WO2010146747A1 - アクティブマトリクス基板、液晶パネル、液晶表示装置、液晶表示ユニット、テレビジョン受像機 - Google Patents
アクティブマトリクス基板、液晶パネル、液晶表示装置、液晶表示ユニット、テレビジョン受像機 Download PDFInfo
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
- G09G3/3659—Control of matrices with row and column drivers using an active matrix the addressing of the pixel involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependant on signal of two data electrodes
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
- G02F1/134345—Subdivided pixels, e.g. for grey scale or redundancy
- G02F1/134354—Subdivided pixels, e.g. for grey scale or redundancy the sub-pixels being capacitively coupled
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/13624—Active matrix addressed cells having more than one switching element per pixel
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- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/04—Structural and physical details of display devices
- G09G2300/0421—Structural details of the set of electrodes
- G09G2300/0426—Layout of electrodes and connections
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/04—Structural and physical details of display devices
- G09G2300/0439—Pixel structures
- G09G2300/0443—Pixel structures with several sub-pixels for the same colour in a pixel, not specifically used to display gradations
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/04—Structural and physical details of display devices
- G09G2300/0439—Pixel structures
- G09G2300/0443—Pixel structures with several sub-pixels for the same colour in a pixel, not specifically used to display gradations
- G09G2300/0447—Pixel structures with several sub-pixels for the same colour in a pixel, not specifically used to display gradations for multi-domain technique to improve the viewing angle in a liquid crystal display, such as multi-vertical alignment [MVA]
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- G—PHYSICS
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
- G09G2300/0876—Supplementary capacities in pixels having special driving circuits and electrodes instead of being connected to common electrode or ground; Use of additional capacitively coupled compensation electrodes
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0243—Details of the generation of driving signals
- G09G2310/0251—Precharge or discharge of pixel before applying new pixel voltage
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- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0204—Compensation of DC component across the pixels in flat panels
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- G—PHYSICS
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/028—Improving the quality of display appearance by changing the viewing angle properties, e.g. widening the viewing angle, adapting the viewing angle to the view direction
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3674—Details of drivers for scan electrodes
- G09G3/3677—Details of drivers for scan electrodes suitable for active matrices only
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3685—Details of drivers for data electrodes
- G09G3/3688—Details of drivers for data electrodes suitable for active matrices only
Definitions
- the present invention relates to an active matrix substrate in which a plurality of pixel electrodes are provided in one pixel region, and a liquid crystal display device (pixel division method) using the same.
- a plurality of subpixels provided in one pixel are controlled to have different luminances, and the area level of these subpixels.
- a liquid crystal display device pixel division method, for example, see Patent Document 1 that displays a halftone by a tone.
- a pixel region is provided between two adjacent gate bus lines 112, and at the upper end of the pixel region (a portion adjacent to the gate bus line).
- the pixel electrode 121a is arranged, the pixel electrode 121b is arranged in the middle stage, the pixel electrode 121c is arranged at the lower end (the part adjacent to the adjacent gate bus line), and the pixel electrode 121a and the pixel electrode 121c are the source electrode of the transistor 116
- the control electrode 118 connected to the source lead wiring 119 led out from 116s and connected to the source lead wiring 119 overlaps with the pixel electrode 121b through the insulating layer, and the middle pixel electrode 121b has pixel electrodes 121a and 121c, respectively.
- each of the sub-pixels corresponding to the pixel electrodes 121a and 121c can be a bright sub-pixel, and the sub-pixel corresponding to the pixel electrode 121b can be a dark sub-pixel.
- Halftone can be displayed by area gradation of dark sub-pixel (1).
- the transistor 56 is turned on every frame, so that the pixel electrode 61b and the source line 55 are turned on.
- the charge accumulated in the pixel electrode 61b while the transistor 56 is off flows to the source line 55 during the on period. Therefore, almost no direct-current voltage component remains on the pixel electrode 61b, and image sticking hardly occurs.
- the pixel electrode 61a that is capacitively coupled to the pixel electrode 61b even if the transistor 56 is turned on, the charge accumulated in the pixel electrode 61a is held as it is. Therefore, a DC voltage component remains in the pixel electrode 61a, and the sub-pixel including the pixel electrode 61a is burned due to this.
- the pixel electrode 121b that is capacitively coupled to the pixel electrode 121a is separated from the gate bus line 112 as shown in FIG. Arranged. That is, by disposing the pixel electrode 121b between the pixel electrode 121a and the pixel electrode 121c, it is possible to suppress the inflow of electric charge to the pixel electrode 121b due to the DC voltage component of the signal flowing through the gate bus line 112. Thereby, the occurrence of image sticking can be suppressed.
- Non-Patent Document 1 describes a configuration in which the pixel electrode in the floating state as described above is directly connected to a source line via a transistor.
- FIG. 50 is an equivalent circuit diagram showing a part of the liquid crystal panel described in Non-Patent Document 1. As shown in the figure, this liquid crystal panel is provided with a pixel region (main pixel region (Main region), sub-pixel region (Sub region)) between two adjacent gate bus lines. The corresponding main pixel electrode is connected to the source line (Data line) via the first transistor (Main-TFT), and the sub-pixel electrode corresponding to the sub-pixel region is connected to the second transistor (Sub-TFT). Connected to the source line. The first and second transistors are connected to the same gate bus line (Gate line).
- the source line and the subpixel electrode are electrically connected, so that the charge accumulated in the subpixel electrode is discharged (refreshed).
- the occurrence of burn-in of the subpixel including the pixel electrode in the floating state can be suppressed.
- Japanese Patent Publication Japanese Patent Laid-Open No. 2006-39290 (published on February 9, 2006)”
- Non-Patent Document 1 the main pixel electrode and the subpixel electrode are connected to the same gate bus line and the same source line via the first and second transistors, respectively.
- the ON times (gate ON times) of the first and second transistors are equal to each other.
- the potential supplied to the pixel electrode is defined by the transistor characteristic ratio, that is, the W / L ratio of the channel of the transistor (the ratio of the channel width W to the channel length L).
- the transistor characteristic ratio that is, the W / L ratio of the channel of the transistor (the ratio of the channel width W to the channel length L).
- liquid crystal panels having different driving frequencies for example, a liquid crystal panel driven by 60 Hz and a liquid crystal panel driven by 120 Hz.
- driving frequencies for example, a liquid crystal panel driven by 60 Hz and a liquid crystal panel driven by 120 Hz.
- the present invention proposes a configuration in which there is little risk of deterioration of display quality due to sub-pixel burn-in in a capacitively coupled pixel division type liquid crystal display device.
- the first and second pixel electrodes are provided in one pixel region, and the data signal line, the first and second scanning signal lines, and the data corresponding to the one pixel region are provided.
- a first transistor connected to the signal line and the first scanning signal line, and a second transistor connected to the data signal line and the second scanning signal line are provided, and the first pixel electrode is connected to the first transistor.
- the second pixel electrode is connected to the first pixel electrode via a capacitor and connected to the data signal line via the second transistor, and is connected to the data signal line via the second transistor.
- a storage capacitor is provided between at least one of the first and second pixel electrodes provided in the pixel region and at least one of the first and second scanning signal lines corresponding to the previous pixel region. Made is characterized in that is.
- each pixel electrode in one pixel region is connected to a data signal line through a transistor connected to a different scanning signal line.
- the supply timing can be made different for each pixel electrode. Therefore, for example, before supplying a normal writing signal potential to one pixel electrode, the other pixel electrode capacitively coupled to the pixel electrode is electrically connected to the data signal line through a transistor.
- a signal potential eg, Vcom
- the data signal line is not connected to the pixel electrode (capacitive coupling electrode) that is capacitively coupled to the pixel electrode connected to the data signal line through the transistor without passing through the capacitor. Since the signal potential can be supplied from the capacitor, charges accumulated in the capacitive coupling electrode can be discharged (refreshed). Therefore, it is possible to suppress the occurrence of burn-in of the sub-pixel including the pixel electrode. Further, according to the above configuration, it is not necessary to adjust the channel W / L ratio of the transistor as in the conventional case, and the active matrix substrate can be configured with the same channel size. Therefore, a reduction in display quality due to variations in transistor characteristics can be suppressed, and a common liquid crystal panel can be achieved.
- the storage capacitance of the pixel electrode provided in the pixel region of the own stage is the scanning signal line (first and second scanning signal lines) provided corresponding to the pixel region of the previous stage where the scanning is completed. Therefore, it is possible to increase the value of the storage capacitor and to suppress fluctuations in the value of the storage capacitor. Therefore, display quality can be improved.
- This liquid crystal display device includes any of the active matrix substrates described above, and the second scanning signal line is selected at least once during display.
- the second pixel electrode capacitively coupled to the first pixel electrode connected to the data signal line via the first transistor is electrically connected to the data signal line via the second transistor. Therefore, the charges accumulated in the second pixel electrode can be discharged (refreshed). Therefore, it is possible to suppress the occurrence of burn-in of the subpixel including the second pixel electrode, and it is possible to suppress the display quality from being deteriorated.
- This liquid crystal panel includes the above active matrix substrate.
- the present liquid crystal display unit includes the liquid crystal panel and a driver.
- the liquid crystal display device includes the liquid crystal display unit and a light source device.
- the present television receiver includes the above-described liquid crystal display device and a tuner unit that receives a television broadcast.
- the charge accumulated in the pixel electrode capacitively coupled to the pixel electrode connected to the data signal line through the transistor can be discharged (refreshed). Therefore, it is possible to suppress the occurrence of burn-in of the sub-pixel including the pixel electrode, and it is possible to suppress the display quality from being deteriorated.
- FIG. 4 is a plan view showing a configuration (specific example 1-1) of a liquid crystal panel 5a.
- FIG. 3 is a cross-sectional view showing a specific example of a cross section AB in FIG. 2.
- FIG. 3 is a cross-sectional view showing a specific example of a CD cross section of FIG. 2.
- FIG. 5 is a cross-sectional view showing another specific example of the cross section AB in FIG. 2. It is a top view which shows the other structure of the liquid crystal panel 5a of FIG. It is a top view which shows the other structure (specific example 1-2) of the liquid crystal panel 5a.
- FIG. 9 is a plan view showing a state in which each sub-pixel region is divided into four liquid crystal domains A to D in the liquid crystal panel 5a of FIG. It is a timing chart which shows the drive method of the liquid crystal display device provided with liquid crystal panel 5a * 5b. It is a schematic diagram which shows the display state of each flame
- 14 is a timing chart illustrating a method for driving the gate driver of FIG. 13. It is a timing chart which shows the other drive method of the liquid crystal display device provided with liquid crystal panel 5a * 5b. It is a timing chart which shows the other drive method of the liquid crystal display device provided with liquid crystal panel 5a * 5b. It is a circuit diagram which shows the other structure of the gate driver which drives liquid crystal panel 5a * 5b. 18 is a timing chart showing a method for driving the gate driver of FIG. It is a timing chart which shows the other drive method of the liquid crystal display device provided with liquid crystal panel 5a * 5b. It is a circuit diagram which shows the other structure of the gate driver which drives liquid crystal panel 5a * 5b.
- FIG. 21 is a timing chart showing a method for driving the gate driver of FIG. 20. It is a timing chart which shows the other drive method of the liquid crystal display device provided with liquid crystal panel 5a * 5b.
- FIG. 7 is a plan view showing a configuration (specific example 1-4) of a liquid crystal panel 5a.
- FIG. 24 is a schematic diagram showing a display state of each frame when the driving method of FIG. 10 is used in the liquid crystal panel 5a of FIG. It is a circuit diagram which shows the other structure of the liquid crystal panel 5a.
- FIG. 6 is a plan view showing a configuration (specific example 1-5) of a liquid crystal panel 5a.
- FIG. 27 is a schematic diagram showing a display state of each frame when the driving method of FIG.
- FIG. 7 is a plan view showing a configuration (specific example 1-6) of a liquid crystal panel 5a. It is a timing chart which shows the other drive method of the liquid crystal display device provided with liquid crystal panel 5a * 5b.
- FIG. 29 is a schematic diagram showing a display state of each frame when the driving method of FIG. 29 is used in the liquid crystal panel 5a of FIGS. It is a circuit diagram which shows the structure of the liquid crystal panel 5b.
- FIG. 7 is a plan view showing a configuration (specific example 2-1) of a liquid crystal panel 5b.
- FIG. 33 is a cross-sectional view showing a specific example of a cross section AB in FIG. 32.
- FIG. 7 is a plan view showing a configuration (specific example 2-2) of a liquid crystal panel 5b. It is a circuit diagram which shows the other structure of the liquid crystal panel 5b.
- FIG. 7 is a plan view showing a configuration (specific example 2-3) of a liquid crystal panel 5b.
- FIG. 6 is a plan view showing a configuration (specific example 2-4) of a liquid crystal panel 5b.
- It is a top view which shows the structure of the liquid crystal panel 5a of a MVA structure. It is the top view to which a part of liquid crystal panel 5a of FIG. 39 was expanded.
- FIG. 26 is a block diagram illustrating functions of the present television receiver. It is a disassembled perspective view which shows the structure of this television receiver. It is a top view which shows the structure of the conventional liquid crystal panel. It is a top view which shows the structure of the conventional liquid crystal panel. It is a circuit diagram which shows the structure of the conventional liquid crystal panel.
- the extending direction of the scanning signal lines is hereinafter referred to as the row direction.
- the scanning signal line may be extended in the horizontal direction or in the vertical direction. Needless to say.
- the channel characteristics (n-type and p-type) of the transistor described in this embodiment are not particularly limited.
- FIG. 1 is an equivalent circuit diagram showing a part of the liquid crystal panel according to the first embodiment.
- the liquid crystal panel 5a includes data signal lines (15x and 15X) extending in the column direction (up and down direction in the figure) and scanning signal lines (16a to 16f) extending in the row direction (left and right direction in the figure). ), Pixels (100 to 105) arranged in the row and column directions, and a common electrode (counter electrode) com, and the structure of each pixel is the same. Note that a pixel column including the pixels 100 to 102 and a pixel column including the pixels 103 to 105 are adjacent to each other.
- one data signal line and two scanning signal lines are provided corresponding to one pixel, and two pixel electrodes 17 c and 17 d provided in the pixel 100 and a pixel 101 are provided.
- the two pixel electrodes 17 a and 17 b provided in the pixel 102 and the two pixel electrodes 17 e and 17 f provided in the pixel 102 are arranged in a line, and the two pixel electrodes 17 C and 17 D provided in the pixel 103 are provided in the pixel 104.
- the two pixel electrodes 17A and 17B and the two pixel electrodes 17E and 17F provided in the pixel 105 are arranged in a line, the pixel electrodes 17c and 17C, the pixel electrodes 17d and 17D, the pixel electrodes 17a and 17A, and the pixel electrode 17b and 17B, pixel electrodes 17e and 17E, and pixel electrodes 17f and 17F are adjacent to each other in the row direction.
- each pixel Since the structure of each pixel is the same, the following description will be given mainly using the pixel 101 as an example.
- pixel electrodes 17a and 17b are connected via a coupling capacitor C101, and the pixel electrode 17a is connected to a scanning signal line 16a (first scanning signal line).
- the data signal line 15x is connected to the data signal line 15x via the (first transistor), and the pixel electrode 17b is connected to the data signal line 15x via the transistor 12b (second transistor) connected to the scanning signal line 16b (second scanning signal line).
- a storage capacitor Cha is formed between the pixel electrode 17a and the previous scanning signal line 16d
- a storage capacitor Chb is formed between the pixel electrode 17b and the previous scanning signal line 16d
- the pixel electrode 17a and A liquid crystal capacitor Cla is formed between the common electrodes com
- a liquid crystal capacitor Clb is formed between the pixel electrode 17b and the common electrode com.
- the transistors 12a and 12b are formed so that the W / L ratio of the channel (the ratio of the channel width W to the channel length L; hereinafter referred to as “W / L ratio”) is substantially equal to each other. That is, since the sizes of the transistors of the liquid crystal panel 5a are substantially equal to each other, the characteristics of the transistors are substantially the same.
- the potential of the pixel electrode 17b after the transistor 12a is turned off is Va ⁇ (C ⁇ / (C ⁇ + Co)).
- the sub-pixel including the pixel electrode 17a is a bright sub-pixel (hereinafter “bright”), and the sub-pixel including the pixel electrode 17b is a dark sub-pixel (hereinafter “dark”).
- a pixel division type liquid crystal display device can be realized.
- the pixel electrodes 17a and 17b in one pixel 101 region are respectively connected to different scanning signal lines 16a and 16b. And connected to the data signal line 15x. Therefore, the same or different signal potential can be directly supplied to the pixel electrodes 17a and 17b via the transistors 12a and 12b. That is, for the pixel electrode 17b (hereinafter also referred to as “capacitive coupling electrode”) that is capacitively coupled to the pixel electrode 17a that is connected to the data signal line 15x via the transistor 12a, the data signal line 15x does not pass through the capacitance. The signal potential can be supplied from.
- the supply timing of the signal potential supplied to the pixel electrodes 17a and 17b is arbitrary. Can also be set.
- the capacitive coupling electrode (pixel electrode 17b) can be electrically connected to the data signal line (15x) by turning on the transistor 12b. Therefore, a signal potential can be supplied from the data signal line 15x to the pixel electrode 17b via the transistor 12b.
- a signal potential for example, a Vcom signal
- the signal potential (Vcom) may be supplied by a charge sharing method, or may be supplied to all data signal lines by turning on all transistors. Accordingly, since the signal potential (Vcom) is written to the pixel electrode 17b that is capacitively coupled, the charge accumulated in the pixel electrode can be discharged (refreshed). Therefore, it is possible to suppress the occurrence of burn-in of the sub-pixel including the pixel electrode.
- the active matrix substrate can be configured with the same channel size.
- deterioration in display quality due to variations in transistor characteristics can be suppressed.
- the liquid crystal display device of the present invention mainly exhibits the above-described configuration and unique effects.
- the specific example of the liquid crystal panel 5a which comprises the liquid crystal display device of this embodiment, and its drive method are demonstrated.
- FIG. 1 A specific example 1-1 of the liquid crystal panel 5a is shown in FIG.
- the data signal line 15 x is provided along the pixel 100 and the pixel 101
- the data signal line 15 X is provided along the pixel 103 and the pixel 104.
- the scanning signal line 16c is disposed so as to overlap with one of the two edge portions along the row direction of the pixel 100, and the scanning signal line 16d is disposed so as to overlap with the other.
- Pixel electrodes 17c and 17d are arranged in the column direction between 16c and 16d.
- the scanning signal line 16c overlaps one of the two edge portions along the row direction of the pixel 103, and the scanning signal line 16d overlaps the other, and the pixel between the scanning signal lines 16c and 16d is seen in plan view.
- Electrodes 17C and 17D are arranged in the column direction.
- the scanning signal line 16a is formed so as to overlap with one of the two edge portions along the row direction of the pixel 101, and the scanning signal line 16b is formed so as to overlap with the other, and the scanning signal line 16a is viewed in plan view.
- pixel electrodes 17a and 17b are arranged in the column direction. Further, the scanning signal line 16a overlaps one of the two edge portions along the row direction of the pixel 104, and the scanning signal line 16b overlaps the other, and the pixel between the scanning signal lines 16a and 16b is seen in plan view. Electrodes 17A and 17B are arranged in the column direction.
- the source electrode 8a and the drain electrode 9a of the transistor 12a are formed on the scanning signal line 16a, and the source electrode 8b and the drain electrode 9b of the transistor 12b are formed on the scanning signal line 16b.
- the source electrode 8a is connected to the data signal line 15x.
- the drain electrode 9a is connected to the drain lead wiring 27a, the drain lead wiring 27a is connected to the contact electrode 77a and the coupling capacitance electrode 37a, and the contact electrode 77a is connected to the pixel electrode 17a through the contact hole 11a and has a coupling capacitance.
- the electrode 37a overlaps with the pixel electrode 17b via an interlayer insulating film, thereby forming a coupling capacitor C101 (see FIG.
