OLED Display Driving Method Reducing Dynamic False Contours
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Solution Overview
Problem
Digital driving methods in organic light emitting display devices can result in dynamic false contours due to luminance deviations between pixels, particularly when displaying white images, which affect image quality.
Innovation Solution
A hybrid digital driving method that converts input data into mapped data using random data mapping information to ensure pixels have similar luminance, and selects sub-frame patterns based on white image gray level distribution to minimize dynamic false contours.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If digital driving method is used to simplify IC structure and achieve high resolution, then device complexity is reduced and manufacturing precision is improved, but dynamic false contours occur due to luminance deviations between pixels
Solution Approach 1:
The patent changes the driving parameters by implementing a hybrid digital-analog driving method that combines digital switching control with analog voltage modulation. This allows pixels to emit light at different luminance levels within the digital framework, thereby reducing dynamic false contours while maintaining the simplicity of digital driving architecture
Solution Approach 2:
The patent applies preliminary compensation by pre-calculating and storing compensation values for each pixel based on their individual luminance characteristics. Before actual image display, these compensation values are used to adjust the driving signals, preventing dynamic false contours from occurring in the first place
2Manufacturing precision
If pixels emit light in discrete on/off states for digital driving, then manufacturing precision and resolution are improved, but dynamic false contours appear due to luminance deviations
Solution Approach 1:
The patent applies local quality by providing individualized compensation for each pixel based on its specific luminance characteristics. Rather than using a uniform driving approach for all pixels, the system tailors the driving parameters to each pixel's unique properties, thereby reducing dynamic false contours while maintaining high resolution
Solution Approach 2:
The patent introduces dynamic adjustment by varying the luminance output within each pixel over time through multiple sub-frames. By controlling the duration and intensity of light emission in a dynamic manner, the system achieves grayscale representation that reduces dynamic false contours while maintaining manufacturing precision
Data Source
AI summary
A method of operating an organic light emitting diode (OLED) display device and an OLED display using the method are disclosed. In one aspect, input data is received, the input data is converted into mapped data based on random data mapping information, one sub-frame pattern is selected from a plurality of sub-frame patterns based on the random data mapping information, and an image is formed for the display device based on the mapped data and the selected sub-frame pattern.