CN1979248A

CN1979248A - Multi-point scanning projector

Info

Publication number: CN1979248A
Application number: CN 200510111270
Authority: CN
Inventors: 刘晓松
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-12-08
Filing date: 2005-12-08
Publication date: 2007-06-13

Abstract

The invention belongs to the technical field of multipoint scanning projector. The existing projectors are divided into three series of: LCD (Liquid Crystal Display), DLP(Digital Lighting Process) CRT(Cathode Ray Tube) projectors. But they all have more shortages. And the invention utilizes a truly original scanning technique to radically overcome the shortages in the existing techniques; and provides an effective solution to the next generation projection display devices with high brightness, high definition and high color expression and low cost, low noises and low power consumption.

Description

Multi-point scanning projector

One, technical field: the invention belongs to the giant-screen multi-point scanning projector.

Two, background technology: at present except three traditional rifle CRT shadow casting techniques, present various projectors are based on all that four kinds of technical developments get up.These four kinds of technology are LCD, DLP (core video picture device is DMD), D-ILA (LCOS) and GLV.LCD projector distinct disadvantage is that the performance of black level is poor, and contrast is not very high, the visible dot structure of picture displayed, and the life-span of bulb is limited.Also there is the life problems of bulb in DLP, also has " rainbow effect " simultaneously.The LCOS black and white contrast is not good, three-chip type LCoS light engine volume is bigger, and owing to must under polarized light state, work, so high especially to each device mounting accuracy requirement in the light path.GLV is the abbreviation of " Grating Light Valve " (palisade formula light valve), is a new technique, also has simultaneously more shortcoming, one, lack good LASER Light Source.Two, qualification rate is lower in batches for GLV.Three, the horizontal scanning imaging is difficult.At present that is that all right is ripe for this technology.

Three, summary of the invention: in order to solve the many shortcomings of existing projector, the purpose of this invention is to provide a kind of simple in structure, cost is low, overcome the large screen projection display technique of above many shortcomings simultaneously.

The technical solution adopted for the present invention to solve the technical problems comprises following components: R, G, B collection of simulant signal, R, G, B signal processing system, the row-field scanning drive system, light source forms device, a row vibration unit, projection lens, it is characterized in that: (1) utilizes digital technology that vision signal is carried out stored digital frame by frame, and by certain algorithm data is handled, and shows output simultaneously with multirow at last; (2) adopt micro-mechanical electromagnetic topworks that light signal is carried out row-field scanning; (3) make full use of a performance period characteristic of line scanning, reach half period and show the multi-frame video signal; (4) light source formation device is a line spread light source array, and its input light source can maybe can be modulated laser constitution by high brightness LED.Array forms device can realize (as Fig. 2) by scioptics, also can pass through optical fiber processing.This programme adopts high brightness LED to realize by compound lens.

The invention has the beneficial effects as follows: (1) overcomes the device cost that has projector's costliness now from cost, and the particular device of wanting required for the present invention is a micro-mechanical electromagnetic topworks (as Fig. 4); (2) in brightness because to have adopted high brightness LED be light source, can avoid the problem in existing projecting camera light bulb life-span, and increase substantially from serviceable life, brightness also can infinitely improve in theory simultaneously; (3) owing to be the spot scan system, can complete seamless demonstration between pixel and the pixel; (4) micro-mechanical electromagnetic topworks is conservative relatively in this usability selection, by improving, projector is improved largely on line number, columns, refresh rate; (5) the space current stacking method is adopted in color control, can make color abundanter, more true to nature.(6) display light source adopts the high high brightness LED of luminescence efficiency, because no high-power display light source, Overall Power Consumption is very little, does not also have the light source heat radiation problem simultaneously, and the total noise of centrifuge index is very low.(7) owing to be that spot scan reflection configuration contrast can design very desirablely.

Four, description of drawings:

Accompanying drawing one: 1, light source form device, and 2, the line scanning micromirror, 3, the field scan micromirror, 4, the projection lens group, 5, screen.

Accompanying drawing two: 1, long-focus convex lens, 2, short focal length convex lens.

Accompanying drawing three: signal processing system block diagram.

Accompanying drawing four: 1, miniature coils, 2, the high magnetic magnet steel of miniature sheet, 3, miniature movable contact spring, 4, miniature minute surface.

Accompanying drawing five: 1, the high magnetic magnet steel of miniature sheet, 2, miniature minute surface, 3, miniature movable contact spring.

Accompanying drawing six: 1, the high magnetic magnet steel of miniature sheet, 2, miniature minute surface, 3, miniature movable contact spring.

