TW202244778A - Fingerprint acquisition circuit, fingerprint identification device and information processing device for performing a fingerprint acquisition operation on a capacitive sensor array including M×N sensing pixels - Google Patents
Fingerprint acquisition circuit, fingerprint identification device and information processing device for performing a fingerprint acquisition operation on a capacitive sensor array including M×N sensing pixels Download PDFInfo
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本發明為電容式指紋採集技術之相關領域,尤指應用於一指紋辨識裝置之中的一種指紋採集電路。The invention relates to the related field of capacitive fingerprint collection technology, especially a fingerprint collection circuit applied in a fingerprint identification device.
已知,電容式指紋辨識裝置目前已被廣泛地應用於各式電子產品之中。圖1顯示習知的一種電容式指紋辨識裝置的方塊圖。如圖1所示,習知的電容式指紋辨識裝置1a主要包括一電容式感測器陣列11a以及一指紋採集電路12a,且該電容式感測器陣列11a包括M×N個感測像素111a。舉例而言,圖1所示之感測器陣列模組11a包含8×8個感測像素111a。It is known that capacitive fingerprint recognition devices have been widely used in various electronic products. FIG. 1 shows a block diagram of a conventional capacitive fingerprint recognition device. As shown in FIG. 1 , a conventional capacitive fingerprint identification device 1a mainly includes a
進一步地,圖2顯示指紋採集電路12a的方塊圖。如圖2所示,所述指紋採集電路12a包括M×N個類比前端單元121a、和M×N個所述類比前端單元121a分別耦接的M×N個類比數位轉換單元122a、以及M×N個所述類比數位轉換單元122a耦接的一處理單元123a,其中,各所述類比前端單元121a耦接一感測像素111a,且一電流源120a耦皆於該感測像素111a和該類比前端單元121a之間。Further, FIG. 2 shows a block diagram of the
進行指紋採集工作時,在一指紋採集周期內,指紋採集電路12a以其M×N個類比前端單元121a依次(依序)自8×8個感測像素111a之中的每一個檢測出類比信號(即,電壓信號),接著由對應的類比數位轉換單元122a將該類比信號轉換成數位信號。最終,處理單元123a利用演算法處理所有數位信號,從而獲得一指紋採集圖像。When performing fingerprint collection work, within a fingerprint collection cycle, the
實務經驗指出,習知技術之指紋採集電路12a用於指紋採集時係顯示出採集效率不佳的缺點。主要原因在於,指紋採集電路12a在一指紋採集周期內係依次(依序)自M×N個所述個感測像素111a之中的每一個檢測出類比信號,無法在同一時間驅動多個感測像素111a,即同一時 間自多個感測像素111a檢測出類比信號。Practical experience points out that when the
由上述說明可知,本領域亟需一種新式的指紋採集電路。It can be seen from the above description that there is an urgent need for a new type of fingerprint collection circuit in this field.
本發明之主要目的在於提供一種指紋採集電路,用於對包含M×N個感測像素的一電容式感測器陣列執行一指紋採集操作。所述指紋採集電路包括:一數位信號產生單元、一處理單元以及耦接於M×N個所述感測像素和該數位信號產生單元之間的M×N個開關單元。其中,每個開關單元受控於一行選擇信號和一列選擇信號,從而,利用變更M個所述列選擇信號和N個所述行選擇信號之脈衝的準位和寬度,藉以部分或全部驅動該電容式感測器陣列所具有之M×N個感測像素。如此,包含本發明之指紋採集電路的指紋辨識裝置可支持同時開啟多個感測像素進行指紋信號採集,進以有效提高指紋信號量,實現降低指紋解鎖算法處理難度的有益效果。The main purpose of the present invention is to provide a fingerprint collection circuit for performing a fingerprint collection operation on a capacitive sensor array including M×N sensing pixels. The fingerprint collection circuit includes: a digital signal generating unit, a processing unit, and M×N switch units coupled between the M×N sensing pixels and the digital signal generating unit. Wherein, each switch unit is controlled by a row selection signal and a column selection signal, so that the level and width of the pulses of the M column selection signals and the N row selection signals are changed to partially or completely drive the switching unit. The capacitive sensor array has M×N sensing pixels. In this way, the fingerprint identification device including the fingerprint collection circuit of the present invention can simultaneously turn on multiple sensing pixels for fingerprint signal collection, thereby effectively increasing the amount of fingerprint signals and reducing the processing difficulty of the fingerprint unlocking algorithm.
