JPH02214822A - Liquid crystal display element - Google Patents

Abstract

PURPOSE:To obtain the liquid crystal display element which has no shades of display patterns on a reflecting plate and has excellent visibility by diffusing the light past a liquid crystal cell by a light diffusion plate having a rugged surface or a light diffusion plate fixed with many transparent beads. CONSTITUTION:A 1st polarizing plate 7a and a 2nd polarizing plate 7b are provided on both surfaces of the liquid crystal cell 6. The light diffusion plate 11 is one-side ground glass having the rugged surface 12 and the reflecting plate 8 consisting of a polyester film deposited with aluminum by evaporation is provided on the smooth surface thereof. This light diffusion plate 11 and the reflecting plate 8 are fixed in the form of being superposed on the 2nd polarizing plate 7b to the liquid crystal cell 6. The display patterns 9 are, therefore, visible in the same manner as heretofore, but the light past the liquid crystal cell 6 is diffused by the rugged surface 12 of the light diffusion plate 11. The formation of the distinct shadows is averted in this way and the double appearance of the display patterns is obviated. The extremely good visibility is thus obtd.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a reflective liquid crystal display element.

2. Description of the Related Art In general, liquid crystal display elements have come to be used as display devices in trains, home appliances, office automation equipment, etc. because they are thin, lightweight, and consume little power.

FIG. 6 is a block diagram of a conventional liquid crystal display element, in which transparent electrodes 1a
11b, and an alignment film 2a thereon.

A liquid crystal 4 is sandwiched between a first glass substrate 3a and a second glass substrate 3b on which glass substrates 2b are provided, and the liquid crystal 4 is sealed with a sealing material 6. A first layer is provided on the upper surface and the lower surface of the liquid crystal cell 6 having such a configuration.
A polarizing plate element a, a second polarizing plate 7b are provided, and a second substrate 7
A reflective plate 8 provided with a reflective material was disposed on the lower surface of b.

Problems to be Solved by the Invention Figures 6a and 6b are diagrams explaining the appearance when such a conventional liquid crystal display element is turned on, where 9 is the display pattern of the liquid crystal cell 6, and 1o is based on this display pattern 9. It's a shadow.

In this way, in the conventional liquid crystal display element, in addition to the display pattern of the liquid crystal cell 6 being visible as a display, the shadow 1 of the display pattern 9 is also visible.
Since 0 is formed on the reflective plate 83 page, there is a problem in that the display appears double as shown in FIG. 6, making it difficult to visually recognize the display contents.

SUMMARY OF THE INVENTION In view of these problems, it is an object of the present invention to provide a liquid crystal display element in which there is no shadow of a display pattern and display contents are easily visible.

Means for Solving the Problems In order to achieve the above object, the present invention provides a first substrate of a liquid crystal cell in which a liquid crystal material is sandwiched between a transparent first substrate having a transparent electrode and a second substrate. A transparent light diffusing plate having a first polarizing plate on the upper surface and having an uneven upper surface and a reflecting plate provided with a reflective material are stacked and arranged on the lower surface of the second substrate, between the second substrate and the light diffusing plate;
Alternatively, a second polarizing plate is disposed between the light diffusing plate and the reflecting plate.

Effect: With this configuration, the light that has passed through the liquid crystal cell is diffused on the uneven surface of the light diffusing plate and is uniformly incident on the reflecting plate, so that no shadow is formed on the reflecting plate. Therefore, it is possible to realize a liquid crystal display element with good visibility without display pattern shadows.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

Example 1 In FIG. 1, 6 is a liquid crystal cell. This liquid crystal cell 6 has two glass substrates each having a transparent electrode on one side and an alignment film provided thereon, with the alignment film forming surfaces facing each other, and a liquid crystal placed between the two glass substrates. It is sealed. A first polarizing plate 7 & a second polarizing plate are provided on both sides of the liquid crystal cell 6, respectively.
A polarizing plate 7b is provided. 11 is a light diffusing plate with a thickness of 1
It is single-sided ground glass with a rough uneven surface 12. A reflecting plate 8 made of a polyester film on which aluminum is vapor-deposited is provided on the smooth surface of the light diffusing plate 11.

The light diffusing plate 11 and the reflecting plate 8 are fixed to the liquid crystal cell 6 with an adhesive 13 so as to overlap the second polarizing plate 7b.

