LCD Fingerprint Sensing Layout With Transparent Optical Sensor Layer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current liquid crystal display devices cannot perform under-screen fingerprint identification due to poor light imaging from backlight modules, which are inadequate for fingerprint identification purposes, resulting in a poor user experience.
Innovation Solution
A display device with a transparent optical sensor layer between the backlight module and the display panel, and a light-emitting diode as a first light source positioned under the cover plate, allowing for full-screen fingerprint identification without consuming emission light, enabling rapid and accurate fingerprint recognition without affecting the backlight module's structure or brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If backlight modules are used to provide light for fingerprint identification, then the display device can maintain its backlight function, but the imaging quality is poor and cannot meet fingerprint identification requirements
Solution Approach 1:
The patent divides the light source function into two separate systems: the backlight module for display illumination and the first light source for fingerprint identification. This segmentation allows each light source to be optimized for its specific function, with the first light source providing high-quality illumination for fingerprint sensing while the backlight module maintains display functionality.
Solution Approach 2:
The patent introduces a transparent optical sensor layer as an intermediary component between the backlight module and the display panel. This layer allows light from the first light source to pass through to illuminate the fingerprint sensor while maintaining the backlight function, effectively mediating between the two competing requirements.
2Device complexity
If fingerprint identification modules are disposed under the backlight modules, then the structure is simplified, but under-screen fingerprint identification cannot be realized and user experience deteriorates
Solution Approach 1:
The patent transitions the fingerprint identification function from a lateral arrangement (side-mounted sensors) to a vertical arrangement (under-screen placement). By positioning the transparent optical sensor layer between the backlight module and display panel, the system achieves under-screen fingerprint identification, allowing users to place their fingers directly on the display surface for more intuitive and convenient operation.
3Adaptability or versatility
If a transparent optical sensor layer is disposed between the backlight module and the display panel, then full-screen fingerprint identification is enabled, but the device structure becomes more complex
Solution Approach 1:
The transparent optical sensor layer serves multiple functions simultaneously: it acts as a light guide for the first light source, provides a transmission medium for optical signals during fingerprint identification, and maintains the structural integrity of the display assembly. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in overall device complexity.
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
Enables full-screen fingerprint identification rapidly and accurately without affecting the backlight module's structure or brightness, addressing the inability of current display devices to perform under-screen fingerprint identification with simple processes.
Implementation Method 1
a transparent optical sensor layer is disposed between the backlight module and the display panel. One side of the cover plate facing the display panel is provided with a first light source
Implementation Method 2
the transparent optical sensor layer receives reflected light of the emission light reflected by a touch body and transmits a sensing signal to the control module to perform the fingerprint image recognition
Data Source
AI summary
A display device and a fingerprint identification method thereof are disclosed. The display device includes a backlight module, a display panel disposed on the backlight module, and a cover plate disposed on the display panel. Wherein, a transparent optical sensor layer is disposed between the backlight module and the display panel, and one side of the cover plate facing the display panel is provided with a first light source.