JP2003043239A - Color filter substrate and method for manufacturing the same and liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color filter substrate capable of displaying both black- and-white and color images when it is used for a liquid crystal display device (in particular, for a transflective liquid crystal display device) both in reflective display and in transmissive display and improving display brightness and visibility in case of the transmissive display and the reflective display without cost increase and to provide a method for manufacturing the same and the liquid crystal display device. SOLUTION: A color filter substrate 10 is provided with a substrate 3, a reflection film 5 disposed on the substrate 3 and having transmission holes 6 practically making light pass therethrough and colored layers 4 disposed in regions corresponding to the transmission holes 6 on the substrate 3 but not disposed on the reflection film 5 except for the transmission holes 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color filter substrate, a method of manufacturing the same, and a liquid crystal display device. More specifically, when used in a liquid crystal display device (particularly, a semi-transmissive reflection type liquid crystal display device), both black-and-white display and color display are achieved in both reflective display and transmissive display. The present invention relates to a color filter substrate, which is capable of improving display brightness and visibility during transmissive display and reflective display without increasing cost, a manufacturing method thereof, and a liquid crystal display device.

[0002]

2. Description of the Related Art In recent years, liquid crystal display devices have been widely used in electronic devices such as mobile phones and portable personal computers. Further, a liquid crystal display device having a structure for performing color display using a color filter substrate is also widely used.

As a color filter substrate, conventionally, for example, R (red), G (green) and B (blue) colored layers are arranged in a predetermined arrangement on the surface of a base material formed of glass, plastic or the like. It is known to have a stripe array, a mosaic array, a delta array, etc. (see FIG. 12).

In addition, external light such as natural light and room illumination light is incident from the observation side, and the reflection type display for reflecting the light for display and light from the light source is incident from the side opposite to the observation side. There is known a so-called transflective liquid crystal display device capable of switching between a transmissive display for displaying and a display as required.

FIG. 13 is a sectional view schematically showing an example of a conventional transflective liquid crystal display device, which is a TFD (Thin Film Dio) which is a two-terminal type switching element.
1 schematically shows the configuration of an active matrix type transflective liquid crystal display device including de).

As shown in FIG. 13, this liquid crystal display device has a liquid crystal panel 5 in which a liquid crystal 53 is sandwiched between a first substrate 51 and a second substrate 52 which are opposed to each other with a sealing material 54 sandwiched therebetween.
And a backlight unit 6 arranged on the second substrate 52 side of the liquid crystal panel 5. Pixel electrodes 511 connected to the scanning lines via the TFD (none of which are shown) and arranged in a matrix on the first substrate 51.
And an alignment film 512 are formed. On the other hand, on the second substrate 52, a reflective film 521 that covers most of the second substrate 52.
And a flattening film 522 covering the surface of the second substrate 52 on which the reflective film 521 is formed, and a plurality of strip-shaped counter electrodes 523 and an alignment film 524 extending in a direction intersecting the scanning line. ing. Under such a configuration, the first substrate 51
Light incident from the side is reflected on the surface of the reflective film 521 on the second substrate 52 and emitted from the side of the first substrate 51, whereby reflective display is performed. further,
An opening 521a is formed in the reflective film 521 corresponding to each pixel electrode 511, and the light emitted from the backlight unit 6 and incident from the second substrate 52 side passes through the opening 521a. The light is emitted to the first substrate 51 side. Then, as a result, transmissive display is performed.

[0007]

However, in the conventional liquid crystal display device, in either of the reflective display and the transmissive display, only the monochrome display or the color display is performed. For example, in the case of a liquid crystal display device for a mobile phone, as in the case of standby (reflection display when the backlight is not lit) and operation (transmission display when the backlight is lit),
There is a problem in that the former case is displayed in black and white and the latter case is displayed in color, so that it is not possible to provide diversity. Also, in order to improve the brightness and visibility of the display, increase the power supply of the backlight,
Alternatively, the brightness and visibility of either the reflective display or the transmissive display must be sacrificed, and a liquid crystal display device having improved brightness and visibility without increasing cost has not yet been obtained. Is the current situation.

The present invention has been made in view of the above problems, and when used in a liquid crystal display device (particularly, a semi-transmissive reflection type liquid crystal display device), a reflection type display and a transmission type display are performed. In any case, both a monochrome display and a color display are possible, and a color filter that improves the display brightness and visibility during transmissive display and reflective display without increasing the cost. An object of the present invention is to provide a substrate, a method for manufacturing the substrate, and a liquid crystal display device.

[0009]

In order to achieve the above object, a color filter substrate of the present invention comprises a base material and a reflective film which is disposed on the base material and has a transmission hole through which light can substantially pass. And a colored layer which is arranged in a region corresponding to the transmission hole on the base material and which is not arranged on the reflection film except the transmission hole (hereinafter, referred to as “first Invention. "

When the color filter substrate of the first invention is used in a liquid crystal display device (particularly, a semi-transmissive reflection type liquid crystal display device), it is possible to perform monochrome display during reflection type display and color display during transmission type display. In addition, it is possible to improve the brightness and visibility of the display during the reflective display and the transmissive display without increasing the cost.

