JPH0535432B2 - - Google Patents

Description

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

[Background of the invention]

Conventional liquid crystal display elements, especially twisted nematic type liquid crystal display elements, as shown in FIG. The liquid crystal cell is constructed by arranging the liquid crystal cells 2 and 2 to face each other so that their orientation directions intersect, for example, at 90 degrees, sealing the periphery with a sealing material 3, and sealing the liquid crystal 4 inside.

A reflective liquid crystal display element 8 is obtained by bonding a polarizing plate 5 to the outside of the upper electrode substrate 1 and a reflecting plate 7 to the outside of the lower electrode substrate 2 via the polarizing plate 6 of the liquid crystal cell constructed in this way. Configure. When the polarizing plates 5 and 6 are arranged in this manner, they are usually arranged in the relationship shown in FIG. 2 so that either their polarization axes or their absorption axes are parallel to the alignment direction.

In FIG. 2, 1a is the orientation direction of the surface of the upper electrode substrate 1, 2a is the orientation direction of the surface of the lower electrode substrate 2,
By adopting such a configuration, when the twist angle β of the liquid crystal molecules is 90 degrees or less, the liquid crystal molecules are normally twisted in the direction shown by 9, and when a voltage is applied between the upper and lower electrode substrates 1 and 2, the twist angle β is 90 degrees or less. The direction shown is the viewing angle. Furthermore, even when the twist angle β is 90 degrees or more, the normal relationship shown in FIG. 2 can be maintained by adding an appropriate optically active substance. 5
a is the polarization axis or absorption axis of the upper polarizing plate 5, which is parallel to the alignment direction 1a on the surface of the upper electrode substrate 1. 6a
is the polarization axis or absorption axis of the lower polarizing plate 6, which is parallel to the alignment direction 2a on the surface of the lower electrode substrate 2. Therefore, the angle α formed by the polarization axes or absorption axes of the upper and lower polarizing plates 5 and 6 is equal to the twist angle β.

Incidentally, since the reflecting plate 7 shown in FIG. 1 reflects incident light from almost all angles, as shown in FIG. ) 11, a shadow 13 of the display 12 is visible. This generally widens the viewing angle range of the liquid crystal display element 8, which is convenient (Japanese Patent Publication No. 57-43906).

However, for certain purposes, for example, as shown in FIG. 4, for games, two liquid crystal display elements 8 are arranged side by side so that the viewing angle direction 10 is reversed, and two people face each other to play a game. When configured,
It is necessary to provide a blinding plate 14 between the liquid crystal display elements 8, 8 so that the other party's display cannot be seen. As described above, the conventional liquid crystal display element 8 is inconvenient when the shadow 13 is difficult to see depending on the specific application.

[Purpose of the invention]

An object of the present invention is to provide a reflective liquid crystal display element in which the shadow of the display is not visible from the opposite direction of the viewing angle.

[Summary of the invention]

In order to achieve the above object, the present invention seals the periphery of two upper and lower electrode substrates with electrodes formed on opposing surfaces with a sealing material, seals liquid crystal inside, and seals the periphery of two upper and lower electrode substrates with electrodes formed on opposing surfaces, seals a liquid crystal inside, and seals the periphery of two upper and lower electrode substrates with electrodes formed on opposing surfaces, seals a liquid crystal inside, and seals the outer side of the one lower electrode substrate. The liquid crystal display device provided with a reflective plate is characterized in that the reflective plate is formed in a sawtooth shape with a slope on the viewing angle side of the liquid crystal display device.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG. Note that the same members as in FIGS. 1 to 4 are designated by the same reference numerals, and their explanations will be omitted. The reflective surface of the reflective plate 15 is formed in a sawtooth shape with a slope on the viewing angle direction 10 side. When formed like this,
Incident light from the viewing angle direction 10 and the anti-viewing angle direction 11 are both reflected in the viewing angle direction 10, so that the shadow of the display 12 is no longer visible when viewed from the anti-viewing angle direction 11.

Therefore, when such a liquid crystal display element 16 is used for a game or the like, two liquid crystal display elements 1 are arranged so that the viewing angle direction 10 is reversed, as shown in FIG.
When 5 and 15 are used side by side, the other party's display cannot be seen, so the blind plate 12 as shown in FIG. 4 is not required.

FIG. 7 shows another embodiment of the invention. The liquid crystal display element 17 shown in this embodiment is aligned so that the viewing angle direction 10 is reversed in the left and right halves. Further, the reflective surface of the reflective plate 15 is also formed by forming slopes in opposite halves on the left and right sides in accordance with the viewing direction 10.
When formed in this way, a more compact liquid crystal display element for opposing games can be obtained.

In the above embodiment, the case where the polarizing plates 5 and 6 were provided on the outside of the upper and lower electrode substrates 1 and 2 was explained. In the case of using the substrate as a substrate, it goes without saying that it is not necessary to provide the polarizing plates 5 and 6.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the reflection plate is formed in a sawtooth shape with the viewing angle direction side of the liquid crystal display element being sloped, so that the shadow of the display is not seen from the opposite direction of the viewing angle. You can make it invisible.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of a conventional liquid crystal display element, FIG. 2 is an explanatory diagram showing the relationship between the orientation treatment direction and the axis of the polarizing plate, and FIG. 3 is an explanatory diagram of the liquid crystal display element shown in FIG. 4 shows a game using the liquid crystal display element of FIG. 1, a is a plan view, b is a front view, and FIG. 6 shows a game using the liquid crystal display element of FIG. 5, a is a plan view, b is a front view, and FIG. Figure 1b is a front view. 1... Upper electrode substrate, 2... Lower electrode substrate, 3...
Seal material, 4...Liquid crystal, 10...Viewing angle direction, 1
1... Anti-viewing angle direction, 12... Display, 15... Reflection plate, 16, 17... Liquid crystal display element.

Claims (1)

[Claims] 1. In a liquid crystal display element in which the peripheries of two upper and lower electrode substrates with electrodes formed on opposing surfaces are sealed with a sealing material, a liquid crystal is sealed inside, and a reflector is disposed on the outside of one of the lower electrode substrates. . A reflective liquid crystal display element, characterized in that the reflective plate is formed in a sawtooth shape with an inclined surface on the viewing angle side of the liquid crystal display element.