JP2009008714A - Color filter for semitransmissive liquid crystal display device and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a color filter for a semitransmissive liquid crystal display device, causing no film thickness variation between a colored layer in a reflection part region and a colored layer in a transmission part region even with a larger film thickens in a light scattering layer, and a method for manufacturing the same. <P>SOLUTION: The color filter 100 for a semitransmissive liquid crystal display device is manufactured by forming on a transparent substrate 11 a black matrix 21, a red pixel 51R consisting of a transmission part red layer 51Rt and a reflection part red layer 51Rr, a pixel 52G consisting of a transmission part green layer 52Gt and a reflection part green layer 52Gr, a blue pixel 53B consisting of a transmission part blue layer 53Bt and a reflection part blue layer 53Br, a light scattering layer 31 on the reflection part red layer 51Rr, the reflection part green layer 52Gr and the reflection part blue layer 53Br, and a step adjustment layer 41 on the transmission part red layer 51Rt, the transmission part green layer 52Gt and the transmission part blue layer 53Bt, respectively. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a color filter for a transflective liquid crystal display device, and more particularly to a color filter for a transmissive liquid crystal display device having a light scattering layer and a step adjustment layer and a method for manufacturing the same.

Since the liquid crystal display device is not a self-luminous display device, the display requires light from other sources. For example, a backlight is provided behind the liquid crystal panel, and display is performed using light from the rear.
Such a liquid crystal display device is called a transmissive liquid crystal display device, and is generally used indoors.
On the other hand, there is a reflection type liquid crystal display device in which a reflection layer is provided at the rear of the liquid crystal panel, and the display is performed by external light from the surroundings. This is mainly used in very bright environments such as outdoors.

Recently, a transflective liquid crystal display device in which both functions of a transmissive liquid crystal display device and a reflective liquid crystal display device are incorporated into one liquid crystal display device has been developed.
This transflective liquid crystal display device can be used in a very bright environment such as outdoors or in a dark environment such as indoors, and is expected as a liquid crystal display device used in mobile devices. Device.

The color filter used in the transflective liquid crystal display device has a colored pixel composed of a reflective portion colored layer and a transmissive portion colored layer, and light for scattering light reflected from the reflector on the reflective portion colored layer. A scattering layer is needed.
This light scattering layer includes a method in which a scattering film is attached to the outside of the liquid crystal panel and a method in which the light scattering layer is provided on the colored layer of the reflective portion of the color filter in the liquid crystal panel.

The light scattering layer is obtained by dispersing particles (fillers) having different refractive indexes in a resin, and has a function of scattering reflected light due to a difference in refractive index between the particles (fillers) and the resin.
The method of providing a light scattering layer on the colored portion of the reflective portion of the colored pixel is a transflective type compared to the method of attaching a scattering film to the outside of the liquid crystal panel by scattering the reflected light at a position close to the reflector. There is an effect of improving the contrast of the reflective display portion of the liquid crystal display device.

As an example of a color filter for a transflective liquid crystal display device, a color filter for a transflective liquid crystal display device as shown in FIG. 5 has been proposed. (For example, refer to Patent Document 1).
In the transflective liquid crystal display device color filter 300, a black matrix 22, a light scattering layer 32, a planarization layer 43, a red pixel 61 R, a green pixel 62 G, and a blue pixel 63 B are formed on a transparent substrate 11. The scattering layer 32 is formed below the reflecting portion red layer 61Rr, the reflecting portion green layer 62Gr, and the reflecting portion blue layer 63Br of the colored pixels (red pixel 61R, green pixel 62G, blue pixel 63B).

  A method for manufacturing the color filter 300 for the transflective liquid crystal display device will be described.

  First, a black photosensitive resin solution is applied on a transparent substrate 11 made of a glass substrate or the like to form a photosensitive layer, and a series of patterning processes such as pattern exposure and development are performed to form a black matrix 22 (FIG. 6). (See (a)).

