Organic EL Display Pixel Alignment and Luminance Correction
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Solution Overview
Problem
The existing methods for manufacturing organic electroluminescent (EL) displays face challenges in accurately aligning the imaging device with the organic EL panel during the lighting inspection, leading to undetectable pixels and luminance unevenness, which affects the quality of the display.
Innovation Solution
A method that involves lighting up specific target pixels, detecting undetectable pixels, increasing their luminescence to a detectable level, and aligning the imaging device and organic EL panel to ensure proper alignment and correction of luminance unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the imaging device is used to photograph the organic EL panel for lighting inspection, then luminance unevenness can be detected and corrected, but the relative position alignment between the imaging device and the organic EL panel becomes difficult to achieve accurately
Solution Approach 1:
The patent applies preliminary action by detecting undetectable pixels before final alignment is completed. The system identifies pixels that cannot be detected due to misalignment, increases their luminescence, and then uses this information to adjust the relative position between the imaging device and the organic EL panel, ensuring all pixels become detectable in subsequent inspections.
Solution Approach 2:
The patent changes the luminescence parameter of undetectable pixels by increasing their amount of luminescence. This parameter change makes previously undetectable pixels visible to the imaging device, enabling the system to identify alignment issues and perform corrections based on the detected pixel positions.
2Reliability
If lighting target pixels are photographed to detect luminance unevenness, then correction can be applied, but some pixels remain undetectable due to misalignment or low luminescence
Solution Approach 1:
The patent implements feedback by using the detection results to identify undetectable pixels, increasing their luminescence, and then performing subsequent detections. This closed-loop feedback ensures that all pixels are eventually detected and inspected, improving the reliability of the luminance unevenness detection while recovering information that would otherwise be lost.
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
This approach allows for improved alignment and correction of luminance unevenness, enhancing the image quality of the organic EL display by ensuring all target pixels are detectable and minimizing the impact of lens aberration.
Implementation Method 1
an organic electroluminescent (EL) display (organic EL display apparatus) including organic EL elements
Data Source
AI summary
A method of manufacturing an organic EL display apparatus including an organic EL panel having light emitting pixels each of which has an organic EL element (OEL) includes: lighting up lighting target pixels set from among the light emitting pixels; causing an imaging device to photograph the organic EL panel and receiving a photographed image from the imaging device; detecting the lighting target pixels using the photographed image; determining whether an undetectable pixel that cannot be detected is included among the lighting target pixels, using a result obtained in the detecting; increasing an amount of luminescence of the undetectable pixel to a detectable amount of luminescence, when it is determined that the undetectable pixel is included; and aligning a relative position of the organic EL display apparatus and the imaging device, using the result obtained in the detecting.