TW201809996A - Touch sensing unit and fingerprint touch device having the touch sensing unit - Google Patents
Touch sensing unit and fingerprint touch device having the touch sensing unit Download PDFInfo
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- G—PHYSICS
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- 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
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Abstract
一種指紋觸控裝置包括：多條讀取線、多條掃描線、掃描驅動電路、處理電路及多個觸控感測單元。掃描驅動電路電性耦接此些掃描線。處理電路電性耦接此些讀取線。每一觸控感測單元包括：金屬電極、第一電晶體及第二電晶體。第一電晶體具有第一端、第二端及第一控制端，第一控制端及第一端電性耦接此些掃描線中之第一掃描線，而第二端電性耦接金屬電極。第二電晶體具有一第三端、一第四端及一第二控制端，第二控制端電性耦接金屬電極，第三端電性耦接此些讀取線之第一讀取線，而第四端電性耦接此些掃描線中之一第二掃描線。A fingerprint touch device includes: a plurality of reading lines, a plurality of scanning lines, a scanning driving circuit, a processing circuit, and a plurality of touch sensing units. The scan driving circuit is electrically coupled to the scan lines. The processing circuit is electrically coupled to the read lines. Each touch sensing unit includes: a metal electrode, a first transistor and a second transistor. The first transistor has a first terminal, a second terminal, and a first control terminal. The first control terminal and the first terminal are electrically coupled to a first scan line of the scan lines, and the second terminal is electrically coupled to a metal. electrode. The second transistor has a third terminal, a fourth terminal, and a second control terminal. The second control terminal is electrically coupled to the metal electrode, and the third terminal is electrically coupled to the first read lines of the read lines. And the fourth terminal is electrically coupled to one of the scan lines and the second scan line.
Description
本發明是有關於一種觸控面板，特別是一種觸控感測單元及具有該觸控感測單元的指紋觸控裝置。The present invention relates to a touch panel, in particular to a touch sensing unit and a fingerprint touch device having the touch sensing unit.
觸控面板可依其偵測觸控點的物理原理，主要分為電阻式(resistive)觸控面板及電容式(capacitive)觸控面板兩種。電阻式觸控面板係用手指或觸控筆輕按就會產生電壓；而電容式觸控面板係以手指接觸面板而吸取微小的電流方式操作。其中，目前又以電容式觸控面板較為廣泛使用。According to the physical principle of detecting touch points, touch panels are mainly divided into two types: resistive touch panels and capacitive touch panels. Resistive touch panels use a finger or a stylus to lightly generate voltage. Capacitive touch panels operate by touching a panel with a finger and drawing a small amount of current. Among them, capacitive touch panels are currently widely used.
再者，電容式觸控面板又以自感或互感的方式來偵測觸控事件。互感的方式是使用具有偵測出X方向的座標之第一電極，以及用以偵測出Y方向的座標之第二電極，並需經過第一電極與第二電極搭配以完成偵測。而自感的方式則是經由每一電極本身的電壓傳送與接收來完成偵測。由於，在施加有電壓之電極上形成電場，此時，若以手指等碰觸時，接觸位置經由人體的靜電電容而接地。結果會在電極的端子與接觸位置之間產生電容值的變化，進而取得觸控位置的座標。Furthermore, the capacitive touch panel detects touch events in a self-inductive or mutual-inductive manner. The mutual inductance method is to use a first electrode having coordinates in the X direction and a second electrode to detect coordinates in the Y direction, and the first electrode and the second electrode must be matched to complete the detection. The self-induction method is to complete the detection through the voltage transmission and reception of each electrode itself. Since an electric field is formed on an electrode to which a voltage is applied, at this time, if a finger is touched, the contact position is grounded through the electrostatic capacitance of the human body. As a result, a capacitance change occurs between the terminal of the electrode and the contact position, and the coordinates of the touch position are obtained.
不同於習知觸控面板的架構，本發明之一目的在提供一種觸控感測單元，包括：金屬電極、第一電晶體及第二電晶體。第一電晶體具有第一端、第二端及第一控制端，第一控制端及第一端電性耦接第一掃描線，而第二端電性耦接金屬電極。第二電晶體具有第三端、第四端及第二控制端，第二控制端電性耦接金屬電極，第三端電性耦接讀取線，而第四端電性耦接第二掃描線。Different from the conventional touch panel architecture, an object of the present invention is to provide a touch sensing unit, which includes a metal electrode, a first transistor, and a second transistor. The first transistor has a first terminal, a second terminal, and a first control terminal. The first control terminal and the first terminal are electrically coupled to the first scan line, and the second terminal is electrically coupled to the metal electrode. The second transistor has a third terminal, a fourth terminal, and a second control terminal. The second control terminal is electrically coupled to the metal electrode, the third terminal is electrically coupled to the read line, and the fourth terminal is electrically coupled to the second terminal. Scan line.
