JP2002341333A - Translucent liquid crystal display device and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a translucent liquid crystal display device by which suitable brightness and color tone can be realized both when transmission display is performed and when reflection display is performed. SOLUTION: A plurality of pixel areas 10a each having a reflection area 10b and a transmission area 10c are formed in a matrix shape in the liquid crystal display device. A recess 16a is formed at a resin layer 16 in the transmission area 10c. The film thickness of a color filter layer 13 in the transmission area 10c controlled by adjusting the depth of the recess 16a. Thereby the transmittance of the color filter layer 13 in the reflection area 10b and the transmittance of the color filter 13 in the transmission area 10c are specified to be 55-66% and 40-50%, respectively. The saturation values of the color filter layer 13 in both areas 10b and 10c are specified to be 20-40.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflection type and transmission type liquid crystal display device (hereinafter, referred to as a transflective type) and a method of manufacturing the same.

[0002]

2. Description of the Related Art A transflective color liquid crystal display device is widely used as a display of a portable device or the like because of its features of low power consumption, transmissive display using a backlight, and use in any environment. I am trying to do. The display modes of the transflective liquid crystal display device include a TN (twisted nematic) method requiring a polarizing plate, a STN (super twisted nematic) method, a guest-host method requiring no polarizing plate, and a polymer dispersion method.

In a transflective color liquid crystal display device, a color filter layer is provided closer to the viewer than the reflective layer, and
As the reflective layer, a semi-transmissive reflective layer having an opening for transmitting light in a transmission area is employed. In a display mode requiring a polarizing plate, a color filter layer having a high transmittance is employed in order to increase brightness at the time of reflection.

In a transflective liquid crystal display device, the number of times light passes through the color filter layer is twice in reflective display and once in transmissive display. If the optical density of the color filter layer is set in this way, color reproduction in the other area becomes worse. Japanese Patent Application Laid-Open No. 2000-298271 discloses that in order to provide a semi-transmissive liquid crystal display device capable of appropriate color reproduction, the optical density of a color filter layer in a reflection region is adjusted by controlling the optical density of the color filter layer in the transmission region of the same color as the color filter layer. It is disclosed that the optical density of the color filter layer is reduced to about half or less.

[0005]

However, in a liquid crystal display device in which reflective display is performed with a single polarizing plate, a color filter layer of a higher transmission type than a general color filter layer is employed. The present inventors have found that it is difficult to appropriately adjust the brightness and hue in both transmissive display and reflective display only by adjusting the optical density of the filter layer.

SUMMARY OF THE INVENTION An object of the present invention is to provide a transflective liquid crystal display device capable of realizing appropriate brightness and color in both transmissive display and reflective display.

[0007]

The present invention provides the following transflective liquid crystal display devices (1) to (5).

[0008] (1) The opposing substrate, comprising: a substrate on which a reflective layer for reflecting light is formed; an opposing substrate opposing the substrate; and a liquid crystal layer interposed between the substrate and the opposing substrate. A plurality of pixel regions each having a reflection region in which light incident from the side is reflected by the reflection layer and a transmission region in which light incident from the substrate side is transmitted to the counter substrate side are formed in a matrix, and a plurality of pixel regions are formed on the reflection layer. Alternatively, in a transflective liquid crystal display device in which a color filter layer is provided on the counter substrate, a transmittance of the color filter layer in the reflection region is 55% or more and 66% or less; The transmittance of the color filter layer is 40% or more 5
A transflective liquid crystal display device having 0% or less.

If the transmittance of the color filter layer in the reflection area is less than 55%, the display becomes dark and difficult to see during reflection display, and if the transmittance exceeds 66%, the display color in reflection display becomes light and difficult to see. Become. In the transmission area, the light is 1
Times, the transmittance of the color filter layer is 4
If it is less than 0%, it is difficult to see darkly in the transmissive display, and if the transmittance of the color filter layer exceeds 50%, the color in the reflective display is pale and hard to see. According to the present invention, by changing the setting of the transmittance between the reflective area and the transmissive area, it is possible to realize appropriate brightness and hue both at the time of transmissive display and at the time of reflective display, and achieve good display quality. Can be realized. In the present invention, the transmittance is R (red), G (green), B in the XYZ color system.
(Blue) It is represented by the average value of each Y value. That is, R
(Red), G (Green), and B (Blue) are each represented by a value obtained by dividing the sum of the Y values by 3.

(2) The transflective liquid crystal display device according to (1), wherein the saturation of the color filter layer in the reflection area and the transmission area is both 20 or more and 40 or less.

When the saturation of the color filter layer in both the reflection area and the transmission area is less than 20, the display becomes light and hard to see, and when the saturation exceeds 40, the transmittance of the color filter layer decreases. The display becomes dark.
It is preferable that the color filter layer in the reflection region and the color filter layer in the transmission region have the same saturation. In the present invention, the saturation is a value obtained by multiplying the area of a triangle obtained by connecting the chromaticity coordinates of each of R (red), G (green), and B (blue) by 1000 in the chromaticity coordinates xy in the XYZ color system. expressed.

