CN101217672B - A high frame rate, true color and high resolution projection display method - Google Patents
A high frame rate, true color and high resolution projection display method Download PDFInfo
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- CN101217672B CN101217672B CN2008100590639A CN200810059063A CN101217672B CN 101217672 B CN101217672 B CN 101217672B CN 2008100590639 A CN2008100590639 A CN 2008100590639A CN 200810059063 A CN200810059063 A CN 200810059063A CN 101217672 B CN101217672 B CN 101217672B
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- projecting apparatus
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Abstract
The invention discloses a novel projection display method which has high-frame rate, true color and high resolution. The novel projection display method takes advantage of binary-conversion feature of a high-frame rate and high resolution projection display system to lead the images of a plurality of projectors to be overlapped and carry out binary coding through light intensity and realize enlarging gray level on the basis of not lowering the frame rate of a single projector to achieve the true-color, high-frame rate and high-resolution projection display. The binary coding is the binary coding of light intensity of projector images, which not only can realize true color projection display but also can be extended to realize ultrahigh-frame rate and colorful projection display with higher chromatic number or gray level. The method of bit-combination colorized projection display provided by the invention can be used in DMD high-speed projection display with 8000Hz frame rate and gray binary system, the experiment testifies that an 8000Hz true-color and high-resolution projection display system can be formed as long as 8 projectors with the frame rate are utilized together.
Description
Technical field
The invention belongs to photoelectron Display Technique field, special photoelectricity Projection Display, three-dimensional display, body three-dimensional display and high frame frequency display, liquid crystal over silicon display, application scenarios such as digital micro-mirror display.Purpose is the projection display system that becomes binary digit gray scale or true color by the color projecting apparatus that optical encoding only has bright dark binary states during high frame frequency.
Background technology
An important trend of the development of modern dimension display technologies is exactly that true three-dimension shows, is the main flow that the true three-dimensional display of representative becomes development with the body three-dimensional display.In the body three-dimensional display, need at least 8000 to 10000 two field pictures each second, promptly need high frame frequency, high-resolution display, because showing, three dimensions needs a large amount of volume datas, therefore the current high frame frequency projection display is under the situation that satisfies the three-dimensional frame frequency demonstration of body, can't satisfy the demand that colour shows, so need a kind of projection display that can under the high frame frequency of maintenance, realize the true color demonstration of development.
On the other hand, pictcure generator, the particularly spatial light modulator of MEMs type that modern Projection Display is used, its modulation only have out and close two states, colored realization mainly is to rely on the switching speed of these spatial light modulators very fast, utilizes a plurality of switching pulses to produce gray scale.When the switching speed of spatial light modulator was slow with respect to application, we just can't adopt the umber of pulse of switch to carry out the method for gray modulation, otherwise will influence frame frequency, and influence is the effect of demonstration dynamically.Be subjected to the restriction of conditions such as technology, technology in MEMs response device speed and resolution, and can't realize under the situation of bigger leap, device itself has just limited its expansion on using.
The method that this just needs a kind of novel full color that the demonstration of using switch binary states spatial light modulator can be combined into the color gray rank with the frame frequency identical with the MEMs device and resolution to show, promptly under the situation that does not influence frame frequency number and resolution, utilize the spatial light modulator of switching mode to realize the method that full color shows.This patent is exactly a kind of switching mode spatial light modulator that utilizes high frame frequency that proposes at this demand, constructs the method for high frame frequency high-resolution true color Projection Display.
Summary of the invention
The present invention proposes a kind of high frame rate, true color and high resolution rate method for displaying projection.
High frame rate, true color and high resolution projection display method, utilize many projector scopes with pictcure generator (1) of light intensity binaryzation feature (1-1,1-2,1-3 ...), their image is overlapped fully on projection screen (3), and make light intensity that every projecting apparatus arrives the target area carry out optical encoding by 2 close power, form and have 2
nGray level image (n is an optical projection system platform number).
In like manner, during colored binaryzation optical projection system that every projecting apparatus is that three pictcure generators of red, green, blue (6,7,8) of light intensity binaryzation tag type constitute, their image is overlapped fully on projection screen, and make light intensity that every projecting apparatus arrives the target area carry out optical encoding by 2 close power, then every kind of color can form and have 2
nKind of gray scale can form altogether 2
n* 2
n* 2
nPlant the image of color.
Utilize projecting apparatus and spectroscope (2-1,2-2,2-3 ...) make up by spatial arrangement, the image of any projecting apparatus all passes through all spectroscopical refraction and reflections of its back, and the projected image that guarantees many overlaps on projection screen formation 2 fully
0, 2
1, 2
2, 2
3The light intensity combination that the geometric ratio rule changes.
For the conjugate distance that guarantees the branch platform is identical, can make identical identical realization of projecting apparatus projector distance in projecting apparatus and the spectroscopical combination of arranging; Also can make the projection lens focal length difference of every projecting apparatus and projecting apparatus is identical with spectroscopical distance realizes; Can also be at projecting apparatus under identical and projecting apparatus and the also identical situation of spectroscopical distance, each spectroscopical rear side adds a telephoto lens group (11) and realizes (last spectroscope rear side can add, and also can not add).
