JP2003330008A - Color filter for transflective liquid crystal display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transflective color filter having identical color characteristics both in reflective display and in transmissive display and further being easily formed. <P>SOLUTION: The transflective color filter has a transparent substrate and a transparent film pattern region where a transparent film pattern layer consisting of a transparent film formed on the transparent substrate in a patterned shape and a coloring layer formed so as to cover the transparent film pattern layer are laminated. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color filter used in a transflective liquid crystal display device.

[0002]

2. Description of the Related Art A semi-transmissive / semi-reflective color liquid crystal display device has a backlight in addition to the conventional reflective color liquid crystal display device that uses external light for display, and displays with a backlight even when the surroundings are dark. It is a liquid crystal display device capable of (transmissive display).

In a semi-transmissive / semi-reflective color liquid crystal display device using an ordinary color filter, external light passes through the color filter twice during reflective display. Further, there is a drawback that the color characteristic is different between the reflective display and the transmissive display because the color filter passes once during the transmissive display.

Therefore, conventionally, in order to match the color characteristics, the backlight light transmitting portion and the external light reflecting portion form separate color characteristic color filters, or a pinhole is provided in the external light reflecting portion. Was formed.

However, in the structure in which the backlight light transmitting portion and the external light reflecting portion form separate color characteristic color filters, the number of steps is doubled and a pinhole is formed in the external light reflecting portion. The structure to be formed has problems such as difficulty in patterning.

Further, as an example, as in the color filter 1 shown in FIG. 12, by forming a single transparent layer 3 between the substrate 2 and the coloring layer 4 in the reflected light region 5, the thickness of the coloring layer is reduced. Although it has been proposed to form the liquid crystal display device in half, it is difficult to make the film thicknesses of the reflected light region 5 provided with the transparent layer and the transmitted light region 6 of only the colored layer constant. However, there is a problem in that the transparent electrode such as ITO formed on the color filter is broken and the gap is not constant when the above structure is constructed.

[0007]

Therefore, it is desired to provide a semi-transmissive / semi-reflective color filter which has the same color characteristics during reflective display and transmissive display and is easy to form.

[0008]

According to a first aspect of the present invention, there is provided a transparent substrate, a transparent film pattern layer formed by patterning a transparent film on the transparent substrate, and the transparent film. Provided is a color filter for a semi-transmissive-semi-reflective liquid crystal display device, which has a transparent film pattern region formed by laminating a colored layer formed so as to cover the pattern layer.

According to the present invention, since the transparent film has the transparent film pattern region in which the transparent film is formed in a pattern on the transparent substrate, the color characteristics of the reflected light region or the transmitted light region can be adjusted. This makes it possible to provide a color filter for a semi-transmissive / semi-reflective liquid crystal display device in which the color characteristics of the reflected light region and the transmitted light region are the same.

According to a first aspect of the present invention, as described in the second aspect, the transparent film pattern region is used as a region for reflected light, and the transparent substrate and a colored layer formed on the transparent substrate. The colored layer region having and can be used as the transmitted light region. In contrast to the colored layer region that does not have a transparent film, the transparent film pattern region has a pattern of a transparent film, so that the color purity is lightened as compared with the transmitted light of the colored layer only. Even when the external light passes through the transparent film pattern region twice, the same color characteristics as when the backlight passes through the colored layer region once can be obtained. From this, by using this transparent film pattern area as the area for reflected light,
It is possible to make the color characteristics of the reflected light area equal to the color characteristics of the transmitted light area.

Further, in the invention described in claim 1,
As described in claim 3, the transparent film pattern region is used as a region for transmitted light, the transparent substrate, a transparent film uniform layer formed by uniformly forming a transparent film on the transparent substrate, and a transparent film uniform layer. You may use the transparent film uniform area | region which laminated | stacked the coloring layer formed one layer above as the area | region for reflected light.

In the transparent film pattern region, the transparent film is formed in a pattern, and the transparent film uniform region has the transparent film uniformly formed on the entire surface. Therefore, the transparent film uniform region is transparent. Compared to the film pattern area, the transparent film has a larger influence, and it is possible to make the color purity when light is transmitted lighter. From this, it is possible to have the same color characteristics when the backlight passes through the transparent film pattern area once and when the outside light passes through the transparent film uniform area twice. By using the area as the reflected light area and the transparent film pattern area as the transmitted light area, it is possible to approximate the color characteristics in the transmitted light area and the reflected light area.

