JPH0348631Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an internally illuminated display device that makes the display surface of a liquid crystal display device easy to see.

[Conventional technology]

Air conditioner display devices and internal/external air control devices installed in modern automobiles guide light from a light source to a front panel (surface board) using a transparent light guide plate made of acrylic resin, etc. Devices that brightly and evenly illuminate the entire display section are widely used to improve nighttime visibility, operability, and the interior of a vehicle.

In addition, the clocks installed in automobiles are changing from conventional analog types to digital types that can be read accurately, and the digital types are also changing from fluorescent display tubes to liquid crystal display devices from the perspective of saving power consumption. However, since the liquid crystal display device is not a light-emitting type, it is necessary to illuminate it from the front or rear with an appropriate lighting device at night. In this case, especially in the back lighting (internal lighting) method, a light guide plate is usually used to illuminate the entire liquid crystal display device uniformly. 3 and 4 show a conventional example of a heater control device equipped with this type of liquid crystal display device. This will be briefly explained based on the figures. Reference numeral 1 denotes a case body; A display plate (front lens) 2 is disposed on the surface of the light guide plate 3 via a light guide plate 3. The display board 2 is made of transparent or semi-transparent plastic material, glass, etc., and a light-shielding film 6 is provided on the back surface of the display board 2 other than the display area 5 for characters, symbols, etc.

The light guide plate 3 has a through hole 7 at one end, and a light source 8 is inserted into the through hole 7 from the back side of the case body 1. Further, a large number of stipples 10 are formed on the back surface of the light guide plate 3 at locations corresponding to the display section 5 . The dots 10 diffusely reflect the light guided into the light guide plate 3 from the light source 8, and each display portion 5 of the display plate 2
It is designed to illuminate the display section 5 with the same brightness and consists of small conical recesses, the number of which increases as the display section 5 is farther from the light source 8 in consideration of light attenuation.

A transparent display section 11 is formed at the end of the display panel 2 on the light source 8 side, and a liquid crystal display device 12 is disposed behind the display section 11 at an appropriate distance from the display panel 2. . The liquid crystal display device 12 includes a well-known liquid crystal substrate element 13 that displays the time, minutes, and seconds in a sun-shaped pattern by enclosing a twisted nematic liquid crystal, and a pair of conductive rubber 14.
A, 14B, a printed wiring board 15 having various electrical components (not shown) mounted on the back surface thereof, and the liquid crystal board element 13 extending to the end of the light guide plate 3 on the light source 8 side. It is disposed on the surface of the extension portion 3A via a differential user 16. The upper and lower ends of the front side of the liquid crystal board element 13 are connected to the case body 1.
A holder 18 disposed therein is fixed to the extension portion 3A via a gasket 19, thereby restricting movement of the substrate element 13 in the longitudinal and vertical directions. The movement of the liquid crystal substrate element 13 in the left-right direction is restricted by both side edges of the front opening 24 of the holder 18.

A reflector 23 that reflects the light from the light source 8 forward is disposed on the back surface of the extension portion 3A in correspondence with the liquid crystal board element 13, and the printed wiring board 15 is fixed with screws. The electrical circuit of the wiring board 15 and the electrodes (not shown) of the liquid crystal substrate element 13 are electrically connected via the pair of conductive rubbers 14A and 14B.

Note that 25 is a switch for adjusting seconds.

[Problem that the invention attempts to solve]

However, in such a conventional heater control device, since a gap is formed between the display panel 2 and the liquid crystal display device 12 by the holder 18, when viewed from the front, the liquid crystal display device 12 looks depressed. However, there was a problem that the visibility of the liquid crystal display device 12 was poor.

[Means for solving problems]

The internally illuminated display device according to the present invention has been developed to solve the above-mentioned problems, and includes a liquid crystal display device disposed between the case body and the light guide plate, and the light emitted from the light source is illuminated as described above. In an internally illuminated display device in which light is guided into a light guide plate and illuminates the liquid crystal display device, an opening is provided on the surface of the case body corresponding to the liquid crystal display device, and a light beam is provided at the periphery of the opening. A display surface setting projecting portion is integrally provided to set the display surface of the liquid crystal display device to be substantially the same as the surface of the case body.

