CN101276078B - Liquid crystal display device - Google Patents

Liquid crystal display device Download PDF

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Publication number
CN101276078B
CN101276078B CN2008100907600A CN200810090760A CN101276078B CN 101276078 B CN101276078 B CN 101276078B CN 2008100907600 A CN2008100907600 A CN 2008100907600A CN 200810090760 A CN200810090760 A CN 200810090760A CN 101276078 B CN101276078 B CN 101276078B
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liquid crystal
light
pixel
frame
sub
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CN101276078A (en
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关根裕之
益村和敬
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Tianma Japan Ltd
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NEC LCD Technologies Ltd
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Abstract

The purpose of the invention is to reduce flickers generated in a liquid crystal display device for allowing the use of a liquid crystal material exhibiting a high response speed so as to improve the light utilizing efficiency of a field sequential type liquid crystal display device. A liquid crystal display device includes: a display panel including a pixel matrix in which pixels each including a switching element and a pixel electrode are arranged in matrix near intersection of data lines and gate lines, and a counter electrode arranged to oppose the pixel matrix; and a control part which divides a period for displaying a color image of one frame into a plurality of sub-frame periods, and lights up light sources of different colors for each of the sub-frame periods to display images on the display panel. A shield electrode layer separated by an insulating film is disposed between the pixel electrode and the data lines.

Description

Liquid crystal display device
The cross reference of related application
The application based on and require the right of priority of Japanese patent application No.2007-086188 that submitted on March 29th, 2007 and the Japanese patent application No.2008-057377 that submitted on March 7th, 2008, be incorporated herein its full content with as a reference.
Background of invention
1. invention field
The present invention relates to a kind of liquid crystal display device.
2. the description of prior art
The active-matrix liquid crystal display device that comprises thin film transistor (TFT) (TFT) at each pixel place can be with higher picture quality display video, thereby makes many this type of display devices be used for display, projector light valve of slim TV, portable terminal device etc.
This liquid crystal display device that is used for slim TV and portable terminal device generally has the structure shown in Figure 42.In this liquid crystal display device, for color display, a pixel is divided into three subpixel, and the color filter of redness (R) 171, green (G) 172 and blueness (B) 173 is set to subpixel respectively.By gate drivers 174 raster polar curves 177, vision signal is provided for data line 178 by data driver 175, thereby selects pixel, to drive corresponding liquid crystal, realize colored the demonstration thus.
Simultaneously, the light valve that is used for liquid crystal projection apparatus has following structure, and promptly wherein each pixel forms monolithic, as shown in Figure 43.In the liquid crystal display device that constitutes this light valve color filter is not set, single pixel is not divided into a plurality of subpixel yet.This be because, in general projector, use red (R), green (G) and the next light of blue (B) three light valves corresponding to three primary colours, by gate drivers 184 raster polar curves 187, vision signal is provided for data line 188 by data driver 185, thereby drives the liquid crystal of each pixel.
Figure 44 has shown the structure of the three template liquid crystal projection apparatus that use this three light valves.As shown in this Fig, by dichronic mirror 192 separation such as grade, and shine each light valve 194-196 by catoptron 193 from the light of illuminator 191.It is synthetic that the light of transmission is synthesized prism 198, thereby form coloured image, and carry out Projection Display by projecting lens 199.Since this structure, thus color filter is set needn't for each light valve 194-196, as shown in Figure 43.As described with reference to Figure 42 before, using color filter to carry out single pixel to be divided into three subpixel in the colored liquid crystal display device that shows.Thereby when the resolution of liquid crystal display device improved, the area of each subpixel reduced.This can cause numerical aperture to reduce, and finally causes optical loss.In addition, three template liquid crystal projection apparatus shown in Figure 44 need three light valves, thereby its cost uprises, and can not form this device with less size.
As the measure that overcomes this problem, in Japanese Unexamined Patent Application 2001-318363 (patent documentation 1), a kind of continuous type liquid crystal display device described.
Field continuous type liquid crystal display device is following a kind of system, be that it shows that with liquid crystal display device the time of a screen video is divided into three cycles, in each cycle, show corresponding to red (R), the video of green (G) and blue (B), and switch the color of the light that shines liquid crystal display device, thereby obtain colored the demonstration with audio video synchronization ground.
Figure 45 has shown the structure of existing continuous type liquid crystal display device.In this liquid crystal display device, be provided with pixel at the data line 198 of vertical and horizontal setting and each the intersection point place between the gate line 197.Outer periphery in PEL matrix is equipped with data driving circuit 195 that is used for driving data lines and the gate driver circuit 194 that is used for the driving grid line.In addition, at each pixel place of this liquid crystal display device color filter is not set all.Yet although do not illustrate, it is provided with and is used to the backlight of liquid crystal display device of throwing light on.This is backlight to have and lights three primary colours separately, i.e. red (R), the function of the light source of green (G) and blueness (B).
Below the operation of liquid crystal display device will be described by the sequential chart of reference Figure 46.Be used in liquid crystal display device wherein show that the frame period Tf of a screen video is divided into period of sub-frame Tsf_r, Tsf_g and Tsf_b.
In period of sub-frame Tsf_r, show the operation of redness (R) video at each pixel place of LCD.At first, gate lines G 1 is made as high level.Synchronous therewith, vision signal writes data line D1-D10.Thus, vision signal writes each pixel on the pixel rows that is connected with gate lines G 1.By all gate lines G 1-G8 are carried out this operation, red (R) vision signal is written to all pixels.
After writing redness (R) vision signal to all pixels, after the certain latent period of process, red (R) light source is lighted.Thus, redness (R) video in the liquid crystal display device display color video.Here LED_R represents to be used for a shiny red (R) control signal for light source.In the same way, in Tsf_g, show green (G) video, in Tsf_b, show blue (B) video.Thus, the beholder is in time with the blend of colors of these videos, thereby it is considered as color video.
The liquid crystal material that is used for this continuous type need show high response speed.For T1 among Figure 46 and T8, T1 has shown the transmission change of the pixel that is connected with gate lines G 1, and T8 has shown the transmission change of the pixel that is connected with gate lines G 8.Latent period must be made as the transmission change that can make T8 and become enough little time span.
If latent period is too short, still continuing the time point bright light source in the transmission change of T8, even what then show on whole screen is identical brightness, between the brightness on the screen, also can create a difference.Simultaneously, long if latent period is provided with, then the time of lighting of light source becomes too short, causes showing darker thus.Therefore, for field continuous type liquid crystal display device, need to use the liquid crystal material that in period of sub-frame, to make abundant response.
As mentioned above, a continuous type liquid crystal display device needs to show the liquid crystal material than high response speed.Yet, different with color filter type liquid crystal display device, will not be divided into redness (R) by each pixel, green (G) and blue (B) three subpixel.Thereby numerical aperture is bigger, thereby has improved the utilization ratio of light.In addition, when used for liquid crystal display device during, can only use single light valve to realize colored the demonstration in liquid crystal projection apparatus.This provides the advantage that can reduce device size.
Yet,, on screen, produce flicker (flicker of screen) easily for above-mentioned field continuous type liquid crystal display device.As mentioned above, but continuous type liquid crystal display device uses the liquid crystal material of high-speed response.Thereby even when only producing slight potential fluctuation in the voltage at pixel, the transmissivity of pixel also can fluctuate.
Figure 47 has shown the equivalent circuit of the single pixel of a continuous type liquid crystal display device.As can be seen from the figure, a pixel is made of pixel thin film transistor (TFT) (TFT) 201, liquid crystal capacitance (Clc) 203 and memory capacitance (Cst) 202.The vision signal that imposes on data line 208 is written to liquid crystal capacitance 203 and memory capacitance 202 by pixel TFT201 and is held.
Figure 48 has shown the planimetric map of a pixel, and Figure 49 has shown along the fragmentary sectional view of the line E-E ' of planimetric map.Figure 48 has shown pixel thin film transistor (TFT) (TFT) 201, memory capacitance (Cst) 202, storage capacitance line 206, gate line 207, data line 208 etc.In addition, Figure 49 has shown Al distribution 215 and the TFT substrate 216 of subtend substrate 210, counter electrode 211, alignment films 212, pixel capacitors (ITO) 214, data line.
In the continuous type liquid crystal display device on the scene, between pixel on subtend substrate 210 1 sides and pixel, generally be not provided with and cover black matrix" (BM).
This is because a continuous type liquid crystal display device does not need to be provided with color filter and BM.If BM is set for subtend substrate 210, when then producing offset when at stack TFT substrate 216 and subtend substrate 210, numerical aperture can reduce.Therefore, must on TFT substrate 216 1 sides, provide corresponding function with BM.In the situation of this figure, as the Al distribution 215 and neighboring pixels electrode 214 crossovers of data line, to realize substituting the function of BM.
Yet when data line 215 and pixel capacitors 214 each other during crossover, because the coupling of electric capacity, the potential fluctuation of data line 215 can cause the potential fluctuation of pixel capacitors 214.
If the response speed of liquid crystal 213 is slower, then the response of liquid crystal just can not followed the frequency (far above the frequency of general frame rate) of the potential fluctuation that produces in the data line 215.Thereby even picture quality is not exerted an influence, but liquid crystal 213 also can be made reaction slightly to high-frequency potential change, can cause brightness to change thus in the liquid crystal of continuous type on the scene.
