TWI391317B - 機電系統及顯示器之方法及裝置 - Google Patents
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Description
本發明之技術領域係關於微機電系統(MEMS)(microelectromechanical system)及此種系統之封裝。更特定言之,本發明之領域係關於干涉調變器及將此種干涉調變器製造在一已預圖案化之基板上的方法。
微機電系統(MEMS)包括微機械元件、致動器及電子裝置。微機械元件可使用沉積、蝕刻、及/或將基板及/或所沉積材料層之部分蝕刻掉或添加層以形成電及機電裝置的其它微細加工(micromachining)製程而製成。一類MEMS裝置稱為干涉調變器。如本文中所使用,"干涉調變器"或"干涉光調變器"一詞意指使用光學干涉之原理而有選擇地接收及/或反射光的裝置。在某些實施例中,干涉調變器可包含一對導電板,其一者或二者可整體或部分為透明及/或反射性的且能夠在施加適當電訊號時進行相對運動。在一特定實施例中,一個板可包含一沉積於基板上之固定層,而另一板可包含一藉由一氣隙或腔室而與該固定層分離之金屬膜。如本文更詳述之,一個板相對於另一個板之位置可改變入射於干涉調變器上之光的光學干涉。此種裝置具有廣泛應用,且在此項技術中利用及/或修改此等類型之裝置的特徵以使得其特性可用於改良已有產品及創造尚未開發之新產品是有利的。
本發明之系統、方法及裝置各具有若干態樣,本發明之所要特性是其共同作用之結果。以下將簡要論述本發明之更突出之特性而不限制其範疇。在考慮此論述、且尤其閱讀題為"實施方式"之段落之後,將瞭解本發明之特性如何提供優於其它顯示裝置之優勢。本文所述實施例提供一種封裝結構及在周圍環境中製造封裝結構的方法。
一實施例提供一製造微機電系統裝置之方法。提供一具有複數個槽溝之基板。於基板上沉積至少一個層,其中該層在該等槽溝處不連續。在形成於基板上之第一電極與第二電極之間製造第一腔室,其中該至少一個層包含第一電極。
根據另一實施例,提供一顯示裝置,其包含:一具有形成於其中之複數個凹槽的基板、一形成於該基板之頂部表面上之第一電極與一第二電極、一半反射層,及一形成於鉻層上之透明材料。第一電極與第二電極彼此絕緣且由第一腔室所分隔。半反射層藉由第二腔室而與第二電極相分隔。
根據又一實施例,提供一形成微機電系統裝置之方法。提供一具有一頂部表面之基板,其中複數個凹槽形成於頂部表面中。於基板上沉積至少一個層,其中該至少一個層包含第一導電材料且在凹槽處不連續,從而在頂部表面上形成該層之多列。沉積第二導電材料,其中第二導電材料經定向為與頂部表面上之第一導電材料正交。
根據另一實施例,提供了一顯示裝置。該顯示裝置包含:一具有形成於其中之複數個凹槽的基板、一形成於基板之頂部表面上之用於反射光的第一反射構件及一用於反射光的第二反射構件、一藉由第二腔室而與第二反射構件相分隔之半反射層,及一用於透射光的檢視構件。第一反射構件與第二反射構件彼此絕緣且由第一腔室所分隔,且檢視構件形成於半反射層之上。
以下詳細描述針對本發明之某些特定實施例。然而,本發明可以眾多不同方式加以實施。在本描述中參考了圖式,其通篇中用相同數字指示相同部件。如將由以下描述而顯而易見的,該等實施例可實施於組態來顯示影像之任何裝置中,無論是動態的(例如視訊)或靜態(例如靜止影像)的、且無論是文字的或是圖像的。更特定言之,預期該等實施例可實施於多種電子裝置中或與其相關聯,該等裝置諸如(但不限於)行動電話、無線裝置、個人數位助理(PDA)、掌上型或攜帶型電腦、GPS接收器/導航器、相機、MP3播放器、攝錄機(camcorder)、家用遊戲機、手錶、時鐘、計算器、電視監視器、平板顯示器、電腦螢幕、自動顯示器(例如里程表顯示器等)、座艙控制器及/或顯示器、相機視角之顯示器(例如車輛中之後視相機的顯示器)、電子相片、電子告示板或標記、投影儀、建築結構、包裝及美學結構(例如一件珠寶上之影像顯示)。結構與本文所述之彼等結構相似之MEMS裝置亦可用於非顯示應用中,諸如用於電子切換裝置中。
圖1說明了一包含干涉MEMS顯示器元件之干涉調變器顯示器實施例。在該等裝置中,像素為亮或暗狀態。在亮("開")狀態下,顯示元件將入射可見光之大部分反射至使用者。當在暗("關")狀態時,顯示元件將極少入射可見光反射至使用者。視實施例而定,"開"與"關"狀態之光反射特性可被反轉。MEMS像素可組態來主要反射所選色彩,允許了除黑與白之外的彩色顯示。
圖1為描述在一視覺顯示器之一系列像素中之二相鄰像素的等角視圖,其中每一像素包含一MEMS干涉調變器。在一些實施例中,干涉調變器顯示器包含該等干涉調變器之列/行陣列。每一干涉調變器包含一對彼此相距一可變且可控之距離之反射層以形成一具有至少一可變維之諧振光學腔。在一實施例中,反射層之一者可移動於二位置之間。在第一位置(下文稱為鬆弛位置)中,可移動反射層與一固定部分反射層相距一相對大之距離。在第二位置(下文稱為致動位置)中,可移動反射層更接近於該部分反射層。視可移動反射層之位置而定,反射自二個層之入射光相長性干涉或相消性干涉,從而產生每一像素的總體反射性或非反射性之狀態。
