Display Panel PCB Layout With Touch Sensor Notch for Thin Bezels
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Solution Overview
Problem
Existing display devices face challenges in minimizing the bezel area and thickness while integrating a printed circuit board effectively.
Innovation Solution
A display device design where the printed circuit board is directly disposed on the display panel, with a notch part extending from the display area to avoid overlapping pad areas, allowing for a reduced bezel and thinner thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the printed circuit board is disposed directly on the display panel, then the bezel area is reduced and thickness is minimized, but the integration with pad areas and touch sensor notch parts becomes more complex
Solution Approach 1:
The printed circuit board is divided into multiple parts (first part and second part) that are disposed at different locations on the display panel. The first part overlaps with the pad area while the second part is positioned elsewhere, allowing the PCB to be integrated directly onto the display panel without requiring a large continuous bezel area. This segmentation enables direct mounting while maintaining functional separation.
Solution Approach 2:
The patent utilizes the vertical dimension by disposing the printed circuit board directly on the display panel surface, overlapping with existing structures (pad areas, touch sensor regions) in the planar dimension. This three-dimensional integration approach eliminates the need for lateral expansion into bezel areas, achieving compactness through vertical stacking rather than horizontal placement.
2Length of stationary object
If the printed circuit board is disposed directly on the display panel, then the thickness is reduced, but the overlapping arrangement with pad areas and notch parts requires precise positioning
Solution Approach 1:
The notch parts are pre-formed in the touch sensor layer before the printed circuit board is disposed on the display panel. The pad areas are also predefined on the display panel. This preliminary preparation of recessed regions and contact areas ensures that when the PCB is mounted, the alignment and positioning are facilitated by these pre-established features, reducing the precision requirements during final assembly.
3Reliability
If the notch part extends from the display area to avoid overlapping pad areas, then the pad area integrity is maintained, but the touch sensor design becomes more complex
Solution Approach 1:
The touch sensor is segmented by introducing notch parts that create distinct regions. These notches partition the touch sensor structure into separate zones, allowing the pad areas to remain intact and isolated while the touch sensor functionality is distributed across multiple regions. This segmentation maintains electrical isolation of pads while preserving touch sensitivity in remaining areas.
Solution Approach 2:
The notch parts are strategically positioned to create local variations in the touch sensor structure only where needed to preserve pad area integrity. The touch sensor maintains its standard configuration in regions away from the notches, while the notched regions provide localized structural differentiation. This localized modification approach maintains overall touch sensor performance while solving the pad area overlapping issue.
Data Source
AI summary
A display device includes a display panel including a display area and one or more pad areas, a touch sensor disposed on the display panel and including a notch part, a polarizing layer disposed on the touch sensor and a printed circuit board disposed on the display panel and configured to overlap at least a part of the pad area, wherein the notch part is configured to extend in a first direction from the display area on a floor plan and to not overlap the pad area.