CN2105154U - Display apparatus of projecting television - Google Patents
Display apparatus of projecting television Download PDFInfo
- Publication number
- CN2105154U CN2105154U CN 90204685 CN90204685U CN2105154U CN 2105154 U CN2105154 U CN 2105154U CN 90204685 CN90204685 CN 90204685 CN 90204685 U CN90204685 U CN 90204685U CN 2105154 U CN2105154 U CN 2105154U
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- liquid crystal
- electrode
- light
- supporting bracket
- display unit
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Abstract
The utility model discloses a projection television set utilizing liquid crystal display, which is provided with two transparent supporting plates, wherein, the supporting plates are provided with transparent electrodes. A liquid crystal material layer is arranged between the two plates. Electrodes are respectively scanned by an electron gun and a field scan generator. The scanning of the electron gun causes the liquid crystal actions to generate images. A light generated by a light source is modulated, which is magnified conveniently into television images. The utility model eliminates semiconductor matrix switch elements, adopts a light direct projection type, and has the advantages of simple light path, no loss of light, simple and compact structure and clear images.
Description
The present invention relates to projection TV, specifically a kind of device that utilizes the scanning liquid crystal display.
Existing projection TV generally adopts the high brightness picture tube, its cost of manufacture height, and volume is big.For color projection TV, red, green, Lan Sanse need divide three tunnel outputs, converge to imaging on the screen at last, therefore its structure is also comparatively complicated, direct-injection type projection TV with LCDs is made because switch element is opaque, has taken image area, the coefficient of transparency of light is reduced significantly, generally only is about 40%.The CN88104512 patent is a kind of projection TV that utilizes LCDs to make.In this patent, in order to solve the problem that has reduced transparent rate because of switch element is opaque, adopted the method for reflection-modulation-imaging, be about to light from the positive incident of LCDs and the imaging that is reflected out, so theoretically at the switch matrix circuit of LCDs back to light just without any having stopped.In order to realize the imagination of above-mentioned light from positive incident, need and will pass through primary event more from the light that light source sends, light path is actual like this is " Z " font, and light is lost on the one hand, and dwindling of device volume also has been subjected to certain limitation on the other hand.
In the projection TV described in existing and the above-mentioned patent documentation, the imaging of LCDs is all controlled visual electrode drive pixel by switch element and is shown.Because pixel has hundreds of thousands on a panel, corresponding switch element also has so huge number, therefore inevitable very high, the complex structure of the cost of device, and reliability reduces.
Purpose of the present invention just provides a kind of display unit that can overcome above-mentioned deficiency effectively, and this installs dull thread loss in fact, and can show change picture rapidly in time.
The present invention is achieved in that liquid crystal indicator has two transparent supporting brackets, and at least one transparent electrode is arranged on each supporting bracket, between two supporting brackets, has installed liquid crystal material layer; Electrode on two supporting brackets comes scan control by field scan generator and electron gun respectively, and the light of light source is modulated the back with the projection pattern imaging by liquid crystal.
One of two supporting bracket are wide slightly, and one high slightly, when two plates have stacked one group of adjacent side when overlapping alignment, a projection is arranged respectively, and field scan generator and electron gun are just to the scan control respectively of the electrode on two projections.
Liquid crystal material layer adopts the good iron of response characteristic-electrical nematic liquid crystal, and makes liquid crystal optic axis parallel with the supporting bracket face.Electrode on two supporting brackets is orthogonal, its intersection point constitutes a pixel, when the electrode on two supporting brackets is scanned connection respectively, its intersection point place produces potential difference owing to the voltage that is applied is different, when this difference surpasses the threshold value of liquid crystal action, then liquid crystal action sees through with regard to the light that light source is arranged on this pixel, and last light is modulated into picture through liquid crystal.
The present invention can be amplified image by modulate the light that a high light light source sends with liquid crystal simply.Edge by scanning liquid crystal indicator two supporting brackets makes the display unit imaging.Saved all semiconductor matrix switch elements on the one hand, reduced cost, simplified the structure, improve reliability, blocked because of no switch element and electron gun on the LCDs on the other hand, can adopt the light direct-injection type, light path is simple, and light is free of losses in fact.For the liquid crystal indicator that switch element is arranged, image transform always includes a switching time, and the present invention has saved switch element, therefore do not had switching time, image transform only is subjected to the influence of scanning frequency, therefore, along with the increase of frequency, can show change picture rapidly in time.Particularly to the quick variation of image or under higher picture frequency situation, the present invention will be more practical.
Below in conjunction with accompanying drawing the present invention is further described.
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the pixel imaging schematic diagram that the present invention does colour projection.
