JPS59212876A - Display - 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 The present invention relates to a display device using a translucent display plate, typified by a transmissive liquid crystal display element, a translucent printed matter, and the like.

Conventionally, as this type of device, the one shown in FIG. 1 and the one shown in FIG.
There was something shown in the figure. In FIG. 1, 1 is a translucent display plate made of a transmissive liquid crystal display element, 2 is a light source such as a fluorescent lamp, 3 is a light guide plate made of transparent plastic, and 3a is a light scattering and reflective layer made of white paint printing etc. It is.

In the above device, a part of the light emitted from the light source 2 is transmitted to the light guide plate 3.
The light enters the edge of the body and moves forward while being totally reflected inside. During this process, some of the components that have reached the light scattering and reflective layer 3a no longer satisfy the conditions for total reflection and are emitted toward the light-transmitting display panel 1. As a result, back illumination of the translucent display panel 1 is achieved.

However, the above device has a drawback in that the light source 2 is disposed at one end of the light guide plate 3, resulting in uneven brightness. For this reason, some devices have distributed the scattering properties of the light scattering and reflective layer 3a to reduce unevenness in brightness, but even in this case, the end face of the light guide plate 3 cannot be made large, so the light source 2
Much of the light emitted from the light guide plate 3 was scattered in directions other than the light guide plate 3, resulting in an extremely poor overall light utilization efficiency.

In addition, in FIG. 2, 2 is a light source such as a cold polar discharge tube, and 5 is a light source such as a cold polar discharge tube.
5a is a light reflecting plate made of an aluminum plate with a concave curved surface, and 5a is a light scattering and transmitting plate such as a milky white acrylic plate.

In the above configuration, most of the light emitted from the light source 2 reaches the light scattering plate 5a either directly or after being reflected by the light reflecting plate 5. Most of this light passes through the light scattering and transmitting plate 5a and is scattered and emitted toward the translucent display plate 1. As a result, back illumination of the light-shielding display panel 4 is achieved.

The conventional device shown in FIG. 2 is superior in that most of the light emitted from the light source 2 is reflected directly or by the light reflecting plate 5 and collected on the light scattering and transmitting plate 5a. In order to make the light output intensity distribution uniform in the direction or to avoid the light source 2 being directly visible and causing uneven brightness with the trenched cargo storage, the light scattering and transmitting plate 5a having a sufficiently strong light scattering property is shielded from light. It is necessary to provide the light source between the gender display plate 1 and the light source 2, and as a result, the light utilization efficiency is poor as it is intended to be viewed only from a particular direction.

The present invention has been made in order to eliminate the above-mentioned conventional drawbacks, and aims to align a wide-light display board, a light reflection board, and a light source with the direction of the eye range (the range where the eyes of the person viewing the display are normally located). A related object of the present invention is to provide a display device using a translucent display plate that provides high brightness and uniform illumination by arranging it in a specific positional relationship.

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 3, 1 is a translucent display plate made of a transmissive liquid crystal display element, 2 is a rod-shaped light source such as a cold cathode discharge tube or a fluorescent lamp, and 2a is provided to cover the light source 2.
A light source auxiliary means made of a mirror aluminum plate shaped into a small toy.
6 is a light reflecting plate formed into a toy shape from a mirrored aluminum plate, etc.;
is Eyrenz.

In the above configuration, the cross-sectional shape of the light reflecting plate 6 resembles a part of an ellipse, and the light source 2 and the eye lenses 4 are respectively disposed at or near the focal point of the ellipse. The translucent display board 1 has an effective display area e that is connected to the light reflector 6 and the eye lens 4.
It is arranged at such a position that only the component reflected by the light reflecting plate 6 passes through the effective display area e and reaches the eye lenses 4. In other words, the light that leaves the light source 2 and goes directly to the eye lens 4 is absorbed or reflected by a part other than the effective display area e of the translucent display panel 1 or a separately provided mask body, and reaches the eye lens 4 directly. The translucent display plate 1, the light reflecting plate 6, and the light source 2 are arranged so as to prevent the display from occurring.

If the light source auxiliary means 2a is near the eye range 4, the light source 2f is located at a position surrounded by the light reflector 6 and opened in the direction of the light reflector 6 so that the light reflected by the light reflector 3 reaches positions other than the eye range 4. It is located in

In the above device, most of the light emitted from the light source 2 is reflected by the light reflecting plate 6 and reaches the light-shielding display plate 1.

Of this light, that which is incident on the effective display area e passes through the translucent display plate 1'f and reaches the eye range 4. the result,
Back lighting of the translucent display panel 1 is achieved.

Of the light directed from the light source 2 in a direction other than the light reflecting plate 6, the light directed toward the eye range 4 is reflected in the effective display area e of the light-shielding display board 1.
The light is absorbed or reflected in other areas, or reflected by a part of the light source auxiliary member 2a. Therefore, when viewing the display device from the eye lens 4, the light source 2 is not directly visible and dazzling.

After all, in this display device, when viewed from the eye lens 4, the reflected image of the light source 2 by the light reflecting plate 6 is visible in the background of the effective display area e of the translucent display plate 1.

In the above embodiment, a rod-shaped light source 2 is used, but it may be spherical or planar.

Further, the cross-sectional shape of the light reflecting plate 6 is not limited to an elliptical shape, but may be a parabolic nine-circle shape, a broken line shape, or a rotating surface thereof, and in short, a concave curved shape is sufficient. Although the light source auxiliary means 2a is not necessarily necessary, it is useful for widening the viewing angle, and may be a reflector, a lens, a prism, or the like having the same shape as the light reflecting plate 6. The light-transmitting display board 1 may be a light-shielding printed matter or the like.

Further, a plurality of such display devices may be combined, and a lamp or a lamp and a liquid crystal display element may be blinked in conjunction to provide various display functions. Further, in any part of the optical path from the light source 2 to the translucent display plate 1, for example, a sheet having a slight light scattering property or a transparent ink printed sheet may be placed over the translucent display plate 1, or A slight light scattering property is imparted to the reflector plate 6 by adding a hairline or a squeeze or coating it with transparent lacquer.
It is also possible to slightly widen the light emission angle.

As described above, the present invention includes a light source, a concave light reflection plate, and a translucent display plate, and the light from the light source disposed behind the translucent display plate when viewed from the eye range is reflected. The light reflecting plate is arranged so that the light is reflected by the plate, passes through the display area of the optically active display plate, and reaches the eye lens, so the reflected image of the light source is reflected from the eye range behind the effective display area of the translucent display plate. This achieves backlighting that is equivalent to the luminance of a fluorescent lamp or cold cathode discharge tube multiplied by the reflectance of the light reflector, and has a much higher level of brightness than conventional backlighting. is achieved. Furthermore, since the reflected image of the light source is used as the illumination light source, the illumination brightness is naturally extremely uniform when viewed from the eye lens. In the end, according to the present invention, a display device with high overall light utilization efficiency can be realized.

[Brief explanation of the drawing]

FIGS. 1 and 2 are block diagrams of conventional devices, respectively, and FIG. 3 is a block diagram of the device of the present invention. l... Transmissive display plate, 2... Light source, 2a... Light source auxiliary means, 4... Eye, Shi/So, 6... Light reflecting plate,
e...Effective display area. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Masuo Oiwa

Claims (1)

[Claims] (1) Equipped with a translucent display board, a concave light reflector, and a light source, the light from the light source placed behind the translucent display board when viewed from the eye range is reflected by the light reflector. A display device characterized in that a trap light reflecting plate is arranged so as to pass through the display area of a translucent display plate and reach an eye range.