Adhesive Rigidity Gradient for Display Stress Relief
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Solution Overview
Problem
Existing electronic devices that provide tactile sensation through touch operations often suffer from uneven luminance and color issues due to stress and thermal expansion differences between display and touch panels, which affect reliability and user experience.
Innovation Solution
The electronic device incorporates a first adhesive part with lower rigidity than a second adhesive part, using a piezoelectric vibration part to cause flexural vibration, while ensuring the first adhesive part is transparent and has a lower breaking strength to alleviate stress and maintain reliability, thus reducing uneven luminance and color while providing tactile feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid adhesive is used to bond the display panel and touch panel, then bonding strength is improved, but stress concentration occurs causing uneven luminance and color
Solution Approach 1:
The patent changes the rigidity parameter of the adhesive part to be lower than both the display panel and touch panel, allowing the adhesive to deform and relieve stress rather than transmitting it, thereby preventing uneven luminance and color while maintaining bonding function
Solution Approach 2:
The patent uses a composite structure where the adhesive part has different mechanical properties (lower rigidity) compared to the panels it bonds, creating a stress-absorbing interface that maintains bonding strength while preventing stress concentration
2Strength
If the adhesive part has high breaking strength, then structural integrity is improved, but thermal expansion stress causes display defects
Solution Approach 1:
The patent changes the breaking strength parameter of the adhesive to be lower than the panels, creating a sacrificial element that absorbs thermal expansion stress through controlled deformation rather than transmitting it to the display panels
Solution Approach 2:
The low breaking strength adhesive acts as a pre-designed stress buffer that absorbs thermal expansion forces before they can reach the display panels, preventing display defects while maintaining structural integrity
3Ease of operation
If the vibration part is firmly bonded to transmit tactile sensation, then tactile feedback is improved, but stress from bonding causes uneven luminance
Solution Approach 1:
The patent uses adhesive with lower rigidity to bond the vibration part, allowing sufficient tactile vibration transmission while the adhesive's flexibility prevents stress concentration that would cause uneven luminance
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 effectively reduces uneven luminance and color, enhances reliability, and provides appropriate tactile sensation during touch operations by efficiently transmitting vibration and alleviating stress within the display unit, improving user experience and visibility under various lighting conditions.
Implementation Method 1
a piezoelectric element to which a voltage is applied and which generates a vibration
Implementation Method 2
a first adhesive part which is formed so as to cover substantially the entire area of the display surface and which bonds the touch panel and the display panel to each other... the first adhesive part has transparency
Data Source
AI summary
An electronic device 100 includes a display unit 165 including a display part 160 having a display region 160a on which to display an image, a panel member 130 to be touched by a user, and a first adhesive part 150 which is provided so as to cover the display region 160a and which bonds the panel member 130 and the display part 160 together; a vibration part 140 which causes flexural vibration of the display unit 165; and a second adhesive part 155 which bonds the vibration part to the display unit. The rigidity of the first adhesive part 150 is lower than the rigidity of the second adhesive part 155.