JP3897810B2 - Color liquid crystal display - Google Patents

Description

  The present invention relates to a color liquid crystal display device. In particular, the present invention relates to a transflective color liquid crystal display device that performs reflective display using external light incident from the outside when the ambient environment is bright and performs transmissive display using backlight when the ambient environment is dark.

  2. Description of the Related Art Conventionally, transflective color liquid crystal display devices that perform reflective display when the surrounding environment is bright and perform transmissive display illuminated by a backlight when the ambient environment is dark have been adopted in portable devices such as mobile phones. The present applicant has already filed an application (Japanese Patent Application No. 2001-0662925) for a transflective color liquid crystal display device having the following configuration. In this transflective color liquid crystal display device, a liquid crystal is sandwiched between a pair of substrates, and a color filter film, a reflective region portion that reflects light, and a transmissive region portion that transmits light are provided in a pixel region that is a unit of display. The color filter formed on the reflection region portion has an opening. According to this transflective color liquid crystal display device, it is possible to improve the display color saturation during transmissive display while maintaining the contrast of the brightness during reflective display.

  However, when the layer present on the viewer side of the reflective film, for example, the substrate, the overcoat film, the liquid crystal layer, the alignment film has a specific color, the transflective color liquid crystal display device, The present inventor has the problem that not only in reflective display but also in transmissive display, the color display image has a specific color tint as a whole, and there is a problem that the color reproducibility is not noticeable in monochrome display. Et al.

  Recently, there is an increasing need for a thin and light-weight transflective color liquid crystal display device, and it is eager to consider commercialization using a plastic substrate instead of a conventional glass substrate. .

  However, when a transflective color liquid crystal display device is manufactured using a plastic substrate instead of a conventional glass substrate, heating in forming a color filter film, forming a transparent electrode film, or forming an alignment film, etc. A colorless and transparent plastic substrate may be yellowish by a manufacturing process such as the above. In this case, the color display image is yellowish as a whole not only during reflection display but also during transmissive display, which may cause a problem of deterioration in color reproducibility.

  In view of the above problems, an object of the present invention is to provide a color liquid crystal display device excellent in color reproducibility, particularly a transflective color liquid crystal display device.

  A color liquid crystal display device according to a first aspect of the present invention includes a pair of substrates and a liquid crystal layer provided between the pair of substrates, and a color liquid crystal display device including a plurality of pixels composed of pixels of a plurality of colors. A reflective film having an opening in each pixel region between the pair of substrates and in which the pixels of the plurality of colors exist, and an opening provided on the viewer side of the reflective film. The color filter layer in the pixel area of one or more colors among the pixel areas of the plurality of colors, and the color filter in the other pixel area of one or more colors of the pixel areas of the plurality of colors. A color liquid crystal display device in which the opening is smaller than the layer.

  According to the color liquid crystal display device according to the first aspect of the present invention, the color of the reflected light is a specific color due to a layer, such as a substrate, an overcoat film, a liquid crystal layer, an alignment film, etc. present on the viewer side of the reflective film. , The area ratio of the color filter layer having a hue close to that of the specific color can be increased relative to the color filter layers of other hues. Therefore, it is possible to perform reflective color display with excellent color reproducibility during reflective display.

  In the color liquid crystal display device according to the first aspect of the present invention, the substrate is a plastic substrate, the pixels of the plurality of colors are three-color pixels of red, green, and blue, and the blue color is the pixel region of the plurality of colors. The color filter layer in the pixel region may have a smaller opening than the color filter layer in the red and green pixel regions of the plurality of color pixel regions.

  According to this color liquid crystal display device, the area ratio of the blue color filter layer close to the complementary color of yellow is obtained when a transparent plastic substrate having a yellowish tint is present on the viewer side from the reflective film. It can be increased relative to the other red and green color filter layers. Therefore, during the reflective display, the reflected light can be close to white light during the white display, and a reflective color display with excellent color reproducibility can be performed.

