than other, mark " secretly " expression sub-pixel is darker than other sub-pixel, that is, the absolute value of the effective voltage that applies on the liquid crystal layer of sub-pixel is littler than other.In addition, among Figure 14, the voltage of mark "+" expression pixel electrode is higher than the voltage of comparative electrode, and the voltage of mark "-" expression pixel electrode is lower than the voltage of comparative electrode.In addition, the pixel that pixels that two sub-pixels that comprise in pixel and row are number less and row are number bigger is adjacent, but in two sub-pixels that pixel comprises, the sub-pixel adjacent with number less pixel of row is expressed as " A ", the sub-pixel adjacent with number bigger pixel of row is expressed as " B ".
Then, with reference to Figure 14 and Figure 15, the light and shade and the polarity of each sub-pixel is described.
At first, light and shade and the polarity of sub-pixel 1-a-A that comprises among the pixels illustrated 1-a and sub-pixel 1-a-B.As can be seen from Figure 15, the voltage Vg1 of sweep trace G1 be VgH during, the voltage Vsa of signal wire Sa is higher than the voltage of comparative electrode.Therefore, the polarity of sub-pixel 1-a-A and sub-pixel 1-a-B be+.In addition, when the voltage Vg1 of sweep trace G1 when VgH becomes VgL, voltage Vcs1, the Vcs2 of auxiliary capacitor branch line CS1, the CS2 corresponding with each sub-pixel is in the state of position shown in the arrow among Figure 15 (first arrow of left number).Therefore as can be seen from Figure 15, after the voltage Vg1 of sweep trace G1 becomes VgL from VgH, because the initial change of the voltage Vcs1 of sub-pixel 1-a-A is for increasing (it being expressed as " U "), the initial change of the voltage Vcs2 of the auxiliary capacitor branch line CS2 of sub-pixel 1-a-B is for reducing (it being expressed as " D "), therefore the effective voltage of sub-pixel 1-a-A increases, the effective voltage of sub-pixel 1-a-B reduces, and sub-pixel 1-a-A is brighter than sub-pixel 1-a-B.
Then, light and shade and the polarity of sub-pixel 2-a-A that comprises among the pixels illustrated 2-a and sub-pixel 2-a-B.As shown in figure 15, the voltage Vg2 of sweep trace G2 be VgH during, the voltage Vsa of signal wire Sa is lower than the voltage of comparative electrode.Therefore, the polarity of sub-pixel 2-a-A and 2-a-B be-.In addition, after the voltage Vg2 of sweep trace G2 became VgL from VgH, voltage Vcs2, the Vcs3 of auxiliary capacitor branch line CS2, the CS3 corresponding with each sub-pixel 2-a-A and 2-a-B was in the state of position shown in the arrow among Figure 15 (several second arrow in a left side).Therefore as can be seen from Figure 15, after the voltage Vg1 of sweep trace G1 becomes VgL from VgH, the initial change of the voltage Vcs2 of the auxiliary capacitor branch line CS2 of sub-pixel 2-a-A is for reducing (" D "), and the initial change of the voltage Vcs3 of the auxiliary capacitor branch line CS3 of sub-pixel 2-a-B is for increasing (" U ").Therefore, the absolute value of the effective voltage of sub-pixel 2-a-A increases, and the absolute value of the effective voltage of sub-pixel 2-a-B reduces, and sub-pixel 2-a-A is brighter than sub-pixel 2-a-B.
Then, light and shade and the polarity of sub-pixel 1-b-A that comprises among the pixels illustrated 1-b and sub-pixel 1-b-B.When the voltage Vg1 of sweep trace G1 was VgH, the voltage Vsb of signal wire Sb was lower than the voltage of comparative electrode.Therefore, the polarity of sub-pixel 1-b-A and sub-pixel 1-b-B be-.In addition, when the voltage Vg1 of sweep trace G1 when VgH becomes VgL, voltage Vcs1, the Vcs2 of auxiliary capacitor branch line CS1, the CS2 corresponding with each sub-pixel 1-b-A, sub-pixel 1-b-B is in the state of position shown in the arrow among Figure 15 (first arrow of left number).Therefore as can be seen from Figure 15, after the voltage Vg1 of sweep trace G1 becomes VgL from VgH, the initial change in voltage of the voltage of the auxiliary capacitor branch line of sub-pixel 1-b-A is for increasing (" U "), and the initial change in voltage of the voltage Vcs2 of the auxiliary capacitor branch line CS2 of sub-pixel 1-b-B is for reducing (" D ").Therefore, the absolute value of the effective voltage that applies on the liquid crystal layer of sub-pixel 1-b-A reduces, and the absolute value of the effective voltage of sub-pixel 1-b-B increases, and sub-pixel 1-b-B is brighter than sub-pixel 1-b-A.
Then, light and shade and the polarity of sub-pixel 2-b-A that comprises among the pixels illustrated 2-b and 2-b-B.As shown in figure 15, the voltage Vg2 of sweep trace G2 be VgH during, the voltage Vsb of signal wire Sb is higher than the voltage of comparative electrode.Therefore, the polarity of sub-pixel 2-b-A and sub-pixel 2-b-B be+.In addition, after the voltage Vg2 of sweep trace G2 became VgL from VgH, voltage Vcs2, the Vcs3 of auxiliary capacitor branch line CS2, the CS3 corresponding with each sub-pixel 2-b-A and 2-b-B was in the state of position shown in the arrow among Figure 15 (several second arrow in a left side).Therefore as can be seen from Figure 15, after the voltage Vg1 of sweep trace G1 becomes VgL from VgH, the initial change in voltage of the voltage Vcs2 of the auxiliary capacitor branch line CS2 of sub-pixel 2-b-A is for reducing (" D "), and the initial change of the voltage Vcs3 of the auxiliary capacitor branch line CS3 of sub-pixel 2-b-B is for increasing (" U ").Therefore, the effective voltage of sub-pixel 2-b-A reduces, and the effective voltage of sub-pixel 2-b-B increases, and sub-pixel 2-b-B is brighter than sub-pixel 2-b-A.As known from the above, the light and shade of each sub-pixel and polarity are as shown in figure 14.
Below, illustrate that the liquid crystal indicator of present embodiment satisfies the situation of above-mentioned three conditions.At first, illustrate that the liquid crystal indicator of present embodiment satisfies the situation of first condition.
At first, the situation that satisfies first condition is described, i.e. the situation of the absolute value unanimity of the effective voltage that on each direction of an electric field, the liquid crystal layer of each sub-pixel is applied.Here, in the liquid crystal indicator of present embodiment, each pixel has the sub-pixel that liquid crystal layer is applied different effective voltages, but because the main influence of display quality generation that demonstration is glimmered to what is called is brighter sub-pixel, it is the sub-pixel that is expressed as " bright " among Figure 14, therefore, particularly for sub-pixel, require to satisfy first condition with mark " bright " expression.
On one side with reference to each voltage waveform shown in Figure 15, Yi Bian first condition is described.Expression applies the liquid crystal layer of direction of an electric field (polarity) different " bright " sub-pixel 1-a-A, 2-a-A among Figure 15 voltage VLsp1-a-A, VLsp2-a-A.Among VLsp1-a-A shown in Figure 15, the VLsp2-a-A, solid line is the voltage of the pixel electrode of sub-pixel 1-a-A, 2-a-A, dotted line is the voltage of comparative electrode, because the effective voltage that liquid crystal layer is applied is the voltage difference of solid line and dotted line, therefore, by the voltage of suitable setting comparative electrode, make the effective voltage that on each direction of an electric field liquid crystal layer the applied quantity of electric charge of liquid crystal capacitance charging (or to) consistent as much as possible, thereby can satisfy first condition.
Then, the situation that satisfies second condition is described, promptly in the situation of the different pixel disposed adjacent of each of Semi-polarity image duration.But, in the liquid crystal indicator of present embodiment, because each pixel has the sub-pixel that liquid crystal layer is applied different effective voltages, therefore except satisfying the second condition for pixel request, also the sub-pixel that equates for effective voltage also requires to satisfy second condition each other.Especially the situation with above-mentioned second condition is identical, for than the transom pixel, be among Figure 14 with mark " bright " expression sub-pixel, it is crucial satisfying second condition.
As shown in figure 14, the mark "+" and "-" that represent each sub-pixel polarity (direction of an electric field), for example be that (+,-), (+,-), (+,-) be periodic reversal with two pixels (2 row) on line direction (horizontal direction), on column direction (vertical direction) for example also be for (+,-), (+,-), (+,-), (+,-) be periodic reversal with two pixels (2 is capable).That is,, then present the state of a counter-rotating of being known as, satisfy second condition as if being unit with the pixel.
Then, to bright pixel, be that the sub-pixel of representing with mark " bright " among Figure 14 is confirmed.As shown in figure 14, if see sub-pixel with delegation, for example first the row sub-pixel 1-a-A, 1-b-A, 1-c-A ... then use the polarity of the sub-pixel of mark " bright " expression to be "+" entirely, but if see the sub-pixel of same row, for example sub-pixel 1-a-A, 1-a-B, 2-a-A, the 2-a-B of first row, 3-a-A, 3-a-B ..., then using the polarity of the sub-pixel of mark " bright " expression is periodic reversal for "+", "-", "+", "-" with two pixels (2 row).That is,, then presenting the state of the row counter-rotating of being known as, therefore satisfying second condition as if being unit with the high sub-pixel of the brightness degree of particular importance.In addition, the sub-pixel of representing with mark " secretly " also is configured with same regularity, therefore satisfies second condition
Then, the situation that satisfies the 3rd condition is described.The 3rd condition is meant and makes as far as possible in the different sub-pixel of brightness on one's own initiative that the identical sub-pixel of brightness degree is not adjacent to each other to be configured like that.Among Figure 14, if (for example amount to 4 sub-pixels from two row, two row, sub-pixel 1-a-A, 1-a-B, 1-b-A, 1-b-B), then be configured to " bright ", " secretly " on the column direction, be configured to " secretly ", " bright " on the column direction of next line, if regard these four sub-pixels as a sub-pixel group, then a plurality of sub-pixels dispose in the mode that above-mentioned sub-pixel group is paved with on whole.That is, as shown in figure 14, the mark that " bright " reaches " secretly " to be being that unit is configured to checkerboard in pixel, thereby satisfies the 3rd condition as can be known.
Like this, owing to the liquid crystal indicator of the present embodiment that illustrates with reference to Figure 14 and Figure 15 all satisfies above-mentioned three conditions, therefore can realize preventing the high-quality demonstration of glimmering.
In addition, with reference to Figure 14 and Figure 15, light and shade and the polarity and the voltage waveform of the sub-pixel that has changed in having represented during the effective scanning of a certain frame, but in next frame, voltage with respect to each sweep trace, line voltage signal is respectively similarly to change with waveform shown in Figure 15, and the voltage of auxiliary capacitor wiring changes with waveform counter-rotating shown in Figure 15 respectively.Therefore, in this frame, compare with each sub-pixel shown in Figure 14, the polarity of each sub-pixel does not change, and the light and shade of each sub-pixel is reversed.
In the next frame, with respect to the voltage of sweep trace, line voltage signal changes with waveform counter-rotating shown in Figure 15 respectively again, and the voltage of auxiliary capacitor wiring simultaneously changes with waveform counter-rotating shown in Figure 15 respectively.Therefore, in this frame, compare with each sub-pixel shown in Figure 14, the light and shade of each sub-pixel does not change, and the polarity of each sub-pixel is reversed.
Again in the next frame, with respect to the voltage of sweep trace, line voltage signal is respectively with waveform counter-rotating shown in Figure 15 and change, and the voltage of auxiliary capacitor wiring changes equally with waveform shown in Figure 15 respectively.Therefore, in this frame, compare with each sub-pixel shown in Figure 14, the light and shade and the polarity of each sub-pixel are reversed.
