Pixel Compensation Timing Control for Variable-Frame-Rate Displays
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Solution Overview
Problem
Display devices experience deviations in electrical characteristics of driving transistors due to process deviations and deterioration, leading to sub-optimal image display and visual recognition issues like sensing horizontal lines.
Innovation Solution
A display device with a pixel unit and a compensator that detects and compensates for transistor characteristics, using a timing controller to adjust image data and supply compensation image data during blank periods to maintain consistent luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external compensation is performed using sensing horizontal lines during blank periods, then transistor characteristic deviation is compensated, but visual recognition of sensing horizontal lines occurs due to luminance decrease
Solution Approach 1:
The patent applies preliminary action by performing compensation sensing in advance during blank periods before the harmful visual recognition can occur. The sensing horizontal lines are processed and compensated for during the blank period when they are not visually perceived, preventing the harmful effect while maintaining the beneficial compensation function.
Solution Approach 2:
The patent converts the harmful visual recognition of sensing horizontal lines into a beneficial process by using the sensing period to perform compensation calculations. The same period that would normally cause visual artifacts is instead utilized to compute compensation values that improve display quality, effectively turning the harmful timing into a beneficial processing window.
2Productivity
If frame rate is varied to match rendering time, then display responsiveness improves, but blank period length changes causing luminance compensation errors
Solution Approach 1:
The patent applies dynamics by making the blank period length adjustable rather than fixed. The system dynamically modifies the blank period duration based on the current frame rate settings, allowing the sensing and compensation process to adapt to varying frame rates while maintaining accurate luminance compensation. This dynamic adjustment resolves the contradiction between frame rate flexibility and compensation precision.
Data Source
AI summary
A display device includes a pixel unit that includes a plurality of pixels, a compensator configured to receive sensing data from the pixel unit in a sensing period and that detects and compensates for a characteristic of the pixels, and a timing controller configured to convert an image signal received from an outside into image data.