JP2002214600A - Liquid crystal display device and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device wherein image blur due to parallax is reduced, bright and uniform reflection display quality can be obtained and manufacturing is easy. SOLUTION: A supporting layer 26 the surface of which is accurately formed in a desired rugged shape is provided on the inner surface of a back side substrate 23 of a liquid crystal cell 21 by a transfer method or a printing method. A scattering reflection layer 27 consisting of a reflection layer having a rugged surface following the rugged surface of the supporting layer 26 is provided on the supporting layer 26. That is, the scattering reflection layer 27 is provided with a reflection surface having the desired rugged shape uniformly formed thereon and has both reflection and scattering functions. As a result, the liquid crystal display device wherein image blur due to parallax is reduced and which has bright and uniform reflection display quality can be obtained and easily manufactured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device having a scattering reflection layer in a liquid crystal cell and a method of manufacturing the same, and more particularly, to a bright and uniform reflective display quality in which image blur due to parallax is reduced. The present invention relates to a liquid crystal display device which can be manufactured and is easy to manufacture, and a method for manufacturing the same.

[0002]

2. Description of the Related Art FIG. 11 is a partial sectional view of an example of a conventional reflection type liquid crystal display device. This liquid crystal display device includes a liquid crystal cell 1 of a simple matrix type. The liquid crystal cell 1 includes a display surface side substrate 2 and a back side substrate 3 made of a glass substrate, a film substrate, or the like. A signal electrode 4 and an alignment film 5 are provided on the inner surface of the display surface side substrate 2. A reflective layer 6 made of aluminum or the like, red, green, and blue color filter elements 7, a protective film 8, a scan electrode 9, and an alignment film 10 are provided on the inner surface of the rear substrate 3.

Then, the display surface side substrate 2 and the back side substrate 3 are bonded together via a substantially rectangular frame-shaped sealing material (not shown), and the alignment films 5, 2 of the two substrates 2, 3 inside the sealing material. A liquid crystal 11 is sealed between the 10. A retardation plate 12 is attached to the outer surface of the display surface side substrate 2 via an adhesive layer (not shown), and a polarizing plate 13 is attached to the outer surface thereof via an adhesive layer (not shown). A scattering plate 14 is attached to the outer surface of the scattering plate 14 via an adhesive layer (not shown).

In this liquid crystal display device, the scattering plate 1
The external light incident from the outer surface side of the light-transmitting plate 4 is
3, the liquid crystal 11, the color filter element 7 and the like are transmitted and reflected by the reflection layer 6, and the reflected light is transmitted through the color filter element 7, the liquid crystal 11, the polarizing plate 13, the scattering plate 14 and the like to form an outer surface of the scattering plate 14. The light is scattered and emitted to the side, thereby displaying. In this case, the light that is reflected by the reflective layer 6 and transmitted through the liquid crystal 11, the polarizing plate 13, and the like is scattered by the scattering plate 14.
This is for preventing specular reflection and obtaining a paper white color excellent in visibility.

[0005]

However, in such a conventional liquid crystal display device, since the display surface side substrate 2 and the like are provided between the reflection layer 6 and the scattering plate 14, the liquid crystal display device may be obliquely changed in viewing angle. There has been a problem that image blurring due to so-called parallax that the image falls in love occurs. Further, in order to reduce image blur due to parallax, the amount of scattering by the scattering plate 14 cannot be increased so much that there is a problem that a sufficient paper white color cannot be obtained. SUMMARY OF THE INVENTION It is an object of the present invention to provide a liquid crystal display device in which image blur due to parallax is reduced, and a bright and uniform display quality with excellent visibility is obtained, and which is easy to manufacture.

[0006]

