本(ben)發明涉及圖像傳感器(qi)技術領(ling)域，更具體地，涉及一種高靈敏(min)度的相(xiang)位檢(jian)測像素單元及其驅動方法(fa)。

背景技術：

隨著圖(tu)像(xiang)傳感器(qi)技(ji)術(shu)的(de)(de)(de)不(bu)(bu)斷(duan)發展(zhan)(zhan)，cmos圖(tu)像(xiang)傳感器(qi)由(you)于(yu)具有高集成度(du)、低功耗(hao)等(deng)優點(dian)，在電子、監(jian)控、導航、交通等(deng)領域應用(yong)越來越廣泛。但隨著cmos圖(tu)像(xiang)傳感器(qi)技(ji)術(shu)的(de)(de)(de)不(bu)(bu)斷(duan)發展(zhan)(zhan)，對cmos圖(tu)像(xiang)傳感器(qi)性能的(de)(de)(de)要求也越來越高。

對焦(jiao)速度是衡量cmos圖(tu)像傳感器性能(neng)的一個重要指標(biao)，對焦(jiao)時間越短，cmos圖(tu)像傳感器的性能(neng)就越好。

在現有的(de)幾種對(dui)焦方(fang)(fang)法(fa)中，對(dui)比度法(fa)對(dui)焦技術(shu)算法(fa)復(fu)雜(za)；反(fan)差(cha)對(dui)焦方(fang)(fang)法(fa)由于需要(yao)完成一次完整的(de)焦點掃描，使得對(dui)焦時間(jian)較長；主動(dong)式對(dui)焦方(fang)(fang)法(fa)需要(yao)配(pei)置紅外線或(huo)超(chao)聲波(bo)測距裝置，而且對(dui)于光滑面、遠距離(li)和(he)吸(xi)光物(wu)體難以實(shi)現對(dui)焦。因此相位檢測像素結構的(de)出(chu)現受到了廣(guang)泛關注。

然(ran)而(er)，由于一個(ge)(ge)相位檢(jian)測(ce)像素單元具有兩(liang)個(ge)(ge)光電二極(ji)管和(he)兩(liang)個(ge)(ge)信號讀取(qu)電路(lu)，而(er)制作兩(liang)個(ge)(ge)信號讀取(qu)電路(lu)時(shi)的工藝誤差會帶(dai)來降低相位檢(jian)測(ce)靈敏度(du)的問題，進而(er)會降低對(dui)焦時(shi)的準確率。

技術實現要素：

本發明的目的在(zai)于(yu)克(ke)服現(xian)有技(ji)術存在(zai)的上(shang)述缺陷，提供(gong)一種高(gao)靈敏度的相(xiang)位檢(jian)測像素單元及其驅動方法(fa)，以提高(gao)相(xiang)位差檢(jian)測的靈敏度。

為實現上述目的，本發明的技術方案(an)如(ru)下：

一種高靈敏度(du)的相位檢測像素單元，包括(kuo)：

一個(ge)相位(wei)檢測像素(su)，其包(bao)括兩個(ge)并列的感光單元(yuan)，用于將各(ge)自接受的光信(xin)號(hao)轉(zhuan)化(hua)為(wei)電信(xin)號(hao)，并隨入射光角度的變化(hua)，產生相位(wei)差；

一個(ge)信(xin)號采樣(yang)保(bao)持單(dan)元(yuan)(yuan)(yuan)，其(qi)包括(kuo)兩個(ge)相(xiang)同的(de)相(xiang)位保(bao)持子單(dan)元(yuan)(yuan)(yuan)，兩個(ge)相(xiang)位保(bao)持子單(dan)元(yuan)(yuan)(yuan)的(de)輸(shu)入(ru)端(duan)分別與兩個(ge)感光單(dan)元(yuan)(yuan)(yuan)的(de)輸(shu)出端(duan)相(xiang)連，用(yong)于傳(chuan)輸(shu)和儲存兩個(ge)感光單(dan)元(yuan)(yuan)(yuan)產(chan)生的(de)電信(xin)號；

一(yi)個信號(hao)復位輸(shu)出單元，其輸(shu)入端與兩(liang)個相(xiang)位保持子單元的輸(shu)出端同時相(xiang)連，用(yong)于(yu)對電路(lu)復位和輸(shu)出電信號(hao)。