- the drain electrode 9a is connected to the drain lead wire 28a, the drain lead wire 28a is connected to the storage capacitor electrode 38a formed in the same layer as the coupling capacitor electrode 37a, and the storage capacitor electrode 38a is scanned through the gate insulating film. This overlaps with the signal line 16d, thereby forming a storage capacitor Cha (see FIG. 1).
- the source electrode 8b of the transistor 12b is connected to the data signal line 15x.
- the drain electrode 9b is connected to the drain lead wiring 27b, the drain lead wiring 27b is connected to the contact electrode 77b, and the contact electrode 77b is connected to the pixel electrode 17b through the contact hole 11b.
- the storage capacitor electrode 38b formed in the same layer as the storage capacitor electrode 38a overlaps the scanning signal line 16d through the gate insulating film and is connected to the lead-out wiring 28b.
- the lead-out wiring 28b is connected to the contact electrode 78b.
- the contact electrode 78b is connected to the pixel electrode 17b through the contact hole 12b.
- the holding capacitor Chb (see FIG. 1) is formed. Note that the configuration of other pixels (the shape, arrangement, and connection relationship of each member) is the same as that of the pixel 101.
- the sub-pixel including the pixel electrode 17a is “bright”, and the sub-pixel including the pixel electrode 17b is “dark”.
- FIG. 3 is a cross-sectional view taken along the line AB of FIG.
- the liquid crystal panel 5a includes an active matrix substrate 3, a color filter substrate 30 facing the active matrix substrate 3, and a liquid crystal layer 40 disposed between the substrates (3, 30).
- the scanning signal lines 16a and 16b are formed on the glass substrate 31, and the inorganic gate insulating film 22 is formed so as to cover them.
- the inorganic gate insulating film 22 there are a semiconductor layer 24 (i layer and n + layer), a source electrode 8a in contact with the n + layer, a drain electrode 9a, drain lead wires 27a and 27b, contact electrodes 77a and 77b, and a coupling capacitor electrode 37a.
- An inorganic interlayer insulating film 25 is formed so as to cover them.
- Pixel electrodes 17a and 17b are formed on the inorganic interlayer insulating film 25, and an alignment film (not shown) is formed so as to cover these (pixel electrodes 17a and 17b).
- the inorganic interlayer insulating film 25 is penetrated, whereby the pixel electrode 17a and the contact electrode 77a are connected, and the pixel electrode 17b and the contact electrode 77b are connected.
- the coupling capacitor electrode 37a connected to the drain lead wiring 27a overlaps the pixel electrode 17b through the inorganic interlayer insulating film 25, thereby forming the coupling capacitor C101 (see FIG. 1).
- the black matrix 13 and the colored layer 14 are formed on the glass substrate 32, the common electrode (com) 28 is formed thereon, and an alignment film (not shown) is formed so as to cover this. Is formed.
- FIG. 4 is a cross-sectional view taken along the line CD of FIG. Similar to FIG. 3, the liquid crystal panel 5 a includes an active matrix substrate 3, a color filter substrate 30 facing the active matrix substrate 3, and a liquid crystal layer 40 disposed between both substrates (3 and 30).
- the scanning signal lines 16d and 16a are formed on the glass substrate 31, and the inorganic gate insulating film 22 is formed so as to cover them.
- the storage capacitor electrodes 38a and 38b, the lead-out wiring 28b, and the contact electrode 78b are formed, and the inorganic interlayer insulating film 25 is formed so as to cover them.
- Pixel electrodes 17a and 17b are formed on the inorganic interlayer insulating film 25, and an alignment film (not shown) is formed so as to cover these (pixel electrodes 17a and 17b).
- the inorganic interlayer insulating film 25 is penetrated, whereby the pixel electrode 17b and the contact electrode 78b are connected.
- the storage capacitor electrode 38a connected to the drain lead wiring 28a overlaps the scanning signal line 16d through the inorganic gate insulating film 22, thereby forming the storage capacitor Cha (see FIG. 1).
- the storage capacitor electrode 38b connected to the drain lead-out line 28b overlaps the scanning signal line 16d through the inorganic gate insulating film 22, thereby forming the storage capacitor Chb (see FIG. 1).
- the black matrix 13 and the colored layer 14 are formed on the glass substrate 32, the common electrode (com) 28 is formed thereon, and an alignment film (not shown) is formed so as to cover this. Is formed.
- a transparent insulating substrate such as glass or plastic
- a metal film such as titanium, chromium, aluminum, molybdenum, tantalum, tungsten, copper, or an alloy film thereof or a laminated film thereof.
- a method such as a sputtering method with a film thickness of 1000 to 3000 mm, and this is patterned into a necessary shape by a photo-etching method, whereby a scanning signal line or the like (which functions as a gate electrode of each transistor) is formed.
- a silicon nitride film (SiNx) serving as a gate insulating film, a high resistance semiconductor layer made of amorphous silicon, polysilicon, or the like, and a low resistance semiconductor layer such as n + amorphous silicon are formed by a plasma CVD (chemical vapor deposition) method or the like.
- a plasma CVD chemical vapor deposition
- the silicon nitride film as the gate insulating film has a thickness of about 3000 to 5000 mm, for example, and the amorphous silicon film as the high resistance semiconductor layer has a film thickness of about 1000 to 3000 mm, for example, and n + as the low resistance semiconductor layer.
- the amorphous silicon film has a thickness of about 400 to 700 mm, for example.
- a metal film such as titanium, chromium, aluminum, molybdenum, tantalum, tungsten, copper, or an alloy film thereof, or a laminated film thereof is formed with a film thickness of 1000 to 3000 mm by a method such as sputtering, and photoetching is performed.
- Data signal lines, source electrodes, drain electrodes, and the like are formed by patterning into a necessary shape by a method or the like.
- a high resistance semiconductor layer such as an amorphous silicon film and a low resistance semiconductor layer (n + layer) such as an n + amorphous silicon film
- patterns such as data signal lines, source electrodes, and drain electrodes are used as masks.
- channel etching is performed by dry etching.
- the film thickness of the i layer is optimized, and each transistor (channel region) is formed.
- the semiconductor layer not covered with the mask is removed by etching, leaving the i-layer thickness necessary for the capability of each transistor.
- an inorganic insulating film such as silicon nitride or silicon oxide is formed as an interlayer insulating film so as to cover the data signal line, the source electrode, the drain electrode, and the like.
- a silicon nitride film (passivation film) having a thickness of about 2000 to 5000 mm is formed by plasma CVD or the like.
- the interlayer insulating film is etched to form a hole.
- the photosensitive resist is patterned by photolithography (exposure and development), and etching is performed.
- a transparent conductive film such as ITO (Indium Tin Oxide), IZO, zinc oxide, tin oxide or the like is formed on the interlayer insulating film with a film thickness of about 1000 to 2000 mm by sputtering or the like.
- the first and second pixel electrodes are formed in each pixel region by patterning this into a necessary shape by a photoetching method or the like.
- an alignment film is applied by an inkjet method or the like so as to cover each pixel electrode.
- the cross section AB of FIG. 3 can be configured as shown in FIG. That is, the thick organic gate insulating film 21 and the thin inorganic gate insulating film 22 are formed on the glass substrate 31, and the thin inorganic interlayer insulating film 25 and the thick organic interlayer insulating film 26 are formed below the pixel electrode. By doing so, the effects of reducing various parasitic capacitances and preventing short-circuiting between wirings can be obtained.
- the organic interlayer insulating film 26 penetrates the portion located on the coupling capacitor electrode 37a. In this way, the capacitance value of the coupling capacitor C101 can be increased.
- the inorganic interlayer insulating film 25, the organic interlayer insulating film 26, and the contact holes 11a and 11b in FIG. 5 can be formed as follows. That is, after forming a transistor (TFT), an inorganic interlayer insulating film 25 (passivation film) made of SiNx having a thickness of about 3000 mm so as to cover the entire surface of the substrate using a mixed gas of SiH4 gas, NH3 gas, and N2 gas. Is formed by CVD. Thereafter, an organic interlayer insulating film 26 made of a positive photosensitive acrylic resin having a thickness of about 3 ⁇ m is formed by spin coating or die coating.
- TFT transistor
- an inorganic interlayer insulating film 25 (passivation film) made of SiNx having a thickness of about 3000 mm so as to cover the entire surface of the substrate using a mixed gas of SiH4 gas, NH3 gas, and N2 gas. Is formed by CVD.
- a mixed gas of CF 4 gas and O 2 gas Is used to dry-etch the inorganic interlayer insulating film 25.
- the penetration portion of the organic interlayer insulating film is half-exposed in the photolithography process so that the organic interlayer insulating film remains thin when development is completed, while the contact hole portion is By performing full exposure in the photolithography process, an organic interlayer insulating film is not left when development is completed.
- the organic gate insulating film 21 and the organic interlayer insulating film 26 may be, for example, an insulating film made of a SOG (spin-on glass) material, and the organic gate insulating film 21 and the organic interlayer insulating film 26 are made of acrylic resin. , At least one of an epoxy resin, a polyimide resin, a polyurethane resin, a novolac resin, and a siloxane resin may be contained.
- the liquid crystal panel 5a is configured as shown in FIG. 5.
- the pixel electrode 17 b is formed so as to overlap the scanning signal line 16 b through the inorganic interlayer insulating film 25 and the thick organic interlayer insulating film 26.
- the parasitic capacitance between the pixel electrode 17b and the scanning signal line 16b can be reduced, and in particular, the aperture ratio can be improved while suppressing an increase in the load on the scanning signal line 16b.
- FIG. 7 A specific example 1-2 of the liquid crystal panel 5a is shown in FIG.
- a part of the coupling capacitor 37a and the drain lead wiring 27a connected thereto is omitted in the liquid crystal panel of FIG.
- the data signal line 15x is provided along the pixel 100 and the pixel 101
- the data signal line 15X is provided along the pixel 103 and the pixel 104. Yes.
- the scanning signal line 16c is disposed so as to overlap with one of the two edge portions along the row direction of the pixel 100, and the scanning signal line 16d is disposed so as to overlap with the other.
- Pixel electrodes 17c and 17d are arranged in the column direction between 16c and 16d.
- the scanning signal line 16c overlaps one of the two edge portions along the row direction of the pixel 103, and the scanning signal line 16d overlaps the other, and the pixel between the scanning signal lines 16c and 16d is seen in plan view.
- Electrodes 17C and 17D are arranged in the column direction.
- the scanning signal line 16a is formed so as to overlap with one of the two edge portions along the row direction of the pixel 101, and the scanning signal line 16b is formed so as to overlap with the other, and the scanning signal line 16a is viewed in plan view.
- pixel electrodes 17a and 17b are arranged in the column direction. Further, the scanning signal line 16a overlaps one of the two edge portions along the row direction of the pixel 104, and the scanning signal line 16b overlaps the other, and the pixel between the scanning signal lines 16a and 16b is seen in plan view. Electrodes 17A and 17B are arranged in the column direction.
- the source electrode 8a and the drain electrode 9a of the transistor 12a are formed on the scanning signal line 16a, and the source electrode 8b and the drain electrode 9b of the transistor 12b are formed on the scanning signal line 16b.
- the source electrode 8a is connected to the data signal line 15x.
- the drain electrode 9a is connected to the drain lead wiring 27a, the drain lead wiring 27a is connected to the contact electrode 77a, and the contact electrode 77a is connected to the pixel electrode 17a through the contact hole 11a.
- the drain electrode 9a is connected to the drain lead wiring 28a, the drain lead wiring 28a is connected to the storage capacitor electrode 38a, and the storage capacitor electrode 38a overlaps the scanning signal line 16d through the gate insulating film.
- a storage capacitor Cha (see FIG. 1) is formed.
- the source electrode 8b of the transistor 12b is connected to the data signal line 15x.
- the drain electrode 9b is connected to the drain lead wiring 27b, the drain lead wiring 27b is connected to the contact electrode 77b, and the contact electrode 77b is connected to the pixel electrode 17b through the contact hole 11b.
- the coupling capacitor electrode 37b formed in the same layer as the storage capacitor electrode 38a overlaps with the pixel electrode 17a through the interlayer insulating film and is connected to the lead-out wiring 28b.
- the lead-out wiring 28b is connected to the contact electrode 78b.
- 78b is connected to the pixel electrode 17b through the contact hole 12b.
- the lead wiring 28b drawn from the coupling capacitor electrode 37b is connected to the storage capacitor electrode 38b, and the storage capacitor electrode 38b overlaps the scanning signal line 16d through the gate insulating film.
- the holding capacitor Chb (see FIG. 1) is formed. Note that the configuration of other pixels (the shape, arrangement, and connection relationship of each member) is the same as that of the pixel 101.
- the sub-pixel including the pixel electrode 17a is “bright”, and the sub-pixel including the pixel electrode 17b is “dark”.
- the aperture ratio can be improved.
- FIG. 8 Specific example of liquid crystal panel 1-3
- the coupling capacitor electrodes 37av and 37ah are arranged in a cross shape in the central portion of the dark sub-pixel region.
- the liquid crystal panel 5a is particularly suitable for an alignment division structure in which a plurality of liquid crystal domains are formed in one pixel region (subpixel region).
- viewing angle characteristics can be improved by forming a plurality of domains having different alignment directions (tilt directions).
- a technique related to this alignment division structure is disclosed in, for example, International Publication No. WO2008 / 069181.
- FIG. 9 shows a state in which each sub-pixel region is divided into four liquid crystal domains A to D.
- FIG. 9 illustrates the pixel 100 and the pixel 103, and each transistor is omitted.
- a cross-shaped dark line (dark line) indicated by a line CL is observed at a boundary portion where each of the liquid crystal domains A to D is adjacent to another liquid crystal domain. Therefore, when it is necessary to arrange a light-shielding member in the pixel region, the effective aperture ratio of the pixel can be improved by arranging it so as to overlap with the dark line.
- the coupling capacitance electrodes 37av and 37ah are arranged in a cross shape so as to overlap the dark line in the central portion of the sub-pixel region. Thereby, the fall of an aperture ratio can be suppressed.
- the data signal line 15x is provided along the pixel 100 and the pixel 101
- the data signal line 15X is provided along the pixel 103 and the pixel 104, as in the liquid crystal panel in FIG. Yes.
- the scanning signal line 16c is disposed so as to overlap one of the two edge portions along the row direction of the pixel 100, and the scanning signal line 16d is disposed so as to overlap the other, and the scanning signal lines 16c and 16d are viewed in plan view.
- Between the pixel electrodes 17c and 17d are arranged in the column direction.
- the scanning signal line 16c overlaps one of the two edge portions along the row direction of the pixel 103, and the scanning signal line 16d overlaps the other, and the pixel between the scanning signal lines 16c and 16d is seen in plan view.
- Electrodes 17C and 17D are arranged in the column direction.
- the scanning signal line 16a is formed so as to overlap with one of the two edge portions along the row direction of the pixel 101, and the scanning signal line 16b is formed so as to overlap with the other, and the scanning signal line 16a is viewed in plan view.
- pixel electrodes 17a and 17b are arranged in the column direction. Further, the scanning signal line 16a overlaps one of the two edge portions along the row direction of the pixel 104, and the scanning signal line 16b overlaps the other, and the pixel between the scanning signal lines 16a and 16b is seen in plan view. Electrodes 17A and 17B are arranged in the column direction.
- the source electrode 8a and the drain electrode 9a of the transistor 12a are formed on the scanning signal line 16a, and the source electrode 8b and the drain electrode 9b of the transistor 12b are formed on the scanning signal line 16b.
- the source electrode 8a is connected to the data signal line 15x.
- the drain electrode 9a is connected to the drain lead wiring 27a, the drain lead wiring 27a is connected to the contact electrode 77a, and the contact electrode 77a is connected to the pixel electrode 17a through the contact hole 11a.
- the drain electrode 9a is connected to the drain lead wiring 28a, the drain lead wiring 28a is connected to the storage capacitor electrode 38a, and the storage capacitor electrode 38a overlaps the scanning signal line 16d through the gate insulating film.
- a storage capacitor Cha see FIG.
- the coupling capacitor electrode 37av extending in the column direction and the coupling capacitor electrode 37ah extending in the row direction are formed in a cross shape in the same layer and overlap the pixel electrode 17b via an interlayer insulating film, and the coupling capacitor electrode 37av Is connected to the contact electrode 78a, and the contact electrode 78a is connected to the pixel electrode 17a through the contact hole 12a.
- a coupling capacitor C101 (see FIG. 1) between the pixel electrodes 17a and 17b is formed.
- the source electrode 8b of the transistor 12b is connected to the data signal line 15x.
- the drain electrode 9b is connected to the drain lead wiring 27b, the drain lead wiring 27b is connected to the contact electrode 77b, and the contact electrode 77b is connected to the pixel electrode 17b through the contact hole 11b.
- the storage capacitor electrode 38b formed in the same layer as the storage capacitor electrode 38a overlaps the scanning signal line 16d through the gate insulating film and is connected to the lead-out wiring 28b.
- the lead-out wiring 28b is connected to the contact electrode 78b.
- the contact electrode 78b is connected to the pixel electrode 17b through the contact hole 12b.
- the holding capacitor Chb (see FIG. 1) is formed. Note that the configuration of other pixels (the shape, arrangement, and connection relationship of each member) is the same as that of the pixel 101.
- the sub-pixel including the pixel electrode 17a is “bright”, and the sub-pixel including the pixel electrode 17b is “dark”.
- the first feature is that the transistor 12b connected to the capacitive coupling electrode is turned on at least once while the liquid crystal display device is in the on state.
- the capacitive coupling electrode pixel electrode 17b
- the capacitive coupling electrode can be electrically connected to the data signal line 15x, so that the accumulated charge can be discharged (refreshed).
- the occurrence of burn-in of the subpixel including the electrode can be suppressed.
- the transistor 12b is turned on at least once while the liquid crystal display device is on, and the transistor 12b is turned off while Vcom is supplied to the data signal line 15x. is there.
- the potential of the pixel electrode 17b can be set to Vcom, it is possible to prevent the display quality from being deteriorated in addition to the above-described discharge effect.
- the transistor 12b connected to the pixel electrode 17b is turned off. That is, when the transistor 12b is turned off, the transistor 12a is in an on state, and Vcom is supplied to the pixel electrode 17a.
- the potential of the pixel electrode in one pixel region can be reset before writing a normal signal potential to the pixel electrode 17a. That is, the potential of the capacitively coupled pixel electrode 17b can be fixed to Vcom.
- the charges accumulated in the pixel electrode 17b can be reliably discharged, and the display quality can be prevented from deteriorating.
- FIG. 10 is a timing chart showing a driving method of the present liquid crystal display device including the liquid crystal panel 5a.
- Sv and SV indicate signal potentials supplied to two adjacent data signal lines (for example, 15x and 15X), and Ga to Gf are gate-on pulse signals supplied to the scanning signal lines 16a to 16f.
- Vc, Vd, Va, Vb, VC, and VD represent the potentials of the pixel electrodes 17c, 17d, 17a, 17b, 17C, and 17D, respectively, and sh represents a charge share signal. Note that during a period in which the charge share signal is active (“H”), all the data signal lines are short-circuited to each other, or the same potential is supplied to all the data signal lines from the outside, whereby charge sharing is performed.
- H charge share signal
- the polarity of the signal potential supplied to the data signal line is inverted every horizontal scanning period (1H) and supplied during the same horizontal scanning period in each frame.
- the polarity of the signal potential is inverted in units of one frame, and signal potentials having opposite polarities are supplied to two adjacent data signal lines in the same horizontal scanning period, and charge sharing is performed at the beginning of each horizontal scanning period. .
- the upper and lower scanning signal lines corresponding to one pixel are sequentially selected (for example, scanning signal lines 16c and 16d ⁇ scanning signal lines 16a and 16b ⁇ Scanning signal lines 16e and 16f (see FIG. 1)) and one of the two adjacent data signal lines (for example, the data signal line 15x) has a first horizontal scanning period (for example, the pixel electrodes 17c and 17d).
- a positive polarity signal potential is supplied during the second horizontal scanning period (for example, a writing period for the pixel electrodes 17a and 17b), and a negative polarity signal potential is supplied during the third horizontal scanning period (including the writing period).
