JPS62119518A - Display device - Google Patents

Abstract

PURPOSE:To obtain a display device with high-definition, large in size and flat in width by constituting the device with a linear light source, a one- dimensional shutter array of a liquid crystal, and a waveguide plate which guides the output of light corresponding to a scanning line. CONSTITUTION:The output of a linear light source 1 is controlled by a linear shutter array 2, and the output light from the shutter array is led to a waveguide plate 4 by a lens array 3, and waveguides arranged in the Y direction are arrayed in the X direction in the waveguide plate 4. Individual shutters correspond to individual waveguides in 1:1, and the light led to a waveguide is refracted upward in a prescribed scanning line position to form an image on a screen 5. The resolution of this display device is determined by the number of scanning electrodes (Y direction) on the waveguide plate and the number of waveguides (X direction). Thus, the device is made high-definition, large-sized, and flat easily.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a display device using a waveguide plate.

[Summary of the invention]

The present invention relates to a display device including a linear light source and a one-dimensional shutter array for controlling light from the light source.

Large and flat by using a waveguide plate that guides the output from the shutter array in a planar manner.

This realizes a high-definition display device.

[Conventional technology]

A typical example of a conventional display device is a CRT (CRT). The only drawback of this CRT is that it has a large volume, and it is difficult to make it large in size, for example, 40 to 50 inches. On the other hand, flat displays have been devised as a means to eliminate this drawback. Regarding LCDs, which are a typical example of this, the display performance is considerably lower than that of CRTs, and it is difficult to achieve high definition (particularly in the case of LCDs, the higher the resolution, the lower the contrast, and the lower the visibility. There is a wood quality defect that deteriorates.

) Furthermore, at present, it is difficult to increase the size of the CRT, and the drawbacks of the CRT have not yet been compensated for. In particular, in the case of liquid crystals, the cell gear (gap between glasses) is as small as 5 to 0μI1m, which is a major problem when increasing the size. [Problems and objectives to be solved by the invention] Conventional methods have not been able to achieve high resolution. It is difficult to realize a large, flat screen with a high display capacity, and even if it were possible, it would be expensive due to the difficulty in manufacturing it. The present invention is intended to solve these problems, and its purpose is to provide a high-definition, large-sized, flat, and inexpensive display device.

[Means for solving problems]

The display device of the present invention is characterized by comprising a linear light source, a one-dimensional optical shutter array using liquid crystal, and a waveguide plate for guiding light output corresponding to a scanning line.

[Effect]

According to the above configuration of the present invention, light from the light source is modulated by the shutter array. This modulated light is guided to a four-wave plate. The waveguide plate has a function that allows the light output section to be arbitrarily selected depending on the scanning position. The output from this waveguide is incident on the screen adjacent thereto. Therefore, by controlling the shutter array for each corresponding scanning line, an image can be drawn on the screen in a line-sequential manner. In particular, by using ultraviolet light as a light source and incorporating a fluorescent material into the screen that is excited by the ultraviolet light and emits visible light of red, green, and blue, full-color printing can be easily achieved.

〔Example〕

FIG. 1 is a schematic diagram of the invention. Light from linear light source 1
It is controlled by a dimensional shutter array 2. Output light from this shutter array is guided to a waveguide plate 4 by a lens array 3. The waveguide plate has waveguides arranged in the Y direction and arranged in the X direction. Naturally, m, wave M3
The number of shutter arrays matches the number of shutter arrays. That is, each waveguide corresponds to each shutter in a 1:1 ratio. The light introduced into the waveguide is refracted upward at a predetermined scanning line position to form an image on the screen 5. The resolution of this display device is determined by the number of scanning electrodes (in the Y direction) of the waveguide plate and the number of waveguides (in the X direction).

FIG. 2 shows an example of a waveguide plate used in the present invention. First, (A) shows a cross section of the waveguide plate in the Y direction, and there is a transparent electrode between two plates of glass 11, 12 or an equivalent material.
3. It further comprises a medium 16.

Joule heat is generated by passing a current through the transparent electrode. As a result, the refractive index of the medium is n. From nl+nZ+n3
The distribution is as follows. The material of the medium is preferably one such as alcohol, organic acid, or liquid crystal, whose refractive index changes greatly with a slight temperature rise from around room temperature. As a result of the heat generation, the light that has entered the waveguide through total reflection is guided upward according to the refractive index distribution and is projected onto the screen 10. (b) shows a cross section of the waveguide plate in the X direction. Each waveguide is blocked by a lip 14. A metal reflective film 15 can also be used to improve waveguide performance. (C) is a plan view of this waveguide plate. Whether or not the transparent electrode 13 generates heat is selected by a switch 17 in accordance with the scanning position. In this case, the thermal response increases, that is, the heating speed is required to be faster than the scanning speed5). However, cooling can be done quite slowly by waiting for natural air cooling. This is because light no longer enters the previous position from the newly generated scanning position, so it does not matter what happens.

