TWI765460B - Analog front end circuit for touch controller and operating method thereof - Google Patents

Analog front end circuit for touch controller and operating method thereof Download PDF

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TWI765460B
TWI765460B TW109143649A TW109143649A TWI765460B TW I765460 B TWI765460 B TW I765460B TW 109143649 A TW109143649 A TW 109143649A TW 109143649 A TW109143649 A TW 109143649A TW I765460 B TWI765460 B TW I765460B
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switch
signal
analog front
period
touch
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TW109143649A
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TW202131154A (en
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陳弘凱
陳育煌
詹豐林
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聯詠科技股份有限公司
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Abstract

An analog front-end circuit for a touch controller and an operating method thereof are provided. The analog front-end circuit includes an analog front-end, a first switch and a second switch. The analog front-end includes an input terminal and an output terminal. The first switch includes a first terminal and a second terminal. The first terminal of the first switch is coupled to the input terminal of the analog front-end, and the second terminal of the first switch is coupled to a panel routing. The second switch includes a first terminal and a second terminal. The first terminal of the second switch is coupled to the second terminal of the first switch, and the second terminal of the second switch is coupled to a reference voltage.

Description

用於觸控控制器的類比前端電路及其操作方法Analog front-end circuit for touch controller and method of operation

本發明是有關於一種觸控控制器中的功能電路，且特別是有關於一種用於觸控控制器的類比前端電路及其操作方法。 The present invention relates to a functional circuit in a touch controller, and more particularly, to an analog front-end circuit for a touch controller and an operation method thereof.

參考圖1，通用觸控控制器的傳統類比前端電路100可包括例如放大器101、電容器102及電阻器103。電容器102及電阻器103分別耦合在放大器101的反相輸入端與放大器101的輸出端之間。對於通用觸控控制器來說，傳統類比前端電路100可用以經由放大器101的反相輸入端接收由觸控感測器提供的觸控信號，且經由放大器101的非反相輸入端接收參考電壓。因此，放大器101可根據觸控信號及參考電壓輸出輸出信號。然而，如果觸控控制器用於從具有顯示面板及觸控面板的顯示觸控模組接收觸控信號，則放大器101可接收由觸控面板提供的觸控信號及來自顯示面板的耦合雜訊信號。換句話說，放大器101所輸出的輸出信號可存在由來自顯示面板的耦合雜訊信號導致的信號畸變問題，因此也可能致使類比前端電路100無效。因此，下文就如何 設計具有一定信噪比的新類比前端電路而提供數個實施例的解決方案。 Referring to FIG. 1 , a conventional analog front-end circuit 100 of a general touch controller may include, for example, an amplifier 101 , a capacitor 102 and a resistor 103 . Capacitor 102 and resistor 103 are coupled between the inverting input terminal of amplifier 101 and the output terminal of amplifier 101, respectively. For a general touch controller, the conventional analog front-end circuit 100 can be used to receive the touch signal provided by the touch sensor via the inverting input terminal of the amplifier 101 and receive the reference voltage via the non-inverting input terminal of the amplifier 101 . Therefore, the amplifier 101 can output the output signal according to the touch signal and the reference voltage. However, if the touch controller is used to receive touch signals from a display touch module having a display panel and a touch panel, the amplifier 101 can receive the touch signals provided by the touch panel and coupled noise signals from the display panel . In other words, the output signal output by the amplifier 101 may have the problem of signal distortion caused by the coupled noise signal from the display panel, so the analog front-end circuit 100 may also be invalid. Therefore, how Designing new analog front-end circuits with a certain signal-to-noise ratio provides solutions for several embodiments.

本發明涉及一種用於觸控控制器的類比前端電路及能夠提供有效的觸控感測功能的類比前端電路操作方法。 The invention relates to an analog front-end circuit for a touch controller and an operation method of the analog front-end circuit capable of providing an effective touch sensing function.

本發明實施例的用於觸控控制器的類比前端電路包括類比前端、第一開關及第二開關。所述類比前端包括輸入端及輸出端。所述第一開關包括第一端及第二端。所述第一開關的所述第一端耦接至所述類比前端的所述輸入端，且所述第一開關的所述第二端耦接至面板佈線。所述第二開關包括第一端及第二端。所述第二開關的所述第一端耦接至所述第一開關的所述第二端，且所述第二開關的所述第二端耦接至參考電壓。 The analog front-end circuit for a touch controller according to an embodiment of the present invention includes an analog front-end, a first switch, and a second switch. The analog front end includes an input end and an output end. The first switch includes a first end and a second end. The first terminal of the first switch is coupled to the input terminal of the analog front end, and the second terminal of the first switch is coupled to panel wiring. The second switch includes a first end and a second end. The first end of the second switch is coupled to the second end of the first switch, and the second end of the second switch is coupled to a reference voltage.

本發明另一實施例的操作方法適於用於觸控控制器的類比前端電路。所述類比前端電路包括類比前端、第一開關及第二開關。所述類比前端的輸入端耦接至所述第一開關的第一端。所述第一開關的第二端耦接至面板佈線且所述第二開關的第一端。所述第二開關的第二端耦接至參考電壓。所述面板佈線還耦接至觸控面板及顯示面板。所述操作方法包括以下步驟：在第一週期期間導通第二開關；在所述第一週期期間，將來自所述顯示面板的耦合雜訊信號經由所述面板佈線及所述第二開關傳送到所述參考電壓；在第二週期期間導通所述第一開關；以及在所述第二週 期期間，由所述類比前端的所述輸入端接收觸控驅動信號。所述第一週期與第二週期未重疊。 The operating method of another embodiment of the present invention is suitable for an analog front-end circuit of a touch controller. The analog front end circuit includes an analog front end, a first switch and a second switch. The input terminal of the analog front end is coupled to the first terminal of the first switch. The second end of the first switch is coupled to the panel wiring and the first end of the second switch. The second end of the second switch is coupled to the reference voltage. The panel wiring is also coupled to the touch panel and the display panel. The operating method includes the steps of: turning on a second switch during a first period; transmitting a coupled noise signal from the display panel to the display panel via the panel wiring and the second switch during the first period. the reference voltage; turning on the first switch during a second period; and during the second period During the period, a touch driving signal is received by the input terminal of the analog front end. The first period and the second period do not overlap.

基於上文，根據本發明的用於所述觸控控制器的所述類比前端電路及其操作方法，在類比前端電路接收觸控驅動信號時，所述類比前端電路可有效地避免或減少接收由顯示面板產生的雜訊信號。 Based on the above, according to the analog front-end circuit for the touch controller and the operation method thereof of the present invention, when the analog front-end circuit receives a touch driving signal, the analog front-end circuit can effectively avoid or reduce the receiving Noise signal generated by the display panel.

為使前述內容更易於理解，如下結合圖式一起詳細地闡述數個實施例。 To make the foregoing easier to understand, several embodiments are described in detail below in conjunction with the drawings.

100:類比前端電路 100: Analog Front-End Circuits

101:放大器 101: Amplifier

102、234:電容器 102, 234: Capacitors

103:電阻器 103: Resistors

200:觸控顯示模組 200: touch display module

210:觸控面板 210: Touch Panel

220:顯示面板 220: Display panel

221、222:多工器 221, 222: Multiplexer

230:像素單元 230: pixel unit

231、232:電晶體 231, 232: Transistor

233:發光單元 233: Lighting unit

300、400、500、600:類比前端電路 300, 400, 500, 600: Analog front-end circuits

310、410、510、610:類比前端 310, 410, 510, 610: Analog Front End

320、420、520、620:第一開關 320, 420, 520, 620: the first switch

330、430、530、630:第二開關 330, 430, 530, 630: Second switch

340、440、540、640:等效電阻 340, 440, 540, 640: Equivalent resistance

350、360、450、460、560、660:等效電容 350, 360, 450, 460, 560, 660: Equivalent capacitance

470、670:第三開關 470, 670: The third switch

A1、A2、A3、A4、A5、A6、A7、A8:節點 A1, A2, A3, A4, A5, A6, A7, A8: Nodes

ELVDD:高電位電源電壓 ELVDD: High potential power supply voltage

ELVSS:低電位電源電壓 ELVSS: Low Potential Supply Voltage

ES:發射信號 ES: transmit signal

HS:水平同步信號 HS: Horizontal Sync Signal

L1、L2、L3、L4:面板佈線 L1, L2, L3, L4: Panel wiring

MS1、MS2:多工器控制信號 MS1, MS2: Multiplexer control signal

NS:耦合雜訊信號 NS: coupled noise signal

P1、P1’:第一週期 P1, P1': the first cycle

P2、P2’:第二週期 P2, P2': the second cycle

S1:第一開關信號 S1: The first switch signal

S2:第二開關信號 S2: The second switch signal

S3:第三開關信號 S3: The third switch signal

S910、S920、S930、S940:步驟 S910, S920, S930, S940: Steps

SL:源極線 SL: source line

TS:觸控驅動信號 TS: touch drive signal

Va、Vb、-Vb:電壓 Va, Vb, -Vb: Voltage

-VDD、+VDD:電源電壓 -VDD, +VDD: Power supply voltage

Vf、Vf1、Vf2:參考電壓 Vf, Vf1, Vf2: reference voltage

Vout1、Vout2:輸出信號 Vout1, Vout2: output signal

圖1為傳統類比前端電路的示意圖。 Figure 1 is a schematic diagram of a conventional analog front-end circuit.

圖2為根據本發明一實施例的觸控顯示模組的示意圖。 FIG. 2 is a schematic diagram of a touch display module according to an embodiment of the present invention.

圖3A為根據本發明一實施例的適用於互容式觸控面板的類比前端電路的示意圖。 3A is a schematic diagram of an analog front-end circuit suitable for a mutual capacitive touch panel according to an embodiment of the present invention.

圖3B為根據本發明一實施例的適用於自容式觸控面板的類比前端電路的示意圖。 3B is a schematic diagram of an analog front-end circuit suitable for a self-capacitive touch panel according to an embodiment of the present invention.

圖4為根據本發明一實施例的類比前端電路的操作的信號波形圖。 4 is a signal waveform diagram illustrating the operation of an analog front-end circuit according to an embodiment of the present invention.

圖5A為根據本發明另一實施例的適用於互容式觸控面板的類比前端電路的示意圖。 5A is a schematic diagram of an analog front-end circuit suitable for a mutual capacitive touch panel according to another embodiment of the present invention.

圖5B為根據本發明另一實施例的適用於自容式觸控面板的 類比前端電路的示意圖。 FIG. 5B is a schematic diagram of a self-capacitive touch panel according to another embodiment of the present invention. Schematic diagram of the analog front-end circuit.

圖6為根據本發明另一實施例的類比前端電路的操作的信號波形圖。 6 is a signal waveform diagram illustrating the operation of an analog front-end circuit according to another embodiment of the present invention.

圖7為根據本發明又一實施例的類比前端電路的操作的信號波形圖。 7 is a signal waveform diagram illustrating the operation of an analog front-end circuit according to yet another embodiment of the present invention.

圖8為根據本發明再一實施例的類比前端電路的操作的信號波形圖。 FIG. 8 is a signal waveform diagram illustrating the operation of an analog front-end circuit according to still another embodiment of the present invention.

圖9為本發明一實施例的操作方法的流程圖。 FIG. 9 is a flowchart of an operating method according to an embodiment of the present invention.

應理解，可利用其他實施例且可做出結構上的改變，而這不背離本發明的範圍。此外，應理解，本文中所使用的措詞及用語是出於說明目的且不應被視為限制性的。本文中使用“包含(including)”、“包括(comprising)”或“具有(having)”及其變化形式意在囊括這些用語之後所列舉的物項及所列舉物項的等效物以及額外物項。除非另有限制，否則用語“連接(connected)”、“耦接(coupled)”及“安裝(mounted)”及其變化形式在本文中廣泛使用且囊括直接及間接的連接、耦接及安裝。 It is to be understood that other embodiments may be utilized and structural changes may be made without departing from the scope of the present invention. Also, it is to be understood that the phraseology and phraseology used herein is for the purpose of description and should not be regarded as limiting. The use of "including", "comprising" or "having" and variations thereof herein is intended to encompass the items recited following these terms and equivalents and additions to the recited items item. Unless otherwise limited, the terms "connected," "coupled," and "mounted" and variations thereof are used broadly herein and encompass both direct and indirect connections, couplings, and mountings.

圖2為根據本發明一實施例的觸控顯示模組的示意圖。參考圖2，本發明的觸控顯示模組200包括觸控面板210及顯示面板220，且觸控面板210設置在顯示面板220上。在本發明實施例 中，觸控面板210包括排列成陣列的多個觸控感測器。在本發明實施例中，觸控面板210可為互容式(Mutual capacitance)觸控面板或自容式(Self capacitance)觸控面板。顯示面板220可以為發光二極體(Light-Emitting Diode，LED)顯示面板、微發光二極體(micro LED)顯示面板、有機發光二極體(Organic Light-Emitting Diode，OLED)顯示面板、液晶顯示器(Liquid-Crystal Display，LCD)面板或其他類型的顯示器面板，且包括排列成陣列的多個像素單元。顯示面板220的像素單元由多條柵極線GL及多條源極線SL驅動，其中源極線SL可進一步耦接至多工器221、222。多工器221、222可分別耦接至相應的兩條源極線，且用以分別且交替地驅動所述相應的兩條源極線。 FIG. 2 is a schematic diagram of a touch display module according to an embodiment of the present invention. Referring to FIG. 2 , the touch display module 200 of the present invention includes a touch panel 210 and a display panel 220 , and the touch panel 210 is disposed on the display panel 220 . In an embodiment of the present invention , the touch panel 210 includes a plurality of touch sensors arranged in an array. In the embodiment of the present invention, the touch panel 210 may be a mutual capacitance touch panel or a self capacitance touch panel. The display panel 220 may be a light-emitting diode (Light-Emitting Diode, LED) display panel, a micro-light-emitting diode (micro LED) display panel, an organic light-emitting diode (Organic Light-Emitting Diode, OLED) display panel, a liquid crystal A display (Liquid-Crystal Display, LCD) panel or other types of display panels includes a plurality of pixel units arranged in an array. The pixel units of the display panel 220 are driven by a plurality of gate lines GL and a plurality of source lines SL, wherein the source lines SL can be further coupled to the multiplexers 221 and 222 . The multiplexers 221 and 222 can be respectively coupled to the corresponding two source lines, and are used to respectively and alternately drive the corresponding two source lines.