圖1中所描繪之像素陣列之部分包括二相鄰之干涉調變器12a及12b。在左邊的干涉調變器12a中,說明了在鬆弛位置中之可移動反射層14a,其與包括一部分反射層之光學堆疊16a相距一預定距離。在右邊的干涉調變器12b中,說明了在鄰接光學堆疊16b之致動位置中的可移動反射層14b。
如本文所引述,光學堆疊16a與16b(總稱為光學堆疊16)通常包含若干熔融層(fused layer),其可包括一電極層(諸如氧化銦錫)(ITO,indium tin oxide)、一部分反射層(諸如鉻),及一透明介電質。光學堆疊16因此可導電、部分透明且部分反射,且可藉由(例如)將上述層之一或多者沉積於透明基板20上而加以製造。在一些實施例中,該等層經圖案化為平行條帶,且如下所述可形成顯示裝置中之列電極。可移動反射層14a、14b可形成為沉積於柱18頂上之一沉積金屬層或多個層的一系列平行條帶(正交於列電極16a、16b)及一沉積於柱18之間的介入犧牲材料。當將犧牲材料蝕刻掉時,可移動反射層14a、14b藉由已界定間隙19而與光學堆疊16a、16b分隔開。可將高導電性及反射性材料(諸如鋁)用於反射層14,且此等條帶可形成顯示裝置中之行電極。
不施加電壓時,腔室19保持於可移動反射層14a與光學堆疊16a之間,同時可移動反射層14a在機械鬆弛狀態,如圖1中之像素12a所說明。然而,當施加一電位差至所選列及行時,形成於對應像素處的列與行電極之相交處的電容器變為帶電,且靜電力將電極拉至一起。若電壓足夠高,可移動反射層14變形並被壓抵在光學堆疊16上。光學堆疊16內之介電層(未圖示)可防止短路並控制層14與16間之間隔距離,如圖1中右邊之像素12b所說明。該行為是相同的而不用考慮所施加之電位差的極性。藉此方式,可控制反射對非反射性像素狀態之列/行致動在許多方面係類比於習知LCD及其它顯示技術中所用者。
圖2至圖5B說明用於在顯示應用中使用干涉調變器陣列之一個例示性方法與系統。
圖2為說明一個可結合本發明之各態樣之電子裝置的實施例的系統方塊圖。在該例示性實施例中,電子裝置包括一處理器21,其可為任何一般用途之單或多晶片微處理器,諸如ARM、Pentium、Pentium II、Pentium HI、Pentium IV、PentiumPro、8051、MIPS、Power PC、ALPHA,或任何特殊用途微處理器,諸如數位訊號處理器、微控制器,或可程式化閘陣列。如此項技術中所習知,處理器21可組態來執行一或多個軟體模組。除執行作業系統外,處理器可組態來執行一或多個軟體應用程式,包括網頁瀏覽器、電話應用程式、電子郵件程式,或任何其它軟體應用程式。
在一實施例中,處理器21亦組態來與陣列驅動器22通訊。在一實施例中,陣列驅動器22包括向顯示陣列或面板30提供訊號之列驅動器電路24及行驅動器電路26。圖1所說明之陣列之截面如圖2中之線1-1所示。對於MEMS干涉調變器,列/行致動協定可利用圖3所說明之該等裝置的滯後性能(hysteresis property)。舉例而言,可需要10伏特之電位差來使可移動層自鬆弛狀態變形至致動狀態。然而,當電壓自彼值減少時,隨著電壓跌至10伏特以下,可移動層維持其狀態。在圖3之例示性實施例中,可移動層直到電壓跌至2伏特以下才完全鬆弛。因此有一電壓範圍,在圖3所說明之實例中為約3至7V,在此範圍中存在一所施加電壓之窗口,在該窗口內裝置穩定於鬆弛或致動狀態。此於本文中稱為"滯後窗口"或"穩定窗口"。對於具有圖3之滯後特徵的顯示陣列,可設計列/行致動協定使得於列選通期間,所選通列中之待致動之像素承受約10伏特之電壓差,且待鬆弛之像素承受接近零伏特之電壓差。該選通後,像素承受約5伏特之穩態電壓差以使得像素保持於列選通將其置於的任何狀態中。在此實例中,經寫入後,每一像素經受一在3-7伏特之"穩定窗口"內的電位差。此特點使圖1所說明之像素設計於致動或鬆弛之預有狀態中在同樣之所施加電壓條件下穩定。由於無論在致動狀態中還是在鬆弛狀態中,干涉調變器之每一像素基本上是由固定及移動反射層形成之電容器,因此可於滯後窗口內一電壓處保持此穩定狀態而幾乎無功率耗散。若施加之電位固定,則基本上無電流流入像素中。
在典型應用中,顯示圖框之建立可藉由根據第一列中所要之經致動像素之集合而確定行電極之集合。接著將一列脈衝施加至列1電極,致動對應於所確定之行線的像素。接著改變所確定之行電極集合以對應於第二列中所要之經致動像素集合。接著施加一脈衝至列2電極,根據所確定之行電極而致動列2中的適當像素。列1像素不受列2脈衝影響,且保持在列1脈衝期間所設定的狀態中。此可以順序方式在全部列上重複以產生圖框。通常,透過按每秒某所要圖框數的速率連續重複此過程來用新顯示資料刷新及/或更新圖框。用於驅動像素陣列之列及行電極以產生顯示圖框的多種協定亦為吾人所熟知且可結合本發明使用。
圖4、5A及5B說明了一種用於在圖2之3x3陣列上建立顯示圖框的可能的致動協定。圖4說明用於展示出圖3之滯後曲線的像素的行與列電壓位準之一可能集合。在圖4之實施例中,致動一像素包括:將適當行設定為-V偏壓
,並將適當列設定為+△V,其可分別對應於-5伏特與+5伏特。鬆弛像素係藉由將適當行設定為+V偏壓
