TWM604434U - Control circuit for controlling optical fingerprint sensor - Google Patents
Control circuit for controlling optical fingerprint sensor Download PDFInfo
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- TWM604434U TWM604434U TW109209500U TW109209500U TWM604434U TW M604434 U TWM604434 U TW M604434U TW 109209500 U TW109209500 U TW 109209500U TW 109209500 U TW109209500 U TW 109209500U TW M604434 U TWM604434 U TW M604434U
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
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- G—PHYSICS
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
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Abstract
Description
本創作係指一種用於光學式指紋感測器的控制電路,尤指一種可用於與觸控面板整合的光學式指紋感測器的控制電路。 This creation refers to a control circuit for an optical fingerprint sensor, especially a control circuit for an optical fingerprint sensor integrated with a touch panel.
指紋辨識技術已被廣泛用於各式各樣的電子產品,例如行動電話、筆記型電腦、平板電腦、個人數位助理(Personal Digital Assistant,PDA)、及可攜式電子裝置等,用來實現身分識別。通過指紋感測能夠方便地對使用者進行身分識別,使用者只須將手指放置在指紋感測面板或區域上,即可登入電子裝置,而無須輸入冗長且繁瑣的用戶名稱及密碼。 Fingerprint recognition technology has been widely used in various electronic products, such as mobile phones, notebook computers, tablet computers, personal digital assistants (Personal Digital Assistant, PDA), and portable electronic devices, etc., to achieve identity Recognition. The user's identity can be easily identified through fingerprint sensing. The user only needs to place his finger on the fingerprint sensing panel or area to log in to the electronic device without having to enter a long and cumbersome user name and password.
在各類型指紋感測技術中,光學式指紋感測方案通常應用於具有顯示面板的電子產品。一般來說,光學式指紋感測可和觸控面板互相整合,使得指紋感測與觸控感測操作可同時在電子裝置中實現。然而,為了捕捉指紋的微小波峰對波谷差異,需要精確地執行光學式指紋感測操作,而光學式指紋感測容易受到觸控感測操作的干擾。有鑑於此,習知技術實有改進之必要。 Among various types of fingerprint sensing technologies, optical fingerprint sensing solutions are usually applied to electronic products with display panels. Generally, optical fingerprint sensing can be integrated with a touch panel, so that fingerprint sensing and touch sensing operations can be implemented in an electronic device at the same time. However, in order to capture the small peak-to-valley difference of the fingerprint, the optical fingerprint sensing operation needs to be accurately performed, and the optical fingerprint sensing is easily interfered by the touch sensing operation. In view of this, it is necessary to improve the conventional technology.
因此,本創作之主要目的即在於提供一種可用於光學式指紋感測器 的控制電路及其光學式指紋感測器,以消除或降低觸控感測操作與指紋感測操作之間的干擾。 Therefore, the main purpose of this creation is to provide an optical fingerprint sensor The control circuit and its optical fingerprint sensor are used to eliminate or reduce the interference between touch sensing operation and fingerprint sensing operation.
本創作的一實施例揭露一種用於控制一光學式指紋感測器的控制電路。該光學式指紋感測器包含有複數個畫素,其中每一畫素具有一第一控制訊號線及一第二控制訊號線,且每一畫素另耦接於一第一電壓源線、一第二電壓源線及一感測線。該控制電路與一觸控控制器互相整合來進行以下之操作:當該觸控控制器處於一觸控操作期間時,該第一控制訊號線、該第二控制訊號線、該第一電壓源線、該第二電壓源線、該感測線以上當中至少之一者施加一抗負載驅動訊號。 An embodiment of the present invention discloses a control circuit for controlling an optical fingerprint sensor. The optical fingerprint sensor includes a plurality of pixels, wherein each pixel has a first control signal line and a second control signal line, and each pixel is additionally coupled to a first voltage source line, A second voltage source line and a sensing line. The control circuit and a touch controller are integrated with each other to perform the following operations: when the touch controller is in a touch operation period, the first control signal line, the second control signal line, and the first voltage source At least one of the line, the second voltage source line, and the sensing line applies an anti-load driving signal.
本創作的另一實施例揭露一種用於控制一光學式指紋感測器的控制電路。該光學式指紋感測器包含有複數個畫素,其中每一畫素具有一第一控制訊號線及一第二控制訊號線,且每一畫素另耦接於一第一電壓源線、一第二電壓源線及一感測線。該控制電路與一觸控控制器互相整合來進行以下之操作:當該觸控控制器處於一觸控操作期間時,該第一控制訊號線、該第二控制訊號線、該第一電壓源線、該第二電壓源線、該感測線全部處於浮空狀態。 Another embodiment of the present invention discloses a control circuit for controlling an optical fingerprint sensor. The optical fingerprint sensor includes a plurality of pixels, wherein each pixel has a first control signal line and a second control signal line, and each pixel is additionally coupled to a first voltage source line, A second voltage source line and a sensing line. The control circuit and a touch controller are integrated with each other to perform the following operations: when the touch controller is in a touch operation period, the first control signal line, the second control signal line, and the first voltage source The line, the second voltage source line, and the sensing line are all in a floating state.
10:顯示裝置 10: Display device
100:顯示面板 100: display panel
102:列驅動裝置 102: Column drive
104:行感測驅動裝置 104: Line sensing drive device
110:觸控感測層 110: Touch sensing layer
120:指紋感測層 120: Fingerprint sensing layer
112_1,112_2:開關器電路 112_1, 112_2: switch circuit
PD:光電元件 PD: Optoelectronics
SC:儲存電容 SC: storage capacitor
T1~T3:電晶體 T1~T3: Transistor
SVSS:第一電壓源線 SVSS: the first voltage source line
SVDD:第二電壓源線 SVDD: second voltage source line
R_SW1~R_SW3:控制訊號線 R_SW1~R_SW3: Control signal line
C_SEN:感測線 C_SEN: Sensing line
N1,N2:節點 N1, N2: Node
CC1,CC2,CC:耦合電容 CC1, CC2, CC: coupling capacitor
PSW1~PSW5:開關器 PSW1~PSW5: switch
80,90,1200:顯示系統 80, 90, 1200: display system
800:系統處理器 800: system processor
802:指紋觸控顯示整合電路 802: Fingerprint touch display integrated circuit
804:顯示面板 804: display panel
820:指紋控制電路 820: Fingerprint Control Circuit
822:觸控控制裝置 822: Touch control device
824:顯示驅動裝置 824: display driver
850,950,1000,1250:抗負載驅動電路 850, 950, 1000, 1250: anti-load drive circuit
902:觸控顯示驅動整合電路 902: Touch display drive integrated circuit
903:指紋讀出電路 903: Fingerprint Reading Circuit
1002:電壓產生器 1002: voltage generator
1004:抗負載驅動產生器 1004: Anti-load drive generator
ALDX:原始抗負載驅動訊號 ALDX: Original anti-load drive signal
VH,V1,V2:電壓 VH, V1, V2: voltage
1102,1104:穩壓器 1102, 1104: voltage regulator
1110:開關器模組 1110: switch module
C1,C2:電容 C1, C2: Capacitance
1150:數位類比轉換器 1150: digital-to-analog converter
DIG:數位碼 DIG: digital code
CTRL:控制訊號 CTRL: Control signal
1300,1400:流程 1300,1400: process
1302~1306,1402~1406:步驟 1302~1306,1402~1406: steps
第1圖為本創作實施例一顯示裝置之示意圖。 Figure 1 is a schematic diagram of a display device according to a creative embodiment.
第2圖繪示第1圖中的顯示裝置的3維視圖。 Figure 2 shows a 3D view of the display device in Figure 1.
第3圖繪示第1圖和第2圖所示的指紋感測層所包含的一指紋感測畫素之詳細結構。 FIG. 3 shows the detailed structure of a fingerprint sensing pixel included in the fingerprint sensing layer shown in FIG. 1 and FIG. 2.
第4圖為指紋感測畫素陣列中控制訊號線、感測線及電壓源線的配置之示意圖。 Figure 4 is a schematic diagram of the configuration of control signal lines, sensing lines, and voltage source lines in the fingerprint sensor pixel array.
第5A圖為施加抗負載驅動訊號至指紋感測畫素之示意圖。 FIG. 5A is a schematic diagram of applying an anti-load driving signal to a fingerprint sensor pixel.
第5B圖繪示施加抗負載驅動訊號以控制節點浮空的一種詳細實施方式。 FIG. 5B shows a detailed implementation of applying an anti-load driving signal to control the floating of the node.
第6圖為本創作實施例顯示裝置操作之時序圖。 Figure 6 is a timing diagram of the operation of the display device of the creative embodiment.
第7圖繪示一觸控操作期間內抗負載驅動訊號的詳細實施方式。 FIG. 7 shows a detailed implementation of the anti-load driving signal during a touch operation.
第8圖為本創作實施例一顯示系統之示意圖。 Figure 8 is a schematic diagram of the display system of the first creative embodiment.
第9圖為本創作實施例另一顯示系統之示意圖。 Figure 9 is a schematic diagram of another display system of the creative embodiment.
第10圖為本創作實施例抗負載驅動電路之示意圖。 Figure 10 is a schematic diagram of the anti-load driving circuit of the creative embodiment.
第11A及11B圖為抗負載驅動產生器的詳細實施方式之示意圖。 11A and 11B are schematic diagrams of detailed implementation of the anti-load drive generator.
第12圖為本創作實施例另一顯示系統之示意圖。 Figure 12 is a schematic diagram of another display system according to the creative embodiment.
第13圖為本創作實施例一流程之流程圖。 Figure 13 is a flow chart of the first process of creation.
第14圖為本創作實施例另一流程之流程圖 Figure 14 is a flowchart of another process of the creation embodiment
請參考第1圖,第1圖為本創作實施例一顯示裝置10之示意圖。如第1圖所示,顯示裝置10包含有一顯示面板100、一列驅動裝置102及一行感測驅動裝置104。在此例中,顯示面板100可被設定具有觸控感測及指紋感測功能,因此,可將具有觸控感測器陣列之一觸控感測層110以及具有指紋感測畫素陣列之一指紋感測層120疊合並整合於顯示面板100。列驅動裝置102及行感測驅動裝置104可構成指紋感測畫素陣列的一控制電路。顯示裝置10另可包含開關器電路112_1及112_2,其中每一開關器電路可由多工器及/或開關器所組成,用來選擇傳送控制訊號至指紋感測層120中的目標指紋感測畫素,或將感測訊號從指紋感測畫素傳送至行感測驅動裝置104中的目標接收器電路。顯示裝置10另可包含
顯示及觸控感測的控制電路,為求簡化,這些控制電路省略於第1圖中。
Please refer to Figure 1. Figure 1 is a schematic diagram of a
第2圖繪示顯示裝置10的3維視圖。詳細來說,觸控感測層110包含有一觸控感測器陣列,其中,觸控感測器陣列具有複數個感測墊(sensing pad)及複數條導線。觸控控制器可傳送觸控驅動訊號至感測墊,並對應接收觸控感測訊號以判斷觸控行為。觸控驅動訊號可以是一週期訊號,其可具有任何類型的脈衝,如弦波、方波、三角波或梯形波等。因此,觸控感測訊號亦可以是相對應的週期訊號,用來攜帶觸控感測資訊。指紋感測層120包含有一指紋感測畫素陣列,其中每一指紋感測畫素可包含數個電路元件,其分別以列方向及行方向的導線相互連接,列方向的導線連接至列驅動裝置102而行方向的導線連接至行感測驅動裝置104。這些導線可包含用來傳送控制訊號的數條控制訊號線,用來傳送電源電壓的數條電壓源線,以及用來傳送指紋感測訊號的數條感測線。
FIG. 2 shows a three-dimensional view of the
如第2圖所示,觸控感測層110及指紋感測層120為不同層但彼此接近,導致連結觸控感測墊的每一條導線和連結指紋感測畫素的每一條導線之間存在無法忽略的耦合電容。因此,當一觸控驅動訊號被傳送至觸控感測墊時,耦合電容可對觸控驅動訊號或對應的感測訊號進行耦合,以干擾控制訊號線、電壓源線及/或感測線上的電壓,因而在指紋感測操作上產生無法忽略的電容性負載。從觸控感測操作的角度來看,觸控感測層110及指紋感測層120之間的耦合電容也會影響觸控操作的感測訊號。
As shown in Figure 2, the
在此例中,觸控感測層110為疊合在指紋感測層120上方的上層。但在另一實施例中,亦可將指紋感測層設置為上層而將觸控感測層設置為下層。或者,亦可將觸控感測器及/或指紋感測器設置為多層結構。關於面板之結構
不應用以限制本創作的範疇。
In this example, the
第3圖繪示第1圖和第2圖所示的指紋感測層120所包含的一指紋感測畫素之詳細結構。在此例中,指紋感測畫素可用來實現一光學式指紋感測器,其包含有一光電元件PD、一儲存電容SC及三個電晶體T1~T3。指紋感測畫素可藉由透過一第一電壓源線SVSS接收的一第一電源電壓以及透過一第二電壓源線SVDD接收的一第二電源電壓來進行運作。在一實施例中,第一電源電壓可以是一負電源電壓或一接地電壓或一正電源電壓,而第二電源電壓可以是一負電源電壓或一接地電壓或一正電源電壓,電壓源線實際之極性安排由感測畫素的電路設計來決定,本創作不在此限。透過控制訊號線R_SW1~R_SW3可分別傳送三列控制訊號至畫素,使得畫素可透過一感測線C_SEN輸出一感測訊號。在另外一種實施例,指紋感測畫素可用來實現一光學式指紋感測器,其包含有一光電元件PD、一儲存電容SC及二個電晶體T1~T2,使得其電路結構更為精簡。
FIG. 3 shows the detailed structure of a fingerprint sensing pixel included in the
在指紋感測畫素中,光電元件PD可以是一光電二極體(photodiode),用來感測光線並將感測到的光線強度轉換為一電子訊號(如電壓訊號或電流訊號),此操作稱為“曝光”。在曝光期間內,電子訊號會流至儲存電容SC,並儲存在儲存電容SC中。電晶體T1作為一重置電晶體,可在曝光操作之前用來重置節點N2的電壓(即重置儲存在儲存電容SC中的電荷)。電晶體T2作為一源極隨耦器(source follower),可在曝光操作完畢之後,將光電元件PD所感測並儲存在儲存電容SC中的電子訊號傳送至感測線C_SEN。電晶體T3作為一選擇電晶體,可在其對應的畫素被選擇時,透過相對應的控制訊號開啟。 In fingerprint sensing pixels, the photoelectric element PD can be a photodiode, which is used to sense light and convert the sensed light intensity into an electronic signal (such as a voltage signal or a current signal). The operation is called "exposure". During the exposure period, the electronic signal will flow to the storage capacitor SC and be stored in the storage capacitor SC. As a reset transistor, the transistor T1 can be used to reset the voltage of the node N2 (ie, reset the charge stored in the storage capacitor SC) before the exposure operation. The transistor T2 acts as a source follower, which can transmit the electronic signal sensed by the photoelectric element PD and stored in the storage capacitor SC to the sensing line C_SEN after the exposure operation is completed. Transistor T3, as a selection transistor, can be turned on through a corresponding control signal when the corresponding pixel is selected.