在本發明實施例中，顯示面板220的像素單元中的每一者可如同圖2中所示的像素單元230一樣。像素單元230包括電晶體231、232、發光單元233及電容器234。電晶體231的第一端耦接至高電位電源電壓ELVDD，且電晶體231的第二端耦接至電晶體232的第一端。電晶體232的第二端耦接至發光單元233的第一端，且發光單元233的第二端耦接至低電位電源電壓ELVSS。電容器234耦合在高電位電源電壓ELVDD與電晶體231的控制端之間。在本發明實施例中，電晶體232的控制端用以接收發射信號ES且根據所述發射信號ES驅動發光單元233。 In an embodiment of the present invention, each of the pixel units of the display panel 220 may be the same as the pixel unit 230 shown in FIG. 2 . The pixel unit 230 includes transistors 231 and 232 , a light-emitting unit 233 and a capacitor 234 . The first end of the transistor 231 is coupled to the high potential power supply voltage ELVDD, and the second end of the transistor 231 is coupled to the first end of the transistor 232 . The second end of the transistor 232 is coupled to the first end of the light emitting unit 233, and the second end of the light emitting unit 233 is coupled to the low-potential power supply voltage ELVSS. The capacitor 234 is coupled between the high potential power supply voltage ELVDD and the control terminal of the transistor 231 . In the embodiment of the present invention, the control terminal of the transistor 232 is used to receive the emission signal ES and drive the light-emitting unit 233 according to the emission signal ES.

圖3A為根據本發明一實施例的適用於互容式觸控面板的類比前端電路的示意圖。參考圖3，類比前端電路300可設置在 觸控控制器中以用於從圖2所示觸控面板210的感測電容(例如是互容電容)接收觸控驅動信號TS，且觸控控制器可還包括其他功能電路，例如用於驅動圖2所示顯示面板220的顯示驅動器。在本發明實施例中，類比前端電路300包括類比前端310、第一開關320及第二開關330。類比前端310包括輸入端及輸出端。第一開關320包括第一端及第二端。第一開關320的第一端耦接至類比前端310的輸入端，且第一開關的第二端耦接至面板佈線L1，其中面板佈線L1具有等效電阻340。第二開關330包括第一端及第二端。第二開關330的第一端耦接至第一開關320的第二端，且第二開關330的第二端耦接至參考電壓Vf。在本發明另一實施例中，參考電壓Vf可以為共模電壓。另外，本發明的類比前端310為信號處理電路。類比前端310可還包括其他電路單元或其他功能電路，例如圖1所示類比前端電路100，但本發明並不僅限於此。 3A is a schematic diagram of an analog front-end circuit suitable for a mutual capacitive touch panel according to an embodiment of the present invention. Referring to FIG. 3, the analog front-end circuit 300 may be arranged in The touch controller is used for receiving the touch drive signal TS from the sensing capacitor (eg, mutual capacitance) of the touch panel 210 shown in FIG. 2 , and the touch controller may further include other functional circuits, such as for A display driver for driving the display panel 220 shown in FIG. 2 . In the embodiment of the present invention, the analog front-end circuit 300 includes an analog front-end 310 , a first switch 320 and a second switch 330 . The analog front end 310 includes an input terminal and an output terminal. The first switch 320 includes a first terminal and a second terminal. The first end of the first switch 320 is coupled to the input end of the analog front end 310 , and the second end of the first switch is coupled to the panel wiring L1 , where the panel wiring L1 has an equivalent resistance 340 . The second switch 330 includes a first terminal and a second terminal. The first end of the second switch 330 is coupled to the second end of the first switch 320, and the second end of the second switch 330 is coupled to the reference voltage Vf. In another embodiment of the present invention, the reference voltage Vf may be a common mode voltage. In addition, the analog front end 310 of the present invention is a signal processing circuit. The analog front end 310 may further include other circuit units or other functional circuits, such as the analog front end circuit 100 shown in FIG. 1 , but the present invention is not limited thereto.

值得注意的是，本發明各實施例所述的觸控控制器可例如是整合在具有顯示驅動的複合式晶片當中，例如觸控和顯示驅動器整合(Touch and Display Driver Integration，TDDI)晶片。或者，本發明各實施例所述的觸控控制器可例如是整合在具有指紋感測驅動以及顯示驅動的複合式晶片當中，例如指紋、觸控和顯示驅動器整合(Fingerprint,Touch and Display driver Integration，FTDI)晶片。 It should be noted that, the touch controller according to the embodiments of the present invention may be integrated in a composite chip having a display driver, such as a touch and display driver integration (TDDI) chip. Alternatively, the touch controller according to the embodiments of the present invention may be integrated into a composite chip with fingerprint sensing driver and display driver, such as fingerprint, touch and display driver integration (Fingerprint, Touch and Display driver Integration) , FTDI) wafers.

參考圖2及圖3A，在本發明實施例中，類比前端電路300可經由面板佈線L1耦接至觸控面板210，且面板佈線L1與觸控 面板210之間存在等效電容350。等效電容350的一端可耦接至等效電阻340以及面板佈線L1，並且等效電容350的另一端可通過節點A1耦接至觸控面板210。然而，由於觸控面板210與顯示面板220集成在一起，因此類比前端電路300也可經由面板佈線L1耦接至顯示面板220，其中面板佈線L1與顯示面板220之間存在等效電容360。等效電容360的一端可耦接至等效電阻340以及面板佈線L1，並且等效電容360的另一端可通過節點A2耦接至顯示面板220。在本發明實施例中，類比前端310用以在第一開關320導通且第二開關330關斷時，接收從觸控面板210的觸控感測器經由面板佈線L1及第一開關320而傳送到類比前端310的輸入端的觸控驅動信號TS，以使得類比前端310的輸出端根據觸控驅動信號TS輸出輸出信號Vout1。此外，類比前端電路300還用以在第二開關330導通且第一開關320關斷時，將耦合雜訊信號NS從顯示面板220經由面板佈線L1及第二開關330傳送到參考電壓Vf。換句話說，類比前端電路300可通過控制第一開關320及第二開關330的導通狀態防止類比前端310接收來自於顯示面板220的耦合雜訊信號NS。此外，在一實施例中，耦合雜訊信號NS亦可包括由指紋感測面板所提供的干擾信號。 Referring to FIG. 2 and FIG. 3A , in the embodiment of the present invention, the analog front-end circuit 300 can be coupled to the touch panel 210 via the panel wiring L1 , and the panel wiring L1 is connected to the touch panel An equivalent capacitance 350 exists between the panels 210 . One end of the equivalent capacitor 350 can be coupled to the equivalent resistor 340 and the panel wiring L1, and the other end of the equivalent capacitor 350 can be coupled to the touch panel 210 through the node A1. However, since the touch panel 210 and the display panel 220 are integrated together, the analog front-end circuit 300 can also be coupled to the display panel 220 via the panel wiring L1 , where an equivalent capacitance 360 exists between the panel wiring L1 and the display panel 220 . One end of the equivalent capacitor 360 may be coupled to the equivalent resistor 340 and the panel wiring L1, and the other end of the equivalent capacitor 360 may be coupled to the display panel 220 through the node A2. In the embodiment of the present invention, the analog front end 310 is used for receiving the transmission from the touch sensor of the touch panel 210 via the panel wiring L1 and the first switch 320 when the first switch 320 is turned on and the second switch 330 is turned off The touch driving signal TS to the input terminal of the analog front end 310, so that the output terminal of the analog front end 310 outputs the output signal Vout1 according to the touch driving signal TS. In addition, the analog front-end circuit 300 is also used to transmit the coupled noise signal NS from the display panel 220 to the reference voltage Vf through the panel wiring L1 and the second switch 330 when the second switch 330 is turned on and the first switch 320 is turned off. In other words, the analog front end circuit 300 can prevent the analog front end 310 from receiving the coupled noise signal NS from the display panel 220 by controlling the conduction states of the first switch 320 and the second switch 330 . In addition, in one embodiment, the coupled noise signal NS may also include an interference signal provided by the fingerprint sensing panel.

圖3B為根據本發明一實施例的適用於自容式觸控面板的類比前端電路的示意圖。參考圖3B，類比前端電路500可設置在觸控控制器中以發送觸控驅動信號TS至圖2所示觸控面板210，以感測觸控面板210的電容(例如是自容電容)，且觸控控 制器可還包括其他功能電路，例如用於驅動圖2所示顯示面板220的顯示驅動器。在本發明實施例中，類比前端電路500包括類比前端510、第一開關520及第二開關530。類比前端510包括第一輸入端、第二輸入端及輸出端，其中類比前端510的第一輸入端耦接至類比前端510的輸出端。第一開關520包括第一端及第二端。第一開關520的第一端耦接至類比前端510的第一輸入端，且第一開關520的第二端耦接至面板佈線L3，其中面板佈線L3具有等效電阻540。第二開關530包括第一端及第二端。第二開關530的第一端耦接至第一開關520的第二端，且第二開關530的第二端耦接至參考電壓Vf1。在本發明另一實施例中，參考電壓Vf1可以為觸控驅動信號TS或共模電壓，但本揭露並不限於此。另外，本發明的類比前端510為信號處理電路。類比前端510可還包括其他電路單元或其他功能電路，例如圖1所示類比前端電路100，但本發明並不僅限於此。 3B is a schematic diagram of an analog front-end circuit suitable for a self-capacitive touch panel according to an embodiment of the present invention. Referring to FIG. 3B , the analog front-end circuit 500 can be set in the touch controller to send the touch driving signal TS to the touch panel 210 shown in FIG. 2 to sense the capacitance (eg, self-capacitance) of the touch panel 210 . and touch control The controller may further include other functional circuits, such as a display driver for driving the display panel 220 shown in FIG. 2 . In the embodiment of the present invention, the analog front-end circuit 500 includes an analog front-end 510 , a first switch 520 and a second switch 530 . The analog front end 510 includes a first input terminal, a second input terminal and an output terminal, wherein the first input terminal of the analog front end 510 is coupled to the output terminal of the analog front end 510 . The first switch 520 includes a first terminal and a second terminal. The first end of the first switch 520 is coupled to the first input end of the analog front end 510 , and the second end of the first switch 520 is coupled to the panel wiring L3 , where the panel wiring L3 has an equivalent resistance 540 . The second switch 530 includes a first terminal and a second terminal. The first end of the second switch 530 is coupled to the second end of the first switch 520, and the second end of the second switch 530 is coupled to the reference voltage Vf1. In another embodiment of the present invention, the reference voltage Vf1 may be the touch driving signal TS or the common mode voltage, but the present disclosure is not limited thereto. In addition, the analog front end 510 of the present invention is a signal processing circuit. The analog front end 510 may further include other circuit units or other functional circuits, such as the analog front end circuit 100 shown in FIG. 1 , but the present invention is not limited thereto.

參考圖2及圖3B，在本發明實施例中，類比前端電路500可通過面板佈線L3以及節點A3耦接至觸控面板210。由於觸控面板210與顯示面板220集成在一起，因此類比前端電路500也可通過面板佈線L3耦接至顯示面板220，其中面板佈線L3與顯示面板220之間存在等效電容560。等效電容560的一端可耦接至等效電阻540以及面板佈線L3，並且等效電容560的另一端可通過節點A4耦接至顯示面板220。在本發明實施例中，類比前端510用以在第一開關520導通且第二開關530關斷時，從類比前端510 的第二輸入端接收觸控驅動信號TS，並且接著通過類比前端510的第一輸入端、第一開關520、面板佈線L3以及節點A3將觸控驅動信號TS傳送到觸控面板210的觸控感測器。類比前端510的輸出端根據觸控驅動信號TS因自容感應而反應的電壓變化來輸出輸出信號Vout1。此外，類比前端電路500還用以在第二開關530導通且第一開關520關斷時，將耦合雜訊信號NS從顯示面板220通過面板佈線L3及第二開關530傳送到參考電壓Vf1。換句話說，類比前端電路500可通過控制第一開關520及第二開關530的導通狀態防止類比前端510接收耦合雜訊信號NS。 Referring to FIG. 2 and FIG. 3B , in an embodiment of the present invention, the analog front-end circuit 500 may be coupled to the touch panel 210 through the panel wiring L3 and the node A3 . Since the touch panel 210 and the display panel 220 are integrated together, the analog front-end circuit 500 can also be coupled to the display panel 220 through the panel wiring L3 , where an equivalent capacitance 560 exists between the panel wiring L3 and the display panel 220 . One end of the equivalent capacitor 560 may be coupled to the equivalent resistor 540 and the panel wiring L3, and the other end of the equivalent capacitor 560 may be coupled to the display panel 220 through the node A4. In the embodiment of the present invention, the analog front end 510 is used to convert the analog front end 510 from the analog front end 510 when the first switch 520 is turned on and the second switch 530 is turned off. The second input end of the touch control signal TS receives the touch drive signal TS, and then transmits the touch drive signal TS to the touch control device of the touch panel 210 through the first input end of the analog front end 510 , the first switch 520 , the panel wiring L3 and the node A3 sensor. The output terminal of the analog front end 510 outputs the output signal Vout1 according to the voltage change of the touch driving signal TS due to the self-capacitance induction. In addition, the analog front-end circuit 500 is also used to transmit the coupled noise signal NS from the display panel 220 to the reference voltage Vf1 through the panel wiring L3 and the second switch 530 when the second switch 530 is turned on and the first switch 520 is turned off. In other words, the analog front end circuit 500 can prevent the analog front end 510 from receiving the coupled noise signal NS by controlling the conduction states of the first switch 520 and the second switch 530 .