According to a first aspect of the present invention, there is provided a liquid crystal display device in which a liquid crystal is sealed between a display side substrate and a rear side substrate. A support layer having an uneven surface formed by transfer or printing on the inner surface of the rear substrate of the liquid crystal cell; and a reflective surface formed on the uneven surface formed on the uneven surface and following the uneven surface. And a scattering reflection layer having both a light scattering function and a light reflection function. In the liquid crystal display device according to the present invention, it is preferable that the support layer is formed of an optically isotropic material containing particles having a predetermined particle size. Further, as described in claim 3, the scattering reflection layer may be a scattering semi-transmission reflection layer that transmits a part of incident light. In that case, as described in claim 4, a protective layer is laminated on the liquid crystal side of the scattering semi-transmissive reflective layer, and the refractive index of at least two of the protective layer, the support layer, and the liquid crystal is substantially increased. Preferably, they are the same. Further, another liquid crystal display device of the present invention, as described in claim 5, on the inner surface of the rear substrate of a liquid crystal cell in which liquid crystal is sealed between a display surface substrate and a rear substrate, By transfer or printing,
A scattering reflection layer made of an optically isotropic material containing light scattering particles is formed. In another liquid crystal display device according to the present invention, as described in claim 6, the scattering / reflecting layer is a scattering / semi-transmitting / reflecting layer that transmits a part of incident light, It is preferable to provide a reflective metal film between the substrate and the rear substrate. The method of manufacturing a liquid crystal display device according to the present invention, as described in claim 7, is a method in which liquid crystal is sealed between a display surface side substrate and a back side substrate. A method for manufacturing a liquid crystal display device, comprising: a support layer having a surface; and a reflective surface having a reflective surface formed on an uneven surface following the uneven surface and having both a light scattering function and a light reflective function. A support member layer for forming the support layer, and a release layer for forming a boundary surface for facilitating separation in a later step, a particle having a predetermined particle size in one of the layers. Forming a transfer film in which a boundary surface between the release layer and the support member layer forms an uneven surface corresponding to the particle diameter of the particles by successively laminating the transfer film on the base film; After crimping the support member layer to the inner surface of the rear substrate, the The base film and the release layer is peeled off from the support member layer among the shooting film,
The step of transferring and forming a support layer having an uneven surface on the inner surface of the back side substrate, and laminating a reflective layer having an uneven surface that follows the uneven surface of the support layer on the support layer. Forming a scattering reflection layer. In the method of manufacturing a liquid crystal display device according to the present invention, it is preferable that the release layer of the transfer film include particles having a predetermined particle size. Further, as described in claim 9, the support member layer of the transfer film may include particles having a predetermined particle size. . Furthermore, another method of manufacturing a liquid crystal display device according to the present invention includes, as described in claim 10, a method of manufacturing a liquid crystal cell in which liquid crystal is sealed between a display surface side substrate and a back side substrate. A method for manufacturing a liquid crystal display device provided with a scattering / reflection layer having both a light scattering function and a light reflecting function on an inner surface, wherein a boundary surface is formed on a base film to facilitate separation in a later step. Forming a transfer film by sequentially laminating a release layer for forming the scattering reflection layer and a scattering reflection member layer for forming the scattering reflection layer, and pressing the scattering reflection member layer of the transfer film onto the inner surface of the rear substrate. Separating the base film and the release layer of the transfer film from the scattering / reflection member layer, thereby transferring and forming the scattering / reflection layer on the inner surface of the back-side substrate. Characterized by It is intended. And
According to the first aspect of the present invention, on the inner surface of the back side substrate of the liquid crystal cell, on a support layer having an uneven surface formed by transfer or printing, a scattering reflection provided with an uneven reflecting surface that follows the uneven surface. Since the layer is provided, a reflective surface with uniform unevenness is always obtained over the entire display area, image blurring due to parallax can be reduced, and the entire display area is uniformly bright, and high display quality with good visibility is stable. Can be obtained. According to the invention as set forth in claim 7, a transfer film containing particles having a predetermined particle size is transferred to the inner surface of the rear substrate of the liquid crystal cell, and the support layer having an uneven surface based on the particle size of the particles. Is formed, and the reflection layer is laminated thereon to form the scattering reflection layer. Therefore, it is possible to easily form a scattering reflection layer having a reflection surface in which the size of unevenness is accurately controlled over the entire display area. In addition, it is possible to easily manufacture a liquid crystal display device that is uniformly bright over the entire display area and that can stably obtain high display quality with good visibility. Further, according to the tenth aspect of the present invention, since the scattering reflection layer is transferred and formed on the inner surface of the rear substrate of the liquid crystal cell, the scattering reflection layer having the desired scattering reflection function can be easily formed. Can be.

[0007]

FIG. 1 is an enlarged sectional view showing a part of a main part of a reflection type liquid crystal display device according to a first embodiment of the present invention. This liquid crystal display device includes a liquid crystal cell 21 of a simple matrix type. The liquid crystal cell 21 is a display surface side substrate 22 made of a glass substrate, a film substrate, or the like.
And a rear substrate 23. Display side substrate 22
Are provided with a signal electrode 24 and an alignment film 25 on the inner surface thereof. A support layer 26 having an uneven surface is provided on the inner surface of the rear substrate 23. On the support layer 26, the support layer 26
Is provided with a scattering reflection layer 27 made of a light reflection material having an uneven surface that follows the uneven surface. Red, green, and blue color filter elements (color filter layers) 28, protective films (planarization films) 29, and scan electrodes 3 are provided on the scattering reflection layer 27.
0 and an alignment film 31 are provided.