In addition, be to be parallel to gate line 207 and to be provided with in some cases because form the storage capacitance line 206 of memory capacitance 202, so understanding with data line 208, it intersect.Owing to,, also can cause the brightness of pixel to change thus so the potential fluctuation of data line 208 can make the pixel voltage fluctuation by memory capacitance 202 in the coupling of intersection point place electric capacity.These variations of brightness can cause flicker, and this has greatly reduced picture quality.
Summary of the invention
A typical purpose of the present invention is by reducing to have used the flicker than the liquid crystal display device of the liquid crystal material of high response speed to improve a picture quality of continuous type liquid crystal display device, and a kind of liquid crystal display device that significantly improves the light utilization ratio is provided.
In order to realize aforesaid typical purpose, comprise according to liquid crystal display device of the present invention:
Display panel, comprise PEL matrix and be oppositely arranged with PEL matrix, and between them, accompany the counter electrode of liquid crystal layer, in PEL matrix, each pixel that all comprises on-off element and pixel capacitors at least is arranged to matrix near the intersection point of the data line of vertical and horizontal setting and gate line; And
Control part, it will show that the cycle of a color image frame is divided into a plurality of period of sub-frame, and light light sources of different colors for each period of sub-frame, thereby according to color display image on display panel of light source, wherein
Between pixel capacitors and data line, be provided with the guarded electrode layer that separates by dielectric film.
Although the present invention constitutes hardware, it is not limited in this.The present invention also can constitute control system, driving method and the control program as software.
When the present invention constituted control system, it was constructed as follows.In other words, be configured to the control system of drive controlling one display panel according to control system of the present invention, this display panel comprises: PEL matrix and be oppositely arranged with PEL matrix, and between them, accompany the counter electrode of liquid crystal layer, in PEL matrix, each pixel that all comprises on-off element and pixel capacitors at least is arranged to matrix near the intersection point of the data line of vertical and horizontal setting and gate line.This control system comprises control part, it will show that the cycle of a color image frame is divided into a plurality of period of sub-frame, and light light sources of different colors for each period of sub-frame, thereby according to color display image on display panel of light source, wherein control part applies voltage for the guarded electrode layer that is arranged between pixel capacitors and the data line.
When the present invention constituted driving method, it was constructed as follows.In other words, be configured to the driving method of display image on display panel according to driving method of the present invention, this display panel comprises: PEL matrix and be oppositely arranged with PEL matrix, and between them, accompany the counter electrode of liquid crystal layer, in PEL matrix, each pixel that all comprises on-off element and pixel capacitors at least is arranged to matrix near the intersection point of the data line of vertical and horizontal setting and gate line.This method comprises:
The cycle that shows a color image frame is divided into a plurality of period of sub-frame, and lights light sources of different colors for each period of sub-frame, thereby according to color display image on display panel of light source; And
Apply voltage for the guarded electrode layer that is arranged between pixel capacitors and the data line.
When the present invention constituted control program, it was constructed as follows.In other words, constitute the control program that is used for drive controlling one display panel according to control program of the present invention, this display panel comprises: PEL matrix and be oppositely arranged with PEL matrix, and between them, accompany the counter electrode of liquid crystal layer, in PEL matrix, each pixel that all comprises on-off element and pixel capacitors at least is arranged to matrix near the intersection point of the data line of vertical and horizontal setting and gate line.This program makes computing machine carry out following function:
Export the function of following steering order, promptly this steering order will show that the cycle of a color image frame is divided into a plurality of period of sub-frame, and light light sources of different colors for each period of sub-frame, thereby according to color display image on display panel of light source; And
Export the function of following steering order, promptly this steering order applies voltage for the guarded electrode layer that is arranged between pixel capacitors and the data line.
The present invention stops pixel capacitors and data line to be coupled by stray capacitance by shielding.On the other hand, the coupling that utilization of the present invention is produced by stray capacitance, the potential fluctuation of control pixel capacitors makes it almost equal between each subframe, thereby even uses the liquid crystal material than high response speed also can significantly reduce flicker.As a result, by using the liquid crystal material than high response speed, the driving method by use has a large amount of subframes can improve brightness.
Brief description of the drawings
Fig. 1 is the circuit diagram according to the display part of the liquid crystal display device of first exemplary embodiment of the present invention;
Fig. 2 is the planimetric map that shows according to the single pixel structure of first exemplary embodiment of the present invention;
Fig. 3 is the schematic sectional view along the line A-A ' of Fig. 2;
Fig. 4 is the sequential chart that shows according to the driving method of first exemplary embodiment shown in Fig. 1;
Fig. 5 is the calcspar of demonstration according to the structure of the whole liquid crystal display device of first exemplary embodiment of the present invention;
Fig. 6 is the process flow diagram of the operation of disclosed whole liquid crystal display device in the displayed map 5;
Fig. 7 is described in the manufacturing step of disclosed display part among Fig. 1, the view of the pixel layout of a process (1);
Fig. 8 is a view of describing the pixel layout (2) that follows Fig. 7 process afterwards closely;
Fig. 9 is a view of describing the pixel layout (3) that follows Fig. 8 process afterwards closely;
Figure 10 is a view of describing the pixel layout (4) that follows Fig. 9 process afterwards closely;
Figure 11 is a view of describing the pixel layout (5) that follows Figure 10 process afterwards closely;
Figure 12 is the view of describing according to the pixel layout of second exemplary embodiment of the present invention;
Figure 13 is the view of describing according to the pixel layout of the 3rd exemplary embodiment of the present invention;
Figure 14 is the view of describing according to another pixel layout of the 3rd exemplary embodiment of the present invention;
Figure 15 is the view of describing according to the pixel layout of the 4th exemplary embodiment of the present invention;
Figure 16 is the view of demonstration according to the cross section structure of a pixel of the 4th exemplary embodiment of the present invention;
Figure 17 is the view of describing according to the pixel layout of the 5th exemplary embodiment of the present invention;
Figure 18 is the view of demonstration according to the cross section structure of a pixel of the 5th exemplary embodiment of the present invention;
Figure 19 is the view of describing according to the pixel layout of the 6th exemplary embodiment of the present invention;
Figure 20 is the view of demonstration according to the cross section structure of a pixel of the 6th exemplary embodiment of the present invention;
Figure 21 is the sequential chart of demonstration according to the driving method of the liquid crystal display device of the 7th exemplary embodiment of the present invention;
Figure 22 is the sequential chart of demonstration according to the driving method of the liquid crystal display device of the 8th exemplary embodiment of the present invention;
Figure 23 is the sequential chart of demonstration according to the driving method of the liquid crystal display device of the 9th exemplary embodiment of the present invention;
Figure 24 is the sequential chart of demonstration according to the driving method of the liquid crystal display device of the tenth exemplary embodiment of the present invention;
Figure 25 is the sequential chart of demonstration according to the driving method of the liquid crystal display device of the 11 exemplary embodiment of the present invention;
Figure 26 is the sequential chart of demonstration according to the driving method of the liquid crystal display device of the 12 exemplary embodiment of the present invention;
Figure 27 is the sequential chart of demonstration according to the driving method of the liquid crystal display device of the 13 exemplary embodiment of the present invention;
Figure 28 is the calcspar of structure that shows the liquid crystal projection apparatus of the 14 exemplary embodiment of the present invention;
Figure 29 is the view that is described in the structure of the colour wheel that uses in the 14 exemplary embodiment of the present invention;
Figure 30 is the view that is described in another structure of the colour wheel that uses in the 14 exemplary embodiment of the present invention;
Figure 31 is the sequential chart of demonstration according to the driving method of the liquid crystal display device of the 14 exemplary embodiment of the present invention;
Figure 32 is the sequential chart of demonstration according to the driving method of the liquid crystal display device of the 14 exemplary embodiment of the present invention;
Figure 33 is the sequential chart of demonstration according to the driving method of the liquid crystal display device of the 15 exemplary embodiment of the present invention;
Figure 34 is the calcspar of structure that shows the 3 d image display of the 16 exemplary embodiment of the present invention;
Figure 35 is the view that is described in the operation of using in the 16 exemplary embodiment of the present invention backlight;
Figure 36 is the view that is described in another operation backlight of using in the 16 exemplary embodiment of the present invention;
Figure 37 is the calcspar of demonstration according to the structure of the liquid crystal display device of the 16 exemplary embodiment of the present invention;
Figure 38 is the sequential chart of demonstration according to the driving method of the liquid crystal display device of the 16 exemplary embodiment of the present invention;
Figure 39 is the calcspar of structure that is presented at the display part of the liquid crystal display device that uses in the 3 d image display of the 17 exemplary embodiment of the present invention;
Figure 40 is the view that is described in the pixel layout of the liquid crystal display device that uses in the 17 exemplary embodiment of the present invention;
Figure 41 is the sequential chart that is presented at the driving method of the liquid crystal display device that uses in the 17 exemplary embodiment of the present invention;
Figure 42 is the calcspar of structure that shows the display part of available liquid crystal display device;
Figure 43 is the calcspar that is presented at the structure of the liquid crystal display device that uses in the available liquid crystal projector;
Figure 44 is a view of describing the structure of available liquid crystal projector;
Figure 45 is the calcspar of the structure of existing continuous type liquid crystal display device;
Figure 46 is the sequential chart that shows the driving method of existing continuous type liquid crystal display device;
Figure 47 is the equivalent circuit figure of the single pixel of existing continuous type liquid crystal display device;
Figure 48 has a planimetric map of the structure of the single pixel of continuous type liquid crystal display device now;
Figure 49 is the view of the cross section structure of existing continuous type liquid crystal display device.
