Full-Surface Fingerprint Sensing Display with Local Brightness Control
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Solution Overview
Problem
Electronic devices with fingerprint recognition are limited as the fingerprint recognition function is confined to a predetermined space on the display.
Innovation Solution
A display device capable of sensing fingerprints on its entire front surface, with the ability to increase the brightness of the display area corresponding to the sensing area, thereby enhancing fingerprint recognition performance and minimizing signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If fingerprint recognition is confined to a predetermined space on the display, then device complexity is reduced, but the sensing area is limited
Solution Approach 1:
The display device integrates fingerprint sensing functionality across the entire front surface, allowing the display panel to serve both as a visual output device and a widespread biometric sensor. This multi-functional approach enables fingerprint recognition at any location on the display without requiring separate dedicated sensing hardware.
Solution Approach 2:
The front surface of the display is divided into multiple sensing regions that can independently detect fingerprints. The control circuit can selectively activate specific segments based on where a fingerprint is detected, allowing localized processing rather than requiring the entire surface to be processed simultaneously.
2Measurement precision
If brightness of the display area is increased to improve fingerprint recognition, then measurement precision is improved, but energy consumption increases
Solution Approach 1:
The control circuit detects the presence of a fingerprint on the front surface before initiating full brightness activation. By preliminarily identifying fingerprint presence through initial sensing, the system can then selectively increase brightness only in the specific region where fingerprint recognition is needed, rather than illuminating the entire display.
Solution Approach 2:
The display brightness is adjusted locally rather than globally. When a fingerprint is detected in a specific region, only that local area increases in brightness to enhance recognition, while the rest of the display maintains normal or reduced brightness levels, thereby minimizing overall energy consumption.
3Area of stationary object
If fingerprint sensing is performed across the entire front surface, then sensing area is increased, but signal processing amount increases
Solution Approach 1:
The control circuit extracts and processes only the fingerprint signal from the specific region where a fingerprint is detected, rather than processing signals from the entire front surface simultaneously. This selective extraction reduces the volume of data requiring processing while maintaining comprehensive sensing coverage.
Solution Approach 2:
The system performs preliminary detection across the entire front surface to identify where a fingerprint is present, then focuses detailed processing only on that specific localized region. This two-stage approach allows comprehensive sensing coverage while minimizing the computational burden by processing only relevant data.
Data Source
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AI summary
A display device relating to a method of operating thereof includes: a display panel having a touch sensing unit to sense an external touch and a display unit including a plurality of pixels; a fingerprint sensing panel to sense a fingerprint disposed on one surface of the display unit, the fingerprint sensing panel having a plurality of fingerprint sensing pixels respectively connected to a plurality of fingerprint scan lines and a plurality of fingerprint sensing lines, and a fingerprint scan driving circuit to drive one or more fingerprint scan lines included in a sensing area; and a read-out circuit to output a selection signal for selecting a sensing area of the fingerprint sensing panel.