為達成上述目的,本發明提出所述指紋採集電路的一實施例,其用於對包含M×N個感測像素的一電容式感測器陣列執行一指紋採集操作,其中該電容式感測器陣列包含複數個感測區塊,且各個所述感測區塊含有j×k個所述感測像素;所述指紋採集電路包括:To achieve the above object, the present invention proposes an embodiment of the fingerprint collection circuit, which is used to perform a fingerprint collection operation on a capacitive sensor array including M×N sensing pixels, wherein the capacitive sensing The sensor array includes a plurality of sensing blocks, and each of the sensing blocks contains j×k sensing pixels; the fingerprint collection circuit includes:
一數位信號產生單元,具有M×N個類比信號接收端以及M×N個數位信號輸出端;A digital signal generating unit with M×N analog signal receiving terminals and M×N digital signal output terminals;
一處理單元,耦接M×N個所述數位信號輸出端;以及a processing unit, coupled to the M×N digital signal output terminals; and
複數個具有一第一端、一第二端、一第三端與一控制端的第一開關單元;a plurality of first switch units having a first terminal, a second terminal, a third terminal and a control terminal;
其中,一個所述類比信號接收端直接耦接所述感測區塊的一個所述感測像素,(j×k)-1個所述第一開關單元以其所述第一端和該感測區塊的其餘(j×k)-1個所述感測像素分別耦接,(j×k)-1個所述第一開關單元以其所述第二端與M×N個所述類比信號接收端之中的(j×k)-1個分別耦接,(j×k)-1個所述第一開關單元以其所述第三端耦接和所述類比信號接收端直接耦接的該感測像素,且(j×k)-1個所述第一開關單元的控制端同時耦接一選擇信號SEL;Wherein, one analog signal receiving end is directly coupled to one sensing pixel of the sensing block, and (j×k)-1 first switch unit is connected to the sensing pixel by its first end and the sensing pixel. The remaining (j×k)-1 sensing pixels of the detection block are respectively coupled, and the (j×k)-1 first switch unit connects the second end of the (j×k)-1 said first switch unit with the M×N said The (j×k)-1 of the analog signal receiving ends are respectively coupled, and the (j×k)-1 first switch unit is directly connected to the analog signal receiving end by its third end coupling The sensing pixel is coupled, and the control terminals of (j×k)-1 first switch units are simultaneously coupled to a selection signal SEL;
其中,M、N、j、k皆為正整數,2≦j≦M,且2≦k≦N。Wherein, M, N, j, and k are all positive integers, 2≦j≦M, and 2≦k≦N.
在一實施例中,該數位信號產生單元包括:In one embodiment, the digital signal generating unit includes:
M×N個類比前端單元,與M×N個所述類比信號接收端分別耦接;以及M×N analog front-end units, respectively coupled to the M×N analog signal receiving ends; and
M×N個類比數位轉換單元,與M×N個所述類比前端單元分別耦接,且與M×N個所述數位信號輸出端分別耦接;M×N analog-to-digital conversion units, respectively coupled to the M×N analog front-end units, and respectively coupled to the M×N digital signal output terminals;
其中,所述類比前端單元透過所述類比信號接收端接受所述感測像素的一感測信號,接著對應地輸出一類比信號至所述類比數位轉換單元,使該類比數位轉換單元對應地輸出一數位信號至該處理單元。Wherein, the analog front-end unit receives a sensing signal of the sensing pixel through the analog signal receiving end, and then correspondingly outputs an analog signal to the analog-to-digital conversion unit, so that the analog-to-digital conversion unit correspondingly outputs A digital signal is sent to the processing unit.
在一實施例中,在所述選擇信號具有一第一準位時,所述第一開關單元內部形成連通於第一端和第二端之間的一第一通道,且在所述選擇信號具有一第二準位時,所述第一開關單元內部形成連通於第一端和第三端之間的一第二通道。In one embodiment, when the selection signal has a first level, a first channel connected between the first end and the second end is formed inside the first switch unit, and the selection signal When it has a second level, a second channel communicating between the first end and the third end is formed inside the first switch unit.
在一實施例中,於該電容式感測器陣列之中,所述感測區塊的數量為L=(M×N)/(j×k),L為正整數,且所述數位信號產生單元以其j×k個所述類比信號接收端自所述感測區塊接收所述感測信號。In one embodiment, in the capacitive sensor array, the number of the sensing blocks is L=(M×N)/(j×k), where L is a positive integer, and the digital signal The generating unit receives the sensing signal from the sensing block through its j×k analog signal receiving ends.
在可行的實施例中,本發明之所述指紋採集電路更包括:更包括:複數個受控於所述選擇信號的第二開關單元;其中,在每一組j×k個所述數位信號輸出端之中,一個所述數位信號輸出端係直接將所述數位信號輸出至該處理單元,其餘(j×k)-1個所述數位信號輸出則透過(j×k)-1個所述第二開關單元125傳送所述數位信號至該處理單元。In a feasible embodiment, the fingerprint collection circuit of the present invention further includes: further including: a plurality of second switch units controlled by the selection signal; wherein, in each group of j×k digital signals Among the output terminals, one of the digital signal output terminals directly outputs the digital signal to the processing unit, and the remaining (j×k)-1 digital signal outputs pass through (j×k)-1 digital signal output terminals. The
在一實施例中,在所述選擇信號SEL具有一第一準位時,所述第二開關單元內部形成一通道,使該處理單元透過該通道而自所述數位信號輸出端接收所述數位信號,且所述通道在所述選擇信號SEL具有一第二準位時關閉。In one embodiment, when the selection signal SEL has a first level, a channel is formed inside the second switch unit, so that the processing unit receives the digital signal from the digital signal output terminal through the channel. signal, and the channel is turned off when the selection signal SEL has a second level.
