這類技術的專利應該是一大堆，初步分析一下，利用"multi-screen"與"wireless"關鍵字找美國專利中的分類，主要分佈在主分類為348（電視）、365（靜態資訊儲存與取得）、725（互動影像散布系統）等，也算是切中主題。
接著再由這些分類配合關鍵字multi-screen, wireless, tv等，得出約100件美國核准專利，這樣的數目就非常容易一探究竟。經初步瀏覽之後，發現除了美國公司（microsoft, google）以外，多數為日（sony, canon）、韓（samsung）大廠，尤其是Samsung目前獲得的專利數以及申請公開的數目比任何公司都多，其他如Sony都是做電視很厲害的！（註：這個分析僅是簡單地從標準關鍵字來搜尋，嚴格的分析恐怕不是這麼簡單）
看看其中幾件的權利範圍：
US 8,190,749，這件多螢技術應用在頭戴式顯示器與手機！
Google這件專利名為在多個裝置間存取一互動狀態的方法，也就是在多個裝置之間數位內容互動的技術，使用者可以在第一裝置上輸入指令，而將第二裝置所儲存的資訊傳輸到第一裝置上。簡單透過下圖可以表達這件專利的技術，第二裝置為手機一般的裝置，第一裝置則為電視機等的顯示裝置，透過網路可以交換資訊。此件案子特別的是，其中第一裝置可為頭戴式顯示器（HMD, head-mounted display），也就是將此頭戴式顯示器上所載的資訊可以與另一裝置交換。
根據專利範圍所描述，此頭戴式顯示器上執行的應用程式所產生的資訊與第二裝置上的應用程式產生交互作用，包括傳遞輸入指令與產生的資訊。
- storing contextual information that associates a state of a head-mounted display (HMD) with information that is associated with an interaction with a first application on the HMD to describe an interaction state on the HMD, wherein the state of the HMD comprises information about one or more applications of the HMD which are executed to provide predetermined functionality;
- selecting a second device capable to provide access to the interaction state on the second device via a second application using the stored contextual information;
- making a determination of attributes of the second device; and
- based on the determination, the HMD transferring to the second device the stored contextual information and information associated with a user input to the first application on the HMD such that the second device is capable to provide via the second application access to the interaction state according to the user input to the first application.
US 2009/0284476
這件Apple的專利申請案涉及將使用者界面顯示到另一個裝置上，這對應到Apple TV上與ipad/iphone/ipod的互動。其中描述在手持裝置上的圖形使用者界面（GUI）投射到另一個裝置（如電視）上，顯示裝置將反映出使用者在手持裝置上的操作指令。從此案申請時專利範圍可知，Apple企圖由手持裝置、操作界面以至於顯示裝置端（Apple TV, iTV）等角度主張專利權。
- providing configuration information to a portable media device;
- receiving from the portable media device a first image signal that specifies a first graphical user interface image;
- displaying the first graphical user interface image on a display device of the accessory;
- detecting user operation of an input control of the accessory;
- sending to the portable media device an input signal indicating that the input control was operated;
- receiving from the portable media device a second image signal that specifies a second graphical user interface image to be displayed, the second graphical user interface image reflecting the operation of the input control; and
- displaying the second graphical user interface image on the display device of the accessory.
US 8054319，這應該也算是一個多螢技術
Samsung這件專利更絕了，處理多個螢幕與多種應用的技術，專利涉及多螢幕管理與設定的方法。系統包括有多個螢幕，透過不同的方法顯示多個內容，設定時可指定透過特定方法設定各螢幕顯示的內容與輸出入管道。
權利範圍第1項界定了多螢幕的管理與設定方法，先由數位電視或是機上盒取得服務，產生多個顯示幕，顯示幕可為一個顯示器的多個虛擬顯示區域，接著連結各顯示幕與對應服務，並顯示。
- receiving a plurality of broadcasting services in a digital television or a digital set top box;
- generating a plurality of display screens, wherein each of the plurality of display screens is a virtual screen to present an output composition of a physical display device;
- generating a plurality of logical screens, wherein each of the plurality of logical screens is a virtual screen to be associated with a display screen of the plurality of display screens and a display area on each of the plurality of display screens;
- associating the plurality of broadcasting services with the plurality of logical screens;
- associating the plurality of logical screens with the plurality of display screens;
- discovering a display screen set including active display screens from among the plurality of display screens; and
- discovering a screen set including active logical screens from among logical screens associated with a current display screen,
- wherein each of the plurality of display screens is optionally associated to zero or more video output ports, and
- wherein each of the output ports is for connection to an external device.
我透過一些簡單的APP也算是應用了多螢技術：
Slideshow Remote
https://itunes.apple.com/us/app/slideshow-remote-for-powerpoint/id328556878?mt=8
http://enpan.blogspot.tw/2013/01/remote-presentation-control.html
Doceri（數位白板）
http://doceri.com/
Ron
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