優選(xuan)地(di)，兩個(ge)(ge)所述感光單元在其上方共用一個(ge)(ge)顯微鏡頭和一個(ge)(ge)濾(lv)光片。

優選(xuan)(xuan)(xuan)(xuan)地(di)(di)(di)，所述(shu)感光(guang)單(dan)元(yuan)為光(guang)電(dian)(dian)(dian)(dian)(dian)二極(ji)(ji)(ji)(ji)(ji)(ji)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)，每(mei)(mei)個(ge)(ge)相(xiang)(xiang)(xiang)(xiang)(xiang)位(wei)保(bao)持子單(dan)元(yuan)包(bao)括(kuo)一(yi)(yi)(yi)個(ge)(ge)光(guang)電(dian)(dian)(dian)(dian)(dian)開(kai)(kai)(kai)(kai)關(guan)(guan)mos管(guan)(guan)(guan)(guan)(guan)(guan)(guan)、一(yi)(yi)(yi)個(ge)(ge)電(dian)(dian)(dian)(dian)(dian)容(rong)開(kai)(kai)(kai)(kai)關(guan)(guan)mos管(guan)(guan)(guan)(guan)(guan)(guan)(guan)、一(yi)(yi)(yi)個(ge)(ge)電(dian)(dian)(dian)(dian)(dian)容(rong)以及一(yi)(yi)(yi)個(ge)(ge)選(xuan)(xuan)(xuan)(xuan)擇(ze)開(kai)(kai)(kai)(kai)關(guan)(guan)mos管(guan)(guan)(guan)(guan)(guan)(guan)(guan)，信(xin)號(hao)(hao)復(fu)(fu)位(wei)輸(shu)(shu)(shu)出單(dan)元(yuan)包(bao)括(kuo)一(yi)(yi)(yi)個(ge)(ge)復(fu)(fu)位(wei)mos管(guan)(guan)(guan)(guan)(guan)(guan)(guan)、一(yi)(yi)(yi)個(ge)(ge)輸(shu)(shu)(shu)出mos管(guan)(guan)(guan)(guan)(guan)(guan)(guan)和(he)(he)(he)(he)一(yi)(yi)(yi)個(ge)(ge)偏置(zhi)mos管(guan)(guan)(guan)(guan)(guan)(guan)(guan)；其中，每(mei)(mei)個(ge)(ge)光(guang)電(dian)(dian)(dian)(dian)(dian)二極(ji)(ji)(ji)(ji)(ji)(ji)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)(de)(de)陽極(ji)(ji)(ji)(ji)(ji)(ji)分別與(yu)電(dian)(dian)(dian)(dian)(dian)源(yuan)負極(ji)(ji)(ji)(ji)(ji)(ji)相(xiang)(xiang)(xiang)(xiang)(xiang)連(lian)(lian)，每(mei)(mei)個(ge)(ge)相(xiang)(xiang)(xiang)(xiang)(xiang)位(wei)保(bao)持子單(dan)元(yuan)中光(guang)電(dian)(dian)(dian)(dian)(dian)開(kai)(kai)(kai)(kai)關(guan)(guan)mos管(guan)(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)(de)(de)源(yuan)極(ji)(ji)(ji)(ji)(ji)(ji)和(he)(he)(he)(he)一(yi)(yi)(yi)個(ge)(ge)光(guang)電(dian)(dian)(dian)(dian)(dian)二極(ji)(ji)(ji)(ji)(ji)(ji)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)(de)(de)陰極(ji)(ji)(ji)(ji)(ji)(ji)相(xiang)(xiang)(xiang)(xiang)(xiang)連(lian)(lian)，漏(lou)(lou)極(ji)(ji)(ji)(ji)(ji)(ji)和(he)(he)(he)(he)電(dian)(dian)(dian)(dian)(dian)容(rong)開(kai)(kai)(kai)(kai)關(guan)(guan)mos管(guan)(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)(de)(de)漏(lou)(lou)極(ji)(ji)(ji)(ji)(ji)(ji)、選(xuan)(xuan)(xuan)(xuan)擇(ze)開(kai)(kai)(kai)(kai)關(guan)(guan)mos管(guan)(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)(de)(de)源(yuan)極(ji)(ji)(ji)(ji)(ji)(ji)相(xiang)(xiang)(xiang)(xiang)(xiang)連(lian)(lian)，電(dian)(dian)(dian)(dian)(dian)容(rong)的(de)(de)(de)(de)(de)一(yi)(yi)(yi)端(duan)(duan)與(yu)電(dian)(dian)(dian)(dian)(dian)容(rong)開(kai)(kai)(kai)(kai)關(guan)(guan)mos管(guan)(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)(de)(de)源(yuan)極(ji)(ji)(ji)(ji)(ji)(ji)相(xiang)(xiang)(xiang)(xiang)(xiang)連(lian)(lian)，另一(yi)(yi)(yi)端(duan)(duan)接地(di)(di)(di)，選(xuan)(xuan)(xuan)(xuan)擇(ze)開(kai)(kai)(kai)(kai)關(guan)(guan)mos管(guan)(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)(de)(de)柵(zha)極(ji)(ji)(ji)(ji)(ji)(ji)連(lian)(lian)接像素選(xuan)(xuan)(xuan)(xuan)擇(ze)信(xin)號(hao)(hao)，兩個(ge)(ge)光(guang)電(dian)(dian)(dian)(dian)(dian)開(kai)(kai)(kai)(kai)關(guan)(guan)mos管(guan)(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)(de)(de)柵(zha)極(ji)(ji)(ji)(ji)(ji)(ji)相(xiang)(xiang)(xiang)(xiang)(xiang)連(lian)(lian)，并(bing)連(lian)(lian)接光(guang)電(dian)(dian)(dian)(dian)(dian)開(kai)(kai)(kai)(kai)關(guan)(guan)選(xuan)(xuan)(xuan)(xuan)擇(ze)信(xin)號(hao)(hao)，兩個(ge)(ge)電(dian)(dian)(dian)(dian)(dian)容(rong)開(kai)(kai)(kai)(kai)關(guan)(guan)mos管(guan)(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)(de)(de)柵(zha)極(ji)(ji)(ji)(ji)(ji)(ji)相(xiang)(xiang)(xiang)(xiang)(xiang)連(lian)(lian)，并(bing)連(lian)(lian)接電(dian)(dian)(dian)(dian)(dian)容(rong)選(xuan)(xuan)(xuan)(xuan)擇(ze)信(xin)號(hao)(hao)，復(fu)(fu)位(wei)mos管(guan)(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)(de)(de)漏(lou)(lou)極(ji)(ji)(ji)(ji)(ji)(ji)和(he)(he)(he)(he)電(dian)(dian)(dian)(dian)(dian)源(yuan)正極(ji)(ji)(ji)(ji)(ji)(ji)相(xiang)(xiang)(xiang)(xiang)(xiang)連(lian)(lian)，源(yuan)極(ji)(ji)(ji)(ji)(ji)(ji)和(he)(he)(he)(he)兩個(ge)(ge)選(xuan)(xuan)(xuan)(xuan)擇(ze)開(kai)(kai)(kai)(kai)關(guan)(guan)mos管(guan)(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)(de)(de)漏(lou)(lou)極(ji)(ji)(ji)(ji)(ji)(ji)相(xiang)(xiang)(xiang)(xiang)(xiang)連(lian)(lian)，柵(zha)極(ji)(ji)(ji)(ji)(ji)(ji)與(yu)一(yi)(yi)(yi)個(ge)(ge)復(fu)(fu)位(wei)信(xin)號(hao)(hao)相(xiang)(xiang)(xiang)(xiang)(xiang)連(lian)(lian)，輸(shu)(shu)(shu)出mos管(guan)(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)(de)(de)柵(zha)極(ji)(ji)(ji)(ji)(ji)(ji)與(yu)復(fu)(fu)位(wei)mos管(guan)(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)(de)(de)源(yuan)極(ji)(ji)(ji)(ji)(ji)(ji)、兩個(ge)(ge)選(xuan)(xuan)(xuan)(xuan)擇(ze)開(kai)(kai)(kai)(kai)關(guan)(guan)mos管(guan)(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)(de)(de)漏(lou)(lou)極(ji)(ji)(ji)(ji)(ji)(ji)相(xiang)(xiang)(xiang)(xiang)(xiang)連(lian)(lian)，輸(shu)(shu)(shu)出mos管(guan)(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)(de)(de)漏(lou)(lou)極(ji)(ji)(ji)(ji)(ji)(ji)和(he)(he)(he)(he)電(dian)(dian)(dian)(dian)(dian)源(yuan)正極(ji)(ji)(ji)(ji)(ji)(ji)相(xiang)(xiang)(xiang)(xiang)(xiang)連(lian)(lian)，源(yuan)極(ji)(ji)(ji)(ji)(ji)(ji)和(he)(he)(he)(he)偏置(zhi)mos管(guan)(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)(de)(de)漏(lou)(lou)極(ji)(ji)(ji)(ji)(ji)(ji)相(xiang)(xiang)(xiang)(xiang)(xiang)連(lian)(lian)，并(bing)作為像素的(de)(de)(de)(de)(de)信(xin)號(hao)(hao)輸(shu)(shu)(shu)出端(duan)(duan)，偏置(zhi)mos管(guan)(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)(de)(de)源(yuan)極(ji)(ji)(ji)(ji)(ji)(ji)接地(di)(di)(di)，柵(zha)極(ji)(ji)(ji)(ji)(ji)(ji)與(yu)一(yi)(yi)(yi)個(ge)(ge)偏置(zhi)電(dian)(dian)(dian)(dian)(dian)壓(ya)相(xiang)(xiang)(xiang)(xiang)(xiang)連(lian)(lian)。

優(you)選(xuan)(xuan)地(di)，所述感光(guang)(guang)(guang)單元(yuan)(yuan)為光(guang)(guang)(guang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)二(er)極(ji)(ji)(ji)管(guan)(guan)(guan)(guan)(guan)(guan)，每個(ge)(ge)(ge)(ge)相(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)位(wei)保(bao)持子單元(yuan)(yuan)包(bao)括(kuo)一(yi)個(ge)(ge)(ge)(ge)光(guang)(guang)(guang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)開(kai)關(guan)(guan)mos管(guan)(guan)(guan)(guan)(guan)(guan)、一(yi)個(ge)(ge)(ge)(ge)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容開(kai)關(guan)(guan)mos管(guan)(guan)(guan)(guan)(guan)(guan)、一(yi)個(ge)(ge)(ge)(ge)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容以(yi)及一(yi)個(ge)(ge)(ge)(ge)選(xuan)(xuan)擇(ze)開(kai)關(guan)(guan)mos管(guan)(guan)(guan)(guan)(guan)(guan)，信(xin)(xin)號(hao)復(fu)(fu)位(wei)輸(shu)(shu)(shu)出單元(yuan)(yuan)包(bao)括(kuo)一(yi)個(ge)(ge)(ge)(ge)復(fu)(fu)位(wei)mos管(guan)(guan)(guan)(guan)(guan)(guan)、一(yi)個(ge)(ge)(ge)(ge)輸(shu)(shu)(shu)出mos管(guan)(guan)(guan)(guan)(guan)(guan)和(he)一(yi)個(ge)(ge)(ge)(ge)偏置mos管(guan)(guan)(guan)(guan)(guan)(guan)；其中，每個(ge)(ge)(ge)(ge)光(guang)(guang)(guang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)二(er)極(ji)(ji)(ji)管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)(de)陽極(ji)(ji)(ji)分(fen)別與電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)(yuan)(yuan)負極(ji)(ji)(ji)相(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)連(lian)，每個(ge)(ge)(ge)(ge)相(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)位(wei)保(bao)持子單元(yuan)(yuan)中光(guang)(guang)(guang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)開(kai)關(guan)(guan)mos管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)(de)漏(lou)極(ji)(ji)(ji)和(he)一(yi)個(ge)(ge)(ge)(ge)光(guang)(guang)(guang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)二(er)極(ji)(ji)(ji)管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)(de)陰極(ji)(ji)(ji)相(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)連(lian)，源(yuan)(yuan)(yuan)(yuan)(yuan)極(ji)(ji)(ji)和(he)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容開(kai)關(guan)(guan)mos管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)(de)源(yuan)(yuan)(yuan)(yuan)(yuan)極(ji)(ji)(ji)、選(xuan)(xuan)擇(ze)開(kai)關(guan)(guan)mos管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)(de)漏(lou)極(ji)(ji)(ji)相(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)連(lian)，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容的(de)(de)(de)(de)一(yi)端(duan)(duan)與電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容開(kai)關(guan)(guan)mos管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)(de)漏(lou)極(ji)(ji)(ji)相(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)連(lian)，另(ling)一(yi)端(duan)(duan)接(jie)地(di)，選(xuan)(xuan)擇(ze)開(kai)關(guan)(guan)mos管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)(de)柵(zha)(zha)極(ji)(ji)(ji)連(lian)接(jie)像(xiang)(xiang)素(su)(su)選(xuan)(xuan)擇(ze)信(xin)(xin)號(hao)，兩個(ge)(ge)(ge)(ge)光(guang)(guang)(guang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)開(kai)關(guan)(guan)mos管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)(de)柵(zha)(zha)極(ji)(ji)(ji)相(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)連(lian)，并(bing)連(lian)接(jie)光(guang)(guang)(guang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)開(kai)關(guan)(guan)選(xuan)(xuan)擇(ze)信(xin)(xin)號(hao)，兩個(ge)(ge)(ge)(ge)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容開(kai)關(guan)(guan)mos管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)(de)柵(zha)(zha)極(ji)(ji)(ji)相(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)連(lian)，并(bing)連(lian)接(jie)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容選(xuan)(xuan)擇(ze)信(xin)(xin)號(hao)，復(fu)(fu)位(wei)mos管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)(de)源(yuan)(yuan)(yuan)(yuan)(yuan)極(ji)(ji)(ji)和(he)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)(yuan)(yuan)正極(ji)(ji)(ji)相(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)連(lian)，漏(lou)極(ji)(ji)(ji)和(he)兩個(ge)(ge)(ge)(ge)選(xuan)(xuan)擇(ze)開(kai)關(guan)(guan)mos管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)(de)源(yuan)(yuan)(yuan)(yuan)(yuan)極(ji)(ji)(ji)相(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)連(lian)，柵(zha)(zha)極(ji)(ji)(ji)與一(yi)個(ge)(ge)(ge)(ge)復(fu)(fu)位(wei)信(xin)(xin)號(hao)相(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)連(lian)，輸(shu)(shu)(shu)出mos管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)(de)柵(zha)(zha)極(ji)(ji)(ji)與復(fu)(fu)位(wei)mos管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)(de)漏(lou)極(ji)(ji)(ji)、兩個(ge)(ge)(ge)(ge)選(xuan)(xuan)擇(ze)開(kai)關(guan)(guan)mos管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)(de)源(yuan)(yuan)(yuan)(yuan)(yuan)極(ji)(ji)(ji)相(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)連(lian)，輸(shu)(shu)(shu)出mos管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)(de)源(yuan)(yuan)(yuan)(yuan)(yuan)極(ji)(ji)(ji)和(he)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)(yuan)(yuan)正極(ji)(ji)(ji)相(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)連(lian)，漏(lou)極(ji)(ji)(ji)和(he)偏置mos管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)(de)源(yuan)(yuan)(yuan)(yuan)(yuan)極(ji)(ji)(ji)相(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)連(lian)，并(bing)作為像(xiang)(xiang)素(su)(su)的(de)(de)(de)(de)信(xin)(xin)號(hao)輸(shu)(shu)(shu)出端(duan)(duan)，偏置mos管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)(de)漏(lou)極(ji)(ji)(ji)接(jie)地(di)，柵(zha)(zha)極(ji)(ji)(ji)與一(yi)個(ge)(ge)(ge)(ge)偏置電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓相(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)連(lian)。

