WO2016171096A1 - 液晶表示装置 - Google Patents

液晶表示装置 Download PDF

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Publication number
WO2016171096A1
WO2016171096A1 PCT/JP2016/062226 JP2016062226W WO2016171096A1 WO 2016171096 A1 WO2016171096 A1 WO 2016171096A1 JP 2016062226 W JP2016062226 W JP 2016062226W WO 2016171096 A1 WO2016171096 A1 WO 2016171096A1
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Prior art keywords
picture element
pixel
liquid crystal
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red
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PCT/JP2016/062226
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English (en)
French (fr)
Inventor
櫻井　猛久
Original Assignee
シャープ株式会社
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Priority to US15/568,421 priority Critical patent/US10192501B2/en
Publication of WO2016171096A1 publication Critical patent/WO2016171096A1/ja

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    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0439—Pixel structures
    • G09G2300/0452—Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0242—Compensation of deficiencies in the appearance of colours
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • G09G2330/023—Power management, e.g. power saving using energy recovery or conservation

Definitions

  • the present invention relates to a liquid crystal display device. More specifically, the present invention relates to an active matrix liquid crystal display device.
  • An active matrix liquid crystal display device includes a liquid crystal display panel, a scanning line driving circuit and a signal line driving circuit for supplying a signal to be input to the liquid crystal display panel, and a display control circuit for controlling the entire liquid crystal display device.
  • the liquid crystal display panel for example, aligns the liquid crystal molecules contained in the liquid crystal layer by applying a voltage between the electrodes provided on the liquid crystal layer side of the pair of transparent substrates to the liquid crystal layer sealed in the pair of transparent substrates. Display is performed by generating a phase difference and controlling the amount of light passing through polarizing plates provided outside both substrates.
  • color display is performed by forming a plurality of color filters inside a liquid crystal display panel and mixing the color filters of a plurality of colors side by side.
  • a plurality of signal lines and a plurality of scanning lines intersecting with the plurality of signal lines are formed, and pixel electrodes are arranged in a matrix at these intersections.
  • a thin film transistor TFT
  • the TFT is driven when a scanning line signal is input from a scanning line driving circuit (also referred to as a gate driver), and the signal line voltage input from the signal line driving circuit (also referred to as a source driver) is applied to the liquid crystal layer through the pixel electrode.
  • a scanning line driving circuit also referred to as a gate driver
  • the signal line voltage input from the signal line driving circuit also referred to as a source driver
  • the liquid crystal layer holds the signal line voltage.
  • the liquid crystal display device is generally driven by alternating current in order to protect the characteristics of the liquid crystal material. That is, polarity inversion driving is performed in which voltages having the same magnitude and different polarities are periodically applied to the pixel electrodes.
  • polarity inversion driving for example, frame inversion driving for periodically inverting the polarity of the entire panel, line inversion driving for inverting the polarity for each drive line, and dot inversion driving for changing for each scanning line and each signal line are proposed.
  • the line inversion driving includes gate line inversion driving that inverts every scanning line and source line inversion driving that inverts every signal line.
  • FIG. 9 is a plan view schematically showing the array substrate of the liquid crystal display device of Patent Document 3. As shown in FIG. Taking Patent Document 3 as an example, as shown in FIG.
  • the liquid crystal display panel 300 includes a plurality of data lines Ls and a plurality of scanning signal lines Lg, and the plurality of data lines Ls includes a plurality of scanning signals.
  • a plurality of pixel formation portions Px are provided corresponding to the intersections of the plurality of data lines Ls and the plurality of scanning signal lines Lg, respectively, so as to intersect the line Lg.
  • a portion surrounded by a dotted line corresponds to one pixel.
  • pixel electrodes Lg which are pixel electrodes connected to switching elements that are turned on and off by the same scanning signal line, are distributed in two vertically adjacent rows and three pixel electrodes.
  • “upper, lower, upper” or “lower, upper, lower” series are arranged so as to have periodicity in the horizontal direction with respect to the vertical position.
  • + and ⁇ represent the polarities of signals applied to the pixel electrodes Px
  • R, G, and B represent the colors of the picture elements (red, green, and blue) corresponding to the pixel electrodes Px.
  • Patent Document 3 since signals having the same polarity are applied to the same color in all pixels in the direction of the scanning signal line, there is a problem in that the brightness differs for each row in the scanning signal line direction. Also, in the normally black mode in which black is displayed when no voltage is applied and white is displayed when the voltage is applied, a color change can be visually recognized according to the polarity when white is displayed. There was a problem that occurred.
  • the present invention has been made in view of the above situation, and an object of the present invention is to provide a liquid crystal display device that suppresses the occurrence of color misregistration and has excellent display quality without increasing power consumption. .
  • FIG. 8 is a graph showing the relationship between applied voltage and picture element brightness.
  • the average luminance of the positive polarity (G +) and negative polarity (G-) of the green pixel is maximized with reference to the green pixel having the highest visibility.
  • the voltage V (x) is obtained, and the voltage V (x) is applied to the blue and red picture elements to drive. As shown in FIG.
  • Patent Document 3 in each pixel, a red picture element and a blue picture element are driven with the same polarity, but the brightness differs depending on the polarity between the red picture element and the blue picture element, and A change in color is observed because it is positive and negative and the light and dark are opposite.
  • the sensitivity of red-green hue is higher than that of blue-yellow hue, and the smaller the brightness, the more red-green hue than the change of blue-yellow hue. Is known to be more visible. Therefore, when frame inversion driving is performed with low frequency driving and white display is performed, a hue change of blue-yellow occurs, but it is considered that it is difficult to visually recognize because the sensitivity is small.
  • the present inventor has proposed a red pixel electrode constituting a first pixel in a liquid crystal display device in which a first pixel and a second pixel including a red picture element, a green picture element, and a blue picture element are arranged on a display surface.
  • the first drive signal line connected to the green pixel electrode, the blue pixel electrode constituting the second pixel, the blue pixel electrode constituting the first pixel, and the second pixel
  • the second drive signal line connected to the red and green pixel electrodes performs pseudo-dot inversion driving by the so-called staggered input method to reduce power consumption and cause display defects such as flicker and shadows.
  • the voltage applied to the red pixel electrode and the green pixel electrode is the same polarity for the first pixel and the second pixel, and is applied to the green pixel electrode and the blue pixel electrode.
  • one embodiment of the present invention is a liquid crystal display device in which a first pixel and a second pixel including a red picture element, a green picture element, and a blue picture element are arranged on a display surface, the color filter substrate,
  • the color filter substrate has a red color filter, a green color filter, and a blue color filter
  • the array substrate has the red color filter sandwiched between the liquid crystal layers.
  • a red picture element electrode arranged opposite to the filter, a green picture element electrode arranged opposite to the green color filter across the liquid crystal layer, and an opposite blue color filter across the liquid crystal layer
  • the blue picture element electrode arranged in the first pixel, the red picture element electrode and the green picture element electrode constituting the first pixel, and the blue picture element electrode constituting the second pixel.
  • One drive signal line and the first The blue pixel electrode constituting the pixel, and the second drive signal line connected to the red pixel electrode and the green pixel electrode constituting the second pixel, the first pixel and The voltage applied to the red pixel electrode and the green pixel electrode is the same polarity with respect to the second pixel, and the voltage applied to the green pixel electrode and the blue pixel electrode is opposite in polarity.
  • the liquid crystal display device is driven by alternating voltage.
  • liquid crystal display device of the present invention it is possible to provide a liquid crystal display device that suppresses the occurrence of color misregistration and has excellent display quality without increasing power consumption.
  • FIG. 1 is a schematic plan view showing a liquid crystal display device of Embodiment 1.
  • FIG. 1 is a schematic cross-sectional view showing a liquid crystal display device of Embodiment 1.
  • FIG. 2 is a plan view schematically showing an array substrate of the liquid crystal display device of Embodiment 1.
  • FIG. 6 is a plan view schematically showing an array substrate of a liquid crystal display device of Embodiment 2.
  • FIG. 6 is a plan view schematically showing an array substrate of a liquid crystal display device of Embodiment 3.
