JP2006163425A - Display device and electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device with an excellent image representation capability, which is capable of vividly reproducing colors existing in nature. <P>SOLUTION: The display device performs color reproduction by additive color mixture of four primary colored light components consisting of red, green, blue, and cyan, wherein in an xy-chromaticity diagram, the coordinate of red is x≥0. 643 (y is any value), green is y≥0.606 (x is any value), blue is y≤0. 056 (x is optional), and cyan is x≤0.164 (y is any value). Or, in a u'v'-chromaticity diagram, the coordinate of red is u'≥0.450 (v' is any value), green is v'≥0.569 (u' is any value), blue is v'≤0.149 (u' is any value), and cyan is u'≤0.076 (v' is any value). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a display device and an electronic apparatus, and more particularly to a technique for improving display color reproducibility.

  In color image display devices such as liquid crystal displays and organic electroluminescence (hereinafter abbreviated as EL) displays, the additive color mixture of the three primary colors of red (R), green (G), and blue (B) is usually used. Various colors are reproduced. In this case, the reproducible color range (color reproduction range) in the image display is limited to a region expressed as the sum of color vectors of the three primary colors in a three-dimensional color space. In recent years, image display devices have improved the ability to express images with the diversification of applications, and for example, the expression of subtle shades is required. In other words, it is required to expand the color reproduction range. One means for increasing the color reproduction range is to increase the saturation of the primary colors. However, in order to increase the saturation of the primary color, it is necessary to narrow the wavelength range of the primary color and bring it closer to monochromatic light. Therefore, unless a special light source such as laser light is used, the light use efficiency is lowered.

Thus, attempts have been made to expand the color reproduction range by increasing the number of primary colors used for display. For example, Patent Document 1 below discloses a video display device using four primary colors. In this video display device, R, G, and B primary colors among the four primary colors are matched with sRGB chromaticity, which is one of the standard color spaces, and a color reproduction range is obtained by adding cyan (C) color. Is expanding.
JP 2003-228360 A

  However, in the video display device described in Patent Document 1, the R, G, and B chromaticities of the four primary colors are matched with the sRGB chromaticity, and therefore, a color that exists in nature, for example, a color called PointerGamut Does not contain enough area. Since the cyan color is added, the color reproduction range is an area surrounded by a quadrangle, which is of course better than sRGB itself. For example, in the Red-Yellow-Green area and the Red-Magenta-Blue area. Does not include PointerGamut.

  FIG. 24 is a u′v ′ chromaticity diagram showing the color reproduction range of the video display device described in Patent Document 1. In this figure, in addition to the color reproduction range of the video display device, PointerGamut which is a database of colors existing in nature and the color reproduction range of the standard color space sRGB are shown. Since the color gamut of sRGB originally does not include PointerGamut, cyan is added. Therefore, PointerGamut is included around the added cyan color. On the other hand, since R, G, and B are primary colors of sRGB, the Red-Yellow-Green region and the Red-Magenta-Blue region do not include PointerGamut. For this reason, there has been a problem that vivid colors cannot be reproduced in these regions, and colors defined in PointerGamut cannot be faithfully reproduced.

  The present invention has been made to solve the above-described problems, and in particular, a display device that can faithfully reproduce colors existing in the natural world and has excellent image expressive power, and an electronic device using the same The purpose is to provide equipment.

  In order to achieve the above object, the present inventors assume a liquid crystal display device having a color filter and a backlight, or a combination of a color filter and an organic EL device, and exhibit various different spectral characteristics. The color gamut that can be expressed for the combination of the color filter and the backlight is obtained by simulation. As a result, the color gamut surrounded by a rectangle connecting the coordinates of the four primary colors of red, green, blue, and cyan is a database of natural colors called PointerGamut (MRPointer, The Gamut of Real Surface Colors, COLOR Research and Application , Vol.5 Num.3, pp.145-155, 1980), the coordinates of each primary color were limited. Here, PointerGamut is a database in which color charts (color samples) and the like are measured, and those with high saturation are collected for each hue. Since highly saturated ones are collected, they are often used for evaluation of color gamut.

That is, the display device of the present invention is a display device that performs color display by emitting red, blue, and first and second color lights, and the coordinates of the first color in the xy chromaticity diagram. Is in the range of 0.257 ≦ x ≦ 0.357 and 0.606 ≦ y ≦ 0.653, and the coordinates of the second color are 0.098 ≦ x ≦ 0.164 and 0.453 ≦ y ≦ 0. .494 range.
Although details will be described later as a specific example, according to this configuration, since the color reproduction range in this display device includes PointerGamut, colors existing in the natural world can be faithfully reproduced, and the expressive power of the image can be improved. Can be increased.

The display device of the present invention is a display device that performs color display by emitting red, blue, and first and second color lights, and in the u′v ′ chromaticity diagram, The color coordinates are 0.100 ≦ u ′ ≦ 0.150, 0.569 ≦ v ′ ≦ 0.574, and the second color coordinates are 0.046 ≦ u ′ ≦ 0.076, 0.499 ≦ v. It is characterized by being in the range of '≦ 0.517.
While the above configuration is expressed by an xy chromaticity diagram, this configuration is expressed by a u′v ′ chromaticity diagram. Even in this configuration, since the color reproduction range in this display device includes PointerGamut, colors existing in the natural world can be faithfully reproduced, and the expressiveness of the image can be further enhanced. The upper limit or lower limit of the coordinates in the u'v 'chromaticity diagram of this configuration is obtained from five specific examples described later, and is the upper or lower limit value when expressed in the above xy chromaticity diagram system. Is not directly converted into the u'v 'chromaticity diagram system.