優選地，兩個所述光電二極管相隔離，各(ge)自(zi)實現光電轉(zhuan)化。

優選地，所述mos管為nmos管。

優選地，兩個(ge)光(guang)電開關mos管(guan)(guan)的(de)尺(chi)寸相同，兩個(ge)電容開關mos管(guan)(guan)的(de)尺(chi)寸相同，兩個(ge)電容的(de)尺(chi)寸相同，兩個(ge)選擇開關mos管(guan)(guan)的(de)尺(chi)寸相同。

一種上述高靈敏度的相位檢(jian)測像素單元的驅動方(fang)法(fa)，包括以下步(bu)驟：

步驟1：將兩個(ge)光電(dian)開(kai)關(guan)mos管、兩個(ge)選擇開(kai)關(guan)mos管和復(fu)位(wei)mos管、輸出mos管打(da)開(kai)，將兩個(ge)電(dian)容開(kai)關(guan)mos管關(guan)斷，使(shi)光電(dian)二極(ji)管復(fu)位(wei)；

步驟2：保持兩個(ge)電容開關mos管(guan)關斷，并(bing)將兩個(ge)光電開關mos管(guan)、兩個(ge)選擇開關mos管(guan)和復位mos管(guan)、輸出mos管(guan)關斷，使光電二極管(guan)曝光，并(bing)積累電荷(he)；

步驟(zou)3：將(jiang)復位mos管(guan)(guan)、輸出mos管(guan)(guan)關斷，將(jiang)兩個(ge)光(guang)電(dian)(dian)(dian)開(kai)關mos管(guan)(guan)、兩個(ge)電(dian)(dian)(dian)容(rong)開(kai)關mos管(guan)(guan)打開(kai)，停止電(dian)(dian)(dian)荷(he)積累，將(jiang)兩個(ge)光(guang)電(dian)(dian)(dian)二極管(guan)(guan)積累的(de)電(dian)(dian)(dian)荷(he)分(fen)別轉移(yi)到兩個(ge)光(guang)電(dian)(dian)(dian)開(kai)關mos管(guan)(guan)的(de)漏極，并將(jiang)電(dian)(dian)(dian)信號進一步存(cun)儲(chu)在兩個(ge)電(dian)(dian)(dian)容(rong)中；

步驟(zou)4：將兩個光(guang)電(dian)開(kai)關(guan)(guan)mos管關(guan)(guan)斷，保持(chi)兩個電(dian)容(rong)(rong)開(kai)關(guan)(guan)mos管導通(tong)，將偏置mos管和其中一個選擇開(kai)關(guan)(guan)mos管打開(kai)，輸出對應相位保持(chi)子單元中電(dian)容(rong)(rong)上存儲的電(dian)信號；

步驟5：將打開的上述其中(zhong)一(yi)(yi)個選擇開關mos管(guan)關斷，并將另一(yi)(yi)個選擇開關mos管(guan)打開，以輸出(chu)另一(yi)(yi)個相位保持(chi)子單元中(zhong)電容上存儲的電信號；

步驟6：將打開(kai)的另一(yi)個選擇(ze)開(kai)關(guan)mos管(guan)關(guan)斷，并關(guan)斷電(dian)容開(kai)關(guan)mos管(guan)和偏置mos管(guan)，準備下一(yi)幀信號的讀取。

優選(xuan)(xuan)(xuan)(xuan)地，步驟(zou)1中(zhong)，使(shi)復位信(xin)(xin)(xin)(xin)(xin)號(hao)、光(guang)電(dian)(dian)(dian)(dian)(dian)開(kai)(kai)關選(xuan)(xuan)(xuan)(xuan)擇(ze)(ze)(ze)信(xin)(xin)(xin)(xin)(xin)號(hao)、兩個(ge)(ge)像(xiang)素(su)(su)選(xuan)(xuan)(xuan)(xuan)擇(ze)(ze)(ze)信(xin)(xin)(xin)(xin)(xin)號(hao)均為高(gao)(gao)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)；步驟(zou)2中(zhong)，使(shi)復位信(xin)(xin)(xin)(xin)(xin)號(hao)、光(guang)電(dian)(dian)(dian)(dian)(dian)開(kai)(kai)關選(xuan)(xuan)(xuan)(xuan)擇(ze)(ze)(ze)信(xin)(xin)(xin)(xin)(xin)號(hao)、兩個(ge)(ge)像(xiang)素(su)(su)選(xuan)(xuan)(xuan)(xuan)擇(ze)(ze)(ze)信(xin)(xin)(xin)(xin)(xin)號(hao)均由(you)(you)高(gao)(gao)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)變(bian)(bian)為低(di)(di)(di)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)；步驟(zou)3中(zhong)，使(shi)光(guang)電(dian)(dian)(dian)(dian)(dian)開(kai)(kai)關選(xuan)(xuan)(xuan)(xuan)擇(ze)(ze)(ze)信(xin)(xin)(xin)(xin)(xin)號(hao)由(you)(you)低(di)(di)(di)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)變(bian)(bian)為高(gao)(gao)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)，電(dian)(dian)(dian)(dian)(dian)容選(xuan)(xuan)(xuan)(xuan)擇(ze)(ze)(ze)信(xin)(xin)(xin)(xin)(xin)號(hao)由(you)(you)低(di)(di)(di)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)變(bian)(bian)為高(gao)(gao)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)；步驟(zou)4中(zhong)，使(shi)光(guang)電(dian)(dian)(dian)(dian)(dian)開(kai)(kai)關選(xuan)(xuan)(xuan)(xuan)擇(ze)(ze)(ze)信(xin)(xin)(xin)(xin)(xin)號(hao)由(you)(you)高(gao)(gao)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)變(bian)(bian)為低(di)(di)(di)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)，偏置(zhi)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)由(you)(you)低(di)(di)(di)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)變(bian)(bian)為高(gao)(gao)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)，其中(zhong)一個(ge)(ge)像(xiang)素(su)(su)選(xuan)(xuan)(xuan)(xuan)擇(ze)(ze)(ze)信(xin)(xin)(xin)(xin)(xin)號(hao)由(you)(you)低(di)(di)(di)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)變(bian)(bian)為高(gao)(gao)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)；步驟(zou)5中(zhong)，使(shi)其中(zhong)一個(ge)(ge)像(xiang)素(su)(su)選(xuan)(xuan)(xuan)(xuan)擇(ze)(ze)(ze)信(xin)(xin)(xin)(xin)(xin)號(hao)由(you)(you)高(gao)(gao)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)變(bian)(bian)為低(di)(di)(di)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)，另一個(ge)(ge)像(xiang)素(su)(su)選(xuan)(xuan)(xuan)(xuan)擇(ze)(ze)(ze)信(xin)(xin)(xin)(xin)(xin)號(hao)由(you)(you)低(di)(di)(di)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)變(bian)(bian)為高(gao)(gao)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)；步驟(zou)6中(zhong)，使(shi)另一個(ge)(ge)像(xiang)素(su)(su)選(xuan)(xuan)(xuan)(xuan)擇(ze)(ze)(ze)信(xin)(xin)(xin)(xin)(xin)號(hao)由(you)(you)高(gao)(gao)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)變(bian)(bian)為低(di)(di)(di)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)，偏置(zhi)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)、電(dian)(dian)(dian)(dian)(dian)容選(xuan)(xuan)(xuan)(xuan)擇(ze)(ze)(ze)信(xin)(xin)(xin)(xin)(xin)號(hao)由(you)(you)高(gao)(gao)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)變(bian)(bian)為低(di)(di)(di)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)。