Further, the color filter substrate of the present invention comprises a base material, a reflective film disposed on the base material and having a transmission hole through which light can substantially pass, and the reflection film excluding the transmission hole. A colored layer that is disposed and is not disposed in a region corresponding to the transmission hole on the base material (hereinafter, may be referred to as “second invention”).

When the color filter substrate of the second invention is used in a liquid crystal display device (particularly, a semi-transmissive reflection type liquid crystal display device), it is possible to perform monochrome display during transmission type display and color display during reflection type display. In addition, the brightness and visibility of the display during the transmissive display and the reflective display can be improved without increasing the cost.

Further, the method for manufacturing a color filter substrate of the present invention comprises a step of forming a reflective film having a transmission hole on which light can substantially pass, and a step of forming the reflection film on the reflection film excluding the transmission hole. Includes a step of forming the colored layer in a region corresponding to the transmission hole on the base material without forming the colored layer (hereinafter, referred to as “third invention”).
Sometimes).

According to the method of manufacturing the color filter substrate of the third invention, the color filter substrate of the first invention can be manufactured efficiently and inexpensively.

Further, the method for manufacturing a color filter substrate of the present invention corresponds to the step of forming a reflection film having a transmission hole on which light can substantially pass through on the base material and the transmission hole on the base material. Without forming the colored layer in the area to
And a step of forming the colored layer on the reflective film excluding the transmission holes (hereinafter, referred to as "fourth invention").
Sometimes).

According to the method of manufacturing the color filter substrate of the fourth invention, the color filter substrate of the second invention can be efficiently manufactured at low cost.

Further, the method of manufacturing a color filter substrate of the present invention comprises a step of forming a reflective film having a transmission hole through which light can substantially pass through on a substrate, A step of forming the colored layer in a region corresponding to the transmission hole on the base material; and a step of removing the colored layer formed in a region corresponding to the transmission hole on the base material It is characterized in that (hereinafter, sometimes referred to as "fifth invention").

According to the method of manufacturing the color filter substrate of the fifth invention, the color filter substrate of the second invention can be manufactured efficiently and inexpensively as in the case of the fourth invention.

In addition, the liquid crystal display device of the present invention includes a pair of substrates, a reflective film disposed on one of the pair of substrates and having a transmission hole that substantially allows light to pass through, and the one substrate. And a colored layer which is disposed in a region corresponding to the transmission hole above and which is not disposed on the reflection film excluding the transmission hole (hereinafter, referred to as “sixth embodiment”.
Invention. "

The liquid crystal display device according to the sixth aspect of the invention is capable of color display during transmissive display and black-and-white display during reflective display, and displays at the time of transmissive display and reflective display without increasing costs. Brightness and visibility can be improved.

Further, the liquid crystal display device of the present invention is arranged on a pair of substrates and one of the pair of substrates,
A reflective film having a transmission hole that substantially allows light to pass through, and a colored layer that is disposed on the reflective film excluding the transmission hole and is not disposed in a region corresponding to the transmission hole on the one substrate. Is provided (hereinafter,
Sometimes referred to as the "seventh invention."

The liquid crystal display device according to the seventh aspect of the present invention can perform monochrome display during transmissive display and color display during reflective display, and display at the time of transmissive display and reflective display without increasing the cost. Brightness and visibility can be improved.

Further, the liquid crystal display device of the present invention is arranged on a pair of substrates and one of the pair of substrates,
A reflective film having a transmission hole that substantially allows light to pass therethrough, and a colored layer disposed on the other substrate of the pair of substrates, the colored layer being on the other substrate, the transmission hole. May be arranged in a region corresponding to the above, and may not be arranged in a region corresponding to the reflection film excluding the transmission hole (hereinafter, referred to as “eighth invention”). There is).

The liquid crystal display device according to the eighth invention is capable of color display during transmissive display and black-and-white display during reflective display, and displays during transmissive display and reflective display without increasing costs. Brightness and visibility can be improved.

Further, the liquid crystal display device of the present invention is arranged on a pair of substrates and one of the pair of substrates,
A reflective film having a transmission hole that substantially allows light to pass therethrough, and a colored layer disposed on the other substrate of the pair of substrates, the colored layer being on the other substrate, the transmission hole. May be arranged in a region corresponding to the reflection film except for the above, and may not be arranged in a region corresponding to the transmission hole (hereinafter, referred to as “the ninth invention”). There is).

The liquid crystal display device according to the ninth aspect of the invention can perform monochrome display during transmissive display and color display during reflective display, and display at the time of transmissive display and reflective display without increasing the cost. Brightness and visibility can be improved.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described below with reference to the drawings. This embodiment shows one aspect of the present invention, does not limit the present invention at all, and can be arbitrarily modified within the scope of the present invention.

