WO2011040370A1 - 液晶表示装置 - Google Patents
液晶表示装置 Download PDFInfo
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- WO2011040370A1 WO2011040370A1 PCT/JP2010/066699 JP2010066699W WO2011040370A1 WO 2011040370 A1 WO2011040370 A1 WO 2011040370A1 JP 2010066699 W JP2010066699 W JP 2010066699W WO 2011040370 A1 WO2011040370 A1 WO 2011040370A1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/201—Filters in the form of arrays
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133509—Filters, e.g. light shielding masks
- G02F1/133514—Colour filters
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
- G02F2201/52—RGB geometrical arrangements
Definitions
- the present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device that performs display in four primary colors.
- the liquid crystal display device has advantages such as light weight, thinness, and low power consumption, and is used not only as a small display device such as a display unit of a mobile phone but also as a large television.
- a color liquid crystal display device that is widely used, one pixel is composed of sub-pixels corresponding to the three primary colors of red (R), green (G), and blue (B) light. The color difference between red, green and blue is realized by the color filter.
- the concentration of the pigment in the color filter is increased.
- the transmittance of the color filter layer decreases, and high luminance cannot be realized.
- a display device that additively mixes four or more primary colors has been proposed (see, for example, Patent Documents 1 to 3).
- a display device that performs display using four or more primary colors is also called a multi-primary color display device.
- the color reproduction range can be expanded relatively easily.
- the present invention has been made in view of the above problems, and an object of the present invention is to provide a liquid crystal display device that expands a color reproduction range and suppresses a decrease in transmittance of a color filter layer.
- a liquid crystal display device is a liquid crystal display device including pixels having a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a yellow sub-pixel, and includes a backlight and a liquid crystal panel.
- the yellow sub-pixel has a chromaticity outside the triangle connecting the red sub-pixel, the green sub-pixel and the blue sub-pixel, and the red sub-pixel, the green subpixel, the blue subpixel and respective opening areas S R of the yellow sub-pixel, S G, S B, S Y, and the red color filter, the green color filter, the blue mosquito Over filter and respective transmittances T R of the yellow color filter, T G, T B, T Y is, T Y> [(S R + S G + S B + S Y) (T R + T G + T B) -3 (S R ⁇ T R + S G ⁇ T G + S B ⁇ T B )] / 3S Y is satisfied.
- the opening area of at least one of the red sub-pixel, the green sub-pixel, the blue sub-pixel, and the yellow sub-pixel is the opening area of any sub-pixel of the other sub-pixels. Is different.
- an opening area of the red sub-pixel is larger than an opening area of the green sub-pixel and the yellow sub-pixel, and an opening area of the blue sub-pixel is an opening of the green sub-pixel and the yellow sub-pixel. Greater than area.
- opening areas of the red sub-pixel, the green sub-pixel, the blue sub-pixel, and the yellow sub-pixel are substantially equal to each other.
- the transmittance of the yellow color filter is higher than the arithmetic average of the transmittances of the red color filter, the green color filter, and the blue color filter.
- the present invention it is possible to provide a liquid crystal display device that expands the color reproduction range and suppresses a decrease in the transmittance of the color filter layer.
- (A) is a schematic diagram of embodiment of the liquid crystal display device by this invention
- (b) is a schematic diagram of the liquid crystal panel in the liquid crystal display device of (a).
- 3 is a graph showing a transmission spectrum of each color filter in the liquid crystal display device shown in FIG. 1.
- FIG. 2 is an xy chromaticity diagram showing chromaticity of each sub-pixel in the liquid crystal display device shown in FIG. 1.
- (A) is a schematic diagram of the liquid crystal display device of a comparative example
- (b) is a schematic diagram of the liquid crystal panel in the liquid crystal display device of (a).
- (A) is a chromaticity diagram comparing the color reproduction ranges of the liquid crystal display device shown in FIG.
- (b) is a liquid crystal display of the liquid crystal display device of FIG. 1 and the comparative example. It is the graph which showed the NTSC ratio and transmittance
- (A) is a schematic diagram of further another embodiment of the liquid crystal display device by this invention,
- (b) is a schematic diagram of the liquid crystal panel in the said liquid crystal display device. It is a graph which shows the emission spectrum of the backlight in the liquid crystal display device shown in FIG. (A) is an xy chromaticity diagram comparing the color reproduction ranges of the liquid crystal display device shown in FIG.
- FIGS. 7 and 7 are schematic diagrams showing the orientation directions of liquid crystal molecules in the liquid crystal panel of the liquid crystal display device shown in FIGS. 1 and 7, respectively.
- 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 liquid crystal panel 200 and a backlight 300.
- the liquid crystal panel 200 includes a rear substrate 220, a front substrate 240, a liquid crystal layer 260 provided between the rear substrate 220 and the front substrate 240, and a color filter layer 280.
- the back substrate 220 includes an insulating substrate 222, a pixel electrode 224, and a first alignment film 226.
- the front substrate 240 includes an insulating substrate 242, a counter electrode 244, and a second alignment film 246.
- the color filter layer 280 is provided between the insulating substrate 242 and the counter electrode 244 of the front substrate 240.
- the rear substrate 220 and the front substrate 240 are provided with polarizing plates (not shown), and the transmission axes of the polarizing plates have a crossed Nicols relationship.
- the back substrate 220 is provided with a wiring, an insulating layer, etc. (not shown).
- the thickness of the liquid crystal layer 260 is substantially constant.
- FIG. 1B shows a schematic diagram of the liquid crystal panel 200.
