CN103700361A - Method for realizing gray scale of solid volumetric true three-dimensional (3D) display - Google Patents
Method for realizing gray scale of solid volumetric true three-dimensional (3D) display Download PDFInfo
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- CN103700361A CN103700361A CN201310688649.2A CN201310688649A CN103700361A CN 103700361 A CN103700361 A CN 103700361A CN 201310688649 A CN201310688649 A CN 201310688649A CN 103700361 A CN103700361 A CN 103700361A
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Abstract
The invention discloses a method for realizing gray scale of solid volumetric true three-dimensional (3D) display. According to the method, light emitted by a light source is projected onto a DMD (Digital Micromirror Device) after being converged through a front light path, the DMD is used for overturning a micromirror corresponding to an image under the driving action of a 3D image, light rays are reflected, and emergent rays are projected onto a liquid crystal light valve to be imaged after passing through an imaging light path; the display period of an image with an n-bit gray scale is partitioned into n display sub-fields according to bits, and each display sub-field is used for displaying an image of one bit and loading different driving voltages at the two ends of the light valve, so that the transmittance of the light valve varies in each sub-field, and a gray scale image of n bits can be sensed via a visual time integration effect. According to the method, the display time of the gray scale image is shortened greatly on a high gray scale, so that the gray scale of solid volumetric true three-dimensional display can be increased remarkably, and the color grade of true three-dimensional display is raised.
Description
Technical field
The present invention relates to solid-state volume type real tri-dimension display, relate in particular to a kind of solid-state volume type real tri-dimension display gray scale implementation method.
Background technology
In solid-state volume type real tri-dimension display, using at present Digital Micromirror Device (Digital Mirror Device, DMD) is spatial light modulator, and the general gradation control method of DMD is time-modulation method.This method is the length as the time of lighting of each bit position by control chart, realizes different gray shade scales.This kind of method is divided into several subfields by a width grey scale image data according to bit position, and the displaying time of each subfield is corresponding to the weights of this bit position, and the demonstration of these subfields is superimposed and just can forms different gray scales.Because image is with binary storage, so weights are corresponding with the power of each bit position of binary number.According to this kind of method, show that a width gray shade scale is the image of n position gray level, just can view data be divided into n subfield according to bit position, bit m(m=0,1,2 ..., n-1) corresponding subfield displaying time is 2mT, wherein T is the displaying time of the corresponding subfield of least significant bit (LSB) (LSB:Least Significant Bit).Completing the required total displaying time of all subfields of this width image is (2n-1) T.
In conventional DMD Projection Display, because image refreshing frequency requirement not high (being generally 60Hz), time-modulation method is a kind of more satisfactory method, can realize the higher gray shade scales such as 8bits true color.But in solid-state volume type real tri-dimension shows, image refreshing frequency requirement very high (more than often reaching 1KHz), the displaying time of a width gray level image is extremely short.For time-modulation method, the displaying time of a width gray level image is to increase with the increase exponentially of gradation of image bit figure place, and the subfield of higher bit position shows that the time cost of paying is larger.In addition, due to the restriction on hardware, DMD has a Best-case Response Time (being designated as Tmin) while showing, the displaying time T of the corresponding subfield of least significant bit (LSB) (LSB:Least Significant Bit) must meet T=>Tmin.So time-modulation method shows and be difficult to the display gray scale that reaches higher under high refresh rate requires at solid-state volume type real tri-dimension, the gray level that causes current solid-state volume type real tri-dimension to show is lower, and color is abundant not.
Summary of the invention
The object of the invention is to provide a kind of solid-state volume type real tri-dimension display gray scale implementation method, to solve prior art, at real tri-dimension, show the limitation of the display gray scale that is difficult under high refresh rate to reach higher, promote the color levels that real tri-dimension shows.
In order to achieve the above object, the technical solution adopted in the present invention is:
A kind of solid-state volume type real tri-dimension display gray scale implementation method, it is characterized in that, include solid-state volume type real tri-dimension and show imaging system, solid-state volume type real tri-dimension shows that imaging system includes the light source setting gradually, preposition light path, DMD, 3D rendering control circuit, imaging optical path and liquid crystal light valve, and DMD is connected with 3D rendering control circuit; It is upper that the light that light source sends projects DMD after converging through preposition light path, and DMD makes micro mirror produce the upset corresponding with image under the driving of 3D rendering control circuit, and by light reflection, emergent ray projects imaging on liquid crystal light valve after imaging optical path; Image for a width n position gray level, its display cycle is divided into n according to bit position and shows subfield, each shows that subfield shows the image of a bit position, each shows that subfield loads different driving voltages at light valve two ends, while making each show subfield, light valve transmitance is different, by the time integral effect of vision, will be perceived as the gray level image of n position.