The display device of the present invention includes a color filter having a color material layer having different wavelength selection characteristics, a backlight that emits illumination light having a plurality of peak wavelengths, and a liquid crystal cell that controls the illumination light transmitted through the color filter. And may be provided.
According to this configuration, since the color reproduction range includes PointerGamut, colors existing in the natural world can be faithfully reproduced, and a liquid crystal display device with higher image expressive power can be realized.

  In the liquid crystal display device including a color filter and a backlight, the color filter has a peak wavelength of 400 to 490 nm for blue transmitted light, a peak wavelength of 490 to 520 nm for cyan transmitted light, and a peak wavelength for green transmitted light. Having a spectral characteristic of 520 to 570 nm and a peak wavelength of 600 nm or more with respect to red transmitted light, and the backlight includes a light emitting diode of three colors and has a spectral characteristic including peak wavelengths of 460 nm, 540 nm, and 640 nm. Also good.

  Alternatively, the color filter has a peak wavelength for blue transmitted light of 400 to 490 nm, a peak wavelength for cyan transmitted light of 490 to 520 nm, a peak wavelength of green transmitted light of 520 to 570 nm, and a peak wavelength of red transmitted light of 600 nm or more. The backlight may include a three-color wavelength fluorescent tube and have spectral characteristics including peak wavelengths of 435 nm, 545 nm, and 630 nm.

  Alternatively, the color filter has a peak wavelength for blue transmitted light of 400 to 490 nm, a peak wavelength for cyan transmitted light of 490 to 520 nm, a peak wavelength of green transmitted light of 520 to 570 nm, and a peak wavelength of red transmitted light of 600 nm or more. In addition, the backlight may include three color light emitting diodes and have spectral characteristics including peak wavelengths of 465 nm, 520 nm, and 635 nm.

  Alternatively, the color filter has a peak wavelength for blue transmitted light of 400 to 490 nm, a peak wavelength for cyan transmitted light of 490 to 520 nm, a peak wavelength of green transmitted light of 520 to 570 nm, and a peak wavelength of red transmitted light of 600 nm or more. It is sufficient that the backlight has a three-color wavelength fluorescent tube and spectral characteristics including peak wavelengths of 435 nm, 545 nm, and 610 nm.

The display device of the present invention may include a color filter having colorant layers having different wavelength selection characteristics and an organic electroluminescence device that emits light having a plurality of peak wavelengths. Further, the light emitting portion of the organic electroluminescence device has a white light emitting layer that emits white light, the colored portion corresponding to the red, the colored portion corresponding to the blue, and the first color of the color filter. It is good also as what obtains the said color light with the combination of each of the corresponding coloring part and the coloring part corresponding to said 2nd color, and said white light emitting layer. Alternatively, the light emitting unit of the organic electroluminescence device includes a red light emitting layer that emits red light, a green light emitting layer that emits green light, and a blue light emitting layer that emits blue light, A combination of a colored portion corresponding to red and a red light emitting layer of the light emitting portion, a combination of a colored portion corresponding to blue of the color filter and a blue light emitting layer of the light emitting portion, and the first of the color filter. A combination of a colored portion corresponding to a color and a green light emitting layer of the light emitting portion, and a combination of a colored portion corresponding to the second color of the color filter and a green light emitting layer of the light emitting portion to obtain the color light Also good.
According to this configuration, since the color reproduction range includes PointerGamut, colors existing in the natural world can be faithfully reproduced, and an organic EL device with higher image expressive power can be realized.

An electronic apparatus of the present invention includes the display device of the present invention or the liquid crystal display device of the present invention.
According to this configuration, an electronic apparatus having a display unit with excellent color reproducibility can be realized by including the display device of the present invention or the liquid crystal display device of the present invention.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
In the present embodiment, an example of application of the present invention to an active matrix transflective liquid crystal display device using a TFT (Thin-Film Transistor) element as a switching element is shown. FIG. 1 is an exploded schematic perspective view showing the overall configuration of the transflective liquid crystal display device of this embodiment.
As shown in FIG. 1, the liquid crystal display device 3 of the present embodiment includes a color filter substrate 80 and an element substrate (counter substrate) 90 that are disposed to face each other with a liquid crystal layer (not shown) interposed therebetween. And a backlight (not shown) disposed on the side opposite to the viewing side of the liquid crystal panel.

  The element substrate 90 is schematically configured by forming a TFT element 94, a pixel electrode 95, and the like on the surface of the substrate body 91 on the liquid crystal layer side, and forming an alignment film (not shown) on the liquid crystal layer side. More specifically, in the element substrate 90, a large number of data lines 92 and a large number of scanning lines 93 are provided on the surface of the substrate body 91 so as to cross each other. A TFT element 94 is formed in the vicinity of the intersection of each data line 92 and each scanning line 93, and a pixel electrode 95 is connected to each data line 92 via each TFT element 94. When the entire surface of the element substrate 90 on the liquid crystal layer side is viewed, a large number of pixel electrodes 95 are arranged in a matrix, and the area where each pixel electrode 95 is formed in the liquid crystal display device 3 is an individual dot. On the other hand, the color filter substrate 80 includes a transflective layer 12, a color filter 13 having colored portions 13R, 13G, 13B, and 13C, a light shielding layer 15, and an overcoat layer (on the liquid crystal layer side surface of the substrate body 11). (Not shown), a common electrode 81, and an alignment film (not shown) are formed and roughly configured.

  In the present embodiment, the color filter 13 has four colored portions, that is, a red coloring portion 13R, a green coloring portion 13G, a blue coloring portion 13B, and a cyan coloring portion 13C, and R, G, B, C These four dots constitute one pixel. In other words, color display color reproduction is performed by additive color mixing of four primary color lights including red (R), green (G), blue (B), and cyan (C). Therefore, the liquid crystal display device according to the present embodiment has a wider color reproduction range than that in which color display is performed with three colors of R, G, and B.

