JPS5829500Y2 - display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a display device, and more particularly, it is an object of the present invention to provide a novel display device that has no uneven display brightness between characters, symbols, etc. given to the display device.

Light-transmitting characters, symbols, etc. are printed on the front side of the transparent light guide plate, whose end face partially faces the light source and reflects the light incident from the light source toward the front side at the stippled reflection section formed on the back side. There is a display device with a display body arranged, but if the display body is disposed over a wide area, or if the display body is disposed over a long range in one direction, it may be necessary to place the display body far from the light source □. The brightness of a certain display body becomes lower than that of a display body located closer to the light source, resulting in poor visibility.

In order to solve this problem, the formation density of the stippled reflective parts corresponding to the display body that is far from the light source is increased to compensate for the decrease in the reaching luminous flux by increasing the reflective surface. If the dots are too close to each other, the dots close to the light source will block the light going to the dots adjacent to the dots immediately opposite the light source, increasing the density of dot reflections within a single light guide plate. There are limits to things.

Therefore, even in a conventional display device in which the formation density of stippled reflective portions increases as the distance from the light source increases, it is difficult to obtain a display with sufficiently balanced display brightness.

Therefore, the present invention aims to eliminate the drawbacks of conventional display devices and provide a new display device in which the entire display is performed with uniform brightness and has extremely good visibility. A transparent light guide plate that reflects light incident from the light source toward the front side with stippled reflection parts formed on the back side, and light-transmitting letters arranged on the front side of the light guide plate,
It consists of a display body such as a symbol, and another light guide plate placed on the back side of the light guide plate, and a part of the other light guide plate has an end face facing the light source, and directs the light incident from the light source to the light guide plate on the front side. The present invention is characterized in that it is equipped with a stipple-like reflecting part that reflects in the direction, and the position of the stipple forming the reflecting part is shifted from the position of the stipple on the front light guide plate.The details of the present invention are described below. The explanation will be given according to the illustrated embodiment.

FIG. 1 shows a first embodiment of the display device of the present invention.

Reference numeral 24 denotes a case with an open front side, and an installation step 25 is formed at the edge of the opening and has a button 4, and the display board 1 is placed and fixed on the step 25.

The display board 1 is provided with, for example, a white diffuse-transmissive film 3 on the front surface of a transparent substrate 2, except for the portions that should become display bodies 41, 42, 43, 44 such as characters and symbols on the diffuse-transparent film 3. For example, a black light-shielding film 5 is applied, and therefore, light-transmitting display bodies 41 to 44 are formed on the display panel 1.

A light bulb mounting portion 26 is formed protruding from the case 24 at a position biased to one side.
0 is attached.

A light guide plate 11 is disposed on the back side of the display board 1, and the light receiving portion 12 of the light guide plate 11 extends at the light bulb attachment portion 261 of the case 24, and its end faces the light bulb 10.

Reference numeral 27 denotes a transparent auxiliary light guide plate disposed on the back side of the main light guide plate 11, one end of which is bent backward to form a light receiving section 28, and the rear end surface of the light receiving section 28 is shaped like a light bulb. It is facing 10.

Further, on the back surface of the main portion 29 of the auxiliary light guide plate 27, which is opposite to the back surface of the main portion 13 of the main light guide plate 11, there is a stippled reflective portion 1 of the main light guide plate 11.
4,14. . . . Similarly, stippled reflection portions 30, 30, . . . are formed at locations corresponding to the formation locations.

Further, an inclined reflective surface 31 is formed outside the connecting portion between the main portion 29 of the light guide plate 27 and the light receiving portion 28 .

Then, the stippled reflection portions 14, 1 formed on the main light plate 11
4. . . . and stippled reflection portions 30, 30 . . . formed on the auxiliary light guide plate 27. ... are arranged so that they do not overlap each other when viewed from the front.

This is schematically shown in FIG. Therefore, in the display device according to the embodiment of FIG. Leading light plate 11
The light is emitted toward the main light guide plate 11 and then passes through the display body 4.

As described above, in the display device of the present invention, since another light guide plate is arranged on the back side of the light guide plate arranged immediately behind the display, the light is reflected by the reflective part of the other light guide plate. The reflected light can be transmitted through the front light guide plate and contribute to the illumination of the display object. Therefore, by moving the button far from the light source to increase the amount of reflected light, it is possible to contribute to the illumination of the display object far from the light source. It becomes possible to make the display brighter, and it is possible to perform display with uniform brightness over the entire display body.

Even if the formation density of the stippled reflection parts increases as the distance from the light source increases, the density can be considered as the sum of the stippled reflection parts formed on the two light guide plates, the main light guide plate and the auxiliary light guide plate. Therefore, it is easy to make the brightness of the entire display body uniform by this density change.

Since the present invention is constructed with an auxiliary light guide plate disposed on the back side of the main light guide plate, the above-mentioned effects can be obtained without increasing the depth of the entire device.

Furthermore, as shown in FIG. 3, when the main light guide plate 11 is formed with an insertion hole 32 for inserting a dial switch or the like, the part of the auxiliary light guide plate 27 far from the light source where the light source can be seen is inclined. A reflective surface 33 is formed, and the light is reflected by this reflective surface 33 to the back side of the insertion hole 32 (the side opposite to the light source).
The reflected light can be reflected forward by the reflecting section 30, and the display object can be illuminated accordingly.

