JPS6012150Y2 - display device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a new display device, and more specifically, a transparent light guide plate is arranged on the back side of a display board having a light-transmitting display element, and light from a light source is once inside the light guide plate. In a display device that introduces light into the display panel and emits this light toward the display board to make the display elements shine, it is possible to use the light effectively easily and inexpensively, and to prevent scratches on the back side of the display board. The purpose of this invention is to provide a new display device that prevents this.

An example of a conventional display device is shown in FIGS. 1 to 3.

A is a case body, and a small light bulb serving as a light source is attached to an appropriate place on the case body.

C is a light guide plate made of a transparent synthetic resin plate, and the light guide plate C is housed in the case body a.

A hole d is formed in the light guide plate C, and the light emitting part of the small light bulb is inserted into the hole d, so that the light from the light bulb is introduced into the light guide plate C from the inner surface of the hole d. It looks like this.

e is a display board on which display elements f, f, . . . such as light-transmissive characters and symbols are formed.

The display elements f, f, ... are formed on the display panel e by forming the display elements f, f, ... on the back surface of the transparent substrate g.
This is done by forming a light-shielding film except for the areas where...

Such a display panel e is attached to the case body a so as to overlap the front surface of the light guide plate C.

In the conventional display device described above, the light-shielding film h1, for example, a black or other dark-colored film is formed on the back surface of the display panel e, so that the light emitted from the light guide plate C toward the display panel e is blocked. Much of the light is absorbed by this light-shielding film, and much of the light introduced into the light guide plate C is absorbed by the display elements f, f...
It becomes useless and useless to Kouki.

Therefore, in order to make the display elements f, f, .

Further, if there is a gap between the case body a1, the light guide plate C, and the display panel e, when this is mounted on a car or the like, abnormal noise will be generated due to running vibrations, so they are arranged closely together.

However, the light guide plate C is shaped by molding, and the edges generated at that time may not be completely removed, or due to the shape, sharp corners may be formed on the side facing the display panel e. If the display panel e and the light guide plate C are placed in close contact with each other, the light-shielding film on the back of the display panel e may be damaged by the above-mentioned edges or corners. There was also the inconvenience that light leakage occurred.

This invention was developed in consideration of the above points,
The purpose is to provide a new display device that can effectively use the light from the light source to make the display elements shine, and also prevents the display board from being scratched. A case body holds a transparent light guide plate that faces each other and emits light introduced into the wall thickness from the end face forward, and a display plate that is disposed in front of the light guide plate and has a light-transmitting display element. A light-reflecting sheet is interposed between the light guide plate and the display plate, and at least a part of the display element of the light-reflecting sheet, particularly a portion corresponding to a display element located far from the light source, is provided. is characterized by the formation of a cutout window.

The details of the display device of the present invention will be explained below according to the illustrated embodiments.

In the figure, reference numeral 1 denotes a case body, and a small light bulb 3 for a light source is attached to an appropriate location of the case body 1 via a socket 2.

4 is a light guide plate made of transparent synthetic resin, which is attached to the case body 1;
stored inside.

A circular hole 5 is formed in the light guide plate 4 at a location corresponding to the light bulb 3, and when the light guide plate 4 is housed in the case body 1, the light bulb 3 attached to the case body 1 is inserted into the hole 5. It is designed to be inserted inside.

Thus, the light from the light bulb 3 is introduced into the light guide plate 4 from the inner surface of the hole 5.

Reference numeral 6 denotes a display plate attached to the case body 1 so as to cover the front side of the light guide plate 4.

The display board 6 has a light-shielding film 9 formed on the back side of a transparent substrate 7, except for the areas where display elements 8, 8, etc. such as characters and symbols are to be formed. Display element 8
, 8°... is formed and admonishes.

10.10... are conical stipples formed on the back surface of the light guide plate 4, and the light introduced into the light guide plate 4 and traveling through its thickness is reflected by these stipples 10, 10°・・・・・・
is reflected and emitted toward the display panel 6.

Therefore, such stipples 10, 10 . . . . are display elements 8, 8, . . . on the back side of the light guide plate 4. It is formed at the location corresponding to...

Reference numeral 11 denotes a light reflective sheet interposed between the front surface of the light guide plate 4 and the back surface of the display panel 6, and in this embodiment, a white sheet made of synthetic resin is used.

This light reflective sheet 11 is formed to a size that covers almost the entire surface of the light guide plate 4, and also has display elements 8, 8, . A cutout window 12 is formed at a position corresponding to .

In addition, if the brightness of a display element located close to the light source 3 is significantly brighter than the brightness of other display elements, a cutout window should not be provided in a location corresponding to such a display element. For example, since light is attenuated by the sheet 11, non-uniformity in brightness between the display elements and other display elements can be corrected.

13 is another light reflective sheet, which is interposed between the inner surface of the case body 1 and the back surface of the light guide plate 4.

Note that one end portion 14 of the display plate 6 is formed into a wedge shape, and the wedge portion 14 is connected to a groove 15 formed on the inner surface of the opening of the case body 1.
is engaged with.

In the display device as described above, out of the light introduced into the light guide plate 4, the light that attempts to exit to the front side of the light guide plate 4 is
Display elements 8, 8. . . . In areas where there is no . It is returned into the light plate 4.

Furthermore, since the sheet 11 is interposed between the display panel 6 and the light guide plate 4 and functions as a cushioning material, there is no fear that the light guide plate 4 will be damaged by edges or corners left on the light guide plate 4.

As is clear from the above description, in the display device of the present invention, a light reflective sheet is interposed between the light guide plate and the display plate, so that the light introduced into the light guide plate is transmitted throughout the light guide plate without waste. The light from the light source can be used effectively, and the back surface of the display board can be prevented from being damaged by the light guide plate or the like.

[Brief explanation of the drawing]

1 to 3 show an example of a conventional display device.
The figure is a partial front view, Figure 2 is a sectional view taken along the line ■-n in Figure 1, Figure 3 is a partially cutaway enlarged perspective view showing the main parts of the display board, and Figures 4 to 6. 4 shows an example of the implementation of the display device of the present invention, FIG. 4 is a front view, FIG. 5 is a sectional view taken along the line ■-■ in FIG. 4, and FIG. 6 is a partially cutaway view of the main part. Enlarged perspective view. Explanation of symbols, 1...Case body, 3...
Light source, 4...Light guiding plate, 5... Portion where an end face for introducing light is formed, 6... Display plate, 8
... Display element, 11 ... Light reflective sheet, 12 ... Notch window, 13 ... Light reflective sheet.

Claims (3)

[Scope of utility model registration request] (1) A transparent light guide plate with a part of the end face facing the light source and emitting the light introduced into the wall thickness from the end face forward, and a light-transmitting display element arranged in front of the light guide plate. A display board is held in a case body, a light reflective sheet is interposed between the light guide plate and the display board, and at least a part of the display element of the light reflective sheet is located far from the light source. A display device characterized in that a cutout window is formed at a location corresponding to a display element at a position. (2) The display device according to claim 1, wherein the light reflective sheet is a white sheet made of synthetic resin. (3) Utility model registration claim 1 characterized in that a light reflective sheet is also interposed between the case body and the light guide plate.
The display device according to item 1 or 2.