H - Electricity – 03 – M
Patent
H - Electricity
03
M
H03M 1/10 (2006.01) G09G 3/36 (2006.01) H04N 5/66 (2006.01) H03M 1/74 (2006.01)
Patent
CA 2191510
Each of N current summation type digital-to-analog (D/A) converters of a liquid crystal display driver generates an analog signal which provides pixel video information. In an error sampling interval of the D/A converter, the output signal of the D/A converter developed when the data to be converted is at full scale is compared in a comparator with a reference voltage. An error signal is sampled and is used for varying a control voltage developed in a capacitor. The control voltage controls the current sources of the D/A converter in a current mirror manner. The reference voltage is coupled in common to each of the comparators of the D/A converters. In this way, matching among the D/A converters and the accuracy of each are enhanced.
Craig Wilson And Company
Thomson Multimedia S.a.
LandOfFree
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