Watch Display Air Layer Structure for Clear Waterproof Inspection
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Solution Overview
Problem
Existing waterproof inspection methods for display apparatuses, such as watches, face challenges in maintaining visibility due to air layer reflections at the boundary with the display member, which affects the reliability of determining waterproof properties.
Innovation Solution
A display apparatus design featuring a light-transmitting protecting plate, a light-transmitting plate positioned below the protecting plate, a display member, an air layer between them, and light reflection prevention layers on the surfaces facing the air layer, layered in the thickness direction of the protecting plate, with the light reflection prevention layers positioned to suppress reflections and enhance visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an air layer is provided between the light transmitting plate and the display for waterproof inspection, then waterproof properties can be tested, but light reflection at the boundary with the air layer worsens visibility of the display
Solution Approach 1:
A light reflection prevention layer is introduced as an intermediary between the air layer and the light transmitting plate/display surfaces. This layer mediates the optical interaction by reducing light reflection at the air layer boundaries, allowing both waterproof inspection and display visibility to coexist without compromising either function
Solution Approach 2:
The optical parameters (reflectivity) at the interfaces between the air layer and adjacent components are changed by applying the light reflection prevention layer. This modifies the light reflection characteristics to reduce glare and improve visibility while preserving the air layer's waterproof testing capability
2Illumination intensity
If the light reflection prevention layer is provided on surfaces facing the air layer, then light reflection is suppressed and visibility is improved, but device complexity increases
Solution Approach 1:
The light reflection prevention function is segmented and applied selectively only to the surfaces facing the air layer, rather than covering all surfaces. This targeted approach reduces the overall complexity by limiting the application area while still achieving the desired optical effect where most needed
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 suppresses light reflections, improves visibility, and ensures reliable waterproof inspection by clearly indicating fogging due to condensation, maintaining high transmittance and vivid color reproduction, even when viewed through polarizing sunglasses.
Implementation Method 1
a light reflection prevention layer which is provided on at least one of a surface of the light transmitting plate facing the air layer and a surface of the display facing the air layer
Implementation Method 2
a drastic change in temperature is applied to the air inside the case and the air is condensed. Then, it is observed to see whether fogging by condensation occurs
Data Source
AI summary
A display apparatus includes the following. A protecting plate is formed of a material which transmits light. A light transmitting plate is positioned below the protecting plate and is positioned in contact with the protecting plate. A display is provided below the light transmitting plate and includes a display region which can be viewed from outside. An air layer is positioned between the light transmitting plate and the display. A light reflection prevention layer is provided on at least one of a surface of the light transmitting plate facing the air layer and a surface of the display facing the air layer. The protecting plate, the light transmitting plate, the display, the air layer, and the light reflection prevention layer are layered in a thickness direction of the protecting plate. A region in the protecting plate overlapped with the display region of the display includes a window with which waterproof inspection is performed.