CN103700361B - A kind of solid-state volume type real tri-dimension display gray scale implementation method - Google Patents
A kind of solid-state volume type real tri-dimension display gray scale implementation method Download PDFInfo
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- CN103700361B CN103700361B CN201310688649.2A CN201310688649A CN103700361B CN 103700361 B CN103700361 B CN 103700361B CN 201310688649 A CN201310688649 A CN 201310688649A CN 103700361 B CN103700361 B CN 103700361B
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Abstract
The invention discloses a kind of solid-state volume type real tri-dimension display gray scale implementation method, the light that light source sends projects on DMD after preposition light path converges, DMD makes micro mirror produce the upset corresponding with image under the driving of 3D rendering control circuit, by light reflection, emergent ray projects imaging on liquid crystal light valve after imaging optical path; For the image of a width n position gray level, its display cycle is divided into n display subfield according to bit position, each display subfield shows the image of a bit position, each display subfield loads different driving voltages at light valve two ends, when making each display subfield, light valve transmitance is different, by the time integral effect of vision, the gray level image of n position will be perceived as.The present invention substantially reduces the displaying time of gray level image under high grade grey level, thus can significantly improve the gray level of solid-state volume type real tri-dimension display, promotes the color levels of real tri-dimension display.
Description
Technical field
The present invention relates to solid-state volume type real tri-dimension display, particularly relate 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, use Digital Micromirror Device (DigitalMirrorDevice, DMD) for spatial light modulator at present, the general gradation control method of DMD is time-modulation method.This method, by controlling the length of the lighting time of each bit position of image, realizes different gray shade scales.One width grey scale image data is divided into several subfield according to bit position by this kind of method, and the displaying time of each subfield corresponds to the weights of this bit position, and the display of these subfields is superimposed and just can forms different gray scales.Because image is with binary storage, therefore weights are corresponding with the power of each bit position of binary number.According to this kind of method, show the image that a width gray shade scale is n position gray level, just according to bit position, view data can be divided into n subfield, bit m(m=0,1,2 ..., n-1) and corresponding subfield displaying time is 2mT, wherein T is the displaying time of least significant bit (LSB) (LSB:LeastSignificantBit) corresponding subfield.The total displaying time completed needed for all subfields of this width image is (2n-1) T.
In the DMD Projection Display of routine, because image refreshing frequency requirement not high (being generally 60Hz), time-modulation method is a kind of more satisfactory method, can realize the gray shade scale that 8bits true color etc. is higher.But in the display of solid-state volume type real tri-dimension, image refreshing frequency requirement very high (often reaching more than 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 increases with the increase exponentially of gradation of image bit figure place, and it is larger that the subfield of higher bit position shows the time cost paid.In addition, due to the restriction on hardware, have a Best-case Response Time (being designated as Tmin) during DMD display, the displaying time T of least significant bit (LSB) (LSB:LeastSignificantBit) corresponding subfield must meet T=>Tmin.So time-modulation method shows under high refresh rate requires at solid-state volume type real tri-dimension and is difficult to reach higher display gray scale, and the gray level causing 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 the limitation that prior art is difficult to reach higher display gray scale under real tri-dimension shows high refresh rate, promote the color levels of real tri-dimension display.
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 display imaging system, solid-state volume type real tri-dimension display imaging system includes the light source set 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; The light that light source sends projects on DMD after preposition light path converges, 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; For the image of a width n position gray level, its display cycle is divided into n display subfield according to bit position, each display subfield shows the image of a bit position, each display subfield loads different driving voltages at light valve two ends, when making each display subfield, light valve transmitance is different, by the time integral effect of vision, the gray level image of n position will be perceived as.
The display cycle of the image of an above-mentioned width n position gray level is divided into n display subfield according to bit, and the displaying time of n display subfield is equal.
Above-mentioned each display 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 display subfield be display subfield corresponding to subfield 0, bit1 is subfield 1,, bit(n-1) and corresponding display subfield is subfield n-1; At light valve two ends on-load voltage U during subfield 0
0, now the transmitance of light valve is P
0; At light valve two ends on-load voltage U during subfield 1
1, now the transmitance of light valve is P
1; At light valve two ends making alive U during subfield 2
2, now the transmitance of light valve is P
2, by that analogy, at light valve two ends making alive U during subfield n-1
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, the problem making solid-state volume type real tri-dimension be presented at gray level under high refreshing frequency to be difficult to improve, adopt different display subfield to apply different driving voltages at liquid crystal light valve two ends to realize the different transmitances of shielding, utilize the time integral effect of vision to realize the method for gray level; Compared with prior art, the present invention substantially reduces the displaying time of gray level image under high grade grey level, thus can significantly improve the gray level of solid-state volume type real tri-dimension display, promotes the color levels of real tri-dimension display.
