支援大量編號的可堆疊模組化被動式觸控顯示方塊

Abstract

近年來，在實體互動介面 (TUI) 領域中所提出的「基於超高頻 (UHF) 無線射頻辨識 (RFID) 技術的被動式互動方塊」可以用來當作數位內容與實體互動介面之間的操作媒介。其近乎無限的編號數量與易維護的特性使其非常適合用於大規模的部屬，但是這些被動式互動方塊本身並不帶有觸控螢幕，因此無法提供像是「觸控」這種更有效率且更直觀的操作方式。 本論文提出了一種帶有觸控螢幕功能的被動式互動方塊，其主要由主動式的基座 (station) 與被動式的方塊 (cube) 兩個部分所組成。主動式基座利用背投影的方式在方塊上呈現數位影像內容，再利用電容式觸控技術來偵測使用者在方塊上的觸控事件。而方塊部分則在內部加入了凹透鏡、凸面鏡與投影膜的設計，並且在投影膜上安裝觸控感應的偵測端。因此當被動式的互動方塊堆疊到主動式的基座上時，便可以在方塊上呈現動態的數位影像內容，並提供偵測觸控操作的功能。我們在此設計下實作出三層的堆疊結構且在單顆方塊上提供 9×9 的觸控矩陣，並驗證其在兩層的堆疊下能夠擁有清晰的畫面 (~10ppi)。如此一來，我們便能透過此系統有效地增強使用者在使用實體互動介面與數位內容進行互動時的體驗與回饋。

Rich-ID passive building blocks, based on UHF RFID technologies, were recently proposed to support interactive semantic construction of digital information as they provide both virtually unlimited IDs and ease-of-maintenance when deployed at scale. However, since these passive stackables are not touchscreens, they do not support direct-touch interactions that are often more effective and intuitive. This paper presents a novel technique to turn Rich-ID building blocks into touchscreens, which is realized by the design of tileable active stations and passive cubes. The tileable active stations provide rear-projection and capacitive touch sensing for the passive RFID building blocks, the cubes, which are extended by lenses, mirrors, and touch-sensing electrodes. The extension allows passive Rich-ID building blocks to provide a modular dynamic visual display and detects touch events when they are stacked on the station. The results show our prototype system successfully provides 3 layers of rich-ID stacking, 9×9 resolution touch sensing per blocks, and an expressive (~10ppi) visual display after 2 layers of stacking. Hence, the tangible interactions during the interactive semantic construction can be effectively enhanced by direct and dynamic touchscreen interactions.