Then, with reference to Figure 16, the change in voltage of a plurality of pixels in the liquid crystal indicator of present embodiment is described.Among Figure 16, Vcs1～Vcs6 represents the voltage of auxiliary capacitor branch line CS1～CS6, and Vg1～Vg3 represents the voltage of sweep trace G1～G3, and VLsp1-a-A～VLsp3-a-B represents the effective voltage that the liquid crystal layer to sub-pixel 1-a-A～3-a-B applies.In addition, in the following description, establishing four continuous frames is frame n, n+1, n+2, n+3.
Among Figure 16, also represented the vertical scanning period of received image signal.The vertical scanning period of received image signal depends on the viewing area (valid pixel line number) of liquid crystal panel 100A by (V-Blank) formation during the selecteed vertical flyback of neither one pixel in (V-Disp) and the liquid crystal panel 100A during the selecteed effective scanning of every row of each pixel in the liquid crystal panel 100A (with reference to Fig. 1) during the effective scanning.
In this instructions, when singly being called " vertical scanning period ", " vertical scanning period " is meant " vertical scanning period of liquid crystal panel ", and " vertical scanning period " (i.e. " vertical scanning period of liquid crystal panel ") is different with the meaning that " vertical scanning period of received image signal " used." vertical scanning period of received image signal " is a frame or a field interval, be meant for each pixel the public moment begin, finish during, and " vertical scanning period " as mentioned above, be meant select in order to write shows signal voltage a certain sweep trace rise, to select in order to write next shows signal voltage till this sweep trace during, begin constantly in difference according to corresponding scanning line, finish constantly in difference.
Among Figure 16, represent zero hour of " vertical scanning period " and the finish time capable and different situation according to pixel with oblique line.As can be seen from Figure 16, in a frame, sweep trace is selected successively since first row, if sweep trace is selected, then the voltage of Dui Ying pixel electrode changes, and the vertical scanning period of this sub-pixel begins.As mentioned above, the vertical scanning period of received image signal by effective scanning during during (V-Disp) and the vertical flyback (V-Blank) constitute, but the vertical scanning period of a certain sub-pixel during the effective scanning of frame n midway, during vertical flyback, last till always during the effective scanning of frame n+1 midway till.Then, if select corresponding scanning line, then the next vertical scanning period in this sub-pixel begins.In addition, for any one pixel, the length of the length of " vertical scanning period " and " vertical scanning period of received image signal " all equates.
As can be seen from Figure 16, from frame n to frame n+3, (light and shade, the polarity) of sub-pixel 1-a-A changes successively with (bright ,+), (dark ,+), (bright,-), (dark,-), and (light and shade, the polarity) of sub-pixel 1-a-B changes with the order of (dark ,+), (bright ,+), (dark,-), (bright,-).In addition, (light and shade, the polarity) of sub-pixel 2-a-A changes successively with (bright,-), (dark,-), (bright ,+), (dark ,+), and (light and shade, the polarity) of sub-pixel 2-a-B changes with the order of (dark,-), (bright,-), (dark ,+), (bright ,+).
Among Figure 17, the change in voltage of the auxiliary capacitor wiring that begins in the light and shade of expression sub-pixel 1-a-A, 1-a-B and the vertical scanning period of polarity and sub-pixel 1-a-A, 1-a-B.As shown in figure 17, in frame n, the polarity of sub-pixel 1-a-A, 1-a-B is+, and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of sub-pixel 1-a-A wiring is for increasing (" ↑ "), and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of sub-pixel 1-a-B wiring is for reducing (" ↓ ").In addition, in frame n+1, the polarity of sub-pixel 1-a-A, 1-a-B is+, and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of sub-pixel 1-a-A wiring is for reducing (" ↓ "), and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of sub-pixel 1-a-B wiring is for increasing (" ↑ ").
In frame n+2, the polarity of sub-pixel 1-a-A, 1-a-B is-, and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of sub-pixel 1-a-A wiring is for reducing (" ↓ "), and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of sub-pixel 1-a-B wiring is for increasing (" ↑ ").In addition, in frame n+3, the polarity of sub-pixel 1-a-A, 1-a-B is-, and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of sub-pixel 1-a-A wiring is for increasing (" ↑ "), and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of sub-pixel 1-a-B wiring is for reducing (" ↓ ").
As mentioned above, sub-pixel 1-a-A (change in voltage of the beginning of polarity, auxiliary capacitor wiring), changes with the order of (+, ↑), (+, ↓), (, ↓), (, ↑) to frame n+3 from frame n, occurs different combinations successively.On the other hand, (change in voltage of the beginning of polarity, auxiliary capacitor wiring) of sub-pixel 1-a-B from frame n to frame n+3, order with (+, ↓), (+, ↑), (, ↑), (, ↓) changes, polarity is identical with sub-pixel 1-a-A's, and different combinations appears in the change in voltage of auxiliary capacitor wiring successively.
In addition, in the above description, the voltage of auxiliary capacitor wiring is that one-period carries out cyclical variation with 20H in during showing, but the present invention is not limited to this.The voltage of auxiliary capacitor wiring also can be shown in Figure 18 (a), is that one-period changes with 16H in during showing.In this case, for example, the first and the 3rd the adjustment period between among the BH, the voltage of auxiliary capacitor wiring changes every 13H, the second and the 4th the adjustment period between among the BH, the voltage of auxiliary capacitor wiring changes every 9H.Perhaps, the voltage of auxiliary capacitor wiring also can be shown in Figure 18 (b), is that one-period changes with 24H in during showing.In this case, for example, the first and the 3rd the adjustment period between among the BH, the voltage of auxiliary capacitor wiring changes every 15H, the second and the 4th the adjustment period between among the BH, the voltage of auxiliary capacitor wiring changes every 21H.The time of the change in voltage of the auxiliary capacitor of BH wiring during this time can suitably be changed by the value of V-total.
In addition, in the above-mentioned explanation, the voltage of auxiliary capacitor wiring the adjustment period between in the variation one-period, but the present invention is not limited to this.The voltage of auxiliary capacitor wiring also can be shown in Figure 19 (a), each the adjustment period between in be that one-period carries out cyclical variation with 2H, can shown in Figure 19 (b), be that one-period carries out cyclical variation also with 1H.Perhaps, the voltage of auxiliary capacitor wiring also can be shown in Figure 19 (c), the adjustment period between in keep the mean value of VcH and VcL.
In addition, in the above-mentioned explanation, the adjustment period of having one for corresponding with a frame vertical scanning period between, but the present invention is not limited to this.As shown in figure 20, also can be the adjustment period of having one for corresponding with two frames two vertical scanning period between.Among Figure 20, each vertical scanning period is 810H, and auxiliary capacitor voltage Vcs1～Vcs3 is that one-period carries out cyclical variation with 20H in during showing, the adjustment period between in change every 5H.Like this, (810H * 2=1620H) is during for the integral multiple of the one-period (20H) in during showing when two vertical scanning period, by the voltage to auxiliary capacitor wiring be provided with the semiperiod during as the adjustment period between, and its polarity is reversed every two vertical scanning period, thereby as illustrated with reference to Figure 17, the variation of the auxiliary capacitor voltage that begins in the variation that can make the auxiliary capacitor voltage that begins in the 3rd vertical scanning period and first vertical scanning period is different, thereby shown in Fig. 6 (a), can change the light and shade and the polarity of sub-pixel.
In addition, in the above-mentioned explanation, each the adjustment period between be the even-multiple of horizontal scan period, but the present invention is not limited to this.Each the adjustment period between also can be the odd-multiple of horizontal scan period.As shown in figure 21, even be 37H between the first and the 3rd the adjustment period, be 27H between the adjustment period of the second and the 4th, also the situation with the even-multiple of horizontal scan period is identical, by the light and shade and the polarity of inverted rotor pixel, can suppress to show coarse.
In addition, in the above-mentioned explanation, two sub-pixels of neighbor are connected with same auxiliary capacitor wiring, but the present invention is not limited to this.Different auxiliary capacitor wirings also can be set two sub-pixels of neighbor, the voltage of auxiliary capacitor wiring is changed respectively separately.
Among Figure 22, the light and shade and the polarity of the sub-pixel that changes in being illustrated in during the effective scanning of a certain frame.Among Figure 22, the pixel of expression the first～six row and a～f row.Here too, be provided with 10 auxiliary capacitor branch line CS1～CS10 in the liquid crystal indicator 100, as shown in figure 22, sub-pixel 1-a-A, the 1-b-A of the auxiliary capacitor branch line CS1 and first pixel column, 1-c-A ... sub-pixel 6-a-A, 6-b-A, 6-c-A with the 6th pixel column ... connect sub-pixel 1-a-B, 1-b-B, the 1-c-B of the auxiliary capacitor branch line CS2 and first pixel column ... sub-pixel 6-a-B, 6-b-B, 6-c-B with the 6th pixel column ... connect.In addition, auxiliary capacitor branch line CS3 is connected with sub-pixel 2-a-A, 2-b-A, the 2-c-A of second pixel column.Like this, in the liquid crystal indicator 100 with structure shown in Figure 22, the sub-pixel that comprises in a certain sub-pixel and another pixel adjacent with this sub-pixel connects two electric independences of sub-pixel with different auxiliary capacitor wiring respectively.
Among Figure 23, expression has the equivalent electrical circuit of the liquid crystal indicator 100 of structure shown in Figure 22, among Figure 24, and the waveform of the various voltages (signal) that this liquid crystal indicator of expression driving is used.Among Figure 24, Vsa represents the voltage of signal wire Sa, Vsb represents the voltage of signal wire Sb, Vg1～Vg12 represents the voltage of sweep trace G1～G12, Vcs1～Vcs10 represents the voltage of auxiliary capacitor branch line CS1～CS10, and VLsp1-a-A～VLsp2-b-B represents the effective voltage that the liquid crystal layer to sub-pixel 1-a-A～2-b-B applies.In addition, be voltage waveform in the vertical scanning period shown in Figure 24.
As shown in figure 24, voltage Vcs1～Vcs10 of auxiliary capacitor branch line CS1～CS10 vibrates with same amplitude and cycle.Here, the cycle of amplitude is 10H.The relation of voltage Vcs1 and Vcs2 is: if one of them voltage becomes VcH, then another voltage just becomes VcL, if one of them voltage becomes VcL, then another voltage just becomes VcH.Voltage Vcs3 also has identical relation with voltage Vcs8, voltage Vcs9 with voltage Vcs10 with voltage Vcs6, voltage Vcs7 with voltage Vcs4, voltage Vcs5.As can be seen from Figure 24, after the voltage Vg1 of sweep trace G1 became VgL, voltage Vcs1 increased " ↑ ", and voltage Vcs2 reduces " ↓ ".In addition, from Figure 24 also as can be known, after the voltage Vg2 of sweep trace G2 became VgL, voltage Vcs3 reduced " ↓ ", and voltage Vcs4 increases " ↑ ".
In structure shown in Figure 22, because the sub-pixel of different rows connects with different auxiliary capacitor branch line, therefore can be in each pixel of a plurality of pixels, make the voltage that applies on the liquid crystal layer of sub-pixel in the synchronization increase or reduce.In addition, in this case, owing to also can drive the liquid crystal indicator of structure shown in Figure 22, thereby satisfy above-mentioned all three conditions, therefore can prevent flicker and realize high-quality demonstration with voltage waveform shown in Figure 24.
In addition, light and shade and the polarity and the voltage waveform of the sub-pixel that has changed in having illustrated during the effective scanning of a certain frame with reference to Figure 22～Figure 24 here, but in next frame, voltage with respect to each sweep trace, line voltage signal similarly changes with waveform shown in Figure 24 respectively, and the voltage of auxiliary capacitor branch line is respectively with waveform counter-rotating shown in Figure 24 and change.Therefore, in this frame, with each sub-pixel comparison shown in Figure 22, the polarity of each sub-pixel does not change, the light and shade counter-rotating of each sub-pixel.
In the next frame, with respect to the voltage of sweep trace, line voltage signal changes with waveform counter-rotating shown in Figure 24 respectively again, and the voltage of auxiliary capacitor branch line changes with waveform counter-rotating shown in Figure 24 respectively simultaneously.Therefore, in this frame, compare with each sub-pixel shown in Figure 22, the light and shade of each sub-pixel does not change, and the polarity of each sub-pixel is reversed.