- the liquid crystal panel 200 is provided with a plurality of pixels P arranged in a matrix of a plurality of rows and a plurality of columns. Each pixel P is defined by a pixel electrode 124. Each pixel P has a red sub-pixel R, a green sub-pixel G, a blue sub-pixel B, and a yellow sub-pixel Y. The red sub-pixel R, the green sub-pixel G, the blue sub-pixel B and the yellow sub-pixel Y are arranged in the row direction (x direction), and the red sub-pixel R, the green sub-pixel G, the blue sub-pixel B and the yellow sub-pixel are arranged. The brightness of Y can be controlled independently. As described above, the liquid crystal panel 200 performs display in four primary colors, that is, red, green, blue, and yellow.
- the liquid crystal panel 200 is a transmissive type, and in the liquid crystal panel 200, each of the sub-pixels R, G, B, and Y has a transmissive region.
- the light emitted from the backlight 300 is modulated in the liquid crystal panel 200, and a desired image is displayed.
- the transmission regions (opening areas) of the red sub-pixel R, the green sub-pixel G, the blue sub-pixel B, and the yellow sub-pixel Y are substantially equal to each other.
- the color filter layer 280 includes a red color filter CR corresponding to the red subpixel R, a green color filter CG corresponding to the green subpixel G, a blue color filter CB corresponding to the blue subpixel B, and a yellow subpixel Y. And a corresponding yellow color filter CY.
- the color filter layer 280 is produced, for example, by performing a photoresist process on the color photoresist film.
- the liquid crystal panel 200 may be provided with a multi-primary color conversion unit (not shown) that converts an input video signal corresponding to a display device of three primary colors.
- the multi-primary color conversion unit converts the gradation level of the input video signal into a gradation level corresponding to the liquid crystal panel 200.
- the multi-primary color conversion unit may have, for example, a look-up table for converting the gradation levels of the three primary colors indicated in the input video signal into gradation levels of red, green, blue, and yellow sub-pixels. .
- the backlight 300 includes blue light emitting and red / green fluorescent type LEDs.
- the peak of radiant intensity corresponding to blue is higher than the radiant intensity corresponding to green and red
- the peak of radiant intensity corresponding to green is higher than the radiant intensity corresponding to red.
- FIG. 2 shows transmission spectra of the red, green, blue, and yellow color filters CR, CG, CB, and CY.
- the transmission spectra of the red, green, blue, and yellow color filters CR, CG, CB, and CY are shown as CR, CG, CB, and CY, respectively.
- the transmission spectrum of the blue color filter CB shows a peak around a wavelength of 450 nm.
- the transmission spectrum of the green color filter CG shows a peak near the wavelength of 530 nm.
- the yellow color filter CY exhibits a transmittance of 90% or more at a wavelength of 550 nm to 700 nm
- the red color filter CR exhibits a transmittance of 90% or more at a wavelength of 610 nm to 700 nm.
- Such a transmission spectrum is measured using a spectrophotometer.
- FIG. 3 shows an xy chromaticity diagram representing the chromaticity of each sub-pixel in the liquid crystal display device 100.
- R, G, B, and Y indicate the chromaticities of the corresponding sub-pixels, respectively.
- R is the chromaticity of the liquid crystal display device 100 when the red sub pixel has the highest luminance and the other sub pixels have the lowest luminance.
- the color reproduction range of the liquid crystal display device 100 is represented by a rectangle having R, G, B, and Y as vertices.
- the chromaticities x and y of the yellow subpixel Y are outside the triangle surrounding the chromaticities x and y of the red subpixel R, the green subpixel G, and the blue subpixel B. is there. For this reason, the liquid crystal display device 100 can perform display in a wide color reproduction range.
- each of the opening areas S R , S G , S B , S Y of the red sub-pixel R, the green sub-pixel G, the blue sub-pixel B, and the yellow sub-pixel Y and
- the respective transmittances T R , T G , T B , and T Y of the red color filter CR, the green color filter CG, the blue color filter CB, and the yellow color filter CY are: T Y > [(S R + S G + S B + S Y ) (T R + T G + T B ) ⁇ 3 (S R ⁇ T R + S G ⁇ T G + S B ⁇ T B )] / 3S Y (A ) Satisfy the relationship.
- the transmittance means the ratio of the outgoing light intensity to the incident light intensity.
- the transmittances T R , T G , T B , and T Y change not only according to the color filters CR, CG, CB, and CY itself but also according to the spectrum of light incident on the color filter layer 280 and the like.
- the transmission spectra of the red, green, blue, and yellow color filters CR, CG, CB, and CY are equal, the emission spectrum of the backlight 300 and the incident surface on which light enters the liquid crystal panel 200
- the transmittances T R , T G , T B , and T Y change according to the wavelength dependency of the light transmittance of a member positioned between the color filter layer 280 and the like.
- the transmittance of members other than the red, green, blue, and yellow color filters CR, CG, CB, and CY in the liquid crystal panel 200 shows almost no wavelength dependency in the visible light region, so that red, green, and blue And yellow color filters CR, CG, CB, CY transmittances T R , T G , T B , TY are red, green, blue and yellow color filters CR, CG, CB, CY transmission spectra and backlight 300 It will change according to the emission spectrum.
- the red color filter layer 280, green, blue, and yellow color filters CR, CG, CB, the transmittance of the CY T R, T G, T B, by T Y have the above relationship,
- the transmittance of the color filter layer 280 can be made relatively high. For this reason, it is possible to perform display with high luminance without increasing power consumption and increasing the intensity of light emitted from the backlight 300.
- the (average) transmittance of one pixel of the color filter layer 280 is denoted by T ⁇ , and the area of one pixel is denoted by S ⁇ .
