Sound-on-Display Adhesive Bonding for Thickness Reduction

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Solution Overview

Problem

Conventional electronic devices with sound-on-display (SOD) structures face issues of increased thickness due to a gap between the display and housing, which can lead to damage from drop impacts and suboptimal acoustic performance.

Innovation Solution

The electronic device design incorporates a first adhesive member to adhere the display's edge to the housing, reducing the gap and enhancing vibration force transmission through an actuator located in the housing, which generates sound by vibrating the display.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a gap is maintained between the display and housing to secure vibrating space, then acoustic performance is improved, but device thickness increases

Engineering Contradiction:

Improveacoustic performanceVSAvoiddevice thickness

Core Design Contradiction:

ReliabilityVSLength of moving object

Solution Approach 1:

The patent changes the physical state and spatial parameters by eliminating the gap between display and housing, allowing the display to be directly supported by the housing while maintaining acoustic performance through alternative vibration transmission paths via adhesive members

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent extracts the vibrating space requirement from the gap between display and housing, and instead creates vibration transmission paths through the adhesive members that bond the display edge to the housing, separating the functions of gap maintenance and vibration transmission

Inventive Principle:

Principle #2Taking out (Extraction)

2Reliability

If a gap is maintained between the display and housing, then vibrating space is secured, but display protection against drop impact is reduced

Engineering Contradiction:

Improvevibrating spaceVSAvoiddrop impact damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent merges the functions of gap maintenance and display support by directly bonding the display edge to the housing using adhesive members, eliminating the need for a separate gap structure while providing mechanical support

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The adhesive members serve as pre-positioned support structures that provide mechanical coupling between the display and housing before impact occurs, protecting the display from drop impact damage by distributing forces across the bonded interface

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Length of moving object

If the gap between display and housing is reduced, then device thickness is reduced, but vibration force transmission from actuator to display is weakened

Engineering Contradiction:

Improvedevice thicknessVSAvoidvibration force transmission

Core Design Contradiction:

Length of moving objectVSForce

Solution Approach 1:

The adhesive members act as intermediary elements that directly connect the display edge to the housing, serving as the primary transmission path for vibration forces from the actuator to the display, replacing the gap-based transmission mechanism

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The adhesive members are pre-applied to bond the display edge to the housing, establishing rigid mechanical coupling in advance that ensures efficient vibration force transmission when the actuator operates

Inventive Principle:

Principle #10Preliminary action

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 reduces the device's thickness, enhances acoustic performance, and provides better protection against drop impacts by directly supporting the display and concentrating vibration force.

Implementation Method 1

an actuator 450 located in an inner space of the housing 410 and configured to generate sound by vibrating the display 420

Methodology Applied

Scientific EffectMechanical vibration: Vibration

Implementation Method 2

a first adhesive member 440 disposed along an edge of a surface of the display 420 facing the second direction and configured to adhere the edge of the surface of the display 420 facing the second direction to the surface of the first housing 411 facing the first direction

Methodology Applied

Scientific EffectAdhesion: Adhesive

Data Source

PatentUS20240107213A1Electronic device having structure for generating sound through vibration of display

Publication Date: 2024.03.28 SAMSUNG ELECTRONICS CO LTD

AI summary

According to various embodiments, an electronic device may include: a housing including a first housing oriented in a first direction and a second housing oriented in a second direction that is opposite to the first direction; a display disposed on the surface of the first housing oriented in the first direction; a window disposed on the surface of the display oriented in the first direction; a first adhesive member disposed along the edge of the surface of the display oriented in the second direction, such that the edge of the surface of the display oriented in the second direction is adhered to the surface of the first housing oriented in the first direction; and an actuator which is to positioned in the inner space of the housing so as to he positioned more on the second direction side than the display, and which generates sound by vibrating the display.