WO2012093630A1 - Dispositif d'affichage à cristaux liquides - Google Patents

Dispositif d'affichage à cristaux liquides Download PDF

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WO2012093630A1
WO2012093630A1 PCT/JP2011/080368 JP2011080368W WO2012093630A1 WO 2012093630 A1 WO2012093630 A1 WO 2012093630A1 JP 2011080368 W JP2011080368 W JP 2011080368W WO 2012093630 A1 WO2012093630 A1 WO 2012093630A1
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pixel
subpixel
color display
liquid crystal
pixels
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PCT/JP2011/080368
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English (en)
Japanese (ja)
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壮寿 吉田
下敷領　文一
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シャープ株式会社
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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
    • G09G3/3607—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 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0439—Pixel structures
    • G09G2300/0443—Pixel structures with several sub-pixels for the same colour in a pixel, not specifically used to display gradations
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • 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
    • G09G3/2007—Display of intermediate tones
    • G09G3/2074—Display of intermediate tones using sub-pixels

Definitions

  • the present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device having a multi-pixel structure.
  • the liquid crystal display device is a flat display device having excellent features such as high definition, thinness, light weight and low power consumption.
  • the display performance has been improved, the production capacity has been improved, and the price competitiveness with respect to other display devices has been improved.
  • the market scale is expanding rapidly.
  • a conventional twisted nematic mode (TN mode) liquid crystal display device the major axis of liquid crystal molecules having positive dielectric anisotropy is substantially parallel to the substrate surface, and the liquid crystal layer The alignment treatment is performed so that the substrate is twisted approximately 90 degrees between the upper and lower substrates along the thickness direction.
  • a voltage is applied to the liquid crystal layer, the liquid crystal molecules rise in parallel with the electric field, and the twist alignment (twist alignment) is eliminated.
  • the amount of transmitted light is controlled by utilizing a change in optical rotation accompanying a change in the orientation of liquid crystal molecules due to a voltage.
  • Such a TN mode liquid crystal display device has a wide production margin and excellent productivity, but has a problem in display performance, particularly viewing angle characteristics. Specifically, when the display surface of a TN mode liquid crystal display device is observed from an oblique direction, the contrast ratio of the display is significantly reduced, and a plurality of gradations from black to white are clearly observed when observed from the front. When the image is observed from an oblique direction, the problem is that the luminance difference between gradations becomes extremely unclear. Furthermore, the phenomenon that the gradation characteristics of the display are reversed and a darker portion when observed from the front is observed brighter when observed from an oblique direction (so-called gradation inversion phenomenon) is also a problem.
  • liquid crystal display devices with improved viewing angle characteristics in TN mode liquid crystal display devices include in-plane switching mode (IPS mode), multi-domain vertical aligned mode (MVA mode), and axially symmetric alignment mode (ASM). Mode) and the like have been developed.
  • IPS mode in-plane switching mode
  • MVA mode multi-domain vertical aligned mode
  • ASM axially symmetric alignment mode
  • the above-mentioned specific problems related to viewing angle characteristics that is, a significant reduction in display contrast ratio when the display surface is observed obliquely, and Problems such as display gradation inversion have been solved.
  • the problem of viewing angle characteristics is that the ⁇ characteristics during frontal observation and the ⁇ characteristics during oblique observation differ, that is, the dependence of ⁇ characteristics on the viewing angle.
  • sexual problems are newly emerging.
  • the ⁇ characteristic is the gradation dependence of display luminance.
  • the gradation display state differs depending on the observation direction. This is particularly problematic when displaying images such as photographs or when displaying TV broadcasts.
  • two or more subpixels are provided in one pixel, and the luminance of one subpixel is different from the other in the intermediate luminance display.
  • Methods for improving the viewing angle dependency are known (see, for example, Patent Documents 1 and 2). Note that a structure in which each pixel has two or more sub-pixels is also called a multi-pixel structure.
  • FIG. 23 shows a schematic diagram of a liquid crystal display device 900 disclosed in Patent Document 1.
  • the subpixel electrodes 914a and 914b are connected to the common source line S via the corresponding TFTs 916a and 916b, and form capacitive coupling with the corresponding auxiliary capacitance lines CCSa and CCSb.
  • the potentials of the subpixel electrodes 914a and 914b change to change each subpixel. As a result, the viewing angle characteristic is improved.
  • the source signal is supplied from the common source line S to the sub-pixel electrodes 914a and 914b in the same pixel, a decrease in the aperture ratio is suppressed.
  • Patent Document 2 mentions a color balance shift in a multi-pixel structure.
  • the voltage difference between the effective voltages of the two subpixels of the blue pixel and / or the cyan pixel is made smaller than the voltage difference of the effective voltages of the two subpixels of the other pixels. Suppresses yellow shift in viewing angle.
  • the suppression effect of whitening can be adjusted by changing the amplitude of the CS signal.
  • the whitening suppression effect can be increased.
  • the display quality from an oblique direction may deteriorate.
  • the present invention has been made in view of the above problems, and an object thereof is to provide a liquid crystal display device having improved display quality in an oblique direction.
  • a liquid crystal display device is a liquid crystal display device including a plurality of color display pixels including a first color display pixel and a second color display pixel, and each of the plurality of color display pixels is a first color display pixel.
  • a plurality of pixels including a pixel, a second pixel, and a third pixel; each of the plurality of pixels includes a first subpixel and a second subpixel; and each of the plurality of color display pixels
  • each of the first subpixel and the second subpixel is formed by a counter electrode, a liquid crystal layer, and a subpixel electrode facing the counter electrode via the liquid crystal layer.
  • the first color of the first color display pixel and the first pixel of the second color display pixel each perform display with at least some intermediate gradation.
  • the voltage difference between the effective voltage of the first sub-pixel and the effective voltage of the second sub-pixel in the first pixel of the display pixel is the effective voltage of the first sub-pixel in the first pixel of the second color display pixel. It is different from the voltage difference between the voltage and the effective voltage of the second subpixel.
  • the capacitance value of the auxiliary capacitance of the first subpixel is approximately equal to the capacitance value of the auxiliary capacitance of the second subpixel. equal.
  • the amplitude of the auxiliary capacitance signal supplied to the auxiliary capacitance counter electrode corresponding to the first subpixel is the second subpixel. Is substantially equal to the amplitude of the auxiliary capacitance signal supplied to the auxiliary capacitance counter electrode.
  • the first color display pixel of the first color display pixel when each of the first pixel of the first color display pixel and the first pixel of the second color display pixel performs display with at least some intermediate gradation, the first color display pixel of the first color display pixel Write voltages to the subpixel electrodes corresponding to the first subpixel and the second subpixel in the first pixel are the first subpixel and the second subpixel in the first pixel of the second color display pixel. This is different from the write voltage to the subpixel electrode corresponding to.
  • the amplitude of the auxiliary capacitance signal supplied to the auxiliary capacitance counter electrode corresponding to the first subpixel and the second subpixel in the first pixel of the first color display pixel is the second color.
  • the amplitude of the auxiliary capacitance signal supplied to the auxiliary capacitance counter electrode corresponding to the first subpixel and the second subpixel in the first pixel of the display pixel is different.
  • the capacitance value of the auxiliary capacitance of the first subpixel and the second subpixel in the first pixel of the first color display pixel is equal to the capacity value of the first pixel of the second color display pixel.
  • the capacitance values of the auxiliary capacitors of one subpixel and the second subpixel are substantially equal.
  • the capacitance value of the auxiliary capacitance of the first subpixel and the second subpixel in the first pixel of the first color display pixel is equal to the capacity value of the first pixel of the second color display pixel. It differs from the capacitance value of the auxiliary capacitance of one subpixel and the second subpixel.
  • the amplitude of the auxiliary capacitance signal supplied to the auxiliary capacitance counter electrode corresponding to the first subpixel and the second subpixel in the first pixel of the first color display pixel is the second color.
  • the amplitude of the auxiliary capacitance signal supplied to the auxiliary capacitance counter electrode corresponding to the first subpixel and the second subpixel in the first pixel of the display pixel is substantially equal.
  • the capacitance value of the auxiliary capacitance of the first subpixel and the second subpixel in the first pixel of the first color display pixel is equal to the capacity value of the first pixel of the second color display pixel.
  • the auxiliary capacitance counter electrode corresponding to the first subpixel and the second subpixel in the first pixel of the first color display pixel is supplied.
  • the amplitude of the auxiliary capacitance signal is different from the amplitude of the auxiliary capacitance signal supplied to the auxiliary capacitance counter electrode corresponding to the first subpixel and the second subpixel in the first pixel of the second color display pixel.
  • the first subpixel in each of the plurality of pixels of the first color display pixel when each of the plurality of pixels of the first color display pixel performs display at the at least certain intermediate gradation, the first subpixel in each of the plurality of pixels of the first color display pixel. And the voltage difference between the effective voltage of the second subpixel and the effective voltage of the second subpixel are substantially equal to each other.
  • the first subpixel in each of the plurality of pixels of the first color display pixel when each of the plurality of pixels of the first color display pixel performs display at the at least certain intermediate gradation, the first subpixel in each of the plurality of pixels of the first color display pixel.
  • the average effective voltages of the second subpixels are substantially equal to each other.
  • the amplitudes of the auxiliary capacitance signals supplied to the auxiliary capacitance counter electrodes corresponding to the first subpixel and the second subpixel in each of the plurality of pixels of the first color display pixel are substantially equal to each other. .
  • the capacitance values of the auxiliary capacitors of the first subpixel and the second subpixel in each of the plurality of pixels of the first color display pixel are substantially equal to each other.