Next, a photosensitive resin solution in which a filler such as silica is dispersed in a photosensitive resin such as epoxy resin or acrylic resin is applied to a coating means such as a spinner to form a photosensitive resin layer, and pattern exposure and development A light scattering layer 32 is formed on a portion of the transparent substrate 11 corresponding to the reflective portion colored layer region (see FIG. 6B).

Next, in order to fill the level difference generated between the transparent substrate 11 and the light scattering layer 32, a transparent resin solution is applied to form a planarization layer 43 (see FIG. 6C).
The thickness of the flattening layer 43 is set so as to be a panel gap value between the reflective portion colored layer and the transmissive portion colored layer when the panel is formed.

  Next, a red resist in which a red pigment is dispersed in a photosensitive resin is applied on the transparent substrate 11 on which the black matrix 22, the light scattering layer 32, and the planarizing layer 43 are formed, and pre-dried to form a red photosensitive layer. Then, a series of patterning processes such as pattern exposure and development are performed through a photomask, and the reflection portion red layer 61Rr is formed on the light scattering layer 32 in the reflection portion region, and the transmission portion red is formed on the planarizing layer 43 in the transmission portion region. Red pixels 61R each having a layer 61Rt are formed (see FIG. 6D).

  Next, a green resist in which a green pigment is dispersed in a photosensitive resin is applied on the transparent substrate 11 on which the black matrix 22, the light scattering layer 32, the planarization layer 43, and the red pixel 61R are formed, and is pre-dried to obtain a green color. A photosensitive layer is formed, and a series of patterning processes such as pattern exposure and development are performed through a photomask, and the reflective green layer 62Gr is formed on the light scattering layer 32 in the reflective region and the planarizing layer 43 in the transmissive region. A green pixel 62G having a transmissive portion green layer 62Gt formed thereon is formed (see FIG. 7E).

  Next, a blue resist in which a blue pigment is dispersed in a photosensitive resin is applied on the transparent substrate 11 on which the black matrix 22, the light scattering layer 32, the planarization layer 43, the red pixel 61R, and the green pixel 62G are formed, and preliminarily dried. Then, a blue photosensitive layer is formed, and a series of patterning processes such as pattern exposure and development are performed through a photomask, and the reflection portion blue layer 63Br is formed on the light scattering layer 32 in the reflection portion region and the transmission portion region is flattened. A blue pixel 63B having a transmissive portion blue layer 63Bt formed thereon is formed on the conversion layer 43, and the black matrix 22, the light scattering layer 32, the planarization layer 43, the red pixel 61R, the green pixel 62G and the red color are formed on the transparent substrate 11. A color filter 300 for a transflective liquid crystal display device in which the pixels 61R are formed is obtained (see FIG. 7F).

In general, in a transflective liquid crystal display device, a gap difference between a transmissive portion and a reflective portion is set to be about 2 μm. Therefore, in the color filter 300 for a transflective liquid crystal display device, a reflective portion colored pixel surface and a transmissive portion are arranged. The film thickness difference on the colored pixel surface should be about 2 μm.
In the color filter 300 for a transflective liquid crystal display device, the light scattering layer 32 is formed first, and the planarization layer 43, the red pixel 61R, the green pixel 62G, and the blue pixel 63B are sequentially formed. In order to secure a film thickness difference of about 2 μm between the surface and the transmissive portion colored pixel surface, the film thickness difference between the light scattering layer 32 and the flattening layer 43 must be secured about 2 μm at the time of forming the flattening layer 43. I must.

  If a colored pixel is to be formed in a state in which a difference in film thickness between the light scattering layer 32 and the flattening layer 43 is assured by about 2 μm, a colored resist is applied to form a colored photosensitive layer. There is a problem that the film thickness varies between the transparent layer and the colored layer in the transmissive part region, and the spectral transmittance characteristics of the reflective part colored layer and the transmissive part colored layer vary.

In addition, since the above-described light scattering layer cannot be increased in thickness, there is a problem that when the panel is formed, the color changes depending on the viewing angle.
JP 2003-156618 A

  The present invention has been devised in view of the above problems, and even when the thickness of the light scattering layer is increased, there is no variation in film thickness between the colored layer in the reflective region and the colored layer in the transmissive region. It is an object to provide a color filter for a transflective liquid crystal display device and a manufacturing method thereof.