The display side substrate 22 and the rear substrate 2
3 are bonded together via a substantially rectangular frame-shaped sealing material (not shown), and the two substrates 22 and 23 inside the sealing material are bonded together.
A liquid crystal 32 is sealed between the alignment films 25 and 31.
A retardation plate 33 is attached to the outer surface of the display surface side substrate 22 via an adhesive layer (not shown), and a polarizing plate 34 is attached to the outer surface thereof via an adhesive layer (not shown). Have been

In this liquid crystal display device, the polarizing plate 3
4 is applied to the polarizing plate 34 and the liquid crystal 3
2. The light is transmitted through the color filter element 28 and the like and is scattered and reflected by the scattering / reflection layer 27. The scattered reflected light is transmitted through the color filter element 28, the liquid crystal 32, the polarizing plate 34 and the like, and emitted to the outer surface side of the polarizing plate 34. Thus, display is performed. In this case, as the polarizing plate, only one polarizing plate 34 is provided on the display surface side of the liquid crystal cell 21, and the external light taken in can be used more effectively as compared with the case where the polarizing plate is provided on both the front and back surfaces of the liquid crystal cell 21. Can be.

As described above, in this liquid crystal display device, the support layer 2 provided on the inner surface of the rear substrate 23 of the liquid crystal cell 21 is provided.
Since the scattering / reflection layer 27 is provided on the surface 6, that is, the reflection layer also serves as the scattering layer, reflection and scattering are performed simultaneously, and therefore, image blur due to parallax can be reduced.

Next, a method of manufacturing a part of the liquid crystal display device, that is, a method of forming the scattering reflection layer 27 will be described with reference to FIG. First, a transfer film 41 shown in FIG. 2A is prepared. This transfer film 41
The lower surface of the base film 42 made of polyethylene terephthalate or the like in the drawing is provided with a boundary surface that facilitates peeling in a post-process made of a melamine-based resin or the like containing particles 43 having a predetermined particle size made of silica, resin, or the like. A structure in which a release layer 44 to be formed, a support member layer 26 ′ made of an optically isotropic material such as an acrylic resin, and a cover film 45 made of a propylene film and the like are sequentially laminated. Has become. In this case, the lower surface of the release layer 44 is controlled by controlling the particle diameter and the mixing amount of the particles 43, and the like.
It is a surface on which the irregularities of the expected size are formed uniformly. Therefore, the surface of the support member layer 26 ′ in contact with the lower surface of the release layer 44 is also a surface on which the irregularities of the desired size that follow the irregularities of the release layer 44 are uniformly formed.

Next, the cover film 45 of the transfer film 41 is peeled from the support member layer 26 ', and
As shown in (B), the support member layer 2 of the transfer film 41
After the flat lower surface of 6 ′ is pressed against the upper surface (inner surface) of the rear substrate 23 using a roller or the like, the support member layer 26 ′ is cured by baking and fixed to the upper surface of the rear substrate 23. When the support member layer 26 'is made of a photosensitive resin, the support member layer 26' may be cured by irradiation with ultraviolet rays.

Next, the release layer 44 containing the base film 42 and the particles 43 of the transfer film 41 is peeled off from the support member layer 26 '. Then, as shown in FIG. 2 (C), a support layer 26 having a surface on which unevenness of a desired size is uniformly formed is left on the upper surface of the rear substrate 23.
Next, as shown in FIG. 2D, a reflective layer made of a metal such as aluminum, silver, a silver-palladium alloy, or a silver-palladium-copper alloy is formed on the support layer 26 by a sputtering method, an evaporation method, or the like. Thus, the scattering reflection layer 27 is formed. In this case, since the thickness of the scattering reflection layer 27 is relatively thin, about 1000 to 1500 °, the scattering reflection layer 27 is formed along the uneven surface of the support layer 26, and the surface thereof is formed on the uneven surface of the support layer 26. And an uneven surface having substantially the same size as that following the above. Then, as shown in FIG. 1, a color filter element 28, a protective film 29, and a scan electrode 3 are formed on the scattering / reflection layer 27.
0 and the alignment film 31 are formed.

As described above, in the method of forming the scattering reflection layer, the lower surface of the release layer 44 of the transfer film 41 is
By controlling the particle size and mixing amount of the support member layer 2, it is possible to form a uniform uneven surface with a desired size.
The surface of the 6 ′ in contact with the release layer 44 can be easily made the surface having the same size and the desired irregularities formed uniformly. As a result, the surface of the scattering / reflecting layer 27 can be easily adjusted to a desired size only by forming the scattering / reflecting layer 27 on the supporting layer 26 transferred to the upper surface of the rear substrate 23 by a sputtering method, an evaporation method, or the like. A surface with unevenness can be uniformly formed.