As shown in Figure 1, transparent support plate is selected glass plate for use, produce 625 transverse electric utmost points with SnO2 on glass plate 1, these electrodes are by the field scan generator 3 constant voltage of sequential scanning (or interlacing scan) in addition, and scanning frequency is determined by the TV Field vertical synchronizing signal.Produce the transparent perpendicular electrode of 800-3000 bar on glass plate 2, the lower end of perpendicular electrode is connected in parallel and ground connection by the identical resistance R of resistance, and its upper end applies the signal voltage that changes with picture intelligence by electron gun 4 scannings.The resistance of resistance R should be as best one can little, to reduce interelectrode electrostatic capacitance.Accompany iron-electric nematic liquid crystal between two glass plates, the optical axis of liquid crystal is parallel with glass-board surface.Can add transparent insulating layer between liquid crystal material layer and the glass plate, in case liquid crystal is in the electric field action current downflow.Anyhow electrode is vertical mutually, and LCDs can be 3 * 4cm
2
Behind the next visual signal of telecommunication of antenna reception, through control circuit, signal voltage is added on the electron gun, electron gun begins the perpendicular electrode on the rapid scanning glass plate 2 upper end projections, this moment is under synchronous circuit control, the field scan generator scanning first row transverse electric utmost point (glass plate 1 left end projection), the liquid crystal on the pixel that each crosspoint constitutes are according to the difference of signal voltage and corresponding actions makes each pixel produce the different bright spot of light and shade.After electron gun had been swept perpendicular electrode, field scan generator was connected next transverse electric utmost point, and electron gun begins to scan perpendicular electrode heavily again one time.Within 20 milliseconds, scanned a frame, form a complete image, this image through lens 6,7, amplifies imaging on screen 8 after being shone by light source 5 at last.For guaranteeing the generation of image, avoid the misoperation of liquid crystal, the perpendicular electrode potential that the transverse electric electrode potential of having connected is higher than connect, perpendicular electrode potential is higher than the cathode potential in the electron gun, i.e. U
Horizontal＞U
Perpendicular＞U
CloudyElectron gun 4 is because of only carrying out transversal scanning to the upper end of perpendicular electrode, need not apply vertical deflecting voltage on the electron gun, so electron gun can be placed position with glass plate 2 upper end projection maintenance levels, thereby get out of the way LCDs is whole, the irradiate light that makes light source is on the view picture LCDs.
Colour is shown, still is 625 transparent transverse electric utmost points on the glass plate 1, produces 800 * 3 transparent perpendicular electrodes on the glass plate 2, the highlyest makes 1000 * 3 perpendicular electrodes.Protrusion position in glass plate 2 upper ends, one group of per three strip electrode, corresponding of contacting respectively among three square electrodes 9 that are vertical arrangement.Line between perpendicular electrode and the square electrode is handled through insulation.All perpendicular electrodes are by resistance R ground connection in parallel.Produce red, green, blue alternate transparent colour bar at the back side of glass plate 2, colour bar is corresponding one by one with positive perpendicular electrode, and length and width are identical or slightly wide.Three intersection points of three perpendicular electrodes that this moment is corresponding red, green, blue and each transverse electric utmost point constitute a pixel, as shown in Figure 2.Protrusion position in glass plate 2 upper ends, three square electrodes of every group of perpendicular electrode upper end are scanned respectively by three electron guns, and the signal voltage of red through resolving into, green by the signal voltage of being accepted, blue three pigments of the scanning voltage of three electron guns is determined.Under synchronous circuit control, three electron guns scan three square electrodes of one group of perpendicular electrode upper end simultaneously, and the pixel liquid crystal action that the intersection point of the transverse electric utmost point of a corresponding connection constitutes forms a synthetic colored bright spot.One frame scan finishes and just constitutes a chromatic image, by light source projects imaging to the screen.
The present invention does the colour display device time spent, red, green, blue three electrodes are dissolved on the transparent support plate, and only use a light source, than also converging this structure at last with three light sources, red, green, blue three figure panels that show respectively, structure is to have simplified widely, and electrode is wide to can be 1 micron, can satisfy the requirement of high definition.In this device, three electron guns are because of only carrying out transversal scanning to the square electrode on the perpendicular electrode, and making three-gun does not need vertical deflecting voltage, and has only lateral deflection voltage to get final product.As replacing three rifles with single rifle, color flicker problem can appear then herein.This device machine volume can be at 25 * 10 * 20cm
3In the scope, become portable, easily accepted by people.
Claims (5)
1, a kind of display of projection TV set, comprise light source 5, the light of light source is incided a liquid crystal indicator, this liquid crystal indicator has two transparent supporting brackets 1,2, at least one transparent electrode is arranged on each supporting bracket, between two supporting brackets, installed liquid crystal material layer, it is characterized in that supporting bracket 1 to be wider than supporting bracket 2 and be lower than supporting bracket 2, when two supporting brackets have one group of adjacent side coincidence alignment to stack, one projection is respectively arranged, and field scan generator and electron gun are distinguished scan control over against the electrode on two projections.
2, display unit according to claim 1 is characterized in that 625 transverse electric utmost points are arranged on the support plate 1, has the 800-3000 bar to erect electrode on the support plate 2.
3, display unit according to claim 2 is characterized in that 800 * 3 perpendicular electrodes are arranged on the support plate 2, the protrusion position in glass plate 2 upper ends, and one group of per three strip electrode, correspondence contacts among three vertical square electrodes of arranging 9 of one-tenth respectively.
4, display unit according to claim 1 is characterized in that liquid crystal material layer is made up of iron-electric liquid crystal, and its optical axis is parallel with the supporting bracket face.
5, it is characterized in that according to claim 1,3 or 4 described display unit the electrode on two supporting brackets is orthogonal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90204685 CN2105154U (en) | 1990-04-12 | 1990-04-12 | Display apparatus of projecting television |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90204685 CN2105154U (en) | 1990-04-12 | 1990-04-12 | Display apparatus of projecting television |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2105154U true CN2105154U (en) | 1992-05-20 |
Family
ID=4885605
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90204685 Granted CN2105154U (en) | 1990-04-12 | 1990-04-12 | Display apparatus of projecting television |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2105154U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102147374A (en) * | 2009-10-28 | 2011-08-10 | 康宁股份有限公司 | Off-axis sheet-handling apparatus and technique for transmission-mode measurements |
-
1990
- 1990-04-12 CN CN 90204685 patent/CN2105154U/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102147374A (en) * | 2009-10-28 | 2011-08-10 | 康宁股份有限公司 | Off-axis sheet-handling apparatus and technique for transmission-mode measurements |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |