Dynamic Gate-On Period Adjustment for Display Luminance Control
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Solution Overview
Problem
Display devices face issues with insufficient light emission and luminance defects due to varying charging times for different colored pixels, especially when grayscale changes rapidly between frames, leading to screen drag and color blurring.
Innovation Solution
A display device with a panel driver that adjusts the gate-on period of the light emission control signal based on grayscale differences between successive frames, and includes a grayscale compensator to increase the grayscale of the current frame when significant differences are detected, ensuring adequate charging time for pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resolution of the display device is increased, then the image quality is improved, but the charging time of pixels decreases leading to insufficient light emission
Solution Approach 1:
The gate-on period is made dynamic by adjusting its length based on the grayscale difference between current and previous frames. When grayscale changes rapidly, the gate-on period is extended to provide sufficient charging time for pixels, while maintaining shorter periods during stable display conditions to preserve high resolution performance.
Solution Approach 2:
The patent changes the parameter of gate-on period length in response to grayscale variations. By detecting the grayscale difference between frames and adjusting the gate-on period accordingly, the system adapts the charging time to match the display requirements, resolving the conflict between high resolution and sufficient pixel charging.
2Speed
If the grayscale changes rapidly between frames, then the image update speed is improved, but some pixels fail to reach desired luminance causing screen drag
Solution Approach 1:
The system performs preliminary detection of grayscale differences between frames and proactively adjusts the gate-on period before the actual display update. This preliminary action ensures that pixels have sufficient charging time prepared in advance, preventing luminance deficiency and screen drag effects.
Solution Approach 2:
The patent implements a feedback mechanism where the grayscale difference between current and previous frames is continuously monitored. Based on this feedback, the gate-on period is automatically adjusted to maintain proper pixel charging, ensuring desired luminance is achieved even during rapid grayscale changes.
3Illumination intensity
If the gate-on period is extended to ensure sufficient charging time, then the luminance is improved, but the display response time increases
Solution Approach 1:
The gate-on period is dynamically adjusted based on actual display needs rather than being fixed. During rapid grayscale changes, the period is extended to ensure proper charging and luminance, while during stable display conditions, the period is reduced to minimize response time and maintain fast display performance.
Solution Approach 2:
The system changes the gate-on period parameter in response to grayscale difference detection. By adapting this parameter to match the actual charging requirements of pixels during different display conditions, the system achieves optimal luminance without unnecessary response time penalties.
Data Source
AI summary
A display device includes a display panel including a pixel, and a panel driver configured to change a length of a gate-on period of a light emission control signal provided to the pixel in a current frame on the basis of a difference between a grayscale of a previous frame and a grayscale of the current frame.