The detailed description of exemplary embodiment
Next, will be by describe exemplary embodiment of the present invention in detail with reference to accompanying drawing.
As shown in Fig. 1-Figure 41,, comprise according to the liquid crystal display device of exemplary embodiment of the present invention: display panel as basic structure; And control part (32), display panel comprises PEL matrix, and be oppositely arranged with PEL matrix, and liquid crystal layer is clipped in counter electrode between them, in PEL matrix, each all comprises on-off element (11) and pixel capacitors (24 at least, 94,104 or 114) pixel is at data line (D1-D10,18,58,78,88,98,108 or 118) and near the intersection point of gate line (G1-G8,17 or 57) be arranged to matrix, control part (32) will show that the cycle of a color image frame is divided into a plurality of period of sub-frame, and each frame period lighted light sources of different colors, thereby, wherein between pixel capacitors and data line, be provided with the guarded electrode layer that separates by dielectric film according to color display image in display panel of light source.Control part changes waveform provides voltage to give guarded electrode layer (25,55,95, or 105) in each period of sub-frame.
For exemplary embodiment of the present invention, can between pixel capacitors and data line, shield, thereby reduce the coupling of the stray capacitance of generation therebetween, can significantly reduce thus because the flicker that voltage fluctuation caused that produces in the pixel capacitors.
Next will be by describe liquid crystal display device with reference to specific example according to exemplary embodiment of the present invention.
(first exemplary embodiment)
Fig. 1 is the circuit diagram of demonstration according to the structure of the TFT substrate of the liquid crystal display device of first exemplary embodiment of the present invention.
First exemplary embodiment is made of TFT substrate 26, this TFT substrate 26 comprises: PEL matrix, and wherein each comprises at least that all the pixel of pixel TFT (on-off element) 11 and liquid crystal capacitance (Clc) 12 is arranged to matrix at the data line D1-D10 of vertical and horizontal setting and each intersection point place of gate lines G 1-G8; Be arranged on the PEL matrix periphery and be used for the data driving circuit 15 of driving data lines D1-D10 and be arranged on the gate driver circuit 14 that the periphery is used for driving grid line G1-G8.In addition, be provided with public counter electrode (public electrode) at each pixel place, TFT substrate 26 and and the subtend substrate 20 that is oppositely arranged of TFT substrate 26 between be filled with liquid crystal.The surface of TFT substrate 26 and subtend substrate 20 is provided with the alignment films 22 that is used to arrange liquid crystal respectively.
In this example, ten data lines and eight gate lines have been shown.Yet the quantity of these lines is not limited to these.In addition, can memory capacitance (Cst) 13 be set to pixel.In addition, data driving circuit 15 and gate driver circuit 14 can be formed on the TFT substrate with TFT, perhaps form by mounting driver IC on the TFT substrate, perhaps can use to be arranged on TFT substrate circuit outer and that connect by cable etc.
Fig. 2 is the planimetric map that shows the single pixel of first exemplary embodiment.In addition, Fig. 3 has shown the cross section structure of pixel shown in Fig. 2 of A-A ' along the line.In first exemplary embodiment, between the pixel capacitors 24 of data line 18 and formation memory capacitance 13, be provided with guarded electrode (guarded electrode layer) 25, the width of this guarded electrode 25 can cover data line 18.This guarded electrode 25 is arranged on the data line 18 in a certain zone at least, be provided with in this zone the contributive pixel of the demonstration of liquid crystal display device, and the guarded electrode layer of adjacent image point interconnects on this guarded electrode 25 and the data line.The other end of memory capacitance 13 and 16 couplings of common storage electric capacity line.
Next, the operation of first exemplary embodiment will be described by the sequential chart of reference Fig. 4.Tf is the frame period that is used to show a screen coloured image.The control circuit 32 of Miao Shuing is divided into three period of sub-frame Tsf_r at least with the frame period afterwards, Tsf_g and Tsf_b, and light light sources of different colors by period of sub-frame, thereby on display panel according to the color display image of light source.
More particularly, in period of sub-frame Tsf_r, from after after described control circuit 32 receives vision signal 43, gate driver circuit 14 is given gate lines G 1-G8 output pulse, thereby continuously pixel TFT11 is become conducting state according to vision signal 43.From after after described control circuit 32 receives control signal 44, data driving circuit 15 carries out synchronously with the output of grid circuit 14 according to control signal 44, thus to the vision signal of data line D1-D10 output R.
By this operation, vision signal is written to each pixel rows along gate lines G 1-G8 continuously.After vision signal writes last column pixel rows that is connected with gate lines G 8 again through a specific period after, become in the cycle of high level at control signal LED_R, the light source of some shiny red (R) shows the image of red (R) thus.
In period of sub-frame Tsf_g, with the same in the situation of period of sub-frame Tsf_r, by gate driver circuit 14 continuous drive gate lines G 1-G8, and by carrying out therewith synchronously to the image of data line D1-D10 output green (G), thereby write the image of green (G) for all pixels.By being the light source of the periodic process mid point bright green (G) of high level at control signal LED_G, can show the image of green (G).Similarly, the image that in period of sub-frame Tsf_b, shows blue (B).By this a series of operation, the beholder of liquid crystal display device obtains mixture of colours effect in time, and with redness (R), the image of green (G) and blue (B) is considered as coloured image.
Note, it is desirable to signal and write the time that the capable time point of final pixel is set to be longer than liquid crystal 23 abundant responses to the cycle between the time point of some bright light source.For example, when with the frame rate display image of 60Hz, because period of sub-frame is about 5.6ms, so the response time of liquid crystal 23 it is desirable to 5.6ms or littler.Response time is short more, and it is many more that the light utilization ratio improves.Yet, reduce if can tolerate the light utilization ratio, even when the response time of liquid crystal 23 surpasses 5.6ms, also can obtain to show.Stand-by period in this situation can be shorter than the response time of liquid crystal 23.Yet in this case, there is the situation that needs to revise the luminance difference on the screen.Here liquid crystal response time representation transmissivity becomes time of 90% and transmissivity from 100% T.T. that becomes 10% time sum of the two from 0.
In addition, in this embodiment, public electrode current potential VCOM is made as constant potential, and vision signal changes by the period of sub-frame unit with respect to the polarity of VCOM.Guarded electrode current potential VSHD is made as constant potential.With the vision signal that is written to all pixels with respect to the polarity of VCOM by subframe unit be made as equate be because, electric field intensity between the pixel capacitors adjacent one another are in vertical direction can be reduced with this driving method, thereby the zone that causes light to leak owing to disclination (disclination) can be reduced.When the light leakage region reduces, can guarantee bigger numerical aperture, thereby can improve the light utilization ratio.Yet, reduce if can tolerate the light utilization ratio, also can use polarity for each pixel provisional capital different line counter-rotating or the polarity point counter-rotating different with the lineament pattern.
In addition, shown in here is a following example, and promptly wherein counter electrode current potential VCOM is made as constant potential, and the vision signal that is written to pixel is reversed by subframe unit with respect to the polarity of VCOM, thereby realizes that the AC that does not apply the DC electric field to liquid crystal drives.Yet, also can use the method that changes the VCOM current potential by subframe unit.In addition, although disclosed the example that guarded electrode current potential VSHD is made as constant potential in the accompanying drawing, this voltage also can change by each period of sub-frame.Selectively, period of sub-frame is divided into a plurality of cycles, by the described current potential of the cyclomorphosis of each division.
For liquid crystal display device, even when liquid crystal uses material than high response speed, also can significantly reduce flicker according to this exemplary embodiment of the present invention.Because when pixel capacitors and data line were coupled owing to stray capacitance, the potential fluctuation of data line caused the potential fluctuation of pixel capacitors, so produced flicker, this is to use a problem than the liquid crystal display device of high response speed material for liquid crystal.Yet, in liquid crystal display device, be provided with guarded electrode below by dielectric film, thereby the stray capacitances between pixel capacitors and the data line etc. reduce to minimum in pixel capacitors according to this exemplary embodiment of the present invention.Therefore can significantly reduce flicker.
Fig. 5 has shown the calcspar according to the liquid crystal display device of first exemplary embodiment of the present invention.In order to use liquid crystal display device to carry out the colour demonstration according to first exemplary embodiment of the present invention, need be provided for driving the control circuit 32 of liquid crystal display main body (display panel) 33, independent reference mark shiny red (R), green (G) and blueness (B) light source backlight 34 and be used to produce the signal source 31 of vision signal 41.
Control circuit 32 comprises: vision signal entering apparatus 321, and it drives liquid crystal display device main body 33 required vision signal 43 and control signal 44 by using to produce from the vision signal 41 of signal source 31 and synchronizing signal 42; Light source igniting control device 322, it is used to control backlight 34 BL control signal 45 by carrying out exporting synchronously with the operation of liquid crystal display device main body 33.In addition, as hereinafter described, control circuit 32 comprises that also guarded electrode voltage applies device 323, and it is used for applying voltage to the guarded electrode layer 25 of liquid crystal display device 33.
Backlight 34 have following function, and promptly its energy basis is put shiny red (R) separately from the BL control signal 45 of the light source igniting control device 322 of control circuit 32, the light source of green (G) and blue (B).An example as this light source can use LED.In addition, although do not illustrate, need be provided for providing the power supply of voltage to control circuit 32, liquid crystal display device 33 and backlight 34.
Be used to drive the operation of control circuit 32 of the liquid crystal display device of first exemplary embodiment of the present invention below with reference to the flow chart description of Fig. 6.
