Display Panel Trace Routing for Narrow Border AMOLED
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Solution Overview
Problem
The existing flexible active matrix organic light emitting diode (AMOLED) display panels with touch screens have wider lower borders due to the gathering of metal traces, which hinders the development of narrow border displays.
Innovation Solution
The display panel design includes a touch layer with intersecting and insulated electrode chains, a trace reserved area at the intersection of the first and second trace areas, and a flexible circuit board with a segmented lead area disposed at a tilt angle, allowing the first trace to connect directly to the flexible circuit board without passing through the second trace area, thereby reducing the border width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal traces of TX and RX are gathered at a binding of the lower border, then the connection between touch electrodes and flexible circuit board is achieved, but the width of the lower border increases
Solution Approach 1:
The patent divides the trace area into multiple independent regions: first trace area for TX connections, second trace area for RX connections, and trace reserved area for future expansions. This segmentation allows each trace to be routed independently through optimized paths, preventing the need for a wide gathering area at the lower border while maintaining reliable connections to the flexible circuit board.
2Reliability
If the trace area width is increased to accommodate all metal traces, then all touch electrodes can be connected, but the screen ratio decreases
Solution Approach 1:
The patent utilizes the vertical dimension by positioning the trace reserved area at an intersection region adjacent to the display area, and arranging the first lead area at a preset tilt angle. This three-dimensional spatial arrangement allows traces to connect efficiently without expanding the horizontal trace area width, thereby preserving the screen ratio while ensuring complete trace connections.
3Length of stationary object
If the first lead area is arranged at a preset tilt angle, then the first trace can connect directly to the flexible circuit board, but the layout complexity increases
Solution Approach 1:
The patent applies different arrangement strategies to different regions: the first lead area uses a preset tilt angle optimized for connecting to the flexible circuit board, while the second trace area maintains a standard horizontal arrangement. This localized optimization reduces the border width where needed without unnecessarily complicating the entire trace layout, as each region has its own optimized configuration.
Data Source
AI summary
A display panel includes a display area, a border area, a touch layer, and a touch trace. The border area includes a first trace area on opposite sides of the display area, a second trace area on another side of the display area, and a trace reserved area disposed inside an intersection of the first trace area and the second trace area. The touch layer includes a first electrode chain and a second electrode chain that are mutually intersected and insulated. The touch trace connecting the first electrode chain is arranged in the first trace area and the trace reserved area, and the second trace area only arranges the touch trace connecting the second electrode chain.