JPS6323732Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lighting device for a liquid crystal display that can improve lighting efficiency.

A conventional lighting device of this kind for a liquid crystal display is as shown in FIG. That is, 1 is a substrate, and 2 is an illumination filter attached to the substrate 1, forming a U-shape. A reflecting plate 3 is installed on the back surface of the illumination filter 2. Reference numeral 4 denotes a liquid crystal display panel, which is arranged in front of the illumination filter 2 and housed in the holder 5. Reference numeral 5a denotes a display window of the holder 5, which is used to display the display contents from the liquid crystal display panel 4 to the outside.

In the figure, reference numeral 6 denotes a light source, which is placed behind the substrate 1.

According to this configuration, the reflective plate 3 is placed at a position separated from the liquid crystal display panel 4, and the displayed content appears to be floating, making it difficult to clearly see it.

Furthermore, the number of man-hours required to assemble the reflector 3 increased, resulting in an increase in product price. In addition, there were various problems such as the lighting means being limited to edge lights and the like.

The present invention has been devised to solve these problems, and its purpose is to provide a new LCD display lighting device that does not require a reflector, has a compact structure, and allows the displayed content to be clearly seen.

Hereinafter, an embodiment of the lighting device for a liquid crystal display according to the present invention shown in FIG. 2 will be described in detail.

Reference numeral 1 denotes a substrate, which has a central incident light hole 1a and outer incident light holes 1b and 1c for passing incident light. The central incident light hole 1 a is formed in the center of the substrate 1 . The outer incident light holes 1b and 1c are formed around the central light hole 1a. Reference numeral 7 designates an illumination filter, the front and back surfaces of which are formed with a satin finish or a printed finish, for example.

Further, the illumination filter 7 is formed in a trapezoidal shape and closes the central incident light hole 1a and the outer incident light holes 1b and 1c of the substrate 1 from the upper surface. The illumination filter 7 has reflective surfaces 7a and 7b formed around its periphery, and the reflective surfaces 7a and 7b are arranged above the outer entrance holes 1b and 1c of the substrate 1. A liquid crystal display panel 4 is disposed on the front surface of the illumination filter 7, and the liquid crystal display panel 4 is held between the inner wall 5b of the holder 5 made of an opaque material and the front surface of the illumination filter 7. Reference numeral 6 denotes a light source, which is disposed at the lower center of the central incident light hole 1a of the substrate 1.

Next, the action will be explained.

The incident light emitted from the light source 6 is directed from the arrow A to the substrate 1.
The light is introduced through the outer incident light hole 1c, is reflected by the reflecting surface 7a of the illumination filter 7 as shown by the arrow (b), and reaches the liquid crystal display panel 4 as shown by the arrow (c). Further, the incident light from the light source 6 reaches the liquid crystal display panel 4 as shown by arrow D via the center incident light hole 1a of the substrate 1 and the illumination filter 7 as shown by arrow D. Further, the incident light from the light source 6 is introduced from the arrow H through the outer incident light hole 1b of the substrate 1, and is reflected by the reflection surface 7b of the illumination filter 7 as shown in the arrow, and is reflected on the liquid crystal display panel as shown in the arrow G. Reach 4.

The incident light from the light source 6 is irradiated over the entire surface of the liquid crystal display panel 4 as shown by arrows C, D and G, and the display contents are displayed externally through the display window 5a of the holder 5.

As described above, since the liquid crystal display lighting device according to the present invention does not include a reflector, the structure is simple and the number of assembly steps can be reduced. It also contributes to cost reduction and mass production. Furthermore, the incident light from the light source can be evenly irradiated onto the liquid crystal display panel 4, which has various effects such as clarifying the display contents and expanding the illumination means.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of a conventional lighting device for a liquid crystal display. FIG. 2 is a sectional view showing an embodiment of a lighting device for a liquid crystal display according to the present invention. 1...Substrate, 1a...Central incident light hole, 1b, 1
c...Outer incident light hole, 4...Liquid crystal display panel, 5
...Holder, 5a...Display window, 6...Light source, 7
....Illumination filter, 7a, 7b...reflection surface.

Claims (1)

[Scope of utility model registration request] A substrate provided with a central incident light hole for introducing incident light from a light source and an outer incident light hole formed around the central incident light hole; an illumination filter that closes a central incident light hole and an outer incident light hole and forms a reflective surface on the upper part of the outer incident light hole; a liquid crystal display panel installed in front of the illumination filter; 1. A lighting device for a liquid crystal display, comprising a holder that holds a liquid crystal display panel and has a display window for displaying display contents.