A: Embodiment of First Invention FIG. 1 is a sectional view schematically showing an embodiment of a color filter substrate of the present invention (first invention). As shown in FIG. 1, the color filter substrate 10 of the present embodiment is
The base material 3, the reflective film 5 which is disposed on the base material 3 and has the transmission holes 6 through which light can substantially pass, and the transmission film which is disposed in a region corresponding to the transmission holes 6 on the base material 3 It is characterized by comprising a colored layer 4 which is not disposed on the reflective film 5 except for 6.

Here, as the base material 3, for example, a plate-like member having a light-transmitting property such as glass, quartz, or plastic can be used.

The colored layer 4 is usually R (red), G
The respective colored layers of (green) and B (blue) are formed in a colored layer forming region on the base material 3 in a predetermined arrangement, for example, a stripe arrangement, a mosaic arrangement, a delta arrangement or the like (FIG. 12). reference). Specifically, the colored layer 4 is made of a resin material of a predetermined color, for example, an R (red) photosensitive resist, a pigment resist, an acrylic resin, or the like, for example, using a spin coating method or an inkjet method, and a predetermined color. Is formed in the colored layer forming region on the base material 3 by using the patterning method (for example, photolithography method). in this case,
The plane size of each colored layer forming region is, for example, 30 μm.
It is formed to have a size of about m × 100 μm.

The reflection film 5 is a film for reflecting incident light from the base material 3 side, and is formed of, for example, a material having reflectivity (eg, aluminum or silver). The reflection film 5 is usually formed so as to cover the entire surface of the base material 3, and a transmission hole 6 is formed in a part thereof. As will be described later, at the time of transmissive display, incident light from the backlight unit passes through the transmissive hole 6 of the reflective film 5 and is emitted to the base material 3 side. Further, the surface of the reflective film 5 is formed with a large number of fine irregularities in order to enhance the diffusivity (diffusive reflectivity).

With this structure, when used in a liquid crystal display device (particularly, a semi-transmissive reflection type liquid crystal display device), it is possible to perform monochrome display during reflection type display and color display during transmission type display. It is possible to improve the brightness and visibility of the display during the reflective display and the transmissive display without increasing the cost. In this case, in the black-and-white display during the reflective display, since the coloring layer 4 or the like that reduces the reflection efficiency is not disposed at all on or above the surface of the reflective film 5, the transmittance is higher than that in the conventional case. The reflectance can be increased without lowering the brightness, and the brightness and visibility of the reflective display can be improved. On the other hand, when it is desired to increase the transmittance, it is possible to increase the transmittance without lowering the reflectance by decreasing the area occupied by the reflective film 5 (increasing the area of the transmission hole 6), and the brightness of the transmissive display is improved. And the visibility can be improved. In this way, by increasing or decreasing the area occupied by the reflective film 5 (decreasing the area of the transmission hole 6), the brightness and visibility of the transmissive display and the reflective display can be improved, and at the same time, either one of them can be improved. It is also possible to adjust the brightness and visibility of the transmissive display and the reflective display to desired sizes steplessly without sacrificing them.

B: Embodiment of Second Invention FIG. 2 is a sectional view schematically showing an embodiment of a color filter substrate of the present invention (second invention). As shown in FIG. 2, the color filter substrate 10 of the present embodiment is
The base material 3, the reflective film 5 that is disposed on the base material 3, and has the transmission holes 6 that allow light to substantially pass therethrough, and the transmission film on the base material 3 that is disposed on the reflection film 5 excluding the transmission holes 6 The colored layer 4 is not provided in the region corresponding to the hole 6.

Here, as the base material 3, the colored layer 4 and the reflective film 5, the same materials as those in the embodiment of the first invention can be used.

With this structure, when used in a liquid crystal display device (particularly, a semi-transmissive reflection type liquid crystal display device), monochrome display can be performed during transmissive display and color display can be performed during reflective display. It is possible to improve display brightness and visibility during transmissive display and reflective display without increasing costs. In this case, in the black-and-white display at the time of the transmissive display, since the coloring layer 4 or the like that reduces the reflection efficiency is not disposed on the area corresponding to the transmission hole 6 of the reflection film 5, the reflectance is reduced. The transmittance can be increased without lowering, and the brightness and visibility of the transmissive display can be improved. On the other hand, when it is desired to increase the reflectance, the area occupied by the reflection film 5 is increased (the area of the transmission hole 6 is decreased), so that the reflectance can be increased without lowering the transmittance as compared with the conventional case. The brightness and visibility of the reflective display can be improved. In this way, by increasing or decreasing the area occupied by the reflective film 5 (decreasing the area of the transmission hole 6), the brightness and visibility of the transmissive display and the reflective display can be improved, and at the same time, either one of them can be improved. It is also possible to adjust the brightness and visibility of the transmissive display and the reflective display to desired sizes steplessly without sacrificing them.

C: Embodiment of Third Invention FIG. 3 is a process chart schematically showing one embodiment of a method for manufacturing a color filter substrate of the present invention (third invention). As shown in FIG. 3, in the method for manufacturing a color filter substrate of the present embodiment, a step of forming a reflective film 5 having a transmission hole 6 through which light can substantially pass on the base material 3 (reflective film forming step). ) And a step of forming the colored layer 4 in a region corresponding to the transparent hole 6 on the base material 3 without forming the colored layer 4 on the reflective film 5 except the transparent hole 6 (colored layer forming step) It is characterized by including and.

The reflective film forming step will be specifically described in the sixth embodiment of the invention.

Regarding the colored layer forming step, as described in detail in the first embodiment of the present invention, the colored layer 4 is made of a resin material of a predetermined color, for example, an R (red) photosensitive resist. , A pigment resist, an acrylic resin, or the like is formed in the colored layer forming region on the base material 3 by using, for example, a spin coating method or an inkjet method, and using a predetermined patterning method (for example, photolithography method). In this case, it is preferable to use a patterning method (for example, a photolithography method) such that the patterning method is formed on the surface of the base material 3 in the region corresponding to the transmission hole 6 of the reflective film 5.

With this structure, the color filter substrate of the first invention can be manufactured efficiently and inexpensively.

D: Embodiment of Fourth Invention FIG. 4 is a process chart schematically showing one embodiment of a method for manufacturing a color filter substrate of the present invention (fourth invention). As shown in FIG. 4, in the method of manufacturing a color filter substrate according to the present embodiment, a step of forming a reflection film 5 having a transmission hole 6 through which light can substantially pass on the base material 3 (reflection film formation step). ) And the reflective film 5 excluding the transmission holes 6 without forming the colored layer 4 in the region corresponding to the transmission holes 6 on the base material 3.
And a step of forming the colored layer 4 thereon (colored layer forming step).

The reflective film forming step is the same as that in the third embodiment, and the colored layer forming step will be described in the sixth embodiment.

With this structure, the color filter substrate of the second invention can be manufactured efficiently and inexpensively.

E: Embodiment of Fifth Invention FIG. 5 is a process chart schematically showing one embodiment of a method for manufacturing a color filter substrate of the present invention (fifth invention). As shown in FIG. 5, in the method for manufacturing a color filter substrate according to the present embodiment, a step of forming a reflection film 5 having a transmission hole 6 through which light can substantially pass on the base material 3 (reflection film formation step). ), A step of forming the colored layer 4 on the reflective film 5 excluding the transmission holes 6 and a region corresponding to the transmission holes 6 on the base material 3 (colored layer forming step), and the transmission holes 6 on the base material 3). And a step of removing the colored layer 4 formed in the region corresponding to (colored layer removing step).

Here, as a method for removing the colored layer,
For example, a method using a general-purpose technique such as photolithography or etching can be used.

The reflective film forming step is the same as in the third embodiment of the invention, and the colored layer forming step will be described in the sixth embodiment of the invention.

With this structure, the color filter substrate of the second invention can be manufactured efficiently and inexpensively, as in the case of the embodiment of the fourth invention.

F: Sixth Embodiment of the Invention The first embodiment of the liquid crystal display device of the sixth invention is as follows.
A case where the invention is applied to a semi-transmissive reflection type liquid crystal display device of the active matrix system including the color filter substrate will be described. In addition, below, the case where a two-terminal switching element is used as a switching element is shown.

FIG. 6 is a sectional view schematically showing an embodiment of a liquid crystal display device of the present invention (sixth invention). As shown in FIG. 6, this liquid crystal display device has a liquid crystal 13 sandwiched between a pair of substrates (a first substrate 11 and a second substrate 12) facing each other with a sealing material (not shown) interposed therebetween. The panel 1 and the backlight unit 2 arranged on the second substrate 12 side of the liquid crystal panel 1 are configured to be included, and the second substrate (the first substrate 11 and the second substrate 12) of the pair of substrates (the first substrate 11 and the second substrate 12). A reflective film 121 having a transmission hole 121a through which light can substantially pass, and a transmission film 121a which is disposed in a region corresponding to the transmission hole 121a on the one substrate 12. It is characterized in that it is provided with a colored layer 123 which is not disposed on the reflective film 121 except for. In addition, in practice, a polarizing plate, a retardation plate, or the like for polarizing the incident light is attached to the outer surface (the side opposite to the liquid crystal 13) of the first substrate 11 and the second substrate 12, Since it is not directly related to the present invention, its description and illustration are omitted.

The backlight unit 2 includes a linear fluorescent tube for irradiating light, a reflector for reflecting the light emitted from the fluorescent tube and guiding it to the light guide plate 21 (neither is shown), and a fluorescent tube for emitting light. The light guide plate 21 that guides light to the entire surface of the liquid crystal panel 1, the diffusion plate 22 that uniformly diffuses the light guided to the light guide plate 21 with respect to the liquid crystal panel 1, and the light guide plate 21 is opposite to the liquid crystal panel 1. And a reflection plate 23 that reflects the light emitted to the side toward the liquid crystal panel 1 side. Here, the fluorescent tube is not always lit, but when used in an environment where there is almost no external light, it illuminates according to an instruction from the user or a detection signal from the sensor, and Transmissive display is performed.