  FIG. 2 is an xy chromaticity diagram showing the color gamut of the liquid crystal display device of this embodiment. The xy coordinate values that each primary color of R, G, B, and C can take are in a range surrounded by a broken-line quadrangle in FIG. That is, as shown in [Table 1] below, R coordinates are 0.643 ≦ x ≦ 0.690, 0.299 ≦ y ≦ 0.333, and G coordinates are 0.257 ≦ x ≦ 0.357. 0.606 ≦ y ≦ 0.653, C coordinates are 0.098 ≦ x ≦ 0.164, 0.453 ≦ y ≦ 0.494, B coordinates are 0.134 ≦ x ≦ 0.151, 0 0.04 ≦ y ≦ 0.056 in the chromaticity range.

  Similarly, FIG. 3 shows the color gamut of the liquid crystal display device of this embodiment in a u′v ′ chromaticity diagram. The u′v ′ coordinate values that can be taken by each of the primary colors R, G, B, and C are in a range surrounded by a broken-line rectangle in FIG. That is, as shown in [Table 2] below, R coordinates are 0.450 ≦ u ′ ≦ 0.530, 0.517 ≦ v ′ ≦ 0.525, and G coordinates are 0.100 ≦ u ′ ≦. 0.150, 0.569 ≦ v ′ ≦ 0.574, C coordinates are 0.046 ≦ u ′ ≦ 0.076, 0.499 ≦ v ′ ≦ 0.517, B coordinates are 0.158 ≦ u It is in the chromaticity range of “≦ 0.194, 0.099 ≦ v” ≦ 0.149.

  2 and 3, the color gamut that can be expressed by the coordinates of the three primary colors of sRGB is indicated by a dashed triangle. On the other hand, the coordinates of the three primary colors RGB in the liquid crystal display device of the present embodiment are located on the outer side of the chromaticity diagram than the coordinates of the three primary colors sRGB, and are expressed by adding C color. A possible color reproduction area is an area surrounded by a solid quadrilateral. This quadrangle is a quadrangle that sets a representative primary color in a coordinate range that each primary color can take and connects the representative primary colors. Therefore, the color gamut surrounded by the rectangle is merely an example, but as shown in FIG. 3, the sRGB triangle does not include a part of PointerGamut, whereas the color gamut of the present embodiment The quadrangle will contain PointerGamut. Therefore, the liquid crystal display device according to the present embodiment can reproduce all of the colors defined by PointerGamut, that is, can faithfully reproduce colors existing in the natural world, and can further enhance image expressive power.

  Looking at the color reproduction range of sRGB in detail, the area that does not contain PointerGamut is large: (1) Red-Yellow-Green area (upper side of inverted triangle in u'v 'chromaticity diagram), (2) Red-Magenta- A blue region (right side of inverted triangle in u'v 'chromaticity diagram) and (3) Green-Cyan-Blue region (left side of inverted triangle in u'v' chromaticity diagram) are divided into three. Here, when viewing the video display device of Patent Document 1, as shown in FIG. 24, the region (3) is included by adding cyan. However, since the primary colors of R, G, and B other than cyan are set to be the same as that of sRGB, the regions (1) and (2) are not included. On the other hand, as described above, the color reproduction range of the liquid crystal display device of the present embodiment also includes the areas (1) and (2) of PointerGamut, so that it is brighter than the video display device of Patent Document 1. Color can be reproduced.

  However, in this embodiment, the x coordinate on the xy chromaticity diagram, the upper and lower limits of the y coordinate, the u ′ coordinate on the u′v ′ chromaticity diagram, and the upper and lower limits of the v ′ coordinate are all defined, and each primary color is defined. The coordinate value is set in a range surrounded by a broken-line quadrangle in FIGS. However, even if not all of these are specified, in the xy chromaticity diagram, at least the coordinates of R are x ≧ 0.643, the coordinates of G are y ≧ 0.606, the coordinates of B are y ≦ 0.056, and the coordinates of C If x satisfies 0.1 ≦ 0.164, PointerGamut is included, and the above effect can be obtained. Similarly, in the u′v ′ chromaticity diagram, at least the R coordinate is u ′ ≧ 0.450, the G coordinate is v ′ ≧ 0.569, the B coordinate is v ′ ≦ 0.149, and the C coordinate is If u ′ ≦ 0.076 is satisfied, PointerGamut is included, and the above effect can be obtained.

Note that PointerGamut is shown only in FIG. 3 of the u′v ′ chromaticity diagram and not shown in FIG. 2 of the xy chromaticity diagram. The reason is that the xy chromaticity diagram is known to have a distance on the diagram that does not match the difference due to human perception, and is not suitable for evaluating the color inclusion relationship. On the other hand, the u′v ′ chromaticity diagram is defined in order to improve the non-uniformity of the chromaticity diagram, and is suitable for evaluating the color inclusion relationship. For this reason, PointerGamut is shown only on the u'v 'chromaticity diagram. The original data in the paper describing PointerGamut is given saturation according to lightness for each hue, but in FIG. 3, the maximum saturation is plotted for each hue regardless of lightness. Further, the u ′ coordinate and the v ′ coordinate can be obtained from the x coordinate and the y coordinate based on the following equations (1) and (2).
u ′ = 4x / (− 2x + 12y + 3) (1)
v ′ = 9y / (− 2x + 12y + 3) (2)

  2 and 3, the reason why the xy chromaticity or u′v ′ chromaticity is specified by defining the range for each of the primary colors R, G, B, and C is that the color filters and backs constituting the liquid crystal display device are used. This is because there is a certain degree of freedom in the xy chromaticity or u′v ′ chromaticity of each primary color depending on the spectral characteristics of the light. Therefore, in the following, specific examples of various color filters and backlights will be given as examples, and xy chromaticity and u′v ′ chromaticity when using a combination of the color filters and backlight will be shown. The above ranges (lower limit, upper limit) are values based on the following five examples.

