Organic EL Display Cathode Cable Segmentation for Narrow Frame
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Solution Overview
Problem
Organic EL display devices face challenges in achieving higher luminance and a narrower frame due to increased interconnection resistance in the cathode cable, which restricts current flow and affects image quality, especially with higher pixel resolution and complex circuit configurations.
Innovation Solution
Incorporating a pixel portion auxiliary cable electrically connected to the cathode cable in the frame portion, reducing interconnection resistance without enlarging the frame area, and allowing for a wider layout of the cathode cable, thereby maintaining luminance and achieving a narrower frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the cathode cable is laid out in the frame portion to surround the pixel array portion, then the current flow capacity is improved, but the frame width increases and the wiring region is reduced
Solution Approach 1:
The invention divides the cathode cable into two separate cables: a first cathode cable extending in the row direction and a second cathode cable extending in the column direction. This segmentation allows each cable to be optimized for its specific direction, reducing the overall frame width while maintaining sufficient current flow capacity in both directions.
Solution Approach 2:
The invention transitions from a single cathode cable layout to a two-dimensional cable arrangement by introducing cables in both row and column directions. This dimensional approach enables the cathode cables to efficiently cover the pixel array portion without requiring excessive frame width, as the current path is distributed across multiple dimensions.
2Measurement precision
If the pixel resolution is increased, then the display quality is improved, but the wiring region in the frame portion is reduced and interconnection resistance increases
Solution Approach 1:
By segmenting the cathode cable into first and second cathode cables extending in different directions, the invention reduces the length of each individual cable required to reach all pixels. This segmentation lowers the total interconnection resistance even as pixel resolution increases, maintaining reliable current delivery to each pixel.
3Area of stationary object
If the frame is narrowed, then the display device performance is improved, but the wiring region is insufficient and cathode cable interconnection resistance increases
Solution Approach 1:
The segmented cathode cable configuration allows the frame to be narrowed by distributing the wiring function across multiple shorter cables rather than requiring one long cable. This segmentation maintains adequate current flow capacity within the reduced frame width, preventing excessive interconnection resistance.
Solution Approach 2:
The invention uses a two-dimensional cable arrangement where first cathode cables extend in the row direction and second cathode cables extend in the column direction. This dimensional distribution enables the frame to be narrowed while still providing sufficient wiring region and low interconnection resistance through the multi-directional cable network.
Data Source
AI summary
A display device and electronic device are disclosed. In one example, a display device includes a pixel array portion including pixels arrayed in a matrix having a row direction and a column direction. The pixels each respectively including a light emission unit. A fixed potential line surrounds the pixel array portion in a frame portion outside the pixel array portion, and a pixel portion auxiliary cable is arranged to extend across the pixel array portion. The pixel portion auxiliary cable is interlayer connected to the fixed potential line at a location in the frame portion outside the pixel array portion.