- T ⁇ the incident light intensity I IN incident on the color filter layer 280
- FIG. 4A shows a schematic diagram of a liquid crystal display device 500 of a comparative example.
- the liquid crystal display device 500 performs display with three primary colors of red, green, and blue.
- the liquid crystal display device 500 has the same configuration as the liquid crystal display device 100 described above, except that the yellow sub-pixel Y is not provided for each pixel P.
- the liquid crystal display device 500 includes a liquid crystal panel 600 and a backlight 700.
- the liquid crystal panel 600 includes a back substrate 620, a front substrate 640, and a liquid crystal layer 660 provided between the back substrate 620 and the front substrate 640. And a color filter layer 680.
- the color filter layer 680 is provided between the insulating substrate 642 and the counter electrode 644 of the front substrate 640. Note that the transmittance of the color filter layer 680 in the liquid crystal panel 600 is different from the transmittance of the color filter layer 280 in the liquid crystal panel 200, and the emission spectrum of the backlight 700 is different from the emission spectrum of the backlight 300.
- FIG. 4B shows a schematic plan view of the liquid crystal panel 600.
- each pixel P has a red sub-pixel r, a green sub-pixel g, and a blue sub-pixel b.
- the opening areas of the red sub-pixel r, the green sub-pixel g, and the blue sub-pixel b in one pixel are substantially equal to each other.
- the color filter layer 680 is provided with a red color filter Cr, a green color filter Cg, and a blue color filter Cb.
- the red color filter Cr, the green color filter Cg, and the blue color filter Cb in the color filter layer 680 are formed of the same material as the red color filter CR, the green color filter CG, and the blue color filter CB in the color filter layer 280 of the liquid crystal display device 100. Has been.
- FIG. 5A shows a chromaticity diagram comparing the color reproduction ranges of the liquid crystal display device 100 and the liquid crystal display device 500 of the present embodiment.
- R, G, B, and Y indicate chromaticities of red, green, blue, and yellow subpixels R, G, B, and Y in the liquid crystal display device 100, respectively, and r, g, and b are respectively The chromaticities of the red, green, and blue sub-pixels r, g, and b in the liquid crystal display device 500 are shown.
- the chromaticities of the red, green, and blue subpixels R, G, and B in the liquid crystal display device 100 are substantially equal to the chromaticities of the red, green, and blue subpixels r, g, and b in the liquid crystal display device 500, respectively.
- the chromaticity of the yellow subpixel Y at 100 is located outside the triangle connecting the chromaticities of the red, green, and blue subpixels R, G, and B. Therefore, the liquid crystal display device 100 can perform display in a wider color reproduction range than the liquid crystal display device 500.
- the description has been made with reference to the xy chromaticity diagram.
- the chromaticity of the yellow sub-pixel Y is the chromaticity of the red, green, and blue sub-pixels R, G, and B. Located outside the triangle connecting
- the transmittances of the color filter layer 280 in the liquid crystal display device 100 of the present embodiment and the color filter layer 680 in the liquid crystal display device 500 are compared.
- the transmittances of the red, green, and blue color filters Cr, Cg, and Cb in the color filter layer 680 are denoted as T r , T g , and T b , respectively.
- the transmittance is indicated as T ⁇ .
- the opening areas of the red sub-pixel r, the green sub-pixel g, and the blue sub-pixel b in the liquid crystal display device 500 are denoted as S r , S g , and S b , respectively, and the area of one pixel is denoted as S ⁇ .
- the average transmittance T ⁇ of the color filter layer 680 is expressed as (S r ⁇ T r + S g ⁇ T g + S b ⁇ T b ) / S ⁇ .
- the red, green, and blue color filters Cr, Cg, and Cb of the color filter layer 680 are formed of the same material as the red, green, and blue color filters CR, CG, and CB of the color filter layer 280. Therefore, the transmission spectra of the red color filter Cr, the green color filter Cg, and the blue color filter Cb show the same transmission spectra as the red color filter CR, the green color filter CG, and the blue color filter CB shown in FIG. Strictly speaking, the emission spectrum of the backlight 700 is different from the emission spectrum of the backlight 300, but the difference between the emission spectrum of the backlight 700 and the emission spectrum of the backlight 300 is very small.
- the emission spectrum is substantially equal to the emission spectrum of the backlight 300. Therefore, the transmittances T r , T g , and T b of the red, green, and blue color filters Cr, Cg, and Cb in the liquid crystal display device 500 are the same as the red, green, and blue color filters CR, CG, and CB in the liquid crystal display device 100.
- the area S ⁇ of one pixel in the liquid crystal display device 500 is equal to the area S ⁇ of one pixel in the liquid crystal display device 100.
- the area S ⁇ of the pixel P in the liquid crystal display device 500 is substantially equal to the area S ⁇ of the pixel P in the liquid crystal display device 100.
- the area of the light shielding region (for example, the region covered with the black matrix) in one pixel in the liquid crystal display device 100 is substantially equal to the area of the light shielding region in one pixel in the liquid crystal display device 500.
- the area of the light shielding region in one pixel in the liquid crystal display device 100 is the area of the light shielding region in one pixel in the liquid crystal display device 500. If the sum of the areas of the light shielding regions in the liquid crystal display devices 100 and 500 is sufficiently smaller than the sum of the entire opening areas, the difference in the sum of the areas of the light shielding regions in the liquid crystal display devices 100 and 500 can be ignored. There is no substantial problem, and it can be said that the sum of the opening areas in one pixel in the liquid crystal display device 100 is substantially equal to the sum of the opening areas in one pixel in the liquid crystal display device 500.