Further, since the transparent film is provided on the transparent substrate in the transparent film uniform region, when the colored layer is formed on the transparent film, the film thickness becomes a transparent film pattern region having a pattern on the transparent substrate. It becomes possible to make it uniform.

In the invention described in claim 3, as described in claim 4, the area ratio of the area where the transparent film is formed in the transparent film pattern area is (transparent film forming area / transparent film). Pattern area area) = 0.3 to 0.5
It is preferably within the range.

The area ratio of the area where the transparent film is formed in the transparent film pattern area is the best within the above range in the current processing accuracy, and the area ratio of the reflected light area and the transmitted light area is the same. The color characteristics can be closest to each other. Further, when the area ratio of the region where the transparent film is formed in the transparent film pattern region is smaller than the above range, it becomes difficult to make the film thickness uniform in the reflected light region and the transmitted light region, When it is larger than the range, it is difficult to bring the color characteristics close to each other, which is not preferable.

In the invention described in claim 4, as described in claim 5, the thickness of the transparent film forming the transparent film pattern layer and the transparent film uniform layer is the same as that of the colored layer. When the thickness of the colored layer is 1 when the colored layer is used for the transmitted light region, the thickness is preferably in the range of 0.5 to 3.0. In the case where the film thickness of the transparent film forming the transparent film pattern layer and the transparent film uniform layer is within the above range, and is the area ratio of the region where the transparent film is formed in the transparent film pattern region described above. The color characteristics in the reflected light region and the transmitted light region can be made closer to each other.

In the invention described in any one of claims 1 to 5, as described in claim 6, in the transparent film pattern layer, the transparent film is formed in an island shape. The transparent film pattern layer may have a pattern in which holes are formed in a pattern in the transparent film, as described in claim 7. These are appropriately selected and used depending on the apparatus and conditions at the time of manufacture.

In the invention described in any one of claims 1 to 7, as described in claim 8, a portion of the transparent film pattern layer formed in an island shape or The holes are preferably formed in a circular shape. The island-shaped portion or hole of the transparent film pattern layer is formed in a circular shape,
At the time of manufacturing the semi-transmissive-semi-reflective color filter, it becomes easy to adjust and design the above-mentioned area ratio and to form a pattern, which is also preferable in terms of manufacturing efficiency and the like.

In the invention described in any one of claims 1 to 8, as described in claim 9, the transparent film pattern layer, or the transparent film pattern layer and the transparent film. The film thickness of the transparent film forming the film uniform layer is preferably 0.5 to 3.5 μm.

By setting the film thickness of the transparent film pattern layer, or the transparent film pattern layer and the transparent film uniform layer within the above range, in an ordinary color filter,
This is because the color characteristics of the reflected light region and the transmitted light region can be made closest to each other.

In the invention described in any one of claims 1 to 9, as described in claim 10, the wavelength of the transparent film is 380 nm to 780 n.
The spectral transmittance at m is preferably 85% or more.

When the transparency of the transparent film is within the above range, in the color filter for a semi-transmissive-semi-reflective liquid crystal display device of the present invention, there is little influence on the color characteristics of the colored layer. This is because the color characteristics of the reflected light region and the transmitted light region can be made closer to each other.

The present invention is as set forth in claim 11.
A transflective liquid crystal display device comprising the color filter for transflective liquid crystal display device according to any one of claims 1 to 10.

According to the present invention, by having the above-described color filter for the semi-transmissive-semi-reflective liquid crystal display device, it is possible to obtain a liquid crystal display device having the same color characteristics in the transmitted light region and the reflected light region. Because it will be.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a semi-transmissive semi-reflective color filter and a semi-transmissive semi-reflective liquid crystal display device using the semi-transmissive semi-reflective color filter. These will be described below.

A color filter for a transflective liquid crystal display device according to the present invention comprises a transparent substrate, a transparent film pattern layer formed by patterning a transparent film on the transparent substrate, and the transparent film pattern layer. It has a transparent film pattern region formed by laminating a colored layer formed so as to cover it. A color filter for a semi-transmissive-semi-reflective liquid crystal display device according to the present invention has a transparent film formed in a pattern on a transparent substrate to adjust the color characteristics of a reflected light region or a transmitted light region. This makes it possible to provide a color filter for a semi-transmissive semi-reflective liquid crystal display device in which the color characteristics of the reflected light area and the transmitted light area are the same.

