Touch Substrate Multiplexing Fingerprint Recognition Structures
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Solution Overview
Problem
Conventional fingerprint recognition modules in display devices require significant space, increase device thickness, reduce light transmittance, and have complex manufacturing processes, making them unsuitable for full-screen displays with limited space and high accuracy requirements.
Innovation Solution
A touch substrate with separate touch and fingerprint recognition regions, where fingerprint recognition units are integrated as touch units, allowing for multiplexing of structures to share components and reduce size, and a driver chip controls both touch and fingerprint recognition functions, enabling flexible design and improved manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate fingerprint recognition module is used, then fingerprint recognition function is achieved, but device thickness increases and light transmittance decreases
Solution Approach 1:
The patent merges the fingerprint recognition module with the touch substrate by integrating fingerprint recognition electrodes directly into the touch substrate structure. The fingerprint recognition electrodes are formed in the same layered structure as the touch electrodes, sharing common substrates, insulating layers, and conductive materials, thereby eliminating the need for a separate fingerprint recognition module and reducing overall device thickness.
Solution Approach 2:
The touch substrate is designed to serve multiple functions simultaneously: it acts as both the touch sensing substrate and the fingerprint recognition substrate. The same substrate, insulating layers, and electrode structures are utilized for both touch detection and fingerprint recognition, making the system multi-functional and eliminating redundant components that would increase thickness.
2Reliability
If a separate fingerprint recognition module is used, then fingerprint recognition function is achieved, but light transmittance decreases
Solution Approach 1:
The patent merges the fingerprint recognition module with the touch substrate by integrating fingerprint recognition electrodes directly into the touch substrate structure. The fingerprint recognition electrodes are formed in the same layered structure as the touch electrodes, sharing common substrates, insulating layers, and conductive materials, thereby eliminating the need for a separate fingerprint recognition module and reducing overall device thickness.
Solution Approach 2:
The patent employs thin film structures for the fingerprint recognition electrodes, using transparent conductive materials deposited as thin films on the substrate. This thin film approach minimizes the optical path and material density in the light path, thereby maximizing light transmittance while maintaining fingerprint recognition functionality.
3Reliability
If a separate fingerprint recognition module is used, then fingerprint recognition function is achieved, but manufacturing process becomes complex
Solution Approach 1:
The patent merges the fingerprint recognition module with the touch substrate by integrating fingerprint recognition electrodes directly into the touch substrate structure. The fingerprint recognition electrodes are formed in the same layered structure as the touch electrodes, sharing common substrates, insulating layers, and conductive materials, thereby eliminating the need for a separate fingerprint recognition module and reducing overall device thickness.
Solution Approach 2:
The patent incorporates the fingerprint recognition electrode structures during the initial formation of the touch substrate layers. The fingerprint recognition electrodes are formed simultaneously with or before the touch electrodes, using the same deposition and patterning processes, thereby eliminating subsequent separate manufacturing steps and simplifying the overall manufacturing process.
4Device complexity
If fingerprint recognition units are integrated as touch units with multiplexing, then structure size is reduced and manufacturing is simplified, but design flexibility may be limited
Solution Approach 1:
The patent implements a dynamic control system where the driver chip can selectively activate different electrode configurations based on the operational mode. The same physical electrode structure can be dynamically reconfigured between touch sensing mode and fingerprint recognition mode through different scanning patterns and signal sequences, providing design flexibility despite the integrated structure.
Solution Approach 2:
The patent utilizes parameter changes in the driving signals to achieve different functions from the same electrode structure. By changing the frequency, amplitude, or scanning pattern of the applied signals, the system can switch between touch detection and fingerprint recognition modes, maintaining design flexibility through signal parameter variation rather than structural changes.
Data Source
AI summary
A touch substrate and a display device are provided. The touch substrate includes: a substrate having a surface including a touch region and a fingerprint recognition region, the touch region and the fingerprint recognition region not overlapping with each other; and a plurality of touch units in the touch region and the fingerprint recognition region, respectively. Each of the touch units in the touch region includes a touch structure. Each of the touch units in the fingerprint recognition region includes a plurality of fingerprint recognition units. Each of the plurality of fingerprint recognition units includes a fingerprint recognition structure, and in a touch mode, each fingerprint recognition structure is multiplexed as a touch structure of each touch unit in the fingerprint recognition region.