JPS6095516A - Liquid-crystal display element - Google Patents

Abstract

PURPOSE:To utilize both external light and internal light efficiently by placing a reflecting plate which slides between an LCD panel and a reverse-surface light source. CONSTITUTION:The reflecting plate 5 slides into and out of the space between the LCD panel 1 and a driver board 3 while both ends are guided by slide guide plates 4. Thus, the reflecting plate is inserted into below the panel and drawn out according to the outside lightness to obtain the best picture quality with good contrast at any time. Further, there is no restriction of the surface finish of the reflecting plate and the surface is finished to the best reflection efficienccy, thereby improving the picture quality greatly.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a liquid crystal display element that can display images by utilizing the reflection of light from the outside. Regarding the attached liquid crystal display element.

Recently, displays using liquid crystal display panels (hereinafter referred to as LCD panels) have become commonplace, and their use has increased from simply displaying numbers and graphics to displaying even shading, like television pictures. Along with this, there is an increasing demand for using the characteristics of liquid crystals to provide clear display not only in bright conditions, but also in dim light or at night without external lighting. For this reason, it has become common to provide a backside light source as auxiliary illumination on the backside of the LOD panel for display purposes.

FIG. 6 is a conceptual diagram of a general liquid crystal display element using a conventional backside light source. In the figure, 20 is an OD panel, and 26 is a printed circuit board. Both are pressed and electrically connected via conductive rubber 23 and panel holder 21 and panel holder screw 22. On the back of the 20 LOD panel, a 25 back light source is located, and a 24 semi-transmissive reflector is inserted between the two. A semi-transparent reflector has the property of both reflecting light and transmitting light. The display can be viewed at any time by reflecting external light during the day with this 24 semi-transparent reflector and transmitting light emitted from the back light source at night. However, traditional methods have several drawbacks. One of the major drawbacks is that the transmissive reflector makes it seem like the display can be seen both day and night, but it is actually semi-transparent, so if the reflector's light transmittance is, say, 50%, outside light Only 50% of the light is reflected, and only 50% of the light from the internal backside light source is transmitted. As a result, the amount of light decreases, making it impossible to see a clear and sharp display.

For these reasons, the current situation is that the day is sacrificing the night in favor of one or the other. or,
Another disadvantage is that the semi-transmissive reflector is difficult to manufacture, resulting in high cost and a corresponding increase in product price. In addition, the reflector plate is necessary to make the display clear, so
The surface must have as fine particles as possible, but in a semi-transmissive reflector, small holes or transparent parts are provided to allow light to pass through, so the reflective surface does not have fine particles. Obtaining a clear screen becomes difficult.

The present invention eliminates such drawbacks and places a sliding reflector between the LOD panel and the back light source to efficiently utilize both external light and internal light.

The present invention differs from the conventional art in that a reflective plate is provided between the LOD panel and the back light source, and that a slide knob that interlocks with the reflective plate is provided.

FIG. 1 is a conceptual diagram of an embodiment of the present invention. In the figure, 1 is the LOD panel, 2 is the conductive rubber,
It is electrically connected to the driver board for driving the LCD in No. 3. A back light source 6 is located between the LOD panel 1 and the driver board 3.
A reflecting plate 5 is located between them. The reflective plate 5 is guided at both ends by the slide guide plate 4, and slides in and out between the LOD panel 1 and the driver board 3. In this embodiment, the slide guide plate 4 also serves as the second conductive rubber guide frame and is made of the same material.

FIG. 2 is a conceptual diagram of the present invention seen from above. In this embodiment, three driver boards are fixed to the case with ten driver board fixing screws. The reflective plate 5 has its insertion side and reflective side ends fixed by a reflective plate fixing plate 11, and is connected to a reflective plate slide knob 9.

The reflector slide knob 9 protrudes from the case to the outside, and by sliding the reflector slide knob on the case, the reflector 5 is inserted under the LOD panel 1 or pulled out.

As described above, according to the present invention, the following advantages arise by inserting or pulling out the reflector under the panel depending on the external brightness.

1. By sliding the reflector according to the outside brightness, you can always get the best image quality with good contrast.

2. There are no restrictions on the surface finish of the reflector, and the surface finish can have the best reflection efficiency, greatly contributing to the improvement of image quality.

5. Because there is no need to make small holes in the reflector as in the past,
Manufacturing becomes easier and product costs can be reduced.

In the present invention, the conductive rubber 2 is used for electrical connection between the LOD panel 1 and the driver board 3, and the slide frame 4 also serves as a guide frame for the conductive rubber 2, but the present invention is not limited to this. There is no problem even when flexible tape is used as a conduction method between the LOD panel 1 and the driver board 3. The slide guide frame 4 can be used only for sliding the reflector, and this method has the advantage of further simplifying the structure.

Further, in the present invention, a back light source is used to emit internal light, but if this is difficult, a light emitting source such as a fluorescent lamp may also be used. In this case, a light guide plate is required to use the light from the fluorescent lamp as a backside light source, but one reflecting plate can also serve as a light guide plate, simplifying the structure. And the light...
Since transmission loss is also reduced, the benefits of using light more effectively and making each screen brighter and clearer increase. In addition, with this invention, a switch is provided that works with the sliding reflector,
By turning on and off the power to the back light source, you can turn off the power to the back light source when the reflector is reflecting external light, making effective use of power and extending the product's battery life. Become. Advantages such as a longer life of the backside light source arise.

As described above, in the present invention, by providing a sliding reflecting plate and sliding it, it is possible to provide images of good quality that are easy to see, have high contrast, and are easy to see, regardless of the time, day or night.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram of an embodiment of the present invention seen from a cross section, FIG. 2 is a conceptual diagram of a plan view, and FIG. 3 is a conceptual diagram of a conventional general display element. 1... LOD panel 2... Conductive comb 6... Driver board 4...
...Slide guide plate 5...Reflector 6...Reverse light source 9...Reflector slide knob (7)

Claims (1)

[Claims] A liquid crystal display element characterized in that a reflective plate is placed between a liquid crystal display panel and a back light source for internal illumination of the liquid crystal display panel, and a knob that interlocks with the reflective plate is provided so that the reflective plate slides.