本發明之一實施例提供具有前述觸控感測單元的指紋觸控裝置，包括：多條讀取線、多條掃描線、掃描驅動電路、處理電路及多個觸控感測單元。掃描驅動電路電性耦接此些掃描線。處理電路電性耦接此些讀取線。多個觸控感測單元，其中每一觸控感測單元包括：金屬電極、第一電晶體及第二電晶體。第一電晶體具有第一端、第二端及第一控制端，第一控制端及第一端電性耦接此些掃描線中之第一掃描線，而第二端電性耦接金屬電極。第二電晶體具有第三端、第四端及第二控制端，第二控制端電性耦接金屬電極，第三端電性耦接此些讀取線之第一讀取線，而第四端電性耦接此些掃描線中之第二掃描線。An embodiment of the present invention provides a fingerprint touch device having the aforementioned touch sensing unit, including: a plurality of reading lines, a plurality of scanning lines, a scan driving circuit, a processing circuit, and a plurality of touch sensing units. The scan driving circuit is electrically coupled to the scan lines. The processing circuit is electrically coupled to the read lines. A plurality of touch sensing units, each of which includes a metal electrode, a first transistor, and a second transistor. The first transistor has a first terminal, a second terminal, and a first control terminal. The first control terminal and the first terminal are electrically coupled to a first scan line of the scan lines, and the second terminal is electrically coupled to a metal. electrode. The second transistor has a third terminal, a fourth terminal, and a second control terminal. The second control terminal is electrically coupled to the metal electrode, and the third terminal is electrically coupled to the first read lines of these read lines. The four terminals are electrically coupled to a second scan line of the scan lines.
本發明之一實施例提供另一種觸控感測單元，包括：金屬電極、第一電晶體及第二電晶體。第一電晶體具有第一端、第二端及第一控制端，第一控制端電性耦接第一掃描線，第一端電性耦接預設電壓，而第二端電性耦接金屬電極。第二電晶體具有第三端、第四端及第二控制端，第二控制端電性耦接金屬電極，第三端電性耦接讀取線，而第四端電性耦接第二掃描線。An embodiment of the present invention provides another touch sensing unit, including a metal electrode, a first transistor, and a second transistor. The first transistor has a first terminal, a second terminal, and a first control terminal. The first control terminal is electrically coupled to the first scan line, the first terminal is electrically coupled to a preset voltage, and the second terminal is electrically coupled. Metal electrode. The second transistor has a third terminal, a fourth terminal, and a second control terminal. The second control terminal is electrically coupled to the metal electrode, the third terminal is electrically coupled to the read line, and the fourth terminal is electrically coupled to the second terminal. Scan line.
本發明之一實施例又提供一種指紋觸控裝置，包括：多條讀取線、多條掃描線、掃描驅動電路、處理電路及多個觸控感測單元。掃描驅動電路電性耦接此些掃描線。處理電路電性耦接此些讀取線。多個觸控感測單元，其中每一觸控感測單元包括：金屬電極、第一電晶體及第二電晶體。第一電晶體具有一第一端、第二端及第一控制端，第一控制端電性耦接此些掃描線中之第一掃描線，第一端電性耦接預設電壓，而第二端電性耦接金屬電極。第二電晶體具有第三端、第四端及第二控制端，第二控制端電性耦接金屬電極，第三端電性耦接此些讀取線之第一讀取線，而第四端電性耦接此些掃描線中之第二掃描線。An embodiment of the present invention further provides a fingerprint touch device, including: a plurality of read lines, a plurality of scan lines, a scan driving circuit, a processing circuit, and a plurality of touch sensing units. The scan driving circuit is electrically coupled to the scan lines. The processing circuit is electrically coupled to the read lines. A plurality of touch sensing units, each of which includes a metal electrode, a first transistor, and a second transistor. The first transistor has a first terminal, a second terminal, and a first control terminal. The first control terminal is electrically coupled to the first scan line of these scan lines. The first terminal is electrically coupled to a preset voltage, and The second terminal is electrically coupled to the metal electrode. The second transistor has a third terminal, a fourth terminal, and a second control terminal. The second control terminal is electrically coupled to the metal electrode, and the third terminal is electrically coupled to the first read lines of these read lines. The four terminals are electrically coupled to a second scan line of the scan lines.
