Method for operating and individually controlling the luminance of each pixel in an emissive active-matrix display device
First Claim
32. A control system for controlling the luminance of a picture element (pixel) in a display device, the system comprising:
- a stored pixel gray level to display pixel drive signal transformation for each pixel and each gray level the pixel may be commanded to display, the stored transformation based on performance characteristics of the display pixels during a prior display frame time period;
a display drive signal generator responsive to a control that receives a command to display a particular gray level for a particular pixel location and generates a drive signal to the particular pixel using the stored transformation during a first frame time;
a luminance measurement circuit for each separate pixel in the display for measuring parameters representative of an actual measured luminances of each of the plurality of particular pixels at the end of the first display time;
a comparator circuit for determining a difference between the identified target luminance and the actual measured luminance for the particular pixel;
transformation update logic for modifying the stored transformation for each particular pixel based on the determined difference during the first frame time; and
using the modified transformation for generating the display drive signal for the particular pixel during a frame time following the first frame time.
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Abstract
System and method for controlling luminance of pixel in display. Method includes storing transformation between digital image gray level value and display drive signal that generates luminance from pixel corresponding to digital gray level value; identifying target gray level value for particular pixel; generating display drive signal corresponding to identified target gray level based on stored transformation and driving particular pixel with drive signal during first display frame; measuring parameter representative of actual measured luminance of particular pixel at a second time after the first time; determining difference between identified target luminance and actual measured luminance; modifying stored transformation for particular pixel based on determined difference; and storing and using modified transformation for generating display drive signal for particular pixel during frame time following first frame time. Control system and circuits for controlling the luminance of a picture element or pixel in a display device.
206 Citations
62 Claims
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32. A control system for controlling the luminance of a picture element (pixel) in a display device, the system comprising:
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a stored pixel gray level to display pixel drive signal transformation for each pixel and each gray level the pixel may be commanded to display, the stored transformation based on performance characteristics of the display pixels during a prior display frame time period;
a display drive signal generator responsive to a control that receives a command to display a particular gray level for a particular pixel location and generates a drive signal to the particular pixel using the stored transformation during a first frame time;
a luminance measurement circuit for each separate pixel in the display for measuring parameters representative of an actual measured luminances of each of the plurality of particular pixels at the end of the first display time;
a comparator circuit for determining a difference between the identified target luminance and the actual measured luminance for the particular pixel;
transformation update logic for modifying the stored transformation for each particular pixel based on the determined difference during the first frame time; and
using the modified transformation for generating the display drive signal for the particular pixel during a frame time following the first frame time. - View Dependent Claims (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62)
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48-1. A system as in claim 32, wherein the portion of the frame time comprises a time between the row address time and the frame time.
Specification