JPH0422376Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention is a translucent display device configured so that various display sections are displayed separately in the front and back direction, and three-dimensional display can be performed in the depth direction. The present invention relates to a lighting device for a display panel.

[Background of the invention] A conventionally known two-layer liquid crystal display device has a structure as shown in FIG. 4, for example. This consists of three transparent substrates 31a, 3 that are spaced apart in parallel.
A two-layer TN type liquid crystal layer 3 is placed between 1b and 31c.
2 and outer transparent substrates 31a and 3.
Polarizing plates 33 whose polarization axes are in the same direction are attached to the outer surface of 1c, and a light diffusing plate 34, a light source 35, and a plain reflecting plate 36 are further arranged behind the polarizing plates 33. It is something.

When mounting such a two-layer liquid crystal display, various display patterns 37 can be formed on both the front and back surfaces of the transparent substrate 31b located in the middle, so that complex display patterns can be provided. However, on the other hand, the thickness of the transparent substrate 31b that separates both the front and rear liquid crystal layers is thin, similar to the thickness of the transparent substrates 31a and 31c located on the outside, as can be seen in the figure. Therefore, when both the front and back displays occur at the same time, it is impossible to recognize the overlapping part of the display information, and the display information on both the front and back sides is displayed separately in the front and back direction, that is, the display is 3D. It was something that I couldn't feel.

[Purpose of the invention] The present invention provides a three-dimensional display that cannot be obtained with such conventional two-layer liquid crystal display devices, that is, a translucent display panel in which a plurality of pieces of display information are spaced in the front and rear directions and displayed three-dimensionally. The object of the present invention is to provide a lighting device.

Furthermore, to describe the purpose of the present invention in detail, for example, the speed display displayed in front of the driver's seat of a car,
In addition to being able to display multiple displays such as engine revolutions, temperature, and fuel level on a liquid crystal display within a limited space, each of these display information can be displayed in the front and back when viewed from the driver's seat. To provide a novel lighting device for a translucent liquid crystal display panel, which has depth in the direction and can obtain a remarkable three-dimensional display feeling, which cannot be obtained with conventional liquid crystal displays. There is a particular thing.

[Embodiments of the invention] Examples of the invention will be described below based on the embodiments shown in FIGS. 1 to 3.

This embodiment is a liquid crystal display device installed in front of the driver's seat of an automobile to display automobile information. 1A and 1B are positive type liquid crystal cells on both the front and rear, and the front liquid crystal cell 1A is The structure includes two transparent substrates 4a and 4b in the front direction forming a liquid crystal enclosure space 3 via a spacer 2, and a TN type liquid crystal 5 filled in the enclosure space 3, one of which is the transparent substrate 4a. A transparent common electrode 6a is provided on the inner surface of the
A pattern electrode 6b is formed on the inner surface of the other transparent substrate 4b to form a display pattern such as a bar graph and character symbols for displaying vehicle speed as shown in FIG. 3a. . The above is the configuration of the front liquid crystal cell 1A, but the rear liquid crystal cell 1B is also configured in the same manner. That is, 2 is a spacer, 4a and 4b are transparent substrates, 5 is a TN type liquid crystal sealed in the liquid crystal filling space 3, 6a is a common electrode formed on the inner surface of one transparent substrate 4a, and 6c
is a display pattern formed on the inner surface of the other transparent substrate 4b and for displaying the rotational speed, fuel amount, temperature, etc. in bar graphs and character symbols as shown in FIG. 3b. The two liquid crystal cells 1A and 1B configured in this way are separated by a gap-maintaining frame 8 that secures a space 7. For example, the distance between the front and rear liquid crystal cells 1A and 1B is 10 to 10. A spacing of 20 mm (preferably 15 mm) is maintained. Further, polarizing plates 9 are superposed in front of the front liquid crystal cell 1A and on the front and rear surfaces of the rear liquid crystal cell 1B to form positive type liquid crystal displays A and B.

