Transparent Capacitor Layout for Higher-Aperture OLED Array Substrates
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Solution Overview
Problem
OLED panels with a bottom-emitting structure face challenges in achieving a high aperture ratio due to opaque metal materials in capacitor regions, leading to reduced light transmission and increased risk of undercut and film peeling.
Innovation Solution
The array substrate design includes a transparent capacitor region with a composite metal layer comprising a metal layer and a second transparent layer, positioned in contact holes, which increases the aperture ratio and reduces the risk of undercut and film peeling by maintaining the transparency of the capacitor region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If opaque metal materials are used in capacitor regions, then the capacitor structure is formed, but the aperture ratio is reduced and light transmission is blocked
Solution Approach 1:
The patent applies composite materials by combining a transparent conductive oxide layer (such as ITO, IZO, or IGZO) with a metal layer to form a composite transparent electrode. This composite structure maintains the electrical conductivity needed for capacitor function while allowing light transmission, thereby resolving the contradiction between capacitor structure stability and light transmission. The transparent conductive oxide provides both electrical conductivity and optical transparency, eliminating the need for opaque metal materials in the capacitor region.
2Reliability
If opaque metal materials are used in capacitor regions, then the capacitor structure is formed, but the aperture ratio is reduced
Solution Approach 1:
The patent uses composite transparent electrodes made of transparent conductive oxide and metal layers to replace opaque metal materials. This allows the capacitor region to maintain its structural stability and electrical function while becoming optically transparent, thereby increasing the effective aperture ratio of the OLED panel.
Solution Approach 2:
The patent changes the optical properties of the capacitor electrode from opaque to transparent by using transparent conductive oxide materials. This material transformation allows the capacitor region to be visually transparent, increasing the light-emitting aperture area without compromising the capacitor's functional integrity.
3Reliability
If conventional metal layers are used, then the capacitor region is formed, but undercut and film peeling risks increase
Solution Approach 1:
The patent employs a composite structure of transparent conductive oxide and metal layers where the transparent conductive oxide serves as an adhesion-promoting interface layer. This composite structure improves film adhesion and reduces the risk of undercut and peeling by providing a stable, conformal base that bonds well with both the underlying substrate and overlying layers, while maintaining the necessary electrical and optical properties for capacitor function.
Data Source
AI summary
A method of fabricating an array substrate is provided. The array substrate includes a display region and a non-display region. The array substrate further includes a substrate, a first transparent layer disposed on the substrate corresponding to the display region, an interlayer insulating layer disposed on the substrate, and a second transparent layer disposed on the interlayer insulating layer.