Fingerprint Identification Substrate With Collimating Optical Structure
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Solution Overview
Problem
Existing fingerprint identification technologies face challenges in integrating with thin and flexible foldable screens, as they require a thick fingerprint identification module that cannot be accommodated without additional structural support, leading to thickness and design issues.
Innovation Solution
A fingerprint identification substrate with a collimating optical structure integrated into the photosensitive modules, using light shading and light transmitting layers with overlapping holes to collimate fingerprint light rays, reducing thickness and allowing for attachment between the OLED display module and a supporting steel sheet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional fingerprint identification module is used, then fingerprint identification function is achieved, but the module thickness increases and additional structural support is required
Solution Approach 1:
The patent merges the collimating optical structure with the fingerprint identification substrate by integrating light shading layers and light transmitting layers directly into the substrate structure. The light transmitting holes are formed in these layers to guide light, eliminating the need for a separate collimating optical structure and reducing overall module thickness while maintaining fingerprint identification functionality.
Solution Approach 2:
The substrate structure serves multiple functions: it provides mechanical support, guides light through the collimating optical structure, and enables fingerprint light detection. The light transmitting holes in the light shading and light transmitting layers simultaneously perform optical collimation and structural integration, reducing the need for additional components.
2Length of stationary object
If the fingerprint identification module is made thinner, then it can be integrated with foldable screens, but the collimation effect deteriorates
Solution Approach 1:
The patent applies local quality by creating light transmitting holes at specific locations within the light shading and light transmitting layers. These holes are strategically positioned and sized to provide effective light collimation for fingerprint detection while maintaining overall substrate thinness. The local optical properties are optimized without requiring the entire module to be thick.
Solution Approach 2:
The patent transitions from a traditional three-dimensional stacked structure to a more planar integration where light guiding functions are achieved through lateral hole patterns in thin layers. The light transmitting holes create optical paths in the vertical dimension while the overall structure remains thin in the thickness dimension, effectively using dimensional optimization to resolve the contradiction.
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 integrated collimating optical structure within the fingerprint identification substrate enhances light collimation while reducing module thickness, enabling effective fingerprint identification on thin and flexible screens without the need for additional structural support.
Implementation Method 1
the collimating optical structure includes light shading layers and light transmitting layers arranged alternately; each of the light shading layers has a plurality of light transmitting holes
Implementation Method 2
the photosensitive modules are configured to collect light rays reflected by a fingerprint
Implementation Method 3
the photosensitive modules are configured to collect light rays reflected by a fingerprint
Data Source
AI summary
The present disclosure provides a fingerprint identification substrate and a display device. The fingerprint identification substrate includes a base substrate, a plurality of photosensitive modules on the base substrate, a collimating optical structure located on light entering sides of the photosensitive modules, a plurality of function layers and an insulation layer between every two adjacent function layers; where the photosensitive modules are configured to collect light rays reflected by a fingerprint; and the collimating optical structure includes light shading layers and light transmitting layers arranged alternately; where each of the light shading layers has a plurality of light transmitting holes; orthographic projections of the light transmitting holes on the base substrate are in orthographic projections of the photosensitive modules on the base substrate.