、並將適當列設定為相同的+△V,從而產生穿過該像素的零伏特電位差而完成。在列電壓保持於零伏特的彼等列中,無論行處於+V偏壓
或-V偏壓
,像素皆穩定於其最初所處之狀態中。亦如圖4所說明,將瞭解可使用與上述該等電壓極性相反的電壓,例如,致動一像素可包括將適當行設定至+V偏壓
、並將適當列設定至-△V。在此實施例中,釋放該像素係藉由將適當行設定至-V偏壓
、並將適當列設定至相同之-△V,從而產生穿過像素的零伏特電位差而完成。
圖5B為一展示了施加至圖2之3x3陣列的一系列的列及行訊號之時序圖,該等訊號將導致圖5A中所說明之顯示排列,其中經致動之像素為非反射性的。在寫入圖5A所說明之圖框之前,像素可為任何狀態,且在此實例中,所有列處於0伏特,且所有行處於+5伏特。藉由此等所施加電壓,所有像素皆穩定於其現存致動或鬆弛狀態中。
在圖5A的圖框中,像素(1,1)、(1,2)、(2,2)、(3,2)及(3,3)被致動。要完成此目的,於列1之"線時間(line time)"期間,將行1及行2設定至-5伏特,且將行3設定至+5伏特。此不改變任何像素之狀態,因為所有像素保持於3-7伏特的穩定窗口中。接著藉由一始自零、升至5伏特、又回到零之脈衝來選通列1。此舉致動像素(1,1)及像素(1,2)並鬆弛像素(1,3)。陣列中無其它像素被影響。為了按需要設定列2,將行2設定至-5伏特並將行1及行3設定至+5伏特。施加至列2之相同選通脈衝就將致動像素(2,2)並鬆弛像素(2,1)及(2,3)。同樣,無陣列之其它像素被影響。類似地藉由將行2及3設定至-5伏特、並將行1設定至+5伏特而設定列3。列3選通脈衝將列3像素設定為圖5A所示。寫入圖框後,列電位為零,而行電位可保持於+5或-5伏特,且顯示器就穩定於圖5A之排列。應瞭解,相同之程序可使用於數十或數百列及行的陣列。亦應瞭解,在以上概述的一般原則內,可大幅改變用以執行列及行致動之電壓之時序、序列及位準,且以上實例僅為例示性的,且任何致動電壓方法皆可與本文所述之系統及方法一同使用。
圖6A及6B為系統方塊圖,其說明一顯示裝置40之實施例。顯示裝置40可為(例如)蜂巢式或行動電話。然而,顯示裝置40之相同組件或其輕微變更亦可說明各種類型之顯示裝置,諸如電視及攜帶型媒體播放器。
顯示裝置40包括外殼41、顯示器30、天線43、揚聲器44、輸入裝置48及麥克風46。如熟習此項技術者所熟知,外殼41一般係由多種製造過程中之任一者而形成,包括射出成形及真空成形。此外,外殼41可由多種材料中的任一種所製成,包括(但不限於)塑料、金屬、玻璃、橡膠及陶瓷、或其組合。在一實施例中,外殼41包括可移除部分(未圖示),該等可移除部分可與不同色彩的、或含有不同標識(logo)、圖片或符號的其它可移除部分相互換。
如本文所述,例示性顯示裝置40之顯示器30可為多種顯示器中之任一種,包括雙穩態顯示器。在其它實施例中,顯示器30包括如上所述之平板顯示器,諸如電漿、EL、OLED、STN LCD或TFT LCD,或非平板顯示器,諸如CRT或其它電子管裝置,如熟習此項技術者所熟知。然而,為描述本實施例之目的,如文中所述,顯示器30包括一干涉調變器顯示器。
圖6B圖解說明了例示性顯示裝置40之一實施例的組件。所說明之例示性顯示裝置40包括外殼41且可包括至少部分封閉於其中的額外組件。例如,在一實施例中,例示性顯示裝置40包括網路介面27,該網路介面包括耦接至收發器47之天線43。收發器47連接至處理器21,該處理器連接至調節硬體52。調節硬體52可經組態來調節訊號(例如對訊號進行濾波)。調節硬體52連接至揚聲器45及麥克風46。處理器21亦連接至輸入裝置48及驅動器控制器29。驅動器控制器29耦接至圖框緩衝器28、及陣列驅動器22,該陣列驅動器又耦接至顯示陣列30。電源50按特定例示性顯示裝置40設計所需將電提供至所有組件。
網路介面27包括天線43及收發器47以使得例示性顯示裝置40可經由網路與一或多個裝置通訊。在一實施例中網路介面27亦可具有一些處理能力以緩解對處理器21之要求。天線43為熟習此項技術者已知的用於傳輸及接收訊號的任何天線。在一實施例中,天線根據IEEE 802.11標準,包括IEEE 802.11(a)、(b)、或(g),而傳輸及接收RF訊號。在另一實施例中,天線根據BLUETOOTH標準傳輸及接收RF訊號。在蜂巢式電話之情形下,天線經設計來接收用於在無線蜂巢電話網路內通訊的CDMA、GSM、AMPS或其它已知訊號。收發器47預處理接收自天線43之訊號以使得其可由處理器21接收並進一步加以處理。收發器47亦處理接收自處理器21之訊號以使得其可經由天線43而自例示性顯示裝置40傳輸。
在一替代實施例中,收發器47可由一接收器所代替。在又一替代實施例中,網路介面27可由一影像源所代替,該影像源可儲存或產生待發送至處理器21之影像資料。舉例而言,影像源可為包含影像資料之數位視訊光碟(DVD)或硬碟機,或產生影像資料之軟體模組。
一般而言處理器21控制例示性顯示裝置40之總體運作。處理器21自網路介面27或影像源接收資料,諸如壓縮影像資料,並將資料處理為原始影像資料或一種易於處理為原始影像資料的格式。處理器21接著將經處理之資料發送至驅動器控制器29或發送至圖框緩衝器28供儲存。原始資料通常指識別一影像內每一位置處之影像特徵的資訊。舉例而言,此種影像特徵可包括色彩、飽和度及灰度級(gray-scale level)。
