Display Circuit Layout for In-Panel Biometric Sensing
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Solution Overview
Problem
Existing display devices face challenges in reducing the area of the non-display region while incorporating biometric information recognition functions, which often require additional space for sensor drive circuits and readout lines.
Innovation Solution
The display device integrates pixel drive circuits and sensor drive circuits with optimized layouts, including data lines, first and second readout lines, and connecting lines, within the display region, minimizing the non-display area by alternating pixel and sensor arrangements and using efficient scan and readout signal management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sensor drive circuits and readout lines are added to the display device to enable biometric information recognition, then the biometric sensing capability is improved, but the non-display region area increases
Solution Approach 1:
The patent merges sensor drive circuits with pixel drive circuits by integrating them into the same circuit layer and using shared readout lines. The sensor drive circuits are positioned adjacent to pixel drive circuits, and both types of circuits utilize the same data lines and readout line infrastructure, thereby combining multiple functions into a unified circuit architecture that reduces overall space requirements.
Solution Approach 2:
The readout lines are designed to serve multiple functions: they can readout signals from both pixel drive circuits and sensor drive circuits. The circuit layer is configured to support both display operations and biometric sensing operations through the same physical infrastructure, making the system multi-functional and reducing the need for separate dedicated circuits for each function.
2Area of stationary object
If the non-display region area is reduced to enhance display area, then the display-to-body ratio is improved, but the space for sensor drive circuits and readout lines is reduced
Solution Approach 1:
The circuit layer is segmented into distinct regions: a first region containing pixel drive circuits and a second region containing sensor drive circuits. These segmented regions are positioned adjacent to each other within the display region, allowing for organized placement that minimizes interference and simplifies routing while maximizing the usable display area.
Solution Approach 2:
The patent utilizes the vertical dimension by stacking different circuit types (pixel drive circuits and sensor drive circuits) in different regions of the same layer, rather than spreading them out horizontally. This dimensional organization allows for compact layout and efficient space utilization, reducing the non-display region area while maintaining all necessary circuit functions.
3Area of stationary object
If pixel and sensor arrangements are optimized within the display region, then the non-display area is minimized, but the scan and readout signal management becomes more complex
Solution Approach 1:
The readout lines are designed as multi-functional components that can readout signals from both pixel drive circuits and sensor drive circuits. This universal design simplifies signal management by using a single infrastructure for multiple purposes, reducing the need for separate dedicated readout paths and minimizing the overall circuit complexity despite the optimized mixed arrangement of pixels and sensors.
Data Source
AI summary
A display device including: a base layer having a display region and a non-display region; a circuit layer on the base layer; and an element layer on the circuit layer, the element layer including light emitting elements and light receiving elements corresponding to the display region, wherein the circuit layer includes: pixel drive circuits connected to the light emitting elements; sensor drive circuits connected to the light receiving elements; data lines connected to the pixel drive circuits; first readout lines connected to a first group of sensor drive circuits among the sensor drive circuits; second readout lines spaced apart from the first readout lines in a first direction and connected to a second group of sensor drive circuits among the sensor drive circuits; and connecting lines electrically connected with the second readout lines, respectively, in the display region.