Display Window With Through Holes For Fingerprint Noise Blocking
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Solution Overview
Problem
Display devices face challenges in recognizing clear fingerprint images due to noise light interference, which affects the accuracy of fingerprint verification systems.
Innovation Solution
The implementation of a display device with a window structure that includes through holes and filling members, where the filling members are designed to transmit visible light while blocking noise light wavelengths, minimizing noise light incidence on the photo sensor and enhancing fingerprint image resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a window structure with through holes and filling members is implemented, then noise light blocking is improved, but device complexity increases
Solution Approach 1:
The window is segmented into multiple functional regions: transparent regions for light transmission, through holes for noise light blocking, and filling members within the holes. This segmentation allows the window to simultaneously perform multiple functions (transmitting visible light while blocking noise light) without requiring a completely new structure, thus improving noise light blocking while limiting the increase in complexity.
Solution Approach 2:
The filling members are nested within the through holes of the window structure. This nesting approach allows the noise light blocking function to be integrated within the existing window framework rather than adding a separate external component, thereby improving noise light blocking capability while minimizing the increase in overall device complexity.
2Strength
If the window thickness is increased to 0.2 mm or more, then structural strength is improved, but fingerprint image recognition clarity deteriorates
Solution Approach 1:
The window exhibits local quality variations with different thickness regions: thicker regions (0.2 mm or more) provide structural strength, while thinner regions maintain optical clarity for fingerprint recognition. The through holes and filling members are strategically positioned to create local thickness variations that simultaneously satisfy both structural and optical requirements.
Solution Approach 2:
The solution moves from a uniform thickness approach to a multi-dimensional thickness profile. By varying the thickness in the vertical dimension (with thicker edges for strength and thinner central regions for clarity) and incorporating through holes with filling members, the window achieves both structural integrity and optical performance that cannot be obtained with a single uniform thickness.
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 solution effectively reduces noise light interference, allowing for improved fingerprint image recognition and verification by optimizing the light-guiding structure within the display device.
Implementation Method 1
Each of the filling members may be configured to transmit light in a visible light wavelength range. Each of the filling members may be configured to block light in a wavelength range other than the visible light wavelength range.
Implementation Method 2
a photoelectric conversion element configured to detect light from the plurality of light-emitting portions
Data Source
AI summary
Provided is a display device including a substrate, a light-emitting element disposed on the substrate and configured to emit light, a photoelectric conversion element configured to detect incident light, and a window disposed on the light-emitting element and the photoelectric conversion element and configured to transmit light. The window includes a plurality of through holes that overlap the photoelectric conversion element in a thickness direction of the substrate, and a filling member disposed in the plurality of through holes.