CN101876872B - Image display system and touch panel control method - Google Patents

本发明涉及一种影像显示系统与触控面板控制方法，该影像显示系统包括一显示装置，显示装置包括电容式触控面板与电源供应，显示装置具有一共同电极，而触控面板包括感测电容器模块与取样电容器。感测电容器模块连接共同电极，且感测电容器模块的电容值为可变。取样电容器选择性地电连接感测电容器模块与共同电极。

The present invention relates to an image display system and a touch panel control method, wherein the image display system comprises a display device, the display device comprises a capacitive touch panel and a power supply, the display device has a common electrode, and the touch panel comprises a sensing capacitor module and a sampling capacitor. The sensing capacitor module is connected to the common electrode, and the capacitance value of the sensing capacitor module is variable. The sampling capacitor selectively electrically connects the sensing capacitor module and the common electrode.

影像显示系统与触控面板控制方法Image display system and touch panel control method

技术领域 technical field

本发明涉及一种影像显示系统，特别地，本发明的影像显示系统包括显示装置，其具有整合于其上的触控面板。The present invention relates to an image display system. In particular, the image display system of the present invention includes a display device with a touch panel integrated thereon.

背景技术 Background technique

已知技术中，鲜少将电容式触控面板直接设置在屏幕或是显示装置上，特别是用在薄型化显示装置上，例如液晶屏幕等。其原因在于，已知的电容式触控面板会有解析度不足的问题，换言之，若接触面积过小的物体，例如触控笔的笔尖，电容式触控面板可能无法判别。In the prior art, the capacitive touch panel is seldom directly arranged on the screen or the display device, especially for thin display devices, such as liquid crystal screens. The reason is that the known capacitive touch panel has a problem of insufficient resolution. In other words, if the contact area is too small, such as the tip of a stylus, the capacitive touch panel may not be able to distinguish.

此外，将电容式触控面板设置在薄型化显示装置上时，在触控面板与显示装置之间会产生寄生电容与杂讯，且存有因频率限制而导致无法使用线对线(line-by-line)扫描的问题。In addition, when a capacitive touch panel is placed on a thinner display device, parasitic capacitance and noise will be generated between the touch panel and the display device, and there is a problem that line-to-line (line-to-line) cannot be used due to frequency limitations. by-line) scanning problem.

发明内容 Contents of the invention

本发明的一个目的在于提供一种影像显示系统，该系统包括显示装置，且显示装置具有整合于其上的触控面板。而本发明的另一个目的在于处理影像显示系统中触控面板与显示装置之间的寄生电容与杂讯的问题。An object of the present invention is to provide an image display system, the system includes a display device, and the display device has a touch panel integrated thereon. Another object of the present invention is to solve the problem of parasitic capacitance and noise between the touch panel and the display device in the image display system.

在一个实施例中，影像显示系统包括一显示装置，显示装置则包括电容式触控面板与电源供应，显示装置具有一共同电极，而触控面板包括感测电容器模块与取样电容器。感测电容器模块连接共同电极，且感测电容器模块的电容值为可变。取样电容器选择性地电连接感测电容器模块与共同电极。In one embodiment, the image display system includes a display device, the display device includes a capacitive touch panel and a power supply, the display device has a common electrode, and the touch panel includes a sensing capacitor module and a sampling capacitor. The sensing capacitor module is connected to the common electrode, and the capacitance value of the sensing capacitor module is variable. The sampling capacitor selectively electrically connects the sensing capacitor module and the common electrode.

在另一个实施例中，触控面板控制方法可应用于上述的影像显示系统，此方法包括：对感测电容器模块进行充电；对感测电容器模块进行放电；以及当感测电容器模块放电时，将取样电容器电连接感测电容器模块与共同电极。In another embodiment, the touch panel control method can be applied to the above-mentioned image display system, and the method includes: charging the sensing capacitor module; discharging the sensing capacitor module; and when the sensing capacitor module is discharged, The sampling capacitor is electrically connected to the sensing capacitor module and the common electrode.