Again in the next frame, with respect to the voltage of sweep trace, line voltage signal is respectively with waveform counter-rotating shown in Figure 24 and change, and the voltage of auxiliary capacitor branch line changes equally with waveform shown in Figure 24 respectively.Therefore, in this frame, compare with each sub-pixel shown in Figure 22, the light and shade and the polarity of each sub-pixel are reversed.Like this, even in the liquid crystal display layer of structure shown in Figure 22, also can improve the angle of visibility interdependence of γ characteristic, and can suppress the reduction of display quality.
In addition, in the above-mentioned explanation, as shown in Figure 8, be provided with common signal line 14 for the sub-pixel 10a, the 10b that comprise in the same pixel 10, but the present invention is not limited to this.Also different signal wires can be set to the sub-pixel that comprises in the same pixel.In this case, even the voltage of auxiliary capacitor wiring is not all inequality to each sub-pixel, also can come the liquid crystal layer of sub-pixel is applied different effective voltages by making the line voltage signal difference.
Among Figure 25, expression is provided with the pixel 10 of signal wire 14a, 14b to each sub-pixel of two sub-pixel 10a, 10b.As shown in figure 25, pixel 10 has two pixel electrode 18a and the 18b that is connected with 14b by each self-corresponding TFT16a and 16b and mutually different signal wire 14a.Because sub-pixel 10a and 10b constitute a pixel 10, so the grid of TFT16a and 16b is connected with common scanning line (grid bus) 12, utilizes same sweep signal to carry out ON/OFF and controls.Provide signal voltage (grayscale voltage) to satisfy above-mentioned relation to signal wire (source bus line) 14a and 14b.In addition, the grid of TFT16a and 16b preferably adopts public structure.
In addition, in the above-mentioned explanation, the voltage of expression comparative electrode be fix and irrelevant with the time, but the present invention is not limited to this.The voltage of comparative electrode also can time to time change.
In addition, among Figure 10, the effective voltage of having represented the effective voltage of first sub-pixel and second sub-pixel is all different in high-gray level scope very, but the present invention is not limited to this.The effective voltage of each sub-pixel if in specific tonal range (for example, black～gray scale between white being divided into the tonal range of 36 gray scales～128 gray scales under the situation that 256 gray scales of 0 gray scale～256 gray scales show) different getting final product.
In addition, in the above-mentioned explanation, represented to improve liquid crystal indicator, the especially display quality of the liquid crystal indicator of MVA pattern of normal black pattern, but the present invention is not limited to this, also goes for the liquid crystal indicator of IPS pattern.The angle of visibility interdependence problem of γ characteristic is come significantly in than IPS pattern in MVA pattern and ASM pattern.And on the other hand, the IPS pattern is compared with MVA pattern or ASM pattern, the high liquid crystal panel of contrast when being difficult to high yield manufacturing top view.Owing to these reasons, especially wish to improve the angle of visibility interdependence of the γ characteristic in the liquid crystal indicator of MVA pattern and ASM pattern.
(embodiment 2)
Below, second embodiment according to liquid crystal indicator 100 of the present invention is described.The liquid crystal indicator 100 of present embodiment is the order of the variation of light and shade, polarity and the effective voltage of the sub-pixel in continuous four vertical scanning period with the difference of the liquid crystal indicator of embodiment 1.Below in the explanation,, omit the explanation that repeats with embodiment 1 for fear of complicated.
With reference to Figure 26, the variation of the light and shade of the sub-pixel in the liquid crystal indicator 100 of present embodiment and direction of an electric field is described and the variation of the effective voltage that on the liquid crystal layer of first and second sub-pixels, applies.
Shown in Figure 26 (a), during 1,4,5 be between first polarity epoch, during 2,3,6 be between second polarity epoch.Here, if see four continuous vertical scanning period, then have two to be between first polarity epoch, remaining two is between second polarity epoch.For example, in Figure 26 (a) during 1～4, during 1 and during 4 be between first polarity epoch, during 2 and during 3 be between second polarity epoch.In the liquid crystal indicator 100 of present embodiment, between first polarity epoch, have satisfied | VLspa|〉| during the VLspb| (here 1) and satisfy | VLspa|＜| during the VLspb| (during being here 4).In addition, in liquid crystal indicator 100, between second polarity epoch, have satisfied | VLspa|〉| during the VLspb| (here 3) and satisfy | VLspa|＜| during the VLspb| (during being here 2).
Among Figure 26 (b) and Figure 26 (c), represent effective voltage VLspa, the VLspb of each vertical scanning period of applying on the liquid crystal layer of first, second sub-pixel respectively with thick line.The effective value of the difference of the voltage Vc of the effective voltage VLspa that applies on the liquid crystal layer of first, second sub-pixel, the voltage that VLspb is first, second pixel electrode and comparative electrode, the voltage Vc of represented here comparative electrode fixes.
During in 1, the voltage of first pixel electrode and second pixel electrode all is higher than the voltage of comparative electrode.In addition, the absolute value of the effective voltage that applies on the liquid crystal layer of absolute value greater than second sub-pixel of the effective voltage that applies on the liquid crystal layer of first sub-pixel (| VLspa|〉| VLspb|).Thereby, shown in Figure 26 (a), during 1 be between first polarity epoch, first sub-pixel is brighter than second sub-pixel.
During in 2, the voltage of first pixel electrode and second pixel electrode all is lower than the voltage of comparative electrode.In addition, the absolute value of the effective voltage that applies on the liquid crystal layer of absolute value greater than first sub-pixel of the effective voltage that applies on the liquid crystal layer of second sub-pixel (| VLspa|＜| VLspb|).Thereby, shown in Figure 26 (a), during 2 be between second polarity epoch, second sub-pixel is brighter than first sub-pixel.
During in 3, the voltage of first pixel electrode and second pixel electrode all is lower than the voltage of comparative electrode.In addition, the absolute value of the effective voltage that applies on the liquid crystal layer of absolute value greater than second sub-pixel of the effective voltage that applies on the liquid crystal layer of first sub-pixel (| VLspa|〉| VLspb|).Thereby, shown in Figure 26 (a), during 3 be between second polarity epoch, first sub-pixel is brighter than second sub-pixel.
During in 4, the voltage of first pixel electrode and second pixel electrode all is higher than the voltage of comparative electrode.In addition, the absolute value of the effective voltage that applies on the liquid crystal layer of absolute value greater than first sub-pixel of the effective voltage that applies on the liquid crystal layer of second sub-pixel (| VLspa|＜| VLspb|).Thereby, shown in Figure 26 (a), during 4 be between first polarity epoch, second sub-pixel is brighter than first sub-pixel.From during 5, the light and shade and the polarity of first, second sub-pixel during the light and shade of first, second sub-pixel and polarity repeat in 1～4.
As known from the above, shown in Figure 26 (a), (light and shade, the polarity) of first sub-pixel changes successively with (bright ,+), (dark,-), (bright,-), (dark ,+), and (light and shade, the polarity) of second sub-pixel changes with the order of (dark ,+), (bright,-), (dark,-), (bright ,+).Like this, in the liquid crystal indicator of present embodiment, every the light and shade of vertical scanning period inverted rotor pixel, and every two vertical scanning period reversed polarities.In the liquid crystal indicator of present embodiment, the same with the liquid crystal indicator of embodiment 1, because the light and shade of sub-pixel is reversed every vertical scanning period, therefore can suppress to show coarse.In addition, in the liquid crystal indicator of present embodiment, the same with the liquid crystal indicator of embodiment 1, because between first polarity epoch and all have between second polarity epoch first sub-pixel than second sub-pixel bright during, therefore shown in Figure 26 (b) and Figure 26 (c), in a plurality of vertical scanning period (for example 1～4), the mean value of the mean value of effective voltage VLspa and effective voltage VLspb about equally, by adjusting relative voltage, can make effective voltage VLspa, the mean value of VLspb all is zero, its result can suppress to produce the problem on the reliabilities such as burning screen.
Among Figure 27, represent the variation of the voltage of the auxiliary capacitor wiring that begins in the vertical scanning period of the light and shade of first, second sub-pixel and polarity and first, second sub-pixel.Among Figure 27, four continuous frames are expressed as frame n, n+1, n+2, n+3.
As shown in figure 27, in frame n, the polarity of first, second sub-pixel is+, and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of first sub-pixel wiring is for increasing (" ↑ "), and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of second sub-pixel wiring is for reducing (" ↓ ").In addition, in frame n+1, the polarity of first, second sub-pixel is-, and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of first sub-pixel wiring is for increasing (" ↑ "), and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of second sub-pixel wiring is for reducing (" ↓ ").
In frame n+2, the polarity of first, second sub-pixel is-, and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of first sub-pixel wiring is for reducing (" ↓ "), and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of second sub-pixel wiring is for increasing (" ↑ ").In addition, in frame n+3, the polarity of first, second sub-pixel is+, and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of first sub-pixel wiring is for reducing (" ↓ "), and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of second sub-pixel wiring is for increasing (" ↑ ").
In addition, in for Fig. 6 (a) that 1 reference of embodiment is described, the light and shade and the polarity of the sub-pixel during under the situation of hypothesis transposing first sub-pixel and second sub-pixel in 2～5, with shown in Figure 26 (a) during the light and shade and the polarity of sub-pixel in 1～4 consistent.Thereby when the display area of first pixel electrode equated with the display area of second pixel electrode, in fact the liquid crystal indicator of present embodiment played the effect identical with the liquid crystal indicator of embodiment 1.
(embodiment 3)
Below, the 3rd embodiment according to liquid crystal indicator 100 of the present invention is described.The liquid crystal indicator 100 of present embodiment is the order of the variation of light and shade, polarity and the effective voltage of the sub-pixel in continuous four vertical scanning period with the difference of above-mentioned liquid crystal indicator.Below in the explanation, for fear of complicated, the repetitive description thereof will be omitted.
With reference to Figure 28, the variation of the light and shade of the sub-pixel in the liquid crystal indicator 100 of present embodiment and polarity is described and the variation of the effective voltage that on the liquid crystal layer of first and second sub-pixels, applies.
Shown in Figure 28 (a), in the liquid crystal indicator 100 of present embodiment, during 1,3,5 be between first polarity epoch, during 2,4,6 be between second polarity epoch.Here, if see four continuous vertical scanning period, then have two to be between first polarity epoch, remaining two is between second polarity epoch.For example, in Figure 28 (a) during 1～4, during 1 and during 3 be between first polarity epoch, during 2 and during 4 be between second polarity epoch.In the liquid crystal indicator 100 of present embodiment, between first polarity epoch, have satisfied | VLspa|〉| during the VLspb| (here 1) and satisfy | VLspa|＜| during the VLspb| (during being here 3).In addition, in liquid crystal indicator 100, between second polarity epoch, have satisfied | VLspa|〉| during the VLspb| (here 2) and satisfy | VLspa|＜| during the VLspb| (during being here 4).
Among Figure 28 (b) and Figure 28 (c), represent effective voltage VLspa, the VLspb of each vertical scanning period of applying on the liquid crystal layer of first, second sub-pixel respectively with thick line.The effective value of the difference of the voltage Vc of the effective voltage VLspa that applies on the liquid crystal layer of first, second sub-pixel, the voltage that VLspb is first, second pixel electrode and comparative electrode, the voltage Vc of represented here comparative electrode fixes.
During in 1, the voltage of first pixel electrode and second pixel electrode all is higher than the voltage of comparative electrode.In addition, the absolute value of the effective voltage that applies on the liquid crystal layer of absolute value greater than second sub-pixel of the effective voltage that applies on the liquid crystal layer of first sub-pixel (| VLspa|〉| VLspb|).Thereby, shown in Figure 28 (a), during 1 be between first polarity epoch, first sub-pixel is brighter than second sub-pixel.
During in 2, the voltage of first pixel electrode and second pixel electrode all is lower than the voltage of comparative electrode.In addition, the absolute value of the effective voltage that applies on the liquid crystal layer of absolute value greater than second sub-pixel of the effective voltage that applies on the liquid crystal layer of first sub-pixel (| VLspa|〉| VLspb|).Thereby, shown in Figure 28 (a), during 2 be between second polarity epoch, first sub-pixel is brighter than second sub-pixel.