  A color liquid crystal display device according to a second aspect of the present invention has a pair of substrates and a liquid crystal layer provided between the pair of substrates, and has a plurality of picture elements composed of pixels of a plurality of colors. A reflective film having an opening in each pixel region between the pair of substrates and in which the pixels of the plurality of colors exist, and an opening provided on the viewer side of the reflective film. And the reflective film in the pixel region of one or more colors among the pixel regions of the plurality of colors is more than the reflective film in another pixel region of one or more colors of the pixel regions of the plurality of colors. Is a color liquid crystal display device having a large opening.

  According to the color liquid crystal display device according to the second aspect of the present invention, a light source itself such as a backlight or a layer existing in a path through which light from the light source passes, such as a light guide plate, two substrates, a liquid crystal layer, etc. When the transmitted light is tinged with a specific color, the area ratio of the color filter layer close to the complementary color of the specific color can be relatively increased as compared with the color filter layers of other hues. Therefore, at the time of transmissive display, transmissive color display with excellent color reproducibility can be performed.

  In the color liquid crystal display device according to the second aspect of the present invention, the substrate is a plastic substrate, the pixels of the plurality of colors are pixels of three colors of red, green, and blue, and the blue of the pixel regions of the plurality of colors is blue. The reflective film in the pixel area may have a larger opening than the reflective film in the red and green pixel areas of the plurality of color pixel areas.

  According to this color liquid crystal display device, when two transparent plastic substrates that are yellowish through a manufacturing process exist in a path through which light from a light source such as a backlight passes, a blue color close to a complementary color of yellow The area ratio of the color filter layer can be increased relative to the other red and green color filter layers. Therefore, during transmissive display, transmitted light can be close to white light during white display, and transmissive color display with excellent color reproducibility can be performed.

  A color liquid crystal display device according to a third aspect of the present invention includes a pair of substrates and a liquid crystal layer provided between the pair of substrates, and a color liquid crystal display device including a plurality of picture elements composed of pixels of a plurality of colors. A reflective film having an opening in each pixel region between the pair of substrates and in which the pixels of the plurality of colors exist, and an opening provided on the viewer side of the reflective film. The color filter layer in the pixel area of one or more colors among the pixel areas of the plurality of colors, and the color filter in the other pixel area of one or more colors of the pixel areas of the plurality of colors. The opening is smaller than the layer, and the reflection film in the pixel area of one or more colors among the pixel areas of the plurality of colors is more than the reflection film in another pixel area of one or more colors of the pixel areas of the plurality of colors. Before Opening is large, a color liquid crystal display device.

  According to the color liquid crystal display device according to the third aspect of the present invention, a layer that is closer to the viewer than the reflective film, a light source such as a backlight itself, or a layer that is present in a path through which light from the light source passes is used. When the reflected light or transmitted light has a specific color, the area ratio of the color filter layer having a hue close to the complementary color of the specific color can be relatively increased as compared with the color filter layers having other hues. Therefore, it is possible to perform reflective color display with excellent color reproducibility during reflective display and transmissive display.

  In a color liquid crystal display device according to a third aspect of the present invention, the substrate is a plastic substrate, the pixels of the plurality of colors are three-color pixels of red, green, and blue, and the blue color is the pixel region of the plurality of colors. The color filter layer in the pixel area is smaller in the opening than the color filter layer in the red and green pixel areas of the plurality of color pixel areas, and in the blue pixel area of the plurality of color pixel areas. The reflective film may have a larger opening than the reflective film in the red and green pixel regions of the plurality of color pixel regions.

  According to this color liquid crystal display device, when there is a transparent plastic substrate having a yellowish color through a manufacturing process on the viewer side of the reflective film or in a path through which light from a light source such as a backlight passes. The area ratio of the blue color filter layer close to the yellow complementary color can be relatively increased as compared with the other red and green color filter layers. Therefore, during the reflective display and the transmissive display, the reflected light and the transmitted light can be close to white light during the white display, and a transmissive color display with excellent color reproducibility can be performed.

  According to the color liquid crystal display device of the present invention, transmissive and / or reflective color display with excellent color reproducibility can be performed.

  Embodiments according to the present invention will be described below with reference to the drawings. In the following embodiments, a case where a plastic substrate such as polyethersulfone, polycarbonate, epoxy resin, polyethylene terephthalate, or the like is used as the substrate will be described. In addition, a simple matrix drive type STN liquid crystal display device is taken as an example of the liquid crystal display device, but the color liquid crystal display device of the present invention is a switching device such as a TFT (Thin Film Trasistor) or MIM (Metal-Insulator-Metal). The present invention can be applied to an active matrix driving type color liquid crystal display device using elements.