In order to achieve the above object in the present invention, first, in claim 1, on a transparent substrate, a plurality of colored pixels comprising at least a black matrix, a transmissive portion colored layer and a reflective portion colored layer, and light scattering In a color filter for a transflective liquid crystal display device having a layer,
The light scattering layer is provided on the reflective portion colored layer, and a film is formed on the transparent portion colored layer in order to adjust a film thickness difference generated between the transparent portion colored layer and the light scattering layer. A color filter for a transflective liquid crystal display device, characterized in that a thickness difference adjusting layer is provided.

  The color for a transflective liquid crystal display device according to claim 1, wherein the thickness of the light scattering layer is set in a range of 2.0 to 5.0 μm. This is a filter.

Further, in claim 3, the light scattering layer is formed by coating a particle (filler) dispersion solution in which particles (fillers) having different refractive indexes are dispersed in a resin,
3. The color filter for a transflective liquid crystal display device according to claim 1, wherein the particle (filler) having a particle diameter of 2.0 to 4.0 [mu] m is used.

In claim 4, at least,
(A) forming a black matrix on a transparent substrate;
(B) forming a plurality of colored pixels including a transmissive portion colored layer and a reflective portion colored layer between black matrices;
(C) forming a light scattering layer on the reflective portion colored layer;
(D) forming a thickness difference adjusting layer on the transmissive part colored layer;
A method for producing a color filter for a transflective liquid crystal display device.

The color filter for a transflective liquid crystal display device of the present invention first forms a plurality of colored pixels composed of a transmissive portion colored layer and a reflective portion colored layer, forms a light scattering layer on the reflective portion colored layer, Since a step adjustment layer is provided to fill the film thickness difference between the scattering layer and the transmissive part colored layer, the film thickness of the light scattering layer can be set thick, and the color change caused by the viewing angle after making the panel Can be prevented.
In addition, since a plurality of colored pixels including a transmissive portion colored layer and a reflective portion colored layer are first formed, variations in film thickness between the transmissive portion colored layer and the reflective portion colored layer can be suppressed, and the display quality is improved. A transmissive liquid crystal display device can be obtained.

Hereinafter, embodiments of the present invention will be described.
FIG. 1A is a schematic configuration diagram showing an embodiment of a color filter for a transflective liquid crystal display device of the present invention.
FIG. 1B is a schematic configuration diagram showing another embodiment of the color filter for a transflective liquid crystal display device of the present invention.
The color filter 100 for a transflective liquid crystal display device of the present invention includes a black matrix 21, a red pixel 51R composed of a transmissive portion red layer 51Rt and a reflective portion red layer 51Rr, and a transmissive portion green layer 52Gt on a transparent substrate 11. And a green pixel 52G composed of a reflective portion green layer 52Gr, a blue pixel 53B composed of a transmissive portion blue layer 53Bt and a reflective blue layer 53Br, a reflective red layer 51Rr, a reflective green layer 52Gr and a reflective blue layer 53Br. On the light scattering layer 31, the transmissive portion red layer 51Rt, the transmissive portion green layer 52Gt, and the transmissive portion blue layer 53Bt, respectively, a step adjustment layer 41, a transparent electrode (not shown in particular), and a spacer (especially in FIG. (Not shown).

  The color filter 200 for a transflective liquid crystal display device of the present invention includes a black matrix 21, a red pixel 51 </ b> R composed of a transmissive portion red layer 51 </ b> Rt and a reflective portion red layer 51 </ b> Rr, and a transmissive portion green layer 52 </ b> Gt on a transparent substrate 11. And a green pixel 52G composed of a reflective portion green layer 52Gr, a blue pixel 53B composed of a transmissive portion blue layer 53Bt and a reflective blue layer 53Br, a reflective red layer 51Rr, a reflective green layer 52Gr and a reflective blue layer 53Br. On the light scattering layer 31, the transmissive part red layer 51Rt, the transmissive part green layer 52Gt, and the transmissive part blue layer 53Bt, respectively, a step adjustment layer 42, a transparent electrode (not shown in particular) and a spacer (especially in FIG. (Not shown).

