OLED Array Substrate Light Shielding for Pixel Dimension Accuracy
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Solution Overview
Problem
The manufacturing process of OLED displays faces issues with optical scattering during the exposure of photoresist, leading to pixel edge tails and affected dimensions, which impact the performance of the OLED display.
Innovation Solution
An array substrate design incorporating light shielding portions that absorb light sensitive to the photoresist, preventing scattered light from affecting the pixel defining process, and a method for manufacturing this substrate that includes forming light shielding and pixel defining portions to avoid tail formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If light shielding portions are added to block scattered light, then manufacturing precision of pixel dimensions is improved, but device complexity increases
Solution Approach 1:
The substrate is divided into functional regions: first regions for pixel formation, second regions for light shielding, and pixel defining portions. This segmentation allows the light shielding portions to be strategically placed only where needed to block scattered light during exposure, improving pixel dimension accuracy without unnecessarily complicating the entire substrate structure.
Solution Approach 2:
Light shielding portions are selectively positioned within the second regions adjacent to the first regions, rather than uniformly across the entire substrate. This local application of light shielding properties ensures that scattered light is blocked only in critical areas, maintaining manufacturing precision while minimizing added structural complexity.
2Manufacturing precision
If pixel defining portions are formed to cover light shielding portions, then manufacturing precision is improved, but the side surfaces of light shielding portions remain exposed causing potential contamination
Solution Approach 1:
The pixel defining portions are formed to cover the top surfaces of the light shielding portions before the actual pixel formation process. This preliminary protective action prevents contamination from reaching the light shielding portions during subsequent manufacturing steps, while the deliberate exposure of side surfaces allows for proper light scattering control during exposure.
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 blocks scattered light, ensuring accurate pixel dimensions and improved OLED display performance by preventing tail formation during the manufacturing process.
Implementation Method 1
The light shielding portion can absorb a light having a sensitive wavelength of the negative photoresist
Data Source
AI summary
The present disclosure relates to an array substrate and a method for manufacturing the same. The array substrate includes a substrate having first regions for forming pixels and second regions located between the first regions, light shielding portions located within portions of the second regions adjacent to the first regions on the substrate, and pixel defining portions located within the second regions. At least a side surface of the light shielding portion adjacent to the first region is not covered by the pixel defining portion.