- a positive signal potential is supplied to the pixel electrodes 17e and 17f), and the other of the two data signal lines (for example, the data signal line 15X) is supplied to the other.
- a negative-polarity signal potential is supplied in the first horizontal scanning period (for example, including the writing period of the pixel electrodes 17C and 17D), and positive in the second horizontal scanning period (for example, including the writing period of the pixel electrodes 17A and 17B).
- a signal potential having a polarity is supplied, and a signal potential having a negative polarity is supplied in a third horizontal scanning period (for example, including a writing period of the pixel electrodes 17E and 17F). Note that at the beginning of each horizontal scanning period, a charge share potential (Vcom) is supplied.
- Vcom charge share potential
- the writing period to each pixel electrode connected to each of the two scanning signal lines corresponding to one pixel is set to be different from each other. Specifically, in FIG. 1, a period during which a positive signal potential is written to the pixel electrode 17c when the scanning signal line 16c is selected, and Vcom is applied to the pixel electrode 17d when the scanning signal line 16d is selected.
- the period in which the signal potential is written is longer than the period in which the signal potential having a negative polarity is written in the pixel electrode 17a by selecting the scanning signal line 16a. It is longer than the period during which the signal potential of Vcom is written to 17b.
- the writing operation to each pixel electrode in one pixel is performed within the same horizontal scanning period, and the timing at which the writing operation (active period) to each pixel electrode ends is shorter when the writing period is shorter. Is set to end before the longer one.
- the writing operation to the pixel electrode 17d ends before the timing at which the writing operation to the pixel electrode 17c ends, and the writing operation to the pixel electrode 17D ends the writing operation to the pixel electrode 17C.
- the write operation to the pixel electrode 17b ends before the timing at which the write operation to the pixel electrode 17a ends.
- the gate on pulse signal (second gate on pulse signal) supplied to the scanning signal line connected to the pixel electrode to be capacitively coupled has its pulse width connected to the pixel electrode to which the normal signal potential is written.
- the second gate on-pulse signal is less than the pulse width of the gate on-pulse signal (first gate on-pulse signal) supplied to the scanning signal line to be turned on before the first gate on-pulse signal becomes inactive.
- the pulse width is set so as to be inactive. Accordingly, the subpixel including the pixel electrode 17c (positive polarity) is “bright”, the subpixel including the pixel electrode 17d (positive polarity) is “dark”, and the subpixel including the pixel electrode 17C (negative polarity) is “bright”.
- the sub-pixel including the pixel electrode 17D (minus polarity) is “dark”, the sub-pixel including the pixel electrode 17a (minus polarity) is “bright”, and the sub-pixel including the pixel electrode 17b (minus polarity) is “dark”.
- the whole is as shown in FIG.
- the subpixel including the pixel electrode 17c (minus polarity) is “bright”
- the subpixel including the pixel electrode 17d (minus polarity) is “dark”
- the subpixel including the pixel electrode 17C (plus polarity) is “bright”.
- the subpixel including the pixel electrode 17D (plus polarity) is “dark”
- the subpixel including the pixel electrode 17a (plus polarity) is “bright”
- the subpixel including the pixel electrode 17b (plus polarity) is “dark”.
- subsequent frames F3 and F4 the operations of F1 and F2 are repeated.
- the pixel electrodes (15x, 15X) connected to the data signal lines (15x, 15X) via the transistors (12c, 12a, 12C, 12A in FIGS. 1 and 2). 17c, 17a, 17C, and 17A) to the pixel electrodes (pixel electrodes 17d, 17b, 17D, and 17B) that are capacitively coupled to the pixel electrodes (17c, 17a, 17C, and 17A) to which normal writing is performed. Since the signal potential can be individually supplied at a timing different from the supply, a pixel division type liquid crystal display device can be realized.
- the pixel electrode potential is reset to Vcom before writing the normal signal potential. can do.
- the charge accumulated in the capacitively coupled pixel electrode can be discharged (refreshed), so that the occurrence of burn-in of the subpixel including the capacitively coupled pixel electrode can be suppressed, and the display quality can be improved. Decline can be prevented.
- the driving method shown in FIG. 10 may be the driving method shown in FIG. That is, the second gate-on pulse signals (Gd, Gb, Gf) are set so that their pulse widths are wider than the charge share period (sh pulse width).
- the signal potential of Vcom is written to the pixel electrodes (17d, 17b, 17f) that are capacitively coupled to the pixel electrodes (17c, 17a, 17e) where normal writing is performed during the charge sharing period.
- a normal signal potential written to the pixel electrodes (17c, 17a, 17e) for a predetermined period is supplied. Thereby, the effect that the brightness
- the pixel connected to the pixel electrode (17c, 17a, 17e) connected to the data signal line via the transistor is adjusted by adjusting the pulse width of the second gate-on pulse signal. Since the luminance of the electrodes (17d, 17b, 17f; capacitive coupling electrodes) can be adjusted independently, the liquid crystal display device can be set to an arbitrary display luminance.
- FIG. 13 is a circuit diagram showing a configuration of a gate driver of the present liquid crystal display device for realizing the driving shown in FIG.
- the gate driver GD includes a shift register 45, a plurality of AND circuits (66a to 66f) arranged in the column direction, and an output circuit 46.
- the shift register 45 receives the gate start pulse signal GSP and the gate clock signal GCK.
- the output of each stage of the shift register 45 is divided into two systems, one of which is input to the odd-numbered AND circuit, and the other is input to the even-numbered AND circuit adjacent thereto.
- the gate driver output control signal GOE is composed of two systems of signals (OEx ⁇ OEy).
- An inverted signal of the signal OEx is input to the odd-numbered AND circuit, and an inverted signal of the signal OEy is input to the even-numbered AND circuit.
- the output of one AND circuit becomes a gate-on pulse signal through the output circuit 46 and is supplied to one scanning signal line.
- the output from a certain stage of the shift register 45 is divided into two systems, one Qc of which is input to the AND circuit 66c, and the other Qd is input to the AND circuit 66d. Further, an inverted signal of the signal OEx is input to the AND circuit 66c, and an inverted signal of the signal OEy is input to the AND circuit 66d.
- the output of the AND circuit 66c passes through the output circuit 46 to become a gate-on pulse signal Gc and is supplied to the scanning signal line 16c. Further, the output of the AND circuit 66d becomes a gate-on pulse signal Gd through the output circuit 46, and is supplied to the scanning signal line 16d.
- the output from the other stage of the shift register 45 is divided into two systems, one of which is input to the AND circuit 66a, and the other Qb is input to the AND circuit 66b. Further, an inverted signal of the signal OEx is input to the AND circuit 66a, and an inverted signal of the signal OEy is input to the AND circuit 66b.
- the output of the AND circuit 66a passes through the output circuit 46 and becomes a gate-on pulse signal Ga, which is supplied to the scanning signal line 16a. Further, the output of the AND circuit 66b becomes a gate-on pulse signal Gb through the output circuit 46, and is supplied to the scanning signal line 16b.
- FIG. 14 is a timing chart showing the operation of the gate driver of FIG.
- the signal OEx is always “L” in each frame, while the signal OEy is “L” at the front end of each horizontal scanning period. Note that the signal OEx does not always have to be “L”. For example, when the fall of the waveform of the gate-on pulse is dull and overlaps with the next horizontal scanning period, “ H ”may be used.
- the gate-on pulse signals Gc, Ga, and Ge can be sequentially set to “H” (active), and at the same time, the gate-on pulse signals Gd, Gb, and Gf can be sequentially set to “H” (active).
- the gate on pulse signals Gc, Ga, and Ge and the gate on pulse signals Gd, Gb, and Gf have different gate on pulse (write pulse) widths (“H” period (active period)). be able to. Thereby, driving as shown in FIG. 10 is realized.
- one gate on pulse signal supplied to each of the two scanning signal lines corresponding to one pixel is provided. It can be generated using the output from the same stage of the shift register, and the effect that the driver configuration can be simplified can be obtained.
- FIG. 15 is a timing chart showing another driving method of the present liquid crystal display device.
- Each symbol shown in this figure is the same as the symbol shown in FIG.
- the polarity of the signal potential supplied to the data signal line is inverted every horizontal scanning period (1H), and at the same horizontal scanning period in each frame.
- the polarity of the supplied signal potential is inverted in units of one frame, and in the same horizontal scanning period, a signal potential of opposite polarity is supplied to two adjacent data signal lines, and charge sharing is performed at the beginning of each horizontal scanning period. Is going.
- the upper and lower scanning signal lines corresponding to one pixel are sequentially selected (for example, scanning signal lines 16c and 16d ⁇ scanning signal lines 16a and 16b ( 1)) and a positive signal potential is supplied to one of the two adjacent data signal lines (for example, the data signal line 15x) during the n-th horizontal scanning period, and at the beginning, Vcom A signal is supplied, a negative-polarity signal potential is supplied during the (n + 1) th horizontal scanning period (for example, including the writing period of the pixel electrode 17c), and at the beginning, a Vcom signal is supplied, and the (n + 2) th In the horizontal scanning period (for example, including the writing period of the pixel electrode 17a), a positive signal potential is supplied, and at the beginning, the Vcom signal Supplies.
- the other of the two data signal lines (for example, the data signal line 15X) is supplied with a negative-polarity signal potential during the nth horizontal scanning period, and at the beginning thereof is supplied with a Vcom signal, and (n + 1) A positive polarity signal potential is supplied in the first horizontal scanning period (for example, including the writing period of the pixel electrode 17C), and at the beginning, the Vcom signal is supplied, and the (n + 2) th horizontal scanning period (for example, the pixel electrode) A negative-polarity signal potential is supplied during the 17A writing period), and the Vcom signal is supplied at the beginning.
- the subpixel including the pixel electrode 17c (minus polarity) is “bright”
- the subpixel including the pixel electrode 17d (minus polarity) is “dark”
- the subpixel including the pixel electrode 17C (plus polarity) is “bright”.
- the sub-pixel including the pixel electrode 17D (plus polarity) is “dark”
- the sub-pixel including the pixel electrode 17a (plus polarity) is “bright”
- the sub-pixel including the pixel electrode 17b (plus polarity) is “dark”.
- the transistors 12a and 12b are both turned on and written in the normal signal potential one horizontal scanning period (n + 1) before the horizontal scanning period (n + 2) in which normal writing is performed.
- Vcom is supplied to the pixel electrode 17a and the pixel electrode 17b that is capacitively coupled to the pixel electrode 17a.
- the transistors 12a and 12b are both turned off during the period in which Vcom is supplied.
- the negative polarity signal potential supplied to the data signal line 15x in the (n + 1) th horizontal scanning period is supplied as a normal write signal to the pixel electrode 17c in the previous stage, while the pixel electrode in the pixel 101 is supplied. 17a is not supplied.
- the transistor 12a is turned on, and Vcom is supplied to the pixel electrode 17a at the beginning, and then a positive polarity signal potential as a normal writing signal is supplied.
- the subpixel including the pixel electrode 17c (minus polarity) is “bright”
- the subpixel including the pixel electrode 17d (minus polarity) is “dark”
- the subpixel is “bright”
- the subpixel including the pixel electrode 17D (plus polarity) is “dark”
- the subpixel including the pixel electrode 17a (plus polarity) is “bright”
- the subpixel including the pixel electrode 17b (plus polarity) Becomes “dark”.
- the subpixel including the pixel electrode 17c positive polarity
- the subpixel including the pixel electrode 17d positive polarity
- the subpixel including the pixel electrode 17C negative polarity
- the subpixel including the pixel electrode 17D minus polarity
- the subpixel including the pixel electrode 17a is “bright”
- the subpixel including the pixel electrode 17b is “dark”.
- Vcom is supplied from the data signal line 15x to the pixel electrodes 17a and 17b when the transistor 12b is turned off. That is, the potential of the pixel electrodes 17a and 17b can be fixed (reset) to Vcom at the time when the normal signal potential is written to the pixel electrode 17a. As a result, the charge accumulated in the capacitive coupling electrode (pixel electrode 17b) can be reliably discharged, and the display quality can be prevented from deteriorating.
- the reset operation is performed before one horizontal scanning period (1H) of the horizontal scanning period in which normal writing is performed.
- the timing of performing the reset operation is particularly limited. It may be before 2H or before that.
- the number of reset operations is not limited to one, and may be a plurality of times.
- the driving method shown in FIG. 15 may be the driving method shown in FIG. That is, in the horizontal scanning period in which regular writing is performed, the second gate on-pulse signals (Gd, Gb, Gf) are set to be at a high level (H level) only for a predetermined period. Specifically, in FIG. 16, the second gate-on pulse signal rises in synchronization with the timing at which the charge share signal (sh) becomes low level (L level), and maintains the high level state for a predetermined period.
- the first gate on pulse signal (Gc, Ga, Ge) falls before falling.
- the pixel electrodes (17d, 17b, and 17f) that are capacitively coupled to the pixel electrodes (17c, 17a, and 17e) to which normal writing is performed are applied in the horizontal scanning period in which normal writing is performed.
- a normal signal potential written to the pixel electrodes (17c, 17a, 17e) is supplied for a predetermined period.
- the high-level period of the second gate-on pulse signal is adjusted, so that the second electrode is connected to the pixel electrodes (17c, 17a, 17e) connected to the data signal line through the transistor.
- the liquid crystal display device can be set to an arbitrary display luminance.
- the high level period of the second gate on-pulse signal is not limited to the example shown in FIG. 16, and is a regular signal for the pixel electrodes (17c, 17a, 17e) at least in the low level period of the charge share signal. It is only necessary to set the potential to be shorter than the period during which the potential is written.
- FIG. 17 is a circuit diagram showing a configuration of a gate driver of the present liquid crystal display device for realizing the driving shown in FIG.
- the gate driver GD includes a shift register 45, a plurality of AND circuits (66a to 66f) arranged in the column direction, and an output circuit 46.
- the shift register 45 receives the gate start pulse signal GSP and the gate clock signal GCK.
- the output of each stage of the shift register 45 is divided into two systems, one of which is input to the odd-numbered AND circuit, and the other is input to the even-numbered AND circuit adjacent thereto.
- the gate driver output control signal GOE is composed of four signals (OEx1, OEx2, OEy1, and OEy2).
- Inverted signals of the signals OEx1 and OEx2 are sequentially input to odd-numbered AND circuits, and even-numbered AND circuits. Inverted signals of the signals OEy1 and OEy2 are alternately input. The output of one AND circuit becomes a gate-on pulse signal through the output circuit 46 and is supplied to one scanning signal line.
- the output from a certain stage of the shift register 45 is divided into two systems, one Qc of which is input to the AND circuit 66c, and the other Qd is input to the AND circuit 66d. Further, an inverted signal of the signal OEx1 is input to the AND circuit 66c, and an inverted signal of the signal OEy1 is input to the AND circuit 66d.
- the output of the AND circuit 66c passes through the output circuit 46 to become a gate-on pulse signal Gc and is supplied to the scanning signal line 16c. Further, the output of the AND circuit 66d becomes a gate-on pulse signal Gd through the output circuit 46, and is supplied to the scanning signal line 16d.
- the output from the other stage of the shift register 45 is divided into two systems, one of which is input to the AND circuit 66a, and the other Qb is input to the AND circuit 66b. Further, an inverted signal of the signal OEx2 is input to the AND circuit 66a, and an inverted signal of the signal OEy2 is input to the AND circuit 66b.
- the output of the AND circuit 66a passes through the output circuit 46 and becomes a gate-on pulse signal Ga, which is supplied to the scanning signal line 16a. Further, the output of the AND circuit 66b becomes a gate-on pulse signal Gb through the output circuit 46, and is supplied to the scanning signal line 16b.
- FIG. 18 is a timing chart showing the operation of the gate driver of FIG.
- the signals OEx1 and OEx2 are configured in units of two horizontal scanning periods (2H), and become “L” in 1H of 2H, while the front end portion is in other 1H. “L” and the remaining portion become “H” (active).
- the signals OEx1 and OEx2 are shifted from each other by 1H.
- the signals OEy1 and OEy2 are each configured in units of two horizontal scanning periods (2H). In 1H of 2H, the front end portion is “L” and the remaining portion is “H” (active), while the other 1H Then, it becomes “H”.
- the signals OEy1 and OEy2 are shifted from each other by 1H.
- As the output Q of the shift register 45 a signal which becomes “H” for two horizontal scanning periods is sequentially output from each stage. As a result, driving as shown in FIG. 15 is realized.
- FIG. 19 is a timing chart showing another driving method of the present liquid crystal display device.
- the driving method-2 after Vcom is supplied to the pixel electrodes 17a and 17b one horizontal scanning period before normal writing, both the transistors 12a and 12b are turned off until normal writing to the pixel electrode 17a is performed. It is in a state.
- this driving method after supplying Vcom to the pixel electrodes 17a and 17b before one horizontal scanning period of normal writing, only the transistor 12b is turned off, and the transistor 12a remains turned on. A signal potential is supplied to the electrode 17a.
- description of the contents overlapping with those of the driving method -2 will be omitted, and a specific description will be given by taking the pixel 101 as an example, focusing on the differences.
- the transistors 12a and 12b are both turned on one pixel before the horizontal scanning period (n + 2) in which normal writing is performed (n + 1), and the pixel electrode 17a to which the normal signal potential is written. Then, Vcom is supplied to the pixel electrode 17b that is capacitively coupled to the pixel electrode 17a. Then, only the transistor 12b is turned off during the period in which Vcom is supplied.
- the negative polarity signal potential supplied to the data signal line 15x in the (n + 1) th horizontal scanning period is supplied as a normal write signal to the previous pixel electrode 17c, while the pixel electrode in the pixel 101 is supplied. The same signal potential is also supplied to 17a.
- the data signal (signal potential) for the pixel electrode 17c in the previous stage is written to the pixel electrode 17a 1H before normal writing. Since the transistor 12a remains on, in the next (n + 2) th horizontal scanning period, after Vcom is supplied to the pixel electrode 17a at the beginning, a positive polarity signal potential is supplied as a normal writing signal. Is done.
- Vcom is supplied from the data signal line 15x to the pixel electrodes 17a and 17b when the transistor 12b is turned off, as in the driving method-2. That is, the potential of the pixel electrodes 17a and 17b can be fixed (reset) to Vcom at the time when the normal signal potential is written to the pixel electrode 17a. Therefore, even if the signal potential that is not a regular signal potential is supplied to the pixel electrode 17a after the potentials of the pixel electrodes 17a and 17b once become Vcom, the sum of the respective capacitances in the pixel electrodes 17a and 17b does not change. . As a result, the charge accumulated in the capacitive coupling electrode (pixel electrode 17b) can be reliably discharged, and the display quality can be prevented from deteriorating.
- FIG. 20 is a circuit diagram showing a configuration of a gate driver of the present liquid crystal display device for realizing the driving shown in FIG.
- the gate driver GD includes a shift register 45, a plurality of AND circuits (66a to 66f) arranged in the column direction, and an output circuit 46.
- the shift register 45 receives the gate start pulse signal GSP and the gate clock signal GCK.
- the output of each stage of the shift register 45 is divided into two systems, one of which is input to the odd-numbered AND circuit, and the other is input to the even-numbered AND circuit adjacent thereto.
- the gate driver output control signal GOE is composed of three systems of signals (OEx, OEy1, and OEy2).
- An inverted signal of the signal OEx is input to the odd-numbered AND circuit, and the signals OEy1 and OEy2 are sequentially input to the even-numbered AND circuit. Inverted signals are alternately input.
- the output of one AND circuit becomes a gate-on pulse signal through the output circuit 46 and is supplied to one scanning signal line.
- the output from a certain stage of the shift register 45 is divided into two systems, one Qc of which is input to the AND circuit 66c, and the other Qd is input to the AND circuit 66d. Further, an inverted signal of the signal OEx is input to the AND circuit 66c, and an inverted signal of the signal OEy1 is input to the AND circuit 66d.
- the output of the AND circuit 66c passes through the output circuit 46 to become a gate-on pulse signal Gc and is supplied to the scanning signal line 16c. Further, the output of the AND circuit 66d becomes a gate-on pulse signal Gd through the output circuit 46, and is supplied to the scanning signal line 16d.