如第3圖所示,電晶體T1具有一閘極端、一第一端及一第二端,其中, 閘極端耦接於控制訊號線R_SW1以接收一控制訊號(如重置訊號),第一端耦接於第一電壓源線SVSS,而第二端耦接於光電元件PD及儲存電容SC。需注意的是,電晶體T1之第一端可以是汲極端和源極端的其中一者,而電晶體T1之第二端為另一者,其係根據電晶體T1的電流方向而定。光電元件PD及儲存電容SC皆具有一第一端及一第二端,其中,第一端耦接於控制訊號線R_SW2以接收一控制訊號(如偏置電壓),而第二端耦接於電晶體T1之第二端。電晶體T2具有一閘極端、一第一端及一第二端,其中,閘極端耦接於電晶體T1之第二端、光電元件PD之第二端、以及儲存電容SC之第二端,第一端耦接於第二電壓源線SVDD,而第二端耦接於電晶體T3。需注意的是,電晶體T2之第一端可以是汲極端和源極端的其中一者,而電晶體T2之第二端為另一者,其係根據電晶體T2的電流方向而定。電晶體T3具有一閘極端、一第一端及一第二端,其中,閘極端耦接於控制訊號線R_SW3以接收一控制訊號(如選擇訊號),第一端耦接於電晶體T2之第二端,而第二端耦接於感測線C_SEN。需注意的是,電晶體T3之第一端可以是汲極端和源極端的其中一者,而電晶體T3之第二端為另一者,其係根據電晶體T3的電流方向而定。 As shown in Figure 3, the transistor T1 has a gate terminal, a first terminal and a second terminal. The gate terminal is coupled to the control signal line R_SW1 to receive a control signal (such as a reset signal), the first terminal is coupled to the first voltage source line SVSS, and the second terminal is coupled to the photoelectric element PD and the storage capacitor SC. It should be noted that the first terminal of the transistor T1 can be one of the drain terminal and the source terminal, and the second terminal of the transistor T1 is the other, which depends on the current direction of the transistor T1. The photoelectric element PD and the storage capacitor SC both have a first end and a second end, wherein the first end is coupled to the control signal line R_SW2 to receive a control signal (such as a bias voltage), and the second end is coupled to The second end of transistor T1. The transistor T2 has a gate terminal, a first terminal and a second terminal, wherein the gate terminal is coupled to the second terminal of the transistor T1, the second terminal of the photoelectric element PD, and the second terminal of the storage capacitor SC, The first terminal is coupled to the second voltage supply line SVDD, and the second terminal is coupled to the transistor T3. It should be noted that the first terminal of the transistor T2 can be one of the drain terminal and the source terminal, and the second terminal of the transistor T2 is the other, which depends on the current direction of the transistor T2. The transistor T3 has a gate terminal, a first terminal, and a second terminal. The gate terminal is coupled to the control signal line R_SW3 to receive a control signal (such as a selection signal), and the first terminal is coupled to the transistor T2 The second end, and the second end is coupled to the sensing line C_SEN. It should be noted that the first terminal of the transistor T3 can be one of the drain terminal and the source terminal, and the second terminal of the transistor T3 is the other, which depends on the current direction of the transistor T3.
請參考第4圖,第4圖為指紋感測畫素陣列中控制訊號線R_SW1~R_SW3、感測線C_SEN及電壓源線SVSS及SVDD的配置之示意圖。參見第4圖搭配第1圖所示,每一條控制訊號線R_SW1~R_SW3耦接於一列畫素,每一條感測線C_SEN耦接於一行畫素,每一條電壓源線SVSS或SVDD可透過行方向的連接線耦接至畫素。因此,控制訊號線R_SW1~R_SW3可耦接至列驅動裝置102,其用來發送相對應的控制訊號。感測線C_SEN可耦接至行感測驅動裝置104,其用來接收指紋感測訊號。由於控制訊號線R_SW1~R_SW3、感測線C_SEN及電壓源線SVSS及SVDD皆散布在指紋感測層120中,以上導線皆受到施加於觸控感測
層110的觸控驅動/感測訊號的干擾。
Please refer to Figure 4. Figure 4 is a schematic diagram of the configuration of the control signal lines R_SW1~R_SW3, the sensing line C_SEN, and the voltage source lines SVSS and SVDD in the fingerprint sensor pixel array. As shown in Figure 4 and Figure 1, each control signal line R_SW1~R_SW3 is coupled to a row of pixels, each sensing line C_SEN is coupled to a row of pixels, and each voltage source line SVSS or SVDD can pass through the row direction The connecting line is coupled to the pixel. Therefore, the control signal lines R_SW1 ˜R_SW3 can be coupled to the
根據光學式指紋感測操作,由光電元件PD產生的電子訊號係儲存於儲存電容SC,因此,應避免或降低儲存電容SC兩端(即節點N1及N2)上的電容性負載,此電容性負載可能來自於觸控感測墊上的觸控驅動或感測訊號。舉例來說,若指紋感測畫素中的節點N1與觸控感測層110中的觸控感測墊存在耦合電容時,施加在觸控感測墊上的觸控驅動或感測訊號會產生干擾而改變儲存在儲存電容SC中的電子訊號,導致輸出的指紋感測訊號產生誤差。為了消除或降低電容性負載,當觸控驅動訊號傳送至觸控感測層110時,可在指紋感測層120的導線上施加以抗負載驅動(Anti-Loading Driving,ALD)訊號或是使其處於浮空(floating)狀態。當觸控控制器處於一觸控操作期間時,每一條控制訊號線R_SW1~R_SW3、電壓源線SVSS及SVDD、感測線C_SEN以上當中至少之一者可施加一抗負載驅動訊號,其他沒有被施加抗負載驅動訊號者可使其處於浮空狀態。在另外一種實施例,當觸控控制器處於一觸控操作期間時,也可以讓每一條控制訊號線R_SW1~R_SW3、電壓源線SVSS及SVDD、感測線C_SEN全部處於浮空狀態。將訊號源頭的開關斷開即可使得該條導線處於浮空狀態,或是使其輸出為高阻抗,本創作不在此限。總之,透過施加抗負載驅動訊號或是使導線處於浮空狀態這兩種技術手段,或是併用兩種技術手段的各種排列組合可使得觸控控制器與指紋感測器之間訊號的耦合干擾降到最低。
According to the optical fingerprint sensing operation, the electronic signal generated by the photoelectric element PD is stored in the storage capacitor SC. Therefore, the capacitive load on both ends of the storage capacitor SC (ie nodes N1 and N2) should be avoided or reduced. The load may come from the touch driving or sensing signal on the touch sensing pad. For example, if there is a coupling capacitance between node N1 in the fingerprint sensing pixel and the touch sensing pad in the
請參考第5A圖,第5A圖為施加抗負載驅動訊號至指紋感測畫素之示意圖。詳細來說,一第一抗負載驅動訊號可施加在控制訊號線R_SW2上。由於控制訊號線R_SW2直接耦接至節點N1,第一抗負載驅動訊號可被傳送至節點N1以消除或降低儲存電容SC第一端的電容性負載。為了消除或降低儲存電容SC第 二端的電容性負載,一第二抗負載驅動訊號可被傳送至節點N2。由於節點N2耦接於電晶體T1及T2,可將第二抗負載驅動訊號施加在連接於電晶體T1及/或T2的任一或多條導線上。這些導線包含有控制訊號線R_SW1、第一電壓源線SVSS、第二電壓源線SVDD及感測線C_SEN等,但不限於此。若第二抗負載驅動訊號被施加到控制訊號線R_SW1及/或第一電壓源線SVSS時,第二抗負載驅動訊號可透過電晶體T1的寄生電容耦合至節點N2。若第二抗負載驅動訊號被施加到第二電壓源線SVDD及/或感測線C_SEN時,第二抗負載驅動訊號可透過電晶體T2的寄生電容耦合至節點N2。 Please refer to Figure 5A. Figure 5A is a schematic diagram of applying an anti-load driving signal to a fingerprint sensor pixel. In detail, a first anti-load driving signal can be applied to the control signal line R_SW2. Since the control signal line R_SW2 is directly coupled to the node N1, the first anti-load driving signal can be transmitted to the node N1 to eliminate or reduce the capacitive load at the first end of the storage capacitor SC. In order to eliminate or reduce the storage capacitor SC With two-terminal capacitive loads, a second anti-load driving signal can be transmitted to node N2. Since the node N2 is coupled to the transistors T1 and T2, the second anti-load driving signal can be applied to any one or more wires connected to the transistors T1 and/or T2. These wires include the control signal line R_SW1, the first voltage source line SVSS, the second voltage source line SVDD, the sensing line C_SEN, etc., but are not limited thereto. If the second anti-load driving signal is applied to the control signal line R_SW1 and/or the first voltage source line SVSS, the second anti-load driving signal can be coupled to the node N2 through the parasitic capacitance of the transistor T1. If the second anti-load driving signal is applied to the second voltage source line SVDD and/or the sensing line C_SEN, the second anti-load driving signal can be coupled to the node N2 through the parasitic capacitance of the transistor T2.
