Display Device Fingerprint Area Light Path Control
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Solution Overview
Problem
Conventional display devices with integrated fingerprint recognition systems face challenges in maintaining the aesthetic appeal and functionality, particularly in preventing the fingerprint recognition area from being visible at various angles, while ensuring effective light management for both display and recognition purposes.
Innovation Solution
The implementation of a light shielding layer with an opening, a fingerprint sensor positioned within or overlapping this opening, and a light path control layer that includes viewing angle control patterns and light transmitting regions, which blocks external light at specific angles and allows reflected light from the display panel to reach the fingerprint sensor for recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light shielding layer with an opening is used to allow light transmission for fingerprint recognition, then the functionality of fingerprint recognition is improved, but the fingerprint recognition area becomes visible at various angles which deteriorates the aesthetic appearance
Solution Approach 1:
The light path control layer is divided into multiple viewing angle control patterns that segment the light transmission paths. Each pattern is positioned at specific angles to control light transmission directionally, allowing fingerprint recognition light to pass through while blocking external light from viewing angles that would reveal the fingerprint area.
Solution Approach 2:
The light path control layer introduces local quality variations through viewing angle control patterns with different orientations and positions. Each local region of the light path control layer has specific optical properties tailored to control light transmission from particular directions, enabling selective visibility control for the fingerprint recognition area.
2Shape
If a light path control layer with viewing angle control patterns is added to control light transmission angles, then the visibility control of the fingerprint recognition area is improved, but the device structure becomes more complex
Solution Approach 1:
The light path control layer is integrated directly onto the light shielding layer, merging multiple functions into a single structural component. This integration reduces the number of separate layers and simplifies the overall device structure while maintaining the visibility control functionality through the viewing angle control patterns.
Solution Approach 2:
The light path control layer serves multiple functions simultaneously: it acts as a structural layer, a light transmission controller, and a visibility management component. The viewing angle control patterns provide multi-directional light control in a single layer, reducing the need for additional specialized components.
3Shape
If the light path control layer blocks external light at specific angles, then the aesthetic appearance is improved by hiding the fingerprint area, but the light transmission for fingerprint sensor operation may be reduced
Solution Approach 1:
The viewing angle control patterns create dynamic light transmission characteristics that vary with viewing angle. The structure allows high light transmission for light incident from the fingerprint sensor direction while blocking light from external viewing angles, effectively adapting the optical properties based on the direction of light propagation.
Solution Approach 2:
The solution addresses the light transmission problem by introducing angular dimension control rather than simply blocking light in one direction. The viewing angle control patterns manipulate light transmission in the angular dimension, allowing sufficient intensity for fingerprint recognition while preventing visibility from lateral viewing angles.
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 effectively reduces the visibility of the fingerprint recognition area from different angles, enhancing the device's aesthetics while maintaining the functionality of fingerprint recognition and ensuring optimal light management for both display and recognition processes.
Implementation Method 1
A light path control layer is disposed between the light shielding layer and the display panel and overlaps the opening of the light shielding layer
Implementation Method 2
The light path control layer includes a plurality of viewing angle control patterns and a plurality of light transmitting regions disposed between each of the plurality of viewing angle control patterns
Implementation Method 3
A fingerprint sensor is disposed on the light path control layer, within the opening of the light shielding layer
Data Source
AI summary
A display device includes a light shielding layer having an opening. A fingerprint sensor is disposed within or overlapping the opening of the light shielding layer. A light path control layer is disposed on the fingerprint sensor and the light shielding layer. The light path control layer covers the opening of the light shielding layer. A display panel is disposed on the light path control layer and includes a plurality of display elements. A window panel is disposed on the display panel.