從上述技術方案可以看(kan)出(chu)(chu)，本(ben)發明通過(guo)使(shi)相位檢測像素(su)兩個(ge)感光單(dan)(dan)元(yuan)共(gong)用由(you)信(xin)號采樣保持(chi)單(dan)(dan)元(yuan)、信(xin)號復位輸出(chu)(chu)單(dan)(dan)元(yuan)組(zu)成的(de)(de)一個(ge)讀出(chu)(chu)電(dian)路(lu)，不僅(jin)在曝光之后能夠讀出(chu)(chu)相位檢測像素(su)單(dan)(dan)元(yuan)的(de)(de)信(xin)號，而(er)且通過(guo)使(shi)兩個(ge)感光單(dan)(dan)元(yuan)轉化得到(dao)的(de)(de)電(dian)信(xin)號共(gong)用一個(ge)讀出(chu)(chu)電(dian)路(lu)，避免了工藝偏(pian)差(cha)(cha)所導致的(de)(de)兩個(ge)電(dian)信(xin)號的(de)(de)噪(zao)聲(sheng)差(cha)(cha)異，從而(er)提高了相位差(cha)(cha)檢測時(shi)的(de)(de)靈敏(min)度。

附圖說明

圖(tu)1是本(ben)發明一較佳實施例的一種(zhong)高靈敏(min)度的相(xiang)位檢(jian)測像素單元電路結構示意圖(tu)；

圖(tu)2-圖(tu)3是(shi)本發明一較佳實(shi)施例的一種相位檢測像素(su)結構及(ji)其受(shou)不同方向(xiang)入射光照(zhao)射時的狀態示意圖(tu)；

圖4是本發明相位檢測像素中兩個(ge)光電二極(ji)管產(chan)生的電信(xin)號大小隨入射(she)光入射(she)角變化的曲線圖；

圖(tu)5是本發明一(yi)較佳(jia)實(shi)施(shi)例的高靈敏度的相(xiang)位(wei)檢測像素(su)單元(yuan)的驅動方法時序(xu)圖(tu)。

具體實施方式

下面(mian)結合附圖(tu)，對本發明(ming)的具體(ti)實施(shi)方(fang)式(shi)作進一步的詳細(xi)說明(ming)。

需要說(shuo)明(ming)的是，在下(xia)述(shu)的具體實(shi)施方(fang)式(shi)中(zhong)，在詳(xiang)述(shu)本(ben)發(fa)明(ming)的實(shi)施方(fang)式(shi)時，為(wei)了清楚地表示(shi)本(ben)發(fa)明(ming)的結(jie)(jie)構以(yi)(yi)便(bian)于說(shuo)明(ming)，特對附圖中(zhong)的結(jie)(jie)構不(bu)依照一般(ban)比例繪圖，并進行(xing)了局(ju)部放大(da)、變形及簡化處理，因此(ci)，應避免以(yi)(yi)此(ci)作為(wei)對本(ben)發(fa)明(ming)的限定(ding)來加以(yi)(yi)理解。

在(zai)以下本發(fa)(fa)(fa)明(ming)的(de)(de)(de)(de)具體(ti)實施(shi)方式中，請參閱圖(tu)(tu)1，圖(tu)(tu)1是本發(fa)(fa)(fa)明(ming)一(yi)(yi)(yi)較佳實施(shi)例的(de)(de)(de)(de)一(yi)(yi)(yi)種高(gao)靈(ling)敏(min)度(du)的(de)(de)(de)(de)相(xiang)位(wei)檢(jian)測像(xiang)素(su)單(dan)(dan)(dan)元(yuan)(yuan)電路(lu)結(jie)構示(shi)(shi)意(yi)圖(tu)(tu)。如(ru)圖(tu)(tu)1所(suo)示(shi)(shi)，本發(fa)(fa)(fa)明(ming)的(de)(de)(de)(de)一(yi)(yi)(yi)種高(gao)靈(ling)敏(min)度(du)的(de)(de)(de)(de)相(xiang)位(wei)檢(jian)測像(xiang)素(su)單(dan)(dan)(dan)元(yuan)(yuan)，包(bao)括(kuo)：一(yi)(yi)(yi)個相(xiang)位(wei)檢(jian)測像(xiang)素(su)10，一(yi)(yi)(yi)個信(xin)(xin)號(hao)(hao)采樣保(bao)(bao)持單(dan)(dan)(dan)元(yuan)(yuan)20，一(yi)(yi)(yi)個信(xin)(xin)號(hao)(hao)復(fu)位(wei)輸(shu)出單(dan)(dan)(dan)元(yuan)(yuan)30(如(ru)圖(tu)(tu)中三個虛線框內的(de)(de)(de)(de)電路(lu)結(jie)構所(suo)指)。相(xiang)位(wei)檢(jian)測像(xiang)素(su)10包(bao)括(kuo)兩(liang)個并(bing)列設置的(de)(de)(de)(de)感(gan)光(guang)(guang)單(dan)(dan)(dan)元(yuan)(yuan)(即(ji)pd1和(he)pd2)，用于分別將(jiang)入(ru)(ru)射(she)光(guang)(guang)照射(she)時各自接受的(de)(de)(de)(de)光(guang)(guang)信(xin)(xin)號(hao)(hao)轉化(hua)為電信(xin)(xin)號(hao)(hao)，并(bing)隨入(ru)(ru)射(she)光(guang)(guang)角度(du)的(de)(de)(de)(de)變化(hua)，產生相(xiang)位(wei)差。信(xin)(xin)號(hao)(hao)采樣保(bao)(bao)持單(dan)(dan)(dan)元(yuan)(yuan)20包(bao)括(kuo)兩(liang)個完(wan)全相(xiang)同的(de)(de)(de)(de)相(xiang)位(wei)保(bao)(bao)持子單(dan)(dan)(dan)元(yuan)(yuan)21、22，兩(liang)個相(xiang)位(wei)保(bao)(bao)持子單(dan)(dan)(dan)元(yuan)(yuan)21、22的(de)(de)(de)(de)輸(shu)入(ru)(ru)端(duan)分別與兩(liang)個感(gan)光(guang)(guang)單(dan)(dan)(dan)元(yuan)(yuan)的(de)(de)(de)(de)輸(shu)出端(duan)相(xiang)連，用于傳輸(shu)和(he)儲存兩(liang)個感(gan)光(guang)(guang)單(dan)(dan)(dan)元(yuan)(yuan)產生的(de)(de)(de)(de)電信(xin)(xin)號(hao)(hao)。信(xin)(xin)號(hao)(hao)復(fu)位(wei)輸(shu)出單(dan)(dan)(dan)元(yuan)(yuan)30的(de)(de)(de)(de)輸(shu)入(ru)(ru)端(duan)與兩(liang)個相(xiang)位(wei)保(bao)(bao)持子單(dan)(dan)(dan)元(yuan)(yuan)21、22分別的(de)(de)(de)(de)輸(shu)出端(duan)同時相(xiang)連，用于對(dui)電路(lu)復(fu)位(wei)和(he)輸(shu)出電信(xin)(xin)號(hao)(hao)。

