Display Apparatus Black Matrix Multiplexing for Fingerprint Recognition
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Solution Overview
Problem
Conventional display modules with integrated fingerprint recognition suffer from reduced fingerprint image area, prolonged recognition time, and image blurriness due to ultra-thinning, leading to poor splicing effects and vulnerability to strong light interference.
Innovation Solution
A display apparatus incorporating a display module with color filters and a black matrix featuring first and second openings, a fingerprint recognition circuit with orthographic projections covering second openings, and a collimating structure comprising light shading layers with light transmitting holes, which screen out small-angle light rays to enhance large-area fingerprint recognition while simplifying fabrication and reducing production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the display module is ultra-thinned to reduce overall device thickness, then the device becomes more compact and portable, but the fingerprint image area is reduced, recognition time is prolonged, and image clarity deteriorates
Solution Approach 1:
The black matrix is segmented into multiple layers with different functions: the first black matrix layer fills pixel gaps for light shielding, while the second black matrix layer forms the collimating structure with light transmitting holes for fingerprint recognition. This segmentation allows the ultra-thin display to maintain both thickness reduction and fingerprint recognition accuracy.
Solution Approach 2:
The patent transitions from a planar 2D display structure to a 3D multi-layer structure by stacking multiple black matrix layers at different positions. The light transmitting holes are arranged in specific three-dimensional patterns that enable collimating light paths, effectively using vertical space to solve the thickness versus recognition accuracy contradiction.
2Length of stationary object
If the display module is ultra-thinned, then device compactness is improved, but stray light interference increases causing image blurriness
Solution Approach 1:
The patent converts the harmful stray light into beneficial collimated light by using the second black matrix layer with light transmitting holes as a collimating structure. The holes are designed to allow only light within a specific angular range to pass through, transforming random stray light into directed collimated light that improves fingerprint image clarity rather than causing blurriness.
Solution Approach 2:
Different regions of the black matrix are assigned different optical properties: areas with light transmitting holes have high light transmission for collimated light, while surrounding areas maintain light shielding properties. This local differentiation allows the ultra-thin structure to selectively control light paths, blocking harmful stray light while transmitting useful collimated light for fingerprint recognition.
3Manufacturing precision
If separate light shading layers are added to screen out stray light, then fingerprint recognition accuracy is improved, but device complexity and production cost increase
Solution Approach 1:
The patent merges the light shielding function and the collimating function into a single integrated black matrix structure consisting of two layers. The first black matrix layer provides light shielding, while the second layer provides collimating light transmitting holes. This merging eliminates the need for separate light shading layers, reducing structural complexity while maintaining fingerprint recognition accuracy.
Solution Approach 2:
The second black matrix layer serves multiple functions simultaneously: it acts as a light shielding layer for pixel definition, a collimating structure with light transmitting holes for fingerprint recognition, and a structural support element. This multi-functionality reduces the total number of components needed, simplifying the overall device structure and production process.
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 enables accurate large-area fingerprint recognition, improves image clarity, and reduces production complexity by multiplexing light shading layers as the black matrix, enhancing recognition accuracy and efficiency while minimizing stray light interference.
Implementation Method 1
a collimating structure, on an incident side of the fingerprint recognition circuit and including at least two light shading layers, wherein each of the light shading layers has a plurality of light transmitting holes
Implementation Method 2
orthographic projections of the light transmitting holes in one of the light shading layers on the plane where the display module is located at least overlap partially with orthographic projections of the corresponding light transmitting holes in another of the light shading layers
Implementation Method 3
a fingerprint recognition circuit, on a side of the display module away from a display surface of the display module and including a plurality of fingerprint recognition elements
Data Source
AI summary
The present disclosure provides a display apparatus including: a display module with a plurality of color filters and a black matrix with a plurality of first openings and a plurality of second openings, and the plurality of color filters are arranged in the plurality of first openings in a one-to-one correspondence; a fingerprint recognition circuit, on a side of the display module away from a display surface of the display module and including a plurality of fingerprint recognition elements; and a collimating structure, on an incident side of the fingerprint recognition circuit and including at least two light shading layers, wherein each of the light shading layers has a plurality of light transmitting holes, and one of the light shading layers is multiplexed as the black matrix.