在一實施例中,處理器21包括微控制器、CPU、或邏輯單元,以控制例示性顯示裝置40之運作。一般而言,調節硬體52包括放大器及濾波器以用於將訊號傳輸至揚聲器45,並接收來自麥克風46之訊號。調節硬體52可為例示性顯示裝置40內之離散組件,或可併入於處理器21或其它組件內。
驅動器控制器29直接自處理器21或自圖框緩衝器28取得由處理器21所產生之原始影像資料並為了高速傳輸至陣列驅動器22而適當重格式化原始影像資料。具體言之,驅動器控制器29將原始影像資料重格式化為一具有類光柵(raster-like)格式的資料流,以使得其時間次序適合於跨越顯示陣列30的掃描。接著驅動器控制器29將格式化之資訊發送至陣列驅動器22。儘管驅動器控制器29(諸如LCD控制器),常作為獨立(stand-alone)積體電路(IC)而與系統處理器21相關聯,但此種控制器可以許多方式實施。其可作為硬體嵌入處理器21中、作為軟體嵌入處理器21中,或與陣列驅動器22一起完全整合於硬體中。
通常,陣列驅動器22接收來自驅動器控制器29之經格式化之資訊並將視訊資料重格式化為一組平行之波形,該組波形被每秒多次施加至數百(有時數千)個來自顯示器之x-y像素矩陣的引線。
在一實施例中,驅動器控制器29、陣列驅動器22及顯示陣列30適合於本文所述之任何類型的顯示器。例如,在一實施例中,驅動器控制器29為一習知顯示器控制器或雙穩態顯示控制器(例如干涉調變器控制器)。在另一實施例中,陣列驅動器22為一習知驅動器或雙穩態顯示驅動器(例如干涉調變器顯示器)。在一實施例中,驅動器控制器29與陣列驅動器22整合。此實施例常見於諸如蜂巢電話、手錶及其它小面積顯示器之高度整合系統中。在又一實施例中,顯示陣列30為一典型顯示陣列或雙穩態顯示陣列(例如包括干涉調變器陣列之顯示器)。
輸入裝置48允許使用者控制例示性顯示裝置40之運作。在一實施例中,輸入裝置48包括小鍵盤(諸如QWERTY鍵盤或電話小鍵盤)、按鈕、開關、觸碰式顯示幕、壓敏或熱敏薄膜。在一實施例中,麥克風46為一用於例示性顯示裝置40之輸入裝置。當用麥克風46來將資料輸入至裝置時,使用者可提供語音指令以控制例示性顯示裝置40之運作。
如此項技術中所熟知的,電源50可包括多種能量儲存裝置。例如,在一實施例中,電源50為可再充電電池,諸如鎳鎘電池或鋰離子電池。在另一實施例中,電源50為可再生性能源、電容器、或太陽能電池,包括塑料太陽能電池及太陽能電池塗料。在另一實施例中,電源50經組態來接收來自壁裝插座之電力。
在某些實施中,如上所述,控制可程式性(control programmability)存在於驅動器控制器中,該驅動器控制器可位於電子顯示系統中之若干位置。在某些情形中,控制可程式性存在於陣列驅動器22中。熟習此項技術者將認識到,上述最佳化可實施於任何數目之硬體及/或軟體組件中及各種組態中。
根據前述原則而運作之干涉調變器之結構細節可大大不同。例如,圖7A-7E說明可移動反射層14及其支撐結構之五個不同實施例。圖7A為圖1之實施例的橫截面,其中一條金屬材料14被沉積於正交地延伸的支撐件18上。在圖7B中,可移動反射層14僅於角落處在繫栓(tether)32上附著至支撐件。在圖7C中,可移動反射層14係自一可變形層34懸垂,其可包含可撓性金屬。可變形層34直接或間接連接至可變形層34之周邊的基板20。將該等連接於文中稱為支撐柱。圖7D所說明之實施例具有支撐柱塞42,可變形層34停置於該等支撐柱塞上。可移動反射層14如圖7A-7C保持懸垂於腔室之上,但可變形層34不藉由填充可變形層34與光學堆疊16之間的孔洞而形成支撐柱。事實上,支撐柱係由用來形成支撐柱塞42之平坦化材料所形成。圖7E所說明之實施例係基於圖7D所示之實施例,但可調適來與圖7A-7C所說明之實施例以及未圖示之額外實施例一起運作。在圖7E所示之實施例中,已使用一額外之金屬或其它導電材料之層來形成一匯流排結構44。此允許訊號沿干涉調變器之背部行進,消除了原本必須形成於基板20上之若干電極。
在諸如圖7所示之實施例中,干涉調變器充當直接檢視(direct-view)裝置,其中自透明基板20之正面,即與配置調變器的側面相反的側面檢視影像。在該等實施例中,反射層14光學地屏蔽干涉調變器的在與基板20相反之反射層側面上的部分,包括可變形層34。此允許組態被屏蔽區域並在其上進行操作而不負面影響影像品質。此屏蔽允許圖7E中之匯流排結構44,其提供將調變器之光學特性與調變器之機電特性(諸如定址及由該定址導致之運動)分離的能力。此可分離之調變器結構使得用於調變器之機電態樣與光學態樣的結構設計及材料可彼此獨立地選出及運作。此外,圖7C-7E所示之實施例具有額外益處,其源自於將反射層14之光學特性與其機械特性退耦,該等機械特性由可變形層34實現。此允許用於反射層14之結構設計及材料就光學特性而言被最佳化,而用於可變形層34之結構設計及材料就所要機械特性而言被最佳化。