  • FIG. 6 is a plan view schematically showing an array substrate of a liquid crystal display device of Embodiment 4.
  • FIG. It is the top view which showed typically the array substrate of the liquid crystal display device of the comparative form 1. It is the graph which showed the relationship between an applied voltage and the brightness of a pixel.
  • FIG. 10 is a plan view schematically showing an array substrate of a liquid crystal display device of Patent Document 3.
  • FIG. 1 is a schematic plan view showing the liquid crystal display device of the first embodiment
  • FIG. 2 is a schematic cross-sectional view showing the liquid crystal display device of the first embodiment
  • FIG. 3 is a plan view schematically showing the array substrate of the liquid crystal display device according to the first embodiment.
  • the first pixel 10 and the second pixel 20 including the red picture element R, the green picture element G, and the blue picture element B are arranged on the display surface.
  • the liquid crystal display device 100A according to the first embodiment includes a color filter substrate 30, a liquid crystal layer 40, and an array substrate 50 in this order.
  • the color filter substrate 30 is a red color filter.
  • the array substrate 50 includes a red pixel electrode 51R disposed opposite to the red color filter 31R with the liquid crystal layer 40 interposed therebetween, and the liquid crystal layer 40. It has a green picture element electrode 51G disposed so as to face the green color filter 31R, and a blue picture element electrode 51B arranged so as to face the blue color filter 31B with the liquid crystal layer 40 interposed therebetween. As shown in FIG. 3, the array substrate 50 is connected to the red picture element electrode 51 ⁇ / b> R and the green picture element electrode 51 ⁇ / b> G constituting the first pixel 10 and the blue picture element electrode 51 ⁇ / b> B constituting the second pixel 20.
  • + and ⁇ represent the polarities of the voltages applied to the respective pixel electrodes.
  • the connection between the picture element electrode and the drive signal line may be such that a switching element such as a thin film transistor may be interposed between the picture element electrode and the drive signal line.
  • the pixel electrode may be driven by the signal.
  • the red color filter 31R, the green color filter 31G, and the blue color filter 31B extend in the column direction in parallel to each other, and the first drive signal line 61 and the second drive signal line 62 are
  • the first pixels 10 and the second pixels 20 are alternately arranged along the column direction and the row direction. Since the positive and negative polarities are compensated for by the picture elements that are adjacent to each other in the top, bottom, left, and right, the occurrence of flicker and vertical and horizontal shadows can be suppressed. Furthermore, the first drive signal line 61 and the second drive signal line 62 are alternately arranged.
  • first pixel 10 and the second pixel 20 are alternately arranged along the column direction and the row direction, signals having different polarities are input in adjacent picture elements, so that a checkerboard display A good display can be performed with no color misalignment even when performing.
  • the array substrate 50 is an active matrix substrate, and a plurality of parallel gate signal lines on a transparent substrate; a plurality of source signal lines extending in a direction orthogonal to the gate signal lines and formed in parallel to each other; Active elements such as TFTs arranged corresponding to the intersections of the gate signal lines and the source signal lines; pixel electrodes arranged in a matrix in the region partitioned by the gate signal lines and the source signal lines, etc. Configuration.
  • the plurality of gate signal lines are connected to a gate driver that applies a scanning signal to the gate signal lines
  • the plurality of source signal lines are connected to a source driver that applies a gradation signal to the source signal lines
  • the pixel electrodes are A configuration in which the gate signal line and the source signal line are connected via a switching element can be given.
  • the first drive signal line 61 and the second drive signal line 62 are gate signal lines, and are connected to a gate driver 70 that applies a scanning signal to the gate signal lines.
  • the picture element electrodes arranged on the same row are connected to the first drive signal line 61 and the second drive signal line 62 which are gate signal lines.
  • the pixel electrodes arranged on the same column are connected to one source signal line, and each pixel electrode is connected to the source signal line and the gate signal line via the TFT. It is connected.
  • the first drive signal line 61 is connected to the first row of pixel electrode groups and the second row of pixel electrode groups arranged with the first drive signal line 61 interposed therebetween. And the three consecutive pixel electrodes of the first row of pixel electrode groups and the three consecutive pixel electrodes of the second row of pixel electrode groups are alternately connected.
  • the second drive signal line 62 includes three consecutive pixel electrodes of the first row of pixel electrode groups, and three consecutive pixel electrodes of the second row of pixel electrode groups; Are connected alternately.
  • the voltage applied to the red picture element electrode 51R and the green picture element electrode 51G has the same polarity, and the voltage applied to the blue picture element electrode 51B has the opposite polarity.
  • AC voltage driving is performed so that For example, when a positive polarity signal is applied to the first drive signal line 61 and a negative polarity signal is applied to the second drive signal line 62, as shown in FIG. 3, the red pixel electrode constituting the first pixel 10.
  • a positive voltage is applied to 51R and the green picture element electrode 51G and the blue picture element electrode 51B that constitutes the second pixel 20, and the blue picture element electrode 51B that constitutes the first pixel 10 and the second picture element electrode 51B.
  • a negative voltage is applied to the red pixel electrode 51 ⁇ / b> R and the green pixel electrode 51 ⁇ / b> G constituting the pixel 20.
  • the green picture element G may be disposed between the red picture element R and the blue picture element B.
  • the red picture element R, the green picture element G, and the blue picture element B since the brightness of the green picture element G is the highest, when the green picture element G is arranged at the end of one pixel, the brightness is increased in one pixel. Is biased. Therefore, when an oblique line is displayed on the display surface, an unnatural display such as jaggedness is observed.
  • an unnatural display such as jaggedness can be made difficult to see even when an oblique line is displayed.
  • the first drive signal line 61 and the second drive signal line 62 extend for the red picture element R, the green picture element G, and the blue picture element B.
  • the red picture element R, the green picture element G, and the blue picture element B are arranged in order from the gate driver 70 side. Therefore, each pixel electrode corresponds to each pixel, as shown in FIG. 3, along the direction in which the first drive signal line 61 and the second drive signal line 62 extend,
  • the red picture element electrode 51R, the green picture element electrode 51G, and the blue picture element electrode 51B are arranged in the arrangement order.
  • Examples of the configuration of the color filter substrate 30 include a configuration in which a black matrix formed in a lattice shape, a counter electrode, and the like are provided on a transparent substrate.
  • the red color filter 31R, the green color filter 31G, and the blue color filter 31B may be formed inside a black matrix formed in a lattice shape.
  • the liquid crystal layer 40 contains liquid crystal molecules. By applying a voltage equal to or higher than the threshold value of the liquid crystal molecules to the liquid crystal layer, the liquid crystal molecules are tilted and display of the liquid crystal display device can be performed.
  • first drive signal line 61 and the second drive signal line 62 those normally used in the field of liquid crystal display devices can be used, for example, metals such as titanium, chromium, aluminum, molybdenum, and the like. It can be formed of an alloy or the like.
  • TFT an amorphous silicon, polysilicon, or oxide semiconductor in which a channel is formed is preferably used. Examples of the oxide semiconductor include indium (In), gallium (Ga), and zinc (Zn).
  • a compound composed of oxygen (O) (In—Ga—Zn—O), indium (In), tin (Tin), zinc (Zn), and a compound composed of oxygen (O) (In -Tin-Zn-O) or a compound (In-Al-Zn-O) made of indium (In), aluminum (Al), zinc (Zn), and oxygen (O) or the like is used. it can.
  • the red picture element electrode 51R, the green picture element electrode 51G, and the blue picture element electrode 51B may be transparent electrodes, for example, indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), tin oxide. It can be formed of a transparent conductive material such as (SnO) or an alloy thereof.
  • An alignment film may be provided between the color filter substrate 30 and the liquid crystal layer 40 and between the array substrate 50 and the liquid crystal layer 40.
  • the alignment film has a function of controlling the alignment of liquid crystal molecules in the liquid crystal layer 40.
  • the alignment film When the voltage applied to the liquid crystal layer 40 is less than the threshold voltage (including no voltage applied), the alignment film mainly functions as a liquid crystal. The orientation of the liquid crystal molecules in the layer 40 is controlled.