在一个实施例中，影像显示系统包括显示装置，显示装置则包括电容式触控面板与电源供应，显示装置具有共同电极，而触控面板包括电容器组与取样电容器。电容器组包括第一感测电容器模块与第二感测电容器模块，而第一与第二感测电容器模块分别连接共同电极，且第一与第二感测电容器模块的电容值皆为可变。取样电容器选择性地电连接感测电容器组与共同电极。In one embodiment, the image display system includes a display device, the display device includes a capacitive touch panel and a power supply, the display device has a common electrode, and the touch panel includes a capacitor bank and a sampling capacitor. The capacitor bank includes a first sensing capacitor module and a second sensing capacitor module, and the first and second sensing capacitor modules are respectively connected to common electrodes, and the capacitance values of the first and second sensing capacitor modules are variable. The sampling capacitor electrically connects the sensing capacitor bank and the common electrode selectively.

附图说明 Description of drawings

图1示出了根据本发明实施例的显示系统；Fig. 1 shows a display system according to an embodiment of the present invention;

图2a示出了根据本发明实施例的触控面板电路；Figure 2a shows a touch panel circuit according to an embodiment of the present invention;

图2b说明了根据本发明实施例的触控面板的感测电容器与寄生电容器的特性；FIG. 2b illustrates characteristics of sensing capacitors and parasitic capacitors of a touch panel according to an embodiment of the present invention;

图2c说明了根据本发明实施例的杂讯抑制电路的运作；Figure 2c illustrates the operation of the noise suppression circuit according to an embodiment of the present invention;

图2d示出了根据本发明实施例的比较电路；以及Figure 2d shows a comparison circuit according to an embodiment of the present invention; and

图2e示出了根据本发明实施例中的触控面板的操作时序图。Fig. 2e shows an operation sequence diagram of the touch panel according to the embodiment of the present invention.

主要元件标号说明Description of main components

显示系统1        电子装置10Display system 1 Electronic device 10

显示装置100      电容式触控面板200Display device 100 Capacitive touch panel 200

电容器组202      电容器模块2022Capacitor bank 202 Capacitor module 2022

处理电路208      充放电电路2082Processing circuit 208 Charge and discharge circuit 2082

杂讯抑制电路2084 比较电路2086Noise suppression circuit 2084 Comparison circuit 2086

感测电容器Cs      寄生电容器CpSensing Capacitor Cs Parasitic Capacitor Cp

取样电容器CcSampling capacitor Cc

开关SW1、SW1′、SW2、SW2′Switches SW1, SW1', SW2, SW2'

具体实施方式 Detailed ways

根据本发明，其提供了一种应用于影像显示系统的显示装置上的电容式触控面板。为了使本发明的叙述更加详尽与完备，可参照下列描述并结合图1至图2e。According to the present invention, it provides a capacitive touch panel applied to a display device of an image display system. In order to make the description of the present invention more detailed and complete, reference may be made to the following description in conjunction with FIGS. 1 to 2e.

参考图1，其为根据本发明一个实施例的显示系统1，包括具有显示装置100(例如液晶显示装置或是OLED显示装置)的电子装置10，特别是电容式触控面板200装设于显示装置100上，显示装置100还包括一电源供应(图未示)供触控面板200运作，而使用者可通过电容式触控面板200观看到显示装置100所提供的影像。Referring to FIG. 1 , it is a display system 1 according to an embodiment of the present invention, including an electronic device 10 having a display device 100 (such as a liquid crystal display device or an OLED display device), especially a capacitive touch panel 200 mounted on the display On the device 100 , the display device 100 also includes a power supply (not shown) for the operation of the touch panel 200 , and the user can watch the image provided by the display device 100 through the capacitive touch panel 200 .

于本实施例中，具有显示装置100的电子装置10可实施为移动电话、数码相机、个人数字助理(PDA)、笔记型电脑、桌上型电脑、电视、车用显示器、航空用显示器、全球定位系统(GPS)或可携式数字影音光碟(DVD)播放器。In this embodiment, the electronic device 10 with the display device 100 can be implemented as a mobile phone, a digital camera, a personal digital assistant (PDA), a notebook computer, a desktop computer, a television, a vehicle display, an aviation display, a global Positioning system (GPS) or portable digital video disc (DVD) player.