[Example 1]
4 to 7 show the xy chromaticity and u′v ′ chromaticity of each of the primary colors of R, G, B, and C when using the color filter, the backlight, and these. 4 shows the spectral characteristics of the color filter, FIG. 5 shows the spectral characteristics of the backlight, FIG. 6 shows the xy chromaticity diagram, and FIG. 7 shows the u′v ′ chromaticity diagram. 6 and 7, the sRGB color reproduction range is also shown for comparison. Further, in order to confirm the color inclusion relationship, FIG. 7 also shows PointerGamut. As is well known, the liquid crystal display device is composed of many members other than the color filter and the backlight, but the color filter and the backlight greatly contribute to the color reproducibility. For this reason, only the spectral characteristics of the color filter and the backlight are shown here.

  In Example 1, as a color filter, as shown in FIG. 4, the peak wavelength for B light is 400 to 490 nm, the peak wavelength for C light is 490 to 520 nm, the peak wavelength for G light is 520 to 570 nm, and the peak is for R light. The thing with the spectral characteristic whose wavelength is 600 nm or more was used. Moreover, as a backlight, what was equipped with LED of 3 colors was used, and as shown in FIG. 5, the peak wavelength of each LED used what is 460 nm of blue, 540 nm of green, and 640 nm of red.

  As a result of the simulation using the color filter and the backlight, the xy chromaticity and u′v ′ chromaticity of each primary color are obtained as shown in FIGS. 6 and 7 (specific coordinate values). [Refer to [Table 3] and [Table 4].) A color reproduction range indicated by a quadrilateral connecting the primary colors was obtained. In particular, as shown in FIG. 7, the color gamut of Example 1 includes almost all PointerGamut. Therefore, more vivid colors can be reproduced as compared with sRGB and the video display device disclosed in Patent Document 1.

[Example 2]
FIG. 8 to FIG. 11 show the xy chromaticity and u′v ′ chromaticity of each of the primary colors of R, G, B, and C when using the color filter, the backlight, and these. 8 shows the spectral characteristic of the color filter, FIG. 9 shows the spectral characteristic of the backlight, FIG. 10 shows the xy chromaticity diagram, and FIG. 11 shows the u′v ′ chromaticity diagram. 10 and 11, the sRGB color reproduction range is also shown for comparison. Furthermore, PointerGamut is also shown in FIG. 11 in order to confirm the color inclusion relationship.

  In Example 2, the same color filter as in Example 1 was used as shown in FIG. On the other hand, unlike Example 1, the backlight used was equipped with a fluorescent tube having peak colors of three colors. As shown in FIG. 9, the peak wavelengths used were blue at 435 nm, green at 545 nm, and red at 630 nm.

  As a result of the simulation using the above-described setting using the color filter and the backlight, as shown in FIGS. 10 and 11, the xy chromaticity and u′v ′ chromaticity of each primary color are obtained (specific coordinate values). [Refer to [Table 5] and [Table 6].) A color gamut indicated by a quadrilateral connecting the primary colors was obtained. In particular, as shown in FIG. 11, the color gamut of Example 2 includes almost all PointerGamut. Therefore, even when a three-color wavelength fluorescent tube type backlight is used, a more vivid color can be reproduced as compared with sRGB and the video display device disclosed in Patent Document 1.

[Example 3]
FIG. 12 to FIG. 15 show the xy chromaticity and u′v ′ chromaticity of each of the primary colors of R, G, B, and C when using the color filter, the backlight, and these. 12 shows the spectral characteristics of the color filter, FIG. 13 shows the spectral characteristics of the backlight, FIG. 14 shows the xy chromaticity diagram, and FIG. 15 shows the u′v ′ chromaticity diagram. 14 and 15 also show the sRGB color reproduction range for comparison. Further, FIG. 15 also shows PointerGamut in order to confirm the color inclusion relationship.

  In Example 3, the same color filter as in Example 1 was used as shown in FIG. On the other hand, as in Example 1, a backlight including three colors of LEDs was used, but a backlight having a peak wavelength different from that in Example 1 was used. That is, as shown in FIG. 13, the peak wavelength of each LED used was 465 nm for blue, 520 nm for green, and 635 nm for red (in Example 1, 460 nm, 540 nm, and 640 nm).

  As a result of the simulation using the color filter and the backlight, the xy chromaticity and u′v ′ chromaticity of each primary color are obtained as shown in FIGS. 14 and 15 (specific coordinate values). [Refer to [Table 7] and [Table 8].) A color reproduction range indicated by a quadrilateral connecting the primary colors was obtained. In particular, as shown in FIG. 15, the color gamut of Example 3 is (1) Red-Yellow-Green region (upper side of inverted triangle in u′v ′ chromaticity diagram) compared to Examples 1 and 2. Is slightly narrower. However, compared with the color reproduction gamut of sRGB, (2) Red-Magenta-Blue region (right side of inverted triangle in u'v 'chromaticity diagram), (3) Green-Cyan-Blue region (u'v 'Left side of inverted triangle in chromaticity diagram) contains more PointerGamut. Therefore, even when a three-color LED type backlight having different peak wavelengths is used (a single LED is changed), more vivid colors can be reproduced as compared with sRGB and the video display device of Patent Document 1. .