圖4為根據本發明一實施例的類比前端電路的操作的信號波形圖。參考圖2、圖3A以及圖4，圖4的信號波形可適用於圖3A的類比前端電路300。在本發明實施例中，顯示面板220可由水平同步信號HS驅動，因此顯示面板220可同步地產生傳送到類比前端電路300的耦合雜訊信號NS。如圖4中所示，耦合雜訊信號NS的每一上升緣及每一下降緣可與水平同步信號HS的每一上升緣同步。在本發明實施例中，水平同步信號HS的信號與觸控驅動信號TS的每一相鄰的上升緣與下降緣間隔一預定相位差而同步，即觸控驅動信號TS被移位一預定相位差，以在類比前端310接收觸控驅動信號TS的週期期間防止類比前端310接收耦合雜訊信號NS。 4 is a signal waveform diagram illustrating the operation of an analog front-end circuit according to an embodiment of the present invention. Referring to FIG. 2 , FIG. 3A and FIG. 4 , the signal waveforms of FIG. 4 can be applied to the analog front-end circuit 300 of FIG. 3A . In the embodiment of the present invention, the display panel 220 can be driven by the horizontal synchronization signal HS, so the display panel 220 can synchronously generate the coupled noise signal NS transmitted to the analog front-end circuit 300 . As shown in FIG. 4, each rising edge and each falling edge of the coupled noise signal NS may be synchronized with each rising edge of the horizontal synchronization signal HS. In the embodiment of the present invention, the signal of the horizontal synchronization signal HS is synchronized with each adjacent rising edge and falling edge of the touch driving signal TS at a predetermined phase difference, that is, the touch driving signal TS is shifted by a predetermined phase difference, so as to prevent the analog front end 310 from receiving the coupled noise signal NS during the period in which the analog front end 310 receives the touch driving signal TS.

在本發明實施例中，第一開關320用以接收第一開關信號S1，且第二開關330用以接收第二開關信號S2。第一開關信號 S1及第二開關信號S2為週期性方波，且第一開關信號S1與第二開關信號S2為反相。因此，第二開關330在第一週期P1、P1’期間導通，且第一開關320在第二週期P2、P2’期間導通。第一週期P1與第二週期P2未重疊，且第一週期P1’與第二週期P2’未重疊。應注意，如圖4中所示，第一開關信號S1的每一下降緣與水平同步信號HS的每一上升緣以及耦合雜訊信號NS的每一下降緣及每一上升緣同步，且第一開關信號S1的每一上升緣與觸控驅動信號TS的每一上升緣及每一下降緣同步。因此，第二開關信號S2的每一上升緣與水平同步信號HS的每一上升緣以及耦合雜訊信號NS的每一下降緣及每一上升緣同步，且第二開關信號S2的每一下降緣與觸控驅動信號TS的每一上升緣及每一下降緣同步。換句話說，當經由面板佈線L1傳送耦合雜訊信號NS時，關斷第一開關320以防止類比前端310接收耦合雜訊信號NS。 In the embodiment of the present invention, the first switch 320 is used to receive the first switch signal S1, and the second switch 330 is used to receive the second switch signal S2. first switch signal S1 and the second switch signal S2 are periodic square waves, and the first switch signal S1 and the second switch signal S2 are in opposite phases. Therefore, the second switch 330 is turned on during the first period P1, P1', and the first switch 320 is turned on during the second period P2, P2'. The first period P1 and the second period P2 do not overlap, and the first period P1' and the second period P2' do not overlap. It should be noted that, as shown in FIG. 4 , each falling edge of the first switching signal S1 is synchronized with each rising edge of the horizontal synchronization signal HS and each falling edge and each rising edge of the coupled noise signal NS, and the first Each rising edge of a switch signal S1 is synchronized with each rising edge and each falling edge of the touch driving signal TS. Therefore, each rising edge of the second switching signal S2 is synchronized with each rising edge of the horizontal synchronization signal HS and each falling edge and each rising edge of the coupled noise signal NS, and each falling edge of the second switching signal S2 The edge is synchronized with each rising edge and each falling edge of the touch driving signal TS. In other words, when the coupled noise signal NS is transmitted through the panel wiring L1, the first switch 320 is turned off to prevent the analog front end 310 from receiving the coupled noise signal NS.

因此，如圖4中所示，類比前端電路300可在第一週期P1、P1’期間將耦合雜訊信號NS經由面板佈線L1及第二開關330釋放到參考電壓Vf，且類比前端310用以在第二週期P2期間經由面板佈線L1及第一開關320接收觸控驅動信號TS。如圖4中所示，類比前端310用以在第二週期P2期間在不接收耦合雜訊信號NS或在接收相對低的耦合雜訊信號NS的情況下接收觸控驅動信號TS，以使得在第二週期P2期間類比前端310的輸出端輸出具有電壓Va的輸出信號Vout1。電壓Va例如小於電源電壓+VDD。在本發明實施例中，類比前端310可在下一第一週期P1’期間連續 地輸出具有電壓Va的輸出信號Vout1，且可在下一第二週期P2’期間將類比前端310復位(或放電)。應注意，輸出信號Vout1可代表觸控面板210的觸控感測器的觸控資訊，其中輸出信號Vout1可在週期P1到週期P2’期間在電壓0到電壓Va之間擺動。換句話說，類比前端電路300可根據圖4的信號波形圖操作，以使得在第二週期P2期間類比前端電路300可輸出具有較高信噪比的輸出信號Vout1。 Therefore, as shown in FIG. 4 , the analog front end circuit 300 can release the coupled noise signal NS to the reference voltage Vf through the panel wiring L1 and the second switch 330 during the first periods P1 and P1 ′, and the analog front end 310 is used for The touch driving signal TS is received through the panel wiring L1 and the first switch 320 during the second period P2. As shown in FIG. 4 , the analog front end 310 is used to receive the touch driving signal TS without receiving the coupled noise signal NS or with the relatively low coupled noise signal NS during the second period P2, so that the During the second period P2, the output terminal of the analog front end 310 outputs the output signal Vout1 with the voltage Va. The voltage Va is, for example, lower than the power supply voltage +VDD. In an embodiment of the present invention, the analog front end 310 may be continuous during the next first period P1' The output signal Vout1 having the voltage Va is output to ground, and the analog front end 310 may be reset (or discharged) during the next second period P2'. It should be noted that the output signal Vout1 may represent touch information of the touch sensor of the touch panel 210, wherein the output signal Vout1 may swing between the voltage 0 and the voltage Va during the period P1 to the period P2'. In other words, the analog front end circuit 300 may operate according to the signal waveform diagram of FIG. 4 , so that the analog front end circuit 300 may output the output signal Vout1 with a higher signal-to-noise ratio during the second period P2.

參考圖2、圖3B以及圖4，圖4的信號波形亦可適用於圖3B的類比前端電路500。在本發明實施例中，顯示面板220可由水平同步信號HS驅動，因此顯示面板220可同步地產生傳送到類比前端電路500的耦合雜訊信號NS。在本發明實施例中，當通過面板佈線L3傳送耦合雜訊信號NS時，關斷第一開關520以防止類比前端510的第一端接收耦合雜訊信號NS。如圖4中所示，類比前端電路500可在第一週期P1、P1’期間將耦合雜訊信號NS通過面板佈線L3及第二開關530釋放到參考電壓Vf1，且類比前端510的第二輸出端用以在第二週期P2期間接收觸控驅動信號TS，以使類比前端510的第一輸出端用以在第二週期P2期間通過第一開關520、面板佈線L3及節點A3發送觸控驅動信號TS至觸控面板210。 Referring to FIG. 2 , FIG. 3B and FIG. 4 , the signal waveforms of FIG. 4 are also applicable to the analog front-end circuit 500 of FIG. 3B . In the embodiment of the present invention, the display panel 220 can be driven by the horizontal synchronization signal HS, so the display panel 220 can synchronously generate the coupled noise signal NS transmitted to the analog front-end circuit 500 . In the embodiment of the present invention, when the coupled noise signal NS is transmitted through the panel wiring L3, the first switch 520 is turned off to prevent the first end of the analog front end 510 from receiving the coupled noise signal NS. As shown in FIG. 4 , the analog front-end circuit 500 may release the coupled noise signal NS to the reference voltage Vf1 through the panel wiring L3 and the second switch 530 during the first periods P1 and P1 ′, and the second output of the analog front-end 510 The terminal is used for receiving the touch driving signal TS during the second period P2, so that the first output terminal of the analog front end 510 is used for sending the touch driving signal through the first switch 520, the panel wiring L3 and the node A3 during the second period P2 The signal TS is sent to the touch panel 210 .

在本發明實施例中，類比前端510的第一端用以在第二週期P2期間在不接收耦合雜訊信號NS或在接收相對低的耦合雜訊信號NS的情況下發送觸控驅動信號TS至觸控面板210進行感 應，以使得在第二週期P2期間類比前端510的輸出端輸出具有電壓Va的輸出信號Vout1。電壓Va例如小於電源電壓+VDD。在本發明實施例中，類比前端510可在下一第一週期P1’期間連續地輸出具有電壓Va的輸出信號Vout1，且可在下一第二週期P2’期間將類比前端510復位(或放電)。應注意，輸出信號Vout1可代表觸控面板210的觸控感測器的觸控資訊，其中輸出信號Vout1可在週期P1到週期P2’期間在電壓0到電壓Va之間擺動。換句話說，類比前端電路500可根據圖4的信號波形圖操作，以使得在第二週期P2期間類比前端電路500可輸出具有較高信噪比的輸出信號Vout1。 In the embodiment of the present invention, the first end of the analog front end 510 is used for sending the touch driving signal TS without receiving the coupling noise signal NS or receiving the relatively low coupling noise signal NS during the second period P2 to touch panel 210 response, so that the output terminal of the analog front end 510 outputs the output signal Vout1 having the voltage Va during the second period P2. The voltage Va is, for example, lower than the power supply voltage +VDD. In the embodiment of the present invention, the analog front end 510 can continuously output the output signal Vout1 with the voltage Va during the next first period P1', and can reset (or discharge) the analog front end 510 during the next second period P2'. It should be noted that the output signal Vout1 may represent touch information of the touch sensor of the touch panel 210, wherein the output signal Vout1 may swing between the voltage 0 and the voltage Va during the period P1 to the period P2'. In other words, the analog front end circuit 500 may operate according to the signal waveform diagram of FIG. 4 , so that the analog front end circuit 500 may output the output signal Vout1 having a higher signal-to-noise ratio during the second period P2.

然而，關於本實施例(圖3B與圖4)的各信號波形特徵可參照上述實施例(圖3A與圖4)可獲致足夠的教示、建議以及實施說明，因此不多加贅述。另外，圖3A及圖3B在適用圖4的信號波形的情況下可分別具有不同的電壓振福，圖4的信號波形僅用於表示各關開切換結果與各信號波形變化之間的關係，而非限制圖3A及圖3B的類比前端電路300、500採用相同電壓振幅結果來進行運作。 However, regarding the signal waveform characteristics of the present embodiment (FIG. 3B and FIG. 4), reference can be made to the above-mentioned embodiment (FIG. 3A and FIG. 4) to obtain sufficient teachings, suggestions, and implementation descriptions, and thus will not be repeated. In addition, FIGS. 3A and 3B may have different voltage vibrations respectively when the signal waveform of FIG. 4 is applied, and the signal waveform of FIG. Without limitation, the analog front-end circuits 300 and 500 of FIGS. 3A and 3B operate with the same voltage amplitude results.

圖5A為根據本發明另一實施例的適用於互容式觸控面板的類比前端電路的示意圖。參考圖5A，類比前端電路400可設置在觸控控制器中以用於從圖2所示觸控面板210的感測電容(例如是互容電容)接收觸控驅動信號TS，且觸控控制器可還包括其他功能電路，例如用於驅動圖2所示顯示面板220的顯示驅動器。 在本發明實施例中，類比前端電路400包括類比前端410、第一開關420、第二開關430及第三開關470。在本發明實施例中，類比前端410包括輸入端及輸出端。第一開關420包括第一端及第二端。第一開關420的第一端耦接至類比前端410的輸入端，且第一開關的第二端耦接至面板佈線L2，其中面板佈線L2具有等效電阻440。第二開關430包括第一端及第二端。第二開關430的第一端耦接至第一開關420的第二端，且第二開關430的第二端耦接至參考電壓Vf。第三開關470包括第一端及第二端。第三開關470的第一端耦接至類比前端410的輸入端，且第三開關470的第二端耦接至類比前端410的輸出端。在本發明實施例中，第三開關470與第二開關430同步地開關。另外，本發明的類比前端410是信號處理電路。類比前端410可還包括其他電路單元或其他功能電路，例如圖1所示類比前端電路100，但本發明並不僅限於此。 5A is a schematic diagram of an analog front-end circuit suitable for a mutual capacitive touch panel according to another embodiment of the present invention. Referring to FIG. 5A , the analog front-end circuit 400 can be provided in the touch controller for receiving the touch driving signal TS from the sensing capacitor (eg, mutual capacitance) of the touch panel 210 shown in FIG. 2 , and controlling the touch The device may further include other functional circuits, such as a display driver for driving the display panel 220 shown in FIG. 2 . In the embodiment of the present invention, the analog front-end circuit 400 includes an analog front-end 410 , a first switch 420 , a second switch 430 and a third switch 470 . In the embodiment of the present invention, the analog front end 410 includes an input end and an output end. The first switch 420 includes a first terminal and a second terminal. The first end of the first switch 420 is coupled to the input end of the analog front end 410 , and the second end of the first switch is coupled to the panel wiring L2 , where the panel wiring L2 has an equivalent resistance 440 . The second switch 430 includes a first terminal and a second terminal. The first end of the second switch 430 is coupled to the second end of the first switch 420, and the second end of the second switch 430 is coupled to the reference voltage Vf. The third switch 470 includes a first terminal and a second terminal. The first terminal of the third switch 470 is coupled to the input terminal of the analog front end 410 , and the second terminal of the third switch 470 is coupled to the output terminal of the analog front end 410 . In the embodiment of the present invention, the third switch 470 is switched synchronously with the second switch 430 . Additionally, the analog front end 410 of the present invention is a signal processing circuit. The analog front end 410 may further include other circuit units or other functional circuits, such as the analog front end circuit 100 shown in FIG. 1 , but the present invention is not limited thereto.