如上文所論述,干涉調變器係組態來反射光穿過透明基板且包括移動部件,諸如可移動鏡面14a、14b。因此,為允許此等移動部件移動,較佳建立一間隙或腔室以允許干涉調變器之機械部件(諸如可移動鏡面14a、14b)移動。
圖8A-8C為根據一實施例之形成於已預圖案化之基板上之干涉調變器的橫截面圖。已發現,當使用已預圖案化之基板時,生產具有如上文所述之功能的干涉調變器所涉及的步驟適合於成本效益很高之生產技術。圖8A-8C說明此方法之一實施例,該實施例導致一自與上文參看圖1-7E所述之干涉調變器中的情況相反的側面來檢視之干涉調變器。視裝置之最終應用而定,有時較佳生產一穿過基板檢視之顯示器,而有時較佳生產一穿過干涉調變器之沉積層檢視之顯示器。因此,藉由此設計,不必使用其上將形成干涉調變器的透明基板(諸如圖7A-7E所示之透明基板20)。已預圖案化之基板因此可為不透明或透明。在圖8A-8C所示的經說明實施例中,已預圖案化之基板較佳為非透明,其允許使用一組有利於模壓加工(embossing)的材料。
根據圖8A-8C所示之實施例,干涉調變器形成於一已預圖案化之基板505上。其中形成有槽溝507之基板505較佳藉由一鏡面層所覆蓋以形成下部電極(半反射或反射構件)502,該下部電極502將充當上述之固定層。
基板505可由較佳非透明之聚合物材料形成,具有沿基板表面在一方向上延伸之一系列模壓加工製得之、適當間隔的凹槽或槽溝507。可使用已知技術在多種習知材料中模壓加工出該等凹槽507以較佳具有一帶有錐形側面之凹腔剖面,如圖8A-8C所示。在一較佳實施例中,由複合材料所形成之基板505經模壓、衝壓、燒蝕、模造、或機械壓印而具有槽溝或凹槽,且隨後經烘培以獲得凹腔剖面。熟習此項技術者將瞭解到,此複合材料較佳由不同層中之不同材料形成,及在衝壓或模壓該基板後,烘焙會引起不同層中的不同熱膨脹。在所說明之實施例中,該(等)頂層具有較高之熱膨脹係數,從而導致膨脹為凹槽507。儘管凹腔剖面為較佳,熟習此項技術者將瞭解到,只要凹槽在沉積於基板505之頂部表面上之材料中引起斷裂,凹槽507就可具有其它形狀(例如垂直牆),如下更詳細之論述。應瞭解,凹槽507可藉由除模壓加工外之其它技術而形成於基板505中,諸如(例如)蝕刻。然而,模壓或衝壓因便宜而較佳。
當將材料沉積於此表面結構上時,一些材料將沉積並停留在凹槽507內,且一些材料將沉積並停留於基板505之介於凹槽507之間的頂部表面上。較佳藉由習知沉積技術(諸如某種形式的濺鍍、物理汽相沉積及化學汽相沉積(CVD))來沉積該材料。如圖8A-8C所示,凹槽507之存在於基板505之頂部表面上的沉積層中產生斷裂或不連續。以此方法,沉積干涉調變器結構之下層502、508、510而不經過習知光微影及蝕刻步驟。在此實施例中,產生圖7A-7E之結構的第一組遮罩實際上併入基板505自身中,且事實上,習知遮罩法可由較經濟的模壓加工製程所代替以獲得初始電極圖案。根據此實施例,干涉調變器結構製造之首要步驟因此為沉積下部電極502、介電材料508、及犧牲材料層510。所沉積之下部電極502、介電材料508、及犧牲材料510之層因此成列或條帶地形成於基板505的頂部表面上。條帶結構係由於存在模壓加工得的凹槽507而自然生成。
下部電極502較佳由鋁形成。在其它實施例中,下部電極502可包含其它高反射性金屬,諸如(例如)銀(Ag)或金(Au)。或者,下部電極502可為一經組態來給予合適之光學及機械特性的金屬堆疊。
介電層508較佳沉積於下部電極502上。在一較佳實施例中,介電材料為二氧化矽(SiO2
)。犧牲層510較佳沉積於(且稍候被移除)該結構上以在下部電極502與上部電極或反射構件506之間建立一光學諧振腔,該上部電極或反射構件將沉積於犧牲層510上以形成可移動層,如圖8B所示。在所說明之實施例中,犧牲層510包含矽(Si)。在其它實施例中,此犧牲層510可由鉬(Mo)、鎢(W)或鈦(Ti)形成。所有此等犧牲金屬皆可相對於曝露之介電及電極材料而被有選擇地蝕刻掉,但熟習此項技術者易瞭解到,其它犧牲材料(例如光阻材料)可與其它選擇性蝕刻化學物一起使用。
如圖8B所示,在此實施例中,在干涉調變器結構生產中接下來的是填充槽溝507及先前所沉積結構間之區域。此填充可藉由許多習知沉積/圖案化/蝕刻步驟或藉由回蝕製程(etch back process)來完成,諸如(例如)化學機械研磨(CMP)平坦化步驟。
正交之上部電極條帶506較佳沉積於犧牲層510上,隨後沉積由柱522所分隔之第二或上部犧牲材料520之條帶。此上部電極506係沉積為呈正交於下部電極502之列的多列之條帶,以建立如上所述之列/行陣列。可較佳使用陰影遮罩沉積技術來將上部電極506及犧牲材料520沉積為其所要圖案中之條帶。柱522係由絕緣材料形成、較佳由聚合物或介電材料形成。
接著較佳將一薄的半反射層(較佳50-100埃)530沉積於上部犧牲層520上。在一較佳實施例中,半反射層530為鉻。如圖8B所示,透明材料或檢視構件535被沉積於半反射層530上以向半反射層530提供額外之機械及結構完整性,該半反射層530通常太薄而不足以在移除犧牲層510、520之後支撐其自身。熟習此項技術者將瞭解到,透明基板535提供機械功能以及充當一藉以進行顯示及透光之構件。透明基板535可由固體無機材料(諸如氧化物)形成。在另一實施例中,透明基板535可由透明聚合物形成。半反射層530及透明基板較佳藉由習知沉積技術(諸如濺鍍、PVD及CVD)而加以沉積。
