Display Panel Collimation Light Path to Reduce Fingerprint Crosstalk
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Solution Overview
Problem
Existing display panels suffer from blurry imaging due to stray light at large angles causing crosstalk between adjacent valley and ridge positions, which complicates texture recognition.
Innovation Solution
A display panel design incorporating a collimation light path structure with multiple light-blocking layers, each with light-transmitting holes, aligned to collimate light and prevent crosstalk, integrated with a touch functional layer and color filter layer to enhance manufacturing feasibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a photoelectric sensor is combined with a display panel for texture recognition, then the texture recognition function is enabled, but stray light at large angles causes crosstalk between adjacent valley and ridge positions resulting in blurry imaging
Solution Approach 1:
The light path is segmented into multiple controlled sections using stacked light-blocking layers with light-transmitting holes. Each layer acts as an independent filtering stage that progressively restricts light angles, separating desired light paths from stray light that causes crosstalk.
Solution Approach 2:
The light-blocking layers are positioned specifically at locations where stray light interference occurs most severely. The light-transmitting holes are strategically arranged to allow only light from specific angular ranges to pass through, creating localized optical control zones that maintain imaging clarity while preserving texture recognition functionality.
2Measurement precision
If multiple light-blocking layers are stacked to collimate light and reduce stray light, then imaging clarity is improved, but the device structure becomes more complex
Solution Approach 1:
The light-blocking layers are merged with existing display panel structures such as the color filter layer or touch functional layer. By integrating the collimation function into already-present layers rather than adding completely separate components, the patent reduces overall device complexity while maintaining the light-collimating effect.
Solution Approach 2:
The light-blocking layers serve multiple functions simultaneously: they act as both structural components of the display panel and as optical collimation elements. This multi-functionality reduces the need for additional dedicated components, thereby simplifying the overall device structure despite the sophisticated optical control required.
3Ease of manufacture
If light-blocking layers are integrated into existing layers such as touch functional layer or color filter layer, then manufacturing ease is improved, but the light-blocking effect may be compromised
Solution Approach 1:
The material properties of existing layers are modified or selected to achieve the required light-blocking characteristics. By adjusting parameters such as material composition, thickness, or optical density of the integrated layers, the patent maintains effective light-blocking performance while utilizing existing manufacturing processes and materials.
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 reduces stray light interference, improving texture recognition accuracy by ensuring light is directed to the correct photoelectric sensor, enhancing imaging clarity and manufacturing ease.
Implementation Method 1
a collimation light path structure on a side of the photoelectric sensing structure facing away from the base, the collimation light path structure including at least two light-blocking layers stacked in the normal direction of the plane where the base is located
Implementation Method 2
the display panel emits light, and the photoelectric sensor receives light reflected from valley or ridge positions of a fingerprint and generates corresponding electric signals
Data Source
AI summary
The present disclosure provides a display panel, including: a base; a light-emitting structure on the base; a package layer on the light-emitting structure; a photoelectric sensing structure on the package layer; at least one of a touch functional layer or a color filter layer on the package layer, where the touch functional layer includes a first metal layer structure, a touch insulation layer and a second metal layer structure, and the color filter layer includes a black matrix; a collimation light path structure on the photoelectric sensing structure and including at least two light-blocking layers, where each light-blocking layer has light-transmitting holes and the at least two light-blocking layers include at least one first light-blocking layer, and the first light-blocking layer is disposed in the same layer as the first metal layer structure, the second metal layer structure, the touch insulation layer or the black matrix.