OLED Touch Electrode Layout for Clearer Defect Inspection
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Solution Overview
Problem
Existing organic light emitting display devices face challenges in efficiently inspecting touch electrodes for defects, particularly in portable implementations with touch functions, where the integration of touch electrodes and organic light emitting layers can lead to complexities in defect detection.
Innovation Solution
The organic light emitting display device incorporates a substrate with pixel areas and a pixel separating area, featuring pixels with a pixel electrode, an opposite electrode, and an organic light emitting layer. Additionally, it includes spacers in the pixel separating area and a touch electrode unit with first and second touch electrodes arranged in specific directions, forming touch pattern unit blocks and spacer pattern unit blocks for improved defect inspection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If spacers are disposed in the pixel separating area to maintain device structure, then structural integrity is improved, but image distortion occurs during defect inspection
Solution Approach 1:
The display device is divided into distinct regions: pixel areas for light emission and pixel separating areas for structural support. Spacers are confined to the pixel separating areas, segmenting their functional role so they provide structural integrity without interfering with the pixel areas during inspection.
Solution Approach 2:
The harmful effect of spacers (image distortion during inspection) is extracted and isolated to specific regions. By placing spacers only in pixel separating areas and not in pixel areas, the distortion-causing elements are taken out from the inspection-relevant zones while maintaining structural support where needed.
2Manufacturing precision
If spacers are arranged in repetitive patterns corresponding to unit blocks, then manufacturing consistency is improved, but interference patterns during inspection may occur
Solution Approach 1:
Different regions have different spacer arrangements optimized for their specific functions. Pixel separating areas contain spacers arranged in patterns matching the pixel matrix for manufacturing consistency, while pixel areas remain free of spacers to avoid inspection interference. This local differentiation resolves the contradiction between manufacturing precision and inspection quality.
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 configuration enables effective defect inspection of touch electrodes by maintaining consistent spacer arrangements across touch pattern unit blocks, reducing interference and improving image clarity for defect detection, thus enhancing the reliability of the touch function in portable organic light emitting display devices.
Implementation Method 1
An OLED is a light emitting diode in which the emissive electroluminescent layer is a film of an organic compound that emits light in response to an electric current
Data Source
AI summary
An organic light emitting display device includes: a substrate including pixel areas and a pixel separating area; a plurality of pixels; a plurality of spacers in the pixel separating area and spaced apart from each other; and a touch electrode unit disposed over the plurality of pixels and spacers. The touch electrode unit includes first touch electrodes arranged in a first direction and second touch electrodes arranged in a second direction. The touch electrode unit includes a plurality of touch pattern unit blocks repeatedly arranged. Each touch pattern unit block includes portions of each of neighboring first touch electrodes and portions of each of neighboring second touch electrodes. The spacers of each touch pattern unit block corresponds to a plurality of spacer pattern unit blocks repeatedly arranged. Each spacer pattern unit includes at least one spacer and is smaller than the touch pattern unit block.