- the output from the other stage of the shift register 45 is divided into two systems, one of which is input to the AND circuit 66a, and the other Qb is input to the AND circuit 66b. Further, an inverted signal of the signal OEx is input to the AND circuit 66a, and an inverted signal of the signal OEy2 is input to the AND circuit 66b.
- the output of the AND circuit 66a passes through the output circuit 46 and becomes a gate-on pulse signal Ga, which is supplied to the scanning signal line 16a. Further, the output of the AND circuit 66b becomes a gate-on pulse signal Gb through the output circuit 46, and is supplied to the scanning signal line 16b.
- FIG. 21 is a timing chart showing the operation of the gate driver of FIG.
- the signal OEx is always “L” in each frame.
- the signal OEx does not always have to be “L”.
- L may be used.
- the signals OEy1 and OEy2 are each configured in units of two horizontal scanning periods (2H). In 1H of 2H, the front end portion is “L” and the remaining portion is “H” (active), while the other 1H Then, it becomes “H” (active).
- the signals OEy1 and OEy2 are shifted from each other by 1H.
- As the output Q of the shift register 45 a signal which becomes “H” for two horizontal scanning periods is sequentially output from each stage. As a result, driving as shown in FIG. 19 is realized.
- FIG. 22 is a timing chart showing another driving method of the present liquid crystal display device.
- Each symbol shown in this figure is the same as the symbol shown in FIG.
- the polarity of the signal potential supplied to the data signal line is inverted every horizontal scanning period (1H), and at the same horizontal scanning period in each frame.
- the polarity of the supplied signal potential is inverted in units of one frame, and in the same horizontal scanning period, a signal potential of opposite polarity is supplied to two adjacent data signal lines, and charge sharing is performed at the beginning of each horizontal scanning period. Is going.
- a normal signal potential is written to the pixel electrodes (pixel electrodes 17a, 17c, 17e, 17A, 17C, and 17E in FIG. 1) for a predetermined period (for example, one vertical scan).
- a predetermined period for example, one vertical scan.
- the pixel electrodes (17a, 17c, 17e, 17A, 17C, and 17E), and capacitive coupling electrodes A signal potential (Vcom) for charge discharge (refresh) is supplied to the pixel electrodes 17b, 17d, 17f, 17B, 17D, and 17F in FIG.
- one of the upper and lower scanning signal lines corresponding to one pixel is sequentially selected (for example, scanning signal line 16c ⁇ scanning signal line 16a ⁇ scanning signal line). 16e (see FIG. 1)), and one of the two adjacent data signal lines (for example, the data signal line 15x) is included in the first horizontal scanning period (for example, including the writing period of the pixel electrodes 17c and 17d).
- a positive-polarity signal potential is supplied, a negative-polarity signal potential is supplied during the second horizontal scanning period (for example, including the writing period of the pixel electrodes 17a and 17b), and a third horizontal scanning period (for example, the pixel electrode 17e).
- a positive signal potential is supplied.
- the other of the two data signal lines (for example, the data signal line 15X) is supplied with a negative polarity signal potential in the first horizontal scanning period (for example, including the writing period of the pixel electrodes 17C and 17D).
- a signal potential having a positive polarity is supplied in the third horizontal scanning period (for example, including the writing period of the pixel electrodes 17A and 17B), and a negative polarity is supplied in the third horizontal scanning period (for example, including the writing period of the pixel electrodes 17E and 17F).
- the signal potential is supplied. Note that at the beginning of each horizontal scanning period, a charge share potential (Vcom) is supplied.
- the upper and lower scanning signal lines corresponding to one pixel are sequentially selected (for example, scanning signal lines 16c and 16d ⁇ scanning signal lines 16a and 16b ⁇ scanning).
- Signal lines 16e and 16f (see FIG. 1)), and Vcom is supplied to corresponding data signal lines (for example, data signal lines 15x and 15X).
- the data signal line 15 x connected to the source terminal of the transistor 12 a while the transistor 12 a is turned on by the pixel data write pulse Pw included in the gate-on pulse signal Ga.
- the potential is supplied to the pixel electrode 17a through the transistor 12a.
- the data signal Sv as the voltage of the data signal line 15x is written to the pixel electrode 17a.
- the black voltage application pulse Pb is supplied to the gate terminals of the transistor 12a and the transistor 12b, respectively, so that the pixel electrode 17a is connected to the transistor 12a while the transistors 12a and 12b are on.
- the pixel electrode 17b is connected to the data signal line 15x via the transistor 12b. As a result, the accumulated charge in the pixel capacitance of the pixel electrode 17b is discharged, and the pixel capacitance of the pixel electrodes 17a and 17b is applied with a black voltage (Vcom).
- Vcom black voltage
- the pixel 101 during the image display period Tdp, the voltage corresponding to the potential of the data signal line 15x supplied to the pixel electrode 17a via the transistor 12a is held in the pixel capacitor, so that the pixel 101 is based on the digital image signal. Display pixels are formed.
- the black voltage application pulse Pb appears in the gate-on pulse signals Ga and Gb respectively applied to the gate terminals of the transistors 12a and 12b, until the next pixel data write pulse Pw appears in the gate-on pulse signal Ga.
- Tbk In the period (remaining period excluding the image display period Tdp from one frame (1V) period) Tbk, a black pixel is formed by holding the black voltage (Vcom) in the pixel capacitance.
- the pulse width of the black voltage application pulse Pb is short, at least two, preferably 3 at intervals of one horizontal scanning period (1H) in each frame period in order to ensure that the holding voltage in the pixel capacitor is a black voltage.
- One or more black voltage application pulses Pb are continuously applied to the scanning signal line. In FIG. 22, three black voltage application pulses Pb appear continuously at intervals of one horizontal scanning period (1H) in one frame period (1V).
- a black display period is inserted for each display line, so that the display is impulsed while suppressing the complexity of the driving circuit and the increase of the operating frequency.
- Each of the driving methods described above employs the charge sharing method.
- the present invention is not limited to this, and other methods include, for example, a period in which all transistors are turned on in one frame period.
- a configuration may be adopted in which Vcom is supplied to all the data signal lines during the period.
- the present invention is not limited to this.
- the farther from the transistor of the two pixel electrodes provided in one pixel may be connected to the transistor.
- the data signal line 15x is provided along the pixel 100 and the pixel 101
- the data signal line 15X is provided along the pixel 103 and the pixel 104, similarly to the liquid crystal panel in FIG. Yes.
- the scanning signal line 16c is disposed so as to overlap with one of the two edge portions along the row direction of the pixel 100, and the scanning signal line 16d is disposed so as to overlap with the other.
- Pixel electrodes 17d and 17c are arranged in the column direction between 16c and 16d.
- the scanning signal line 16c overlaps one of the two edge portions along the row direction of the pixel 103, and the scanning signal line 16d overlaps the other, and the pixel between the scanning signal lines 16c and 16d is seen in plan view.
- Electrodes 17D and 17C are arranged in the column direction.
- the scanning signal line 16a is formed so as to overlap with one of the two edge portions along the row direction of the pixel 101, and the scanning signal line 16b is formed so as to overlap with the other, and the scanning signal line 16a is viewed in plan view.
- pixel electrodes 17b and 17a are arranged in the column direction.
- the scanning signal line 16a overlaps one of the two edge portions along the row direction of the pixel 104, and the scanning signal line 16b overlaps the other, and the pixel between the scanning signal lines 16a and 16b is seen in plan view.
- Electrodes 17B and 17A are arranged in the column direction.
- the source electrode 8a and the drain electrode 9a of the transistor 12a are formed on the scanning signal line 16a, and the source electrode 8b and the drain electrode 9b of the transistor 12b are formed on the scanning signal line 16b.
- the source electrode 8a is connected to the data signal line 15x.
- the drain electrode 9a is connected to the drain lead wiring 27a, the drain lead wiring 27a is connected to the capacitive coupling electrodes 37av and 37ah and the contact electrode 77a, and the contact electrode 77a is connected to the pixel electrode 17a through the contact hole 11a.
- the coupling capacitor electrodes 37av and 37ah overlap with the pixel electrode 17b through the interlayer insulating film, thereby forming a coupling capacitor C101 (see FIG.
- the coupling capacitance electrodes 37av and 37ah are arranged so as to overlap with the cross-shaped dark lines appearing at the boundary portions of the liquid crystal domains divided into regions, as in the liquid crystal panel 5a of FIG.
- the drain electrode 9a is connected to the drain lead wire 28a, the drain lead wire 28a is connected to the storage capacitor electrode 38a formed in the same layer as the coupling capacitor electrode 37a, and the storage capacitor electrode 38a is connected to the scanning signal line through the gate insulating film.
- a storage capacitor Cha (see FIG. 1) is formed.
- the source electrode 8b of the transistor 12b is connected to the data signal line 15x.
- the drain electrode 9b is connected to the drain lead wiring 27b, the drain lead wiring 27b is connected to the contact electrode 77b, and the contact electrode 77b is connected to the pixel electrode 17b through the contact hole 11b.
- the storage capacitor electrode 38b formed in the same layer as the storage capacitor electrode 38a overlaps the scanning signal line 16d through the gate insulating film and is connected to the lead-out wiring 28b.
- the lead-out wiring 28b is connected to the contact electrode 78b.
- the contact electrode 78b is connected to the pixel electrode 17b through the contact hole 12b.
- the holding capacitor Chb (see FIG. 1) is formed. Note that the configuration of other pixels (the shape, arrangement, and connection relationship of each member) is the same as that of the pixel 101.
- the sub-pixel including the pixel electrode 17a is “bright”, and the sub-pixel including the pixel electrode 17b is “dark”.
- liquid crystal panel 1 (Specific example of liquid crystal panel 1-5) Further, the liquid crystal panel of FIG. 1 may be configured as shown in FIG. In the liquid crystal panel 5a of FIG. 25, one of the two pixels adjacent in the row direction is connected to the pixel electrode closer to the transistor and the other is connected to the transistor electrode electrode farther from the transistor. Yes.
- FIG. 26 shows a specific example of the liquid crystal panel 5a of FIG.
- liquid crystal panel of FIG. 26 bright subpixels are not aligned in the row direction, and dark subpixels are not aligned in the row direction, so that unevenness in the row direction can be reduced.
- the liquid crystal panel of FIG. 26 may be configured as shown in FIG.
- the liquid crystal panel of FIG. 28 as in the liquid crystal panel of FIG. 26, one of the two pixels adjacent in the row direction is connected to the pixel electrode closer to the transistor and the other is connected to the pixel electrode farther from the transistor. Is connected to the transistor.
- a scanning signal line 16c is arranged at the center in the column direction of the pixels 100 and 103 so as to cross the pixels 100 and 103, respectively. Are provided with scanning signal lines 16a across the pixels 101 and 104, respectively.
- the pixel electrodes 17c and 17d are arranged in the column direction across the scanning signal line 16c, and in the pixel 101, the pixel electrodes 17a and 17b are arranged in the column direction across the scanning signal line 16a.
- the pixel electrodes 17C and 17D are arranged in the column direction across the scanning signal line 16c.
- the pixel electrodes 17A and 17B are arranged in the column direction across the scanning signal line 16a.
- the source electrode 8a and the drain electrode 9a of the transistor 12a are formed on the scanning signal line 16a, and the source electrode 8b and the drain electrode 9b of the transistor 12b are formed on the scanning signal line 16b.
- the source electrode 8a is connected to the data signal line 15x.
- the drain electrode 9a is connected to the drain lead wiring 27a, the drain lead wiring 27a is connected to the contact electrode 77a, and the contact electrode 77a is connected to the pixel electrode 17a through the contact hole 11a.
- the drain electrode 9a is connected to the drain lead wiring 28a
- the drain lead wiring 28a is connected to the coupling capacitor electrodes 37av and 37ah
- the coupling capacitor electrodes 37av and 37ah overlap the pixel electrode 17b through the interlayer insulating film.
- a coupling capacitor C101 (see FIG. 25) between the pixel electrodes 17a and 17b is formed.
- the storage capacitor electrode 38a overlaps the scanning signal line 16d through the gate insulating film and is connected to the lead-out wiring 28a.
- the lead-out wiring 28a is connected to the contact electrode 78a.
- the contact electrode 78a is connected to the pixel through the contact hole 12a. Connected to the electrode 17a. Thereby, the holding capacitor Cha (see FIG. 25) is formed.
- the source electrode 8b of the transistor 12b is connected to the data signal line 15x.
- the drain electrode 9b is connected to the drain lead wiring 27b, the drain lead wiring 27b is connected to the contact electrode 77b, and the contact electrode 77b is connected to the pixel electrode 17b through the contact hole 11b.
- the storage capacitor electrode 38b formed in the same layer as the storage capacitor electrode 38a overlaps the scanning signal line 16d through the gate insulating film and is connected to the coupling capacitor electrodes 37bv and 37bh.
- the coupling capacitance electrodes 37bv and 37bh are connected to the lead wiring 28b, the lead wiring 28b is connected to the contact electrode 78b, and the contact electrode 78b is connected to the pixel electrode 17b through the contact hole 12b.
- a coupling capacitor C101 (see FIG. 25) and a holding capacitor Chb (see FIG. 25) are formed.
- the coupling capacitance electrodes 37av and 37ah and the coupling capacitance electrodes 37bv and 37bh are arranged so as to overlap with the cross-shaped dark lines appearing at the boundary portions of the liquid crystal domains divided into regions as in the liquid crystal panel 5a of FIG.
- the bright subpixels are not aligned in the row direction and the dark subpixels are not aligned in the row direction. Can be reduced.
- FIG. 29 is a timing chart showing a driving method of the present liquid crystal display device (normally black mode liquid crystal display device) including the liquid crystal panel shown in FIG. SV and sv indicate signal potentials supplied to two adjacent data signal lines (for example, 15x and 15X), and Ga to Gf are gate-on pulse signals supplied to the scanning signal lines 16a to 16f.
- Vc, Vd, Va, Vb, VC, and VD represent the potentials of the pixel electrodes 17c, 17d, 17a, 17b, 17C, and 17D, respectively
- sh represents a charge share signal. Note that, during a period in which the charge share signal is active (“H”), charge sharing is performed when all the data signal lines are short-circuited with each other or the same potential is supplied to all the data signal lines from the outside.
- Vcom is supplied to two pixel electrodes (for example, first and second pixel electrodes) provided in one pixel.
- the transistor connected to the second pixel electrode is turned off, and then a signal potential is written to the first pixel electrode.
- the transistor connected to the first pixel electrode is turned off while Vcom is supplied to the first and second pixel electrodes, and then the signal potential is written to the second pixel electrode.
- the scanning signal line 16b is turned ON / OFF during the charge sharing period at the beginning of the horizontal scanning period of the scanning signal line 16a.
- the scanning signal is output during the charge sharing period at the beginning of the horizontal scanning period of the scanning signal line 16a. Turn the line 16a ON / OFF.
- subsequent frames F3 and F4 the operations of F1 and F2 are repeated.
- the polarity of the signal potential supplied to the data signal line is inverted every horizontal scanning period (1H), and the polarity of the signal potential supplied during the same horizontal scanning period in each frame is changed. Inversion is performed in units of two frames, and signal potentials having opposite polarities are supplied to two adjacent data signal lines in the same horizontal scanning period, and charge sharing is performed at the beginning of each horizontal scanning period.
- a positive signal potential is supplied to one of the two adjacent data signal lines (for example, the data signal line 15x) in the first horizontal scanning period (for example, including the writing period of the pixel electrode 17c).
- a negative-polarity signal potential is supplied in the second horizontal scanning period (for example, including the writing period of the pixel electrode 17a), and a positive-polarity signal is supplied in the third horizontal scanning period (for example, including the writing period of the pixel electrode 17e).
- a potential is supplied, and a negative polarity signal potential is supplied to the other of the two data signal lines (for example, the data signal line 15X) in the first horizontal scanning period (for example, including the writing period of the pixel electrode 17D).
- a positive polarity signal potential is supplied in the second horizontal scanning period (for example, including the writing period of the pixel electrode 17B), and the third horizontal scanning period (for example, the pixel electrode 1) is supplied.
- Supplying a signal electric potential of a positive polarity is F including the writing period). Accordingly, the subpixel including the pixel electrode 17c (positive polarity) is “bright”, the subpixel including the pixel electrode 17d (positive polarity) is “dark”, and the subpixel including the pixel electrode 17C (negative polarity) is “dark”.
- the sub-pixel including the pixel electrode 17D (minus polarity) is “bright”, the sub-pixel including the pixel electrode 17a (minus polarity) is “bright”, and the sub-pixel including the pixel electrode 17b (minus polarity) is “dark”. As a whole, it becomes as shown in FIG.
- the upper and lower scanning signal lines corresponding to one pixel are selected, and one pixel electrode (pixel electrode 17c, 17D, 17a, etc.) is supplied with Vcom supplied to two adjacent data signal lines.
- the transistors (transistors 12c, 12C, 12a, 12A) connected to 17B) are turned OFF, and then the signal potential is written to the other pixel electrodes (pixel electrodes 17d, 17C, 17b, 17A).
- a positive signal potential is supplied to one of the two adjacent data signal lines (data signal line 15x) in the first horizontal scanning period (for example, including the writing period of the pixel electrode 17d).
- a negative polarity signal potential is supplied in the third horizontal scanning period (for example, including the writing period of the pixel electrode 17b), and a positive polarity signal potential is supplied in the third horizontal scanning period (for example, including the writing period of the pixel electrode 17f).
- the other of the two data signal lines (for example, the data signal line 15X) is supplied with a negative polarity signal potential in the first horizontal scanning period (for example, including the writing period of the pixel electrode 17C),
- a positive-polarity signal potential is supplied in the second horizontal scanning period (for example, including the writing period of the pixel electrode 17A), and the third horizontal scanning period (for example, writing of the pixel electrode 17E is performed). Supplying a signal electric potential of a positive polarity to the write including periods).
- the subpixel including the pixel electrode 17c positive polarity
- the subpixel including the pixel electrode 17d positive polarity
- the subpixel including the pixel electrode 17C negative polarity
- the sub-pixel including the pixel electrode 17D minus polarity
- the sub-pixel including the pixel electrode 17a is “dark”
- the sub-pixel including the pixel electrode 17b is “bright”. The whole is as shown in FIG.
- one pixel electrode for example, the pixel electrodes 17d, 17C, and so on
- the transistors for example, transistors 12d, 12D, 12b, and 12B
- the signal potential is written to the other pixel electrode (for example, the pixel electrodes 17c, 17D, 17a, and 17B).
- a negative polarity signal potential is supplied to one of the two adjacent data signal lines (for example, the data signal line 15x) in the first horizontal scanning period (for example, including the writing period of the pixel electrode 17c).
- a positive polarity signal potential is supplied in the second horizontal scanning period (for example, including the writing period of the pixel electrode 17a), and a negative polarity signal is supplied in the third horizontal scanning period (for example, including the writing period of the pixel electrode 17e).
- a potential is supplied, and a positive polarity signal potential is supplied to the other of the two data signal lines (for example, the data signal line 15X) in the first horizontal scanning period (for example, including the writing period of the pixel electrode 17D).
- a negative-polarity signal potential is supplied in the second horizontal scanning period (for example, including the writing period of the pixel electrode 17B), and the third horizontal scanning period (for example, the pixel electrode) Supplying a signal electric potential of a negative polarity including a write-in period of the 7F).
- the subpixel including the pixel electrode 17c negative polarity
- the subpixel including the pixel electrode 17d negative polarity
- the subpixel including the pixel electrode 17C positive polarity
- the subpixel including the pixel electrode 17D (positive polarity) is “bright”, the subpixel including the pixel electrode 17a (plus polarity) is “bright”, and the subpixel including the pixel electrode 17b (plus polarity) is “dark”. The whole is as shown in FIG.
- F4 first, two upper and lower scanning signal lines corresponding to one pixel are selected, and one pixel electrode (pixel electrodes 17c, 17D, 17a, and so on) is supplied with Vcom supplied to two adjacent data signal lines.
- the transistors (transistors 12c, 12C, 12a, 12A) connected to 17B) are turned OFF, and then the signal potential is written to the other pixel electrodes (pixel electrodes 17d, 17C, 17b, 17A).
