Display Panel Pixel-Sensor Circuit for Biometric Recognition
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Solution Overview
Problem
Existing display devices lack efficient integration of biometric information recognition capabilities, particularly in sensing user inputs and biometric data through capacitive and optical methods.
Innovation Solution
Incorporating a display panel with both pixels and sensors, where each pixel includes an emission element and a pixel driving circuit, and each sensor includes a light sensing element and a sensor driving circuit, utilizing transistors and capacitors to control operations in response to scan signals for biometric information recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a display device integrates sensor elements and driving circuits into the display panel, then biometric information recognition capability is improved, but device complexity increases
Solution Approach 1:
The patent merges sensor elements with display pixels by integrating them into the same display panel structure. Each pixel includes both an emission element for display and a light sensing element for biometric sensing, allowing the display device to perform both display and biometric recognition functions without requiring separate sensor devices
Solution Approach 2:
The display panel is designed to serve multiple functions: it acts as both a display device showing visual information and a sensing device for biometric recognition. The pixel driving circuit and sensor driving circuit enable the same physical structure to perform both emission and light sensing operations, enhancing the device's versatility
2Measurement precision
If separate sensor devices are used for biometric recognition, then recognition accuracy is improved, but ease of operation deteriorates
Solution Approach 1:
By combining the sensor elements directly into the display panel, the patent eliminates the need for separate sensor devices, making the system more integrated and easier to operate while maintaining accurate biometric recognition capability through the integrated light sensing elements
3Ease of operation
If multiple scan signals are used to control pixel and sensor operations, then operational control is improved, but device complexity increases
Solution Approach 1:
The patent segments the control signals into distinct scan signals for different operations: a first scan signal for controlling the emission element operation and a second scan signal for controlling the light sensing element operation. This segmentation allows independent control of display and sensing functions while organizing the complexity into manageable signal categories
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
Enables seamless integration of biometric information recognition into display devices, allowing for accurate sensing of user inputs and biometric data, enhancing user interaction and security features.
Implementation Method 1
Each of the sensors may include a light sensing element and a sensor driving circuit connected to the light sensing element
Data Source
AI summary
A display device may include a pixel and a sensor. The pixel may include an emission element and a pixel driving circuit. The pixel driving circuit may receive a first scan signal and a second scan signal. The sensor may include a light sensing element and a sensor driving circuit. The sensor driving circuit may include a reset transistor, an amplifying transistor, and an output transistor. The reset transistor may receive a reset voltage and the first scan signal and be connected to a first sensing node. The amplifying transistor may receive a first driving voltage and be connected between the first sensing node and a second sensing node. The output transistor may receive the second scan signals and be connected between the second sensing node and a readout line.