OLED Light Blocking Layer Connects Sensing Lines
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Solution Overview
Problem
The complexity of layout design in organic light emitting display devices increases due to the addition of sensing circuits, leading to high frequencies of static electricity shorts and line defects, resulting in poor image quality.
Innovation Solution
The implementation of a display panel design with vertically and horizontally positioned sensing lines, where the horizontal sensing line is formed from a source/drain metal layer and connected to sensing transistors through an insulated light blocking layer, reducing overlap and parasitic capacitance, and using a dummy semiconductor layer to increase interlayer thickness and prevent shorts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensing circuits are added to compensate for element characteristic changes, then the sensing capability is improved, but the layout design complexity increases
Solution Approach 1:
The light blocking layer is merged with the connection electrode function, creating a multi-functional structure that blocks light while establishing electrical connections between sensing lines and data lines, thereby reducing the number of separate components and simplifying layout design
Solution Approach 2:
The light blocking layer is designed to serve multiple functions: optical shielding and electrical connection, allowing a single structure to fulfill both roles and reducing overall circuit complexity
2Reliability
If the number of overlapping lines is increased due to sensing circuit addition, then the sensing function is achieved, but the occurrence of static electricity shorts and line defects increases
Solution Approach 1:
The light blocking layer acts as an intermediary structure between overlapping conductive lines, providing both optical shielding and controlled electrical connection through its conductive portion, thereby managing the interaction between lines and reducing harmful effects
Solution Approach 2:
The light blocking layer is designed as a composite structure with both insulating and conductive portions, allowing it to provide optical shielding while enabling selective electrical connections, thus managing signal transmission and reducing defects in overlapping regions
Data Source
AI summary
An organic light emitting display device has a display panel including a first subpixel, a second subpixel, a data line, and sensing lines. The sensing lines may include a vertical sensing line and a horizontal sensing line connected to the vertical sensing line. The horizontal sensing line may be formed of a source/drain metal layer present on the first substrate, and one portion thereof connected to a first electrode of a sensing transistor of the first subpixel and the other portion thereof connected to a first electrode of a sensing transistor of the second subpixel may be positioned in a region intersecting with the data line, and electrically connected by a connection electrode formed of an insulated light blocking layer below the source/drain metal layer present on the first substrate.