The display cycle of the image of an above-mentioned width n position gray level is divided into n according to bit and shows subfield, and n displaying time that shows subfield equates.
Above-mentioned each demonstration subfield loads different driving voltages at light valve two ends, for the true three-dimansioual display of n position gray level, note bit0(LSB) corresponding demonstration subfield is subfield 0, and the demonstration subfield that bit1 is corresponding is subfield 1,, bit(n-1) corresponding demonstration subfield is subfield n-1; During subfield 0 at light valve two ends on-load voltage U
0, now the transmitance of light valve is P
0; During subfield 1 at light valve two ends on-load voltage U
1, now the transmitance of light valve is P
1; During subfield 2 at light valve two ends making alive U
2, now the transmitance of light valve is P
2, by that analogy, during subfield n-1 at light valve two ends making alive U
n-1, now the transmitance of light valve is P
n-1.P
0, P
1, P
2..., P
n-1satisfy condition: P
0=2
1p
1=2
2p
2=...=2
n-1p
n-1.
Compared with prior art, beneficial effect of the present invention is:
In the present invention, long in order to overcome time-modulation method required displaying time under high grade grey level, make solid-state volume type real tri-dimension be presented at gray level under high refreshing frequency and be difficult to the problem improving, adopt differently to show that subfields apply different driving voltages to realize the different transmitances of screen at liquid crystal light valve two ends, utilize the time integral effect of vision to realize the method for gray level; Compared with prior art, the present invention has greatly shortened the displaying time of gray level image under high grade grey level, thereby can significantly improve the gray level that solid-state volume type real tri-dimension shows, promotes the color levels that real tri-dimension shows.
Accompanying drawing explanation
Fig. 1 is that in the present invention, solid-state volume type real tri-dimension is shown as picture system architecture schematic diagram.
Fig. 2 is that in the present invention, DMD shows Best-case Response Time schematic diagram.
Fig. 3 is that gray level of the present invention forms schematic diagram.
Fig. 4 is the inventive method and traditional time-modulation method gamma characteristic comparison diagram.
Embodiment
As shown in Figure 1, real tri-dimension display imaging engine includes light source 1, preposition light path 2, DMD3,3D rendering control circuit 4, imaging optical path 5 and liquid crystal light valve 6 six parts.It is upper that the light that light source 1 sends projects DMD3 after converging through preposition light path 2, and DMD3 makes micro mirror produce the upset corresponding with image under the driving of 3D rendering control circuit 4, by light reflection.Emergent ray projects imaging on liquid crystal light valve 6 after imaging optical path 5.During projection imaging, the transmitance of liquid crystal light valve 6 is higher, and brightness of image is just lower; The transmitance of liquid crystal light valve 6 is lower, and brightness of image is just higher.
As shown in Figure 2, the data that first DMD3 will carry out corresponding bit position before showing image in sub-fields load (Load), and scale-of-two bit bit data is transferred to the data storage cell of DMD micro mirror below by 3D rendering control circuit 4.After data loaded, need to be again give a reset command of DMD (Reset) thus upset just can occur micro mirror shows image.Two secondary data load the stationary phase (Settle Time) of the necessary about 8us in interval between (Load) operation.Therefore, between twice image of DMD3 shows, due to the rate limit on hardware, have a Best-case Response Time, be designated as Tmin, this Best-case Response Time has limited the shortest displaying time of each subfield of solid-state volume type real tri-dimension demonstration.
As shown in Figure 3.For the image of a width n position gray level, its display cycle is divided into n subfield, and the displaying time of this n subfield equates.During subfield 0 at light valve two ends on-load voltage U
0, now the transmitance of light valve is P
0; During subfield 1 at light valve two ends on-load voltage U
1, now the transmitance of light valve is P
1; During subfield 2 at light valve two ends on-load voltage U
2, now the transmitance of light valve is P
2, by that analogy, during subfield n-1 at light valve two ends on-load voltage U
n-1, now the transmitance of light valve is P
n-1; P
0, P
1, P
2..., P
n-1satisfy condition: P
0=2
1p
1=2
2p
2=...=2
n-1p
n-1.Because each subfield displaying time is identical, but light valve transmitance is different, and according to the time integral effect of vision, the brightness of each image in sub-fields that Human Perception arrives is different: during subfield 0, light valve transmitance is the highest, and the imaging on light valve is the darkest; When light valve transmitance is subfield 0 during subfield 1 1/2, the 2 when brightness of image on light valve is subfield 0
1doubly, by that analogy, during subfield n-1, the 2 when brightness of image on light valve is subfield 0
n-1doubly, its brightness of image is just corresponding with the bit weights of each subfield, therefore by the accumulated time effect of human eye vision, will be perceived as the gray level image of a width n position.Be illustrated in figure 4 the comparison of the inventive method and time-modulation method, the true three-dimansioual display of 5 gray levels of take is example, the displaying time of each subfield that the inventive method is required is identical, note bit 0(LSB) corresponding subfield displaying time is T, and the required total displaying time of a width gray level image is 5T; And the required total displaying time of time-modulation method is 31T.The former displaying time and gray level are multiple relation, the latter's displaying time and gray level are exponential relationship, visible the present invention has greatly shortened the displaying time of gray level image under high grade grey level, thereby can significantly improve the gray level that solid-state volume type real tri-dimension shows, promote the color levels that real tri-dimension shows.
