Liquid Crystal Display Driver Pattern Analysis Dithering
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Solution Overview
Problem
Existing frame rate control (FRC) dithering methods in liquid crystal displays degrade picture quality due to their uniform application across all inversion modes and image characteristics, leading to issues like flicker and noise, especially in patterns such as dot or horizontal/vertical striped patterns.
Innovation Solution
An apparatus and method that analyzes input image data patterns to select optimal FRC dithering patterns, minimizing interference between image patterns and dithering patterns, thereby improving picture quality by dynamically adjusting dithering based on image characteristics and inversion modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed FRC dithering pattern is used for all images, then the device complexity is reduced and operation is simplified, but picture quality degrades due to flicker and interference patterns
Solution Approach 1:
The patent implements dynamic selection of FRC dithering patterns based on image content analysis. The system analyzes input image characteristics and automatically selects the most appropriate dithering pattern from multiple available patterns, transforming the static dithering approach into a dynamic adaptive one that responds to image content, thereby eliminating flicker and interference while maintaining operational simplicity
Solution Approach 2:
The patent changes the parameter of dithering pattern selection based on image characteristics. By analyzing image content and selecting different dithering patterns (changing the pattern parameter) suited to different image types, the system resolves the contradiction between operational simplicity and picture quality, avoiding the harmful effects of using a single fixed pattern
2Device complexity
If FRC dithering is applied uniformly regardless of inversion mode, then the device structure is simplified, but picture quality deteriorates due to flicker in specific patterns
Solution Approach 1:
The patent applies different dithering patterns to different local conditions (inversion modes and image characteristics). Instead of using a uniform dithering approach throughout, the system selectively applies specific patterns based on the local characteristics of the image content and inversion mode, thereby eliminating flicker and noise while keeping the overall system structure relatively simple
Solution Approach 2:
The system dynamically adapts the dithering pattern selection to match the inversion mode and image characteristics. This dynamic adaptation allows the system to maintain a simple overall structure while avoiding the harmful effects of uniform dithering application, as the pattern selection automatically responds to changing conditions
3Object-affected harmful factors
If multiple dithering patterns are stored and selected based on image analysis, then picture quality is improved by preventing interference, but the device complexity increases due to additional analysis and selection mechanisms
Solution Approach 1:
The patent stores multiple FRC dithering patterns in advance, prepared for different image characteristics and inversion modes. This preliminary preparation allows the system to quickly select the appropriate pattern without complex real-time calculations, improving picture quality while limiting the increase in device complexity through pre-computed pattern libraries
Data Source
AI summary
An apparatus for driving a liquid crystal display device, and which includes an image analyzer configured to compare a pattern of input image data with a plurality of stored patterns of image data, to determine a stored pattern of image data from the plurality of stored patterns of image data that is most similar to the pattern of the input image data, and to output a pattern analysis signal indicating the determined stored pattern, and a dithering unit connected to the image analyzer and configured to select a dithering pattern based on the output pattern analysis signal, to dither the input image data based on the selected dithering pattern, and to output a dither-processed image data.