Stereoscopic Touch Panel with Rotating Lines on Spherical Surface
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Solution Overview
Problem
Conventional spherical displays using Fourier-transfer infrared (FTIR) touch technology require additional light sources and cameras for touch sensing, limiting the sensing area and requiring wires along the surface, which restricts the interactive space and image projection.
Innovation Solution
A stereoscopic touch panel design with dextrorotatory and levorotatory lines on a spherical surface, where wires are arranged outside the sensing area, allowing for capacitive multi-point touch sensing without internal lead wires, simplifying the manufacturing process and expanding the effective sensing area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional FTIR touch technology is used on spherical displays, then touch sensing function is achieved, but additional light sources and cameras are required, increasing device complexity
Solution Approach 1:
The patent extracts the lead wires from the sensing area and relocates them to the non-operating region. This separation allows the sensing area to be fully available for touch detection without internal wire interference, while the lead wires are routed through the non-operating region to connect with driving circuits, thereby reducing device complexity without compromising touch sensing functionality
Solution Approach 2:
The patent utilizes the spherical surface geometry to route lead wires along the surface from the non-operating region to the sensing area contacts. This dimensional approach allows wires to be positioned outside the sensing footprint, enabling full surface coverage for touch sensing while maintaining electrical connectivity through the spherical surface pathway
2Area of stationary object
If wires are arranged along meridians and parallels on the spherical surface, then electrical connection is achieved, but space must be preserved for driving circuits, limiting sensing area
Solution Approach 1:
The patent extracts lead wires from the sensing region and relocates them to the non-operating region. The wires extend from the non-operating region through the spherical surface to connect with the driving circuits, thereby removing the conflict between wire placement and sensing area availability, and maximizing the sensing region coverage
Solution Approach 2:
The patent segments the spherical surface into an operating region and a non-operating region. The lead wires are positioned in the non-operating region, while the sensing contacts are distributed across the operating region. This segmentation allows independent optimization of both regions: the non-operating region accommodates wiring and driving circuits, while the operating region provides full surface coverage for touch sensing
3Ease of manufacture
If lead wires are placed inside the sensing area to transmit signals, then signal transmission is achieved, but the sensing area is reduced and manufacturing becomes complex
Solution Approach 1:
The patent extracts all lead wires from the sensing area and relocates them to the non-operating region. This extraction eliminates the need for wires to be routed through the sensing area, simplifying the manufacturing process by allowing the sensing area to be fully dedicated to touch detection contacts without wire interference
Solution Approach 2:
The patent uses the spherical surface geometry to create a three-dimensional wiring pathway. Lead wires extend from the non-operating region through the spherical surface to reach the sensing contacts, utilizing the spherical dimension to route wires outside the sensing footprint while maintaining electrical connectivity
Data Source
AI summary
A stereoscopic touch panel including a substrate, M dextrorotatory lines and N levorotatory lines is provided. The substrate has a spherical surface including a non-operation region. A polar axis of the spherical surface passes through the non-operation region to define a pole. Each of the M dextrorotatory lines is disposed on the spherical surface and extends from the non-operation region in a direction leaving the pole and rotates a dextrorotatory angle with respect to a meridian direction of the spherical surface. Each of N levorotatory lines is disposed on the spherical surface and extends from the non-operation region in a direction leaving the pole and rotates a levorotatory angle with respect to the meridian direction of the spherical surface. A touch sensing method is also provided.