Pixel Overdrive Lookup Tables for Display Artifact Reduction
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Solution Overview
Problem
Electronic devices with displays, such as LCDs and OLEDs, experience undesirable visual artifacts like motion blur and color tails due to varying pixel brightness over time, which existing overdrive systems fail to fully address by not accounting for human perception and pixel response variations.
Innovation Solution
The implementation of pixel overdrive systems that use lightness blur edge width (LBEW) and blur edge width (BEW) to determine overdrive values for each grey-to-grey transition, stored in lookup tables and applied based on display frequency and temperature, to match the human eye's response and reduce motion blur and color tails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If existing overdrive systems are used to accelerate pixel response, then response speed is improved, but visible artifacts like motion blur and color tails still occur due to not accounting for human perception
Solution Approach 1:
The patent changes the parameters used in overdrive correction from simple pixel response time to multiple parameters including lightness blur edge width (LBEW) and blur edge width (BEW). These parameters are stored in lookup tables and selected based on the specific grey-to-grey transition, allowing optimization of both response speed and artifact reduction by adjusting overdrive values according to human perception characteristics.
Solution Approach 2:
The system dynamically selects different overdrive values from lookup tables based on the specific grey-to-grey transition being performed. Instead of using a fixed overdrive correction, the system adapts the overdrive strength according to the transition type, making the correction dynamic and context-dependent to minimize artifacts while maintaining fast response.
2Loss of time
If overdrive values are increased to reduce motion blur, then response time is improved, but color tails and other artifacts may worsen
Solution Approach 1:
The patent applies different overdrive correction strategies for different grey-to-grey transitions by using separate lookup tables for lightness transitions and color transitions. Lightness transitions use LBEW-based overdrive values optimized for reducing motion blur, while color transitions use BEW-based values optimized for preventing color tails. This local optimization ensures each transition type gets the appropriate correction strength.
Solution Approach 2:
The overdrive correction system is segmented into multiple lookup tables, each handling specific types of transitions. By dividing the correction task into separate lightness-based and color-based tables, the system can independently optimize overdrive values for each transition type, preventing the trade-off between motion blur reduction and color tail prevention.
3Device complexity
If simple overdrive correction is applied, then device complexity is minimized, but manufacturing precision and artifact reduction are insufficient
Solution Approach 1:
The patent pre-calculates and stores optimal overdrive values in lookup tables during manufacturing or initialization. The LBEW and BEW parameters are determined in advance for various grey-to-grey transitions, and the corresponding overdrive values are stored for rapid retrieval during operation. This preliminary action eliminates the need for complex real-time calculations, maintaining low device complexity while achieving high precision artifact reduction.
Data Source
AI summary
Aspects of the subject technology relate to display circuitry including pixel overdrive circuitry. The pixel overdrive circuitry includes one more lookup tables of boost values to be applied to pixel display values of a frame to be displayed, for overdrive of that frame. Each lookup table includes a lightness-blur-edge-width-based boost value. The lightness-blur-edge-width-based boost value matches a lightness-blur-edge-width of an intermediate grey-to-grey transition to a lightness-blur-edge-width of a maximum grey-to-grey transition.