JPH0342457Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a display device using a light-receiving display member such as a transparent plate or a liquid crystal display element, and in particular, a light guide is placed behind the light-receiving display member. The present invention relates to a display device, in which a light guide is provided to form a lighting section through which external light enters, and an internal light source is provided to the light guide to illuminate the light-receiving display member from behind. .

[Conventional technology]

It is well known that a display device using a light-receiving display member such as a liquid crystal display element, which is a transparent plate that does not emit light itself, is used as a vehicle instrument to display various information. Japanese Utility Model Application Publication No. 51-92084 and Japanese Patent Publication No. 56-30217 disclose devices that use external light for illumination when it is bright, and use internal light emitted from an internal light source when it is dark. There are public notices, etc. That is,
A light guide is disposed behind the light-receiving display member, and this light guide is provided with an internal light source and forms an end surface that serves as a lighting section through which external light enters, and this end surface is exposed to the outside, such as the top surface of an instrument. It is also provided facing the windshield so that external light passing through the windshield can easily enter the windshield.

[Problem that the invention attempts to solve]

In such conventional display devices, when the surroundings are dark and the internal light source is turned on, the light emitted from the internal light source that enters the light guide, that is, the internal light, is directed toward the light-receiving display member. As the light travels, some of it is repeatedly reflected inside the light guide and leaks out of the light guide from the end face that is the lighting section, and this leaked light hits the windshield, causing a part of the windshield to shine unnecessarily. There was a problem in that it gave a sense of discomfort to drivers and others.

[Purpose of invention]

This invention focuses on the above-mentioned conventional problems, and aims to provide a display device that can illuminate a light-receiving display member from behind with external light or internal light, and can suppress leakage of internal light to the outside. That is.

[Summary of the idea]

In order to achieve the above object, the present invention includes a light-receiving type display member, and a light guiding body disposed behind the light-receiving type display member and having a lighting section into which external light illuminates the light-receiving type display member. , in a display device comprising an internal light source disposed facing the end face of the light guide and emitting internal light to illuminate the light-receiving display member, the internal light is directed to the outside in a light-collecting portion of the light guide; A filter with transmission characteristics that suppresses transmission is provided.

〔Example〕

1 to 4 show a vehicle display device which is an embodiment of this invention, in which a viewing opening 2 is provided on the front of a case 1, and a mirror surface display is provided inside the viewing opening 2. A portion 3 is arranged at an angle, and a light introduction window 4 is provided above the mirror display portion 3. A liquid crystal display element 5, which is a light-receiving display member, is attached to the light introduction window 4, and a light guide 6 is provided behind the liquid crystal display element 5. A lamp 7 that is an internal light source that emits internal light is provided. Further, the surface of the light guide 6 opposite to the surface facing the liquid crystal display element 5 serves as a lighting section through which external light enters, and faces the outside through the light introduction window 4 of the case 1 and faces the windshield 8. . A drive circuit 9 is connected between the mirror display section 3 and the case 1.
is provided, and the liquid crystal display element 5 is connected from this drive circuit 9.
And wiring cords 10 and 11 are connected to the lamp 7. A filter 12 is provided in the light-collecting portion of the light guide 6. This filter 12 uses a filter with characteristics corresponding to the color of the light irradiated from the lamp 7, that is, the internal light. For example, the lamp 7 may be a tungsten lamp, etc., which has an orange emission characteristic as shown in FIG. If the filter 12 is to have a blue color transmission characteristic as shown in FIG.
In other words, the filter 12 has a function of suppressing the transmission of the internal light emitted from the lamp 7, so that the filter 12 has a specific color (in this embodiment, a wavelength of about 580 [nm] or more) depending on the emission characteristics of the lamp 7 used. A material with transmission characteristics that mainly transmits light of a specific wavelength (in this embodiment, a wavelength of about 500 [nm] or less) is used so as to suppress the transmission of light of a certain wavelength (wavelength).