During in 3, the voltage of first pixel electrode and second pixel electrode all is higher than the voltage of comparative electrode.In addition, the absolute value of the effective voltage that applies on the liquid crystal layer of absolute value greater than first sub-pixel of the effective voltage that applies on the liquid crystal layer of second sub-pixel (| VLspa|＜| VLspb|).Thereby, shown in Figure 28 (a), during 3 be between first polarity epoch, second sub-pixel is brighter than first sub-pixel.
During in 4, the voltage of first pixel electrode and second pixel electrode all is lower than the voltage of comparative electrode.In addition, the absolute value of the effective voltage that applies on the liquid crystal layer of absolute value greater than first sub-pixel of the effective voltage that applies on the liquid crystal layer of second sub-pixel (| VLspa|＜| VLspb|).Thereby, shown in Figure 28 (a), during 4 be between second polarity epoch, second sub-pixel is brighter than first sub-pixel.From during 5, the light and shade and the polarity of first, second sub-pixel during the light and shade of first, second sub-pixel and polarity repeat in 1～4.In the liquid crystal indicator of present embodiment, frame frequency is for example 120Hz.
As known from the above, shown in Figure 28 (a), (light and shade, the polarity) of first sub-pixel changes successively with (bright ,+), (bright,-), (dark ,+), (dark,-), and (light and shade, the polarity) of second sub-pixel changes with the order of (dark ,+), (dark,-), (bright ,+), (bright,-).Like this, in the liquid crystal indicator of present embodiment, every the light and shade of two vertical scanning period inverted rotor pixels, and every the vertical scanning period reversed polarity.The liquid crystal indicator of present embodiment is different with the liquid crystal indicator of patent documentation 1, because the light and shade of sub-pixel is every two vertical scanning period counter-rotatings, therefore can suppress to show coarse.In addition, the liquid crystal indicator of present embodiment is different with the liquid crystal indicator of patent documentation 2, because between first polarity epoch and the counter-rotating of first, second sub-pixel light and shade all takes place between second polarity epoch, therefore shown in Figure 28 (b) and Figure 28 (c), in a plurality of vertical scanning period (for example 1～4), the mean value of the mean value of effective voltage VLspa and effective voltage VLspb about equally, by adjusting relative voltage, the mean value that can make effective voltage VLspa, VLspb all is zero, its result can suppress to produce the problem on the reliabilities such as burning screen.
Then, with reference to Figure 29, the variation of the effective voltage that applies on the liquid crystal layer of inherent first, second sub-pixel of a plurality of vertical scanning period is described.Among Figure 29, Vg represents the voltage of sweep trace, Vcsa represents the voltage of first auxiliary capacitor wiring, Vcsb represents the voltage of second auxiliary capacitor wiring, VLspa is illustrated in the effective voltage that applies on the liquid crystal layer of first sub-pixel, and VLspb is illustrated in the effective voltage that applies on the liquid crystal layer of second sub-pixel.Here, the voltage of first, second auxiliary capacitor wiring increases every 10H among the AH during showing or reduces, and is that one-period carries out cyclical variation with 20H.In addition, the voltage of first, second auxiliary capacitor wiring increases every 18H among the BH between the first, the 3rd the adjustment period or reduces, and increases every 13H among the BH between the second, the 4th the adjustment period or reduces.
Variation according to the voltage of first, second auxiliary capacitor wiring changes the effective voltage that applies on the liquid crystal layer of first, second sub-pixel, (light and shade, the polarity) thereby that makes the sub-pixel of winning changes successively with (bright ,+), (bright,-), (dark ,+), (dark,-), and (light and shade, the polarity) of second sub-pixel changes with the order of (dark ,+), (dark,-), (bright ,+), (bright,-).Like this, because the light and shade and the polarity of first and second sub-pixels change shown in Figure 28 (a) like that, therefore, the liquid crystal indicator of present embodiment also can suppress the reduction of display quality in the liquid crystal indicator of the angle of visibility interdependence that improves the γ characteristic.
Among Figure 30, represent the variation of the voltage of the auxiliary capacitor wiring that begins in the vertical scanning period of the light and shade of first, second sub-pixel and polarity and first, second sub-pixel.Among Figure 30, four continuous frames are expressed as frame n, n+1, n+2, n+3.
As shown in figure 30, in frame n, the polarity of first, second sub-pixel is+, and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of first sub-pixel wiring is for increasing (" ↑ "), and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of second sub-pixel wiring is for reducing (" ↓ ").In addition, in frame n+1, the polarity of first, second sub-pixel is-, and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of first sub-pixel wiring is for reducing (" ↓ "), and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of second sub-pixel wiring is for increasing (" ↑ ").
In frame n+2, the polarity of first, second sub-pixel is+, and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of first sub-pixel wiring is for reducing (" ↓ "), and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of second sub-pixel wiring is for increasing (" ↑ ").In addition, in frame n+3, the polarity of first, second sub-pixel is-, and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of first sub-pixel wiring is for increasing (" ↑ "), and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of second sub-pixel wiring is for reducing (" ↓ ").
In addition, from Figure 17 and Figure 30 more as can be known, in the liquid crystal indicator of present embodiment, the change in voltage of the auxiliary capacitor wiring that begins in the vertical scanning period of first, second sub-pixel is identical with the liquid crystal indicator of embodiment 1, but change in polarity is different with the liquid crystal indicator of embodiment 1.
The difference of the returing cycle of the light and shade of sub-pixel in the liquid crystal indicator of the liquid crystal indicator of present embodiment and embodiment 1 is described here.In the liquid crystal indicator of present embodiment, as shown in figure 28, the light and shade of sub-pixel is every two vertical scanning period counter-rotatings, on the contrary, in the liquid crystal indicator of embodiment 1, as shown in Figure 6, the light and shade of sub-pixel is every a vertical scanning period counter-rotating.Therefore, in the liquid crystal indicator of present embodiment, the light and shade returing cycle of sub-pixel is than the long twice of the liquid crystal indicator of embodiment 1.By above content as can be known, the light and shade by the inverted rotor pixel can reduce coarse, and the light and shade returing cycle of sub-pixel is short more, and it is just high more to reduce coarse effect.But then, if vertical scanning period is too short, then the orientation of liquid crystal molecule can't fully change in a vertical scanning period, and its result can't reach predetermined brightness sometimes.Like this,, then can't obtain the luminance difference between enough sub-pixels, thereby reduce the effect of the angle of visibility interdependence of improving the γ characteristic if vertical scanning period is too short compared to the response speed of liquid crystal molecule.
In the table 1, the display quality of liquid crystal indicator when frame frequency changes of expression patent documentation 1, patent documentation 2, embodiment 1 and present embodiment.In the table 1, the usefulness that display quality is good " zero " expression, usefulness " * " expression of display quality difference.
[table 1]
Frame frequency 50Hz 60Hz 75Hz 90Hz 120Hz
Patent documentation
1 angle of visibility improves the coarse flicker of effect (Flicker) reliability patent documentation 2 angle of visibilities and improves the coarse flicker of effect (Flicker) reliability ○ ○ ○ ○ ○× × × × ×○ ○ ○ ○ ○○ ○ ○ ○ ○○ ○ ○ ○ ×○ ○ ○ ○ ○○ ○ ○ ○ ○× × × × ×
Embodiment 1 (with reference to Fig. 6) angle of visibility improves the coarse flicker of effect (Flicker) reliability embodiment 3 (with reference to Figure 28) angle of visibility and improves the coarse flicker of effect (Flicker) reliability ○ ○ ○ ○ ×○ ○ ○ ○ ○× ○ ○ ○ ○○ ○ ○ ○ ○○ ○ ○ ○ ○○ ○ ○ ○ ○× × × × ○○ ○ ○ ○ ○
According to table 1, the liquid crystal indicator of patent documentation 1 can both obtain good angle of visibility for all frame frequencies and improve effect, and on the other hand, for all frame frequencies the coarse problem of demonstration is arranged all.In addition, for the liquid crystal indicator of patent documentation 2, can't be used for industrial products owing to the problem on the reliability.
Therefore the liquid crystal indicator of embodiment 1,3 all is not created in the problem on the reliability that becomes problem in the patent documentation 2, can be used as industrial products and no problem.And, between the liquid crystal indicator of embodiment 1,3 has also solved and has become in patent documentation 1 topic demonstration coarse between the topic.
Yet, if the liquid crystal indicator of embodiment 1 and embodiment 3 relatively,, can carry out optimal selection to frame frequency from the improving effect and show flicker (Flicker) this point of angle of visibility characteristic.As shown in table 1, for the liquid crystal indicator of embodiment 1, if frame frequency is below the above 90Hz of 60Hz, then can obtain good display quality, on the contrary, for the liquid crystal indicator of present embodiment, if frame frequency more than 120Hz, then can be realized the demonstration of flicker free.In addition, liquid crystal indicator for present embodiment, experimental verification the frame frequency effect of angle of visibility interdependence of γ characteristic that can be improved during for 120Hz, but for the frame frequency more than the 120Hz, preferably improve response speed by liquid crystal material or driving method.
(embodiment 4)
Below, the 4th embodiment according to liquid crystal indicator 100 of the present invention is described.The liquid crystal indicator 100 of present embodiment is the order of the variation of light and shade, polarity and the effective voltage of the sub-pixel in continuous four vertical scanning period with the difference of above-mentioned liquid crystal indicator.Below in the explanation, for fear of complicated, the repetitive description thereof will be omitted.
With reference to Figure 31, the variation of the light and shade of the sub-pixel in the liquid crystal indicator 100 of present embodiment and polarity is described and the variation of the effective voltage that on the liquid crystal layer of first and second sub-pixels, applies.
Shown in Figure 31 (a), in the liquid crystal indicator 100 of present embodiment, during 1,3,5 be between first polarity epoch, during 2,4,6 be between second polarity epoch.Here, if see four continuous vertical scanning period, then have two to be between first polarity epoch, remaining two is between second polarity epoch.For example, in Figure 31 (a) during 1～4, during 1 and during 3 be between first polarity epoch, during 2 and during 4 be between second polarity epoch.In the liquid crystal indicator 100 of present embodiment, between first polarity epoch, have satisfied | VLspa|〉| during the VLspb| (here 1) and satisfy | VLspa|＜| during the VLspb| (during being here 3).In addition, in liquid crystal indicator 100, between second polarity epoch, have satisfied | VLspa|〉| during the VLspb| (here 4) and satisfy | VLspa|＜| during the VLspb| (during being here 2).
Among Figure 31 (b) and Figure 31 (c), represent effective voltage VLspa, the VLspb of each vertical scanning period of applying on the liquid crystal layer of first, second sub-pixel respectively with thick line.The effective value of the difference of the voltage Vc of the effective voltage VLspa that applies on the liquid crystal layer of first, second sub-pixel, the voltage that VLspb is first, second pixel electrode and comparative electrode, the voltage Vc of represented here comparative electrode fixes.
During in 1, the voltage of first pixel electrode and second pixel electrode all is higher than the voltage of comparative electrode.In addition, the absolute value of the effective voltage that applies on the liquid crystal layer of absolute value greater than second sub-pixel of the effective voltage that applies on the liquid crystal layer of first sub-pixel (| VLspa|〉| VLspb|).Thereby, shown in Figure 31 (a), during 1 be between first polarity epoch, first sub-pixel is brighter than second sub-pixel.
During in 2, the voltage of first pixel electrode and second pixel electrode all is lower than the voltage of comparative electrode.In addition, the absolute value of the effective voltage that applies on the liquid crystal layer of absolute value greater than first sub-pixel of the effective voltage that applies on the liquid crystal layer of second sub-pixel (| VLspa|＜| VLspb|).Thereby, shown in Figure 31 (a), during 2 be between second polarity epoch, second sub-pixel is brighter than first sub-pixel.