本發明之一實施例還提供一種指紋觸控裝置，包括：觸控層、掃描驅動電路及處理電路。觸控層包括：多條讀取、多條掃描線及多個觸控感測單元。其中，每一觸控感測單元包括：金屬電極、第一電晶體及第二電晶體。第一電晶體具有第一端、第二端及第一控制端，第一控制端及第一端電性耦接此些掃描線中之第一掃描線，而第二端電性耦接金屬電極。第二電晶體具有第三端、第四端及第二控制端，第二控制端電性耦接金屬電極，第三端電性耦接此些讀取線中之第一讀取線，而第四端電性耦接此些掃描線中之第二掃描線。掃描驅動電路電性耦接此些掃描線。處理電路電性耦接此些讀取線，處理電路透過第一讀取線讀取觸控感測單元之感測資料。An embodiment of the present invention further provides a fingerprint touch device, including a touch layer, a scan driving circuit, and a processing circuit. The touch layer includes: multiple readings, multiple scanning lines, and multiple touch sensing units. Each touch sensing unit includes: a metal electrode, a first transistor and a second transistor. The first transistor has a first terminal, a second terminal, and a first control terminal. The first control terminal and the first terminal are electrically coupled to a first scan line of the scan lines, and the second terminal is electrically coupled to a metal. electrode. The second transistor has a third terminal, a fourth terminal, and a second control terminal. The second control terminal is electrically coupled to the metal electrode, and the third terminal is electrically coupled to the first read line of these read lines. The fourth terminal is electrically coupled to the second scan line of the scan lines. The scan driving circuit is electrically coupled to the scan lines. The processing circuit is electrically coupled to these read lines, and the processing circuit reads the sensing data of the touch sensing unit through the first read line.
本發明的指紋觸控裝置中每一觸控感測單元包括金屬電極、第一電晶體及第二電晶體的電路結構，利用波峰所形成的感應電容釋放的電荷量會大於手指的波谷所形成的感應電容釋放的電荷量，而在每一列觸控感測單元的感測資料會在下一級掃描線的致能期間藉由處理電路分別透過讀取線讀取感測資料。因此，指紋觸控裝置能偵測是否發生指紋接觸事件，並根據感測資料建構成的資料畫面得到指紋圖案。此外，還可藉由增加指紋觸控裝置之觸控層的厚度，而降低耦合電容對指紋觸控裝置電路的干擾。In the fingerprint touch device of the present invention, each touch sensing unit includes a circuit structure of a metal electrode, a first transistor, and a second transistor. The amount of charge released by the sensing capacitor formed by the wave crest is greater than that formed by the wave trough of the finger. The amount of charge released by the sensing capacitor, and the sensing data in each column of the touch sensing unit will read the sensing data through the reading line through the processing circuit during the enabling period of the next scanning line. Therefore, the fingerprint touch device can detect whether a fingerprint contact event occurs, and obtain a fingerprint pattern based on the data screen constructed by the sensing data. In addition, by increasing the thickness of the touch layer of the fingerprint touch device, the interference of the coupling capacitor on the fingerprint touch device circuit can be reduced.
圖1為本發明第一實施例之指紋觸控裝置100的電路圖。請參照圖1，指紋觸控裝置100包括：觸控層50、掃描驅動電路20及處理電路30。觸控層50包括：多條讀取線R1~Rm、多條掃描線G1~Gm及多個觸控感測單元10。呈矩陣排列的感測單元10係分別電性耦接掃描線G1~Gm與讀取線R1~Rm。其中，每一觸控感測單元10包括：金屬電極11、第一電晶體12及第二電晶體13。第一電晶體12具有第一端、第二端及第一控制端，第二電晶體13具有第三端、第四端及第二控制端。第一電晶體12之第一控制端及第一端電性耦接其中一掃描線，第二控制端電性耦接金屬電極11，第二電晶體13之第三端電性耦接其中一讀取線，第二控制端電性耦接金屬電極11，第四端電性耦接下一級的掃描線。FIG. 1 is a circuit diagram of a fingerprint touch device 100 according to a first embodiment of the present invention. Referring to FIG. 1, the fingerprint touch device 100 includes a touch layer 50, a scan driving circuit 20 and a processing circuit 30. The touch layer 50 includes a plurality of read lines R1 to Rm, a plurality of scan lines G1 to Gm, and a plurality of touch sensing units 10. The sensing units 10 arranged in a matrix are electrically coupled to the scanning lines G1 to Gm and the reading lines R1 to Rm, respectively. Each touch sensing unit 10 includes a metal electrode 11, a first transistor 12 and a second transistor 13. The first transistor 12 has a first terminal, a second terminal, and a first control terminal, and the second transistor 13 has a third terminal, a fourth terminal, and a second control terminal. The first control terminal and the first terminal of the first transistor 12 are electrically coupled to one of the scan lines, the second control terminal is electrically coupled to the metal electrode 11, and the third terminal of the second transistor 13 is electrically coupled to one of the scan lines. For the read line, the second control terminal is electrically coupled to the metal electrode 11, and the fourth terminal is electrically coupled to the scan line of the next stage.
