In-Vehicle Touch Display Sealant Protrusion Dustproofing
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Solution Overview
Problem
Conventional in-vehicle touch display modules are prone to poor display quality due to dust and particle ingress caused by vibrations and environmental conditions, affecting their performance.
Innovation Solution
An in-vehicle touch display device design featuring a sealant with protrusions and an adhesive layer, including a polyurethane portion and double-sided adhesive tapes, which joins the backlight module and touch display module together, along with an air gap layer and a light exit opening, to prevent foreign matter entry and ensure proper illumination and display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If adhesive tape or glue is used to fix the touch display module to the backlight source, then the assembly is simplified, but dust and particles can enter the module causing poor display quality
Solution Approach 1:
The sealant is divided into multiple functional portions: a first portion that fills the gap between the touch display module and backlight source, and a second portion that forms protrusions extending beyond the module edges. This segmentation allows the sealant to simultaneously provide internal sealing and external protective barriers, preventing dust ingress while maintaining assembly simplicity.
Solution Approach 2:
The invention uses a composite sealing structure combining the sealant material with the existing adhesive tape or glue. The sealant comprises multiple portions with different functions: gap-filling portion for internal sealing and protrusion-forming portion for external protection. This composite approach enhances dustproofing without completely replacing the original adhesive system, balancing manufacturing ease with protective performance.
2Object-affected harmful factors
If a sealant is introduced to prevent dust entry, then display quality is improved, but the device structure becomes more complex
Solution Approach 1:
The sealant is designed to perform multiple functions simultaneously: it fills gaps to prevent dust ingress, forms protective protrusions that extend beyond module edges, and maintains the bonding between components. This multi-functionality reduces the need for separate sealing components, thereby limiting the increase in device complexity while achieving comprehensive dustproofing.
Solution Approach 2:
The invention merges the sealing function with the existing adhesive structure by introducing a sealant that works in conjunction with the adhesive tape or glue. The sealant's first portion integrates with the gap space, while the second portion forms protective protrusions, combining multiple protective functions into a single material application rather than requiring separate sealing components.
3Area of stationary object
If the touch screen size is increased beyond the sealant area, then display area is improved, but edges become exposed to dust entry
Solution Approach 1:
The sealant is segmented into a first portion for internal gap filling and a second portion that forms protrusions extending beyond the touch display module edges. This segmentation ensures that even when the touch screen extends beyond the sealant's main body, the protrusions create an overlapping protective barrier that prevents dust from entering at the exposed edges.
Solution Approach 2:
The sealant protrusions extend in a third dimension beyond the plane of the touch display module, creating an overlapping structure. This dimensional extension ensures that the sealing protection continues beyond the edges of the touch screen, preventing dust ingress at the exposed perimeters while allowing the display area to be maximized.
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 the risk of foreign matter entry, enhances dustproof capabilities, and improves display quality by preventing the liquid crystal layer from adhering to the adhesive layer, thus resisting deformation and maintaining optical integrity.
Implementation Method 1
An adhesive layer is disposed on a side surface of the protrusion facing the lower polarizing film
Implementation Method 2
the air gap layer is disposed between the adhesive layer and the lower polarizing film, and the air gap layer has a thickness ranging from 0.1 mm to 0.2 mm
Implementation Method 3
The sealant further comprises a light exit opening, and the light exit opening is defined between the two protrusions
Data Source
AI summary
The present invention provides an in-vehicle touch display device. The in-vehicle touch display device includes a backlight module, a touch display module, and a sealant. The touch display module is placed over the backlight module. The touch display module includes a touch screen, an upper polarizing film, a liquid crystal layer, and a lower polarizing film sequentially stacked on each other. The sealant joins the backlight module and the touch display module together. The sealant includes two protrusions protruding between the backlight module and the touch display module. An adhesive layer is positioned on a side surface of each protrusion facing the lower polarizing film.