Touch Panel Metal Mesh Layer Separation for Optical Uniformity
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Solution Overview
Problem
The integration of fingerprint identification modules into OLED display devices leads to a higher density of fingerprint identification electrodes, which limits the arrangement of lead wires and affects optical uniformity around the fingerprint identification region.
Innovation Solution
A touch panel design that includes a first metal mesh layer with touch and fingerprint identification electrodes, a second metal mesh layer with fingerprint lead wires, and a dielectric layer with contact holes for electrical connections, allowing the fingerprint lead wires to be connected to the identification electrodes without being limited by the touch electrodes and improving optical uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the arrangement density of fingerprint identification electrodes is increased, then the fingerprint identification function is improved, but the arrangement of lead wires is limited and optical uniformity is affected
Solution Approach 1:
The patent introduces a second metal mesh layer positioned behind the first metal mesh layer, moving the lead wire arrangement to a different spatial dimension. This allows the lead wires to be routed through the second layer without interfering with the touch electrode arrangement in the first layer, thereby resolving the conflict between high-density fingerprint electrode arrangement and lead wire routing.
Solution Approach 2:
The patent divides the metal mesh structure into two separate layers: the first metal mesh layer containing both touch electrodes and fingerprint identification electrodes, and the second metal mesh layer containing only the lead wires. This segmentation allows independent optimization of electrode density and lead wire arrangement without mutual interference.
2Measurement precision
If the arrangement density of fingerprint identification electrodes is increased, then the fingerprint identification function is improved, but optical uniformity around the fingerprint identification region is affected
Solution Approach 1:
By relocating the lead wires to the second metal mesh layer behind the first layer, the patent eliminates the visual and optical interference that previously occurred when lead wires passed through the touch region. This dimensional separation ensures that the high-density fingerprint electrode arrangement does not compromise the optical uniformity of the display.
3Adaptability or versatility
If lead wires pass through the touch region to connect to the control chip, then the fingerprint identification function is achieved, but the arrangement of lead wires is limited
Solution Approach 1:
The patent segments the metal mesh structure into two functional layers: the first layer for touch and fingerprint identification electrodes, and the second layer for lead wires. This segmentation provides greater flexibility in routing lead wires to the control chip without being constrained by the touch electrode arrangement, simplifying the overall wiring design.
Solution Approach 2:
The patent moves the lead wire routing to a second spatial layer, allowing independent path planning for connections to the control chip. This dimensional freedom enables more adaptable and simpler lead wire arrangements compared to routing through the touch region.
Data Source
AI summary
A touch panel and a display apparatus. The touch panel has a touch region and a fingerprint identification region and includes a first metal mesh layer, a second metal mesh layer, and a dielectric layer. The first metal mesh layer includes a plurality of touch electrodes disposed in the touch region and a plurality of fingerprint identification electrodes disposed in the fingerprint identification region. The second metal mesh layer includes a plurality of fingerprint lead wires. Each of the plurality of fingerprint lead wires is electrically connected to corresponding one of the plurality of fingerprint identification electrodes. The dielectric layer is disposed between the first metal mesh layer and the second metal mesh layer. The dielectric layer is provided with a plurality of contact holes via which the identification lead wires are electrically connected to the fingerprint identification electrodes.