請(qing)參閱圖(tu)(tu)(tu)2-圖(tu)(tu)(tu)3，圖(tu)(tu)(tu)2-圖(tu)(tu)(tu)3是本(ben)發(fa)明一(yi)較佳(jia)實施例的一(yi)種相(xiang)位檢測像素(su)結構及其受不(bu)同方(fang)向入(ru)射(she)光(guang)(guang)照射(she)時的狀態示(shi)意圖(tu)(tu)(tu)。如(ru)圖(tu)(tu)(tu)2-圖(tu)(tu)(tu)3所示(shi)，兩個(ge)(ge)感光(guang)(guang)單元可(ke)采用(yong)例如(ru)兩個(ge)(ge)光(guang)(guang)電(dian)二極(ji)管(pd1和pd2)11和12制作。兩個(ge)(ge)光(guang)(guang)電(dian)二極(ji)管11和12在其上方(fang)可(ke)共(gong)用(yong)一(yi)個(ge)(ge)顯微鏡(jing)頭14和共(gong)用(yong)一(yi)個(ge)(ge)濾光(guang)(guang)片13。當光(guang)(guang)照射(she)在顯微鏡(jing)頭14上時，兩個(ge)(ge)光(guang)(guang)電(dian)二極(ji)管11、12可(ke)分別將各自接(jie)受的光(guang)(guang)信號轉化為電(dian)信號；為此，這兩個(ge)(ge)光(guang)(guang)電(dian)二極(ji)管11和12在制作工藝上相(xiang)隔(ge)離，各自實現光(guang)(guang)電(dian)轉化且相(xiang)互不(bu)受影響。

在一定光(guang)(guang)(guang)(guang)(guang)強下，兩(liang)個(ge)光(guang)(guang)(guang)(guang)(guang)電(dian)(dian)二(er)(er)極(ji)(ji)(ji)管(guan)(guan)11和(he)12轉化(hua)得到(dao)(dao)的(de)(de)(de)電(dian)(dian)信號(hao)(hao)(hao)的(de)(de)(de)大(da)(da)小(xiao)將受到(dao)(dao)入(ru)射(she)(she)(she)(she)光(guang)(guang)(guang)(guang)(guang)角(jiao)度的(de)(de)(de)影響。如(ru)果定義圖(tu)(tu)(tu)2所(suo)(suo)示的(de)(de)(de)入(ru)射(she)(she)(she)(she)光(guang)(guang)(guang)(guang)(guang)的(de)(de)(de)入(ru)射(she)(she)(she)(she)角(jiao)15為正角(jiao)、圖(tu)(tu)(tu)3所(suo)(suo)示的(de)(de)(de)入(ru)射(she)(she)(she)(she)光(guang)(guang)(guang)(guang)(guang)的(de)(de)(de)入(ru)射(she)(she)(she)(she)角(jiao)16為負角(jiao)，則兩(liang)個(ge)光(guang)(guang)(guang)(guang)(guang)電(dian)(dian)二(er)(er)極(ji)(ji)(ji)管(guan)(guan)pd1和(he)pd2產(chan)(chan)生(sheng)(sheng)(sheng)(sheng)的(de)(de)(de)電(dian)(dian)信號(hao)(hao)(hao)大(da)(da)小(xiao)將隨入(ru)射(she)(she)(she)(she)角(jiao)的(de)(de)(de)正負以(yi)(yi)及大(da)(da)小(xiao)變化(hua)，產(chan)(chan)生(sheng)(sheng)(sheng)(sheng)相(xiang)(xiang)位(wei)差。其(qi)中，當入(ru)射(she)(she)(she)(she)光(guang)(guang)(guang)(guang)(guang)直(zhi)射(she)(she)(she)(she)到(dao)(dao)顯(xian)微鏡(jing)頭時(shi)，兩(liang)個(ge)光(guang)(guang)(guang)(guang)(guang)電(dian)(dian)二(er)(er)極(ji)(ji)(ji)管(guan)(guan)產(chan)(chan)生(sheng)(sheng)(sheng)(sheng)的(de)(de)(de)電(dian)(dian)信號(hao)(hao)(hao)大(da)(da)小(xiao)相(xiang)(xiang)同(tong)(即相(xiang)(xiang)位(wei)差為零)，當入(ru)射(she)(she)(she)(she)光(guang)(guang)(guang)(guang)(guang)如(ru)圖(tu)(tu)(tu)2-圖(tu)(tu)(tu)3所(suo)(suo)示斜射(she)(she)(she)(she)到(dao)(dao)顯(xian)微鏡(jing)頭時(shi)，兩(liang)個(ge)光(guang)(guang)(guang)(guang)(guang)電(dian)(dian)二(er)(er)極(ji)(ji)(ji)管(guan)(guan)產(chan)(chan)生(sheng)(sheng)(sheng)(sheng)的(de)(de)(de)電(dian)(dian)信號(hao)(hao)(hao)大(da)(da)小(xiao)不同(tong)，從(cong)而產(chan)(chan)生(sheng)(sheng)(sheng)(sheng)相(xiang)(xiang)位(wei)差。圖(tu)(tu)(tu)4顯(xian)示相(xiang)(xiang)位(wei)檢(jian)測像素中兩(liang)個(ge)光(guang)(guang)(guang)(guang)(guang)電(dian)(dian)二(er)(er)極(ji)(ji)(ji)管(guan)(guan)產(chan)(chan)生(sheng)(sheng)(sheng)(sheng)的(de)(de)(de)電(dian)(dian)信號(hao)(hao)(hao)大(da)(da)小(xiao)隨入(ru)射(she)(she)(she)(she)光(guang)(guang)(guang)(guang)(guang)入(ru)射(she)(she)(she)(she)角(jiao)變化(hua)的(de)(de)(de)曲(qu)線(xian)(xian)(xian)圖(tu)(tu)(tu)，圖(tu)(tu)(tu)中曲(qu)線(xian)(xian)(xian)17、曲(qu)線(xian)(xian)(xian)18分(fen)別是光(guang)(guang)(guang)(guang)(guang)電(dian)(dian)二(er)(er)極(ji)(ji)(ji)管(guan)(guan)pd2、pd1各自所(suo)(suo)產(chan)(chan)生(sheng)(sheng)(sheng)(sheng)的(de)(de)(de)電(dian)(dian)信號(hao)(hao)(hao)曲(qu)線(xian)(xian)(xian)。其(qi)中，當入(ru)射(she)(she)(she)(she)光(guang)(guang)(guang)(guang)(guang)直(zhi)射(she)(she)(she)(she)到(dao)(dao)顯(xian)微鏡(jing)頭、即入(ru)射(she)(she)(she)(she)角(jiao)為0時(shi)，曲(qu)線(xian)(xian)(xian)17、曲(qu)線(xian)(xian)(xian)18相(xiang)(xiang)交，表(biao)(biao)明兩(liang)個(ge)光(guang)(guang)(guang)(guang)(guang)電(dian)(dian)二(er)(er)極(ji)(ji)(ji)管(guan)(guan)產(chan)(chan)生(sheng)(sheng)(sheng)(sheng)的(de)(de)(de)電(dian)(dian)信號(hao)(hao)(hao)大(da)(da)小(xiao)相(xiang)(xiang)同(tong)，相(xiang)(xiang)位(wei)差為零，此(ci)時(shi)即處于聚焦狀態；當入(ru)射(she)(she)(she)(she)光(guang)(guang)(guang)(guang)(guang)以(yi)(yi)正角(jiao)或負角(jiao)方式斜射(she)(she)(she)(she)到(dao)(dao)顯(xian)微鏡(jing)頭時(shi)，曲(qu)線(xian)(xian)(xian)17、曲(qu)線(xian)(xian)(xian)18分(fen)離，表(biao)(biao)明兩(liang)個(ge)光(guang)(guang)(guang)(guang)(guang)電(dian)(dian)二(er)(er)極(ji)(ji)(ji)管(guan)(guan)產(chan)(chan)生(sheng)(sheng)(sheng)(sheng)的(de)(de)(de)電(dian)(dian)信號(hao)(hao)(hao)大(da)(da)小(xiao)不同(tong)，從(cong)而產(chan)(chan)生(sheng)(sheng)(sheng)(sheng)相(xiang)(xiang)位(wei)差，此(ci)時(shi)即處于離焦狀態。