- a negative polarity signal potential is supplied to one of the adjacent two data signal lines (for example, the data signal line 15x) in the first horizontal scanning period (for example, including the writing period of the pixel electrode 17d).
- a positive polarity signal potential is supplied in the second horizontal scanning period (for example, including the writing period of the pixel electrode 17b), and a negative polarity signal is supplied in the third horizontal scanning period (for example, including the writing period of the pixel electrode 17f).
- a potential is supplied, and a positive polarity signal potential is supplied to the other of the two data signal lines (for example, the data signal line 15X) in the first horizontal scanning period (for example, including the writing period of the pixel electrode 17C).
- a negative-polarity signal potential is supplied in the second horizontal scanning period (for example, including the writing period of the pixel electrode 17A), and the third horizontal scanning period (for example, the pixel electrode) Supplying a signal electric potential of a negative polarity including a write-in period of the 7E).
- the sub-pixel including the pixel electrode 17c negative polarity
- the sub-pixel including the pixel electrode 17d negative polarity
- the sub-pixel including the pixel electrode 17C positive polarity
- the subpixel including the pixel electrode 17D (positive polarity) is “dark”
- the subpixel including the pixel electrode 17a (positive polarity) is “dark”
- the subpixel including the pixel electrode 17b (positive polarity) is “light”. The whole is as shown in FIG.
- the transistor 12b connected to the pixel electrode 17b can be turned off while the common electrode potential is supplied to the pixel electrodes 17a and 17b during the charge sharing period, and at this time, the pixel electrode 17b is discharged. be able to. That is, in one horizontal scanning period, the pixel electrode 17b can be discharged first, and then the signal potential can be written to the pixel electrode 17a.
- the potential of the pixel electrode 17b (that is, the luminance of the dark subpixel) after the scanning signal line 16a is turned off is set to a desired value that is not affected by the signal potential written to the pixel electrode 17b one frame before. it can.
- the bright subpixels and the dark subpixels are arranged in a checkered pattern in each frame, and the bright subpixels and the dark subpixels can be exchanged in units of one frame. Improvements can be made.
- the scanning signal line selected when writing the signal potential out of the two scanning signal lines is switched for each frame (for example, in the frames F1 and F3, the scanning signal line 16a and the frame F2 are switched).
- F4 together with the scanning signal line 16b), the polarity of the signal potential corresponding to the same pixel is inverted every two frames (for example, positive polarity in frames F1 and F2 and negative polarity in frames F3 and F4).
- the present invention is not limited to this.
- the scanning signal line selected when writing the signal potential is switched every two frames (for example, the scanning signal line 16a is selected in the frames F1 and F2).
- the scanning signal line 16b is selected in the frames F3 and F4), and the polarity of the signal potential corresponding to the same pixel is inverted every frame.
- a positive polarity in the frame F1 ⁇ F3 may be the frame F2 ⁇ a negative polarity in F4) is.
- the overlapping area of the storage capacitor electrode 38a and the scanning signal line 16d is equal to the overlapping area of the storage capacitor electrode 38b and the scanning signal line 16d.
- the driving method shown in FIG. 29 it is possible to suppress the variation in the storage capacitor formed in each pixel electrode in each frame. For example, it is possible to match (equalize) the holding capacity of the pixel electrode 17a, which is a bright subpixel in the frame F1, with the holding capacity of the pixel electrode 17b, which is a bright subpixel, in the frame F2.
- FIG. 31 is an equivalent circuit diagram showing a part of the present liquid crystal panel according to the second embodiment.
- the liquid crystal panel 5b includes data signal lines (15x and 15X) extending in the column direction (vertical direction in the figure) and scanning signal lines (16a to 16f) extending in the row direction (horizontal direction in the figure). ), Pixels (100 to 105) arranged in the row and column directions, and a common electrode (counter electrode) com, and the structure of each pixel is the same. Note that a pixel column including the pixels 100 to 102 and a pixel column including the pixels 103 to 105 are adjacent to each other.
- one data signal line and two scanning signal lines are provided corresponding to one pixel, and the three pixel electrodes 17c, 17d, and 17c ′ provided in the pixel 100, the pixel
- the three pixel electrodes 17 a, 17 b, 17 a ′ provided in 101 and the three pixel electrodes 17 e, 17 f, 17 e ′ provided in the pixel 102 are arranged in a line, and three pixels provided in the pixel 103
- the electrodes 17C, 17D, and 17C ′, the three pixel electrodes 17A, 17B, and 17A ′ provided in the pixel 104, and the three pixel electrodes 17E, 17F, and 17E ′ provided in the pixel 105 are arranged in a row, and the pixel electrode 17c and 17C, pixel electrodes 17d and 17D, pixel electrodes 17c 'and 17C', pixel electrodes 17a and 17A, pixel electrodes 17b and 17B, and pixel electrodes 17a
- each pixel Since the structure of each pixel is the same, the following description will be given mainly using the pixel 101 as an example.
- the pixel electrodes 17a and 17b are connected via the coupling capacitor C101, the pixel electrode 17a is connected to the data signal line 15x via the transistor 12a connected to the scanning signal line 16a, and the pixel electrode 17b is Connected to the data signal line 15x via the transistor 12b connected to the scanning signal line 16b, a storage capacitor Cha is formed between the pixel electrode 17a and the scanning signal line 16d, and a storage capacitor is connected between the pixel electrode 17b and the scanning signal line 16d.
- Chb is formed, a liquid crystal capacitor Cla is formed between the pixel electrode 17a and the common electrode com, and a liquid crystal capacitor Clb is formed between the pixel electrode 17b and the common electrode com.
- the pixel electrode 17a ′ is electrically connected to the pixel electrode 17a.
- FIG. 2-1 A specific example 2-1 of the liquid crystal panel 5b is shown in FIG.
- the data signal line 15x is provided along the pixel 100 and the pixel 101
- the data signal line 15X is provided along the pixel 103 and the pixel 104.
- the scanning signal line 16c is disposed so as to overlap with one of the two edge portions along the row direction of the pixel 100, and the scanning signal line 16d is disposed so as to overlap with the other.
- Pixel electrodes 17c, 17d, and 17c ′ are arranged in the column direction between 16c and 16d.
- the scanning signal line 16c overlaps one of the two edge portions along the row direction of the pixel 103, and the scanning signal line 16d overlaps the other, and the pixel between the scanning signal lines 16c and 16d is seen in plan view.
- Electrodes 17C, 17D, and 17C ′ are arranged in the column direction.
- the scanning signal line 16a is formed so as to overlap with one of the two edge portions along the row direction of the pixel 101, and the scanning signal line 16b is formed so as to overlap with the other.
- the scanning signal line 16a overlaps one of the two edge portions along the row direction of the pixel 104, and the scanning signal line 16b overlaps the other, and the pixel between the scanning signal lines 16a and 16b in a plan view.
- the source electrode 8a and the drain electrode 9a of the transistor 12a are formed on the scanning signal line 16a, and the source electrode 8b and the drain electrode 9b of the transistor 12b are formed on the scanning signal line 16b.
- the source electrode 8a is connected to the data signal line 15x.
- the drain electrode 9a is connected to the drain lead wiring 27a, the drain lead wiring 27a is connected to the contact electrode 77a and the coupling capacitance electrode 37a, and the contact electrode 77a is connected to the pixel electrode 17a through the contact hole 11a.
- the coupling capacitor electrode 37a overlaps the pixel electrode 17b with an interlayer insulating film interposed therebetween, whereby a coupling capacitor C101 (see FIG.
- the lead wiring 27a 'drawn from the coupling capacitor electrode 37a is connected to the contact electrode 77a', and the contact electrode 77a 'is connected to the pixel electrode 17a' through the contact hole 11a ', thereby the pixel electrodes 17a and 17a. 'Are electrically connected to each other.
- the drain electrode 9a is connected to the drain lead wire 28a, the drain lead wire 28a is connected to the storage capacitor electrode 38a formed in the same layer as the coupling capacitor electrode 37a, and the storage capacitor electrode 38a is scanned through the gate insulating film.
- the storage capacitor Cha (see FIG. 31) is formed by overlapping the signal line 16d.
- the source electrode 8b of the transistor 12b is connected to the data signal line 15x.
- the drain electrode 9b is connected to the drain lead wiring 27b
- the drain lead wiring 27b is connected to the contact electrode 77b
- the contact electrode 77b is connected to the pixel electrode 17b through the contact hole 11b.
- the storage capacitor electrode 38b formed in the same layer as the storage capacitor electrode 38a overlaps the scanning signal line 16d through the gate insulating film and is connected to the lead-out wiring 28b.
- the lead-out wiring 28b is connected to the contact electrode 78b.
- the contact electrode 78b is connected to the pixel electrode 17b through the contact hole 12b.
- the holding capacitor Chb (see FIG. 31) is formed. Note that the configuration of other pixels (the shape, arrangement, and connection relationship of each member) is the same as that of the pixel 101.
- the subpixel including the pixel electrodes 17a and 17a ′ is “bright”, and the subpixel including the pixel electrode 17b is “dark”.
- the liquid crystal panel 5b includes an active matrix substrate 3, a color filter substrate 30 facing the active matrix substrate 3, and a liquid crystal layer 40 disposed between both substrates (3, 30).
- the scanning signal lines 16a and 16b are formed on the glass substrate 31, and the inorganic gate insulating film 22 is formed so as to cover them.
- a semiconductor layer 24 i layer and n + layer
- a source electrode 8a in contact with the n + layer a drain electrode 9a, drain lead wires 27a and 27a ', contact electrodes 77a and 77a', and a coupling capacitance electrode 37a is formed, and an inorganic interlayer insulating film 25 is formed so as to cover them.
- Pixel electrodes 17a, 17b and 17a ' are formed on the inorganic interlayer insulating film 25, and an alignment film (not shown) is formed so as to cover these (pixel electrodes 17a, 17b and 17a').
- the contact holes 11a and 11a ′ the inorganic interlayer insulating film 25 is penetrated, whereby the pixel electrode 17a and the contact electrode 77a are connected, and the pixel electrode 17a ′ and the contact electrode 77a ′ are connected. Is connected.
- the coupling capacitor electrode 37a connected to the drain lead wiring 27a overlaps the pixel electrode 17b through the inorganic interlayer insulating film 25, thereby forming the coupling capacitor C101 (see FIG. 31).
- the lead wiring 27a ′ led out from the coupling capacitor electrode 37a is connected to the contact electrode 77a ′, and the contact electrode 77a ′ is connected to the pixel electrode 17a ′ through the contact hole 11a ′.
- the storage capacitor Cha (see FIG. 31) is formed in the overlapping portion of the storage capacitor electrode 38a and the scanning signal line 16d, and the storage capacitor Chb (see FIG. 31) is formed in FIG.
- the storage capacitor electrode 38b and the scanning signal line 16d are formed at the overlapping portion.
- the black matrix 13 and the colored layer 14 are formed on the glass substrate 32, the common electrode (com) 28 is formed thereon, and an alignment film (not shown) is formed so as to cover this. Is formed.
- the liquid crystal panel 5b of FIG. 32 is shown in FIG. It can also be set as such a structure. That is, the pixel electrode 17 a ′ is formed so as to overlap the scanning signal line 16 b through the inorganic interlayer insulating film 25 and the thick organic interlayer insulating film 26. Thereby, the parasitic capacitance between the pixel electrode 17a ′ and the scanning signal line 16b can be reduced, and in particular, the aperture ratio can be improved while suppressing an increase in the load on the scanning signal line 16b.
- liquid crystal panel 2-2 (Specific example of liquid crystal panel 2-2)
- the liquid crystal panel of the present invention is not limited to the configuration in which the rectangular pixel electrodes are arranged in the column direction as described above, and may have a configuration as shown in FIG. .
- a transistor 12a is arranged in the vicinity of the intersection of the data signal line 15x and the scanning signal line 16a, and both the signal lines (15x16a) and the scanning signal line 16b
- the pixel electrode 17a having a trapezoidal shape and the pixel electrode 17a rotated by 180 ° at a position approximately 315 ° with respect to the row direction of the scanning signal line 16a with the pixel electrode 17a as a fulcrum
- a pixel electrode 17a ′ having a trapezoidal shape that substantially matches the shape, and a pixel electrode arranged so as to correspond to (engage with) the shape of the pixel electrodes 17a and 17a ′ in the pixel region excluding the pixel electrodes 17a and 17a ′. 17b.
- each of the pixel electrodes 17a, 17b, and 17a ′ has a part of the pixel electrode 17a close to the scanning signal line 16a, and a part of the pixel electrode 17a ′ close to the scanning signal line 16b.
- One end of the pixel electrode 17b is disposed close to the scanning signal line 16a, and the other end is disposed close to the scanning signal line 16b.
- at least a part of each of the pixel electrodes 17a and 17a ' is disposed in proximity to each of the scanning signal lines 16a and 16b, and the pixel electrode 17b connects the scanning signal lines 16a and 16b to each other. It extends in the row direction.
- the source electrode 8a and the drain electrode 9a of the transistor 12a are formed on the scanning signal line 16a, and the source electrode 8b and the drain electrode 9b of the transistor 12b are formed on the scanning signal line 16b.
- the source electrode 8a is connected to the data signal line 15x.
- the drain electrode 9a is connected to the drain lead wiring 27a, the drain lead wiring 27a is connected to the contact electrode 77a, and the contact electrode 77a is connected to the pixel electrode 17a through the contact hole 11a.
- the drain electrode 9a is connected to the drain lead wiring 28a, the drain lead wiring 28a is connected to the storage capacitor electrode 38a, and the storage capacitor electrode 38a overlaps the scanning signal line 16d through the gate insulating film.
- a storage capacitor Cha see FIG.
- the coupling capacitor electrode 37a overlaps the pixel electrode 17b through an interlayer insulating film, one end of the coupling capacitor electrode 37a is connected to the contact electrode 78a, and the contact electrode 78a is connected to the pixel electrode 17a through the contact hole 12a.
- the other end of the coupling capacitor electrode 37a is connected to the contact electrode 77a ', and the contact electrode 77a' is connected to the pixel electrode 17a 'via the contact hole 11a'.
- a coupling capacitor C101 (see FIG. 31) between the pixel electrodes 17a and 17b is formed, and the pixel electrodes 17a and 17a ′ are electrically connected to each other.
- the source electrode 8b of the transistor 12b is connected to the data signal line 15x.
- the drain electrode 9b is connected to the drain lead wiring 27b
- the drain lead wiring 27b is connected to the contact electrode 77b
- the contact electrode 77b is connected to the pixel electrode 17b through the contact hole 11b.
- the storage capacitor electrode 38b formed in the same layer as the storage capacitor electrode 38a overlaps the scanning signal line 16d through the gate insulating film and is connected to the lead-out wiring 28b.
- the lead-out wiring 28b is connected to the contact electrode 78b.
- the contact electrode 78b is connected to the pixel electrode 17b through the contact hole 12b.
- the holding capacitor Chb (see FIG. 31) is formed. Note that the configuration of other pixels (the shape, arrangement, and connection relationship of each member) is the same as that of the pixel 101.
- the subpixel including the pixel electrodes 17a and 17a ′ is “bright”, and the subpixel including the pixel electrode 17b is “dark”.
- FIG. 36 shows an equivalent circuit diagram corresponding to the specific example 2-3 of the liquid crystal panel 5b
- FIG. 37 shows a specific example 2-3 of the liquid crystal panel 5b.
- three pixel electrodes are formed in each pixel region, and similarly to the liquid crystal panel of FIG. 31, data signal lines (15x and 15X) extending in the column direction (vertical direction in the figure).
- Scanning signal lines (16a to 16f) extending in the row direction (left and right direction in the figure), pixels (100 to 105) arranged in the row and column directions, and a common electrode (counter electrode) com,
- the structure is the same. Note that a pixel column including the pixels 100 to 102 and a pixel column including the pixels 103 to 105 are adjacent to each other.
- the scanning signal line 16c is disposed so as to overlap with one of the two edge portions along the row direction of the pixel 100, and the scanning signal line 16d is disposed so as to overlap with the other.
- Pixel electrodes 17d, 17c and 17d ' are arranged in the column direction between 16c and 16d.
- the scanning signal line 16c overlaps one of the two edge portions along the row direction of the pixel 103, and the scanning signal line 16d overlaps the other, and the pixel between the scanning signal lines 16c and 16d is seen in plan view.
- Electrodes 17D, 17C, and 17D ′ are arranged in the column direction.
- the scanning signal line 16a is formed so as to overlap with one of the two edge portions along the row direction of the pixel 101, and the scanning signal line 16b is formed so as to overlap with the other, and the scanning signal line 16a is viewed in plan view.
- the scanning signal line 16a overlaps one of the two edge portions along the row direction of the pixel 104, and the scanning signal line 16b overlaps the other, and the pixel between the scanning signal lines 16a and 16b in a plan view.
- the source electrode 8a and the drain electrode 9a of the transistor 12a are formed on the scanning signal line 16a, and the source electrode 8b and the drain electrode 9b of the transistor 12b are formed on the scanning signal line 16b.
- the source electrode 8a is connected to the data signal line 15x.
- the drain electrode 9a is connected to the drain lead wiring 27a, the drain lead wiring 27a is connected to the contact electrode 77a and the coupling capacitance electrode 37a, and the contact electrode 77a is connected to the pixel electrode 17a through the contact hole 11a.
- the coupling capacitor electrode 37a overlaps with the pixel electrode 17b through an interlayer insulating film, thereby forming a coupling capacitor C101 (see FIG. 36) between the pixel electrodes 17a and 17b.
- the drain electrode 9a is connected to the drain lead wire 28a, the drain lead wire 28a is connected to the storage capacitor electrode 38a formed in the same layer as the coupling capacitor electrode 37a, and the storage capacitor electrode 38a is scanned through the gate insulating film. This overlaps the signal line 16d, thereby forming a storage capacitor Cha (see FIG. 36).
- the source electrode 8b of the transistor 12b is connected to the data signal line 15x.
- the drain electrode 9b is connected to the drain lead wire 27b
- the drain lead wire 27b is connected to the contact electrodes 77b and 77b 'and the storage capacitor electrode 38b.
- the electrode 77b ′ is connected to the pixel electrode 17b ′ via the contact hole 11b ′.
- the pixel electrodes 17b and 17b ' are electrically connected to each other.
- the storage capacitor electrode 38b formed in the same layer as the storage capacitor electrode 38a overlaps the scanning signal line 16d through the gate insulating film, thereby forming the storage capacitor Chb (see FIG. 36). Note that the configuration of other pixels (the shape, arrangement, and connection relationship of each member) is the same as that of the pixel 101.
- the sub-pixel including the pixel electrode 17a is “bright”, and the sub-pixel including the pixel electrodes 17b and 17b ′ is “dark”.
- liquid crystal panel 2-4 (Specific example of liquid crystal panel 2-4)
- the liquid crystal panel of the present invention is not limited to the configuration in which the rectangular pixel electrodes are arranged in the column direction as described above, and may have a configuration as shown in FIG. .
- a transistor 12a is disposed in the vicinity of the intersection of the data signal line 15x and the scanning signal line 16a, and both the signal lines (15x16a) and the scanning signal line 16b
- a pixel electrode 17b ′ having a trapezoidal shape that substantially matches the shape, and a pixel electrode disposed so as to correspond to (engage with) the shape of the pixel electrodes 17b and 17b ′ in the pixel region excluding the pixel electrodes 17b and 17b ′. 17a.
- each of the pixel electrodes 17b, 17a, and 17b ' has a part of the pixel electrode 17b close to the scanning signal line 16a and a part of the pixel electrode 17b' close to the scanning signal line 16b.
- One end of the pixel electrode 17a is disposed close to the scanning signal line 16a, and the other end is disposed close to the scanning signal line 16b.
- at least a part of each of the pixel electrodes 17b and 17b ' is disposed in proximity to each of the scanning signal lines 16a and 16b, and the pixel electrode 17a connects the scanning signal lines 16a and 16b to each other. It extends in the row direction.
