LCD Over Driving Voltage Compensation for Gray Scale Accuracy
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Solution Overview
Problem
Current over driving methods in LCDs lead to inaccurate gray scale display due to the influence of pre-charging, resulting in distortion and a negative impact on the display effect.
Innovation Solution
A display panel driving method that determines an over driving voltage and pre-charging gray scale using look-up tables, and calculates a target gray scale by offsetting the pre-charging influence, ensuring accurate gray scale display by adjusting the driving voltage based on the target gray scale.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If pre-charging function is used to reduce charging time, then charging speed is improved, but gray scale display accuracy deteriorates
Solution Approach 1:
The patent applies preliminary anti-action by calculating a compensation value based on the pre-charging gray scale difference before the actual charging process. This compensation value is used to adjust the target gray scale, thereby offsetting the adverse effect of pre-charging on gray scale accuracy. The method proactively counteracts the pre-charging influence rather than passively accepting the gray scale deviation.
Solution Approach 2:
The patent implements feedback by using the pre-charging gray scale difference as feedback information to adjust the target gray scale. The system calculates the difference between the pre-charging gray scale and the original gray scale, then uses this feedback to compensate and correct the target gray scale, ensuring accurate gray scale display despite the pre-charging operation.
2Speed
If over driving voltage is applied to quickly flip liquid crystal pixel, then response time is improved, but gray scale display accuracy deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the target gray scale parameter based on the pre-charging gray scale difference. Instead of using a fixed target gray scale, the system modifies this parameter in real-time to compensate for pre-charging effects, thereby maintaining gray scale accuracy while still utilizing over-driving voltage for fast response.
Solution Approach 2:
The system uses feedback from the pre-charging gray scale measurement to adjust the target gray scale parameter. This feedback mechanism ensures that the over-driving operation achieves both fast response time and accurate gray scale display by continuously correcting the target parameter based on actual pre-charging conditions.
Data Source
AI summary
A display panel driving method, a driving apparatus, and a display apparatus are provided. The method includes: determining an over driving voltage according to a first display gray scale and second display gray scale, the first display gray scale a display gray scale of a target pixel cell in a current frame, the second display gray scale a display gray scale of the target pixel cell in a previous frame; determining a pre-charging gray scale according to the second display gray scale and a third display gray scale, the third display gray scale a display gray scale of a row above the target pixel cell in the current frame; determining a target gray scale according to the over driving gray scale and pre-charging gray scale; determining a target driving voltage according to the target gray scale, and driving the target pixel cell based on the target driving voltage.