During in 3, the voltage of first pixel electrode and second pixel electrode all is higher than the voltage of comparative electrode.In addition, the absolute value of the effective voltage that applies on the liquid crystal layer of absolute value greater than first sub-pixel of the effective voltage that applies on the liquid crystal layer of second sub-pixel (| VLspa|＜| VLspb|).Thereby, shown in Figure 31 (a), during 3 be between first polarity epoch, second sub-pixel is brighter than first sub-pixel.
During in 4, the voltage of first pixel electrode and second pixel electrode all is lower than the voltage of comparative electrode.In addition, the absolute value of the effective voltage that applies on the liquid crystal layer of absolute value greater than second sub-pixel of the effective voltage that applies on the liquid crystal layer of first sub-pixel (| VLspa|〉| VLspb|).Thereby, shown in Figure 31 (a), during 4 be between second polarity epoch, first sub-pixel is brighter than second sub-pixel.From during 5, the light and shade and the polarity of first, second sub-pixel during the light and shade of first, second sub-pixel and polarity repeat in 1～4.
As known from the above, shown in Figure 31 (a), (light and shade, the polarity) of first sub-pixel changes successively with (bright ,+), (dark,-), (dark ,+), (bright,-), and (light and shade, the polarity) of second sub-pixel changes with the order of (dark ,+), (bright,-), (bright ,+), (dark,-).Like this, in the liquid crystal indicator of present embodiment, every the light and shade of two vertical scanning period inverted rotor pixels, and every the vertical scanning period reversed polarity.In the present embodiment, frame frequency is for example 120Hz.
Among Figure 32, represent the variation of the voltage of the auxiliary capacitor wiring that begins in the vertical scanning period of the light and shade of first, second sub-pixel and polarity and first, second sub-pixel.Among Figure 32, four continuous frames are expressed as frame n, n+1, n+2, n+3.
Shown in figure 32, in frame n, the polarity of first, second sub-pixel is+, and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of first sub-pixel wiring is for increasing (" ↑ "), and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of second sub-pixel wiring is for reducing (" ↓ ").In addition, in frame n+1, the polarity of first, second sub-pixel is-, and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of first sub-pixel wiring is for increasing (" ↑ "), and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of second sub-pixel wiring is for reducing (" ↓ ").
In frame n+2, the polarity of first, second sub-pixel is+, and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of first sub-pixel wiring is for reducing (" ↓ "), and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of second sub-pixel wiring is for increasing (" ↑ ").In addition, in frame n+3, the polarity of first, second sub-pixel is-, and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of first sub-pixel wiring is for reducing (" ↓ "), and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of second sub-pixel wiring is for increasing (" ↑ ").
The liquid crystal indicator of present embodiment is the same with the liquid crystal indicator of embodiment 3, because the light and shade of sub-pixel is every two vertical scanning period counter-rotatings, therefore can suppress to show coarse.In addition, the liquid crystal indicator of present embodiment is the same with the liquid crystal indicator of embodiment 3, owing between first polarity epoch and between second polarity epoch, all take place first, the light and shade counter-rotating of second sub-pixel, therefore shown in Figure 31 (b) and Figure 31 (c), in a plurality of vertical scanning period (for example 1～4), the mean value of the mean value of effective voltage VLspa and effective voltage VLspb about equally, by adjusting relative voltage, can make effective voltage VLspa, the mean value of VLspb all is zero, its result can suppress to produce the problem on the reliabilities such as burning screen.
In addition, in Figure 28 (a) for liquid crystal indicator institute reference that embodiment 3 is described, the light and shade and the polarity of the sub-pixel during when supposing reversal of poles in 2～5, with shown in Figure 31 (a) during the light and shade and the polarity of sub-pixel in 1～4 consistent.Thereby in fact the liquid crystal indicator of present embodiment plays the effect identical with the liquid crystal indicator of embodiment 3.
Also have, the liquid crystal indicator of embodiment 3 is under the situation of illustrated the carrying out inversion driving of reference Figure 14 and Figure 15, when the light and shade of sub-pixel 1-a-A, 1-a-B and polarity changed shown in 1～4 during with Figure 31 (a) like that, the light and shade of sub-pixel 2-a-A, 2-a-B and polarity changed shown in 2～5 during with Figure 28 (a) like that.
(embodiment 5)
Below, the 5th embodiment according to liquid crystal indicator of the present invention is described.The liquid crystal indicator 100 of present embodiment is the order of the variation of light and shade, polarity and the effective voltage of the sub-pixel in continuous four vertical scanning period with the difference of above-mentioned liquid crystal indicator.Below in the explanation, for fear of complicated, the repetitive description thereof will be omitted.
With reference to Figure 33, the variation of the light and shade of the sub-pixel in the liquid crystal indicator 100 of present embodiment and polarity is described and the variation of the effective voltage that on the liquid crystal layer of first and second sub-pixels, applies.
Shown in Figure 33 (a), in the liquid crystal indicator 100 of present embodiment, during 1,4,5 be between first polarity epoch, during 2,3,6 be between second polarity epoch.Here, if see four continuous vertical scanning period, then have two to be between first polarity epoch, remaining two is between second polarity epoch.For example, in Figure 33 (a) during 1～4, during 1 and during 4 be between first polarity epoch, during 2 and during 3 be between second polarity epoch.In the liquid crystal indicator 100 of present embodiment, between first polarity epoch, have satisfied | VLspa|〉| during the VLspb| (here 1) and satisfy | VLspa|＜| during the VLspb| (during being here 4).In addition, in liquid crystal indicator 100, between second polarity epoch, have satisfied | VLspa|〉| during the VLspb| (here 2) and satisfy | VLspa|＜| during the VLspb| (during being here 3).
Among Figure 33 (b) and Figure 33 (c), represent effective voltage VLspa, the VLspb of each vertical scanning period of applying on the liquid crystal layer of first, second sub-pixel respectively with thick line.The effective value of the difference of the voltage Vc of the effective voltage VLspa that applies on the liquid crystal layer of first, second sub-pixel, the voltage that VLspb is first, second pixel electrode and comparative electrode, the voltage Vc of represented here comparative electrode fixes.
During in 1, the voltage of first pixel electrode and second pixel electrode all is higher than the voltage of comparative electrode.In addition, the absolute value of the effective voltage that applies on the liquid crystal layer of absolute value greater than second sub-pixel of the effective voltage that applies on the liquid crystal layer of first sub-pixel (| VLspa|〉| VLspb|).Thereby, shown in Figure 33 (a), during 1 be between first polarity epoch, first sub-pixel is brighter than second sub-pixel.
During in 2, the voltage of first pixel electrode and second pixel electrode all is lower than the voltage of comparative electrode.In addition, the absolute value of the effective voltage that applies on the liquid crystal layer of absolute value greater than second sub-pixel of the effective voltage that applies on the liquid crystal layer of first sub-pixel (| VLspa|〉| VLspb|).Thereby, shown in Figure 33 (a), during 2 be between second polarity epoch, and first sub-pixel is brighter than second sub-pixel.
During in 3, the voltage of first pixel electrode and second pixel electrode all is lower than the voltage of comparative electrode.In addition, the absolute value of the effective voltage that applies on the liquid crystal layer of absolute value greater than first sub-pixel of the effective voltage that applies on the liquid crystal layer of second sub-pixel (| VLspa|＜| VLspb|).Thereby, shown in Figure 33 (a), during 3 be between second polarity epoch, second sub-pixel is brighter than first sub-pixel.
During in 4, the voltage of first pixel electrode and second pixel electrode all is higher than the voltage of comparative electrode.In addition, the absolute value of the effective voltage that applies on the liquid crystal layer of absolute value greater than first sub-pixel of the effective voltage that applies on the liquid crystal layer of second sub-pixel (| VLspa|＜| VLspb|).Thereby, shown in Figure 33 (a), during 4 be between first polarity epoch, second sub-pixel is brighter than first sub-pixel.From during 5, the light and shade and the polarity of first, second sub-pixel during the light and shade of first, second sub-pixel and polarity repeat in 1～4.In the liquid crystal indicator of present embodiment, frame frequency is for example 120Hz.
As known from the above, shown in Figure 33 (a), (light and shade, the polarity) of first sub-pixel changes successively with (bright ,+), (bright,-), (dark,-), (dark ,+), and (light and shade, the polarity) of second sub-pixel changes with the order of (dark ,+), (dark,-), (bright,-), (bright ,+).Like this, in the liquid crystal indicator of present embodiment,, and when the counter-rotating of the light and shade of sub-pixel and when staggering a vertical scanning period polarity is reversed every two vertical scanning period every the light and shade of two vertical scanning period inverted rotor pixels.The liquid crystal indicator of present embodiment is different with the liquid crystal indicator of patent documentation 1, because the light and shade of sub-pixel is every two vertical scanning period counter-rotatings, therefore can suppress to show coarse.In addition, the liquid crystal indicator of present embodiment is different with the liquid crystal indicator of patent documentation 2, because between first polarity epoch and the counter-rotating of first, second sub-pixel light and shade all takes place between second polarity epoch, therefore shown in Figure 33 (b) and Figure 33 (c), in a plurality of vertical scanning period (for example 1～4), the mean value of the mean value of effective voltage VLspa and effective voltage VLspb about equally, by adjusting relative voltage, the mean value that can make effective voltage VLspa, VLspb all is zero, its result can suppress to produce the problem on the reliabilities such as burning screen.
Then, with reference to Figure 34, the change in voltage in a plurality of vertical scanning period is described.
Among Figure 34, Vg represents the voltage of sweep trace, Vcsa represents the voltage of first auxiliary capacitor wiring, Vcsb represents the voltage of second auxiliary capacitor wiring, VLspa is illustrated in the effective voltage that applies on the liquid crystal layer of first sub-pixel, and VLspb is illustrated in the effective voltage that applies on the liquid crystal layer of second sub-pixel.Here, the voltage of first, second auxiliary capacitor wiring increases every 10H among the AH during showing or reduces, and is that one-period carries out cyclical variation with 20H.In addition, the voltage of first, second auxiliary capacitor wiring increases every 18H among the BH between first～the 4th the adjustment period or reduces.
Among Figure 35, represent the variation of the voltage of the auxiliary capacitor wiring that begins in the vertical scanning period of the light and shade of first, second sub-pixel and polarity and first, second sub-pixel.Among Figure 35, four continuous frames are expressed as frame n, n+1, n+2, n+3.
As shown in figure 35, in frame n, the polarity of first, second sub-pixel is+, and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of first sub-pixel wiring is for increasing (" ↑ "), and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of second sub-pixel wiring is for reducing (" ↓ ").In addition, in frame n+1, the polarity of first, second sub-pixel is-, and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of first sub-pixel wiring is for reducing (" ↓ "), and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of second sub-pixel wiring is for increasing (" ↑ ").
In frame n+2, the polarity of first, second sub-pixel is-, and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of first sub-pixel wiring is for increasing (" ↑ "), and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of second sub-pixel wiring is for reducing (" ↓ ").In addition, in frame n+3, the polarity of first, second sub-pixel is+, and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of first sub-pixel wiring is for reducing (" ↓ "), and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of second sub-pixel wiring is for increasing (" ↑ ").
As mentioned above, variation according to the voltage of first, second auxiliary capacitor wiring changes the effective voltage that applies on the liquid crystal layer of first, second sub-pixel, (light and shade, the polarity) thereby that makes the sub-pixel of winning changes successively with (bright ,+), (bright,-), (dark,-), (dark ,+), and (light and shade, the polarity) of second sub-pixel changes with the order of (dark ,+), (dark,-), (bright,-), (bright ,+).Therefore, the liquid crystal indicator of present embodiment also can suppress the reduction of display quality in the liquid crystal indicator of the angle of visibility interdependence that improves the γ characteristic.
(embodiment 6)
Below, the 6th embodiment according to liquid crystal indicator of the present invention is described.The liquid crystal indicator 100 of present embodiment is the order of the variation of light and shade, polarity and the effective voltage of the sub-pixel in continuous four vertical scanning period with the difference of above-mentioned liquid crystal indicator.Below in the explanation, for fear of complicated, the repetitive description thereof will be omitted.