In this case, for example, when the support layer 26 is formed by a photolithography method, a mask pattern,
Since the unevenness on the surface of the support layer 26 is controlled under the conditions of exposure, development, and baking, the unevenness on the surface of the support layer 26 is likely to vary. When unevenness of the surface of the support layer 26 varies, the scattering / reflection layer 27 formed thereon
Since unevenness also occurs in the unevenness of the surface, a sufficient reflection luminance cannot be obtained, the reflection luminance varies, or the reflection luminance varies from product to product.

As described above, when the support layer 26 is formed by the photolithography method, it is difficult to make the surface of the scattering / reflection layer 27 an intended uneven surface, and it is impossible to obtain a uniform reflective display quality. . On the other hand, in the case of the above embodiment, the surface of the support layer 26 transferred to the upper surface of the rear substrate 23 can be easily made the desired uneven surface,
The surface of the scattering / reflection layer 27 formed thereon can also be easily formed as a desired uneven surface, so that a uniform reflection display quality can be obtained. That is, in the case of the above-described embodiment, it is easy to form the scattering reflection layer 27 having a desired size and a uniform uneven surface, and thus to easily manufacture a liquid crystal display device that obtains a uniform reflection display quality. Can be.

Next, a case where a scattering reflection layer is formed in the liquid crystal display device according to the second embodiment of the present invention will be described with reference to FIG. First, a transfer film 51 shown in FIG. 3A is prepared. This transfer film 51
Is a release layer 53 on the lower surface of the base film 52 in the drawing.
Support member layer 5 made of an optically isotropic material such as an acrylic resin containing particles 54 having a predetermined particle size made of silica, resin, or the like.
5 'and the cover film 56 are sequentially laminated. In this case, the release layer 53 of the support member layer 55 '
The surface in contact with is a surface on which irregularities of the desired size are uniformly formed by controlling the particle size and the amount of the particles 54 mixed.

Next, the cover film 56 of the transfer film 51 is peeled off from the support member layer 55 '.
As shown in (B), the support member layer 5 of the transfer film 51 is formed.
The lower surface of 5 ′ is pressed against the upper surface (inner surface) of the rear substrate 57 using a roller or the like, and then baked to cure the support member layer 55 ′ and adhere to the upper surface of the rear substrate 57. When the support layer 26 is made of a photosensitive resin, the support layer 26 may be cured by ultraviolet irradiation.

Next, the base film 52 and the release layer 53 of the transfer film 51 are peeled off from the support member layer 55 '. Then, as shown in FIG.
On the upper surface of 7, a support layer 55 having an uneven surface containing particles 54 is left. Next, as shown in FIG. 3D, a scattering reflection layer 58 made of a metal such as aluminum, silver, a silver-palladium alloy, or a silver-palladium-copper alloy is formed on the support layer 55 by a sputtering method, an evaporation method, or the like. Form a film. Also in this case, since the thickness of the scattering / reflecting layer 58 is relatively thin, about 1000 to 1500 °, the scattering / reflecting layer 58 is formed along the uneven surface of the support layer 55, and the surface, that is, the reflection surface is This is a surface in which the irregularities of the desired size following the irregular surface of are uniformly formed.

As described above, in the method of forming the scattering / reflection layer, the surface of the transfer film 51 which is in contact with the release layer 53 of the support layer 55 is controlled by controlling the particle diameter and the amount of the particles 54 to be mixed. Can be formed on the support layer 55 transferred onto the upper surface of the rear substrate 57 by simply forming the scattering reflection layer 58 by sputtering, vapor deposition, or the like. It is possible to easily provide a surface on which irregularities of the desired size are uniformly formed. Therefore, it is possible to easily manufacture a liquid crystal display device capable of obtaining uniform reflective display quality. The support layer 5 containing the particles 54
5 may be formed by a printing method.

Next, a case where a scattering reflection layer is formed in the liquid crystal display device according to the third embodiment of the present invention will be described with reference to FIG. 4 (in this case, the surface of the scattering reflection layer is flat. is there.). First, a transfer film 61 shown in FIG. 4A is prepared. This transfer film 61
Is a release layer 63 on the lower surface of the base film 62 in the drawing.
A scattering / reflecting member for forming a scattering / reflecting layer made of an optically isotropic material such as an acrylic resin containing a light scattering particle material (not shown) such as a metal oxide such as titanium dioxide, silica, mica, and silicon powder. It has a structure in which a layer 64 'and a cover film 65 are sequentially laminated.