Reference numeral 10 denotes a light diffusing and reflecting plate which is disposed behind the rear positive type liquid crystal display B and whose light diffusing surface is coated in white. It is formed into a dome shape (bowl shape) to form a space 11 between the rear surface of the light diffusing and reflecting plate 10. The depth of this space 11 is ensured to be 5 to 10 cm (preferably 7 cm). Reference numeral 12 denotes a cold cathode discharge tube (light source) disposed around or in a part of the light diffuser and reflector 10 to illuminate the surface of the light diffuser and reflector 10 substantially uniformly. A light-shielding or semi-transparent umbrella 1 to prevent the light from entering the eyes directly
3 is close to its light source 12. Reference numeral 14 indicates a base frame attached to the front surface of the front positive type liquid crystal display A, and reference numeral 15 indicates a driving integrated circuit attached to the upper side of each transparent substrate 4b. What is important in this embodiment is the dome-shaped light diffusing/reflecting plate 10 located behind the rear positive type liquid crystal display B. That is, as shown in FIGS. 2a, b, and c, this light diffusing and reflecting plate 10 has an opening 10a on the front surface.
Since it is formed in a dome shape that curves further along the depth direction, the dome-shaped light diffusing and reflecting plate 1
A space 11 is formed between the concave reflective surface of 0 and the displays A and B, and the entire reflective surface is evenly illuminated by the light source 12, so that the displays A and B The rear of the room is uniformly illuminated across the space 11.

Therefore, by driving the front positive type liquid crystal display A and the rear positive type liquid crystal display B and further turning on the light source 12, the front positive type liquid crystal display A has a display section 16a as shown in FIG. 3a. In addition, in the case of the rear positive type liquid crystal display B, the display section 16a as shown in FIG. Since the positive liquid crystal display devices B are spaced apart in the front-rear direction by the frame 8, a three-dimensional effect in the front-rear direction can be obtained in the display by the dual display devices A and B. Furthermore, since the light diffusing and reflecting plate 10 for background illumination for transmitted illumination is provided behind the rear positive type liquid crystal display B with a space 11 in between,
When the liquid crystal display device with the above configuration is viewed from the front, obliquely, etc., both liquid crystal displays A and B
Each positive type display 16a and 16b displayed by
As shown in FIG. 3d, it appears three-dimensionally in the front and rear directions (as if floating in the air against the background of the uniform reflection surface of the light diffusing and reflecting plate 10), providing ease of viewing and beauty that cannot be obtained with conventional liquid crystal display devices. A clear liquid crystal display is possible. Since the light source 12 in the above embodiment is a cold cathode discharge tube, the amount of heat generated is small, and there is no problem of heat being trapped inside the bowl-shaped light diffusing/reflecting plate 10.

[Summary of the invention] As described above, the present invention has a space 11 that is located behind the positive type translucent display devices A and B and has a bowl-shaped concave curved surface between the display devices. A light-transmitting display panel comprising: a light-diffusing reflector plate 10 formed on a reflective surface; and a light source 12 disposed around the entire periphery of the light-diffusing reflector plate 10 or a part thereof. This is a lighting device.

[Effects of the invention] Therefore, according to the lighting device of this invention, it is possible to provide uniform reflective illumination behind the translucent display with a space provided behind it, so that the display by the display can be seen in the front and rear directions. The display appears three-dimensional and appears as if it were floating in the air against the reflective surface, making it possible to achieve an easy-to-see and beautiful transmissive lighting display that cannot be achieved with conventional display lighting devices. There is.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional explanatory diagram showing an embodiment of a liquid crystal display device according to the present invention, Fig. 2 a, b, and c are a front view, plan view, and side view showing the shape of the reflector, and Fig. 3 a.
and b are explanatory diagrams of display modes by each display device, the third
FIG. 3c is an explanatory diagram of a state in which the displays of these displays are combined, FIG. 3d is a perspective view of the same as the above, and FIG. 4 is an explanatory diagram of the conventional device. A...Front liquid crystal display, B...Rear liquid crystal display, 1A...Front liquid crystal cell, 1B...Rear liquid crystal cell, 2...Spacer, 3...Space, 4a, 4b,
4c...Transparent substrate, 5...TN type liquid crystal, 6a...
Common electrode, 6b, 6c...Pattern electrode, 7...
Space, 8... Frame, 9... Polarizing plate, 10... Light diffusing and reflecting plate, 10a... Opening periphery, 11... Space,
12...Cold cathode discharge tube, 13...Umbrella, 14...Base frame, 15...Drive integrated circuit, 16a, 16b...
…display.

Claims (1)

[Claims for Utility Model Registration] 1. A reflecting surface located behind the positive type translucent display devices A and B and forming a bowl-shaped concave curved surface with a space 11 formed between the display device and the display device. It has a formed light diffusing and reflecting plate 10 and a light source 12 disposed around the entire periphery of the light diffusing and reflecting plate 10 or a part thereof for uniformly illuminating the light diffusing and reflecting plate 10. A lighting device for a translucent display panel characterized by: 2. The illumination device for a translucent display panel according to claim 1, wherein the light source 12 is a cold cathode discharge tube.