With reference to Figure 36, the variation of the light and shade of the sub-pixel in the liquid crystal indicator 100 of present embodiment and polarity is described and the variation of the effective voltage that on the liquid crystal layer of first and second sub-pixels, applies.
Shown in Figure 36 (a), in the liquid crystal indicator 100 of present embodiment, during 1,2,5,6 be between first polarity epoch, during 3,4 be between second polarity epoch.Here, if see four continuous vertical scanning period, then have two to be between first polarity epoch, remaining two is between second polarity epoch.For example, in Figure 36 (a) during 1～4, during 1 and during 2 be between first polarity epoch, during 3 and during 4 be between second polarity epoch.In the liquid crystal indicator 100 of present embodiment, between first polarity epoch, have satisfied | VLspa|〉| during the VLspb| (here 1) and satisfy | VLspa|＜| during the VLspb| (during being here 2).In addition, in liquid crystal indicator 100, between second polarity epoch, have satisfied | VLspa|〉| during the VLspb| (here 4) and satisfy | VLspa|＜| during the VLspb| (during being here 3).
Among Figure 36 (b) and Figure 36 (c), represent effective voltage VLspa, the VLspb of each vertical scanning period of applying on the liquid crystal layer of first, second sub-pixel respectively with thick line.The effective value of the difference of the voltage Vc of the effective voltage VLspa that applies on the liquid crystal layer of first, second sub-pixel, the voltage that VLspb is first, second pixel electrode and comparative electrode, the voltage Vc of represented here comparative electrode fixes.
During in 1, the voltage of first pixel electrode and second pixel electrode all is higher than the voltage of comparative electrode.In addition, the absolute value of the effective voltage that applies on the liquid crystal layer of absolute value greater than second sub-pixel of the effective voltage that applies on the liquid crystal layer of first sub-pixel (| VLspa|〉| VLspb|).Thereby, shown in Figure 36 (a), during 1 be between first polarity epoch, first sub-pixel is brighter than second sub-pixel.
During in 2, the voltage of first pixel electrode and second pixel electrode all is higher than the voltage of comparative electrode.In addition, the absolute value of the effective voltage that applies on the liquid crystal layer of absolute value greater than first sub-pixel of the effective voltage that applies on the liquid crystal layer of second sub-pixel (| VLspa|＜| VLspb|).Thereby, shown in Figure 36 (a), during 2 be between first polarity epoch, second sub-pixel is brighter than first sub-pixel.
During in 3, the voltage of first pixel electrode and second pixel electrode all is lower than the voltage of comparative electrode.In addition, the absolute value of the effective voltage that applies on the liquid crystal layer of first sub-pixel be lower than the effective voltage that applies on the liquid crystal layer of second sub-pixel absolute value (| VLspa|＜| VLspb|).Thereby, shown in Figure 36 (a), during 3 be between second polarity epoch, second sub-pixel is brighter than first sub-pixel.
During in 4, the voltage of first pixel electrode and second pixel electrode all is lower than the voltage of comparative electrode.In addition, the absolute value of the effective voltage that applies on the liquid crystal layer of absolute value greater than second sub-pixel of the effective voltage that applies on the liquid crystal layer of first sub-pixel (| VLspa|〉| VLspb|).Thereby, shown in Figure 36 (a), during 4 be between second polarity epoch, first sub-pixel is brighter than second sub-pixel.From during 5, the light and shade and the polarity of first, second sub-pixel during the light and shade of first, second sub-pixel and polarity repeat in 1～4.
As known from the above, shown in Figure 36 (a), (light and shade, the polarity) of first sub-pixel changes successively with (bright ,+), (dark ,+), (dark,-), (bright,-), and (light and shade, the polarity) of second sub-pixel changes with the order of (dark ,+), (bright ,+), (bright,-), (dark,-).Like this, in the liquid crystal indicator of present embodiment,, and when the light and shade counter-rotating of sub-pixel and under the state of the vertical scanning period that staggers, polarity is reversed every two vertical scanning period every the light and shade of two vertical scanning period inverted rotor pixels.The liquid crystal indicator of present embodiment is identical with the liquid crystal indicator of embodiment 5, because the light and shade of sub-pixel is every two vertical scanning period counter-rotatings, therefore can suppress to show coarse.In addition, the liquid crystal indicator of present embodiment is identical with the liquid crystal indicator of embodiment 5, because between first polarity epoch and the counter-rotating of first, second sub-pixel light and shade all takes place between second polarity epoch, therefore shown in Figure 36 (b) and Figure 36 (c), in a plurality of vertical scanning period (for example 1～4), the mean value of the mean value of effective voltage VLspa and effective voltage VLspb about equally, by adjusting relative voltage, the mean value that can make effective voltage VLspa, VLspb all is zero, its result can suppress to produce the problem on the reliabilities such as burning screen.
Among Figure 37, represent the variation of the voltage of the auxiliary capacitor wiring that begins in the vertical scanning period of the light and shade of first, second sub-pixel and polarity and first, second sub-pixel.Among Figure 37, four continuous frames are expressed as frame n, n+1, n+2, n+3.
As shown in figure 37, in frame n, the polarity of first, second sub-pixel is+, and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of first sub-pixel wiring is for increasing (" ↑ "), and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of second sub-pixel wiring is for reducing (" ↓ ").In addition, in frame n+1, the polarity of first, second sub-pixel is+, and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of first sub-pixel wiring is for reducing (" ↓ "), and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of second sub-pixel wiring is for increasing (" ↑ ").
In frame n+2, the polarity of first, second sub-pixel is-, and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of first sub-pixel wiring is for increasing (" ↑ "), and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of second sub-pixel wiring is for reducing (" ↓ ").In addition, in frame n+3, the polarity of first, second sub-pixel is-, and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of first sub-pixel wiring is for reducing (" ↓ "), and the change in voltage of the auxiliary capacitor that begins in the vertical scanning period of second sub-pixel wiring is for increasing (" ↑ ").
In addition, the light and shade and the polarity of the sub-pixel during in Figure 36 (a) under the situation of hypothesis transposing first sub-pixel and second sub-pixel in 2～5, with shown in the Figure 33 (a) of the reference for embodiment 5 is described during the light and shade and the polarity of sub-pixel in 1～4 consistent.Thereby when the display area of first pixel electrode equated with the display area of second pixel electrode, in fact the liquid crystal indicator of present embodiment played the effect identical with the liquid crystal indicator of embodiment 5.
Also have, the liquid crystal indicator of embodiment 6 is under the situation of illustrated the carrying out inversion driving of reference Figure 14 and Figure 15, when the light and shade of sub-pixel 1-a-A, 1-a-B and polarity changed shown in 1～4 during with Figure 36 (a) like that, the light and shade of sub-pixel 2-a-A, 2-a-B and polarity changed shown in 2～5 during with Figure 33 (a) like that.
(embodiment 7)
Below, the 7th embodiment according to liquid crystal indicator of the present invention is described.The liquid crystal indicator 100 of present embodiment is that with the difference of the liquid crystal indicator of embodiment 1～6 brightness of sub-pixel changes by intermediate luminance.Below in the explanation, for fear of complicated, the repetitive description thereof will be omitted.
With reference to Figure 38, the variation of the light and shade of the sub-pixel in the liquid crystal indicator 100 of present embodiment and polarity is described and the variation of the effective voltage that on the liquid crystal layer of first and second sub-pixels, applies.Shown in Figure 38 (a), in the liquid crystal indicator 100 of present embodiment, during 1,3,5 be between first polarity epoch, during 2,4,6 be between second polarity epoch.Here, if see four continuous vertical scanning period, then have two to be between first polarity epoch, remaining two is between second polarity epoch.For example, during in 1～4, during 1 and during 3 be between first polarity epoch, during 2 and during 4 be between second polarity epoch.In addition, satisfied between first polarity epoch | VLspa|〉| during the VLspb| (during being here 1) and satisfy | VLspa
During |＜| the VLspb| (during being here 3), VLspa and (during 2 and 4) during VLspb equates between second polarity epoch.
Among Figure 38 (b) and Figure 38 (c), represent effective voltage VLspa, the VLspb of each vertical scanning period of applying on the liquid crystal layer of first, second sub-pixel respectively with thick line.The effective value of the difference of the voltage Vc of the effective voltage VLspa that applies on the liquid crystal layer of first, second sub-pixel, the voltage that VLspb is first, second pixel electrode and comparative electrode, the voltage Vc of represented here comparative electrode fixes.
During in 1, the voltage of first pixel electrode and second pixel electrode all is higher than the voltage of comparative electrode.In addition, the absolute value of the effective voltage that applies on the liquid crystal layer of absolute value greater than second sub-pixel of the effective voltage that applies on the liquid crystal layer of first sub-pixel (| VLspa|〉| VLspb|).Thereby, shown in Figure 38 (a), during 1 be between first polarity epoch, first sub-pixel is brighter than second sub-pixel.
During in 2, the voltage of first pixel electrode and second pixel electrode all is lower than the voltage of comparative electrode.In addition, the effective voltage that applies on the liquid crystal layer of the effective voltage that applies on the liquid crystal layer of first sub-pixel and second sub-pixel equates (VLspa=VLspb).Thereby, shown in Figure 38 (a), during 2 be between second polarity epoch, the brightness of first sub-pixel equates with the brightness of second sub-pixel.
During in 3, the voltage of first pixel electrode and second pixel electrode all is higher than the voltage of comparative electrode.In addition, the absolute value of the effective voltage that applies on the liquid crystal layer of absolute value greater than first sub-pixel of the effective voltage that applies on the liquid crystal layer of second sub-pixel (| VLspa|＜| VLspb|).Thereby, shown in Figure 38 (a), during 3 be between first polarity epoch, second sub-pixel is brighter than first sub-pixel.
During in 4, the voltage of first pixel electrode and second pixel electrode all is lower than the voltage of comparative electrode.In addition, the effective voltage that applies on the liquid crystal layer of the effective voltage that applies on the liquid crystal layer of first sub-pixel and second sub-pixel equates (VLspa=VLspb).Thereby, shown in Figure 38 (a), during 4 be between second polarity epoch, the brightness of first sub-pixel equates with the brightness of second sub-pixel.From during 5, the light and shade and the polarity of first, second sub-pixel during the light and shade of first, second sub-pixel and polarity repeat in 1～4.
As known from the above, shown in Figure 38 (a), (light and shade, the polarity) of first sub-pixel changes successively with (bright ,+), (in,-), (dark ,+), (in,-), and (light and shade, the polarity) of second sub-pixel changes with the order of (dark ,+), (in,-), (bright ,+), (in,-).Here, " in " represent that the brightness of first sub-pixel and the brightness of second sub-pixel equate.Like this, in the liquid crystal indicator of present embodiment, make the brightness of sub-pixel be three phase change by intermediate luminance, and polarity is reversed every vertical scanning period every vertical scanning period.
In the liquid crystal indicator of present embodiment, because therefore the counter-rotating of the light and shade of sub-pixel can suppress to show coarse.In addition, the liquid crystal indicator of present embodiment is shown in Figure 38 (b) and Figure 38 (c), in a plurality of vertical scanning period (for example 1～4), the mean value of the mean value of effective voltage VLspa and effective voltage VLspb about equally, by adjusting relative voltage, the mean value that can make effective voltage VLspa, VLspb all is zero, and its result can suppress to produce the problem on the reliabilities such as burning screen.
Then, on one side with reference to Figure 39 A, Figure 39 B and Figure 40, the variation of the effective voltage that applies on the liquid crystal layer of the sub-pixel in the liquid crystal indicator of present embodiment is described on one side.Below in the explanation, establish continuous four frames (vertical scanning period) and be frame n, n+1, n+2, n+3.
