Reflector-Based Luminance Correction for OLED Uniformity
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Solution Overview
Problem
Image-quality distortions such as image sticking or mura occur in organic light emitting devices due to threshold voltage deviations of driving TFTs and degradation of organic light emitting elements, leading to luminance deviations and reduced display quality.
Innovation Solution
A test image measuring device and method that includes a display unit and an imaging unit positioned to capture a reflected test image through a reflector, allowing for the calculation of luminance correcting variables to correct pixel luminance and address image-quality distortions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a test image measuring device with reflector and imaging unit is implemented, then measurement precision and luminance correction capability are improved, but device complexity increases
Solution Approach 1:
A reflector is introduced as an intermediary component between the display device and the imaging unit. The reflector redirects light from the display device to the imaging unit, enabling luminance measurement without requiring the imaging unit to be positioned directly in front of the display. This intermediary structure achieves precise measurement while maintaining a compact device configuration.
Solution Approach 2:
The measurement system utilizes angular/directional dimension by positioning the imaging unit at an angle to the display device and using the reflector to redirect light. This dimensional approach allows the imaging unit to capture luminance information without being directly aligned with the display surface, reducing device complexity while maintaining measurement precision.
2Manufacturing precision
If luminance correction is applied to correct threshold voltage deviation and organic light emitting element degradation, then image quality and display uniformity are improved, but processing complexity increases
Solution Approach 1:
Luminance correction data is pre-calculated and stored for different aging stages of the organic light emitting element. When image quality distortion is detected, the system retrieves and applies the appropriate pre-computed correction data, avoiding the need for complex real-time calculations and simplifying the processing requirements while maintaining display uniformity.
Solution Approach 2:
The system implements a feedback mechanism where the imaging unit continuously monitors luminance uniformity, and the controller adjusts display parameters based on this feedback. This closed-loop control automatically compensates for threshold voltage deviation and element degradation, improving image quality without requiring complex manual intervention or processing.
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 corrects image-quality distortions, increasing the lifespan of the display device by ensuring uniform luminance across pixels, thereby preventing issues like image sticking and mura.
Implementation Method 1
a reflector inclined by a predetermined angle from another side of the housing facing the opening, where a display device including a display unit and an imaging unit is provided above the opening, and a test image displayed from the display unit is photographed by the imaging unit through the reflector
Data Source
AI summary
A display device relates to a test image measuring device, and includes a housing including one side in which an opening is defined, and a reflector provided to be inclined by a predetermined angle from another side of the housing facing the opening, where a display device including a display unit and an imaging unit is provided above the opening, and a test image displayed from the display unit is photographed by the imaging unit through the reflector.