  In the color filter for a transflective liquid crystal display device of the present invention, after the black matrix 21 is formed, a red pixel 51R composed of a transmissive portion red layer 51Rt and a reflective portion red layer 51Rr, a transmissive portion green layer 52Gt and a reflective portion green. The green pixel 52G composed of the layer 52Gr, the blue pixel 53B composed of the transmissive portion blue layer 53Bt and the reflective portion blue layer 53Br, and the light scattering layer 31 and the step adjustment layer 41 are formed. Of the thickness of the light-transmitting portion coloring layer and the reflecting portion coloring layer, the thickness range of the light-scattering layer 31 can be set wide, and the thickness difference caused by providing the light-scattering layer 31 is a step. Since the adjustment is performed by the adjustment layers 41 and 42, the difference in film thickness between the step adjustment layer on the transmissive portion colored layer and the light scattering layer on the reflective portion colored layer can be controlled with high accuracy.

  In the invention according to claim 2, by setting the film thickness of the light scattering layer 31 in the range of 2.0 to 5.0 μm, the color filter for the transflective liquid crystal display device of the present invention is used to form a panel. At this time, the phenomenon that the color changes depending on the viewing angle is prevented.

  In the invention according to claim 3, in order to set the film thickness of the light scattering layer 31 in the range of 2.0 to 5.0 μm, particles (filler) having a particle diameter of 2.0 to 4.0 μm are used. (Filler) A dispersion resin solution is prepared.

A method for manufacturing a color filter for a transflective liquid crystal display device according to a fourth aspect of the present invention will be described.
2 (a) to 2 (d) and FIGS. 3 (e) to 3 (f) are schematic cross-sectional views showing an embodiment of a method for manufacturing the color filter 100 for a transflective liquid crystal display device of the present invention.
First, a black photosensitive resin in which a black pigment such as carbon black is dispersed in an acrylic photosensitive resin is applied on a transparent substrate 11 made of a glass substrate or the like with a spinner or the like, and pre-dried to form a black photosensitive resin layer. The black matrix 21 is formed by performing patterning processes such as pattern exposure and development (see FIG. 2A).
Here, as the transparent substrate 11, a glass substrate such as low expansion glass, non-alkali glass, or quartz glass, a plastic film, or the like can be used.

Next, a red photosensitive resin solution in which a red pigment is dispersed in an acrylic photosensitive resin is applied onto the transparent substrate 11 on which the black matrix 21 is formed using a spinner or the like, and pre-dried to form a red photosensitive resin layer. Then, a series of patterning processes such as pattern exposure and development are performed using a predetermined exposure mask to form a red pixel 51R composed of a transmissive portion red layer 51Rt and a reflective portion red layer 51Rr (FIG. 2B). reference).
Here, the reflecting portion red layer 51Rr is provided with a through hole of a predetermined size for satisfying a desired color characteristic with the twice transmitted light of the incident light and the reflected light.

Next, a green photosensitive resin solution in which a green pigment is dispersed in an acrylic photosensitive resin is applied onto the transparent substrate 11 on which the black matrix 21 and the red pixel 51R are formed using a spinner or the like, and preliminarily dried to obtain a green photosensitive resin. Forming a green resin layer and performing a series of patterning processes such as pattern exposure and development using a predetermined exposure mask to form a green pixel 52G composed of a transmissive green layer 52Gt and a reflective green layer 52Gr (FIG. 2 (c)).
Here, the reflecting portion green layer 52Gr is provided with a through hole of a predetermined size for satisfying a desired color characteristic with the twice transmitted light of the incident light and the reflected light.