  • Polarizing plates may be disposed on the side of the color filter substrate 30 and the array substrate 50 opposite to the liquid crystal layer 40, respectively.
  • a typical example of the polarizing plate is a polyvinyl alcohol (PVA) film obtained by adsorbing and orienting an anisotropic material such as an iodine complex having dichroism.
  • An optical film such as a retardation film may be disposed between the color filter substrate 30 and the polarizing plate and between the array substrate 50 and the polarizing plate.
  • the color filter substrate 30 and the array substrate 50 are bonded together by a sealing material provided so as to surround the periphery of the liquid crystal layer 40, and the liquid crystal layer 40 is held in a predetermined region.
  • a sealing material for example, an epoxy resin containing an inorganic filler or an organic filler and a curing agent can be used.
  • a backlight may be disposed on the back side.
  • a liquid crystal display device having such a configuration is generally called a transmissive liquid crystal display device.
  • the backlight is not particularly limited as long as it emits light including visible light, may emit light including only visible light, and emits light including both visible light and ultraviolet light. There may be.
  • a backlight that emits white light is preferably used.
  • a light emitting diode (LED) is preferably used.
  • visible light means light (electromagnetic wave) having a wavelength of 380 nm or more and less than 800 nm.
  • the liquid crystal display device includes external circuits such as TCP (tape carrier package) and PCB (printed wiring board); optical films such as a viewing angle widening film and a brightness enhancement film; It is comprised by several members, such as a bezel (frame), and may be integrated in the other member depending on the member. Members other than those already described are not particularly limited, and those normally used in the field of liquid crystal display devices can be used, and thus description thereof is omitted.
  • the voltages applied to the red pixel electrode and the green pixel electrode have the same polarity with respect to the first pixel 10 and the second pixel 20, and are applied to the blue pixel electrode.
  • AC voltage driving is performed so that the voltage has a reverse polarity.
  • the green picture element G is disposed between the red picture element R and the blue picture element B.
  • an unnatural display such as a jagged line can be made difficult to see.
  • the first pixel 10 and the second pixel 20 are alternately arranged along the column direction and the row direction, signals having different polarities are input in adjacent picture elements, so that a checkerboard display No color shift is observed even when performing the above, and good display can be performed. Furthermore, since it is a so-called pseudo dot inversion driving method, power consumption can be reduced.
  • FIG. 7 is a plan view schematically showing an array substrate of the liquid crystal display device according to the first comparative embodiment.
  • the red color filter, the green color filter, and the blue color filter extend in the column direction in parallel with each other.
  • a red picture element electrode 251R, a green picture element electrode 251G, and a blue picture element electrode 251B are arranged to face the red color filter, the green color filter, and the blue color filter, respectively, and as shown in FIG.
  • the picture element electrodes arranged on the same row are connected to the gate signal line 260.
  • the gate signal line 260 is connected to the gate driver 270.
  • the pixel electrodes arranged on the same column are connected to one source signal line, and each pixel electrode is connected to the source signal line and the gate signal line via the TFT. ing.
  • the gate signal lines 260 are alternately connected to the first row of pixel electrode groups and the second row of pixel electrode groups arranged across the gate signal lines 260.
  • Comparative Example 1 when low-frequency driving was performed with a normally black liquid crystal display device, a color shift was observed according to the polarity of the applied voltage during white display. In particular, the color shift was very large in the checkered pattern display. Such a display defect can be explained as follows.
  • the polarity of the signal applied from the gate signal line 260 is inverted every frame, the polarity is switched according to the driving frequency.
  • positive polarity is applied to the green picture element electrode 251G
  • negative polarity is applied to the adjacent red picture element electrode 251R and blue picture element electrode 251B. Therefore, the green picture element G is dark, the red picture element R is bright, and the blue picture element B is dark.
  • white display is performed, a color change between cyan and red, which is a combination of green and blue, occurs.
  • Such a color change is close to a change in red-green hue, and thus is easily perceived as a color shift.
  • a checkerboard pattern is displayed, the color difference is emphasized and it becomes easier to perceive.
  • FIG. 4 is a plan view schematically showing an array substrate of the liquid crystal display device according to the second embodiment.
  • the red picture element R, the green picture element G, and the blue picture element B are the first driving signal line 61 and the second driving signal.
  • the blue picture element B, the green picture element G, and the red picture element R are arranged in the arrangement order from the gate driver 70 side along the direction in which the signal line 62 extends. Therefore, each pixel electrode corresponds to each pixel, as shown in FIG.
  • the blue picture element electrode 51B, the green picture element electrode 51G, and the red picture element electrode 51R are arranged in the arrangement order. Also in the second embodiment, as in the first embodiment, it is possible to obtain a liquid crystal display device with excellent display quality by suppressing the occurrence of color misregistration without increasing power consumption.
  • the first drive signal line 61 and the second drive signal line 62 are source signal lines, and the red color filter 31R, the green color filter 31G, and the blue color filter 31B are parallel to each other.
  • the first embodiment is the same as the first embodiment except that the first drive signal line 61 and the second drive signal line 62 extend in the column direction in parallel with each other.
  • FIG. 5 is a plan view schematically showing an array substrate of the liquid crystal display device according to the third embodiment.
  • the first drive signal line 61 and the second drive signal line 62 are source signal lines, and are connected to a source driver 80 that applies a gradation signal to the source signal lines.
  • the picture element electrodes arranged on the same column are connected to the first drive signal line 61 and the second drive signal line 62 which are source signal lines.
  • the picture element electrodes arranged on the same row are connected to one gate signal line, and each picture element electrode is connected to the source signal line and the gate signal line via the TFT. ing.
  • the first drive signal line 61 is connected to the first row of pixel electrode groups and the second row of pixel electrode groups arranged with the first drive signal line 61 interposed therebetween. And the three consecutive pixel electrodes of the first row of pixel electrode groups and the three consecutive pixel electrodes of the second row of pixel electrode groups are alternately connected.
  • the second drive signal line 62 includes three continuous pixel electrodes in the first row of pixel electrode groups, and three continuous pixel electrodes in the second row of pixel electrode groups. Are connected alternately.
  • the red color filter 31R, the green color filter 31G, and the blue color filter 31B extend in the row direction in parallel to each other, and the first drive signal line 61 and the second drive signal line 62 are The first pixels 10 and the second pixels 10 are alternately arranged along the column direction and the row direction. Further, the first drive signal lines 61 and the second drive signal lines 62 are alternately arranged. In the first pixel 10 and the second pixel 20, the red picture element R, the green picture element G, and the blue picture element B are along the direction in which the first drive signal line 61 and the second drive signal line 62 extend. Thus, the red picture element R, the green picture element G, and the blue picture element B are arranged in order from the source driver 80 side.
  • each picture element electrode corresponds to each picture element, as shown in FIG. 5, along the direction in which the first drive signal line 61 and the second drive signal line 62 extend, on the source driver 80 side.
  • the red picture element electrode 51R, the green picture element electrode 51G, and the blue picture element electrode 51B are arranged in the arrangement order.
  • the third embodiment similarly to the first embodiment, it is possible to obtain a liquid crystal display device with excellent display quality by suppressing the occurrence of color misregistration without increasing the power consumption.
  • FIG. 6 is a plan view schematically showing an array substrate of the liquid crystal display device according to the fourth embodiment.
  • the red picture element R, the green picture element G, and the blue picture element B are the first drive signal line 61 and the second drive signal.
  • the blue picture element B, the green picture element G, and the red picture element R are arranged in order from the source driver 80 side. Therefore, each pixel electrode corresponds to each pixel, as shown in FIG.
  • the blue picture element electrode 51B, the green picture element electrode 51G, and the red picture element electrode 51R are arranged in the arrangement order.
  • the fourth embodiment similarly to the first embodiment, it is possible to suppress occurrence of color misregistration and increase the display quality without increasing power consumption.