參考圖2及圖5A，在本發明實施例中，類比前端電路400可經由面板佈線L2耦接至觸控面板210，且面板佈線L2與觸控面板210之間存在等效電容450。等效電容450的一端可耦接至等效電阻440以及面板佈線L2，並且等效電容450的另一端可通過節點A5耦接至觸控面板210。然而，由於觸控面板210與顯示面板220集成在一起，因此類比前端電路400也可經由面板佈線L2耦接至顯示面板220，其中面板佈線L2與顯示面板220之間存在等效電容460。等效電容460的一端可耦接至等效電阻440以及面板佈線L2，並且等效電容460的另一端可通過節點A6耦接至顯 示面板220。在本發明實施例中，類比前端410用以在第一開關420導通且第二開關430關斷時，接收從觸控面板210的觸控感測器經由面板佈線L2及第一開關420傳送到類比前端410的輸入端的觸控驅動信號TS，以使得類比前端410的輸出端根據所述觸控驅動信號TS輸出輸出信號。此外，類比前端電路400還用以在第二開關430導通且第一開關420關斷時將耦合雜訊信號NS從顯示面板220經由面板佈線L2及第二開關430傳送到參考電壓Vf。換句話說，類比前端電路400可通過控制第一開關420及第二開關430的導通狀態防止類比前端410接收耦合雜訊信號NS。此外，第三開關470與第二開關430同步地開關，且當第三開關470導通時類比前端410被復位(或放電)。 Referring to FIG. 2 and FIG. 5A , in the embodiment of the present invention, the analog front-end circuit 400 may be coupled to the touch panel 210 via the panel wiring L2 , and an equivalent capacitance 450 exists between the panel wiring L2 and the touch panel 210 . One end of the equivalent capacitor 450 can be coupled to the equivalent resistor 440 and the panel wiring L2, and the other end of the equivalent capacitor 450 can be coupled to the touch panel 210 through the node A5. However, since the touch panel 210 is integrated with the display panel 220 , the analog front-end circuit 400 can also be coupled to the display panel 220 via the panel wiring L2 , where an equivalent capacitance 460 exists between the panel wiring L2 and the display panel 220 . One end of the equivalent capacitor 460 can be coupled to the equivalent resistor 440 and the panel wiring L2, and the other end of the equivalent capacitor 460 can be coupled to the display through the node A6. display panel 220. In the embodiment of the present invention, the analog front end 410 is used for receiving the transmission from the touch sensor of the touch panel 210 via the panel wiring L2 and the first switch 420 to the touch sensor when the first switch 420 is turned on and the second switch 430 is turned off. The touch driving signal TS of the input terminal of the analog front end 410 is compared, so that the output terminal of the analog front end 410 outputs an output signal according to the touch driving signal TS. In addition, the analog front-end circuit 400 is also used to transmit the coupled noise signal NS from the display panel 220 to the reference voltage Vf through the panel wiring L2 and the second switch 430 when the second switch 430 is turned on and the first switch 420 is turned off. In other words, the analog front end circuit 400 can prevent the analog front end 410 from receiving the coupled noise signal NS by controlling the conduction states of the first switch 420 and the second switch 430 . In addition, the third switch 470 is switched in synchronization with the second switch 430, and the analog front end 410 is reset (or discharged) when the third switch 470 is turned on.

圖5B為根據本發明另一實施例的適用於自容式觸控面板的類比前端電路的示意圖。參考圖5B，類比前端電路600可設置在觸控控制器中以發送觸控驅動信號TS至如圖2所示觸控面板210，以感測觸控面板210的電容(例如是自容電容)，且觸控控制器可還包括其他功能電路，例如用於驅動圖2所示顯示面板220的顯示驅動器。在本發明實施例中，類比前端電路600包括類比前端610、第一開關620、第二開關630及第三開關670。在本發明實施例中，類比前端610包括第一輸入端、第二輸入端及輸出端，其中類比前端610的第一輸入端耦接至類比前端610的輸出端。第一開關620包括第一端及第二端。第一開關620的第一端耦接至類比前端610的第一輸入端，且第一開關的第二端耦接至 面板佈線L4，其中面板佈線L4具有等效電阻640。第二開關630包括第一端及第二端。第二開關630的第一端耦接至第一開關620的第二端，且第二開關630的第二端耦接至參考電壓Vf1。第三開關670包括第一端及第二端。第三開關670的第一端耦接至參考電壓Vf2，且第三開關670的第二端耦接至類比前端610的輸出端。在本發明實施例中，第三開關670與第二開關630同步地開關。在本發明另一實施例中，參考電壓Vf1、Vf2可以為觸控驅動信號TS或共模電壓，但本揭露並不限於此。另外，本發明的類比前端610是信號處理電路。類比前端610可還包括其他電路單元或其他功能電路，例如圖1所示類比前端電路100，但本發明並不僅限於此。 5B is a schematic diagram of an analog front-end circuit suitable for a self-capacitive touch panel according to another embodiment of the present invention. Referring to FIG. 5B , the analog front-end circuit 600 can be arranged in the touch controller to send the touch driving signal TS to the touch panel 210 as shown in FIG. 2 to sense the capacitance (eg, self-capacitance) of the touch panel 210 . , and the touch controller may further include other functional circuits, such as a display driver for driving the display panel 220 shown in FIG. 2 . In the embodiment of the present invention, the analog front-end circuit 600 includes an analog front-end 610 , a first switch 620 , a second switch 630 and a third switch 670 . In the embodiment of the present invention, the analog front end 610 includes a first input terminal, a second input terminal and an output terminal, wherein the first input terminal of the analog front end 610 is coupled to the output terminal of the analog front end 610 . The first switch 620 includes a first terminal and a second terminal. The first end of the first switch 620 is coupled to the first input end of the analog front end 610, and the second end of the first switch is coupled to Panel wiring L4, wherein the panel wiring L4 has an equivalent resistance 640. The second switch 630 includes a first terminal and a second terminal. The first end of the second switch 630 is coupled to the second end of the first switch 620, and the second end of the second switch 630 is coupled to the reference voltage Vf1. The third switch 670 includes a first terminal and a second terminal. The first terminal of the third switch 670 is coupled to the reference voltage Vf2 , and the second terminal of the third switch 670 is coupled to the output terminal of the analog front end 610 . In the embodiment of the present invention, the third switch 670 is switched synchronously with the second switch 630 . In another embodiment of the present invention, the reference voltages Vf1 and Vf2 may be the touch driving signal TS or the common mode voltage, but the present disclosure is not limited thereto. Additionally, the analog front end 610 of the present invention is a signal processing circuit. The analog front end 610 may further include other circuit units or other functional circuits, such as the analog front end circuit 100 shown in FIG. 1 , but the present invention is not limited thereto.

參考圖2及圖5B，在本發明實施例中，類比前端電路600可通過面板佈線L4以及節點A7耦接至觸控面板610。然而，由於觸控面板210與顯示面板220集成在一起，因此類比前端電路600也可通過面板佈線L4耦接至顯示面板220，其中面板佈線L4與顯示面板220之間存在等效電容660。等效電容660的一端可耦接至等效電阻640以及面板佈線L4，並且等效電容660的另一端可通過節點A8耦接至顯示面板220。在本發明實施例中，類比前端610用以在第一開關620導通且第二開關630關斷時，從類比前端610的第二輸入端接收觸控驅動信號TS，並且接著通過類比前端610的第一輸入端、第一開關620、面板佈線L4以及節點A7將觸控驅動信號TS傳送到觸控面板210的觸控感測器。類比前端 610的輸出端根據觸控驅動信號TS因自容感應而反應的電壓變化來輸出輸出信號Vout2。此外，類比前端電路600還用以在第二開關630導通且第一開關620關斷時將耦合雜訊信號NS從顯示面板220通過面板佈線L4及第二開關630傳送到參考電壓Vf1。換句話說，類比前端電路600可通過控制第一開關620及第二開關630的導通狀態防止類比前端610接收耦合雜訊信號NS。此外，第三開關670與第二開關630同步地開關，且當第三開關670導通時類比前端610的輸出端可被復位(或放電)。 Referring to FIG. 2 and FIG. 5B , in an embodiment of the present invention, the analog front-end circuit 600 may be coupled to the touch panel 610 through the panel wiring L4 and the node A7 . However, since the touch panel 210 and the display panel 220 are integrated together, the analog front-end circuit 600 can also be coupled to the display panel 220 through the panel wiring L4 , where an equivalent capacitance 660 exists between the panel wiring L4 and the display panel 220 . One end of the equivalent capacitor 660 may be coupled to the equivalent resistor 640 and the panel wiring L4, and the other end of the equivalent capacitor 660 may be coupled to the display panel 220 through the node A8. In the embodiment of the present invention, the analog front end 610 is configured to receive the touch driving signal TS from the second input end of the analog front end 610 when the first switch 620 is turned on and the second switch 630 is turned off, and then pass the touch driving signal TS through the analog front end 610 . The first input terminal, the first switch 620 , the panel wiring L4 and the node A7 transmit the touch driving signal TS to the touch sensor of the touch panel 210 . analog front end The output end of 610 outputs the output signal Vout2 according to the voltage change of the touch driving signal TS due to the self-capacitance induction. In addition, the analog front-end circuit 600 is also used to transmit the coupled noise signal NS from the display panel 220 to the reference voltage Vf1 through the panel wiring L4 and the second switch 630 when the second switch 630 is turned on and the first switch 620 is turned off. In other words, the analog front end circuit 600 can prevent the analog front end 610 from receiving the coupled noise signal NS by controlling the conduction states of the first switch 620 and the second switch 630 . In addition, the third switch 670 is switched in synchronization with the second switch 630, and the output terminal of the analog front end 610 can be reset (or discharged) when the third switch 670 is turned on.

圖6為根據本發明另一實施例的類比前端電路的操作的信號波形圖。參考圖2、圖5A及圖6，在本發明實施例中，顯示面板220可由水平同步信號HS驅動，因此顯示面板220可同步地產生傳送到類比前端電路400的耦合雜訊信號NS。如圖6中所示，耦合雜訊信號NS的每一上升緣及每一下降緣可與水平同步信號HS的每一上升緣同步。在本發明實施例中，水平同步信號HS的信號與觸控驅動信號TS的每一相鄰的上升緣與下降緣間隔一預定相位差而同步，即觸控驅動信號TS被移位一預定相位差，以在類比前端410接收觸控驅動信號TS的週期期間防止類比前端410同時接收耦合雜訊信號NS。 6 is a signal waveform diagram illustrating the operation of an analog front-end circuit according to another embodiment of the present invention. 2 , 5A and 6 , in the embodiment of the present invention, the display panel 220 can be driven by the horizontal synchronization signal HS, so the display panel 220 can synchronously generate the coupled noise signal NS transmitted to the analog front-end circuit 400 . As shown in FIG. 6, each rising edge and each falling edge of the coupled noise signal NS may be synchronized with each rising edge of the horizontal synchronization signal HS. In the embodiment of the present invention, the signal of the horizontal synchronization signal HS is synchronized with each adjacent rising edge and falling edge of the touch driving signal TS at a predetermined phase difference, that is, the touch driving signal TS is shifted by a predetermined phase difference, so as to prevent the analog front end 410 from simultaneously receiving the coupled noise signal NS during the period in which the analog front end 410 receives the touch driving signal TS.

在本發明實施例中，第一開關420用以接收第一開關信號S1，第二開關430用以接收第二開關信號S2，且第三開關470用以接收第三開關信號S3。第一開關信號S1、第二開關信號S2及第三開關信號S3為週期性方波，且第一開關信號S1與第二開 關信號S2為反相。第二開關信號S2與第三開關信號S3具有相同的波形。因此，第二開關430與第三開關470在第一週期P1、P1’期間導通，且第一開關420在第二週期P2、P2’期間導通。第一週期P1與第二週期P2未重疊，且第一週期P1’與第二週期P2’未重疊。應注意，如圖6中所示，第一開關信號S1的每一下降緣與水平同步信號HS的每一上升緣以及耦合雜訊信號NS的每一下降緣及每一上升緣同步，且第一開關信號S1的每一上升緣與觸控驅動信號TS的每一上升緣及每一下降緣同步。因此，第二開關信號S2及第三開關信號S3中的每一者的每一上升緣與水平同步信號HS的每一上升緣以及耦合雜訊信號NS的每一下降緣及每一上升緣同步，且第二開關信號S2及第三開關信號S3中的每一者的每一下降緣與觸控驅動信號TS的每一上升緣及每一下降緣同步。換句話說，當經由面板佈線L2傳送耦合雜訊信號NS時，關斷第一開關420以防止類比前端410接收耦合雜訊信號NS。 In the embodiment of the present invention, the first switch 420 is used to receive the first switch signal S1, the second switch 430 is used to receive the second switch signal S2, and the third switch 470 is used to receive the third switch signal S3. The first switch signal S1, the second switch signal S2 and the third switch signal S3 are periodic square waves, and the first switch signal S1 and the second switch signal The off signal S2 is inverted. The second switching signal S2 and the third switching signal S3 have the same waveform. Therefore, the second switch 430 and the third switch 470 are turned on during the first periods P1 and P1', and the first switch 420 is turned on during the second periods P2 and P2'. The first period P1 and the second period P2 do not overlap, and the first period P1' and the second period P2' do not overlap. It should be noted that, as shown in FIG. 6 , each falling edge of the first switching signal S1 is synchronized with each rising edge of the horizontal synchronization signal HS and each falling edge and each rising edge of the coupled noise signal NS, and the first Each rising edge of a switch signal S1 is synchronized with each rising edge and each falling edge of the touch driving signal TS. Therefore, each rising edge of each of the second switching signal S2 and the third switching signal S3 is synchronized with each rising edge of the horizontal synchronization signal HS and each falling edge and each rising edge of the coupled noise signal NS , and each falling edge of each of the second switch signal S2 and the third switch signal S3 is synchronized with each rising edge and each falling edge of the touch driving signal TS. In other words, when the coupled noise signal NS is transmitted through the panel wiring L2, the first switch 420 is turned off to prevent the analog front end 410 from receiving the coupled noise signal NS.