[Example 4]
FIG. 16 to FIG. 19 show the xy chromaticity and u′v ′ chromaticity of each of the primary colors of R, G, B, and C when using the color filter, the backlight, and these. 16 shows the spectral characteristics of the color filter, FIG. 17 shows the spectral characteristics of the backlight, FIG. 18 shows the xy chromaticity diagram, and FIG. 19 shows the u′v ′ chromaticity diagram. 18 and 19 also show the sRGB color reproduction range for comparison. Furthermore, PointerGamut is also shown in FIG. 19 in order to confirm the color inclusion relationship.

  In Example 4, the same color filter as in Example 1 was used as shown in FIG. On the other hand, the backlight used was a three-color wavelength fluorescent tube type as in Example 2, but a backlight having a peak wavelength different from that in Example 2 was used. That is, as shown in FIG. 17, each peak wavelength is the same as that in Example 2 in that blue is 435 nm and green is 545 nm, but red is 610 nm (red in Example 2 is red). 630 nm).

  As a result of the simulation using the above-described setting using the color filter and the backlight, the xy chromaticity and u′v ′ chromaticity of each primary color are obtained as shown in FIGS. 18 and 19 (specific coordinate values). [Table 9] and [Table 10]), a color gamut represented by a quadrilateral connecting the primary colors was obtained. In particular, as shown in FIG. 19, the color gamut of Example 4 is (2) Red-Magenta-Blue region (right side of inverted triangle in u'v 'chromaticity diagram) as compared with Examples 1 and 2. Is slightly narrower. In addition, when the primary color of Green is seen, it does not include Green of sRGB. These are caused by the spectral characteristics of the color filter and the backlight set in the fourth embodiment. However, from the viewpoint of whether or not PointerGamut is included, (1) Red-Yellow-Green region (upper side of inverted triangle in u'v 'chromaticity diagram), (3) Green-Cyan-Blue region (u Any of the left side portions of the inverted triangle in the “v” chromaticity diagram) includes more PointerGamut than the sRGB color reproduction range. Therefore, even when using a three-color wavelength fluorescent tube type backlight having a different peak wavelength (changing the fluorescent material), the color defined in PointerGamut is different from that of the image display device of sRGB or Patent Document 1. It can be reproduced more faithfully.

[Example 5]
FIG. 20 to FIG. 23 show the xy chromaticity and u′v ′ chromaticity of the primary colors of R, G, B, and C when these are used, and the color filter and backlight of Example 5. 20 shows the spectral characteristics of the color filter, FIG. 21 shows the spectral characteristics of the backlight, FIG. 22 shows the xy chromaticity diagram, and FIG. 23 shows the u′v ′ chromaticity diagram. 22 and 23, the sRGB color reproduction range is also shown for comparison. Furthermore, PointerGamut is also shown in FIG. 23 to confirm the color inclusion relationship.

  In Example 5, the same backlight as in Example 4 was used as shown in FIG. On the other hand, a color filter different from those in Examples 1 to 4 was used. That is, as shown in FIG. 20, the characteristics of the blue color filter are different from those of Examples 1 to 4, and the peak is shifted to the long wavelength side (about 460 nm) and the transmittance is improved. The characteristic of the color filter is different because the additive color material is different.

  As a result of the simulation with the setting using the color filter and the backlight, as shown in FIGS. 22 and 23, the xy chromaticity and u′v ′ chromaticity of each primary color are obtained (specific coordinate values). [Refer to [Table 11] and [Table 12]), a color gamut indicated by a quadrilateral connecting the primary colors was obtained. In particular, as shown in FIG. 23, the color gamut of Example 5 is (2) Red-Magenta-Blue region (right side of an inverted triangle in the u'v 'chromaticity diagram) as compared to Examples 1 and 2. Is equivalent to sRGB. In addition, when the primary color of Green is seen, it does not include Green of sRGB. These are caused by the spectral characteristics of the color filter and the backlight set in the fifth embodiment. However, from the viewpoint of whether or not PointerGamut is included, (2) Red-Magenta-Blue region is equivalent to sRGB, but (1) Red-Yellow-Green region (u'v 'chromaticity diagram) (3) Green-Cyan-Blue region (left side of inverted triangle in u'v 'chromaticity diagram) contains more PointerGamut than sRGB color gamut. Yes. For these reasons, even when the color filter is changed, the color defined in PointerGamut can be reproduced more faithfully than sRGB or the video display device disclosed in Patent Document 1.

[Example 6]
FIG. 26 to FIG. 29 show the xy chromaticity and u′v ′ chromaticity of each of the primary colors of R, G, B, and C when using the color filter, the backlight, and these. 26 shows the spectral characteristics of the color filter, FIG. 27 shows the spectral characteristics of the backlight, FIG. 28 shows the xy chromaticity diagram, and FIG. 29 shows the u′v ′ chromaticity diagram. 28 and 29, the sRGB color reproduction range is also shown for comparison. Furthermore, PointerGamut is also shown in FIG. 29 in order to confirm the color inclusion relationship.

  In Example 6, a backlight with wavelength conversion was used. That is, as shown in FIG. 27, by irradiating the phosphor with light having an original peak wavelength of 450 nm, part of the light with a peak wavelength of 450 nm is converted into light with a relatively broad luminance distribution with a peak wavelength of 565 nm. It is a thing. As a result, both have a peak wavelength of 450 nm before conversion and a peak wavelength of 565 nm after conversion. On the other hand, a color filter different from those in Examples 1 to 5 was used. That is, as shown in FIG. 26, the transmittance of the blue color filter is higher than that of the other examples and is almost equal to that of cyan. The characteristic of the color filter is different because the additive color material is different.