When the operation of liquid crystal display device began, in step S101, control circuit 32 was from the input of signal source 31 receiving video signals 41 and synchronizing signal 42.Then, in step S102, carried out following operation before a subframe step, the signal according to input in this subframe step forms vision signal corresponding to a color in each color.
In step S103, use vision signal entering apparatus 321 will be written to pixel (write step) according to the vision signal 43 that input signal forms corresponding to a color in each color by data line.Finished write after, the write time of in step S104, guaranteeing appointment, and in step S105 by using light source igniting control device 322 to light the light source (step display) of response color.
With step S103 to the operation of step S105 parallel carry out be, in step S106, impose on the voltage waveform of guarded electrode layer and compare with voltage waveform before and change, in step S107, use guarded electrode voltage to apply device 323 and apply voltage waveform for the guarded electrode layer.Sequence of operations from step S102 to step S107 is corresponding to a subframe step.
After having finished this subframe step, in step S108, judge whether all colors have all been finished the subframe step.When judgement was not all finished all colors, operation turned back to step S102, thereby next color is carried out the subframe step.After all color of objects had all been finished the subframe step, operation turned back to step S101, to import next input signal.
The sequence of operations from step S101 to step S108 here is corresponding to a frame step.
Next, the example of the method that is used for first exemplary embodiment shown in the shop drawings 2 is described with reference to the accompanying drawings.
Fig. 7-Figure 11 is to be the view that unit shows the pixel layout of liquid crystal display device main body 33 with the master operation step.
At first, on the transparency carrier of making by glass, quartz, plastics etc., form dielectric film, as SiO 2Or SiN.Then, on dielectric film, form the semiconductor layer that will become TFT, subsequently it is carried out pattern-forming.
Fig. 7 has shown and has finished the be shaped pixel layout in this stage of semiconductor layer pattern.With in each optimal processes step, need the same, on semiconductor layer, to carry out each processing, as annealing, doping, hydrogenation and activation.
On the top surface of semiconductor layer, form gate metal layer, and between them, insert by SiO 2Deng the thin dielectric membrane that forms, and this gate metal layer carried out pattern-forming.
Fig. 8 has shown the pixel layout after finishing the gate metallic pattern shaping, wherein is provided with pixel TFT51, memory capacitance 52, storage capacitance line 56 and gate line 57.As metal as gate line 57, but WSi used, Mo, Cr, Al etc. are although the material that uses can change according to the maximum temperature that is reached in the operation.Afterwards, form SiO 2Deng dielectric film, be formed for the contact hole that the data line metal is electrically connected with semiconductor layer or gate metal at the some place of needs.Then, form the data line metal level, and it is carried out pattern-forming.
Fig. 9 has shown the pixel layout after the metal level of composition data line 58 is finished pattern-forming.For metal level, it is desirable to use low resistive metal, as Al.On data line 58, be formed with the metal level that constitutes guarded electrode 55, between them, be inserted with SiO 2, the dielectric film of SiN etc., and this metal level carried out pattern-forming.The width of guarded electrode 55 is wideer than the width of data line 58, and it is arranged on the position of cover data line 58.Guarded electrode 55 along data line 58 pixel adjacent one another are in vertical direction is connected to each other.
Figure 10 has shown that guarded electrode layer 55 finishes the pixel layout after the pattern-forming.Although do not illustrate, guarded electrode layer 55 passes through in the viewing area or the outside contact hole in viewing area is electrically connected with data line metal level 58 or gate metal layer 57.On guarded electrode layer 55, be formed with the pixel capacitors metal level, be inserted with dielectric film between them, and this pixel capacitors metal level is carried out pattern-forming.
Figure 11 has shown that the pixel capacitors metal level finishes the pixel layout after the pattern-forming.By SiO 2Or the laminated film (laminated film) of the graduation film (flattening film) made of SiN and acryl resin can be used as the dielectric film that is formed between guarded electrode layer 55 and the pixel capacitors metal level.In addition, for the pixel capacitors metal level, use ELD, an example of its material is ITO.Pixel capacitors must be electrically connected with the semiconductor layer that constitutes TFT.In the accompanying drawings, disclosed the situation that pixel capacitors is connected with semiconductor layer by contact hole 60.
Yet, by a plurality of contact holes pixel capacitors and semiconductor layer are electrically connected, and insertion data line metal, shielded metal etc. also are good between them.In addition, the material of above-mentioned dielectric film as an example and the material of metal film and essential content of the present invention are irrelevant, also can use other materials.Important means are to have following structure in this exemplary embodiment, and promptly the guarded electrode that is separated by dielectric film is layered between data line and the pixel capacitors.
For first exemplary embodiment, even when liquid crystal uses material than high response speed, also can significantly reduce flicker.Because when pixel capacitors 24 and data line 18 were coupled owing to stray capacitance, the potential fluctuation of data line 18 caused the potential fluctuation of pixel capacitors 24, so produced flicker, this is that liquid crystal uses a problem than the liquid crystal display device of high response speed material.
Yet in first exemplary embodiment, guarded electrode 25 is arranged on below the pixel capacitors 24 by dielectric film, thereby the stray capacitance between pixel capacitors 24 and the data line 18 can be reduced to minimum.Therefore, even when liquid crystal uses material than high response speed, also can significantly reduce flicker.Thus, can obtain following liquid crystal display device, it promptly is written to the time of the time of final pixel to light source igniting from vision signal by shortening the stand-by period, improves the light utilization ratio, thus the demonstration that can become clear.
(second exemplary embodiment)
Figure 12 has shown an example according to the pixel layout of second exemplary embodiment of the present invention.
The difference of second exemplary embodiment and first exemplary embodiment is, guarded electrode 65 is also by along the conductive layer of gate line setting and be connected with adjacent guarded electrode 65 on right side and the left side.In the example shown here, guarded electrode 65 is arranged on the gate line, so that it is connected with the guarded electrode of pixel on right side and the left side.Yet it is not main that guarded electrode 65 is arranged on the gate line.Guarded electrode 65 can be arranged on the optional position, as long as in the viewing area.Yet, it is desirable to guarded electrode 65 is arranged on gate line or the storage capacitance line, reduce to prevent numerical aperture.
In this pixel layout, guarded electrode 65 is connected between the vertical and horizontal pixel adjacent one another are.Thereby, can suppress the fluctuation of the guarded electrode current potential that the capacitive coupling owing to guarded electrode and data line causes.Thus, can further reduce the potential fluctuation of pixel capacitors.As a result, can significantly reduce flicker.
(the 3rd exemplary embodiment)
Figure 13 has shown an example according to the pixel layout of the 3rd exemplary embodiment of the present invention.
The difference of the 3rd exemplary embodiment and first exemplary embodiment is, guarded electrode 75 is arranged on the data line 78, thereby cover the data line 78 except that the tie point of data line 78 and pixel TFT, the guarded electrode of adjacent image point links to each other on guarded electrode 75 and the data line 78.
In the example of Figure 13, in the location that is provided with the contact hole 79 that connects data line 78 and pixel TFT, guarded electrode 75 is cover data line 78 not.This is that if guarded electrode 75 is arranged on the hollow bulb, data line 78 and guarded electrode 75 can be short-circuited because be formed on the sectional view of the data line 78 in contact hole 79 parts and have hollow bulb.
In the example shown here, exist guarded electrode 75 not cover data line 78 to avoid the zone of contact hole 79 parts.By the same token, can locate also to be provided with the not zone of cover data line 78 of guarded electrode 75 at intersection point between the intersection point between semiconductor layer and the data line, gate line and the data line etc.In addition, as shown in Figure 14, for the layout that guarded electrode 85 links to each other between the electrode adjacent one another are along gate line, guarded electrode 85 is located to cut off at intersection point between intersection point, semiconductor layer and the data line 88 of contact hole 89 parts and data line 88 and the intersection point between gate line 87 and the data line 88 etc.
For these pixel layout, according to guarded electrode 75,85 size in the zone of cover data line 78,88 not, the effect that suppresses flicker can reduce.Yet, can reduce by the generation defective that short circuit caused between guarded electrode 75,85 and the data line 78,88, thereby can expect to improve output.
(the 4th exemplary embodiment)
Figure 15 has shown the pixel layout according to the 4th exemplary embodiment of the present invention.Figure 16 has shown along the cross section structure of the line B-B ' of Figure 15.
The difference of the 4th exemplary embodiment and first exemplary embodiment is, guarded electrode layer 95 in the 4th exemplary embodiment is arranged at data line 98 and leans between the end of data line one side with pixel capacitors 94 by the end of pixel capacitors 94 1 sides, and guarded electrode layer 95 interconnects with the guarded electrode layer of pixel adjacent one another are on the end of data line 98.
The end of tentation data line 98 is called a, and the end of pixel capacitors 94 is called b, and then guarded electrode layer 95 is arranged to be covered at least the crossover portion of data line 98 and pixel capacitors 94, the i.e. part of being represented by a-b.In other parts except that crossover portion, the zone that exists data line 98 not have conductively-closed electrode 95 to cover.