並且,本發明還提出所述指紋採集電路的另一實施例,用於對包含M×N個感測像素的一電容式感測器陣列執行一指紋採集操作,其中,該電容式感測器陣列包含複數個感測區塊,且各個所述感測區塊含有j×k個所述感測像素;所述指紋採集電路包括:Moreover, the present invention also proposes another embodiment of the fingerprint collection circuit, which is used to perform a fingerprint collection operation on a capacitive sensor array including M×N sensing pixels, wherein the capacitive sensor The array includes a plurality of sensing blocks, and each of the sensing blocks includes j×k sensing pixels; the fingerprint collection circuit includes:
一數位信號產生單元,具有M×N/j×k個類比信號接收端以及M×N/j×k個數位信號輸出端;A digital signal generating unit with M×N/j×k analog signal receiving terminals and M×N/j×k digital signal output terminals;
一處理單元,耦接M×N/j×k個所述數位信號輸出端;A processing unit, coupled to M×N/j×k digital signal output terminals;
複數個具有一第一端、一第二端、一第三端與一控制端的第一開關單元;以及a plurality of first switch units having a first terminal, a second terminal, a third terminal and a control terminal; and
一切換單元,具有j×k個信號接收端、一個信號輸出端和(j×k)-1個控制端;A switching unit with j×k signal receiving terminals, a signal output terminal and (j×k)-1 control terminals;
其中,該切換單元以其一個所述信號接收端耦接所述感測區塊的一個所述感測像素,(j×k)-1個所述第一開關單元以其所述第一端和該感測區塊的其餘(j×k)-1個所述感測像素分別耦接,(j×k)-1個所述第一開關單元以其所述第二端與該切換單元的其餘(j×k)-1個信號接收端個分別耦接,(j×k)-1個所述第一開關單元以其所述第三端耦接和所述信號接收端直接耦接的該感測像素,(j×k)-1個所述第一開關單元的控制端同時耦接一選擇信號,該切換單元的(j×k)-1個所述控制端亦耦接該選擇信號SEL,且該切換單元的該信號輸出端耦接一個所述類比信號接收端。Wherein, the switching unit is coupled to one sensing pixel of the sensing block through one of its signal receiving ends, and (j×k)-1 first switching units are connected through their first ends are respectively coupled to the remaining (j×k)-1 sensing pixels of the sensing block, and (j×k)-1 first switching units are connected to the switching unit through the second end thereof The remaining (j×k)-1 signal receiving terminals are respectively coupled, and the (j×k)-1 first switch units are directly coupled with the third terminal coupling and the signal receiving terminal In the sensing pixel, (j×k)-1 control terminals of the first switching unit are coupled to a selection signal at the same time, and (j×k)-1 control terminals of the switching unit are also coupled to the The signal SEL is selected, and the signal output end of the switching unit is coupled to an analog signal receiving end.
並且 ,本發明還提出所述指紋採集電路的又一實施例,其用於對包含M×N個感測像素的一電容式感測器陣列執行一指紋採集操作,其中該電容式感測器陣列包含複數個感測區塊,且各個所述感測區塊含有j×k個所述感測像素;所述指紋採集電路包括:Moreover, the present invention also proposes another embodiment of the fingerprint collection circuit, which is used to perform a fingerprint collection operation on a capacitive sensor array including M×N sensing pixels, wherein the capacitive sensor The array includes a plurality of sensing blocks, and each of the sensing blocks includes j×k sensing pixels; the fingerprint collection circuit includes:
一數位信號產生單元,具有M×N個類比信號接收端以及M×N個數位信號輸出端;A digital signal generating unit with M×N analog signal receiving terminals and M×N digital signal output terminals;
一處理單元,耦接M×N個所述數位信號輸出端;以及a processing unit, coupled to the M×N digital signal output terminals; and
一切換單元,包含M×N個開關單元;A switch unit, including M×N switch units;
其中,在一個所述感測區塊之中,j×k個所述感測像素透過j×k個所述開關單元而與j×k個所述類比信號接收端分別耦接,M、N、j、k皆為正整數,2≦j≦M,且2≦k≦N;Wherein, in one sensing block, j×k sensing pixels are respectively coupled to j×k analog signal receiving terminals through j×k switching units, M, N , j, and k are all positive integers, 2≦j≦M, and 2≦k≦N;
其中,各個所述開關單元皆具有一第一端、一第二端、一第一控制端以及一第二控制端,該第一端耦接所述感測像素,該第二端耦接所述類比信號接收端,該第一控制端耦接一第一選擇信號,且該第二控制端耦接一第二選擇信號。Wherein, each of the switch units has a first terminal, a second terminal, a first control terminal and a second control terminal, the first terminal is coupled to the sensing pixel, and the second terminal is coupled to the The analog signal receiving end, the first control end is coupled to a first selection signal, and the second control end is coupled to a second selection signal.
