Infrared Touch Screen Filter Strips for Reduced Frame Thickness
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Solution Overview
Problem
The frame of conventional infrared touch screens protrudes too high relative to the screen surface, affecting visual perception and occupying excessive space.
Innovation Solution
The infrared light source and receiver are positioned on the light incident surface of the cover plate, with infrared filter strips redirecting light parallel to the light emergent surface, reducing the thickness of the frame protrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the infrared light source is disposed on the side of the light emergent surface of the cover plate, then the infrared light source can be installed, but the frame protrusion thickness becomes too large
Solution Approach 1:
The patent inverts the conventional arrangement by placing the infrared light source on the light incident surface instead of the light emergent surface. This reversal allows the light source to emit infrared light through the cover plate from the front, eliminating the need for a thick protruding frame structure and thereby reducing the frame protrusion thickness while maintaining installation feasibility
Solution Approach 2:
The patent changes the spatial dimension of infrared light propagation by introducing infrared filter strips that redirect light from a perpendicular direction to a parallel direction relative to the cover plate surface. This dimensional change in light path allows the infrared light source to be positioned on the incident surface while still achieving effective light reception, thus solving the frame thickness issue
2Shape
If the frame protrusion thickness is reduced, then visual perception is enhanced, but the infrared light source installation becomes difficult
Solution Approach 1:
By inverting the position of the infrared light source to the light incident surface, the patent achieves both goals: the frame protrusion thickness is reduced (improving visual perception) while the infrared light source can still be installed and function properly. The inversion of the light source position eliminates the need for a thick protruding frame
3Length of stationary object
If the infrared light source is positioned on the light incident surface, then the frame thickness is reduced, but the infrared light path configuration becomes complex
Solution Approach 1:
The patent introduces infrared filter strips as intermediary elements that facilitate the redirection of infrared light from the light incident surface to the light emergent surface. These filter strips act as mediators that simplify the overall light path configuration by providing a straightforward redirection mechanism, thereby reducing device complexity despite the inverted light source position
Solution Approach 2:
The infrared filter strips change the dimension of light propagation from perpendicular to parallel relative to the cover plate surface. This dimensional change creates a simplified light path that directly redirects light along the frame edge, reducing the overall complexity of the infrared light path 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 configuration minimizes the frame thickness, enhancing visual perception and reducing space occupation, while maintaining touch functionality.
Implementation Method 1
a first protruding part being on a side of the second end facing away from the infrared light source, the first protruding part being capable of emitting at least part of the infrared light that the infrared light source emits into the first infrared filter strip, in a direction parallel to the light emergent surface
Implementation Method 2
an infrared filter strip on a side of the first side surface of the cover plate... the first protruding part being capable of emitting at least part of the infrared light... in a direction parallel to the light emergent surface
Data Source
AI summary
The infrared touch screen comprises: a cover plate having a light incident surface and a light emergent surface that are connected by a first side face; an infrared light source disposed on a side of the light incident surface of the cover plate; a first frame; and a first infrared filter strip that is connected to the first frame and is disposed on a side of a first side surface of the cover plate, the first infrared filter strip being used for converting at least part of infrared light emitted by the infrared light source to propagate in a direction parallel to the light emergent surface on a side of the light emergent surface of the cover plate.