Dynamic Reference Voltage Control for Variable-Refresh Displays
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Solution Overview
Problem
Display devices experience flickering and stress on pixels due to variable frame rates in video content, leading to a diminished user experience and reduced image quality over time.
Innovation Solution
An electronic device adjusts the reference voltage of pixels based on the frequency of image data, using a scaler circuit to dynamically control the voltage supply and buffer frames, ensuring proper discharge rates and reducing flickering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display device uses variable frame rates to render complex images, then image complexity and data processing capability are improved, but pixel discharge completeness deteriorates causing flickering
Solution Approach 1:
The reference voltage is dynamically adjusted based on the frame rate of incoming image data. When the frame rate exceeds a threshold, the reference voltage is increased to accelerate pixel discharge. This dynamic adjustment allows the display device to adapt to variable frame rates while maintaining complete pixel discharge, eliminating flickering while supporting complex image rendering.
Solution Approach 2:
The patent changes the reference voltage parameter in response to frame rate variations. By monitoring the frame rate and adjusting the reference voltage accordingly, the system ensures that pixels have sufficient discharge time even at higher frame rates, preventing the flickering effect while maintaining the ability to render complex images at variable rates.
2Stability of the object's composition
If the display device refreshes at high frequency to prevent tearing, then image continuity is improved, but pixel discharge time is reduced causing stress on pixels
Solution Approach 1:
The reference voltage is adjusted as a function of frame rate to maintain adequate discharge time. When frame rates increase, the reference voltage increases proportionally, ensuring that pixels can discharge completely even with reduced discharge time. This parameter adjustment reduces pixel stress while maintaining image continuity and preventing tearing.
3Reliability
If the display device uses fixed reference voltage for stable operation, then operational stability is improved, but adaptability to variable frame rates deteriorates causing flickering
Solution Approach 1:
The system transitions from a fixed reference voltage to a dynamic reference voltage that adjusts based on frame rate. This dynamic approach maintains operational stability by ensuring complete pixel discharge at any frame rate while providing adaptability to handle variable frame rates from different video sources, eliminating flickering without sacrificing stability.
Data Source
AI summary
In some examples, an electronic device comprises a voltage supply circuit to provide a reference voltage usable to discharge pixels in a display device; and a scaler circuit coupled to the voltage supply circuit. The scaler circuit is to buffer first and second frames and dynamically control the voltage supply circuit to modify the reference voltage based on a frequency of the first frame differing from a frequency of the second frame.