Control Circuit for Display Panel Fingerprint Sensing
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Solution Overview
Problem
Conventional fingerprint recognition systems require redundant operations and increased time consumption when waking up a device from off-screen mode, as they necessitate double-click gestures, complex touch and fingerprint sensing combinations, and significant power usage due to extensive communication between the control circuit and system processor.
Innovation Solution
A control circuit with integrated display, touch, and fingerprint sensing capabilities, allowing fingerprint sensing at any screen position, utilizing a sensor array and internal clock display to reduce communication with the system processor, enabling blind unlocking and minimizing power consumption by only illuminating the touch region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the system processor sends display data to show an icon indicating a designated position for fingerprint recognition, then the user can locate the fingerprint sensing area, but more power consumption is necessary to realize the display function
Solution Approach 1:
The display panel only activates and sends display data for the specific fingerprint recognition icon area rather than the entire screen, achieving partial display action that reduces power consumption while still providing the necessary guidance for fingerprint recognition
Solution Approach 2:
The control circuit pre-arranges the fingerprint recognition process by first displaying the icon at the designated position, then automatically guiding the user's finger to that position, eliminating the need for additional communication cycles and reducing overall power consumption
2Reliability
If the fingerprint control circuit communicates with the system processor for determination and comparison of fingerprint features, then accurate fingerprint recognition is achieved, but larger time consumption is necessary for the communications
Solution Approach 1:
The control circuit performs preliminary fingerprint sensing and data acquisition before system processor involvement, preparing the fingerprint data in advance and reducing the communication time required for final recognition and comparison
Solution Approach 2:
The fingerprint recognition process is segmented into distinct phases: initial fingerprint data acquisition by the control circuit, followed by systematic communication with the system processor for recognition, allowing parallel processing and reducing overall communication time
3Measurement precision
If the user has to move his/her finger to the designated position indicated by the system, then the fingerprint can be sensed at the correct location, but the additional action and time reduce the user experience
Solution Approach 1:
The control circuit acts as an intermediary that receives the user's finger touch at any position on the screen, automatically determines the touch location, and guides the fingerprint sensing process to the correct area, eliminating the need for the user to manually navigate to a designated position
Solution Approach 2:
The display panel is designed to accept fingerprint touches at any position across the entire screen surface, making the fingerprint recognition function universal and position-independent, thereby improving user convenience while maintaining sensing accuracy
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 simplifies the fingerprint sensing flow, reduces time consumption, and enhances user experience by allowing fingerprint recognition at any screen position without the need for complex gestures, while minimizing power usage by controlling light emission only at the touch area.
Implementation Method 1
the touch sensing circuit may detect a finger touch on the screen
Implementation Method 2
the fingerprint sensing circuit may perform fingerprint sensing on any position of the screen and receive fingerprint image signals
Data Source
AI summary
A control circuit configured to control a display panel includes a display driver circuit, a touch sensing circuit and a fingerprint sensing circuit. The touch sensing circuit, coupled to the display driver circuit and the fingerprint sensing circuit, is configured to detect a finger touch on the display panel, determine a position of the display panel on which the finger touch is detected, and send information associated with the position to the fingerprint sensing circuit. The fingerprint sensing circuit is configured to perform fingerprint sensing on at least one zone corresponding to the position and receive fingerprint image signals from the at least one zone correspondingly.