- the width of the black matrix in the liquid crystal display device 100 may be narrower than the width of the black matrix in the liquid crystal display device 500.
- the liquid crystal display device 100 of the present embodiment red, green, blue, and yellow sub-pixels R, G, B, and Y opening areas S R , S G , S B , S Y , and red, green, blue, and yellow
- the transmittances T R , T G , T B , and T Y of the color filters CR, CG, CB, and CY satisfy the inequality (A)
- the average transmittance T ⁇ of the color filter layer 280 in the liquid crystal display device 100 is the liquid crystal. It is set to be higher than the average transmittance T ⁇ of the color filter layer 680 in the display device 500. The details will be specifically described below.
- the average transmittance T ⁇ is expressed as (S R ⁇ T R + S G ⁇ T G + S B ⁇ T B + S Y ⁇ T Y ) / S ⁇
- the average transmittance T ⁇ is (S r ⁇ T since, denoted r + S g ⁇ T g + S b ⁇ T b) / S ⁇
- the transmittance T Y of the yellow color filter CY is, by satisfying the relationship, the transmittance of the color filter layer 280 is higher than the transmittance of the color filter layer 680 that is formed from the same material, high Luminance display can be easily realized.
- the opening areas S R , S G , S B , and S Y of the red, green, blue, and yellow sub-pixels are substantially equal to each other.
- the inequality (A) is T Y > (T R + T G + T B ) / 3 (B) It is expressed.
- the transmittance T Y of the yellow color filter CY is, red, green and blue color filters CR, CG, the transmittance of the CB T R, T G, the additive of T B
- the transmittance of the color filter layer 280 is higher than the transmittance of the color filter layer 680 formed of the same material, and the high Luminance display can be easily realized.
- the opening areas S R , S G , S B , and S Y of the four sub pixels that is, the red sub pixel R, the green sub pixel G, the blue sub pixel B, and the yellow sub pixel Y are substantially the same).
- each sub-pixel r in the liquid crystal display device 500, g, b of the opening area S r, S g, S b is the sub-pixels R in the liquid crystal display device 100, G, B, the opening area of the Y S R, S
- the ratio of the aperture area of the sub-pixel is larger than G 1 , S B and S Y
- FIG. 5B shows a graph showing the relationship between the NTSC ratio of the liquid crystal display device 100 and the liquid crystal display device 500 and the transmittance of the color filter layers 280 and 680.
- the transmittance is lowered.
- the chromaticity of the yellow sub-pixel Y is located outside the triangle connecting the chromaticities of the red, green, and blue sub-pixels R, G, and B, and the red sub-pixel R and green
- the respective aperture areas S R , S G , S B , S Y of the sub-pixel G, blue sub-pixel B and yellow sub-pixel Y , and the red color filter CR, green color filter CG, blue color filter CB and yellow color filter each of the transmittance T R of CY, T G, T B, since the T Y satisfies the above inequality (a), either NTSC ratio and the transmittance of the color filter layer 280 in the liquid crystal display device 100 in the liquid crystal display device 500 It is higher than the NTSC ratio and the transmittance of the color filter layer 680. For this reason, the liquid crystal display device 100 can perform high-luminance display in a wide color reproduction range.
- Table 1 shows the chromaticities x, y, u ′, v ′ of the red, green, and blue sub-pixels r, g, b in the liquid crystal display device 500 of the comparative example and the transmittance T of the corresponding color filters Cr, Cg, Cb. Indicates.
- Table 2 shows chromaticities x, y, u ′, and v ′ when yellow and white are displayed in the liquid crystal display device 500 of the comparative example.
- yellow is displayed by setting the blue sub-pixel to the lowest luminance and setting the red and green sub-pixels to the highest luminance.
- White is displayed by setting all sub-pixels to the maximum luminance.
- the color temperature of the liquid crystal display device 500 is 32000K.
- the transmittance of the color filter layer 680 is 31.9%.
- the NTSC ratio of CIE 1931 is 80.0%, and the NTSC ratio of CIE 1976 is 86.7%.
- Table 3 shows the chromaticities x, y, u ', v' of the red, green, blue and yellow sub-pixels and the transmittance T of the corresponding color filter in the liquid crystal display device 100 of the present embodiment.
- Table 4 shows chromaticities x, y, u ′, and v ′ when yellow and white are displayed in the liquid crystal display device 100 of the present embodiment.
- yellow is displayed by setting the blue subpixel to the lowest luminance and setting the red, green, and yellow subpixels to the highest luminance.
- White is displayed by setting all sub-pixels to the maximum luminance.
- the color temperature of the liquid crystal display device 100 is 7800K.
- the chromaticities of the red, green, and blue subpixels R, G, and B are the same as those of the liquid crystal display device 500, and the chromaticity of the yellow subpixel Y in the liquid crystal display device 100 is the red, green, and blue subpixels. It is located outside the triangle connecting the pixels R, G, and B. Therefore, the color reproduction range of the liquid crystal display device 100 is wider than that of the liquid crystal display device 500.
- the transmittances T R , T G , T B and T Y of the red, green, blue and yellow color filters CR, CG, CB and CY satisfy the above inequality (B).
- the transmittance of the color filter layer 280 is higher than the transmittance of the color filter layer 680.
- the transmittance of the color filter layer 280 in the liquid crystal display device 100 is 44.7%.
- the red sub-pixel R, the green sub-pixel G, the blue sub-pixel B, and the yellow sub-pixel Y are arranged in the row direction, but the present invention is not limited to this.
- the red sub-pixel R, the green sub-pixel G, the blue sub-pixel B, and the yellow sub-pixel Y may be arranged in a matrix of 2 rows and 2 columns.