(3) When the thickness of the color filter layer in the reflection area is d1 and the thickness of the color filter layer in the transmission area is d2, 1.3 ≦ d2 /
d1 ≦ 3.0, preferably 1.8 ≦ d2 / d1 ≦ 2.2
The transflective liquid crystal display device according to the above (1) or (2), having the following relationship.

According to the transflective liquid crystal display device of the above (3), the saturation can be increased while the transmittance of the color filter layer in the transmission region is reduced. For example, d2 / d1
When = 2, the saturation in the reflective display and the transmissive display can be made the same, and the display quality in both displays can be made equal.

(4) The resin layer and the color filter layer are sequentially formed on the substrate or the counter substrate, and the resin layer in the transmission region is provided with a concave portion on the color filter layer side. The transflective liquid crystal display device according to any one of (1) to (3), wherein the thickness of the color filter layer is different between the reflection region and the transmission region.

According to the transflective liquid crystal display device of the above (4), the depth of the concave portion provided in the resin layer becomes the difference in the thickness of the color filter layer between the reflection region and the transmission region. By controlling the depth of the concave portion of the layer, the thickness of the color filter layer can be easily controlled.

(5) The transmittance or saturation of the color filter layer in the reflection region and the transmission region is adjusted by adjusting the type or concentration of the colorant in the color filter layer in the reflection region and the transmission region. The transflective liquid crystal display device according to the above (1) or (2), wherein

According to the transflective liquid crystal display device of the above (5), while the color filter layers in the reflective region and the transmissive region have the same thickness, the transmittance and the chroma described in the above (1) or (2) are provided. Is formed.

According to a first aspect of the present invention, there is provided a method of manufacturing a transflective liquid crystal display device, comprising: a substrate on which a reflective layer for reflecting light is formed; a counter substrate facing the substrate; A reflective region having a liquid crystal layer interposed therebetween, and reflecting light incident from the counter substrate side by the reflective layer, and a transmission region transmitting light incident from the substrate side to the counter substrate side. A plurality of pixel regions having a matrix shape, and a color filter layer provided on the reflective layer or the counter substrate, the method for manufacturing a transflective liquid crystal display device, wherein the A step of forming the resin layer on a substrate, a step of forming a concave portion having a predetermined depth in the resin layer, filling the concave portion with a material for the color filter layer, and forming the color filter on the resin layer. layer Forming, so that the transmittance of the color filter layer in the reflection region is 55% or more and 66% or less, and the transmittance of the color filter layer in the transmission region is 40% or more and 50% or less. A method of manufacturing a transflective liquid crystal display device, wherein the thickness of the color filter layer in the reflection region and the transmission region is controlled.

According to the manufacturing method of the first aspect of the present invention, since the thickness of the color filter layer in the transmission region is determined by the depth of the concave portion formed in the resin layer, the depth of the concave portion is adjusted. By doing so, it is possible to easily control the thickness of the color filter layer in the transmission region.
The depth of the concave portion of the resin layer can be adjusted by, for example, the etching condition of the resin layer.

In the method for manufacturing a transflective liquid crystal display device according to the first aspect of the present invention, the color filter layer in the reflective region and the transmissive region has a saturation of 20 or more and 40 or less. It is preferable to control the thickness of the color filter layer in the reflection region and the transmission region.

In the method for manufacturing a transflective liquid crystal display device according to the first aspect of the present invention, the thickness of the color filter layer in the reflection area is d1, and the thickness of the color filter layer in the transmission area is d2. 1.3
The thickness of the color filter layer in the reflection region and the transmission region may be controlled so as to have a relationship of ≦ d2 / d1 ≦ 3.0. Preferably 1.8 ≦ d2 / d
The thickness of the color filter layer in the reflection region and the transmission region is controlled so as to have a relationship of 1 ≦ 2.2.

According to a second aspect of the present invention, there is provided a method of manufacturing a transflective liquid crystal display device, comprising: a substrate on which a reflective layer for reflecting light is formed; a counter substrate facing the substrate; A reflective region having a liquid crystal layer interposed therebetween, and reflecting light incident from the counter substrate side by the reflective layer, and a transmission region transmitting light incident from the substrate side to the counter substrate side. A plurality of pixel regions having a matrix shape, and a color filter layer provided on the reflective layer or the counter substrate, a method of manufacturing a transflective liquid crystal display device, wherein the color in the reflective region The reflection region and the transmission region are arranged such that the transmittance of the filter layer is 55% or more and 66% or less, and the transmittance of the color filter layer in the transmission region is 40% or more and 50% or less. Wherein adjusting the type or concentration of the colorant of the color filter layer in a method of manufacturing a transflective liquid crystal display device.