  • One embodiment of the present invention is a liquid crystal display device in which a first pixel and a second pixel including a red picture element, a green picture element, and a blue picture element are arranged on a display surface, the color filter substrate, a liquid crystal layer, The array substrate, and the color filter substrate includes a red color filter, a green color filter, and a blue color filter, and the array substrate is formed on the red color filter with the liquid crystal layer interposed therebetween.
  • Oppositely arranged red pixel electrode, opposed to the green color filter across the liquid crystal layer, opposed to the blue color filter across the liquid crystal layer A first connected to the arranged blue picture element electrode, the red picture element electrode and the green picture element electrode constituting the first pixel, and the blue picture element electrode constituting the second pixel; Configure the drive signal line and the first pixel.
  • the blue pixel electrode and the second drive signal line connected to the red pixel electrode and the green pixel electrode constituting the second pixel, and the first pixel and the second pixel.
  • the voltage applied to the red pixel electrode and the green pixel electrode has the same polarity, and the voltage applied to the green pixel electrode and the blue pixel electrode has opposite polarity. It may be a liquid crystal display device in which AC voltage driving is performed.
  • the green picture element may be disposed between the red picture element and the blue picture element.
  • the red color filter, the green color filter, and the blue color filter extend in the column direction in parallel with each other, and the first drive signal line and the second drive signal line run in parallel with each other.
  • the first pixels and the second pixels may be alternately arranged along the column direction and the row direction.
  • the column direction is not particularly limited as long as the red color filter, the green color filter, and the blue color filter extend in parallel to each other.
  • the red color filter, the green color filter, and the blue color filter extend in parallel to each other
  • the blue color filters extend in the row direction in parallel with each other
  • the first drive signal line and the second drive signal line extend in the column direction in parallel with each other, along the column direction and the row direction.
  • the first pixel and the second pixel may be alternately arranged.
  • the first drive signal line and the second drive signal line are gate signal lines, and may be connected to a gate driver that applies a scanning signal to the gate signal line.
  • the first drive signal line and the second drive signal line are source signal lines, and may be connected to a source driver that applies a gradation signal to the source signal line.

Abstract

本発明は、消費電力を増加させることなく、色ずれの発生を抑制し、表示品位の優れた液晶表示装置を提供する。本発明の液晶表示装置は、赤絵素、緑絵素及び青絵素を含む第一及び第二の画素が表示面に配列され、カラーフィルタ基板と、液晶層と、アレイ基板とを順に有し、カラーフィルタ基板は、赤色、緑色及び青色のカラーフィルタを有し、アレイ基板は、赤絵素電極と、緑絵素電極と、青絵素電極と、第一の画素を構成する赤絵素電極及び緑絵素電極と、第二の画素を構成する青絵素電極とに接続された第一の駆動信号線と、第一の画素を構成する青絵素電極と、第二の画素を構成する赤絵素電極及び緑絵素電極に接続された第二の駆動信号線とを有し、第一の画素及び第二の画素に対して、赤絵素電極及び緑絵素電極に印加される電圧が同極性であり、緑絵素電極及び青絵素電極に印加される電圧が逆極性となるように交流電圧駆動が行われるものである。

Description

液晶表示装置
本発明は、液晶表示装置に関する。より詳しくは、アクティブマトリクス型の液晶表示装置に関するものである。
