OLED Display Panel Visible Light Conversion Layer for Fingerprint Accuracy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The poor visible light transmittivity of polyimide (PI) flexible substrates in OLED display screens affects the accuracy of fingerprint identification, requiring holes or grooves that complicate manufacturing and reduce mechanical integrity.
Innovation Solution
Incorporating a visible light conversion layer that converts visible lights into non-visible lights, allowing the fingerprint identification module to operate independently of the display screen's visible light emissions, thus avoiding interference and simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If holes or grooves are provided on the flexible substrate to improve visible light transmittivity for fingerprint detection, then fingerprint identification accuracy is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent changes the wavelength parameter of light from visible light to non-visible light (infrared or ultraviolet). The flexible substrate is made transparent to non-visible light, allowing fingerprint detection without requiring holes or grooves. This parameter change resolves the contradiction by maintaining substrate integrity while enabling accurate fingerprint identification.
Solution Approach 2:
The patent introduces a light conversion layer as an intermediary that converts visible light from the OLED display into non-visible light. This intermediary enables the fingerprint sensor to detect non-visible light that can pass through the flexible substrate, eliminating the need for structural modifications to the substrate while maintaining high detection accuracy.
2Measurement precision
If holes or grooves are provided on the flexible substrate to improve light transmittivity, then fingerprint detection is enabled, but mechanical strength and integrity deteriorate
Solution Approach 1:
The patent changes the light wavelength parameter to non-visible light, which has better transmittivity through the flexible substrate material. This allows the substrate to maintain its full mechanical integrity without holes or grooves, while still enabling fingerprint detection through the non-visible light that passes through the intact substrate.
3Measurement precision
If the fingerprint identification module detects visible lights, then it can identify fingerprints, but it is affected by the display screen's visible light emissions reducing detection accuracy
Solution Approach 1:
The patent changes the detection wavelength from visible light to non-visible light. Since the display screen only emits visible light and not non-visible light, using non-visible light for fingerprint detection eliminates interference from the display emissions, thereby improving detection accuracy without requiring the fingerprint sensor to be affected by visible light emissions.
Solution Approach 2:
The light conversion layer acts as an intermediary that converts the display's visible light into non-visible light, enabling the fingerprint sensor to detect non-visible light versions of the display output. This intermediary process eliminates interference from direct visible light emissions while maintaining the ability to detect fingerprints.
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 enhances the accuracy of fingerprint identification by using non-visible light transmittivity of OLED screens, eliminating the need for holes in the flexible substrate, simplifying manufacturing, and maintaining display quality.
Implementation Method 1
a visible light conversion layer configured to receive visible lights and convert the visible lights into non-visible lights
Data Source
AI summary
A display panel, a display screen, and a display device are provided. The display panel includes a display substrate; a light-emitting layer located on the display substrate and comprising a plurality of light-emitting units; an encapsulation structure disposed on the light-emitting layer to encapsulate the light-emitting layer; and a visible light conversion layer configured to receive visible lights and convert the visible lights into non-visible lights; wherein the visible light conversion layer is disposed in the encapsulation structure or the display substrate.