Touch display driving circuit and operation method thereof

Abstract

A touch control display driving circuit and an operation method thereof are suitable for driving at least one sensing electrode of a touch control display panel, and the touch control display driving circuit comprises a source electrode driver and an analog front end circuit electrically coupled to the sensing electrode of the touch control display panel. The source driver is electrically coupled to a first operating voltage and a second operating voltage, the analog front-end circuit is electrically coupled to a third operating voltage and a fourth operating voltage, and the first operating voltage, the second operating voltage, the third operating voltage and the fourth operating voltage are different operating voltages. By adopting the technical scheme disclosed by the invention, the power loss can be effectively reduced, redundant power waste is avoided, and the power efficiency of the power supply is optimized.

Description

Technical Field

[0001] The present invention relates to a touch display driving technology, and more particularly to a touch display driving circuit and an operating method thereof that can optimize power consumption and power saving performance. Background Art

[0002] As is known to all, in recent years, a driver combining touch and display functions, such as the well-known touch panel sensing chip, has successfully become an emerging technology in recent years. This touch screen sensing chip mainly integrates the panel driver chip and the touch chip into a single chip. Generally speaking, compared with traditional discrete technologies, including discrete touch, single layer on cell (SLOC), and embedded in cell, this driver circuit combining touch and display functions has the advantage of lower structural complexity and does not require the use of known thin films and adhesive layers. Materials, such as materials, make the touch display driver circuit more competitive and more promising from the perspective of manufacturing cost and production yield.

[0003] On the other hand, from the perspective of circuit designers or their suppliers, the architecture of the driver circuit combined with touch display also helps to simplify its circuit design and shorten its product development cycle. From the perspective of end users, since the supply chain structure of the production product is simplified, the adoption and purchasing behavior of end users is more convenient than in the past. However, it is worth noting that the power consumption of such a driver circuit combined with touch display may still be a problem to be solved. As is well known to those skilled in the art, the average power consumption of a touch display screen mainly includes: the working time of the controller (including scanning, processing, communication, sleep and other modes), and the time spent by its main operator to receive and translate input touch data. In view of this, it is obvious that for a touch display panel (screen), its power consumption is one of the very important performance parameters for evaluating whether the touch display panel is good. In addition, different operating modes usually result in different power consumption. In order to effectively calculate the overall power consumption of a touch display panel, it is usually necessary to use a very accurate and complex calculation formula.

[0004] For example, in the case of an analog circuit that combines touch and display functions, its source driver is usually divided into positive polarity (to make it operate at a positive power supply voltage) and negative polarity (to make it operate at a negative power supply voltage). This requires the touch circuit electrically coupled to it to switch between different operating voltages when the panel performs sensing and display. Such switching steps not only consume unnecessary operating time, but also increase power consumption. In view of this, traditional touch display panels usually have the problem of excessive power consumption, and there is an urgent need for improvement by those skilled in the art. In order to ensure that the touch display panel does not generate excessive power consumption, several methods have been disclosed in the prior art, but the results are still not significant. Therefore, how to further reduce power consumption has become one of the research focuses that needs to be developed in recent years.

[0005] Therefore, in view of the above, it is obvious that the technical personnel in this field do have an urgent need to develop a driving circuit and an operating method thereof that are both novel and creative and can be used to drive a touch display panel, so as to solve the problems existing in the above-mentioned prior art through this technical solution, so that the overall power consumption of the touch display panel can be further optimized. Summary of the invention

[0006] In order to solve the above-mentioned deficiencies, one object of the present invention is to provide an innovative touch display driving circuit suitable for driving at least one sensing electrode of a touch display panel.

[0007] Another object of the present invention is to provide an operating method of a touch display driving circuit suitable for driving at least one sensing electrode of a touch display panel. By adopting the touch display driving circuit and the operating method thereof disclosed in the present invention, when the driven touch display panel executes the display and sensing modes, the switching time between different operating modes of the sensing circuit (i.e., the analog front-end circuit disclosed in the present invention) can be greatly reduced, thereby optimizing the overall power consumption of the touch display panel to which the present invention is applied. In other words, when the technical solution disclosed in the present invention is adopted, redundant power waste can also be avoided and eliminated.