因此，如圖6中所示，類比前端電路400可在第一週期P1、P1’期間將耦合雜訊信號NS經由面板佈線L2及第二開關430釋放到參考電壓Vf，且類比前端410用以在第二週期P2期間經由面板佈線L2及第一開關420接收觸控驅動信號TS。如圖6中所示，類比前端410用以在第二週期P2期間在不接收耦合雜訊信號NS或在接收相對低的耦合雜訊信號NS的情況下接收觸控驅動信號TS，以使得在第二週期P2期間類比前端410的輸出端輸出具有電壓Vb的輸出信號Vout2。在本發明實施例中，在下一第一 週期P1’期間通過第三開關470將類比前端410復位(或放電)，且在下一第二週期P2’期間可將類比前端410連續地復位(或放電)。應注意，具有電壓Vb的輸出信號Vout2可代表觸控面板210的觸控感測器的觸控資訊，其中輸出信號Vout2可在週期P1到週期P2’期間在電壓-Vb到電壓Vb之間擺動。換句話說，類比前端電路400可根據圖6的信號波形圖操作，以使得在第二週期P2期間類比前端電路400可輸出具有較高信噪比的輸出信號Vout2。另外，在第二週期P2期間，由於輸出信號Vout2可在電壓-Vb到電壓Vb之間擺動，因此輸出信號Vout2可攜載更多的觸控資訊。電壓Vb例如小於電源電壓+VDD，並且電壓-Vb例如大於電源電壓-VDD。 Therefore, as shown in FIG. 6, the analog front end circuit 400 can release the coupled noise signal NS to the reference voltage Vf through the panel wiring L2 and the second switch 430 during the first periods P1, P1', and the analog front end 410 is used for The touch driving signal TS is received through the panel wiring L2 and the first switch 420 during the second period P2. As shown in FIG. 6 , the analog front end 410 is used to receive the touch driving signal TS without receiving the coupled noise signal NS or with the relatively low coupled noise signal NS during the second period P2, so that the During the second period P2, the output terminal of the analog front end 410 outputs an output signal Vout2 having the voltage Vb. In this embodiment of the present invention, in the next first The analog front end 410 is reset (or discharged) by the third switch 470 during the period P1', and the analog front end 410 may be continuously reset (or discharged) during the next second period P2'. It should be noted that the output signal Vout2 having the voltage Vb can represent the touch information of the touch sensor of the touch panel 210, wherein the output signal Vout2 can swing between the voltage -Vb and the voltage Vb during the period P1 to the period P2' . In other words, the analog front end circuit 400 may operate according to the signal waveform diagram of FIG. 6 , so that the analog front end circuit 400 may output the output signal Vout2 having a higher signal-to-noise ratio during the second period P2. In addition, during the second period P2, since the output signal Vout2 can swing between the voltage -Vb and the voltage Vb, the output signal Vout2 can carry more touch information. The voltage Vb is, for example, smaller than the power supply voltage +VDD, and the voltage -Vb is, for example, greater than the power supply voltage -VDD.

參考圖2、圖5B及圖6，圖6的信號波形亦可適用於圖5B的類比前端電路600。在本發明實施例中，顯示面板220可由水平同步信號HS驅動，因此顯示面板220可同步地產生傳送到類比前端電路600的耦合雜訊信號NS。在本發明實施例中，當通過面板佈線L4傳送耦合雜訊信號NS時，關斷第一開關620以防止類比前端610接收耦合雜訊信號NS。如圖6中所示，類比前端電路600可在第一週期P1、P1’期間將耦合雜訊信號NS通過面板佈線L4及第二開關630釋放到參考電壓Vf1，且類比前端610的第二端用以在第二週期P2期間接收觸控驅動信號TS，以使類比前端610的第一輸出端用以在第二週期P2期間通過第一開關620、面板佈線L4及節點A7發送觸控驅動信號TS至觸控面板210。 Referring to FIG. 2 , FIG. 5B and FIG. 6 , the signal waveforms of FIG. 6 can also be applied to the analog front-end circuit 600 of FIG. 5B . In the embodiment of the present invention, the display panel 220 can be driven by the horizontal synchronization signal HS, so the display panel 220 can synchronously generate the coupled noise signal NS transmitted to the analog front-end circuit 600 . In the embodiment of the present invention, when the coupled noise signal NS is transmitted through the panel wiring L4, the first switch 620 is turned off to prevent the analog front end 610 from receiving the coupled noise signal NS. As shown in FIG. 6 , the analog front end circuit 600 may release the coupled noise signal NS to the reference voltage Vf1 through the panel wiring L4 and the second switch 630 during the first periods P1 and P1 ′, and the second end of the analog front end 610 Used to receive the touch driving signal TS during the second period P2, so that the first output terminal of the analog front end 610 is used to send the touch driving signal through the first switch 620, the panel wiring L4 and the node A7 during the second period P2 TS to the touch panel 210 .

在本發明實施例中，類比前端610用以在第二週期P2期間在不接收耦合雜訊信號NS或在接收相對低的耦合雜訊信號NS的情況下接收觸控驅動信號TS至觸控面板210進行感應，以使得在第二週期P2期間類比前端610的輸出端輸出具有電壓Vb的輸出信號Vout2。在本發明實施例中，在下一第一週期P1’期間通過第三開關670將類比前端610復位(或放電)，且在下一第二週期P2’期間可將類比前端610連續地復位(或放電)。應注意，具有電壓Vb的輸出信號Vout2可代表觸控面板210的觸控感測器的觸控資訊，其中輸出信號Vout2可在週期P1到週期P2’期間在電壓-Vb到電壓Vb之間擺動。換句話說，類比前端電路600可根據圖6的信號波形圖操作，以使得在第二週期P2期間類比前端電路600可輸出具有較高信噪比的輸出信號Vout2。另外，在第二週期P2期間，由於輸出信號Vout2可在電壓-Vb到電壓Vb之間擺動，因此輸出信號Vout2可攜載更多的觸控資訊。電壓Vb例如小於電源電壓+VDD，並且電壓-Vb例如大於電源電壓-VDD。 In the embodiment of the present invention, the analog front end 610 is configured to receive the touch driving signal TS to the touch panel during the second period P2 without receiving the coupled noise signal NS or under the condition of receiving a relatively low coupled noise signal NS 210 senses so that the output terminal of the analog front end 610 outputs the output signal Vout2 having the voltage Vb during the second period P2. In the embodiment of the present invention, the analog front end 610 is reset (or discharged) through the third switch 670 during the next first period P1', and the analog front end 610 can be continuously reset (or discharged) during the next second period P2' ). It should be noted that the output signal Vout2 having the voltage Vb can represent the touch information of the touch sensor of the touch panel 210, wherein the output signal Vout2 can swing between the voltage -Vb and the voltage Vb during the period P1 to the period P2' . In other words, the analog front end circuit 600 may operate according to the signal waveform diagram of FIG. 6 , so that the analog front end circuit 600 may output the output signal Vout2 having a higher signal-to-noise ratio during the second period P2. In addition, during the second period P2, since the output signal Vout2 can swing between the voltage -Vb and the voltage Vb, the output signal Vout2 can carry more touch information. The voltage Vb is, for example, smaller than the power supply voltage +VDD, and the voltage -Vb is, for example, greater than the power supply voltage -VDD.

然而，關於本實施例(圖5B與圖6)的各信號波形特徵可參照上述實施例(圖5A與圖6)可獲致足夠的教示、建議以及實施說明，因此不多加贅述。另外，圖5A及圖5B在適用圖6的信號波形的情況下可分別具有不同的電壓振福，圖6的信號波形僅用於表示各開關的切換結果與各信號波形變化之間的關係，而非限制圖5A及圖5B的類比前端電路400、600採用相同電壓振幅結果來進行運作。 However, regarding the signal waveform characteristics of the present embodiment (FIG. 5B and FIG. 6), reference may be made to the above-mentioned embodiment (FIG. 5A and FIG. 6) to obtain sufficient teachings, suggestions, and implementation descriptions, and thus will not be repeated. In addition, FIGS. 5A and 5B may have different voltage oscillations respectively when the signal waveform of FIG. 6 is applied. The signal waveform of FIG. 6 is only used to represent the relationship between the switching result of each switch and the change of each signal waveform. Without limitation, the analog front-end circuits 400 and 600 of FIGS. 5A and 5B operate with the same voltage amplitude results.

圖7為根據本發明又一實施例的類比前端電路的操作的信號波形圖。參考圖2、圖5A及圖7，圖7的信號波形可適用於圖5A的類比前端電路400。在本發明實施例中，類比前端電路400可與多工器221、222協同發揮作用。在本發明實施例中，顯示面板220可由水平同步信號HS驅動。多工器221可由多工器控制信號MS1控制，且多工器222可由多工器控制信號MS2控制。多工器控制信號MS1、MS2為週期性方波，且多工器控制信號MS1、MS2為反相。因此，如圖7中所示，響應於水平同步信號HS及多工器221、222的開關操作，顯示面板220可同步地產生傳送到類比前端電路400的耦合雜訊信號NS。換句話說，耦合雜訊信號NS可包括來自多工器221、222的開關操作的雜訊。如圖7中所示，耦合雜訊信號NS的每一上升緣及每一下降緣可與多工器控制信號MS1、MS2的每一上升緣及每一下降緣同步。在本發明實施例中，水平同步信號HS的信號週期可與觸控驅動信號TS的信號間隔一預定相位差而同步，即觸控驅動信號TS被移位一預定相位差，以在類比前端410接收觸控驅動信號TS的週期期間防止類比前端410接收耦合雜訊信號NS。 7 is a signal waveform diagram illustrating the operation of an analog front-end circuit according to yet another embodiment of the present invention. Referring to FIG. 2 , FIG. 5A and FIG. 7 , the signal waveforms of FIG. 7 can be applied to the analog front-end circuit 400 of FIG. 5A . In the embodiment of the present invention, the analog front-end circuit 400 may cooperate with the multiplexers 221 and 222 to function. In the embodiment of the present invention, the display panel 220 may be driven by the horizontal synchronization signal HS. The multiplexer 221 may be controlled by the multiplexer control signal MS1, and the multiplexer 222 may be controlled by the multiplexer control signal MS2. The multiplexer control signals MS1 and MS2 are periodic square waves, and the multiplexer control signals MS1 and MS2 are inverted. Therefore, as shown in FIG. 7 , in response to the horizontal synchronization signal HS and the switching operations of the multiplexers 221 and 222 , the display panel 220 can synchronously generate the coupled noise signal NS transmitted to the analog front-end circuit 400 . In other words, the coupled noise signal NS may include noise from the switching operations of the multiplexers 221 , 222 . As shown in FIG. 7, each rising edge and each falling edge of the coupled noise signal NS may be synchronized with each rising edge and each falling edge of the multiplexer control signals MS1, MS2. In the embodiment of the present invention, the signal period of the horizontal synchronization signal HS can be synchronized with the signal of the touch driving signal TS at a predetermined phase difference, that is, the touch driving signal TS is shifted by a predetermined phase difference, so that the analog front end 410 During the period of receiving the touch driving signal TS, the analog front end 410 is prevented from receiving the coupled noise signal NS.

在本發明實施例中，第一開關420用以接收第一開關信號S1，第二開關430用以接收第二開關信號S2，且第三開關470用以接收第三開關信號S3。第一開關信號S1、第二開關信號S2及第三開關信號S3為週期性方波，且第一開關信號S1與第二開關信號S2為反相。第二開關信號S2與第三開關信號S3具有相同 的波形。因此，第二開關430及第三開關470在第一週期P1、P1’期間導通，且第一開關420在第二週期P2、P2’期間導通。第一週期P1、P1’與第二週期P2、P2’未重疊。應注意，如圖7中所示，第一開關信號S1的下降緣與水平同步信號HS的上升緣同步，且第一開關信號S1的每一上升緣與觸控驅動信號TS的每一上升緣及每一下降緣同步。此外，第一開關信號S1的每一下降緣與多工器控制信號MS1、MS2的每一下降緣及每一上升緣以及耦合雜訊信號NS的每一下降緣及每一上升緣同步。因此，第二開關信號S2的上升緣及第三開關信號S3的上升緣與水平同步信號HS的每一上升緣同步，且第二開關信號S2的每一下降緣及第三開關信號S3的每一下降緣與觸控驅動信號TS的每一上升緣及每一下降緣同步。此外，第二開關信號S2的每一上升緣及第三開關信號S3的每一上升緣與多工器控制信號MS1、MS2的每一上升緣及每一下降緣以及耦合雜訊信號NS的每一上升緣及每一下降緣同步。換句話說，當通過面板佈線L2傳送耦合雜訊信號NS時，關斷第一開關420以防止類比前端410接收耦合雜訊信號NS。 In the embodiment of the present invention, the first switch 420 is used to receive the first switch signal S1, the second switch 430 is used to receive the second switch signal S2, and the third switch 470 is used to receive the third switch signal S3. The first switching signal S1 , the second switching signal S2 and the third switching signal S3 are periodic square waves, and the first switching signal S1 and the second switching signal S2 are inverted. The second switch signal S2 and the third switch signal S3 have the same waveform. Therefore, the second switch 430 and the third switch 470 are turned on during the first periods P1, P1', and the first switch 420 is turned on during the second periods P2, P2'. The first period P1, P1' does not overlap with the second period P2, P2'. It should be noted that, as shown in FIG. 7 , the falling edge of the first switching signal S1 is synchronized with the rising edge of the horizontal synchronization signal HS, and each rising edge of the first switching signal S1 is synchronized with each rising edge of the touch driving signal TS and every falling edge synchronization. In addition, each falling edge of the first switching signal S1 is synchronized with each falling edge and each rising edge of the multiplexer control signals MS1 and MS2 and each falling edge and each rising edge of the coupled noise signal NS. Therefore, the rising edge of the second switching signal S2 and the rising edge of the third switching signal S3 are synchronized with each rising edge of the horizontal synchronization signal HS, and each falling edge of the second switching signal S2 and each falling edge of the third switching signal S3 A falling edge is synchronized with each rising edge and each falling edge of the touch driving signal TS. In addition, each rising edge of the second switching signal S2 and each rising edge of the third switching signal S3 and each rising edge and each falling edge of the multiplexer control signals MS1 and MS2 and each rising edge of the coupled noise signal NS A rising edge and every falling edge are synchronized. In other words, when the coupled noise signal NS is transmitted through the panel wiring L2, the first switch 420 is turned off to prevent the analog front end 410 from receiving the coupled noise signal NS.

