Infrared Touch Screen Frame Structure Without Filter Strips
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Solution Overview
Problem
The frame of an infrared touch screen protrudes too high relative to the screen surface, affecting the overall visual appearance and requiring additional space for light filter strips, which complicates the structure and increases thickness.
Innovation Solution
Incorporating first and second light-transmitting frames with protrusion parts that redirect infrared light, allowing the infrared light source and receiver to be positioned closer to the light entrance surface, eliminating the need for separate light filter strips and reducing the frame's thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the infrared light source is arranged on the side of the cover close to the light exit surface, then the infrared light can be directly emitted to the infrared receiver, but the frame thickness relative to the screen surface increases
Solution Approach 1:
The patent changes the spatial arrangement by moving the infrared light source from the conventional position near the light exit surface to a position near the light entrance surface. This dimensional repositioning allows the light to travel through the cover in a different path, enabling the light source to be located in a region with less protruding frame structure, thereby reducing the perceived frame thickness while maintaining optical functionality.
2Manufacturing precision
If a separate light filter strip is added to control light direction, then light transmission precision is improved, but the device complexity and frame thickness increase
Solution Approach 1:
The patent merges the light direction control function into the frame structure itself by forming a protrusion part that integrates both structural support and optical function. This protrusion part redirects the infrared light in the required direction without requiring a separate light filter strip, thereby simplifying the overall device structure while maintaining precise light direction control.
Solution Approach 2:
The protrusion part of the frame serves multiple functions simultaneously: it provides structural support for mounting the infrared light source, redirects the infrared light in the correct direction, and eliminates the need for separate light filter strips. This multi-functionality reduces device complexity while maintaining manufacturing precision for light direction control.
3Manufacturing precision
If the frame is designed with high protrusion to accommodate light filter strips, then light transmission control is improved, but the visual appearance and screen-to-body ratio deteriorate
Solution Approach 1:
The patent combines the light transmission control function with the frame's structural protrusion, eliminating the need for separate light filter strips. This integration allows the frame to achieve the necessary light direction control with minimal protrusion, thereby improving the screen-to-body ratio and visual appearance while maintaining manufacturing precision for light transmission control.
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 reduces the frame's thickness relative to the screen surface, enhancing the screen-to-body ratio and simplifying the structure by integrating light redirection within the frames, thus improving the visual appearance and reducing space occupation.
Implementation Method 1
an infrared light source configured to emit infrared light; and a first light-transmitting frame arranged on a side of the cover having the first side surface and connected to the cover. The first light-transmitting frame is provided with a first installation groove, and the infrared light source is installed in the first installation groove
Implementation Method 2
A first protrusion part is provided on a side of the first light-transmitting frame away from the infrared light source, and the first protrusion part is configured to receive at least part of the infrared light from the infrared light source and emit the at least part of the infrared light in a direction parallel to the light exit surface
Data Source
AI summary
An infrared touch screen and a display device are provided. The infrared touch screen includes: a cover having a light entrance surface and a light exit surface connected through a first side surface; a first light-transmitting frame provided with a first installation groove and connected to the cover; and an infrared light source installed in the first installation groove and located on a side of the cover close to the light entrance surface. A first protrusion part is provided on a side of the first light-transmitting frame away from the infrared light source and configured to emit at least part of the infrared light received from the infrared light source.