Display Compensation Module Reducing Motion Blur via Overdrive Frames
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Solution Overview
Problem
Liquid crystal display (LCD) devices suffer from motion blur due to the slow response time of liquid crystal molecules, which cannot adjust voltages quickly enough within a frame period, especially when displaying dynamic images, leading to a degradation in image quality.
Innovation Solution
A compensation method and module for the driving circuit that generates a motion vector between frames, creates an estimation frame based on this vector, adjusts it to form an overdrive frame, and inserts this frame between the current and next frames to reduce response time and increase frame rate, thereby reducing motion blur.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the liquid crystal molecules are used to display dynamic images, then the display device can show moving content, but the slow response time of liquid crystal molecules causes motion blur
Solution Approach 1:
The patent applies preliminary action by generating an overdrive frame before the actual frame transition occurs. The overdrive frame is created by estimating the motion vector between the current frame and next frame, then pre-adjusting the pixel values to compensate for the slow liquid crystal response. This allows the liquid crystal molecules to start transitioning earlier and reach the target state faster, reducing motion blur without requiring faster material response.
Solution Approach 2:
The patent changes the voltage parameter dynamically by generating an overdrive frame with adjusted pixel values. Instead of applying a constant voltage, the system calculates a compensated voltage value that accounts for the motion between frames. This parameter change allows the liquid crystal molecules to transition more quickly by applying a higher initial voltage that decays to the target voltage, effectively speeding up the response time.
2Productivity
If the frame rate is increased to reduce motion blur, then the display quality improves, but the storage requirements and processing complexity increase
Solution Approach 1:
The patent applies local quality by selectively processing only the regions of the image that contain motion. Instead of increasing the frame rate for the entire image, the system calculates motion vectors and generates overdrive frames only for pixels that have changed between frames. This localized approach reduces the storage requirements and processing complexity while still achieving the benefit of reduced motion blur in the moving regions.
Data Source
AI summary
A compensation method for a driving circuit of a display device includes generating a motion vector between a previous frame and a current frame subsequent to the previous frame; generating a first estimation frame according to the current frame and the motion vector; adjusting the first estimation frame according to the difference between the current frame and the first estimation frame, to generate a first overdrive frame; and inserting the first overdrive frame between the current frame and a next frame subsequent to the current frame.