- the source electrode 8a and the drain electrode 9a of the transistor 12a are formed on the scanning signal line 16a, and the source electrode 8b and the drain electrode 9b of the transistor 12b are formed on the scanning signal line 16b.
- the source electrode 8a is connected to the data signal line 15x.
- the drain electrode 9a is connected to the drain lead wiring 27a, the drain lead wiring 27a is connected to the contact electrode 77a, and the contact electrode 77a is connected to the pixel electrode 17a through the contact hole 11a.
- the drain electrode 9a is connected to the drain lead wiring 28a, the drain lead wiring 28a is connected to the storage capacitor electrode 38a, and the storage capacitor electrode 38a overlaps the scanning signal line 16d through the gate insulating film.
- a storage capacitor Cha (see FIG. 36) is formed.
- the source electrode 8b of the transistor 12b is connected to the data signal line 15x.
- the drain electrode 9b is connected to the drain lead wiring 27b, the drain lead wiring 27b is connected to the contact electrode 77b ', and the contact electrode 77b' is connected to the pixel electrode 17b 'via the contact hole 11b'.
- the coupling capacitor electrode 37b overlaps the pixel electrode 17a through an interlayer insulating film, one end of the coupling capacitor electrode 37b is connected to the contact electrode 77b ', and the contact electrode 77b' is connected to the pixel electrode 17b through the contact hole 12b '.
- the other end of the coupling capacitor electrode 37b is connected to the contact electrode 77b, and the contact electrode 77b is connected to the pixel electrode 17b through the contact hole 11b.
- a coupling capacitor C101 (see FIG. 36) between the pixel electrodes 17a and 17b is formed, and the pixel electrodes 17b and 17b ′ are electrically connected to each other.
- the lead-out line 28b drawn from the coupling capacitor electrode 37b is connected to the storage capacitor electrode 38b, and the storage capacitor electrode 38b overlaps the scanning signal line 16d through the gate insulating film.
- the holding capacitor Chb (see FIG. 36) is formed. Note that the configuration of other pixels (the shape, arrangement, and connection relationship of each member) is the same as that of the pixel 101.
- the sub-pixel including the pixel electrode 17a is “bright”, and the sub-pixel including the pixel electrodes 17b and 17b ′ is “dark”.
- each driving method described in the first embodiment can be applied to the driving method in the liquid crystal display device including the liquid crystal panel 5b according to the second embodiment.
- FIG. 39 shows a configuration when the liquid crystal panel 5a shown in FIG. 2 has an MVA structure.
- the liquid crystal panel 5a includes an active matrix substrate, a liquid crystal layer, and a color filter substrate.
- the liquid crystal layer is not illustrated, and only the ribs are illustrated for the color filter substrate.
- 40 is an enlarged plan view of a part of FIG.
- the pixel 101 will be described as an example.
- the pixel 101 includes a sub-pixel including the pixel electrode 17a (hereinafter referred to as “first sub-pixel”) and a sub-pixel including the pixel electrode 17b (hereinafter referred to as “second sub-pixel”). Is done.
- the first subpixel is provided with a first alignment regulating structure including a first rib L1 and slits (pixel electrode slits) S1 to S4, and the second subpixel has a second rib L2 and a slit (pixel).
- a second alignment regulating structure comprising electrode slits S5 to S8 is provided.
- the first sub-pixel located on the scanning signal line 16a side has an end E1 along the scanning signal line 16a and an end E2 facing the second sub-pixel, and is located on the scanning signal line 16b side.
- the subpixel has an end E1 along the scanning signal line 16b and an end E2 facing the end E1.
- a first rib L1 having a V shape when viewed in the row direction (left to right in the figure) is provided, and a start end T is provided at the end E1.
- the end M is located at the end E2, and the portion corresponding to the second subpixel of the color filter substrate also has a V-shape when viewed in the row direction (left to right in the figure).
- the second rib L2 formed is provided such that the start end T is located at the end E1 and the end M is located at the end E2. That is, the direction of the first rib L1 and the direction of the second rib L2 are the same direction.
- the pixel electrode 17a is provided with a plurality of slits S1 to S4 corresponding to the first rib L1
- the pixel electrode 17b is provided with a plurality of slits S5 to S8 corresponding to the second rib L2.
- the slits S1 and S3 are provided on both sides of the slits S1 and S3 so as to be substantially parallel to a portion from the starting end T to the refracting part K of the first rib L1
- the slits S2 and S4 are provided on the refracting part K of the first rib L1.
- the slits S6 and S8 are provided on both sides of the second rib L2 so as to be substantially parallel to the portion from the starting end T to the refracting portion K.
- the slits S5 and S7 are provided on both sides of the second rib L2 so as to be substantially parallel to a portion from the refracting portion K to the terminal end M of the second rib L2.
- the slits S5 to S8 and the second rib L2 The arrangement position is the same as the shape of the slits S1 to S4 and the arrangement position with respect to the first rib L1.
- the angle ( ⁇ TKM) formed by the start end T, the refracting portion K, and the end M is approximately 90 °.
- the slit S1, the one side (TK portion) of the first rib L1, and the slit S3 are parallel to each other and extend obliquely (at about ⁇ 135 °) with respect to the scanning signal line 16a.
- the one side (KM portion) of the first rib L1 and the slit S4 are parallel to each other and extend obliquely (at about ⁇ 45 °) with respect to the scanning signal line 16a, and one side of the first rib L1.
- a part of (TK part) and a part of the slit S3 are located at the end E1 (part along the scanning signal line 16a) of the first subpixel.
- the slit S6, one side (TK portion) of the second rib L2, and the slit S8 are parallel to each other and extend obliquely (about 135 °) with respect to the scanning signal line 16b.
- One side (KM portion) of the rib L2 and the slit S7 are parallel to each other and extend obliquely (at about 45 °) with respect to the scanning signal line 16b, and one side (TK portion) of the second rib L2.
- a part of the slit S8 are located at the end E1 (part along the scanning signal line 16b) of the second subpixel.
- the liquid crystal display device using the present liquid crystal panel 5a an effect that a wide viewing angle can be realized can be obtained.
- the orientations of the ribs L1 and L2 are reversed between two pixels adjacent to each other in the column direction (for example, the pixel 101 and the pixel 104). It is not affected by the disorder of orientation biased to the region. As a result, a liquid crystal display device having excellent viewing angle characteristics can be realized.
- the color filter substrate is provided with ribs.
- the present invention is not limited to this, and slits may be provided instead of the ribs provided on the color filter substrate.
- the present liquid crystal panel at least one of the first and second pixel electrodes (17a and 17b) provided in the pixel region (pixel 101) of the own stage and the second pixel region (pixel 100) corresponding to the previous pixel region (pixel 100).
- the storage capacitor (Cha ⁇ Chb) is formed between the scanning signal line (16d) and the storage signal line (16d)
- the first and second pixel electrodes (17a and 17b) are not limited to this.
- a storage capacitor (Cha ⁇ Chb) may be formed between at least one of the first scanning signal line (16c) corresponding to the preceding pixel region (pixel 100).
- a storage capacitor (Cha / Chb) is formed between at least one of the second scanning signal lines (16c and 16d).
- the present liquid crystal display unit and the liquid crystal display device are configured as follows. That is, the two polarizing plates A and B are attached to both surfaces of the liquid crystal panel (5a and 5b) so that the polarizing axes of the polarizing plates A and B are orthogonal to each other. In addition, you may laminate
- drivers gate driver 202, source driver 201 are connected.
- connection of a driver by a TCP (Tape career Package) method will be described.
- an ACF Anisotropic Conductive Film
- the TCP on which the driver is placed is punched out of the carrier tape, aligned with the panel terminal electrode, and heated and pressure bonded.
- a circuit board 203 PWB: Printed Wiring Board
- the display control circuit 209 is connected to each driver (201, 202) of the liquid crystal display unit 200 via the circuit board 203, and integrated with the lighting device (backlight unit) 204.
- the liquid crystal display device 210 is obtained.
- FIG. 42 (a) shows the configuration of the source driver when a refresh period is provided in the present liquid crystal display device.
- the source driver in this case is provided with a buffer 31, a data output switch SWa, and a refresh switch SWb corresponding to each data signal line.
- the corresponding data d is input to the buffer 31, and the output of the buffer 31 is connected to the output terminal to the data signal line via the data output switch SWa.
- the output terminals corresponding to the two adjacent data signal lines are connected to each other via the refresh switch SWb. That is, each refresh switch SWb is connected in series, and one end thereof is connected to the refresh potential supply source 35 (Vcom).
- the charge share signal sh is input to the gate terminal of the data output switch SWa via the inverter 33, and the charge share signal sh is input to the gate terminal of the refresh switch SWb.
- the source driver shown in FIG. 42A may be configured as shown in FIG. That is, the refresh switch SWc is connected only to the corresponding data signal line and the refresh potential supply source 35 (Vcom), and the refresh switches SWc are not connected in series. In this way, it is possible to quickly supply a refresh potential to each data signal line.
- the refresh potential is Vcom, but the present invention is not limited to this.
- an appropriate refresh potential is calculated based on the level of the signal potential supplied to the same data signal line before one horizontal scanning period and the signal potential to be supplied during the current horizontal scanning period. You may supply to a data signal line.
- the configuration of the source driver in this case is shown in FIG. In this configuration, a data output buffer 110, a refresh buffer 111, a data output switch SWa, and a refresh switch SWe are provided corresponding to each data signal line.
- the corresponding data d is input to the data output buffer 110, and the output of the data output buffer 110 is connected to the output terminal to the data signal line via the data output switch SWa.
- the corresponding non-image data N (the optimum refresh potential determined based on the level of the signal potential supplied before one horizontal scanning period and the signal potential to be supplied during the current horizontal scanning period is set. Corresponding data) is input, and the output of the refresh buffer 111 is connected to the output terminal to the data signal line via the refresh switch SWe.
- potential polarity means high (plus) or low (minus) relative to a reference potential.
- the reference potential may be Vcom (common potential) which is the potential of the common electrode (counter electrode) or any other potential.
- FIG. 44 is a block diagram showing a configuration of the present liquid crystal display device.
- the liquid crystal display device includes a display unit (liquid crystal panel), a source driver (SD), a gate driver (GD), and a display control circuit.
- the source driver drives the data signal line
- the gate driver drives the scanning signal line
- the display control circuit controls the source driver and the gate driver.
- the display control circuit controls a display operation from a digital video signal Dv representing an image to be displayed, a horizontal synchronization signal HSY and a vertical synchronization signal VSY corresponding to the digital video signal Dv from an external signal source (for example, a tuner). For receiving the control signal Dc. Further, the display control circuit, based on the received signals Dv, HSY, VSY, and Dc, uses a data start pulse signal SSP and a data clock as signals for displaying an image represented by the digital video signal Dv on the display unit.
- GOE scanning signal output control signal
- the video signal Dv is output as a digital image signal DA from the display control circuit, and a pulse corresponding to each pixel of the image represented by the digital image signal DA.
- a data clock signal SCK is generated as a signal consisting of the above, a data start pulse signal SSP is generated as a signal that becomes high level (H level) for a predetermined period every horizontal scanning period based on the horizontal synchronization signal HSY, and the vertical synchronization signal VSY
- the gate start pulse signal GSP is generated as a signal that becomes H level only for a predetermined period every one frame period (one vertical scanning period)
- the gate clock signal GCK is generated based on the horizontal synchronization signal HSY, and the horizontal synchronization signal HSY and Based on the control signal Dc, the charge share signal sh and the gate dry Generating an output control signal GOE.
- the digital image signal DA the charge share signal sh, the signal POL for controlling the polarity of the signal potential (data signal potential), the data start pulse signal SSP, and the data clock
- the signal SCK is input to the source driver, and the gate start pulse signal GSP, the gate clock signal GCK, and the gate driver output control signal GOE are input to the gate driver.
- the source driver corresponds to the pixel value in each scanning signal line of the image represented by the digital image signal DA based on the digital image signal DA, the data clock signal SCK, the charge share signal sh, the data start pulse signal SSP, and the polarity inversion signal POL.
- the analog potential (signal potential) to be generated is sequentially generated every horizontal scanning period, and these data signals are output to the data signal lines (for example, 15x and 15X).
- the gate driver generates a gate-on pulse signal based on the gate start pulse signal GSP, the gate clock signal GCK, and the gate driver output control signal GOE, and outputs them to the scanning signal line, thereby selecting the scanning signal line. Drive.
- the data signal line and the scanning signal line of the display unit are driven by the source driver and the gate driver, so that the data is transmitted through the transistor (TFT) connected to the selected scanning signal line.
- TFT transistor
- a signal potential is written from the signal line to the pixel electrode.
- a voltage is applied to the liquid crystal layer of each subpixel, whereby the amount of light transmitted from the backlight is controlled, and an image indicated by the digital video signal Dv is displayed on each subpixel.
- FIG. 45 is a block diagram showing a configuration of a liquid crystal display device 800 for a television receiver.
- the liquid crystal display device 800 includes a liquid crystal display unit 84, a Y / C separation circuit 80, a video chroma circuit 81, an A / D converter 82, a liquid crystal controller 83, a backlight drive circuit 85, a backlight 86, A microcomputer 87 and a gradation circuit 88 are provided.
- the liquid crystal display unit 84 includes a liquid crystal panel and a source driver and a gate driver for driving the liquid crystal panel.
- a composite color video signal Scv as a television signal is input from the outside to the Y / C separation circuit 80, where it is separated into a luminance signal and a color signal.
- These luminance signals and color signals are converted into analog RGB signals corresponding to the three primary colors of light by the video chroma circuit 81, and further, the analog RGB signals are converted into digital RGB signals by the A / D converter 82. .
- This digital RGB signal is input to the liquid crystal controller 83.
- the Y / C separation circuit 80 also extracts horizontal and vertical synchronization signals from the composite color video signal Scv input from the outside, and these synchronization signals are also input to the liquid crystal controller 83 via the microcomputer 87.
- the liquid crystal display unit 84 receives a digital RGB signal from the liquid crystal controller 83 at a predetermined timing together with a timing signal based on the synchronization signal.
- the gradation circuit 88 generates gradation potentials for the three primary colors R, G, and B for color display, and these gradation potentials are also supplied to the liquid crystal display unit 84.
- the backlight drive is performed under the control of the microcomputer 87.
- the circuit 85 drives the backlight 86, so that light is irradiated to the back surface of the liquid crystal panel.
- the microcomputer 87 controls the entire system including the above processing.
- the video signal (composite color video signal) input from the outside includes not only a video signal based on television broadcasting but also a video signal captured by a camera, a video signal supplied via an Internet line, and the like.
- the liquid crystal display device 800 can display images based on various video signals.
- a tuner unit 90 is connected to the liquid crystal display device 800, thereby configuring the television receiver 601.
- the tuner unit 90 extracts a signal of a channel to be received from a received wave (high frequency signal) received by an antenna (not shown), converts the signal to an intermediate frequency signal, and detects the intermediate frequency signal, thereby detecting the television.
- a composite color video signal Scv as a signal is taken out.
- the composite color video signal Scv is input to the liquid crystal display device 800 as described above, and an image based on the composite color video signal Scv is displayed by the liquid crystal display device 800.
- FIG. 47 is an exploded perspective view showing a configuration example of the present television receiver.
- the present television receiver 601 includes a first casing 801 and a second casing 806 in addition to the liquid crystal display device 800 as its constituent elements. It is configured to be sandwiched between one housing 801 and a second housing 806.
- the first housing 801 is formed with an opening 801a through which an image displayed on the liquid crystal display device 800 is transmitted.
- the second housing 806 covers the back side of the liquid crystal display device 800, is provided with an operation circuit 805 for operating the display device 800, and a support member 808 is attached below. Yes.
- the first and second pixel electrodes are provided in one pixel region, and the data signal line, the first and second scanning signal lines, and the data corresponding to the one pixel region are provided.
- a first transistor connected to the signal line and the first scanning signal line, and a second transistor connected to the data signal line and the second scanning signal line are provided, and the first pixel electrode is connected to the first transistor.
- the second pixel electrode is connected to the first pixel electrode via a capacitor and connected to the data signal line via the second transistor, and is connected to the data signal line via the second transistor.
- a storage capacitor is provided between at least one of the first and second pixel electrodes provided in the pixel region and at least one of the first and second scanning signal lines corresponding to the previous pixel region. Made is characterized in that is.
- each pixel electrode in one pixel region is connected to a data signal line through a transistor connected to a different scanning signal line.
- the supply timing can be made different for each pixel electrode. Therefore, for example, before supplying a normal writing signal potential to one pixel electrode, the other pixel electrode capacitively coupled to the pixel electrode is electrically connected to the data signal line through a transistor.
- a signal potential eg, Vcom
- the data signal line is not connected to the pixel electrode (capacitive coupling electrode) that is capacitively coupled to the pixel electrode connected to the data signal line through the transistor without passing through the capacitor. Since the signal potential can be supplied from the capacitor, charges accumulated in the capacitive coupling electrode can be discharged (refreshed). Therefore, it is possible to suppress the occurrence of burn-in of the sub-pixel including the pixel electrode. Further, according to the above configuration, it is not necessary to adjust the channel W / L ratio of the transistor as in the conventional case, and the active matrix substrate can be configured with the same channel size. Therefore, a reduction in display quality due to variations in transistor characteristics can be suppressed, and a common liquid crystal panel can be achieved.
- the storage capacitance of the pixel electrode provided in the pixel region of the own stage is the scanning signal line (first and second scanning signal lines) provided corresponding to the pixel region of the previous stage where the scanning is completed. Therefore, it is possible to increase the value of the storage capacitor and to suppress fluctuations in the value of the storage capacitor. Therefore, display quality can be improved.
- the first scanning signal line in one pixel region, is supplied with a first gate-on pulse signal for supplying the signal potential of the data signal to be displayed to the first pixel electrode.
- the scanning signal line is supplied with a second gate-on pulse signal for supplying a common electrode potential to the second pixel electrode, and at least one of the first and second pixel electrodes provided in the pixel region of the own stage.
- a storage capacitor may be formed between the second scanning signal line corresponding to the preceding pixel region.
- the W / L ratio of the channel of the first transistor ratio of the channel width W to the channel length L
- the W / L ratio of the channel of the second transistor the channel width W to the channel length L
- the active matrix substrate includes a coupling capacitor electrode electrically connected to one of the first and second pixel electrodes, and the coupling capacitor electrode is connected to the first and second pixel electrodes via an insulating film. It can also be set as the structure which overlaps with the other.
- the active matrix substrate includes a first storage capacitor electrode electrically connected to the first pixel electrode and a second storage capacitor electrode electrically connected to the second pixel electrode, and the pixel region of the own stage.
- the first and second storage capacitor electrodes corresponding to 1 may be configured to overlap at least one of the first and second scanning signal lines corresponding to the preceding pixel region via an insulating film.
- the active matrix substrate includes a coupling capacitor electrode formed in the same layer as the conductive electrodes of the first and second transistors, and a first and second storage capacitor electrode, and the coupling capacitor electrode includes the first and second coupling capacitors.
- the first storage capacitor which is electrically connected to one of the two pixel electrodes and overlaps the other of the first and second pixel electrodes via an interlayer insulating film and corresponding to the pixel region of the own stage
- the electrode is electrically connected to the first pixel electrode and overlaps at least one of the first and second scanning signal lines corresponding to the preceding pixel region via a gate insulating film.
- the second storage capacitor electrode corresponding to the pixel region of the stage is electrically connected to the second pixel electrode, and the first and second corresponding to the pixel region of the previous stage are connected via the gate insulating film.
- scanning Route may be configured such that at least one of the overlap.
- a coupling capacitance electrode that overlaps the second pixel electrode in its own pixel region via an interlayer insulating film, and first and second scans corresponding to the previous pixel region via a gate insulating film.
- First and second storage capacitor electrodes overlapping at least one of the signal lines, the first lead-out wiring led out from the conduction electrode of the first transistor and the coupling capacitor electrode are connected in the same layer, and the first The lead-out wiring and the first pixel electrode are connected via a contact hole, and the first lead-out wiring and the first storage capacitor electrode are connected in the same layer, and the conduction electrode of the second transistor
- a second lead-out wiring led out from the second pixel electrode is connected to the second pixel electrode via a contact hole, and a third lead-out wiring led out from the second storage capacitor electrode is connected.