接下來，說明指紋觸控裝置100其電路的運作方式，並以第一列第一欄、第二列第一欄及第三列之觸控感測單元10舉例說明。對於第一列第一欄的觸控感測單元10來說，第一電晶體12之第一控制端及第一端電性耦接掃描線中之第一掃描線G1，並第二電晶體13之第三端電性耦接讀取線R1，第四端電性耦接第二掃描線G2，而第二列第一欄的觸控感測單元10之第一電晶體12之第一控制端及第一端電性耦接第二掃描線G2，且第三端電性耦接讀取線R1，第四端電性耦接第三掃描線G3。也就是說，第一列之觸控感測單元10的第二電晶體13之第四端會電性耦接第二列之觸控感測單元10的第一電晶體12之第一控制端及第一端。Next, the operation of the circuit of the fingerprint touch device 100 will be described, and the touch sensing units 10 in the first row, the first column, the second row, the first column, and the third row will be described as examples. For the touch sensing unit 10 in the first column and the first column, the first control terminal and the first terminal of the first transistor 12 are electrically coupled to the first scan line G1 in the scan lines, and the second transistor The third terminal of 13 is electrically coupled to the read line R1, the fourth terminal is electrically coupled to the second scan line G2, and the first column of the first transistor 12 of the touch sensing unit 10 in the second column is first The control terminal and the first terminal are electrically coupled to the second scan line G2, the third terminal is electrically coupled to the read line R1, and the fourth terminal is electrically coupled to the third scan line G3. That is, the fourth terminal of the second transistor 13 of the touch sensing unit 10 in the first row is electrically coupled to the first control terminal of the first transistor 12 of the touch sensing unit 10 in the second row. And the first end.
圖2繪示為圖1之顯示面板的訊號時序圖。接下來，請合併參照圖1及圖2，掃描驅動電路20提供第一掃描脈衝P1至第一掃描線G1及提供第二掃描脈衝P2至第二掃描線G2，且第一掃描脈衝P1的致能期間與第二掃描脈衝P2的致能期間不重疊。詳言之，每一級掃描線的掃描脈衝的致能期間在前一級掃描線的掃描脈衝之後，並且每一級掃描線的掃描脈衝不會與前一級掃描線的掃描脈衝重疊。FIG. 2 is a signal timing diagram of the display panel of FIG. 1. Next, please refer to FIG. 1 and FIG. 2 together. The scan driving circuit 20 provides a first scan pulse P1 to a first scan line G1 and a second scan pulse P2 to a second scan line G2. The energy period does not overlap with the enabling period of the second scan pulse P2. In detail, the enabling period of the scanning pulse of each scanning line is after the scanning pulse of the previous scanning line, and the scanning pulse of each scanning line does not overlap with the scanning pulse of the previous scanning line.
當掃描驅動電路20提供第一掃描脈衝P1至第一掃描線G1，第一電晶體12導通而施加電壓到金屬電極11進而導通第二電晶體13。在此假設手指是以波谷接觸到第一列第一欄的觸控感測單元10，則通過金屬電極11的電壓會對經由接觸位置通過人體而接地所響應的感應電容充電，然而此時因第二掃描線G2為低準位，又第二電晶體13的源極係耦接至第二掃描線G2，以致於由第二電晶體13之閘極流向汲極至讀取線R1的電流極微小甚至可忽略。When the scan driving circuit 20 provides the first scan pulse P1 to the first scan line G1, the first transistor 12 is turned on and a voltage is applied to the metal electrode 11 to further turn on the second transistor 13. It is assumed here that the finger touches the touch sensing unit 10 in the first column and the first column with a trough. The voltage through the metal electrode 11 will charge the inductive capacitor that responds to the ground through the human body through the contact position. The second scan line G2 is at a low level, and the source of the second transistor 13 is coupled to the second scan line G2, so that the current flowing from the gate of the second transistor 13 to the drain to the read line R1 Very tiny and even negligible.
