Multi-Layer Light Shielding for Under-Display Fingerprint Accuracy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display apparatuses with fingerprint identification modules suffer from crosstalk issues due to large-angle light rays penetrating through gaps between light shield layers, leading to fingerprint fuzziness.
Innovation Solution
The display apparatus incorporates at least two light shield layers with mutually independent openings and a planarization layer with grooves between them, where the grooves do not overlap with the openings, and a light blocking part is arranged in each groove to shield crosstalk light, reducing the collimation angles of light rays and improving fingerprint identification accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If light shield layers are used to block light, then fingerprint identification accuracy is improved, but crosstalk light still penetrates through gaps between layers
Solution Approach 1:
The light shielding function is divided into multiple independent light shield layers, each with its own openings and groove structures. This segmentation allows each layer to contribute to light blocking while the grooves capture crosstalk light that passes between layers, preventing it from reaching the fingerprint identification module.
Solution Approach 2:
The invention introduces grooves as a vertical dimension feature between adjacent light shield layers. These grooves extend into the spacing between layers, creating a three-dimensional light trapping structure that captures crosstalk light in the vertical dimension, complementing the horizontal light blocking of the layers themselves.
2Object-affected harmful factors
If multiple light shield layers are added to reduce crosstalk, then light interference is reduced, but device structure becomes more complex
Solution Approach 1:
The groove structures are integrated directly into the spacing regions between adjacent light shield layers, merging the light trapping function with the existing layer arrangement. This combination reduces the need for separate components while effectively capturing crosstalk light that would otherwise pass through the gaps.
3Object-affected harmful factors
If grooves are added to capture crosstalk light, then crosstalk light transmittance is reduced, but manufacturing process becomes more difficult
Solution Approach 1:
The grooves are formed in advance during the light shield layer fabrication process, before the layers are assembled together. This preliminary formation of grooves simplifies the overall manufacturing process by integrating the light trapping structure creation into the existing fabrication sequence, rather than requiring post-assembly modifications.
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 effectively reduces crosstalk light transmittance, enhances fingerprint image clarity, and improves the accuracy of fingerprint identification by minimizing light interference between adjacent openings.
Implementation Method 1
a light blocking part is arranged in the groove
Implementation Method 2
openings of one of the at least two light shield layers and openings of another of the at least two light shield layers overlap in a direction perpendicular to the fingerprint identification module
Data Source
AI summary
The present disclosure provides a display apparatus and a method for manufacturing the same. The display apparatus includes: a self-luminous display module, a fingerprint identification module below the self-luminous display module, at least two light shield layers between the self-luminous display module and the fingerprint identification module, and a planarization layer correspondingly arranged on one side, facing the self-luminous display module, of each light shield layer. Each light shield layer includes a plurality of mutually-independent openings; openings of one of the at least two light shield layers and openings of another of the at least two light shield layers overlap in a direction perpendicular to the fingerprint identification module; the planarization layer between two adjacent light shield layers includes a groove; and the groove and the openings do not overlap in the direction perpendicular to the fingerprint identification module, and a light blocking part is arranged in the groove.