Image Processing Circuit for LCD Overdrive Control
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Solution Overview
Problem
Liquid crystal displays face image quality degradation due to unnecessary overdrive processing applied to static images, which are incorrectly identified as moving images, leading to enhanced FRC processing and noise-related quality issues.
Innovation Solution
An image processing circuit with a quantization unit, threshold-value proximity determination unit, and moving-image/static-image determination unit accurately distinguishes between static and moving images by analyzing quantized data and threshold-value proximity, thereby controlling overdrive processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If image data is quantized with predetermined threshold values to reduce LUT data size, then the data amount in the LUT is reduced, but image data that is actually a static image is incorrectly determined to be a moving image when the change strides a quantization threshold value
Solution Approach 1:
A threshold value proximity determination unit is introduced as an intermediary component between the quantization unit and the moving image/static image determination unit. This unit determines whether image data is proximal to a threshold value and outputs threshold value proximity determination data, which serves as additional information to help accurately distinguish static images from moving images even when quantization causes threshold crossing
Solution Approach 2:
The solution adds another dimension of information by introducing threshold value proximity determination data alongside the quantized data. This creates a two-dimensional determination basis (quantized data difference + threshold proximity status) instead of relying solely on quantized data differences, enabling more accurate static/moving image classification
2Speed
If overdrive processing is performed on image data determined to be a moving image, then the response speed of the liquid crystal display is improved, but image quality degradation occurs due to enhanced FRC processing or noise when static images are incorrectly identified as moving images
Solution Approach 1:
The system uses feedback from the threshold value proximity determination unit to correct the moving image/static image determination. When quantized data suggests a moving image but threshold proximity data indicates the original data was near a threshold value, the system feedbacks this information to reclassify the image as static, thereby preventing inappropriate overdrive processing and the associated image quality degradation
Data Source
AI summary
The present invention provides an image processing circuit capable of properly determining whether or not image data is a static image or a moving image and performing overdrive processing thereon. The image processing circuit includes a quantization unit (quantization/threshold-value proximity determination circuit) for quantizing image data input to a liquid crystal display with a predetermined threshold value and outputting the quantized data, a threshold-value proximity determination unit (quantization/threshold-value proximity determination circuit) for determining whether or not the image data is proximal to the threshold value and outputting threshold-value proximity determination data, a moving-image/static-image determination unit (moving-image/static-image determination circuit) for determining whether or not the image data of a current frame is a static image or a moving image, on the basis of the quantized data and the threshold-value proximity determination data of the current frame and the quantized data and the threshold-value proximity determination data of the previous frame, and an overdrive processing unit (LUT, moving-image/static-image processing circuit) for outputting the image data which has been subjected to overdrive processing if the moving-image/static-image determination unit determines that the image data is a moving image.