JPH08334758A - Reflection type liquid crystal display device - Google Patents

Abstract

PURPOSE: To obtain an reflection type display device which is bright and has good visibility by providing a reflection plate with a means for reflecting light in a direction different from the direction of specular reflection. CONSTITUTION: Polarizing plates are formed on the respective surface of a lower electrode substrate and upper electrode substrate on the sides not formed with electrodes and further, the reflection plate 14 is formed on the outer side of the polarizing plate of the lower polarizing substrate. The reflection plate 14 is constructed by forming a thin aluminum film 21 by a vapor deposition method on an org. resin film 20 provided with rugged shapes by fine working on its front surface in order to control the direction of the reflected light and further, covering the reflection surface 23 with a tacky adhesive 22. The reflection plate 14 having the reflected light intensity distribution different in the direction where the max. reflection intensity is obtainable from the specular reflection direction is used and, therefore, a difference arises between the angle at which the reflected light intensity from the reflection plate 14 is maximized and the angle at which the reflected light intensity of the surface of the display device is maximized. The reflection and projection on the surface of the display device are not got into the viewer's nerves even at the angle at which the screen is visible bright. The good image display having the excellent visibility is obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflection type liquid crystal display device, and more particularly to a reflection plate for improving visibility.

[0002]

2. Description of the Related Art Conventionally, as a reflection plate of a reflection type liquid crystal display device, a film in which a thin film of a material having a high reflectance such as aluminum is formed is often used. The direction of the reflected light that is reflected by this reflector becomes the same as the direction of the reflected light that is reflected by the surface of the display device, and as a result, the display is viewed at an angle that allows the brightest reflected light from the reflector to be captured. If this is attempted, there is a problem in that the visibility is extremely poor, such as the contrast being lowered and the reflection of the light source being noticeable. Therefore, conventionally, the angle from which the light from the reflection plate can be captured brightest must be removed, and the light intensity must be observed from a slightly low angle.

[0003]

DISCLOSURE OF THE INVENTION As described above,
The conventional reflective liquid crystal display device has problems such as low contrast and the phenomenon of reflection of a light source when it is observed from the direction in which the reflected light from the reflector is most strongly captured. The present invention has been made in view of the above problems, and an object of the present invention is to provide a bright reflective display device with good visibility.

[0004]

The present invention comprises two electrode substrates having electrodes formed on one surface and a liquid crystal sandwiched between two electrode substrates arranged in parallel with the electrodes inside. A reflection type liquid crystal display device comprising a liquid crystal cell and a reflection plate formed on one surface of the liquid crystal cell, wherein the reflection plate has means for reflecting light in a direction different from the direction of regular reflection. It is a device.

[0005]

The reflector having the light intensity distribution in the reflected light direction different from the light intensity distribution in the reflected light direction in the case of specular reflection has a direction in which the light from the outside reflected on the surface of the display device is captured most strongly, It has the effect of changing the direction in which the reflected light from the reflector is captured most strongly.

[0006]

An embodiment of the present invention will be described in detail below with reference to the drawings. As shown in FIG. 1, in the reflective liquid crystal display device of this embodiment, first, an electrode 2 is formed on one surface of a glass substrate 1, and a lower side on which an alignment film 3 having an alignment treatment is formed is formed on the electrode 2. There is an electrode substrate 4. Further, there is an upper electrode substrate 8 in which an electrode 6 is formed on one surface of another glass substrate 5, and an alignment film 7 which has been subjected to an alignment treatment is formed on an upper layer thereof.

Then, the lower electrode substrate 4 and the upper electrode substrate 8 are arranged in parallel with the electrodes 2 and 6 inside, and a spacer 9 and a sealing material 10 are interposed therebetween, and a liquid crystal 11 is sealed in the liquid crystal cell. Becomes

Polarizing plates 12 and 13 are formed on the surfaces of the lower electrode substrate 4 and the upper electrode substrate 5, respectively, on which the electrodes 2 and 6 are not formed. Further, a reflection plate 14 is formed outside the polarizing plate 12 on the lower electrode substrate 4 side.