FIG. 4 shows a second embodiment of the display device of the present invention.
Since substantially the same case 24 as that used in the first embodiment is used, these parts will be given the same reference numerals and detailed explanations will be omitted.

17 is a transparent light guide plate arranged to cover the front opening of the case 6, and a display body 181 is mounted on the front surface of the light guide plate 17.
t 182 t 183 are formed.

That is, a diffuse transmission film 19 is provided on the front surface of the light guide plate 17, and a display body 18 □ of characters, symbols, etc. is provided on the diffuse transmission film 19.
A light shielding film 20 is provided except for the portions that should be 183 to 183.

Each display body 181 to 18 on the back surface of this light guide plate 17
A large number of stippled reflection parts 21, 2L...
・The columns are formed so that the distance from the light source increases the density of column formation.

22 is a transparent light guide interposed between the light source bulb 10 and the light guide plate 17, one end face is opposed to the light bulb 10, the side face of the other end is opposed to one end face of the light guide plate 17, and,
The opposite side of the surface facing the light guide plate 17 is an inclined reflective surface 23 .

A transparent auxiliary light guide plate 34 is arranged on the back side of the light guide plate 17 to which the display bodies 181 to 183 are directly attached and arranged to cover the front opening of the case 24, and one end surface of the light guide plate 34 is arranged so as to cover the front opening of the case 24.
It is facing 0.

Further, on the back surface of the auxiliary light guide plate 34, the stippled reflection portions 21, 21 . . . . The stippled reflection portions 35° 35 corresponding to each display body 18 are arranged so as not to overlap with the . . .
are formed in large numbers.

In the display device according to this embodiment, the light from the light bulb 10 enters the light guide 22 without being shunted, and then is reflected by the inclined reflective surface 23 and enters the light guide plate 17.

The light entering the light guide plate 17 is reflected by the stippled reflection parts 21 and 2.
1. It is reflected by ... and passes through IL~183.

Also in this second embodiment, substantially the same effects as in the first embodiment can be achieved.

FIG. 5 shows a third embodiment of the display device of the present invention.
Display board 1 similar to that used in the first embodiment
, a light guide plate 11, and a case 24 are used, and a detailed explanation of these will be omitted.

Furthermore, illustration of the case 24 is omitted.

One end surface of the auxiliary light guide plate 36 disposed on the back side of the light guide plate faces the light source bulb 10, and the light source bulb 10 also faces the light source bulb 10.
The light guide portion 37 is bent forward from the end farthest from the
are integrally formed, and the side surface of the light guide portion 37 is connected to the light guide plate 11.
In addition, inclined reflective surfaces 38 and 39 are formed at the front and rear ends of the light guide section 37, respectively.

Incidentally, stippled reflective parts 40, 40 .
. . . are the stippled reflection parts 14, 142 of the main light plate 11.
Of course, it is formed so that it does not overlap with...

In addition to the effects described in each of the above embodiments, the display device according to this embodiment not only receives light that enters the main light guide plate 11 through the light receiving section 12, but also emits light from the end face of the auxiliary light guide plate 36 that is far from the light source. Since the light that would otherwise have been wasted enters the light guide plate 11 through the inclined reflection surfaces 38 and 39 of the light guide section 37, the light can be used without wastage, making the display brighter. be able to.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional plan view showing the first embodiment of the display device of the present invention, FIG.
The figure is a bottom view of the main parts, FIG. 4 is a cross-sectional plan view showing the second embodiment of the display device of the present invention, and FIG. 5 is the third embodiment of the display device of the present invention.
FIG. Explanation of symbols, 2...Transparent substrate, 4...Display body, 5...Light shielding film, 10...Light source, 11...Light guide plate, 14...Stippling reflection section, 17...Light guide plate, 18... Display body, 20... Light shielding film, 21... Stippled reflection section, 27... Auxiliary light guide plate, 30
... stippled reflection section, 34.. auxiliary light guide plate, 35.. stippled reflection section, 36.. auxiliary light guide plate, 40.. stippled reflection section.

Claims (3)

[Scope of utility model registration request] (1) A transparent light guide plate whose end face partially faces the light source and reflects the light incident from the light source toward the front with stippled reflection parts formed on the back surface, and a transparent light guide plate arranged on the front side of the light guide plate. It consists of a light-transmissive display such as letters, symbols, etc., and another light guide plate placed on the back side of the light guide plate, and the other light guide plate has a part of its end face facing the light source and receives light from the light source. The button is equipped with a stippled reflecting part that reflects the reflected light toward the front light guide plate, and the position of the stipples forming the reflecting part is shifted from the position of the stipples on the front light guide plate. display device. (2) The display device according to claim 1, wherein the display body is formed by applying a light-shielding film to the front surface of the light guide plate except for the portion that should become the display body. (3) The display body is formed by placing a separate transparent plate or transparent sheet on the front side of the light guide plate, and applying a light-shielding film to the transparent plate or transparent sheet except for the part that should become the display body. A display device according to claim 1, characterized in that: