LCD Control Circuit Edge Detection Memory Optimization
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Solution Overview
Problem
The large memory size required to store gray level values of all pixels in liquid crystal display (LCD) panels for overdriving procedures is costly and inefficient, as it necessitates significant storage capacity to ensure accurate voltage control for rapid image rendering.
Innovation Solution
An LCD control circuit and method that detects image edges in each frame, separating pixel data into edge and non-edge data, allowing only edge data to require overdriving voltage settings, thereby reducing memory needs by storing only edge data and using a weighted circuit to adjust voltage settings for efficient voltage supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gray level values of all pixels are stored in frame memory for overdriving procedures, then accurate voltage control is achieved, but memory size becomes large and costly
Solution Approach 1:
The patent segments the frame memory storage by dividing pixels into edge pixels and non-edge pixels. Only edge pixels require overdriving voltage control and are stored in frame memory, while non-edge pixels use current frame data directly. This segmentation reduces memory size while maintaining voltage control accuracy for pixels that need it.
Solution Approach 2:
The patent applies different quality treatment to different regions: edge pixels receive full overdriving voltage control with previous frame data storage, while non-edge pixels use simplified control without storing previous frame data. This local differentiation optimizes memory usage while ensuring accurate voltage control where needed.
2Speed
If frame memory stores all pixel data for overdriving, then response time is reduced, but manufacturing cost increases
Solution Approach 1:
The patent segments pixel processing into edge and non-edge categories, applying overdriving procedures only to edge pixels. This reduces memory requirements and manufacturing cost while maintaining fast response times for critical edge regions that define image transitions.
Solution Approach 2:
The patent applies overdriving procedures partially - only to edge pixels rather than all pixels. This partial action achieves sufficient response time improvement for image quality while reducing memory size and manufacturing cost compared to applying overdriving to all pixels.
3Productivity
If all pixels undergo overdriving procedures, then image rendering speed is improved, but memory requirements increase
Solution Approach 1:
The patent segments the image processing by identifying edge pixels that require overdriving for fast rendering. Only these edge pixels are stored in frame memory and processed with overdriving procedures, while non-edge pixels are rendered using current frame data, reducing memory capacity requirements while maintaining rendering speed.
Solution Approach 2:
The patent extracts only the essential edge pixel data from the complete frame and stores it in frame memory. This extraction approach provides sufficient image rendering speed by processing critical edge regions quickly, while avoiding the need to store and process all pixel data, thus reducing memory capacity requirements.
Data Source
AI summary
A liquid crystal display (LCD) control circuit is disclosed. The control circuit includes an edge detecting circuit for detecting image edges in each frame of an image data, and outputting an edge data and a non-edge data; a memory for saving the edge data of the frame; a driving decision circuit for generating a driving voltage setting according to the non-edge data of a current frame, and generating an overdriving voltage setting according to the edge data of a previous frame saved in the memory and the edge data of the current frame outputted by the edge detecting circuit; and an output device for outputting the driving voltage setting and the overdriving voltage setting.