因此，如圖7中所示，類比前端電路400可在第一週期P1、P1’期間將耦合雜訊信號NS經由面板佈線L2及第二開關430釋放到參考電壓Vf，且類比前端410用以在第二週期P2期間經由面板佈線L2及第一開關420接收觸控驅動信號TS。如圖7中所示，類比前端410用以在第二週期P2期間在不接收耦合雜訊信號NS或在接收相對低的耦合雜訊信號NS的情況下接收觸控驅動 信號TS，以使得在第二週期P2期間類比前端410的輸出端輸出具有電壓Vb的輸出信號Vout2。在本發明實施例中，在下一第一週期P1’期間通過第三開關470將類比前端410復位(或放電)，且在下一第二週期P2’期間將類比前端410可連續地復位(或放電)。應注意，具有電壓Vb的輸出信號Vout2可代表觸控面板210的觸控感測器的觸控資訊，其中輸出信號Vout2可在電壓-Vb到電壓Vb之間擺動。換句話說，類比前端電路400可根據圖7的信號波形圖操作，以使得在第二週期P2期間類比前端電路400可輸出具有較高信噪比的輸出信號Vout2。另外，在第二週期P2期間，由於輸出信號Vout2可在電壓-Vb到電壓Vb之間擺動，因此輸出信號Vout2可攜載更多的觸控資訊。 Therefore, as shown in FIG. 7 , the analog front end circuit 400 can release the coupled noise signal NS to the reference voltage Vf through the panel wiring L2 and the second switch 430 during the first periods P1 and P1 ′, and the analog front end 410 is used for The touch driving signal TS is received through the panel wiring L2 and the first switch 420 during the second period P2. As shown in FIG. 7 , the analog front end 410 is used to receive touch driving without receiving the coupled noise signal NS or with receiving a relatively low coupled noise signal NS during the second period P2 signal TS, so that the output terminal of the analog front end 410 outputs the output signal Vout2 having the voltage Vb during the second period P2. In the embodiment of the present invention, the analog front end 410 is reset (or discharged) through the third switch 470 during the next first period P1', and the analog front end 410 may be continuously reset (or discharged) during the next second period P2'. ). It should be noted that the output signal Vout2 having the voltage Vb can represent the touch information of the touch sensor of the touch panel 210, wherein the output signal Vout2 can swing between the voltage -Vb and the voltage Vb. In other words, the analog front end circuit 400 may operate according to the signal waveform diagram of FIG. 7 , so that the analog front end circuit 400 may output the output signal Vout2 having a higher signal-to-noise ratio during the second period P2. In addition, during the second period P2, since the output signal Vout2 can swing between the voltage -Vb and the voltage Vb, the output signal Vout2 can carry more touch information.

參考圖2、圖5B及圖7，圖7的信號波形可適用於圖5B的類比前端電路600。在本發明實施例中，類比前端電路600可與多工器221、222協同發揮作用。在本發明實施例中，顯示面板220可由水平同步信號HS驅動。多工器221可由多工器控制信號MS1控制，且多工器222可由多工器控制信號MS2控制。在本發明實施例中，響應於水平同步信號HS及多工器221、222的開關操作，顯示面板220可同步地產生傳送到類比前端電路600的耦合雜訊信號NS。換句話說，耦合雜訊信號NS可包括來自多工器221、222的開關操作的雜訊。在本發明實施例中，當通過面板佈線L4傳送耦合雜訊信號NS時，關斷第一開關620以防止類比前端610接收耦合雜訊信號NS。 Referring to FIG. 2 , FIG. 5B and FIG. 7 , the signal waveforms of FIG. 7 can be applied to the analog front-end circuit 600 of FIG. 5B . In the embodiment of the present invention, the analog front-end circuit 600 may cooperate with the multiplexers 221 and 222 to function. In the embodiment of the present invention, the display panel 220 may be driven by the horizontal synchronization signal HS. The multiplexer 221 may be controlled by the multiplexer control signal MS1, and the multiplexer 222 may be controlled by the multiplexer control signal MS2. In the embodiment of the present invention, in response to the horizontal synchronization signal HS and the switching operations of the multiplexers 221 and 222 , the display panel 220 can synchronously generate the coupled noise signal NS transmitted to the analog front-end circuit 600 . In other words, the coupled noise signal NS may include noise from the switching operations of the multiplexers 221 , 222 . In the embodiment of the present invention, when the coupled noise signal NS is transmitted through the panel wiring L4, the first switch 620 is turned off to prevent the analog front end 610 from receiving the coupled noise signal NS.

在本發明實施例中，類比前端610的第一端用以在第二週期P2期間在不接收耦合雜訊信號NS或在接收相對低的耦合雜訊信號NS的情況下發送觸控驅動信號TS至觸控面板210進行感應，以使得在第二週期P2期間類比前端610的輸出端輸出具有電壓Vb的輸出信號Vout2。在本發明實施例中，在下一第一週期P1’期間通過第三開關670將類比前端610復位(或放電)，且在下一第二週期P2’期間將類比前端610可連續地復位(或放電)。應注意，具有電壓Vb的輸出信號Vout2可代表觸控面板210的觸控感測器的觸控資訊，其中輸出信號Vout2可在電壓-Vb到電壓Vb之間擺動。換句話說，類比前端電路600可根據圖7的信號波形圖操作，以使得在第二週期P2期間類比前端電路600可輸出具有較高信噪比的輸出信號Vout2。另外，在第二週期P2期間，由於輸出信號Vout2可在電壓-Vb到電壓Vb之間擺動，因此輸出信號Vout2可攜載更多的觸控資訊。 In the embodiment of the present invention, the first end of the analog front end 610 is used for sending the touch driving signal TS without receiving the coupled noise signal NS or receiving the relatively low coupled noise signal NS during the second period P2 The touch panel 210 is sensed, so that the output terminal of the analog front end 610 outputs the output signal Vout2 with the voltage Vb during the second period P2. In the embodiment of the present invention, the analog front end 610 is reset (or discharged) through the third switch 670 during the next first period P1', and the analog front end 610 may be continuously reset (or discharged) during the next second period P2'. ). It should be noted that the output signal Vout2 having the voltage Vb can represent the touch information of the touch sensor of the touch panel 210, wherein the output signal Vout2 can swing between the voltage -Vb and the voltage Vb. In other words, the analog front end circuit 600 may operate according to the signal waveform diagram of FIG. 7 , so that the analog front end circuit 600 may output the output signal Vout2 having a higher signal-to-noise ratio during the second period P2. In addition, during the second period P2, since the output signal Vout2 can swing between the voltage -Vb and the voltage Vb, the output signal Vout2 can carry more touch information.

然而，關於本實施例(圖5B與圖7)的各信號波形特徵可參照上述實施例(圖5A與圖7)可獲致足夠的教示、建議以及實施說明，因此不多加贅述。另外，圖5A及圖5B在適用圖7的信號波形的情況下可分別具有不同的電壓振福，圖7的信號波形僅用於表示各關開切換結果與各信號波形變化之間的關係，而非限制圖5A及圖5B的類比前端電路400、600採用相同電壓振幅結果來進行運作。 However, regarding the characteristics of the signal waveforms of the present embodiment (FIG. 5B and FIG. 7), reference can be made to the above-mentioned embodiments (FIG. 5A and FIG. 7) to obtain sufficient teachings, suggestions and implementation descriptions, so detailed descriptions are omitted. In addition, FIGS. 5A and 5B may have different voltage vibrations respectively when the signal waveform of FIG. 7 is applied. The signal waveform of FIG. 7 is only used to represent the relationship between the switching results of each switch and the change of each signal waveform. Without limitation, the analog front-end circuits 400 and 600 of FIGS. 5A and 5B operate with the same voltage amplitude results.

圖8為根據本發明再一實施例的類比前端電路的操作的 信號波形圖。參考圖2、圖5A及圖8，在本發明實施例中，類比前端電路400可與圖2接收發射信號ES的電晶體232協同發揮作用。在本發明實施例中，像素單元230可由發射信號ES驅動。應注意，由於觸控面板210的畫面更新速率高於顯示面板220的畫面更新速率，因此發射信號ES的一個信號週期長於觸控驅動信號TS的一個信號週期。因此，如圖8中所示，響應於發射信號ES，顯示面板220可同步地產生傳送到類比前端電路400的耦合雜訊信號NS。換句話說，耦合雜訊信號NS可包括來自像素單元230的驅動操作的雜訊。如圖8中所示，耦合雜訊信號NS的每一上升緣及每一下降緣可與發射信號ES的每一上升緣及每一下降緣同步。在本發明實施例中，發射信號ES的信號週期可與觸控驅動信號TS的信號週期的N倍同步且間隔一預定相位差，即觸控驅動信號TS的波形可被移位一預定相位差，以在類比前端410接收觸控驅動信號TS的週期期間防止類比前端410接收耦合雜訊信號NS，其中N為正整數。 FIG. 8 is a diagram illustrating the operation of an analog front-end circuit according to yet another embodiment of the present invention. Signal waveform diagram. Referring to FIG. 2 , FIG. 5A , and FIG. 8 , in an embodiment of the present invention, the analog front-end circuit 400 can cooperate with the transistor 232 in FIG. 2 for receiving and transmitting the signal ES. In the embodiment of the present invention, the pixel unit 230 can be driven by the emission signal ES. It should be noted that since the frame refresh rate of the touch panel 210 is higher than that of the display panel 220, one signal period of the emission signal ES is longer than one signal period of the touch driving signal TS. Therefore, as shown in FIG. 8 , in response to the emission signal ES, the display panel 220 may synchronously generate the coupled noise signal NS transmitted to the analog front-end circuit 400 . In other words, the coupled noise signal NS may include noise from the driving operation of the pixel unit 230 . As shown in FIG. 8, each rising edge and each falling edge of the coupled noise signal NS may be synchronized with each rising edge and each falling edge of the transmit signal ES. In the embodiment of the present invention, the signal period of the emission signal ES can be synchronized with N times the signal period of the touch driving signal TS and separated by a predetermined phase difference, that is, the waveform of the touch driving signal TS can be shifted by a predetermined phase difference , so as to prevent the analog front end 410 from receiving the coupled noise signal NS during the period in which the analog front end 410 receives the touch driving signal TS, where N is a positive integer.

在本發明實施例中，第一開關420用以接收第一開關信號S1，第二開關430用以接收第二開關信號S2，且第三開關470用以接收第三開關信號S3。第一開關信號S1、第二開關信號S2及第三開關信號S3為週期性方波，且第一開關信號S1與第二開關信號S2為反相。第二開關信號S2與第三開關信號S3具有相同的波形。因此，第二開關430及第三開關470在第一週期P1、P1’期間導通，且第一開關420在第二週期(類似於圖6或圖7所示 第二週期P2、P2’)期間導通。第一週期P1、P1’及上述第二週期未重疊。應注意，如圖8中所示，第一開關信號S1的每一第N下降緣與發射信號ES的每一下降緣及每一上升緣以及耦合雜訊信號NS的每一下降緣及每一上升緣同步，且第一開關信號S1的每一上升緣與觸控驅動信號TS的每一下降緣及每一上升緣同步，其中所述N為正整數。因此，第二開關信號S2及第三開關信號S3中的每一者的每一第N上升緣與發射信號ES的每一下降緣及每一上升緣以及耦合雜訊信號NS的每一下降緣及每一上升緣同步，且第二開關信號S2及第三開關信號S3中的每一者的每一下降緣與觸控驅動信號TS的每一下降緣及每一上升緣同步。換句話說，當經由面板佈線L2傳送耦合雜訊信號NS時，關斷第一開關420以防止類比前端410接收耦合雜訊信號NS。 In the embodiment of the present invention, the first switch 420 is used to receive the first switch signal S1, the second switch 430 is used to receive the second switch signal S2, and the third switch 470 is used to receive the third switch signal S3. The first switching signal S1 , the second switching signal S2 and the third switching signal S3 are periodic square waves, and the first switching signal S1 and the second switching signal S2 are inverted. The second switching signal S2 and the third switching signal S3 have the same waveform. Therefore, the second switch 430 and the third switch 470 are turned on during the first period P1, P1', and the first switch 420 is turned on during the second period (similar to that shown in FIG. 6 or FIG. 7 ) is turned on during the second period P2, P2'). The first period P1, P1' and the above-mentioned second period do not overlap. It should be noted that, as shown in FIG. 8 , each Nth falling edge of the first switching signal S1 and each falling edge and each rising edge of the transmit signal ES and each falling edge and each falling edge of the coupled noise signal NS The rising edges are synchronized, and each rising edge of the first switching signal S1 is synchronized with each falling edge and each rising edge of the touch driving signal TS, wherein the N is a positive integer. Therefore, each Nth rising edge of each of the second switching signal S2 and the third switching signal S3 and each falling edge and each rising edge of the transmit signal ES and each falling edge of the coupled noise signal NS and each rising edge, and each falling edge of each of the second switch signal S2 and the third switch signal S3 is synchronized with each falling edge and each rising edge of the touch driving signal TS. In other words, when the coupled noise signal NS is transmitted through the panel wiring L2, the first switch 420 is turned off to prevent the analog front end 410 from receiving the coupled noise signal NS.

