JPS62229278A - 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] Industrial applications The present invention relates to a display device having a liquid crystal display panel.

Prior Art Conventionally, as shown in FIGS. 6 and 7, a reflective surface 1 is provided on the inner surface.
A frame body 4 is provided, which has two reflecting plates 2 facing each other and a support plate 3 facing each other in a direction orthogonal to the direction in which these reflecting plates 2 face each other. A liquid crystal display panel 9 is formed by forming an opening surface 6 facing the , and having a large number of liquid crystal display elements 8 arranged in a matrix on the front surface of a diffuser plate 7.
is placed on the front surface of the frame body 4, and the circuit component 1 is placed on the outer surface of the reflector plate 2.
There is a display device in which 0's are arranged.

Problems to be Solved by the Invention However, since the light source 5 located outside the width of the aperture surface 6 has a high rate of irradiating light outside the range of the aperture surface 6, the brightness of the liquid crystal display panel 9 decreases. Power consumption increases accordingly.

This tendency is particularly strong when the area of the opening surface 6 is made smaller than the area of the liquid crystal display board 9 in order to position the circuit component 1o within the projected area of the liquid crystal display board 9.

The present invention has been made in view of the above points, and an object of the present invention is to provide a display device that can increase the brightness of a liquid crystal display panel without increasing power consumption.

Means for Solving the Problems A frame body having a reflective surface formed on the inner surface and opposing reflecting plates is provided, an opening face facing the light source is formed on the back side of the frame body, and a In a device equipped with a liquid crystal display panel, a rear reflector plate facing a light source is provided at the edge of the opening surface of the frame body.

Therefore, the light rays emitted by the light source that are outside the projected area of the aperture surface are reflected by the rear reflector, and the reflected light rays are again reflected from the surface of the light source into the aperture surface, thereby increasing the brightness of the liquid crystal display panel.

Embodiment A first embodiment of the present invention will be explained based on FIGS. 1 and 2. Components that are the same as those described in FIGS. 6 and 7 are designated by the same reference numerals, and description thereof will be omitted (the same applies hereinafter). A plurality of straight tube type lights i5 are arranged in parallel in the horizontal direction on the back surface of the plurality of stacked frames 4. A rear reflector plate 10 is fixed to the edge of the opening surface 6 of the frame body 4. These reflecting plates 10 are inclined toward the light source 5 located within the projection plane of the aperture surface 6.

In such a configuration, the light source 5 irradiates a light beam into the aperture surface 6 as the light source 5 is located inside the projection plane of the aperture surface 6, and the light source 5 irradiates the light beam outside the aperture surface 6 as the light source 5 is located outside. However, the light beam irradiated outside the aperture surface 6 is reflected by the rear reflector 10, and this reflected light beam is reflected back onto the aperture surface 6 by the surface of the light source 5.
reflected inward. The light rays thus irradiated into the aperture surface 6 are irradiated directly onto the diffuser plate 7, or are reflected by the reflective surface 1 and irradiated onto the diffuser plate 7.

Therefore, the light rays from the light source 6 can be used efficiently and the brightness of the liquid crystal display panel 9 can be increased without increasing power consumption.

Incidentally, the brightness of the liquid crystal display panel 9 was measured at a plurality of locations, and if the brightness without the rear reflector 1o is set to 1, the brightness was 1.15 times higher on average. Table 1 shows the breakdown.

Note that although the rear reflector 10 is inclined toward the inner band of the projection plane of the aperture surface 6, when the straight tube type light sources 5 are arranged horizontally in parallel, the rear reflector plate 10 is inclined toward the inner band of the projection plane of the aperture surface 6, but as shown in FIG. The rear reflector 11 may be provided within an extension of the parallel planes. Even in this case, the light rays emitted from the light source 6 facing the rear reflector 11 are diffused, so the light rays emitted from the light #5 are reflected on the rear reflector 11.
1 is reflected with a reflection angle corresponding to the incident angle. Since the light source 5 has a curved surface when viewed from the side, it reflects the reflected light from the rear reflector 11 toward the inside of the aperture 6 with a reflection angle corresponding to the incident angle.

Next, a second embodiment of the present invention will be described based on FIGS. 4 and 5. In this embodiment, a plurality of straight tube type light sources 5 are arranged vertically and parallel to each other on the back side of the frame body 4, and the shape of the rear reflector plate 12 is as shown in FIG. 4 when viewed from the side. It is tilted in a dogleg shape so as to reflect the light rays from the light source 5 in the vertical direction, and when viewed from the vertical direction, as shown in FIG. This is as specified in the following.

Therefore, the reflected light rays emitted from the part of the light source 5 facing the rear reflector 12 are reflected to the part of the light source 5 facing the opening surface 6 when viewed from the side, as shown in FIG. 4, and are reflected from above and below. If you look, the reflected light from the rear reflector 12 is reflected from the light source 5.
The re-reflection effect of the light source 5 can be promoted without directing the light source 5 between the light source 5 and the light source 5.

Effects of the Invention Since the present invention is configured as described above, the light rays emitted by the light source that are outside the projected area of the aperture surface are reflected by the rear reflector, and the reflected light rays are reflected again from the surface of the light source into the aperture surface. , it has the effect of increasing the brightness of the liquid crystal display panel.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional side view showing the first embodiment of this invention;
The figure is a partially enlarged longitudinal side view of the same, FIG. 3 is a partially enlarged longitudinal side view of 5 showing a modified example of the rear reflector, and FIG. 4 is a partially enlarged longitudinal side view of the second embodiment of the present invention. 5 is a partially enlarged plan view thereof, FIG. 6 is an exploded perspective view showing a conventional example, and FIG. 7 is a longitudinal side view thereof. 1...Reflecting surface, 2...Reflecting plate, 4...Frame body, 5...
...Light source, 6...Aperture surface, 9...Liquid crystal display board, 10~
12... Rear reflector plate applicant Toshiba Electric Materials Corporation -11---゛111
, Agent Akira Aiki,...-1, Akane:? ,
-13. 1 Figure 32

Claims (1)

[Claims] A frame body having a reflective surface formed on the inner surface and opposing reflective plates is provided, an opening face opening toward the light source is formed on the back surface of the frame body, and a liquid crystal display panel is disposed on the front surface of the frame body. A display device, characterized in that a rear reflector plate facing the light source is provided at an edge of the opening surface of the frame body.