  • the first pixel in the first pixel of the first color display pixel when each of the first pixel and the third pixel of the first color display pixel performs display at the intermediate gray level, the first pixel in the first pixel of the first color display pixel.
  • the voltage difference between the effective voltage of one subpixel and the effective voltage of the second subpixel is the effective voltage of the first subpixel and the effective voltage of the second subpixel in the third pixel of the first color display pixel. And the voltage difference is different.
  • the amplitude of the auxiliary capacitance signal supplied to the auxiliary capacitance counter electrode corresponding to the first subpixel and the second subpixel in the first pixel of the first color display pixel is the first color.
  • the amplitude of the auxiliary capacitance signal supplied to the auxiliary capacitance counter electrode corresponding to the first subpixel and the second subpixel in the third pixel of the display pixel is different.
  • the capacitance value of the auxiliary capacitance of the first sub-pixel and the second sub-pixel in the first pixel of the first color display pixel is equal to the capacity value of the third pixel of the first color display pixel. This is different from the capacitance value of the auxiliary capacitance of one subpixel and the second subpixel.
  • the first pixel, the second pixel, and the third pixel are a red pixel, a green pixel, and a blue pixel, respectively.
  • the plurality of color display pixels are arranged in a matrix of a plurality of rows and a plurality of columns, and the second color display pixels are arranged in a row direction or a column direction with respect to the first color display pixels. Adjacent.
  • the liquid crystal display device can improve the display quality in the oblique direction.
  • FIG. 4 is an equivalent circuit diagram of one pixel in the liquid crystal display device of the present embodiment. It is a signal waveform diagram in the liquid crystal display device of this embodiment. It is a schematic diagram which shows the voltage difference of the effective voltage of four color display pixels and the sub pixel in each pixel in the liquid crystal display device of this embodiment.
  • (A) is a schematic diagram of the liquid crystal display device of a comparative example
  • (b) is a schematic diagram of four color display pixels in the liquid crystal display device of the comparative example.
  • FIG. 1 It is a schematic diagram which shows the voltage difference of the effective voltage of four color display pixels and the sub pixel in each pixel in the liquid crystal display device of this embodiment. It is a schematic diagram which shows the voltage difference of the effective voltage of four color display pixels and the sub pixel in each pixel in the liquid crystal display device of this embodiment. It is a schematic diagram which shows the effective voltage difference of four color display pixels and each pixel in 2nd Embodiment of the liquid crystal display device by this invention. It is a schematic diagram which shows the full width of four color display pixels in the liquid crystal display device of a comparative example, and the CS signal corresponding to the auxiliary capacity of each pixel.
  • FIG. 1 shows the voltage difference of the effective voltage of four color display pixels and the sub pixel in each pixel in the liquid crystal display device of this embodiment. It is a schematic diagram which shows the voltage difference of the effective voltage of four color display pixels and the sub pixel in each pixel in the liquid crystal display device of this embodiment. It is a schematic diagram which shows the effective voltage difference of
  • 16A is a graph showing changes in chromaticity u ′ with respect to gradation changes in the liquid crystal display device shown in FIG. 16, and FIG. 16B is a graph showing changes in chromaticity v ′ with changes in gradation. It is a schematic diagram which shows the full width of four color display pixels in the liquid crystal display device of a comparative example, and the CS signal corresponding to the auxiliary capacity of each pixel.
  • 18A is a graph showing changes in chromaticity u ′ with respect to gradation changes in the liquid crystal display device shown in FIG. 18, and FIG. 18B is a graph showing changes in chromaticity v ′ with changes in gradation.
  • FIG. 20A is a graph showing changes in chromaticity u ′ with respect to gradation changes in the liquid crystal display device shown in FIG. 20, and FIG. 20B is a graph showing changes in chromaticity v ′ with changes in gradation.
  • FIG. 20B is a graph showing changes in chromaticity v ′ with changes in gradation.
  • It is a schematic diagram which shows ratio of the capacitance value of four color display pixels and the auxiliary capacitance of each pixel in the liquid crystal display device of this embodiment.
  • FIG. 1A shows a schematic diagram of a liquid crystal display device 100 of the present embodiment.
  • the liquid crystal display device 100 includes a rear substrate 10, a front substrate 20, and a liquid crystal layer 30 provided between the rear substrate 10 and the front substrate 20.
  • the back substrate 10 has an insulating substrate 12 and pixel electrodes 14.
  • the front substrate 20 has an insulating substrate 22 and a counter electrode 24.
  • the back substrate 10 includes a source line, an insulating layer, a gate line, a switching element (typically, a thin film transistor (TFT)) and an alignment film.
  • the front substrate 20 is provided with a color filter layer, an alignment film, and the like.
  • a polarizing plate is provided outside the rear substrate 10 and the front substrate 20.
  • the liquid crystal display device 100 is in a VA (Vertical Alignment) mode.
  • the liquid crystal display device 100 may be in an MVA (Multi-domain Vertical Alignment) mode, a PVA (Patterned Vertical Alignment) mode, or a CPA (Continuous Pinweal Alignment) mode, or an RTN (Welte Current). It may be a mode.
  • the RTN mode may specifically be a UV 2 A (Ultraviolet-induced multi-domain Vertical Alignment) mode.
  • the liquid crystal layer 30 is a vertical alignment type liquid crystal layer
  • the alignment film is a vertical alignment film.
  • the “vertical alignment type liquid crystal layer” refers to a liquid crystal layer in which a liquid crystal molecular axis (also referred to as “axis orientation”) is aligned at an angle of about 85 ° or more with respect to the surface of the vertical alignment film.
  • display is performed in a normally black mode by combining the liquid crystal layer 30 and a polarizing plate arranged in crossed Nicols.
  • the liquid crystal display device 100 may be in a TN (Twisted Nematic) mode.
  • the liquid crystal display device 100 may be a transmissive type or a reflective type.
  • the liquid crystal display device 100 may be a transmission / reflection type.
  • the liquid crystal display device 100 further includes a backlight.
  • the liquid crystal display device 100 is provided with a plurality of color display pixels.
  • the color display pixel functions as a display unit of an arbitrary color.
  • the color display pixel has three or more pixels. For example, when red, green, and blue are used as primary colors, the color display pixel has a red pixel, a green pixel, and a blue pixel.
  • Each pixel is defined by a pixel electrode 14.
  • the counter electrode 24 is typically provided so as to oppose all the pixel electrodes 14, but may be provided by being divided into a plurality of blocks.
  • FIG. 1B shows a schematic diagram of four color display pixels D in the liquid crystal display device 100.
  • a plurality of color display pixels are arranged in a matrix of a plurality of rows and a plurality of columns.
  • FIG. 1B shows four color display pixels D 1 to D 4 . .
  • the color display pixels D 1 and D 2 are adjacent in the row direction (x direction), and the color display pixels D 3 and D 4 are adjacent in the row direction.
  • the color display pixels D 1 and D 3 are adjacent to each other in the column direction (y direction), and the color display pixels D 2 and D 4 are adjacent to each other in the column direction.
  • Each color display pixel D has a plurality of pixels.
  • the plurality of pixels include a red pixel R, a green pixel G, and a blue pixel B.
  • the red pixel, the green pixel, and the blue pixel of the color display pixel D 1 may be referred to as a red pixel R 1 , a green pixel G 1, and a blue pixel B 1 .
  • red pixels are red pixels R 2 , R 3 , R 4
  • green pixels are green pixels G 2 , G 3 , G 4
  • blue pixels are blue pixels.
  • B 2 , B 3 , and B 4 may be indicated respectively.
  • Each pixel R, G, B has a sub-pixel a and a sub-pixel b.
  • the sub-pixel a and the sub-pixel b have substantially the same area, and the sub-pixel a and the sub-pixel b exhibit different luminances at least in a certain intermediate gradation.
  • the subpixels a and b may be referred to as a first subpixel and a second subpixel, respectively.
  • the sub-pixel b of the blue pixel B 1 may be denoted as sub-pixels R 1b , G 1b and B 1b , respectively.
  • FIG. 2 shows an equivalent circuit of one pixel of the liquid crystal display device 100.
  • the liquid crystal layers 30 corresponding to the sub-pixels a and b are represented as liquid crystal layers 30a and 30b.
  • the pixel electrode 14 is separated into subpixel electrodes 14a and 14b, while the counter electrode 24 is typically common to both subpixels a and b.
  • the liquid crystal capacitor CLa of the subpixel a is formed by the subpixel electrode 14a, the counter electrode 24, and the liquid crystal layer 30a
  • the liquid crystal capacitor CLb of the subpixel b is formed of the subpixel electrode 14b, the counter electrode 24, and the liquid crystal layer. 30b.
  • CL (V) depends on the effective voltage V applied to the liquid crystal layers 30a and 30b.
  • the auxiliary capacitor CSa of the subpixel a is formed by an auxiliary capacitor electrode, an auxiliary capacitor counter electrode, and an insulating layer
  • the auxiliary capacitor CSb of the subpixel b is formed of an auxiliary capacitor electrode, an auxiliary capacitor counter electrode, and an insulating layer. Formed by.
  • the capacitance values of the auxiliary capacitors CSa and CSb are the same value, and this value is represented as CCS.
  • each of the liquid crystal capacitor CLa and the auxiliary capacitor CSa is connected to the drain of the TFT 16a functioning as a switching element of the subpixel a, and the other electrode of the liquid crystal capacitor CLa is connected to the counter electrode 24.
  • the other electrode of the auxiliary capacitor CSa is connected to the auxiliary capacitor line (CS line) CCSa.
