Display uniformity compensation method, optical modulation apparatus, signal processor, and projection system

Patent metadata

Field	Value
Publication number	US-9667929-B2
Application number	US-201414889772-A
Country	US
Kind code	B2
Filing date	May 7, 2014
Priority date	May 8, 2013
Publication date	May 30, 2017
Grant date	May 30, 2017

Abstract

Disclosed are a display uniformity compensation method, an optical modulation apparatus, a signal processor, and a projection system. The method comprises: acquiring original image data and an optical loss coefficient a of a compensation region, acquiring t 1 and t 2 , and making t 2 /t 1 =f a/(1−a), where 0<f<=1, and t 1 +t 2 =T; determining full region image data and compensation image data through the original image data, t 1 , t 2 , and a, within time T when a frame of an image is being modulated, acquiring original light with a period of time t 1 , and performing modulation on the original light according to the full region image data; and acquiring compensation light within a period of time t 2 , other than the period of time t 1 , within the time T, and performing modulation on the compensation light according to the compensation image data. An embodiment of the present invention provides a method for improving a uniformity degree of brightness of an image on a display unit.

First claim

What is claimed is:

1. A display uniformity compensation method, comprising:
S 11 : acquiring an original image data and an optical loss coefficient a of a compensation region, where a grayscale value of the original image data corresponding to an arbitrary point A in a non-compensation region of a display unit is u, and that corresponding to an arbitrary point B in the predetermined compensation region of the display unit is v;
S 12 : acquiring values t 1 and t 2 , such that t 2 /t 1 =f*a/(1−a), where 0<f≦1, and t 1 +t 2 =T;
S 13 : acquiring values m and n, such that m*t 1 /T+n*t 2 /T=u*t 1 /T, and where at least two values among m, n and u satisfy a predetermined relationship;
S 14 : determining a full region image data and a compensation image data based on m, n and v, where a grayscale value of the full region image data corresponding to the point A is m and that corresponding to the point B is v, and where a grayscale value of the compensation image data corresponding to the point A is n and that corresponding to the point B is q, where q≧v, and where q and v satisfy a predetermined relationship; and
S 15 : within a time period T when a frame of image is being modulated, within a time period t 1 , acquiring an original light and modulating the original light according to the full region image data, and within a time period t 2 , which is a time period within the time period T other than the time period t 1 , acquiring a compensation light and modulating the compensation light according to the compensation image data.

2. The display uniformity compensation method of claim 1 , wherein t 2 /t 1 =a/(1−a), q=v, and the original light and the compensation light have same flux.

3. The display uniformity compensation method of claim 1 , wherein t 2 /t 1 <a/(1−a), and the original light and the compensation light have same flux; and
wherein step S 14 further includes acquiring a predetermined grayscale compensation value p, where 0<p≦[y 0 ], y 0 =(t 1 *v*a)[t 2 *(1−a)]−v, and q=v+p.

4. The display uniformity compensation method of claim 1 , wherein t 2 /t 1 <a/(1−a), n=0, m=u, q=v, and a flux of the compensation light is d times that of the original light, where d=(t 1 *a)/[t 2 *(1−a)].

5. The display uniformity compensation method of claim 1 , wherein t 2 /t 1 <a/(1−a), n=0, m=u, and a flux of the compensation light is d times that of the original light; and
wherein step S 14 further includes acquiring a predetermined grayscale compensation value p, where 0<p≦[y 0 ], y 0 =(t 1 *v*a)(d+t 2 )−v, and q=v+p.

6. The display uniformity compensation method of claim 1 , wherein in step S 11 , acquiring the optical loss coefficient a of the compensation region includes: acquiring an optical loss coefficient matrix of the compensation region, and taking an optical loss coefficient of a pixel B 1 in the optical loss coefficient matrix as the optical loss coefficient a, where a grayscale value of the original image data corresponding to the pixel B 1 of the predetermined compensation region of the display unit is v 1 , and that corresponding to an arbitrary other pixel B 2 of the predetermined compensation region is v 2 , where the optical loss coefficient of the optical loss coefficient matrix corresponding to the pixel B 1 is a 1 , and that corresponding to the pixel B 2 is a 2 ;
wherein t 2 /t 1 =a/(1−a);
wherein step S 14 further includes acquiring predetermined grayscale compensation values, where the grayscale compensation value p of the compensation image data corresponding to the pixel B 1 is p=0, and that corresponding to the pixel B 2 is p 4 =[y 0 ], where y 0 , [t 1 *v 2 −T*v 2 *(1−a 2 )]/t 2 , wherein q=v+p; and
wherein the original light and the compensation light have same flux.

