Touch-Sensing Module Recessed Connecting Space Design
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Solution Overview
Problem
The deformation of light-transmitting covers in touch display modules due to the thickness of anisotropic conductive adhesive and flexible printed circuit boards leads to a decrease in yield, as there is no space to fill the adhesive, affecting the connection between the touch sensing unit and the flexible printed circuit.
Innovation Solution
A touch-sensing module design that includes a sensing unit, an optical unit, a transparent cover, and a flexible circuit unit, with a connecting space between the transparent cover and the flexible circuit unit, where a fixing layer is used to connect them, allowing for a thinner flexible circuit unit that avoids deformation and maintains the shape of the transparent cover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of anisotropic conductive adhesive and flexible printed circuit board is increased to ensure electrical connection, then the connection reliability is improved, but the light-transmitting cover deforms and there is no space to fill adhesive, resulting in decreased manufacturing precision
Solution Approach 1:
The patent transitions from a two-dimensional planar connection to a three-dimensional structure by creating a recessed accommodating space within the light-transmitting cover. This dimensional change allows the flexible printed circuit board and adhesive to be positioned within the recess, eliminating deformation of the cover's outer surface while maintaining reliable electrical connection.
Solution Approach 2:
The anisotropic conductive adhesive serves as an intermediary element that is strategically placed within the recessed space. It mediates between the flexible printed circuit board and the light-transmitting cover, enabling electrical connection without causing surface deformation, thus resolving the conflict between connection reliability and manufacturing precision.
2Strength
If the thickness of flexible printed circuit board is increased to ensure structural stability, then the structural strength is improved, but the accommodating space is reduced, resulting in no space to fill adhesive and decreased productivity
Solution Approach 1:
By creating a recessed accommodating space that extends in the depth dimension, the patent allows the flexible printed circuit board to maintain its structural thickness while the adhesive filling space is provided in the vertical dimension. This resolves the conflict between structural stability and productivity by utilizing three-dimensional space efficiently.
Solution Approach 2:
The flexible printed circuit board and adhesive are nested within the recessed accommodating space of the light-transmitting cover. This nesting arrangement allows the adhesive to be properly filled and cured without requiring additional external space, thereby improving manufacturing yield while maintaining the structural integrity of the flexible circuit board.
3Reliability
If the thickness of anisotropic conductive adhesive is increased to ensure electrical connection, then the electrical conductivity is improved, but the light-transmitting cover deforms, resulting in decreased manufacturing precision
Solution Approach 1:
The anisotropic conductive adhesive is positioned as an intermediary within the recessed space, where it can achieve sufficient thickness for reliable electrical connection without causing deformation of the light-transmitting cover's outer surface. The recess structure isolates the adhesive's thickness effect from the cover's external geometry.
Solution Approach 2:
The patent resolves the conflict by moving the adhesive into the depth dimension through the recessed structure. This allows the adhesive to have the necessary thickness for electrical conductivity while the light-transmitting cover maintains its original shape in the external dimensions, achieving both electrical reliability and manufacturing precision.
Data Source
AI summary
A touch-sensing module includes a sensing unit, an optical unit, a flexible circuit unit, and a transparent cover. The transparent cover is disposed on the optical unit. The sensing unit, the optical unit, and the transparent cover define an accommodating space. A connecting space is defined between the transparent cover and the flexible circuit unit. A fixing layer is disposed in the connecting space to connect the transparent cover and the flexible circuit unit.