Under-screen Fingerprint LCD Module with Reflective Layer
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Solution Overview
Problem
The challenge is to implement under-screen fingerprint identification on LCD screens in smart terminals, which require large battery capacities, ultra-thin bodies, and large display screens, while maintaining cost-effectiveness and avoiding excessive thickness, as OLED screens are costly and LCD screens dominate the market.
Innovation Solution
A display screen module with a backlight module, an LCD screen, a light-transmissible cover plate, a first light source integrated within the backlight module, a reflective component between the backlight module and the cover plate, and a light receiving module to face the reflective component, allowing for fingerprint identification without additional space or thickness increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If OLED screen is used to achieve under-screen fingerprint identification, then fingerprint identification function is realized, but manufacturing cost increases significantly
Solution Approach 1:
The patent replaces expensive OLED screens with standard LCD screens that have shorter operational lifetimes but are significantly cheaper and more widely available, enabling cost-effective under-screen fingerprint identification without requiring specialized display technology
Solution Approach 2:
The patent modifies the optical parameters of the LCD screen by introducing a reflective layer with specific reflectivity characteristics and adjusting the light source wavelength to match the fingerprint sensor's detection range, enabling fingerprint identification functionality on conventional LCD displays
2Reliability
If additional components are added for under-screen fingerprint identification, then fingerprint identification function is achieved, but display module thickness increases
Solution Approach 1:
The patent combines the fingerprint identification components (light source, reflective layer, sensor) with the existing display module structure, integrating them into the same space without requiring separate dedicated layers, thereby achieving ultra-thin profile while maintaining functionality
Solution Approach 2:
The patent nests the fingerprint identification system within the display module by placing the reflective layer between the LCD screen and backlight module, and positioning the light source and sensor within the existing structural boundaries, creating a compact nested configuration
3Reliability
If additional components are added for under-screen fingerprint identification, then fingerprint identification function is achieved, but device structure becomes more complex
Solution Approach 1:
The patent designs the display module components to serve multiple functions: the backlight module serves both display illumination and fingerprint identification lighting, the reflective layer serves both light reflection for display and light routing for fingerprint sensing, reducing overall system complexity
Solution Approach 2:
The patent enables components to perform their own additional functions without requiring separate dedicated components - the existing LCD screen structure serves the fingerprint identification function through the added reflective layer, eliminating the need for complex separate fingerprint sensor modules
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 under-screen fingerprint identification on LCD screens without increasing the thickness of the display module, meeting user requirements for large battery capacities, ultra-thin bodies, and large display screens, while maintaining cost-effectiveness.
Implementation Method 1
a first light source arranged in a backlight source of the backlight module and independent from the backlight source, and configured to emit a first light
Implementation Method 2
a reflective component arranged between the backlight module and the cover plate... configured to reflect the first light to form a second light
Implementation Method 3
a light receiving module arranged to face the reflective component and configured to receive light reflected by the reflective component
Data Source
Figure 1~1A
Figure 1B~1C
Figure 1D~1E
AI summary
A display screen module and a terminal. The display screen module comprises: a backlight module, an LCD screen arranged above the backlight module, a light-transmissible cover plate arranged above the LCD screen, a first light source arranged in a backlight light source of the backlight module, a reflective component arranged between the LCD screen and the cover plate, and a light-receiving module for receiving light reflected by the reflective component so as to carry out fingerprint recognition.