Dynamic Overdrive Strength Adjustment for Display Panels
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Solution Overview
Problem
Existing display control technologies for liquid crystal displays (LCDs) face issues with errors introduced during encoding and decoding of image data, leading to observable chromatic defects when using high compression ratios, which affect the accuracy of overdrive operations.
Innovation Solution
A method and apparatus for dynamic overdrive strength adjustment, which encodes image data, performs block error estimation, and adjusts overdrive strength based on quantized error values to minimize errors and chromatic defects during the display of subsequent images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If image data is encoded with high compression ratio to reduce memory requirement, then storage space is reduced, but encoding and decoding errors increase leading to chromatic defects
Solution Approach 1:
The patent performs block error estimation on the current image before displaying the next image, and uses the estimated error information to adjust overdrive strength in advance. This preliminary error assessment and compensation mechanism prevents chromatic defects caused by compression errors before they manifest in the displayed image.
Solution Approach 2:
The patent dynamically adjusts the overdrive strength parameter based on quantized block error values. By changing the overdrive strength parameter according to estimated error levels, the system compensates for compression-induced inaccuracies and maintains display quality despite using high compression ratios.
2Speed
If overdrive voltages are applied to accelerate liquid crystal rotation, then response time is reduced, but encoding and decoding errors cause incorrect channel levels leading to chromatic defects
Solution Approach 1:
The patent implements a feedback mechanism where block error estimation results from the current image are used to adjust overdrive strength for the next image. This closed-loop approach continuously compensates for errors introduced by compression and overdrive operations, maintaining channel level accuracy while preserving fast response times.
Solution Approach 2:
The patent makes the overdrive strength dynamic rather than fixed. By adjusting overdrive strength based on real-time error estimation from compressed image data, the system adapts to varying error conditions while maintaining both speed and precision across different image content and compression levels.
Data Source
AI summary
A method and apparatus for performing display control of a display panel to display images with aid of dynamic overdrive (OD) strength adjustment is provided. Each of the images includes a plurality of blocks, each of the plurality of blocks includes a plurality of pixels, and each of the plurality of pixels comprising a plurality of sub-pixels. The method comprising: encoding image data of a current image to generate encoded image data of the current image, wherein the encoded image data is compressed data of the image data; decoding the encoded image data of the current image to generate decoded image data of the current image; performing block error estimation to generate quantized block error values of the plurality of blocks, respectively; determining OD depressed gains, respectively; and adjusting OD strength of corresponding blocks within a next image, respectively, for controlling the display panel to display the next image.