請繼(ji)續參閱圖1。信號(hao)采樣(yang)(yang)保(bao)持(chi)單(dan)(dan)(dan)元(yuan)(即信號(hao)采樣(yang)(yang)保(bao)持(chi)電(dian)(dian)路)20的(de)每個(ge)(ge)相位(wei)(wei)保(bao)持(chi)子(zi)單(dan)(dan)(dan)元(yuan)(即相位(wei)(wei)保(bao)持(chi)子(zi)電(dian)(dian)路)都同樣(yang)(yang)包括(kuo)一(yi)(yi)(yi)個(ge)(ge)光(guang)電(dian)(dian)開(kai)(kai)關(guan)mos管(guan)(guan)、一(yi)(yi)(yi)個(ge)(ge)電(dian)(dian)容(rong)開(kai)(kai)關(guan)mos管(guan)(guan)、一(yi)(yi)(yi)個(ge)(ge)電(dian)(dian)容(rong)以(yi)及一(yi)(yi)(yi)個(ge)(ge)選(xuan)擇(ze)開(kai)(kai)關(guan)mos管(guan)(guan)；即相位(wei)(wei)保(bao)持(chi)子(zi)單(dan)(dan)(dan)元(yuan)21包括(kuo)一(yi)(yi)(yi)個(ge)(ge)光(guang)電(dian)(dian)開(kai)(kai)關(guan)mos管(guan)(guan)m1、一(yi)(yi)(yi)個(ge)(ge)電(dian)(dian)容(rong)開(kai)(kai)關(guan)mos管(guan)(guan)m2、一(yi)(yi)(yi)個(ge)(ge)電(dian)(dian)容(rong)c1以(yi)及一(yi)(yi)(yi)個(ge)(ge)選(xuan)擇(ze)開(kai)(kai)關(guan)mos管(guan)(guan)m3，相位(wei)(wei)保(bao)持(chi)子(zi)單(dan)(dan)(dan)元(yuan)22也(ye)同樣(yang)(yang)包括(kuo)一(yi)(yi)(yi)個(ge)(ge)光(guang)電(dian)(dian)開(kai)(kai)關(guan)mos管(guan)(guan)m4、一(yi)(yi)(yi)個(ge)(ge)電(dian)(dian)容(rong)開(kai)(kai)關(guan)mos管(guan)(guan)m5、一(yi)(yi)(yi)個(ge)(ge)電(dian)(dian)容(rong)c2以(yi)及一(yi)(yi)(yi)個(ge)(ge)選(xuan)擇(ze)開(kai)(kai)關(guan)mos管(guan)(guan)m6。這樣(yang)(yang)，信號(hao)采樣(yang)(yang)保(bao)持(chi)單(dan)(dan)(dan)元(yuan)20就一(yi)(yi)(yi)共包括(kuo)兩(liang)(liang)個(ge)(ge)光(guang)電(dian)(dian)開(kai)(kai)關(guan)mos管(guan)(guan)m1和m4、兩(liang)(liang)個(ge)(ge)電(dian)(dian)容(rong)開(kai)(kai)關(guan)mos管(guan)(guan)m2和m5、兩(liang)(liang)個(ge)(ge)電(dian)(dian)容(rong)c1和c2以(yi)及兩(liang)(liang)個(ge)(ge)選(xuan)擇(ze)開(kai)(kai)關(guan)mos管(guan)(guan)m3和m6。

兩個(ge)光電二極管pd1和(he)pd2的(de)陽極分別與電源負極vss相連(lian)。

每個(ge)相(xiang)位保(bao)持(chi)子(zi)單元(yuan)中的(de)(de)(de)(de)(de)光(guang)(guang)(guang)(guang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)開(kai)(kai)(kai)(kai)(kai)關(guan)(guan)(guan)mos管(guan)(guan)(guan)(guan)(guan)各自對(dui)(dui)應(ying)一(yi)(yi)(yi)個(ge)光(guang)(guang)(guang)(guang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)二極(ji)(ji)(ji)(ji)管(guan)(guan)(guan)(guan)(guan)，以控制對(dui)(dui)應(ying)的(de)(de)(de)(de)(de)光(guang)(guang)(guang)(guang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)二極(ji)(ji)(ji)(ji)管(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)信號(hao)的(de)(de)(de)(de)(de)傳(chuan)輸(shu)；兩個(ge)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)開(kai)(kai)(kai)(kai)(kai)關(guan)(guan)(guan)mos管(guan)(guan)(guan)(guan)(guan)分別對(dui)(dui)應(ying)一(yi)(yi)(yi)個(ge)光(guang)(guang)(guang)(guang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)開(kai)(kai)(kai)(kai)(kai)關(guan)(guan)(guan)mos管(guan)(guan)(guan)(guan)(guan)和(he)一(yi)(yi)(yi)個(ge)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)，控制電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)的(de)(de)(de)(de)(de)充放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)；兩個(ge)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)用于存儲光(guang)(guang)(guang)(guang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)二極(ji)(ji)(ji)(ji)管(guan)(guan)(guan)(guan)(guan)轉(zhuan)化的(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)荷，實現電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)信號(hao)的(de)(de)(de)(de)(de)保(bao)持(chi)；兩個(ge)選(xuan)擇(ze)(ze)(ze)開(kai)(kai)(kai)(kai)(kai)關(guan)(guan)(guan)mos管(guan)(guan)(guan)(guan)(guan)用于選(xuan)擇(ze)(ze)(ze)對(dui)(dui)應(ying)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)上存儲的(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)信號(hao)的(de)(de)(de)(de)(de)傳(chuan)輸(shu)。這(zhe)樣，每個(ge)相(xiang)位保(bao)持(chi)子(zi)單元(yuan)就可(ke)實現對(dui)(dui)應(ying)光(guang)(guang)(guang)(guang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)二極(ji)(ji)(ji)(ji)管(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)信號(hao)采樣。其中，光(guang)(guang)(guang)(guang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)開(kai)(kai)(kai)(kai)(kai)關(guan)(guan)(guan)mos管(guan)(guan)(guan)(guan)(guan)m1的(de)(de)(de)(de)(de)源(yuan)(yuan)(yuan)極(ji)(ji)(ji)(ji)和(he)光(guang)(guang)(guang)(guang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)二極(ji)(ji)(ji)(ji)管(guan)(guan)(guan)(guan)(guan)pd1的(de)(de)(de)(de)(de)陰極(ji)(ji)(ji)(ji)對(dui)(dui)應(ying)相(xiang)連，光(guang)(guang)(guang)(guang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)開(kai)(kai)(kai)(kai)(kai)關(guan)(guan)(guan)mos管(guan)(guan)(guan)(guan)(guan)m1的(de)(de)(de)(de)(de)漏(lou)極(ji)(ji)(ji)(ji)和(he)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)開(kai)(kai)(kai)(kai)(kai)關(guan)(guan)(guan)mos管(guan)(guan)(guan)(guan)(guan)m2的(de)(de)(de)(de)(de)漏(lou)極(ji)(ji)(ji)(ji)、選(xuan)擇(ze)(ze)(ze)開(kai)(kai)(kai)(kai)(kai)關(guan)(guan)(guan)mos管(guan)(guan)(guan)(guan)(guan)m3的(de)(de)(de)(de)(de)源(yuan)(yuan)(yuan)極(ji)(ji)(ji)(ji)相(xiang)連，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)c1的(de)(de)(de)(de)(de)一(yi)(yi)(yi)端與電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)開(kai)(kai)(kai)(kai)(kai)關(guan)(guan)(guan)mos管(guan)(guan)(guan)(guan)(guan)m2的(de)(de)(de)(de)(de)源(yuan)(yuan)(yuan)極(ji)(ji)(ji)(ji)相(xiang)連，另一(yi)(yi)(yi)端與電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)負(fu)極(ji)(ji)(ji)(ji)vss相(xiang)連(即接(jie)(jie)(jie)(jie)地)，選(xuan)擇(ze)(ze)(ze)開(kai)(kai)(kai)(kai)(kai)關(guan)(guan)(guan)mos管(guan)(guan)(guan)(guan)(guan)m3的(de)(de)(de)(de)(de)柵極(ji)(ji)(ji)(ji)連接(jie)(jie)(jie)(jie)像素選(xuan)擇(ze)(ze)(ze)信號(hao)rsel1；光(guang)(guang)(guang)(guang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)開(kai)(kai)(kai)(kai)(kai)關(guan)(guan)(guan)mos管(guan)(guan)(guan)(guan)(guan)m4的(de)(de)(de)(de)(de)源(yuan)(yuan)(yuan)極(ji)(ji)(ji)(ji)和(he)光(guang)(guang)(guang)(guang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)二極(ji)(ji)(ji)(ji)管(guan)(guan)(guan)(guan)(guan)pd2的(de)(de)(de)(de)(de)陰極(ji)(ji)(ji)(ji)對(dui)(dui)應(ying)相(xiang)連，光(guang)(guang)(guang)(guang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)開(kai)(kai)(kai)(kai)(kai)關(guan)(guan)(guan)mos管(guan)(guan)(guan)(guan)(guan)m4的(de)(de)(de)(de)(de)漏(lou)極(ji)(ji)(ji)(ji)和(he)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)開(kai)(kai)(kai)(kai)(kai)關(guan)(guan)(guan)mos管(guan)(guan)(guan)(guan)(guan)m5的(de)(de)(de)(de)(de)漏(lou)極(ji)(ji)(ji)(ji)、選(xuan)擇(ze)(ze)(ze)開(kai)(kai)(kai)(kai)(kai)關(guan)(guan)(guan)mos管(guan)(guan)(guan)(guan)(guan)m6的(de)(de)(de)(de)(de)源(yuan)(yuan)(yuan)極(ji)(ji)(ji)(ji)相(xiang)連，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)c2的(de)(de)(de)(de)(de)一(yi)(yi)(yi)端與電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)開(kai)(kai)(kai)(kai)(kai)關(guan)(guan)(guan)mos管(guan)(guan)(guan)(guan)(guan)m5的(de)(de)(de)(de)(de)源(yuan)(yuan)(yuan)極(ji)(ji)(ji)(ji)相(xiang)連，另一(yi)(yi)(yi)端與電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)負(fu)極(ji)(ji)(ji)(ji)vss相(xiang)連(即接(jie)(jie)(jie)(jie)地)，選(xuan)擇(ze)(ze)(ze)開(kai)(kai)(kai)(kai)(kai)關(guan)(guan)(guan)mos管(guan)(guan)(guan)(guan)(guan)m6的(de)(de)(de)(de)(de)柵極(ji)(ji)(ji)(ji)連接(jie)(jie)(jie)(jie)像素選(xuan)擇(ze)(ze)(ze)信號(hao)rsel2。