在一實施例中,該數位信號產生單元包括:In one embodiment, the digital signal generating unit includes:
M×N個類比前端單元,與M×N個所述類比信號接收端分別耦接;以及M×N analog front-end units, respectively coupled to the M×N analog signal receiving ends; and
M×N個類比數位轉換單元,與M×N個所述類比前端單元分別耦接,且與M×N個所述數位信號輸出端分別耦接;M×N analog-to-digital conversion units, respectively coupled to the M×N analog front-end units, and respectively coupled to the M×N digital signal output terminals;
其中,所述類比前端單元透過所述類比信號接收端接受所述感測像素的一感測信號,接著對應地輸出一類比信號至所述類比數位轉換單元,使該類比數位轉換單元對應地輸出一數位信號至該處理單元。Wherein, the analog front-end unit receives a sensing signal of the sensing pixel through the analog signal receiving end, and then correspondingly outputs an analog signal to the analog-to-digital conversion unit, so that the analog-to-digital conversion unit correspondingly outputs A digital signal is sent to the processing unit.
在一實施例中,在所述第一選擇信號和所述第二選擇信號皆具有一第一準位時,所述開關單元內部形成一通道,使所述類比信號接收端透過該通道自該感測區塊接收所述感測信號,且所述通道在該第一選擇信號和該第二選擇信號皆具有一第二準位時關閉。In one embodiment, when both the first selection signal and the second selection signal have a first level, a channel is formed inside the switch unit, so that the analog signal receiving end can transmit from the channel through the channel. The sensing block receives the sensing signal, and the channel is closed when both the first selection signal and the second selection signal have a second level.
並且,本發明同時揭示一種指紋辨識裝置,其特徵在於包括一電容式感測器陣列以及如前所述本發明之指紋採集電路。Moreover, the present invention also discloses a fingerprint identification device, which is characterized in that it includes a capacitive sensor array and the fingerprint collection circuit of the present invention as mentioned above.
本發明還揭示一種資訊處理裝置,其具有如前所述本發明之指紋辨識裝置。並且,在可行的實施例中,該資訊處理裝置是選自於由智能手機、智能手錶、智能手環、平板電腦、筆記型電腦、一體式電腦、和門禁裝置所組成群組之中的一種電子裝置。The present invention also discloses an information processing device, which has the fingerprint identification device of the present invention as mentioned above. And, in a feasible embodiment, the information processing device is selected from the group consisting of smart phones, smart watches, smart bracelets, tablet computers, notebook computers, all-in-one computers, and access control devices. electronic device.
為使 貴審查委員能進一步瞭解本發明之結構、特徵、目的、與其優點,茲附以圖式及較佳具體實施例之詳細說明如後。In order to enable your examiners to further understand the structure, features, purpose, and advantages of the present invention, drawings and detailed descriptions of preferred specific embodiments are hereby attached.
本發明旨在提出一種指紋採集電路,應用於一電容式指紋辨識晶片之中,使該電容式指紋辨識晶片支持同時開啟多個感測像素以進行區塊式的指紋信號採集,有效提高每一次採集之指紋信號量,從而實現降低指紋解鎖算法處理難度的有益效果。在應用本發明之指紋採集電路的情況下,電容式指紋辨識晶片可決定區塊感測像素的大小,顯示出支持多種DPI的指紋信號採集的功能,從而該電容式指紋辨識晶片能夠高效率地完成指紋圖像採集、比對及解鎖等一系列工作。The purpose of the present invention is to propose a fingerprint collection circuit, which is applied to a capacitive fingerprint recognition chip, so that the capacitive fingerprint recognition chip can simultaneously turn on multiple sensing pixels for block-type fingerprint signal collection, effectively improving each time The collected fingerprint semaphore, thereby achieving the beneficial effect of reducing the processing difficulty of the fingerprint unlocking algorithm. In the case of applying the fingerprint acquisition circuit of the present invention, the capacitive fingerprint identification chip can determine the size of the block sensing pixels, and display the function of fingerprint signal acquisition supporting multiple DPIs, so that the capacitive fingerprint identification chip can efficiently Complete a series of tasks such as fingerprint image collection, comparison and unlocking.