透明材料535及半反射層530較佳蝕刻有開口或孔洞(未圖示)以使得用於犧牲層移除之蝕刻氣體可到達層510及520之犧牲材料。或者,透明材料535可被預圖案化有預蝕刻或預模壓成的開口或孔洞。應瞭解,作為整個封裝過程之一部分,干涉調變器被密封並保護以隔絕於在包括干涉調變器之封裝周圍的環境。較佳地,該等孔洞或開口的直徑與光微影系統所允許者同樣小,且更佳約為2.4微米。熟習此項技術者將瞭解到,開口之尺寸、間隔、及數目將影響犧牲層510、520之移除速率。
較佳使用一選擇性氣體蝕刻過程來移除犧牲層510、520,以建立在可移動電極506周圍的光學腔。可用標準蝕刻技術來移除犧牲層510、520。特定氣體蝕刻過程取決於待移除之材料。例如,可將二氟化氙(XeF2
)用作釋放氣體來移除矽犧牲層。應瞭解,該蝕刻過程為不蝕刻任何介電材料、半反射材料、或電極材料之選擇性蝕刻過程。
圖8C展示了干涉調變器之最終結構,其中有一光學腔環繞移動電極506。如圖8C所示,因為半反射層530在頂上,所以自沉積層側穿過透明基板535在箭頭540之方向上檢視干涉調變器。
在圖8A-8C所示之實施例中,應瞭解,干涉調變器之可移動層506鄰接於透明基板535且固定層502形成於可移動層506之下,使得可移動層506可在該結構之光學腔內移動,如圖8C所示。
熟習此項技術者將瞭解到,在圖8D所示之實施例中,半反射層530較佳為鉻且可補充以一透明電極(較佳一ITO層),並用作電極。如圖8D所示,ITO層532介於透明基板535與鉻層530之間。此ITO-鉻之雙層結構消除了圖8A-8C所示之實施例中對下部電極502及介電質508之需要。在此實施例中,介電層508介於鉻530與上部腔室之間。熟習此項技術者將瞭解到,將第一犧牲層(未圖示)沉積於已預圖案化之透明基板505上並稍後加以移除以形成下部腔室560,並將第二犧牲層(未圖示)沉積於電極506之上以形成上部腔室565。如圖8D所示,電極506沉積於已預圖案化之基板505上,從而於基板505之頂部表面上形成電極條帶,其中電極506之不連續係由槽溝507上之沉積所引起。
如上所述,由透明材料製成之透明的已預圖案化基板,諸如聚合物,可用來建立類似於圖7A-7E所示者之干涉調變器。如圖8E所示,在此干涉調變器中,與圖8A-8C所示之實施例不同,透明預圖案化基板580透光且穿過透明預圖案化基板580進行檢視。熟習此項技術者將瞭解到,製作此干涉調變器之過程類似於以上參看圖8A-8C所描述的方法,但電極結構將反轉。該結構會類似於圖7A-7E之結構,但藉由將前幾層成列沉積於槽溝507上而可去除用以建立該等列的前幾步圖案化及蝕刻步驟。
如圖8E所示,將半反射-ITO雙層530、532沉積於基板580上以形成電極條帶。將介電層508沉積於半反射-ITO雙層530、532上。接著沉積並稍後移除第一犧牲層(未圖示)以形成下部腔室560。將可移動電極506在第一犧牲層上沉積成正交條帶。將第二犧牲層(未圖示)沉積於可移動電極506上並稍後加以移除以形成上部腔室565。如圖8E所示,可移動電極506處於塌陷(collapsed)狀態。為完成該結構,於上部腔室565上形成可變形層570。
儘管上述詳細描述已展示、描述並指出本發明當應用至各種實施例時的新穎特徵,但應瞭解,在不脫離本發明之精神的情況下,熟習此項技術者可進行對所述裝置或過程之形式及細節上的各種省略、替代及變化。如將瞭解的,實施本發明之形式可並不提供本文所述之所有特徵及益處,因為某些特徵可與其他特徵分開使用或實施。
12a...像素
12b...像素
14...反射層
14a...反射層
14b...反射層
16...光學堆疊
16a...光學堆疊/列電極
16b...光學堆疊/列電極
18...柱
19...腔室/間隙
20...基板
21...處理器
22...陣列驅動器
24...列驅動器電路
26...行驅動器電路
28...圖框緩衝器
29...驅動器控制器
30...顯示器/顯示陣列/顯示面板
32...繫栓
34...可變形層
40...顯示裝置
41...外殼
42...支撐柱塞
43...天線
44...揚聲器/匯流排結構
46...麥克風
47...收發器
48...輸入裝置
50...電源
52...調節硬體
502...下部電極
505...基板
506...上部電極
507...槽溝/凹槽
508...介電層
510...犧牲材料(層)
520...上部犧牲材料(層)
522...柱
530...半反射層
532...ITO層
535...透明基板
540...箭頭
560...下部腔室
565...上部腔室
570...可變形層
580...基板
圖1為描繪一干涉調變器顯示器之一個實施例之一部分的等角視圖,在該實施例中第一干涉調變器之可移動反射層在鬆弛位置中而第二干涉調變器之可移動反射層在致動位置中。
圖2為說明一併入了3x3干涉調變器顯示器之電子裝置之一個實施例的系統方塊圖。