The first substrate 11 of the liquid crystal panel 1 is a light-transmissive plate-shaped member such as glass, quartz, or plastic. A plurality of pixel electrodes 111 are arranged in a matrix on the inner surface (on the liquid crystal 13 side) of the first substrate 11. Each pixel electrode 111 is formed of, for example, ITO (In
It is formed of a transparent conductive material, such as aluminum (Din Tin Oxide).

FIG. 7 is an enlarged perspective view showing the surface of the first substrate 11 on which the pixel electrodes 111 and the like are formed. In addition,
In FIG. 7 and FIG. 6, the vertical relationship is reversed.

As shown in FIG. 7, the pixel electrode 111 has a T
It is connected via the FD 113 to a scanning line (formed in FIG. 6 that extends in the direction perpendicular to the paper) 114 for supplying a pixel voltage. In addition, each TFD 113 includes a first metal film 113 a that is a portion branched from the scanning line 114 and the first metal film 113 a.
An oxide film 113b which is an insulator formed on the surface of the metal film 113a by anodic oxidation, and a second metal film 113 formed of, for example, chromium on the upper surface of the oxide film 113b.
c is a two-terminal switching element having a non-linear current-voltage characteristic. And this TFD113
The second metal film 113c is connected to the pixel electrode 111.

In FIG. 6, the pixel electrode 111 and the TFD are
The surface of the first substrate 11 on which (not shown) and the like are formed is covered with an alignment film 112. This alignment film 112 is
It is an organic thin film made of polyimide or the like, and is subjected to rubbing treatment for defining the alignment direction of the liquid crystal 13 when no voltage is applied.

On the other hand, the second substrate 12 is formed by laminating a base material 12a such as a glass substrate and a resin layer 12b as required. On the inner surface of the second substrate 12 (that is, the surface of the resin layer), a reflective film 121 having a transmission hole (opening) 121a, a light shielding film (not shown), and a color filter (colored layer) 123. The overcoat layer 124, the counter electrode 125, and the alignment film 126 are formed in the above-mentioned arrangement relationship. That is, the color filter (coloring layer) 12
3 is laminated on the inner surface side of the second substrate 12 in a region corresponding to the transmission hole 121a of the reflection film 121, and is not formed on the reflection film 121 except the transmission hole 121a.

The reflective film 121 is a film made of a material having reflectivity (for example, aluminum or silver) for reflecting incident light from the first substrate 11 side.

FIG. 8 is a plan view schematically showing the shape of the reflection film 121. In FIG. 8, the reflective film 1
Pixel electrode 111 formed on the first substrate 11
The region opposite to is shown by a broken line. As shown in FIG. 8, the reflective film 121 is formed so as to cover the entire surface of the second substrate 12, but the first substrate 1 is included in the surface of the second substrate 12.
1 has a shape in which an opening (transmission hole) 121a is formed in a part of a region facing each pixel electrode 111 formed in 1. As will be described later, the incident light from the backlight unit 2 passes through the opening 121a of the reflective film 121 and is emitted to the first substrate 11 side to perform a transmissive display.

Here, of the inner surface of the second substrate 12 (more specifically, the surface of the resin layer 12b), the area covered by the reflective film 121 (hereinafter referred to as "reflective area") is
It is a rough surface on which many fine irregularities are formed. Therefore, the surface of the reflective film 121 is formed with irregularities that reflect the irregularities on the reflective region.

The light-shielding film (not shown) is a film formed in a grid pattern so as to be located in the gaps between the pixel electrodes 111 formed on the first substrate 11, and shields the gaps between the pixels. It is for. Color filter (coloring layer) 123
As described above, depending on the dye or pigment, R (red), G
It is a film formed of a resin material colored in either (green) or B (blue). The surface of the second substrate 12 on which the reflective film 121, the light shielding film (not shown) and the color filter 123 are formed is covered with an overcoat layer 124 made of acrylic resin or epoxy resin. This flattens the convex portion formed on the second substrate 12 by the reflective film 121, the light shielding film, and the color filter (coloring layer) 123, and at the same time, the color filter (coloring layer) 123.
The organic material is prevented from seeping out and deteriorating the liquid crystal.

Further, a plurality of counter electrodes 125 are formed on the surface of the overcoat layer 124. Each counter electrode 125 is a strip-shaped electrode formed to extend in a predetermined direction so as to face each of the plurality of pixel electrodes 111 in a row on the first substrate 11, and is made of a transparent conductive material, for example, It is made of ITO or the like. First substrate 11 and second
The liquid crystal 13 sandwiched between the substrate 12 and the substrate 12
When a voltage is applied between 1 and the counter electrode 125, the orientation direction changes. That is, each pixel electrode 1
A region where 11 and each counter electrode 125 face each other functions as a pixel.

The above-mentioned opening 121a is formed corresponding to the area where the pixel is formed. On the other hand, the surface of the overcoat layer 124 on which the counter electrodes 125 are formed is covered with an alignment film 126 similar to the alignment film 112.

