Under-Display Fingerprint Sensing With Conductive Layer Hole Layout
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices face challenges in effectively integrating fingerprint sensors due to limitations in sensing performance, particularly in improving the ability to clearly sense external inputs.
Innovation Solution
A display device design incorporating a sub-pixel with a light emitting element, a photo-sensing pixel with a light-receiving element, and a touch sensor with a conductive layer that forms a hole area overlapping the light-receiving layer, enhancing sensing performance through a specific patterning of the conductive layer using a wet etching process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch sensor with conductive layer is integrated with photo-sensing pixel, then touch sensing function is added, but sensing performance of photo-sensing pixel deteriorates due to interference from conductive layer
Solution Approach 1:
The conductive layer is selectively removed to form a hole area directly over the light-receiving layer, extracting the interfering conductive material from the critical sensing region while maintaining the touch sensor's overall structure and functionality
Solution Approach 2:
The conductive layer is configured with different properties in different regions: it is present in areas for touch sensing but removed in the hole area to improve photo-sensing performance, achieving local optimization of both functions
2Measurement precision
If conductive layer is removed to form hole area, then sensing performance of photo-sensing pixel is improved, but touch sensing capability may be affected
Solution Approach 1:
The conductive layer is segmented into regions: it is removed in the hole area to improve photo-sensing while retained in surrounding areas to maintain touch sensing functionality, allowing both functions to coexist
Solution Approach 2:
The conductive layer structure is designed to serve dual purposes: where present, it enables touch sensing; where removed (hole area), it allows improved photo-sensing, making the overall structure multi-functional
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
The design improves the sensing capability of the display device, enabling clear detection of external inputs such as fingerprints, while maintaining the functionality of the display and touch sensor operations.
Implementation Method 1
a light-receiving element including a light-receiving layer configured to obtain a sensing signal corresponding to light emitted from the light emitting element
Implementation Method 2
the conductive layer may be patterned by a wet etching process
Data Source
AI summary
A display device includes: a sub-pixel on a substrate and including a light emitting element; a photo-sensing pixel on the substrate and including a light-receiving element including a light-receiving layer configured to obtain a sensing signal corresponding to light emitted from the light emitting element; a touch sensor configured to obtain information about a touch input and including a conductive layer, wherein the conductive layer includes a hole area overlapping the light-receiving layer in a plan view.