The present invention can be divided into a first embodiment in which the transparent film pattern area is used as a reflected light area and a second embodiment in which the transparent film pattern area is used as a transmitted light area.

As an example of the first embodiment, as shown in FIG. 1, a transparent film 3 formed in a pattern on a transparent substrate 2.
Also, the transparent film pattern area formed of the colored layer 4 formed thereon is used as the reflected light area 6, and the colored layer area having the colored layer 4 formed on the transparent substrate 2 is used as the transmitted light area. The color filter for a semi-transmissive / semi-reflective liquid crystal display device used in No. 5 can be obtained.

As an example of the second embodiment, as shown in FIG. 2, a transparent film 3 formed in a pattern on a transparent substrate 2.
And the transparent film pattern region formed of the colored layer 4 is used as the transmitted light region 5, and the transparent film uniform upper region formed of the transparent film 3 and the colored layer 4 formed on the entire surface is used as the reflected light region 6. It can be used as a color filter for a reflective liquid crystal display device. These will be described below.

A. First Embodiment First, a first embodiment of the present invention will be described. The color filter for a semi-transmissive-semi-reflective liquid crystal display device according to the first embodiment of the present invention is a transparent film formed on a transparent substrate in a pattern, and the transparent film pattern comprising a colored layer formed thereon. And a colored layer region having a colored layer formed on the transparent substrate, wherein the transparent film pattern region serves as a reflected light region and the colored layer region serves as a transmitted light region.

In this embodiment, the transparent film pattern region used as the reflected light region has a pattern of a transparent film, so that the color purity is lighter than that in the case where light is transmitted through only the colored layer. It becomes possible. As a result, when the external light passes through the transparent film pattern area twice, the same color characteristics as when the backlight passes once through the colored layer area that does not have the transmitted light used as the transmitted light area. It is possible to These will be described below.

1. Transparent film pattern region The transparent film pattern region in the present embodiment is formed so as to cover the transparent substrate, the transparent film pattern layer formed by patterning the transparent film on the transparent substrate, and the transparent film pattern layer. It is characterized in that the colored layer is laminated.

Hereinafter, these will be described separately.

(Transparent Film) First, the transparent film in this embodiment will be described. The transparent film in this embodiment is formed on a transparent substrate described later, and it is possible to use a material used as a protective film or a spacer in a color filter. Is not particularly limited.

Specific materials used for such a transparent film include photosensitive acrylic resin, photosensitive polyimide, positive resist, cardo resin, polysiloxane, and benzocyclobutene.

Further, in this embodiment, it is preferable that the transparent film has a spectral transmittance of 85% or more, particularly 95% or more at a wavelength of 380 to 780 nm. The transparency of the transparent film is
By being in the above range, it is less likely to affect the color characteristics and the like of the coloring layer described later, when used in the reflected light region of the present embodiment, the reflected light region and the transmitted light region of This is because the color characteristics can be made closer.

Here, the spectral transmittance in this embodiment is measured by a spectrophotometer (MCPD-2 manufactured by Otsuka Electronics Co., Ltd.).
000) was used. A halogen lamp was used as the light source.

Further, in this embodiment, the thickness of the transparent film is preferably in the range of 0.5 to 3.5 μm, particularly 1.0 to 2.5 μm. When the thickness of the transparent film is within the above range, when the color filter for a semi-transmissive semi-reflective liquid crystal display device of this embodiment is used in the transflective liquid crystal display device, the reflected light region and This is because the color characteristics of the transmitted light region can be made closer to each other.

(Coloring Layer) Next, the coloring layer will be described. The colored layer in the present embodiment is a layer formed on the transparent substrate described below or on the transparent film described above, and the material etc. are particularly limited as long as it is used as a colored layer in a general color filter. It is not something that will be done. Generally, a colored layer used in a color filter for a liquid crystal display device has three primary colors of red (R), blue (B), and green (G),
In this embodiment, the shape and manufacturing method are the same for each color.

A general coloring layer material is composed of a pigment, a binder and additives thereof. The type of the binder varies depending on the method for producing the colored layer, but since the colored layer is generally formed by the pigment dispersion method, the material required for the pigment dispersion method is preferably used.