According to the manufacturing method according to the second aspect of the present invention, it is not necessary to control the thickness of the color filter layer in the reflection area and the transmission area. Therefore, there is no need to form a recess in the substrate or resin layer in the transmission region,
It can be easily manufactured.

In the method for manufacturing a transflective liquid crystal display device according to a second aspect of the present invention, the color filter layer in the reflective region and the transmissive region has a saturation of 20 or more and 40 or less. It is preferable to adjust the type or concentration of the colorant of the color filter layer in the reflection region and the transmission region.

[0025]

Embodiments of the present invention will be described below with reference to the drawings. In the following embodiments, a simple matrix driving type STN liquid crystal display device will be described as an example. However, a transflective liquid crystal display device of the present invention uses a TFT (Thin).
Film Trasistor: Thin Film Transistor, MIM (Metal-
The present invention can be applied to an active matrix driving type liquid crystal display device using a switching element such as an insulator-metal). In the following embodiments, a liquid crystal display device having a polarizing plate will be described as an example. However, the transflective liquid crystal display device of the present invention is a guest-host type or polymer dispersion type liquid crystal display device that does not require a polarizing plate. Can be adapted.
Further, in a reflective liquid crystal display device, a transmissive region is formed in a pixel, and the present invention can be applied to a liquid crystal display device that can be used for both a reflective type and a transmissive type.

Embodiment 1 FIG. 1 is a diagram schematically showing a cross section of a transflective color liquid crystal display device of Embodiment 1. The display device of the present embodiment includes a substrate 11, an opposing substrate 21 opposing the substrate 11, and a liquid crystal layer 3 interposed between the substrates 11 and 21. As the two substrates 11 and 21, a glass substrate or a plastic substrate having optical transparency can be used.

On a substrate 11, a reflective layer 12 made of a metal such as aluminum or silver or an alloy thereof is formed.
(Red) A color filter layer 13 of each color of G (green) and B (blue), an overcoat layer (flattening layer) 14 for reducing unevenness of the color filter layer 13, and a plurality of drives extending in parallel with each other. The electrodes 15 are sequentially formed. Further, a diffusion plate 22, a phase difference plate 23, and a polarizing plate 24 are sequentially formed on the viewer side of the counter substrate 21. On the liquid crystal layer 3 side of the counter substrate 21, a plurality of drive electrodes 25 orthogonal to the plurality of drive electrodes 15 on the substrate 11 and extending in parallel with each other.
Are formed. Alignment films (not shown) for aligning liquid crystal molecules in the liquid crystal layer 3 are formed on the two drive electrodes 15 and 25, respectively. A backlight (not shown) is provided outside the substrate 11 (on the side opposite to the observer). Note that a protective film such as SiO ₂ or SiN may be formed on the reflective layer 12.

The liquid crystal display device of this embodiment has a plurality of pixel regions 10a formed in a matrix, and each pixel region 10a reflects light incident from the counter substrate 21 side by the reflection layer 12. Reflection region 10b and substrate 11
And a transmission region 10c for transmitting the light incident from the side to the counter substrate 21 side. The pixel region 10a is a region that contributes to display. In the present embodiment, the pixel region 10a is defined by the drive electrode 15 of the substrate 11 and the drive electrode 25 of the counter substrate 21, and is located in a direction perpendicular to the surface of the substrate 11. This is an area where the drive electrodes 15 and 25 overlap. Reflection area 1
0b and the transmissive region 10c are regions determined by the presence or absence of the reflective layer 12, and thus may include a region 10d other than the pixel region 10a, in other words, a region that does not contribute to display.

FIGS. 2A to 2D show the transmission region 10c.
The following shows an example of the pattern. FIG. 2A shows each pixel region 10.
FIG. 2B shows a case in which each pixel region 10a has two rectangular transmission regions 10c, and FIG. 2B shows a case in which each pixel region 10a has two rectangular transmission regions 10c. FIG. 2 (c)
FIG. 2D shows a case where each pixel region 10a has one band-shaped transmission region 10c, and FIG. 2D shows a case where each pixel region 10a has two band-shaped transmission regions 10c. FIGS. 2A and 2B show patterns of the transmission region 10c.
2 (c) and 2 (d), and may take various pattern shapes.

The area ratio of the transmissive region 10c to the pixel region 10a on the same plane is preferably 20% or more and 45% or less, and particularly preferably about 30% in terms of brightness and saturation of reflective display and transmissive display. If it is less than 20%, the transmitted light is less used, and the screen at the time of transmissive display becomes dark. If it exceeds 45%, the screen at the time of reflective display becomes dark, which may cause a problem in visibility.