Next, a blue photosensitive resin solution in which a blue pigment is dispersed in an acrylic photosensitive resin is applied onto the transparent substrate 11 on which the black matrix 21, the red pixel 51R, and the green pixel 52G are formed using a spinner or the like. A blue photosensitive resin layer is formed by drying, and a series of patterning processes such as pattern exposure and development are performed using a predetermined exposure mask, and a blue pixel 53B composed of a transmissive portion blue layer 53Bt and a reflective portion blue layer 53Br. (See FIG. 2D).
Here, the reflecting portion blue layer 53Br is provided with a through hole of a predetermined size for satisfying a desired color characteristic with the twice transmitted light of the incident light and the reflected light.

Next, a photosensitive resin solution in which particles (fillers) are dispersed in a photosensitive transparent resin solution is prepared, and the transparent substrate 11 on which the black matrix 21, the red pixel 51R, the green pixel 52G, and the blue pixel 53B are formed. It is coated with a spinner or the like, preliminarily dried to form a particle (filler) photosensitive layer, and subjected to a series of patterning processes such as pattern exposure and development using a predetermined exposure mask, so that the reflective portion of each colored pixel A light scattering layer 31 having a predetermined thickness is formed on the red layer 51Rr, the reflective green layer 52Gr, and the reflective blue layer 53Br (see FIG. 3E).
Here, the thickness of the light scattering layer 31 is 2 in order to prevent the phenomenon that the color changes depending on the viewing angle when the panel is formed using the color filter for a transflective liquid crystal display device of the present invention. It is preferable to set in the range of 0.0 to 5.0 μm.

Examples of the particles (filler) include fine particles made of an inorganic substance and fine particles made of an organic polymer. In particular, organic polymer fine particles are preferable from the viewpoint of being amorphous, but inorganic fine particles are not a problem as long as they are amorphous.
The particles (fillers) are preferably amorphous fine particles, and crystalline particles are considered to have optical anisotropy and are not preferable for light scattering.

  The particles (fillers) are, for example, inorganic fine particles, spherical amorphous fine particles such as silica or alumina oxide, and organic polymer fine particles, acrylic fine particles, styrene acrylic fine particles and their cross-linked bodies, melamine- Formalin condensate, (polytetrafluoroethylene), PFA (perfluoroalkoxy resin), FEP (tetrafluoroethylene-hexafluoropropylene copolymer), PVDF (polyfluorovinylidene), ETFE (ethylene-tetrafluoroethylene copolymer) And fluorine-containing polymers such as silicon resin fine particles. Among these, crosslinked acrylic resin fine particles having a refractive index of less than 1.5, and silica particles or silicon resin fine particles having a refractive index of 1.42 to 1.45 are particularly preferable.

  As the particle diameter of the particles (filler), in order to realize the light scattering layer 31 having a thickness of 2.0 to 5.0 μm, it is preferable to use particles (filler) having a particle diameter of 2.0 to 4.0 μm. preferable.

The transparent resin for dispersing the particles (filler) is preferably one having high visible light transmittance and sufficient resistance to heat treatment and chemical treatment during the manufacturing process of the liquid crystal display device. An acrylic resin or an epoxy resin can be used. It is also possible to use a thermosetting resin or an ultraviolet curable resin.

  Next, the photosensitive resin solution is applied on the transparent substrate 11 on which the black matrix 21, the red pixel 31R, the green pixel 32G, the blue pixel 53B, and the light scattering layer 31 are formed using a spinner or the like, and a photosensitive layer having a predetermined thickness. And a series of patterning processes such as pattern exposure and development using a predetermined exposure mask to form a predetermined film on the transmissive portion red layer 51Rt, transmissive portion green layer 52Gt, and transmissive portion blue layer 53Bt of each colored pixel. A thick step adjustment layer 41 is formed (see FIG. 3F).