第一實施例first embodiment
圖3顯示包含本發明之一種指紋採集電路一電容式指紋辨識裝置的第一方塊圖。如圖3所示,電容式指紋辨識裝置1主要包括一電容式感測器陣列11以及本發明之指紋採集電路12,且該電容式感測器陣列11包括M×N個感測像素111。舉例而言,圖3所示之感測器陣列模組11包含8×8個感測像素111。FIG. 3 shows a first block diagram of a capacitive fingerprint recognition device including a fingerprint collection circuit of the present invention. As shown in FIG. 3 , the capacitive
圖4顯示本發明之指紋採集電路的第一方塊圖。在對照圖3的情況下,應可理解,圖4中僅繪出該電容式感測器陣列11之中的2×2個感測像素111,分別為p00、p01、p10以及p11。依據本發明之設計,所述指紋採集電路12包括:一數位信號產生單元120、一處理單元123、以及複數個具有一第一端、一第二端、一第三端與一控制端的第一開關單元124。更詳細地說明,本發明之指紋採集電路12可以依據不同需求決定一個感測區塊所涵蓋的感測像素111的數量。舉例而言,單個感測區塊含有j×k個所述感測像素111,此時,該電容式感測器陣列11所含有的感測區塊的數量為L=(M×N)/(j×k)。其中,M、N、j、k、L皆為正整數,2≦j≦M,且2≦k≦N。換句話說,最小的感測區塊係含有2×2個所述感測像素111。FIG. 4 shows the first block diagram of the fingerprint collection circuit of the present invention. In the case of FIG. 3 , it should be understood that only 2×2
如圖4所示,該數位信號產生單元120具有M×N個類比信號接收端以及M×N個數位信號輸出端,且該處理單元123耦接M×N個所述數位信號輸出端。依據本發明之設計,在一個感測區塊之中,一個所述類比信號接收端係直接耦接該感測區塊的一個所述感測像素111。並且,(j×k)-1個所述第一開關單元124以其所述第一端和該感測區塊的其餘(j×k)-1個所述感測像素111分別耦接,且(j×k)-1個所述第一開關單元124以其所述第二端與M×N個所述類比信號接收端之中的(j×k)-1個分別耦接。同時,(j×k)-1個所述第一開關單元124以其所述第三端耦接和所述類比信號接收端直接耦接的該感測像素111,且(j×k)-1個所述第一開關單元124的控制端同時耦接一選擇信號SEL。As shown in FIG. 4 , the digital
補充說明的是,如圖4所示,該數位信號產生單元120包括M×N個類比前端單元121以及M×N個類比數位轉換單元122,其中M×N個類比前端單元121與M×N個所述類比信號接收端分別耦接。並且,M×N個類比數位轉換單元122與M×N個所述類比前端單元121分別耦接,且與M×N個所述數位信號輸出端分別耦接。並且,圖4還繪示一電流源12C耦皆於該感測像素111和該類比前端單元121之間。就基礎功能上,所述類比前端單元121透過所述類比信號接收端接受所述感測像素111的一感測信號,接著對應地輸出一類比信號至所述類比數位轉換單元122,使該類比數位轉換單元122對應地輸出一數位信號至該處理單元123。It is supplemented that, as shown in FIG. 4 , the digital
繼續地參閱圖4,並請同時參閱圖5,其顯示本發明之指紋採集電路的第二方塊圖。如圖4所示,在所述選擇信號SEL具有一第一準位(如SEL=0)時,所述第一開關單元124內部形成連通於第一端和第二端之間的一第一通道。此時,在含有2×2個感測像素111的感測區塊中,如圖4所示,p00之感測像素111的感測信號由該數位信號產生單元120轉換成數位信號Vout00,p01之感測像素111的感測信號由該數位信號產生單元120轉換成數位信號Vout01,p10之感測像素111的感測信號由該數位信號產生單元120轉換成數位信號Vout10,且p11之感測像素111的感測信號由該數位信號產生單元120轉換成數位信號Vout11。Continue to refer to FIG. 4, and please refer to FIG. 5 at the same time, which shows the second block diagram of the fingerprint collection circuit of the present invention. As shown in FIG. 4, when the selection signal SEL has a first level (such as SEL=0), the
如圖5所示,在所述選擇信號SEL具有一第二準位(如SEL=1)時,所述第一開關單元124內部形成連通於第一端和第三端之間的一第二通道。此時,在含有2×2個感測像素111的感測區塊中,如圖5所示,p00之感測像素111、p01之感測像素111、p10之感測像素111以及p11之感測像素111相互並聯,從而,並聯的感測信號由該數位信號產生單元120轉換成數位信號Vout00。As shown in FIG. 5, when the selection signal SEL has a second level (such as SEL=1), the
圖6顯示數位信號產生單元、處理單元以及2×2個感測像素的感測區塊的第一方塊圖,且圖7顯示數位信號產生單元、處理單元以及2×2個感測像素的感測區塊的第二方塊圖。在可行的實施例中,如圖4與圖6所示,本發明之指紋採集電路12更包括:複數個受控於所述選擇信號SEL的第二開關單元125;其中,在每一組j×k個所述數位信號輸出端之中,一個所述數位信號輸出端係直接將所述數位信號輸出至該處理單元123,其餘(j×k)-1個所述數位信號輸出則透過(j×k)-1個所述第二開關單元125傳送所述數位信號至該處理單元123。如圖4與圖6所示,在所述選擇信號SEL具有一第一準位時,所述第二開關單元125內部形成一通道,使該處理單元123透過該通道而自所述數位信號輸出端接收所述數位信號。此時,在含有2×2個感測像素111的感測區塊中,如圖4與圖6所示,對應p00之感測像素111的數位信號Vout00、對應p01之感測像素111的數位信號Vout01、對應p10之感測像素111的數位信號Vout10、以及對應p11之感測像素111的數位信號Vout11各自由4個不同的數位信號輸出端傳送至該處理單元123。6 shows a first block diagram of a digital signal generating unit, a processing unit, and a sensing block of 2×2 sensing pixels, and FIG. 7 shows a digital signal generating unit, a processing unit, and a sensing block of 2×2 sensing pixels. The second block diagram of the measuring block. In a feasible embodiment, as shown in FIG. 4 and FIG. 6, the
