Display Driving Compensation for Gray Value Transitions
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Solution Overview
Problem
Conventional display technologies face issues of color shifts and insufficient luminance due to insufficient charging time when switching from low to high gray values, particularly at higher refresh rates.
Innovation Solution
A display device and driving method that determine gray value differences and generate compensation data to adjust the driving data, ensuring sufficient charging time by comparing the current gray values with predefined reference values to optimize the charging process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the refresh rate is increased to improve display quality, then the display resolution and refresh rate are improved, but the charging time for each row of pixels is reduced, causing color shifts and insufficient luminance
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing compensation data in a lookup table before the actual display operation. When a gray value change is detected, the system queries the pre-prepared compensation data based on the gray value difference, avoiding the need for real-time complex calculations and ensuring sufficient charging time even at high refresh rates
Solution Approach 2:
The patent changes the parameter of driving current dynamically based on the gray value difference. By adjusting the driving current according to the specific gray value transition (e.g., using different compensation currents for different gray value differences), the system ensures adequate charging time for each row while maintaining high refresh rate operation
2Productivity
If the charging time is reduced to maintain high refresh rate, then the productivity is improved, but the luminance and color accuracy deteriorate due to insufficient charging
Solution Approach 1:
The patent dynamically adjusts the driving current parameter based on the gray value difference. For larger gray value differences, the system applies larger compensation currents to ensure sufficient charging and maintain luminance, while for smaller differences, it uses appropriate smaller currents, thus maintaining both high refresh rate and display quality
Solution Approach 2:
The system implements feedback by detecting the actual gray value change and using this information to determine the appropriate compensation data. The feedback loop ensures that the charging process is adjusted according to the actual display requirements, preventing luminance deficiency while maintaining high refresh rate
3Productivity
If the charging time is insufficient to switch from low to high gray values, then the refresh rate can be maintained high, but color shifts occur due to inadequate charging
Solution Approach 1:
The patent applies parameter changes by adjusting the driving current based on the specific gray value transition. Different compensation currents are applied for different gray value differences, ensuring that the charging process is optimized for each specific transition type and preventing color shifts while maintaining high refresh rate
Solution Approach 2:
The system performs preliminary action by pre-calculating compensation data for various gray value differences and storing it in advance. When a gray value change is detected, the corresponding compensation data is immediately retrieved and applied, ensuring accurate color reproduction without the delays associated with real-time calculation
Data Source
AI summary
A display device and a driving method are proposed to obtain the gray value difference data of the display device when the gray value of the display device changes. So, the display device could determine the corresponding compensation data according to the gray value difference of the display device and then the compensation data and the driving data are used to drive the display device. In this way, the driving data are compensated when the display device has a variance of gray value such that the charging operation becomes sufficient to charge the display device. For example, the charging speed becomes faster to allow the display device to reach sufficient luminance such that the issues of color shifts or insufficient luminance could be avoided.