  • one electrode of each of the liquid crystal capacitor CLb and the auxiliary capacitor CSb is connected to the drain of the TFT 16b functioning as a switching element of the sub-pixel b, and the other electrode of the liquid crystal capacitor CLb is the counter electrode 24.
  • the other electrode of the auxiliary capacitor CSb is connected to an auxiliary capacitor line (CS line) CCSb.
  • the gates of the TFTs 16 a and 16 b are both connected to the gate line G, and the sources are both connected to the source line S.
  • the thicknesses of the liquid crystal layers 30a and 30b of the sub-pixels a and b of the red pixel R, the green pixel G, and the blue pixel B are substantially constant unless otherwise specified.
  • the present invention is not limited to this.
  • FIG. 3 schematically shows changes in each voltage for driving the liquid crystal display device 100 of the present embodiment within a certain vertical scanning period.
  • Vs indicates the voltage of the source line S
  • Vcsa indicates the voltage of the CS line CCSa
  • Vcsb indicates the voltage of the CS line CCSb
  • Vg indicates the voltage of the gate line G
  • VLa indicates the subpixel electrode 14a
  • VLb indicates the voltage of the sub-pixel electrode 14b.
  • the broken line in the figure indicates the voltage COMMON (Vc) of the counter electrode 24.
  • the voltage Vcsa of the CS wiring CCSa periodically changes in the range from Vc ⁇ Vad to Vc + Vad
  • the voltage Vcsb of the CS wiring CCSb also periodically changes in the range of Vc ⁇ Vad to Vc + Vad.
  • the amplitude of the voltage Vcsb of the CS wiring CCSb is equal to the voltage Vcsa of the CS wiring CCSa
  • the phase of the voltage Vcsb of the CS wiring CCSb is 180 degrees different from the voltage Vcsa of the CS wiring CCSa.
  • the voltage Vg of the gate line G changes from VgL to VgH, so that the TFTs 16a and 16b are simultaneously turned on (on state), and the source line S is connected to the subpixel electrodes 14a and 14b of the subpixels a and b.
  • the voltage Vs is transmitted, and the liquid crystal capacitors CLa and CLb of the sub-pixels a and b are charged.
  • the auxiliary capacitors CSa and CSb of the respective sub-pixels are charged from the source line S.
  • the voltage Vs of the source line S at this time is also referred to as a write voltage.
  • the TFTs 16a and 16b are simultaneously turned off (off state), and the liquid crystal capacitors CLa and CLb of the sub-pixels a and b, the auxiliary The capacitors CSa and CSb are both electrically insulated from the source line S.
  • the voltage Vcsa of the CS wiring CCSa connected to the auxiliary capacitor CSa increases by 2 ⁇ Vad from Vc ⁇ Vad to Vc + Vad
  • the voltage Vcsb of the CS wiring CCSb connected to the auxiliary capacitor CSb increases from Vc + Vad to Vc ⁇ . Decrease to Vad by 2 ⁇ Vad.
  • VLb Vs ⁇ Vd ⁇ 2 ⁇ K ⁇ Vad
  • K CCS / (CL (V) + CCS).
  • Vcsa of the CS line CCSa changes from Vc + Vad to Vc ⁇ Vad
  • the voltage Vcsb of the CS line CCSb changes from Vc ⁇ Vad to Vc + Vad by 2 ⁇ Vad, thereby causing the subpixel electrodes 14a and 14b to change.
  • VLb Vs ⁇ Vd To change.
  • VLb Vs ⁇ Vd ⁇ 2 ⁇ K ⁇ Vad To change.
  • the effective voltages V1 and V2 applied to the liquid crystal layers 30a and 30b of the subpixels a and b are opposite to the difference between the voltage of the subpixel electrode 14a and the voltage of the counter electrode 24, and the voltage of the subpixel electrode 14b, respectively.
  • Difference from the voltage of the electrode 24, ie V1 VLa-Vcom
  • V2 Vs ⁇ Vd ⁇ K ⁇ Vad ⁇ Vcom It becomes.
  • K CCS / (CL (V ) + CCS)
  • ⁇ Vad K ⁇ ⁇ Vad
  • This ⁇ Vad is also called the peak-to-peak or full width of the CS signal.
  • the smaller the value of the voltage V1 the larger the value of ⁇ V.
  • ⁇ V changes depending on V1 or V2 because the capacitance value CL (V) of the liquid crystal capacitance changes depending on the voltage.
  • CL (V) the capacitance value of the liquid crystal capacitance changes depending on the voltage.
  • the voltage difference between the effective voltage of the sub-pixel a and the effective voltage of the sub-pixel b is varied according to the color display pixel D, thereby further improving the viewing angle characteristics. ing.
  • FIG. 4 shows the voltage difference between the effective voltage of the sub-pixel a and the effective voltage of the sub-pixel b in the color display pixels D 1 to D 4 and each pixel in the liquid crystal display device 100 of the present embodiment.
  • the colors displayed by the four color display pixels D 1 to D 4 in the input signal are equal to each other.
  • the red pixel R, the green pixel G, and the blue pixel B exhibit the same intermediate gradation, and for example, the color display pixels D 1 to D 4 exhibit an achromatic color.
  • the voltage difference between the effective voltage of the sub-pixel R 1a and the effective voltage of the sub-pixel R 1b is ⁇ V 1 .
  • the voltage difference between the effective voltage of the sub-pixel G 1a and the effective voltage of the sub-pixel G 1b in the green pixel G 1 is also ⁇ V 1
  • the effective voltage of the sub-pixel B 1a and the effective voltage of the sub-pixel B 1b in the blue pixel B 1 The voltage difference from the effective voltage is also ⁇ V 1 .
  • the voltage difference between the effective voltage of the sub-pixel R 2a and the effective voltage of the sub-pixel R 2b is ⁇ V 2 , and ⁇ V 2 is different from ⁇ V 1 .
  • the voltage difference between the effective voltage of the sub-pixel G 2a and the effective voltage of the sub-pixel G 2b in the green pixel G 2 is also ⁇ V 2
  • the effective voltage of the sub-pixel B 2a and the effective voltage of the sub-pixel B 2b in the blue pixel B 2 is also ⁇ V 2 .
  • the voltage difference between the effective voltage of the sub-pixel a and the effective voltage of the sub-pixel b is ⁇ V 2.
  • the voltage difference between the effective voltage of the sub-pixel a and the effective voltage of the sub-pixel b is ⁇ V 1 .
  • the color display pixel D in which the voltage difference between the effective voltages of the sub-pixels a and b is ⁇ V 1 is diagonally adjacent, and the voltage difference between the effective voltages of the sub-pixels a and b is ⁇ V 2.
  • the color display pixels D are adjacent obliquely.
  • the difference in effective voltage difference ⁇ V between the sub-pixels a and b in the adjacent color display pixels D improves the viewing angle characteristics effectively.
  • DerutaVad 1 is a potential change of color display pixels each pixel R 1 in D 1, G 1, sub-pixel B 1 a, b of the auxiliary capacitor CSa, CS signals corresponding to CSb (full width),
  • CCS 1 is subpixel a in the color display pixel D 1, b of the auxiliary capacitor CSa, a capacitance value of CSb.
  • ⁇ V 2 K 2 ⁇ ⁇ Vad 2 .
  • the CS signal potential change amount corresponding to the auxiliary capacitors CSa and CSb, and CCS 2 is the capacitance value of the auxiliary capacitors CSa and CSb of the sub-pixels a and b in the color display pixel D 2 .
  • each pixel of the color display pixel D 1, D 2 R, subpixel a G and B, b of the auxiliary capacitance CSa by varying the capacitance values CCS 1, CCS 2 of CSb, color display
  • the voltage difference ⁇ V between the effective voltages of the sub-pixels a and b can be made different.
  • the overlapping area of the auxiliary capacitance electrodes and auxiliary capacitance counter electrodes forming the auxiliary capacitances CSa and CSb of the sub-pixels a and b of the red pixel R, the green pixel G, and the blue pixel B is defined in the color display pixel D. It may be different depending on the situation.
  • the values of K 1 and K 2 may be made different by making the liquid crystal capacitance CL different by changing the gap (thickness) of the liquid crystal layer according to the color display pixel D.
  • Amplitudes Vad 1 and Vad 2 (or potential change amounts ⁇ Vad 1 and ⁇ Vad 2 ) may be made different according to the color display pixels D 1 and D 2 .
  • the amplitudes Vad 1 and Vad 2 (or potential change amounts ⁇ Vad 1 and ⁇ Vad 2 ) of the auxiliary capacitance signal (CS signal) may be made different.
  • the diagonal ⁇ characteristics of the pixels displaying this color can be changed not only in the sub-pixel unit but also in the pixel unit.
  • the viewing angle characteristics can be improved.
  • the magnitude relationship between the potentials of the pixel electrode 14 and the counter electrode 24 among the voltages applied to the liquid crystal layer 30 is inverted at regular intervals, and the liquid crystal display device 100 is liquid crystal.
  • the direction of the electric field applied to the layer 30 (the direction of the electric lines of force) is set so as to be reversed at regular intervals.
  • the direction of the electric field is also called polarity. For example, when focusing on a certain pixel, after writing is performed so that the potential of the pixel electrode 14 is higher than that of the counter electrode 24 in a certain vertical scanning period, the potential of the counter electrode 24 is changed in another vertical scanning period. Writing is performed so as to be higher than the pixel electrode 14. Typically, the pixel writing polarity is inverted every vertical scanning period.
  • pixels having one polarity are arranged in a checkered pattern, and pixels having the other polarity are also arranged in a checkered pattern.
  • pixels having the other polarity are also arranged in a checkered pattern.
  • the bright subpixels are arranged in a checkered pattern. Note that the brightness of the sub-pixels may be inverted within the same pixel.