In the example of Figure 15, guarded electrode 95 is along linking to each other between data line 98 pixel adjacent one another are in vertical direction.Yet as shown in Figure 12, guarded electrode 95 also can link to each other between the pixel adjacent one another are in a lateral direction.In addition, as shown in Figure 13, a part of crossover portion of data line 98 and pixel capacitors 94 needn't cover by the conductively-closed electrode, be short-circuited between guarded electrode 95 and the data line 98 preventing, or because other reasons.For this pixel layout,, can obtain the effect that suppresses to glimmer, the capacitive coupling component maximum between this crossover portion place's pixel capacitors 94 and data line 98 by guarded electrode 95 being set at crossover portion place.In addition, by the size that reduces crossover portion between data line 98 and the guarded electrode 95 the distribution electric capacity of data line 98 is diminished.Thereby speed that can be higher writes data line 98 with voltage.In addition, can reduce to be used on the data driving circuit driving data lines 98 load, thereby can realize lower power consumption.
(the 5th exemplary embodiment)
Figure 17 has shown the pixel layout according to the 5th exemplary embodiment of the present invention.Figure 18 has shown along the cross section structure of the line C-C ' of Figure 17.
With the same in the situation of the 4th exemplary embodiment, the guarded electrode layer of the 5th exemplary embodiment is arranged at data line 108 and leans between the end of data line 108 1 sides with pixel capacitors 104 by the end of pixel capacitors 104 1 sides, and guarded electrode layer 105 interconnects with the guarded electrode layer of adjacent image point on the end of data line 108.
In addition, the difference of the 5th exemplary embodiment and first exemplary embodiment is, its layout like this: in most pixel areas, the end a of data line 108 and the end b of pixel capacitors 104 are not arranged to crossover each other; Guarded electrode 105 be arranged to the end a crossover of data line 108, with the end b crossover of pixel capacitors 104 or with end a and end b crossover all; And a part or whole data line 108 not conductively-closed electrode 105 cover.
Figure 17 illustrates a following example, promptly wherein guarded electrode 105 along linking to each other between data line 108 pixel adjacent one another are in vertical direction.Yet as shown in Figure 12, guarded electrode 105 also can link to each other between the pixel adjacent one another are in a lateral direction.In addition, as shown in Figure 13, the part of pixel capacitors 104 ends needn't cover by conductively-closed electrode 105, be short-circuited between guarded electrode 105 and the data line 108 preventing, or because other reasons.
In this pixel layout, the closeest on the online a-b of line of electric force that is produced by the potential difference (PD) between pixel capacitors 104 and the data line 108 (connect end a and end b), online a-b goes up nearest between pixel capacitors 104 and the data line 108.Thereby, by guarded electrode 105 is arranged on this part, can reduce the capacitive coupling of pixel capacitors 104 and data line 108.Thus, can obtain the effect that suppresses to glimmer.In addition, by reducing the size in the crossover zone between data line 108 and the guarded electrode 105, can reduce the distribution electric capacity of data line 108.Therefore, speed that can be higher is written to data line 108 with voltage.In addition, can reduce to be used on the data driving circuit driving data lines 108 load, thereby can realize lower power consumption.
(the 6th exemplary embodiment)
Figure 19 has shown the pixel layout according to the 6th exemplary embodiment of the present invention.Figure 20 has shown along the cross section structure of the line D-D ' of Figure 19.
The difference of the 6th exemplary embodiment and first exemplary embodiment is, guarded electrode layer 115 is arranged on the intermediate point place of following line, be described line connect data line 118 by the end of pixel capacitors 114 1 sides and pixel capacitors 114 by data line 118 1 sides the end, be parallel to the extension of guarded electrode layer 115 of data line 118 and the guarded electrode layer of adjacent image point and interconnect.
In other words, the 6th exemplary embodiment has following layout: the end a of data line 118 and the end b of pixel capacitors 114 are not arranged to crossover each other in most pixel areas; Guarded electrode 105 is arranged on the c place, position of intermediate point between part a and the part b; And the part of data line 118 or entire portion not conductively-closed electrode 115 cover.
Figure 19 has disclosed a following example, and promptly guarded electrode 115 is along linking to each other between data line 118 pixel adjacent one another are in vertical direction.Yet as shown in Figure 12, guarded electrode 115 also can link to each other between the pixel adjacent one another are in a lateral direction.In addition, as shown in Figure 13, the end a of pixel capacitors 114 needn't cover by conductively-closed electrode 115, be short-circuited between guarded electrode 115 and the data line 118 preventing, or because other reasons.
In this pixel layout, the closeest on the online a-b of line of electric force that produces by the potential difference (PD) between pixel capacitors 114 and the data line 118 (connect end a and end b), nearest between pixel capacitors 114 and the data line 118 on this line a-b.Thereby, by guarded electrode 115 is arranged on this part, can reduce the capacitive coupling of pixel capacitors 114 and data line 118.Thus, can obtain the effect that suppresses to glimmer.Yet, suppress the effect of effect less than the 5th the described situation of exemplary embodiment.
Simultaneously because guarded electrode 115 not with pixel capacitors 114 and data line 118 crossovers, so the step (step) that produces by being arranged at guarded electrode 115 wherein in pixel section can be reduced.Reduce the orientation characteristic that step can effectively improve liquid crystal molecule.In addition, because can reduce the size in the crossover zone between data line 118 and the guarded electrode 115, so the distribution electric capacity of data line 118 can be reduced.Therefore, speed that can be higher is written to data line 118 with voltage.In addition, the load of driving data lines 118 can be reduced to be used on the data driving circuit, thereby lower power consumption can be realized.
(the 7th exemplary embodiment)
Figure 21 is the sequential chart of demonstration according to the driving method of the liquid crystal display device of the 7th exemplary embodiment of the present invention.
As the structure and the structure of liquid crystal display device, can use any one in above-mentioned first to the 6th exemplary embodiment of the present invention.Difference between the 7th exemplary embodiment and first exemplary embodiment is a driving method, i.e. the mode of control shielding electrode potential VSHD.As shown in Figure 21, in the 7th exemplary embodiment,, change guarded electrode current potential VSHD by subframe unit according to the polarity of vision signal with respect to VCOM.
For this driving method of liquid crystal display device, can significantly reduce flicker.
As mentioned above, by guarded electrode is made as constant potential, can fully reduce the potential fluctuation of the pixel capacitors that the potential fluctuation owing to data line causes.In addition, change the current potential of guarded electrode, can compensate the luminance difference that the polarity difference according to vision signal produces, only can not prevent fully that by shield effectiveness the polarity of this vision signal is poor by subframe unit.Therefore, can further reduce flicker.
Such reason is, changes the current potential of guarded electrode by the polarity according to vision signal, thereby can use the current potential of guarded electrode to control the current potential of pixel capacitors, only can reduce thus with shield effectiveness the brightness that can not prevent change.
When watching liquid crystal display device, can obtain the variable quantity of guarded electrode current potential VSHD by change VSHD, thereby the amount of flicker can be adjusted into minimum.
(the 8th exemplary embodiment)
Figure 22 is the sequential chart of demonstration according to the driving method of the liquid crystal display device of the 8th exemplary embodiment of the present invention.As the structure and the structure of liquid crystal display device, can use any one in above-mentioned first to the 6th exemplary embodiment of the present invention.Difference between the 8th exemplary embodiment and first exemplary embodiment is a driving method, i.e. the mode of control shielding electrode potential VSHD.
As shown in Figure 22, the difference between them is as follows.In other words, in the 8th exemplary embodiment, according to the polarity of vision signal with respect to VCOM, change guarded electrode current potential VSHD by subframe unit, in addition, for the cycle that writes vision signal with for other cycles, in subframe unit, change the guarded electrode current potential.
In the cycle that the subframe inner potential changes is from writing the cycle time point that vision signal finishes writes beginning to the next one the time point, and it is made as the cycle that comprises a bright light source at least.
For this method, owing to change at the back guarded electrode current potential that writes of finishing vision signal, because when pixel kept vision signal, the variation of guarded electrode current potential made the potential fluctuation of pixel capacitors, so by changing the control that the guarded electrode current potential can more effectively carry out brightness.Therefore, brightness can change according to the undulate quantity of pixel capacitors current potential, can more effectively control brightness thus.When watching liquid crystal display device, can obtain the variable quantity of guarded electrode current potential VSHD by change VSHD, thereby the amount of flicker can be adjusted into minimum.
(the 9th exemplary embodiment)
Figure 23 is the sequential chart of demonstration according to the driving method of the liquid crystal display device of the 9th exemplary embodiment of the present invention.
As the structure and the structure of liquid crystal display device, can use any one in above-mentioned first to the 6th exemplary embodiment of the present invention.Difference between the 9th exemplary embodiment and first exemplary embodiment is a driving method, changes counter electrode current potential VCOM by subframe unit that is:, and the current potential of vision signal is provided with according to VCOM and changes; And the mode difference of control shielding electrode potential.By subframe unit that counter electrode current potential VCOM change is a certain amount of, this measures the amplitude peak of vision signal no better than, and the current potential of vision signal is set according to the current potential of this VCOM.
For this driving method, the amplitude of the vision signal of data driving circuit output approximately can be suppressed to VCOM is made as in the situation of constant potential half.This can reduce the electric power that data driving circuit consumes.In addition, by the guarded electrode current potential is made as constant potential, the effect that the potential fluctuation that can obtain to make pixel capacitors not be subjected to data line influences.As a result, can reduce flicker.
(the tenth exemplary embodiment)
Figure 24 is the sequential chart of demonstration according to the driving method of the liquid crystal display device of the tenth exemplary embodiment of the present invention.As the structure and the structure of liquid crystal display device, can use any one in above-mentioned first to the 6th exemplary embodiment of the present invention.Difference between the tenth exemplary embodiment and the 9th exemplary embodiment is not only to change counter electrode current potential VCOM by subframe unit, but also change guarded electrode current potential VSHD by subframe unit.