图2a示出了根据本发明一个实施例的电容式触控面板200的电路。于本实施例中，电容式触控面板200包括多个电容器组202与处理电路208。其中，每一电容器组202还包括多个感测电容器模块2022，且每一个电容器模块2022分别包括一感测电容器Cs，而感测电容器Cs的电极可实施为透明电极，其材料可为铟锡氧化物(Indium Tin Oxide，简称ITO)，宽度介于0.1mm～0.5mm，而透明电极除了长条形状外，亦可为任意形状。当电容器模块2022被例如手指或触控笔触碰时，感测电容器Cs中的电容值产生变化。此部分为本领域的技术人员所熟知，不再赘述。Fig. 2a shows a circuit of a capacitive touch panel 200 according to an embodiment of the present invention. In this embodiment, the capacitive touch panel 200 includes a plurality of capacitor banks 202 and a processing circuit 208 . Wherein, each capacitor bank 202 also includes a plurality of sensing capacitor modules 2022, and each capacitor module 2022 includes a sensing capacitor Cs, and the electrode of the sensing capacitor Cs can be implemented as a transparent electrode, and its material can be indium tin Indium Tin Oxide (ITO for short), the width is between 0.1mm and 0.5mm, and the transparent electrode can be in any shape besides the elongated shape. When the capacitor module 2022 is touched by a finger or a stylus, the capacitance of the sensing capacitor Cs changes. This part is well known to those skilled in the art and will not be repeated here.

但须注意的是，电容器模块2022的电极与显示装置100的共同电极PV或者邻近电容器模块2022的电极间存在有寄生电容器Cp，而寄生电容器Cp是在触控面板200制作及设置于显示装置100时产生的，其中，寄生电容器Cp的电容值大约是固定的。图2b是根据电容器模块2022被待测物体接触到的面积所造成的电容值变化的关系示意图，其中，X轴表示电容值，Y轴表示电容器模块2022被接触的面积。随着电容器模块2022被接触到的面积的增加，其感测电容器Cs的电容值亦随之增加，而可储存的电量也随之改变。However, it should be noted that there is a parasitic capacitor Cp between the electrode of the capacitor module 2022 and the common electrode PV of the display device 100 or an electrode adjacent to the capacitor module 2022, and the parasitic capacitor Cp is fabricated on the touch panel 200 and arranged on the display device 100. , where the capacitance of the parasitic capacitor Cp is approximately constant. Fig. 2b is a schematic diagram showing the relationship between capacitance changes caused by the contact area of the capacitor module 2022 by the object to be measured, wherein the X-axis represents the capacitance value, and the Y-axis represents the contact area of the capacitor module 2022. As the contacted area of the capacitor module 2022 increases, the capacitance of the sensing capacitor Cs increases accordingly, and the stored electricity also changes accordingly.

处理电路208还包括充放电电路2082、杂讯抑制电路2084、与比较电路2086。根据触控面板200中扫描电路(图未示)的不同的运作方式，充放电电路2082可对单一电容器模块2022进行充电与放电，或是依序或同时对多个电容器模块2022进行充电与放电。值得一提的是，前述的寄生电容器Cp亦会对电容器模块2022造成影响，但如图2b所示，寄生电容器Cp的电容值大约是定值，不会随着电容器模块2022是否有被触碰而改变。The processing circuit 208 further includes a charge and discharge circuit 2082 , a noise suppression circuit 2084 , and a comparison circuit 2086 . According to different operation modes of the scanning circuit (not shown) in the touch panel 200, the charging and discharging circuit 2082 can charge and discharge a single capacitor module 2022, or charge and discharge multiple capacitor modules 2022 sequentially or simultaneously . It is worth mentioning that the aforementioned parasitic capacitor Cp will also affect the capacitor module 2022. However, as shown in FIG. And change.

充放电电路2082将提供一固定充电电压V，用以对电容器模块2022进行充电，以及提供电流I对单一电容器模块2022或是电容器组202中多个电容器模块2022依序或同时进行放电，而当处理电路208与电容器模块2022导通时，可于节点A测量到单一电容器模块2022或是电容器组202中多个电容器模块2022的等效电压，而当电容器模块2022被待测物体触碰时，感测电容器Cs的电容值的变化将影响节点A的等效电压VA。The charging and discharging circuit 2082 will provide a fixed charging voltage V for charging the capacitor module 2022, and provide a current I to discharge a single capacitor module 2022 or multiple capacitor modules 2022 in the capacitor bank 202 sequentially or simultaneously, and when When the processing circuit 208 is connected to the capacitor module 2022, the equivalent voltage of a single capacitor module 2022 or multiple capacitor modules 2022 in the capacitor bank 202 can be measured at node A, and when the capacitor module 2022 is touched by the object to be measured, The change of the capacitance value of the sensing capacitor Cs will affect the equivalent voltage VA of the node A.