Here, as shown in FIG. 4, the film thickness of the step adjustment layer 41 is T ₁ , the film thickness of the light scattering layer 31 is T ₂ , the film thickness T _{1 of the} light scattering layer 31 is T _1. and when the thickness difference between the thickness T ₂ of the height difference adjusting layer 41 was set to T _3, is set to a film thickness such that the thickness difference T ₃ approximately 2 [mu] m.
For example, if the thickness T ₁ of the light scattering layer 31 is 4 μm, the step adjustment layer 41 having a thickness of 4-2 = 2 μm may be formed.
The film thickness difference T ₃ between the film thickness T ₁ of the light scattering layer 31 and the film thickness T ₂ of the step adjustment layer 41 indicates an optimum gap difference when the liquid crystal panel is formed, and is generally 2 μm. It is said that the optimum gap difference of 2 μm may vary depending on the liquid crystal panel.

  Finally, a transparent electrode and a spacer (in particular, not shown) are formed by a known method to obtain the color filter 100 for a transflective liquid crystal display device of the present invention.

A method for manufacturing the color filter 200 for a transflective liquid crystal display device of the present invention will be described.
The steps up to forming the black matrix 21, red pixel 31R, green pixel 32G, blue pixel 53B, and light scattering layer 31 on the transparent substrate 11 are the same as the method for manufacturing the color filter 100 for the transflective liquid crystal display device, and therefore omitted. To do.
First, on the transparent substrate 11 on which the black matrix 21, the red pixel 31R, the green pixel 32G, the blue pixel 53B, and the light scattering layer 31 are formed, a resin solution made of a transparent resin is applied using a spinner or the like to form a coating film. Then, the step adjustment layer 42 is formed by preliminary drying and curing (see FIG. 1B).
As described in the color filter 100 for the transflective liquid crystal display device, the film thickness difference between the light scattering layer 31 and the film thickness of the step adjustment layer 42 is approximately 2 μm. Set to be.

The method of forming the step adjustment layer 42 is that a wide range of resins can be selected as the transparent resin used for the resin solution because the coating film is formed by a coating method generally called an overcoat.
The transparent resin used for the resin solution is preferably one having a high visible light transmittance and sufficient resistance to heat treatment and chemical treatment during the manufacturing process of the liquid crystal display device. Modified acrylic resin, fluorene resin, and polyimide resin can be used, and fluorine-modified acrylic resin and silicon-modified acrylic resin can be used as resins having a low refractive index. In addition, acrylic resin, epoxy resin, polyester resin, urethane resin, silicon resin, etc. can be used.

  Finally, a transparent electrode and a spacer (in particular, not shown) are formed by a known method to obtain the color filter 200 for a transflective liquid crystal display device of the present invention (see FIG. 1B).

The color filter for a transflective liquid crystal display device of the present invention first forms a plurality of colored pixels composed of a transmissive portion colored layer and a reflective portion colored layer, forms a light scattering layer on the reflective portion colored layer, Since a step adjustment layer is provided to fill the film thickness difference between the scattering layer and the transmissive part colored layer, the film thickness of the light scattering layer can be set thick, and the color change caused by the viewing angle after making the panel Can be prevented.
In addition, since a plurality of colored pixels including a transmissive portion colored layer and a reflective portion colored layer are first formed, variations in film thickness between the transmissive portion colored layer and the reflective portion colored layer can be suppressed, and the display quality is improved. A transmissive liquid crystal display device can be obtained.

  Hereinafter, the present invention will be described in detail by way of examples.

  A black photosensitive resin solution in which carbon black was dispersed in an acrylic photosensitive resin was applied onto a transparent substrate 11 made of a glass substrate by a spinner or the like, and preliminarily dried to form a black photosensitive resin layer. Further, patterning processing such as pattern exposure and development was performed using a predetermined exposure mask to form a black matrix 21 (see FIG. 2A).

  Next, a red photosensitive resin solution in which a red pigment (for example, dianthraquinone pigment) is dispersed in an acrylic photosensitive resin is applied onto the transparent substrate 11 on which the black matrix 21 is formed using a spinner or the like, and red A photosensitive resin layer was formed. Further, patterning processing such as pattern exposure and development is performed using a predetermined exposure mask to form a red pixel 51R having a thickness of 1.5 μm composed of a transmissive portion red layer 51Rt and a reflective portion red layer 51Rr with a 25 μm through hole. (See FIG. 2 (b)).

