Pixel-Integrated Contact Sensor for Fingerprint Recognition
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Solution Overview
Problem
Conventional touchscreen devices require a separate fingerprint recognition sensor, increasing device volume and compromising display area, especially in flexible devices where space for additional components is limited.
Innovation Solution
Integrating a contact sensor within each display unit pixel, utilizing a transparent transistor and enlarged pixel electrodes to enhance image sensitivity and detect contact capacitance, allowing for fingerprint recognition without a separate sensor, thus improving spatial efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate fingerprint recognition sensor is installed, then fingerprint recognition function is achieved, but device volume increases
Solution Approach 1:
The patent merges the fingerprint recognition sensor with the display panel by integrating the sensor into the display unit pixels. The contact sensor is formed within the display structure, combining the display and fingerprint recognition functions into a single integrated component, thereby eliminating the need for a separate sensor and reducing device volume.
Solution Approach 2:
The display panel is designed to serve multiple functions: it acts as both the visual display and the fingerprint recognition sensor. Each display unit pixel can function as a contact sensor for fingerprint detection, making the display panel a multi-functional component that performs both display and biometric authentication tasks.
2Adaptability or versatility
If a separate fingerprint recognition sensor is installed, then fingerprint recognition function is achieved, but display area is compromised
Solution Approach 1:
The fingerprint recognition function is merged into the display structure itself, with contact sensors being formed within the display unit pixels. This integration ensures that the sensor occupies no separate space and does not reduce the display area, as the same physical space serves both display and sensing purposes.
Solution Approach 2:
The patent utilizes the vertical dimension by forming the contact sensor in the same planar space as the display pixel but at different operational layers. The sensor functionality is embedded within the pixel structure, allowing the display area to remain fully utilized while incorporating the sensing function without spatial compromise.
3Measurement precision
If transparent transistor is used, then image sensitivity is improved, but manufacturing complexity increases
Solution Approach 1:
The patent employs transparent transistors with specific parameter characteristics (such as transparent semiconductor materials like TCO or TNO) to achieve both transparency and sufficient electrical performance. By carefully selecting and optimizing the material properties and dimensional parameters of the transparent transistor, the design achieves image sensitivity while managing manufacturing complexity through standardized fabrication processes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables efficient fingerprint recognition within the display area, enhancing image sensitivity and maintaining the flexibility of portable devices without the need for additional space, thereby improving the integrated spatial efficiency of electronic devices.
Implementation Method 1
a pixel electrode forming a contact capacitance by contact with a contact means
Implementation Method 2
an amplifying transistor where a gate electrode is connected to the drain electrode of the reset transistor, and a source electrode is connected to a power input terminal
Data Source
AI summary
A display apparatus capable of image scanning is provided including a contact sensor arranged in each unit pixel. The contact sensor includes a pixel electrode forming a contact capacitance by contact with a contact means; a reset transistor where a drain electrode is connected to a node where the contact capacitance is formed, and each of a gate electrode and a source electrode is connected to a first scan line to which a selective signal is applied; an amplifying transistor where a gate electrode is connected to the drain electrode of the reset transistor; and a detecting transistor where a drain electrode is connected to the drain electrode of the amplifying transistor, a gate electrode is connected to a second scan line to which a selective signal is applied, and a source electrode is connected to a readout line detecting a current corresponding to the contact capacitance.