On-Display Fingerprint Sensor Integration in Light-Emitting Device Package
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Solution Overview
Problem
The thickness of display devices is increased due to the need for a separate substrate with a fingerprint sensor, which is not integrated with the light-emitting device, leading to space inefficiencies and potential performance limitations in fingerprint recognition.
Innovation Solution
A light-emitting device package is designed where the on-display fingerprint sensor and support substrate are integrated, eliminating the need for a separate fingerprint sensor substrate, with light-emitting structures and sensors arranged to overlap and share space, allowing for efficient light emission and reflection for fingerprint sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate substrate with fingerprint sensor is attached to the display panel, then fingerprint sensing function is provided, but the thickness of the display device is increased
Solution Approach 1:
The patent combines the fingerprint sensor substrate and the light-emitting device substrate into a single integrated substrate. The sensor unit and light-emitting unit are formed on the same substrate, eliminating the need for a separate fingerprint sensor substrate attachment, thus reducing the overall thickness of the display device while maintaining both display and fingerprint sensing functions
Solution Approach 2:
The substrate serves multiple functions simultaneously: it acts as both the support structure for the light-emitting device and the fingerprint sensor. The same substrate provides mechanical support, electrical connections, and structural integrity for both the display function and the biometric sensing function, achieving multi-functionality in a single component
2Adaptability or versatility
If a separate substrate with fingerprint sensor is attached to the display panel, then fingerprint sensing function is provided, but space efficiency is reduced
Solution Approach 1:
The patent merges the fingerprint sensor and light-emitting device into a single integrated unit on one substrate. This consolidation eliminates the need for additional separate substrate space, improving space efficiency by combining what were previously separate functional areas into a unified structure
3Length of moving object
If fingerprint sensor and light-emitting device are integrated on the same substrate, then thickness is reduced and space efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The integrated substrate is divided into distinct functional regions: a sensor unit region for fingerprint sensing and a light-emitting unit region for display. This segmentation allows each unit to be optimized and manufactured separately using specialized processes, then integrated together, reducing the overall manufacturing complexity compared to creating a fully monolithic structure
Solution Approach 2:
The patent introduces a reflection layer as an intermediary component between the sensor unit and the light-emitting unit. This reflection layer facilitates optical coupling and signal transmission between the two units, enabling their integration while managing the complexity of their interaction through a dedicated intermediary component
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 integration reduces the thickness of the display panel while enhancing fingerprint recognition performance by allowing the same number of sensors as light-emitting structures to be formed in a smaller area, improving resolution and functionality.
Implementation Method 1
an sensor including a photoelectric conversion region, the photoelectric conversion region being disposed in the substrate
Data Source
AI summary
A light-emitting device package is provided. The light-emitting device package includes: a substrate having a first surface and a second surface, and having a first opening and a second opening spaced apart from each other; a light-emitting structure disposed on the first surface of the substrate and vertically overlapping the first opening; and an image sensor including a photoelectric conversion region, the photoelectric conversion region being disposed in the substrate and vertically overlapping the second opening. Light from the light-emitting structure is emitted toward the second surface of the substrate through the first opening.