如圖5與圖7所示,在所述選擇信號SEL具有一第二準位(如SEL=1)時,所述第二開關單元125內部的通道斷開。此時,在含有2×2個感測像素111的感測區塊中,如圖5所示,p00之感測像素111、p01之感測像素111、p10之感測像素111以及p11之感測像素111相互並聯,從而,並聯的感測信號由該數位信號產生單元120轉換成數位信號Vout00,而該數位信號Vout00由1個所述數位信號輸出端傳送至該處理單元123。As shown in FIG. 5 and FIG. 7 , when the selection signal SEL has a second level (for example, SEL=1), the channel inside the
第二實施例second embodiment
圖8顯示數位信號產生單元120、處理單元123、2×2個感測像素的感測區塊以及一個第一切換單元127的方塊圖。比較圖8與圖5之後,應可理解,依據圖8所呈現之設計,對應於包含L(即,M×N/j×k)個感測區塊之電容式感測器陣列11,利用增設第一切換單元127的方式,達到利用一個類比前端單元121和一個類比數位轉換單元122來處理包含j×k個感測像素111的一個感測區塊之感測信號的效果。換句話說,在第二實施例中,本發明之指紋採集電路12包括:具有L個類比前端單元121以及L個類比數位轉換單元122的一數位信號產生單元120、一處理單元123、複數個具有一第一端、一第二端、一第三端與一控制端的第一開關單元124、以及L個第一切換單元127。其中,該數位信號產生單元120具有L(即,M×N/j×k)個類比信號接收端以及L個數位信號輸出端,該處理單元123耦接L個所述數位信號輸出端,且該第一切換單元127具有j×k個信號接收端、一個信號輸出端和(j×k)-1個控制端。FIG. 8 shows a block diagram of a digital
更詳細地說明,該第一切換單元127以其一個所述信號接收端耦接所述感測區塊的一個所述感測像素111,(j×k)-1個所述第一開關單元124以其所述第一端和該感測區塊的其餘(j×k)-1個所述感測像素111分別耦接,(j×k)-1個所述第一開關單元124以其所述第二端與該第一切換單元127餘下的(j×k)-1個信號接收端個分別耦接,(j×k)-1個所述第一開關單元124以其所述第三端耦接和所述信號接收端直接耦接的該感測像素111,(j×k)-1個所述第一開關單元124的控制端同時耦接一選擇信號SEL,且該第一切換單元127的(j×k)-1個所述控制端亦耦接該選擇信號SEL。In more detail, the
由圖8可知,該第一切換單元127包括複數個開關元件1271。並且,就一個感測區塊而言,所配置的開關元件1271之數量相同於所配置的第一開關單元124之數量。如此設計,選擇信號具有(j×k)-1個開關控制位元,選擇信號為SEL[n:0],其中n=(j×k)-1。以j×k=2×2為例,該第一切換單元127共有四個信號接收端、一個信號輸出端和3個控制端,且選擇信號為SEL[2:0],包含位元SEL[2]、位元SEL[1]和位元SEL[0]。其中,第一切換單元127包含三個開關元件1271,且各所述開關元件1271皆具有一第一端、一第二端、一第三端以及一控制端。It can be seen from FIG. 8 that the
如圖8所示,第1個開關元件1271的第一端作為一信號接收端以耦接感測區塊的一個感測像素111,且其第二端亦作為一信號接收端以耦接第1個第一開關單元124的第二端。另一方面,第2個開關元件1271的第一端作為一信號接收端以耦接第1個第一開關單元124的第二端,且其第二端亦作為一信號接收端以耦接第3個第一開關單元124的第二端。並且,該第3個開關元件1271的第一端耦接第1個開關元件1271的第三端,其第二端耦接第2個開關元件1271的第三端,且其第三端作為該第一切換單元127的信號輸出端以耦接該數位信號產生單元120的一個類比信號接收端。As shown in FIG. 8, the first end of the
如圖8所示,第1個第一開關單元124的控制端作為該切換單元127的第1個控制端以耦接選擇信號以受控於位元SEL[1],第2個第一開關單元124的控制端作為該切換單元127的第2個控制端以耦接選擇信號以受控於位元SEL[1],且第3個第一開關單元124的控制端作為該切換單元127的第3個控制端以耦接選擇信號以受控於位元SEL[0]。值得注意的是,三個所述第一開關單元124的控制端同時耦接所述選擇信號以受控於位元SEL[2]。As shown in FIG. 8, the control terminal of the first
舉例而言,當選擇信號SEL[2:0]=為3’b100時,p00之感測像素111的感測信號最終由該數位信號產生單元120轉換成數位信號Vout。當選擇信號SEL[2:0]=為3’b110時,p01之感測像素111的感測信號最終由該數位信號產生單元120轉換成數位信號Vout。當選擇信號SEL[2:0]=為3’b101時,p10之感測像素111的感測信號最終由該數位信號產生單元120轉換成數位信號Vout。並且,當選擇信號SEL[2:0]=為3’b111時,p11之感測像素111的感測信號最終由該數位信號產生單元120轉換成數位信號Vout。進一步地,當選擇信號SEL[2:0]=為3’b000時,p00、p01、p10、p11此四個感測像素111(即,整個感測區塊)的感測信號最終由該數位信號產生單元120轉換成數位信號Vout。再者,當選擇信號SEL[2:0]=為3’b001、3’b010或3’b011時,p00、p01、p10、p11此四個感測像素111(即,感測區塊內的2×2個感測像素111)為浮接(floating)狀態。For example, when the selection signal SEL[2:0]=3'b100, the sensing signal of the
第三實施例third embodiment
