A 10-Bit LCD Column Driver With Piecewise Linear Digital-to-Analog Converters

A 10-bit LCD column driver, consisting of piecewise linear digital to analog converters (DACs), is proposed. Piecewise linear compensation is utilized to reduce the die area and to increase the effective color depth. The data conversion is carried out by a resistor string type DAC (R-DAC) and a char...

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Bibliographic Details
Published in:IEEE journal of solid-state circuits 2008-02, Vol.43 (2), p.371-378
Main Authors: LU, Chih-Wen, HUANG, Lung-Chien
Format: Article
Language:English
Subjects:
Active matrix liquid crystal displays
Applied sciences
Channels
Charge
Circuit properties
Column driver
Compensation
Computer displays
Data conversion
Design. Technologies. Operation analysis. Testing
Digital to analog converters
Digital-analog conversion
digital-to-analog converter (DAC)
Display
Drivers
Electric potential
Electric, optical and optoelectronic circuits
Electrodes
Electronic circuits
Electronic equipment and fabrication. Passive components, printed wiring boards, connectics
Electronics
Exact sciences and technology
Integrated circuits
LCD-TV
Liquid crystal displays
Piecewise linear techniques
Resistors
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Signal convertors
Timing
Voltage
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Summary:A 10-bit LCD column driver, consisting of piecewise linear digital to analog converters (DACs), is proposed. Piecewise linear compensation is utilized to reduce the die area and to increase the effective color depth. The data conversion is carried out by a resistor string type DAC (R-DAC) and a charge sharing DAC, which are used for the most significant bit and least significant bit data conversions, respectively. Gamma correction voltages are applied to the R-DAC to lit the inverse of the liquid crystal trans-mittance-voltage characteristic. The gamma correction can also be digitally fine-tuned in the timing controller or column drivers. A prototype 10-bit LCD column driver implemented in a 0.35-mum CMOS technology demonstrates that the settling time is within 3 mus and the average die size per channel is 0.063 mm 2 , smaller than those of column drivers based exclusively on R-DACs.
ISSN:0018-9200
1558-173X
DOI:10.1109/JSSC.2007.914274