Shielding Structure for Ultrasonic Sensor Under Display
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Solution Overview
Problem
The integration of an ultrasonic sensor in electronic devices, such as smartphones, poses aesthetic concerns due to the need for housing modifications and potential interference from display-induced noise, which can affect sensor performance.
Innovation Solution
An electronic device design featuring a support structure with an opening under the display panel, a shielding structure connected to the ground to block noise, and an ultrasonic sensor positioned beneath the shielding structure, allowing ultrasonic signals to pass through while preventing internal visibility and flexural issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the ultrasonic sensor is mounted under the display panel, then the housing structure is simplified and aesthetic appearance is improved, but display-induced noise interferes with sensor performance
Solution Approach 1:
The support structure is divided into multiple regions: a first region with an opening for ultrasonic signal transmission, and a second region providing shielding. This segmentation allows the sensor to be mounted under the display while protecting it from noise by creating distinct functional zones within the support structure.
Solution Approach 2:
A shielding structure is introduced as an intermediary element between the display panel and the ultrasonic sensor. This shielding structure, connected to ground, blocks electromagnetic noise from the display while allowing ultrasonic signals to pass through the opening in the support structure.
2Reliability
If the ultrasonic sensor is exposed through an opening in the housing, then sensor functionality is improved, but aesthetic appearance deteriorates and manufacturing complexity increases
Solution Approach 1:
Instead of creating an opening in the housing (zero-dimensional hole), the solution moves the opening to the support structure (different dimensional plane). The support structure's opening aligns with the display panel area, allowing ultrasonic transmission while keeping the housing surface intact and aesthetic.
3Area of stationary object
If the display panel area is increased, then user demand is satisfied, but display-induced noise affecting the sensor increases
Solution Approach 1:
The support structure provides localized shielding properties in different regions. The first region has an opening for signal transmission while the second region provides noise shielding. This local differentiation allows the display to be large for user satisfaction while the shielding region specifically protects the sensor from display-induced noise.
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 configuration effectively blocks display-induced noise, maintains the device's aesthetic integrity by hiding internal components, and prevents flexural distortions, enhancing the ultrasonic sensor's performance.
Implementation Method 1
a shielding structure that is disposed under at least part of the partial area of the display panel exposed through the opening part, and that is electrically connected with a ground area provided in the electronic device so as to block noise generated from the display panel
Implementation Method 2
an ultrasonic sensor that transmits and receives an ultrasonic signal passing through the display panel
Data Source
AI summary
Disclosed is an electronic device. The electronic device according to an embodiment includes a display panel including a plurality of pixels, a display driver IC that is electrically connected with the display panel and that displays contents using the plurality of pixels, a support structure disposed under one surface of the display panel and having an opening part formed therein through which a partial area of the one surface is exposed, a shielding structure disposed under at least part of the partial area of the display exposed through the opening part, the shielding structure being electrically connected with a ground area provided in the electronic device so as to block noise generated from the display panel driven by the display driver IC, and an ultrasonic sensor disposed under at least part of the shielding structure. Besides, it may be permissible to prepare various other embodiments speculated through the specification.