JPS59123871A - Large display unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a large, thin display device comprising a plurality of pixel forming units using a drowsy optical element such as a liquid crystal.

There are various types of conventional large display devices, such as a movie projector, an overhead projector, and a device that enlarges and projects a high-sensitivity cathode ray tube image on the back side of a screen. Here, as an example of a conventional large-sized display device, various latter examples shown in FIG. 1 will be explained.

In Figure 1, 1 is a high-sensitivity plow/tube, #2 is an optical path that has a lens that magnifies this image, 2a and 2b represent the optical path boundary, 63 is a reflecting mirror, and 4 is a semi-transparent surface. To create a 7-screen, color display device, six high-sensitivity cathode ray tubes (1) were used.

It is sufficient to project the three primary colors independently onto the screen. here,
A large display device is one that has a screen size of approximately 1 m square or more.In the conventional large display device shown in Figure 1, the image magnification is large, so even with a high-sensitivity cathode ray tube, the image brightness is low. Since it is necessary to have a long optical path length, it is necessary to make the reflecting mirror 3 thick or to arrange it with sufficient depth. In either case, the large display device has a large depth, making it unsuitable for use in home televisions and the like. Furthermore, to make a color image, 1i of %3 cathode ray tubes are required.
IJl has a defect that makes color matching difficult. Therefore.

-It looks like the device shown in Figure 1 can be manufactured at low cost, but
It also has expensive defects.

The purpose of this work is to eliminate such deficiencies. An object of the present invention is to improve the drowsiness of optical components such as liquid crystals.

Although it is originally a thin display, it has a large number of multiplexes (in particular, in order to form a large number of pixels, the number of multiplexes must be set to a level that does not impair image quality, and the overall pixel It is an object of the present invention to provide a thin and inexpensive large-sized display device that is composed of a plurality of divided units.

The present invention will be explained below with reference to the drawings. Figure 2 is.

Figures illustrating the entire outline of the present invention; (a) is a cross-sectional view; (b) is a cross-sectional view;
) is a front view, and Figure 6 shows an example in which a large screen is configured with 5 x 5 = 25 units. fa 5 is a translucent screen;
6 is a pixel forming unit whose screen side is 7af, enlarged like light v8, and set to 7b so that there is no blank space between the pixels of the adjacent unit.

Ensure that the entire screen is uniformly obtained. In (b).

The sides of the units forming both armies shown in Figure 2, which shows a 7a square screen enlarged and displayed on a 7b square screen, will be explained with reference to Figure 3. The same number of tatami mats in all figures hereinafter represent the same or similar meanings or means.

Figure 3 shows a large display device M according to the present invention with a different light source.
(a) shows an example of the pixel forming unit configuring the pixel forming unit.

Shown in (b) and (c).

10d unit frame, 11 is a liquid crystal display that is driven with an appropriate number of multiplexes to form a predetermined image, 12 is a printed circuit board, and 13 is a drive circuit that drives and displays one display 11 in a predetermined manner. It also communicates with a connector 14 that connects data etc. taken in from outside the unit. 15 is a flat light source.

For example, a fluorescent substance that has been completely coated on a flat surface emits thermoelectrons on a flat surface, or it emits light when excited by ultraviolet rays like a normal fluorescent lamp.If the light is emitted on a flat surface, it emits relatively parallel light components. 16 is a filter that makes the wavelength distribution of the light source 15 appropriate, and is unnecessary if the light source 15 emits light with an appropriate wavelength distribution.

Reference numeral 17 is a concave lens that reflects the light and magnifies the image. Since the light passing through the concave lens on the screen 5 does not form a real image, the screen 5G is made semi-transparent so that it passes through the screen 5G irregularly, so that it looks like a real image is formed. Thermal theory, you can use a convex lens to form a real image on the screen, but 1
Since the original path is long, the depth is thick, making it unsuitable for thin display devices.

It is also possible to create each unit of 17 concave lenses.

If the entire display device is integrally molded with plastic at positions corresponding to each unit, an inexpensive device can be obtained. 18
is a pixel of the display body 11 of the light of the light source 15.

Or indicate the size of the light WII- of IIJA11 outside the image. Is 19 the light for Shun's unit? If each unit is configured as shown in (a), a uniform large screen with close gaps is formed on the screen 5 as shown in (b).