接著，當掃描驅動電路20提供第二掃描脈衝P2至第二掃描線G2，在第二掃描線G2致能的期間，第一列第一欄的觸控感測單元10的第二電晶體13之源極雖為高準位，但由於手指是以波谷接觸到第一列第一欄的觸控感測單元10，因而其感應電容所充的電荷值不足以導通第一列第一欄的第二電晶體13，因而處理電路30透過讀取線R1所讀取之感測資料近乎等於零電流。Next, when the scan driving circuit 20 provides the second scan pulse P2 to the second scan line G2, during the period when the second scan line G2 is enabled, the second transistor 13 of the touch sensing unit 10 in the first column and the first column is enabled. Although the source electrode is at a high level, since the finger touches the touch sensing unit 10 in the first column and the first column through the trough, the charge value of its sensing capacitor is not enough to conduct the first column in the first column. The second transistor 13 and therefore the sensing data read by the processing circuit 30 through the read line R1 are almost equal to zero current.
此時，假設手指是以波峰接觸到第二列第一欄的觸控感測單元10，當第一電晶體12受第二掃描脈衝P2導通而施加電壓到金屬電極11並導通第二電晶體13時，則通過金屬電極11的電壓對所響應的感應電容充電，然而此時因第三掃描線G3為低準位，又第二電晶體13的源極係耦接至第三掃描線G3，以致於由第二電晶體13之閘極流向汲極至讀取線R1的電流極微小甚至可忽略。At this time, it is assumed that the finger touches the touch sensing unit 10 in the second column and the first column with a wave crest. When the first transistor 12 is turned on by the second scan pulse P2, a voltage is applied to the metal electrode 11 and the second transistor is turned on. At 13 o'clock, the response induction capacitor is charged by the voltage of the metal electrode 11. However, because the third scanning line G3 is at a low level at this time, the source of the second transistor 13 is coupled to the third scanning line G3. , So that the current flowing from the gate of the second transistor 13 to the drain to the read line R1 is extremely small or even negligible.
接著，當掃描驅動電路20提供掃描脈衝P3至第三掃描線G3時，在第三掃描線G3致能的期間，第二列第一欄的觸控感測單元10的第二電晶體13之源極為高準位，且由於手指是以波峰接觸到第二列第一欄的觸控感測單元10，因而其感應電容所充的電荷值將足以導通第二列第一欄的第二電晶體13而放電，此時處理電路30得以透過讀取線R1讀取到第二列第一欄的觸控感測單元10的感測資料，同時第三列的觸控感測單元10之第一電晶體12導通並施加電壓到金屬電極11而導通第二電晶體13進而對所響應的感應電容充電。以此類推，經前述說明，本領域通常知識者應可得知本發明之指紋觸控裝置100的每一列觸控感測單元10的感測資料是在下一級掃描線的致能期間藉由處理電路30分別透過讀取線R1~Rm讀取感測資料。因此，指紋觸控裝置100能偵測是否發生指紋接觸事件，並根據感測資料建構成的資料畫面得到指紋圖案。Next, when the scan driving circuit 20 provides the scan pulses P3 to the third scan line G3, during the period when the third scan line G3 is enabled, one of the second transistors 13 of the touch sensing unit 10 in the second column and the first column. The source is extremely high level, and since the finger touches the touch sensing unit 10 in the first column of the second column with a wave crest, the charge value of its sensing capacitor will be sufficient to turn on the second electrode in the first column of the second column The crystal 13 is discharged. At this time, the processing circuit 30 can read the sensing data of the touch sensing unit 10 in the second column and the first column through the read line R1. A transistor 12 is turned on and a voltage is applied to the metal electrode 11 to turn on the second transistor 13 to charge the response induction capacitor. By analogy, after the foregoing description, a person of ordinary skill in the art should know that the sensing data of each row of the touch sensing units 10 of the fingerprint touch device 100 of the present invention is processed during the enabling period of the next scanning line. The circuit 30 reads the sensing data through the read lines R1 to Rm, respectively. Therefore, the fingerprint touch device 100 can detect whether a fingerprint contact event occurs, and obtain a fingerprint pattern based on the data screen constructed by the sensing data.
進一步說明，圖3為當本發明一實施例之指紋觸控裝置發生指紋接觸事件時的示意圖。請參照圖3，基於公式(1)Q=C*V，其中Q為儲存在電容器電極的電荷量，以及公式(2)C=εA/d，其中ε是介電質的電容率，A是平板的面積，而d是二平行板間隔的距離，因此可推論得知，由手指的波峰所形成的感應電容Cf將會大於手指的波谷所形成的感應電容Cf，並且波峰所形成的感應電容Cf釋放的電荷量會大於手指的波谷所形成的感應電容Cf釋放的電荷量。To further explain, FIG. 3 is a schematic diagram when a fingerprint touch event occurs on a fingerprint touch device according to an embodiment of the present invention. Referring to Figure 3, based on the formula (1) Q = C * V, where Q is the amount of charge stored in the capacitor electrode, and formula (2) C = εA / d, where ε is the permittivity of the dielectric, and A is The area of the flat plate, and d is the distance between the two parallel plates. Therefore, it can be inferred that the induction capacitance Cf formed by the wave crest of the finger will be larger than the induction capacitance Cf formed by the wave trough of the finger, and the induction capacitance formed by the wave crest. The amount of charge released by Cf will be greater than the amount of charge released by the inductive capacitor Cf formed by the valley of the finger.
