JPH0516580Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention is a liquid crystal display configured so that various liquid crystal display parts are displayed separately in the front and back direction, and three-dimensional display can be performed in the depth direction. It is related to the device.

[Background of the invention] In order to make possible three-dimensional display that could not be obtained with conventional liquid crystal display devices, the inventors of the present invention have developed a system for displaying, for example, a speed display in front of the driver's seat of a car, an engine rotation display, In addition to being able to display multiple displays such as temperature display and fuel liquid level display within a limited space,
Each of these displayed information has depth in the front and back direction when viewed from the driver's seat, and can provide a remarkable three-dimensional display feeling, which is a novelty that could not be obtained with conventional liquid crystal displays. We are currently developing a liquid crystal display device. Furthermore, to explain the prior example of this liquid crystal display device based on FIG. 2, 1A and 1B are as follows.
The structure of the front liquid crystal cell 1A, which is a positive type liquid crystal cell on both front and rear sides, includes two transparent substrates 4a in the front and rear directions that form a liquid crystal filling space 3 via a spacer 2,
4b, and a TN liquid crystal 5 filled in the enclosed space 3. A transparent common electrode 6a is formed on the inner surface of one transparent substrate 4a, and a transparent common electrode 6a is formed on the inner surface of the other transparent substrate 4b. is the display 1 of bar graphs, character symbols, etc. for vehicle speed display shown in Figure 3.
A pattern electrode 6b for carrying out the process 6a is formed. The configuration of the front liquid crystal cell 1A has been described above, and the rear liquid crystal cell 1B has a similar configuration. That is, 2 is a spacer, 4a and 4b are transparent substrates, and 5 is a TN sealed in the liquid crystal filling space 3.
The liquid crystal 6a is a common electrode formed on the inner surface of one transparent substrate 4a, and 6c is formed on the inner surface of the other transparent substrate 4b, and displays the rotation speed, fuel amount, temperature, etc. as shown in FIG. This is a display pattern for displaying the display 16b using bar graphs and character symbols. The two liquid crystal cells 1A and 1B configured in this way are separated by a spacing frame 8 that secures a space 7 for three-dimensional display by both liquid crystal cells 1A and 1B, for example. The distance between the front and back liquid crystal cells 1A and 1B is 10 to 20 mm.
(preferably 15mm). Furthermore, the front of the front liquid crystal cell 1A and the rear liquid crystal cell 1
Polarizing plates 9 are superposed on the front and rear surfaces of B to form positive liquid crystal displays A and B. Reference numeral 10 denotes a light diffusing and reflecting plate disposed behind the rear positive type liquid crystal display B, and this reflecting plate 10 covers the rear surface of the rear positive type liquid crystal display B and the light diffusing and reflecting plate 1.
It is formed into a dome shape (bowl shape) in order to form a depth 11 of space between it and 0. This space 11 is secured to be 5 to 10 cm (preferably 7 cm). 1
2 indicates 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;
Further, in order to prevent the light from the light source 12 from directly entering the eyes, an umbrella 13 made of a light shielding member or a semi-transparent member is placed close to the light source 12. 14
Reference numeral 15 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.

In this way, the two liquid crystal displays A and B are spaced apart in the front and back direction via the frame 8 for maintaining the distance, and the display information displayed by the liquid crystal displays A and B is displayed in three dimensions. However, in this structure, the positive type information display 1 displayed by the liquid crystal displays A and B
6a and 16b are displayed three-dimensionally as if they were floating in the air, a light diffusing and reflecting plate 10 positioned on the back side of the liquid crystal displays A and B is formed in a dome shape to secure a space 11. Due to its limited size, a deep dome-shaped light diffuser reflector 1
0, the depth dimension of the entire liquid crystal display device has become large.

In particular, there has been a demand for miniaturization of liquid crystal display devices installed in limited spaces such as automobiles.