值得注意的是,抗負載驅動訊號之目的在於消除或降低指紋感測畫素中的電容性負載。較佳地,可將抗負載驅動訊號設計為完全相同於傳送至觸控感測墊的觸控驅動訊號,如第5A圖所示。透過耦合電容CC1及CC2的耦合運作,指紋感測畫素會受到觸控驅動訊號的干擾。在沒有抗負載驅動訊號的情況下,當觸控驅動訊號上下切換時,觸控驅動訊號上的電壓變化會對耦合電容CC1及CC2充放電,導致節點N1及/或N2上出現無法預期的電壓變化。當觸控驅動訊號上下切換時,若施加在節點N1及N2上的抗負載驅動訊號完全相同於觸控驅動訊號,則耦合電容CC1及CC2的跨壓會維持恆定,意即耦合電容CC1及CC2不進行充放電,因而不影響儲存電容SC內所儲存的電子訊號。 It is worth noting that the purpose of the anti-load driving signal is to eliminate or reduce the capacitive load in the fingerprint sensing pixel. Preferably, the anti-load driving signal can be designed to be exactly the same as the touch driving signal transmitted to the touch sensing pad, as shown in FIG. 5A. Through the coupling operation of the coupling capacitors CC1 and CC2, the fingerprint sensing pixels will be interfered by the touch driving signal. In the absence of an anti-load driving signal, when the touch driving signal is switched up and down, the voltage change on the touch driving signal will charge and discharge the coupling capacitors CC1 and CC2, causing unexpected voltages on nodes N1 and/or N2 Variety. When the touch drive signal is switched up and down, if the anti-load drive signal applied to nodes N1 and N2 is exactly the same as the touch drive signal, the cross voltage of the coupling capacitors CC1 and CC2 will remain constant, which means the coupling capacitors CC1 and CC2 No charge and discharge are performed, so the electronic signal stored in the storage capacitor SC is not affected.
如上所述,觸控驅動訊號可以是具有複數個脈衝的週期訊號。因此,抗負載驅動訊號亦可以是具有多個脈衝的調變訊號,其脈衝的頻率、相位及振幅實質上分別相同於觸控驅動訊號之脈衝的頻率、相位及振幅。由於觸控驅動訊號可包含任何類型的脈衝,如弦波、方波、三角波或梯形波等,因此可將抗負載驅動訊號調變為包含相同或相似類型的脈衝。 As mentioned above, the touch driving signal may be a periodic signal with a plurality of pulses. Therefore, the anti-load driving signal can also be a modulation signal with multiple pulses, and the pulse frequency, phase, and amplitude of the pulse are substantially the same as those of the touch driving signal. Since the touch driving signal can include any type of pulse, such as sine wave, square wave, triangle wave, or trapezoidal wave, the anti-load driving signal can be adjusted to include the same or similar type of pulse.
值得注意的是,抗負載驅動訊號可能相同於或不完全相同於觸控訊號(如觸控驅動訊號或觸控感測訊號)。舉例來說,在一實施例中,抗負載驅動訊號的振幅可能略小於觸控驅動訊號的振幅,其頻率和相位則大致相同。可替換地或額外地,抗負載驅動訊號的相位相對於觸控驅動訊號的相位可能存在微小偏移,其頻率則大致相同。若抗負載驅動訊號及觸控訊號之間的相似度較高時,能夠使控制指紋感測畫素之電容性負載下降的效能獲得提升。 It is worth noting that the anti-load driving signal may or may not be the same as the touch signal (such as the touch driving signal or the touch sensing signal). For example, in one embodiment, the amplitude of the anti-load driving signal may be slightly smaller than the amplitude of the touch driving signal, and the frequency and phase thereof are approximately the same. Alternatively or additionally, the phase of the anti-load driving signal may have a slight deviation from the phase of the touch driving signal, and the frequency may be approximately the same. If the similarity between the anti-load driving signal and the touch signal is high, the performance of controlling the capacitive load drop of the fingerprint sensing pixel can be improved.
抗負載驅動訊號可透過任何方式施加在指紋感測畫素的導線上。在一實施例中,藉由抗負載驅動訊號來驅動一目標導線,可將抗負載驅動訊號施加在該目標導線上,其中,抗負載驅動訊號實質上相同於觸控訊號(具有相同頻率、相位及/或振幅)。可替換地或額外地,可將抗負載驅動訊號施加在一目標導線的開關器上,以控制相對應的節點為浮空狀態,在此例中,抗負載驅動訊號可具有任何可能的型態。舉例來說,抗負載驅動訊號可以是具有上述任何類型的脈衝之一週期訊號,或者可以是位於適當電壓準位而能夠關閉相對應開關器的訊號。只要透過抗負載驅動訊號能夠將開關器關閉使得目標節點在一段期間內為浮空狀態,皆屬於可行的抗負載驅動操作。浮空狀態使得目標節點的電壓可在耦合電容CC1或CC2運作之下隨著觸控訊號的脈衝而向上或向下移位。節點為浮空狀態代表節點的每一端僅連接至高阻抗端點,或者節點的任何外接連線都斷開,也就是說,所有連接至該節點的開關器皆關閉。為達到省電的目的,或者當無法藉由訊號來驅動目標導線時,即可採用浮空操作。接收抗負載驅動訊號的目標導線可以是耦接於節點N1的控制訊號線R_SW2及/或耦接至畫素的任何其它導線,例如控制訊號線R_SW1和R_SW3、第一電壓源線SVSS、第二電壓源線SVDD及感測線C_SEN等。 The anti-load driving signal can be applied to the wire of the fingerprint sensing pixel by any method. In one embodiment, by driving a target wire with an anti-load driving signal, the anti-load driving signal can be applied to the target wire, wherein the anti-load driving signal is substantially the same as the touch signal (having the same frequency and phase). And/or amplitude). Alternatively or additionally, the anti-load driving signal can be applied to the switch of a target wire to control the corresponding node to be in a floating state. In this example, the anti-load driving signal can have any possible type . For example, the anti-load driving signal can be a periodic signal with any of the above-mentioned types of pulses, or can be a signal that is at an appropriate voltage level and can turn off the corresponding switch. As long as the switch can be closed through the anti-load drive signal so that the target node is in a floating state for a period of time, it is a feasible anti-load drive operation. The floating state allows the voltage of the target node to shift up or down with the pulse of the touch signal under the operation of the coupling capacitor CC1 or CC2. The floating state of a node means that each end of the node is only connected to a high-impedance terminal, or any external connection of the node is disconnected, that is, all switches connected to the node are closed. In order to achieve the purpose of power saving, or when the target wire cannot be driven by the signal, the floating operation can be adopted. The target wire for receiving the anti-load driving signal can be the control signal line R_SW2 coupled to the node N1 and/or any other wire coupled to the pixel, such as the control signal lines R_SW1 and R_SW3, the first voltage source line SVSS, and the second Voltage source line SVDD and sensing line C_SEN, etc.