  Next, a green photosensitive resin solution in which a green pigment (for example, phthalocyanine green pigment) is dispersed in an acrylic photosensitive resin is applied onto the transparent substrate 11 on which the black matrix 21 and the red pixel 51R are formed using a spinner or the like. And pre-dried to form a green photosensitive resin layer. Further, a series of patterning processes such as pattern exposure and development are performed using a predetermined exposure mask, and a green pixel 52G having a thickness of 1.5 μm composed of a transmission part green layer 52Gt and a reflection part green layer 52Gr with a 25 μm through hole. (See FIG. 2C).

  Next, a blue photosensitive resin solution in which a blue pigment (for example, phthalocyanine blue pigment) is dispersed in an acrylic photosensitive resin is used with a spinner or the like to form a black matrix 21, a red pixel 51R, and a green pixel 52G. It is coated on the substrate 11 and preliminarily dried to form a blue photosensitive resin layer, and a series of patterning processes such as pattern exposure and development are performed using a predetermined exposure mask, so that the transmissive portion blue layer 53Bt and the 25 μm through hole are formed. A blue pixel 53 </ b> B having a thickness of 1.5 μm formed of the attached reflective portion blue layer 53 </ b> Br was formed (see FIG. 2D).

  Next, a photosensitive resin solution is prepared by dispersing particles (filler) made of silicon resin having a particle diameter of 2.5 μm in an acrylic photosensitive resin, and the black matrix 21, red pixel 51R, green pixel 52G, and blue pixel are prepared. On the transparent substrate 11 on which 53B is formed, it is applied with a spinner or the like, preliminarily dried to form a particle (filler) photosensitive layer, and a series of patterning processes such as pattern exposure and development are performed using a predetermined exposure mask. Thus, the light scattering layer 31 having a thickness of 3.5 μm was formed on the reflecting portion red layer 51Rr, the reflecting portion green layer 52Gr, and the reflecting portion blue layer 53Br (see FIG. 3E).

  Next, an acrylic photosensitive resin solution is applied onto the transparent substrate 11 on which the black matrix 21, the red pixel 31R, the green pixel 32G, the blue pixel 53B, and the light scattering layer 31 are formed using a spinner or the like. And a series of patterning processes such as pattern exposure and development using a predetermined exposure mask, and 1.5 μm is formed on the transmissive portion red layer 51Rt, the transmissive portion green layer 52Gt, and the transmissive portion blue layer 53Bt. A thick step adjustment layer 41 was formed (see FIG. 3F).

  Next, an indium-tin oxide-based alloy target was sputtered to form a transparent electrode (not shown) made of indium tin oxide on the light scattering layer 31 and the step adjustment layer 41.

  Finally, an acrylic clear resist is applied with a spinner or the like, preliminarily dried to form a photosensitive layer, and subjected to a series of patterning processes such as pattern exposure and development using a predetermined exposure mask, and a predetermined position. A spacer (not shown in particular) was formed on the substrate to obtain a color filter 100 for a transflective liquid crystal display device of the present invention.

  In the same process as in Example 1, on the transparent substrate 11 made of a glass substrate, the black matrix 21, the transmissive portion red layer 51Rt, and the reflective portion red layer 51Rr with a 1.8 μm through hole is 1.5 μm thick. A green pixel 52G having a thickness of 1.5 μm composed of a red pixel 51R, a transmissive portion green layer 52Gt, and a reflective portion green layer 52Gr with a 1.8 μm through hole, and a transmissive portion blue layer 53Bt and a reflective portion with a 1.8 μm through hole. A blue pixel 53B having a thickness of 1.5 μm composed of a partial blue layer 53Br, and a light scattering layer 31 having a thickness of 3.5 μm formed on the reflective red layer 51Rr, the reflective green layer 52Gr, and the reflective blue layer 53Br, respectively. .