(Embodiment 1)
An embodiment of a color liquid crystal display device according to a third aspect of the present invention will be described. FIG. 1 is a cross-sectional view schematically showing a transflective color liquid crystal display device of this embodiment. The liquid crystal display device includes an upper polarizing plate 1, a first retardation plate 2, a second retardation plate 3, an upper plastic substrate 4, a transparent display electrode 5, and an alignment film from the observer side (upper side in FIG. 1). 7, STN liquid crystal layer 8, alignment film 7, transparent display electrode 5, overcoat film 9, color filter layer 10, reflective film 11, lower plastic substrate 12, third retardation film 13, lower polarizing plate 14, The light guide plate 15 and the backlight 16 are arranged in this order. The upper plastic substrate 4 and the lower plastic substrate 12 are bonded to each other with a seal resin 6 to seal the STN liquid crystal layer 8.

  In this specification, the minimum unit of display is referred to as “picture element”, and “pixels” of a plurality of colors, for example, “pixels” of three colors of red (R), green (G), and blue (B) are used as one “pixel”. A “picture element” is configured. A region (pixel region) of the liquid crystal display device corresponding to “pixel” is defined by display electrodes sandwiching the liquid crystal layer. For example, in a simple matrix liquid crystal display device, each region where a column electrode provided in a stripe shape and a row electrode provided so as to be orthogonal to the column electrode intersect each other defines a pixel region. In an active matrix liquid crystal display device, a pixel region is defined by a pixel electrode and a counter electrode facing the pixel electrode. In the configuration in which the black matrix is provided, strictly speaking, among the regions to which a voltage is applied according to the state to be displayed, the region corresponding to the opening of the black matrix corresponds to the pixel region.

  FIG. 2 is a plan view schematically showing one picture element in the liquid crystal display device of Embodiment 1, and FIG. 3 is a sectional view taken along line x-x ′. In the present embodiment, one picture element is formed from pixels of R, G, and B hues. Each of the R, G, and B color filter layers 10R, 10G, and 10B has an opening 20R, 20G, and 20B in each pixel region. In the present embodiment, each color filter layer 10R, 10G, 10B has two rectangular openings 20R, 20G, 20B.

  In the present embodiment, the color filter layer 10B in the blue pixel region has a smaller opening size (area) than the color filter layers 10R and 10G in the other pixel regions of red and green. Therefore, among the R, G, and B color filter layers 10R, 10G, and 10B, the blue color filter layer 10B has the largest area of the color filter layer that colors the reflected light reflected by the reflective film 11.

  Further, in the present embodiment, the reflective film 11 in each of the R, G, and B pixel regions has openings 21R, 21G, and 21B for transmitting light from the backlight 16 in the transmissive region 101, respectively. Yes. The positions of the openings 21R, 21G, and 21B in each pixel region are designed so as not to overlap the openings 20R, 20G, and 20B of the color filter layers 10R, 10G, and 10B. In other words, the openings 20R, 20G, and 20B of the color filter layers 10R, 10G, and 10B are provided in the reflective region 102 of the reflective film 11. A part or all of the openings 20R, 20G, and 20B of the color filter layers 10R, 10G, and 10B may be provided in the transmission region 101 of the reflective film 11. However, when the transmission region 101 is included in the regions of the openings 20R, 20G, and 20B of the color filter layers 10R, 10G, and 10B, the transmitted light is not colored by the color filter layers 10R, 10G, and 10B and is transmitted. A problem arises in the color reproducibility of color display during display.

  The total area of the openings 21R, 21G, and 21B per pixel is preferably 25% to 80% of the area of the pixel region, and is set to 30%, for example. If it is less than 25%, the use of transmitted light is small and the screen during transmissive display becomes dark. If it exceeds 80%, the transmissive display is sufficient, but the screen for reflective display becomes dark, causing a problem in visibility.