第5B圖繪示施加抗負載驅動訊號以控制節點浮空的一種詳細實施方式。第5B圖所示的畫素結構類似於第5A圖所示的畫素結構,故功能相似的訊號或元件皆以相同符號表示。第5B圖之結構另包含開關器PSW1~PSW5,其分別耦接於控制訊號線R_SW2、控制訊號線R_SW1、第一電壓源線SVSS、第二電壓源線SVDD及感測線C_SEN。需注意的是,每一個開關器PSW1~PSW5可以是目標畫素專用的開關器,或者是用來連接一列或一行畫素之目標導線的開關器。在另外一種實施例,將訊號源頭的開關斷開即可使得該訊號線、電壓源線或感測線處於浮空狀態,或是使其輸出為高阻抗,也可以將上述全部導線接在一起由一個總開關來控制,本創作不在此限。 FIG. 5B shows a detailed implementation of applying an anti-load driving signal to control the floating of the node. The pixel structure shown in FIG. 5B is similar to the pixel structure shown in FIG. 5A, so signals or components with similar functions are represented by the same symbols. The structure of FIG. 5B further includes switches PSW1 to PSW5, which are respectively coupled to the control signal line R_SW2, the control signal line R_SW1, the first voltage source line SVSS, the second voltage source line SVDD, and the sensing line C_SEN. It should be noted that each switch PSW1~PSW5 can be a switch dedicated to the target pixel, or a switch used to connect the target wire of a column or row of pixels. In another embodiment, turning off the switch of the signal source can make the signal line, voltage source line or sensing line in a floating state, or make the output high impedance, or connect all the above wires together by Controlled by a master switch, this creation is not limited to this.
詳細來說,為了在指紋感測畫素上施加以抗負載驅動訊號,可將一第一抗負載驅動訊號施加於開關器PSW1。在此情況下,可關閉耦接於節點N1及控制訊號線R_SW2之間的開關器PSW1,進而控制節點N1浮空。此外,為了控制節點N2浮空,可將一第二抗負載驅動訊號施加於耦接於控制訊號線R_SW1的開關器PSW2、耦接於第一電壓源線SVSS的開關器PSW3、耦接於第二電壓源線SVDD的開關器PSW4、以及耦接於感測線C_SEN的開關器PSW5當中任一或多者。在此情況下,畫素上耦接於控制訊號線R_SW1、第一電壓源線SVSS、第二電壓源線SVDD及感測線C_SEN的任何節點皆可為浮空狀態,因此節點N2亦為浮空狀態。 In detail, in order to apply an anti-load driving signal to the fingerprint sensing pixel, a first anti-load driving signal can be applied to the switch PSW1. In this case, the switch PSW1 coupled between the node N1 and the control signal line R_SW2 can be turned off to control the node N1 to float. In addition, in order to control the floating of the node N2, a second anti-load driving signal can be applied to the switch PSW2 coupled to the control signal line R_SW1, the switch PSW3 coupled to the first voltage source line SVSS, and the switch PSW3 coupled to the first voltage source line SVSS. Any one or more of the switch PSW4 of the two voltage source lines SVDD and the switch PSW5 coupled to the sensing line C_SEN. In this case, any node on the pixel coupled to the control signal line R_SW1, the first voltage source line SVSS, the second voltage source line SVDD, and the sensing line C_SEN can be in a floating state, so the node N2 is also floating status.
對於指紋感測層120上的指紋感測畫素陣列而言,每一畫素上的抗負載驅動訊號皆可彈性地透過以抗負載驅動訊號來驅動及/或控制節點浮空的方式實現。舉例來說,一第一畫素的導線可由一抗負載驅動訊號來驅動,同時一
第二畫素的導線可由一抗負載驅動訊號進行控制使得相對應的節點浮空。用於具有2行(行1及行2)以及2列(列1及列2)的指紋感測畫素陣列之抗負載驅動訊號可透過表1的各種方式來實現,如下所示:
根據表1,用於畫素陣列的抗負載驅動訊號包含有至少16種不同實施方式,且抗負載驅動訊號可以在觸控驅動訊號傳送至觸控元件時進行施加。需注意的是,一般指紋感測畫素陣列可包含多於2列及2行的畫素,因此,存在更多種可能的驅動及浮空操作的組合。在一實施例中,亦可針對用於同一列畫素的不同連接導線及/或用於同一行畫素的不同連接導線以不同方式來實施抗負載驅動訊號,進而達到抗負載驅動操作的彈性。 According to Table 1, the anti-load driving signal for the pixel array includes at least 16 different implementations, and the anti-load driving signal can be applied when the touch driving signal is transmitted to the touch element. It should be noted that a general fingerprint sensing pixel array may include more than 2 columns and 2 rows of pixels. Therefore, there are more possible combinations of driving and floating operations. In one embodiment, different connecting wires used for the same column of pixels and/or different connecting wires used for the same row of pixels can be used to implement the anti-load driving signal in different ways, thereby achieving the flexibility of the anti-load driving operation .
請參考第6圖,第6圖為本創作實施例一顯示裝置操作之時序圖。為了降低顯示、觸控感測、及指紋感測操作之間的干擾,這些操作可分時進行。如第6圖所示,在每一圖框(frame)的顯示時間內具有觸控操作期間(TP)及顯示期間(DP)交替設置,而指紋感測期間(FP)可設置於二連續顯示圖框之間的空白時間(blank time)。參見第6圖搭配第3圖所示,光學式指紋感測器的運作要求節點N2被重置至一預定電壓準位,隨後開始曝光,接著在曝光期間結束時讀出於曝光程序中產生的電子訊號。一般來說,曝光期間可持續一圖框的顯示週期,其包含有多段顯示期間及觸控操作期間,如第6圖所示。在另一實施例中,為了產生足夠感測訊號量,曝光期間亦可橫跨數個顯示圖框。 Please refer to Fig. 6, which is a timing diagram of the operation of the display device according to the first creative embodiment. In order to reduce the interference between the display, touch sensing, and fingerprint sensing operations, these operations can be performed in a time-sharing manner. As shown in Figure 6, there is a touch operation period (TP) and a display period (DP) alternately set within the display time of each frame, and the fingerprint sensing period (FP) can be set in two consecutive displays The blank time between frames. As shown in Figure 6 and Figure 3, the operation of the optical fingerprint sensor requires that the node N2 be reset to a predetermined voltage level, and then the exposure starts, and then at the end of the exposure period, the output generated in the exposure process is read out Electronic signal. Generally speaking, the exposure period can last for a frame display period, which includes multiple display periods and touch operation periods, as shown in FIG. 6. In another embodiment, in order to generate a sufficient amount of sensing signals, several display frames may also be spanned during the exposure period.
在曝光期間內,光電元件PD可持續產生電子訊號並累績在儲存電容SC中,使節點N2的電壓隨之而變化。因此,在曝光期間內需施加以抗負載驅動訊號,以避免指紋感測訊號讀出之前,儲存於儲存電容SC中的電荷(即儲存電容SC的跨壓)受到觸控訊號的干擾。 During the exposure period, the photoelectric element PD can continuously generate electronic signals and accumulate them in the storage capacitor SC, so that the voltage of the node N2 changes accordingly. Therefore, an anti-load driving signal needs to be applied during the exposure period to prevent the charge stored in the storage capacitor SC (that is, the cross pressure of the storage capacitor SC) from being interfered by the touch signal before the fingerprint sensing signal is read out.
更明確來說,觸控之操作可在觸控操作期間內進行,亦即,觸控驅動訊號通常在觸控操作期間內上下切換。因此,抗負載驅動訊號亦可在觸控操 作期間內進行施加。第7圖繪示一觸控操作期間內抗負載驅動訊號的詳細實施方式。如第7圖所示,在觸控操作期間內,觸控感測線可從一感測墊接收觸控訊號,觸控訊號具有方波脈衝,其振幅等於△V。因此,抗負載驅動操作可在觸控操作期間內施加在指紋感測畫素上。 More specifically, the touch operation can be performed during the touch operation period, that is, the touch driving signal usually switches up and down during the touch operation period. Therefore, the anti-load drive signal can also be used in touch operation Apply during the work period. FIG. 7 shows a detailed implementation of the anti-load driving signal during a touch operation. As shown in Figure 7, during the touch operation period, the touch sensing line can receive a touch signal from a sensing pad. The touch signal has a square wave pulse with an amplitude equal to ΔV. Therefore, the anti-load driving operation can be applied to the fingerprint sensing pixel during the touch operation.