Next, the cover film 65 of the transfer film 61 is peeled off from the scattering / reflection layer 64.
As shown in (B), after the lower surface of the scattering / reflecting member layer 64 ′ of the transfer film 61 is pressed against the upper surface (inner surface) of the rear substrate 66 using a roller or the like, the scattering / reflecting layer 64 is cured by baking. Then, it is fixed to the upper surface of the rear substrate 66. When the optically isotropic material of the scattering / reflecting member layer 64 'is made of a photosensitive resin, it may be cured by irradiation with ultraviolet rays. Next, the base film 62 and the release layer 63 of the transfer film 61 are peeled from the scattering / reflecting member layer 64 '. Then, as shown in FIG. 4C, the scattering reflection layer 64 having a flat surface is left on the upper surface of the rear substrate 66.

In this case, the scattering / reflection layer 64 is made of an optically isotropic material such as a metal oxide such as titanium dioxide, an acrylic resin containing a light scattering particle material such as silica, mica, and silicon powder. By controlling the mixing amount of the light scattering particle material so that both the necessary reflection and scattering functions can be obtained without transmitting light, image blur due to parallax is reduced as in the case of the scattering reflection layer of the above-described embodiment. And a bright and uniform reflective display quality can be obtained. Further, when the scattering reflection layer 64 is formed, the scattering reflection layer 64 of the transfer film 61 is merely transferred onto the upper surface of the rear substrate 66, so that a liquid crystal display device having a desired uniform reflection display quality can be easily manufactured. Can be manufactured.

Next, a case where a scattering reflection layer is formed in a liquid crystal display device according to a fourth embodiment of the present invention will be described with reference to FIG. First, a transfer film 71 shown in FIG. 5A is prepared. This transfer film 71
Is a release layer 73 on the lower surface of the base film 72 in the drawing.
The scattering / reflecting member layer 74 'and the cover film 75 are made of an optically isotropic material such as an acrylic resin containing a light scattering particle material (not shown) such as a metal oxide such as titanium dioxide, silica, mica, and silicon powder. It has a structure of being sequentially laminated. In this case, the content and the thickness of the light scattering particle material are adjusted in the scattering / reflecting member layer 74 'so that a necessary and sufficient light scattering function can be obtained. Therefore, the scattering reflection layer 74 of the present embodiment is a scattering transflective layer that transmits a part of incident light without being reflected.

Next, the cover film 75 of the transfer film 71 is peeled off from the scattering / reflecting member layer 74 ', and then, as shown in FIG. Aluminum, silver, silver-palladium alloy, provided in advance on the upper surface (inner surface) of the side substrate 66;
Reflective metal film 7 made of a metal such as silver-palladium-copper alloy
After being press-bonded to the upper surface of 7 using a roller or the like, the scattering / reflecting member layer 74 ′ is cured by baking and fixed to the upper surface of the reflective metal film 77. When the optically isotropic material of the scattering / reflecting member layer 74 'is made of a photosensitive resin, the material may be cured by ultraviolet irradiation. Next, the base film 72 and the release layer 73 of the transfer film 71 are separated from the scattering / reflecting member layer 74 '. Then, FIG. 5 (C)
As shown in the figure, a scattering reflection layer 74 having a flat surface is left on the upper surface of the reflection metal film 77 on the rear substrate 66.

In this case, on the upper surface of the reflection metal film 77 on the rear substrate 66, the scattering reflection layer 7 having a scattering function is provided.
4, the reflection metal film 77 and the scattering reflection layer 74 are provided.
Thus, both of the reflection and scattering functions required are exhibited, so that image blur due to parallax can be reduced, and a bright and uniform reflective display quality can be obtained. When the scattering reflection layer 74 is formed, the transfer film 71
Is merely transferred onto the upper surface of the reflective metal film 77 on the rear substrate 66, so that a liquid crystal display device having bright and uniform reflective display quality can be easily manufactured.

In the third and fourth embodiments, the scattering / reflecting layers 64 and 74 are made of a metal oxide such as titanium dioxide, or an optical resin such as an acrylic resin containing a light scattering particle material such as silica, mica, or silicon powder. Although the case of forming with an isotropic material has been described, the present invention is not limited to this, and it may be formed with an optical isotropic material such as an acrylic resin containing a fluorescent material, or may be formed with only a fluorescent material. May be. In the third and fourth embodiments, the case where the scattering reflection layers 64 and 74 are formed by the transfer method has been described. However, the present invention is not limited to this, and the scattering reflection layers 64 and 74 may be formed by the printing method. That is, a method of directly printing an optically isotropic material such as an acrylic resin containing a light scattering particle material or a fluorescent material on a transparent substrate using a relief printing plate.