圖3為圖1之干涉調變器之一個例示性實施例的可移動鏡像位置對所施加電壓的圖。
圖4為可用來驅動干涉調變器顯示器之列及行電壓的一集合的說明。
圖5A說明圖2之3x3干涉調變器顯示器中之顯示資料的一例示性圖框。
圖5B說明可用來寫入圖5A之圖框之列及行訊號的一個例示性時序圖。
圖6A及6B為說明一包含複數個干涉調變器之視覺顯示裝置之一實施例的系統方塊圖。
圖7A為圖1之裝置的橫截面。
圖7B為一干涉調變器之替代實施例的橫截面。
圖7C為一干涉調變器之另一替代實施例的橫截面。
圖7D為一干涉調變器之又一替代實施例的橫截面。
圖7E為一干涉調變器之額外替代實施例的橫截面。
圖8A-8C為根據一實施例之形成於已預圖案化之基板上之干涉調變器的橫截面。
圖8D為根據另一實施例之形成於已預圖案化之基板上之干涉調變器的橫截面。
圖8E為根據又一實施例之形成於已預圖案化之基板上之干涉調變器的橫截面。
502...下部電極
505...基板
506...上部電極
507...槽溝/凹槽
508...介電層
522...柱
530...半反射層
535...透明基板
540...箭頭
Claims (52)
- 一種製造一機電系統裝置之方法,其包含:提供一具有複數個槽溝之基板;將至少一層沉積於該基板上,其中該層在該等槽溝處不連續;及於一形成於該基板上之第一電極與一第二電極之間建立一第一腔室,其中該至少一層包含該第一電極。
- 如請求項1之方法,其進一步包含使該第一電極與該第二電極絕緣。
- 如請求項2之方法,其中絕緣包含將一介電材料沉積於該第一電極上。
- 如請求項3之方法,其中藉由在形成該第二電極之前將一犧牲材料沉積於該介電材料上及在形成該第二電極之後移除該犧牲材料來建立該第一腔室。
- 如請求項1之方法,其進一步包含在該第二電極與一半反射層之間建立一第二腔室。
- 如請求項5之方法,其中建立該第二腔室包含在形成該半反射層之前將一犧牲材料沉積於該第二電極上及在形成該半反射層之後移除該犧牲材料。
- 如請求項5之方法,其中該半反射層包含鉻。
- 如請求項5之方法,其進一步包含將一透明材料沉積於該半反射層上。
- 如請求項8之方法,其中建立該第一腔室包含在形成該第二電極之前將一犧牲材料沉積於該介電材料上及在形成 該第二電極之後移除該犧牲材料。
- 如請求項9之方法,其中在移除該第一犧牲層之前,該透明材料及該半反射層經蝕刻而具開口。
- 如請求項1之方法,其中提供包含模壓加工出該基板中之該等槽溝。
- 如請求項1之方法,其中提供包含燒蝕出該基板中之該等槽溝。
- 如請求項1之方法,其中提供包含藉由一模製過程來形成該基板中之該等槽溝。
- 如請求項1之方法,其中該至少一個層包括一導電層且該層在該等槽溝處之不連續性圖案化該第一電極
- 如請求項1之方法,其中該機電系統裝置為一干涉調變器。
- 一種藉由請求項1之方法所形成之機電系統裝置。
- 一種顯示裝置,其包含:一經模壓加工的基板,其具有複數個形成於其中之凹槽;一第一電極,其形成於該基板之一頂部表面上,其中該第一電極在該等凹槽處不連續以藉此分隔該第一電極為若干列;一第二電極,其中該第一電極與該第二電極彼此絕緣且由一第一腔室所分隔;一藉由一第二腔室而與該第二電極相分隔之半反射層;及一形成於該半反射層上之透明材料。
- 如請求項17之顯示裝置,其中該第一電極及該第二電極係藉由一沉積於該第一電極上之介電材料而彼此絕緣。
- 如請求項17之顯示裝置,其中該透明材料具有形成於其中之複數個孔洞。
- 如請求項17之顯示裝置,其中該等複數個凹槽之每一者具有一凹腔剖面。
- 如請求項17之顯示裝置,其中該基板不透明。
- 如請求項17之顯示裝置,其中該第一電極與該第二電極正交。
- 如請求項17之顯示裝置,其中該第二電極係組態為可移動的。
- 如請求項23之顯示裝置,其中當該第二電極被移動時該第二腔室較大而該第一腔室較小。
- 如請求項17之顯示裝置,其進一步包含:一處理器,其與該第一電極及該第二電極中之至少一者電氣通訊,該處理器經組態來處理影像資料;及一與該處理器電氣通訊之記憶體裝置。
- 如請求項25之顯示裝置,其進一步包含一驅動器電路,該驅動器電路經組態來發送至少一訊號至該第一電極及該第二電極中之至少一者。
- 如請求項26之顯示裝置,其進一步包含一控制器,該控制器經組態來發送該影像資料之至少一部分至該驅動器電路。
- 如請求項25之顯示裝置,其進一步包含一影像源模組, 該影像源模組經組態來發送該影像資料至該處理器。
- 如請求項28之顯示裝置,其中該影像源模組包含一接收器、一收發器及一傳輸器中之至少一者。
- 如請求項25之顯示裝置,其進一步包含一輸入裝置,該輸入裝置經組態來接收輸入資料並傳達該輸入資料至該處理器。
- 一種形成一機電系統裝置之方法,其包含:提供一具有一頂部表面之基板,其中將複數個凹槽形成於該頂部表面中;將至少一層沉積於該基板上,其中該至少一層包含一第一導電材料且在該等凹槽處不連續,從而形成在該頂部表面上之該等凹槽間的該層之多列;及沉積一第二導電材料,其中該第二導電材料經定向為與該頂部表面上之該第一導電材料正交。
- 如請求項31之方法,其中該至少一層進一步包含一介電層及一犧牲材料。
- 如請求項31之方法,其進一步包含在該第一導電材料與該第二導電材料之間建立一第一腔室。
