Mura Compensation Circuit Using Curve Equation for OLED Panels
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Solution Overview
Problem
Existing Mura compensation methods for OLED panels require storing large amounts of pixel data and multiple lookup tables for different frame refresh rates, increasing manufacturing costs and complexity.
Innovation Solution
A display device with a Mura compensation circuit that defines a compensation area based on a curve equation corresponding to the current frame rate, calculates compensation weights, and uses these weights to compensate pixel data, thereby improving Mura uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple lookup tables for different frame refresh rates are stored to compensate Mura, then Mura compensation accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The patent changes the parameter from storing complete lookup tables to storing only curve equation coefficients. By representing the compensation data through mathematical parameters (coefficients a, b, c in the curve equation y=ax²+bx+c) rather than full lookup tables, the storage requirement is dramatically reduced while maintaining the ability to generate accurate compensation values for any frame rate through equation calculation
Solution Approach 2:
Instead of storing actual compensation data for every frame rate scenario, the patent creates a simplified mathematical model (curve equation) that can generate the necessary compensation values on-demand. This copying approach replaces large data sets with compact mathematical representations that can be computationally expanded when needed
2Measurement precision
If large amounts of pixel data are stored for Mura compensation, then compensation precision is improved, but device complexity increases
Solution Approach 1:
The patent transforms the compensation approach from storing extensive pixel data to storing minimal curve parameters. The curve equation coefficients (a, b, c) serve as compact parameters that define the entire compensation profile, reducing data storage requirements while preserving compensation precision through mathematical calculation
Solution Approach 2:
The patent extracts only the essential information needed for compensation—the curve equation coefficients—from the complete set of compensation data. By taking out only the critical parameters that define the Mura compensation characteristics, the system achieves the same compensation precision with dramatically reduced data storage
3Adaptability or versatility
If different Mura compensation lookup tables are stored for different frame refresh rates, then adaptability to different usage scenarios is improved, but loss of information is reduced
Solution Approach 1:
The patent uses parameter-based curve equations that can dynamically adapt to different frame rates through calculation rather than storing separate data tables for each frame rate. The same set of coefficients can generate appropriate compensation values for any frame rate scenario, providing full adaptability with minimal storage
Solution Approach 2:
The curve equation with its coefficients serves as a universal compensation model that works across all frame rates. Rather than requiring frame rate-specific lookup tables, this single mathematical model can be applied universally to generate compensation values for any display refresh rate, eliminating the need for multiple specialized data sets
Data Source
AI summary
The invention provides a display device and a Mura compensation method thereof. The display device includes a display panel and a Mura compensation circuit. The Mura compensation circuit defines a compensation area in the display panel based on a curve equation corresponding to a current frame rate of the display panel. The Mura compensation circuit calculates a compensation weight in the compensation area based on the current frame rate and the curve equation. The Mura compensation circuit uses the compensation weight to compensate a pixel data in the compensation area so as to generate a compensated pixel data frame. The Mura compensation circuit provides the compensated pixel data frame to the display panel for displaying images.