杂讯抑制电路2084包括取样电容器Cc，当电容器模块2022与充放电电路2082导通而放电时，取样电容器Cc用来储存电容器模块2022所流出的电量，并借此测量电容器模块2022的电容值或是电容值变化；或是在其它实施例中，当电容器组202中多个电容器模块2022与充放电电路2082依序或是同时导通而放电时，取样电容器Cc用来储存单一或多个电容器模块2022所流出的电量，并借此测量单一或是多个电容器模块2022的电容值或是电容值变化。The noise suppression circuit 2084 includes a sampling capacitor Cc. When the capacitor module 2022 is connected to the charge-discharge circuit 2082 to discharge, the sampling capacitor Cc is used to store the electricity flowing out of the capacitor module 2022, and thereby measure the capacitance value of the capacitor module 2022 or or in other embodiments, when multiple capacitor modules 2022 in the capacitor bank 202 and the charging and discharging circuit 2082 are sequentially or simultaneously turned on and discharged, the sampling capacitor Cc is used to store single or multiple capacitors The electric quantity flowing out of the module 2022 is used to measure the capacitance value or capacitance value change of a single or multiple capacitor modules 2022 .

如前所述，电容器模块2022不可避免地会含有寄生电容器Cp，而寄生电容器Cp是相对于显示装置100的共同电极PV所形成的，而当共同电极PV带有杂讯时，将会使得电容器模块2022与取样电容器Cc储存的电量都受到杂讯的影响，而无法准确地测量电容器模块2022的电容值。因此，在本实施例中，取样电容器Cc的一端与一或多个电容器模块2022连接，取样电容器Cc的另一端则与显示装置100的共同电极PV连接。如图所示，取样电容器Cc两端同时都会受到共同电极PV的影响而互相抵销，因此当等效电压VA受到共同电极PV杂讯的影响时，取样电容器Cc还是能够正确地测量到电容器模块2022所流出的电量。As mentioned above, the capacitor module 2022 will inevitably contain a parasitic capacitor Cp, and the parasitic capacitor Cp is formed relative to the common electrode PV of the display device 100, and when the common electrode PV has noise, it will make the capacitor Both the power stored in the module 2022 and the sampling capacitor Cc are affected by noise, so the capacitance value of the capacitor module 2022 cannot be accurately measured. Therefore, in this embodiment, one end of the sampling capacitor Cc is connected to one or more capacitor modules 2022 , and the other end of the sampling capacitor Cc is connected to the common electrode PV of the display device 100 . As shown in the figure, both ends of the sampling capacitor Cc are affected by the common electrode PV and cancel each other out. Therefore, when the equivalent voltage VA is affected by the noise of the common electrode PV, the sampling capacitor Cc can still correctly measure the capacitor module. 2022 outflow of electricity.

图2c示出了根据本发明一个实施例的杂讯抑制电路2084。杂讯抑制电路2084包括一取样电容器Cc、第一组开关SW1与SW1′、与第二组开关SW2与SW2′。第一组开关SW1与SW1′同步运作，其中，开关SW1设置在取样电容器Cc与电容器模块2022之间，而开关SW1′设置在取样电容器Cc与共同电极PV之间。第二组开关SW2与SW2′同步运作，其中，开关SW2设置在取样电容器Cc与接地之间，而开关SW2′设置在取样电容器Cc与比较电路2086之间。此外，第一组开关SW1与SW1′与第二组开关SW2与SW2′反相运作。FIG. 2c shows a noise suppression circuit 2084 according to one embodiment of the present invention. The noise suppression circuit 2084 includes a sampling capacitor Cc, a first set of switches SW1 and SW1', and a second set of switches SW2 and SW2'. The first group of switches SW1 and SW1 ′ operate synchronously, wherein the switch SW1 is disposed between the sampling capacitor Cc and the capacitor module 2022 , and the switch SW1 ′ is disposed between the sampling capacitor Cc and the common electrode PV. The second set of switches SW2 and SW2 ′ operate synchronously, wherein the switch SW2 is set between the sampling capacitor Cc and ground, and the switch SW2 ′ is set between the sampling capacitor Cc and the comparison circuit 2086 . In addition, the first set of switches SW1 and SW1' and the second set of switches SW2 and SW2' operate in antiphase.

优选地，第一组开关SW1与SW1′应依据来自显示装置100的第一时脉信号CLK1而开启或关闭，而第二组开关SW2与SW2′应依据来自显示装置100的第二时脉信号CLK2而开启或关闭。此实施例中，第一组开关SW1与SW1′与第二组开关SW2与SW2′可实施为相同n型或是p型的电晶体，而第一时脉信号CLK1与第二时脉信号CLK2可为反相的时脉信号，而如果第一组开关SW1与SW1′与第二组开关SW2与SW2′实施为相反n型或是p型的电晶体，则第一时脉信号CLK1与第二时脉信号CLK2为同相的时脉信号。Preferably, the first set of switches SW1 and SW1' should be turned on or off according to the first clock signal CLK1 from the display device 100, and the second set of switches SW2 and SW2' should be turned on or off according to the second clock signal from the display device 100 CLK2 is turned on or off. In this embodiment, the first group of switches SW1 and SW1' and the second group of switches SW2 and SW2' can be implemented as the same n-type or p-type transistors, and the first clock signal CLK1 and the second clock signal CLK2 It can be an inverted clock signal, and if the first group of switches SW1 and SW1' and the second group of switches SW2 and SW2' are implemented as opposite n-type or p-type transistors, the first clock signal CLK1 and the second The two clock signals CLK2 are in-phase clock signals.

以下进一步说明杂讯抑制电路2084的运作。在图2c的实施例中，第一组开关SW1与SW1′与第二组开关SW2与SW2′皆实施为n型电晶体，而第一时脉信号CLK1与第二时脉信号CLK2为反相的时脉信号。首先，在第一阶段，如图2c左侧所示，第一组开关SW1与SW1′为开启，第二组开关SW2与SW2′为关闭，此时取样电容器Cc电连接电容器模块2022与共同电极PV，接收电容器模块2022放电所流出的电量，且因取样电容器Cc一端与共同电极PV连接，因此如先前所述，即使节点A的等效电压VA会因放电的电容器模块2022受到共同电极PV所带有的杂讯所影响，此杂讯会同时出现在取样电容器Cc的两端而互相抵销，而不会影响取样电容器Cc所接收的电量，因此取样电容器Cc所形成的电压Vs可正确地反应电容器模块2022的电容值。The operation of the noise suppression circuit 2084 is further described below. In the embodiment of FIG. 2c, the first group of switches SW1 and SW1' and the second group of switches SW2 and SW2' are implemented as n-type transistors, and the first clock signal CLK1 and the second clock signal CLK2 are inverse phases. the clock signal. First, in the first stage, as shown on the left side of FIG. 2c, the first set of switches SW1 and SW1' are turned on, and the second set of switches SW2 and SW2' are turned off. At this time, the sampling capacitor Cc is electrically connected to the capacitor module 2022 and the common electrode PV, receives the electricity flowing out from the discharge of the capacitor module 2022, and because one end of the sampling capacitor Cc is connected to the common electrode PV, as previously mentioned, even the equivalent voltage VA of node A will be affected by the discharged capacitor module 2022 by the common electrode PV. Affected by the noise, the noise will appear at the two ends of the sampling capacitor Cc at the same time to cancel each other, and will not affect the power received by the sampling capacitor Cc, so the voltage Vs formed by the sampling capacitor Cc can be correctly The capacitance value of the reaction capacitor module 2022 .

而在下一阶段，如图2c右侧所示，当第一组开关SW1与SW1′为关闭时，第二组开关SW2与SW2′为开启，此时取样电容器Cc电连接比较电路2086与接地，且在前一阶段中取样电容器Cc所储存的电压Vs将会由比较电路2086从节点B所接收，并进一步比较此电压Vs以及一参考电压Vref，而产生输出信号Vc。关于此部分，将随后结合图2d加以说明。And in the next stage, as shown on the right side of FIG. 2c, when the first set of switches SW1 and SW1' are closed, the second set of switches SW2 and SW2' are turned on. At this time, the sampling capacitor Cc is electrically connected to the comparison circuit 2086 and the ground. And in the previous stage, the voltage Vs stored in the sampling capacitor Cc will be received by the comparison circuit 2086 from the node B, and the voltage Vs will be further compared with a reference voltage Vref to generate the output signal Vc. Regarding this part, it will be described later in conjunction with FIG. 2d.

如图2d所示，比较电路2086可包括运算放大器OP AMP与积分电容器Cf，用以比较电压Vs与参考电压Vref，而根据电压Vs与参考电压Vref的比较结果，产生输出信号Vc给后续的处理电路(未示)。比较单元2086还包括低通滤波器LPF，用以滤除伴随参考电压Vref于传输过程中所产生的杂讯。优选地，当电压Vs小于参考电压Vref时，则比较电路2086产生输出信号Vc，以指示电容器模块2022的电容值改变，代表电容器模块2022受到使用者的有意地接触。值得一提的是，如先前所述，根据不同的扫描方式，取样电容器Cc可用来储存单一或多个电容器模块2022所流出的电量，相对地取样电容器Cc所预计要形成的电压Vs可能也有所差异。对于“储存单一电容器模块2022所流出的电量”或是“储存一电容器组202中多个电容器模块2022所流出的电量”的不同需求，可根据相应的电容器模块2022的数目，采用不同的取样电容器Cc、不同的比较电路2086，或是采用不同的参考电压Vref。As shown in Figure 2d, the comparison circuit 2086 may include an operational amplifier OP AMP and an integrating capacitor Cf for comparing the voltage Vs with the reference voltage Vref, and according to the comparison result of the voltage Vs and the reference voltage Vref, an output signal Vc is generated for subsequent processing circuit (not shown). The comparison unit 2086 also includes a low-pass filter LPF for filtering out noise generated during the transmission of the reference voltage Vref. Preferably, when the voltage Vs is less than the reference voltage Vref, the comparing circuit 2086 generates an output signal Vc to indicate that the capacitance of the capacitor module 2022 changes, which means that the capacitor module 2022 is touched intentionally by the user. It is worth mentioning that, as mentioned earlier, according to different scanning methods, the sampling capacitor Cc can be used to store the electricity flowing out of a single or multiple capacitor modules 2022, and the voltage Vs expected to be formed by the sampling capacitor Cc may also vary. difference. Different sampling capacitors can be used according to the number of corresponding capacitor modules 2022 for different requirements of "storing the electricity flowing out of a single capacitor module 2022" or "storing the electricity flowing out of a plurality of capacitor modules 2022 in a capacitor bank 202". Cc, different comparison circuits 2086, or different reference voltages Vref.

图2e为根据本发明实施例中的触控面板的操作时序图，并结合图2a与图2c说明本发明，且假设没有共同电压PV的杂讯产生。以单一电容器模块2022而言，首先，充放电电路2082提供充电电压V对电容器模块2022充电，接着充放电电路2082再对电容器模块2022进行放电，而在节点A具有等效电压VA。在此充放电阶段，第一时脉信号CLK1开启第一组开关SW1与SW1′，而第二时脉信号CLK2关闭第二组开关SW2与SW2′，使得取样电容器Cc以等效电压VA而进行充电，而具有取样电压Vs。而在电容器模块2022放电以及取样电容器Cc充电结束后，第一时脉信号CLK1关闭第一组开关SW1与SW1′，而第二时脉信号CLK2开启第二组开关SW2与SW2′，使得比较电路2086接收取样电压Vs且比较取样电压Vs以及参考电压Vref，并根据取样电压Vs以及参考电压Vref的比较结果产生输出信号Vc。如先前所述，当待测物体未碰触触控面板200时，电容器模块2022仅存有寄生电容Cp；当待测物体碰触触控面板200时，电容器模块2022存有并联的寄生电容Cp与感测电容Cs，故总电容值会增加(如图2b中所示)。在一个实施例中，充放电电路2082提供固定的电流，且其放电时间亦固定，因此从电容器模块2022流出的电量相对为固定，因此当电容器模块2022的电容值增加时，取样电压Vs会降低，如图2e中所示。当取样电压Vs低于预设的参考电压Vref，比较电路2086输出一低电压作为输出信号Vc。反之，若电容器模块2022没有受到使用者接触，其电容值没有改变，相应地取样电容器的取样电压Vs也没有增加，而高于预设的参考电压Vref，因此比较电路2086输出一高电压作为输出信号Vc。而后续的处理电路(未示)可再根据输出信号Vc的电压判断使用者是否有意的接触触控屏幕200，而决定是否产生一输入指令。FIG. 2e is an operation timing diagram of the touch panel according to an embodiment of the present invention, and the present invention is described in combination with FIG. 2a and FIG. 2c, and it is assumed that there is no noise generated by the common voltage PV. For a single capacitor module 2022, firstly, the charging and discharging circuit 2082 provides a charging voltage V to charge the capacitor module 2022, and then the charging and discharging circuit 2082 discharges the capacitor module 2022, and the node A has an equivalent voltage VA. In this charging and discharging phase, the first clock signal CLK1 turns on the first set of switches SW1 and SW1', and the second clock signal CLK2 turns off the second set of switches SW2 and SW2', so that the sampling capacitor Cc is charged at the equivalent voltage VA. Charging, while having a sampling voltage Vs. After the capacitor module 2022 is discharged and the sampling capacitor Cc is charged, the first clock signal CLK1 turns off the first group of switches SW1 and SW1', and the second clock signal CLK2 turns on the second group of switches SW2 and SW2', so that the comparison circuit The 2086 receives the sampling voltage Vs and compares the sampling voltage Vs and the reference voltage Vref, and generates an output signal Vc according to the comparison result of the sampling voltage Vs and the reference voltage Vref. As previously mentioned, when the object to be measured does not touch the touch panel 200, the capacitor module 2022 only has a parasitic capacitance Cp; when the object to be measured touches the touch panel 200, the capacitor module 2022 has a parallel parasitic capacitance Cp and the sensing capacitor Cs, so the total capacitance will increase (as shown in Figure 2b). In one embodiment, the charge and discharge circuit 2082 provides a fixed current, and its discharge time is also fixed, so the electricity flowing out from the capacitor module 2022 is relatively constant, so when the capacitance value of the capacitor module 2022 increases, the sampling voltage Vs will decrease , as shown in Figure 2e. When the sampling voltage Vs is lower than the preset reference voltage Vref, the comparing circuit 2086 outputs a low voltage as the output signal Vc. On the contrary, if the capacitor module 2022 is not touched by the user, its capacitance value does not change, correspondingly the sampling voltage Vs of the sampling capacitor does not increase, but is higher than the preset reference voltage Vref, so the comparison circuit 2086 outputs a high voltage as an output Signal Vc. A subsequent processing circuit (not shown) can judge whether the user touches the touch screen 200 intentionally according to the voltage of the output signal Vc, and then determine whether to generate an input command.