The reflection area 10b may be formed not only in the pixel area 10a but also in an area 10d between adjacent pixel areas 10a. In this case, the color filter layer 13 in the reflection area 10b functions as a black matrix in transmissive display. Note that the adjacent pixel region 1
When the reflection area 10b is not formed in the area 10d between 0a, the area 10d functions as a light absorption area in reflective display.

The substrate 11 in the transmission region 10c is provided with a concave portion 11a, and the concave portion 11a is filled with a color filter material constituting the color filter layer 13. Therefore, the thickness of the color filter layer 13 in the transmission region 10c is only the depth of the concave portion 11a (strictly speaking,
The thickness of the color filter layer 13 in the reflection region 10b is larger than the thickness of the color filter layer 13 in the reflection region 10b. In this embodiment, when the thickness of the color filter layer 13 in the reflection region 10b is d1 and the thickness of the color filter layer 13 in the transmission region 10c is d2, 1.3 ≦ d2 / d1 ≦
3.0, preferably 1.8 ≦ d2 / d1 ≦ 2.2.

In this embodiment, the transmittance of the color filter layer 13 in the reflection region 10b is set to 55% or more and 66% or less by making the thickness of the color filter layer 13 different between the reflection region 10b and the transmission region 10c. Area 1
The transmittance of the color filter layer 13 at 0c is set to 40% or more and 50% or less. Further, the saturation of the color filter layer 13 in the reflection region 10b and the transmission region 10c is both set to 20 or more and 40 or less.

The display operation of the liquid crystal display device of the present embodiment will be outlined. When the periphery is dark, a backlight (not shown) provided outside the substrate 11 is used as a transmissive liquid crystal display device. In the transmission region 10c, light emitted from the backlight and incident from the substrate 11 side passes through the color filter layer 13, the liquid crystal layer 3, and the like, and
Exit to one side and enter the observer's eyes. As described above, when the transmissive type is used by using the transmissive region 10c, the light of the backlight passes through the color filter layer 13 once.

On the other hand, when the surroundings are bright, it is used as a reflection type liquid crystal display device using external light. Reflection area 10
b, light incident from the counter substrate 21 side passes through the liquid crystal layer 3, the color filter layer 13, and the like, is reflected by the reflection layer 12, passes through the color filter layer 13, the liquid crystal layer 3, and the like again, and It goes out to the substrate 21 side and enters the observer's eyes. When the reflective region 10b is used as a reflective type as described above, external light passes through the color filter layer 13 twice.

In the present embodiment, since the setting of the transmittance of the color filter layer 13 is changed between the reflection area 10b and the transmission area 10c, appropriate brightness and color are obtained both in the transmissive display and the reflective display. And a good display quality can be realized. Further, since the saturation of the color filter layer 13 in the reflection region 10b and the transmission region 10c is both 20 or more and 40 or less, appropriate saturation can be obtained both in the reflective display and the transmissive display.

Next, a method for manufacturing the liquid crystal display device of the present embodiment will be described. First, a substrate 11 such as a glass substrate
A reflective layer 12 is formed thereon by depositing a metal such as aluminum or silver or an alloy thereof. In this embodiment,
An aluminum film is deposited to a thickness of 0.1 μm. A photoresist is applied on the reflection layer 12, exposed and developed, and the reflection layer 12 in the transmission region 10c is etched. The etching may be any of wet and dry etching methods. Further, the substrate 11 in the transmission region 10c is etched using hydrofluoric acid or the like to form the recess 11
a is formed.

The color filter material forming the color filter layer 13 is filled in the concave portion 11 a of the substrate 11 and applied on the substrate 11 to form the color filter layer 13. At this time, it is desirable to use a highly flat liquid containing a colorant (pigment or dye) as a color filter material. As a method for forming the color filter layer 13, a dyeing method, a pigment dispersion method, a printing method, an inkjet method, an electrodeposition method, a transfer method, or the like can be used. The color filter layer 13 is formed by repeating the same process for each color of red, green and blue. For example, a negative resist mixed with a red pigment is applied by a spinner, and the reflection area 10b and the transmission area 10c of the red pixel are exposed and developed to form the color filter layer 13 on the red pixel. When the depth of the concave portion 11a of the substrate 11 is 1 μm, 1 μm
When the color filter material is applied to a thickness of m, the thickness becomes 1 μm in the reflection area 10b and 2 μm in the transmission area 10c. That is, the reflection area 1
0b, the thickness of the color filter layer 13 in the transmission region 10c is d1, and the thickness of the color filter layer 13 in the transmission region 10c is d2.
Then, d2 / d1 = 2.

The thickness of the color filter layer 13 is set so that the transmittance and the saturation of the color filter layer 13 in the reflection region 10b and the transmission region 10c fall within the above ranges.
It is appropriately determined in consideration of the type or concentration of the colorant (pigment or dye) contained in the color filter material. Note that a black matrix may be formed of a light-absorbing substance in a region 10d other than the pixel region 10a, thereby improving the shielding power of the black matrix and contributing to higher contrast.