(Transparent Substrate) Next, the transparent substrate in this embodiment will be described. The transparent substrate used in this embodiment is a substrate on which a transparent film pattern layer and a colored layer are formed, and is not particularly limited as long as it has been conventionally used for a color filter, and for example, quartz. It is possible to use an inflexible transparent rigid material such as glass or a synthetic quartz plate, or a transparent transparent flexible material such as a transparent resin film or an optical resin plate. The transparent substrate may be subjected to surface treatment for the purpose of preventing alkali elution, imparting gas barrier properties or the like, if necessary.

(Transparent Film Pattern Area) Next, the transparent film pattern area in this embodiment will be described. The transparent film pattern region in this embodiment is a transparent film pattern layer formed by patterning the transparent film described above on the transparent substrate described above, and the colored layer described above so as to cover the transparent film pattern layer. This is a region formed on the entire surface.

The shape 7 of the pattern of the transparent film pattern layer in this embodiment may be circular as shown in FIG. 3 or square as shown in FIG. 4 as an example. Are evenly arranged, or, for example, those arranged in the closest packed form as shown in FIG. 5,
Alternatively, for example, they may be randomly arranged as shown in FIG. 6 and are not particularly limited.

The pattern of the transparent film in this embodiment is a pattern in which the transparent film is formed in an island shape, and
An example is a pattern in which holes are formed in a pattern in a transparent film. The shapes of these patterns are appropriately selected and used depending on the apparatus and conditions during manufacturing.
Here, it is more preferable that the island-shaped portions or holes of the transparent film pattern layer are formed in a circular shape. This is because when the island-shaped portion or hole is circular, it is easy to form a pattern and the area and the like are easily adjusted.

Further, in the pattern of this embodiment, it is preferable that the transparent film pattern layer is randomly formed.
This is because the transparent film pattern layer is randomly formed so that phase interference of transmitted light does not occur.

In the transparent film pattern region as described above, since the transparent film pattern layer is formed by the transparent film, it is possible to make the color purity lighter as compared with the layer having only the coloring layer. is there.

2. Colored Layer Region Next, the colored layer region in this embodiment will be described.
The colored layer region in this embodiment is a region in which the above-mentioned colored layer is uniformly formed on the entire surface of the above-mentioned transparent substrate.

The colored layer region in the present embodiment means that the colored layer is formed on the transparent substrate, and therefore, the colored layer in a normal color filter for a reflective liquid crystal display device or a color filter for a transmissive liquid crystal display device is used. It has the same configuration as.

The colored layer in the colored layer area is formed at the same time as the colored layer in the transparent film pattern area.
This makes it possible to reduce the number of manufacturing steps of the semi-transmissive-semi-reflective color filter of the present embodiment.

3. Color Filter for Transflective Liquid Crystal Display Device The color filter for transflective liquid crystal display device according to the present embodiment will be described. The color filter for a semi-transmissive / semi-reflective liquid crystal display device in the present embodiment has the transparent film pattern region and the colored layer region described above, and the transparent film pattern region is used as the reflected light region and the colored layer region is transmitted. The shape or the like is not particularly limited as long as it is used as a light area, and each pixel showing three primary colors of red (R), green (G), and blue (B) is in a stripe shape or in a zigzag manner. It may be arranged and configured in a shape.

In the present embodiment, since the transparent film pattern region has a pattern made of a transparent film, it is possible to make the color purity lighter as compared with the transmitted light of only the colored layer, and to Even when the light passes through the transparent film pattern area twice, it is possible to obtain the same color characteristics as when the backlight passes through the colored layer area once.

(Manufacturing Method) A method of manufacturing the color filter for the transflective liquid crystal display device according to the present embodiment will be described. The method for manufacturing the color filter for the transflective liquid crystal display device according to the present embodiment is not particularly limited as long as it is a method capable of forming the transparent film pattern region and the colored layer region described above. In this embodiment, the pattern of the transparent film is preferably manufactured by photolithography from the viewpoint of accuracy.

First, a step of forming a pattern layer of a transparent film on the transparent substrate in the transparent film pattern region is performed. In this step, for example, a transparent film-forming coating solution prepared by dissolving the above-described photosensitive transparent film-forming resin in a solvent is prepared, and this is applied uniformly by spin coating or the like.
After the coating solution is dried, a patterning method is performed such that the coating solution is exposed in a pattern so as to have a required pattern, and then developed, so that a transparent film pattern is formed.

Then, a step of forming a colored layer in the colored layer region and the transparent film pattern region is performed. For this step, a pigment dispersion method or a printing method such as an inkjet method which has been conventionally performed can be used, and the present invention is not particularly limited.

When the color filter for a transflective liquid crystal display device according to the present embodiment is manufactured by photolithography, it is manufactured by four steps including the step of forming a transparent film in the step of manufacturing a normal color filter. Therefore, it has an advantage that the formation is easy as compared with a configuration in which separate color filters are formed.

(Others) The semi-reflective semi-transmissive color filter of this embodiment may have a black matrix or another layer, such as a transparent electrode layer or a polarizing layer, if necessary. The positions and materials for forming these are the same as those of the conventional ones, and thus the description thereof is omitted here.

B. Second Embodiment A second embodiment of the present invention comprises a transparent film pattern region composed of a transparent film and a colored layer and a transparent film uniform region composed of a transparent film and a colored layer on the transparent substrate, and the transparent film pattern A color filter for a semi-transmissive-semi-reflective liquid crystal display device, wherein a region is used as a transmitted light region and the transparent film uniform region is used as a reflected light region.

Since the transparent film is uniformly formed on the entire surface in the transparent film uniform region in the present embodiment, the transparent film uniform region is less affected by the transparent film than the transparent film pattern region. It is possible to reduce the color purity when light is transmitted. From this, when the backlight passes through the transparent film pattern region once, and when the outside light passes through the color filter twice through the transparent film uniform region, it is possible to obtain the same color characteristics. By using the transparent film uniform region as the reflected light region and the transparent film pattern region as the transmitted light region, it is possible to make the transmitted light region and the reflected light region have the same color characteristics.

Furthermore, since the transparent film is provided on the transparent substrate in the transparent film uniform region, when the colored layer is formed on the transparent film, the transparent film pattern region having the pattern on the transparent substrate is formed. It becomes possible to make it uniform. These will be described below. Here, the transparent film, the colored layer, and the transparent substrate of this embodiment are the same as those of the first embodiment, and therefore the description thereof is omitted here.

1. Transparent film pattern region The transparent film pattern region in the present embodiment is formed so as to cover the transparent substrate, the transparent film pattern layer formed by patterning the transparent film on the transparent substrate, and the transparent film pattern layer. It is characterized in that it is laminated with the colored layer, and the constituent materials and the like are the same as those in the first embodiment, and therefore the description thereof is omitted here.

2. Transparent film uniform region The transparent film uniform region in the present embodiment will be described.
The transparent film uniform region in the present embodiment means a transparent film uniform layer in which the transparent film is uniformly formed on the entire surface of the transparent substrate, and a colored layer is uniformly formed on the transparent film uniform layer. Area. Here, the film thickness of the transparent film uniform layer is
It is the same as the thickness of the transparent film in the transparent film pattern layer described above.

Since the transparent film uniform layer is formed on the transparent substrate, the influence of the transparent film can be increased as compared with the transparent film pattern region described above. It is possible to bring the color characteristics that the light of the backlight passes once through the area and the color characteristics that the outside light passes twice through the transparent film uniform area closer to each other.

3. Semi-Transmissive-Semi-Reflective Color Filter A color filter for a semi-transmissive-semi-reflective liquid crystal display device in this embodiment will be described. The semi-transmissive-semi-reflective color filter in the present embodiment uses the transparent film pattern region described above as a transmitted light region, and the transparent film uniform region described above as a reflected light region, the shape and the like are particularly The present invention is not limited to this, and each pixel indicating the three primary colors of red (R), green (G), and blue (B) may be arranged in a stripe pattern or in a staggered pattern. The shape and the like are not particularly limited.

In this embodiment, since the transparent film is uniformly formed on the entire surface of the transparent film uniform region, when the backlight passes through the transparent film pattern region once and outside the transparent film uniform region. It is possible to have the same color characteristics when the light passes through the color filter twice.
From this, by using the transparent film uniform area as the reflected light area and the transparent film pattern area as the transmitted light area, it becomes possible to bring the color characteristics in the transmitted light area and the reflected light area closer to each other. .

Further, since the transparent film is formed on the entire surface of the transparent film uniform region, the film thickness of the transparent film uniform region and the transparent film pattern region can be made uniform.

