Integrated Touch and Fingerprint Sensing in Display Devices
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Solution Overview
Problem
Conventional display devices require separate modules for fingerprint and touch sensing, which increases thickness and complexity, and do not efficiently integrate these functions within the display panel.
Innovation Solution
A display device with integrated touch sensing and fingerprint sensing capabilities, utilizing a configuration of write scan circuits, sensors, and switching elements that switch between sensing modes to perform both functions on the same panel, allowing for simultaneous image display and sensing operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If separate modules are used for fingerprint sensing and touch sensing, then sensing functions can be performed, but device thickness increases and integration is reduced
Solution Approach 1:
The patent merges fingerprint sensing and touch sensing functions into a single integrated sensing system. The sensing unit includes both fingerprint sensors and touch sensors that share common circuit resources (scan circuits, data circuits, and control logic), eliminating the need for separate modules and reducing overall device thickness while maintaining both sensing capabilities.
Solution Approach 2:
The sensing unit is designed with multi-functionality where the same sensor array and circuit infrastructure serve both fingerprint authentication and touch detection purposes. The control unit dynamically configures the sensing mode based on operational requirements, allowing the hardware to perform multiple functions without requiring dedicated separate modules for each function.
2Reliability
If separate modules are used for fingerprint sensing and touch sensing, then sensing functions can be performed, but device complexity increases
Solution Approach 1:
The patent combines multiple sensing functions into a unified sensing unit that shares common circuit infrastructure. The scan circuits, data circuits, and control logic are shared between fingerprint and touch sensing operations, reducing the total number of separate modules and simplifying the overall device architecture while maintaining reliable sensing performance through dedicated sensing elements for each function.
Data Source
AI summary
Disclosed is a display device including a plurality of touch sensing groups. Each of the plurality of touch sensing groups includes a plurality of write scan circuits, a plurality of pixels connected to the plurality of write scan circuits, a plurality of sensors connected to the plurality of write scan circuits, a plurality of first switching elements switching connections between the plurality of sensors and the plurality of write scan circuits, a touch sensing circuit connected to touch sensors connected one of the plurality of write scan circuits, and a second switching element switching a connection between the touch sensing circuit and the touch sensors.