  Next, an acrylic resin solution is applied onto the transparent substrate 11 on which the black matrix 21, the red pixel 31R, the green pixel 32G, the blue pixel 53B, and the light scattering layer 31 are formed by using a spinner or the like, and preliminarily dried and heated. It hardened | cured and the 2 micrometer thickness level | step difference adjustment layer 42 was formed (refer FIG.1 (b)).

  Next, an indium-tin oxide-based alloy target was sputtered to form a transparent electrode (particularly not shown) made of indium tin oxide on the step adjustment layer 42.

  Finally, an acrylic clear resist is applied with a spinner or the like, preliminarily dried to form a photosensitive layer, and subjected to a series of patterning processes such as pattern exposure and development using a predetermined exposure mask, and a predetermined position. Spacers (not shown in particular) were formed on the substrate to obtain a color filter 200 for a transflective liquid crystal display device according to the present invention (see FIG. 1B).

(A) is typical sectional drawing which shows one Example of the color filter for transflective liquid crystal display devices of this invention. (B) is a schematic cross-sectional view showing another embodiment of the color filter for a transflective liquid crystal display device of the present invention. (A)-(d) is typical structure sectional drawing which shows a part of process of one Example of the manufacturing method of the color filter for transflective liquid crystal display devices of this invention. (E)-(f) is typical structure sectional drawing which shows a part of process of one Example of the manufacturing method of the color filter for transflective liquid crystal display devices of this invention. It is a partial expansion schematic block diagram for demonstrating the film thickness difference of a light-diffusion layer and a level | step difference adjustment layer. It is a schematic cross section showing an example of a conventional color filter for a transflective liquid crystal display device. (A)-(d) is typical structure sectional drawing which shows a part of process of the manufacturing method of the conventional color filter for transflective liquid crystal display devices. (E)-(f) is typical structure sectional drawing which shows a part of process of the manufacturing method of the conventional color filter for transflective liquid crystal display devices.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Transparent substrate 21, 22 ... Black matrix 31, 32 ... Light-diffusion layer 41, 42 ... Film thickness level | step difference adjustment layer 43 ... Planarization layer 51R, 61R ... Red pixel 51Rt, 61Rt ... Transmission part Red layer 51Rr, 61Rr: Reflection part red layer 52G, 62G ... Green pixel 52Gt, 62Gt ... Transmission part green layer 52Gr, 62Gr ... Reflection part green layer 53B, 63B ... Blue pixel 53Bt, 63Bt ... Transmission part blue layer 53Br, thickness of 63Br ...... reflection part blue layer 100, 200, 300 ...... transflective liquid crystal display device for color filter T ₁ ...... light diffusion layer thickness T ₂ ...... thickness height difference adjusting layer T ₃ …… Difference in film thickness between light diffusion layer thickness T ₁ and film thickness difference adjustment layer thickness T ₂

Claims (4)

In a color filter for a transflective liquid crystal display device having at least a black matrix, a plurality of colored pixels composed of a transmissive portion colored layer and a reflective portion colored layer, and a light scattering layer on a transparent substrate,
The light scattering layer is provided on the reflective portion colored layer, and a film is formed on the transparent portion colored layer in order to adjust a film thickness difference generated between the transparent portion colored layer and the light scattering layer. A color filter for a transflective liquid crystal display device, comprising a thickness difference adjusting layer.   2. The color filter for a transflective liquid crystal display device according to claim 1, wherein the thickness of the light scattering layer is set in a range of 2.0 to 5.0 μm. The light scattering layer is formed by coating a particle (filler) -dispersed resin solution in which particles (fillers) having different refractive indexes are dispersed in a resin,
3. The color filter for a transflective liquid crystal display device according to claim 1, wherein the particles (filler) having a particle size of 2.0 to 4.0 [mu] m are used. at least,
(A) forming a black matrix on a transparent substrate;
(B) forming a plurality of colored pixels including a transmissive portion colored layer and a reflective portion colored layer between black matrices;
(C) forming a light scattering layer on the reflective portion colored layer;
(D) forming a film thickness step adjusting layer on the transmissive portion colored layer;
A method for producing a color filter for a transflective liquid crystal display device.