With the structure described above, the following reflective type display and transmissive type display are performed.

First, in the case of the reflection type display, external light such as sunlight and indoor lighting enters from the first substrate 11 side and the first substrate 1
1, the pixel electrode 111, the alignment film 112, the liquid crystal 13, the alignment film 126, the counter electrode 125, the overcoat layer 124, the color filter 123, and the reflective film 121 in order, and reaches the reflective film 121. After the light is reflected on the surface, the above-mentioned path is followed in reverse and the light is emitted from the first substrate 11 side and is visually recognized by an observer. Here, as mentioned above,
The surface of the reflective film 121 has irregularities that reflect the irregularities formed in the reflective region of the second substrate 12. Therefore, the incident light from the first substrate 11 side is reflected by the reflective film 121.
Since the light is appropriately scattered by the irregularities of the first substrate 11 and then emitted from the first substrate 11 side, it is possible to avoid a situation in which the background is reflected in the image visually recognized by the observer and the light from the room illumination is reflected.

On the other hand, in the case of the transmissive display, the irradiation light from the backlight unit 2 is the second substrate 12 and the reflection film 121.
Opening 121a, color filter (coloring layer) 123,
Overcoat layer 124, counter electrode 125, alignment film 12
6, the liquid crystal 13, the alignment film 112, the pixel electrode 111, and the first substrate 11 are sequentially emitted to be visually recognized by an observer.

In the case of the reflection type display (black and white display), a color filter (coloring layer) 123 or the like that reduces the reflection efficiency is arranged on the surface of the reflection film 121 or above the surface. Therefore, the reflectance can be increased without lowering the transmittance as compared with the related art, and the brightness and visibility of the reflective display can be improved. On the other hand, when it is desired to increase the transmittance, it is possible to increase the transmittance without decreasing the reflectance by decreasing the area occupied by the reflective film 121 (increasing the area of the transmission hole (opening) 121a). The brightness and visibility of transmissive display (color display) can be improved. As described above, by increasing or decreasing the area occupied by the reflective film 121 (the area of the transmission hole 121a), the brightness and visibility of the transmissive display and the reflective display can be improved, and one of the sacrifices is involved. Alternatively, the brightness and the visibility of the transmissive display and the reflective display can be adjusted steplessly to desired sizes.

A method of manufacturing such a liquid crystal display device will be described below.

First, as shown in FIG. 9A, a resin material is applied and baked to cover one surface of a substrate 12a such as a glass substrate to form a resin layer 12b. Next, a photoresist 32 that covers the resin layer 12b is formed, and a large number of minute holes 32a are formed in a region corresponding to the reflection region (FIG. 9B).

Next, with the photoresist 32 having such a large number of holes 32a formed as a mask, the resin layer 12b is formed.
Isotropically etched. As a result, FIG.
As shown in (c), a large number of fine recesses are formed in the portion of the resin layer 12b corresponding to the holes 32a of the photoresist 32. On the other hand, the region where no hole is formed is not removed by etching, and thus remains flat. After the above etching, the photoresist 32 is removed (FIG. 9D).

Next, the resin layer 12b thus formed with a large number of recesses is heated to a temperature above the thermal deformation temperature of this resin material. By this heating, the resin layer 12b is softened, and the corner portions of the resin layer 12b are rounded by the action of its thermal deformability and surface tension. As a result, as shown in FIG. 9E, the second substrate 12 having the reflection area A which is a rough surface having smooth unevenness and the transmission area B which is a flat surface is obtained.

Subsequently, a film 33 of a reflective material such as aluminum is formed on the entire surface of the second substrate 12 on which the rough surface and the flat surface are selectively formed as described above by a sputtering method or the like. . Further, as shown in FIG. 9F, a photoresist 34 is formed on a region of the film 33 corresponding to the reflection region.

Next, the film 33 having the photoresist 34 formed thereon is etched to form the photoresist 3
The film 33 in the area not covered by 4 is removed. As a result, the area removed by the etching is used as the opening 1
The reflection film 121 to be 21a is formed.

Next, a thin film of chromium or the like is formed on the surface of the second substrate 12 on which the reflective film 121 is formed, and this thin film is patterned to form a light shielding film (not shown). Then, a resin film colored in any one of R, G, and B is formed on the surface of the second substrate 12 on which the reflective film 121 and the light shielding film (not shown) are formed, and etching or etching is performed. Photolithography is performed, and a color filter (coloring layer) 123 of this color is formed in the opening (transmission hole) 121.
It is formed in the region corresponding to a. For the other two colors,
The color filter 123 (colored layer) is formed by the same process (FIG. 9 (h)).

Next, a resin material such as acrylic resin is applied to the entire surface of the second substrate 12 on which these parts are formed, and then baked to form an overcoat layer 124. Further, a thin film of ITO is formed on the surface of the overcoat layer 124 thus formed by a sputtering method or the like, and the thin film is subjected to etching, photolithography or the like to form a plurality of strip-shaped counter electrodes 125. . Next, after an organic material such as polyimide is applied and baked on the surface of the overcoat layer 124 on which the counter electrodes 125 are formed to form an alignment film 126, the alignment film 126 is covered with a liquid crystal 13 to be used. Uniaxial orientation processing (for example, rubbing processing) according to the twist angle is performed (FIG. 9).
(I)).