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 gray level formation basic theory figure of the present invention.
Fig. 4 is the inventive method and Conventional temporal 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 part.The light that light source 1 sends projects on DMD3 after preposition light path 2 converges, and DMD3 makes micro mirror produce the upset corresponding with image, by light reflection under the driving of 3D rendering control circuit 4.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 lower; The transmitance of liquid crystal light valve 6 is lower, and brightness of image is higher.
As shown in Figure 2, first DMD3 will carry out the Data import (Load) of corresponding bit position before display image in sub-fields, and scale-of-two bit bit data is transferred to the data storage cell below DMD micro mirror by 3D rendering control circuit 4.After Data import, need to DMD reset command (Reset) micro mirror, upset just can occur again thus display image.The stationary phase (SettleTime) of the necessary about 8us in interval between twice Data import (Load) operation.Therefore, between DMD3 twice image display, due to the rate limit on hardware, have a Best-case Response Time, be designated as Tmin, this Best-case Response Time limits the shortest displaying time of each subfield of solid-state volume type real tri-dimension display.
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 is equal.At light valve two ends on-load voltage U during subfield 0
0, now the transmitance of light valve is P
0; At light valve two ends on-load voltage U during subfield 1
1, now the transmitance of light valve is P
1; At light valve two ends on-load voltage U during subfield 2
2, now the transmitance of light valve is P
2, by that analogy, at light valve two ends on-load voltage U during subfield n-1
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 during subfield 1, light valve transmitance is subfield 0 1/2, when the brightness of image on light valve is subfield 02
1doubly, by that analogy, during subfield n-1, when the brightness of image on light valve is subfield 02
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 comparing of the inventive method and time-modulation method, for the true three-dimansioual display of 5 gray levels, the displaying time of each subfield needed for the inventive method is identical, note bit0(LSB) corresponding subfield displaying time is T, then the total displaying time needed for a width gray level image is 5T; And the total displaying time needed for time-modulation method is 31T.The former displaying time and gray level are multiple proportion, the displaying time of the latter and gray level exponentially relation, visible the present invention substantially reduces the displaying time of gray level image under high grade grey level, thus the gray level of solid-state volume type real tri-dimension display can be significantly improved, promote the color levels of real tri-dimension display.
Claims (1)
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 display imaging system, solid-state volume type real tri-dimension display imaging system includes the light source set 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; The light that light source sends projects on DMD after preposition light path converges, 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; For the image of a width n position gray level, its display cycle is divided into n display subfield according to bit position, and the displaying time of n display subfield is equal; Each display subfield shows the image of a bit position, each display subfield loads different driving voltages at light valve two ends, when making each display subfield, light valve transmitance is different: note bit0(LSB) corresponding display subfield is subfield 0, the display subfield that bit1 is corresponding is subfield 1,, bit(n-1) and corresponding display subfield is subfield n-1; At light valve two ends on-load voltage U during subfield 0
0, now the transmitance of light valve is P
0; At light valve two ends on-load voltage U during subfield 1
1, now the transmitance of light valve is P
1; At light valve two ends making alive U during subfield 2
2, now the transmitance of light valve is P
2, by that analogy, at light valve two ends making alive U during subfield n-1
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; By the time integral effect of vision, the gray level image of n position will be perceived as.
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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 |
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4089572B2 (en) * | 2003-09-24 | 2008-05-28 | セイコーエプソン株式会社 | Lighting device, image display device, and projector |
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Patent Citations (3)
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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 |
| 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 |
|---|
| DepthCube solid-state 3D volumetric display;Sullivan A;《Electronic Imaging:International Society for Optics and Photonics》;20041231;279-284 * |
| 固态体积式真三维立体显示器的色度学特性;冯奇斌等;《液晶与显示》;20110228;第26卷(第01期);100-103 * |
| 用于固态体积式真三维立体显示的LED投影照明系统研究;冯奇斌等;《光电工程》;20110930;第38卷(第09期);93-98 * |
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