因此，如圖8中所示，類比前端電路400可在第一週期P1、P1’期間將耦合雜訊信號NS經由面板佈線L2及第二開關430釋放到參考電壓Vf，且類比前端410用以在第二週期(類似於圖6或圖7所示第二週期P2)期間經由面板佈線L2及第一開關420接收觸控驅動信號TS。如圖8中所示，類比前端410用以在第二週期(類似於圖6或圖7所示第二週期P2)期間在不接收耦合雜訊信號NS或在接收相對低的耦合雜訊信號NS的情況下接收觸控驅動信號TS，以使得在第二週期(類似於圖6或圖7所示第二週期P2)期間類比前端410的輸出端輸出具有電壓Vb的輸出信號Vout2。在本發明實施例中，在下一第一週期P1’期間通過第三開 關470將類比前端410復位(或放電)，且可在下一第二週期(類似於圖6或圖7所示第二週期P2’)期間將類比前端410連續地復位(或放電)。應注意，具有電壓Vb的輸出信號Vout2可代表觸控面板210的觸控感測器的觸控資訊，其中輸出信號Vout2可在電壓-Vb到電壓Vb之間擺動。換句話說，類比前端電路400可根據圖8的信號波形圖操作，以使得在第二週期P2(類似於圖6或圖7所示第二週期P2)期間類比前端電路400可輸出具有較高信噪比的輸出信號Vout2。另外，在第二週期P2期間，由於輸出信號Vout2可在電壓-Vb到電壓Vb之間擺動，因此輸出信號Vout2可攜載更多的觸控資訊。 Therefore, as shown in FIG. 8, the analog front end circuit 400 can release the coupled noise signal NS to the reference voltage Vf through the panel wiring L2 and the second switch 430 during the first periods P1, P1', and the analog front end 410 is used for The touch driving signal TS is received through the panel wiring L2 and the first switch 420 during the second period (similar to the second period P2 shown in FIG. 6 or FIG. 7 ). As shown in FIG. 8 , the analog front end 410 is used to receive no coupled noise signal NS or a relatively low coupled noise signal during the second period (similar to the second period P2 shown in FIG. 6 or FIG. 7 ). In the case of NS, the touch driving signal TS is received, so that the output terminal of the analog front end 410 outputs the output signal Vout2 with the voltage Vb during the second period (similar to the second period P2 shown in FIG. 6 or FIG. 7 ). In the embodiment of the present invention, during the next first period P1', through the third opening Shutdown 470 resets (or discharges) analog front end 410 and can continuously reset (or discharge) analog front end 410 during the next second cycle (similar to second cycle P2' shown in Figure 6 or Figure 7). It should be noted that the output signal Vout2 having the voltage Vb can represent the touch information of the touch sensor of the touch panel 210, wherein the output signal Vout2 can swing between the voltage -Vb and the voltage Vb. In other words, the analog front-end circuit 400 may operate according to the signal waveform diagram of FIG. 8 , so that the analog front-end circuit 400 may output a higher output signal during the second period P2 (similar to the second period P2 shown in FIG. 6 or FIG. 7 ). Signal-to-noise ratio of the output signal Vout2. In addition, during the second period P2, since the output signal Vout2 can swing between the voltage -Vb and the voltage Vb, the output signal Vout2 can carry more touch information.

參考圖2、圖5B及圖8，圖8的信號波形亦可適用於圖5B的類比前端電路600。在本發明實施例中，類比前端電路600可與接收發射信號ES的電晶體232協同發揮作用。在本發明實施例中，像素單元230可由發射信號ES驅動。應注意，由於觸控面板210的畫面更新速率高於顯示面板220的畫面更新速率，因此發射信號ES的一個信號週期長於觸控驅動信號TS的一個信號週期。在本發明實施例中，響應於發射信號ES，顯示面板220可同步地產生傳送到類比前端電路600的耦合雜訊信號NS。換句話說，耦合雜訊信號NS可包括來自像素單元230的驅動操作的雜訊。在本發明實施例中，當通過面板佈線L4傳送耦合雜訊信號NS時，關斷第一開關620以防止類比前端610接收耦合雜訊信號NS。 Referring to FIG. 2 , FIG. 5B and FIG. 8 , the signal waveforms of FIG. 8 can also be applied to the analog front-end circuit 600 of FIG. 5B . In the embodiment of the present invention, the analog front-end circuit 600 may cooperate with the transistor 232 for receiving the transmit signal ES. In the embodiment of the present invention, the pixel unit 230 can be driven by the emission signal ES. It should be noted that since the frame refresh rate of the touch panel 210 is higher than that of the display panel 220, one signal period of the emission signal ES is longer than one signal period of the touch driving signal TS. In the embodiment of the present invention, in response to the transmit signal ES, the display panel 220 may synchronously generate the coupled noise signal NS transmitted to the analog front-end circuit 600 . In other words, the coupled noise signal NS may include noise from the driving operation of the pixel unit 230 . In the embodiment of the present invention, when the coupled noise signal NS is transmitted through the panel wiring L4, the first switch 620 is turned off to prevent the analog front end 610 from receiving the coupled noise signal NS.

在本發明實施例中，類比前端610的第一端用以在第二週期(類似於圖6或圖7所示第二週期P2)期間在不接收耦合雜訊信號NS或在接收相對低的耦合雜訊信號NS的情況下發送觸控驅動信號TS至觸控面板210進行感應，以使得在第二週期(類似於圖6或圖7所示第二週期P2)期間類比前端610的輸出端輸出具有電壓Vb的輸出信號Vout2。在本發明實施例中，在下一第一週期P1’期間通過第三開關470將類比前端410復位(或放電)，且可在下一第二週期(類似於圖6或圖7所示第二週期P2’)期間將類比前端410連續地復位(或放電)。應注意，具有電壓Vb的輸出信號Vout2可代表觸控面板210的觸控感測器的觸控資訊，其中輸出信號Vout2可在電壓-Vb到電壓Vb之間擺動。換句話說，類比前端電路600可根據圖8的信號波形圖操作，以使得在第二週期P2(類似於圖6或圖7所示第二週期P2)期間類比前端電路600可輸出具有較高信噪比的輸出信號Vout2。另外，在第二週期P2期間，由於輸出信號Vout2可在電壓-Vb到電壓Vb之間擺動，因此輸出信號Vout2可攜載更多的觸控資訊。 In the embodiment of the present invention, the first end of the analog front end 610 is used to not receive the coupled noise signal NS or receive a relatively low noise signal NS during the second period (similar to the second period P2 shown in FIG. 6 or FIG. 7 ). In the case of coupling the noise signal NS, the touch driving signal TS is sent to the touch panel 210 for sensing, so that the output terminal of the analog front end 610 is analogous during the second period (similar to the second period P2 shown in FIG. 6 or FIG. 7 ). The output signal Vout2 having the voltage Vb is output. In the embodiment of the present invention, the analog front end 410 is reset (or discharged) through the third switch 470 during the next first period P1 ′, and the analog front end 410 can be reset (or discharged) in the next second period (similar to the second period shown in FIG. 6 or FIG. 7 ) The analog front end 410 is continuously reset (or discharged) during P2'). It should be noted that the output signal Vout2 having the voltage Vb can represent the touch information of the touch sensor of the touch panel 210, wherein the output signal Vout2 can swing between the voltage -Vb and the voltage Vb. In other words, the analog front-end circuit 600 may operate according to the signal waveform diagram of FIG. 8 , so that the analog front-end circuit 600 may output a higher output signal during the second period P2 (similar to the second period P2 shown in FIG. 6 or FIG. 7 ). Signal-to-noise ratio of the output signal Vout2. In addition, during the second period P2, since the output signal Vout2 can swing between the voltage -Vb and the voltage Vb, the output signal Vout2 can carry more touch information.

然而，關於本實施例(圖5B與圖8)的各信號波形特徵可參照上述實施例(圖5A與圖8)可獲致足夠的教示、建議以及實施說明，因此不多加贅述。另外，圖5A及圖5B在適用圖8的信號波形的情況下可分別具有不同的電壓振福，圖8的信號波形僅用於表示各關開切換結果與各信號波形變化之間的關係，而非限制圖5A及圖5B的類比前端電路400、600採用相同電壓振幅結果來 進行運作。 However, regarding the signal waveform characteristics of the present embodiment (FIG. 5B and FIG. 8), reference can be made to the above-mentioned embodiment (FIG. 5A and FIG. 8) to obtain sufficient teachings, suggestions, and implementation descriptions, and thus will not be repeated. In addition, FIGS. 5A and 5B may have different voltage vibrations respectively when the signal waveform of FIG. 8 is applied. The signal waveform of FIG. 8 is only used to represent the relationship between the switching results of each switch and the change of each signal waveform. Rather than limiting, the analog front-end circuits 400 and 600 of FIGS. 5A and 5B use the same voltage amplitude results to generate to operate.

應注意，在本發明的一些實施例中，圖7及圖8的信號波形圖也可適用於圖3A及圖3B的類比前端電路300、500，但第三開關信號S3的信號波形除外。此外，基於圖4、圖6到圖8的實施例的教示，在本發明的另一些實施例中，圖3A及圖3B所示類比前端電路300、500或圖5A及圖5B所示類比前端電路400、600中的開關也可與水平同步信號協同發揮作用，以使多工器與電晶體同步地接收發射信號。 It should be noted that, in some embodiments of the present invention, the signal waveform diagrams of FIGS. 7 and 8 are also applicable to the analog front-end circuits 300 and 500 of FIGS. 3A and 3B , except for the signal waveform of the third switch signal S3 . In addition, based on the teachings of the embodiments of FIGS. 4 , 6 to 8 , in other embodiments of the present invention, the analog front-end circuits 300 and 500 shown in FIGS. 3A and 3B or the analog front-end circuits shown in FIGS. 5A and 5B The switches in the circuits 400, 600 may also function in conjunction with the horizontal synchronization signal to allow the multiplexer to receive the transmit signal in synchronization with the transistor.

圖9為本發明一實施例的操作方法的流程圖。參考圖2、圖3A及圖9，本實施例的操作方法可適合於圖3A、圖3B、圖5A及圖5B所示的類比前端電路300、400、500、600。然而，以下說明以圖3A類比前端電路300為範例。在步驟S910中，在第一週期期間類比前端電路300導通第二開關330。在步驟S920中，在第一週期期間，將來自顯示面板220的耦合雜訊信號NS經由面板佈線L1及第二開關330傳送到參考電壓Vf。在步驟S930中，在第二週期期間類比前端電路300導通第一開關320。在步驟S940中，在第二週期期間，類比前端310的輸入端接收觸控驅動信號TS。在本發明實施例中，第一週期與第二週期未重疊。因此，執行步驟S910到S940的類比前端電路300可通過控制第一開關320及第二開關330的導通狀態防止類比前端310接收耦合雜訊信號NS。 FIG. 9 is a flowchart of an operating method according to an embodiment of the present invention. Referring to FIG. 2 , FIG. 3A and FIG. 9 , the operation method of this embodiment may be suitable for the analog front-end circuits 300 , 400 , 500 and 600 shown in FIGS. 3A , 3B, 5A and 5B. However, the following description takes the analog front-end circuit 300 of FIG. 3A as an example. In step S910, the analog front-end circuit 300 turns on the second switch 330 during the first period. In step S920 , during the first period, the coupled noise signal NS from the display panel 220 is transmitted to the reference voltage Vf through the panel wiring L1 and the second switch 330 . In step S930, the analog front-end circuit 300 turns on the first switch 320 during the second period. In step S940, during the second period, the input terminal of the analog front end 310 receives the touch driving signal TS. In this embodiment of the present invention, the first period and the second period do not overlap. Therefore, the analog front end circuit 300 performing steps S910 to S940 can prevent the analog front end 310 from receiving the coupled noise signal NS by controlling the conduction states of the first switch 320 and the second switch 330 .

另外，類比前端電路300的相關電路特徵、實施細節及 相關技術特徵可依據上述圖1至圖8實施例的說明而可獲致足夠的教示、建議以及實施說明，因此不多加贅述。並且，類比於上述以圖3A為範例的說明，上述步驟S910到S940亦可適用於由圖3B、圖5A及圖5B的類比前端電路400、500、600來執行之，而也不多加贅述。 In addition, the related circuit features, implementation details of the analog front-end circuit 300 and Regarding the related technical features, sufficient teachings, suggestions and implementation descriptions can be obtained according to the descriptions of the above-mentioned embodiments in FIGS. In addition, analogous to the above description using FIG. 3A as an example, the above steps S910 to S940 are also applicable to be performed by the analog front-end circuits 400 , 500 and 600 of FIGS. 3B , 5A and 5B , and will not be repeated here.

綜上所述，根據本發明的用於觸控控制器的類比前端電路及其操作方法，通過控制設置在面板佈線與類比前端之間的開關的導通狀態，類比前端電路可在所述類比前端電路接收觸控驅動信號時有效地避免接收由顯示面板產生的雜訊信號。此外，在本發明的一些實施例中，類比前端電路的輸出信號可還具有寬的電壓擺幅以攜載更多的觸控資訊。 To sum up, according to the analog front-end circuit for a touch controller and the operation method thereof of the present invention, by controlling the conduction state of the switch arranged between the panel wiring and the analog front-end, the analog front-end circuit can be used in the analog front-end. When the circuit receives the touch driving signal, it can effectively avoid receiving the noise signal generated by the display panel. In addition, in some embodiments of the present invention, the output signal of the analog front-end circuit may further have a wide voltage swing to carry more touch information.

所屬領域的技術人員應明瞭，可對所本發明實施例做出各種潤飾及變化，而這不背離本發明的範圍或精神。鑒於前述內容，本發明旨在涵蓋各種潤飾及變化，只要這些潤飾及變化處於隨附權利要求書及其等效內容的範圍內即可。 It will be apparent to those skilled in the art that various modifications and changes can be made to the embodiments of the present invention without departing from the scope or spirit of the invention. In view of the foregoing, the present invention is intended to cover various modifications and variations provided that they are within the scope of the appended claims and their equivalents.