アクティブマトリクス型の液晶表示装置は、液晶表示パネルと、液晶表示パネルに入力する信号を供給する走査線駆動回路及び信号線駆動回路と、液晶表示装置の全体を制御する表示制御回路とを備える。液晶表示パネルは、例えば、一対の透明基板に封入された液晶層に、一対の透明基板の液晶層側に設けた電極間に電圧を印加することで、液晶層に含まれる液晶分子の配向を変化させて位相差を発生させ、両基板の外側に設けた偏光板を通過する光の量を制御することで表示を行う。液晶表示装置でカラー表示を行うためには、液晶表示パネル内部に複数色のカラーフィルタを形成し、複数色のカラーフィルタを併置混合することでカラー表示を行っている。
液晶表示パネルには、複数の信号線と、複数の信号線と交差する複数の走査線とを形成し、これらの交点に画素電極をマトリクス状に配置している。上記の各交点にはスイッチング素子として、例えば、薄膜トランジスタ（Ｔｈｉｎ　Ｆｉｌｍ　Ｔｒａｎｓｉｓｔｏｒ：ＴＦＴ）が設けられる。ＴＦＴは、走査線駆動回路（ゲートドライバともいう）から走査線信号が入力された時に駆動され、信号線駆動回路（ソースドライバともいう）から入力された信号線電圧を、画素電極を通じて液晶層に書き込む。走査線駆動回路から走査線信号が入力されない時は、液晶層が信号線電圧を保持している。
液晶表示装置は、一般的に、液晶材料の特性を保護するために交流駆動される。すなわち、大きさが等しく極性の異なる電圧を周期的に画素電極に印加する、極性反転駆動が行われる。極性反転駆動としては、例えば、パネル全体で周期的に極性を反転させるフレーム反転駆動、駆動線ごとに極性を反転させるライン反転駆動、走査線ごとかつ信号線ごとに変化させるドット反転駆動が提案されている。ライン反転駆動には、走査線ごとに反転するゲートライン反転駆動、信号線ごとに反転させるソースライン反転駆動がある。
ライン反転駆動が用いられる場合、線状に同一極性の電圧が印加された画素電極が並ぶため、輝度の違いによるスジ、フリッカー、シャドー等の表示の不具合が視認されることがある。ドット反転駆動では、絵素ごとに極性が反転されるため、ライン反転駆動でみられるような表示の不具合は見られないが、同時に出力する電圧が駆動電圧の倍になるため、駆動ＩＣの消費電力が大きいという問題があった。
そこで、液晶表示装置の駆動電圧を低減するために、ライン反転駆動において、同一の駆動線に接続される画素を、その駆動線の同一線上ではなく上下・左右等にずれた配置とする、いわゆる千鳥入力方式による疑似ドット反転駆動が考案されている（例えば、特許文献１～６等）。疑似ドット反転駆動を行うことで、ドット反転駆動と同様に表示の不具合を改善できる。図９は、特許文献３の液晶表示装置のアレイ基板を模式的に示した平面図である。特許文献３を例に挙げると、図９に示したように、液晶表示パネル３００は、複数のデータ線Ｌｓと、複数の走査信号線Ｌｇとを備え、複数のデータ線Ｌｓは複数の走査信号線Ｌｇと交差するように格子状に配設され、複数のデータ線Ｌｓと複数の走査信号線Ｌｇとの交差点に対応して複数の画素形成部Ｐｘがそれぞれ設けられている。Ｒｊ、Ｇｊ、Ｂｊ（ｊ＝１、２、３）は、データ線Ｌｓにそれぞれ印加されるデータ信号を表し、ＳＳ１、ＳＳ２、ＳＳ３、ＳＳ４は、走査信号線Ｌｇにそれぞれ印加される走査信号を表す。点線で囲んだ部分が一画素に対応する。特許文献３では、同一走査信号線によってオンおよびオフされるスイッチング素子に接続される画素電極である同時選択画素電極Ｌｇは、上下に隣接する２行に分散的に、かつ、３個の画素電極Ｐｘについての「上、下、上」または「下、上、下」という系列を単位として上下位置につき水平方向に周期性を有するように配置されている。図９中、＋及び－は、画素電極Ｐｘに印加される信号の極性を表し、Ｒ、Ｇ及びＢは各画素電極Ｐｘに対応する絵素の色（赤色、緑色、青色）を表す。
特開昭６０－３６９８号公報 特開平４－２２３４２８号公報 特開２００３－１７７３７５号公報 特開２００６－１０６０６２号公報 特開２００９－１６３２３８号公報 特開２０１５－１６１８号公報
特許文献３では、走査信号線の方向にすべての画素で同じ色には同じ極性の信号が印加されるため、走査信号線方向に１行ごとに明るさが異なるという問題があった。また、電圧を無印加状態で黒表示、印加時に白表示を行うノーマリブラックモードにおいて、低周波駆動を行う場合、白表示の際に極性に応じて色の変化が視認される、いわゆる色ずれが発生するという問題があった。
本発明は、上記現状に鑑みてなされたものであり、消費電力を増加させることなく、色ずれの発生を抑制し、表示品位の優れた液晶表示装置を提供することを目的とするものである。
本発明者は、低周波駆動でフレーム反転駆動を行った場合、白表示の際に色ずれの現象が見られる原因を検討した。そして、印加電圧を変化させながら赤色、緑色、青色の単色表示を確認すると、極性により明るさが違うことを見出した。図８は、印加電圧と絵素の明るさの関係を示したグラフである。液晶表示装置で白色の表示を行う場合、視感度が最大である緑色の絵素を基準とし、緑色の絵素の正極性（Ｇ＋）と負極性（Ｇ－）の平均輝度が最大となるような電圧Ｖ（ｘ）を求め、青色及び赤色の絵素にも電圧Ｖ（ｘ）を印加して駆動する。図８に示したように、電圧Ｖ（ｘ）を印加すると、緑色の絵素と赤色の絵素は、正極性（Ｇ＋、Ｒ＋）の時には暗く、負極性（Ｇ－、Ｒ－）では明るくなるが、青色の絵素は逆に正極性（Ｂ＋）の時には明るく、負極性（Ｂ－）では暗くなる。そのため白表示を行うと、正極性では青く、負極性では赤と緑の合成である黄に表示されることになり、駆動周波数が低いと色の変化が顕著に観察されることを見出した。特許文献３では、それぞれの画素において、赤色の絵素と青色の絵素とが同じ極性で駆動されるが、赤色の絵素と青色の絵素とでは、極性により明るさが異なり、かつ、正負極性で明暗が反対であるため、色の変化が観測される。
また、色度の時間周波数特性として、赤－緑の色相の方が青－黄の色相よりも感度が高いこと、輝度が小さいほど、青－黄の色相の変化よりも、赤－緑の色相の方が視認されやすいことが知られている。そのため、低周波駆動でフレーム反転駆動を行い、白表示にすると、青－黄の色相の変化も起こるが、感度が小さいため視認されにくいと考えられる。
そこで、本発明者は、赤絵素、緑絵素及び青絵素を含む第一の画素及び第二の画素が表示面に配列された液晶表示装置において、第一の画素を構成する赤絵素電極及び緑絵素電極と、第二の画素を構成する青絵素電極とに接続された第一の駆動信号線と、第一の画素を構成する青絵素電極と、第二の画素を構成する赤絵素電極及び緑絵素電極に接続された第二の駆動信号線により、いわゆる千鳥入力方式による疑似ドット反転駆動を行うことで消費電力を低くし、フリッカーやシャドー等の表示不具合の発生を抑制し、かつ、上記第一の画素及び上記第二の画素に対して、赤絵素電極及び緑絵素電極に印加される電圧を同極性とし、上記緑絵素電極及び青絵素電極に印加される電圧が逆極性となるように交流電圧駆動を行うことで、色ずれの発生を抑制できることを見出した。これにより、上記課題をみごとに解決することができることに想到し、本発明に到達することができた。
すなわち、本発明の一態様は、赤絵素、緑絵素及び青絵素を含む第一の画素及び第二の画素が表示面に配列された液晶表示装置であって、カラーフィルタ基板と、液晶層と、アレイ基板とを順に有し、上記カラーフィルタ基板は、赤色のカラーフィルタ、緑色のカラーフィルタ及び青色のカラーフィルタを有し、上記アレイ基板は、上記液晶層を挟んで上記赤色のカラーフィルタに対向して配置された赤絵素電極と、上記液晶層を挟んで上記緑色のカラーフィルタに対向して配置された緑絵素電極と、上記液晶層を挟んで上記青色のカラーフィルタに対向して配置された青絵素電極と、上記第一の画素を構成する上記赤絵素電極及び上記緑絵素電極と、上記第二の画素を構成する上記青絵素電極とに接続された第一の駆動信号線と、上記第一の画素を構成する上記青絵素電極と、上記第二の画素を構成する上記赤絵素電極及び上記緑絵素電極に接続された第二の駆動信号線とを有し、上記第一の画素及び上記第二の画素に対して、上記赤絵素電極及び上記緑絵素電極に印加される電圧が同極性であり、上記緑絵素電極及び上記青絵素電極に印加される電圧が逆極性となるように交流電圧駆動が行われる液晶表示装置である。
本発明の液晶表示装置によれば、消費電力を増加させることなく、色ずれの発生を抑制し、表示品位の優れた液晶表示装置を提供することができる。