FIG. 3 is an example of a plan view of the screen 20 used in the present invention. In order to achieve full color, a fluorescent lamp that emits ultraviolet light was used as the light source, and the screen was colored red, corresponding to each waveguide on the waveguide plate.

Apply blue and green fluorescent materials to J3<. As a result, the incident ultraviolet light excites each of the fluorescent materials 1' and 1', thereby making it possible to obtain a vivid color image.

FIG. 4 shows an example of the configuration of a liquid crystal shutter array used in the present invention. In the cross-sectional view (c), two glasses 30, 31.
and transparent electrodes 32, 33 on each glass plate. and a liquid crystal 36 driven by its transparent electrode. A light shielding film 34 is also provided to cut off excess light. In the plan view (A), the transparent electrode 3 is placed outward from the seal portion 35.
2 is pulled out and driven from the outside. Aperture section 37
controls the scene according to the display information of the scanning position selecting the incident light from the light source. The number of apertures matches the number of waveguides on the waveguide plate.

FIG. 5 clearly shows the light input portion of the present invention. The whole light source is 59. reflector 60, lens array 58. Shutter array 61. It has a configuration called a waveguide plate 62. The waveguide plate 62 is made of glass plates 51, 52. It also has a seal portion 53 for holding the medium to be enclosed. In order to allow light to enter the seal portion without loss, microlenses having a lens function are arranged in one dimension, similar to the lens array 58. The shank array 61 is made up of glass plates 54, 55, a sealant 56, and a liquid crystal 57 as in FIG.

FIG. 6 shows an arrangement of rod lenses as an example of the configuration of a lens array. The material is glass.

Or made of plastic. Each lens 71 is fiber-shaped or planar, and has a simple lens function.

〔Effect of the invention〕

As described above, according to the present invention, unlike conventional display devices that are arranged uniformly in two dimensions, display control in the X direction is performed using a one-dimensional light source and a shutter array, and in the Y direction, It is controlled by a waveguide plate that allows the scanning position to be selected, and the two are combined and displayed on the screen. waveguide plate,
And large screens can be easily created. Moreover, it is easy to reduce the pinch of the waveguide to less than 11I.

On the other hand, if the shutter array is one-dimensional, it is easy to form a long liquid crystal, which has traditionally been difficult to enlarge. Therefore, the demands for high definition, large size, and flatness can be easily realized. Furthermore, unlike conventional display devices whose structure itself is largely dependent on the physical properties of materials, there are fewer restrictions on materials, and this has a significant effect in that a low-cost display device can be provided.

[Brief explanation of drawings]

Figure 1 (al is a schematic diagram of the display device of the present invention, (a) is a side view, and (b) is a plan view. Figure 1 (bl is a schematic diagram of a part of the display device of the present invention; ) shows a side view (b) shows a plan view. Fig. 2 shows a configuration diagram of a waveguide plate of the present invention. no-n3... shows refractive index distribution. Fig. 3 shows a screen used in the present invention A diagram showing an example of R, G, B... showing the appearance of each fluorescent material coated. FIG. (B) is a side view. (C) is a cross-sectional view. 30.31...Glass 32.33...Transparent electrode 34...Light blocking layer 35...Seal portion 36...
-Liquid crystal 37...Aperture Figure 5 is a diagram showing the configuration of light guiding to the waveguide plate used in the present invention. 51,. 52, 54, 55...Glass plate 53...Lens array/sealing material 56...Seal portion, 57...Liquid crystal Figure 6 is a configuration diagram of the lens array. Fig. 1 (O-) 10., l-input warion 1q... Kotsu Fig. 1 (
5) 3rd m Figure 4

Claims (1)

[Claims] (1) A linear light source, a one-dimensional shutter array that controls the scene according to a display signal at a selected scanning position using incident light from the light source, and introducing light that passes through the shutter array to the selected scanning position. A display device comprising a waveguide plate made up of a plurality of waveguides that emit light to the screen side, and a screen that forms the emitted light from the waveguide plate as a display image, the waveguide plate having an arbitrary A display device characterized by having a function of emitting light guided by a scanning electrode to the outside.