  In the present embodiment, the reflective film 11 in the blue pixel region has a larger opening size (area) than the reflective film 11 in the other pixel regions of red and green. Therefore, among the R, G, and B color filter layers 10R, 10G, and 10B, the blue color filter layer 10B has the largest area of the color filter layer that colors the transmitted light from the backlight 16.

  According to the color liquid crystal display device of this embodiment, the spectral characteristics obtained by combining the reflected light of each pixel with picture elements are good, and the reflected light can be changed to desired white light. Further, the transmitted light of each pixel from the backlight 16 has a good spectral characteristic by combining the picture elements, and the transmitted light can be changed to desired white light.

  The sizes of the openings 20 of the color filter layer 10 and the openings 21 of the reflective film 11 are determined so that the color reproducibility of color display during reflection display and transmission display is optimized. For example, if the opening 21B of the reflective film 11 in the blue pixel region is too large, the reflected light reflected by the reflective film 11 is blue even if the opening 20B of the color filter layer 10B in the blue pixel region is reduced. The area of the color filter layer 10B to be colored is smaller than the areas of the other two color filter layers 10R and 10G that color the reflected light in the respective hues, and there is a possibility that the color balance shift at the time of reflective display cannot be corrected. is there. Therefore, in the present embodiment, the opening 21B of the reflective film 11 in the blue pixel region is larger than the openings 21R and 21G of the reflective film 11 in the other pixel regions of red and green, and the reflected light is blue. Each of the openings 20R, 20G, and 10G of the color filter layer 10 so that the area of the color filter layer 10B to be colored is larger than the areas of the other two color filter layers 10R and 10G that color the reflected light in the respective hues. The size (area) of 20B is determined.

  A method for manufacturing the color liquid crystal display device of this embodiment will be described. First, the reflective film 11 is formed by depositing aluminum on the lower plastic substrate 12 to a thickness of 100 nm. As the reflective film, a highly reflective film such as an Al film, an Ag film, or an Ag alloy film (eg, Ag—Pd) can be used. Aluminum is patterned using a photolithography method to form through holes (openings) 21R, 21G, and 21B for light transmission. When patterning aluminum, the area of the opening 21B of the reflective film 11 corresponding to the blue pixel area is larger than the areas of the openings 21R and 21G of the reflective film 11 corresponding to the red and green pixel areas. To pattern.

  Next, in order to form the color filter layer 10 by electrodeposition, an electrodeposition ITO film (electrode) 17 is formed on the entire surface of the lower plastic substrate 12. In order to form the openings 20R, 20G, and 20B in the R, G, and B color filter layers 10R, 10G, and 10B, the electrodeposition ITO film (electrode) in the region where the openings 20R, 20G, and 20B are formed 17 is removed by patterning. When patterning the electrodeposition ITO film (electrode) 17, the area of the opening 20B of the blue color filter layer 10B is larger than the areas of the openings 20R and 20G of the red and green color filter layers 10R and 10G. Pattern so as to be smaller. The color filter layer 10 may be formed by a known method such as a printing method or a pigment dispersion method.

  Further, an acrylic resin-based overcoat film (planarization film) 9 is formed on the lower plastic substrate 12. The formation of the overcoat film (planarizing film) 9 can be omitted.

  By depositing and etching ITO (indium tin oxide) on the upper plastic substrate 4 and on the overcoat film (flattening film) 9 of the lower plastic substrate 12, respectively, a matrix-like transparent display electrode 5 is formed. Note that a black matrix may be formed around each pixel region with a light-absorbing substance. This improves the black shielding power, which can contribute to higher contrast. On the transparent display electrode 5, polyimide is applied by printing and baked to form the alignment film 7. Thereafter, a rubbing process is performed so that the twist angle of the liquid crystal molecules is 240 ° twist.

  After the upper and lower substrates 4 and 13 are bonded to each other with the sealing resin 6, the STN liquid crystal layer 8 is formed by injecting a liquid crystal material with adjusted birefringence Δn and pitch, thereby forming an STN liquid crystal cell. A laminated polycarbonate-stretched phase difference plate 2, 3 having a desired dΔn, a third phase difference plate 13, and a neutral gray upper polarizing plate 1 and a lower polarizing plate 14 are predetermined with respect to the liquid crystal cell. Paste to become the axis. D is the thickness of the retardation plate. Further, a light guide plate 15 and a backlight 16 are provided on the opposite side to the observer side so that the backlight light is incident on the liquid crystal cell.