- the opening areas S R , S G , S B , and S Y of the red, green, blue, and yellow sub-pixels R, G, B, and Y are equal, but the present invention is not limited to this. Not.
- the ratios of the opening areas S R , S G , S B , and S Y of the red, green, blue, and yellow sub-pixels R, G, B, and Y may be different.
- the opening area S R of the red sub-pixel R in the liquid crystal display device 100 is smaller than the opening area S r of the red sub-pixel r in the liquid crystal display device 500 of the comparative example. For this reason, the liquid crystal display device 100 may not be able to sufficiently express red with high brightness.
- the yellow sub-pixel Y is added to the liquid crystal panel 200 as compared with the liquid crystal panel 600, when the liquid crystal panel 200 and the backlight 700 are used in combination, the color temperature of the liquid crystal display device is lowered. In order to suppress such a decrease in the color temperature of the liquid crystal display device, if the color temperature of the light emitted from the backlight 300 is simply made higher than the color temperature of the light emitted from the backlight 700, the backlight 300 As a result, the luminous efficiency of the liquid crystal becomes lower.
- FIG. 7A shows a schematic diagram of the liquid crystal display device 100A.
- the liquid crystal display device 100A includes a liquid crystal panel 200A and a backlight 300A.
- the liquid crystal display device 100A is the above-described liquid crystal display device 100 except that the aperture areas S R , S G , S B , and S Y of the red, green, blue, and yellow subpixels R, G, B, and Y are not equal. In order to avoid redundancy, redundant description is omitted. Note that the transmittance of the color filter layer 280A in the liquid crystal panel 200A is different from the transmittance of the color filter layer 280 in the liquid crystal panel 200, but the emission spectrum of the backlight 300A is different from the emission spectrum of the backlight 300.
- FIG. 7B shows a schematic diagram of the liquid crystal panel 200A.
- the opening areas S R and S B of the red and blue sub-pixels R and B are larger than the opening areas S G and S Y of the green and yellow sub-pixels G and Y.
- the opening area S R of the red sub-pixel R is relatively large, red having high brightness can be sufficiently expressed.
- a relatively large opening area S B of the blue subpixel B it can suppress a reduction in luminous efficiency of the backlight 300A.
- the red, green, blue, and yellow subpixels R, G, B, and Y have the same length in the column direction, and the red, green, blue, and yellow subpixels R, G, B, and Y
- the ratio of the lengths in the direction is 1: 1: 1: 1, whereas the length in the row direction of the red and blue subpixels R and B is greater than the length in the row direction of the green and yellow subpixels G and Y.
- the ratio of the lengths in the row direction of red, green, blue, and yellow subpixels R, G, B, and Y is 1.6: 1.0: 1.6: 1.0. Therefore, the ratio of the opening areas S R , S G , S B , S Y of the red, green, blue and yellow subpixels R, G, B, Y is 1.6: 1.0: 1.6: 1. 0.
- FIG. 8 shows an emission spectrum of the backlight 300A.
- the backlight 300A includes blue light emitting and red / green fluorescent type LEDs.
- the peak of the radiation intensity corresponding to blue is higher than the radiation intensity corresponding to green and red, and the radiation corresponding to green.
- the intensity peak is higher than the radiant intensity corresponding to red.
- Table 5 shows the aperture ratio, chromaticity x, y, u ′, v ′ of the red, green, blue, and yellow subpixels R, G, B, and Y in the liquid crystal display device 100A of the present embodiment, and the corresponding color filter CR. , CG, CB, CY transmittance T.
- Table 6 shows chromaticities x, y, u ′, and v ′ when yellow and white are displayed in the liquid crystal display device 100A of the present embodiment.
- yellow is displayed by setting the blue sub pixel to the lowest luminance and setting the red, green and yellow sub pixels to the highest luminance.
- White is displayed by setting all sub-pixels to the maximum luminance.
- the color temperature of the liquid crystal display device 100A is 11600K.
- FIG. 9 shows a chromaticity diagram comparing the color reproduction ranges of the liquid crystal display device 100A and the liquid crystal display device 500 of the comparative example.
- R, G, B, and Y indicate chromaticities of red, green, blue, and yellow sub-pixels R, G, B, and Y in the liquid crystal display device 100A, respectively, and r, g, and b Respectively indicate the chromaticities of the red, green, and blue sub-pixels r, g, and b in the liquid crystal display device 500.
- the chromaticities of the red, green, and blue subpixels R, G, and B in the liquid crystal display device 100A are red, green, and blue subpixels r, g, and b in the liquid crystal display device 500. Is approximately equal to the chromaticity.
- FIG. 9B shows a partially enlarged view in which the vicinity of the chromaticity of the yellow sub-pixel Y is enlarged.
- the chromaticity of the yellow sub-pixel Y is positioned outside the triangle connecting the chromaticities of the red, green, and blue sub-pixels R, G, and B. Therefore, the color reproduction range of the liquid crystal display device 100A is wider than that of the liquid crystal display device 500 of the comparative example.
- the NTSC ratio of CIE 1931 is 80.0% and the NTSC ratio of CIE 1976 is 86.7%.
- the NTSC ratio of CIE 1931 is Is 81.7%, and the NTSC ratio of CIE 1976 is 88.8%.
- the NTSC ratio of the liquid crystal display device 100A is higher than that of the liquid crystal display device 500.
- the red, green, blue and yellow subpixels R, G, B, Y open areas S R , S G , S B , S Y and red, green, blue and yellow colors filter CR, CG, CB, the transmittance T R of CY, T G, T B, T Y is by satisfying the inequality (a), the transmittance of the color filter layer 280A rather than the transmittance of the color filter layer 680 high.