When there is an overlapping portion of the color filter layers 13 of each color, or when the thickness of the color filter layers 13 is different for each color, the surface of the color filter layer 13 becomes uneven, and the orientation of the liquid crystal molecules is poor. Become. An acrylic resin-based overcoat layer (flattening layer) 14 is formed on the color filter layer 13 in order to reduce the unevenness of the color filter layer 13. Further, a plurality of drive electrodes 15 extending in parallel to each other are formed by depositing and etching ITO (indium tin oxide) on the overcoat layer 14.

By depositing and etching ITO (indium tin oxide) on one surface of the counter substrate 21,
A plurality of drive electrodes 25 which are orthogonal to the plurality of drive electrodes 15 on the substrate 11 and extend in parallel with each other are formed. Polyimide is applied on each of the drive electrodes 15 and 25 of the substrate 11 and the counter substrate 21 by printing and baked to form an alignment film (not shown).
° Rubbing treatment is performed so as to be twisted.

After the substrate 11 and the opposing substrate 21 are bonded together with a sealing resin, a liquid crystal material whose birefringence Δn and pitch have been adjusted is injected to form an STN liquid crystal cell. On the side of the counter substrate 21 of the STN liquid crystal cell, a diffusion plate 22 and a desired d △ n
Are attached to the polycarbonate-stretched retardation plate 23 and the neutral gray polarizing plate 24, respectively. The polarizing plate 24 is attached to the liquid crystal cell so as to have a predetermined axis. A backlight (not shown) is provided outside the substrate 11 to complete a transflective liquid crystal display device.

(Embodiment 2) FIG. 3 is a diagram schematically showing a cross section of a transflective color liquid crystal display device of Embodiment 2. Note that components that are the same as or similar to those of the liquid crystal display device of Embodiment 1 are given the same reference numerals, and descriptions thereof are omitted.

The liquid crystal display device of the present embodiment is different from the liquid crystal display device of the first embodiment in that the surface of the substrate 11 on the liquid crystal layer 3 side is formed in an uneven shape. In order to form the surface of the substrate 11 into an uneven shape, for example, etching using hydrofluoric acid or the like can be performed. By forming the surface of the substrate 11 in a concavo-convex shape, a light diffusing function is provided, so that the diffusing plate 22 of the first embodiment can be omitted.

(Embodiment 3) FIG. 4 is a diagram schematically showing a cross section of a transflective color liquid crystal display device of Embodiment 3. Note that components that are the same as or similar to those of the liquid crystal display device of Embodiment 1 are given the same reference numerals, and descriptions thereof are omitted.

The liquid crystal display device of the present embodiment has a point that a resin layer 16 is formed between the substrate 11 and the reflection layer 12.
This is different from the liquid crystal display device of the first embodiment. A concave portion 16a is provided in the transmission region 10c of the resin layer 16, and the concave portion 16a
The inside is filled with a color filter material constituting the color filter layer 13. In the present embodiment, by adjusting the depth of the concave portion 16a of the resin layer 16, the transmission region 1 is adjusted.
The thickness of the color filter layer 13 at 0c can be controlled. Therefore, the depth of the concave portion 16a of the resin layer 16 can be adjusted by the etching selectivity between the substrate 11 and the resin layer 16, thereby controlling the thickness of the color filter layer 13 in the transmission region 10c. it can.

The resin layer 16 can be formed by a method such as exposure, embossing, and thermal baking. The concave portion 16a of the resin layer 16 can be formed by etching the resin layer 16 using oxygen plasma or the like. When oxygen plasma is used, the resist can be continuously stripped, and the number of steps can be reduced.

Further, a photosensitive (photopolymerizable or photodegradable) material is previously blended in the resin
Can also be given photosensitivity. In this case, the recess 16a can be formed in the resin layer 16 by exposure and development.

The liquid crystal display of the present embodiment has the resin layer 16
Is flat, a diffusion plate 22 for diffusing the reflected light is provided on the viewer side of the counter substrate 21. In addition, the polycarbonate-stretched first retardation plate 23a, second retardation plate 23b, and third retardation plate 2 having a desired d △ n
3c, a neutral gray first polarizer 24
a and the second polarizing plate 24b are attached to the liquid crystal cell so as to have a predetermined axis.

(Embodiment 4) FIG. 5 is a diagram schematically showing a cross section of a transflective color liquid crystal display device of Embodiment 4. Note that the same or similar components as those of the liquid crystal display device according to the first or third embodiment are denoted by the same reference numerals, and description thereof is omitted.