Here, in order to control the direction of the reflected light, the reflection plate 14 of the present embodiment has an organic resin film 20 whose surface is provided with irregularities by fine processing, as shown in FIG. In this structure, an aluminum thin film 21 is formed by a vapor deposition method, and a reflection surface 23 of the aluminum thin film 21 is covered with an adhesive 22.

At this time, the fine pattern of the film 20 is
For example, when the angle θ shown in FIG. 3 is processed so that θ = 10 °, the reflected light intensity distribution as shown in FIG. 4 is obtained. FIG. 5 is a reflected light intensity distribution in regular reflection.

By changing this angle θ, the direction in which the maximum reflected light intensity is obtained can be arbitrarily controlled. According to the configuration of the reflection type liquid crystal display device in the present embodiment, the reflection plate 14 having the reflected light intensity distribution in which the direction in which the maximum reflection intensity is obtained is different from the regular reflection direction is used.
There is a difference between the angle at which the intensity of the reflected light from the reflector 14 is maximized and the angle at which the intensity of the reflected light on the surface of the display device is maximized.
It is possible to realize good image display with excellent visibility without worrying about glare.

Although the simple matrix type liquid crystal display device has been described in this embodiment, an active matrix type liquid crystal display device using a switching element or the like,
It can also be applied to a liquid crystal display device that does not use a polarizing plate.
Furthermore, the shape of the unevenness is not limited to this embodiment. As described above, it goes without saying that many modifications and changes can be added to the present embodiment within the scope of the present invention.

[0013]

According to the present invention, a reflector having a light intensity distribution in the reflected light direction different from the light intensity distribution in the reflected light direction in the case of specular reflection is used in the reflection type liquid crystal display device. Even when observing from the direction in which the reflected light is captured most strongly, it is not the direction in which the light reflected from the surface of the display device from the outside is captured most strongly. Therefore, observe the display from the direction with bright and good visibility. Will be possible.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a reflective liquid crystal display device in an example of the present invention.

FIG. 2 is an enlarged cross-sectional view of a reflection plate according to the embodiment of the present invention.

FIG. 3 is an enlarged view of the reflection plate of FIG.

FIG. 4 is a graph showing a light intensity distribution of a reflecting plate according to an example of the present invention.

FIG. 5 is a graph showing a light intensity distribution of regular reflection.

[Explanation of symbols]

 2, 6 ... Electrodes 4, 8 ... Electrode substrate 11 ... Liquid crystal 14 ... Reflector 23 ... Reflective surface

Claims (5)

[Claims] 1. A liquid crystal cell comprising two electrode substrates each having an electrode formed on one surface, and a liquid crystal sandwiched between the two electrode substrates arranged in parallel with the electrodes inside, and the liquid crystal. A reflection type liquid crystal display device in which a reflection plate is formed on one surface of a cell, wherein the reflection plate has means for reflecting light in a direction different from the direction of regular reflection. 2. The reflection type liquid crystal display device according to claim 1, wherein the reflector has means for making a direction in which a maximum reflected light intensity is obtained different from a direction in which a maximum reflected light intensity by regular reflection is obtained. A reflective liquid crystal display device characterized by the above. 3. The reflection type liquid crystal display device according to claim 1, wherein the reflection plate is provided with means for making a distribution of reflected light intensity different from a distribution of reflected light intensity of regular reflection. Liquid crystal display device. 4. The reflection type liquid crystal display device according to claim 1, 2 or 3, wherein the reflection surface of the reflection plate has a shape provided with irregularities. 5. The reflection type liquid crystal display device according to claim 1, 2 or 3, wherein the reflection plate is formed by forming a thin film having a highly reflective surface on a film provided with unevenness. Reflective liquid crystal display device.