Liquid Crystal Panel Driving Method for Low Temperature Grayscale Integrity
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Solution Overview
Problem
Existing liquid crystal panel technologies face challenges in maintaining display grayscale integrity in low temperature regions due to grayscale level 'turning over' issues, which complicates construction and increases power consumption.
Innovation Solution
A method for driving liquid crystal panels that modulates pulse width of driving signals based on temperature, adjusting pulse widths for brightest and darkest grayscale levels in low temperature regions by substituting them with intermediate levels from normal temperature regions, and incorporating hysteresis characteristics to prevent frequent changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pulse width is gradually changed from maximum to minimum value for all grayscale levels in low temperature region, then grayscale level turning over is prevented, but construction complexity increases and power consumption increases
Solution Approach 1:
The patent segments the grayscale levels into two groups: brightest grayscale level(s) and darkest grayscale level(s), and only adjusts the pulse width for these specific levels in low temperature region while maintaining normal pulse widths for intermediate grayscale levels. This selective approach prevents grayscale turning over without requiring complex adjustments across all grayscale levels.
Solution Approach 2:
The patent applies different pulse width adjustment strategies to different parts of the grayscale spectrum. Specifically, only the brightest and/or darkest grayscale levels receive modified pulse widths in low temperature region, while intermediate grayscale levels maintain their normal pulse widths. This localized adjustment reduces construction complexity compared to global adjustment.
2Reliability
If pulse width is gradually changed from maximum to minimum value for all grayscale levels in low temperature region, then grayscale level turning over is prevented, but power consumption increases
Solution Approach 1:
The patent segments the grayscale levels and only adjusts pulse width for the brightest and/or darkest grayscale levels in low temperature region, rather than adjusting all grayscale levels. This reduces the number of pulse width modifications needed, thereby reducing power consumption while still preventing grayscale turning over.
3Reliability
If multiple temperature patterns are prepared and gradual pulse width compensation is applied, then grayscale level turning over is prevented, but construction complexity increases
Solution Approach 1:
The patent extracts only the necessary pulse width adjustments for the brightest and/or darkest grayscale levels in low temperature region, removing the need for complex multi-pattern tables and gradual compensation mechanisms for all grayscale levels. This simplifies the construction while maintaining reliability.
Data Source
AI summary
A liquid crystal device is provided comprising: a liquid crystal panel displaying grayscale levels by applying a driving signal to a pair of electrodes having liquid crystal interposed therebetween and displaying white when voltage is applied, the driving signal having a pulse width that is modulated according to the grayscale level; a temperature detecting unit detecting a temperature of the liquid crystal panel; a discrimination unit discriminating whether the temperature detected by the temperature detecting unit is a predetermined threshold value or more; and a pulse width defining unit that defines the pulse width according to the grayscale level such that the pulse width of the driving signal is gradually increased as the grayscale level becomes bright when the temperature is the threshold value or more; and changes the pulse width such that the pulse width corresponding to the darkest grayscale level is larger than the pulse width corresponding to that at which the temperature is the threshold value or more when the temperature is less than the threshold value.