The liquid crystal display device of the present embodiment has the resin layer 16
The liquid crystal display device of the third embodiment is different from the liquid crystal display device of the third embodiment in that the surface of the liquid crystal layer 3 on the liquid crystal layer 3 side is formed in an uneven shape. In order to form the surface of the resin layer 16 into an uneven shape, for example, a positive photoresist having a property of melt flow by post-baking is used. Specifically, the resin layer 16 is formed by applying this photoresist, exposing and developing with a mask that shields only the reflection region 10b. When the resin layer 16 is post-baked, the resist is deformed by the melt flow, so that the resin layer 16 having an uneven surface can be formed. In the liquid crystal display device of the present embodiment, since the surface of the resin layer 16 is formed in an uneven shape and a light diffusion function is provided, the diffusion plate 22 of the third embodiment can be omitted.

(Embodiment 5) FIG. 6 is a diagram schematically showing a cross section of a transflective color liquid crystal display device of Embodiment 5. Note that components that are the same as or similar to those of the liquid crystal display device of Embodiment 1 are given the same reference numerals, and descriptions thereof are omitted.

The liquid crystal display of this embodiment is different from the liquid crystal display of Embodiment 1 in which the color filter layer 13 is formed on the substrate 11 in that the color filter layer 13 is formed on the counter substrate 21. . In the present embodiment, the concave portion 21a is formed on the liquid crystal layer 3 side of the opposing substrate 21, and the concave portion 21a is formed.
The inside is filled with a color filter material constituting the color filter layer 13. Therefore, the thickness of the color filter layer 13 in the transmission region 10c is larger than the thickness of the color filter layer 13 in the reflection region 10b by the depth of the concave portion 21a.

As in the second embodiment, the surface of the substrate 11 on the side of the liquid crystal layer 3 may be formed in an uneven shape, whereby the diffusion plate 22 can be omitted. Further, a resin layer may be provided between the counter substrate 21 and the color filter layer 13, and a concave portion may be formed in the transmission region 10c of the resin layer. In this case, by adjusting the depth of the concave portion of the resin layer,
The thickness of the color filter layer 13 in the transmission region 10c can be controlled.

(Embodiment 6) FIG. 7 is a diagram schematically showing a cross section of a transflective color liquid crystal display device of Embodiment 6. Note that components that are the same as or similar to those of the liquid crystal display device of Embodiment 1 are given the same reference numerals, and descriptions thereof are omitted.

The liquid crystal display device of this embodiment has the reflection region 1
The point that the film thickness of the color filter layer 13 is substantially the same between 0b and the transmission region 10c is different from the liquid crystal display device of the first embodiment in which the film thickness of the color filter layer 13 is different between the two regions 10b and 10c. However, in the present embodiment, the type or concentration of the colorant contained in the color filter layer 13 differs between the reflection region 10b and the transmission region 10c. In the present embodiment, the reflection region 1 is adjusted by adjusting the type or concentration of the colorant.
0b and the color filter layer 1 in the transmission region 10c
3 is controlled so that the transmittance and the saturation of the color No. 3 fall within the above ranges.

In this embodiment, the color filter layer 13 is formed in the reflection region 10b and the transmission region 10c for each of the colors red, green, and blue by different steps. Also in the present embodiment, the color filter layer 13 can be formed using a dyeing method, a pigment dispersion method, a printing method, an inkjet method, an electrodeposition method, a transfer method, or the like. Here, the different types of colorants refer to colorants of similar colors that have different transmittance or saturation of the color filter layer when mixed at the same concentration. In addition, not only the type of the color filter layer 13 but also the density thereof may be adjusted to be different between the reflection region 10b and the transmission region 10c.

In this embodiment, since it is not necessary to control the thickness of the color filter layer 13 in the reflection area 10b and the transmission area 10c, the substrate 1 in the transmission area 10c is not required.
There is no need to form recesses in the first and second resin layers 16 or the resin layer 16, and it can be easily manufactured.

As in the second embodiment, the surface of the substrate 11 on the liquid crystal layer 3 side may be formed in an uneven shape, or, similarly to the fourth embodiment, the surface of the resin layer provided on the substrate 11. May be formed in an uneven shape. Thereby, the diffusion plate 22 can be omitted. Further, the color filter layer 13 may be provided on the counter substrate 21.

(Test Example 1) In the liquid crystal display device of Embodiment 5, various samples in which the transmittance and the saturation of the color filter layer 13 were variously changed were prepared, and their appearance (brightness and hue) were evaluated. , Comprehensive judgment was made. In the liquid crystal display device, the aperture ratio (the area ratio of the transmission region to one pixel region) is 30%, the opening pattern of the transmission region 10c is the pattern shown in FIG. 2A, and the driving condition is 1/80 Du.
ty, 1/9 Bias, and a frame frequency of 80 Hz. The color filter layer 13 is set such that the transmittance of the color filter layer in the reflection region 10b is 55% to 70%.
The concentration of the pigment contained in was adjusted. Further, the transmission region 10
c, the thickness of the color filter layer 13 is
The depth of the concave portion formed in the resin layer is set to 0.3 to 2.0 times the thickness of the color filter layer 13 in the reflection region 10b so that the thickness becomes 1.3 to 3.0 times the thickness of b. To prepare a sample.

