Display Sensor Circuit Layout for Co-Planar Biometric Sensing
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Solution Overview
Problem
Existing display devices face challenges in achieving improved sensing performance for biometric information recognition, particularly in integrating biometric sensors effectively with display functionalities.
Innovation Solution
A display device design that incorporates scan lines and sensing control lines on the same layer, with specific transistor configurations and light sensing units, enabling enhanced biometric information recognition through optimized sensor drive circuits and pixel drive circuits, utilizing oxide semiconductors for certain transistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If biometric sensors are integrated into the display device, then biometric information recognition capability is improved, but device complexity increases
Solution Approach 1:
The patent combines biometric sensing functionality with the display device structure by integrating sensors, scan lines, and pixel circuits into a unified system. The sensing control lines are merged with the scan line structure, and the sensor drive circuits are integrated with the pixel drive circuits, allowing biometric recognition without adding separate independent systems.
Solution Approach 2:
The display device is designed to perform multiple functions: display output and biometric information recognition. The same physical structure (substrate, conductive lines, transistors) serves dual purposes - driving display pixels and controlling sensor operations, making the device versatile without proportionally increasing complexity.
2Ease of manufacture
If scan lines and sensing control lines are placed on the same layer, then manufacturing process is simplified, but signal interference may increase
Solution Approach 1:
The conductive lines are segmented into different functional types (scan lines for display, sensing control lines for biometric sensing) that operate on the same physical layer but are electrically independent. This segmentation allows simplified manufacturing while maintaining signal integrity through proper circuit isolation.
Solution Approach 2:
The patent introduces sensing control lines as intermediary elements that mediate between the main scan lines and the sensor circuits. These intermediary lines carry sensing control signals separately, preventing direct interference between display scanning signals and sensor control signals while maintaining co-planar integration.
3Measurement precision
If oxide semiconductors are used for certain transistors, then sensing performance is improved, but manufacturing complexity increases
Solution Approach 1:
Oxide semiconductor transistors are used selectively in specific locations where high sensing performance is critical (sensor drive circuits and light sensing units), while other parts of the display device may use different transistor technologies. This localized application improves sensing performance without requiring the entire device to use complex oxide semiconductor manufacturing.
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 design enhances biometric sensing performance by improving the integration and efficiency of biometric information recognition, allowing for more effective biometric data capture and display integration.
Implementation Method 1
Each of the sensors may include a light sensing unit and a sensor drive circuit that is on the base layer and electrically connected with the light sensing unit
Data Source
AI summary
A display device includes: a base layer; a plurality of scan lines configured to sequentially receive scan signals, the plurality of scan lines being on the base layer; a plurality of pixels on the base layer and connected to each of the plurality of scan lines; a plurality of sensing control lines configured to simultaneously receive sensing control signals, the sensing control lines being on the base layer; and a plurality of sensors on the base layer and connected to respective ones of the sensing control lines, wherein the scan line and the sensing control line are on the same layer.