Display Panel Optical Structure for Low-Reflectivity Fingerprint Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display panels with under-screen fingerprint identification technology face high screen reflectivity issues, which affect display quality and hinder mass production due to the need for high transmittance exceeding 2.5%.
Innovation Solution
A display panel design incorporating a color film layer and light-shielding layer with specific openings and filter elements, along with a photosensitive sensor, allows for fingerprint identification through pinhole imaging while reducing reflectivity by using filter elements and light absorption layers to minimize the total area of openings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmittance is increased to meet mass production requirements (greater than 2.5%), then the fingerprint identification function is achieved, but the screen reflectivity increases and display effect is influenced
Solution Approach 1:
The patent applies local quality by differentiating the optical properties of different regions within the display panel. Specifically, the fingerprint sensing region has higher transmittance (greater than 2.5%) to allow finger light transmission, while other display regions maintain normal reflectivity characteristics. This is achieved through localized structuring of the light-shielding layer and color film layer in the fingerprint sensing area, enabling the panel to have different optical qualities in different locations to simultaneously achieve fingerprint identification and maintain display quality.
2Object-affected harmful factors
If the total area of openings in the light-shielding layer is reduced to minimize reflectivity, then screen reflectivity decreases, but fingerprint identification accuracy may be affected
Solution Approach 1:
The patent applies parameter changes by optimizing the size, shape, and distribution parameters of the openings in the light-shielding layer. The openings are designed with specific dimensional parameters that allow sufficient light transmission for fingerprint identification while minimizing the total open area to reduce reflectivity. The color film elements are also configured with specific optical parameters (absorption coefficients, thickness) to enhance light absorption in the fingerprint region. By carefully adjusting these parameters, the patent achieves a balance between reducing reflectivity and maintaining fingerprint identification accuracy.
3Object-affected harmful factors
If filter elements are added to the second openings to reduce reflectivity, then screen reflectivity decreases, but the device structure becomes more complex
Solution Approach 1:
The patent applies merging by integrating the filter elements directly into the light-shielding layer structure rather than treating them as separate components. The filter elements are combined with the color film elements, where the color film serves dual functions: as part of the display color filtration system and as a reflectivity reduction element in the fingerprint sensing region. This integration reduces the number of separate layers and components needed, thereby lowering manufacturing complexity while still achieving the reflectivity reduction benefit.
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 design effectively reduces screen reflectivity and enhances fingerprint identification accuracy by utilizing pinhole imaging with reduced hole area and light absorption, ensuring high transmittance for display and identification functions.
Implementation Method 1
a color film layer on a side of the encapsulation layer away from the substrate, including a plurality of color film elements... the second openings each are filled with a filter element... such that the light reflected by the finger is imaged at the position of the photosensitive sensor
Implementation Method 2
the second openings each are used for transmitting light reflected by a finger to the photosensitive sensor, such that the light reflected by the finger is imaged at the position of the photosensitive sensor
Data Source
AI summary
A display panel, a manufacturing method therefor, and a display device. The display panel comprising: a base substrate; a plurality of light emitting devices on the base substrate; an encapsulation layer on a side of the light emitting devices away from the base substrate, configured for encapsulating the plurality of light emitting devices; a photosensitive sensor on a side of the light emitting devices away from the encapsulation layer; a color film layer on a side of the encapsulation layer away from the base substrate, comprising a plurality of color film elements; and a light-shielding layer on a side of the encapsulation layer away from the base substrate, comprising a plurality of first openings and a plurality of second openings, the second openings each being filled with a filter element, and the second openings each being used for transmitting light reflected by a finger toward the photosensitive sensor.