[Purpose of the invention] The present invention was made in response to such a demand, and it is possible to flatten the light diffusing and reflecting plate 10 to significantly reduce the depth width of the entire liquid crystal display device, and to make it possible to significantly reduce the depth width of the entire liquid crystal display device. The purpose of the positive information displays 16a and 16b is to provide a liquid crystal display that can sufficiently provide a three-dimensional effect that appears to float forward from the light diffusing/reflecting plate 10.

[Example of the invention] The present invention will be explained in detail below based on the example shown in FIG. Reference numerals are given and descriptions of the same structural parts are omitted.

That is, the feature of this embodiment is the structure of the light diffusing and reflecting plate, and the other structures are the same as those of the prior art example.

Reference numeral 17 denotes a concave Fresnel lens placed on the back of the rear liquid crystal display B. On the back of the concave Fresnel lens 17, there is a flat light guide plate 18 and a flat plate superposed on the back of the light guide plate 18. A light diffusing and reflecting plate 19 is arranged, and the light guide plate 1
8 receives light from a light source 20, and due to the action of the light source 20 and the light diffusing/reflecting plate 19, the front surface of the light guide plate 18 emits light with approximately uniform brightness. .

In this way, the light diffusing and reflecting plate 19 that can emit surface light
By arranging the concave Fresnel lens 17 in front of the LCD, when the Fresnel lens 17 is viewed from the front of the LCD through both LCDs A and B, the reflective surface of the light diffusing and reflecting plate 19 Since it looks like a concave spherical curved surface curving in the back direction, it is shown on each liquid crystal display located in front of the light diffusing and reflecting plate 19. Each of the information displays 16a and 16b appears to be floating in front of the light diffusing and reflecting plate 19, providing the desired effect of three-dimensional display. Furthermore, in this embodiment, a concave Fresnel lens 17 and a light guide plate 18 are located behind the liquid crystal display.
Since the light diffusing and reflecting plates 19 and 19 are both flat plates, the depth width of the illumination structure made up of these flat plates can be significantly reduced. This has the effect of providing a small-sized liquid crystal display device that can reduce the depth of the liquid crystal display device that can display images.

Note that if a convex Fresnel lens is used instead of the concave Fresnel lens 17, the center portion will feel like it is protruding forward.

[Summary of the invention] As described above, the present invention consists of positive type liquid crystal displays A and B that are spaced apart from each other, and a flat light that is arranged on the back side of the positive type liquid crystal displays A and B. A liquid crystal display device comprising a diffuser reflector 19, characterized in that a concave Fresnel lens 17 is interposed between the light diffuser and reflector 19 and the rear positive liquid crystal display B. It is.

[Effect of the invention] Therefore, according to this liquid crystal display device, the concave Fresnel lens 1 located behind the rear liquid crystal display
7. Since the light guide plate 18 and the light diffuser reflector 19 are both flat plates, the depth of the illumination structure composed of these flat plates can be significantly reduced. Since the reflecting surface appears to be a concave spherical surface curved toward the back, each information display 16a, 16b shown on each liquid crystal display located in front of the light diffusing and reflecting plate 19 is It also appears as if it is floating in front of the screen, providing an effective three-dimensional display feeling for the intended purpose.

[Brief explanation of drawings]

FIG. 1 is an explanatory cross-sectional view showing an embodiment of a liquid crystal display device according to the present invention, FIG. 2 is an explanatory cross-sectional view showing a previous example thereof, and FIG. 3 is an explanatory view of the display mode of each display 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 diffuser reflection plate, 11... Space, 12... Cold cathode discharge tube,
13...Umbrella, 14...Base frame, 15...Drive integrated circuit, 16a, 16b...Display, 17...Concave Fresnel lens, 18...Light guide plate, 19...Light diffuser reflection plate, 20... light source.

Claims (1)

[Scope of utility model registration request] Positive type liquid crystal displays A and B separated from each other in the front and rear;
A liquid crystal display device comprising a flat light diffusing and reflecting plate 19 disposed on the back side of the positive type liquid crystal displays A and B, wherein the light diffusing and reflecting plate 19 and the rear positive type liquid crystal display A liquid crystal display device characterized in that a concave or convex Fresnel lens 17 is interposed between B and B.