On-Cell Touch Display Wiring Layout for Narrow-Bezel Frames
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Solution Overview
Problem
Existing display devices with 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, which affect the display area.
Innovation Solution
The display device incorporates a novel configuration with first and second dams that have specific overlaps and concave portions, allowing for efficient placement of mounting pads and wirings without obstructing the display area, thereby narrowing the frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If mounting pads and wirings for external driving circuits are placed in the surrounding area, then the touch sensor can be driven externally, but the frame width increases and display area decreases
Solution Approach 1:
The patent moves the driving circuit from the planar surrounding area to the vertical dimension by placing it in the overlap region between the first substrate and second substrate. The third substrate carrying the driving circuit is positioned in the space created by the overlapping arrangement of the first and second substrates, effectively utilizing the Z-axis dimension to resolve the space conflict.
Solution Approach 2:
The driving circuit is nested within the overlap region formed by the first and second substrates. The third substrate with the driving circuit is inserted into the space created by the overlapping arrangement, allowing the driving circuit to be housed within the existing structural envelope rather than requiring additional lateral space.
2Strength
If the second dam completely surrounds the first dam, then structural support is improved, but the available space for wirings and mounting pads increases
Solution Approach 1:
The second dam is designed with an asymmetric configuration featuring a concave portion that creates an overlap region. This asymmetric shape allows the second dam to provide structural support while simultaneously creating a dedicated space for the mounting pad and wiring connections, resolving the conflict between structural integrity and space utilization.
Solution Approach 2:
The second dam has different local properties: in most regions it provides continuous structural support, but in the overlap region it creates an opening or concave portion that allows access for wiring and mounting pad placement. This local variation in structure quality allows simultaneous achievement of structural support and wiring accessibility.
3Area of stationary object
If the frame is narrowed to increase display area, then the display area increases, but there is insufficient space for mounting pads and wirings
Solution Approach 1:
The wiring and mounting pad are placed in the vertical overlap region rather than in the lateral surrounding area. This dimensional shift allows the frame to be narrowed without compromising wiring placement capability, as the wiring space is created in the Z-axis direction rather than requiring lateral expansion.
Solution Approach 2:
The device is segmented into multiple substrates (first substrate for display, second substrate for touch sensor, third substrate for driving circuit) that are stacked and overlapped. This segmentation allows the wiring and mounting functions to be separated and placed in the overlap region, enabling frame narrowing while maintaining manufacturing capability.
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.