圖9顯示包含本發明之一種指紋採集電路一電容式指紋辨識裝置的第二方塊圖。如圖9所示,電容式指紋辨識裝置1主要包括一電容式感測器陣列11以及本發明之指紋採集電路12,且該電容式感測器陣列11包括M×N個感測像素111。在第二實施例中,本發明之指紋採集電路12包括:一數位信號產生單元120、一處理單元123、以及M×N個開關單元的第二切換單元126。FIG. 9 shows a second block diagram of a capacitive fingerprint recognition device including a fingerprint collection circuit of the present invention. As shown in FIG. 9 , the capacitive
圖10顯示3×3個開關單元以及3×3個感測像素的第一架構圖。如圖10所示,在含有3×3個感測像素111的一個感測區塊之中,j×k(即,3×3)個所述感測像素111透過j×k個所述開關單元1261而與j×k個所述類比信號接收端分別耦接, M、N、j、k皆為正整數,2≦j≦M,且2≦k≦N。 其中,各個所述開關單元1261皆具有一第一端、一第二端、一第一控制端以及一第二控制端,該第一端耦接所述感測像素111,該第二端耦接所述類比信號接收端,該第一控制端耦接一第一選擇信號Col_SEL,且該第二控制端耦接一第二選擇信號Row_SEL。FIG. 10 shows a first structural diagram of 3×3 switch units and 3×3 sensing pixels. As shown in FIG. 10, in a sensing block containing 3×3
因此,M×N個開關單元1261會耦接N個所述行選擇信號(即,第一選擇信號Col_SEL)以及M個所述列選擇信號(即,第二選擇信號Row_SEL)。如此,在所述第一選擇信號Col_SEL和所述第二選擇信號Row_SEL皆具有一第一準位時(如SEL=1),所述開關單元1261內部形成一通道,使所述類比信號接收端透過該通道自該感測區塊接收所述感測信號。並且,圖11顯示3×3個開關單元以及3×3個感測像素的第二架構圖。如圖11所示,在所述第一選擇信號Col_SEL和所述第二選擇信號Row_SEL皆具有一第二準位時(如SEL=0),所述開關單元1261內部的通道關閉。Therefore, the M×
圖12為3個(即,N個)所述第一選擇信號Col_SEL和3個(即,M個)所述第二選擇信號Row_SEL的時序圖。如圖11所示,利用變更M個所述列選擇信號(即,第二選擇信號)和N個所述行選擇信號(即,第一選擇信號)之脈衝的準位和寬度,藉以部分或全部驅動該電容式感測器陣列所具有之M×N個感測像素111。如此,本發明之指紋採集電路12可支持同時開啟多個感測像素進行指紋信號採集,進以有效提高指紋信號量,實現降低指紋解鎖算法處理難度的有益效果。FIG. 12 is a timing diagram of three (ie, N) first selection signals Col_SEL and three (ie, M) second selection signals Row_SEL. As shown in Figure 11, by changing the level and width of the pulses of the M column selection signals (ie, the second selection signal) and the N row selection signals (ie, the first selection signal), in order to partially or All M×
如此,上述已完整且清楚地說明本發明之一種指紋採集電路12;並且,經由上述可得知本發明具有下列優點:Thus, the above has completely and clearly described a
(1)本發明揭示一種指紋採集電路,其用於對包含M×N個感測像素的一電容式感測器陣列執行一指紋採集操作。所述指紋採集電路包括:一數位信號產生單元、一處理單元以及耦接於M×N個所述感測像素和該數位信號產生單元之間的M×N個開關單元。其中,每個開關單元受控於一行選擇信號和一列選擇信號,從而,利用變更M個所述列選擇信號和N個所述行選擇信號之脈衝的準位和寬度,藉以部分或全部驅動該電容式感測器陣列所具有之M×N個感測像素。如此,包含本發明之指紋採集電路的指紋辨識裝置可支持同時開啟多個感測像素進行指紋信號採集,進以有效提高指紋信號量,實現降低指紋解鎖算法處理難度的有益效果。(1) The present invention discloses a fingerprint collection circuit for performing a fingerprint collection operation on a capacitive sensor array including M×N sensing pixels. The fingerprint collection circuit includes: a digital signal generating unit, a processing unit, and M×N switch units coupled between the M×N sensing pixels and the digital signal generating unit. Wherein, each switch unit is controlled by a row selection signal and a column selection signal, so that the level and width of the pulses of the M column selection signals and the N row selection signals are changed to partially or completely drive the switching unit. The capacitive sensor array has M×N sensing pixels. In this way, the fingerprint identification device including the fingerprint collection circuit of the present invention can simultaneously turn on multiple sensing pixels for fingerprint signal collection, thereby effectively increasing the amount of fingerprint signals and reducing the processing difficulty of the fingerprint unlocking algorithm.