- the said second pixel electrode may be a configuration that is connected through a contact hole.
- a coupling capacitance electrode that overlaps the second pixel electrode in the pixel region of its own stage via an interlayer insulating film, and first and second scans corresponding to the previous pixel region via a gate insulating film.
- First and second storage capacitor electrodes overlapping at least one of the signal lines, and the first lead-out wiring led out from the conduction electrode of the first transistor and the first pixel electrode are connected via a contact hole.
- the first lead-out wiring and the first storage capacitor electrode are connected in the same layer, and the second lead-out wiring led out from the conductive electrode of the second transistor and the second pixel electrode are contact holes.
- the third lead-out line led out from the second storage capacitor electrode and the coupling capacitor electrode are connected in the same layer, and 3 draw-out wire and the said second pixel electrode may be a configuration that is connected through a contact hole.
- a second coupling capacitance electrode that overlaps the first pixel electrode in the pixel region of the own stage through an interlayer insulating film, and the second pixel electrode in the pixel region of the own stage through the interlayer insulating film
- a first coupling capacitor electrode that overlaps, and first and second storage capacitor electrodes that overlap with at least one of the first and second scanning signal lines provided corresponding to the preceding pixel region via a gate insulating film.
- the first lead-out wiring led out from the conductive electrode of the first transistor and the first coupling capacitor electrode are connected in the same layer, and the first lead-out wiring and the first pixel electrode are connected through a contact hole.
- the second lead-out wiring led out from the first storage capacitor electrode and the first pixel electrode are connected through a contact hole, and the second transistor is turned on.
- the third lead-out line led out from the pole and the second pixel electrode are connected via a contact hole, and the fourth lead-out line led out from the second storage capacitor electrode and the second coupling capacitor electrode are in the same layer.
- the fourth lead wiring and the second pixel electrode may be connected via a contact hole.
- the two scanning signal lines correspond to two pixel regions arranged in the row direction, and each pixel region has two pixel electrodes in the column direction.
- the transistors connected to one of the two pixel electrodes adjacent in the row direction are connected to one of the two scanning signal lines, and the transistor connected to the other of the two pixel electrodes is the two It is also possible to adopt a configuration in which the other scanning signal line is connected.
- the overlapping area between the first storage capacitor electrode provided in the pixel region of the own stage and at least one of the first and second scanning signal lines corresponding to the pixel area of the preceding stage is determined by the self-stage.
- the second storage capacitor electrode provided in the pixel region is configured to be equal to the overlapping area of at least one of the first and second scanning signal lines provided corresponding to the preceding pixel region.
- one pixel region is composed of sub-pixel regions corresponding to each pixel electrode, and each sub-pixel region has a predetermined tilt direction of liquid crystal molecules when a voltage is applied to the liquid crystal layer.
- the first to second liquid crystal domains corresponding to the first liquid crystal domain that is the first direction, the second liquid crystal domain that is the second direction, the third liquid crystal domain that is the third direction, and the fourth liquid crystal domain that is the fourth direction, respectively.
- the coupling capacitor electrode may have a configuration in which the coupling capacitor electrode overlaps a boundary between adjacent regions in the first to fourth regions.
- one pixel region is divided into two parts by the first scanning signal line crossing the pixel region, and the first pixel electrode is disposed on one of the two pixel regions, and the second pixel is disposed on the other. It can also be set as the structure by which the electrode is distribute
- the present active matrix substrate may further include a third pixel electrode in one pixel region, and the third pixel electrode may be electrically connected to the first pixel electrode.
- the active matrix substrate further includes a third pixel electrode in one pixel region, and the third pixel electrode is connected to the first pixel electrode through a capacitor and electrically connected to the second pixel electrode. It can also be set as the structure connected to.
- the first to third pixel electrodes in the first to third pixel electrodes, at least a part of the first pixel electrode is close to the first scanning signal line, and at least a part of the third pixel electrode is the first pixel electrode. Close to two scanning signal lines, one end of the second pixel electrode is arranged close to the first scanning signal line, and the other end is arranged close to the second scanning signal line. It can also be configured.
- the present active matrix substrate in the first to third pixel electrodes, at least a part of the second pixel electrode is close to the first scanning signal line, and at least a part of the third pixel electrode is the first pixel electrode. Close to the two scanning signal lines, one end of the first pixel electrode is arranged close to the first scanning signal line, and the other end is arranged close to the second scanning signal line. It can also be configured.
- the sub-pixel including the first pixel electrode when applied to a liquid crystal display device, is a bright sub-pixel, and the sub-pixel including the second pixel electrode is a dark sub-pixel. You can also.
- the sub-pixel including the first and third pixel electrodes when applied to a liquid crystal display device, is a bright sub-pixel, and the sub-pixel including the second pixel electrode is a dark sub-pixel. It can also be.
- the sub-pixel including the first pixel electrode when applied to a liquid crystal display device, is a bright sub-pixel, and the sub-pixel including the second and third pixel electrodes is a dark sub-pixel. It can also be.
- the interlayer insulating film may be configured such that at least a part of a portion overlapping the coupling capacitor electrode is thin.
- the gate insulating film may be configured such that at least a part of the portion overlapping the storage capacitor electrode is thin.
- the interlayer insulating film is composed of an inorganic insulating film and an organic insulating film, but the organic insulating film is removed from at least a part of the portion overlapping with the coupling capacitor electrode. You can also.
- the gate insulating film is composed of an inorganic insulating film and an organic insulating film, but the organic insulating film is removed from at least a part of the portion overlapping with the storage capacitor electrode. You can also.
- the organic insulating film may include at least one of acrylic resin, epoxy resin, polyimide resin, polyurethane resin, novolac resin, and siloxane resin.
- This liquid crystal display device includes any of the active matrix substrates described above, and the second scanning signal line is selected at least once during display.
- the second pixel electrode capacitively coupled to the first pixel electrode connected to the data signal line via the first transistor is electrically connected to the data signal line via the second transistor. Therefore, the charges accumulated in the second pixel electrode can be discharged (refreshed). Therefore, it is possible to suppress the occurrence of burn-in of the subpixel including the second pixel electrode, and it is possible to suppress the display quality from being deteriorated.
- a common electrode potential may be supplied to the data signal line when the second transistor is turned off.
- the first transistor may be turned on when the second transistor is turned off, or the first transistor may be turned off simultaneously when the second transistor is turned off. it can.
- the potentials of the first and second pixel electrodes may be substantially set to the common electrode potential.
- the first gate on-pulse signal supplied to the first scanning signal line and the second gate on-pulse signal supplied to the second scanning signal line are within the same horizontal scanning period.
- the second gate on pulse signal is inactive before the first gate on pulse signal becomes inactive, and the pulse width is less than the pulse width of the first gate on pulse signal. It can also be set as the structure which becomes.
- the first gate on-pulse signal supplied to the first scanning signal line and the second gate on-pulse signal supplied to the second scanning signal line are signals of data signals to be displayed.
- the second gate on pulse signal becomes inactive while the first gate on pulse signal is active, and becomes active one horizontal scanning period before the period during which the potential is supplied to the first pixel electrode. It can also be configured.
- a common electrode potential may be supplied at least twice to all the pixel electrodes in one pixel region in each frame.
- all pixel electrodes in one pixel region are at least The common electrode potential may be supplied twice.
- the polarity of the signal potential of the data signal supplied to each data signal line is inverted every horizontal scanning period, and the polarity of the signal potential of the data signal is inverted for each predetermined period.
- the supply of the data signal to the data signal line is shut off, the data signal lines are short-circuited to each other, and the first and second transistors can be turned on within the predetermined period.
- the liquid crystal display device includes a scanning signal line driving circuit for driving each scanning signal line, and the first and second gate on-pulse signals supplied to the first and second scanning signal lines are the scanning signal lines.
- a configuration may also be adopted in which the output from the same stage of one shift register included in the driver circuit is used.
- the scanning signal line drive circuit includes the shift register, a plurality of logic circuits arranged in a column direction, and an output circuit, and the output of the shift register and the input to the logic circuit
- the pulse widths of the first and second gate-on pulse signals output from the output circuit may be determined based on an output control signal that controls the output of the scanning signal line driving circuit.
- the polarity of the signal potential supplied to the first pixel electrode can be reversed in units of one frame.
- the polarity of the signal potential supplied to the first data signal line can be reversed every horizontal scanning period.
- a signal potential having a reverse polarity can be supplied to each of the first data signal line and the adjacent data signal line in the same horizontal scanning period.
- the present liquid crystal display device includes any one of the active matrix substrates described above, and in a predetermined frame, scans one of the first and second scanning signal lines to a pixel electrode connected to the pixel electrode via a transistor.
- the signal potential is written, and in a frame other than the predetermined frame, the other of the first and second scanning signal lines is scanned to write the signal potential to the pixel electrode connected thereto via the transistor. .
- a transistor connected to one pixel electrode is turned off in a state where a common electrode potential is supplied to the first and second pixel electrodes provided in one pixel, and then a signal is applied to the other pixel electrode.
- a structure in which a potential is written can also be used.
- the transistor connected to the second pixel electrode is turned off with the common electrode potential supplied to the first and second pixel electrodes, and then A signal potential is written to the first pixel electrode, and in the next frame, the transistor connected to the first pixel electrode is turned off in a state where the common electrode potential is supplied to the first and second pixel electrodes.
- a configuration in which a signal potential is written to the second pixel electrode can also be employed.
- the bright subpixels and the dark subpixels are arranged in a checkered pattern in each frame, and the bright subpixels and the dark subpixels can be exchanged in units of one frame, so that display quality can be improved.
- the scanning signal line selected when writing the signal potential among the first and second scanning signal lines is switched for each frame, and the polarity of the signal potential corresponding to the same pixel is changed.
- the scanning signal line selected when writing the signal potential among the first and second scanning signal lines is switched every two consecutive frames, and is inverted every two frames.
- a configuration in which the polarity of the corresponding signal potential is inverted every frame can also be adopted.
- This liquid crystal panel includes the above active matrix substrate.
- the present liquid crystal display unit includes the liquid crystal panel and a driver.
- the liquid crystal display device includes the liquid crystal display unit and a light source device.
- the present television receiver includes the above-described liquid crystal display device and a tuner unit that receives a television broadcast.