在此例中,第一電壓源線SVSS及第二電壓源線SVDD可在指紋感測期間及顯示期間內傳送一電源電壓,而在觸控操作期間內傳送抗負載驅動訊號,其中,抗負載驅動訊號可包含多個脈衝,這些脈衝可藉由在電源電壓上調變而產生,且和施加在觸控感測線上的觸控訊號具有實質上相同的頻率、相位及振幅。控制訊號線R_SW1~R_SW3可在指紋感測期間及顯示期間內傳送對應的控制訊號,並且在觸控操作期間內傳送抗負載驅動訊號,其中,抗負載驅動訊號可包含多個脈衝,這些脈衝可藉由在控制訊號上調變而產生,且和施加在觸控感測線上的觸控訊號具有實質上相同的頻率、相位及振幅。感測線C_SEN可在指紋感測期間內傳送感測訊號,並且在觸控操作期間傳送抗負載驅動訊號,其中,抗負載驅動訊號可包含多個脈衝,這些脈衝可藉由在感測訊號調變而產生,且和施加在觸控感測線上的觸控訊號具有實質上相同的頻率、相位及振幅。 In this example, the first voltage source line SVSS and the second voltage source line SVDD can transmit a power supply voltage during the fingerprint sensing period and the display period, and transmit the anti-load driving signal during the touch operation period. The driving signal may include multiple pulses, which can be generated by modulating the power supply voltage, and have substantially the same frequency, phase, and amplitude as the touch signal applied on the touch sensing line. The control signal lines R_SW1~R_SW3 can transmit corresponding control signals during the fingerprint sensing period and the display period, and transmit the anti-load driving signal during the touch operation period. The anti-load driving signal can include multiple pulses. It is generated by modulating the control signal and has substantially the same frequency, phase and amplitude as the touch signal applied on the touch sensing line. The sensing line C_SEN can transmit the sensing signal during the fingerprint sensing period and the anti-load driving signal during the touch operation. The anti-load driving signal can include multiple pulses, which can be modulated by the sensing signal It is generated and has substantially the same frequency, phase and amplitude as the touch signal applied on the touch sensing line.
請參考第8圖,第8圖為本創作實施例一顯示系統80之示意圖。如第8圖所示,顯示系統80包含有一系統處理器800、一指紋觸控顯示整合(Fingerprint,Touch and Display Integration,FTDI)電路802及一顯示面板804,其中,指紋觸控顯示整合電路802可以是整合顯示、觸控及指紋處理電路的單晶片。詳細來說,系統處理器800可以是顯示系統80的核心處理器,例如中央處理單元(Central Processing Unit,CPU)、微控制器(Microcontroller Unit,MCU)、或微處理器
等類似元件。對於智慧型手機而言,系統處理器800可以是用來控制手機各項應用及操作的微控制器。需注意的是,用於指紋辨識的演算法通常相當複雜,因此,指紋匹配及判斷應在具有龐大運算資源的系統處理器800上執行,其較難以實現於指紋觸控顯示整合電路802中。指紋觸控顯示整合電路802負責從顯示面板804捕捉或取出指紋影像,並且對接收到的指紋感測訊號進行處理,以放大並取得所需的波峰和波谷資訊。
Please refer to Fig. 8, which is a schematic diagram of the
顯示面板804可以是如第1圖所示的顯示面板100,其包含有觸控感測層110及指紋感測層120,用來實現顯示、觸控感測及指紋感測的三合一操作。指紋觸控顯示整合電路802可作為一控制電路,用來控制顯示面板804的顯示、觸控及指紋感測等操作。在一實施例中,顯示面板804可以是內嵌式(in-cell)觸控及指紋面板,其內部設置有觸控感測器和指紋感測器及其相關的連接線路。因此,觸控感測層110及指紋感測層120之間的距離十分接近,因而位於觸控感測層110及指紋感測層120之間的耦合電容可在指紋感測操作上產生大量的負載。
The
如第8圖所示,指紋觸控顯示整合電路802整合了一指紋控制電路820、一觸控控制裝置822及一顯示驅動裝置824,其中,每一模組皆可透過特定的介面與系統處理器800進行通訊。指紋觸控顯示整合電路802另可包含一抗負載驅動電路850,可選擇將其設置於觸控控制裝置822或指紋控制電路820中(在第8圖的實施例中,抗負載驅動電路850設置於指紋控制電路820)。指紋控制電路820可包含例如第1圖所示的列驅動裝置(及/或感測裝置)以及行驅動裝置(及/或感測裝置),其可發送控制訊號以控制顯示面板804上的指紋感測畫素,使畫素以一特定順序輸出指紋感測訊號。指紋控制電路820亦可包含一讀出
電路,用來從每一指紋感測畫素接收感測訊號。觸控控制裝置822可用來發送觸控驅動訊號至顯示面板804中觸控感測層上的觸控感測墊,並對應接收觸控感測訊號。顯示驅動裝置824可用來進行顯示面板804的顯示控制。更明確來說,顯示驅動裝置824可從系統處理器800接收影像資料,並對應產生及輸出影像訊號至顯示面板804。
As shown in Figure 8, the fingerprint touch display integrated
為了實現抗負載驅動操作,在觸控操作期間及/或曝光期間內,指紋觸控顯示整合電路802中的抗負載驅動電路850另可透過抗負載驅動訊號來驅動連接於指紋感測畫素的導線,或控制指紋感測畫素中相對應的節點浮空。在一實施例中,設置於指紋控制電路820中的抗負載驅動電路850可根據從觸控控制裝置822接收到的通知來施加抗負載驅動訊號,使得抗負載驅動訊號與觸控訊號同步,同時抗負載驅動訊號與觸控訊號可被設定為具有相同頻率和相位、及/或相同振幅。來自於觸控控制裝置822的通知可以是任何形式,例如一旗標、一電壓準位、或是在指紋控制電路820與觸控控制裝置822之間的一連接線上產生的訊號切換。
In order to realize the anti-load driving operation, during the touch operation and/or during the exposure period, the
在觸控操作期間內,除了指紋控制電路820之外,顯示驅動裝置824亦可將一抗負載驅動訊號施加在顯示面板804的顯示電路上,可避免或降低顯示畫素與觸控感測層之間的耦合電容在顯示電路上造成的電容性負載。
During the touch operation period, in addition to the
值得注意的是,第8圖中指紋觸控顯示整合電路802的實施方式僅為本創作眾多實施例當中的一種。在另一實施例中,用來控制顯示面板的電路亦可採用雙晶片的方案來實現。請參考第9圖,第9圖為本創作實施例另一顯示系統90之示意圖。顯示系統90的電路結構類似於顯示系統80的電路結構,故功能
相似的訊號或元件皆以相同符號表示。如第9圖所示,顯示系統90與顯示系統80的不同之處在於,顯示系統90包含有一觸控顯示驅動整合(Touch and Display Driving Integration,TDDI)電路902及一指紋讀出電路(Fingerprint Readout Integrated Circuit,FPR ROIC)903,其可用來取代顯示系統80中的指紋觸控顯示整合電路802的功能。指紋讀出電路903可具有一抗負載驅動電路950。指紋讀出電路903可用來從指紋感測畫素讀出指紋感測訊號,並可透過抗負載驅動電路950來施加抗負載驅動訊號至指紋感測畫素的導線上。觸控顯示驅動整合電路902及指紋讀出電路903皆可以是實現於晶片中的積體電路,此二晶片可共同運作以控制顯示面板804的顯示、觸控感測及指紋感測操作。在觸控顯示驅動整合電路902及指紋讀出電路903之間設置有一介面,用來傳送必要訊息,例如施加抗負載驅動訊號的通知以及用來同步顯示驅動、觸控感測及指紋感測操作的資訊。關於顯示系統90的詳細運作方式類似於上述顯示系統80的運作方式,為求簡化,在此省略而不贅述。
It is worth noting that the implementation of the fingerprint touch display integrated
指紋觸控顯示整合電路802或指紋讀出電路903中的抗負載驅動電路可透過各種方式來實現。請參考第10圖,第10圖為本創作實施例一抗負載驅動電路1000之示意圖。如第10圖所示,抗負載驅動電路1000包含有一電壓產生器1002、一抗負載驅動產生器1004及一耦合電容CC。電壓產生器1002係用來產生一電壓VH,電壓VH可以是任何可能的電壓,例如提供予控制訊號線的控制電壓或提供予電壓源線的電源電壓。抗負載驅動產生器1004可用來產生一原始抗負載驅動訊號ALDX。原始抗負載驅動訊號ALDX可以是一週期訊號,其可具有任何類型的脈衝,如弦波、方波、三角波或梯形波等。透過耦合電容CC,原始抗負載驅動訊號ALDX可被耦合至抗負載驅動電路1000的輸出端,並攜帶於電壓VH的準位上,由抗負載驅動電路1000加以輸出,如第10圖所示。
The anti-load driving circuit in the fingerprint touch display integrated
第11A圖繪示抗負載驅動產生器1004的一種詳細實施方式。如第11A圖所示,抗負載驅動產生器1004包含有穩壓器1102及1104、電容C1及C2以及一開關器模組1110。穩壓器1102可用來產生並輸出一電壓V1,而穩壓器1104可用來產生並輸出一電壓V2,其中,電壓V1的數值以適當的差距高於電壓V2的數值。電容C1及C2分別耦接於穩壓器1102及1104的輸出端,用來改善電壓V1及V2的穩定度。開關器模組1110可接收電壓V1及V2,並藉由開關器的控制來交替輸出電壓V1及V2,以產生原始抗負載驅動訊號ALDX。在此例中,原始抗負載驅動訊號ALDX可以是在電壓V1及V2的準位之間切換的方波訊號。
