Under-Display Fingerprint Module With Single Diaphragm Collimation
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Solution Overview
Problem
Existing fingerprint identification modules under full-screen displays require multiple diaphragm layers, leading to increased thickness and complexity, which hinders the development of thinner, more compact designs.
Innovation Solution
A ridge identification module with a single diaphragm layer and micro-lenses, optimized for light transmittance and collimation, reduces the number of layers and thickness while maintaining effective fingerprint identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple diaphragm layers are used in fingerprint identification modules, then light collimation and identification precision are improved, but module thickness and structural complexity increase
Solution Approach 1:
The patent combines the light collimation function and light shielding function into a single diaphragm layer, eliminating the need for multiple separate diaphragm layers. This merging approach maintains the necessary optical performance while reducing overall module thickness and structural complexity.
Solution Approach 2:
The single diaphragm layer is designed to perform multiple functions simultaneously: light collimation, light shielding, and structural support. This multi-functional design replaces what would traditionally require multiple specialized layers, achieving thickness reduction without sacrificing identification precision.
2Measurement precision
If multiple diaphragm layers are used in fingerprint identification modules, then light collimation and identification precision are improved, but device complexity increases
Solution Approach 1:
The patent merges multiple functional layers into a single integrated diaphragm structure, reducing the number of components that need to be manufactured, assembled, and aligned. This simplification maintains optical performance while significantly reducing device complexity.
3Length of stationary object
If the number of diaphragm layers is reduced to one, then module thickness and complexity are decreased, but light collimation performance may deteriorate
Solution Approach 1:
The patent optimizes key parameters of the single diaphragm layer including hole diameter (1-10 μm), hole depth-to-diameter ratio (0.5-2), and hole spacing to achieve effective light collimation. By carefully controlling these parameters, the single layer compensates for the loss of multiple layers while maintaining thin profile.
Solution Approach 2:
The diaphragm layer features locally optimized structures with specific hole patterns and dimensions tailored for fingerprint light collimation. This localized optimization ensures high collimation performance in the critical fingerprint detection region while maintaining overall layer thinness.
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 achieves a thinner design with improved fingerprint identification precision and signal-to-noise ratio, enhancing the overall fingerprint recognition performance.
Implementation Method 1
a plurality of micro-lenses, located on a side of the diaphragm layer away from the ridge identification substrate, wherein orthographic projections of the micro-lenses on the base substrate cover the orthographic projections of the light transmittance holes on the base substrate
Implementation Method 2
a ridge identification substrate, including a base substrate and a plurality of photosensitive devices arranged on a side of the base substrate in an array mode
Data Source
AI summary
This disclosure relates a ridge identification module, a manufacturing method thereof and a display apparatus. The ridge identification module includes a ridge identification substrate, the ridge identification substrate includes a base substrate and photosensitive devices arranged on a side of the base substrate in an array mode; a diaphragm layer on a side where the ridge identification substrate has the plurality of photosensitive devices, the diaphragm layer includes light transmittance holes in an array mode, orthographic projections of the light transmittance holes are in orthographic projections of the photosensitive devices on the base substrate, a ratio of depths of the light transmittance holes to maximum apertures of the light transmittance holes is ≥⅙ and ≤2; micro-lenses on a side of the diaphragm layer away from the ridge identification substrate, orthographic projections of the micro-lenses cover the orthographic projections of the light transmittance holes on the base substrate.