Biometric Display Panel with Integrated Photodetectors
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Solution Overview
Problem
Conventional liquid crystal display (LCD) monitors lack palmprint recognition functionality, limiting their biometric sensing capabilities.
Innovation Solution
A display panel with an array of pixel units, each comprising at least three subpixels, including a semiconductor photodetector for biometric information detection, and a specific driving method using scan lines and signal lines to apply control voltage and common voltage signals for biometric signal detection, integrated with touch electrodes for touch event detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional LCD structure is used, then manufacturing simplicity is maintained, but biometric recognition functionality is lacking
Solution Approach 1:
The patent merges the display function and biometric sensing function into a single integrated panel structure. The semiconductor photodetector is integrated within the pixel unit structure, combining image display capabilities with palmprint recognition functionality in one device, eliminating the need for separate biometric sensors
Solution Approach 2:
The display panel is designed to perform multiple functions: it can display images through the subpixels and simultaneously detect biometric information through the semiconductor photodetector. This multi-functional design allows the same device to serve both display and biometric recognition purposes
2Measurement precision
If semiconductor photodetector is added to each pixel unit, then biometric detection capability is improved, but device complexity increases
Solution Approach 1:
The semiconductor photodetector is merged with the existing pixel unit structure rather than being added as a completely separate component. The photodetector shares the same substrate and integration process with the display elements, reducing overall system complexity despite adding sensing functionality
Solution Approach 2:
The pixel unit is segmented into distinct functional regions: subpixels for image display and semiconductor photodetectors for biometric sensing. This segmentation allows each component to be optimized for its specific function while maintaining a manageable overall structure
3Ease of operation
If multiple scan lines and signal lines are added, then biometric signal detection is enabled, but wiring complexity increases
Solution Approach 1:
The scan lines are designed to serve dual purposes: they control both the subpixels for display and the semiconductor photodetectors for sensing. By using the same scan line infrastructure for both functions, the patent avoids creating entirely separate wiring systems, thereby reducing overall wiring 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
Enhances sensitivity and accuracy in detecting biometric signals, enabling both image display and biometric recognition functions with a simplified structure and improved functionality compared to conventional LCDs.
Implementation Method 1
each semiconductor photodetector comprises a second transistor; the second transistor being a phototransistor
Data Source
AI summary
The present application discloses a display panel having an array of a plurality of pixel units, each pixel unit including at least three subpixels for image display, at least some of the plurality of pixel units including a semiconductor photodetector for detecting biometric information; a plurality of first scan lines and a plurality of data lines, each first scan line being connected to a row of subpixels, each data line being connected to a column of subpixels; each subpixel including a first transistor for image display; a plurality of common voltage terminals, each common voltage terminal being connected to a semiconductor photodetector; a plurality of second scan lines, each second scan line being connected to a plurality of semiconductor photodetectors for providing a control voltage signal; each semiconductor photodetector having a second transistor; the second transistor being a phototransistor having a gate node connected to a corresponding second scan line for receiving the control voltage signal to turn on the second transistor, and a first node connected to a corresponding common voltage terminal; and a plurality of read lines, each read line being connected to each semiconductor photodetector in a column of pixel units.