Projecting apparatus and spectroscopical combination of arranging, its spectroscope that uses in system has the semi-transparent semi-reflecting characteristic in visible region (410nm-690nm) broadband, i.e. 50% of wide spectrum neutral beam split.Pictcure generator can be spatial light modulator, as digital micro-mirror device (DMD), reflective liquid crystal spatial light modulator (LCOS) etc.
The high frame rate, true color and high resolution rate method for displaying projection that the present invention proposes can be not a cost to reduce the spatial light modulator frame frequency or to reduce pixel, makes combined system can obtain the Projection Display of the high-resolution true color of high frame frequency.
Description of drawings
The basic projection display system principle assumption diagram of Fig. 1 schematic diagram;
The spectroscope of two projecting apparatus of Fig. 2 synthesizes 4 GTG system diagrams;
Three projecting apparatus of Fig. 3 and spectroscope combination 3bits gray scale projection display system figure;
Fig. 4 n platform projecting apparatus and n spectroscope combination n bits gray scale projection display system figure;
Fig. 5 true color system in combination structure chart;
The symmetric arrays mode schematic diagram of Fig. 6 this method;
Other of Fig. 7 this method guarantees the identical arrangement mode of conjugate distance;
Embodiment
Utilize many projector scopes with pictcure generator of light intensity binaryzation tag type, by semi-transparent semi-reflecting spectroscope (2-1,2-2,2-3 ...) their image is overlapped fully on projection screen (3), and make light intensity that every projecting apparatus arrives the target area carry out optical encoding by 2 power power, form and have 2
nGray level image (n is an optical projection system platform number).Basic projection display system principle assumption diagram schematic diagram as shown in Figure 1.
Monochromatic many gray scales implementation.Utilize system principle, if among Fig. 1,2-1 to 2-8 is semi-transparent semi-reflecting spectroscope, projecting apparatus 1-1 to 1-8 is that the spatial light modulator (DMD) of switching characteristic type is the optical projection system of display device, the monochromatic projection display system (white and black displays system) that this optical projection system only uses the spatial light modulator of a light intensity binaryzation to constitute, then projected image has only two kinds of gradation of images: white and black (being encoded to 1 and 0).
In order to constitute the projected image with multistage gray scale with such optical projection system, we can synthesize a projected light beam with semi-transparent semi-reflecting spectroscope with two projecting apparatus, and as shown in Figure 2, (1) is that spatial light modulator (DMD), (2) are the TIR prism among Fig. 2.Semi-transparent semi-reflecting spectroscopical reflectivity and transmissivity are respectively 50%.Can obtain such composograph: the emergent light a of projecting apparatus (1-1) after by the native space light modulator modulates is the c of 1/2 light intensity after by spectroscope (2-1) reflection, and the light intensity that c sees through behind the spectroscope (2-2) is 1/4 of a; Emergent light d after projecting apparatus (1-2) is modulated by spatial light modulator is 1/2 of d through the catoptrical light intensity of spectroscope (2-2), f then passes through spectroscope (2-2) transmission respectively by c and d and reflection is formed by stacking, each pixel of projecting apparatus spatial light modulator has two GTGs of switch, emergent light a is identical with the d light intensity, four kinds of figure image height gray scale combinations of a*1/4+d*1/2 (a, d=0,1) therefore can be arranged altogether, at this moment we can obtain 0,1/4,2/4,3/4 image of totally 4 kinds of light intensity, and promptly 2
2The image of=4 GTGs.
The spectroscope that uses in the system (2-1,2-2,2-3 ...) have the semi-transparent semi-reflecting characteristic in visible region (410nm-690nm) broadband, i.e. 50% of a wide spectrum neutral beam split.Can adopt the optical thin film of the version of deielectric-coating+metal film+deielectric-coating obtaining semi-transparent semi-reflecting spectroscope, can constitute with the form of multilayer dielectric film does not have the semi-transparent semi-reflecting spectroscope that absorbs yet for this reason.
In order to obtain more gray scale image, adopt many projecting apparatus to cooperate a plurality of semi-transparent semi-reflecting lens, the image that synthesizes many GTGs, Fig. 3 demonstrates three projecting apparatus and spectroscopical combined system, the synthetic light intensity that can obtain three is respectively: 1/8,1/4,1/2, therefore the synthetic gray scale of three projecting apparatus has 2
3=8 kinds.If adopt four projecting apparatus and four spectroscopical combinations, can see that such combination can obtain 2
4Gray scale image can be analogized thus, adopts n platform projecting apparatus and each spectroscope of n, can form 2
nIndividual image gray.
The true color generation type.Every projecting apparatus is the colored binaryzation optical projection system of three spatial light modulators of red, green, blue (6,7,8) formation of light intensity binaryzation tag type, and adopts said n platform projecting apparatus and n spectroscopical combination, then forms every kind of color and has 2
nKind of gray scale, altogether 2
n* 2
n* 2
nPlant the image of color.If n=8 is exactly the gray scale that every kind of color has 8 bits, promptly constitute true color image, as shown in Figure 5, (4) are colour splitting prism group for spatial light modulator (DMD), (8) that act on green light for spatial light modulator (DMD), (9) that act on blue light for spatial light modulator (DMD), (7) that act on red light for the light source directional light of projecting apparatus inside, (6) among the figure.