- the present invention is not limited to the above-described embodiments, and those obtained by appropriately modifying the above-described embodiments based on common general technical knowledge and those obtained by combining them are also included in the embodiments of the present invention.
- the active matrix substrate of the present invention and the liquid crystal panel provided with the active matrix substrate are suitable for, for example, a liquid crystal television.
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Abstract
Description
図1は本実施の形態1における本液晶パネルの一部を示す等価回路図である。図1に示すように、液晶パネル5aは、列方向(図中上下方向)に延伸するデータ信号線(15x・15X)、行方向(図中左右方向)に延伸する走査信号線(16a~16f)、行および列方向に並べられた画素(100~105)、および共通電極(対向電極)comを備え、各画素の構造は同一の構成である。なお、画素100~102が含まれる画素列と、画素103~105が含まれる画素列とが隣接している。
液晶パネル5aの具体例1-1を図2に示す。図2の液晶パネル5aでは、画素100および画素101に沿うようにデータ信号線15xが設けられ、画素103および画素104に沿うようにデータ信号線15Xが設けられている。
液晶パネル5aの具体例1-2を図7に示す。図7の液晶パネル5aでは、図2の液晶パネルにおける結合容量37aおよびこれに接続されるドレイン引き出し配線27aの一部が省略されている。図7の液晶パネル5aでは、図2の液晶パネルと同様、画素100および画素101に沿うようにデータ信号線15xが設けられ、画素103および画素104に沿うようにデータ信号線15Xが設けられている。
液晶パネル5aの具体例1-3を図8に示す。図8の液晶パネル5aでは、結合容量電極37av・37ahが、暗副画素領域の中央部分において十字状に配されている。この液晶パネル5aは、特に、1つの画素領域(副画素領域)に複数の液晶ドメインを形成する配向分割構造に好適である。配向分割構造では、配向方向(チルト方向)が異なる複数のドメインを形成することにより、視野角特性の向上を図ることができる。この配向分割構造に関する技術は、例えば国際公開公報WO2008/069181に開示されている。図9には、各副画素領域が4つの液晶ドメインA~Dに分割されている状態を示している。なお、図9では、画素100及び画素103を示し、各トランジスタは省略している。このような配向分割構造では、液晶ドメインA~Dのそれぞれが他の液晶ドメインと隣接する境界部分に線CLで示す十字状の暗いライン(暗線)が観察されることになる。そのため、画素領域内に遮光性部材を配置する必要がある場合には、この暗線に重なるように配置することにより、画素の有効開口率を向上させることができる。
次に、上述した液晶パネル5aを備えた本液晶表示装置の駆動方法について説明する。本駆動方法の特徴点としては、概略的には、以下の点が挙げられる。
図10は上述した液晶パネル5aを備えた本液晶表示装置の駆動方法を示すタイミングチャートである。なお、SvおよびSVは、隣接する2本のデータ信号線(例えば、15x・15X)それぞれに供給される信号電位を示し、Ga~Gfは走査信号線16a~16fに供給されるゲートオンパルス信号、Vc・Vd・Va・Vb・VC・VDはそれぞれ、画素電極17c・17d・17a・17b・17C・17Dの電位を示し、shはチャージシェア信号を示している。なお、チャージシェア信号がアクティブ(「H」)の期間は、全データ信号線が互いに短絡されたり、外部から全データ信号線に同一電位が供給されたりすることによってチャージシェアが行われる。
図13は、図10に示す駆動を実現するための、本液晶表示装置のゲートドライバの構成を示す回路図である。図13に示されるように、ゲートドライバGDはシフトレジスタ45、列方向に並ぶ複数のAND回路(66a~66f)、および出力回路46を備える。シフトレジスタ45には、ゲートスタートパルス信号GSPとゲートクロック信号GCKとが入力される。シフトレジスタ45の各段の出力は2系統に分かれ、その一方が奇数番目のAND回路に入力され、これと隣り合う偶数番目のAND回路に他方が入力される。また、ゲートドライバ出力制御信号GOEは2系統の信号(OEx・OEy)からなり、奇数番目のAND回路に信号OExの反転信号が入力され、偶数番目のAND回路に信号OEyの反転信号が入力される。そして、1つのAND回路の出力は出力回路46を経てゲートオンパルス信号となり、1本の走査信号線に供給される。
図15は本液晶表示装置の他の駆動方法を示すタイミングチャートである。この図に示す各記号は、図10に示す記号と同様である。また、この駆動方法においても、図10に示されるように、データ信号線に供給する信号電位の極性を1水平走査期間(1H)ごとに反転させるとともに、各フレームにおける同一番目の水平走査期間に供給される信号電位の極性を1フレーム単位で反転させ、かつ同一水平走査期間においては隣接する2本のデータ信号線に逆極性の信号電位を供給し、各水平走査期間の冒頭においてチャージシェアを行っている。
図17は、図15に示す駆動を実現するための、本液晶表示装置のゲートドライバの構成を示す回路図である。図17に示されるように、ゲートドライバGDはシフトレジスタ45、列方向に並ぶ複数のAND回路(66a~66f)、および出力回路46を備える。シフトレジスタ45には、ゲートスタートパルス信号GSPとゲートクロック信号GCKとが入力される。シフトレジスタ45の各段の出力は2系統に分かれ、その一方が奇数番目のAND回路に入力され、これと隣り合う偶数番目のAND回路に他方が入力される。また、ゲートドライバ出力制御信号GOEは4系統の信号(OEx1・OEx2・OEy1・OEy2)からなり、奇数番目のAND回路に順に信号OEx1・OEx2の反転信号が交互に入力され、偶数番目のAND回路に順に信号OEy1・OEy2の反転信号が交互に入力される。そして、1つのAND回路の出力は出力回路46を経てゲートオンパルス信号となり、1本の走査信号線に供給される。
図19は本液晶表示装置の他の駆動方法を示すタイミングチャートである。上記駆動方法-2では、正規の書き込みの1水平走査期間前に、画素電極17a・17bにVcomを供給した後、画素電極17aへの正規の書き込みが行われるまで、トランジスタ12a・12bをともにオフ状態にしている。これに対して、本駆動方法では、正規の書き込みの1水平走査期間前に、画素電極17a・17bにVcomを供給した後、トランジスタ12bのみをオフ状態にし、トランジスタ12aはオン状態のまま、画素電極17aに信号電位を供給する。以下では、駆動方法-2と重複する内容については説明を省略し、相違点を中心に、画素101を例に挙げて具体的に説明する。
図20は、図19に示す駆動を実現するための、本液晶表示装置のゲートドライバの構成を示す回路図である。図20に示されるように、ゲートドライバGDはシフトレジスタ45、列方向に並ぶ複数のAND回路(66a~66f)、および出力回路46を備える。シフトレジスタ45には、ゲートスタートパルス信号GSPとゲートクロック信号GCKとが入力される。シフトレジスタ45の各段の出力は2系統に分かれ、その一方が奇数番目のAND回路に入力され、これと隣り合う偶数番目のAND回路に他方が入力される。また、ゲートドライバ出力制御信号GOEは3系統の信号(OEx・OEy1・OEy2)からなり、奇数番目のAND回路に信号OExの反転信号が入力され、偶数番目のAND回路に順に信号OEy1・OEy2の反転信号が交互に入力される。そして、1つのAND回路の出力は出力回路46を経てゲートオンパルス信号となり、1本の走査信号線に供給される。
図22は本液晶表示装置の他の駆動方法を示すタイミングチャートである。この図に示す各記号は、図10に示す記号と同様である。また、この駆動方法においても、図10に示されるように、データ信号線に供給する信号電位の極性を1水平走査期間(1H)ごとに反転させるとともに、各フレームにおける同一番目の水平走査期間に供給される信号電位の極性を1フレーム単位で反転させ、かつ同一水平走査期間においては隣接する2本のデータ信号線に逆極性の信号電位を供給し、各水平走査期間の冒頭においてチャージシェアを行っている。
ところで、上記液晶パネルでは、1画素に設けられる2つの画素電極のうちトランジスタに近接する方を該トランジスタに接続しているが、これに限定されない。図23のように、1画素に設けられる2つの画素電極のうちトランジスタから遠い方を該トランジスタに接続してもよい。図23の液晶パネル5aでは、図2の液晶パネルと同様、画素100および画素101に沿うようにデータ信号線15xが設けられ、画素103および画素104に沿うようにデータ信号線15Xが設けられている。
また、図1の液晶パネルを図25に示す構成としてもよい。図25の液晶パネル5aでは、行方向に隣り合う2つの画素の一方ではトランジスタに近接する方の画素電極を該トランジスタに接続し、他方ではトランジスタから遠い方の画素電極を該トランジスタに接続している。図26は、図25の液晶パネル5aの具体例を示している。
また、図26の液晶パネルを図28に示す構成としてもよい。図28の液晶パネルでは、図26の液晶パネルと同様、行方向に隣り合う2つの画素の一方ではトランジスタに近接する方の画素電極を該トランジスタに接続し、他方ではトランジスタから遠い方の画素電極を該トランジスタに接続している。また、図28の液晶パネルでは、画素100・103の列方向の中央部分には、画素100・103それぞれを横切るように走査信号線16cが配され、画素101・104の列方向の中央部分には、画素101・104それぞれを横切る走査信号線16aが配されている。画素100では、走査信号線16cを挟んで列方向に画素電極17c・17dが列方向に並べられ、画素101では、走査信号線16aを挟んで列方向に画素電極17a・17bが列方向に並べられ、画素103では、走査信号線16cを挟んで列方向に画素電極17C・17Dが列方向に並べられ、画素104では、走査信号線16aを挟んで列方向に画素電極17A・17Bが列方向に並べられている。
図31は本実施の形態2における本液晶パネルの一部を示す等価回路図である。図31に示すように、液晶パネル5bは、列方向(図中上下方向)に延伸するデータ信号線(15x・15X)、行方向(図中左右方向)に延伸する走査信号線(16a~16f)、行および列方向に並べられた画素(100~105)、および共通電極(対向電極)comを備え、各画素の構造は同一の構成である。なお、画素100~102が含まれる画素列と、画素103~105が含まれる画素列とが隣接している。
液晶パネル5bの具体例2-1を図32に示す。図32の液晶パネル5bでは、画素100および画素101に沿うようにデータ信号線15xが設けられ、画素103および画素104に沿うようにデータ信号線15Xが設けられている。
ここで、本発明の液晶パネルは、上述したような、矩形状の画素電極が列方向に並んで配される構成に限定されるものではなく、図35に示すような構成であってもよい。
液晶パネル5bの具体例2-3に対応する等価回路図を図36に示し、液晶パネル5bの具体例2-3を図37に示す。図36の液晶パネル5bでは、各画素領域内に画素電極が3つ形成されており、図31の液晶パネルと同様、列方向(図中上下方向)に延伸するデータ信号線(15x・15X)、行方向(図中左右方向)に延伸する走査信号線(16a~16f)、行および列方向に並べられた画素(100~105)、および共通電極(対向電極)comを備え、各画素の構造は同一の構成である。なお、画素100~102が含まれる画素列と、画素103~105が含まれる画素列とが隣接している。
ここで、本発明の液晶パネルは、上述したような、矩形状の画素電極が列方向に並んで配される構成に限定されるものではなく、図38に示すような構成であってもよい。
最後に、本発明の液晶表示ユニットおよび液晶表示装置の構成例について説明する。上記各実施の形態では、以下のようにして、本液晶表示ユニットおよび液晶表示装置を構成する。すなわち、液晶パネル(5a・5b)の両面に、2枚の偏光板A・Bを、偏光板Aの偏光軸と偏光板Bの偏光軸とが互いに直交するように貼り付ける。なお、偏光板には必要に応じて、光学補償シート等を積層してもよい。次に、図41(a)に示すように、ドライバ(ゲートドライバ202、ソースドライバ201)を接続する。ここでは、一例として、ドライバをTCP(Tape Career Package)方式による接続について説明する。まず、液晶パネルの端子部にACF(Anisotoropi Conduktive Film)を仮圧着する。ついで、ドライバが乗せられたTCPをキャリアテープから打ち抜き、パネル端子電極に位置合わせし、加熱、本圧着を行う。その後、ドライバTCP同士を連結するための回路基板203(PWB:Printed Wiring Board)とTCPの入力端子とをACFで接続する。これにより、液晶表示ユニット200が完成する。その後、図41(b)に示すように、液晶表示ユニット200の各ドライバ(201・202)に、回路基板203を介して表示制御回路209を接続し、照明装置(バックライトユニット)204と一体化することで、液晶表示装置210となる。
11a・11a′・11b・11b′ コンタクトホール
12a~12f・12A~12F トランジスタ
15x 15X データ信号線
16a~16f 走査信号線
17a~17f 画素電極
17A~17F 画素電極
17a′~17f′ 画素電極
17A′~17F′ 画素電極
21 有機ゲート絶縁膜
22 無機ゲート絶縁膜
24 半導体層
25 無機層間絶縁膜
26 有機層間絶縁膜
37a・37av・37ah 結合容量電極
37b・37bv・37bh 結合容量電極
38a・38b・38e・38f 保持容量電極
77a・77a′・77b・77b′ コンタクト電極
84 液晶表示ユニット
100~105 画素
601 テレビジョン受像機
800 液晶表示装置
C100~C105 結合容量
Claims (47)
- 1つの画素領域に、第1および第2画素電極が設けられるとともに、
1つの画素領域に対応して、データ信号線と、第1および第2走査信号線と、上記データ信号線および第1走査信号線に接続された第1トランジスタと、上記データ信号線および第2走査信号線に接続された第2トランジスタとが設けられ、
上記第1画素電極は、上記第1トランジスタを介して上記データ信号線に接続され、上記第2画素電極は、上記第1画素電極に容量を介して接続されるとともに、上記第2トランジスタを介して上記データ信号線に接続され、
自段の画素領域に設けられた上記第1および第2画素電極の少なくとも一方と、前段の画素領域に対応する第1および第2走査信号線の少なくとも一方との間に保持容量が形成されていることを特徴とするアクティブマトリクス基板。 - 1つの画素領域において、第1走査信号線には、表示すべきデータ信号の信号電位を第1画素電極へ供給するための第1ゲートオンパルス信号が供給され、第2走査信号線には、共通電極電位を第2画素電極へ供給するための第2ゲートオンパルス信号が供給され、
自段の画素領域に設けられた上記第1および第2画素電極の少なくとも一方と、前段の画素領域に対応する第2走査信号線との間には保持容量が形成されていることを特徴とする請求項1に記載のアクティブマトリクス基板。 - 上記第1トランジスタのチャネルのW/L比(チャネル幅Wのチャネル長Lに対する比)と、上記第2トランジスタのチャネルのW/L比(チャネル幅Wのチャネル長Lに対する比)とが互いに等しいことを特徴とする請求項1または2に記載のアクティブマトリクス基板。
- 上記第1および第2画素電極の一方に電気的に接続された結合容量電極を備え、該結合容量電極は、絶縁膜を介して、上記第1および第2画素電極の他方と重なっていることを特徴とする請求項1または2に記載のアクティブマトリクス基板。
- 上記第1画素電極に電気的に接続された第1保持容量電極と、第2画素電極に電気的に接続された第2保持容量電極とを備え、
自段の画素領域に対応する上記第1および第2保持容量電極は、絶縁膜を介して、上記前段の画素領域に対応する第1および第2走査信号線の少なくとも一方と重なっていることを特徴とする請求項1または2に記載のアクティブマトリクス基板。 - 上記第1および第2トランジスタの導通電極と同層に形成された結合容量電極と第1および第2保持容量電極とを備え、
上記結合容量電極は、上記第1および第2画素電極の一方に電気的に接続されているとともに、層間絶縁膜を介して、上記第1および第2画素電極の他方と重なっており、
自段の画素領域に対応する上記第1保持容量電極は、上記第1画素電極に電気的に接続されているとともに、ゲート絶縁膜を介して、上記前段の画素領域に対応する第1および第2走査信号線の少なくとも一方と重なっており、
自段の画素領域に対応する上記第2保持容量電極は、上記第2画素電極に電気的に接続されているとともに、ゲート絶縁膜を介して、上記前段の画素領域に対応する第1および第2走査信号線の少なくとも一方と重なっていることを特徴とする請求項1または2に記載のアクティブマトリクス基板。 - 層間絶縁膜を介して自段の画素領域の上記第2画素電極と重なる結合容量電極と、ゲート絶縁膜を介して上記前段の画素領域に対応する第1および第2走査信号線の少なくとも一方と重なる第1および第2保持容量電極とを備え、
上記第1トランジスタの導通電極から引き出された第1引き出し配線と上記結合容量電極とが同層で接続され、上記第1引き出し配線と上記第1画素電極とがコンタクトホールを介して接続されているとともに、上記第1引き出し配線と上記第1保持容量電極とが同層で接続されており、
上記第2トランジスタの導通電極から引き出された第2引き出し配線と上記第2画素電極とがコンタクトホールを介して接続され、上記第2保持容量電極から引き出された第3引き出し配線と上記第2画素電極とがコンタクトホールを介して接続されていることを特徴とする請求項1または2に記載のアクティブマトリクス基板。 - 層間絶縁膜を介して自段の画素領域の上記第2画素電極と重なる結合容量電極と、ゲート絶縁膜を介して上記前段の画素領域に対応する第1および第2走査信号線の少なくとも一方と重なる第1および第2保持容量電極とを備え、
上記第1トランジスタの導通電極から引き出された第1引き出し配線と上記第1画素電極とがコンタクトホールを介して接続されているとともに、上記第1引き出し配線と上記第1保持容量電極とが同層で接続されており、
上記第2トランジスタの導通電極から引き出された第2引き出し配線と上記第2画素電極とがコンタクトホールを介して接続され、上記第2保持容量電極から引き出された第3引き出し配線と上記結合容量電極とが同層で接続されているとともに、上記第3引き出し配線と上記第2画素電極とがコンタクトホールを介して接続されていることを特徴とする請求項1または2に記載のアクティブマトリクス基板。 - 層間絶縁膜を介して自段の画素領域の上記第1画素電極と重なる第2結合容量電極と、層間絶縁膜を介して自段の画素領域の上記第2画素電極と重なる第1結合容量電極と、ゲート絶縁膜を介して上記前段の画素領域に対応して設けられた第1および第2走査信号線の少なくとも一方と重なる第1および第2保持容量電極とを備え、
上記第1トランジスタの導通電極から引き出された第1引き出し配線と上記第1結合容量電極とが同層で接続され、上記第1引き出し配線と上記第1画素電極とがコンタクトホールを介して接続されているとともに、上記第1保持容量電極から引き出された第2引き出し配線と上記第1画素電極とがコンタクトホールを介して接続されており、
上記第2トランジスタの導通電極から引き出された第3引き出し配線と上記第2画素電極とがコンタクトホールを介して接続され、上記第2保持容量電極から引き出された第4引き出し配線と上記第2結合容量電極とが同層で接続されているとともに、上記第4引き出し配線と上記第2画素電極とがコンタクトホールを介して接続されていることを特徴とする請求項1または2に記載のアクティブマトリクス基板。 - 走査信号線の延伸方向を行方向とすれば、2本の走査信号線は行方向に並ぶ2つの画素領域に対応し、各画素領域には2つの画素電極が列方向に並べられ、
行方向に隣接する2つの画素電極の一方に接続されるトランジスタが上記2本の走査信号線の一方に接続され、上記2つの画素電極の他方に接続されるトランジスタが上記2本の走査信号線の他方に接続されていることを特徴とする請求項1~9のいずれか1項に記載のアクティブマトリクス基板。 - 自段の画素領域に設けられた上記第1保持容量電極と、上記前段の画素領域に対応する第1および第2走査信号線の少なくとも一方との重なり面積が、自段の画素領域に設けられた上記第2保持容量電極と、上記前段の画素領域に対応して設けられた第1および第2走査信号線の少なくとも一方との重なり面積に等しくなっていることを特徴とする請求項9または10に記載のアクティブマトリクス基板。
- 1つの画素領域は、各画素電極に対応する副画素領域により構成され、
各副画素領域は、液晶層に電圧が印加されたときの液晶分子のチルト方向が予め決められた第1方向である第1液晶ドメイン、第2方向である第2液晶ドメイン、第3方向である第3液晶ドメイン、および第4方向である第4液晶ドメインにそれぞれ対応する、第1~第4領域を有し、
上記結合容量電極は、上記第1~第4領域の内の隣り合う領域どうしの境界と重なっていることを特徴とする請求項4に記載のアクティブマトリクス基板。 - 1つの画素領域は、これを横切る上記第1走査信号線によって2つの部分に分けられ、その一方に上記第1画素電極が配されているとともに、他方に上記第2画素電極が配されていることを特徴とする請求項1に記載のアクティブマトリクス基板。
- 1つの画素領域に、第3画素電極をさらに備え、
上記第3画素電極は、上記第1画素電極と電気的に接続されていることを特徴とする請求項1~9のいずれか1項に記載のアクティブマトリクス基板。 - 1つの画素領域に、第3画素電極をさらに備え、
上記第3画素電極は、上記第1画素電極に容量を介して接続されるとともに、上記第2画素電極と電気的に接続されていることを特徴とする請求項1~9のいずれか1項に記載のアクティブマトリクス基板。 - 上記第1~第3画素電極は、
上記第1画素電極の少なくとも一部が、上記第1走査信号線に近接し、
上記第3画素電極の少なくとも一部が、上記第2走査信号線に近接し、
上記第2画素電極の一方の端部が上記第1走査信号線に近接するとともに、他方の端部が上記第2走査信号線に近接するように配されていることを特徴とする請求項14に記載のアクティブマトリクス基板。 - 上記第1~第3画素電極は、
上記第2画素電極の少なくとも一部が、上記第1走査信号線に近接し、
上記第3画素電極の少なくとも一部が、上記第2走査信号線に近接し、
上記第1画素電極の一方の端部が上記第1走査信号線に近接するとともに、他方の端部が上記第2走査信号線に近接するように配されていることを特徴とする請求項15に記載のアクティブマトリクス基板。 - 液晶表示装置に適用された場合に、上記第1画素電極を含む副画素が明副画素となり、上記第2画素電極を含む副画素が暗副画素となることを特徴とする請求項1~17のいずれか1項に記載のアクティブマトリクス基板。
- 液晶表示装置に適用された場合に、上記第1および第3画素電極を含む副画素が明副画素となり、上記第2画素電極を含む副画素が暗副画素となることを特徴とする請求項14または16に記載のアクティブマトリクス基板。
- 液晶表示装置に適用された場合に、上記第1画素電極を含む副画素が明副画素となり、上記第2および第3画素電極を含む副画素が暗副画素となることを特徴とする請求項15または17に記載のアクティブマトリクス基板。
- 上記層間絶縁膜は、上記結合容量電極と重なる部分の少なくとも一部が薄くなっていることを特徴とする請求項6に記載のアクティブマトリクス基板。
- 上記ゲート絶縁膜は、上記保持容量電極と重なる部分の少なくとも一部が薄くなっていることを特徴とする請求項6に記載のアクティブマトリクス基板。
- 上記層間絶縁膜は、無機絶縁膜と有機絶縁膜とからなるが、上記結合容量電極と重なる部分の少なくとも一部については、有機絶縁膜が除去されていることを特徴とする請求項21に記載のアクティブマトリクス基板。
- 上記ゲート絶縁膜は、無機絶縁膜と有機絶縁膜とからなるが、上記保持容量電極と重なる部分の少なくとも一部については、有機絶縁膜が除去されていることを特徴とする請求項22に記載のアクティブマトリクス基板。
- 上記有機絶縁膜には、アクリル樹脂、エポキシ樹脂、ポリイミド樹脂、ポリウレタン樹脂、ノボラック樹脂、およびシロキサン樹脂の少なくとも1つが含まれていることを特徴とする請求項23または24に記載のアクティブマトリクス基板。
- 請求項1~25のいずれか1項に記載のアクティブマトリクス基板を備え、
表示中に上記第2走査信号線が少なくとも1回選択されることを特徴とする液晶表示装置。 - 上記第2トランジスタがオフするときに、上記データ信号線に共通電極電位が供給されていることを特徴とする請求項26に記載の液晶表示装置。
- 上記第2トランジスタがオフするときに上記第1トランジスタがオン状態であるか、あるいは、上記第2トランジスタがオフするときに上記第1トランジスタが同時にオフすることを特徴とする請求項27に記載の液晶表示装置。
- 上記第2トランジスタがオフするときに、第1および第2画素電極の電位を実質的に共通電極電位にすることを特徴とする請求項26~28のいずれか1項に記載の液晶表示装置。
- 上記第1走査信号線に供給される第1ゲートオンパルス信号と、上記第2走査信号線に供給される第2ゲートオンパルス信号とは、同一の水平走査期間内でアクティブになるとともに、
上記第2ゲートオンパルス信号は、そのパルス幅が上記第1ゲートオンパルス信号のパルス幅未満であり、かつ、上記第1ゲートオンパルス信号が非アクティブになる前に非アクティブになることを特徴とする請求項26~29のいずれか1項に記載の液晶表示装置。 - 上記第1走査信号線に供給される第1ゲートオンパルス信号、および、上記第2走査信号線に供給される第2ゲートオンパルス信号は、表示すべきデータ信号の信号電位が上記第1画素電極へ供給される期間よりも一水平走査期間前にアクティブになるとともに、
上記第2ゲートオンパルス信号は、上記第1ゲートオンパルス信号がアクティブの間に非アクティブになることを特徴とする請求項26~29のいずれか1項に記載の液晶表示装置。 - 各フレームにおいて、1画素領域内の全ての画素電極へ、少なくとも2回、共通電極電位を供給することを特徴とする請求項26~29のいずれか1項に記載の液晶表示装置。
- 各フレームにおいて、表示すべきデータ信号の信号電位が上記第1画素電極へ供給されてから、2/3フレーム期間経過後に、1画素領域内の全ての画素電極へ、少なくとも2回、共通電極電位を供給することを特徴とする請求項32に記載の液晶表示装置。
- 各データ信号線に供給されるデータ信号の信号電位の極性は、一水平走査期間ごとに反転し、
上記データ信号の信号電位の極性が反転するときに、所定期間だけ各データ信号線へのデータ信号の供給が遮断されるとともに、各データ信号線が互いに短絡され、
上記第1および第2トランジスタは、上記所定期間内でオン状態であることを特徴とする請求項26~33のいずれか1項に記載の液晶表示装置。 - 各走査信号線を駆動する走査信号線駆動回路を備え、上記第1および第2走査信号線それぞれに供給される第1および第2ゲートオンパルス信号は、上記走査信号線駆動回路が有する1つのシフトレジスタの同一段からの出力を用いて生成されていることを特徴とする請求項26に記載の液晶表示装置。
- 上記走査信号線駆動回路は、上記シフトレジスタと、列方向に並ぶ複数の論理回路と、出力回路とを備え、
上記論理回路に入力される、上記シフトレジスタの出力と上記走査信号線駆動回路の出力を制御する出力制御信号とに基づいて、上記出力回路から出力される上記第1および第2ゲートオンパルス信号のパルス幅が決定されることを特徴とする請求項35に記載の液晶表示装置。 - 上記第1画素電極に供給される信号電位の極性は、1フレーム単位で反転することを特徴とする請求項26~36のいずれか1項に記載の液晶表示装置。
- 第1データ信号線に供給される信号電位の極性が一水平走査期間ごとに反転することを特徴とする請求項26~37のいずれか1項に記載の液晶表示装置。
- 同一水平走査期間においては、第1データ信号線およびこれに隣接するデータ信号線それぞれに、逆極性の信号電位が供給されることを特徴とする請求項26~38のいずれか1項に記載の液晶表示装置。
- 請求項1~25のいずれか1項に記載のアクティブマトリクス基板を備え、
所定のフレームでは、上記第1および第2走査信号線の一方を走査することでトランジスタを介してこれに接続する画素電極に信号電位を書き込み、
所定のフレーム以外のフレームでは、上記第1および第2走査信号線の他方を走査することでトランジスタを介してこれに接続する画素電極に信号電位を書き込むことを特徴とする液晶表示装置。 - 1つの画素に設けられた第1および第2画素電極に共通電極電位を供給した状態で、一方の画素電極に接続するトランジスタをオフし、その後に他方の画素電極に信号電位を書き込むことを特徴とする請求項40に記載の液晶表示装置。
- 連続する2フレームについて、
最初のフレームでは、上記第1および第2画素電極に共通電極電位を供給した状態で、上記第2画素電極に接続するトランジスタをオフし、その後に上記第1画素電極に信号電位を書き込み、
次のフレームでは、上記第1および第2画素電極に共通電極電位を供給した状態で、上記第1画素電極に接続するトランジスタをオフし、その後に上記第2画素電極に信号電位を書き込むことを特徴とする請求項41に記載の液晶表示装置。 - 上記第1および第2走査信号線のうち信号電位を書き込む際に選択される方の走査信号線を、1フレームごとに切り替えるとともに、同一画素に対応する信号電位の極性を、2フレームごとに反転させるか、あるいは、
上記第1および第2走査信号線のうち信号電位を書き込む際に選択される方の走査信号線を、連続する2フレームごとに切り替えるとともに、同一画素に対応する信号電位の極性を、1フレームごとに反転させることを特徴とする請求項41に記載の液晶表示装置。 - 請求項1~25のいずれか1項に記載のアクティブマトリクス基板を備えることを特徴とする液晶パネル。
- 請求項44に記載の液晶パネルとドライバとを備えることを特徴とする液晶表示ユニット。
- 請求項45に記載の液晶表示ユニットと光源装置とを備えることを特徴とする液晶表示装置。
- 請求項26~43および46のいずれか1項に記載の液晶表示装置と、テレビジョン放送を受信するチューナー部とを備えることを特徴とするテレビジョン受像機。
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