Transparent Coating Prevents Adhesive Overflow in Mobile Terminal Optical Path
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Solution Overview
Problem
Adhesives tend to overflow into the light-transmitting hole structure during the assembly of display screens in mobile terminals, affecting the operation of optical devices like proximity sensors by occluding the light transmission path.
Innovation Solution
A transparent coating is applied between the light-transmitting region and the adhesive mounting regions to prevent adhesive overflow, ensuring unobstructed light transmission and maintaining the operational performance of optical devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesives are used to bond the display screen to the frame, then the display screen can be securely assembled, but the adhesives overflow into the light-transmitting hole structure and occlude the light transmission path
Solution Approach 1:
The patent divides the cover plate into distinct functional regions: a light-transmitting region with light-transmitting holes and a non-light-transmitting region for adhesive bonding. This segmentation allows adhesives to be applied in controlled areas away from the light transmission paths, preventing occlusion while maintaining bonding strength.
Solution Approach 2:
The patent applies different material properties to different regions of the cover plate. The light-transmitting region is designed to be transparent with precise hole structures, while the non-light-transmitting region is optimized for adhesive bonding. This local differentiation ensures that adhesive application does not interfere with optical device functionality.
2Area of stationary object
If the screen-to-body ratio is increased, then more display content can be shown, but the space for optical devices and light-transmitting structures is reduced
Solution Approach 1:
The patent utilizes the thickness dimension of the cover plate to accommodate optical devices. By positioning optical devices at different depths within the cover plate structure and using light-transmitting holes that pass through multiple layers, the design maximizes the use of three-dimensional space, allowing high screen-to-body ratio while maintaining optical device functionality.
Solution Approach 2:
The patent nests optical devices within the cover plate structure itself, embedding them in recesses or dedicated cavities. This nesting approach allows optical devices to be integrated without increasing the overall footprint, enabling high screen-to-body ratio designs while maintaining adaptability for various optical components.
3Reliability
If light-transmitting holes are provided in the display screen, then optical devices can function, but adhesives can easily overflow into these holes during assembly
Solution Approach 1:
The patent extracts the adhesive application area from the light-transmitting hole region by providing a separate non-light-transmitting region specifically designated for adhesive bonding. This separation ensures that adhesives are applied away from the light transmission paths, preventing overflow into the holes while maintaining reliable optical device operation.
Solution Approach 2:
The patent designs the cover plate with pre-defined adhesive application regions and positioning structures that guide adhesive placement before assembly. This preliminary preparation of the bonding structure ensures that adhesives are applied in controlled amounts and locations, preventing overflow into light-transmitting holes during the assembly process.
Data Source
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AI summary
This application provides a mobile terminal, and relates to the field of electronic device technologies to address the technical issue that an optical device is occluded by an overflowing adhesive. The mobile terminal according to the embodiments of this application includes a housing, an optical device and a display screen. The display screen includes a display panel and a cover plate, the cover plate is provided with a first mounting region, a second mounting region, and a light-transmitting region and configured to bond to a frame by an adhesive; the second mounting region is located on a lower surface of the cover plate and configured to bond to the display panel by an adhesive; and the light-transmitting region is located on the lower surface of the display screen. The optical device is configured to receive light from the outside or project light to the outside through the light-transmitting region, and a transparent coating is coated at the junction between the light-transmitting region and the first mounting region or the second mounting region to prevent the adhesive from overflowing to the light-transmitting region. In the mobile terminal according to the embodiments of this application, the transparent coating is coated at the junction between the light-transmitting region and the mounting region to effectively prevent the adhesive from overflowing to the light-transmitting region, so that the operation performance of the optical device can be ensured.