On the other hand, the scanning line 11 is formed on the surface of the first substrate 11.
4, the TFD 113 and the pixel electrode 111 are formed. Each of these portions can be formed using various known methods.

Next, a sealant having a shape surrounding the edge of the second substrate 12 is printed on the second substrate 12 obtained as described above, and the second substrate 12 and the pixel electrode 111 are printed. The liquid crystal panel 1 is obtained by bonding the first substrate 11 on which the above are formed and the like through a sealant, and enclosing the liquid crystal 13 therein. After that, the backlight unit 2 is disposed on the second substrate 12 side of the liquid crystal panel 1, and the liquid crystal display device shown in FIG. 6 is completed.

Although one embodiment of the liquid crystal display device of the present invention has been described above, the above embodiment is merely an example, and various modifications can be made to the above embodiment without departing from the spirit of the present invention. It can be modified.
For example, the following may be considered as modifications.

<Modification 1> In each of the above embodiments, an active matrix type liquid crystal display device using a two-terminal switching element has been shown. However, the present invention is, for example, a TFT (Thin Film Transistor).
The present invention is also applicable to a liquid crystal display device using a three-terminal type switching element typified by r: thin film transistor) or a passive matrix liquid crystal display device. Also in the case of these liquid crystal display devices, as in the above embodiments,
A reflective film having a transmission hole (opening) and a color filter (coloring layer) are provided on the substrate opposite to the observation side of the pair of substrates holding the liquid crystal, and the color filter (coloring layer) is provided through the transmission hole ( It may be formed in a region corresponding to the opening). In each of the above embodiments, the first substrate 1 on the observation side
1, the pixel electrode 111 and the TFD 113 are provided,
The counter electrode 125 facing the pixel electrode 111 is provided on the second substrate 12 on the side opposite to the observation side. On the contrary, the counter electrode is provided on the first substrate 11 and the pixel electrode is provided on the second substrate 12. Alternatively, a configuration in which a switching element or the like is provided may be used. On the other hand, even when a three-terminal switching element such as a TFT is used, the substrate on the observation side may be the element substrate provided with the switching element, and the other substrate may be the opposite substrate having the opposite electrode. On the contrary, the substrate on the observation side may be the counter electrode and the substrate on the opposite side to the observation side may be the element substrate.

<Modification 2> In each of the above-described embodiments, the reflective film 121 and the counter electrode 125 are separately provided on the second substrate 12 side. However, the reflective film 121 and the counter electrode 125 also have the functions. You may make it form a reflective electrode.

G: Seventh Embodiment of the Invention A sixth embodiment of the liquid crystal display device of the seventh invention is as follows.
The liquid crystal display device of the present invention can be basically applied in the same manner. That is, instead of arranging the colored layer in the region corresponding to the transmission hole on the base material, the coloring layer can be arranged on the reflection film excluding the transmission hole.

H: Embodiment of the eighth invention In the embodiments of the liquid crystal display device of the sixth invention and the seventh invention, the coloring layers are respectively formed on one substrate side of the pair of substrates. In the case of the embodiment of the liquid crystal display device of the eighth invention, as shown in FIG. 10, the coloring layer 123 is provided on the other substrate 1 of the pair of substrates 11 and 12, as shown in FIG.
A similar configuration can be achieved by arranging the same in a region corresponding to the transmission hole 121a on the first structure and not in a region corresponding to the reflection film 121 except the transmission hole 121a.

I: Embodiment of Ninth Invention As in the case of the embodiment of the eighth invention, the embodiment of the liquid crystal display device of the ninth invention is as shown in FIG. The same configuration can be achieved by arranging 123 on the other substrate 11 in a region corresponding to the reflective film 121 excluding the transmission hole 121a and not arranging it in a region corresponding to the transmission hole 121a.

[0081]

As described above, according to the present invention,
When used in a liquid crystal display device (particularly, a transflective liquid crystal display device), both black and white display and color display are possible in both reflective display and transmissive display. It is possible to provide a color filter substrate, a method for manufacturing the same, and a liquid crystal display device, which have improved display brightness and visibility during transmissive display and reflective display without increasing costs.

[Brief description of drawings]

FIG. 1 is a sectional view schematically showing an embodiment of a color filter substrate of the present invention (first invention).

FIG. 2 is a sectional view schematically showing an embodiment of a color filter substrate of the present invention (second invention).

FIG. 3 is a process drawing schematically showing an embodiment of a method for manufacturing a color filter substrate of the present invention (third invention).

FIG. 4 is a process chart schematically showing an embodiment of a method for manufacturing a color filter substrate of the present invention (fourth invention).

FIG. 5 is a process chart schematically showing one embodiment of a method for manufacturing a color filter substrate of the present invention (fifth invention).

