Touch Conductive Layer Light-Transmission Openings for Fingerprint Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices face challenges in allowing light reflected from fingerprints to reach optical sensors due to electrode interference, which hinders effective fingerprint recognition.
Innovation Solution
The display device incorporates a substrate with pixels and optical sensors, featuring a touch conductive layer with light-transmission openings that overlap the bank and light-sensing transistors, ensuring light from fingerprints can pass through without being blocked by electrodes, and includes a light-blocking layer to manage light incidence effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If electrodes are included in the display device to enable touch functionality, then touch sensitivity is improved, but light transmission to optical sensors is blocked
Solution Approach 1:
The touch conductive layer is segmented into multiple regions: regions with touch electrodes for touch sensitivity and light-transmission openings for optical sensor access. This segmentation allows different parts of the same layer to serve different functions, resolving the contradiction between touch functionality and light transmission.
Solution Approach 2:
The touch conductive layer exhibits local quality variation: areas with touch electrodes provide touch sensitivity while areas with light-transmission openings provide light transmission. Each local region is optimized for its specific function, allowing both touch operation and fingerprint detection to coexist.
2Measurement precision
If light-transmission openings are created in the touch conductive layer to allow light to reach optical sensors, then fingerprint detection accuracy is improved, but touch electrode coverage is reduced
Solution Approach 1:
The touch conductive layer is divided into functional segments where light-transmission openings are strategically positioned to match optical sensor locations, while touch electrodes are placed in surrounding areas. This segmentation ensures both fingerprint detection accuracy and adequate touch electrode coverage are maintained.
Solution Approach 2:
The contradiction is resolved by considering the vertical dimension: the touch conductive layer is structured with light-transmission openings at specific positions that align with optical sensors below, while maintaining touch electrode coverage in other areas of the same layer, effectively using spatial arrangement to satisfy both requirements.
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 enables accurate fingerprint recognition by allowing light from fingerprints to reach optical sensors, enhancing the accuracy and reliability of fingerprint detection.
Implementation Method 1
a light-transmission opening disposed between the first emission area, the second emission area, and the touch electrodes, and the light-transmission opening overlaps the bank and the light-sensing transistor in a thickness direction of the substrate
Implementation Method 2
a plurality of optical sensors disposed on the substrate and including a light-sensing transistor including a first sensing channel configured to sense light
Implementation Method 3
a light-blocking layer disposed on the touch electrode and comprising a light-blocking layer opening through which light is incident
Data Source
AI summary
A display device is provided. A display device comprises a substrate, a plurality of pixels disposed on the substrate and having a first emission area and a second emission area configured to emit light, a plurality of optical sensors disposed on the substrate and comprising a light-sensing transistor having a first sensing channel configured to sense light, a bank disposed on the pixels and the optical sensors, and a touch conductive layer disposed on the bank and having touch electrodes, wherein the touch conductive layer comprises light transmitting portions disposed between the first emission area, the second emission area, and the touch electrodes, and the light transmitting portion overlaps the bank and the light-sensing transistor in a thickness direction of the substrate.