OLED Display Power Lines on Second Substrate
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Solution Overview
Problem
Large-sized organic light emitting display devices experience voltage drops due to increased resistance, leading to non-uniform display characteristics and potential discarding of products.
Innovation Solution
The solution involves forming signal transmission lines or power transfer lines on a second substrate instead of the first substrate, with a second metal layer being longer and electrically connected to the first substrate through open areas, reducing resistance and maintaining voltage consistency across the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If power lines are extended to cover large substrate areas, then voltage supply is achieved, but voltage drop and resistance increase causing non-uniform display characteristics
Solution Approach 1:
The power supply system is segmented into multiple independent power lines distributed across the substrate. Each power line serves a specific region, preventing voltage drop from affecting the entire panel. The segmentation allows each power line to maintain lower resistance by covering shorter distances while collectively powering the large substrate area.
Solution Approach 2:
Power lines are arranged in both horizontal and vertical directions across the substrate, creating a two-dimensional power distribution network. This dimensional approach reduces the path length for current flow in any direction, minimizing voltage drop while covering large substrate areas effectively.
2Reliability
If power lines are positioned on the first substrate, then electrical connection is achieved, but non-display area increases reducing manufacturing efficiency
Solution Approach 1:
Power lines are transferred from the first substrate to the second substrate through conductive connections at the edges. This spatial relocation moves the power distribution infrastructure to a different layer/dimension, eliminating the need for extensive non-display areas on the first substrate while maintaining reliable electrical connections.
Solution Approach 2:
Conductive connections at the substrate edges act as intermediaries, transferring power from the first substrate to the second substrate. These intermediary connection points enable power line relocation without compromising electrical connection reliability, while optimizing the use of display area on the first substrate.
3Area of stationary object
If substrate size is increased for large displays, then display area is improved, but resistance increases causing voltage drop
Solution Approach 1:
The large substrate is divided into multiple power supply zones with dedicated power lines for each zone. This segmentation prevents voltage drop from propagating across the entire large substrate, as each segmented power line serves a localized region with controlled resistance.
Solution Approach 2:
The power distribution system utilizes both substrates in a stacked configuration, creating a three-dimensional power network. Power lines on the second substrate complement those on the first substrate, providing additional current paths that reduce overall resistance and voltage drop across large display areas.
Data Source
Figure 1A~1B
Figure 1C
Figure 2A~2B
AI summary
Disclosed is an organic light emitting display device that includes a first substrate; at least one pixel formed on the first substrate; a first power line formed on the first substrate, the first power line supplying a first voltage to the pixel; a second power line formed on the first substrate, the second power line supplying a second voltage to the pixel, the second voltage being different from the first voltage; and a second substrate formed over the first substrate, the second substrate including a first metal layer, a second metal layer, and an insulating layer formed between the first metal layer and the second metal layer, the insulating layer insulating the first metal layer and the second metal layer from each other, wherein the first metal layer is electrically connected with the first power line and the second metal layer is electrically connected to the second power line.