In this embodiment configured in this way, when the surroundings are bright, external light (sunlight) is transmitted from the windshield 8 through the filter 12 to the lighting section of the light guide 6 located in the light introduction window 4. irradiated. In this case, even if the external light is somewhat reduced by the filter 12, it will have little effect as it is originally strong light, and after passing through the filter 12, it becomes blue light and travels to the liquid crystal display element 5 side. The illuminated display on the liquid crystal display element 5 is reflected by the mirror display section 3 and displayed toward the driver through the viewing opening 2.

If the surroundings are dark and sufficient external light cannot be obtained through the windshield 8, the light can be turned on either automatically according to the output of an external light sensor (not shown) or manually using a switch (not shown) linked to the headlight switch. Turn on lamp 7.
In this case, the internal light emitted from the lamp 7 turns into orange-colored light and is reflected toward the liquid crystal display element 5 side while repeating reflection inside the light guide 6, and the illuminated liquid crystal display element 5 is The display is similar to the case where the surroundings are bright.

Therefore, the color of the illumination of the liquid crystal display element 5 is blueish when external light is used, and orangeish when internal light is used, and the displayed colors are also divided into two types accordingly. Things will change.

Note that it is possible to configure the lamp 7 to turn on even when the surroundings are bright; in this case,
The light is a mixture of blue and orange, and the degree of orange color is determined depending on the intensity of the light emitted from the lamp 7. If the light intensity of the lamp 7 is arbitrarily selected, the liquid crystal display element 5 is illuminated. You can choose any color of light.

When the surroundings are dark and the lamp 7 is turned on, a part of the internal light emitted from the lamp 7 tends to leak out from the light-collecting part of the light guide 6.
Transmission is suppressed by the filter 12, and as shown in FIG. 4, the windshield 8 is hardly irradiated with the light, thereby preventing a portion of the windshield 8 from shining unnecessarily.

Note that the lamp 7 and the filter 12 are not limited to those having the above-mentioned emission characteristics and transmission characteristics, for example, the lamp 7 may be covered with a color cap of a predetermined color, or the light guide 6 may be placed opposite the lamp 7. A filter of a predetermined color may be attached to the end face of the screen, and when the internal light that is irradiated from the lamp 7 and illuminates the liquid crystal display element 5 is determined in this way, a filter that suppresses the transmission of this internal light may be attached. By using the filter 12 having these characteristics, the same effect as described above can be obtained.

Furthermore, the above configuration can be applied to the liquid crystal display element 5 as long as it is a light-receiving display member.

[Effect of idea]

This invention includes a light-receiving display member, a light guide disposed behind the light-receiving display member and having a light-collecting portion into which external light illuminates the light-receiving display member, and an end surface of the light guide. and an internal light source that emits internal light that illuminates the light-receiving display member, and the light-collecting portion of the light guide has a transmission characteristic that suppresses the internal light from transmitting to the outside. The light-receiving type display member can be illuminated from behind, and the leakage of internal light to the outside can be suppressed, thereby suppressing the generation of unnecessary brightness, thereby giving the user a sense of discomfort. This has the effect that it does not give any effect.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of a display device which is an embodiment of this invention, and FIGS. 2 to 4 are wavelength characteristic diagrams of the same display device. DESCRIPTION OF SYMBOLS 1... Case, 4... Light introduction window, 5... Liquid crystal display element, 6... Light guide, 7... Lamp, 8... Windshield, 12... Filter.

Claims (1)

[Scope of utility model registration request] a light-receiving display member; a light guide disposed behind the light-receiving display member and having a light-collecting portion into which external light illuminates the light-receiving display member; and a light guide disposed opposite to an end surface of the light guide. and an internal light source that irradiates internal light to illuminate the light-receiving display member, wherein a filter having a transmission characteristic that suppresses transmission of the internal light to the outside is provided in the light-collecting portion of the light guide. A display device characterized in that: