Sub-Light Emitting Pixel Structure for Wide-Angle OLED Displays
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Solution Overview
Problem
Deposition defects in large-sized display apparatuses due to shadow mask deflection, making it difficult to apply thermal deposition processes effectively.
Innovation Solution
A method involving spray or coat liquid organic light emitting material using an inkjet device or nozzle coating device, forming a display apparatus with sub-light emitting portions spaced apart and higher than the main light emitting portions, replacing thermal deposition with banks to distinguish subpixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If thermal deposition using shadow mask is used, then manufacturing process is established, but deposition defects increase in large-sized display apparatus
Solution Approach 1:
The patent removes the shadow mask component entirely from the manufacturing process. Instead of using thermal deposition with a shadow mask, the invention employs a solution process where organic light-emitting materials are dissolved in solvents and deposited directly through printing or coating methods, eliminating the source of deflection and deposition defects in large-sized displays
Solution Approach 2:
The patent replaces the mechanical thermal deposition system with a chemical solution process. Organic light-emitting materials are dissolved in solvents and applied using printing or coating techniques, substituting the mechanical shadow mask alignment and deposition process with a chemical solution-based approach that avoids deflection issues
2Illumination intensity
If sub-light emitting portion is disposed higher than main light emitting portion, then viewing angle is improved, but device complexity increases
Solution Approach 1:
The patent introduces a vertical dimension (height difference) between the main light-emitting portion and the sub-light-emitting portion. By positioning the sub-light-emitting portion at a higher level, the structure creates additional light emission pathways at different angles, improving viewing angle without requiring complex lateral arrangements
Data Source
AI summary
A display apparatus is provided, which may improve a viewing angle. The display apparatus comprises a substrate provided with a plurality of subpixels, and a plurality of banks for distinguishing the plurality of subpixels on the substrate, wherein each of the plurality of subpixels includes a main light emitting portion provided between the plurality of banks, and a sub-light emitting portion spaced apart from the main light emitting portion and disposed to be higher than the main light emitting portion.