Infrared Touch Screen Profile Frame with Reflective Filter Strip
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional infrared touch screens suffer from large profile frame size, high touch height, and poor edge touch effect due to the traditional assembly method of placing infrared lamp tubes diagonally above the touch panel.
Innovation Solution
The infrared touch screen design includes a profile frame with a cavity and an opening, where an infrared module is placed below the touch panel, and a filter strip with reflective arc surfaces is used to emit infrared light through total reflection, reducing the profile frame size and improving edge touch effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the infrared lamp tube is placed diagonally above the touch panel in the conventional assembly method, then the infrared light can directly pass through the filter strip to form the touch detection area, but this results in a large profile frame size, high touch height, and poor edge touch effect
Solution Approach 1:
The patent inverts the conventional assembly by placing the infrared module below the touch panel instead of above it. The infrared light passes through the filter strip from below, achieving the same touch detection function while reducing the profile frame size and improving edge touch effect.
Solution Approach 2:
The patent changes the spatial arrangement from a diagonal above-panel configuration to a below-panel configuration with the infrared module. This dimensional repositioning allows the infrared light to pass through the filter strip vertically, reducing the horizontal space required and minimizing the profile frame size.
2Ease of operation
If the infrared lamp tube is placed diagonally above the touch panel, then the assembly is simple, but the touch height becomes high which affects edge touch effect
Solution Approach 1:
The patent inverts the conventional assembly by placing the infrared module below the touch panel instead of above it. The infrared light passes through the filter strip from below, achieving the same touch detection function while reducing the profile frame size and improving edge touch effect.
3Length of stationary object
If the infrared module is placed below the touch panel with the filter strip using total reflection, then the profile frame size is reduced and touch height is lowered, but the structural complexity increases with the cavity and reflective surfaces
Solution Approach 1:
The filter strip serves multiple functions: it filters the infrared light to form the touch detection area and simultaneously uses total internal reflection to redirect the light. This multi-functionality reduces the need for separate components, simplifying the overall structure despite the inverted configuration.
Solution Approach 2:
The filter strip acts as an intermediary element that both filters and redirects the infrared light through total internal reflection. This single component performs what would otherwise require multiple separate elements, reducing structural complexity while achieving the desired compact configuration.
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 design reduces the overall size of the touch frame, lowers the touch height, and enhances the edge touch effect by optimizing the placement of the infrared module and using a filter strip for total reflection of infrared light.
Implementation Method 1
the filter strip is provided with at least two reflective arc surfaces, an infrared light is emitted by the infrared module and is emitted from the opening through a total reflection of the reflective arc surface
Data Source
AI summary
An infrared touch screen includes: a touch panel, a profile frame, an infrared module and a filter strip. The profile frame surrounds an edge of the touch panel, the profile frame is provided with a cavity having an opening; the infrared module is provided in the cavity and located below the touch panel; and the filter strip is provided at the opening. The filter strip is provided with at least two reflective arc surfaces, an infrared light is emitted by the infrared module and is emitted from the opening through a total reflection of the reflective arc surface.