Barrier Layer Protects Substrate in Optical Pattern Fingerprint Sensor
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Solution Overview
Problem
The challenge in display device manufacturing is to minimize damage to the substrate while integrating a fingerprint sensor layer, as existing methods do not effectively protect the substrate during the formation of optical patterns, leading to potential damage and reduced device durability.
Innovation Solution
A display device structure is proposed, featuring a barrier layer on the substrate, an optical pattern layer with light blocking and transmitting patterns, and a fingerprint sensor layer positioned underneath, with the barrier layer protecting the substrate during the formation of optical patterns, and the optical pattern layer guiding light for fingerprint recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fingerprint sensor layer is integrated into the display panel, then fingerprint recognition function is added, but the substrate may be damaged during the formation of optical patterns
Solution Approach 1:
A barrier layer is introduced as an intermediary component between the substrate and the optical pattern layer. This barrier layer serves as a protective mediator that prevents damage to the substrate during the formation of optical patterns while allowing the fingerprint sensor layer to function properly. The barrier layer acts as a buffer that absorbs mechanical stress and protects the substrate from damage during subsequent manufacturing processes.
2Device complexity
If optical patterns are formed directly on the substrate, then manufacturing process is simplified, but the substrate is exposed to damage during the process
Solution Approach 1:
The barrier layer is formed on the substrate before the optical pattern layer is deposited, providing beforehand protection against potential damage. This prior cushioning layer prevents harmful factors such as mechanical stress and chemical exposure during the optical pattern formation process, ensuring substrate integrity while maintaining a relatively simple manufacturing process.
3Reliability
If the barrier layer is added to protect the substrate, then substrate damage is reduced, but the device structure becomes more complex
Solution Approach 1:
The barrier layer is designed to perform multiple functions simultaneously: it protects the substrate from damage, serves as an adhesive interface between the substrate and optical pattern layer, and maintains optical transparency for fingerprint recognition. By consolidating multiple functions into a single layer, the overall device complexity is minimized while achieving comprehensive substrate protection.
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 configuration reduces substrate damage, enhances optical characteristics, and improves fingerprint recognition performance by protecting the substrate and allowing for precise light guidance for fingerprint sensing.
Implementation Method 1
a fingerprint sensor layer underneath the first substrate to receive light reflected from an external object
Data Source
AI summary
A display device includes: a first substrate; a barrier layer on the first substrate; an optical pattern layer on the barrier layer, and including a light blocking pattern, and a plurality of light transmitting patterns penetrating the light blocking pattern in a first direction; a first thin film transistor layer on the optical pattern layer; a light emitting element layer on the first thin film transistor layer; and a fingerprint sensor layer underneath the first substrate to receive light reflected from an external object.