- the transmittance of the color filter layer 680 is 31.9%, but the transmittance of the large filter layer 280A in the liquid crystal display device 100A is 38.3%.
- the red sub-pixel R, the green sub-pixel G, the blue sub-pixel B, and the yellow sub-pixel Y are arranged in the row direction, but the present invention is not limited to this.
- the red sub-pixel R, the green sub-pixel G, the blue sub-pixel B, and the yellow sub-pixel Y may be arranged in a matrix of 2 rows and 2 columns.
- sub-pixels having a large opening area may be arranged along the column direction
- sub-pixels having a small opening area may be arranged along the column direction.
- the red subpixel R and the blue subpixel B may be arranged in the column direction
- the green subpixel G and the yellow subpixel Y may be arranged in the column direction.
- the red, green, blue, and yellow subpixels R, G, B, and Y have the same length in the column direction, and the red, green, blue, and yellow subpixels R, G, B, and Y have the same length.
- the length ratio in the column direction is 1: 1: 1: 1, while the length in the row direction of the red and blue subpixels R and B is the length in the row direction of the green and yellow subpixels G and Y. Longer than that.
- the ratio of the lengths in the row direction of red, green, blue, and yellow subpixels R, G, B, and Y is 1.6: 1.0: 1.6: 1.0.
- the ratio of S R , S G , S B , S Y is 1.6: 1.0: 1.6: 1.0.
- the opening area S R may be larger than the opening areas S G , S B and S Y.
- the opening area S B may be larger than the opening areas S R , S G , and S Y.
- the liquid crystal panels 200 and 200A in the liquid crystal display devices 100 and 100A are, for example, in the 4DRTN mode.
- the first alignment film 226 and the second alignment film 246 shown in FIGS. 1A and 7A each have a pretilt angle of liquid crystal molecules of less than 90 ° with respect to the surface of the vertical alignment film.
- the pretilt angle is an angle formed between the major surfaces of the first alignment film 226 and the second alignment film 246 and the major axis of the liquid crystal molecules defined in the pretilt direction.
- the first alignment film 226 and the second alignment film 246 define the pretilt direction of the liquid crystal molecules, respectively.
- a rubbing process, a photo-alignment process, a fine structure is formed in advance on the base of the alignment film, and the fine structure is reflected on the surface of the alignment film.
- a method or a method of forming an alignment film having a fine structure on the surface by obliquely depositing an inorganic substance such as SiO is known.
- rubbing treatment or photo-alignment treatment is preferable.
- the photo-alignment process is performed without contact, there is no generation of static electricity due to friction unlike the rubbing process, and the yield can be improved.
- the liquid crystal layer 260 is a vertical alignment type and has liquid crystal molecules having negative dielectric anisotropy. Due to the first alignment film 226 and the second alignment film 246, the liquid crystal molecules in the vicinity thereof are slightly inclined from the normal direction of the main surfaces of the first and second alignment films 226 and 246.
- the pretilt angle is, for example, not less than 85 ° and less than 90 °.
- the liquid crystal layer 260 does not have a chiral agent, and when a voltage is applied to the liquid crystal layer 260, the liquid crystal molecules in the liquid crystal layer 260 are twisted according to the alignment regulating force of the alignment films 226 and 246. However, a chiral agent may be added to the liquid crystal layer 260 as necessary.
- the liquid crystal layer 260 is combined with a polarizing plate arranged in a crossed Nicols state to display a normally black mode.
- pretilt direction of the liquid crystal molecules defined in the first alignment film 226 and the second alignment film 246 and the alignment direction of the liquid crystal molecules in the center of each liquid crystal domain in one pixel will be described with reference to FIG. To do.
- FIG. 11A shows the pretilt directions PA1 and PA2 of the liquid crystal molecules defined in the first alignment film 226 of the back substrate 220
- FIG. 11B shows the second alignment film of the front substrate 240
- the pretilt directions PB1 and PB2 of the liquid crystal molecules defined in H.246 are shown.
- FIG. 11C shows the alignment direction of the liquid crystal molecules in the center of the liquid crystal domains A to D when a voltage is applied to the liquid crystal layer 260, and regions (domain lines) DL1 to DL4 that appear dark due to the alignment disorder. Yes. Note that the domain lines DL1 to DL4 are not so-called disclination lines.
- FIG. 11A to FIG. 11C schematically show the alignment direction of the liquid crystal molecules when viewed from the observer side.
- 11 (a) to 11 (c) show that the end portions (substantially circular portions) of the cylindrical liquid crystal molecules are tilted toward the observer, and FIG. 11 (a) to FIG. In 11 (c), the inclination of the liquid crystal molecules with respect to the normal direction of the main surfaces of the first and second alignment films 226 and 246 is slight (that is, the tilt angle is relatively large).
- the pretilt angle in FIGS. 11A and 11B is, for example, not less than 85 ° and less than 90 °.
- the first alignment film 226 has a first alignment region OR1 and a second alignment region OR2.
- the liquid crystal molecules defined in the first alignment region OR1 are inclined in the ⁇ y direction with respect to the normal direction of the main surface of the first alignment film 226, and are defined in the second alignment region OR2 of the first alignment film 226.
- the liquid crystal molecules are inclined in the + y direction with respect to the normal direction of the main surface of the first alignment film 226.
- the second alignment film 246 includes a third alignment region OR3 and a fourth alignment region OR4.
- the liquid crystal molecules defined in the third alignment region OR3 are inclined in the + x direction with respect to the normal direction of the main surface of the second alignment film 246, and the end portion of the liquid crystal molecules in the ⁇ x direction faces the front side.