[Effect]

In the present invention, the surface of the case body and the display surface of the liquid crystal display device are made almost on the same plane by the display surface setting projection, so that the liquid crystal display device does not feel depressed and visibility is improved.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIG. 1 is a front view showing an embodiment of the present invention applied to an automobile heater control device;
FIG. 2 is a sectional view of the main part of the device. In the drawings, the same constituent members and parts as in FIGS. 3 and 4 are designated by the same reference numerals, and their explanations will be omitted. In these figures, the case body 1 is transparent or translucent, and a recess 30 into which the display plate 2 can fit is formed on its surface, so that the surfaces of the case body 1 and the display plate 2 are connected to each other. They form the same plane. Further, an opening 24 is formed on the surface of the case body 1 in correspondence with the liquid crystal display device 12, and a display screen setting projection 32 facing into the opening 24 is provided around the entire periphery of the opening 24. The surface 32a is integrally protruded from the surface 1 of the case body 1.
The inner surface 32b protrudes from the surface 1a and forms substantially the same plane as the surface 1a.

The liquid crystal display device 12 is inserted into the opening 24 from the back side of the case body 1, and the peripheral edge of the display surface 12a is in close contact with the inner surface 32b. Therefore, the display surface 12a of the liquid crystal display device 12 also forms the same plane as the surface 1a of the case body 1 and the surface of the display board 2. In addition,
A pair of insertion holes 34 and 35 are formed in the light guide plate 3, and conductive rubbers 14A and 14B and reinforcing ribs 3 of the case body 1 are inserted into these insertion holes 34 and 35.
6 and 37 are respectively inserted. Further, numerals 38 and 39 in FIG. 1 are switches for adjusting the time and minutes.

Thus, according to the heater control device having such a configuration, since the display surface 12a of the liquid crystal display device 12 forms the same plane as the surface 1a of the case body 1, there is no feeling of depression of the display surface 12a. Visibility can be improved.
Furthermore, if the opening 24 is blocked by the display board 2, it may be difficult to read the time due to external light that hits the display board 2 and is reflected, but in the present invention, the opening 24 is not blocked. This allows you to easily know the time without any unexpected situations occurring. In addition, since the display surface setting projecting portion 32 is integrally provided on the case body 1, there is no increase in the number of parts.
It can be provided at low cost.

Although the above embodiment has been applied to a heater control device as a display device, the present invention is not limited to this and can of course be applied to various internally illuminated display devices such as a display device for a stereo device.

[Effect of idea]

As explained above, in the internally illuminated display device according to the present invention, a display surface setting projecting portion is integrally provided on the periphery of the opening formed on the surface of the case body, and this projecting portion connects the surface of the case body. Since the display surface of the liquid crystal display device is set almost on the same plane, the display surface does not feel depressed, improving the visibility of the liquid crystal display device, and also making it possible to make the device itself thinner. do.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the present invention applied to an automobile heater control device;
Figure 2 is a sectional view of the main parts of the device, Figures 3 and 4.
Each figure is a sectional view of a liquid crystal display unit in a conventional heater control device. DESCRIPTION OF SYMBOLS 1... Case body, 2... Display board, 3... Light guide plate, 8... Light source, 12... Liquid crystal display device, 12a
... Display surface, 24 ... Opening, 32 ... Projection for setting display surface.

Claims (1)

[Scope of utility model registration request] In an internally illuminated display device, a liquid crystal display device is disposed between a case body and a light guide plate, and light emitted from a light source is guided into the light guide plate and illuminates the liquid crystal display device. an opening corresponding to the liquid crystal display device is provided on the surface of the case, and a display surface setting tensioner is provided at the periphery of the opening to face into the opening and set the display surface of the liquid crystal display device to be substantially the same as the surface of the case body. An internally illuminated display device characterized by having an integral part.