Here, as shown in FIG. 7, in the first embodiment, since the transparent film pattern layer is used as the reflected light region 6, external light passes through the transparent film pattern layer twice. Therefore, when designing the color filter, it is necessary to take into consideration the case where incident light does not pass through the transparent film and reflected light passes through the transparent film, which may be complicated. In this respect, in this embodiment, since the transparent film pattern area is used as the transmitted light area 5, the light passing through the pattern area is only the backlight. Therefore, the optimum value of each configuration of the pattern area is relatively small. It becomes possible to easily optimize by simulation. Therefore, the optimum value of each configuration obtained by the simulation in this embodiment will be described below.

(Optimization by Simulation) The simulation in this embodiment will be described. The simulation was performed with a pattern in which holes were circularly formed in a transparent film.

FIG. 8 is a graph showing Δu'v 'and the film thickness in the area ratio of each color of the colored layer. Where Δ
u′v ′ is a value indicating the color difference in the transmissive film pattern region and the transmissive film uniform region and is a transmitted light region u′v ′.
When the chromaticity value (u _T ′, v _T ′) and the reflected light area u ′ v ′ chromaticity value (u _R ′, v _R ′),

[0069]

[Equation 1] Required from.

The point where the value of Δu′v ′ is the minimum indicates that the difference in color characteristics between the transparent film pattern region and the transparent film uniform region is the minimum, and can be obtained from FIG. Further, as is clear from FIG.
It is blue that the change in the value of u′v ′ is remarkable, and in red and green, the change in Δu′v ′ is small depending on the film thickness, so it is appropriate to obtain the optimum value from blue. Here, the area ratio is obtained from the diameter of the circular pattern and the pattern interval t as shown in FIG. 9, but as is clear from FIG. 8, the area where the transparent film is formed in the transparent film pattern area. The smaller the area ratio of
It is shown that the value of v'is small.

Here, as the minimum diameter of the circular pattern and the pattern interval t in FIG. 9, the diameter is 10 μm in view of the present technology and cost, and the pattern interval t is 4.0 μm. Is appropriate. Therefore, in FIG. 10, the pattern interval t when the diameter is 10 μm
And the area ratio. Thus, when the pattern interval t is 4.0 μm and the diameter is 10 μm, the area ratio is determined to be 0.4, whereby the color layer is blue and the area ratio is 0.4. , Δu′v ′ can be minimized from the blue graph in FIG. 8 to 1.3.

Here, the film thickness in this simulation is the combined film thickness of the transparent film and the colored layer when the film thickness when the colored layer alone is used in the transmitted light region is 1. Is a value expressed as a ratio.

From the above, the value of the area ratio (transparent film forming area / transparent film pattern area area) of the area where the transparent film is formed in the transparent film pattern area is 0.3.
It may be preferable that it is in the range of 0.5 to 0.5, especially 0.35 to 0.45. Here, the transparent film formation area is the area where the transparent film is formed in the transparent film pattern region.

Further, the film thickness of the transparent film forming the transparent film pattern layer and the transparent film uniform layer is 1 when the colored layer is the colored layer only and is used in the transmitted light region. In this case, it can be said that the film thickness is preferably in the range of 0.5 to 3.0, particularly 1.1 to 1.4, and particularly 1.25 to 1.35.

(Manufacturing Method) Since the manufacturing method of the color filter for the transflective liquid crystal display device in this embodiment is the same as that of the first embodiment, the description thereof is omitted here.

(Others) The semi-reflective semi-transmissive color filter of this embodiment may have a black matrix or another layer, such as a transparent electrode layer or a polarizing layer, if necessary. The positions and materials for forming these are the same as those of the conventional ones, and thus the description thereof is omitted here.

C. Transflective Transflective Liquid Crystal Display Device Next, the transflective liquid crystal display device of the present invention will be described. The present invention provides a transflective liquid crystal display device having the color filter for a transflective liquid crystal display device described above.

According to the present invention, by having the above-described color filter for the semi-transmissive-semi-reflective liquid crystal display device, it is possible to more approximate the color characteristics of the color image by the transmitted light display and the reflected light display.

A transflective liquid crystal display device according to the present invention is a transflective liquid crystal display device using the transflective color filter described above. An array substrate facing the color filter, the color filter and the array substrate,
A liquid crystal layer enclosed between the color filter and the array substrate, and a portion of the array substrate on which a reflective film made of an aluminum film, a silver film, or the like is disposed and a portion where the reflective film is not disposed. And is formed and each has a reflective region and a transmissive region, and is not particularly limited.

The present invention is not limited to the above embodiment. The above-described embodiment is an exemplification, has substantially the same configuration as the technical idea described in the scope of the claims of the present invention, and has any similar effect to the present invention. It is included in the technical scope of the invention.