Claims (3)
1. a solid-state volume type real tri-dimension display gray scale implementation method, it is characterized in that, include solid-state volume type real tri-dimension and show imaging system, solid-state volume type real tri-dimension shows that imaging system includes the light source setting gradually, preposition light path, DMD, 3D rendering control circuit, imaging optical path and liquid crystal light valve, and DMD is connected with 3D rendering control circuit; It is upper that the light that light source sends projects DMD after converging through preposition light path, and DMD makes micro mirror produce the upset corresponding with image under the driving of 3D rendering control circuit, and by light reflection, emergent ray projects imaging on liquid crystal light valve after imaging optical path; Image for a width n position gray level, its display cycle is divided into n according to bit position and shows subfield, each shows that subfield shows the image of a bit position, each shows that subfield loads different driving voltages at light valve two ends, while making each show subfield, light valve transmitance is different, by the time integral effect of vision, will be perceived as the gray level image of n position.
2. according to a kind of solid-state volume type real tri-dimension display gray scale implementation method described in right 1, it is characterized in that, the display cycle of the image of a width n position gray level is divided into n according to bit and shows subfield, and n displaying time that shows subfield equates.
3. according to a kind of solid-state volume type real tri-dimension display gray scale implementation method described in right 1, it is characterized in that, each shows that subfield loads different driving voltages at light valve two ends, true three-dimansioual display for n position gray level, note bit0(LSB) corresponding demonstration subfield is subfield 0, the demonstration subfield that bit1 is corresponding is subfield 1 ..., bit(n-1) corresponding demonstration subfield is subfield n-1; During subfield 0 at light valve two ends on-load voltage U
0, now the transmitance of light valve is P
0; During subfield 1 at light valve two ends on-load voltage U
1, now the transmitance of light valve is P
1; During subfield 2 at light valve two ends making alive U
2, now the transmitance of light valve is P
2, by that analogy, during subfield n-1 at light valve two ends making alive U
n-1, now the transmitance of light valve is P
n-1;
P
0, P
1, P
2..., P
n-1satisfy condition: P
0=2
1p
1=2
2p
2=...=2
n-1p
n-1.
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Citations (4)
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|---|---|---|---|---|
| TW200300848A (en) * | 2001-12-11 | 2003-06-16 | Seiko Epson Corp | Projective display device and display device, and their driving methods |
| US20070171646A1 (en) * | 2003-09-24 | 2007-07-26 | Seiko Epson Corporation | Illumination device, image display device, and projector |
| CN101546103A (en) * | 2009-05-05 | 2009-09-30 | 合肥工业大学 | Projection optics engine for true three-dimensional solid-state volume type stereo display system |
| CN103021356A (en) * | 2012-11-28 | 2013-04-03 | 合肥工业大学 | Circuit and method for fast driving solid-state volumetric true three-dimensional liquid-crystal light valve |
-
2013
- 2013-12-13 CN CN201310688649.2A patent/CN103700361B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200300848A (en) * | 2001-12-11 | 2003-06-16 | Seiko Epson Corp | Projective display device and display device, and their driving methods |
| US20070171646A1 (en) * | 2003-09-24 | 2007-07-26 | Seiko Epson Corporation | Illumination device, image display device, and projector |
| CN101546103A (en) * | 2009-05-05 | 2009-09-30 | 合肥工业大学 | Projection optics engine for true three-dimensional solid-state volume type stereo display system |
| CN103021356A (en) * | 2012-11-28 | 2013-04-03 | 合肥工业大学 | Circuit and method for fast driving solid-state volumetric true three-dimensional liquid-crystal light valve |
Non-Patent Citations (3)
| Title |
|---|
| SULLIVAN A: "DepthCube solid-state 3D volumetric display", 《ELECTRONIC IMAGING:INTERNATIONAL SOCIETY FOR OPTICS AND PHOTONICS》 * |
| 冯奇斌等: "固态体积式真三维立体显示器的色度学特性", 《液晶与显示》 * |
| 冯奇斌等: "用于固态体积式真三维立体显示的LED投影照明系统研究", 《光电工程》 * |
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