実施形態１の液晶表示装置を示した平面模式図である。 実施形態１の液晶表示装置を示した断面模式図である。 実施形態１の液晶表示装置のアレイ基板を模式的に示した平面図である。 実施形態２の液晶表示装置のアレイ基板を模式的に示した平面図である。 実施形態３の液晶表示装置のアレイ基板を模式的に示した平面図である。 実施形態４の液晶表示装置のアレイ基板を模式的に示した平面図である。 比較形態１の液晶表示装置のアレイ基板を模式的に示した平面図である。 印加電圧と絵素の明るさの関係を示したグラフである。 特許文献３の液晶表示装置のアレイ基板を模式的に示した平面図である。
以下、本発明の実施形態について説明する。本発明は、以下の実施形態に記載された内容に限定されるものではなく、本発明の構成を充足する範囲内で、適宜設計変更を行うことが可能である。
（実施形態１）
図１は、実施形態１の液晶表示装置を示した平面模式図であり、図２は、実施形態１の液晶表示装置を示した断面模式図である。図３は、実施形態１の液晶表示装置のアレイ基板を模式的に示した平面図である。図１に示したように、実施形態１の液晶表示装置１００Ａは、赤絵素Ｒ、緑絵素Ｇ及び青絵素Ｂを含む第一の画素１０及び第二の画素２０が表示面に配列されている。また、図２に示したように、実施形態１の液晶表示装置１００Ａは、カラーフィルタ基板３０と、液晶層４０と、アレイ基板５０とを順に有し、カラーフィルタ基板３０は、赤色のカラーフィルタ３１Ｒ、緑色のカラーフィルタ３１Ｇ及び青色のカラーフィルタ３１Ｂを有し、アレイ基板５０は、液晶層４０を挟んで赤色のカラーフィルタ３１Ｒに対向して配置された赤絵素電極５１Ｒと、液晶層４０を挟んで緑色のカラーフィルタ３１Ｒに対向して配置された緑絵素電極５１Ｇと、液晶層４０を挟んで青色のカラーフィルタ３１Ｂに対向して配置された青絵素電極５１Ｂとを有する。アレイ基板５０は、図３に示したように、第一の画素１０を構成する赤絵素電極５１Ｒ及び緑絵素電極５１Ｇと、第二の画素２０を構成する青絵素電極５１Ｂとに接続された第一の駆動信号線６１と、第一の画素１０を構成する青絵素電極５１Ｂと、第二の画素２０を構成する赤絵素電極５１Ｒ及び緑絵素電極５１Ｇに接続された第二の駆動信号線６２とを有する。図３中、＋及び―は、各絵素電極に印加された電圧の極性を表す。なお、本明細書において、絵素電極と駆動信号線との接続は、絵素電極と駆動信号線との間に薄膜トランジスタ等のスイッチング素子が介在してもよく、駆動信号線に印加された電気信号によって絵素電極が駆動されればよい。
実施形態１では、赤色のカラーフィルタ３１Ｒ、緑色のカラーフィルタ３１Ｇ及び青色のカラーフィルタ３１Ｂは、互いに平行に列方向に伸び、第一の駆動信号線６１、及び、第二の駆動信号線６２は、互いに平行に行方向に伸び、上記列方向及び上記行方向に沿って、第一の画素１０と第二の画素２０を交互に配置した。上下左右ともに隣り合う絵素で正負極性を補償し合うため、フリッカーや縦・横シャドーの発生を抑えられる。更に、第一の駆動信号線６１、及び、第二の駆動信号線６２を交互に配置した。上記列方向及び上記行方向に沿って、第一の画素１０と第二の画素２０が交互に配置されることで、隣り合う絵素で極性の異なる信号が入力されるため、市松模様の表示を行った際でも色ずれが見られない、良好な表示が行える。
アレイ基板５０は、アクティブマトリクス基板であり、透明基板上に複数本の平行なゲート信号線；ゲート信号線に対して直交する方向に伸び、かつ互いに平行に形成された複数本のソース信号線；ゲート信号線とソース信号線との交点に対応して配置されたＴＦＴ等のアクティブ素子；ゲート信号線とソース信号線とによって区画された領域にマトリクス状に配置された絵素電極等が設けられた構成が挙げられる。複数のゲート信号線は、ゲート信号線に走査信号を印加するゲートドライバに接続されて、複数のソース信号線は、ソース信号線に階調信号を印加するソースドライバに接続され、絵素電極は、スイッチング素子を介してゲート信号線及びソース信号線に接続される構成が挙げられる。
実施形態１では、第一の駆動信号線６１及び第二の駆動信号線６２は、ゲート信号線であり、上記ゲート信号線に走査信号を印加するゲートドライバ７０に接続されている。図３に示したように、同一行上に配列した絵素電極は、ゲート信号線である第一の駆動信号線６１及び第二の駆動信号線６２に接続される。また、図示はしていないが、同一列上に配列した絵素電極は、一本のソース信号線に接続され、それぞれの絵素電極は、ＴＦＴを介してソース信号線とゲート信号線とに接続されている。このような構成とすることで、疑似ドット反転駆動とし消費電力を抑えることができる。また、実施形態１では、第一の駆動信号線６１は、第一の駆動信号線６１を挟んで配列した第一行目の絵素電極群及び第二行目の絵素電極群に接続され、かつ、上記第一行目の絵素電極群の連続する三つの絵素電極と、上記第二行目の絵素電極群の連続する三つの絵素電極とに交互に接続される。第二の駆動信号線６２も同様に、上記第一行目の絵素電極群の連続する三つの絵素電極と、上記第二行目の絵素電極群の連続する三つの絵素電極とに交互に接続される。
第一の画素１０及び第二の画素２０に対して、赤絵素電極５１Ｒ及び緑絵素電極５１Ｇに印加される電圧が同極性であり、青絵素電極５１Ｂに印加される電圧が逆極性となるように交流電圧駆動が行われる。例えば、第一の駆動信号線６１に正極性、第二の駆動信号線６２に負極性の信号が印加されると、図３に示したように、第一の画素１０を構成する赤絵素電極５１Ｒ及び緑絵素電極５１Ｇと、第二の画素２０を構成する青絵素電極５１Ｂには、正極性の電圧が印加され、第一の画素１０を構成する青絵素電極５１Ｂと、第二の画素２０を構成する赤絵素電極５１Ｒ及び緑絵素電極５１Ｇには、負極性の電圧が印加される。これにより、第一の画素１０は、赤絵素Ｒ、緑絵素Ｇ、青絵素Ｂのすべてが暗くなり、第二の画素２０は、赤絵素Ｒ、緑絵素Ｇ、青絵素Ｂのすべてが明るくなる。そのため、低周波数で交流駆動を行っても色ずれの発生を抑制することができる。
第一の画素１０及び第二の画素２０において、緑絵素Ｇは、赤絵素Ｒと青絵素Ｂの間に配置されてもよい。赤絵素Ｒ、緑絵素Ｇ、青絵素Ｂでは、緑絵素Ｇの明るさが最も大きいため、緑絵素Ｇを一つの画素の端に配置した場合には、一画素の中で明るさが偏る。そのため、表示面に斜めの線を表示した場合に、ギザギザ等の不自然な表示が観察される。緑絵素Ｇを赤絵素Ｒと青絵素Ｂの間に配置することで、斜めの線を表示した場合でもギザギザ等の不自然な表示を見えにくくすることができる。実施形態１では、第一の画素１０及び第二の画素２０において、赤絵素Ｒ、緑絵素Ｇ、青絵素Ｂは、第一の駆動信号線６１及び第二の駆動信号線６２が伸びる方向に沿って、ゲートドライバ７０側から、赤絵素Ｒ、緑絵素Ｇ、青絵素Ｂの並び順で配置される。そのため、各絵素電極は、各絵素に対応して、図３に示したように、第一の駆動信号線６１及び第二の駆動信号線６２が伸びる方向に沿って、ゲートドライバ７０側から、赤絵素電極５１Ｒ、緑絵素絵素電極５１Ｇ、青絵素絵素電極５１Ｂの並び順で配置される。
カラーフィルタ基板３０の構成としては、透明基板上に、格子状に形成されたブラックマトリクス、対向電極等が設けられた構成が挙げられる。赤色のカラーフィルタ３１Ｒ、緑色のカラーフィルタ３１Ｇ及び青色のカラーフィルタ３１Ｂは、格子状に形成されたブラックマトリクスの内側に形成されてもよい。
液晶層４０は、液晶分子を含有する。液晶層に液晶分子の閾値以上の電圧を印加することで、液晶分子が傾斜し、液晶表示装置の表示を行うことができる。
第一の駆動信号線６１及び第二の駆動信号線６２としては、液晶表示装置の分野において通常使用されるものを用いることができ、例えば、チタン、クロム、アルミニウム、モリブデン等の金属、それらの合金等で形成することができる。上記ＴＦＴとしては、アモルファスシリコン、ポリシリコン又は酸化物半導体を用いてチャネルを形成したものが好適に用いられ、酸化物半導体としては、例えば、インジウム（Ｉｎ）、ガリウム（Ｇａ）、亜鉛（Ｚｎ）、及び、酸素（Ｏ）から構成される化合物（Ｉｎ－Ｇａ－Ｚｎ－Ｏ）、インジウム（Ｉｎ）、スズ（Ｔｉｎ）、亜鉛（Ｚｎ）、及び、酸素（Ｏ）から構成される化合物（Ｉｎ－Ｔｉｎ－Ｚｎ－Ｏ）、又は、インジウム（Ｉｎ）、アルミニウム（Ａｌ）、亜鉛（Ｚｎ）、及び、酸素（Ｏ）から構成される化合物（Ｉｎ－Ａｌ－Ｚｎ－Ｏ）等を用いることができる。
