Infrared Touch Display Bezel Minimization via Interference Fit
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Solution Overview
Problem
Display apparatuses with touch screen functions using infrared rays face challenges in minimizing bezel width and preventing increased power consumption and erroneous touch inputs.
Innovation Solution
The display apparatus incorporates a touch screen module with light emitters and receivers on a printed circuit board, surrounded by a light guide member that guides infrared rays, and features an interference fit between the printed circuit board and light guide member for precise assembly, minimizing bezel width and preventing erroneous touch recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a light guide member is used to guide infrared rays in a touch screen module, then the bezel width can be minimized, but the assembly precision between the light guide member and printed circuit board becomes more critical to prevent erroneous touch inputs
Solution Approach 1:
An interference fit coupling mechanism is introduced as an intermediary between the light guide member and printed circuit board. The coupling protrusions on the light guide member engage with coupling holes on the printed circuit board through elastic deformation, creating a precise mechanical connection that ensures accurate alignment and positioning of the infrared ray guidance path, thereby preventing erroneous touch inputs while maintaining minimal bezel width
2Measurement precision
If the light guide member is tightly coupled to the printed circuit board to ensure precise infrared ray guidance, then touch input accuracy is improved, but the complexity of the assembly process increases
Solution Approach 1:
The interference fit coupling mechanism is designed to be self-aligning and self-securing. The elastic deformation of the coupling holes automatically accommodates the coupling protrusions during assembly, and the interference fit itself provides the securing force without requiring additional fasteners or complex alignment procedures. This self-service mechanism achieves precise touch input accuracy while keeping the assembly process relatively simple
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 bezel width, reduces power consumption for touch inputs, and prevents erroneous touch implementations by ensuring accurate infrared ray guidance and reception, enhancing the efficiency and accuracy of touch input detection.
Implementation Method 1
a plurality of light emitters mounted on the printed circuit board and configured to emit infrared rays; a light receiver located on the printed circuit board, spaced apart from the plurality of light emitters, and configured to receive infrared rays
Implementation Method 2
a light guide member surrounding a perimeter of the display module, and configured to guide infrared rays emitted from the plurality of light emitters to be incident into the touch space and guide the infrared rays incident into the touch space to be received by the light receiver
Implementation Method 3
an interference fit is provided between the printed circuit board and the light guide member through elastic deformation of at least one thereof
Data Source
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AI summary
A display apparatus according to an example of the present disclosure includes a printed circuit board on which are mounted a light emitter configured to emit infrared rays and a light receiver configured to receive the infrared rays; and a light guide member surrounding the perimeter of a display module, and configured to guide the infrared rays emitted from the light emitter to be received by the light receiver via a touch space. An interference fit between the printed circuit board and the light guide member may be provided through elastic deformation of at least one thereof.