FIG. 6 is a sectional view schematically showing an embodiment of a liquid crystal display device of the present invention (sixth invention).

7 is a perspective view schematically showing a configuration near a pixel electrode on the first substrate of the liquid crystal display device shown in FIG.

8 is a plan view schematically showing the configuration of a reflective film of the liquid crystal display device shown in FIG.

FIG. 9 is a process chart schematically showing a manufacturing method of the liquid crystal display device shown in FIG.

FIG. 10 is a sectional view schematically showing an embodiment of a liquid crystal display device of the present invention (eighth invention).

FIG. 11 is a sectional view schematically showing an embodiment of a liquid crystal display device of the present invention (ninth invention).

FIG. 12: R in the color filter (coloring layer)
It is a top view showing an example of arrangement of picture elements of three colors (red), G (green), and B (blue).

FIG. 13 is a sectional view schematically showing an example of a conventional transflective liquid crystal display device.

[Explanation of symbols]

1 ... Liquid crystal panel 10 ... Color filter substrate 11 ... First substrate 111 ... Pixel electrode 112 ... Alignment film 113 ... TFD 114 ... Scan line 12 ... Second substrate 12a ... Base material 12b ... Resin layer 121 ... Reflective film 121a ... Opening (transmission hole) 123 ... Color filter (coloring layer) 124 ... Overcoat layer 125 ... Counter electrode 126 ... Alignment film 127 ... Reflective electrode 127a ... opening 13 ... Liquid crystal 2 ... Backlight unit 21 ... Light guide plate 22 ... Diffusion plate 23 ... Reflector 3 ... Base material 4 ... Colored layer (color filter) 5 ... Reflective film 6 ... Transmission hole (opening)

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G02F 1/1335 520 G02F 1/1335 520 G09F 9/30 349 G09F 9/30 349B 349D 9/35 9/35 F term (reference) 2H042 BA03 BA15 BA20 DA02 DA04 DA11 DA12 DA17 DA22 DB01 DC01 DE00 2H048 BA45 BB02 BB08 BB10 BB44 2H091 FA02Y FA14Y FA41Z FB02 FB08 FC10 GA01 GA03 GA13 LA12 LA15 LA16 5C094 AA19 CA04 DAA19 CA04 DAA19 CA04 DAA19 CA10 DA02 ED11

Claims (9)

[Claims] 1. A base material, a reflective film disposed on the base material and having a transmission hole that allows light to substantially pass therethrough, and a reflective film disposed on a region of the base material corresponding to the transmission hole. A color filter substrate comprising: a colored layer that is not disposed on the reflective film except the transmission holes. 2. A base material, a reflective film which is disposed on the base material and has a transmission hole through which light can substantially pass, and a reflective film which is disposed on the reflection film excluding the transmission hole and on the base material. 2. A color filter substrate comprising: a colored layer which is not disposed in a region corresponding to the transmission hole. 3. A step of forming a reflective film having a transmission hole through which light can substantially pass through on a base material, and the step of forming the colored layer on the reflection film excluding the transmission hole without forming the colored layer. And a step of forming the colored layer in a region corresponding to the transmission hole on the base material. 4. A step of forming a reflective film having a transmission hole that substantially allows light to pass through on a base material, and forming the colored layer in a region corresponding to the transmission hole on the base material. And a step of forming the colored layer on the reflective film excluding the transmission holes. 5. A step of forming a reflective film having a transmissive hole through which light can substantially pass through on a base material, and the transmissive hole on the reflective film excluding the transmissive hole and on the base material. A method of manufacturing a color filter substrate, comprising: a step of forming the colored layer in a region; and a step of removing the colored layer formed in a region corresponding to the transmission hole on the base material. . 6. A pair of substrates, a reflective film disposed on one of the pair of substrates and having a transmission hole that allows light to substantially pass therethrough, and the reflection film corresponding to the transmission hole on the one substrate. A liquid crystal display device, comprising: a colored layer which is disposed in the region where the colored film is disposed and which is not disposed on the reflective film except the transmission hole. 7. A pair of substrates, a reflective film that is disposed on one of the pair of substrates and has a transmission hole that allows light to substantially pass therethrough, and disposed on the reflection film excluding the transmission hole. And a colored layer which is not disposed in a region corresponding to the transmission hole on the one substrate. 8. A pair of substrates, a reflection film disposed on one of the pair of substrates and having a transmission hole through which light can substantially pass, and on the other substrate of the pair of substrates. And a colored layer disposed, wherein the colored layer is disposed in the region corresponding to the transmission hole on the other substrate, and in the region corresponding to the reflective film excluding the transmission hole. A liquid crystal display device characterized by not being arranged. 9. A pair of substrates, a reflective film which is disposed on one of the pair of substrates and has a transmission hole through which light can substantially pass, and on the other substrate of the pair of substrates. And a colored layer disposed, wherein the colored layer is disposed in a region corresponding to the reflective film excluding the transmission hole on the other substrate, and in a region corresponding to the transmission hole. A liquid crystal display device characterized by not being arranged.