Table 1 shows the results. The Y value in the table indicates the transmittance of the set target. The transmittance and saturation of the color filter layer 13 are determined by Olympus OSP-2000 (C light source 2).
° field of view, glass reference). R
By measuring the transmission spectral characteristics of each of the colors (red), G (green), and B (blue), the Y value of each of R (red), G (green), and B (blue)
The x value and the y value (XYZ color system) are obtained. The transmittance is R
(Red), G (Green), and B (Blue) were represented by average values of Y values. The saturation is calculated by plotting the x and y values of R (red), G (green), and B (blue) on chromaticity coordinates xy and multiplying the area of a triangle obtained by connecting the chromaticity coordinates by 1000. Value. The display quality was evaluated visually. In each evaluation and judgment, “◎” is excellent,
“○” indicates that the line can be used, “△” indicates that the line is usable and unusable, and “×” indicates that the line cannot be used. In the overall judgment of each sample (at the time of transmission), the result of the overall judgment at the time of each reflection is added. In the column of the film thickness and transmittance of the color filter layer (CF) in the table, numerical values in parentheses represent the ratio of the CF to the film thickness and transmittance in the reflection region, respectively.

[0062]

[Table 1]

From the results shown in Table 1, when the transmittance of the color filter layer 13 in the reflection region 10b is Y = 50%, the reflection display becomes dark, and when the transmittance is Y = 70%, the saturation becomes low and the color becomes pale. It can be seen that none of them are suitable for use. Color filter layer 1 in reflection area 10b
When the transmittance of Y is 55 = 60, 65%, the brightness and chroma during reflective display are appropriate, but the display quality during transmissive display varies. That is, when the transmittance of the color filter layer 13 in the transmission region 10c is 40% to 50%, or when the saturation of the color filter layer 13 is 20 to 40, the brightness and the saturation during the transmissive display are displayed. Is appropriate, and in other cases, the brightness or saturation at the time of transmissive display is insufficient.

In particular, when the thickness of the color filter layer 13 in the reflection area 10b is d1 and the thickness of the color filter layer 13 in the transmission area 10c is d2, 1.8 ≦ d
A sample having a relationship of 2 / d1 ≦ 2.2 is preferable because the display quality is good and the saturation is the same in both the reflective display and the transmissive display.

(Test Example 2) In the liquid crystal display device of Embodiment 6, the color filter layer 13 in the transmission region 10c was used.
Various samples in which the kind or the concentration of the colorant in the medium was variously prepared were prepared, and the appearance (brightness, hue) was evaluated in the same manner as in Test Example 1, and a comprehensive judgment was made. Table 2 shows the results.

[0066]

[Table 2]

From the results shown in Table 2, as in Test Example 1, the transmittance of the color filter layer 13 in the reflection region 10b was Y
At = 53%, the reflection display becomes dark, which indicates that it is not suitable for use. On the other hand, when the transmittance of the color filter layer 13 in the reflection area 10b is Y = 60, 66%, the brightness and the saturation in the reflection display are appropriate, but the display quality in the transmission display is various, and the transmission area is various. 10c, the transmittance of the color filter layer 13 is 40% to 50%, or the saturation of the color filter layer 13 is 20 to 4%.
When it is 0, the brightness and saturation during the transmissive display are appropriate, and in other cases, the brightness or chroma during the transmissive display is insufficient.

[0068]

According to the transflective liquid crystal display device of the present invention, it is possible to realize appropriate brightness and color in both transmissive display and reflective display. Further, according to the manufacturing method of the present invention, the transflective liquid crystal display device of the present invention can be easily manufactured.

[Brief description of the drawings]

FIG. 1 is a diagram schematically illustrating a cross section of a transflective color liquid crystal display device according to a first embodiment.

FIG. 2 is a plan view illustrating an example of a pattern of a transmission region 10c.

FIG. 3 is a diagram schematically illustrating a cross section of a transflective color liquid crystal display device according to a second embodiment.

FIG. 4 is a diagram schematically illustrating a cross section of a transflective color liquid crystal display device according to a third embodiment.

FIG. 5 is a diagram schematically illustrating a cross section of a transflective color liquid crystal display device according to a fourth embodiment.

FIG. 6 is a diagram schematically illustrating a cross section of a transflective color liquid crystal display device according to a fifth embodiment.

FIG. 7 is a diagram schematically illustrating a cross section of a transflective color liquid crystal display device according to a sixth embodiment.

