OLED Display Driver Dynamic Reference Grayscale Adjustment
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Solution Overview
Problem
Organic light emitting display devices experience blurring due to instability in luminance to current efficiency, particularly when the grayscale value of a pixel is lower than a set level, leading to reduced image quality.
Innovation Solution
An organic light emitting display device that determines a reference grayscale value based on variables such as temperature, emission time, and wavelength of the selected pixel, using a display panel driver to identify low grayscale pixels and adjust their values to either black or higher grayscale values, thereby stabilizing luminance to current efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the grayscale value of a pixel is kept low to maintain image detail, then the image quality is improved, but the luminance to current efficiency becomes unstable causing blurring
Solution Approach 1:
The patent dynamically changes the reference grayscale value parameter based on temperature conditions. When the display panel temperature exceeds a threshold, the reference grayscale value is increased to shift low grayscale pixels to higher grayscale values or black, thereby stabilizing luminance to current efficiency and eliminating blurring while maintaining image quality through context-dependent parameter adjustment
2Reliability
If the reference grayscale value is increased to eliminate blurring, then the luminance stability is improved, but the image detail in low grayscale regions is lost
Solution Approach 1:
The patent applies local quality by selectively adjusting only those pixels identified as low grayscale pixels based on their relationship to the dynamic reference grayscale value. This localized adjustment approach maintains luminance stability for affected pixels while preserving image detail in other regions, avoiding global grayscale shifts that would degrade overall image quality
3Reliability
If the grayscale values are dynamically adjusted based on temperature, then the blurring is reduced, but the device complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the temperature of the display panel is continuously monitored and used to dynamically adjust the reference grayscale value. This feedback loop enables automatic adaptation to thermal conditions, reducing blurring through real-time parameter optimization while keeping the control mechanism relatively simple by relying on temperature sensing and predefined adjustment rules
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces blurring by stabilizing the luminance to current efficiency of organic light emitting diodes, improving image quality by adjusting grayscale values based on measured reference variables, ensuring consistent performance across varying conditions.
Implementation Method 1
The organic light emitting display device exploits the property in which an organic light emitting diode emits light when conducted
Data Source
AI summary
An organic light emitting display device includes a display panel having pixels and a display panel driver driving the display panel. Each of the pixels includes an organic light emitting diode, and the display panel driver selects one of the pixels, determines a reference grayscale value, compares a grayscale value, and determines the selected pixel as a low grayscale pixel when the grayscale value is lower than the reference grayscale value and higher than a black grayscale value. Some of the low grayscale pixels display the black grayscale value when there are more than one neighboring low grayscale pixels. The reference grayscale value is determined based on a reference grayscale variable, and the reference grayscale variable includes at least one of a temperature of the display panel, a time period when the selected pixel emits light, and a wavelength of light emitted by the selected pixel.