Among Figure 39 A, be illustrated in the light and shade and the polarity of each sub-pixel that changes among the frame n, among Figure 39 B, be illustrated in the light and shade and the polarity of each sub-pixel that changes among the frame n+1.The pixel that the liquid crystal indicator of present embodiment has shown in Figure 39 A and Figure 39 B is arranged, and this arranges identical with the pixel that illustrates in the liquid crystal indicator of embodiment 1 with reference to Figure 14.Thereby, for fear of the overcomplicated of explanation, omit repeat specification.In addition, be provided with 12 auxiliary capacitor branch lines in the liquid crystal indicator of present embodiment, among Figure 39 A and Figure 39 B, the auxiliary capacitor that will be connected wiring with 12 auxiliary capacitor branch lines be expressed as respectively CS1, CS2, CS3 ... CS12.
As illustration, the light and shade of the sub-pixel that comprises among pixels illustrated 1-a, 1-b, 2-a, the 2-b and the variation of polarity.In frame n, shown in Figure 39 A, the polarity of pixel 1-a and pixel 2-b is first polarity (+), and the polarity of pixel 1-b and pixel 2-a is second polarity (-).Sub-pixel 1-a-A, 1-b-B, 2-a-A, 2-b-B are bright than other sub-pixel.Then, in frame n+1, shown in Figure 39 B, each sub-pixel becomes intermediate luminance, and the reversal of poles of each sub-pixel is opposite during with frame n.Then, in frame n+2, the reversal of poles of each sub-pixel is opposite during with frame n+1, identical with shown in Figure 39 A, and the light and shade of sub-pixel is reversed to opposite with shown in Figure 39 A.Then, in frame n+3, identical with shown in Figure 39 B, each sub-pixel becomes intermediate luminance, and the polarity of each sub-pixel also is reversed to and identical polarity shown in Figure 39 B.
Here, for the liquid crystal indicator of present embodiment, the situation that satisfies above-mentioned three conditions in order to suppress to glimmer is described.
In addition, the liquid crystal indicator of present embodiment is identical with the liquid crystal indicator of the embodiment 1 that illustrates with reference to Figure 15, by the voltage of suitable each signal wire of setting and the voltage of comparative electrode, make that the effective voltage that on each direction of an electric field liquid crystal layer is applied is consistent as much as possible, thereby satisfy first condition.In addition, the liquid crystal indicator of present embodiment shown in Figure 39 A and Figure 39 B, the pixel that disposed adjacent polarity is different, thus satisfy second condition.Also have, in the liquid crystal indicator of present embodiment, the unordered as much as possible configuration of the sub-pixel brighter than other sub-pixel is specifically shown in Figure 39 A, the mark of " bright " and " secretly " is that unit is configured to checkerboard with the sub-pixel, thereby satisfies the 3rd condition.
In the table 2, the display quality of liquid crystal indicator when frame frequency changes of expression embodiment 1, embodiment 3 and present embodiment.In the table 2, the usefulness that display quality is good " zero " expression, usefulness " * " expression of display quality difference.As shown in table 2, for the liquid crystal indicator of present embodiment,, then can obtain good display quality if make frame frequency more than 90Hz.
[table 2]
Frame frequency 50Hz 60Hz 75Hz 90Hz 120Hz
Embodiment 1 (with reference to Fig. 6) angle of visibility improves the coarse flicker of effect (Flicker) reliability embodiment 3 (with reference to Figure 28) angle of visibility and improves the coarse flicker of effect (Flicker) reliability ○ ○ ○ ○ ×○ ○ ○ ○ ○× ○ ○ ○ ○○ ○ ○ ○ ○○ ○ ○ ○ ○○ ○ ○ ○ ○× × × × ○○ ○ ○ ○ ○
Embodiment 7 (with reference to Figure 38) angle of visibility improves the coarse flicker of effect (Flicker) reliability ○ ○ ○ ○ ○○ ○ ○ ○ ○× × × ○ ○○ ○ ○ ○ ○
With reference to Figure 40, for sub-pixel 1-a-A, the 1-a-B that with dashed lines among Figure 39 A and Figure 39 B surrounds, line voltage signal in the liquid crystal indicator of present embodiment, first, second auxiliary capacitor branch line voltage, sweep trace voltage are described and the sub-pixel liquid crystal layer that changes according to the change in voltage of first, second auxiliary capacitor branch line on the variation of the effective voltage that applies.Among Figure 40, Vsa represents the voltage of signal wire Sa, Vsb represents the voltage of signal wire Sb, Vcs1 represents the voltage of the first auxiliary capacitor branch line CS1, Vcs2 represents the voltage of the second auxiliary capacitor branch line CS2, Vg1 represents the voltage of sweep trace G1, and VLsp1-a-A, VLsp1-a-B represent the effective voltage that applies on the liquid crystal layer of sub-pixel 1-a-A, 1-a-B.
Among Figure 40, represented each voltage waveform in four frame n～n+3, as reference Figure 38, Figure 39 A and Figure 39 B are illustrated, the brightness that makes on one side sub-pixel 1-a-A with (bright, in, dark, in) change, the brightness that makes sub-pixel 1-a-B with (dark, in, bright, in) change, make on one side separately polarity with (+,-,+,-) reverse.The write activity of each frame becomes the moment of VgH (high level) from the voltage Vg1 of sweep trace G1.A vertical scanning period (V-Total) of received image signal is 801H.In addition, the voltage Vcs1 of the first auxiliary capacitor branch line CS1 is the waveform that alternately switches to first level (VL1), second level (VL2), the 3rd level (VL3), second level (VL2) every 6H, and voltage Vcs1 and voltage Vcs2 have 180 ° phase differential each other.
Among Figure 40, from the voltage Vg1 of sweep trace G1 become VgL (low level), till the level initial change of voltage Vcs1, the Vcs2 of auxiliary capacitor wiring during be 3H.The cycle of (during first waveform) is 24H during the demonstration of the voltage Vcs1 of the first auxiliary capacitor branch line CS1, since amplitude be certain value (first level, second level and the 3rd level) during be respectively 6H, therefore, 3H be equivalent to the amplitude of the voltage Vcs of auxiliary capacitor wiring be certain value during half (=four/one-period in during showing during).
In frame n, n+2, when sweep trace G1 was selected, the voltage Vsa of signal wire Sa was higher than the voltage of comparative electrode.In addition, in frame n+1, n+3, when sweep trace G1 was selected, the voltage Vsa of signal wire Sa was lower than the voltage of comparative electrode.
Below, with reference to Figure 40, sub-pixel 1-a-A, the 1-a-B of pixels illustrated 1-a is in light and shade and the polarity of frame n～frame n+3.
In frame n, the voltage Vcs1 of the first auxiliary capacitor branch line when second level descends and maintain first level, sweep trace G1 selected (sweep trace voltage Vg becomes VgH).If sweep trace G1 is selected, then the pixel electrode to sub-pixel 1-a-A, 1-a-B applies the voltage that is higher than comparative electrode voltage.After the voltage Vg1 of sweep trace G1 gets back to VgL, the voltage Vcs1 cyclical variation of the first auxiliary capacitor branch line.The voltage Vcs1 of the first auxiliary capacitor branch line of the voltage Vg1 of sweep trace G1 when VgH gets back to VgL is VL1, and the voltage Vcs2 of the second auxiliary capacitor branch line is VL3.Because the average voltage of voltage Vcs1, the Vcs2 of first, second auxiliary capacitor branch line is that VL2 is higher than VL1, is lower than VL3, therefore the absolute value of the effective voltage that the liquid crystal layer of sub-pixel 1-a-A is applied is greater than the absolute value of the effective voltage that the liquid crystal layer to sub-pixel 1-a-B applies.Thereby sub-pixel 1-a-A is brighter than sub-pixel 1-a-B.
Then, in frame n+1, the voltage Vcs1 of the first auxiliary capacitor branch line when the 3rd level descends and maintain second level, sweep trace G1 selected (sweep trace voltage Vg becomes VgH).If sweep trace G1 is selected, then the pixel electrode to sub-pixel 1-a-A, 1-a-B applies the voltage that is lower than comparative electrode voltage.After the voltage Vg1 of sweep trace G1 gets back to VgL, the voltage Vcs1 cyclical variation of the first auxiliary capacitor branch line.When the voltage Vg1 of sweep trace G1 got back to VgL, voltage Vcs1, the Vcs2 of first, second auxiliary capacitor branch line was the identical VL2 of average voltage with voltage Vcs1, the Vcs2 of first, second auxiliary capacitor branch line.Therefore, the absolute value of the effective voltage that the liquid crystal layer of sub-pixel 1-a-A is applied equates with the absolute value of the effective voltage that the liquid crystal layer to sub-pixel 1-a-B applies, thereby the brightness of sub-pixel 1-a-A equates with the brightness of sub-pixel 1-a-B.
Then, in frame n+2, the voltage Vcs1 of the first auxiliary capacitor branch line is during from second electrical level rising to the, three level, sweep trace G1 selected (sweep trace voltage Vg becomes VgH).If sweep trace G1 is selected, then the pixel electrode to sub-pixel 1-a-A, 1-a-B applies the voltage that is higher than comparative electrode voltage.Because the voltage Vcs1 of the voltage Vg1 of the sweep trace G1 first auxiliary capacitor branch line when VgH gets back to VgL is VL3, therefore the voltage Vcs2 of the second auxiliary capacitor branch line is VL1, and the absolute value of the effective voltage that the liquid crystal layer of sub-pixel 1-a-A is applied is less than the absolute value of the effective voltage that the liquid crystal layer to sub-pixel 1-a-B applies.Thereby sub-pixel 1-a-A is darker than sub-pixel 1-a-B.
Then, in frame n+3, the voltage Vcs1 of the first auxiliary capacitor branch line from first electrical level rising behind second level, sweep trace G1 selected (sweep trace voltage Vg becomes VgH).If sweep trace G1 is selected, then the pixel electrode to sub-pixel 1-a-A, 1-a-B applies the voltage that is lower than comparative electrode voltage.Because voltage Vcs1, the Vcs2 of the voltage Vg1 of sweep trace G1 first, second auxiliary capacitor branch line when VgH gets back to VgL are VL2, therefore, the absolute value of the effective voltage that the liquid crystal layer of sub-pixel 1-a-A is applied equates with the absolute value of the effective voltage that the liquid crystal layer to sub-pixel 1-a-B applies, thereby the brightness of sub-pixel 1-a-A equates with the brightness of sub-pixel 1-a-B.
From the explanation of reference Figure 40 as can be known, (light and shade, the polarity) of sub-pixel 1-a-A changes successively with (bright ,+), (in,-), (dark ,+), (in,-), and (light and shade, the polarity) of sub-pixel 1-a-B changes with the order of (dark ,+), (in,-), (bright ,+), (in,-).In addition, though not shown here, (light and shade, the polarity) of sub-pixel 2-a-A changes successively with (bright,-), (in ,+), (dark,-), (in ,+).Like this, in the liquid crystal indicator of present embodiment, the light and shade that makes sub-pixel every vertical scanning period with bright, in, dark, in and change, polarity is reversed every vertical scanning period, thereby can suppress to show coarse.In addition, the liquid crystal indicator of present embodiment is identical with the liquid crystal indicator of embodiment 1, because between first polarity epoch and all have between second polarity epoch first sub-pixel than second sub-pixel bright during, therefore shown in Figure 38 (b) and Figure 38 (c), in a plurality of vertical scanning period (for example 1～4), the mean value of the mean value of effective voltage VLspa and effective voltage VLspb about equally, by adjusting relative voltage, can make effective voltage VLspa, the mean value of VLspb all is zero, its result can suppress to produce the problem on the reliabilities such as burning screen.
In addition, in the liquid crystal indicator of above-mentioned embodiment 1～7, the quantity that constitutes the sub-pixel of a pixel is two, but the invention is not restricted to this, and the quantity of sub-pixel also can be more than three.Along with the increase of sub-pixel quantity, the effect of improving the side-play amount of γ characteristic increases.By the pixel segmentation number is increased to 4 from 2, can further improve display quality so that the variation of the side-play amount that changes for display gray scale becomes smooth.But it is many more to cut apart number, and the transmissivity when showing in vain (front) is low more.Especially when cutting apart number when 2 are increased to 4, the transmissivity when showing in vain significantly reduces.The display area that this significantly reduced main cause is a sub-pixel significantly reduces.Consider the γ characteristic the angle of visibility interdependence improve effect and white the demonstration time transmissivity, as long as according to the purposes of liquid crystal indicator etc., suitably adjust and cut apart number and get final product.In addition, what improve most pronounced effects is that pixel does not have when cutting apart and pixel two difference of (sub-pixel is 2 a situation) when cutting apart, if transmissivity and production when considering white the demonstration reduce along with the increase of sub-pixel quantity, then the quantity of the sub-pixel of each pixel is preferably two.