  In the color liquid crystal display device of the present invention, the area ratio (opening area / reflective area) of the opening of the reflective region corresponding to each pixel of red, green, and blue is the light source (including natural light) in the reflective state. ) And color filters, or the reflection characteristics of the plastic substrate. In addition, the area ratio of the openings of the transmissive regions corresponding to the respective pixels of red, green, and blue (the area of the openings / the area of the transmissive regions) is set to the spectral characteristics such as a backlight and a color filter in the transmissive state, or a plastic substrate. Can be selected according to the transmission characteristics.

(Comparative example)
A comparative example for comparison with the color liquid crystal display device of Embodiment 1 will be described with reference to FIG. In this comparative example, the sizes (areas) of the openings 20R, 20G, and 20B of the color filter layers 10R, 10G, and 10B in the R, G, and B pixel regions are equal for the R, G, and B pixels. It is set as follows. Further, the sizes (areas) of the openings 21R, 21G, and 21B of the reflective film 11 in the R, G, and B pixel regions are set to be equal for the R, G, and B pixels. Accordingly, the area of each color filter layer 10 through which light is transmitted during the reflective display and the transmissive display is equal in each of the R, G, and B pixel regions.

  In the color liquid crystal display device of this comparative example, when a colorless and transparent plastic substrate becomes yellowish by a manufacturing process such as heating in the formation of a color filter layer, the formation of a transparent electrode film or the formation of an alignment film, etc. The color display image is yellowish as a whole not only in reflective display but also in transmissive display, which may cause a problem of deterioration in color reproducibility.

(Embodiment 2)
An embodiment of a color liquid crystal display device according to the first aspect of the present invention will be described. FIG. 5 is a plan view schematically showing one picture element in the transflective color liquid crystal display device of the present embodiment. Reference numerals in FIG. 5 correspond to those of the first embodiment. In the color liquid crystal display device of the present embodiment, the sizes (areas) of the openings 21R, 21G, and 21B of the reflective film 11 in the R, G, and B pixel regions are the same for the R, G, and B pixels. Thus, it is different from the color liquid crystal display device of the first embodiment.

  In the color liquid crystal display device of the present embodiment, the size (area) of the opening 20B of the color filter layer 10B in the blue pixel region is the same as that of the color filter layers 10R and 10G in the other pixel regions of red and green. , Smaller than the size (area) of 20G. Therefore, among the R, G, and B color filter layers 10R, 10G, and 10B, the blue color filter layer 10B has the largest area of the color filter layer that colors the reflected light reflected by the reflective film 11.

  According to the color liquid crystal display device of the present embodiment, the area ratio of the blue color filter layer 10B that is close to the complementary color of yellow (the area of the opening) when the upper plastic substrate 4 that is yellowish after the manufacturing process exists. / Area of the reflection region) can be increased relative to the other red and green color filter layers 10R and 10G. Therefore, during the reflective display, the reflected light can be close to white light during the white display, and a reflective color display with excellent color reproducibility can be performed.

(Embodiment 3)
An embodiment of a color liquid crystal display device according to the second aspect of the present invention will be described. FIG. 6 is a plan view schematically showing one picture element in the transflective color liquid crystal display device of the present embodiment. Reference numerals in FIG. 6 correspond to those of the first embodiment. In the color liquid crystal display device of the present embodiment, the sizes (areas) of the openings 20R, 20G, and 20B of the color filter layers 10R, 10G, and 10B in the R, G, and B pixel regions are R, G, and B, respectively. It differs from the color liquid crystal display device of Embodiment 1 in that each pixel is the same.

  In the color liquid crystal display device of the present embodiment, the size (area) of the opening 21B of the reflective film 11 in the blue pixel region is such that each of the openings 21R and 12G of the reflective film 11 in the other pixel regions of red and green. It is larger than the size (area). Accordingly, among the R, G, and B color filter layers 10R, 10G, and 10B, the blue color filter layer 10B has the largest area of the color filter layer that colors the transmitted light from the backlight.