  • FIG. 5A shows a schematic diagram of the liquid crystal display device 800.
  • the liquid crystal display device 800 includes a rear substrate 810, a front substrate 820, and a liquid crystal layer 830 provided between the rear substrate 810 and the front substrate 820.
  • the back substrate 810 includes an insulating substrate 812 and pixel electrodes 814.
  • the front substrate 820 includes an insulating substrate 822 and a counter electrode 824.
  • FIG. 5B shows a schematic diagram of four color display pixels D 1 to D 4 in the liquid crystal display device 800. Again, the colors displayed by the four color display pixels D 1 to D 4 in the input signal are equal to each other. In each of the color display pixels D 1 to D 4 , the red pixel R, the green pixel G, and the blue pixel B exhibit the same intermediate gradation, and the color display pixels D 1 to D 4 exhibit an achromatic color.
  • the voltage difference between the effective voltage of the sub-pixel R 1a and the effective voltage of the sub-pixel R 1b in the red pixel R 1 of the color display pixel D 1 is ⁇ Vc.
  • the voltage difference between the effective voltage of the sub-pixel G 1a and the effective voltage of the sub-pixel G 1b in the green pixel G 1 is also ⁇ Vc, and the effective voltage of the sub-pixel B 1a and the effective voltage of the sub-pixel B 1b in the blue pixel B 1 .
  • the voltage difference from the voltage is also ⁇ Vc.
  • the voltage difference between the effective voltage of the subpixel a and the effective voltage of the subpixel b is also ⁇ Vc.
  • the voltage difference ⁇ Vc between the effective voltages of the sub-pixels a and b is constant in the color display pixels D 1 to D 4 , the viewing angle characteristics are not sufficiently improved.
  • FIG. 6 shows a graph showing the viewing angle characteristics of the liquid crystal display device 800.
  • the amplitude (full width) of the CS signal is changed, and the full width of the CS signal is one of 0V, 2.0V, 3.0V, and 4.0V.
  • the number of gradations of each pixel is 255.
  • gradations 0 to 255 are proportional to the front normalized luminance. is doing.
  • the liquid crystal display device 800 is in the 4DRTN mode.
  • the full width of the CS signal is 2.0 V
  • the difference between the 45 ° viewing angle normalized luminance and the front normalized luminance becomes small.
  • the 45 ° viewing angle normalized luminance is close to the front normalized luminance over the gradations 20 to 160, thereby suppressing whitening.
  • the difference between the 45 ° viewing angle normalized luminance and the front normalized luminance is smaller than that when the total width is 2.0 V, and in particular, 45 degrees over gradations 100 to 160.
  • the viewing angle normalized luminance is closer to the front normalized luminance.
  • the total width of the CS signal is 4.0 V
  • the difference between the 45 ° viewing angle normalized luminance and the front normalized luminance is further reduced as compared with the case where the total width is 3.0 V, and the 45 tones in the gradations 130 to 160 are 45.
  • the degree viewing angle normalized luminance is closer to the front normalized luminance.
  • the 45 ° viewing angle normalized luminance tends to approach the front normalized luminance, thereby suppressing whitening.
  • the 45 ° viewing angle normalized luminance change with respect to the gradation change (that is, the gradation change from the 45 ° viewing angle direction). ) Focus on itself.
  • the variation of the change rate of 45 degree viewing angle normalized luminance with respect to the gradation change when the CS signal full width is 2.0V is relatively small, the 45 degree viewing angle with respect to the gradation change when the CS signal full width is 3.0V.
  • the variation of the change rate of the normalized luminance is larger than that when the full width of the CS signal is 2.0V.
  • the variation in the change rate of the 45-degree viewing angle normalized luminance with respect to the gradation change when the full width of the CS signal is 4.0V is larger than that when the full width of the CS signal is 3.0V.
  • the change rate of the normalized luminance in the oblique direction with respect to the gradation change may fluctuate greatly, and the display quality may be deteriorated.
  • luminance of the diagonal direction is suppressed, and the fall of display quality is suppressed.
  • FIG. 7 shows a graph showing the viewing angle characteristics of the liquid crystal display device 100.
  • gradations 0 to 255 are proportional to the front normalized luminance.
  • the liquid crystal display device 100 is in the 4DRTN mode.
  • the auxiliary capacitors CSa and CSb of the sub-pixels a and b of the pixels R, G, and B in each color display pixel D are substantially constant, but depending on the color display pixel D, the pixels R, G
  • the widths of the CS signals corresponding to the auxiliary capacitors CSa and CSb of the B subpixels a and b are different.
  • there are two types of CS signal full width one full width is 2.0V, and the other full width is 4.0V.
  • FIG. 7 shows a case where the full width of the CS signal in the liquid crystal display device 800 of the comparative example described above with reference to FIG. 6 is set to any one of 0V, 2.0V, 3.0V, and 4.0V.
  • the 45-degree viewing angle normalized luminance change is also shown.
  • the difference between the 45 ° viewing angle normalized luminance and the front normalized luminance is small compared to the case where the entire width of the CS signal in the liquid crystal display device 800 is 0V.
  • the 45-degree viewing angle normalized luminance is close to the front normalized luminance in the keys 100 to 160.
  • the difference between the 45 ° viewing angle normalized luminance and the front normalized luminance is small compared to the case where the entire width of the CS signal in the liquid crystal display device 800 is 2.0V, and the gradations 100 to 160 are small. Over 45 degrees, the viewing angle normalized luminance approaches the front normalized luminance.
  • the difference between the 45 ° viewing angle normalized luminance and the front normalized luminance is slightly larger than that in the liquid crystal display device 800 when the full width of the CS signal is 3.0V or 4.0V.
  • the variation in the change rate of the 45-degree viewing angle normalized luminance with respect to the gradation change over the gradations 100 to 160 is smaller than when the full width of the CS signal is 3.0V or 4.0V. This makes it possible to smoothly change the 45-degree viewing angle normalized luminance with respect to the gradation change.
  • the display quality in the oblique direction can be further improved by providing the color display pixels D having different voltage differences ⁇ V of the effective voltages of the sub-pixels a and b.
  • FIG. 8 is a graph showing the viewing angle characteristics of the liquid crystal display device 100.
  • the gradations 0 to 255 are proportional to the front normalized luminance.
  • the auxiliary capacitors CSa and CSb of the sub-pixels a and b of the pixels R, G and B in each color display pixel D are constant, but the pixels R, G, and B according to the color display pixel D are constant.
  • the full widths of the CS signals corresponding to the auxiliary capacitors CSa and CSb of the B subpixels a and b are different.
  • the liquid crystal display device 100 is in the 4DRTN mode.
  • the full width of the CS signal in the liquid crystal display device 800 of the comparative example described above with reference to FIG. 6 is changed to 2.0 V, 3.0 V, and 4.0 V (that is, CS It also shows the change in 60 ° viewing angle normalized luminance when the signal amplitude is changed at 1.0V, 1.5V, and 2.0V.
  • the full width of the CS signal when the full width of the CS signal is 3.0V, it is 60 degrees over the gradations 100 to 170, compared with the case where the full width of the CS signal is 2.0V.
  • the viewing angle normalized luminance is closer to the front normalized luminance.
  • the full width of the CS signal is 4.0 V
  • the 60-degree viewing angle normalized luminance is closer to the front normalized luminance over the gradations 130 to 170, compared to the case where the full width of the CS signal is 3.0 V.
  • the 60 ° viewing angle normalized luminance tends to approach the front normalized luminance, and whitening can be suppressed.
  • the change rate of the 60-degree viewing angle normalized brightness with respect to the gradation change greatly varies.
  • the variation in the rate of change of the 60 ° viewing angle normalized luminance with respect to the gradation change when the full width of the CS signal is 3.0V is larger than that when the full width of the CS signal is 2.0V.
  • the variation in the change rate of the 60 ° viewing angle normalized luminance with respect to the gradation change when the full width of the CS signal is 4.0V is larger than that when the full width of the CS signal is 3.0V.
  • the voltage difference ⁇ V of the effective voltages of the sub-pixels a and b is varied according to the color display pixel D.
  • the variation in the change rate of the 60-degree viewing angle normalized luminance with respect to the gradation change over the gradations 100 to 170 is smaller than that of the liquid crystal display device 800 in which the full width of the CS signal is 3.0V, 4.0V.
  • the change in the change rate of the 60-degree viewing angle normalized luminance is suppressed, and the change in the normalized luminance in the oblique direction with respect to the gradation change can be smoothed.
  • the full width of the CS signal when the full width of the CS signal is 1.0 V, the viewing angle characteristics from the oblique direction are slightly improved as compared with the case where the full width is zero. When the total width is less than 1.0 V, there is almost no improvement effect. In addition, when the entire width of the CS signal exceeds 5.0 V, the variation in the change rate of the normalized luminance in the oblique direction is further increased, and the display quality is greatly deteriorated. For this reason, it is preferable that the amplitudes Vad 1 and Vad 2 are different from each other and that 1/5 ⁇ Vad 2 / Vad 1 ⁇ 5.
  • the amplitude Vad 2 is larger than the amplitude Vad 1 , it is preferable that 1 ⁇ Vad 2 / Vad 1 ⁇ 5. Since the amplitude is proportional to the potential variation (full width) DerutaVad, potential variation DerutaVad 1, Similarly for DerutaVad 2, the potential variation ⁇ Vad 1, ⁇ Vad 2 are different from each other, and, 1/5 ⁇ Vad 2 / ⁇ Vad 1 ⁇ 5 is preferred. If the potential change amount ⁇ Vad 2 is larger than the potential change amount ⁇ Vad 1 , it is preferable that 1 ⁇ Vad 2 / ⁇ Vad 1 ⁇ 5.
