Liquid Crystal Panel Gate Delay Compensation for Temperature Variations
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Solution Overview
Problem
Liquid crystal display devices using active matrix panels face issues with signal waveform bluntness at high temperatures, leading to display malfunctions, and insufficient charging at low temperatures due to variations in interconnection resistance and TFT on-current, making it difficult to maintain display quality across a wide temperature range.
Innovation Solution
A method of driving liquid crystal panels that includes a gate delay compensation period, adjustable based on ambient temperature, to synchronize the switching of gate selection signals with image data signals, ensuring proper pixel charging and reducing display unevenness by varying the gate delay compensation period in response to temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gate selection signal timing is shifted to compensate for signal delay at high temperature, then display malfunction due to waveform bluntness is remedied, but the charging time of pixels is reduced causing insufficient charging at low temperature
Solution Approach 1:
The gate delay compensation period is made variable based on detected ambient temperature. At high temperatures, a longer compensation period is applied to counteract increased signal delay and waveform bluntness. At low temperatures, the compensation period is reduced or eliminated to maintain sufficient charging time, thus dynamically adapting to temperature conditions to resolve the contradiction between preventing display malfunction and ensuring proper pixel charging.
Solution Approach 2:
The timing parameter of the gate selection signal is changed based on temperature conditions. By detecting ambient temperature and adjusting the gate delay compensation period accordingly, the system optimizes signal timing to compensate for temperature-dependent variations in interconnection resistance and signal propagation characteristics, thereby maintaining display quality across different temperature ranges.
2Reliability
If a fixed gate delay compensation period is used to address signal delay, then waveform bluntness at high temperature is compensated, but display unevenness occurs at low temperature due to reduced TFT on-current
Solution Approach 1:
The gate delay compensation period is dynamically adjusted based on detected ambient temperature. At high temperatures where waveform bluntness occurs, a longer compensation period is applied. At low temperatures where TFT on-current decreases, the compensation period is reduced to ensure sufficient charging time, thereby maintaining display uniformity across different temperature conditions.
Solution Approach 2:
The system detects ambient temperature and uses this feedback to adjust the gate delay compensation period. This closed-loop approach ensures that the timing compensation is optimized for current temperature conditions, preventing both waveform bluntness at high temperature and display unevenness at low temperature by adapting to real-time environmental changes.
Data Source
AI summary
Provided is a method of driving a liquid crystal panel by providing a gate delay compensation period to a timing at which gate selection signal waveforms supplied to horizontal scanning interconnections change so that a switching element changes from a conduction state to a non-conduction state with respect to a timing at which image data signal waveforms supplied to data interconnections change so that image data corresponding to display contents of a pixel electrode connected to the horizontal scanning interconnections changes to next image data, wherein an ambivalent temperature is detected to make the gate delay compensation period variable in accordance with the ambivalent temperature.