Figure 1 on page 6 is a diagram explaining the state when the liquid crystal display element according to the present invention is used.The display pattern 9 looks the same as the conventional one, but the light passing through the liquid crystal cell 6 is caused by the unevenness of the light diffusing plate 11. Since the light is diffused at the surface 12, it is uniformly incident on the polyester film, and no clear shadow is formed. Therefore, the display pattern does not appear double, and visibility is very good.

Embodiment 2 FIG. 2 is a side view of a light diffusing plate 14 in a second embodiment, in which an ultraviolet curable resin is applied to one surface of a glass plate 14a with a thickness of 1, and glass beads 14b having a particle size of about 6 μm are coated. (WGB264 manufactured by Toshiba Ballotini Corporation) was sprinkled thereon and then irradiated with ultraviolet rays, thereby fixing the glass beads 14b onto the glass plate 141L. This embodiment has the same structure as the first embodiment except that this light diffusion plate 14 is used in place of the light diffusion plate 11 of the first embodiment. Also in this liquid crystal display element, the glass beads 14 of the light diffusing plate 14
b diffuses the light, making it possible to obtain a display with no shadows and excellent visibility.

Embodiment 3 FIG. 3 is a side view of the third embodiment, in which the second polarizing plate 7b is placed between the light diffusing plate 11 and the reflecting plate 8. In this embodiment as well, the same effects as in the first embodiment can be obtained.

Embodiment 4 FIG. 4 is a sectional view of a liquid crystal module according to a fourth embodiment. The liquid crystal cell 6 with polarizing plates a and 7b attached is as follows:
It is supported by a frame 17 and zebra rubber 18 and attached to a printed circuit board 16 equipped with a driving LS 116, etc., and a light diffusing plate 11 and a reflecting plate 8 similar to those in the first embodiment are attached to the printed circuit board 16. As described above, the effects of the present invention can be obtained even if the light diffusing plate 11 and the reflecting plate 8 are separated from the liquid crystal cell/L/6 and attached to the printing substrate 16.

Further, the second polarizing plate 7b, the light diffusing plate 11, and the reflecting plate 8 may be attached to the printed circuit board 16 apart from the liquid crystal cell 6, or only the reflecting plate 8 may be separated from the liquid crystal cell 6.

Page 7 Furthermore, the same effect can be obtained by using the light diffusing plate 14 used in the second embodiment.

In the present invention, the thickness of the light diffusing plate 11 is 1 mm, but it does not necessarily have to be 1 mm as long as the incident light is sufficiently diffused and no shadow of the display pattern is formed.
The plate thickness may be changed as appropriate depending on the refractive index of 1 and the degree of unevenness.

Effects of the Invention As described above, according to the present invention, light passing through a liquid crystal cell is diffused by a light diffusing plate having an uneven surface or a light diffusing plate having a large number of transparent beads fixed to it. A liquid crystal display element with excellent visibility without display pattern shadows can be realized.

[Brief explanation of the drawing]

FIG. 1a is a side view illustrating the structure of a liquid crystal display element according to a first embodiment of the present invention, FIG. 1 is an explanatory diagram for explaining the present invention in detail, and FIG. FIG. 3 is a side view of a liquid crystal display element according to a third embodiment of the present invention, and FIG. 4 is a cross-sectional view of a liquid crystal module according to a fourth embodiment of the present invention. , FIG. 6 is a cross-sectional view of a conventional liquid crystal display element, and FIG. 6 is an explanatory diagram illustrating how the display pattern of the conventional liquid crystal display element looks. 6...Liquid crystal cell ya, yb...Polarizing plate, 8...Reflecting plate, 11.14...Light diffusing plate,
12... uneven surface, 14a... glass plate,
14b...Glass Peas. Name of agent: Patent attorney Shigetaka Awano and one other person
castle map

Claims (2)

[Claims] (1) A first polarizing plate is provided on the upper surface of the first substrate of a liquid crystal cell in which a liquid crystal material is sandwiched between a transparent first substrate having a transparent electrode and a second substrate, and the upper surface is uneven. A transparent light diffusing plate formed on a surface and a reflecting plate provided with a reflective material are stacked and arranged on the lower surface of the second substrate, and between the second substrate and the light diffusing plate, Or a liquid crystal display element in which a second polarizing plate is disposed between the light diffusing plate and the reflecting plate. (2) The liquid crystal display element according to claim 1, wherein instead of the transparent light diffusing plate having an uneven upper surface, a light diffusing plate having a large number of transparent beads fixed to the upper surface is used.