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

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 t1 and t2, and making t2/t1=f a/(1−a), where 0<f<=1, and t1+t2=T; determining full region image data and compensation image data through the original image data, t1, t2, and a, within time T when a frame of an image is being modulated, acquiring original light with a period of time t1, and performing modulation on the original light according to the full region image data; and acquiring compensation light within a period of time t2, other than the period of time t1, 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.

What is claimed is: 
     
         1 . A light source system, comprising:
 an original light source, for generating an original light;   a compensation light source, for generating a compensation light;   a wavelength conversion device, including a wavelength conversion layer and a substrate carrying the wavelength conversion layer, wherein the wavelength conversion layer includes a wavelength conversion material that absorbs the original light and/or the compensation light to generate a converted light; and   a control device, for controlling turning on and turning off of the original light source and the compensation light source.   
     
     
         2 . The light source system of  claim 1 , wherein within a time period T when a frame of image data is being modulated, within a time period t1 when original image data is being modulated, the control device controls the original light source to turn on, and within a time period t2 when compensation image data is being modulated, the control device controls the compensation light source to turn on, wherein t1+t2=T. 
     
     
         3 . The light source system of  claim 1 , wherein the wavelength conversion layer includes a yellow wavelength conversion material. 
     
     
         4 . The light source system of  claim 1 , wherein the wavelength conversion layer includes at least two regions, one of the regions being a transparent region. 
     
     
         5 . The light source system of  claim 4 , wherein the wavelength conversion layer includes two regions, one of the regions being a transparent region, the other one of the regions including a yellow wavelength conversion material. 
     
     
         6 . The light source system of  claim 1 , wherein the wavelength conversion layer includes an original region and a compensation region, the original region and the original light source together outputting the original light, and the compensation region and the compensation light source together outputting the compensation light. 
     
     
         7 . The light source system of  claim 6 , wherein each of the original region and the compensation region includes a plurality of segments, wherein one segment of the original region and one segment of the compensation region that corresponds to the one segment of the original region include the same wavelength conversion material. 
     
     
         8 . The light source system of  claim 6 , wherein the wavelength conversion layer has a circular shape, wherein the original region and the compensation region each spans an angular range, and wherein a ratio of the angular ranges of the original region and the compensation region is a predetermined value. 
     
     
         9 . The light source system of  claim 6 , wherein the compensation region includes a yellow wavelength conversion material or a green wavelength conversion material. 
     
     
         10 . The light source system of  claim 1 , wherein the original light source is a blue solid state light emitting device and the compensation light source is a red solid state light emitting device or a green solid state light emitting device. 
     
     
         11 . The light source system of  claim 1 , further comprising a light combination device which combines the original light and the compensation light into one beam of output light. 
     
     
         12 . The light source system of  claim 11 , wherein the light combination device includes X shaped dichroic filter plates, wherein the original light and the compensation light are respectively incident to the X shaped dichroic filter plates from three sides and exit from another side of the X shaped dichroic filter plates different from the three sides;
 or wherein the light combination device includes two parallel filter plates which combine the original light and the compensation light into one light beam.   
     
     
         13 . A projection system, comprising:
 a light source system;   an optical modulation device; and   a projection lens,   wherein the light source system includes an original light source generating an original light, a compensation light source generating a compensation light, a wavelength conversion device and a control device, wherein the wavelength conversion device includes a wavelength conversion layer and a substrate carrying the wavelength conversion layer, wherein the wavelength conversion layer includes a wavelength conversion material that absorbs the original light and/or the compensation light to generate a converted light, and wherein the control device controls turning on and turning off of the original light source and the compensation light source,   wherein the optical modulation device modulates the light outputted by the light source system to generate an image light beam, and   wherein the projection lens projects the image light beam from the optical modulation device to a predetermined plane.   
     
     
         14 . The projection system of  claim 13 , wherein within a time period T when a frame of image data is being modulated, within a time period t1 when original image data is being modulated, the control device controls the original light source to turn on, and within a time period t2 when compensation image data is being modulated, the control device controls the compensation light source to turn on, wherein t1+t2=T. 
     
     
         15 . The projection system of  claim 13 , wherein the wavelength conversion layer includes a yellow wavelength conversion material. 
     
     
         16 . The projection system of  claim 13 , wherein the wavelength conversion layer includes at least two regions, one of the regions being a transparent region. 
     
     
         17 . The projection system of  claim 16 , wherein the wavelength conversion layer includes two regions, one of the regions being a transparent region, the other one of the regions including a yellow wavelength conversion material. 
     
     
         18 . The projection system of  claim 13 , wherein the wavelength conversion layer includes an original region and a compensation region, the original region and the original light source together outputting the original light, and the compensation region and the compensation light source together outputting the compensation light. 
     
     
         19 . The projection system of  claim 18 , wherein each of the original region and the compensation region includes a plurality of segments, wherein one segment of the original region and one segment of the compensation region that corresponds to the one segment of the original region include the same wavelength conversion material. 
     
     
         20 . The projection system of  claim 18 , wherein the compensation region includes a yellow wavelength conversion material or a green wavelength conversion material. 
     
     
         21 . The projection system of  claim 13 , wherein the original light source is a blue solid state light emitting device and the compensation light source is a red solid state light emitting device or a green solid state light emitting device. 
     
     
         22 . The projection system of  claim 13 , wherein the light source system further includes a light combination device which combines the original light and the compensation light into one beam of output light. 
     
     
         23 . The projection system of  claim 22 , wherein the light combination device includes X shaped dichroic filter plates, wherein the original light and the compensation light are respectively incident to the X shaped dichroic filter plates from three sides and exit from another side of the X shaped dichroic filter plates different from the three sides;
 or wherein the light combination device includes two parallel filter plates which combine the original light and the compensation light into one light beam.   
     
     
         24 . The projection system of  claim 13 , wherein the optical modulation device includes 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 t1 and t2, such that t2/t1=f*a/(1−a), where 0<f≦1, and t1+t2=T;   acquiring values m and n, such that m*t1/T+n*t2/T=u*t1/T, and where at least two values among m, n and u satisfy a predetermined relationship;   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   wherein the optical modulation device acquires the original light and modulates the original light according to the full region image data within a time period t1 of a time period T when a frame of image is being modulated, and acquires a compensation light and modulates the compensation light according to the compensation image data within a time period t2 of the time period T, wherein t2 is a time period within the time period T other than the time period t1.