赤絵素電極５１Ｒ、緑絵素電極５１Ｇ及び青絵素電極５１Ｂは、透明電極であってもよく、例えば、酸化インジウム錫（ＩＴＯ）、酸化インジウム亜鉛（ＩＺＯ）、酸化亜鉛（ＺｎＯ）、酸化スズ（ＳｎＯ）等の透明導電材料、又は、それらの合金で形成することができる。
カラーフィルタ基板３０と液晶層４０との間、及び、アレイ基板５０と液晶層４０との間に、それぞれ配向膜を有してもよい。配向膜は、液晶層４０中の液晶分子の配向を制御する機能を有し、液晶層４０への印加電圧が閾値電圧未満（電圧無印加を含む）のときには、主に配向膜の働きによって液晶層４０中の液晶分子の配向が制御される。
カラーフィルタ基板３０及びアレイ基板５０の液晶層４０と反対側には、それぞれ偏光板（直線偏光子）が配置されてもよい。偏光板としては、典型的には、ポリビニルアルコール（ＰＶＡ）フィルムに、二色性を有するヨウ素錯体等の異方性材料を、吸着配向させたものが挙げられる。また、カラーフィルタ基板３０と偏光板との間、及び、アレイ基板５０と偏光板との間には、位相差フィルム等の光学フィルムが配置されていてもよい。
液晶表示パネルは、通常では、液晶層４０の周囲を囲むように設けられたシール材によってカラーフィルタ基板３０及びアレイ基板５０が貼り合わされ、液晶層４０が所定の領域に保持される。シール材としては、例えば、無機フィラー又は有機フィラー及び硬化剤を含有するエポキシ樹脂等を用いることができる。
実施形態１の液晶表示装置は、背面側にバックライトを配置してもよい。このような構成を有する液晶表示装置は、一般的に、透過型の液晶表示装置と呼ばれる。バックライトとしては、可視光を含む光を発するものであれば特に限定されず、可視光のみを含む光を発するものであってもよく、可視光及び紫外光の両方を含む光を発するものであってもよい。液晶表示装置によるカラー表示が可能とするためには、白色光を発するバックライトが好適に用いられる。バックライトの種類としては、例えば、発光ダイオード（ＬＥＤ）が好適に用いられる。なお、本明細書において、「可視光」とは、波長３８０ｎｍ以上、８００ｎｍ未満の光（電磁波）を意味する。
更に、上記液晶表示装置は、液晶表示パネル及びバックライトの他、ＴＣＰ（テープ・キャリア・パッケージ）、ＰＣＢ（プリント配線基板）等の外部回路；視野角拡大フィルム、輝度向上フィルム等の光学フィルム；ベゼル（フレーム）等の複数の部材により構成されるものであり、部材によっては、他の部材に組み込まれていてもよい。既に説明した部材以外の部材については特に限定されず、液晶表示装置の分野において通常使用されるものを用いることができるので、説明を省略する。
実施形態１では、第一の画素１０及び第二の画素２０に対して、上記赤絵素電極及び上記緑絵素電極に印加される電圧が同極性であり、上記青絵素電極に印加される電圧が逆極性となるように交流電圧駆動が行われる。これにより、一つの画素において、正極性が印加された場合は、赤絵素Ｒ、緑絵素Ｇ及び青絵素Ｂの全てが暗くなり、負極性が印加された場合は、赤絵素Ｒ、緑絵素Ｇ及び青絵素Ｂの全てが明るくなるため、色ずれの発生を抑制することができる。また、第一の画素１０及び第二の画素２０において、緑絵素Ｇは、赤絵素Ｒと青絵素Ｂの間に配置される。これにより、斜めの線を表示した場合でもギザギザが等の不自然な表示を見えにくくすることができる。上記列方向及び上記行方向に沿って、第一の画素１０と第二の画素２０が交互に配置されることで、隣り合う絵素で極性の異なる信号が入力されるため、市松模様の表示を行った際でも色ずれが見られず、良好な表示を行うことができる。更に、いわゆる疑似ドット反転駆動方式であるため、消費電力を低くすることができる。
（比較形態１）
ゲート信号線を挟んだ上下の絵素電極に交互に接続した比較形態１について以下に説明する。図７は、比較形態１の液晶表示装置のアレイ基板を模式的に示した平面図である。比較形態１の液晶表示装置２００では、赤色のカラーフィルタ、緑色のカラーフィルタ及び青色のカラーフィルタは、互いに平行に列方向に伸びている。また、赤色のカラーフィルタ、緑色のカラーフィルタ、青色のカラーフィルタに対向して、それぞれ赤絵素電極２５１Ｒ、緑絵素電極２５１Ｇ、青絵素電極２５１Ｂが配置され、図７に示したように、同一行上に配列した絵素電極は、ゲート信号線２６０に接続されている。ゲート信号線２６０は、ゲートドライバ２７０に接続されている。図示はしていないが、同一列上に配列した絵素電極は、一本のソース信号線に接続され、それぞれの絵素電極は、ＴＦＴを介してソース信号線とゲート信号線とに接続されている。ゲート信号線２６０は、ゲート信号線２６０を挟んで配列した第一行目の絵素電極群及び第二行目の絵素電極群に交互に接続される。
比較形態１では、ノーマリブラックの液晶表示装置で低周波駆動を行うと、白表示の際に印加電圧の極性に応じて色ずれが観察された。特に市松模様の表示において色ずれが非常に大きく見られた。このような表示の不具合は以下のように説明できる。
ゲート信号線２６０から印加される信号は、フレームごとに極性が反転されるため、駆動周波数に応じて極性が入れ替わることになる。緑絵素電極２５１Ｇに正極性を印加したとき、隣り合う赤絵素電極２５１Ｒと青絵素電極２５１Ｂには負極性が印加されることになる。そのため、緑絵素Ｇは暗く、赤絵素Ｒは明るく、青絵素Ｂは暗く表示される。このため、白表示を行うと緑色と青色の合成であるシアン色と赤色との色変化が起こる。このような色変化は、赤－緑の色相の変化と近いため、色ずれとして知覚されやすい。さらに市松模様の表示を行うと、その色差が強調され、より知覚しやすくなる。
（実施形態２）
実施形態２は、第一の画素１０及び第二の画素２０において、絵素の並び順を変えた以外は、実施形態１と同様である。図４は、実施形態２の液晶表示装置のアレイ基板を模式的に示した平面図である。実施形態２の液晶表示装置１００Ｂでは、第一の画素１０及び第二の画素２０において、赤絵素Ｒ、緑絵素Ｇ、青絵素Ｂは、第一の駆動信号線６１及び第二の駆動信号線６２が伸びる方向に沿って、ゲートドライバ７０側から、青絵素Ｂ、緑絵素Ｇ、赤絵素Ｒの並び順で配置される。そのため、各絵素電極は、各絵素に対応して、図４に示したように、第一の駆動信号線６１及び第二の駆動信号線６２が伸びる方向に沿って、ゲートドライバ７０側から、青絵素絵素電極５１Ｂ、緑絵素絵素電極５１Ｇ、赤絵素電極５１Ｒの並び順で配置される。実施形態２でも、実施形態１と同様に、消費電力を増加させることなく、色ずれの発生を抑制し、表示品位の優れた液晶表示装置を得ることができる。
（実施形態３）
実施形態３は、第一の駆動信号線６１及び第二の駆動信号線６２が、ソース信号線である点、赤色のカラーフィルタ３１Ｒ、緑色のカラーフィルタ３１Ｇ及び青色のカラーフィルタ３１Ｂが、互いに平行に行方向に伸びている点、第一の駆動信号線６１、及び、第二の駆動信号線６２が、互いに平行に列方向に伸びている点以外は、実施形態１と同様である。
図５は、実施形態３の液晶表示装置のアレイ基板を模式的に示した平面図である。実施形態３の液晶表示装置１００Ｃでは、第一の駆動信号線６１及び第二の駆動信号線６２は、ソース信号線であり、上記ソース信号線に階調信号を印加するソースドライバ８０に接続されている。図５に示したように、同一列上に配列した絵素電極は、ソース信号線である第一の駆動信号線６１及び第二の駆動信号線６２に接続されている。図示はしていないが、同一行上に配列した絵素電極は、一本のゲート信号線に接続され、それぞれの絵素電極は、ＴＦＴを介してソース信号線とゲート信号線とに接続されている。このような構成とすることで、疑似ドット反転駆動とし消費電力を抑えることができる。また、実施形態３では、第一の駆動信号線６１は、第一の駆動信号線６１を挟んで配列した第一列目の絵素電極群及び第二列目の絵素電極群に接続され、かつ、上記第一列目の絵素電極群の連続する三つの絵素電極と、上記第二列目の絵素電極群の連続する三つの絵素電極とに交互に接続される。第二の駆動信号線６２も同様に、上記第一列目の絵素電極群の連続する三つの絵素電極と、上記第二列目の絵素電極群の連続する三つの絵素電極とに交互に接続される。
