Liquid Crystal Display Data Driver Charge Sharing for Low Temperature
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Solution Overview
Problem
Liquid crystal displays face challenges with reduced current characteristics in thin film transistors at low temperatures, leading to insufficient data voltage charging and display quality deterioration, especially when handling mixed color patterns.
Innovation Solution
The implementation of a charge sharing technique in the data driver, where odd and even channel data voltages with different polarities are shared based on temperature, to ensure sufficient charging and reduce power consumption, thereby improving current characteristics and preventing purplish and bar line phenomena.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data voltage is charged in thin film transistor at low temperature, then current characteristic is reduced, but data voltage cannot be sufficiently charged
Solution Approach 1:
The patent merges odd channel and even channel data voltages through charge sharing in the data driver. By combining charges from adjacent channels with different polarities, the system compensates for insufficient charging caused by reduced thin film transistor current characteristics at low temperatures, ensuring adequate voltage levels are achieved.
Solution Approach 2:
The patent changes the charging parameter by introducing temperature-based charge sharing. At low temperatures where thin film transistor charging is insufficient, the system activates charge sharing to supplement the charging process, effectively adapting the charging mechanism to temperature conditions.
2Manufacturing precision
If precharge driving mode is used to compensate charging time, then charging time is extended, but bar line appears and display quality deteriorates
Solution Approach 1:
Instead of extending charging time through precharge mode, the patent merges charges from odd and even channels. This charge sharing approach provides additional charge without requiring extended time, thereby avoiding the bar line artifact that occurs with precharge driving mode while still ensuring sufficient charging.
3Manufacturing precision
If charge sharing is performed between odd and even channels, then charging balance is improved, but power consumption increases
Solution Approach 1:
The patent converts the harmful effect of adjacent channels having opposite polarities into a beneficial charge sharing mechanism. By utilizing the voltage difference between odd and even channels, the system achieves charge balancing that improves charging uniformity across the display while managing power consumption through efficient charge transfer.
Data Source
AI summary
A liquid crystal display, including: pixels; a signal controller receiving an input image signal and an input control signal and outputting a processing image signal and a control signal; and a data driver changing the processing image signal to data voltage on the basis of the control signal to supply the data voltage to the pixel and sharing charges of odd channel data voltage of an odd channel and even channel data voltage of an even channel which have different polarities on the basis of a temperature.