[0081]

EXAMPLES The present invention will be described more specifically by showing Examples and Comparative Examples below.

Example 1 A glass substrate (soda glass, plate thickness 0.7 mm) was used as the transparent substrate, a photosensitive acrylic resin was used as the transparent layer material, and an acrylic negative-type phosphor and a resist mixed with a pigment were used as the colored layer. A transparent film-forming coating liquid prepared by dissolving a transparent film-forming resin having the above composition in a solvent was prepared on this substrate, and was uniformly applied by a spin coating method or the like. After the coating liquid was dried, a pattern in which holes were formed in a pattern on the transparent film was exposed and then developed to form a transparent film pattern layer.

Subsequently, a coating solution for forming a colored layer having the above composition was applied by spin coating, followed by drying, prebaking,
A colored layer was formed by repeating exposure, development, and post-baking for each color of red, blue, and green to obtain a color filter of the present invention.

A necessary functional layer such as a transparent electrode layer was formed on the above color filter to obtain a liquid crystal display device of the present invention.
When using this liquid crystal display device for transmitted light, red, green,
The CIE (1931) xy chromaticity values displaying blue and white are shown in Table 1 and FIG.

(Example 2) Using the same material and method as in Example 1, a pattern in which a transparent film was patterned in an island shape was formed as a transparent film pattern layer, and the same pattern as in Example 1 was formed on this pattern layer. A colored layer was formed using the materials and method to obtain the color filter of the present invention.

A necessary functional layer such as a transparent electrode layer was formed on the above color filter to obtain a liquid crystal display device of the present invention.
The values displaying red and green when this liquid crystal display device is used for transmitted light are shown in Table 1 and FIG.

Comparative Example 1 A reflective color filter was obtained by reducing the thickness of the colored layer of the transmissive color filter used in Example 1 to 1/2. In order to use the transmissive color filter as a reflective color filter so as to obtain the same chromaticity, light passes through the color filter twice, so that the reflective color filter is compared with the colored layer of the transmissive color filter. The thickness of the colored layer of the filter may be halved. A necessary functional layer such as a transparent electrode layer is formed on the color filter, a reflective film made of an aluminum film is arranged on the array substrate facing the color filter, and a functional film such as a polarizing plate is arranged on the array substrate. A liquid crystal display device was obtained. The chromaticity values when red, green, blue, and white are displayed on this liquid crystal display device are shown in Table 1 and FIG.

Comparative Example 2 Using the color filter for reflected light used in Comparative Example 1, as in Examples 1 and 2, necessary functional layers such as transparent electrode layers were formed on the color filter, A transmissive liquid crystal display device was obtained. The chromaticity values when red, green, blue, and white are displayed on this liquid crystal display device are shown in Table 1 and FIG.

[0089]

[Table 1] The chromaticity value of Comparative Example 1 is a chromaticity value when the color filter is used as a reflective display. The chromaticity value of Comparative Example 2 is a chromaticity value when the color filter of Comparative Example 1 is used as it is for transmissive display. There is a large difference in the chromaticity values between Comparative Examples 1 and 2, that is, in Comparative Example 1 in reflective display and transmissive display,
When the same color filter as shown in 2 is used, the chromaticity values are significantly different. From this, it can be said that when the color filter is used for the transmissive display, the color characteristics of the transmissive display and the reflective display are similar because the chromaticity values are similar to those of Comparative Example 1.

As shown in FIG. 11, in Example 1 of the present invention, the chromaticity values are similar to those of Comparative Example 1 in comparison with Comparative Example 2 in which the reflective color filter is used as it is for transmissive display. was gotten. In addition, in Example 2, the result was obtained that the red and green were more similar.

(Measurement method) A spectrophotometer (MCPD-2000, Otsuka Electronics Co., Ltd.) was used for chromaticity measurement. Here, a D65 light source was used for the chromaticity of the reflective display, and a white LED (LNJ010CSFRA Matsushita Electric Industrial Co., Ltd.) light source was used for the transmissive display. As for the reason for selecting the light source, in the case of reflection display, since daylight is mainly assumed as external light, chromaticity measurement is performed using a D65 light source which is a standard light source for daylight. In addition, as a backlight in the transmissive display of a liquid crystal display device used for portable applications,
Generally, a white LED is used. Therefore, a white LED light source was used for chromaticity measurement of transmissive display.

