Display Panel Concentrating Units for Under-Screen Fingerprint Recognition
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Solution Overview
Problem
In display panels with integrated fingerprint recognition, high-intensity light emission from pixel points leads to premature aging, reducing the display's service life and affecting recognition performance due to light absorption and reflection issues.
Innovation Solution
Incorporating a concentrating structure with transparent film units having a graded refractive index between pixel points to enhance light reflection and collection, allowing for effective fingerprint recognition without the need for high-intensity light emission from these points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high-intensity light is emitted from pixel points to enable under-screen fingerprint recognition, then the light recognition unit can receive sufficient reflected light, but the pixel points age more quickly which reduces the service life of the display panel
Solution Approach 1:
A light concentrating structure is introduced as an intermediary component between the pixel points and the fingerprint recognition area. This structure includes a light concentrating layer with a first refractive index and a fingerprint recognition area with a second refractive index, where the first refractive index is greater than the second. The intermediary structure redirects and concentrates light from non-fingerprint pixel points toward the fingerprint recognition area, enabling sufficient light intensity for recognition without requiring pixel points to emit at high intensities that would cause aging.
2Measurement precision
If light is emitted from pixel points to irradiate the finger for fingerprint recognition, then fingerprint images can be acquired, but light is absorbed and reflected by functional film layers causing great depletion of reflected light that fails to reach required intensity
Solution Approach 1:
The light concentrating structure serves as an intermediary optical system that compensates for light depletion caused by functional film layers. By positioning the light concentrating layer between the pixel points and the fingerprint recognition area, and using the refractive index difference between layers, the system concentrates scattered and depleted light back toward the recognition area, ensuring sufficient reflected light intensity reaches the sensor for accurate fingerprint measurement.
Solution Approach 2:
The patent utilizes parameter changes in refractive index to control light propagation. The light concentrating layer has a higher refractive index than the fingerprint recognition area, creating optical conditions that bend and concentrate light paths. This parameter change enables the system to overcome light absorption and reflection losses by redirecting light that would otherwise be depleted by functional film layers.
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 effectively collects and enhances reflected light, improving fingerprint recognition sensitivity and extending the display panel's service life by reducing light loss and stress on pixel points.
Implementation Method 1
the concentrating units are transparent film with a graded refractive index
Implementation Method 2
which can collect light reflected by finger and entering the screen
Implementation Method 3
light should be emitted from pixel points of the display panel
Implementation Method 4
each functional film layer of the display panel absorbs and reflects light
Implementation Method 5
each functional film layer of the display panel absorbs and reflects light
Data Source
AI summary
A display panel and an electronic device. The display panel includes a substrate; a thin film transistor layer, the thin film transistor layer is located on the substrate; a light emitting layer, the light emitting layer is located on the thin film transistor layer, the light emitting layer includes a plurality of pixel points; the light emitting layer further includes a plurality of concentrating units, each of the concentrating units being located between two adjacent pixel points, and spaced apart from the pixel points.