Display Module Bypass Wiring via Touch Panel Vias
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Solution Overview
Problem
In display modules, the need to bypass TFT wiring around non-display regions, such as camera holes or notches, reduces the effective display area due to additional space required for wiring, contradicting the trend of maximizing display regions.
Innovation Solution
A display module design where TFT wiring is formed within the display region and bypassing wiring is integrated into the touch panel, using vias to connect with the TFT wiring, allowing the touch panel to omit wiring in non-display areas and utilize transparent electrodes like ITO, silver nano, or carbon nanotubes for bypassing, reducing the non-display region size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bypassing wiring is added to maintain wiring continuity around non-display regions, then wiring continuity is maintained, but the non-display region size increases
Solution Approach 1:
The patent moves the bypassing wiring from the display panel layer to the touch panel layer, utilizing the third dimension (vertical stacking) to resolve the contradiction. The bypassing wiring is formed on the touch panel substrate above the display panel, allowing it to route around non-display regions without occupying additional horizontal space on the display panel itself.
Solution Approach 2:
The touch panel substrate serves multiple functions: it provides the touch sensing function and simultaneously serves as a platform for routing the bypassing wiring. This multi-functionality allows the same structural element to solve both touch functionality and wiring continuity issues without requiring separate dedicated bypassing structures.
2Reliability
If additional space is allocated for bypassing wiring, then wiring continuity is maintained, but the display area is reduced
Solution Approach 1:
By relocating the bypassing wiring to the touch panel layer (vertical dimension), the patent eliminates the need for horizontal space on the display panel that would otherwise be required for bypassing routes. This preserves the display area while maintaining wiring continuity through the use of via holes that connect the two layers.
Solution Approach 2:
The bypassing wiring structure is nested within the existing touch panel structure. The bypassing wiring is formed on the touch panel substrate, which already exists as part of the display module stack, thereby utilizing existing structural space rather than adding new horizontal space requirements.
3Area of moving object
If the non-display region is minimized, then the display area is maximized, but wiring continuity becomes difficult to maintain
Solution Approach 1:
The patent resolves the wiring continuity issue by transitioning to a three-dimensional wiring architecture. Via holes penetrate through the touch panel substrate to connect the TFT wiring on the display panel with the bypassing wiring on the touch panel layer, enabling continuous electrical connections without requiring large non-display regions.
Solution Approach 2:
The via holes act as intermediaries that connect the TFT wiring layer on the display panel with the bypassing wiring layer on the touch panel. These vertical conductive pathways enable electrical continuity between layers, allowing the bypassing wiring to maintain connections without occupying horizontal space on the display panel.
Data Source
AI summary
A display device comprises: a display panel including a display area in which TFT wiring is formed and a non-display area in which the TFT wiring is omitted; a touch panel including touch wiring and positioned on the front surface of the display panel; bypass wiring formed in a portion corresponding to the non-display area on the touch panel; and a via of which one end is connected to the end of the TFT wiring, and of which the other end is connected to the bypass wiring, the via being formed in the thickness direction on the display panel and the touch panel, wherein the size of the non-display area in which an optical device is disposed on a display unit can be reduced.