In example shown in Figure 24, by each subframe Tsf_r, Tsf_g and Tsf_b change are written to the polarity of the vision signal D1-D10 of pixel with respect to counter electrode current potential VCOM.At control signal LED_R backlight, LED_G and LED_B turn back to and change guarded electrode current potential VSHD in the low level periodic process between the point that writes vision signal in next subframe.
For this driving method, change the current potential of guarded electrode by subframe unit, can compensate the luminance difference that the polarity difference according to vision signal produces, the polarity difference of this vision signal only can not be prevented fully by shield effectiveness.Therefore, can further reduce flicker.Its reason is identical with the reason described in the 7th exemplary embodiment.When watching liquid crystal display device, can obtain the variable quantity of guarded electrode current potential VSHD by change VSHD, thereby the amount of flicker can be adjusted into minimum.
(the 11 exemplary embodiment)
Figure 25 is the sequential chart of demonstration according to the driving method of the liquid crystal display device of the 11 exemplary embodiment of the present invention.As the structure and the structure of liquid crystal display device, can use any one in above-mentioned first to the 6th exemplary embodiment of the present invention.Difference between the 11 exemplary embodiment and the 4th exemplary embodiment is not only to change counter electrode current potential VCOM by subframe unit, but also change guarded electrode current potential VSHD by subframe unit.In addition, for the cycle that writes vision signal and other cycles, in subframe unit, change the guarded electrode current potential.
For this method, by changing the control that the guarded electrode current potential can more effectively carry out brightness.Its reason is identical with the reason described in the 8th exemplary embodiment.When watching liquid crystal display device, can obtain the variable quantity of guarded electrode current potential VSHD by change VSHD, thereby the amount of flicker can be adjusted into minimum.
(the 12 exemplary embodiment)
Figure 26 is the sequential chart of demonstration according to the driving method of the liquid crystal display device of the 12 exemplary embodiment of the present invention.As the structure and the structure of liquid crystal display device, can use any one in above-mentioned first to the 6th exemplary embodiment of the present invention.In addition, identical with first exemplary embodiment almost of the driving method shown in the sequential chart of Figure 26.Difference between the 12 exemplary embodiment and first exemplary embodiment is the drive waveforms of counter electrode current potential VCOM and the sequential of putting bright light source.
For the cycle that writes vision signal with for other cycles, change the voltage of the counter electrode current potential VCOM in each subframe.As its changing method, can use following driving method: the value that will write the VCOM in cycle of vision signal is made as and can makes all pixels all roughly become the voltage of black, and no matter be written to each pixel vision signal value how; After having finished the writing of all vision signals, VCOM turns back to normal voltage.In addition, after VCOM becomes the point of normal voltage, pass through again after the certain hour, light light source backlight.
By this operation, the point when VCOM becomes normal voltage, all pixels of liquid crystal display device become and the corresponding state of vision signal that writes at once.Therefore, even before the variation of finishing liquid crystal fully, put bright light source, on any position of screen, can not produce luminance difference yet.As a result, can increase and light the cycle backlight, thus the screen that can obtain to become clear.
When using this method, must be made as identical with respect to the polarity of VCOM the vision signal that is written to all pixels in each period of sub-frame.The method that being used to of using in this driving method is provided with guarded electrode current potential VSHD and vision signal current potential can be changed into the 7th to the 11 any one method described in the exemplary embodiment.In the situation of this driving method, the required response time of liquid crystal needn't the weak point the same with period of sub-frame.Yet the response time is short more, and it is just many more that the light utilization ratio improves.
For the driving method of the 12 exemplary embodiment,, also can obtain not have the better image quality of glimmering even when liquid crystal uses material than high response speed.This reason is identical with the reason described in the first to the 11 exemplary embodiment.In addition, also can obtain to realize the effect of bright screen.The reason that realizes this point is to light the cycle backlight can be set to longer.
(the 13 exemplary embodiment)
Figure 27 is the sequential chart of demonstration according to the driving method of the liquid crystal display device of the 13 exemplary embodiment of the present invention.As the structure and the structure of liquid crystal display device, can use any one of above-mentioned first to the 6th exemplary embodiment of the present invention.
For this driving method, a frame period Tf is divided into period of sub-frame Tsf_r, Tsf_g1, Tsf_b and Tsf_g2.Except guarded electrode current potential VSHD is made as constant, the operation in each frame period is identical with first exemplary embodiment almost.In period T sf_r, show the R image, in Tsf_b, show the B image.In period T sf_g1 and Tsf_g2, all show the G image.Although do not illustrate, vision signal is reversed by each subframe of next frame with respect to the polarity of counter electrode current potential.
For this driving method, the G image shows twice, has obtained the advantage that screen is brightened thus.On liquid crystal display device, show the required R of pure white (adequate white), in the brightness of G and B, the brightness maximum of G.Next be R, B is last.Therefore must improve the brightness of G light source backlight.
When light source used LED, when the electric current that flows to LED increased, luminescence efficiency reduced.Thereby, compare with the LED that is used for other colors, must increase the LED quantity that is used for G, perhaps use the LED that drives R and B than the littler electric current of electric current of the LED that drives G.Yet, the required brightness of each demonstration is diminished G twice by in a frame, showing.Thereby, also can reduce required electric current.As a result, just can operate by reducing luminescence efficiency.Even when with identical driven by power when backlight, the also image that can obtain to become clear.
Owing to similar reason, can further use a frame to be divided into five subframes and to show G and brightness that the method for twice of R improves screen.In addition, the method that is used to be provided with counter electrode current potential VCOM, guarded electrode current potential VSHD and vision signal current potential in this driving method can be changed into the 7th to the 12 method described in the exemplary embodiment.In this case, except that effect, also can obtain each described effect in those embodiments with bright screen.
(the 14 exemplary embodiment)
Figure 28 has shown the structure example of use according to the liquid crystal projection apparatus of the liquid crystal display device of each exemplary embodiment of the invention described above.
This liquid crystal projection apparatus is made of following device: illuminator 121; Dichronic mirror 122; A plurality of catoptrons 123; Two colour wheels 124,125; The liquid crystal display device 126 that is used for G; The liquid crystal display device 127 that is used for R and B; Synthetic prisms 128; Projecting lens 129.Dichronic mirror 122 only has the light of transmit green (G) wavelength coverage and the function that reflects the light of other wavelength coverages.Dichronic mirror 122 is not to be made of single catoptron, and for example, it also can be made of a plurality of dichronic mirrors and a catoptron, perhaps is made of a color filter and a catoptron.
As shown in Figure 29 and Figure 30, colour wheel 124 and 125 used herein is: be used for the colour wheel 125 of R and B, wherein with the form of disk be provided with the light of transmits red wavelength coverage R color filter 132, transmission blue wavelength region light B color filter 133 and be used for shield light cover color filter 131; With the colour wheel 124 that is used for G, wherein cover color filter 131 with what the form of disk was provided with that the G color filter 134 of light of two transmit green wavelength coverages and two are used for shield light.For the G color filter 134 of the colour wheel 124 that is used for G, also can use the color filter of the light of other wavelength coverages of transmission except that green.
Can constitute synthetic prisms 128 by making up a plurality of prisms, it has and will incide the function that two light compositings on the plane are got up and export the light that is synthesized from another plane.Also can use optical system to replace synthetic prisms 128 with equivalent functions.
As the liquid crystal display device 126 that is used for G be used for R, the structure and the structure of the liquid crystal display device 127 of B can be used any one in above-mentioned first to the 6th exemplary embodiment of the present invention.Its operation will be described in the back, suppose and use the liquid crystal display device described in first exemplary embodiment as those devices.
Be separated into the light of green wavelength scope and the light of other wavelength coverages from the light of illuminator 121 emissions by dichronic mirror 122.The G light of green fields is by G colour wheel 124, catoptron 123 etc. shines the liquid crystal display device 126 of G midway, and the light of transmission incides synthetic prisms 128.
The light of other wavelength coverages incides R by catoptron 123 grades midway except that green, and on the colour wheel 125 of B, the illumination of transmission is mapped to R, the liquid crystal display device 127 of B.The light that sees through the liquid crystal display device 127 of R and B incides on the synthetic prisms 128, and its light compositing with the liquid crystal display device 126 that sees through G is got up, and amplifies the light that synthesized and it is projected on the screen by projecting lens 129.
Figure 31 has shown R, and the sequential chart of the liquid crystal display device 127 of B, Figure 32 have shown the sequential chart of the liquid crystal display device 126 of G.
The operation of the liquid crystal display device 127 of R and B at first, is described with reference to Figure 31.In the liquid crystal display device 127 of R and B, a frame period is divided into two period of sub-frame Tsf_r and Tsf_b.
In period of sub-frame Tsf_r, gate driver circuit is given gate lines G 1-G8 output pulse, is used for continuously pixel TFT being driven into conducting state.Data driving circuit by with the output of gate driver circuit synchronously to the vision signal of data line output red (R).By these operations, vision signal is written to each pixel rows along gate line continuously.After after vision signal is written to last column pixel rows that is connected with gate lines G 8, passing through some cycles again, become in the periodic process of high level at control signal LPM_R, the control rotary manipulation, make the R color filter 132 of colour wheel 125 be in connection catoptron 123 and R, on the light path of the liquid crystal display device 127 of B, thereby make the illumination of red wavelength range be mapped to liquid crystal display device 127.Projection on screen goes out the R image that is formed by the light that sees through by synthetic prisms 128 and projecting lens 129.
