On-Cell Touch Display Wiring Layout for Narrow Bezel Frames
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Solution Overview
Problem
Existing display devices employing on-cell type touch sensors face challenges in narrowing the frame due to the occupation of surrounding areas by mounting pads and wirings for external driving circuits.
Innovation Solution
The display device incorporates a novel configuration with first and second dams that have specific overlap and concave portions, allowing for efficient arrangement of mounting pads and wirings without occupying excessive space, thereby narrowing the frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If mounting pads and wirings for external driving circuits are arranged in the surrounding area, then the touch sensor can be driven, but the frame width increases
Solution Approach 1:
The patent transitions the arrangement of mounting pads and wirings from a two-dimensional planar layout to a three-dimensional vertical stacking configuration. Sensor wirings are positioned at different height levels (first wiring at first height, second wiring at second height), allowing electrical connections to be established vertically through the dam structure rather than horizontally in the plane, thereby reducing the horizontal space required in the surrounding area.
Solution Approach 2:
The patent implements a nested arrangement where mounting pads and wirings are integrated within the dam structure itself. The first and second wirings are embedded in the dam at different heights, with the dam serving as both a structural element and a wiring carrier. This nesting approach eliminates the need for separate wiring channels in the surrounding area, reducing frame width while maintaining driving capability.
2Area of stationary object
If the surrounding area is reduced to narrow the frame, then the frame width decreases, but it becomes difficult to arrange mounting pads and wirings
Solution Approach 1:
By utilizing the vertical dimension through multi-level wiring arrangement (first wiring at first height, second wiring at second height), the patent reduces the horizontal space requirement for wiring while maintaining all necessary electrical connections. This vertical integration simplifies the overall wiring layout by consolidating multiple wiring functions into a compact three-dimensional structure within the dam.
Solution Approach 2:
The dam structure is designed to serve multiple functions simultaneously: it acts as a structural boundary element, a mounting platform for pads, and a multi-level wiring carrier. By integrating these functions into a single unified structure, the patent reduces the need for separate components in the surrounding area, thereby narrowing the frame while managing wiring complexity through functional integration.
Data Source
AI summary
Provided is a display device including a first dam surrounding the display area, a second dam surrounding the first dam, a first sensor electrode and a second sensor electrode overlapping the display area, a first sensor wiring and a second sensor wiring over the first dam and electrically connected to the first sensor electrode and the second sensor electrode, respectively, a first wiring under the second dam and electrically connected to the first sensor wiring at a first contact portion, and a second wiring under the second dam and electrically connected to the second sensor wiring at a second contact portion.