Touch Display PCB Layout With Integrated Capacitive Sensing
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Solution Overview
Problem
Traditional display devices with touch functions require additional touch elements, which are costly and inefficient in terms of space and production, especially when integrating complex touch functions.
Innovation Solution
A touch display device with a printed circuit board and cover, where the second printed circuit integrated on the cover enables direct integration of touch functions, reducing production costs and space by using light emitting elements and capacitive sensing elements to detect capacitance changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional touch elements are integrated with traditional display devices to achieve touch functions, then touch functionality is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the touch sensing function with the existing display structure by integrating a capacitive sensing layer into the display device. The sensing layer is combined with the cover lens and internal structures, eliminating the need for separate touch elements. This merging approach achieves touch functionality while reducing overall device complexity compared to adding independent touch components.
Solution Approach 2:
The cover lens and internal display structures are designed to serve multiple functions: they act as both display components and capacitive sensing elements. The cover lens serves as a protective cover while simultaneously functioning as a capacitive touch sensor, detecting touch inputs through capacitance changes. This multi-functionality reduces the need for additional dedicated touch components.
2Adaptability or versatility
If additional touch elements are integrated with traditional display devices, then touch functions are achieved, but manufacturing cost increases
Solution Approach 1:
The manufacturing process benefits from merging touch sensing functionality with existing display components. The capacitive sensing layer is integrated during the display assembly process, utilizing the same manufacturing steps for the cover lens and internal structures. This eliminates the need for separate touch element assembly, reducing manufacturing complexity and cost.
Solution Approach 2:
The existing display structure components (cover lens, internal structures) serve dual purposes as both display elements and touch sensors. These components inherently possess the capacitive properties needed for touch sensing, eliminating the need for additional specialized touch sensor materials or components that would increase manufacturing cost.
3Adaptability or versatility
If additional touch elements are integrated with traditional display devices, then touch capabilities are enhanced, but space requirements increase
Solution Approach 1:
The touch sensing function is merged into the existing display structure, specifically within the cover lens and internal spacing. The capacitive sensing layer is positioned within the existing device thickness, utilizing the space between the front surface and the display elements. This merging approach enables touch functionality without increasing the overall footprint or requiring additional lateral space.
Solution Approach 2:
The touch sensing functionality is implemented in the vertical dimension rather than requiring additional lateral space. The capacitive sensing layer is positioned within the thickness of the display device, utilizing the z-axis space between the cover lens and the display elements. This dimensional approach allows touch capabilities to be added without increasing the device's planar area.
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 allows for cost-effective and space-efficient implementation of touch functions, enabling more complex touch interactions in a simple manner by integrating touch capabilities directly into the display device.
Implementation Method 1
The capacitive sensing element is electrically connected to the second printed circuit to detect the changing capacitance value of the cover
Implementation Method 2
The light emitting elements are located on the top surface of the printed circuit board and electrically connected to the first printed circuit
Data Source
AI summary
A touch display device includes a printed circuit board and a cover. The printed circuit board has a top surface, a bottom surface and soldering points. The printed circuit board includes a first printed circuit, a light element and a second printed circuit. A part of the first printed circuit is on the top surface or the bottom surface and connected with the corresponding soldering point. The light emitting element is on the top surface and electrically connected to the first printed circuit. On the top surface, the second printed circuit does not overlap with the first printed circuit. The cover covers the printed circuit board. The cover has light transmission areas which are aligned with the light elements. The second printed circuit is configured to provide a capacitance value coupled to a capacitive sensing element coupled between the second printed circuit and the cover.