Similarly, the vision signal of B is also write liquid crystal display device 127 continuously in period of sub-frame Tsf_b, and control rotary manipulation, make and become in the periodic process of high level at control signal LPM_B, the B color filter 133 of colour wheel 125 is in and connects catoptron 123 and R, on the light path of the liquid crystal display device 127 of B.Thus, obtain the image of blue (B).Also image (B) is projected on the screen by synthetic prisms 128 and projecting lens 129.
Simultaneously, for the liquid crystal display device 126 that is used for G, as shown in the sequential chart among Figure 32, a frame period is divided into two period of sub-frame Tsf_g1 and Tsf_g2.The vision signal that in each frame, all on liquid crystal display device 126, shows green (G), and it is projected on the screen.The video that shows among two period of sub-frame Tsf_g1 and the Tsf_g2 can be identical, or the vision signal that changes according to ad hoc rules.
An example as ad hoc rules, consider following driving method, be that its luminance signal precision setting with input signal is the twice of the liquid crystal display device 126 initial precision that can show, and when demonstration was equal to or less than the brightness of liquid crystal display device 126 minimum resolutions, it cancelled demonstration in a period of sub-frame.
By these operations, can make the grey of G become twice.Be used for projection R, the sequential of B image can identical or skew each other with the sequential that is used for projection G image.Be used for R, the liquid crystal display device of B all is made as specific potential with the counter electrode current potential VCOM and the guarded electrode current potential VSHD that are used for the liquid crystal display device of G.As the method for setting current potential, can use any means of describing with the cross section structure of the liquid crystal device in 11 exemplary embodiment of the 7th-Di.
For the 14 exemplary embodiment, can reduce the size and the cost of liquid crystal projection apparatus.Reason is that this embodiment can constitute projector with two liquid crystal display devices, and needs three liquid crystal display devices usually.
(the 15 exemplary embodiment)
The 14 exemplary embodiment of Figure 33 and the present invention is the same, has shown shown in Figure 28 the sequential chart of another driving method of the liquid crystal display device 126 of G in the liquid crystal projection apparatus.
For the driving method shown in here, the liquid crystal display device 126 of G only shows once (G) image in the single frame period.In addition, the light of green (G) wavelength coverage shines liquid crystal display device consistently in a frame.Therefore, needn't be arranged on the colour wheel of the G shown in the structure of projector shown in Figure 28.
For this liquid crystal projection apparatus, can reduce size of devices and cost, because available two liquid crystal display devices constitute projector, and need three liquid crystal display devices usually here.In addition, also because the colour wheel of G needn't be set.
(the 16 exemplary embodiment)
Figure 34 is the calcspar that shows the 16 exemplary embodiment of the present invention.
The 16 exemplary embodiment of the present invention comprise can for left side and right side control separately ignition period (luminescent device) 145 backlight, display panels 142, lens arra 141, left side and right side light source 143,144 and be used to drive liquid crystal display device and control circuit and power supply (although not illustrating) backlight.Display panels 142 is the liquid crystal display devices in the above-mentioned embodiment, promptly is provided with the device of guarded electrode 25.Is which (light source 143 or light source 144) two light sources changes from the angle of the light of 145 emissions backlight according to what light.
Figure 35 and Figure 36 show respectively when a bright light source 143 and the transmit direction in 144 time of light source.For example, when putting bright light source 143 as shown in Figure 35, Fa She light is directional light thus, and it is with respect to the perpendicular line of backlight 145 top surface and be tilted to the left.
Similarly, when putting bright light source 144 as shown in Figure 36, Fa She light is directional light thus, and it is tilted to the right with respect to perpendicular line.
Backlight 145 see through display panels 142, particularly see through the pixel on it, will be mapped to first viewing location towards the illumination of one of two different directions emission, and see through pixel, will be mapped to second viewing location towards the illumination of other direction emission.By giving 145 output orders backlight, alternately emission is towards the light of two different directions for per two continuous subframes cycles, and according to radiative direction, control circuit 32 is the first viewing location display image, or is the second viewing location display image.
Thus, be that first viewing location shows different images with second viewing location.In addition, first viewing location and second viewing location are set by position for beholder's left eye and right eye, can be by showing 3-D view for the right eye display image with for the left eye display image.In addition, each in light source 144 and the light source 143 is all by corresponding to R, and three light sources of G and B three primary colours light constitute.Each light source all can be controlled ignition period separately.
Figure 37 is the view that shows the structure of the display panels 142 that is used as this exemplary embodiment display.Display panels 142 does not have color filter, and each pixel all is not divided into subpixel yet.As the structure and the structure of liquid crystal display device, can use any one in above-mentioned first to the 6th exemplary embodiment of the present invention.In addition, liquid crystal uses the material that can carry out high speed operation.
Figure 38 is the sequential chart that shows the operation of display panels 142.Tf in the accompanying drawing represents to show the frame period of a screen 3-D view.In this display panels, this frame period Tf is divided into two period of sub-frame Trs and Tls.Trs is the period of sub-frame that shows the image that arrives right eye, and Tls is the period of sub-frame that shows the image that arrives left eye.
Each period of sub-frame is further divided into three cycles.Period of sub-frame Trs is divided into Trs_r, Trs_g, and Trs_b, period of sub-frame Tls is divided into Tls_r, Tls_g, Tls_b.Can carry out each period T rs_r by any one method described in 11 exemplary embodiment of the 7th-Di, Trs_g, Trs_b, Tls_r, Tls_g, the operation among the Tls_b can show 3-D view thus.In the accompanying drawings, R_LED_R has shown the cycle of the light source (light source 144) of the light of lighting the emission red wavelength range.Similarly, R_LED_G has shown the cycle of the light source (light source 144) of the light of lighting the transmitting green wavelength coverage, and R_LED_B has shown the cycle of the light source (light source 144) of the light of lighting the emission blue wavelength region.Simultaneously, L_LED_R, L_LED_G and L_LED_B have shown the light of lighting the emission red wavelength range respectively, the cycle of the light source of the light of green wavelength scope and the light of blue wavelength region (light source 143).
For this exemplary embodiment of the present invention, can less flicker show bright color three dimension image.This is because do not use color filter in the liquid crystal display device that this exemplary embodiment of the present invention is used.Thereby, will not be divided into three subpixel by pixel, thereby can effectively utilize light backlight.In addition, needn't be divided into right eye display image and be the pixel of left eye display image.Therefore, when manufacturing has the liquid crystal display device of identical display area, can provide bigger numerical aperture with transmitted ray.Thereby, can obtain brighter image.Identical described in 13 exemplary embodiment of the reason that can reduce to glimmer and first-Di.
(the 17 exemplary embodiment)
Figure 39 has shown another structure of the display panels shown in Figure 34.As shown in Figure 40, in this display panels, each pixel all is divided into R, three subpixel of G and B.Therefore, light source R and light source L backlight use the light source of launching white light respectively.
Figure 41 has shown the sequential chart of the liquid crystal display device of the 17 exemplary embodiment.A frame period Tf who wherein shows a screen 3-D view is divided into two period of sub-frame Trs and Tls, all shows in each period of sub-frame for the image of right eye with for the image of left eye.
With the cycle of the high level period display dot bright light source R of R_BL, finish pass through special time again after writing image for right eye after, the starting point bright light source.Similarly, the cycle that has shown some bright light source L with the high level period of B_BL.
As the structure and the structure of liquid crystal display device, can use any one in above-mentioned first to the 6th exemplary embodiment of the present invention.In addition, can counter electrode current potential VCOM, guarded electrode current potential VSHD and vision signal current potential be set, and can come operated device by any one method described in 11 exemplary embodiment of the 7th-Di according to structure.In addition, liquid crystal uses the material that can carry out high speed operation.
For this exemplary embodiment of the present invention, can less flicker show bright color three dimension image.This is because the liquid crystal display device that uses needn't be divided into and is used for to the right eye display image and gives the pixel of left eye display image in this exemplary embodiment.Therefore, when manufacturing has the liquid crystal display device of identical display area, can provide bigger numerical aperture with transmitted ray.Thereby, can obtain brighter image.Each is described identical in ten exemplary embodiment of the reason that can reduce to glimmer and first-Di.
In addition, for exemplary embodiment of the present invention, liquid crystal display device described in each exemplary embodiment and liquid crystal system also can be used for the portable terminal device.It can obtain to glimmer on display unit less, the portable terminal device that display brightness is bright.
Liquid crystal display device and the liquid crystal system and the use therein driving method of exemplary embodiment of the present invention have been described in the above.Yet the content of carrying out in each step of above-mentioned driving method all can form the program that can be undertaken by the computing machine of control part.Even use when can carry out the liquid crystal material of high-speed response, also can obtain the purpose that reduces to glimmer with this computing machine, and can improve display brightness.
For embodiments of the present invention, even when liquid crystal display device uses the liquid crystal material of high response speed, also can significantly reduce flicker.
Using the high response speed material to produce the flicker problem as the liquid crystal display device of liquid crystal is because when pixel capacitors and data line were coupled owing to stray capacitance, the potential fluctuation of data line can produce the potential fluctuation of pixel capacitors.In liquid crystal display device of the present invention, by dielectric film the guarded electrode layer is set below pixel capacitors, thereby stray capacitance of pixel capacitors and data line etc. can be reduced to minimum.Thus, can significantly reduce flicker.