  As a result of the simulation using the above-described settings using the color filter and the backlight, as shown in FIGS. 28 and 29, the xy chromaticity and u′v ′ chromaticity of each primary color are obtained (specific coordinate values). [Refer to [Table 13] and [Table 14]), a color gamut indicated by a rectangle connecting the primary colors was obtained. In particular, as shown in FIG. 29, the color gamut of Example 6 includes sRGB and further includes PointerGamut except for a small portion of the Red-Magenta-Blue region. For these reasons, even when a backlight with wavelength conversion is used, the color defined by PointerGamut can be reproduced more faithfully than sRGB or the video display device disclosed in Patent Document 1.

[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described with reference to FIG.
In the present embodiment, an application example of the present invention to an active matrix bottom emission type organic EL device using a TFT element as a switching element will be described.
FIG. 30 is a cross-sectional view showing the overall configuration of the organic EL device of this embodiment.

  As shown in FIG. 30, the organic EL device 20 of the present embodiment is generally configured by a glass substrate 21, a TFT element 22 and a light emitting unit 23 formed on the glass substrate 21, and a sealing substrate 24. . Specifically, the TFT element 22 is formed on the glass substrate 21, and the TFT element 22 is covered with an insulating film 25. A first partition layer 26 made of an inorganic insulating film and a second partition layer 27 made of an organic insulating film are stacked between the dots on the insulating film 25, and these first and second partition walls are formed on the glass substrate 21. A plurality of dots constituting color pixels are partitioned in a matrix by the layers 26 and 27. These first and second partition layers 26 and 27 are suitable for forming an organic functional layer such as a hole injection / transport layer and a white light emitting layer, which will be described later, by a droplet discharge method such as an inkjet method.

  Within each dot, colored portions of different colors constituting the color filter are formed. In the present embodiment, the color filter 28 has four colored portions for each dot, a red colored portion 28R, a green colored portion 28G, a blue colored portion 28B, and a cyan colored portion 28C. , B, and C constitute one pixel. That is, color reproduction of color display is performed by additive color mixing of four primary color lights including red (R), green (G), blue (B), and cyan (C). Therefore, the organic EL device 20 according to the present embodiment has a wider color reproduction range than a device that performs color display with three colors of R, G, and B. A pixel electrode 29 (anode) electrically connected to the TFT element 22 by a contact hole that penetrates the insulating film 25 and the color filter 28 is formed.

  On each pixel electrode 29, a hole injection / transport layer 30 made of an organic material and a white light emitting layer 31 are sequentially laminated, and a common electrode 32 made of a metal film such as aluminum is formed on the white light emitting layer 31. Cathode) is formed. In the case of this embodiment, the white light emitting layer 31 of all dots is formed of the same organic material that can emit white light. As a material for forming the hole injection / transport layer 30, polymer materials such as polythiophene, polystyrene sulfonic acid, polypyrrole, polyaniline, and derivatives thereof can be suitably used. As a forming material (light emitting material) of the white light emitting layer 31, a polymer light emitting material or a low molecular weight organic light emitting dye, that is, a light emitting material such as various fluorescent materials or phosphorescent materials can be used. Among the conjugated polymers that serve as a light-emitting substance, those containing an arylene vinylene or polyfluorene structure are particularly preferable. When the white light emitting layer 31 is formed by an ink jet method (droplet discharge method), it is desirable to use a polymer material as the light emitting material. For example, polydioctylfluorene (PFO) and MEH-PPV are mixed at a ratio of 9: 1. What was done can be used suitably. In the present embodiment, the light emitting section 23 has the two-layer structure, but an electron transport layer, an electron injection layer, or the like may be provided on the light emitting layer as necessary.

  The surface of the glass substrate 21 configured as described above is covered with the sealing layer 33 and further sealed with the sealing substrate 24. A material having a gas barrier property is preferable as the material of the sealing layer 33. For example, silicon oxide, silicon nitride, or silicon oxynitride can be suitably used. Glass or the like can be used for the sealing substrate 24.

  Of course, it is possible to form separate organic materials for the white light emitting layer 31 in the present embodiment. Further, the thickness of the light emitting layer is changed for each dot and the pixel electrode 29 (anode) has a semi-transmissive structure. Alternatively, a configuration may be adopted in which light emission characteristics are controlled by an optical path length difference using an optical resonator structure between the pixel electrode 29 (anode) and the common electrode 32 (cathode). Although not shown in the present embodiment, it is of course possible to realize a similar configuration using a color filter and a light emitting layer in an active matrix top emission type organic EL device.

[Example 7]
The color filter of Example 7, the spectral characteristics of the organic EL device, and the xy chromaticity and u'v 'chromaticity of each primary color of R, G, B, and C when these are used are shown in FIGS. . 31 shows the spectral characteristics of the color filter, FIG. 32 shows the spectral characteristics of the organic EL device (white light emitting layer), FIG. 33 shows the xy chromaticity diagram, and FIG. 34 shows the u′v ′ chromaticity diagram. 33 and 34 also show the sRGB color reproduction range for comparison. Further, in order to confirm the color inclusion relationship, FIG. 34 also shows PointerGamut.

  As a result of the simulation with the setting using the color filter and the white light emitting layer, as shown in FIGS. 33 and 34, the xy chromaticity and u′v ′ chromaticity of each primary color are obtained (specific coordinates). (Refer to [Table 15] and [Table 16] for the values), and a color gamut indicated by a quadrilateral connecting the primary colors was obtained. In particular, as shown in FIG. 34, the color gamut of the seventh embodiment is sufficiently wider than those of the first to sixth embodiments using liquid crystal, including sRGB and further including PointerGamut. For these reasons, even when an organic EL device is used, colors defined in PointerGamut can be reproduced more faithfully than sRGB or the video display device disclosed in Patent Document 1.

