Under-Display Solid-State Imaging for IR Face Authentication
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Solution Overview
Problem
Existing face authentication technologies in mobile terminals face challenges in acquiring high-resolution two-dimensional images in dark environments, require multiple cameras, and necessitate design restrictions due to camera placement, while depth information acquisition often exceeds necessary resolution and requires camera holes in displays.
Innovation Solution
A solid-state imaging device with a light source emitting infrared light, dual-bandpass and bandpass filters, and separate light receiving regions for visible and infrared light, enabling simultaneous generation of infrared light and depth images for accurate authentication, even in dark conditions, without increasing camera count or requiring display holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a depth camera is used to acquire both distance image and two-dimensional image, then authentication function can be realized, but it requires high resolution depth camera which increases device complexity and cost
Solution Approach 1:
The patent divides the imaging function into two separate cameras: a first camera for capturing two-dimensional images and a second camera for capturing depth information. This segmentation allows each camera to be optimized for its specific function, avoiding the need for a single high-resolution depth camera that would increase complexity.
Solution Approach 2:
The patent combines the functions of two separate cameras (2D imaging and depth sensing) to achieve accurate authentication. By merging the data from both cameras through image fusion technology, the system achieves reliable authentication without requiring a single complex high-resolution depth camera.
2Reliability
If multiple cameras are used to acquire two-dimensional image and depth information, then authentication accuracy improves, but the number of cameras increases causing design restriction in mobile terminal
Solution Approach 1:
The system segments the imaging tasks between two specialized cameras: one for 2D visual information and another for depth measurement. This division allows accurate authentication while keeping each camera's requirements moderate, avoiding the need for a single high-performance depth camera that would impose stricter design constraints.
Solution Approach 2:
The first camera serves dual purposes by capturing both two-dimensional images for visual recognition and providing data for depth estimation through algorithms. This multi-functionality reduces the need for additional specialized components, easing design restrictions in mobile terminals.
3Ease of operation
If camera hole is made on display for face authentication, then authentication function is enabled, but display integrity is compromised and aesthetic appearance deteriorates
Solution Approach 1:
The patent merges the authentication imaging components with the existing display structure by placing cameras underneath the display panel. This integration allows the display to remain intact without holes or openings, maintaining both aesthetic appearance and structural integrity while enabling authentication functionality.
Solution Approach 2:
The imaging components are nested within the display structure, with cameras positioned beneath the display panel. This nesting approach allows the authentication system to be embedded within the existing display architecture, eliminating the need for separate camera openings and preserving display integrity.
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 solution allows for high-resolution infrared light and depth image acquisition, enhancing authentication accuracy and flexibility in mobile device design by integrating imaging and authentication functions under the display, enabling effective face recognition in various lighting conditions.
Implementation Method 1
a light source that is provided on an opposite side of a display surface of a display and emits light in an infrared light band via the display
Implementation Method 2
a first light receiving region that is provided on an opposite side of the display surface of the display and includes a pixel that receives light in a visible light band and a pixel that receives at least light in an infrared light band emitted from the light source
Implementation Method 3
The second light receiving region may include a bandpass filter having transmission characteristics in an infrared light band between the second light receiving region and the display surface of the display
Data Source
AI summary
Authentication accuracy is improved. A solid-state imaging device includes a light source, a first light receiving region, and a second light receiving region. The light source is provided on an opposite side of a display surface of a display, and emits light in an infrared light band via the display. The first light receiving region is provided on an opposite side of the display surface of the display, and includes a pixel that receives light in a visible light band and a pixel that receives at least light in an infrared light band emitted from the light source. The second light receiving region is provided on an opposite side of the display surface of the display, and includes a pixel that receives at least light in an infrared light band emitted from the light source.