In addition, as the explanation that reference Figure 13 and Figure 14 carry out, also can adopt the structure that voltage Vcs independently is provided to each wiring of auxiliary capacitor wiring.In this case, can obtain to show during and the adjustment period between in the advantage that increases of the waveform selectivity of voltage Vcs.But the voltage from sweep trace in a vertical scanning period is low level, and voltage Vcs must carry out at least once above level and change.Also for example, in the wiring of the auxiliary capacitor of the 2 multiple amounts that possess sweep trace and provide independently in the liquid crystal indicator of structure of voltage Vcs to each auxiliary capacitor wiring respectively, from the voltage of sweep trace is that low level is only carried out under the situation that the level of primary voltage Vcs changes, hope is in a vertical scanning period, with sweep trace voltage is that low level begins to change the back to the time till sweep trace voltage is high level next time to the level that voltage Vcs carries out time till level changes or voltage Vcs, is set at equal for all demonstration provisional capitals.
On the other hand, if adopt the structure that each branch line of many auxiliary capacitor branch lines is provided with many auxiliary capacitor wirings respectively, then can obtain to make the correct consistent advantage of amplitude of oscillation of the voltage Vcs of these many auxiliary capacitor wirings that connect with an auxiliary capacitor branch line.Certainly, compare, can also obtain to simplify the advantage of circuit structure with a plurality of independently voltages are provided.
And, in the liquid crystal indicator of above-mentioned embodiment 1～7, adopted many image element driving methods of record in the patent documentation 1, thereby promptly made the different mode of brightness of two sub-pixels that constitute a pixel, but the present invention is not limited to this by the voltage that the CS bus is applied square wave.
Main points of the present invention are following 2 points, satisfy this embodiment of 2 and are not limited to above-mentioned embodiment.
First main points of the present invention are, by switching the brightness of the sub-pixel that constitutes a pixel, the time of optimizing each sub-pixel brightness changes, and making the brightness equalization of each sub-pixel within a certain period of time, and make the luminance difference between sub-pixel be approximately zero
Second main points of the present invention are, carry out the reversal of poles of sub-pixel, make voltage mean value within a certain period of time that each sub-pixel is applied for all sub-pixels all about equally, thereby optimize the variation (brightness variation) of the effective voltage that liquid crystal layer is applied.In addition, from the viewpoint of reliability, the difference of the average effective voltage between sub-pixel is preferably below the 1V.
Example as the liquid crystal indicator that satisfies above-mentioned two main points, following example is arranged:, contain (bright ,+), (bright,-), (dark ,+), (dark,-) of same amount during certain to four frames that combination has been carried out in the brightness (bright, dark) of polarity of pixel (+,-) and sub-pixel.In addition, as other liquid crystal indicator, have in the structure of intermediate luminance, during certain, contain four frames of (bright ,+), (dark ,+) of same amount and (in,-), (in,-) or (bright,-), (secretly,-) and (in,-), (in,-) with light and shade.
In order to satisfy above-mentioned main points, be not limited to the liquid crystal indicator of above-mentioned embodiment 1～7, also can be to the polarity and the brightness of every frame control sub-pixel.For example, also can be the liquid crystal indicator that the TFT element of each sub-pixel drives with independently data-signal, sweep signal each sub-pixel.
In addition, liquid crystal indicator of the present invention also can be as shown in figure 25, be the TFT element of each sub-pixel to each sub-pixel with data-signal control brightness independently and the liquid crystal indicator that drives by public sweep trace.In this case, by the brightness and the polarity of sub-pixel are provided with data-signal independently, can control the brightness and the polarity of each sub-pixel.
Perhaps, liquid crystal indicator of the present invention also can be that the TFT element of each sub-pixel utilizes public data-signal control brightness, and liquid crystal indicator by another scanning line driving to each sub-pixel.In this case, by the time of a frame is cut apart again, utilize data-signal that brightness and the polarity corresponding with each sub-pixel is provided, in each sub-pixel, set the sweep time or the moment (in a frame, carrying out timesharing), thereby can control the brightness and the polarity of each sub-pixel.
In addition, in order to carry out reference, quote disclosure in this instructions as the Japanese patent application 2006-228476 of the application's basis application and associated Japanese patent application 2006-228475.
Industrial practicality
According to the present invention, provide the liquid crystal display device of the high large-scale or high-resolution of a kind of display quality of angle, the visual field interdependence of having improved the γ characteristic. Liquid crystal display device of the present invention is suitable for use as and is for example large-scale tv receiver more than 30 types.

Claims (20)

1. a liquid crystal indicator possesses a plurality of pixels that comprise first sub-pixel and second sub-pixel respectively, it is characterized in that,
Having respectively separately of described first sub-pixel and described second sub-pixel: comparative electrode; Pixel electrode; And the liquid crystal layer that between described comparative electrode and described pixel electrode, disposes,
The described pixel electrode separately of described first sub-pixel and described second sub-pixel is respectively first pixel electrode and second pixel electrode, and the described comparative electrode separately of described first sub-pixel and described second sub-pixel is public unitary electrode,
When the middle gray of being scheduled in continuous even number vertical scanning period more than four shows, at least two vertical scanning period in described even number vertical scanning period, described first sub-pixel is different with the brightness of described second sub-pixel, each sub-pixel for described first sub-pixel and described second sub-pixel, polarity in described even number vertical scanning period is the length between first polarity epoch of first polarity, and polarity is the equal in length between second polarity epoch of second polarity, in during between described first polarity epoch and between described second polarity epoch each, the mean value of the effective voltage that the described liquid crystal layer of described first sub-pixel is applied, the difference of the mean value of the effective voltage that applies with described liquid crystal layer to described second sub-pixel is actual to be zero.
2. liquid crystal indicator as claimed in claim 1 is characterized in that,
In each pixel of described a plurality of pixels, if setting the effective voltage that the described liquid crystal layer to described first sub-pixel applies is VLspa, the effective voltage that the described liquid crystal layer of described second sub-pixel is applied is VLspb, in then continuous four vertical scanning period, it is between described first polarity epoch that two vertical scanning period are arranged, two remaining vertical scanning period are between described second polarity epoch
Between described first polarity epoch and in described two vertical scanning period of at least one side between described second polarity epoch, one of them satisfies | VLspa|〉| VLspb|, another satisfies | VLspa|＜| VLspb|.
3. liquid crystal indicator as claimed in claim 1 is characterized in that,
In each pixel of described a plurality of pixels, if setting the effective voltage that the described liquid crystal layer to described first sub-pixel applies is VLspa, the effective voltage that the described liquid crystal layer of described second sub-pixel is applied is VLspb, in then continuous four vertical scanning period, it is between described first polarity epoch that two vertical scanning period are arranged, two remaining vertical scanning period are between described second polarity epoch
Between described first polarity epoch and the V|Lspa| value of a vertical scanning period in described two vertical scanning period of at least one side between described second polarity epoch and | VLspb| value, respectively with another vertical scanning period | the VLspb| value with | the VLspa| value equates.
4. as claim 2 or 3 described liquid crystal indicators, it is characterized in that,
In described four vertical scanning period, satisfy | VLspa|〉| the quantity of the vertical scanning period of VLspb| is with satisfied | VLspa|＜| the quantity of the vertical scanning period of VLspb| equates.
5. as each the described liquid crystal indicator in the claim 1～4, it is characterized in that,
Described a plurality of pixel is configured to rectangular on a plurality of line directions and a plurality of column direction,
In each pixel of described a plurality of pixels, described first sub-pixel and described second sub-pixel dispose along described column direction.
6. as each the described liquid crystal indicator in the claim 1～5, it is characterized in that,
In each pixel of described a plurality of pixels, the voltage of described first pixel electrode and described second pixel electrode changes according to the change in voltage of the auxiliary capacitor wiring of correspondence.
7. liquid crystal indicator as claimed in claim 6 is characterized in that,
In each pixel of described a plurality of pixels, change to different directions with the voltage of the corresponding auxiliary capacitor of described first pixel electrode wiring with the voltage of the corresponding auxiliary capacitor wiring of described second pixel electrode.
8. as each the described liquid crystal indicator in the claim 5～7, it is characterized in that,
The voltage of described second pixel electrode of a certain pixel in described a plurality of pixel and with the voltage of described a certain pixel described first pixel electrode of adjacent pixels on described column direction, change according to the change in voltage of public auxiliary capacitor wiring.
9. as each the described liquid crystal indicator in the claim 5～7, it is characterized in that,
The voltage of described second pixel electrode of a certain pixel in described a plurality of pixel and with the voltage of described a certain pixel described first pixel electrode of adjacent pixels on described column direction, change according to the change in voltage of the auxiliary capacitance wiring of difference.
10. as each the described liquid crystal indicator in the claim 1～9, it is characterized in that,
In each pixel of described a plurality of pixels, described first pixel electrode is connected to the signal wire and the same signal line of described second sub-pixel by the on-off element of correspondence.
11. each the described liquid crystal indicator as in the claim 1～5 is characterized in that,
In each pixel of described a plurality of pixels, described first pixel electrode is connected with first signal wire by first on-off element, and described second pixel electrode is connected with the secondary signal line by the second switch element.
12. each the described liquid crystal indicator as in the claim 1～11 is characterized in that,
In described two vertical scanning period during between described first polarity epoch and between described second polarity epoch each, one of them is satisfied | VLspa|〉| the vertical scanning period of VLspb|, another is satisfied | VLspa|＜| the vertical scanning period of VLspb|.
13. each the described liquid crystal indicator as in the claim 1～12 is characterized in that,
In each pixel of described a plurality of pixels, every the counter-rotating of vertical scanning period | VLspa| and | the magnitude relationship of VLspb|, and every the reverse polarity of described first sub-pixel and described second sub-pixel of two vertical scanning period.
14. each the described liquid crystal indicator as in the claim 1～13 is characterized in that,
Frame frequency is 60Hz.
15. each the described liquid crystal indicator as in the claim 1～12 is characterized in that,
In each pixel of described a plurality of pixels, every the counter-rotating of two vertical scanning period | VLspa| and | the magnitude relationship of VLspb|, and every the reverse polarity of described first sub-pixel and described second sub-pixel of a vertical scanning period.
16. liquid crystal indicator as claimed in claim 15 is characterized in that,
Frame frequency is 120Hz.
17. each the described liquid crystal indicator as in the claim 1～12 is characterized in that,
In each pixel of described a plurality of pixels, every the counter-rotating of two vertical scanning period | VLspa| and | the magnitude relationship of VLspb|, and every the reverse polarity of described first sub-pixel and described second sub-pixel of two vertical scanning period,
With different moment in the moment of the reversal of poles of described first sub-pixel and described second sub-pixel, carry out | the VLspa| and | the counter-rotating of the magnitude relationship of VLspb|.
18. each the described liquid crystal indicator as in the claim 1～11 is characterized in that,
Wherein in described two vertical scanning period of a side, one of them is satisfied between described first polarity epoch and between described second polarity epoch | VLspa|〉| the vertical scanning period of VLspb|, another is satisfied | VLspa|＜| the vertical scanning period of VLspb|,
Between described first polarity epoch and in during each of described two vertical scanning period of the opposing party between described second polarity epoch, VLspa equates with VLspb.
19. liquid crystal indicator as claimed in claim 18 is characterized in that,
The voltage of the auxiliary capacitor corresponding with described first pixel electrode and described second pixel electrode wiring is higher than between second level of described first level and the 3rd level that voltage is higher than described second level at first level, voltage and changes.
20. each the described liquid crystal indicator as in the claim 1～19 is characterized in that,
Described first pixel electrode has the display area that equates with described second pixel electrode.
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