Pixel Electrode Layer Structure for Low-Reflection OLED Displays
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Solution Overview
Problem
Flat panel display devices suffer from low visibility due to light reflection from external sources, which affects display quality, particularly in bright environments.
Innovation Solution
The display device incorporates a specific layer structure including a pixel electrode with central and outer portions, an insulating pattern, a pixel defining pattern, and an intermediate layer with an emission layer, which reduces external light reflection and enhances brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If color filters are disposed in an upper portion of the display device to reduce external light reflection, then visibility is improved, but device complexity increases
Solution Approach 1:
The patent transitions from placing color filters in the upper portion of the display device to positioning them at the lower portion, specifically on the lower electrode. This dimensional repositioning maintains the anti-reflection function while simplifying the overall structure by eliminating the need for separate upper portion filter layers and reducing manufacturing steps.
2Object-affected harmful factors
If a complex layer structure is used to reduce external light reflection, then display quality is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent combines the color filter function with the lower electrode structure, integrating multiple functions into a single component. The lower electrode simultaneously serves as an electrical component and a color filter carrier, reducing the number of separate layers and minimizing alignment precision requirements during manufacturing.
Solution Approach 2:
The lower electrode is designed to perform multiple functions: it provides electrical connectivity as an electrode and simultaneously serves as a substrate for color filters that reduce external light reflection. This multi-functionality reduces the overall number of components and simplifies the manufacturing process while maintaining display quality.
Data Source
AI summary
A display device includes a circuit element layer including a thin film transistor, a pixel electrode disposed on the circuit element layer, electrically connected to the thin film transistor, and including a central portion, an outer portion outside the central portion, and a first emission portion between the central portion and the outer portion, an insulating pattern disposed between the circuit element layer and the central portion of the pixel electrode, a pixel defining pattern disposed on the central portion of the pixel electrode, a pixel defining layer disposed on the circuit element layer and the pixel electrode, covering the outer portion of the pixel electrode, and exposing the first emission portion of the pixel electrode, an intermediate layer disposed on the pixel electrode, the pixel defining pattern, and the pixel defining layer and including an emission layer, and a common electrode disposed on the intermediate layer.