Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1992-07-10
1993-09-14
Oberley, Alvin E.
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
358 10, 345 89, 345117, G09G 336
Patent
active
052453260
ABSTRACT:
A TFT LCD display has a PEL matrix in which the drain lines of the different TFTs are supplied with different drain voltages to achieve a preset number of gray scales. The different drain voltages are set during factory calibration through use of a test PEL having substantially the same characteristics as the PELs viewable by a user. The characteristics of the test PEL are first measured, the values of drain voltages for achieving the different gray scales are mathematically derived from the measurements, and such values are stored in the display system. The specific manner in which calibration is done is by measuring output voltages of a photodiode located next to the test PEL as a function of different drain voltage inputs and constructing a unique transmissivity versus drain voltage for the subject display. Calibration is accomplished by a factory tester or by a built-in calibration system.
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Goon Gin
International Business Machines Corp.
McConnell Daniel E.
McKechnie Douglas R.
Oberley Alvin E.
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