- the liquid crystal molecules defined in the fourth alignment region OR4 of the second alignment film 246 are inclined in the ⁇ x direction with respect to the normal direction of the main surface of the second alignment film 246, and the + x direction of the liquid crystal molecules is The end faces the front side.
- the first and second alignment films 226 and 246 are irradiated with ultraviolet rays obliquely.
- the liquid crystal molecules tilt in the same direction as the direction of ultraviolet irradiation. Therefore, by obliquely irradiating ultraviolet rays from the directions indicated by arrows PD1 to PD4, the liquid crystal molecules are aligned obliquely with respect to the normal direction of the main surfaces of the first and second alignment films 226 and 246.
- liquid crystal domains A, B, C, and D are formed in the liquid crystal layer 260.
- a portion sandwiched between the first alignment region OR1 of the first alignment film 226 and the third alignment region OR3 of the second alignment film 246 becomes the liquid crystal domain A, and the first alignment region of the first alignment film 226
- the portion sandwiched between OR1 and the fourth alignment region OR4 of the second alignment film 246 becomes the liquid crystal domain B, and is sandwiched between the second alignment region OR2 of the first alignment film 226 and the fourth alignment region OR4 of the second alignment film 246.
- the portion sandwiched between the second alignment region OR2 of the first alignment film 226 and the third alignment region OR3 of the second alignment film 246 becomes the liquid crystal domain D.
- the alignment direction of the liquid crystal molecules at the center of the liquid crystal domains A to D is an intermediate direction between the pretilt direction of the liquid crystal molecules by the first alignment film 226 and the pretilt direction of the liquid crystal molecules by the second alignment film 246.
- the orientation direction of liquid crystal molecules in the center of the liquid crystal domain, and the azimuth component in the direction from the back surface to the front surface along the major axis of the liquid crystal molecules is referred to as a reference alignment direction.
- the reference alignment direction characterizes the corresponding liquid crystal domain and has a dominant influence on the viewing angle dependence of each liquid crystal domain.
- the horizontal direction (left-right direction) of the display screen (paper surface) is taken as a reference for the azimuth angle direction, and the counterclockwise direction is taken positively.
- the reference alignment directions of the four liquid crystal domains A to D are set so that the difference between any two directions is four directions substantially equal to an integral multiple of 90 °.
- the azimuth angles of the liquid crystal domains A, B, C, and D are 225 °, 315 °, 45 °, and 135 °, respectively.
- the symmetrical reference orientation direction is realized, the viewing angle characteristics are made uniform and a good display can be obtained.
- the azimuth angles of the liquid crystal domains A, B, C, and D are 225 °, 315 °, 45 °, and 135 °, respectively, but the present invention is not limited to this.
- the reference alignment directions of the four liquid crystal domains A to D may be set so that the difference between any two directions is four directions substantially equal to an integral multiple of 90 °, and the liquid crystal domains A, B, C, Each of the azimuth angles D may indicate a different azimuth.
- the 4DRTN mode is described as an example of the liquid crystal display devices 100 and 100A, but the present invention is not limited to this.
- the liquid crystal display devices 100 and 100A may be liquid crystal display devices in other modes.
- LEDs are used as the backlights 300 and 300A, but the present invention is not limited to this.
- Cold cathode tubes Cold Cathode Fluorescent Lamp: CCFL
- CCFL Cold Cathode Fluorescent Lamp
- the color filter layer 280 is provided on the front substrate 240, but the present invention is not limited to this.
- the color filter layer 280 may be provided on the back substrate 220.
- the liquid crystal panels 200 and 200A are transmissive, but the present invention is not limited to this.
- the liquid crystal panels 200 and 200A may be of a reflective type.
- the transmittances T R , T G , red, green, blue and yellow color filters CR, CG, CB, CY, T B and T Y can be expressed as the square of the transmittance when the red, green, blue and yellow color filters CR, CG, CB and CY pass once. For example, when the transmittance when passing through the color filter once is 40%, the transmittance in the reflection type is 16%.
- both the transmission region and the reflection region may be provided, and the liquid crystal panels 200 and 200A may be of a transmission / reflection type.
- the transmittances T R , T G , T B , and T Y of the red, green, blue, and yellow color filters CR, CG, CB, and CY are the transmission area and transmission in the transmission area, respectively. It is represented by the sum of the product of the rate, the product of the area of the reflective region and the transmittance in the reflective region.
- the liquid crystal display device can expand the color reproduction range and suppress a decrease in the transmittance of the color filter layer.