(Bli shows an example of using an inexpensive point light source such as a filament lamp 20 to obtain a parallel light source. 21 is a parabolic reflector.) (c) shows an example of another method to obtain a parallel light source. 822
represents a rod-shaped fluorescent lamp, and its length extends to each unit arranged in a direction perpendicular to the page.

25 is designed so that parallel light cannot be obtained with a reflecting mirror parallel to the fluorescent lamp 22 and having a parabolic cross section. 24, shown as a dotted line, is an optical conduit that further improves parallelism. If the parallelism of the light is good, images that are faithful to the original image can be obtained without being affected by adjacent pixels. The light pipe 24 is made of a plurality of thin opaque materials connected to each other and has a rectangular or hexagonal cross section. If the ratio between the cross-sectional opening and the length of the light pipe 24 is sufficient, parallel rays of light can be obtained on the principle that all the stars can be observed from the well during the daytime. Looking at the unit in Figure 5 from the perspective of thinning.

The order of (a), (b), and (c) is probably reverse order from a cost perspective. This will be explained using Figure 4. 25 is a flat substrate made of transparent glass or the like, and the liquid crystal is sandwiched between the substrates 25a and 25b. Board 25 au * Transparent turtle 11ff1 is arranged horizontally with 3 sailors 26a and 26b''ff.

The substrate 25 bK is divided into upper and lower parts on the paper and 6 bright electrodes 27
A and 27bf arrangement. If the liquid crystal is twisted nematic, the liquid crystal is oriented in a predetermined direction. In this case, although not shown in the first drawing, two polarizing plates are used on both sides of the substrate 25 so that the plane of polarization is in a predetermined direction. Display body 11 is like this.

By sequentially applying scanning signals in the vertical direction and adding pixel data in the horizontal direction, a predetermined electric field is generated between the electrodes 26 and 27, controlling the amount of transmitted parallel light rays that are uniformly applied.
Compose a partial image in the diagram.

The scanning signal is received by a clock 35 of a predetermined period, and the scanning signal generator 32 outputs the wires 29a and 29b? - through the electrode 26a
and 26b. As for pixel data, 1 pixel data 3Ib is serially given to data drive circuit -30a and 50t+,
It is stored sequentially and latched and held in synchronization with the scanning signal.
j 28a and 28b'i to the electrodes 27a and 27b. The gradation is determined by setting the output time of the latch-held pixel data to the scanning signal period of 1100'l, and determining the data I#A.
The gradation data separately provided to the dynamic circuit is abbreviated as 1.

1cc), B, and B in the data drive circuit 30.

This corresponds to the three primary colors green and red W when displaying in color on a display device. 64 or the smallest pixel unit in case of color display. Corresponding to electrode 27.

Substrate 25. Or G on a polarizing plate or even another substrate.

R and B filters are provided in a strip or island shape.

In the example of FIG. 4, it is shown as an island. , ld at evening 1, minimum pixel? The actual value is 1 × 5 = 5, whereas the apparent value is 3 × 3 =
The id of 9 is: % Experimentally, the latter is more natural as an image than 1ζ.

%i, IK In the example in Figure 4, the number of multiplexes is set to 2.
The 1nIi prime number is shown as 2XAX2=16, but with current liquid crystal materials /):ii and ljf, the multiplex number is at most 32 due to the opening/closing ratio of the amount of light transmission and the opening/closing speed. If it is more than this, the contrast and brightness will be unsatisfactory.

Therefore, if the large display device according to the *invention is applied to a television, the number of effective scanning lines according to the NTSO system is about 480, so 48・0÷32=15. Or, as shown in Figure 4, if the number of multiplexes is the same and they are divided into upper and lower sections, it will be 480 ÷ (
32X2)÷8, depending on the number of horizontal lines,
15. Or, a large number of units with a convergence factor of 8 are required.

The display device in the prevention unit is a factor in the cost increase due to assembly, but depending on the type of light source, it is possible to install a wall-mounted TV with a depth of about 50 mm and a screen of 1 TY + square or more.
This is a feature of the large-sized display device according to the present invention, which has great cost performance. Furthermore, since the liquid crystal display itself has low power consumption, it is a feature of the present invention that by using a highly efficient light source, a large display device with much lower power consumption than a cathode ray tube type can be obtained. .

In this article, we have explained the case where twisted nematic liquid crystal material is applied to the display body 11 that opens, closes, or controls the transmission of light, but DS
Even if it's an M-type LCD, I won't buy it6.