実施形態３では、赤色のカラーフィルタ３１Ｒ、緑色のカラーフィルタ３１Ｇ及び青色のカラーフィルタ３１Ｂは、互いに平行に行方向に伸び、第一の駆動信号線６１、及び、第二の駆動信号線６２は、互いに平行に列方向に伸び、上記列方向及び上記行方向に沿って、第一の画素１０と第二の画素１０が交互に配置されている。更に、第一の駆動信号線６１、及び、第二の駆動信号線６２は、交互に配置されている。また、第一の画素１０及び第二の画素２０において、赤絵素Ｒ、緑絵素Ｇ、青絵素Ｂは、第一の駆動信号線６１及び第二の駆動信号線６２が伸びる方向に沿って、ソースドライバ８０側から、赤絵素Ｒ、緑絵素Ｇ、青絵素Ｂの並び順で配置される。そのため、各絵素電極は、各絵素に対応して、図５に示したように、第一の駆動信号線６１及び第二の駆動信号線６２が伸びる方向に沿って、ソースドライバ８０側から、赤絵素電極５１Ｒ、緑絵素絵素電極５１Ｇ、青絵素絵素電極５１Ｂの並び順で配置される。実施形態３でも、実施形態１と同様に、消費電力を増加させることなく、色ずれの発生を抑制し、表示品位の優れた液晶表示装置を得ることができる。
（実施形態４）
実施形態４は、第一の画素１０及び第二の画素２０において、絵素の並び順を変えた以外は、実施形態３と同様である。図６は、実施形態４の液晶表示装置のアレイ基板を模式的に示した平面図である。実施形態４の液晶表示装置１００Ｄでは、第一の画素１０及び第二の画素２０において、赤絵素Ｒ、緑絵素Ｇ、青絵素Ｂは、第一の駆動信号線６１及び第二の駆動信号線６２が伸びる方向に沿って、ソースドライバ８０側から、青絵素Ｂ、緑絵素Ｇ、赤絵素Ｒの並び順で配置される。そのため、各絵素電極は、各絵素に対応して、図６に示したように、第一の駆動信号線６１及び第二の駆動信号線６２が伸びる方向に沿って、ソースドライバ８０側から、青絵素絵素電極５１Ｂ、緑絵素絵素電極５１Ｇ、赤絵素電極５１Ｒの並び順で配置される。実施形態４でも、実施形態１と同様に、消費電力を増加させることなく、色ずれの発生を抑制し、表示品位の優れた液晶表示装置を得ることができる。 
［付記］
本発明の一態様は、赤絵素、緑絵素及び青絵素を含む第一の画素及び第二の画素が表示面に配列された液晶表示装置であって、カラーフィルタ基板と、液晶層と、アレイ基板とを順に有し、上記カラーフィルタ基板は、赤色のカラーフィルタ、緑色のカラーフィルタ及び青色のカラーフィルタを有し、上記アレイ基板は、上記液晶層を挟んで上記赤色のカラーフィルタに対向して配置された赤絵素電極と、上記液晶層を挟んで上記緑色のカラーフィルタに対向して配置された緑絵素電極と、上記液晶層を挟んで上記青色のカラーフィルタに対向して配置された青絵素電極と、上記第一の画素を構成する上記赤絵素電極及び上記緑絵素電極と、上記第二の画素を構成する上記青絵素電極とに接続された第一の駆動信号線と、上記第一の画素を構成する上記青絵素電極と、上記第二の画素を構成する上記赤絵素電極及び上記緑絵素電極に接続された第二の駆動信号線とを有し、上記第一の画素及び上記第二の画素に対して、上記赤絵素電極及び上記緑絵素電極に印加される電圧が同極性であり、上記緑絵素電極及び上記青絵素電極に印加される電圧が逆極性となるように交流電圧駆動が行われる液晶表示装置であってもよい。
上記第一の画素及び上記第二の画素において、上記緑絵素は、上記赤絵素と上記青絵素の間に配置されてもよい。
上記赤色のカラーフィルタ、上記緑色のカラーフィルタ及び上記青色のカラーフィルタは、互いに平行に列方向に伸び、上記第一の駆動信号線、及び、上記第二の駆動信号線は、互いに平行に行方向に伸び、上記列方向及び上記行方向に沿って、上記第一の画素と上記第二の画素が交互に配置されてもよい。なお、上記列方向は、上記赤色のカラーフィルタ、上記緑色のカラーフィルタ及び上記青色のカラーフィルタが互いに平行に伸びる方向であれば特に限定されない。したがって、上記赤色のカラーフィルタ、上記緑色のカラーフィルタ及び上記青色のカラーフィルタが互いに平行に伸びる方向を行方向と定義し直した場合には、上記赤色のカラーフィルタ、上記緑色のカラーフィルタ及び上記青色のカラーフィルタは、互いに平行に行方向に伸び、上記第一の駆動信号線、及び、上記第二の駆動信号線は、互いに平行に列方向に伸び、上記列方向及び上記行方向に沿って、上記第一の画素と上記第二の画素が交互に配置されると言い換えてもよい。
上記第一の駆動信号線及び第二の駆動信号線は、ゲート信号線であり、上記ゲート信号線に走査信号を印加するゲートドライバに接続されてもよい。
上記第一の駆動信号線及び第二の駆動信号線は、ソース信号線であり、上記ソース信号線に階調信号を印加するソースドライバに接続されてもよい。
以上に示した本発明の各態様は、本発明の要旨を逸脱しない範囲において適宜組み合わされてもよい。
１０：第一の画素
２０：第二の画素
３０：カラーフィルタ基板
４０：液晶層
５０：アレイ基板
３１Ｒ：赤色のカラーフィルタ
３１Ｇ：緑色のカラーフィルタ
３１Ｂ：青色のカラーフィルタ
５１Ｒ、２５１Ｒ：赤絵素電極
５１Ｇ、２５１Ｇ：緑絵素電極
５１Ｂ、２５１Ｂ：青絵素電極
６１：第一の駆動信号線
６２：第二の駆動信号線
７０、２７０：ゲートドライバ
８０：ソースドライバ
１００Ａ：実施形態１の液晶表示装置
１００Ｂ：実施形態２の液晶表示装置
１００Ｃ：実施形態３の液晶表示装置
１００Ｄ：実施形態４の液晶表示装置
２００：比較形態１の液晶表示装置
２６０：ゲート信号線
３００：特許文献３の液晶表示パネル
Ｂ：青絵素
Ｇ：緑絵素
Ｒ：赤絵素

 

Claims (5)

  1. 赤絵素、緑絵素及び青絵素を含む第一の画素及び第二の画素が表示面に配列された液晶表示装置であって、
    カラーフィルタ基板と、
    液晶層と、
    アレイ基板とを順に有し、
    前記カラーフィルタ基板は、赤色のカラーフィルタ、緑色のカラーフィルタ及び青色のカラーフィルタを有し、
    前記アレイ基板は、
    前記液晶層を挟んで前記赤色のカラーフィルタに対向して配置された赤絵素電極と、
    前記液晶層を挟んで前記緑色のカラーフィルタに対向して配置された緑絵素電極と、
    前記液晶層を挟んで前記青色のカラーフィルタに対向して配置された青絵素電極と、
    前記第一の画素を構成する前記赤絵素電極及び前記緑絵素電極と、前記第二の画素を構成する前記青絵素電極とに接続された第一の駆動信号線と、
    前記第一の画素を構成する前記青絵素電極と、前記第二の画素を構成する前記赤絵素電極及び前記緑絵素電極に接続された第二の駆動信号線とを有し、
    前記第一の画素及び前記第二の画素に対して、前記赤絵素電極及び前記緑絵素電極に印加される電圧が同極性であり、前記緑絵素電極及び前記青絵素電極に印加される電圧が逆極性となるように交流電圧駆動が行われることを特徴とする液晶表示装置。
  2. 前記第一の画素及び前記第二の画素において、前記緑絵素は、前記赤絵素と前記青絵素の間に配置されることを特徴とする請求項１に記載の液晶表示装置。
  3. 前記赤色のカラーフィルタ、前記緑色のカラーフィルタ及び前記青色のカラーフィルタは、互いに平行に列方向に伸び、
    前記第一の駆動信号線、及び、前記第二の駆動信号線は、互いに平行に行方向に伸び、
    前記列方向及び前記行方向に沿って、前記第一の画素と前記第二の画素が交互に配置されたことを特徴とする請求項１又は２に記載の液晶表示装置。
  4. 前記第一の駆動信号線及び第二の駆動信号線は、ゲート信号線であり、
    前記ゲート信号線に走査信号を印加するゲートドライバに接続されることを特徴とする請求項１～３のいずれかに記載の液晶表示装置。
  5. 前記第一の駆動信号線及び第二の駆動信号線は、ソース信号線であり、
    前記ソース信号線に階調信号を印加するソースドライバに接続されることを特徴とする請求項１～３のいずれかに記載の液晶表示装置。
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