CN1025098C - Large television display system - Google Patents
Large television display system Download PDFInfo
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- CN1025098C CN1025098C CN 90108230 CN90108230A CN1025098C CN 1025098 C CN1025098 C CN 1025098C CN 90108230 CN90108230 CN 90108230 CN 90108230 A CN90108230 A CN 90108230A CN 1025098 C CN1025098 C CN 1025098C
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- crystal apparatus
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Abstract
The present invention provides a projection system with small volume and low cost, which can project large and bright television images to a screen. A small-sized liquid crystal device is excited by a video signal to generate a transparent pattern which is arranged similarly to television images; light is projected to the back surface of the liquid crystal device to irradiate the device; a projection lens positioned in front of the device can project the image on the device to a large-sized screen. A grille in the liquid crystal device can be filtered by a spatial filter, and comprises negative patterns of gate Fourier variation.
Description
The present invention relates to a kind of large-scale tv and video image display systems.
By projection, television image can be projected in the large-scale screen for many people and watch simultaneously and need not build a large-scale cathode ray tube the video or television image.Before this can be very expensive for the projection television system that everybody utilizes.A kind of low cost and only need to revise a little in existing part or existing science and technology and build to show the system of TV or image that computer is produced should have significant values.
Purpose of the present invention just provides a kind of like this large-scale tv and video image display system.
According to one embodiment of present invention, can obtain a kind of television image to be projected low-cost system in the screen.Native system comprises a liquid-crystal apparatus, and it has comprised many picture points.These picture points are by its transparency of controlling electric energy.This liquid-crystal apparatus is to provide energy by a video signal generation circuit, and it makes picture point produce the transparent pattern of representing television image.A light source of the present invention can be incident upon photoconduction the back side of this liquid-crystal apparatus; Other has a projecting mirror that is positioned at this liquid-crystal apparatus the place ahead, the image of this liquid-crystal apparatus can be incident upon in the screen.
The present invention can utilize the small-sized liquid-crystal apparatus of a minitelevision, and this liquid-crystal apparatus is to utilize the video signal generation circuit of this minitelevision to encourage.This liquid-crystal apparatus is put into slide projector and the television set image is projected in the screen is possible.
The most of opaque grid of liquid-crystal apparatus can utilize a spatial filter to give filtering.Spatial filter is a negative film of grid fourier-transform.Projecting mirror produces the image of liquid-crystal apparatus at the image position place between projecting mirror and screen.Spatial filter just hereinto between the image position place.In claims of present patent application, narrated each new equipment of the present invention respectively.Be fully to understand the present invention, please refer to following accompanying drawing when reading following explanation.
Fig. 1 is the simplified side view according to television image projection system of the present invention.
Fig. 2 is a projection television image perspective view of improved slide projector in addition.
Fig. 3 is the part amplification profile of Fig. 1 television image projection system liquid-crystal apparatus.This figure has represented this TV projection system existing part in prior art.
Fig. 4 is the part front elevation of Fig. 3 system.
Fig. 1 illustrates and is used for large-scale tv image 12 is projected a system 10 in the large-scale screen 14.This television image projection system has comprised a liquid-crystal apparatus 16, and this liquid-crystal apparatus is encouraged by a video signal generation circuit, is subjected to encouraging the back can produce on liquid-crystal apparatus 16 and the corresponding transparent domain of television projection.Light source by a bulb 22, speculum 24 and collector lens 26 are formed can be incident upon photoconduction the back side of liquid crystal system and shine this liquid-crystal apparatus quite equably.An infrared filter 31 will help to protect this liquid-crystal apparatus to avoid overheated.Be positioned at a projecting mirror 32 in liquid-crystal apparatus the place ahead, the image of this liquid-crystal apparatus 16 can be thrown and gather in screen 14.
Liquid-crystal apparatus 16 and video circuit 18 are parts of commercially available small-sized or " pocket TV " television set.For example Radio Shaok LCTV Realistic Pocketvision just has the screen of a 5.4cm * 4.4cm, and this screen has the liquid crystal picture point of 146 row, 120 row.Each picture point all is positive square, and every limit length of side of this positive square is 370 μ m.This small-sized liquid crystal TV set also has one and can receive the receiver of broadcast television signal and the video pump circuit of excitation liquid-crystal apparatus.The initial design purpose of this minitelevision, be under the situation at the irradiate light liquid-crystal apparatus back side around for this liquid-crystal apparatus of individual direct viewing.Applicant has utilized this small-sized liquid-crystal apparatus to create one can watch the large-scale tv image simultaneously for many people.Its method is that very bright light is projected to and passes liquid-crystal apparatus, forms a large-scale projection image in screen.
