Display Driving Dithering Maps to Prevent Flicker
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Solution Overview
Problem
Display devices face challenges in maintaining high display quality while reducing costs by using data drivers with less than the required data processing capability for grayscale representation, leading to issues like flicker and reduced display quality due to regular dithering patterns.
Innovation Solution
A driving controller that includes a memory for storing dithering maps, a random number generator to initialize with the same initial value per frame, and a dithering compensator circuit to randomly select and shift dithering maps for spatial compensation of input image data, eliminating temporal dithering and improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temporal dithering is used to process grayscale data, then display quality is improved, but flicker occurs and display quality deteriorates
Solution Approach 1:
The patent applies periodic action by using frame-based dithering cycles where the same dithering pattern is applied repeatedly across frames. The random number generator is reinitialized at the start of each frame, creating a periodic structure that eliminates temporal variations and prevents flicker while maintaining grayscale resolution through consistent spatial dithering patterns.
Solution Approach 2:
The patent introduces dynamics by using a random number generator that creates varied dithering patterns within each frame. The random values are shifted and combined with input image data to dynamically adjust grayscale representation on a per-pixel basis, allowing the system to adapt to different display conditions while maintaining overall image quality without temporal flicker.
2Measurement precision
If spatial dithering is used to express target grayscale between reference grayscales, then grayscale resolution is maintained, but regular dithering patterns reduce display quality
Solution Approach 1:
The patent applies asymmetry by using asymmetric dithering maps that are not uniform or regular in pattern. The dithering maps store varied grayscale transition patterns that are shifted and combined with input data, creating asymmetric distributions of grayscale values across pixels. This breaks the regularity of traditional dithering patterns and eliminates visible artifacts while preserving grayscale resolution.
Solution Approach 2:
The patent changes parameters by dynamically shifting dithering maps using random values. The shift amount varies based on the random number generator output, and the dithering maps are selectively applied based on input image data characteristics. This parameter variation prevents repetitive patterns and improves display quality while maintaining the ability to express intermediate grayscale values.
Data Source
AI summary
A driving controller includes a memory configured to store dithering maps, a random number generator configured to generate a random number having a same initial value for each frame, and a dithering compensator circuit configured to select an intermediate dithering map among the dithering maps based on the random number, shift the intermediate dithering map based on the random number to generate a compensation dithering map, and spatially compensate input image data using the compensation dithering map.