Fingerprint Identification Circuit Using Display Source Lines
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Solution Overview
Problem
Existing fingerprint identification technologies require additional fingerprint sensors, leading to complex manufacturing processes, higher costs, and thicker panels, making it difficult to produce fullscreen display panels with integrated fingerprint sensing capabilities.
Innovation Solution
A fingerprint identification circuit comprising a gate driving circuit, a source driving circuit, and a detection circuit that uses the existing source lines of a display panel to detect signal levels, eliminating the need for extra fingerprint sensors and simplifying control processes by leveraging the panel's gate and source lines to identify fingerprint veins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional fingerprint sensors are fabricated, then fingerprint identification capability is achieved, but manufacturing process complexity increases, cost increases, and panel thickness increases
Solution Approach 1:
The patent applies multi-functionality by enabling the existing source lines of the display panel to serve dual purposes: both as signal transmission lines for display operation and as sensing electrodes for fingerprint identification. This eliminates the need for separate dedicated fingerprint sensing electrodes, thereby reducing manufacturing complexity while maintaining fingerprint identification capability.
Solution Approach 2:
The patent merges the display electrode structure with the fingerprint sensing function by using the same source lines for both display signal transmission and fingerprint vein detection. This consolidation integrates two functions into a single structural component, reducing overall device complexity and eliminating additional manufacturing steps.
2Reliability
If additional fingerprint sensors are fabricated, then fingerprint identification capability is achieved, but manufacturing cost increases
Solution Approach 1:
The patent applies multi-functionality by enabling the existing source lines of the display panel to serve dual purposes: both as signal transmission lines for display operation and as sensing electrodes for fingerprint identification. This eliminates the need for separate dedicated fingerprint sensing electrodes, thereby reducing manufacturing complexity while maintaining fingerprint identification capability.
Solution Approach 2:
The patent applies self-service by utilizing the display panel's existing source lines to perform the fingerprint sensing function without requiring additional specialized components. The existing structure serves itself by being repurposed to detect fingerprint veins, thereby eliminating the need for extra sensors and reducing manufacturing costs.
3Reliability
If additional fingerprint sensors are fabricated, then fingerprint identification capability is achieved, but panel thickness increases
Solution Approach 1:
The patent merges the display electrode structure with the fingerprint sensing function by using the same source lines for both display signal transmission and fingerprint vein detection. This consolidation integrates two functions into a single structural component, reducing overall device complexity and eliminating additional manufacturing steps.
4Ease of operation
If time-divided control is used for touch sensors, then integrated chip control is simplified, but control complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring the source lines to have dual functionality before the device operates. The source lines are designed in advance to serve both display and fingerprint sensing purposes, eliminating the need for complex time-divided control mechanisms and reducing overall control complexity.
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 allows for fingerprint identification without additional sensors, reducing manufacturing complexity and costs, enabling fullscreen display panels with integrated fingerprint sensing capabilities.
Implementation Method 1
the capacitance between the source line and the finger changes according to the position of the finger on the panel
Data Source
AI summary
The present invention provides a fingerprint identification panel and the fingerprint identification circuit thereof, which comprise a gate driving circuit, a source driving circuit, and a detection circuit. The gate driving circuit is coupled to a plurality of gate lines, outputs a plurality of gate signals to the plurality of gate lines, and controls a state transition of the plurality of gate signals. The source driving circuit is coupled to a plurality of source lines. The detection circuit is coupled to the plurality of source lines or to a portion of the plurality of source lines. The detection circuit detects the levels of the plurality of signals on the coupled source lines when the state of the gate signal is changed and generates a plurality of detection signals.