兩個光電開(kai)關mos管(guan)m1和(he)m4的(de)柵極(ji)相連(lian)在(zai)一(yi)起(qi)，并連(lian)接至光電開(kai)關選(xuan)擇信號tx；兩個電容開(kai)關mos管(guan)m2和(he)m5的(de)柵極(ji)相連(lian)在(zai)一(yi)起(qi)，并連(lian)接至電容選(xuan)擇信號csel。

請(qing)參(can)閱(yue)圖1。信(xin)(xin)號(hao)(hao)復(fu)(fu)位(wei)輸(shu)(shu)(shu)(shu)出(chu)(chu)(chu)(chu)單元30包括一(yi)個復(fu)(fu)位(wei)mos管(guan)(guan)(guan)(guan)m7和(he)(he)一(yi)個級(ji)(ji)信(xin)(xin)號(hao)(hao)輸(shu)(shu)(shu)(shu)出(chu)(chu)(chu)(chu)電(dian)路(lu)；級(ji)(ji)信(xin)(xin)號(hao)(hao)輸(shu)(shu)(shu)(shu)出(chu)(chu)(chu)(chu)電(dian)路(lu)又包括一(yi)個輸(shu)(shu)(shu)(shu)出(chu)(chu)(chu)(chu)mos管(guan)(guan)(guan)(guan)m8和(he)(he)一(yi)個偏(pian)(pian)置(zhi)mos管(guan)(guan)(guan)(guan)m9。復(fu)(fu)位(wei)mos管(guan)(guan)(guan)(guan)m7的漏極(ji)(ji)(ji)和(he)(he)電(dian)源(yuan)正(zheng)極(ji)(ji)(ji)vdd相連，源(yuan)極(ji)(ji)(ji)和(he)(he)兩個選擇(ze)開關mos管(guan)(guan)(guan)(guan)m3和(he)(he)m6的漏極(ji)(ji)(ji)相連，柵極(ji)(ji)(ji)連接(jie)至(zhi)復(fu)(fu)位(wei)信(xin)(xin)號(hao)(hao)rst，用于(yu)對電(dian)路(lu)信(xin)(xin)號(hao)(hao)復(fu)(fu)位(wei)。輸(shu)(shu)(shu)(shu)出(chu)(chu)(chu)(chu)mos管(guan)(guan)(guan)(guan)m8的柵極(ji)(ji)(ji)與復(fu)(fu)位(wei)mos管(guan)(guan)(guan)(guan)m7的源(yuan)極(ji)(ji)(ji)、兩個選擇(ze)開關mos管(guan)(guan)(guan)(guan)m3和(he)(he)m6的漏極(ji)(ji)(ji)相連，輸(shu)(shu)(shu)(shu)出(chu)(chu)(chu)(chu)mos管(guan)(guan)(guan)(guan)m8的漏極(ji)(ji)(ji)和(he)(he)電(dian)源(yuan)正(zheng)極(ji)(ji)(ji)vdd相連，源(yuan)極(ji)(ji)(ji)和(he)(he)偏(pian)(pian)置(zhi)mos管(guan)(guan)(guan)(guan)m9的漏極(ji)(ji)(ji)相連，并作為像素(su)的信(xin)(xin)號(hao)(hao)輸(shu)(shu)(shu)(shu)出(chu)(chu)(chu)(chu)端(duan)pixel＿out；這樣，由輸(shu)(shu)(shu)(shu)出(chu)(chu)(chu)(chu)mos管(guan)(guan)(guan)(guan)m8和(he)(he)偏(pian)(pian)置(zhi)mos管(guan)(guan)(guan)(guan)m9組成(cheng)的輸(shu)(shu)(shu)(shu)出(chu)(chu)(chu)(chu)級(ji)(ji)就(jiu)可(ke)將電(dian)信(xin)(xin)號(hao)(hao)輸(shu)(shu)(shu)(shu)出(chu)(chu)(chu)(chu)。偏(pian)(pian)置(zhi)mos管(guan)(guan)(guan)(guan)m9的源(yuan)極(ji)(ji)(ji)接(jie)地(即與電(dian)源(yuan)負極(ji)(ji)(ji)vss相連)，柵極(ji)(ji)(ji)連接(jie)至(zhi)偏(pian)(pian)置(zhi)電(dian)壓bias，用于(yu)提供偏(pian)(pian)置(zhi)電(dian)流。

上述(shu)信號采樣(yang)保持單(dan)元和(he)信號復位(wei)輸(shu)出單(dan)元中的各mos管(guan)的源極和(he)漏(lou)極可以互換(huan)，這不會(hui)影響電路功能。并且，各所(suo)述(shu)mos管(guan)可以采用nmos管(guan)。

為了(le)避免兩(liang)個(ge)(ge)光電(dian)二(er)極管(guan)轉化得到的兩(liang)個(ge)(ge)電(dian)信號的噪聲差(cha)異，進一步提高相位差(cha)檢測的靈敏度，可(ke)使(shi)得兩(liang)個(ge)(ge)光電(dian)開關mos管(guan)m1和m4的尺寸相同(tong)(tong)，兩(liang)個(ge)(ge)電(dian)容(rong)開關mos管(guan)m2和m5的尺寸相同(tong)(tong)，兩(liang)個(ge)(ge)電(dian)容(rong)c1和c2的尺寸相同(tong)(tong)，以(yi)及兩(liang)個(ge)(ge)選擇開關mos管(guan)m3和m6的尺寸相同(tong)(tong)。

下面結合(he)具(ju)體實施(shi)方式，對本發明的(de)上述高(gao)靈敏度的(de)相(xiang)位檢測像(xiang)素(su)單元的(de)驅動方法進行詳細(xi)說明。

請參閱圖5，圖5是本發明一(yi)較(jiao)佳實施例的(de)高靈(ling)敏(min)度的(de)相位(wei)檢測像素單元的(de)驅(qu)動(dong)方法時序圖。如圖5所示，本發明的(de)一(yi)種上述高靈(ling)敏(min)度的(de)相位(wei)檢測像素單元的(de)驅(qu)動(dong)方法，包括以下步驟：

