OLED Display Compensation for Luminance Uniformity
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Solution Overview
Problem
OLED displays face challenges in maintaining uniform luminance due to non-uniformity in the threshold voltage/mobility of driving transistors and changes in OLED emission efficiency, leading to inconsistent image display.
Innovation Solution
An OLED display system that includes a luminance measuring unit, a current measuring unit, and a compensation data generating unit to produce compensation data based on luminance and current information, adjusting according to different gray scale ranges to optimize pixel performance and prevent moire patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single compensation method is used for all gray scales, then the device complexity is reduced, but the luminance uniformity deteriorates across different gray scale ranges
Solution Approach 1:
The patent segments the gray scale range into multiple regions (first gray scale range and second gray scale range) and applies different compensation methods to each region. For lower gray scales, luminance-based compensation is used, while for higher gray scales, current-based compensation is used. This segmentation allows optimal compensation for each gray scale region without requiring a single complex system to handle all cases uniformly.
Solution Approach 2:
The patent dynamically switches between different compensation methods based on the current gray scale value. The compensation type is not fixed but adapts according to the operating conditions (gray scale level), allowing the system to maintain luminance uniformity across the entire gray scale range by selecting the most appropriate compensation method for each specific condition.
2Stability of the object's composition
If gray scale-dependent compensation switching is implemented, then the luminance uniformity is improved, but the device complexity increases due to multiple measuring units and control logic
Solution Approach 1:
The patent divides the compensation functionality into specialized sub-units: a luminance measuring unit for low gray scales and a current measuring unit for high gray scales. Each unit is optimized for its specific operating range, improving measurement accuracy and compensation effectiveness while keeping each individual unit relatively simple.
Solution Approach 2:
The patent introduces a gray scale determining unit that acts as an intermediary to select which compensation method should be applied. This mediator component simplifies the overall control logic by automatically determining the appropriate compensation type based on the current gray scale value, reducing the need for complex manual intervention or sophisticated control algorithms.
3Device complexity
If only current measurement is used for compensation, then the device complexity is reduced, but the compensation accuracy deteriorates for low gray scale values
Solution Approach 1:
The patent applies the principle of local quality by using different measurement approaches optimized for specific local conditions (gray scale ranges). Luminance measurement is used locally for low gray scales where it provides better accuracy, while current measurement is used locally for high gray scales where it is more effective. This localized optimization ensures high measurement precision in each specific operating region.
4Device complexity
If only luminance measurement is used for compensation, then the device complexity is reduced, but the compensation accuracy deteriorates for high gray scale values
Solution Approach 1:
The patent implements local quality optimization by selecting the appropriate measurement method based on the local operating conditions. For high gray scale values, current measurement provides superior accuracy and is therefore applied in that specific region, while luminance measurement is applied in the low gray scale region where it excels. This ensures maximum measurement precision across the entire operating range.
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 system enables the display of images with substantially uniform luminance by generating compensation data that accounts for variations in pixel characteristics, improving image quality and addressing issues of non-uniformity and efficiency degradation.
Implementation Method 1
a luminance measuring unit configured to measure luminance of each pixel and generate luminance information corresponding to the measured luminances
Implementation Method 2
a current measuring unit configured to measure current output from each pixel and generate current information corresponding to the measured currents
Implementation Method 3
OLED displays can display images using OLEDs which emit light through the recombination of electrons and holes
Data Source
AI summary
An organic light-emitting diode (OLED) display is disclosed. In one aspect, the OLED display includes a plurality of pixels, a luminance measuring unit, a current measuring unit, and a compensation data generator. The luminance measuring unit measures the luminance of each pixel and generates luminance information corresponding to the measured luminances. The current measuring unit measures the current output from each pixel and generates current information corresponding to the measured currents. The compensation data generator generates compensation data including a compensation value for each pixel based on the luminance information and/or the current information.