CN1779557A

CN1779557A - LED projector

Info

Publication number: CN1779557A
Application number: CNA200410097271XA
Authority: CN
Inventors: 王青山
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-11-21
Filing date: 2004-11-21
Publication date: 2006-05-31

Abstract

A LED projector is featured as forming a scan display unit by multiple LED utilizing digital technique to carry out combined grey scale modulation of dynamic grey scale and fixed grey scale for display unit and distributing grey scale signal as per multiple LED scan time-sequence, forming light beam array by multiple display units and using lens set to focus array light beam for carrying out scanning and displaying of image.

Description

A kind of LED projector

One, technical field: the present invention relates to a kind of LED projector

Two, technical background: known fine scanning technology adopts laser to carry out Projection Display as scanning light source, because light source cost height is difficult to carry out.Ultra-high brightness LED is as cheap light source, and its spectral purity is only second to semiconductor laser, fails to be applied as scanning light source because can not produce reasons such as collimated light beam, single brightness be relatively low through lens.

Three, summary of the invention: technical matters to be solved is: the Projection Display of how LED (referring to ultra-high brightness LED and LED class light-emitting component) being carried out image as scanning light source.Solution is: with the display unit of many transversely arranged composition scanning of LED delegation, a plurality of display units are vertically arranged the formation beam array, perhaps many LED light beams are imported an optical fiber, a plurality of fiber-optic output mouths are arranged formation light beam (battle array) row, perhaps a plurality of LED light beams (battle array) row are stitched together (battle array) row in the virtual image by direct reflection, form light beam (battle array) row of splicing, light beam (battle array) row adopt digital technology to drive, scanning sequence distributing signal by a plurality of LED in each display unit, and the mode of using fixing gray scale to combine with dynamic gray scale carries out gray modulation, and focusing of the light beam of modulation (battle array) row scioptics group and deflection mirror surface carry out the scanning demonstration of image.(as Fig. 1)

Beneficial effect: (1) uses LED as scanning light source, has reduced the light source cost significantly, is beneficial to universal.(2) use the LED beam array, high brightness can be provided.(3) use catoptron that a plurality of light beams (battle array) are listed in the virtual image and splice, can reduce the height of light beam (battle array) row, help in small projector, being provided with.

Four, description of drawings:

Fig. 1: array scanning device; Fig. 2: direct reflection forms light beam (battle array) and lists intention; Fig. 3: direct reflection forms the connecting method of array; Fig. 4: a plurality of light-emitting components are formed the gray modulation synoptic diagram of a display unit.

Wherein: 1, a plurality of light-emitting components (LED) of arranging along the direction of scanning; 2, light beam (battle array) row are dwindled preceding group of lens of focusing; 3, concavees lens; 4, field lens; 5, deflecting element; 6, projection lens; 7, on screen, pixel is carried out a plurality of scanning spots of gray scale scanning; 8, light source (battle array) row; 9, the light source in the virtual image (battle array) row; 10, minute surface; 11, signal allocation time-delay sequential.

Five, embodiment:

1, the gray modulation of display unit: with 256 grades of gray scales is example.The a plurality of LED that form R, G, B three-primary colours are along the direction of scanning series arrangement, and each look adopts the LED of 8 brightness unanimities.With code translator the eight-digit binary number signal of importing is translated into the dynamic gray scale of the first five bit representation 0-31 level, 12 binary signals of 0 grade or the 32 grades gray scale of corresponding 7 LED of back 7 bit representations, in video shows, picture generally is made up of the pixel of low key tone, back 7 signals that use in low middling brightness and gray scale are intersected establishment at the grey scale signal of medium above brightness use, heating when reducing led array with the tube core dense arrangement is concentrated), the first five input gray level modulator is carried out gray modulation, and the gray scale serial code of output is transported to first LED and is shown.Back 7 bit parallels deposit shift register or storer in, be provided with by difference and corresponding LED to be shown carry out signal lag (as Fig. 4) the bank bit of each signal, with demonstration and the scan-synchronized that guarantees 8 LED, R, G, 24 LED of B three-primary colours press scanning sequence and show, realize the gray modulation of 24 LED to a plurality of pixels in a plurality of pixels in the sweep trace.Shared one group of code translator of a plurality of display units and gray scale modulator (R, G, B), and by the gray modulation of signal reallocation realization to a plurality of display units.

2, the arrangement of array: the fiber-optic output mouth of a plurality of LED or importing led light source is arranged along the direction of scanning, form a scanning display unit, a plurality of scanning display units are vertically arranged, form array, also can require with reflecting array in the virtual image with the image planes of a plurality of arrays according to back group lens, be stitched together (as Fig. 2), form the array on different curve or plane.To dwindle vertical height (using) of array in small projector, because the width difference of array, splicing has three kinds of modes in the virtual image, and as Fig. 3, wherein A is suitable for wide array splicing; B is the splicing of medium-width array; C is the splicing of narrow array or light beam row.Simultaneously, for making things convenient for the setting of mirror surface, adjust the light output direction of array, (∠ a) and select the little LED of light output angle (in 15 °) for use to make the beam edge of each array have certain included angle, for guaranteeing a plurality of scanning spots after lens combination, the track of scanning spot is on a line, and each luminous point is arranged according to the conjugate points of desirable light spot position, interval between each luminous point and order are pressed the signal sequence setting simultaneously, to guarantee that a plurality of luminous points are at the scanning position of different time to a pixel.In addition, select the little LED of light shooting angle for use, and organize lens to reduce the bore of back group lens behind the directive at a certain angle.When led array is set, a plurality of LED tube core opsition dependents are required to be packaged together (or being bonded on the copper sheet), formation light beam row, again a plurality of light 0 bundle row are arranged in and form beam array together, folder people sheet copper is in order to heat radiation between the light beam row, also the LED light beam that is provided with in the circuit board can be imported optical fiber, the fiber-optic output mouth be arranged formed array.

3, light beam (battle array) row lens combination: select for use lens combination that beam array is dwindled focusing with certain reduction magnification, and before the image planes of dwindling, concavees lens are set, to prolong focal length, the dispersion angle of light beam after focus diminished, the place is provided with field lens in image planes, make an outer light beam deviation on a hot spot, and in the place's deflection of minimum hot spot.

4, mirror drum: select the subarea-scanning mirror drum for use.

5, projection lens: select the approximate projection lens of curvature of the image and subarea-scanning image planes.

Claims

1, a kind of LED projector comprises the signal allocation drive system, light source, lens combination, and light deflection element, projection lens is characterized in that light source is LED light beam (battle array) row.

2, by the described a kind of LED of claim 1 projector, it is characterized in that existing light beam (battle array) is listed as the lens combination of dwindling focusing, and have field lens at the image planes place that dwindles, and the minimum hot spot place's deflection that forms after to axle outer light beam deviation of deflection minute surface mirror on the scene.

3, the gray modulation method of forming a scanning display unit by a plurality of light-emitting components, be to modulate with the gray scale serial code, it is characterized in that signal is translated into the fixedly multidigit binary signal of grey scale signal of expression corresponding light-emitting component 0 one n levels dynamic gray scale and 0 grade of the corresponding light-emitting component of expression and n level, and signal is failed firmly each light-emitting component by the scanning sequence of corresponding light-emitting component.

4, light beam (battle array) row generation type comprises a plurality of display units, it is characterized in that by minute surface the reflection of (battle array) row light beam being listed in a plurality of (battle arrays) being stitched together in the virtual image.