On-Cell Touch Panel Layout With Fewer Binding Pins
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Solution Overview
Problem
Display panels with flexible multi-layer on cell (FMLOC) structures require numerous pins for touch functionality, limiting the width of the lower frame and affecting design flexibility.
Innovation Solution
A display panel design that includes a base substrate with a touch function layer, first and second touch leads, and bridge lines to connect touch electrodes, reducing the number of binding pins while maintaining touch functionality and improving touch delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large number of binding pins are provided for touch function layer connection, then touch functionality is ensured, but the width of the lower frame increases
Solution Approach 1:
The patent transitions from horizontal pin arrangement to vertical lead arrangement by utilizing multiple conductive layers. Touch leads extend vertically through the display panel structure, allowing connection without increasing horizontal frame width. This dimensional reconfiguration enables maintaining touch functionality while reducing lower frame width.
Solution Approach 2:
The patent embeds multiple conductive layers within the display panel structure, nesting touch leads and bridge lines within the panel's internal layers. This nesting approach allows complex connections to be made within the existing frame boundaries without requiring additional external pins.
2Reliability
If multiple binding pins are used for touch electrode connection, then touch functionality is achieved, but device complexity increases
Solution Approach 1:
The patent merges multiple connection functions into a single binding pin by using bridge lines that connect multiple touch electrodes to one pin. Instead of requiring separate pins for each touch electrode, the bridge lines consolidate connections, reducing the total number of pins needed while maintaining full touch functionality.
Solution Approach 2:
The patent introduces bridge lines as intermediary conductive elements that mediate between touch electrodes and binding pins. These bridge lines serve as intermediate connection paths, allowing multiple electrodes to be connected to a single pin without direct pin-to-electrode connections for each electrode.
3Loss of time
If touch leads are extended through bridge lines, then touch delay is improved, but manufacturing complexity increases
Solution Approach 1:
The patent performs preliminary routing of touch leads through bridge lines during the manufacturing process, establishing optimized connection paths before final assembly. This preliminary arrangement of conductive paths minimizes signal transmission distance and potential interference, reducing touch delay while maintaining manufacturability through standardized multi-layer construction.
Data Source
AI summary
A display panel includes: a base substrate, a touch functional layer, a plurality of first binding pins, a plurality of first touch leads, and a plurality of second touch leads. The base substrate includes a display area and a first bezel area, the first bezel area being located on one side of the display area in a first direction. The first bezel area includes a binding area. The touch functional layer is located on one side of the base substrate, the touch functional layer including a plurality of first touch electrodes, and the orthographic projections of the first touch electrodes on the base substrate being located in the display area. The orthographic projections of the plurality of first binding pins on the base substrate are located in the binding area, the first binding pins being arranged corresponding to the first touch electrodes.