In addition, for exemplary embodiment of the present invention, can improve a display brightness of continuous type liquid crystal display device.For field continuous type liquid crystal display device, be used to obtain the required light quantity of suitable white balance according to G, R, it is big that the order of B becomes successively.Thereby in the continuous drive on the scene, than showing that other images show the G image more, this is effective for improving brightness.Yet when sub-frame number increased, each period of sub-frame shortened, and therefore needed the liquid crystal material that can respond at a relatively high speed.Yet, as mentioned above, when response speed of liquid crystal accelerates, will produce flicker.
Even because when the material that uses than high response speed, exemplary embodiment of the present invention also can reduce to glimmer, so can use the driving method of taking a large amount of subframes.Therefore, can obtain to have the bright image of less flicker.
In addition, for exemplary embodiment of the present invention, can reduce the size and the cost of liquid crystal projection apparatus.For exemplary embodiment of the present invention,, also can obtain to have the image of less flicker even when liquid crystal display device makes the use continuous system.Therefore, available two liquid crystal display devices constitute projector, and need three liquid crystal display devices usually.Thus, can reduce the size and the cost of liquid crystal display device.In addition, exemplary embodiment of the present invention can show bright three-dimensional color image with less flicker.
When even the liquid crystal display device that uses in the exemplary embodiment of the present invention makes use continuous type liquid crystal display device, also can obtain to have the image of less flicker.Thereby, color filter needn't be set.Therefore, will not be divided into three subpixel by each pixel, thereby can effectively utilize light backlight.In addition, needn't be divided into right eye display image and be the pixel of left eye display image.Therefore, when manufacturing has the liquid crystal display device of identical display area, can provide bigger numerical aperture with transmitted ray.Thereby, can obtain brighter image.
Although show in detail and described the present invention that with reference to typical embodiment the present invention is not limited to these embodiments.It should be understood by one skilled in the art that under the situation that does not break away from the determined the spirit and scope of the present invention of claims, can carry out various variations in form and details.
Industrial applicibility
As mentioned above, the present invention can obtain to have bright screen and the less liquid crystal display device that glimmers. Therefore, the present invention can be widely used in the broad industrial circle that uses liquid crystal display device, and such as TV, image pickup device, portable terminal, projecting apparatus etc., and its practicality is very high.

Claims (19)

1. liquid crystal display device comprises:
Display panel, comprise PEL matrix and be oppositely arranged with described PEL matrix, and between them, accompany the counter electrode of liquid crystal layer, in described PEL matrix, each pixel that all comprises on-off element and pixel capacitors at least is arranged to matrix near the intersection point of the data line of vertical and horizontal setting and gate line; And
Control part is used for showing that the cycle of a color image frame is divided into a plurality of period of sub-frame, and lights light sources of different colors for each period of sub-frame, thereby according to color display image on display panel of light source, wherein
Between pixel capacitors and data line, be provided with the guarded electrode layer that separates by dielectric film,
Wherein, by changing waveform for each period of sub-frame, described control part will be applied to described guarded electrode layer with the voltage that is applied to described counter electrode voltage inequality, and
Wherein, the response time of the liquid crystal material of filling in the liquid crystal layer is less than described period of sub-frame.
2. liquid crystal display device according to claim 1, wherein for each period of sub-frame, the vision signal that control part will be written to all pixels of PEL matrix is made as identical with respect to the polarity of counter electrode, and changes the waveform of the voltage that is applied to the guarded electrode layer with respect to the polarity of counter electrode according to vision signal.
3. liquid crystal display device according to claim 1, wherein control part is divided into two cycles at least with each period of sub-frame, promptly be used for writing the write cycle and the display cycle that is used for a bright light source of vision signal, and in the display cycle, change the voltage waveform that is applied to the guarded electrode layer to PEL matrix.
4. liquid crystal display device according to claim 1 comprises the luminescent device that is used for shining high directivity light to display panel on two different directions.
5. liquid crystal display device according to claim 4, wherein:
Luminescent device sees through pixel and gives the light of first viewing location irradiation towards the emission of one of two different directions, and gives the light of second viewing location irradiation towards another direction emission through pixel; And
By giving the luminescent device output order, alternately irradiation is towards the light of two different directions emissions for per two continuous period of sub-frame, and according to the irradiation direction of light, control part is the first viewing location display image or is the second viewing location display image.
6. liquid crystal display device according to claim 4, wherein:
Luminescent device sees through pixel and gives the light of beholder's right eye irradiation towards the emission of one of two different directions, and gives the light of beholder's left eye irradiation towards another direction emission through pixel; And
By giving the luminescent device output order, alternately irradiation is towards the light of two different directions emissions for per two continuous period of sub-frame, and according to the irradiation direction of light, control part is the right eye display image or is the left eye display image.
7. control system that is used for the drive controlling display panel, this display panel comprises: PEL matrix and be oppositely arranged with PEL matrix, and between them, accompany the counter electrode of liquid crystal layer, in PEL matrix, each pixel that all comprises on-off element and pixel capacitors at least is arranged to matrix near the intersection point of the data line of vertical and horizontal setting and gate line, described control system comprises:
Control part is used for showing that the cycle of a color image frame is divided into a plurality of period of sub-frame, and lights light sources of different colors for each period of sub-frame, thereby according to color display image on display panel of light source, wherein
Control part applies voltage for the guarded electrode layer that is arranged between pixel capacitors and the data line, and
Wherein, by changing waveform for each period of sub-frame, described control part will be applied to described guarded electrode layer with the voltage that is applied to described counter electrode voltage inequality, and
Wherein, the response time of the liquid crystal material of filling in the liquid crystal layer is less than described period of sub-frame.
8. control system according to claim 7, wherein for each period of sub-frame, the vision signal that control part will be written to all pixels of PEL matrix is made as identical with respect to the polarity of counter electrode, and changes the waveform of the voltage that is applied to the guarded electrode layer with respect to the polarity of counter electrode according to vision signal.
9. control system according to claim 7, wherein control part is divided into two cycles at least with each period of sub-frame, promptly be used for writing the write cycle and the display cycle that is used for a bright light source of vision signal, and in the display cycle, change the voltage waveform that is applied to the guarded electrode layer to PEL matrix.
10. control system according to claim 7, control part drive controlling luminescent device wherein, with on two different directions to the light of display panel irradiation high directivity.
11. control system according to claim 10, wherein:
Luminescent device sees through pixel and gives the light of first viewing location irradiation towards the emission of one of two different directions, and gives the light of second viewing location irradiation towards another direction emission through pixel; And
By giving the luminescent device output order, alternately irradiation is towards the light of two different directions emissions for per two continuous period of sub-frame, and according to the irradiation direction of light, control part is the first viewing location display image or is the second viewing location display image.
12. control system according to claim 10, wherein:
Luminescent device sees through pixel and gives the light of beholder's right eye irradiation towards the emission of one of two different directions, and gives the light of beholder's left eye irradiation towards another direction emission through pixel; And
By giving the luminescent device output order, alternately irradiation is towards the light of two different directions emissions for per two continuous period of sub-frame, and according to the irradiation direction of light, control part is the right eye display image or is the left eye display image.
13. the driving method of a display image on display panel, this display panel comprises: PEL matrix and be oppositely arranged with PEL matrix, and between them, accompany the counter electrode of liquid crystal layer, in PEL matrix, each pixel that all comprises on-off element and pixel capacitors at least is arranged to matrix near the intersection point of the data line of vertical and horizontal setting and gate line, this method comprises:
The cycle that shows a color image frame is divided into a plurality of period of sub-frame, and lights light sources of different colors for each period of sub-frame, thereby according to color display image on display panel of light source;
Apply voltage for the guarded electrode layer that is arranged between pixel capacitors and the data line, and,
By changing waveform for each period of sub-frame, will be applied to described guarded electrode layer with the voltage that is applied to described counter electrode voltage inequality, and,
Wherein, the response time of the liquid crystal material of filling in the liquid crystal layer is less than described period of sub-frame.
14. driving method according to claim 13, wherein for each period of sub-frame, the vision signal that is written to all pixels of PEL matrix is made as identical with respect to the polarity of counter electrode, and changes the waveform of the voltage that is applied to the guarded electrode layer with respect to the polarity of counter electrode according to vision signal.
15. driving method according to claim 13, comprise: each period of sub-frame is divided into two cycles at least, promptly be used for writing the write cycle and the display cycle that is used for a bright light source of vision signal, and in the display cycle, change the voltage waveform that is applied to the guarded electrode layer to PEL matrix.
16. driving method according to claim 13, comprise: each period of sub-frame is divided into two cycles at least, promptly be used for writing the cycle of vision signal and being used for the display cycle of a bright light source, and in the display cycle, apply the correction voltage different with vision signal to data line to PEL matrix.
17. driving method according to claim 13 comprises: the light that on two different directions, shines high directivity to display panel.
18. driving method according to claim 17 comprises:
See through pixel and give the light of first viewing location irradiation, and give the light of second viewing location irradiation towards another direction emission through pixel towards the emission of one of two different directions; And
By giving the luminescent device output order, for per two continuous period of sub-frame alternately irradiation, be the first viewing location display image or be the second viewing location display image according to the irradiation direction of light towards the light of two different directions emissions.
19. driving method according to claim 17 comprises:
See through pixel and give the light of beholder's right eye irradiation, and give the light of beholder's left eye irradiation towards another direction emission through pixel towards the emission of one of two different directions; And
By giving the luminescent device output order, for per two continuous period of sub-frame alternately irradiation towards the light of two different directions emissions, according to the irradiation direction of light, for the right eye display image or be the left eye display image.
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