7. The display uniformity compensation method of claim 6 , wherein the optical loss coefficient of the pixel B 1 is a median value of the optical loss coefficient matrix.

8. The display uniformity compensation method of claim 1 , wherein n=0.

9. An optical modulation device, comprising:
a signal processor for: acquiring an original image data and an optical loss coefficient a of a compensation region, where a grayscale value of the original image data corresponding to an arbitrary point A in a non-compensation region of a display unit is u, and that corresponding to an arbitrary point B in the predetermined compensation region of the display unit is v; acquiring values t 1 and t 2 , such that t 2 /t 1 =f*a/(1−a), where 0<≦1, and t 1 +t 2 =T; acquiring values m and n, such that m*t 1 /T+n*t 2 /T=u*t 1 /T, and where at least two values among m, n and u satisfy a predetermined relationship; and determining a full region image data and a compensation image data based on m, n and v, where a grayscale value of the full region image data corresponding to the point A is m and that corresponding to the point B is v, and where a grayscale value of the compensation image data corresponding to the point A is n and that corresponding to the point B is q, where q≧v, and where q and v satisfy a predetermined relationship; and
an optical modulator unit for: within a time period T when a frame of image is being modulated, within a time period t 1 , acquiring an original light and modulating the original light according to the full region image data from the signal processor, and within a time period t 2 , which is a time period within the time period T other than the time period t 1 , acquiring a compensation light and modulating the compensation light according to the compensation image data from the signal processor.

10. The optical modulation device of claim 9 , wherein t 2 /t 1 =a/(1−a), and q=v.

11. The optical modulation device of claim 9 , wherein the signal processor further acquires an optical loss coefficient matrix of the compensation region, and takes the optical loss coefficient of a pixel B 1 in the optical loss coefficient matrix as the optical loss coefficient a, where the grayscale value of the original image data corresponding to the pixel B 1 of the predetermined compensation region of the display unit is v 1 , and that corresponding to an arbitrary other pixel B 2 of the predetermined compensation region is v 2 , where an optical loss coefficient of the optical loss coefficient matrix corresponding to the pixel B 1 is a 1 , and an optical loss coefficient corresponding to the pixel B 2 is a 2 ;
wherein t 2 /t 1 =a/(1−a); and
wherein the signal processor further acquires predetermined grayscale compensation values, where a grayscale compensation value p of the compensation image data corresponding to the pixel B 1 is p=0, and a grayscale compensation value p corresponding to the pixel B 2 is p 4 =[y 0 ], where y 0 =[t 1 *v 2 −T*v 2 *(1−a 2 )]/t 2 , and q=v+p.

12. The optical modulation device of claim 9 , wherein the optical loss coefficient of the pixel B 1 is a median value of the optical loss coefficient matrix.

13. A signal processor, comprising:
a first acquiring module for acquiring an original image data and an optical loss coefficient a of a compensation region, where a grayscale value of the original image data corresponding to an arbitrary point A in a non-compensation region of the display unit is u, and that corresponding to an arbitrary point B in the predetermined compensation region of the display unit is v, and for acquiring values t 1 and t 2 , such that t 2 /t 1 =f*a/(1−a), where 0<f≦1, and t 1 +t 2 =T;
a second acquiring module for acquiring values m and n, such that m*t 1 /T+n*t 2 /T=u*t 1 /T, and where at least two values among m, n and u satisfy a predetermined relationship; and
a determination module for determining a full region i

Assignees

• Appotronics China Corp

Inventors

• Yang Chengde

Classifications

• G09G2320/0233

  Improving the luminance or brightness uniformity across the screen · CPC title

• G09G3/346

  based on modulation of the reflection angle, e.g. micromirrors (micromirrors devices per se G02B26/0833) · CPC title

• G09G2320/0646

  Modulation of illumination source brightness and image signal correlated to each other · CPC title

• G09G2320/06

  Adjustment of display parameters · CPC title

• G09G3/3406

  Control of illumination source (illumination devices structurally associated with liquid crystal cells G02F1/1336) · CPC title