以上说明虽然以单一电容器模块2022加以说明，但亦可应用于一电容器组202中多个电容器模块2022。若此电容器组202中多个电容器模块2022一同进行放电，则后续第一组开关SW1与SW1′、第二组开关SW2与SW2′、以及比较电路2086的运作皆与前述相同，仅需注意可能需要采用不同的取样电容器Cc以及不同的参考电压Vref。若此电容器组202中多个电容器模块2022依序进行放电，则后续第一组开关SW1与SW1′、第二组开关SW2与SW2′、以及比较电路2086的运作对应每一电容器模块2022依序进行，不再赘述。Although the above description is described with a single capacitor module 2022 , it can also be applied to multiple capacitor modules 2022 in a capacitor bank 202 . If a plurality of capacitor modules 2022 in the capacitor bank 202 are discharged together, the operations of the subsequent first set of switches SW1 and SW1', the second set of switches SW2 and SW2', and the comparison circuit 2086 are the same as those described above. Different sampling capacitors Cc and different reference voltages Vref need to be used. If a plurality of capacitor modules 2022 in the capacitor bank 202 are discharged sequentially, then the subsequent operation of the first group of switches SW1 and SW1', the second group of switches SW2 and SW2', and the comparison circuit 2086 corresponds to each capacitor module 2022 in sequence Go ahead, no more details.

根据以上的设置，本发明实施例提供了一种整合在显示装置上的电容式触控面板，其具有相对于电阻式触控面板的优点，例如，根据本发明的实施例不会增加显示装置的厚度，也解决了寄生电容与杂讯干扰的问题，而且，可应用在以单一电容器模块所进行的感测，或是多个电容器模块依序或一同的感测方式中。According to the above settings, the embodiment of the present invention provides a capacitive touch panel integrated on the display device, which has advantages over the resistive touch panel, for example, the embodiment of the present invention does not increase the The thickness also solves the problems of parasitic capacitance and noise interference, and can be applied to the sensing with a single capacitor module, or the sequential or joint sensing of multiple capacitor modules.

以上所述仅为本发明的优选实施例而已，并非用以限定本发明的申请专利范围；凡其它未脱离本发明所揭示的精神下所完成的等效改变或修饰，均应包含在前述申请专利范围内。The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention; all other equivalent changes or modifications that do not deviate from the spirit disclosed in the present invention should be included in the foregoing application within the scope of the patent.