Five, embodiment:

The present invention is an example with computing machine VGA output signal, chooses 1024 * 768 pixels, refresh rate is that 60Hz, line frequency are the vision signal of 48.38KHz.For multi-point scanning projector can specifically be to show several points simultaneously according to the concrete condition selection according to cost and effect, this time chooses the n=8 that counts as example and analyzes;

1, vision signal is handled (as Fig. 3), road signal in the RGB tristimulus signals only is shown among the figure, video analog signal at first is converted to video signal through ADC, select a storage unit that video signal is stored by the control moderator, this moment, another road storage cell was read operation.That is: first frame data are stored among the RAM1, second frame data are stored among the RAM1 equally, are saved in the 8th frame data always, and the 9th frame data switch among the RAM2 to be preserved, carry out read operation to eight frame data of having preserved this moment, and show eight tunnel vision signals simultaneously in order.After the 16th frame signal finished, the 17th frame data switch to be saved among the RAM1 to be preserved, and carry out read operation to the 9th frame to the 16 frame data this moment, shows by showing.The similar frequency divider of control moderator, effect are to distinguish the first eight frame data and back eight frame data.Thisly can in the lossing signal data-signal not handled based on the double memory cell structure.Output buffer shows 8 frame data signals simultaneously by arbitration controller, and latchs to reach continuous display frame when no datat exported.Effectively reach the purpose that reduces line frequency by such method.Can utilize existing FPGA technology that above a plurality of devices are integrated in the chip technically, to reduce system cost.

2, the line frequency sweep test adopts micro-mechanical electromagnetic performer (as Fig. 4), scanning device is carried out one-period and is equaled the data that row shows 2 * 8 frames, concrete grammar is as follows, because TV generally is a simulated television, flyback upper thread among the CRT is unavailable, and invention this time utilizes FPGA that data are handled, and the flyback retrace line is utilizable.In preceding semiperiod vision signal is to show in order, is to show by backward at later half cycle video signal.Performer is carried out one-period and is equaled to have scanned twice, thereby reaches the purpose that reduces line frequency.Method according to twice frequency reducing is calculated, and wherein under the situation of n=8, drawing line frequency at last is 48.38KHz ÷ 8 ÷ 2=3.023KHz.Light reaches scanning imagery by (as Fig. 5) angle variation of miniature minute surface in the line scanning micro-mechanical electromagnetic performer.

3, the field frequency sweep test also adopts similar micro-mechanical electromagnetic performer, and just miniature minute surface has bigger difference (as Fig. 6) in mirror surface and line scanning machinery electromagnetic actuator spare, and the scan period is 60Hz.

4, light source formation device can adopt high brightness LED to reach 8 tunnel line spread (as Fig. 2) by compound lens, is to be example with n=8 among the figure.This invention has adopted high brightness LED as display unit, each road comprises RGB three look high brightness LEDs, that is: at first the directional light processing is carried out to high brightness LED output light in each road, scioptics one pool eight road light a bit, lens two are installed so that eight road light convert directional light in the focal length of lens with interior appropriate location, this directional light energy is more concentrated, and light path is more tiny, and this light exports on the miniature minute surface in the micro-mechanical electromagnetic performer.The color gray-scale Control adopts the method for space current stack, and this kind method is more direct, easy, only need do simple adjustment for the increase of brightness simultaneously and just can well improve projector's brightness.

5, micro-mechanical electromagnetic performer (as Fig. 4): mainly form by coil and the small sheet that shakes.The small chip architecture more complicated of shaking comprises: the high magnetic magnet steel of miniature sheet, miniature minute surface, miniature movable contact spring.By size of current in the control coil, and then reach the change of controlling miniature movable contact spring deflection angle, finally reach the change of the miniature mirror angle of control.The drive coil signal frequency is 3.023KHz in this invention, and shape can be thought the symmetric triangular ripple theoretically, because miniature movable contact spring physical characteristics is non-linear, concrete waveform can be a foundation by actual test data.Miniature movable contact spring is divided into miniature movable contact spring of line scanning (as Fig. 5) and the miniature movable contact spring of field scan (as Fig. 6) again in the micro-mechanical electromagnetic performer.

Vision signal finally reaches display frame through above processing, and by above change, the pixel frequency is 1/8th of original frequency, and line frequency is 1/16th of original frequency.The brand-new scanning technique of this programme utilization fundamentally overcomes the shortcoming in the present technology, and a kind of high brightness is provided, high definition, and high color expressive force possesses low cost simultaneously, low noise, the effective solution of the projection display apparatus of future generation of low-power consumption.

Claims

A kind of giant-screen multi-point scanning projector.Comprise: R, G, B collection of simulant signal, R, G, B signal processing system, the row-field scanning drive system, light source forms device, a row vibration unit, projection lens.It is characterized in that:

1, existence is used for the light source that multirow scans simultaneously in the system, and it is arranged in a straight line, structure such as Fig. 2., see through compound lens and form light beam as light source by high brightness LED.Also can adopt laser as light source, see through optical fiber or compound lens and carry out the light beam arrangement.
2, video signal processing method is characterized in that: subregion frame by frame, multichannel drive simultaneously by row and show that double memory cell is storage alternately, and preceding n frame sequential shows, back n frame backward demonstration.
3, micro-mechanical electromagnetic actuator is characterized in that: be made up of coil and the small sheet that shakes, by control input signals, reach control actuator central authorities micromirror angle and change.
4, line scan signals disposal route is characterized in that: make full use of the back and forth movement characteristic that the micro-mechanical electromagnetic actuator is carried out one-period, finally realize twice of a performance period scanning.