  • ⁇ V 1 and ⁇ V 2 are different from each other and 1/5 ⁇ V 2 / ⁇ V 1 ⁇ 5 is preferable. Also, if [Delta] V 2 is greater than [Delta] V 1, 1 ⁇ is preferably ⁇ V 2 / ⁇ V 1 ⁇ 5.
  • each of the sub-pixel a color display pixel D 1, D 2, b of the auxiliary capacitance CSa, the capacitance value of CSb CCS 1, CCS 2 is equal Accordingly, equal K 1, K 2,
  • K 1 and K 2 may be different.
  • K 1 and K 2 are preferably different from each other and 1/5 ⁇ K 2 / K 1 ⁇ 5.
  • K 2 is greater than K 1, 1 ⁇ it is preferably K 2 / K 1 ⁇ 5.
  • the source signal voltages corresponding to the different colors are substantially equal.
  • the invention is not limited to this.
  • the source signal voltages corresponding to different colors may be different even if the gradations of red, green, and blue in the input signal are equal.
  • the voltage difference between the auxiliary capacitors of the sub-pixels of the pixels corresponding to the same color (for example, red) of the different color display pixels D is different. Even in the case of color, the front luminance may change, and the ⁇ characteristic in the front direction may change. In this case, even if the gradation of the same color (for example, red) in the input signal is the same, the writing voltage (source signal voltage) to the pixel of this color corresponding to the different color display pixel D is made different, so that the front direction By adjusting the luminance, the gamma characteristic in the front direction can be adjusted.
  • the red pixels R 1 and R 2 of the color display pixels D 1 and D 2 shown in FIG. 4 Focusing on the red pixels R 1 and R 2 of the color display pixels D 1 and D 2 shown in FIG. 4, for example, even when the gradations of the same color (for example, red) in the input signal are equal, the red pixels R 1 and R 2 In order to adjust the front luminance of the red pixel R 2 to be substantially equal to each other, the source signal voltages when writing to the red pixels R 1 and R 2 may be made different from each other. In this case, the average effective voltage of the sub-pixel R 1a and the sub-pixel R 1b of the red pixel R 1 is different from the average effective voltage of the sub-pixel R 2a and the sub-pixel R 2b of the red pixel R 2 .
  • the auxiliary capacitors CSa and CSb of the sub-pixels a and b may be different depending on the color display pixel D.
  • the luminance in the front direction may change due to the difference between the auxiliary capacitors CSa and CSb.
  • the voltages of the subpixel electrodes 14a and 14b decrease by Vd.
  • the value of the pull-in voltage Vd is the parasitic capacitance Cgd between the gate electrodes and the drain electrodes of the TFTs 16a and 16b, and all the capacitances connected to the drains of the TFTs 16a and 16b (liquid crystal capacitances CLa and CLb, auxiliary capacitances CSa and CSb, and others).
  • the parasitic capacitance is the parasitic capacitance Cgd between the gate electrodes and the drain electrodes of the TFTs 16a and 16b, and all the capacitances connected to the drains of the TFTs 16a and 16b (liquid crystal capacitances CLa and CLb, auxiliary capacitances CSa and CSb, and others). The parasitic capacitance).
  • the value of the pull-in voltage Vd also differs depending on the color display pixel D.
  • the average value (DC level) of the voltage applied to the liquid crystal layer 30 varies, and the counter electrode 24 is common to all the color display pixels D.
  • the DC voltage component applied to the liquid crystal layer 30 for all the color display pixels D cannot be sufficiently reduced even when the counter voltage is adjusted, and the display quality and reliability are improved. There may be a problem of lowering.
  • the luminance in the front direction can be matched by changing the source signal voltage with respect to the gradation level of the input signal by signal processing.
  • reliability can be improved by changing the Cgd of the TFTs 16a and 16b according to the color display pixel D and optimizing the counter voltage.
  • the ⁇ characteristics from the diagonal direction of the pixels can be varied and the ⁇ characteristics from the front can be adjusted. For this reason, even if the vertical scanning period is relatively long, that is, even if the writing frequency is low, it is possible to suppress the deterioration of display quality.
  • liquid crystal display device 100 of this embodiment will be described in detail with reference to FIGS. 9 to 11.
  • FIG. 9 shows an equivalent circuit of the liquid crystal display device 100 of the present embodiment.
  • the gate wirings G in the n-th row, the (n + 1) th row,... May be referred to as gate wirings G n , G n + 1 ,.
  • the auxiliary capacitor CSa of the sub-pixel a of the n-th row pixel corresponds to the CS line CCSa1 or CCSa2
  • the auxiliary capacitor CSb of the sub-pixel b of the n-th row pixel corresponds to the CS line CCSb1 or CCSb2.
  • the auxiliary capacitance CSa of the sub-pixel a of the pixel in the (n + 1) th row corresponds to the CS wiring CCSb1 or CCSb2
  • the auxiliary capacitance CSb of the sub-pixel b of the pixel in the (n + 1) th row corresponds to the CS wiring CCSc1 or CCSc2.
  • the capacitance values CCS of the auxiliary capacitors CSa and CSb are substantially equal to each other. For example, approximately equal auxiliary capacitance CSa the color display pixel D 1, the capacitance value CCS 1 of CSb auxiliary capacitance CSa the color display pixel D 2, the capacitance value CCS 2 of CSb.
  • the amplitude of the CS signal supplied to the CS wiring CCSa1 is substantially equal to the amplitude of the CS signal supplied to the CS wiring CCSb1, and the amplitude of the CS signal supplied to the CS wiring CCSa2 is supplied to the CS wiring CCSb2. It is almost equal to the amplitude of the CS signal. Note that the amplitude of the CS signal supplied to the CS wiring CCSa1 is different from the CS signal supplied to the CS wiring CCSa2. However, the phase of the CS signal supplied to the CS wiring CCSa1 may be equal to the phase of the CS signal supplied to the CS wiring CCSa2.
  • the amplitude of the CS signal supplied to the CS wiring CCSb1 is different from the CS signal supplied to the CS wiring CCSb2, and the amplitude of the CS signal supplied to the CS wiring CCSc1 is different from the CS signal supplied to the CS wiring CCSc2.
  • the red pixel R 1 of the color display pixel D 1 attention is paid to the red pixel R 1 of the color display pixel D 1 .
  • one electrode of each of the liquid crystal capacitor CLa and the auxiliary capacitor CSa is connected to the drain of the TFT 16 a that functions as a switching element of the sub-pixel a, and the other electrode of the liquid crystal capacitor CLa is connected to the counter electrode 24.
  • the other electrode of the auxiliary capacitor CSa is connected to the CS wiring CCSa1.
  • one electrode of each of the liquid crystal capacitor CLb and the auxiliary capacitor CSb is connected to the drain of the TFT 16b that functions as a switching element of the subpixel b, and the other electrode of the liquid crystal capacitor CLb is the counter electrode.
  • the gate of the TFTs 16a and 16b are both connected to the gate line Gn, and the sources of the TFTs 16a and 16b are both connected to the source line S.
  • the green pixel G 1 and the blue pixel B 1 of the color display pixel D 1 have the same configuration as the red pixel R 1 .
  • the red pixel R 2 of the color display pixel D 2 attention is paid to the red pixel R 2 of the color display pixel D 2 .
  • one electrode of each of the liquid crystal capacitor CLa and the auxiliary capacitor CSa is connected to the drain of the TFT 16a functioning as a switching element of the sub-pixel a, and the other electrode of the liquid crystal capacitor CLa is connected to the counter electrode 24.
  • the other electrode of the auxiliary capacitor CSa is connected to the CS wiring CCSa2.
  • one electrode of each of the liquid crystal capacitor CLb and the auxiliary capacitor CSb is connected to the drain of the TFT 16b functioning as a switching element of the subpixel b, and the other electrode of the liquid crystal capacitor CLb is the counter electrode.
  • the gates of the TFTs 16a and 16b are both connected to the gate line Gn, and the sources of the TFTs 16a and 16b are both connected to the source line S.
  • the green pixel G 2 and the blue pixel B 2 of the color display pixel D 2 have the same configuration as the red pixel R 2 .
  • the auxiliary capacitance of the sub-pixel a of the pixels R 3 , G 3 , and B 3 of the color display pixel D 3 corresponds to the CS wiring CCSb 2
  • the sub-pixel b The auxiliary capacitance corresponds to the CS wiring CCSc2.
  • the auxiliary capacitance of the sub-pixel a of the pixels R 4 , G 4 , and B 4 of the color display pixel D 4 corresponds to the CS wiring CCSb1
  • the auxiliary capacitance of the sub-pixel b corresponds to the CS wiring CCSc1.
  • FIG. 10 shows another equivalent circuit of the liquid crystal display device 100.
  • the auxiliary capacitors CSa and CSb of the sub-pixels a and b have different capacitance values depending on the color display pixel D.
  • the overlapping area between the auxiliary capacitance electrode and the auxiliary capacitance counter electrode in the sub-pixels a and b of the color display pixel D 1 is the difference between the auxiliary capacitance electrode and the auxiliary capacitance counter-electrode in the sub-pixels a and b of the color display pixel D 2 . It is different from the overlapping area.
  • the auxiliary capacitance of the sub-pixel a of the color display pixel D adjacent in the row direction corresponds to the same CS signal, and the auxiliary capacitance of the sub-pixel b of the color display pixel D adjacent in the row direction is different.
