LCD Driver Precharge Control for Low-Temperature Brightness Consistency
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Solution Overview
Problem
Existing liquid crystal display devices experience display quality deterioration at low temperatures due to the control of source line precharge operations in response to grayscale levels, leading to significant brightness variations between grayscale levels, especially between '127' and '128', which affects image quality.
Innovation Solution
A driver circuit with a temperature sensor that selectively performs precharge operations based on temperature ranges, either unconditionally performing or omitting precharge operations independently of grayscale levels at low temperatures, to maintain consistent brightness across grayscale levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the precharge operation is controlled in response to the grayscale level indicated by image data, then power consumption is reduced, but display quality deteriorates at low temperature due to significant brightness variations between grayscale levels
Solution Approach 1:
The patent applies parameter changes by modifying the precharge operation parameters (voltage level, timing, or enable/disable state) based on the detected temperature parameter. When temperature drops below a threshold, the system changes the precharge behavior to maintain consistent pixel brightness across grayscale levels, thereby resolving the display quality deterioration while preserving power consumption benefits through conditional parameter adjustment rather than unconditional operation changes
2Loss of energy
If the precharge operation is performed selectively based on grayscale level, then power consumption is reduced, but pixel brightness becomes inconsistent across different grayscale levels at low temperature
Solution Approach 1:
The patent changes the precharge operation parameters based on temperature detection. When temperature is below a threshold, it adjusts the precharge voltage or timing parameters to ensure that pixels at different grayscale levels achieve consistent brightness, while still maintaining selective precharge operation to preserve power consumption benefits
3Manufacturing precision
If the precharge operation is performed unconditionally for all grayscale levels, then display quality is maintained at low temperature, but power consumption increases
Solution Approach 1:
The patent applies dynamics by making the precharge operation adaptive rather than static. The system dynamically adjusts whether to perform precharge operation and what parameters to use based on real-time temperature detection. This allows the system to maintain high display quality when needed (low temperature) while conserving power when not needed (normal temperature), resolving the contradiction between display quality and power consumption
Data Source
AI summary
A driver includes a temperature sensor, a drive circuitry configured to drive a source line of a liquid crystal display panel, and a precharge circuitry configured to perform a precharge operation of the source line. When a measured temperature by the temperature sensor is in a first temperature range, the precharge circuitry selectively performs the precharge operation of the source line in response to the grayscale level indicated by the image data. When the measured temperature is in a second temperature range lower than the first temperature range, the precharge circuitry performs a selected one of first and second operations. The first operation includes unconditionally performing the precharge operation of the source line independently of the grayscale level indicated by the image data, and the second operation includes unconditionally omitting the precharge operation of the source line independently of the grayscale level indicated by the image data.