[Third Embodiment]
Hereinafter, a third embodiment of the present invention will be described with reference to FIG.
This embodiment is an application example of the present invention to an active matrix bottom emission type organic EL device using a TFT element as a switching element, as in the second embodiment.
FIG. 35 is a cross-sectional view showing the overall configuration of the organic EL device of this embodiment. The basic configuration of the organic EL device of this embodiment is the same as that of the second embodiment, but instead of the configuration in which a white light emitting layer is provided for all dots, a light emitting layer that emits light of a different color for each dot is provided. Only the provided points differ from the second embodiment. Therefore, in FIG. 35, the same code | symbol is attached | subjected to the same component as FIG. 30, and detailed description is abbreviate | omitted.

  In the case of the organic EL device 40 of this embodiment, as shown in FIG. 35, a light emitting layer that emits light of a different color for each dot is formed. For example, four colored portions of a red light emitting layer 31R, a green light emitting layer 31G, a blue light emitting layer 31B, and a green light emitting layer 31G are formed from the left dot to the right dot in FIG. The second and fourth green light emitting layers 31G may be the same or different in material and film thickness. For example, as the material of each light emitting layer, cyanopyriphenylene vinylene can be used for the red light emitting layer 31R, polyphenylene vinylene or the like can be used for the green light emitting layer 31G and the blue light emitting layer 31B. And in each dot, the colored part of a different color which comprises a color filter is formed. The color filter side is the same as in the second embodiment. That is, from the left dot to the right dot in FIG. 35, each dot has four colored portions, a red colored portion 28R, a green colored portion 28G, a blue colored portion 28B, and a cyan colored portion 28C. The four dots R, G, B, and C constitute one pixel.

  That is, from the left side of FIG. 35, the red colored portion 28R of the color filter 28 is formed on the red light emitting layer 31R of the light emitting portion 23, the green colored portion 28G is formed on the green light emitting layer 31G, and the blue colored portion 28B is formed on the blue light emitting layer 31B. Each of the cyan colored portions 28C corresponds to the light emitting layer 31G. As a result, the color is obtained by additive color mixing of four primary colors including red (R), green (G), blue (B), and cyan (C). The display color is reproduced. Therefore, the organic EL device 40 of the present embodiment has a wider color reproduction range than that for performing color display with three colors of R, G, and B.

[Example 8]
36 to 39 show the color filter of Example 8, the spectral characteristics of the organic EL device, and the xy chromaticity and u'v 'chromaticity of each of the primary colors of R, G, B, and C when these are used. . 36 shows a spectral characteristic of the color filter, FIG. 37 shows a spectral characteristic of the organic EL device (each color light emitting layer), FIG. 38 shows an xy chromaticity diagram, and FIG. 39 shows a u′v ′ chromaticity diagram. 38 and 39 also show the sRGB color reproduction range for comparison. Furthermore, PointerGamut is also shown in FIG. 39 in order to confirm the color inclusion relationship.

  In Example 8, as shown in FIG. 37, the peak wavelength of light emitted from the blue light emitting layer is 455 nm, the peak wavelength of light emitted from the green light emitting layer is 530 nm, and the peak of light emitted from the red light emitting layer. The one having a wavelength of 650 nm was used. When viewed as a whole unit pixel composed of four dots, a luminance distribution as shown by a broken line is shown. Regarding the entire luminance distribution, the peak luminance of the green light is larger than that of the other colors because, as described in the above embodiment, one unit pixel has two green light emitting layers. Because. On the other hand, the same color filter as in Example 7 was used.

  As a result of the simulation with the setting using the above color filter and each color light emitting layer, as shown in FIGS. 38 and 39, the xy chromaticity and u′v ′ chromaticity of each primary color are obtained (specific coordinates). (Refer to [Table 17] and [Table 18] for the values), and a color gamut indicated by a square connecting the primary colors was obtained. In particular, as shown in FIG. 39, the color gamut of the eighth embodiment is sufficiently wider than those of the first to sixth embodiments using the liquid crystal and includes sRGB and also includes PointerGamut. For these reasons, even when an organic EL device is used, colors defined in PointerGamut can be reproduced more faithfully than sRGB or the video display device disclosed in Patent Document 1.

[Electronics]
An example of an electronic apparatus including the liquid crystal display device of the above embodiment will be described.
FIG. 25 is a perspective view showing an example of a mobile phone. In FIG. 25, reference numeral 1000 denotes a mobile phone body, and reference numeral 1001 denotes a display unit using the liquid crystal display device.
Since the electronic device shown in FIG. 25 includes the liquid crystal display device of the above-described embodiment, a portable electronic device including a liquid crystal display unit with excellent color reproducibility can be realized.

  The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in the above embodiment, an example in which the present invention is applied to an active matrix type transflective liquid crystal display device or an organic EL device using a TFT element has been shown. However, the present invention is not limited to this, and a TFD element is used. The present invention can also be applied to liquid crystal display devices such as active matrix type, passive matrix type, transmissive type, and reflective type. Alternatively, the present invention can be applied not only to a liquid crystal display device and an organic electroluminescence device but also to various display devices such as a plasma display. Furthermore, examples of the electronic device of the present invention include a portable information terminal (PDA), a photo viewer, and the like in addition to a mobile phone.

