Sensing Panel Biometric Trace Lines Bypass Bridge Electrodes
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Solution Overview
Problem
Existing display devices face challenges in integrating biometric sensors, such as fingerprint sensors, without compromising touch sensing performance and display luminance, as they require specific spatial arrangements that can interfere with the operation of both sensing and display functions.
Innovation Solution
A sensing panel is designed with a touch sensor and a biometric sensor, where the biometric sensing area is surrounded by the touch sensing area, and the biometric sensing pattern layers are disposed on different layers than the touch sensing pattern layers, with trace lines electrically connecting the biometric sensing pattern layers and bypassing bridge electrodes, allowing for simultaneous biometric and touch sensing operations without affecting luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If biometric sensing pattern layers are integrated into the display device, then biometric sensing capability is improved, but touch sensing performance and display luminance may be degraded due to spatial interference
Solution Approach 1:
The patent applies multi-layer stacking to separate touch sensing and biometric sensing functions in the vertical dimension. Touch sensing pattern layers and biometric sensing pattern layers are disposed on different layers, allowing both functions to operate simultaneously without spatial interference. This dimensional separation resolves the contradiction by enabling biometric sensing capability while preserving touch sensing performance.
Solution Approach 2:
The sensing panel is segmented into distinct functional regions: a touch sensing area with touch sensing pattern layers and a biometric sensing area with biometric sensing pattern layers. The biometric sensing area is surrounded by the touch sensing area, creating spatially separated functional zones that prevent interference between touch sensing and biometric sensing operations.
2Adaptability or versatility
If biometric sensing pattern layers are integrated into the display device, then biometric sensing capability is improved, but display luminance may be degraded due to additional layer structures
Solution Approach 1:
By placing biometric sensing pattern layers on separate layers from the display structure, the patent minimizes the impact on light transmission. The vertical stacking allows biometric sensing functionality to be added without increasing in-plane obstruction to light, thereby preserving display luminance while enabling biometric sensing.
3Ease of manufacture
If trace lines and bridge electrodes are disposed on the same layer, then manufacturing complexity is reduced, but signal interference may occur between biometric and touch sensing circuits
Solution Approach 1:
The patent utilizes vertical layer separation to electrically isolate trace lines and bridge electrodes. By disposing these conductive elements on different layers with insulating layers between them, the patent prevents signal interference between biometric and touch sensing circuits while maintaining ease of manufacture through a systematic multi-layer fabrication process.
4Adaptability or versatility
If biometric sensing area is surrounded by touch sensing area, then both sensing functions are enabled, but device complexity increases due to multiple sensing regions and layers
Solution Approach 1:
The sensing panel is divided into functionally segmented regions: an inner biometric sensing area surrounded by an outer touch sensing area. This segmentation allows dual sensing functionality while organizing complexity into distinct, manageable zones with clear functional boundaries, making the overall system design more systematic.
Solution Approach 2:
The patent manages structural complexity by organizing multiple sensing functions across vertical layers rather than spreading them horizontally. The multi-layer architecture consolidates the dual sensing system in the vertical dimension, reducing in-plane complexity while enabling both touch and biometric sensing functions.
Data Source
AI summary
A sensing panel includes a touch sensor that obtains information of a touch input in a sensing area, and a biometric sensor that obtains biometric information in a biometric sensing area. The touch sensor includes sensing pattern layers in the sensing area. The sensing pattern layers include cell electrodes and bridge electrodes electrically connecting the cell electrodes. The biometric sensor includes biometric sensing pattern layers in the biometric sensing area and trace lines electrically connected to the biometric sensing pattern layers. The trace lines and at least a portion of the bridge electrodes are disposed on a same layer. The trace lines bypass the bridge electrodes in a plan view.