  According to the color liquid crystal display device of the present embodiment, when there are two plastic substrates 4 and 12 that are yellowish through the manufacturing process, the area ratio of the blue color filter layer 10B close to the yellow complementary color ( The area of the opening / the area of the transmissive region) can be increased relative to the other red and green color filter layers 10R and 10G. Therefore, during transmissive display, transmitted light can be close to white light during white display, and transmissive color display with excellent color reproducibility can be performed.

(Other embodiments)
In the first to third embodiments, the case where the substrates 4 and 12 are plastic substrates has been described. However, glass substrates such as float glass and soda glass may be used. In the first to third embodiments, the reflective film 11 and the color filter layer 10 are laminated on the lower plastic substrate 12, but the reflective film 11 and the color filter layer 10 may be laminated on the upper plastic substrate 4. Further, the color filter layer 10 may be formed on the upper plastic substrate 4, and the reflective film 11 may be formed on the lower plastic substrate 12. In Embodiments 1 to 3, the liquid crystal display device having a polarizing plate has been described as an example. However, the present invention can also be applied to a guest-host liquid crystal display device that does not require a polarizing plate.

  In the first to third embodiments, the case where a full color image is displayed with three colors of red, green, and blue has been described. However, a full color image may be displayed with three colors of magenta, yellow, and cyan. In the color liquid crystal display device of the present invention, other pixel arrangements such as a delta arrangement, a mosaic arrangement, and a square arrangement can be adopted in addition to the stripe arrangement shown in the first to third embodiments. In the color liquid crystal display device of the present invention, the number of hues of pixels may be 4 or more.

  In the first to third embodiments, the size of the opening 20B of the color filter layer 10B in the blue pixel region and the size of the opening 21B of the reflective film 11 are the same as the openings of the color filter layers 10R and 10G in the red and green pixel regions. The case where the sizes of the openings 21R and 21G of the reflection film 11 are different from those of the openings 20R and 20G has been described. However, the opening in either the red or green pixel region may be different in size from the opening in the other two color pixel regions. In addition, the openings 20R, 20G, 20B and 21R, 21G, 21B in the pixel regions of each hue of red, green, and blue have an area ratio (opening area / reflection area or opening area / transmission area). May be different.

( Embodiment 4 )
In the color liquid crystal display device of the present invention, the color filter layer has an opening. However, as shown in FIG. 7, even when the color filter layers 10R, 10G, and 10B for each hue do not have openings, the reflective film 11 in each pixel region has openings 21R, 21G, and 21B. If the opening 21B in the pixel region of one or more colors (blue in FIG. 7) is larger than the openings 21R and 21G in other pixel regions of one or more colors (red and green in FIG. 7), The same effects as those of the third embodiment are obtained.

  Specifically, the size (area) of the opening 21B of the reflective film 11 in the blue pixel region is larger than the size (area) of the openings 21R and 12G of the reflective film 11 in the other red and green pixel regions. Since it is large, the blue color filter layer 10B among the R, G, and B color filter layers 10R, 10G, and 10B has the largest area of the color filter layer that colors the transmitted light from the backlight. Therefore, when two plastic substrates with a yellowish color are present after the manufacturing process, the area ratio of the blue color filter layer close to the complementary color of yellow is relative to that of the other red and green color filter layers. Therefore, in transmissive display, transmitted light can be close to white light during white display, and transmissive color display with excellent color reproducibility can be performed.

(Reference Example 1 )
The color liquid crystal display device of the present invention is a transflective color liquid crystal display device having a reflective film having an opening. However, as shown in FIG. 8, even in a total reflection type color liquid crystal display device in which the reflective film does not have an opening, the color filter layers 10R, 10G, and 10B of each hue have openings 20R, 20G, and 20B. And the openings 20B in the pixel region of one or more colors (blue in FIG. 8) have openings 20R and 20G in the other pixel regions of one or more colors (red and green in FIG. 8). If it is smaller than that, the same effect as in the second embodiment is obtained.