FIG. 11A shows a detailed implementation of the
第11B圖繪示抗負載驅動產生器1004的另一種實施方式。如第11B圖所示,抗負載驅動產生器1004包含有一數位類比轉換器(Digital-to-Analog Converter,DAC)1150。數位類比轉換器1150可接收一數位碼DIG序列,同時將數位碼DIG轉換為類比電壓,以對應產生並輸出原始抗負載驅動訊號ALDX。在此例中,原始抗負載驅動訊號ALDX可根據所接收的數位碼DIG的不同而具有任何可行的波形。
FIG. 11B shows another embodiment of the
如上所述,抗負載驅動電路可包含在例如第8圖所示的指紋觸控顯示整合電路802中,或者包含在例如第9圖所示的指紋讀出電路903中。在另一實施例中,一抗負載驅動電路亦可實作在顯示面板的指紋感測器內。請參考第12圖,第12圖為本創作實施例另一顯示系統1200之示意圖。顯示系統1200的電路結構類似於顯示系統80的電路結構,故功能相似的訊號或元件皆以相同符號表示。如第12圖所示,顯示系統1200與顯示系統80的不同之處在於,在顯示系統1200中,抗負載驅動電路1250實作在顯示面板804上的指紋感測器中。抗負載驅動電
路1250耦接於指紋感測畫素陣列,並藉由從指紋觸控顯示整合電路802接收的一控制訊號CTRL來進行操作。舉例來說,抗負載驅動電路1250可具有類似於第10圖之抗負載驅動電路1000的結構,其中,當抗負載驅動產生器1004收到控制訊號CTRL以進行啟用或觸發時,即可輸出原始抗負載驅動訊號ALDX。或者,控制訊號CTRL可以是原始抗負載驅動訊號ALDX,其可用來驅動抗負載驅動電路1250以在一預定電壓準位上輸出抗負載驅動訊號。
As described above, the anti-load driving circuit may be included in, for example, the fingerprint touch display integrated
在另一實施例中,將抗負載驅動電路包含在指紋感測器內的設置方式亦可結合如第9圖所示的具有一指紋讀出電路及一觸控顯示驅動整合電路之雙晶片結構,其運作方式類似於前述段落的說明,在此不贅述。 In another embodiment, the arrangement of including the anti-load driving circuit in the fingerprint sensor can also be combined with the dual-chip structure with a fingerprint reading circuit and a touch display driving integrated circuit as shown in Figure 9 , Its operation is similar to the description in the previous paragraph, so I won’t repeat it here.
另外需注意的是,本創作的實施例之目的在於提供一種用於光學式指紋感測器的控制方法及其相關的控制電路和光學式指紋感測器。本領域具通常知識者當可據以進行修飾或變化,而不限於此。本領域具通常知識者應熟知,顯示面板的指紋感測層上可能具有各種類型的畫素結構,而本說明書所描述的畫素結構僅為指紋感測畫素各種實施方式的其中一種。舉例來說,亦可在光電元件及儲存電容之間設置額外的開關器,以藉由控制此開關器的運作來調整曝光時間。在此情況下,抗負載驅動訊號應根據指紋感測畫素的結構來進行施加。 In addition, it should be noted that the purpose of the embodiments of this creation is to provide a control method for an optical fingerprint sensor and its related control circuit and optical fingerprint sensor. Those with ordinary knowledge in the field can make modifications or changes accordingly, but not limited to this. Those with ordinary knowledge in the art should be well aware that the fingerprint sensing layer of the display panel may have various types of pixel structures, and the pixel structure described in this specification is only one of various implementations of fingerprint sensing pixels. For example, an additional switch can be set between the photoelectric element and the storage capacitor to adjust the exposure time by controlling the operation of the switch. In this case, the anti-load driving signal should be applied according to the structure of the fingerprint sensing pixel.
除此之外,第4圖所示的關於列(水平)控制訊號線、行(垂直)感測線、以及行(垂直)電壓源線的設置方式僅為本創作眾多實施方式的其中一種。在另一實施例中,亦可將感測線及電壓源線沿著水平方向設置,並將控制訊號線沿著垂直方向設置;或者,部分控制訊號線可沿著水平方向設置而其它控制訊號線可沿著垂直方向設置。用於指紋感測畫素的列/行控制電路即可對 應進行設置,舉例來說,若感測線為沿著水平方向設置的列感測線時,列控制電路可包含一感測器模組,用來接收感測訊號。關於這些導線及控制電路的設置方式不應用以限制本創作的範疇。 In addition, the arrangement of the column (horizontal) control signal line, the row (vertical) sensing line, and the row (vertical) voltage source line shown in FIG. 4 is only one of the many implementation manners of this creation. In another embodiment, the sensing line and the voltage source line can also be arranged along the horizontal direction, and the control signal line can be arranged along the vertical direction; or part of the control signal line can be arranged along the horizontal direction and other control signal lines Can be set along the vertical direction. The column/row control circuit for fingerprint sensing pixels can It should be set. For example, if the sensing line is a column sensing line arranged along the horizontal direction, the column control circuit may include a sensor module for receiving the sensing signal. The arrangement of these wires and control circuits should not be used to limit the scope of this creation.
再者,施加抗負載驅動訊號至指紋感測畫素的方法亦可應用於整合觸控及指紋感測功能的各類型顯示面板,例如液晶顯示(Liquid Crystal Display,LCD)面板、有機發光二極體(Organic Light-Emitting Diode,OLDE)面板、或電漿顯示面板(Plasma Display Panel,PDP)等。對於液晶顯示面板而言,抗負載驅動操作可應用於內嵌式(in-cell或on-cell)或外掛式(out-cell)液晶顯示面板。需注意的是,抗負載驅動訊號更適用於具有指紋感測功能的內嵌式觸控面板,這是因為內嵌式的結構中觸控感測層與指紋感測層更加接近,但其實施方式不應以此為限。 Furthermore, the method of applying anti-load driving signals to fingerprint sensing pixels can also be applied to various types of display panels that integrate touch and fingerprint sensing functions, such as liquid crystal display (LCD) panels and organic light emitting diodes. Body (Organic Light-Emitting Diode, OLDE) panel, or Plasma Display Panel (PDP), etc. For liquid crystal display panels, the anti-load driving operation can be applied to in-cell or on-cell or out-cell liquid crystal display panels. It should be noted that the anti-load driving signal is more suitable for in-cell touch panels with fingerprint sensing function. This is because the touch-sensing layer and the fingerprint-sensing layer in the in-cell structure are closer, but its implementation The way should not be limited to this.