圖4為本發明第二實施例之指紋觸控裝置200的電路圖。請參照圖4，第二實施例之指紋觸控裝置200與第一實施例之指紋觸控裝置100不同之處在於，第一實施例之觸控感測單元10的第一電晶體12之第一控制端及第一端電性耦接同一條掃描線，而第二實施例之觸控感測單元10B的第一電晶體12之第一控制端分別電性耦接至掃描線，第一端電性耦接預設電壓VSET 。其中，預設電壓VSET 可以是由處理電路30提供的直流準位，且預設電壓VSET 的準位為大於或等於掃描脈衝的致能準位。由於第二實施例之指紋觸控裝置200與第一實施例之指紋觸控裝置100之電路運作原理大致相同，在此不再贅述。FIG. 4 is a circuit diagram of a fingerprint touch device 200 according to a second embodiment of the present invention. Please refer to FIG. 4. The fingerprint touch device 200 of the second embodiment is different from the fingerprint touch device 100 of the first embodiment in that the first touch transistor 12 of the touch sensing unit 10 of the first embodiment A control terminal and a first terminal are electrically coupled to the same scan line, and a first control terminal of the first transistor 12 of the touch sensing unit 10B of the second embodiment is electrically coupled to the scan line, respectively. The terminal is electrically coupled to a preset voltage V SET . The preset voltage V SET may be a DC level provided by the processing circuit 30, and the level of the preset voltage V SET is greater than or equal to an enable level of the scan pulse. Since the circuit operation principle of the fingerprint touch device 200 of the second embodiment is substantially the same as that of the fingerprint touch device 100 of the first embodiment, details are not described herein again.
值得一提的是，藉由公式(2)可知，手指之波峰與波谷所響應的感應電容的大小會與指紋觸控裝置100/200所搭配之觸控層50的厚度有關。在第一實施例之指紋觸控裝置100中，若觸控層50的厚度增加，則需拉高掃描驅動電路所提供的掃描脈衝之致能準位，以致於使通過第一電晶體12而施加到金屬電極11的電壓對感應電容充電後，仍可維持於波峰所形成的感應電容Cf釋放的電荷量能導通第二電晶體13，而波谷所形成的感應電容Cf釋放的電荷量不足以導通第二電晶體13。It is worth mentioning that according to formula (2), the magnitude of the sensing capacitors responded to the peaks and troughs of the fingers is related to the thickness of the touch layer 50 of the fingerprint touch device 100/200. In the fingerprint touch device 100 of the first embodiment, if the thickness of the touch layer 50 is increased, the enable level of the scan pulse provided by the scan driving circuit needs to be increased, so that the first transistor 12 and the After the voltage applied to the metal electrode 11 charges the induction capacitor, the amount of charge released by the induction capacitor Cf formed by the wave peak can be conducted to the second transistor 13, and the amount of charge released by the induction capacitor Cf formed by the wave valley is insufficient. Turn on the second transistor 13.
特別注意的是，在第二實施例之指紋觸控裝置200中，若觸控層50的厚度增加，則僅需拉高預設電壓VSET 的直流準位，以致於使通過第一電晶體12而施加到金屬電極11的電壓對感應電容充電後，仍可維持於波峰所形成的感應電容Cf釋放的電荷量能導通第二電晶體13，而波谷所形成的感應電容Cf釋放的電荷量不足以導通第二電晶體13。並且，在第二實施例之指紋觸控裝置200中，可降低掃描驅動電路所提供的掃描脈衝之致能準位而節省電力消耗，掃描脈衝之致能準位只要能導通第一電晶體12即可。其中，觸控層50包括玻璃蓋板，當觸控層50的厚度增加，則產生於感測單元的耦合電容愈小，進而降低對指紋觸控裝置電路的干擾。It is particularly noted that, in the fingerprint touch device 200 of the second embodiment, if the thickness of the touch layer 50 is increased, only the DC level of the preset voltage V SET needs to be increased, so that the first transistor passes 12 and the voltage applied to the metal electrode 11 charges the induction capacitor, the amount of charge released by the induction capacitor Cf formed by the wave peak can be conducted to the second transistor 13, and the amount of charge released by the induction capacitor Cf formed by the wave valley Not enough to turn on the second transistor 13. Moreover, in the fingerprint touch device 200 of the second embodiment, the enabling level of the scanning pulse provided by the scanning driving circuit can be reduced and power consumption can be saved. The enabling level of the scanning pulse only needs to turn on the first transistor 12 Just fine. The touch layer 50 includes a glass cover. When the thickness of the touch layer 50 increases, the smaller the coupling capacitance generated by the sensing unit is, the lower the interference to the fingerprint touch device circuit is.