Fig. 2 illustrates a kind of image projection system.This kind projection system has utilized Kodak Carousel1 or other slide projector 42, image on the liquid-crystal apparatus 16 is projected in the screen, the size of liquid-crystal apparatus 16 and the lantern slide that can be projected big or small the same, this liquid-crystal apparatus is placed in the projected position or projection film gate 44 places of this lantern slide projection's machine.The device that is positioned at projected position 44 must be done some modification, makes it can accept a special liquid crystal indicator.This liquid crystal indicator may be thick wideer than lantern slide.Lantern slide comprises a cardboard system clamper and a positive.Video circuit 18 is positioned at outside lantern slide projection's machine, receives this liquid-crystal apparatus with the ribbon cable that can destroy or force to yield entirely.Utilize this shadow casting technique, more existing slide projector done this modification slightly, can with one greatly and clearly television image project in the screen.Applicant has been utilized a kind of generic person, and television image projects in the screen for the slide projector of overhead type projector is incited somebody to action greatly clearly.This overhead slide projector has a horizontal surface, can place lantern slide or slide thereon, and wherein the projection of the image of slide will adopt additive method to carry out.
We find through energizing and the more opaque above-mentioned television set picture point that becomes still can transmit on a small quantity but the light that still can aware.Therefore the brightness of light should limit, to avoid " washing off ".Approximate when utilizing the brightness that CTR optical projection system back projection screen prjection obtained in brightness, can obtain 10: 1 to 20: 1 contrast, brighter contrast also can improve by the improvement to LCD TV.
According to the image of aforesaid way institute projection, and unsatisfactory.Because the black grid overlapping can occur with projection image.Fig. 3 illustrates some image details of liquid-crystal apparatus, and these images just have this grid.This liquid-crystal apparatus comprises that one deck is folded in liquid crystal material 50 between a pair of glass plate 52.54, and this then is folded between the Polarizer 56,58 glass plate.Has orthogonal conductor 60,62 in these two glass plates.When not between the electric wire 61,63 that joins with these two conductors during making alive, picture point institute making alive is 0 volt, thereby the liquid crystal region that is positioned at the crosspoint will become transparent.Conductor 60,62 intersects to form a picture point, shown in 64 in Fig. 4.Although all holostrome conductors itself all quite transparent [with regard to black and white television set, quite transparent promptly refer to have approximately half incident light by], therefore conductor 60,62 not overlapping is opaque, forms grid.These opaque grids [in above-mentioned television set, when its width is about one thousandth] can become very showy when the big and bright image of liquid-crystal apparatus is projected in the screen.
Applicant has been utilized such as a spatial filter filtering shown in 70 among Fig. 1 this comb mesh pattern.This spatial filter 70 constitutes bright, a dark areas pattern that is essentially liquid-crystal apparatus comb mesh pattern 66 fourier-transforms, it is placed in 72 places, intermediate imagery position, and this intermediate imagery position 72 is between projecting mirror and screen, after the light process calibration by liquid-crystal apparatus, position 72 is exactly its focal length to the distance of projecting mirror 32.Fig. 5 is the overall pattern of spatial filter, and it illustrates spatial filter and comprises the zone of opacity 74 that several represent grid fourier-transform negative film.May comprise a polymer plate or a glass plate that scribbles sensitising agent on it to unexposed this film of film 90[] be put in position 72[but do not have filter 70 between emptying herein], just can utilize the system construction spatial filter 70 of Fig. 1.The operation liquid-crystal apparatus makes all picture points all become transparent [obtaining by not applying any formation image], allows the light from source 20 that film is exposed.If the emulsion that is coated on the film 90 is a negativity, it can make bright spot deepening dim spot brighten after flushing, film 90[after the flushing and its copy] just can be used as space filtering.If the emulsion that is coated on the film 90 is a positivity, then available its negative film.We can see that if calibrated the light 90 that passes through liquid-crystal apparatus 16, this moment, spatial filter 70 was exactly the fourier-transform of grid.
Liquid-crystal apparatus 16 as lattice can addressing to control the transparency of each picture point or picture point lines.When the device of the vision signal that produces the expression image [this signal can be energized as lattice] comprised television broadcast receiver or television camera, we also can produce image with computer.These images are local [Non-Broadcast Multicast Access] and field images not necessarily of producing.Though what applicant was throwed is monochrome or black-and-white image, we show chromatic image by an also available color liquid crystal device.Use this device, each picture point can only be by a kind of color [for example: blue, red or white]; And available white light shines.Therefore, this cover system provides a kind of economic system that big and bright image is projected screen; A kind of cost effective method that is produced big and bright image by small LCD [LCD] TV also is provided simultaneously.The back side floodlighting of this liquid-crystal apparatus; Projecting mirror in this liquid-crystal apparatus front can be thrown the image of this liquid-crystal apparatus in screen.Appear at the imagery coverage in the screen, be big at least 1 order of magnitude of area than liquid crystal display more satisfactoryly; More desirably be more than big two orders of magnitude [100 times].This liquid-crystal apparatus has the grid that opaque lines are formed.Can utilize one basically for this reason the spatial filter that negative film constituted of grid fourier-transform it is filtered out.
