Under-screen Fingerprint Light Guide Plate Pixel Column Integration
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Solution Overview
Problem
Existing under-screen optical fingerprint identification solutions for OLED display panels face challenges with light intensity drop and require additional light sources, complicating the panel process and affecting imaging quality.
Innovation Solution
An under-screen fingerprint identification device with a light guiding plate and light emitting pixel columns integrated into the display panel, where the light emitting pixel columns form a light source for fingerprint identification, eliminating the need for an additional light source and enhancing manufacturing compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light-guide plate solution is used for under-screen fingerprint identification, then light diffusion to the finger is achieved, but light intensity drops sharply at the end away from the light source, affecting imaging effect
Solution Approach 1:
The light emitting element is divided into multiple light emitting pixel columns that are distributed across the display area. Each pixel column acts as an independent light source, segmenting the illumination function throughout the display region rather than relying on a single centralized light source, thereby maintaining uniform light intensity across the fingerprint sensing area.
Solution Approach 2:
The patent transitions from a traditional single-point light source to a two-dimensional array of light emitting pixel columns integrated within the display panel structure. This dimensional expansion allows light to be emitted from multiple locations simultaneously, eliminating the intensity gradient problem associated with single-source diffusion and enabling effective fingerprint imaging across the entire touch area.
2Illumination intensity
If a separate light source is added for under-screen fingerprint identification, then sufficient light intensity is achieved, but difficulty of the panel process increases
Solution Approach 1:
The light emitting elements are merged with the existing display panel structure, specifically integrating the light emitting pixel columns into the display area. This combination eliminates the need for separate additional light sources and reduces manufacturing complexity by utilizing the display panel's existing pixel structure for dual purposes: display and fingerprint illumination.
Solution Approach 2:
The display panel pixels serve dual functions: they act as both display elements and light sources for fingerprint identification. This multi-functionality eliminates the need for dedicated separate light sources, simplifying the manufacturing process while providing sufficient illumination intensity for effective fingerprint sensing across the entire display area.
3Area of stationary object
If under-screen fingerprint identification is implemented, then screen ratio increases, but light intensity distribution becomes uneven
Solution Approach 1:
The illumination function is segmented into multiple light emitting pixel columns distributed across the display area. This segmentation ensures that light is emitted from numerous locations throughout the screen, maintaining uniform light intensity distribution across the fingerprint sensing region while preserving the full-screen display area and high screen ratio.
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 solution maintains sufficient light intensity for effective fingerprint identification without additional light sources, ensuring compatibility with various display panels and maintaining imaging quality, thus improving the feasibility and adaptability of under-screen fingerprint identification.
Implementation Method 1
a light-guide plate solution is commonly used for under-screen fingerprint identification. Although this solution can realize light diffusion to the finger
Implementation Method 2
detection of the fingerprint using light transmittance ability of the OLED display panel and light of the display panel itself to illuminate the finger
Data Source
AI summary
Embodiments of the present disclosure provide an under-screen fingerprint identification device and a display device. The under-screen fingerprint identification device comprises a light guiding plate comprising a light guiding region, wherein the light guiding region is disposed in a display area of the display panel, and a light emitting element disposed under the light guiding region. Wherein the light emitting element comprises a plurality of light emitting pixel columns, the plurality of light emitting pixel columns form a light emitting pixel region as a light source for fingerprint identification, each of the plurality of light emitting pixel columns comprises a plurality of sensors.