Display Voltage Compensation During Blanking Interval
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Solution Overview
Problem
Existing display devices experience block dimming issues when varying voltage levels to compensate for environmental changes, as the voltage adjustments are perceived during image display periods, leading to a dimming effect across the screen.
Innovation Solution
The display device varies the supply voltage only during the blanking interval when no image is displayed, ensuring that voltage level changes do not occur during image display periods, thereby preventing block dimming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage level is varied to compensate for power supply fluctuations, then power supply compensation is improved, but block dimming occurs on the screen
Solution Approach 1:
The patent applies preliminary action by adjusting the voltage level during the blanking interval before the image display period begins. The timing controller detects the blanking interval and controls the power supply to vary voltage only during this time, preparing the system for stable operation during the subsequent image display without causing visible artifacts.
Solution Approach 2:
The patent segments the operation time into distinct periods: image display period and blanking interval. By identifying and separating these time segments, the system can apply different voltage control strategies to each - maintaining stable voltage during image display while allowing voltage adjustment during the blanking interval when no image is shown.
2Speed
If voltage level is adjusted during image display period, then power compensation response is improved, but display quality deteriorates due to block dimming
Solution Approach 1:
The system performs voltage adjustment in advance during the blanking interval, completing the power compensation action before the image display period starts. This ensures that when the image is displayed, the voltage has already stabilized at the appropriate level, providing both fast compensation response and high display quality.
Solution Approach 2:
The patent utilizes the periodic nature of display operation, where blanking intervals occur regularly between image display periods. By synchronizing voltage adjustments with these periodic blanking intervals, the system achieves consistent compensation response without compromising display quality across multiple frames.
Data Source
AI summary
A display device comprises a display panel, a drive circuit configured to drive the display panel, a timing controller configured to control the drive circuit, and a power supply configured to output a supply voltage to the display panel. The timing controller is configured to output a vertical synchronization signal having an image display period and a blanking interval. The power supply is configured to vary a level of the supply voltage during the blanking interval of the vertical synchronization signal.