OLED Array Substrate Black Matrix Via Design
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Solution Overview
Problem
Active matrix OLED display devices face current deviation due to light emitted by OLEDs incident on thin film transistors (TFTs), affecting display quality.
Innovation Solution
An OLED array substrate is designed with a black matrix over TFTs, featuring vias that allow electrodes to be connected to TFTs while preventing light from reaching them, and a barrier separates adjacent electrodes to minimize light interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a black matrix is added over TFTs to block light, then light interference on TFTs is reduced, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The black matrix is segmented with vias that selectively expose TFT electrodes, dividing the black matrix into functional zones: light-blocking areas and light-permeable connection areas. This segmentation allows the black matrix to simultaneously block harmful light while enabling necessary electrical connections.
Solution Approach 2:
The via structures act as intermediaries between the black matrix and TFT electrodes, creating controlled light-permeable pathways through the light-blocking black matrix. This intermediary structure resolves the conflict between light blocking and electrical connection requirements.
2Reliability
If vias are created in the black matrix for electrode connection, then electrical connectivity is maintained, but light blocking effectiveness is reduced
Solution Approach 1:
The black matrix exhibits local quality variation: it is opaque in most areas to block light, but contains localized transparent via regions for electrical connection. This local quality differentiation allows simultaneous achievement of light blocking and electrical connectivity.
Solution Approach 2:
The black matrix provides partial light blocking rather than complete coverage, with selective via openings. This partial action approach maintains sufficient light blocking effectiveness while enabling necessary electrode connections through the via pathways.
3Object-affected harmful factors
If barriers are added to separate adjacent electrodes, then light interference between adjacent TFTs is reduced, but manufacturing complexity increases
Solution Approach 1:
The barrier structure is merged with the black matrix and via configuration to form an integrated light-blocking system. The barrier extends from the black matrix to separate adjacent electrodes, combining multiple light-blocking functions into a unified structure that simplifies manufacturing compared to separate components.
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 prevents light from affecting TFTs, reducing current deviation and enhancing the display effect of active matrix OLED devices.
Implementation Method 1
a black matrix disposed over each thin film transistor, the black matrix being provided with a via therein
Data Source
AI summary
An OLED array substrate and a manufacturing method thereof, and a display device provided with the OLED array substrate are disclosed. The OLED array substrate includes a plurality of thin film transistors (2) disposed on a base substrate (1), each thin film transistor (2) being provided with a black matrix (6) thereon, and the black matrix (6) being provided with a via (60); over the black matrix (6) being disposed from bottom to top a first electrode (41), a luminescent layer (43) and a second electrode (42). The first electrode (41) is connected with the thin film transistor (2) through the via (60), and the first electrode (41) disposed over adjacent thin film transistors (2) are separated from each other by a barrier (44). The black matrix can block light emitted by the OLED to prevent TFTs from being illuminated, thereby ensuring the display effect of an active matrix type OLED display device.