Full-Screen Fingerprint Recognition via Collimator and Organic Sensor Integration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional display devices face challenges with fingerprint recognition sensors being separate from the display screen, occupying space and limited to specific areas, and using costly silicon-based CMOS sensors, making full-screen fingerprint recognition difficult.
Innovation Solution
Integration of fingerprint recognition units onto a glass substrate within the display panel, combined with a collimator mechanism using light transmission ports in light shielding layers to improve recognition precision and allow full-screen fingerprint recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fingerprint recognition sensors are disposed below the display screen, then the recognition function is achieved, but the module thickness increases and space is occupied
Solution Approach 1:
The patent merges the fingerprint recognition module with the display panel by integrating the sensor layer into the display structure. The sensor layer is positioned between the color filter layer and the glass substrate, combining display and fingerprint recognition functions into a single integrated module, thereby reducing overall thickness and eliminating the need for separate fingerprint recognition modules.
2Reliability
If the fingerprint recognition sensors are disposed below the display screen, then the recognition function is achieved, but the recognition area is limited to a predetermined area
Solution Approach 1:
The patent implements full-screen fingerprint recognition by making the sensor layer cover the entire display area. The sensor layer is positioned between the color filter layer and the glass substrate, enabling fingerprint recognition across the whole screen rather than being limited to a predetermined area, thus achieving universal recognition capability.
3Measurement precision
If silicon-based CMOS sensors are employed for the sensor, then the recognition precision is improved, but the manufacturing cost increases and the manufacturing process becomes difficult
Solution Approach 1:
The patent changes the material parameter of the sensor from silicon-based CMOS to organic light-emitting material. This parameter change enables the sensor to be manufactured using existing organic light-emitting diode (OLED) manufacturing processes, significantly reducing manufacturing difficulty and cost while maintaining recognition precision through optimized organic sensor layer structure and composition.
4Ease of manufacture
If the fingerprint recognition units are integrated on the glass substrate, then the cost and module thickness are optimized, but light transmission interference may occur
Solution Approach 1:
The patent introduces a light shielding layer as an intermediary between the sensor layer and the glass substrate. This light shielding layer prevents interfering light from reaching the sensor while allowing the organic light-emitting sensor to function properly, thus resolving the light transmission interference issue without compromising the integration benefits.
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 integration optimizes cost and module thickness, enabling fingerprint recognition across the entire screen with improved precision by blocking interfering light and reducing mechanical interference.
Implementation Method 1
light transmission ports are defined in light shielding layers to constitute a collimator mechanism, thereby blocking large angle interfering light, realizing a high signal-to-noise ratio
Implementation Method 2
each of the fingerprint recognitions unit includes a first electrode layer, a hole transport layer, a photosensitive layer, an electron transport layer, a second electrode layer
Data Source
AI summary
A display panel and a display device are provided, and a technical field in displays is related. The display panel includes an array substrate, a liquid crystal layer, a color filter layer, a sensor layer, a glass substrate, and a collimator mechanism. The sensor layer includes a plurality of fingerprint recognition units. The collimator mechanism is disposed on a side of the sensor layer away from the color filter layer. The display device includes the display panel. Display function, touch function, and fingerprint recognition function are integrated into one, by manufacturing the fingerprint recognition units on the glass substrate on the display panel. The cost and the module thickness are further optimized. A fingerprint recognition area is realized as a full-screen area, and fingerprints can be recognized at any position on the screen.