[0092]

According to the present invention, the transparent substrate has the transparent film pattern region in which the transparent film is formed in a pattern, so that the color characteristics of the reflected light region or the transmitted light region are adjusted. It becomes possible, and the area for reflected light,
It is possible to provide a color filter for a semi-transmissive-semi-reflective liquid crystal display device having the same color characteristics as the transmitted light region, that is, the color reproduction region.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a transflective color filter of the present invention.

FIG. 2 is a diagram showing another example of the semi-transmissive-semi-reflective color filter of the present invention.

FIG. 3 is a diagram showing an example of a transparent film pattern in a transparent film pattern region of the present invention.

FIG. 4 is a diagram showing another example of the pattern of the transparent film in the transparent film pattern region of the present invention.

FIG. 5 is a diagram showing another example of the pattern of the transparent film in the transparent film pattern region of the present invention.

FIG. 6 is a diagram showing another example of the pattern of the transparent film in the transparent film pattern region of the present invention.

FIG. 7 is a diagram showing an example of a light transmission path of a semi-transmissive / semi-reflective color filter of the present invention.

FIG. 8 is a diagram showing an example of a simulation for obtaining an optimum value of the transflective color filter of the present invention.

FIG. 9 is a diagram showing an example of a transparent film pattern in a transparent film pattern region of the present invention.

FIG. 10 is a diagram showing an area ratio of a transparent film pattern region in the whole of the present invention.

FIG. 11 is a diagram showing an example of an embodiment of a transflective color filter of the present invention.

FIG. 12 is a diagram showing an example of a conventional transflective color filter.

[Explanation of symbols]

1 ... Transflective color filter 2 ... Transparent substrate 3 ... Transparent film 4 ... Colored layer 5: Area for transmitted light 6 ... Area for reflected light 7 ... Transparent film pattern t ... Pattern spacing

Claims (11)

[Claims] 1. A transparent substrate, a transparent film pattern layer formed by patterning a transparent film on the transparent substrate, and a colored layer formed so as to cover the transparent film pattern layer. A color filter for a transflective liquid crystal display device, which has a transparent film pattern region. 2. The transparent film pattern area is used as a reflected light area, and the colored layer area having the transparent substrate and a colored layer formed on the transparent substrate is used as a transmitted light area. The color filter for a transflective liquid crystal display device according to claim 1. 3. The transparent film pattern area is used as an area for transmitted light, the transparent substrate, a transparent film uniform layer formed by uniformly forming a transparent film on the transparent substrate, and the transparent film uniform layer on the transparent film uniform layer. The color filter for a transflective liquid crystal display device according to claim 1, wherein a transparent film uniform region formed by laminating the formed colored layer is used as a region for reflected light. 4. The area ratio of the area where the transparent film is formed in the transparent film pattern area is in the range of (transparent film forming area / transparent film pattern area area) = 0.3 to 0.5. The color filter for a semi-transmissive semi-reflective liquid crystal display device according to claim 3. 5. The film thickness of the transparent film forming the transparent film pattern layer and the transparent film uniform layer is the film thickness of the colored layer when the colored layer is used only in the colored layer for the transmitted light region. The color filter for a semi-transmissive-semi-reflective liquid crystal display device according to claim 4, wherein the film thickness is within a range of 0.5 to 3.0 when set to 1. 6. The semi-transmissive semi-transparent layer according to claim 1, wherein the transparent film pattern layer has a pattern in which a transparent film is formed in an island shape. Color filters for reflective liquid crystal display devices. 7. The transparent film pattern layer according to claim 1, wherein the transparent film has a pattern in which holes are formed in a pattern in the transparent film. Color filters for transflective liquid crystal display devices. 8. The island-shaped portion or the hole portion of the transparent film pattern layer is formed in a circular shape, according to any one of claims 1 to 7. A color filter for a transflective liquid crystal display device according to item 1. 9. The film thickness of the transparent film pattern layer, or the transparent film forming the transparent film pattern layer and the transparent film uniform layer is 0.5 to 3.5 μm. 9. A color filter for a transflective liquid crystal display device according to any one of claims 1 to 8. 10. The wavelength of the transparent film is 380 nm to 780.
The color filter for a transflective liquid crystal display device according to any one of claims 1 to 9, wherein the spectral transmittance in nm is 85% or more. 11. A transflective liquid crystal display device comprising the color filter for a transflective liquid crystal display device according to claim 1. Description: