Method for maintaining the white colour point in a field-sequential LCD over time
First Claim
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1. A method for maintaining a colour point on a display, comprising:
- determining a first value corresponding to on time for a light source of a first colour;
comparing the first value against a first threshold; and
if the first value exceeds the first threshold, setting a second value for the light source to compensate for aging.
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Abstract
A field sequential liquid crystal display maintains its white colour point through compensation values to at least one colour light emitting diode that illuminates the display. The compensation values may be impedances to control the current or pulsing of the current source according to a pulse width modulation technique. A degradation curve may be used to calculate extrapolate the theoretical forward voltage of the light emitting diode. Additional complexity arises from the need for calculating uptime for multiple light emitting diodes of different colours. Brightness levels may also be factored in.
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Citations
21 Claims
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1. A method for maintaining a colour point on a display, comprising:
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determining a first value corresponding to on time for a light source of a first colour;
comparing the first value against a first threshold; and
if the first value exceeds the first threshold, setting a second value for the light source to compensate for aging. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A field sequential liquid crystal display that compensates for white colour point drift over time, comprising:
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a liquid crystal display; and
a first light emitting diode for illuminating the liquid crystal display, the white colour point drift of the liquid crystal display being compensated through compensation applied to the first light emitting diode. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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Specification