Abstract
Description
TY > [(SR+SG+SB+SY)(TR+TG+TB)-3(SR×TR+SG×TG+SB×TB)]/3SY ・・・(A)
の関係を満たす。なお、以下の説明において、特に言及しない場合、透過率は、入射光強度に対する出射光強度の割合を意味する。透過率TR、TG、TB、TYはカラーフィルタCR、CG、CB、CY自体だけでなく、カラーフィルタ層280に入射する光のスペクトル等に応じて変化する。厳密には、仮に、赤、緑、青および黄カラーフィルタCR、CG、CB、CYの透過スペクトルが等しくても、バックライト300の出射スペクトルや、液晶パネル200内に光が入射する入射面とカラーフィルタ層280との間に位置する部材の光透過率の波長依存性等に応じて、透過率TR、TG、TB、TYは変化する。なお、一般に、液晶パネル200内の赤、緑、青および黄カラーフィルタCR、CG、CB、CY以外の部材の透過率は可視光領域においてほとんど波長依存性を示さないため、赤、緑、青および黄カラーフィルタCR、CG、CB、CYの透過率TR、TG、TB、TYは赤、緑、青および黄カラーフィルタCR、CG、CB、CYの透過スペクトルおよびバックライト300の出射スペクトルに応じて変化することになる。
(SR×TR+SG×TG+SB×TB+SY×TY)/Sα > (Sr×Tr+Sg×Tg+Sb×Tb)/Sβ
と表される。
(SR×TR+SG×TG+SB×TB+SY×TY) > (SR+SG+SB+SY)×(TR+TG+TB)/3
と変形可能であり、これは、
TY > [(SR+SG+SB+SY)(TR+TG+TB)-3(SR×TR+SG×TG+SB×TB)]/3SY
と表される。以上から、黄カラーフィルタCYの透過率TYが、上記関係を満たすことにより、カラーフィルタ層280の透過率は、同様の材料から形成されたカラーフィルタ層680の透過率よりも高くなり、高輝度の表示を簡便に実現することができる。
TY > (TR+TG+TB)/3 ・・・(B)
と表される。このため、本実施形態の液晶表示装置100では、黄カラーフィルタCYの透過率TYが、赤、緑および青カラーフィルタCR、CG、CBの透過率TR、TG、TBの相加平均(すなわち、(TR+TG+TB)/3)よりも高いことにより、カラーフィルタ層280の透過率は、同様の材料から形成されたカラーフィルタ層680の透過率よりも高くなり、高輝度の表示を簡便に実現することができる。なお、液晶表示装置100において4つのサブ画素(すなわち、赤サブ画素R、緑サブ画素G、青サブ画素Bおよび黄サブ画素Yの開口面積SR、SG、SB、SYが互いに略等しい場合、液晶表示装置500における各サブ画素r、g、bの開口面積Sr、Sg、Sbは液晶表示装置100における各サブ画素R、G、B、Yの開口面積SR、SG、SB、SYよりも大きく、サブ画素の開口面積の比は、SR:SG:SB:SY:Sr:Sg:Sb=3:3:3:3:4:4:4と表される。
200 液晶パネル
220 背面基板
222 絶縁基板
224 画素電極
226 第1配向膜
240 前面基板
242 絶縁基板
244 対向電極
246 第2配向膜
260 液晶層
280 カラーフィルタ層
300 バックライト
Claims (5)
- 赤サブ画素、緑サブ画素、青サブ画素および黄サブ画素を有する画素を含む液晶表示装置であって、
バックライトと、
液晶パネルと
を備えており、
前記液晶パネルは、前記赤サブ画素に対応する赤カラーフィルタと、前記緑サブ画素に対応する緑カラーフィルタと、前記青サブ画素に対応する青カラーフィルタと、前記黄サブ画素に対応する黄カラーフィルタとを含むカラーフィルタ層を有しており、
前記黄サブ画素の色度は前記赤サブ画素、前記緑サブ画素および前記青サブ画素の色度を結んだ三角形の外側にあり、
前記赤サブ画素、前記緑サブ画素、前記青サブ画素および前記黄サブ画素のそれぞれの開口面積SR、SG、SB、SY、ならびに、前記赤カラーフィルタ、前記緑カラーフィルタ、前記青カラーフィルタおよび前記黄カラーフィルタのそれぞれの透過率TR、TG、TB、TYは、
TY > [(SR+SG+SB+SY)(TR+TG+TB)-3(SR×TR+SG×TG+SB×TB)]/3SY
の関係を満たす、液晶表示装置。 - 前記赤サブ画素、前記緑サブ画素、前記青サブ画素および前記黄サブ画素のうちの少なくとも1つの開口面積は、他のサブ画素のうちの何れかのサブ画素の開口面積とは異なる、請求項1に記載の液晶表示装置。
- 前記赤サブ画素の開口面積は、前記緑サブ画素および前記黄サブ画素の開口面積よりも大きく、
前記青サブ画素の開口面積は、前記緑サブ画素および前記黄サブ画素の開口面積よりも大きい、請求項1に記載の液晶表示装置。 - 前記赤サブ画素、前記緑サブ画素、前記青サブ画素および前記黄サブ画素の開口面積は互いに略等しい、請求項1に記載の液晶表示装置。
- 前記黄カラーフィルタの透過率は、前記赤カラーフィルタ、前記緑カラーフィルタおよび前記青カラーフィルタの透過率の相加平均よりも高い、請求項4に記載の液晶表示装置。
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CN201080043882.XA CN102576165B (zh) | 2009-09-30 | 2010-09-27 | 液晶显示装置 |
JP2011534230A JP5329671B2 (ja) | 2009-09-30 | 2010-09-27 | 液晶表示装置 |
RU2012117744/28A RU2499289C1 (ru) | 2009-09-30 | 2010-09-27 | Жидкокристаллическое устройство отображения |
BR112012007108A BR112012007108A2 (pt) | 2009-09-30 | 2010-09-27 | dispositivo de exibição de cristal líquido |
KR1020127010551A KR101344641B1 (ko) | 2009-09-30 | 2010-09-27 | 액정 표시 장치 |
EP10820485.0A EP2485083A4 (en) | 2009-09-30 | 2010-09-27 | LIQUID CRYSTAL DISPLAY DEVICE |
US13/497,369 US8692960B2 (en) | 2009-09-30 | 2010-09-27 | Liquid crystal display device |
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US10768469B2 (en) * | 2017-04-28 | 2020-09-08 | Japan Display Inc. | Active matrix display device |
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CN102576165A (zh) | 2012-07-11 |
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US8692960B2 (en) | 2014-04-08 |
US20120188480A1 (en) | 2012-07-26 |
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