(2)本發明同時揭示一種指紋辨識裝置,其特徵在於包括一電容式感測器陣列以及如前所述本發明之指紋採集電路。(2) The present invention also discloses a fingerprint identification device, which is characterized in that it includes a capacitive sensor array and the fingerprint collection circuit of the present invention as mentioned above.
(3)本發明同時提供一種資訊處理裝置,其包含如前所述本發明之指紋辨識裝置。並且,在可行的實施例中,該資訊處理裝置是選自於由智能手機、智能手錶、智能手環、平板電腦、筆記型電腦、一體式電腦、和門禁裝置所組成群組之中的一種電子裝置。(3) The present invention also provides an information processing device, which includes the fingerprint recognition device of the present invention as described above. And, in a feasible embodiment, the information processing device is selected from the group consisting of smart phones, smart watches, smart bracelets, tablet computers, notebook computers, all-in-one computers, and access control devices. electronic device.
必須加以強調的是,前述本案所揭示者乃為較佳實施例,舉凡局部之變更或修飾而源於本案之技術思想而為熟習該項技藝之人所易於推知者,俱不脫本案之專利權範疇。It must be emphasized that what is disclosed in the above-mentioned case is a preferred embodiment, and all partial changes or modifications derived from the technical ideas of this case and easily deduced by those familiar with the technology are all inseparable from the patent of this case. category of rights.
綜上所陳,本案無論目的、手段與功效,皆顯示其迥異於習知技術,且其首先發明合於實用,確實符合發明之專利要件,懇請 貴審查委員明察,並早日賜予專利俾嘉惠社會,是為至禱。To sum up, the purpose, means and efficacy of this case all show that it is very different from the conventional technology, and its first invention is practical, and indeed meets the patent requirements of the invention. I implore your review committee to be aware and grant a patent as soon as possible to benefit you. Society is for the Most Prayer.
1a:電容式指紋辨識裝置
11a:電容式感測器陣列
111a:感測像素
12a:指紋採集電路
120a:電流源
121a:類比前端單元
122a:類比數位轉換單元
123a:處理單元
1:電容式指紋辨識裝置
11:電容式感測器陣列
111:感測像素
12:指紋採集電路
12C:電流源
120:數位信號產生單元
121:類比前端單元
122:類比數位轉換單元
123:處理單元
124:第一開關單元
125:第二開關單元
127:第一切換單元
126:第二切換單元
1261:開關單元
1271:開關元件
1a: Capacitive
圖1為習知的一種電容式指紋感測裝置的方塊圖; 圖2為包含於習知的電容式指紋感測裝置之中的一指紋採集電路的方塊圖; 圖3為包含本發明之一種指紋採集電路一電容式指紋辨識裝置的第一方塊圖; 圖4為本發明之指紋採集電路的第一方塊圖; 圖5為本發明之指紋採集電路的第二方塊圖; 圖6為數位信號產生單元、處理單元以及2×2個感測像素的感測區塊的第一方塊圖; 圖7為數位信號產生單元、處理單元以及2×2個感測像素的感測區塊的第二方塊圖; 圖8為數位信號產生單元、處理單元、2×2個感測像素的感測區塊以及一個第一切換單元的方塊圖; 圖9為包含本發明之一種指紋採集電路一電容式指紋辨識裝置的第二方塊圖; 圖10為3×3個開關單元以及3×3個感測像素的第一架構圖; 圖11為3×3個開關單元以及3×3個感測像素的第二架構圖;以及 圖12為3個第一選擇信號和3個第二選擇信號的時序圖。 FIG. 1 is a block diagram of a conventional capacitive fingerprint sensing device; 2 is a block diagram of a fingerprint collection circuit included in a conventional capacitive fingerprint sensing device; 3 is a first block diagram of a capacitive fingerprint identification device comprising a fingerprint collection circuit of the present invention; Fig. 4 is the first block diagram of the fingerprint collection circuit of the present invention; Fig. 5 is the second block diagram of the fingerprint acquisition circuit of the present invention; 6 is a first block diagram of a digital signal generating unit, a processing unit, and a sensing block of 2×2 sensing pixels; 7 is a second block diagram of a digital signal generation unit, a processing unit, and a sensing block of 2×2 sensing pixels; 8 is a block diagram of a digital signal generation unit, a processing unit, a sensing block of 2×2 sensing pixels, and a first switching unit; 9 is a second block diagram of a capacitive fingerprint recognition device comprising a fingerprint collection circuit of the present invention; FIG. 10 is a first structural diagram of 3×3 switch units and 3×3 sensing pixels; FIG. 11 is a second structural diagram of 3×3 switch units and 3×3 sensing pixels; and FIG. 12 is a timing diagram of three first selection signals and three second selection signals.
111:感測像素 111: Sensing pixels
12:指紋採集電路 12: Fingerprint acquisition circuit
12C:電流源 12C: current source
120:數位信號產生單元 120: Digital signal generating unit
121:類比前端單元 121: Analog front-end unit
122:類比數位轉換單元 122: Analog-to-digital conversion unit
123:處理單元 123: Processing unit
124:第一開關單元 124: The first switch unit
Claims (14)
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