Timing Controller Using Regional Gray-Level LUTs to Reduce Flicker
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Solution Overview
Problem
Existing display technologies face challenges in improving display quality, particularly in managing flicker and achieving optimal gray level representation across varying image content, which affects image clarity and user experience.
Innovation Solution
A timing controller that includes a gray level setting circuit to calculate representative gray levels by dividing the display region into multiple regions, a signal determining circuit to select an optimal lookup table based on these levels, and a correcting circuit to adjust the duty ratio of emission signals, thereby enhancing display quality by optimizing pixel driving frequencies and signal timings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single lookup table is used for emission signal duty ratio control, then device complexity is reduced, but display quality deteriorates due to inability to adapt to varying gray level distributions
Solution Approach 1:
The patent implements dynamic selection of lookup tables based on the gray level distribution characteristics of the input image. The system automatically switches between different lookup tables (e.g., first LUT for high gray level images, second LUT for low gray level images) to optimize display quality for varying content types, making the system adaptive rather than static
Solution Approach 2:
The patent changes the parameter of lookup table selection based on the gray level distribution parameters of the input image. By analyzing the gray level histogram and selecting appropriate lookup tables accordingly, the system optimizes emission signal duty ratios for different image characteristics without requiring a completely new control architecture
2Reliability
If fixed emission signal pulse width is used, then device complexity is reduced, but display quality deteriorates due to flicker and poor gray level representation
Solution Approach 1:
The emission signal pulse width is dynamically adjusted based on the selected lookup table and the gray level distribution of the input image. Instead of using a fixed pulse width, the system varies the pulse width adaptively to eliminate flicker and improve gray level representation, particularly in low gray level regions
Solution Approach 2:
The system uses feedback from the gray level histogram analysis to determine the appropriate emission signal characteristics. By continuously monitoring the gray level distribution and adjusting the emission signal accordingly, the system maintains high display quality across different image content
3Reliability
If uniform driving frequency is applied to all pixels, then device complexity is reduced, but display quality deteriorates due to inability to optimize for different image regions
Solution Approach 1:
The patent applies different driving parameters to different regions or groups of pixels based on the local gray level distribution characteristics. By dividing pixels into groups and applying region-specific lookup tables and emission signal adjustments, the system optimizes image clarity for each region while managing complexity through systematic grouping
Data Source
AI summary
A display device includes a display panel including a plurality of pixels in a display region defined therein to emit light based on an emission signal, and a timing controller to receive an image signal and drive the display panel. The timing controller includes a gray level setting circuit which calculates a plurality of representative gray levels by dividing the display region into a plurality of regions, based on the image signal, a signal determining circuit which receives a plurality of lookup tables storing a duty ratio of the emission signal and select one of the plurality of lookup tables, based on the plurality of lookup tables and the plurality of representative gray levels, and a correcting circuit which controls the duty ratio of the emission signal provided during a frame, based on the one of the plurality of lookup tables.