  • the auxiliary capacitance of the sub-pixel a of the color display pixels D 1 and D 2 corresponds to the CS signal corresponding to the CS wiring CCSa
  • the auxiliary capacitance of the sub-pixel b of the color display pixels D 1 and D 2 is the CS wiring. It corresponds to the CS signal corresponding to CCSb.
  • the red pixel R 1 of the color display pixel D 1 attention is paid to the red pixel R 1 of the color display pixel D 1 .
  • one electrode of each of the liquid crystal capacitor CLa and the auxiliary capacitor CSa is connected to the drain of the TFT 16 a that functions as a switching element of the sub-pixel a, and the other electrode of the liquid crystal capacitor CLa is connected to the counter electrode 24.
  • the other electrode of the auxiliary capacitor CSa is connected to the CS wiring CCSa.
  • one electrode of each of the liquid crystal capacitor CLb and the auxiliary capacitor CSb is connected to the drain of the TFT 16b that functions as a switching element of the subpixel b, and the other electrode of the liquid crystal capacitor CLb is the counter electrode.
  • the gate of the TFTs 16a and 16b are both connected to the gate line Gn, and the sources of the TFTs 16a and 16b are both connected to the source line S.
  • the green pixel G 1 and the blue pixel B 1 of the color display pixel D 1 have the same configuration as the red pixel R 1 .
  • the red pixel R 2 of the color display pixel D 2 attention is paid to the red pixel R 2 of the color display pixel D 2 .
  • one electrode of each of the liquid crystal capacitor CLa and the auxiliary capacitor CSa is connected to the drain of the TFT 16a functioning as a switching element of the sub-pixel a, and the other electrode of the liquid crystal capacitor CLa is connected to the counter electrode 24.
  • the other electrode of the auxiliary capacitor CSa is connected to the CS wiring CCSa.
  • one electrode of each of the liquid crystal capacitor CLb and the auxiliary capacitor CSb is connected to the drain of the TFT 16b functioning as a switching element of the subpixel b, and the other electrode of the liquid crystal capacitor CLb is the counter electrode.
  • the gate of the TFTs 16a and 16b are both connected to the gate line Gn, and the sources of the TFTs 16a and 16b are both connected to the source line S.
  • the green pixel G 2 and the blue pixel B 2 of the color display pixel D 2 have the same configuration as the red pixel R 2 .
  • the capacitance value of the auxiliary capacitor CSa of the sub-pixel a of the color display pixel D 1 is different from the capacitance value of the auxiliary capacitor CSa of the sub-pixel a of the color display pixel D 2.
  • the effective of the sub-pixel a in the pixels R 1 , G 1 and B 1 of the color display pixel D 1 The voltage can be made different from the effective voltage of the sub-pixel a in the pixels R 2 , G 2 , and B 2 of the color display pixel D 2 .
  • the capacitance value of the auxiliary capacitance CSb subpixels b of the color display pixels D 1 is different from the capacitance of the auxiliary capacitor CSb subpixels b of color display pixel D 2, the color display pixel D 1, D 2
  • the effective voltage of the sub-pixel b in the pixels R 1 , G 1 , B 1 of the color display pixel D 1 is set to the color display pixel D 2 .
  • the effective voltage of the sub-pixel b in the pixels R 2 , G 2 , and B 2 can be made different. For this reason, the viewing angle characteristics of the liquid crystal display device 100 are further improved.
  • the average of the effective voltage and the effective voltage of the sub-pixel b of the sub-pixel a in each of the color pixels R 1 display pixel D 1, G 1, B 1 is a color display pixel D 2 of the pixel R 2 , G 2 and B 2 are approximately equal to the average of the effective voltage of the subpixel a and the effective voltage of the subpixel b.
  • the auxiliary capacitance of the sub-pixel a of the pixels R 3 , G 3 , and B 3 of the color display pixel D 3 corresponds to the CS wiring CCSb
  • the auxiliary capacitance of the sub-pixel b The capacitance corresponds to the CS wiring CCSc.
  • the auxiliary capacitance of the sub-pixel a of the pixels R 4 , G 4 , and B 4 of the color display pixel D 4 corresponds to the CS wiring CCSb
  • the auxiliary capacitance of the sub-pixel b corresponds to the CS wiring CCSc.
  • the auxiliary capacitances of the adjacent sub-pixels among the color display pixels D adjacent in the column direction correspond to the same CS wiring, thereby reducing the number of CS wirings and increasing the aperture ratio. be able to.
  • one CS wiring corresponds to the sub-pixel b of one pixel and the sub-pixel a of the other pixel of two pixels adjacent in the column direction. Is not limited to this.
  • FIG. 11 shows still another equivalent circuit of the liquid crystal display device 100.
  • the liquid crystal display device 100 shown in FIG. 11 has the same configuration as that of the liquid crystal display device shown in FIG.
  • the capacitance values of the sub-pixels a and b differ depending on the color display pixel D.
  • the pixels R 1 of the color display pixel D 1, G 1, B 1 sub-pixels in a, b of the auxiliary capacitance CSa, the electrostatic capacitance value CCS 1 of CSb, the pixels R 2 of the color display pixels D 2, G 2 , B 2 is different from the capacitance values CCS 2 of the auxiliary capacitors CSa and CSb of the sub-pixels a and b.
  • the overlapping area of the auxiliary capacitance electrode and the auxiliary capacitance counter electrode in the sub-pixels a and b of the color display pixel D 1 is the overlapping area of the auxiliary capacitance electrode and the auxiliary capacitance counter-electrode in the sub pixels a and b of the color display pixel D 2. Is different.
  • the auxiliary capacitance of the sub-pixel a of the color display pixel D adjacent in the row direction corresponds to the same CS signal, and the auxiliary capacitance of the sub-pixel b of the color display pixel D adjacent in the row direction is different.
  • the auxiliary capacitance of the sub-pixel a of the color display pixels D 1 and D 2 corresponds to the CS signal corresponding to the CS wiring CCSa
  • the auxiliary capacitance of the sub-pixel b of the color display pixels D 1 and D 2 is the CS wiring. It corresponds to the CS signal corresponding to CCSb.
  • the red pixel R 1 of the color display pixel D 1 attention is paid to the red pixel R 1 of the color display pixel D 1 .
  • one electrode of each of the liquid crystal capacitor CLa and the auxiliary capacitor CSa is connected to the drain of the TFT 16 a that functions as a switching element of the sub-pixel a, and the other electrode of the liquid crystal capacitor CLa is connected to the counter electrode 24.
  • the other electrode of the auxiliary capacitor CSa is connected to the CS wiring CCSa1.
  • one electrode of each of the liquid crystal capacitor CLb and the auxiliary capacitor CSb is connected to the drain of the TFT 16b that functions as a switching element of the subpixel b, and the other electrode of the liquid crystal capacitor CLb is the counter electrode.
  • the gate of the TFTs 16a and 16b are both connected to the gate line Gn, and the sources of the TFTs 16a and 16b are both connected to the source line S.
  • the green pixel G 1 and the blue pixel B 1 of the color display pixel D 1 have the same configuration as the red pixel R 1 .
  • the red pixel R 2 of the color display pixel D 2 attention is paid to the red pixel R 2 of the color display pixel D 2 .
  • one electrode of each of the liquid crystal capacitor CLa and the auxiliary capacitor CSa is connected to the drain of the TFT 16a functioning as a switching element of the sub-pixel a, and the other electrode of the liquid crystal capacitor CLa is connected to the counter electrode 24.
  • the other electrode of the auxiliary capacitor CSa is connected to the CS wiring CCSa1.
  • one electrode of each of the liquid crystal capacitor CLb and the auxiliary capacitor CSb is connected to the drain of the TFT 16b functioning as a switching element of the subpixel b, and the other electrode of the liquid crystal capacitor CLb is the counter electrode.
  • the gate of the TFTs 16a and 16b are both connected to the gate line Gn, and the sources of the TFTs 16a and 16b are both connected to the source line S.
  • the green pixel G 2 and the blue pixel B 2 of the color display pixel D 2 have the same configuration as the red pixel R 2 .
  • the auxiliary capacitance of the sub-pixel a of the pixels R 3 , G 3 , and B 3 of the color display pixel D 3 corresponds to the CS wiring CCSb 2
  • the auxiliary capacitance of the sub-pixel b The capacitance corresponds to the CS wiring CCSc2.
  • the auxiliary capacitance of the sub-pixel a of the pixels R 4 , G 4 , and B 4 of the color display pixel D 4 corresponds to the CS wiring CCSb2
  • the auxiliary capacitance of the sub-pixel b corresponds to the CS wiring CCSc2.
  • the capacitance value of the auxiliary capacitor CSa of the sub-pixel a of the color display pixel D 1 is different from the capacitance value of the auxiliary capacitor CSa of the sub-pixel a of the color display pixel D 2.
  • the effective of the sub-pixel a in the pixels R 1 , G 1 and B 1 of the color display pixel D 1 The voltage can be made different from the effective voltage of the sub-pixel a in the pixels R 2 , G 2 , and B 2 of the color display pixel D 2 .
  • the capacitance value of the auxiliary capacitance CSb subpixels b of the color display pixels D 1 is different from the capacitance of the auxiliary capacitor CSb subpixels b of color display pixel D 2, the color display pixel D 1, D 2
  • the effective voltage of the sub-pixel b in the pixels R 1 , G 1 , B 1 of the color display pixel D 1 is set to the color display pixel D 2 .
  • the effective voltage of the sub-pixel b in the pixels R 2 , G 2 , and B 2 can be made different. For this reason, the viewing angle characteristics of the liquid crystal display device 100 are further improved.