In each of the above embodiments, the case where the present invention is applied to a reflection type liquid crystal display device has been described. However, the present invention is not limited to this. For example, as in a fifth embodiment of the present invention shown in FIG. The present invention can also be applied to a transflective liquid crystal display device. Next, the transflective liquid crystal display device will be described. In FIG. 6, the same components as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

In the liquid crystal display device shown in FIG. 6, a retardation plate 81 is attached to the outer surface of the rear substrate 23 via an adhesive layer (not shown), and a polarizing plate 82 is attached to the outer surface of the adhesive layer (not shown). (Not shown), and a backlight 83 is arranged on the outer surface side thereof. Then, similarly to the first embodiment, a support layer 26 made of an optically isotropic material having an uneven surface of a predetermined size is formed on the inner surface of the rear substrate 23, and a scattering layer made of a metal layer is formed on the uneven surface. Transflective layer 2
7A is provided. The scattering semi-transmissive reflection layer 27A has a structure having necessary light scattering and reflecting functions and light transmitting functions by reducing the film thickness to about 300 to 700 ° or forming slits or the like. In the case where the scattering / reflecting layer is formed by mixing light scattering particles with an optically isotropic material without forming an uneven support layer as in the third embodiment, the film thickness may be reduced or the light scattering particle material may be used. By adjusting the mixing amount of a small amount, a desired scattering semi-transmissive reflection layer can be formed.

When the liquid crystal display device is used as a reflection type, the backlight 83 is not turned on, and external light incident from the outer surface of the polarizing plate 34 on the display surface side is reflected by the polarizing plate 34 and the liquid crystal 32. , The light is transmitted through the color filter element 28 and the like, and is scattered and reflected by the scattering semi-transmissive reflection layer 27A.
4 and the like are transmitted and emitted to the outer surface side of the polarizing plate 34, thereby performing display. On the other hand, when this liquid crystal display device is used as a transmission type, the backlight 83 is turned on,
The light from the backlight 83 is transmitted through the polarizing plate 82, the scattering semi-transmissive reflection layer 27A, the color filter element 28, the liquid crystal 32, the polarizing plate 34, and the like, and is emitted to the outer surface side of the polarizing plate 34.
Thus, display is performed.

By the way, when the scattering semi-transmissive reflection layer 27A of this liquid crystal display device is made of a metal layer provided on a support layer 26 having an uneven surface as shown in FIG. As shown by the arrows in the figure, the backlight caused by the difference in the refractive index between the support layer 26 having a relatively large thickness and the protective layer 29 and between the protective layer 29 and the liquid crystal (layer) 32. The parallel light emitted from 83 is gradually diffused while passing through each of the members, and the brightness of the display is reduced. The refraction when transmitting through the scattering semi-transmissive reflection layer 27A and the color filter element 28 can be neglected because their respective film thicknesses are thin. Here, as an example, each film thickness of the support layer 26, the scattering semi-transmissive reflective layer 27A, the color filter element 28, the protective layer 29, and the liquid crystal (layer) 32 is 2.5
μm, 0.2 μm, 1.0 μm, 2.5 μm, 5 μm.

Therefore, first, the refractive indexes of the protective layer 28 and the liquid crystal 32 are made substantially the same. In this embodiment, a p-type liquid crystal having an ordinary light refractive index no of 1.5 and an extraordinary light refractive index ne of 1.9 is used, so that the protective layer 28 is the same as the ordinary light refractive index (1.5) of the liquid crystal 32. It is formed of an acrylic resin having a refractive index of. As a result, as shown by arrows in FIG. 8, light diffusion due to refraction in the optical path from the protective layer 29 to the liquid crystal 32 via the electrode 30 and the alignment film 31 is substantially eliminated. Since the electrode 30 and the alignment film 31 are also thin, refraction when transmitting them is negligible. Further, the support layer 26 and the protective layer 29 are provided with an ordinary refractive index (1.
When formed of an acrylic resin having substantially the same refractive index as that of 5), the light emitted from the backlight 83 can be transmitted to the liquid crystal 32 with almost no diffusion, as indicated by arrows in FIG. it can. Thus, light incident on the liquid crystal cell from the backlight 83 is used for display without waste, and a bright display is obtained. That is,
According to the liquid crystal display device of the present embodiment, when performing a reflection type display, the light scattering reflection function of the scattering semi-transmissive reflection layer can provide a reflective display quality in which the entire display region is uniformly bright and has excellent visibility, When performing transmissive display, diffusion of transmitted light is prevented, and a bright transmissive display quality with excellent light use efficiency is obtained.

