Real time method and apparatus for adjusting contrast ratio of liquid crystal displays
A microprocessor manipulates the gray scale voltage levels in a liquid crystal display panel (100), in order to provide for enhanced image quality over temperature extremes by monitoring the actual transmittance through the liquid crystal display (100) over time and comparing the information with ea...
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Main Authors | , |
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Format | Patent |
Language | English French German |
Published |
02.02.1994
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Edition | 5 |
Subjects | |
Online Access | Get full text |
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Summary: | A microprocessor manipulates the gray scale voltage levels in a liquid crystal display panel (100), in order to provide for enhanced image quality over temperature extremes by monitoring the actual transmittance through the liquid crystal display (100) over time and comparing the information with earlier information. The transmittance information is obtained by monitoring the output of a photo conductor (108) at a corner of the panel (100) in response to the light received through the panel (100) from a light emitting diode (106) while varying the voltage applied to the respective liquid crystal. |
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Bibliography: | Application Number: EP19880309805 |