[Explanation of symbols]

 Reference Signs List 10a Pixel region 10b Reflection region 10c Transmission region 11 Substrate 12 Reflective layer 13 Color filter layer 14 Overcoat layer (flattening layer) 15 Drive electrode 16 Resin layer 21 Counter substrate 22 Diffusion plate 23 Phase difference plate 24 Polarizer 25 Drive electrode 3 Liquid crystal layer

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H042 DA02 DA12 DA14 DA22 DB01 DC02 DD09 DE00 2H048 BA02 BA45 BB01 BB02 BB07 BB08 BB10 BB42 2H090 HA04 JA02 LA01 LA04 LA09 LA15 LA20 2H091 FA02Y FA08X FA08Z FA14 LA17 GA01 LA01 LA18

Claims (10)

[Claims] A substrate on which a reflection layer for reflecting light is formed; a counter substrate facing the substrate; and a liquid crystal layer interposed between the substrate and the counter substrate. A plurality of pixel regions each having a reflection region that reflects light incident from the substrate by the reflection layer and a transmission region that transmits light incident from the substrate side to the counter substrate side are formed in a matrix, and are formed on the reflection layer or A transflective liquid crystal display device, wherein a color filter layer is provided on the counter substrate, wherein a transmittance of the color filter layer in the reflection region is 55% or more and 66% or less, and the color in the transmission region is A transflective liquid crystal display device wherein the transmittance of the filter layer is 40% or more and 50% or less. 2. The color filter layer according to claim 1, wherein the saturation of the color filter layer in the reflection area and the transmission area is 20 to 40.
The transflective liquid crystal display device according to claim 1, wherein: 3. When the thickness of the color filter layer in the reflection area is d1 and the thickness of the color filter layer in the transmission area is d2, 1.3 ≦ d2 / d1.
3. The transflective liquid crystal display device according to claim 1, having a relationship of ≤3.0. 4. A resin layer and the color filter layer are sequentially formed on the substrate or the counter substrate, and the resin layer in the transmission region is provided with a concave portion on the color filter layer side, The thickness of the color filter layer differs between the reflection region and the transmission region,
The transflective liquid crystal display device according to claim 1. 5. The transmittance or saturation of the color filter layer in the reflection region and the transmission region is adjusted by adjusting the type or concentration of the colorant in the color filter layer in the reflection region and the transmission region. The transflective liquid crystal display device according to claim 1, wherein the liquid crystal display device is set. 6. A substrate on which a reflection layer for reflecting light is formed, a counter substrate facing the substrate, and a liquid crystal layer interposed between the substrate and the counter substrate. A plurality of pixel regions each having a reflection region that reflects light incident from the substrate by the reflection layer and a transmission region that transmits light incident from the substrate side to the counter substrate side are formed in a matrix, and are formed on the reflection layer or A method for manufacturing a transflective liquid crystal display device provided with a color filter layer on the counter substrate, comprising: forming the resin layer on the substrate or the counter substrate; Forming a concave portion having a depth, and filling a material of the color filter layer in the concave portion, and forming the color filter layer on the resin layer. The transmittance of the color filter layer in the reflection region and the transmission region is set so that the transmittance of the filter layer is 55% or more and 66% or less and the transmittance of the color filter layer in the transmission region is 40% or more and 50% or less. A method for manufacturing a transflective liquid crystal display device that controls a film thickness. 7. The saturation of the color filter layer in the reflection area and the transmission area is 20 or more and 40 or more.
The method for manufacturing a transflective liquid crystal display device according to claim 6, wherein the thickness of the color filter layer in the reflection region and the transmission region is controlled as follows. 8. When the thickness of the color filter layer in the reflection area is d1 and the thickness of the color filter layer in the transmission area is d2, 1.3 ≦ d2 / d1.
8. The method according to claim 6, wherein the thickness of the color filter layer in the reflection region and the transmission region is controlled so as to have a relationship of ≦ 3.0. 9. A semiconductor device comprising: a substrate on which a reflective layer for reflecting light is formed; a counter substrate facing the substrate; and a liquid crystal layer interposed between the substrate and the counter substrate. A plurality of pixel regions having a reflection region that reflects light incident from the reflective layer by the reflective layer and a transmissive region that transmits light incident from the substrate side to the counter substrate side are formed in a matrix, and are formed on the reflective layer or A method of manufacturing a transflective liquid crystal display device, comprising: a color filter layer provided on the counter substrate, wherein a transmittance of the color filter layer in the reflective region is 55% or more and 66% or less. The type or concentration of the colorant of the color filter layer in the reflection region and the transmission region is set such that the transmittance of the color filter layer is 40% or more and 50% or less. To integer, manufacturing method of a transflective liquid crystal display device. 10. The saturation of the color filter layer in each of the reflection area and the transmission area is 20 or more.
The method of manufacturing a transflective liquid crystal display device according to claim 9, wherein a type or a concentration of a colorant of the color filter layer in the reflection region and the transmission region is adjusted so as to be 0 or less.