  Specifically, the size (area) of the opening 20B of the color filter layer 10B in the blue pixel region is the size of the openings 20R and 20G of the color filter layers 10R and 10G in the other pixel regions of red and green ( Area), the blue color filter layer 10B among the R, G, B color filter layers 10R, 10G, 10B has the largest area of the color filter layer that colors the reflected light reflected by the reflective film. growing. Therefore, when the upper plastic substrate having a yellowish color is present after the manufacturing process, the area ratio of the blue color filter layer 10B close to the yellow complementary color is set to be larger than that of the other red and green color filter layers 10R and 10G. Since it can be relatively increased, in the reflective display, the reflected light can be close to white light in the white display, and a reflective color display with excellent color reproducibility can be performed.

(Reference Example 2 )
Be transmissive color liquid crystal display device having no reflecting film, in the same manner as in Reference Example 1, the color filter layer 10R of each color, 10G, 10B is has openings 20R, 20G, and 20B, 1 If the opening 20B in the pixel region of one or more colors (for example, one color of blue) is smaller than the openings 20R and 20G in the other pixel regions of one or more colors (for example, two colors of red and green), the same as in the third embodiment (See FIG. 8).

  Specifically, the size (area) of the opening 20B of the color filter layer 10B in the blue pixel region is the size of the openings 20R and 20G of the color filter layers 10R and 10G in the other pixel regions of red and green ( Area), the blue color filter layer 10B of the R, G, B color filter layers 10R, 10G, 10B has the largest area of the color filter layer that colors the transmitted light from the backlight. . Therefore, when two plastic substrates with a yellowish color are present after the manufacturing process, the area ratio of the blue color filter layer close to the complementary color of yellow is relative to that of the other red and green color filter layers. Therefore, in transmissive display, transmitted light can be close to white light during white display, and transmissive color display with excellent color reproducibility can be performed.

  The present invention relates to a color liquid crystal display device, in particular, a transflective color liquid crystal that performs reflective display using external light incident from the outside when the ambient environment is bright, and performs transmissive display using backlight when the ambient environment is dark. Useful for display devices.

1 is a cross-sectional view schematically showing a transflective color liquid crystal display device of Embodiment 1. FIG. 4 is a plan view schematically showing one picture element in the liquid crystal display device of Embodiment 1. FIG. FIG. 3 is a sectional view taken along line x-x ′ of FIG. 2. 6 is a plan view schematically showing one picture element in the liquid crystal display device of Comparative Example 1. FIG. 6 is a plan view schematically showing one picture element in the transflective color liquid crystal display device of Embodiment 2. FIG. FIG. 10 is a plan view schematically showing one picture element in the transflective color liquid crystal display device of Embodiment 3. 6 is a plan view schematically showing one picture element in the liquid crystal display device of Embodiment 4. FIG. 6 is a plan view schematically showing one picture element in the liquid crystal display device of Reference Example 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper polarizing plate 2 1st phase difference plate 3 2nd phase difference plate 4 Upper plastic substrate 5 Transparent display electrode 6 Seal resin 7 Orientation film 8 STN liquid crystal layer 9 Overcoat film (flattening film)
DESCRIPTION OF SYMBOLS 10 Color filter layer 11 Reflective film 12 Lower plastic substrate 13 Third phase difference plate 14 Lower polarizing plate 15 Light guide plate 16 Backlight 17 Electrodeposition ITO film (electrode)
20 Opening of color filter layer 21 Opening of reflective film R Red pixel area G Green pixel area B Blue pixel area

Claims (2)

A color liquid crystal display device having a pair of substrates and a liquid crystal layer provided between the pair of substrates and having a plurality of picture elements composed of pixels of a plurality of colors,
Each pixel area where the pixels of the plurality of colors exist is opposite to the observer side and a reflection area that emits reflected light that reflects light incident on the pair of substrates from the observer side to the observer side. A transmission region that transmits transmitted light that has passed through the light incident from the side to the viewer side, and a color filter layer is provided at a position through which the transmitted light from the transmission region and the reflected light from the reflection region pass. And
The area of the color filter layer in the transmission region of the pixel region of the predetermined color among the pixel regions of the plurality of colors is larger than the area of the color filter layer in the transmission region of the other pixel region of the pixel region of the plurality of colors,
A color liquid crystal display device, wherein the pixels of the plurality of colors are pixels composed of red, green, and blue.   The color liquid crystal display device according to claim 1, wherein the predetermined color is blue.

Images