OLED Illumination Compensation via Voltage Mapping
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Solution Overview
Problem
AMOLED display technologies face nonuniform luminance issues due to manufacturing heterogeneities and differences in driving thin-film transistors, leading to IR-drop phenomena that result in reduced brightness and unsatisfactory display effects, especially as distance from the PMIC increases.
Innovation Solution
An OLED illumination compensating method that detects brightness and driving voltage values at predetermined gray levels, calculates equivalent line resistance, and establishes a mapping relationship to adjust target driving voltage values, compensating for brightness across pixel units to improve uniformity and display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If external optical de-mura compensation is used to compensate for nonuniform luminance, then the display effect is improved to some extent, but the mura caused by R-drop cannot be efficiently reduced and brightness uniformity remains unsatisfactory
Solution Approach 1:
The patent changes the compensation parameter from optical properties to electrical parameters (voltage and current). By measuring actual voltage values at different pixel locations and calculating compensation voltages based on these measurements, the system directly addresses the electrical causes of nonuniform luminance rather than attempting to correct optical symptoms, thereby achieving superior brightness uniformity
Solution Approach 2:
The patent replaces the optical de-mura compensation system with an electrical compensation system. Instead of using optical components and methods to correct display nonuniformity, the invention uses voltage measurement and electrical signal processing to compensate for R-drop effects, achieving more effective correction of the underlying electrical causes
2Reliability
If complicated compensating circuits are used to reduce Vth effects, then compensation performance is improved, but the aperture ratio of pixels is reduced and PPI performance is restricted
Solution Approach 1:
The patent extracts the essential compensation function from complex circuit implementations and implements it through simplified voltage measurement and calculation. By separating the compensation logic from the pixel circuit structure, the invention achieves effective compensation without adding circuit complexity that would reduce aperture ratio
Solution Approach 2:
The patent creates a universal compensation method that can be applied to various pixel structures and display configurations without requiring specific circuit modifications. The voltage measurement and calculation approach works across different OLED implementations, providing versatile compensation capability without compromising pixel design flexibility
Data Source
AI summary
An organic light emitting diode (OLED) illumination compensating method and device includes obtaining a plurality of first brightness values and corresponding actual driving voltage values; establishing a mapping relationship between brightness values and actual driving voltage values based on the plurality of first brightness values and the plurality of actual driving voltage values; obtaining target brightness values of the plurality of pixel units, and obtaining target driving voltage values of the plurality of pixel units by way of calculation based on the mapping relationship and the target brightness values; compensating for brightness of the plurality of pixel units based on the target driving voltage values and current actual driving voltage values.