In each of the above embodiments, the case where the present invention is applied to a simple matrix type liquid crystal display device has been described, but the present invention is not limited to this. For example,
As in the sixth embodiment of the present invention shown in FIG. 10, the present invention can be applied to an active matrix type liquid crystal display device. Next, the active matrix type liquid crystal display device will be described.

This liquid crystal display device has an active matrix type liquid crystal cell 91. The liquid crystal cell 91 includes a display surface side substrate 92 and a back side substrate 93 made of a glass substrate, a film substrate, or the like. Red, green, and blue color filter elements 94 and a common electrode 9 are provided on the inner surface of the display surface side substrate 92.
5 and an alignment film 96 are provided. Back side substrate 93
A thin film transistor 97, an insulating film 98, a pixel electrode 99, and an alignment film 100 are provided on the inner surface of the device. In this case, like the support layer 26 shown in FIG. 1, for example, the insulating film 98 has a surface on which irregularities of a desired size are uniformly formed. Therefore, the surface of the pixel electrode 99 provided on the insulating film 98 is also a surface on which the desired unevenness is formed. The pixel electrode 99 is made of a metal such as aluminum, silver, a silver-palladium alloy, and a silver-palladium-copper alloy, and also functions as a scattering reflection layer.

Then, the display surface side substrate 92 and the back side substrate 9
3 are bonded together via a substantially rectangular frame-shaped sealing material (not shown), and the two substrates 92 and 93 inside the sealing material are bonded together.
A liquid crystal 101 is sealed between the alignment films 96 and 100. A retardation plate 102 is attached to the outer surface of the display surface side substrate 92 via an adhesive layer (not shown), and a polarizing plate 103 is attached to the outer surface via an adhesive layer (not shown). Has been.

In this liquid crystal display device, the polarizing plate 1
03 is transmitted through the polarizing plate 103, the color filter element 94, the liquid crystal 101 and the like and is scattered and reflected by the pixel electrode 99. The scattered reflected light is
The light is transmitted through the color filter element 94, the polarizing plate 103, and the like, and emitted to the outer surface side of the polarizing plate 103, thereby performing display.

[0037]

As described above, according to the first aspect of the present invention, the uneven surface is formed on the support layer having the uneven surface formed by transfer or printing on the inner surface of the rear substrate of the liquid crystal cell. Is provided with a scattering reflection layer with an uneven reflection surface that follows the surface, so that a reflection surface with uniform unevenness is always obtained over the entire display area, image blur due to parallax can be reduced, and uniform brightness over the entire display area can be achieved. Thus, high display quality with good visibility can be stably obtained. According to the invention as set forth in claim 7, a transfer film containing particles having a predetermined particle size is transferred to the inner surface of the rear substrate of the liquid crystal cell, and the support layer having an uneven surface based on the particle size of the particles. Is formed, and the reflection layer is laminated thereon to form the scattering reflection layer. Therefore, it is possible to easily form a scattering reflection layer having a reflection surface in which the size of unevenness is accurately controlled over the entire display area. In addition, it is possible to easily manufacture a liquid crystal display device which is uniformly bright over the entire display area and has a high display quality with good visibility stably. Claim 10
According to the invention described in (1), since the scattering reflection layer is transferred and formed on the inner surface of the rear substrate of the liquid crystal cell, the scattering reflection layer having the above-mentioned desired scattering reflection function can be easily formed.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a part of a main part of a liquid crystal display device according to a first embodiment of the present invention.

FIGS. 2A to 2D are cross-sectional views for explaining a method of forming the scattering reflection layer shown in FIG. 1;

FIGS. 3A to 3D are cross-sectional views for explaining a method of forming a scattering reflection layer in a liquid crystal display device according to a second embodiment of the present invention.

FIGS. 4A to 4C are cross-sectional views for explaining a method of forming a scattering reflection layer in a liquid crystal display device according to a third embodiment of the present invention.

FIGS. 5A to 5C are cross-sectional views for explaining a method of forming a scattering reflection layer in a liquid crystal display device according to a fourth embodiment of the present invention.

FIG. 6 is a sectional view of a main part of a liquid crystal display device according to a fifth embodiment of the present invention.

