OLED Display Luminance Compensation Using Deterioration Curves
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Solution Overview
Problem
Display devices with light-emitting elements, such as organic light-emitting diodes, suffer from luminance degradation over time, necessitating effective compensation methods to maintain display quality.
Innovation Solution
A compensation method involving measuring luminance at multiple time points, plotting luminance changes, and storing compensation values in a look-up table to adjust image data based on the deterioration curve of light-emitting elements, ensuring consistent luminance levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If luminance is measured at multiple time points to create accurate deterioration curves for compensation, then compensation precision is improved, but measurement time and processing complexity increase
Solution Approach 1:
The patent performs preliminary luminance measurements at multiple time points (T1, T2, T3) to establish deterioration curves in advance. These curves are stored and reused for compensation, avoiding the need to repeatedly measure at all time points for each compensation cycle, thus reducing ongoing measurement time while maintaining precision
Solution Approach 2:
The patent measures luminance at more time points than strictly necessary (including T4 beyond the third time point), creating comprehensive deterioration data. This excessive measurement approach ensures accurate curve fitting and provides buffer data for various compensation scenarios, improving precision while the excess data is stored for future use
2Measurement precision
If deterioration curves are created for multiple gray scales to compensate for light-emitting element degradation, then compensation accuracy is improved, but device complexity increases
Solution Approach 1:
The patent divides the compensation task into separate deterioration curves for different gray scales (first gray scale and second gray scale). Each gray scale has its own dedicated curve, allowing independent optimization and simplifying the overall compensation process by handling each gray scale separately rather than as a complex unified system
Solution Approach 2:
The patent creates a universal compensation framework where deterioration curves for different gray scales are established once and then reused across multiple compensation operations. The same measurement and curve-fitting process serves multiple gray scales, reducing the need for separate complex systems for each gray scale
3Productivity
If compensation values are stored in a look-up table for quick retrieval, then compensation speed is improved, but memory requirements and data management complexity increase
Solution Approach 1:
The patent pre-calculates and stores compensation values in a look-up table during the initial measurement phase. These pre-computed values are retrieved directly during compensation operations without requiring complex real-time calculations, significantly improving compensation speed while the data management complexity is confined to the initial setup phase
Solution Approach 2:
The patent creates a simplified copy of the deterioration data in the form of a look-up table containing pre-computed compensation values. This tabular copy allows for extremely fast retrieval and simple data management compared to storing and processing the full raw measurement data, balancing speed improvement with manageable complexity
Data Source
AI summary
A compensation method of a display device includes storing a compensation value over time from a first time point to a third time point for a first gray scale based on a deterioration curve of a first gray scale, and storing a compensation value over time from a second time point to a fifth time point, based on the deterioration curve of the first gray scale. In the display device, the electronic device, and the compensation method thereof, it is possible to efficiently calculate the compensation value of the light-emitting element, and to compensate for deterioration of the light-emitting element.