Pixel Electrode Layout for OLED Brightness
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Solution Overview
Problem
Organic light-emitting display apparatuses face reduced brightness due to smaller sub-pixel sizes, which affect image precision and overall display quality.
Innovation Solution
The design includes adjacent pixel electrodes with a pixel-defining layer that covers parts of each electrode except the center and edges facing adjacent electrodes, allowing increased light emission areas without expanding the electrode size, and thin film transistors connected to these electrodes with an insulating layer covering the connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the size of sub-pixels is reduced to achieve high resolution, then the resolution is improved, but the brightness is reduced
Solution Approach 1:
The pixel-defining layer is divided into multiple regions with different coverage patterns: it covers the connecting portions of pixel electrodes to TFTs, covers three edges of each pixel electrode, but leaves the center portion and one edge (facing adjacent pixel electrode) exposed. This segmented coverage strategy maximizes the light emission area while maintaining proper electrical connections and pixel isolation, thereby improving brightness without sacrificing resolution
Solution Approach 2:
The patent optimizes the light emission area by strategically exposing specific portions (center and one edge) of the pixel electrode in the planar dimension, rather than increasing the overall pixel size. This dimensional optimization allows more light emission regions within the constrained sub-pixel area, addressing the brightness reduction issue while maintaining high resolution
2Reliability
If the pixel-defining layer covers the connecting portion of pixel electrode to TFT, then the electrical connection is protected, but the light emission area is reduced
Solution Approach 1:
The pixel-defining layer applies selective coverage: it covers the connecting portions of pixel electrodes to TFTs to ensure reliable electrical connections, while simultaneously leaving the center portion and the edge facing the adjacent pixel electrode uncovered to maximize light emission. This local differentiation resolves the contradiction by providing protection where needed and light emission where beneficial
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 enhances brightness and image precision by increasing the light emission area while maintaining the limited size of sub-pixel electrodes, improving the overall display quality and brightness of the organic light-emitting display apparatus.
Implementation Method 1
an organic light-emitting display apparatus displaying images by using light emitted from an emission layer disposed between a pixel electrode and an opposite electrode
Data Source
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AI summary
An organic light-emitting display apparatus includes a first pixel electrode (311) and a second pixel electrode (312) that are disposed spaced apart adjacent to each other; and a pixel-defining layer (219) disposed on the first pixel electrode (311) and the second pixel electrode (312), the pixel-defining layer (219) covering a part of the first pixel electrode (311) and a part of the second pixel (313) electrode except a center portion of the first pixel electrode (311), a center portion of the second pixel electrode (312), a first edge of the first pixel electrode (311) in a direction toward the second pixel electrode (312), and a second edge of the second pixel electrode (312) in a direction toward the first pixel electrode (311).