7 is a cross-sectional view for explaining a problem when the liquid crystal display device shown in FIG. 6 is used as a transmission type.

FIG. 8 is a sectional view for explaining a first method for solving the problem shown in FIG. 7;

FIG. 9 is a sectional view for explaining a second method for solving the problem shown in FIG. 7;

FIG. 10 is a sectional view of a main part of a liquid crystal display device according to a sixth embodiment of the present invention.

FIG. 11 is a partial cross-sectional view of an example of a conventional liquid crystal display device.

[Explanation of symbols]

 Reference Signs List 21 liquid crystal cell 22 display surface side substrate 23 back side substrate 24 signal electrode 25 alignment film 26 support layer 27 scattering reflection layer 28 color filter element 29 protective film 30 scan electrode 31 alignment film 32 liquid crystal 33 retardation plate 34 polarizing plate

Continued on the front page (72) Inventor Toshiharu Nishino 5 Casio Computer, Hachioji Research Laboratory, 2951, Ishikawacho, Hachioji-shi, Tokyo (72) Inventor Masayuki Takahashi 5 Casio Computer Stock, 2951 Ishikawacho, Hachioji-shi, Tokyo F-term in the Hachioji Research Laboratories (reference) ED13 ED14

Claims (10)

[Claims] 1. A support layer having an uneven surface formed by transfer or printing on an inner surface of a rear substrate of a liquid crystal cell in which liquid crystal is sealed between a display surface substrate and a rear substrate. A scattering reflection layer formed on the uneven surface and provided with a reflecting surface formed on the uneven surface following the uneven surface and having both functions of a light scattering function and a light reflecting function, is provided. Liquid crystal display device. 2. The liquid crystal display device according to claim 1, wherein the support layer is made of an optically isotropic material containing particles having a predetermined particle size. 3. The liquid crystal display device according to claim 1, wherein the scattering reflection layer is a scattering transflective layer that transmits a part of incident light. 4. The liquid crystal display according to claim 3, wherein a protective layer is laminated on the liquid crystal side of the scattering semi-transmissive reflective layer, and at least two of the protective layer, the support layer, and the liquid crystal.
The liquid crystal display device, wherein the two refractive indexes are substantially the same. 5. An optically isotropic material containing light-scattering particles by transfer or printing on the inner surface of the rear substrate of a liquid crystal cell in which liquid crystal is sealed between a display surface substrate and a rear substrate. A liquid crystal display device comprising a scattering reflection layer made of: 6. The scattering reflection layer according to claim 5, wherein the scattering reflection layer is a scattering semi-transmissive reflection layer that transmits a part of incident light, and the light is reflected between the scattering semi-transmissive reflection layer and the rear substrate. A liquid crystal display device provided with a metal film. 7. A support layer having an uneven surface on the inner surface of the rear substrate of a liquid crystal cell having liquid crystal sealed between a display surface substrate and a rear substrate, and an uneven surface following the uneven surface. A method for manufacturing a liquid crystal display device provided with a scattering reflection layer having both functions of a light scattering function and a light reflection function having a reflection surface formed on a support member layer for forming the support layer A release layer for forming a boundary surface that facilitates peeling in a later step,
Any one of the layers contains particles having a predetermined particle size and is sequentially laminated on a base film so that a boundary surface between the release layer and the support member layer forms an uneven surface corresponding to the particle size of the particles. Forming a transfer film, and after pressing the support member layer of the transfer film against the inner surface of the rear substrate, peeling the base film and the release layer of the transfer film from the support member layer, The step of transferring and forming a support layer having an uneven surface on the inner surface of the back side substrate, and laminating a reflective layer having an uneven surface that follows the uneven surface of the support layer on the support layer. Forming a scattering reflection layer. 8. The method according to claim 7, wherein the release layer of the transfer film contains particles having a predetermined particle size. 9. The method according to claim 7, wherein the support member layer of the transfer film contains particles having a predetermined particle size. 10. A scattering / reflecting layer having both a light scattering function and a light reflecting function is provided on the inner surface of the rear substrate of a liquid crystal cell in which liquid crystal is sealed between a display surface substrate and a rear substrate. A method for manufacturing a provided liquid crystal display device, comprising: a release layer for forming a boundary surface on a base film for facilitating separation in a later step; and a scattering / reflecting member layer for forming the scattering / reflecting layer. Forming a transfer film by successively laminating the base film and the release layer of the transfer film after pressing the scattering reflection member layer of the transfer film on the inner surface of the rear substrate. Peeling off the reflective member layer, thereby transferring and forming the scattering reflective layer on the inner surface of the rear substrate.