Capacitance Touch Screen Frameless Design via Side Plate Wiring
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Solution Overview
Problem
Conventional capacitance type touch screens have a limited ability to narrow the frame due to the configuration of lead wirings, which restricts the minimization of the frame size, making it difficult to achieve a frameless design.
Innovation Solution
The capacitance type touch screen configuration includes a cover lens with a see-through area and a decorated area, where the film sensor is adhered to the rear surface of the cover lens, with rising portions on the side plates that house most of the second lead wirings, allowing the inner edge of the decorated area to be formed close to the outer periphery of the top plate, potentially achieving a frameless design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If lead wirings are arranged within the top plate boundaries, then the structure is simple and easy to manufacture, but the frame width cannot be narrowed further
Solution Approach 1:
The patent extends the arrangement space of lead wirings from the two-dimensional plane of the top plate to the three-dimensional space including side plates. By positioning lead wirings on the rear surfaces of side plates, the design moves the wiring layout to an additional spatial dimension, enabling frame narrowing while maintaining wiring functionality.
Solution Approach 2:
The patent embeds the lead wirings within the side plate structures, nesting the wiring functionality inside the existing cover lens housing. This allows the wirings to be positioned outside the top plate boundaries while remaining integrated within the overall cover lens assembly, achieving frameless design without excessive structural complexity.
2Area of stationary object
If the decorated area is positioned to cover lead wirings, then the wirings are hidden, but the see-through area is reduced
Solution Approach 1:
The patent extracts the lead wirings from the top plate area and relocates them to the side plates. This separation removes the wirings from the visual field of the see-through area, making them invisible without requiring a decorated area to cover them, thereby preserving the maximum see-through area while hiding the wirings effectively.
3Length of moving object
If the pitch between lead wirings is reduced, then the frame can be narrowed, but the manufacturing precision requirements increase
Solution Approach 1:
By relocating lead wirings to the side plates in a different spatial dimension, the patent eliminates the need to reduce the pitch between wirings on the top plate. The wirings are positioned outside the top plate boundaries, allowing standard pitch dimensions to be maintained while achieving frame narrowing, thus avoiding increased manufacturing precision requirements.
Data Source
AI summary
A capacitance type touch screen includes a cover lens and a film sensor. The film sensor includes a base film, first transparent electrodes arranged side by side extending in an A direction, second transparent electrodes insulated from the first electrodes and arranged side by side extending in B direction while crossing the first electrodes, a plurality of first lead wirings connected to the first electrodes and drawn to connection terminals, and a plurality of second lead wirings connected to the second electrodes and drawn to connection terminals. The first and second wirings are hidden by the cover lens decorated area. The film sensor includes a top-plate-corresponding-portion facing the cover lens top plate rear surface, and rising portions facing a rear surface of at least one of the first and second side plates. All or most of the second wirings is positioned in the rising portions.