Array Substrate Power Supply Terminals for Display Brightness Uniformity
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Solution Overview
Problem
Display panels experience significant horizontal IR drops, leading to uneven brightness due to voltage drops along anode or cathode lines, which are more pronounced than vertical drops, affecting the uniformity of display brightness and potentially overloading driving chips.
Innovation Solution
The array substrate design includes multiple power supply input terminals connected to pixel columns, with fan-out structures in the non-display area to equalize resistances and ensure uniform power supply, reducing horizontal IR drops by providing a consistent power supply signal to each pixel column through one-to-one or multiple connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a single power supply input terminal is used for each pixel column, then the horizontal IR drop is reduced and brightness uniformity is improved, but the device complexity and number of input terminals increase
Solution Approach 1:
The display area is divided into multiple pixel columns, and the power supply input terminals are segmented to correspond with these pixel columns. Each power supply input terminal is responsible for providing power to a specific pixel column, thereby reducing the horizontal IR drop within each column and improving overall brightness uniformity across the display panel.
Solution Approach 2:
The patent transitions from a traditional row-based power supply configuration to a column-based configuration. By arranging pixel columns vertically and providing dedicated power supply terminals for each column, the solution addresses the horizontal IR drop issue by changing the dimensional approach to power distribution.
2Reliability
If multiple power supply input terminals are used to reduce horizontal IR drop, then the voltage distribution uniformity is improved, but the manufacturing complexity and terminal management difficulty increase
Solution Approach 1:
Each pixel column is provided with its own dedicated power supply input terminal, creating local quality in the power distribution system. This ensures that each column receives uniform voltage supply independently, improving overall voltage distribution uniformity while allowing for localized manufacturing and testing processes.
Data Source
AI summary
An array substrate has a display area and a non-display area including a first bonding region. The array substrate includes: a plurality of pixel columns disposed in the display area, each of the plurality of pixel columns including a plurality of light-emitting units that are arranged in a second direction, the second direction being perpendicular to a direction in which an edge of the display area proximate to the first bonding region extends; and at least three first power supply input terminals disposed in the first bonding region, each first power supply input terminal being connected to at least one pixel column of the plurality of pixel columns, so as to provide a first power supply signal to the at least one pixel column.