LCD Over-Driving Control via Threshold-Based Frame Difference
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Solution Overview
Problem
Commercial LCD devices suffer from motion blur and visual picture-quality abnormalities due to noise-induced over-driving, which affects the visibility of motion images and increases power consumption.
Innovation Solution
An LCD device with a frame memory, data difference calculator, threshold determiner, comparator, and over-driver that selectively performs over-driving based on a data difference value and threshold values established across gray level ranges, minimizing unnecessary over-driving and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If over-driving is performed to enhance response time and reduce motion blur, then motion image quality is improved, but visual picture-quality abnormalities occur due to noise-induced false over-driving
Solution Approach 1:
The patent implements a feedback mechanism by comparing current frame pixel data with previous frame pixel data, and only performing over-driving when the difference exceeds a threshold value. This feedback loop prevents noise-induced false over-driving while maintaining response time enhancement for genuine motion changes.
Solution Approach 2:
The patent dynamically adjusts the over-driving parameter (pixel data gray level) based on the calculated difference between frames. When the difference exceeds the threshold, over-driving is applied; otherwise, normal display is maintained. This parameter-based control resolves the contradiction by adapting the over-driving intensity to actual motion needs.
2Speed
If over-driving is performed frequently to maintain high response time, then motion blur is minimized, but power consumption increases
Solution Approach 1:
The patent applies partial over-driving action by performing over-driving only when necessary (when frame difference exceeds threshold) rather than continuously. This partial action maintains adequate response speed for motion scenes while significantly reducing power consumption during static scenes.
Solution Approach 2:
The patent implements periodic checking of frame differences to determine when over-driving is needed. This periodic evaluation allows the system to alternate between over-driving mode and normal mode, optimizing the balance between response speed and power consumption based on actual content requirements.
Data Source
AI summary
An LCD device and an LCD driving method select one among a plurality of threshold values provided along gray level regions of the pixel data as a threshold value for pixel data in a current frame interval. Accordingly, the number of times over-driving occurs due to noise when a still image is displayed can be minimized.