上述關於光學式指紋感測器及指紋控制電路的運作可歸納為一流程1300,如第13圖所示。流程1300可實現於指紋控制電路或抗負載驅動電路,以應用於與一觸控控制器互相整合且具有多個指紋感測畫素的光學式指紋感測器,其中,每一畫素可包含一第一控制訊號線及一第二控制訊號線,並耦接於一第一電壓源線、一第二電壓源線及一感測線,如第3圖所示的畫素結構。如第13圖所示,流程1300包含有以下步驟:
The above-mentioned operation of the optical fingerprint sensor and the fingerprint control circuit can be summarized as a
步驟1302:開始。 Step 1302: Start.
步驟1304:當觸控控制器處於一觸控操作期間時,第一控制訊號線、第二控制訊號線、第一電壓源線、第二電壓源線、感測線以上當中至少之一者施加一抗負載驅動訊號。 Step 1304: When the touch controller is in a touch operation period, at least one of the first control signal line, the second control signal line, the first voltage source line, the second voltage source line, and the sensing line applies a Anti-load drive signal.
步驟1306:結束。 Step 1306: End.
需注意的是,在第一控制訊號線、第二控制訊號線、第一電壓源線、第二電壓源線、感測線當中未施加抗負載驅動訊號者可控制其處於浮空狀態。進一步地,指紋控制電路亦可採用以浮空或浮接為主的控制方式,如第14圖之流程1400所示,其中,流程1400包含有以下步驟:
It should be noted that, among the first control signal line, the second control signal line, the first voltage source line, the second voltage source line, and the sensing line, those without an anti-load driving signal can be controlled to be in a floating state. Further, the fingerprint control circuit can also adopt a control method based on floating or floating, as shown in the
步驟1402:開始。 Step 1402: Start.
步驟1404:當觸控控制器處於一觸控操作期間時,第一控制訊號線、第二控制訊號線、第一電壓源線、第二電壓源線、感測線全部處於浮空狀態。 Step 1404: When the touch controller is in a touch operation period, the first control signal line, the second control signal line, the first voltage source line, the second voltage source line, and the sensing line are all in a floating state.
步驟1406:結束。 Step 1406: End.
關於流程1300及1400的詳細實施方式及變化方式可參見前述段落的說明,在此不贅述。
For the detailed implementation and variation of the
綜上所述,本創作的實施例提供了一種可用於光學式指紋感測器的控制方法及其控制電路和光學式指紋感測器。光學式指紋感測器可整合於一觸控面板,其中,觸控感測層及指紋感測層當中的一層可疊合在另一層上,且兩層彼此接近,使得觸控感測層與指紋感測層之間的耦合電容造成龐大的電容性負載。在觸控操作期間內,觸控訊號會在指紋感測畫素的導線上形成電容性負載。為了消除或降低電容性負載,可將一抗負載驅動訊號施加在指紋感測畫素的導線上。抗負載驅動訊號可用來驅動此導線,其中,抗負載驅動訊號的頻率、相位及/或振幅實質上分別相同於觸控訊號的頻率、相位及/或振幅。可替換地或額外地,抗負載驅動操作亦可藉由控制指紋感測畫素的目標節點進入浮空狀態來實現。抗負載驅動操作可在觸控控制器的觸控操作期間及/或光學式指 紋感測器的曝光期間內執行。指紋感測畫素中用來接收抗負載驅動訊號的導線可包含直接耦接至畫素中的儲存電容的導線以及透過一電晶體耦接至儲存電容的導線。在抗負載驅動操作之下,儲存電容兩端的電壓將免於受到觸控訊號的干擾,進而維持指紋感測訊號的正確性。 In summary, the embodiments of the present creation provide a control method and control circuit that can be used for an optical fingerprint sensor, and an optical fingerprint sensor. The optical fingerprint sensor can be integrated into a touch panel, wherein one of the touch sensing layer and the fingerprint sensing layer can be superimposed on the other, and the two layers are close to each other, so that the touch sensing layer and The coupling capacitance between the fingerprint sensing layers causes a huge capacitive load. During the touch operation, the touch signal will form a capacitive load on the wire of the fingerprint sensing pixel. In order to eliminate or reduce the capacitive load, an anti-load driving signal can be applied to the wire of the fingerprint sensing pixel. The anti-load driving signal can be used to drive the wire, wherein the frequency, phase and/or amplitude of the anti-load driving signal are substantially the same as the frequency, phase and/or amplitude of the touch signal, respectively. Alternatively or additionally, the anti-load driving operation can also be achieved by controlling the target node of the fingerprint sensing pixel to enter a floating state. The anti-load drive operation can be performed during the touch operation of the touch controller and/or the optical finger The pattern sensor is executed during the exposure period. The wire used for receiving the anti-load driving signal in the fingerprint sensing pixel may include a wire directly coupled to the storage capacitor in the pixel and a wire coupled to the storage capacitor through a transistor. Under the anti-load driving operation, the voltage across the storage capacitor will be free from interference from the touch signal, thereby maintaining the accuracy of the fingerprint sensing signal.
以上所述僅為本創作之較佳實施例,凡依本創作申請專利範圍所做之均等變化與修飾,皆應屬本創作之涵蓋範圍。 The above descriptions are only the preferred embodiments of this creation, and all equal changes and modifications made in accordance with the scope of the patent application for this creation should fall within the scope of this creation.
PD:光電元件 PD: Optoelectronics
SC:儲存電容 SC: storage capacitor
T1~T3:電晶體 T1~T3: Transistor
SVSS:第一電壓源線 SVSS: the first voltage source line
SVDD:第二電源電壓 SVDD: second power supply voltage
R_SW1~R_SW3:控制訊號線 R_SW1~R_SW3: Control signal line
C_SEN:感測線 C_SEN: Sensing line
N1,N2:節點 N1, N2: Node
CC1,CC2:耦合電容 CC1, CC2: Coupling capacitor
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US11308306B2 (en) | 2015-08-19 | 2022-04-19 | Novatek Microelectronics Corp. | Control method for optical fingerprint sensor and related control circuit |
US11656716B2 (en) | 2015-08-19 | 2023-05-23 | Novatek Microelectronics Corp. | Control method for optical fingerprint sensor and touch controller |
TWI764210B (en) * | 2019-07-24 | 2022-05-11 | 聯詠科技股份有限公司 | Control method for optical fingerprint sensor and related control circuit |
US11709565B2 (en) | 2020-12-23 | 2023-07-25 | Novatek Microelectronics Corp. | Fingerprint sensing apparatus, fingerprint readout circuit, and touch display panel |
TWI814189B (en) * | 2020-12-23 | 2023-09-01 | 聯詠科技股份有限公司 | Fingerprint sensing apparatus, fingerprint readout circuit, and touch display panel |
TWI750991B (en) * | 2021-01-07 | 2021-12-21 | 友達光電股份有限公司 | Sensor |
CN113837135A (en) * | 2021-01-07 | 2021-12-24 | 友达光电股份有限公司 | Sensor device |
CN113837135B (en) * | 2021-01-07 | 2023-05-16 | 友达光电股份有限公司 | Sensor device |
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TW202105156A (en) | 2021-02-01 |
CN112287747A (en) | 2021-01-29 |
TWI764210B (en) | 2022-05-11 |
CN212302499U (en) | 2021-01-05 |
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