Other materials having an electro-optical effect such as electrochromics may also be used as long as they have a predetermined light opening/closing speed.

Next, a configuration example in which the large display device according to the present invention is applied to a television will be briefly described with reference to FIG. For L ¥1.

35 is a receiving antenna, 56 is a tuner, and 37 is an A/D (analog-to-digital) converter that converts the selected video signal 'ffG, R, and B color-coded analog video signal into a digital signal.

This A/D converter was divided into 6 series.
This is to reduce the speed. 40 is a large display device according to the present invention, which can easily be 6×4. Or, it is indicated by the number of units of (jX2)X4. 39 is a large display device 4 that displays video signals for each color.
It is a memory means for storing one field or one frame of data corresponding to a series of 0's. 68 is a control circuit that refers to the vertical synchronization signal and horizontal synchronization signal and controls the A/D
The data stored in the converter 37 is controlled to be stored in the memory means 59, and the data in the memory means 39 is read out to the large display device 40 (3). The reason why the memory means 39 is used here is that the large display device according to the present invention has a serious drawback in the number of multi-presses that cannot be processed in real time. Calculate the capacity of memory 39.

480 (vertical) x 400 (horizontal) x 3 (color) x 5c step 1 bit) out of 64 bits x 27.

It is enough to use 27 bits of RAM for 64. (1) Recently, with the advancement of semiconductor technology, the cost has become cheaper year by year, so it is difficult to make it into a single problem. - As mentioned above, a unit that controls multiple pixels using a material with a galvanic effect that can control the amount of light transmitted, such as #crystalline?A large number of units are arranged to enlarge the image of each of these units. By filling in the blank spaces between each unit, it is possible to provide a large-sized display device that is f&<i type and has good cost performance by obtaining a high-quality screen, which is highly effective.

In other words, the projector can be replaced with an overhead projector, bringing about a revolution in the visual world.

[Brief explanation of drawings]

FIG. 1 shows a sectional view of an example of a large-sized display device that enlarges and projects images from a conventional cathode ray tube. FIG. 2 is a diagram showing a large-sized display device according to the present invention, in which (a) is a cross-sectional view of Fi, and (b) is a front view. No. 61 is a diagram showing an embodiment of a unit constituting a large-sized display device according to the present invention. FIG. 6(a) shows an example in which the necessary parallel beams are obtained by a flat light source in the unit. (
b) shows an example in which the necessary parallel rays are obtained in a unit using a point light source and a parabolic reflector, and (C) shows an example in which the necessary parallel rays are obtained in a unit by a rod-shaped light source spanning multiple units and a large number of light guide tubes. Figure 4 shows an example in which the display body for controlling the amount of light transmitted through the unit is made of a material having an electro-optic effect, such as liquid crystal. FIG. 5 shows a block diagram when the large-sized display device according to the present invention is applied to a television. Applicant: Epson Corporation Agent Tsutomu Mogami 57 Item 1

Claims (1)

[Scope of Claims] 1) A parallel light source generating means, a light source coupling means that uses the collimated light source generating means together, individually, or even partially, and electro-optically converts a plurality of pixels by optical passive elements such as liquid crystals. an opening/closing means that opens and closes the opening/closing means; a pixel forming unit passing through the opening/closing means and extending from the enlarging means for enlarging one surface of 7jLit; a supporting means for aligning and supporting a plurality of the picture accumulation forming units;
To form a natural large screen by configuring the pixels of the purple forming unit or the frame 1) that projects the 11 plane.
A large display device that shows percentages. 2) The large display device according to claim 1, wherein the enlarging means (#) is preferably a concave lens molded from plastic or a Fresnel lens. 6) The parallel light source generating means is 3. The large-sized display device according to claim 1, wherein the large display device is a flat light source that emits light by exciting a fluorescent film coated on a flat surface with thermoelectron or ultraviolet ray generating means. 4) The first aspect of the present invention is characterized in that the parallel light source generating means is preferably composed of a point light beam of a filament lamp, an animal reflector, and a filter that makes the light near natural light.
The large display device according to Items 1 and 2. 5) The parallel light source generating means uses a rod-shaped light source 1 reflecting mirror extending in the row or column direction of the pixel forming units, or the length of the opening and light guide tube used in combination with the reflecting mirror, or independently. The main feature 1 according to claims 1 and 2, characterized in that the ratio is sufficiently thick and a large number of light guide tubes are constructed.
Display device.