Dual-Sensor Display Architecture for Reliable Biometric Sensing
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Solution Overview
Problem
Display devices face challenges in maintaining reliable sensing capabilities, particularly in biometric information and illuminance sensing, due to interference and inefficiencies in electrostatic capacitive, optical, and ultrasonic wave sensing methods.
Innovation Solution
The display device incorporates a dual-sensor system with separate first and second sensors, each with distinct driving circuits and sensing elements, and utilizes different reset voltages to enhance sensing reliability, along with an anti-reflection layer to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single sensor is used for both biometric information and illuminance sensing, then device complexity is reduced, but sensing reliability deteriorates due to interference between different sensing functions
Solution Approach 1:
The sensor is divided into two independent sensing elements: a first sensing element for biometric information sensing and a second sensing element for illuminance sensing. Each sensing element has its own sensor driving circuit, allowing independent operation and eliminating interference between different sensing functions while maintaining separate functionality within a single sensor structure.
2Ease of manufacture
If electrostatic capacitive sensing method is used, then manufacturing simplicity is improved, but sensing precision deteriorates due to interference and inefficiencies
Solution Approach 1:
The patent applies different reset voltages to the first and second sensing elements through their respective sensor driving circuits. By changing the electrical parameters (reset voltages) of the sensing elements, the patent optimizes the sensing precision for each specific sensing function while maintaining the simplicity of the electrostatic capacitive sensing method.
3Reliability
If separate sensor driving circuits are provided for each sensing element, then sensing reliability is improved through reduced interference, but device complexity increases
Solution Approach 1:
The first sensor driving circuit and second sensor driving circuit are integrated within a single sensor structure, sharing common components and infrastructure while maintaining separate signal processing paths for each sensing element. This merging approach reduces overall device complexity compared to using completely separate sensors, while still providing the isolation needed for reliable sensing.
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
The dual-sensor system improves sensing reliability by reducing interference and enhancing the accuracy of biometric and illuminance detection, ensuring consistent and precise user input recognition.
Implementation Method 1
an electrostatic capacitive manner for sensing a change in electrostatic capacitance provided between electrodes
Implementation Method 2
an optical manner for sensing incident light using an optical sensor
Implementation Method 3
an ultrasonic wave manner for sensing vibration using a piezoelectric body
Data Source
AI summary
A display device includes a display panel including a display area defined therein. The display panel includes a pixel including a pixel driving circuit and a light-emitting element and a first sensor including a first sensor driving circuit and a first sensing element, where the first sensing element includes a first electrode electrically connected to the first sensor driving circuit, a semiconductor layer electrically disconnected from the first electrode, and a second electrode electrically connected to the semiconductor layer, and the light-emitting element is electrically connected to the pixel driving circuit and the second electrode.