The basic arrangement mode of this method as required, can also be used the symmetric arrays mode as shown in Figure 4, and as shown in Figure 6, the 1-1 projecting apparatus also can vertically be placed, and this moment, other structure remained unchanged.In order to guarantee that conjugate distance is identical, except adjusting the distance of spectroscope and projecting apparatus, the projection lens focal length of diverse location projecting apparatus can also be adjusted, to guarantee the coincidence fully of final pixel, the version after Fig. 2, Fig. 3 and Fig. 4 have expressed in this way; The set of lenses (11) that perhaps adds a telephoto lens structure near screen area one side at spectroscope, make this layer projecting apparatus outer zoom in the distance of two projector light path differences, projecting apparatus, spectroscope and telephoto lens form the combined projection elementary cell like this, and this sequence of unit is arranged and just formed colored many gray scale systems as shown in Figure 7.Wherein Fig. 1, Fig. 5 oblique arrangement are identical in order to guarantee every projecting apparatus conjugate distance.
The many gray scales of the formed demonstration of native system owing to adopted the parallel system of many projecting apparatus, can be not cost with frame frequency or the minimizing pixel that reduces the separate unit projecting apparatus therefore, make combined system can obtain the Projection Display of the high-resolution true color of high frame frequency.
Based on the projector scope of high speed DMD (digital micro-mirror) spatial light modulator, spatial light modulator wherein has 1024 * 768 resolution, and the speed of its switch attitude is exceedingly fast, and can reach the image binaryzation frame frequency of 8000Hz to 12000Hz.When the present invention is applied to this high-speed chip, has the high-resolution Projection Display of the high frame frequency of true color, for the development of body dimension display technologies lays the foundation with regard to being combined into 8 such projecting apparatus.
Claims (2)
1. high frame rate, true color and high resolution projection display method, it is characterized in that many projecting apparatus (1) with pictcure generator of light intensity binaryzation feature, by half-transmitting and half-reflecting mirror (2) image is overlapped fully on projection screen (3), every projecting apparatus arrives the target area by the half-transmitting and half-reflecting mirror light intensity is carried out optical encoding by 2 power power, forms to have 2
nGray level image, n=8 wherein, n is a projecting apparatus platform number; Described every projecting apparatus is the colored binaryzation projecting apparatus of three pictcure generators formations of red, green, blue of switching characteristic type, their image is overlapped fully on projection screen, and make light intensity that every projecting apparatus arrives the target area carry out optical encoding by 2 power power, then every kind of color forms and has 2
nPlant gray scale, form 2 altogether
n* 2
n* 2
nPlant the image of color; The combination of arranging of described projecting apparatus and half-transmitting and half-reflecting mirror guarantees that with following three kinds of methods conjugate distance is identical: 1) make each projecting apparatus maintenance projector distance is identical and realize; 2) make the projection lens focal length difference of every projecting apparatus and identical realization of distance of projecting apparatus and half-transmitting and half-reflecting mirror; 3) under and the situation that projecting apparatus is also identical with the distance of half-transmitting and half-reflecting mirror identical, add an imaging optical system for the rear side of each half-transmitting and half-reflecting mirror and realize at projecting apparatus; Described many projecting apparatus and Duo Tai half-transmitting and half-reflecting mirror make up by spatial arrangement, and the image of any projecting apparatus all passes through the refraction or the reflection of the half-transmitting and half-reflecting mirror of its back, and many projected image is overlapped fully on projection screen, constitute 2
0, 2
1, 2
2, 2
3..., 2
nThe light intensity combination that the geometric ratio rule changes.
2. a kind of high frame rate, true color and high resolution projection display method according to claim 1, it is characterized in that described half-transmitting and half-reflecting mirror (2) has the half-transmitting and half-reflecting characteristic in 410nm-690nm visible region broadband, it is 50% neutral beam split of wide spectrum, pictcure generator is a spatial light modulator, and spatial light modulator is digital micro-mirror device, reflective liquid crystal spatial light modulator.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100590639A CN101217672B (en) | 2008-01-09 | 2008-01-09 | A high frame rate, true color and high resolution projection display method |
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| CN2008100590639A CN101217672B (en) | 2008-01-09 | 2008-01-09 | A high frame rate, true color and high resolution projection display method |
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| CN101217672B true CN101217672B (en) | 2010-09-15 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101692696B (en) * | 2009-10-12 | 2012-01-04 | 哈尔滨工业大学 | Digital micromirror device (DMD) based method and digital micromirror device (DMD) based system for generating broadband dynamic optical scene |
| CN103995416B (en) * | 2013-01-18 | 2015-08-26 | 光宝科技股份有限公司 | Laser projection device and method of operating thereof |
| CN107659800A (en) * | 2017-08-14 | 2018-02-02 | 西安电子科技大学 | A kind of DMD high frame frequency and high resolutions synchronous dynamic display system |
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