  • the color display pixels D 1 and D 4 having the voltage difference ⁇ V 1 are arranged obliquely, and the color display pixels D 2 and D 3 having the voltage difference ⁇ V 2 are arranged obliquely. Is not limited to this.
  • the color display pixels D having different voltage differences between the effective voltages of the sub-pixels a and b may be arbitrarily arranged.
  • the parasitic capacitance corresponding to each source line is preferably substantially constant.
  • the color display pixels D having the voltage difference ⁇ V 1 are arranged in the row direction in a certain row, and the color display pixels D having the voltage difference ⁇ V 2 are arranged in the row direction in adjacent rows. Good.
  • the color display pixels D having the voltage difference ⁇ V 1 and the color display pixels D having the voltage difference ⁇ V 2 are alternately arranged.
  • the parasitic capacitance corresponding to the source line is substantially constant, but the present invention is not limited to this.
  • the capacitance corresponding to each CS wiring may be substantially constant.
  • color display pixels D having a voltage difference ⁇ V 1 are arranged in a column in a certain column, and color display pixels D having a voltage difference ⁇ V 2 are arranged in a column direction in an adjacent column. Also good.
  • the color display pixel D having the voltage difference ⁇ V 1 and the color display pixel D having the voltage difference ⁇ V 2 are alternately arranged.
  • the capacitance corresponding to the source line or the CS wiring is set to be substantially constant, but the present invention is not limited to this.
  • the capacitance corresponding to each of the source line and the CS wiring may be substantially constant.
  • the color display pixels D having the voltage difference ⁇ V 1 may be arranged in a checkered pattern
  • the color display pixels D having the voltage difference ⁇ V 2 may be arranged in a checkered pattern.
  • the color display pixel D having the voltage difference ⁇ V 1 and the color display pixel D having the voltage difference ⁇ V 2 are alternately arranged, and the color display having the voltage difference ⁇ V 1 is also viewed in the column direction. Pixels D and color display pixels D having a voltage difference ⁇ V 2 are alternately arranged.
  • color display pixels D having different voltage differences ⁇ V between the effective voltages of the sub-pixels a and b, but the present invention is not limited to this.
  • three or more color display pixels D having different capacitance values CCS of the auxiliary capacitors CSa and CSb of the sub-pixels a and b may be provided.
  • full width of the CS signal there are two types of full width of the CS signal (for example, two types of full width of 2.0 V and 4.0 V in the description with reference to FIGS. 7 and 8). There may be three or more types of full widths. Note that the full width of the CS signal is larger than a value that can suppress whitening to some extent even when one type of full width CS signal is used (the full width is 2.0 V in the description with reference to FIGS. 7 and 8 above). It is preferably a value. Of course, two or more types of color display pixels D having different capacitance values CCS of the auxiliary capacitors CSa and CSb of the sub-pixels a and b may be provided, and two or more types of the full width of the CS signal may be provided.
  • the color display pixels D having different voltage differences ⁇ V are arranged adjacent to any of the row direction, the column direction, and the diagonal direction for each of the color display pixels D.
  • the invention is not limited to this.
  • the voltage difference ⁇ V between the color display pixels D adjacent in any of the row direction, the column direction, and the diagonal direction may be substantially equal. That is, the color display pixels D having different voltage differences ⁇ V may be arranged apart from each other.
  • FIG. 15 shows a schematic diagram of a liquid crystal display device 100A of the present embodiment.
  • the liquid crystal display device 100A of the present embodiment is the same as that described above except that the voltage difference ⁇ V between the effective voltages of the sub-pixels a and b in the pixels R, G, and B in the same color display pixel D is not constant.
  • the configuration is the same as that of 100, and redundant description is omitted to avoid redundancy.
  • FIG. 15 shows the voltage difference ⁇ V between the effective voltage of the sub-pixel a and the effective voltage of the sub-pixel b in the four color display pixels D 1 to D 4 and each pixel in the liquid crystal display device 100A of the present embodiment.
  • the colors displayed by the four color display pixels D 1 to D 4 are equal to each other, and in each of the color display pixels D 1 to D 4 , the red pixel R, the green pixel G, and the blue pixel B are Equal halftones are shown, and the color display pixels D 1 to D 4 show achromatic colors.
  • the voltage difference between the effective voltage of the sub-pixel R 1a and the effective voltage of the sub-pixel R 1b is ⁇ V R1 .
  • the voltage difference between the effective voltage of the sub-pixel G 1a and the effective voltage of the sub-pixel G 1b is ⁇ V G1
  • the effective voltage of the sub-pixel B 1a and the sub-pixel B 1b The voltage difference from the effective voltage is ⁇ V B1 .
  • the voltage differences ⁇ V R1 , ⁇ V G1 , ⁇ V B1 in the color display pixel D 1 are not constant.
  • CCS B capacitance values CCS R, CCS G
  • the overlapping area of the auxiliary capacitance electrodes forming the auxiliary capacitances CSa and CSb of the sub-pixels a and b and the auxiliary capacitance counter electrode may be made different according to the pixels R 1 , G 1 and B 1 .
  • the amplitude Vad of the auxiliary capacitance signal (CS signal) supplied to the auxiliary capacitance counter electrodes of the auxiliary capacitances CSa and CSb of the sub-pixels a and b of the pixels R 1 , G 1 and B 1 is set. If they are referred to as Vad R , Vad G , and Vad B , respectively, the amplitudes Vad R , Vad G , and Vad B may be made different depending on the pixels R 1 , G 1, and B 1 . Thus, the viewing angle in the oblique direction can be further improved by making the voltage difference between the effective voltages of the sub-pixels a and b of the pixels R 1 , G 1 and B 1 in the color display pixel D 1 different. it can.
  • the voltage difference ⁇ V R2 between the effective voltage of the sub-pixel R 2a and the effective voltage of the sub-pixel R 2b in the red pixel R 2 of the color display pixel D 2 is different from ⁇ V R1 .
  • the voltage difference ⁇ V G2 between the effective voltage of the sub-pixel G 2a and the effective voltage of the sub-pixel G 2b in the green pixel G 2 is different from ⁇ V G1 .
  • the voltage difference ⁇ V B2 between the effective voltage of the sub-pixel B 2a and the effective voltage of the sub-pixel B 2b in the blue pixel B 2 is different from ⁇ V B1 .
  • the voltage differences ⁇ V R2 , ⁇ V G2 , and ⁇ V B2 are not constant.
  • the voltage difference ⁇ V B1 is preferably smaller than the voltage differences ⁇ V R1 and ⁇ V G1 .
  • the voltage difference ⁇ V B1 of the blue pixel B is smaller than the voltage differences ⁇ V R1 and ⁇ V G1 of the red pixel R and the green pixel G, thereby causing a color balance shift due to an oblique viewing angle. Can be suppressed.
  • the voltage difference [Delta] V R1 may be larger or smaller than the voltage difference [Delta] V G1.
  • the voltage difference [Delta] V R1 may be substantially equal to the voltage difference [Delta] V G1.
  • the voltage difference ⁇ V B2 is preferably smaller than the voltage differences ⁇ V R2 and ⁇ V G2 .
  • the voltage difference [Delta] V R2 may be larger or smaller than the voltage difference [Delta] V G2.
  • the voltage difference [Delta] V R2 may be substantially equal to the voltage difference [Delta] V G2.
  • the ratio of the voltage differences ⁇ V R1 , ⁇ V G1 and ⁇ V B1 is preferably substantially equal to the ratio of the voltage differences ⁇ V R2 , ⁇ V G2 and ⁇ V B2 . In this case, it is possible to easily suppress the chromaticity change from the oblique direction in each color display pixel D.
  • FIG. 16 is a schematic diagram of four color display pixels in the liquid crystal display device 800A of the comparative example.
  • the liquid crystal display device 800A subpixel a in the color display pixel D 1 of the, b of the auxiliary capacitance CSa, capacitance CCS of CSb is substantially constant.
  • the amplitudes Vad R , Vad G , and Vad B of the CS voltage in the color display pixel D 1 are not constant.
  • the full widths ⁇ Vad R and ⁇ Vad G are 2.0V
  • ⁇ Vad B is 1.6V.
  • the color display pixels D 2 to D 4 have the same configuration as the color display pixel D 1 .
  • the capacitance values CCS of the auxiliary capacitors CSa and CSb of the sub-pixels a and b are almost constant.
  • the amplitude Vad of the CS voltage in each of the color display pixels D 2 to D 4 is not constant.
  • the full widths ⁇ Vad R and ⁇ Vad G are 2.0V
  • the full width ⁇ Vad B is 1.6V.
  • the colors displayed by the four color display pixels D 1 to D 4 in the input signal are equal to each other.
  • the red pixel R, the green pixel G, and the blue pixel B exhibit the same intermediate gradation, and the color display pixels D 1 to D 4 exhibit an achromatic color.
  • FIG. 17A shows a change in chromaticity u ′ with respect to a gradation change in the liquid crystal display device 800A
  • FIG. 17B shows a change in chromaticity v ′ with respect to a gradation change.
  • FIGS. 17A and 17B show the chromaticities u ′ and v ′ when viewed from the right at 45 ° with respect to the normal direction of the main surface of the liquid crystal display device 800A.
  • the liquid crystal display device 800A is in the 4DRTN mode.
  • FIGS. 17A and 17B show the results of changing the full width ⁇ Vad B of the CS signal to 1.4V, 1.6V, and 2.0V, respectively.
  • ⁇ Vad R and ⁇ Vad G are 2.0V
  • the ratio (X) of the total width ⁇ Vad B (1.4V, 1.6V and 2.0V) to ⁇ Vad R and ⁇ Vad G (2.0V) is , 0.7, 0.8, and 1.0, respectively.
