Display Panel Hole Array for Fingerprint Imaging
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Solution Overview
Problem
Current display panel designs face challenges in implementing fingerprint identification, particularly with silicon-based sensors being costly and glass-based sensors having low photosensitivity, and pin-hole imaging solutions struggling with weak light intensity and image quality.
Innovation Solution
A display panel design featuring a light-shielding layer with a hole array, an interface layer with overlapping acquisition areas, and a photosensitive layer with hole imaging areas, where the geometric center points of acquisition areas fall into adjacent areas, and hole imaging areas are tangent to each other, enhancing image overlap and light intensity, allowing for the use of glass-based sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If silicon-based sensors are used for fingerprint identification, then photosensitivity and image quality are improved, but cost and manufacturing complexity increase
Solution Approach 1:
The patent replaces expensive silicon-based sensors with glass-based sensors that are cheaper and easier to manufacture. The glass-based sensors achieve sufficient performance for fingerprint recognition without requiring the high photosensitivity of silicon-based sensors, thereby reducing manufacturing cost and complexity.
Solution Approach 2:
The patent changes the optical parameters of the system by introducing a light-shielding layer with specifically designed hole arrays. This layer concentrates and guides light to the photosensitive elements, compensating for the lower photosensitivity of glass-based sensors and achieving sufficient image quality for fingerprint recognition.
2Ease of manufacture
If glass-based sensors are used for fingerprint identification, then manufacturing cost is reduced, but photosensitivity and image quality deteriorate
Solution Approach 1:
The patent introduces a light-shielding layer with hole arrays as an intermediary component between the display panel and the glass-based sensor. This intermediary structure concentrates and guides light to the photosensitive elements, compensating for the lower photosensitivity of glass-based sensors and enabling sufficient image quality for fingerprint recognition.
Solution Approach 2:
The patent adds a new dimension to the optical path by introducing a light-shielding layer with three-dimensional hole structures. This layer manipulates light propagation in multiple dimensions, concentrating light onto the photosensitive elements and compensating for the lower photosensitivity of glass-based sensors.
3Ease of manufacture
If pin-hole imaging is used with glass-based sensors, then cost is reduced, but light intensity and image quality become insufficient
Solution Approach 1:
The patent segments the light-shielding layer into multiple hole arrays with specific patterns and densities. This segmentation allows different regions to optimize light guidance for different fingerprint areas, increasing overall light intensity reaching the sensor while maintaining cost-effectiveness of glass-based sensors.
Solution Approach 2:
The patent creates a composite structure combining the light-shielding layer with specific optical properties and the glass-based sensor. This composite design optimizes light transmission and concentration, significantly increasing light intensity reaching the photosensitive elements while maintaining the cost advantages of glass-based sensors.
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 design improves image clarity and sensitivity while reducing costs by increasing light intensity and enabling effective fingerprint recognition, replacing expensive silicon-based sensors with glass-based ones.
Implementation Method 1
a light-shielding layer, inside the display panel and between the interface layer and the photosensitive layer, the light-shielding layer being provided with a hole array which has a plurality of holes arranged in an array
Implementation Method 2
the photosensitive layer comprises a plurality of hole imaging areas which are not intersected and are arranged in one-to-one correspondence with the plurality of holes, respectively
Data Source
AI summary
A display panel, an electronic apparatus, and an imaging method of a display panel are provided. The display panel at least includes: an interface layer, at an outermost side of the display panel and configured to function as an interface between the display panel and ambient environment; a photosensitive layer, inside the display panel and below the interface layer; and a light-shielding layer, inside the display panel and between the interface layer and the photosensitive layer, the light-shielding layer being provided with a hole array which has a plurality of holes arranged in an array. The photosensitive layer is configured to acquire at a plurality of hole imaging areas respective images formed respectively therein.