步驟1：使(shi)復位信號(hao)rst、光電(dian)(dian)(dian)開(kai)關(guan)(guan)選擇(ze)信號(hao)tx、兩(liang)(liang)個(ge)(ge)像素選擇(ze)信號(hao)rsel1和(he)(he)rsel2均(jun)置(zhi)為高電(dian)(dian)(dian)壓，將(jiang)兩(liang)(liang)個(ge)(ge)光電(dian)(dian)(dian)開(kai)關(guan)(guan)mos管(guan)(guan)(guan)m1和(he)(he)m4、兩(liang)(liang)個(ge)(ge)選擇(ze)開(kai)關(guan)(guan)mos管(guan)(guan)(guan)m3和(he)(he)m6以(yi)及(ji)復位mos管(guan)(guan)(guan)m7、輸出(chu)mos管(guan)(guan)(guan)m8打開(kai)，使(shi)其導通(tong)，并將(jiang)兩(liang)(liang)個(ge)(ge)電(dian)(dian)(dian)容(rong)開(kai)關(guan)(guan)mos管(guan)(guan)(guan)m2和(he)(he)m5以(yi)及(ji)偏置(zhi)mos管(guan)(guan)(guan)m9關(guan)(guan)斷，使(shi)兩(liang)(liang)個(ge)(ge)光電(dian)(dian)(dian)二極管(guan)(guan)(guan)pd1和(he)(he)pd2復位。

步驟2：使(shi)復位(wei)信號(hao)rst、光電(dian)開(kai)關選擇信號(hao)tx、兩個(ge)像(xiang)素選擇信號(hao)rsel1和(he)(he)rsel2均由高(gao)電(dian)壓變為低電(dian)壓，保持兩個(ge)電(dian)容開(kai)關mos管m2和(he)(he)m5關斷，并將兩個(ge)光電(dian)開(kai)關mos管m1和(he)(he)m4、兩個(ge)選擇開(kai)關mos管m3和(he)(he)m6以及(ji)復位(wei)mos管m7、輸出mos管m8、偏置mos管m9都關斷，使(shi)光電(dian)二極管pd1和(he)(he)pd2曝光，并積累(lei)電(dian)荷(he)。

步(bu)驟3：使光(guang)(guang)(guang)電(dian)(dian)開關選擇信(xin)號(hao)tx由低(di)(di)電(dian)(dian)壓(ya)變為(wei)高電(dian)(dian)壓(ya)，電(dian)(dian)容(rong)(rong)選擇信(xin)號(hao)csel由低(di)(di)電(dian)(dian)壓(ya)變為(wei)高電(dian)(dian)壓(ya)，將復位mos管(guan)(guan)m7、輸出mos管(guan)(guan)m8關斷，將兩個(ge)(ge)光(guang)(guang)(guang)電(dian)(dian)開關mos管(guan)(guan)m1和(he)(he)m4、兩個(ge)(ge)電(dian)(dian)容(rong)(rong)開關mos管(guan)(guan)m2和(he)(he)m5打開，停(ting)止(zhi)電(dian)(dian)荷積累，以(yi)將兩個(ge)(ge)光(guang)(guang)(guang)電(dian)(dian)二極管(guan)(guan)pd1和(he)(he)pd2積累的電(dian)(dian)荷分別轉移到兩個(ge)(ge)光(guang)(guang)(guang)電(dian)(dian)開關mos管(guan)(guan)m1和(he)(he)m4的漏(lou)極，并保(bao)持兩個(ge)(ge)光(guang)(guang)(guang)電(dian)(dian)開關mos管(guan)(guan)m1和(he)(he)m4、兩個(ge)(ge)電(dian)(dian)容(rong)(rong)開關mos管(guan)(guan)m2和(he)(he)m5開啟(qi)，從而將光(guang)(guang)(guang)電(dian)(dian)開關mos管(guan)(guan)m1和(he)(he)m4漏(lou)極的電(dian)(dian)信(xin)號(hao)進一步(bu)存儲在(zai)兩個(ge)(ge)電(dian)(dian)容(rong)(rong)c1和(he)(he)c2中。

步驟4：使光電(dian)(dian)開(kai)關(guan)(guan)選(xuan)擇信(xin)號(hao)tx由(you)高電(dian)(dian)壓(ya)(ya)變為低電(dian)(dian)壓(ya)(ya)，將兩個(ge)(ge)(ge)光電(dian)(dian)開(kai)關(guan)(guan)mos管(guan)m1和m4關(guan)(guan)斷，使偏置電(dian)(dian)壓(ya)(ya)bias由(you)低電(dian)(dian)壓(ya)(ya)變為高電(dian)(dian)壓(ya)(ya)，并使其中(zhong)一(yi)個(ge)(ge)(ge)像(xiang)素選(xuan)擇信(xin)號(hao)rsel1由(you)低電(dian)(dian)壓(ya)(ya)變為高電(dian)(dian)壓(ya)(ya)，保持(chi)兩個(ge)(ge)(ge)電(dian)(dian)容(rong)開(kai)關(guan)(guan)mos管(guan)m2和m5導通(tong)，將偏置mos管(guan)m9和其中(zhong)一(yi)個(ge)(ge)(ge)選(xuan)擇開(kai)關(guan)(guan)mos管(guan)m3打開(kai)，輸出對應相位(wei)保持(chi)子單(dan)元中(zhong)電(dian)(dian)容(rong)c1上存儲(chu)的電(dian)(dian)信(xin)號(hao)，即輸出pd1上的信(xin)號(hao)。

步(bu)驟5：使(shi)其(qi)中一(yi)個像(xiang)素(su)選(xuan)擇(ze)信(xin)號(hao)rsel1由高電(dian)(dian)壓(ya)變為低電(dian)(dian)壓(ya)，并(bing)使(shi)另一(yi)個像(xiang)素(su)選(xuan)擇(ze)信(xin)號(hao)rsel2由低電(dian)(dian)壓(ya)變為高電(dian)(dian)壓(ya)，將(jiang)打(da)開(kai)的上(shang)述其(qi)中一(yi)個選(xuan)擇(ze)開(kai)關(guan)mos管(guan)m3關(guan)斷(duan)，并(bing)將(jiang)另一(yi)個選(xuan)擇(ze)開(kai)關(guan)mos管(guan)m6打(da)開(kai)，以(yi)輸出另一(yi)個相位(wei)保持子單元中電(dian)(dian)容c2上(shang)存儲(chu)的電(dian)(dian)信(xin)號(hao)，即輸出pd2上(shang)的信(xin)號(hao)。

步驟6：使另一個(ge)(ge)像(xiang)素選擇(ze)信(xin)號rsel2由(you)(you)高(gao)電(dian)(dian)(dian)(dian)壓變為低(di)(di)電(dian)(dian)(dian)(dian)壓，并(bing)(bing)使偏置電(dian)(dian)(dian)(dian)壓bias、電(dian)(dian)(dian)(dian)容(rong)選擇(ze)信(xin)號csel由(you)(you)高(gao)電(dian)(dian)(dian)(dian)壓變為低(di)(di)電(dian)(dian)(dian)(dian)壓，保(bao)持選擇(ze)開(kai)關(guan)mos管(guan)m3關(guan)斷，將(jiang)打開(kai)的另一個(ge)(ge)選擇(ze)開(kai)關(guan)mos管(guan)m6關(guan)斷，并(bing)(bing)關(guan)斷電(dian)(dian)(dian)(dian)容(rong)開(kai)關(guan)mos管(guan)m2和m5和偏置mos管(guan)m9，準備進入下一幀信(xin)號的讀取(qu)。

綜上所述，本發(fa)明通(tong)過(guo)(guo)使相(xiang)位檢測(ce)(ce)像(xiang)素兩(liang)個感(gan)(gan)光單元(yuan)共(gong)用(yong)由信(xin)號(hao)采樣保持單元(yuan)、信(xin)號(hao)復位輸(shu)出單元(yuan)組成的一(yi)個讀(du)出電(dian)路，不僅在曝光之后(hou)能夠讀(du)出相(xiang)位檢測(ce)(ce)像(xiang)素單元(yuan)的信(xin)號(hao)，而且通(tong)過(guo)(guo)使兩(liang)個感(gan)(gan)光單元(yuan)轉化得到(dao)的電(dian)信(xin)號(hao)共(gong)用(yong)一(yi)個讀(du)出電(dian)路，避免(mian)了工藝(yi)偏差所導致的兩(liang)個電(dian)信(xin)號(hao)的噪聲差異，從而提高了相(xiang)位差檢測(ce)(ce)時(shi)的靈敏度。

以上所述(shu)的(de)僅為本發明(ming)的(de)優選實(shi)施(shi)例，所述(shu)實(shi)施(shi)例并非用(yong)以限(xian)制本發明(ming)的(de)專利保(bao)(bao)護范(fan)(fan)圍(wei)(wei)，因此凡是運用(yong)本發明(ming)的(de)說(shuo)明(ming)書(shu)及(ji)附(fu)圖內容(rong)所作的(de)等同結構變化，同理均(jun)應(ying)包(bao)含在本發明(ming)的(de)保(bao)(bao)護范(fan)(fan)圍(wei)(wei)內。