In-Display Biometric Sensor Layout With Overlapped Light Emitters
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Solution Overview
Problem
There is a need for display devices to incorporate biometric sensors within the display screen, reducing the size of the frame while providing biometric authentication to prevent unauthorized access.
Innovation Solution
The integration of light emitting units and sensing units within the same region of the display device, with a sensor driving unit coupled to the sensing units and partially overlapping with the light emitting units, allows for a compact design that combines image displaying and sensing functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fingerprint sensor is provided separately from display screen, then biometric authentication capability is improved, but device area and non-display region size increase
Solution Approach 1:
The patent combines the fingerprint sensor with the display screen by integrating sensing units into the display region. The sensing units are positioned within the display area and overlap with light emitting units in the third dimension, allowing the fingerprint sensor to be merged with the display without requiring separate external space. This merging resolves the contradiction by maintaining biometric authentication capability while reducing the non-display region size.
Solution Approach 2:
The patent utilizes the third dimension (depth layer) to resolve the spatial conflict between display and sensor components. Light emitting units and sensing units are positioned at different vertical levels, allowing them to overlap in the planar view without interfering with each other. This dimensional transition enables the fingerprint sensor to be integrated within the display region, reducing the footprint of the non-display region while maintaining authentication functionality.
2Area of stationary object
If light emitting units and sensing units are disposed in same region with overlapping drivers, then display region and authentication region are improved, but signal interference and manufacturing complexity increase
Solution Approach 1:
The patent positions light emitting units and sensing units at different vertical levels (third dimension) while maintaining their overlapping projection in the planar view. This spatial arrangement allows both units to occupy the same region without direct physical interference, as they operate at separate depths. The circuit drivers are also arranged to overlap in the third dimension, enabling compact integration while managing signal routing through vertical separation.
3Length of stationary object
If light emitting units and sensing units are disposed in same region with overlapping drivers, then frame size is reduced, but signal interference between units increases
Solution Approach 1:
The patent employs vertical stacking of light emitting units and sensing units in the third dimension to minimize horizontal signal interference. By positioning these units at different depths, the design reduces the lateral distance between signal paths and allows for more compact frame dimensions. The overlapping arrangement in the planar view is resolved through vertical separation, enabling reduced frame size without proportionally increasing signal interference.
Solution Approach 2:
The patent introduces shielding structures and careful circuit routing as intermediary measures to manage signal interference between overlapping light emitting and sensing units. These intermediary elements act as barriers or isolators that prevent direct signal coupling between the units while allowing them to coexist in the same spatial region, thus enabling frame reduction without excessive interference.
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
This solution enables a compact display device design with reduced frame size, while maintaining effective biometric authentication capabilities, thus enhancing information security and privacy.
Implementation Method 1
a plurality of light emitting units, a plurality of sensing units, and a sensor driving unit. The plurality of light emitting units are disposed on a first substrate
Data Source
AI summary
An electronic device includes a plurality of light emitting units, a plurality of sensing units, and a sensor driving unit. The plurality of light emitting units are disposed on a first substrate. The plurality of sensing units correspond to the plurality of light emitting units, and the plurality of light emitting units and the plurality of sensing units are disposed in a same region. The sensor driving unit is coupled to at least a portion of the plurality of sensing units, and the plurality of light emitting units and the sensor driving unit are partially overlapped with each other.