JPS60238888A - Liquid crystal display unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a liquid crystal display device, and particularly to an improvement in a reflection method of a transmissive liquid crystal display device.

[Prior art]

Conventional liquid crystal display devices have a structure in which the transmissive display image of a transmissive liquid crystal panel is reflected on a mirror surface to view the reflected display image, as in #f patent application No. 50-16098. It was said that the contrast would be improved and the displayed image would be easier to see, but in reality, as shown in Figure 1, the reflected light 7 from the face of the user 4 passes through the reflector 2 and becomes the polarized light of the liquid crystal panel 1. There is a problem in that the reflected image of the user 40 is reflected by the plate or glass and is reflected on the reflecting mirror 2, making it difficult to see the displayed image. In particular, when the external light entering the liquid crystal panel 1 is weak or the external light on the user 4 side is strong, the influence of the reflected light becomes large, and the liquid crystal display image and the reflected image overlap, resulting in an extremely difficult to see image. turn into.

Furthermore, in conventional transmissive liquid crystal display devices, when used in conditions where strong external light 755 enters from directly above, the external light is reflected on the reflector and the necessary liquid crystal display image is dwarfed by the external light, resulting in a decrease in contrast. There were restrictions on the angle at which outside light could enter, and the display image could peel off depending on where it was used, making it difficult to see the displayed image.

Since the conventional reflective samurai uses a cast glass surface, if there is a fingerprint on the glass surface, it will be very noticeable, and the displayed image will also be affected by fingerprints and dirt.
o [Purpose] The present invention is intended to solve this problem, and its purpose is to completely prevent the reduction in contrast of displayed images caused by reflection of external light and reflected images of liquid crystal display devices, and to reduce the Our goal is to provide a display device that can display a clear image without any brightness and can also enlarge or reduce the displayed image.

〔overview〕

The liquid crystal display device N of the present invention has a step-like cross-section that resembles a folded slanted sheet metal on a reflective plate in order to have anisotropic reflection characteristics, and the reflective plate expands the display area. Alternatively, it is characterized by being reduced in size and the display part is made smaller.

〔Example〕 Hereinafter, the present invention will be described in detail based on examples.

FIG. 2 is an embodiment of the present invention. 1 is a transmissive liquid crystal panel, 3 is a diffuser plate, 4 is a user (viewer), 5 is external light, 6
shows a reflector according to the present invention. The external light 5 passes through the transmission type liquid crystal panel 1 through a diffusion plate 3 made of ground glass with a light scattering phase, or organic glass with a roughened surface, etc.
It is reflected by the reflector O and is guided to the user 4. However, the display image of the liquid crystal display device projected on the user 40''i reflection plate 6 will be completely illuminated.Here, as shown in FIG. The reflector is structured to have a step-like cross section, and the characteristic of this reflector is that in normal reflection, reflection occurs so that the angle of incidence and the angle of reflection are the same, but this reflector has anisotropic reflection characteristics. ,
In other words, the incident light has the property of being reflected in the direction of the next day,
The angles of incidence and reflection with respect to the surfacing soil and the reflector are awe-inspiring. This reflective plate (RJ, Metagrill, etc.) is made of organic glass or inorganic glass, an example of which is Fresnel glass.

FIG. 3 shows the optical path of reflected light 7 emitted from the vicinity of the user's face in the liquid crystal display device according to the invention.

In Fig. 1, the image of the user's face was reflected by the liquid crystal panel on the reflector, but according to Fig. 6, the direction of the apparent surface reflected light on the reflector changes, so the image of the user's face is reflected. The light reflected by the plate is 1. Although the light passes through or is reflected by the liquid crystal panel 1, the reflected light is reflected in a different direction, so that the reflected image of the user 4 is not reflected on the reflector plate 6. This eliminates the background and reflected images of the user, which were problems in the past.
A clear display with high contrast can be obtained.

As shown in Figure 4, when there is a strong light source that enters from the sky or directly above, the reflected light is reflected by the reflector plate 6 to the side opposite to the user and is not reflected directly above, so conventional external light This prevents the problem of display images, and allows you to always see a clear display image without being affected by surrounding conditions.

Furthermore, the entire surface of the reflector is shaped to have a step slope at a certain angle so that the display image is magnified and reflected at a certain magnification, so that even if the size of the liquid crystal panel is small, The use of this reflector is economically very valuable because a large display image can be viewed and the smaller the liquid crystal panel, the lower the manufacturing cost. Conversely, by configuring and arranging the entire surface of the reflector so that the displayed image is small, the displayed image becomes small, the brightness increases, and a display with high contrast can be obtained.

FIG. 5 shows an example of a foil for a magnifying reflector. After the light 8 incident on the reflection plate 6 is reflected in a direction that does not follow the optical law, the width d of the incident light 8 is expanded and the reflected light 9 has a width υ. In the case of reduction, the displayed image can be reduced by arranging the reflecting plates left and right inverted.

In this way, depending on the surface shape and arrangement method of the reflector,
It can be enlarged, reduced and reflected.

With conventional reflective surfaces, the displayed image is very difficult to see if fingerprints or dirt get on it, but the surface of this reflector is stepped, so even if there are fingerprints or dirt on it, the displayed image is difficult to see. It doesn't bother me that much because the reflection direction is different, and the displayed image is blurry.

An example of such a transmissive liquid crystal panel is a twisted nematic type liquid crystal, and other liquid crystals can be used in the same manner.

The present invention is effective regardless of the housing structure that houses the folded liquid crystal panel and the reflector, whether it is a two-piece structure, a one-piece structure, or a three-piece structure.

〔effect〕

As described above, according to the present invention, reflection of external light and reflected images can be prevented, high contrast and sufficient brightness can be ensured, and the display image can be enlarged or reduced to achieve a compact and optimal size. It has excellent effects in terms of economy, quality, and design, such as being able to see the displayed image.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a conventional liquid crystal display device. FIG. 2 is a sectional view showing an embodiment of the liquid crystal display device of the present invention. FIG. 6 shows an example in which the reflected image optical path of the user in the brush 2 is not shown, and FIG. 4 shows an example in which the reflected optical path due to external light in FIG. 2 is completely shown. FIG. 5 shows an embodiment of a magnifying reflector according to the present invention. 1...Liquid crystal panel 2...Reflector 6...Diffusion plate 4...User 5...Outside light 6...Reflector 7...Reflected light from user 8...Incidence Light 9...Reflected light 10...More than normal reflected light\Applicant Suwa Seikosha Co., Ltd. Agent Patent Attorney Tsutomu Mogami-111 "[I JIL 1) F"]

Claims (2)

[Claims] (1) In a liquid crystal display device in which a transmissive display image of a transmissive liquid crystal panel is reflected by a reflector to display a reflected display image, a swash plate is provided on a flat plate so that the surface of the reflector has anisotropic reflection characteristics. A liquid crystal display device characterized by having a folded-like step-like cross section, and displaying a transmissive display image of the transmissive liquid crystal panel on the reflecting plate. (2) The gold surface of the reflector plate is formed into a sloped staircase shape that magnifies or reduces incident light at a certain magnification and reflects it, and by placing one at a predetermined position, the transmissive display image can be magnified. 2. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is displayed in a reduced size.