300:類比前端電路300: Analog Front-End Circuits

310:類比前端310: Analogy Front End

320:第一開關320: First switch

330:第二開關330: Second switch

340:等效電阻340: Equivalent resistance

350、360:等效電容350, 360: Equivalent capacitance

A1、A2:節點A1, A2: Node

L1:面板佈線L1: Panel wiring

TS:觸控驅動信號TS: touch drive signal

NS:耦合雜訊信號NS: coupled noise signal

Vf:參考電壓Vf: reference voltage

Vout1:輸出信號Vout1: output signal

Claims (32)

一種用於觸控控制器的類比前端電路，包括：一類比前端，包括一輸入端及一輸出端；一第一開關，包括一第一端及一第二端，其中所述第一開關的所述第一端耦接至所述類比前端的所述輸入端，且所述第一開關的所述第二端用以耦接至一面板佈線；以及一第二開關，包括一第一端及一第二端，其中所述第二開關的所述第一端耦接至所述第一開關的所述第二端，且所述第二開關的所述第二端耦接至一參考電壓，其中所述第一開關用以接收一第一開關信號，且所述第二開關用以接收一第二開關信號，其中所述第一開關信號及所述第二開關信號是一週期性方波，且所述第一開關信號與所述第二開關信號為反相。 An analog front-end circuit for a touch controller, comprising: an analog front-end, including an input end and an output end; a first switch, including a first end and a second end, wherein the first switch the first terminal is coupled to the input terminal of the analog front end, and the second terminal of the first switch is used for coupling to a panel wiring; and a second switch includes a first terminal and a second terminal, wherein the first terminal of the second switch is coupled to the second terminal of the first switch, and the second terminal of the second switch is coupled to a reference voltage, wherein the first switch is used to receive a first switch signal, and the second switch is used to receive a second switch signal, wherein the first switch signal and the second switch signal are a periodic square wave, and the first switch signal and the second switch signal are in opposite phases. 如請求項1所述的類比前端電路，其中所述第二開關在一第一週期期間導通，且所述第一開關在一第二週期期間導通，其中所述第一週期與所述第二週期未重疊。 The analog front-end circuit of claim 1, wherein the second switch is turned on during a first period, and the first switch is turned on during a second period, wherein the first period and the second period Periods do not overlap. 如請求項1所述的類比前端電路，其中所述面板佈線還耦接至一觸控面板及一顯示面板，且所述類比前端的所述輸入端接收一觸控驅動信號。 The analog front-end circuit of claim 1, wherein the panel wiring is further coupled to a touch panel and a display panel, and the input end of the analog front-end receives a touch driving signal. 如請求項3所述的類比前端電路，其中所述顯示面板為一微發光二極體顯示器。 The analog front-end circuit according to claim 3, wherein the display panel is a micro-LED display. 如請求項3所述的類比前端電路，其中所述觸控面板為一互容式觸控面板或一自容式觸控面板。 The analog front-end circuit of claim 3, wherein the touch panel is a mutual capacitive touch panel or a self capacitive touch panel. 如請求項3所述的類比前端電路，其中所述觸控驅動信號的每一相鄰的一上升緣與一下降緣與所述顯示面板的一水平同步信號間隔一預定相位差而同步。 The analog front-end circuit of claim 3, wherein each adjacent rising edge and a falling edge of the touch driving signal are synchronized with a horizontal synchronization signal of the display panel with a predetermined phase difference. 如請求項6所述的類比前端電路，其中所述第一開關信號的每一下降緣與所述水平同步信號的每一上升緣同步。 The analog front-end circuit of claim 6, wherein each falling edge of the first switch signal is synchronized with each rising edge of the horizontal synchronization signal. 如請求項3所述的類比前端電路，其中所述第一開關信號的每一上升緣與所述觸控驅動信號的每一上升緣及每一下降緣同步。 The analog front-end circuit of claim 3, wherein each rising edge of the first switch signal is synchronized with each rising edge and each falling edge of the touch driving signal. 如請求項3所述的類比前端電路，其中在所述第一週期期間，來自所述顯示面板的一耦合雜訊信號經由所述面板佈線及所述第二開關傳送到所述參考電壓。 The analog front-end circuit of claim 3, wherein during the first period, a coupled noise signal from the display panel is transmitted to the reference voltage via the panel wiring and the second switch. 如請求項9所述的類比前端電路，其中所述第一開關信號的每一下降緣與所述顯示面板的所述耦合雜訊信號的每一上升緣及每一下降緣同步。 The analog front-end circuit of claim 9, wherein each falling edge of the first switching signal is synchronized with each rising edge and each falling edge of the coupled noise signal of the display panel. 如請求項3所述的類比前端電路，其中所述顯示面板的一水平同步信號的一信號週期可與所述觸控驅動信號的一信號週期間隔一預定相位差而同步。 The analog front-end circuit of claim 3, wherein a signal period of a horizontal synchronization signal of the display panel can be synchronized with a signal period of the touch driving signal at a predetermined phase difference. 如請求項3所述的類比前端電路，其中所述第一開關信號的每一下降緣與所述顯示面板的一多工器控制信號的每一上升緣及每一下降緣同步。 The analog front-end circuit of claim 3, wherein each falling edge of the first switch signal is synchronized with each rising edge and each falling edge of a multiplexer control signal of the display panel. 如請求項3所述的類比前端電路，其中所述觸控驅動信號的一信號週期的N倍同步所述顯示面板的一發射信號的一信號週期，其中N為正整數。 The analog front-end circuit of claim 3, wherein N times a signal period of the touch driving signal synchronizes a signal period of an emission signal of the display panel, wherein N is a positive integer. 如請求項13所述的類比前端電路，其中所述第一開關信號的每一第N下降緣與所述發射信號的每一下降緣及每一上升緣同步。 The analog front-end circuit of claim 13, wherein each Nth falling edge of the first switch signal is synchronized with each falling edge and each rising edge of the transmit signal. 如請求項3所述的類比前端電路，其中所述類比前端的所述輸入端在所述第二週期期間通過所述面板佈線及所述第一開關接收所述觸控面板的所述觸控驅動信號。 The analog front-end circuit of claim 3, wherein the input terminal of the analog front-end receives the touch of the touch panel through the panel wiring and the first switch during the second period drive signal. 如請求項3所述的類比前端電路，其中所述類比前端的所述輸入端包括一第一輸入端以及一第二輸入端，其中所述類比前端的所述第二輸入端在所述第二週期期間接收所述觸控驅動信號，並且所述類比前端的所述第一輸入端在所述第二週期期間通過所述面板佈線及所述第一開關發送所述觸控驅動信號至所述觸控面板。 The analog front-end circuit according to claim 3, wherein the input terminal of the analog front-end includes a first input terminal and a second input terminal, wherein the second input terminal of the analog front-end is in the first input terminal. The touch drive signal is received during two cycles, and the first input terminal of the analog front end sends the touch drive signal to the touch drive signal through the panel wiring and the first switch during the second cycle the touch panel. 如請求項1所述的類比前端電路，其中還包括：一第三開關，包括一第一端及一第二端，其中所述第三開關的所述第一端耦接至所述類比前端的所述輸入端且所述第三開關的所述第二端耦接至所述類比前端的所述輸出端，其中所述第三開關與所述第二開關同步地進行開關。 The analog front-end circuit of claim 1, further comprising: a third switch including a first terminal and a second terminal, wherein the first terminal of the third switch is coupled to the analog front-end and the second terminal of the third switch is coupled to the output terminal of the analog front end, wherein the third switch is switched synchronously with the second switch. 如請求項1所述的類比前端電路，其中還包括：一第三開關，包括一第一端及一第二端，其中所述第三開關 的所述第一端耦接至另一參考電壓且所述第三開關的所述第二端耦接至所述類比前端的所述輸出端，其中所述第三開關與所述第二開關同步地進行開關。 The analog front-end circuit according to claim 1, further comprising: a third switch, comprising a first end and a second end, wherein the third switch The first terminal of the first terminal is coupled to another reference voltage and the second terminal of the third switch is coupled to the output terminal of the analog front end, wherein the third switch and the second switch Switch on and off synchronously. 如請求項1所述的類比前端電路，其中所述參考電壓為一共模電壓或為一觸控驅動信號。 The analog front-end circuit of claim 1, wherein the reference voltage is a common mode voltage or a touch driving signal. 一種用於觸控控制器的類比前端電路的操作方法，其中所述類比前端電路包括一類比前端、一第一開關及一第二開關，所述類比前端的一輸入端耦接至所述第一開關的一第一端，所述第一開關的一第二端用以耦接至一面板佈線及所述第二開關的一第一端，所述第二開關的一第二端耦接至一參考電壓，且所述面板佈線還耦接至一觸控面板及一顯示面板，其中所述操作方法包括：在一第一週期期間導通所述第二開關；在所述第一週期期間，將來自所述顯示面板的一耦合雜訊信號經由所述面板佈線及所述第二開關傳送到所述參考電壓；在一第二週期期間導通所述第一開關；以及在所述第二週期期間，由所述類比前端的所述輸入端接收一觸控驅動信號，其中所述第一週期與所述第二週期未重疊，其中所述第一開關用以接收一第一開關信號，且所述第二開關用以接收一第二開關信號，其中所述第一開關信號及所述第二開關信號為一週期性方波，且所述第一開關信號與所述第二開關 信號為反相。 An operation method of an analog front-end circuit for a touch controller, wherein the analog front-end circuit comprises an analog front-end, a first switch and a second switch, and an input end of the analog front-end is coupled to the first switch A first end of a switch, a second end of the first switch is coupled to a panel wiring and a first end of the second switch, a second end of the second switch is coupled to to a reference voltage, and the panel wiring is further coupled to a touch panel and a display panel, wherein the operation method includes: turning on the second switch during a first period; during the first period , transmitting a coupled noise signal from the display panel to the reference voltage through the panel wiring and the second switch; turning on the first switch during a second period; and during the second period During a period, a touch driving signal is received by the input terminal of the analog front end, wherein the first period and the second period do not overlap, wherein the first switch is used for receiving a first switch signal, and the second switch is used for receiving a second switch signal, wherein the first switch signal and the second switch signal are a periodic square wave, and the first switch signal and the second switch The signal is inverted. 如請求項20所述的操作方法，其中所述觸控驅動信號的每一相鄰的一上升緣與一下降緣與所述顯示面板的一水平同步信號間隔一預定相位差而同步。 The operation method of claim 20, wherein each adjacent rising edge and a falling edge of the touch driving signal are synchronized with a horizontal synchronization signal of the display panel at a predetermined phase difference. 如請求項21所述的操作方法，其中所述第一開關信號的每一下降緣與所述水平同步信號的每一上升緣同步。 The method of operation of claim 21, wherein each falling edge of the first switch signal is synchronized with each rising edge of the horizontal synchronization signal. 如請求項20所述的操作方法，其中所述第一開關信號的每一上升緣與所述觸控驅動信號的每一上升緣及每一下降緣同步。 The operating method of claim 20, wherein each rising edge of the first switch signal is synchronized with each rising edge and each falling edge of the touch driving signal. 如請求項20所述的操作方法，其中所述第一開關信號的每一下降緣與所述顯示面板的所述耦合雜訊信號的每一上升緣及每一下降緣同步。 The operating method of claim 20, wherein each falling edge of the first switching signal is synchronized with each rising edge and each falling edge of the coupled noise signal of the display panel. 如請求項20所述的操作方法，其中所述顯示面板的一水平同步信號的一信號週期可與所述觸控驅動信號的一信號週期間隔一預定相位差而同步。 The operation method of claim 20, wherein a signal period of a horizontal synchronization signal of the display panel can be synchronized with a signal period of the touch driving signal at a predetermined phase difference. 如請求項20所述的操作方法，其中所述第一開關信號的每一下降緣與所述顯示面板的一多工器控制信號的每一上升緣及每一下降緣同步。 The operating method of claim 20, wherein each falling edge of the first switch signal is synchronized with each rising edge and each falling edge of a multiplexer control signal of the display panel. 如請求項20所述的操作方法，其中所述觸控驅動信號的一信號週期的N倍同步所述顯示面板的一發射信號的一信號週期，其中N為正整數。 The operation method of claim 20, wherein N times a signal period of the touch driving signal synchronizes a signal period of an emission signal of the display panel, wherein N is a positive integer. 如請求項27所述的操作方法，其中所述第一開關信號的每一第N下降緣與所述發射信號的每一下降緣及每一上升緣同步。 The method of operation of claim 27, wherein each Nth falling edge of the first switch signal is synchronized with each falling edge and each rising edge of the transmit signal. 如請求項20所述的操作方法，其中所述類比前端電路還包括一第三開關，且所述第三開關的一第一端耦接至所述類比前端的所述輸入端且所述第三開關的一第二端耦接至所述類比前端的所述輸出端，其中所述第三開關與所述第二開關同步地進行開關。 The operation method of claim 20, wherein the analog front-end circuit further comprises a third switch, and a first terminal of the third switch is coupled to the input terminal of the analog front-end and the first A second terminal of the three switches is coupled to the output terminal of the analog front end, wherein the third switch is switched synchronously with the second switch. 如請求項20所述的操作方法，其中所述參考電壓為一共模電壓或為所述觸控驅動信號。 The operation method of claim 20, wherein the reference voltage is a common mode voltage or the touch driving signal. 如請求項20所述的操作方法，其中由所述類比前端的所述輸入端接收所述觸控驅動信號的步驟包括：經由所述類比前端的所述輸入端在所述第二週期期間通過所述面板佈線及所述第一開關接收所述觸控面板的所述觸控驅動信號。 The operating method of claim 20, wherein the step of receiving the touch drive signal by the input terminal of the analog front end comprises: passing through the input terminal of the analog front end during the second period The panel wiring and the first switch receive the touch driving signal of the touch panel. 如請求項20所述的操作方法，其中所述類比前端的所述輸入端包括一第一輸入端以及一第二輸入端，並且由所述類比前端的所述輸入端接收所述觸控驅動信號的步驟包括：經由所述類比前端的所述第二輸入端在所述第二週期期間接收所述觸控驅動信號，並且經由所述類比前端的所述第一輸入端在所述第二週期期間通過所述面板佈線及所述第一開關發送所述觸控驅動信號至所述觸控面板。 The operation method according to claim 20, wherein the input terminal of the analog front end includes a first input terminal and a second input terminal, and the touch driving is received by the input terminal of the analog front end The step of signalling includes: receiving the touch drive signal during the second period via the second input terminal of the analog front end, and receiving the touch driving signal at the second input terminal via the first input terminal of the analog front end The touch driving signal is sent to the touch panel through the panel wiring and the first switch during a period.
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