  • FIG. 18 is a schematic diagram of four color display pixels in the liquid crystal display device 800B of the comparative example.
  • the liquid crystal display device 800B subpixel a in the color display pixel D 1 of the, b of the auxiliary capacitance CSa, capacitance CCS of CSb is substantially constant.
  • the amplitudes Vad R , Vad G , and Vad B in the color display pixel D 1 are not constant.
  • the full widths ⁇ Vad R and ⁇ Vad G are 4.0V
  • the full width ⁇ Vad B is 3.2V.
  • the color display pixels D 2 to D 4 have the same configuration as the color display pixel D 1 .
  • the capacitance values CCS of the auxiliary capacitors CSa and CSb of the sub-pixels a and b are substantially constant.
  • the amplitude Vad of the CS voltage in each of the color display pixels D 2 to D 4 is not constant.
  • ⁇ Vad R and ⁇ Vad G are 4.0V
  • ⁇ Vad B is 3.2V.
  • FIG. 19A shows a change in chromaticity u ′ with respect to a gradation change in the liquid crystal display device 800B
  • FIG. 19B shows a change in chromaticity v ′ with respect to a gradation change.
  • FIGS. 19A and 19B show chromaticities u ′ and v ′ when viewed from the right at 45 ° with respect to the normal direction of the main surface of the liquid crystal display device 800B.
  • the liquid crystal display device 800B is in the 4DRTN mode.
  • ⁇ Vad B 2.8V, 3.2V and 4.0V
  • ⁇ Vad R and ⁇ Vad G are 4.0V
  • the ratio (X) of ⁇ Vad B (2.8V, 3.2V and 4.0V) to ⁇ Vad R and ⁇ Vad G (4.0V). are 0.7, 0.8, and 1.0, respectively.
  • FIG. 20 shows the amplitude of the CS signal corresponding to the four color display pixels and the auxiliary capacitance of each pixel in the liquid crystal display device 100A of the present embodiment.
  • Subpixel a in the color display pixel D 1 of the liquid crystal display device 100A, b of the auxiliary capacitance CSa, capacitance CCS of CSb is substantially constant.
  • the amplitudes Vad R1 , Vad G1 , and Vad B1 of the CS voltage in the color display pixel D 1 are not constant.
  • ⁇ Vad R1 and ⁇ Vad G1 are 2.0V and ⁇ Vad B1 is 1.6V, as in the liquid crystal display device 800A of the comparative example described above with reference to FIGS.
  • the amplitudes Vad R2 , Vad G2 , and Vad B2 are not constant.
  • ⁇ Vad R2 and ⁇ Vad G2 are 4.0 V and ⁇ Vad B2 is 3.2 V, as in the liquid crystal display device 800B of the comparative example described above with reference to FIGS.
  • each pixel R in the color display pixel D 3 and D 4 is also a color display pixel D 1 and D 2.
  • the capacitance values CCS of the auxiliary capacitors CSa and CSb of the sub-pixels a and b are almost constant.
  • the amplitude Vad of the CS voltage in each of the color display pixels D 3 and D 4 is not constant.
  • ⁇ Vad R3 and ⁇ Vad G3 are 2.0V
  • ⁇ Vad B3 is 1.6V
  • ⁇ Vad R4 and ⁇ Vad G4 are 4.0V
  • FIG. 21A shows a change in chromaticity u ′ with respect to a gradation change in the liquid crystal display device 100A
  • FIG. 21B shows a change in chromaticity v ′ with respect to a gradation change.
  • FIGS. 21A and 21B show chromaticities u ′ and v ′ when viewed from the right at 45 ° with respect to the normal direction of the main surface of the liquid crystal display device 100A.
  • the amplitudes Vad R , Vad G , and Vad B of the CS signal are different depending on the color display pixel D, the amplitudes Vad R , Vad G , and Vad B of the CS signal in the same color display pixel D are constant.
  • the amplitude Vad B is smaller than the amplitudes Vad R and Vad G in each color display pixel D, whereby the voltage difference ⁇ V B is changed from the voltage differences ⁇ V R and ⁇ V G in each color display pixel D. Therefore, yellow shift can be improved.
  • the preferable ratio X varies depending on the liquid crystal capacitors CLa and CLb and the auxiliary capacitors CSa and CSb of the sub-pixels a and b, and may be set as appropriate.
  • the capacitance values of the auxiliary capacitors CSa and CSb are substantially equal in each color display pixel D, and the amplitudes Vad R , Vad G , and Vad of the CS signals of the pixels R, G, and B in the color display pixel D are used.
  • the present invention is not limited to this.
  • the amplitude Vad R , Vad G , Vad B of the CS signal is made substantially equal in each color display pixel D, and the capacitance values CCS R of the auxiliary capacitors CSa, CSb of the pixels R, G, B of the color display pixel D are set.
  • CCS G and CCS B may be different.
  • FIG. 22 shows the ratio of the capacitance values of the four color display pixels and the auxiliary capacitance of each pixel in the liquid crystal display device 100A of the present embodiment.
  • the amplitude of the CS voltage in each of the color display pixels D is substantially constant.
  • the capacitance values CCS R1 , CCS G1 , and CCS B1 of the auxiliary capacitors CSa and CSb of the color display pixel D in the color display pixel D 1 are not constant, Accordingly, K R1 , K G1 , and K B1 are not constant.
  • K R1 , K G1 , and K B1 are 1.0, 1.0, and 0.8, respectively.
  • the capacitance values CCS R2 , CCS G2 , and CCS B2 of the auxiliary capacitors CSa and CSb of the pixels R, G, and B of the color display pixel D 2 in the color display pixel D 2 are the capacitance values CCS R1 , CCS G1 , and CCS B1 , respectively. Accordingly, K R2 , K G2 and K B2 are different from K R1 , K G1 and K B1 . Note that the capacitance values CCS R2 , CCS G2 , and CCS B2 are not constant, and accordingly, K R2 , K G2 , and K B2 are not constant. For example, K R2 , K G2 , and K B2 are 2.0, 2.0, and 1.6, respectively.
  • the pixels R, G, and B in the color display pixels D 3 and D 4 are substantially the same as the color display pixels D 1 and D 2 , respectively.
  • the ratio of K R3 and K G3 is 1.0
  • K B3 is 0.8
  • K R4 and K G4 are 2.0
  • K B4 is 1.6
  • the viewing angle characteristics can be further improved by making the capacitance values CCS R , CCS G , and CCS B of the auxiliary capacitors CSa and CSb in the color display pixel D different.
  • both the amplitudes Vad R , Vad G , Vad B and the capacitance values of the auxiliary capacitors CSa, CSb may be changed in accordance with the color display pixel D.
  • the present invention is limited to Not.
  • the voltage difference ⁇ V of another pixel may be different from the voltage difference ⁇ V of another pixel.
  • Red pixel R in each color display pixel D, the voltage difference [Delta] V R of the green pixel G, and [Delta] V G was equal to one another, the present invention is not limited thereto. Red pixel R, the voltage difference [Delta] V R of the green pixel G, [Delta] V G may be different.
  • the areas of the sub-pixels a and b in the same pixel are almost equal, but the present invention is not limited to this.
  • the areas of the sub-pixels a and b in the same pixel may be different.
  • one pixel has two sub-pixels that can have different luminances, but the present invention is not limited to this.
  • One pixel may have three or more subpixels that can have different luminances.
  • the color display pixel has three pixels of a red pixel, a green pixel, and a blue pixel, but the present invention is not limited to this.
  • the color display pixel may have four or more pixels.
  • the color display pixel may have a yellow pixel in addition to a red pixel, a green pixel, and a blue pixel.
  • the color display pixel may include a yellow pixel and a cyan pixel in addition to a red pixel, a green pixel, and a blue pixel.
  • the display quality in the oblique direction of the liquid crystal display device can be improved.

Abstract

La présente invention porte sur un dispositif d'affichage à cristaux liquides (100) qui est pourvu d'une pluralité de pixels d'affichage de couleur comprenant des pixels d'affichage de couleur (D1, D2). Chacun de la pluralité de pixels d'affichage de couleur possède une pluralité de pixels comprenant des pixels (R, G, B) et chacun de la pluralité de pixels possède des sous-pixels (a, b). Lorsque chacun d'un pixel (R1) du pixel d'affichage de couleur (D1) et d'un pixel (R2) du pixel d'affichage de couleur (D2) s'affiche au moins dans une certaine gradation moyenne, la différence de tension ΔV1 entre la tension efficace du sous-pixel (R1a) et la tension efficace du sous-pixel (R1b) dans le pixel (R1) du pixel d'affichage de couleur (D1) est différente de la différence de tension ΔV2 entre la tension efficace du sous-pixel (R2a) et la tension efficace du sous-pixel (R2b) dans le pixel (R2) du pixel d'affichage de couleur (D2).
PCT/JP2011/080368 2011-01-07 2011-12-28 Dispositif d'affichage à cristaux liquides WO2012093630A1 (fr)

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WO2016098232A1 (fr) * 2014-12-18 2016-06-23 堺ディスプレイプロダクト株式会社 Dispositif d'affichage à cristaux liquides et son procédé de commande
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WO2016051575A1 (fr) * 2014-10-02 2016-04-07 堺ディスプレイプロダクト株式会社 Afficheur a cristaux liquides
WO2016098232A1 (fr) * 2014-12-18 2016-06-23 堺ディスプレイプロダクト株式会社 Dispositif d'affichage à cristaux liquides et son procédé de commande
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US20180335671A1 (en) * 2016-11-02 2018-11-22 Shenzhen China Star Optoelectronics Technology Co., Ltd. Liquid crystal panel and display device

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