1 is a perspective view illustrating a schematic configuration of a liquid crystal display device according to a first embodiment of the present invention. 4 is an xy chromaticity diagram showing a color reproduction range of the liquid crystal display device. FIG. FIG. 6 is a u′v ′ chromaticity diagram showing a color reproduction range of the liquid crystal display device. FIG. 3 is a diagram illustrating spectral characteristics of a color filter of Example 1. FIG. 3 is a diagram showing spectral characteristics of the backlight of Example 1. 2 is an xy chromaticity diagram of Example 1. FIG. FIG. 4 is a u′v ′ chromaticity diagram of Example 1. 6 is a diagram illustrating spectral characteristics of a color filter of Example 2. FIG. FIG. 6 is a diagram showing the spectral characteristics of the backlight of Example 2. 6 is an xy chromaticity diagram of Example 2. FIG. FIG. 6 is a u′v ′ chromaticity diagram of Example 2. 6 is a diagram illustrating spectral characteristics of a color filter according to Example 3. FIG. FIG. 6 is a diagram showing the spectral characteristics of the backlight of Example 3. 6 is an xy chromaticity diagram of Example 3. FIG. 14 is a u′v ′ chromaticity diagram of Example 3. FIG. 6 is a diagram illustrating spectral characteristics of a color filter according to Example 4. FIG. FIG. 6 is a diagram showing the spectral characteristics of the backlight of Example 4. FIG. 10 is an xy chromaticity diagram of Example 4. FIG. 10 is a u′v ′ chromaticity diagram of Example 4. FIG. 10 is a diagram illustrating spectral characteristics of a color filter of Example 5. FIG. 10 is a diagram showing the spectral characteristics of the backlight of Example 5. FIG. 10 is an xy chromaticity diagram of Example 5. FIG. 10 is a u′v ′ chromaticity diagram of Example 5. FIG. 10 is a u′v ′ chromaticity diagram showing a color reproduction range of the video display device of Patent Document 1. It is a perspective view which shows an example of the electronic device of this invention. 10 is a diagram illustrating spectral characteristics of a color filter according to Example 6. FIG. It is a figure which shows the spectral characteristics of the backlight of Example 6. FIG. FIG. 10 is an xy chromaticity diagram of Example 6. FIG. 10 is a u′v ′ chromaticity diagram of Example 6. It is sectional drawing which shows schematic structure of the organic EL apparatus which is 2nd Embodiment of this invention. FIG. 10 is a diagram illustrating spectral characteristics of a color filter of Example 7. It is a figure which shows the spectral characteristics of the backlight of Example 7. FIG. FIG. 10 is an xy chromaticity diagram of Example 7. FIG. 10 is a u′v ′ chromaticity diagram of Example 7. It is sectional drawing which shows schematic structure of the organic EL apparatus which is 3rd Embodiment of this invention. FIG. 10 is a diagram illustrating spectral characteristics of a color filter of Example 8. It is a figure which shows the spectral characteristics of the backlight of Example 8. FIG. FIG. 10 is an xy chromaticity diagram of Example 8. FIG. 10 is a u′v ′ chromaticity diagram of Example 8.

Explanation of symbols

3 ... Liquid crystal display device 13, 28 ... Color filter, 13R, 28R ... Red colored part, 13G, 28G ... Green colored part, 13B, 28B ... Blue colored part, 13C, 28C ... Cyan colored part, 20, 40 ... Organic EL device.

Claims (8)

A display device that performs color display by emitting red, blue, first and second color lights,
In the xy chromaticity diagram, the coordinates of the first color are in the range of 0.257 ≦ x ≦ 0.357 and 0.606 ≦ y ≦ 0.653, and the coordinates of the second color are 0.098 ≦ A display device having a range of x ≦ 0.164 and 0.453 ≦ y ≦ 0.494.   In the xy chromaticity diagram, the red coordinates are in a range of x ≧ 0.643 (y is arbitrary), and the blue coordinates are in a range of y ≦ 0.056 (x is arbitrary). The display device described. A display device that performs color display by emitting red, blue, first and second color lights,
In the u′v ′ chromaticity diagram, the coordinates of the first color are 0.100 ≦ u ′ ≦ 0.150, 0.569 ≦ v ′ ≦ 0.574, and the coordinates of the second color are 0.046. ≦ u ′ ≦ 0.076, 0.499 ≦ v ′ ≦ 0.517 In the range of the display device,   In the u′v ′ chromaticity diagram, the red coordinates are in the range of u ′ ≧ 0.450 (v ′ is arbitrary) and the blue coordinates are in the range of v ′ ≦ 0.149 (u ′ is arbitrary). The display device according to claim 3, wherein   5. The display device according to claim 1, further comprising: a color filter having a color material layer having different wavelength selection characteristics; and an organic electroluminescence device that emits light having a plurality of peak wavelengths.   The light emitting portion of the organic electroluminescence device has a white light emitting layer that emits white light, and corresponds to the colored portion corresponding to the red, the colored portion corresponding to the blue, and the first color of the color filter. The display device according to claim 5, wherein the colored light is obtained by a combination of a colored portion, a colored portion corresponding to the second color, and the white light emitting layer.   The light emitting unit of the organic electroluminescence device includes a red light emitting layer that emits red light, a green light emitting layer that emits green light, and a blue light emitting layer that emits blue light, and the red light emitting layer of the color filter. A combination of a colored portion corresponding to the red light emitting layer of the light emitting portion, a combination of a colored portion corresponding to the blue color of the color filter and a blue light emitting layer of the light emitting portion, and the first color of the color filter. The color light is obtained by a combination of a corresponding colored portion and a green light emitting layer of the light emitting portion, and a combination of a colored portion corresponding to the second color of the color filter and the green light emitting layer of the light emitting portion. The display device according to claim 5. An electronic apparatus comprising the display device according to claim 1.

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