- 如請求項32之方法,其進一步包含將一半反射層沉積於該第二導電材料上,其中該半反射層與該第二導電材料由一腔室分隔。
- 如請求項33之方法,其中藉由移除在該半反射層與該第二導電材料之間的一犧牲材料來建立在該鉻層與該第二導電材料之間的該腔室。
- 如請求項31之方法,其中提供在該頂部表面中之該等複數個凹槽包含模壓加工。
- 如請求項36之方法,其進一步包含在模壓加工之後烘焙該基板以向該等凹槽之每一者提供一凹腔剖面,其中該基板由一複合材料形成。
- 如請求項37之方法,其中該複合材料之一頂層具有一較該複合材料之一較低層而言更高之熱膨脹係數。
- 一種顯示裝置,其包含:一基板構件,其用於在其上造成不連續沉積物;一形成於該基板之一頂部表面上、用於反射光之第一反射構件及一用於反射光之第二反射構件,其中該第一反射構件與該第二反射構件彼此絕緣且由一第一分隔構件所分隔;一半反射構件,其藉由一第二分隔構件而與該第二反射構件相分隔;及一用於透射光之檢視構件,該檢視構件形成於該半反射構件上。
- 如請求項39之顯示裝置,其中該基板構件包括一凹槽,該凹槽之形狀使得一直接沉積於其上的層在該凹槽之側壁上不連續。
- 如請求項39之顯示裝置,其中該基板構件包括一槽溝,該槽溝之形狀使得一直接沉積於其上的層在該槽溝之側壁上不連續。
- 如請求項39之顯示裝置,其中在該基板構件之該頂部表 面上的該第一反射構件為一不連續層,從而在該頂部表面上形成該第一反射構件之多列。
- 如請求項39之顯示裝置,其中該第二反射構件為一自一附著至一機械層之連接器懸垂的第二反射層。
- 如請求項39之顯示裝置,其進一步包含一介於該第一反射構件及該第二反射構件之間的絕緣構件,其中該絕緣構件為一在該第一反射構件上之介電層。
- 如請求項39之顯示裝置,其中該第二反射構件為一可移動反射層。
- 如請求項39之顯示裝置,其中該半反射構件包括一鉻層。
- 如請求項39之顯示裝置,其中該檢視構件係沉積於該半反射構件上之一透光材料。
- 如請求項39之顯示裝置,其中該第一分隔構件與該第二分格構件包括多個介電柱。
- 一種操作一顯示裝置之方法,其包含:提供一具有複數個槽溝之基板,其中在該基板上形成包含一第一電極之至少一層且其中該層在該等槽溝處不連續,且其中該第一電極藉由一腔室而與一第二電極相分隔;及在該腔室內移動該第二電極。
- 如請求項49之方法,其中移動該第二電極包含於一鬆弛位置與一致動位置之間移動該第二電極。
- 如請求項49之方法,其中移動該第二電極而改變在該第一電極及該第二電極之間的一距離。
- 如請求項49之方法,其中移動該第二電極包含在該第一電極及該第二電極之間施加靜電引力。
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2007
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2008
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- 2008-04-16 US US12/104,280 patent/US7664345B2/en not_active Expired - Fee Related
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2010
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US7587104B2 (en) | 2009-09-08 |
IL180926A0 (en) | 2007-07-04 |
BRPI0515290A (pt) | 2008-07-15 |
AU2005290163A1 (en) | 2006-04-06 |
ATE521008T1 (de) | 2011-09-15 |
US20060067646A1 (en) | 2006-03-30 |
US7373026B2 (en) | 2008-05-13 |
US20080192328A1 (en) | 2008-08-14 |
EP1803015A1 (en) | 2007-07-04 |
US20100129025A1 (en) | 2010-05-27 |
AU2005290163A2 (en) | 2006-04-06 |
TW200626485A (en) | 2006-08-01 |
EP1803015B1 (en) | 2011-08-17 |
US7664345B2 (en) | 2010-02-16 |
US8126297B2 (en) | 2012-02-28 |
US8285089B2 (en) | 2012-10-09 |
US20080192329A1 (en) | 2008-08-14 |
WO2006036385A1 (en) | 2006-04-06 |
US20120140313A1 (en) | 2012-06-07 |
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