Though only narrate and illustrate several specific embodiments of the present invention,, can make the modification of doing according to the present invention easily herein for the colleague.Therefore, applicant thinks that following claim should comprise these modifications.
Claims (13)
1, a kind of TV and video image are projected the system of screen, comprising:
A liquid-crystal apparatus that comprises many enrank picture points, each picture point all can be controlled its transparency by energizing, two sides before and after described liquid-crystal apparatus has;
Produce the generating apparatus of the vision signal of expression image, described generating apparatus is connected with the described picture point of energizing with described liquid-crystal apparatus, makes its transparent pattern with described image corresponding;
It is characterized in that:
Light can be led the light source that is incident upon the described liquid-crystal apparatus back side for one, lead the light of penetrating, can penetrate the picture point on the liquid-crystal apparatus along direction forward;
A projecting mirror that is positioned at described liquid-crystal apparatus the place ahead, described projecting mirror focuses on described zag image point patterns in position and images in the screen.
2, the described optical projection system of claim 1 is characterized in that:
Described liquid-crystal apparatus contains a kind of grid, and this grid is made of for opaque ranks substantially many, and these conductors all extend by the direction of described picture point ranks,
The image of described projecting mirror on the described liquid-crystal apparatus of formation on the mid-plane between projecting mirror and the screen,
A spatial filter that is positioned at described mid-plane, described filter can form and be the light and shade zone map of described grid fourier-transform substantially.
3, the described optical projection system of claim 2 is characterized in that: described space filtering is the picture point of all liquid-crystal apparatus forms image when transparent in described centre position through energizing a negative film.
4, optical projection system described in the claim 1 is characterized in that:
One has the slide projector that is called the film door gear, generally the slide that is projected is placed on this film door place, this slide projector also has a light source, can impinge upon described transparent position also can form a slide in described film door assembly image, and it is projected in the screen.
5, the described optical projection system of claim 1 is characterized in that:
Described liquid-crystal apparatus and described generating apparatus have been formed the display of minitelevision and the exciting circuit of this minitelevision.
6, system described in the claim 1, its feature also is: the screen that this described liquid-crystal apparatus area big of area arrives several orders of magnitude, described screen and described liquid-crystal apparatus lay respectively at the both sides of described projecting mirror, described projecting mirror design to such an extent that can in described screen, form an image, this image occupies most of screen.
7, a kind of TV and video image are projected to method in the screen, it is characterized in that:
With liquid-crystal apparatus of rayed, this piece liquid-crystal apparatus has comprised many picture points, and these picture points all can be energized and be controlled its transparency; With the vision signal suitable described liquid-crystal apparatus is energized, thereby produce the transparent zag image point patterns consistent, thereby the image of described liquid-crystal apparatus can be formed in the screen with described image with image.
8, method as claimed in claim 7 is characterized in that:
Described illumination and the step that forms image are included in described liquid-crystal apparatus back and lead and penetrate light and the guide lights step by the projecting mirror of described liquid-crystal apparatus.
9, the method described in claim 7 is characterized in that:
Described liquid-crystal apparatus has many opaque substantially grids, and these grids are positioned at described liquid-crystal apparatus and form a transparent pattern, and the step of described guide lights comprises the image of above-mentioned liquid-crystal apparatus is formed in a locus between projecting mirror and the screen,
Put a spatial filter in described interposition, it is the light and shade district figure of the fourier-transform of described opaque pattern that this spatial filter can form expression basic.
10, method described in the claim 7 is characterized in that:
Described liquid-crystal apparatus comprises many basic for opaque and be placed on the conductor that can form pattern in the described liquid-crystal apparatus.
The step of described guide lights is included in the image that forms described liquid-crystal apparatus between projecting mirror and the screen,
At the spatial filter in described centre position, this spatial filter is equivalent to the negative-appearing image of image in described position intermediate when each picture point is transparent.
11, the method described in the claim 7, its feature also is:
The LCD and the reception of minitelevision are separated with exciting circuit, can make facial no any dried the scratching of LCD; Utilize described reception and exciting circuit to finish the step of the described liquid-crystal apparatus of excitation simultaneously.
12, the method described in the claim 7, its feature also is:
The step of described irradiation and projection is included in the LCD that a small electrical visual organ is settled in the slide projector position, lays light source and projecting mirror respectively on the both sides of this slide projector projected position.
13, the system described in the claim 7 is characterized in that, this system can be used for the large colour projection TV.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90108230 CN1025098C (en) | 1990-10-04 | 1990-10-04 | Large television display system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90108230 CN1025098C (en) | 1990-10-04 | 1990-10-04 | Large television display system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1060753A CN1060753A (en) | 1992-04-29 |
| CN1025098C true CN1025098C (en) | 1994-06-15 |
Family
ID=4880899
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90108230 Expired - Fee Related CN1025098C (en) | 1990-10-04 | 1990-10-04 | Large television display system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1025098C (en) |
-
1990
- 1990-10-04 CN CN 90108230 patent/CN1025098C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1060753A (en) | 1992-04-29 |
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