圖5為本發明一實施態樣之指紋觸控裝置300的電路圖。請參照圖5，指紋觸控裝置300與前述之指紋觸控裝置100/200不同之處在於，指紋觸控裝置300還包括多個放大電路60分別電性耦接於讀取線R1~Rm及處理電路30之間。放大電路60包括：第一輸入端、第二輸入端及輸出端。第一輸入端電性耦接讀取線，用以接收讀取線讀取之感測資料。第二輸入端電性耦接參考電位。輸出端電性耦接處理電路30。其中，參考電位可為接地電位。藉由將讀取線R1~Rm所讀取的感測資料放大再傳送到處理電路30，指紋觸控裝置300能更準確的偵測是否發生指紋接觸事件，並根據感測資料建構成的資料畫面得到指紋圖案。FIG. 5 is a circuit diagram of a fingerprint touch device 300 according to an embodiment of the present invention. Please refer to FIG. 5. The difference between the fingerprint touch device 300 and the aforementioned fingerprint touch devices 100/200 is that the fingerprint touch device 300 further includes a plurality of amplifier circuits 60 which are electrically coupled to the read lines R1 to Rm and Between processing circuits 30. The amplifier circuit 60 includes a first input terminal, a second input terminal, and an output terminal. The first input terminal is electrically coupled to the read line and used to receive the sensing data read by the read line. The second input terminal is electrically coupled to the reference potential. The output terminal is electrically coupled to the processing circuit 30. The reference potential may be a ground potential. By enlarging the sensing data read by the read lines R1 to Rm and transmitting it to the processing circuit 30, the fingerprint touch device 300 can more accurately detect whether a fingerprint contact event occurs, and construct data based on the sensing data. The screen gets a fingerprint pattern.
圖6為本發明另一實施態樣之指紋觸控裝置的電路圖。請參照圖6，指紋觸控裝置400與第二實施例之指紋觸控裝置200不同之處在於，指紋觸控裝置400中每兩欄的觸控感測單元可連接至相同的預設電壓VSET 線，而能節省佈置線路。換言之，可將奇數欄的觸控感測單元的結構鏡射成偶數欄的觸控感測單元的結構，如此一來，每兩欄的第一電晶體12之第一端可共用預設電壓VSET 。FIG. 6 is a circuit diagram of a fingerprint touch device according to another embodiment of the present invention. Please refer to FIG. 6. The difference between the fingerprint touch device 400 and the fingerprint touch device 200 of the second embodiment is that the touch sensing units of every two columns in the fingerprint touch device 400 can be connected to the same preset voltage V. SET line, which can save the layout. In other words, the structures of the touch sensing units in the odd columns can be mirrored into the structures of the touch sensing units in the even columns, so that the first end of the first transistor 12 in each two columns can share the preset voltage V SET .
本發明的指紋觸控裝置中每一觸控感測單元包括金屬電極、第一電晶體及第二電晶體的電路結構，利用波峰所形成的感應電容釋放的電荷量會大於手指的波谷所形成的感應電容釋放的電荷量，而在每一列觸控感測單元的感測資料會在下一級掃描線的致能期間藉由處理電路分別透過讀取線讀取感測資料。因此，指紋觸控裝置能偵測是否發生指紋接觸事件，並根據感測資料建構成的資料畫面得到指紋圖案。此外，還可藉由增加指紋觸控裝置之觸控層的厚度，而降低耦合電容對指紋觸控裝置電路的干擾。In the fingerprint touch device of the present invention, each touch sensing unit includes a circuit structure of a metal electrode, a first transistor, and a second transistor. The amount of charge released by the sensing capacitor formed by the wave crest is greater than that formed by the wave trough of the finger. The amount of charge released by the sensing capacitor, and the sensing data in each column of the touch sensing unit will read the sensing data through the reading line through the processing circuit during the enabling period of the next scanning line. Therefore, the fingerprint touch device can detect whether a fingerprint contact event occurs, and obtain a fingerprint pattern based on the data screen constructed by the sensing data. In addition, by increasing the thickness of the touch layer of the fingerprint touch device, the interference of the coupling capacitor on the fingerprint touch device circuit can be reduced.
雖然本發明已以較佳實施例揭露如上，然其並非用以限定本發明，任何熟習此技藝者，在不脫離本發明的精神和範圍內，當可作些許的更動與潤飾，因此本發明的保護範圍當視後附之申請專利範圍所界定者為準。Although the present invention has been disclosed in the preferred embodiment as above, it is not intended to limit the present invention. Any person skilled in the art can make some modifications and retouches without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection shall be determined by the scope of the attached patent application.
100、200、300、400‧‧‧指紋觸控裝置
10、10B‧‧‧觸控感測單元
11‧‧‧金屬電極
12、T1‧‧‧第一電晶體
13、T2‧‧‧第二電晶體
20‧‧‧掃描驅動電路
30‧‧‧處理電路
50‧‧‧觸控層
60‧‧‧放大電路
G1~Gm‧‧‧掃描線
R1~Rm‧‧‧讀取線
P1、P2、P3‧‧‧掃描脈衝
Cf‧‧‧感應電容
VSET‧‧‧預設電壓100, 200, 300, 400‧‧‧ fingerprint touch devices
10, 10B‧‧‧Touch sensing unit
11‧‧‧metal electrode
12.T1‧‧‧first transistor
13.T2‧‧‧Second transistor
20‧‧‧scan drive circuit
30‧‧‧Processing circuit
50‧‧‧ touch layer
60‧‧‧amplified circuit
G1 ~ Gm‧‧‧scan line
R1 ~ Rm‧‧‧Read line
P1, P2, P3‧‧‧scan pulse
Cf‧‧‧ Induction Capacitor
V SET ‧‧‧ Preset voltage
圖1為本發明第一實施例之指紋觸控裝置的電路圖。 圖2繪示為圖1之指紋觸控裝置的訊號時序圖。 圖3為當本發明一實施例之指紋觸控裝置發生指紋接觸事件時的示意圖。 圖4為本發明第二實施例之指紋觸控裝置的電路圖。 圖5為本發明一實施態樣之指紋觸控裝置的電路圖。 圖6為本發明另一實施態樣之指紋觸控裝置的電路圖。FIG. 1 is a circuit diagram of a fingerprint touch device according to a first embodiment of the present invention. FIG. 2 is a signal timing diagram of the fingerprint touch device of FIG. 1. FIG. 3 is a schematic diagram when a fingerprint touch event occurs on a fingerprint touch device according to an embodiment of the present invention. FIG. 4 is a circuit diagram of a fingerprint touch device according to a second embodiment of the present invention. FIG. 5 is a circuit diagram of a fingerprint touch device according to an embodiment of the present invention. FIG. 6 is a circuit diagram of a fingerprint touch device according to another embodiment of the present invention.
100‧‧‧指紋觸控裝置 100‧‧‧ Fingerprint Touch Device
10‧‧‧觸控感測單元 10‧‧‧ touch sensing unit
11‧‧‧金屬電極 11‧‧‧metal electrode
12‧‧‧第一電晶體 12‧‧‧The first transistor
13‧‧‧第二電晶體 13‧‧‧Second transistor
20‧‧‧掃描驅動電路 20‧‧‧scan drive circuit
30‧‧‧處理電路 30‧‧‧Processing circuit
50‧‧‧觸控層 50‧‧‧ touch layer
G1~Gm‧‧‧掃描線 G1 ~ Gm‧‧‧scan line
R1~Rm‧‧‧讀取線 R1 ~ Rm‧‧‧Read line
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| CN104182099A (en) * | 2013-05-21 | 2014-12-03 | 友达光电股份有限公司 | Capacitive touch panel |
| TWI563482B (en) * | 2014-10-21 | 2016-12-21 | Ind Tech Res Inst | Driver circuit with device variation compensation and operation method thereof |
| CN205028274U (en) * | 2015-09-23 | 2016-02-10 | 深圳信炜科技有限公司 | Capacitive sensor and capacitive sensor |
-
2016
- 2016-09-08 TW TW105129057A patent/TWI711951B/en not_active IP Right Cessation
-
2017
- 2017-07-24 CN CN201710605989.2A patent/CN107807757B/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI766551B (en) * | 2021-01-20 | 2022-06-01 | 速博思股份有限公司 | Fingerprint-touch sensing apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107807757B (en) | 2021-12-03 |
| CN107807757A (en) | 2018-03-16 |
| TWI711951B (en) | 2020-12-01 |
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