[0008] According to the technology disclosed in the embodiment of the present invention, a touch display driving circuit is disclosed. This touch display driving circuit is suitable for driving at least one sensing electrode (sensing pad) of a touch display panel. The touch display driving circuit includes: a source driver, which is electrically coupled to a first operating voltage and a second operating voltage; and an analog front-end circuit, which is electrically coupled to the sensing electrode of the touch display panel, and the analog front-end circuit is used to drive at least one sensing electrode of the touch display panel.

[0009] In an embodiment of the present invention, the analog front-end circuit is a touch sensing circuit, which can be used to sense an input contact signal (touch input) to drive the sensing electrode of the touch display panel electrically connected thereto. The analog front-end circuit is electrically coupled to a third operating voltage and a fourth operating voltage, and the first operating voltage and the second operating voltage of the source driver are different from the third operating voltage and the fourth operating voltage of the analog front-end circuit.

[0010] Furthermore, the third operating voltage of the analog front end circuit is greater than a common mode electrode voltage (VCOM) of the at least one sensing electrode, and the fourth operating voltage of the analog front end circuit is less than the common mode electrode voltage (VCOM) of the at least one sensing electrode.

[0011] Preferably, when the third operating voltage of the analog front-end circuit is defined as "VTSP" and the fourth operating voltage is defined as "VTSN", the analog front-end circuit has an operable voltage drop, and the maximum value of the operable voltage drop is "VACS", so that (VTSP-VTSN) <VACS。

[0012] On the other hand, the source driver disclosed in the present invention includes a first source drive operational amplifier and a second source drive operational amplifier, wherein the first and second source drive operational amplifiers are connected in series, and the first source drive operational amplifier is electrically coupled between the first operating voltage and a ground voltage, and the second source drive operational amplifier is electrically coupled between the second operating voltage and the ground voltage, so that the first source drive operational amplifier disclosed in the present invention is a positive polarity operational amplifier operating in a positive voltage domain, and the second source drive operational amplifier is a negative polarity operational amplifier operating in a negative voltage domain.

[0013] According to the embodiment of the present invention, the first source driver operational amplifier, the second source driver operational amplifier, and the analog front-end circuit can all be circuits made by using middle-voltage (MV) components.

[0014] Therefore, when the technical solution disclosed in the present invention is adopted, when the touch display panel is used for display, at least one sensing electrode of the touch display panel is electrically coupled to the common-mode electrode voltage. When the touch display panel is used for sensing an input contact signal, at least one sensing electrode of the touch display panel is electrically coupled to a sensing voltage, and the sensing voltage is less than the third operating voltage of the analog front-end circuit, and greater than the fourth operating voltage of the analog front-end circuit.

[0015] In addition, according to an embodiment of the present invention, the touch display driving circuit may further include at least one adjustment circuit, so that the analog front-end circuit is electrically coupled to the at least one adjustment circuit, so that the third operating voltage or the fourth operating voltage of the analog front-end circuit is generated through the first operating voltage or the second operating voltage of the source driver.

[0016] Alternatively, in another embodiment, the third operating voltage or the fourth operating voltage of the analog front-end circuit can also be selectively a power supply voltage or generated by an external power chip. In general, a person with ordinary knowledge in the technical field can naturally make appropriate conversions and modifications according to actual circuit design requirements when necessary.

[0017] On the other hand, the present invention further provides an operating method suitable for the touch display driving circuit, and drives at least one sensing electrode of a touch display panel by the operating method. However, the application of the present invention is not limited to this, and the operating method provided by the present invention can also be applied to other existing known touch display panel driving circuit architectures. Once the disclosure of this application is known, other alternative and modified illustrative examples will be obvious to those skilled in the art.

[0018] In one embodiment, the operating method can be applied to a touch display driving circuit composed of a source driver and an analog front-end circuit electrically coupled to the at least one sensing electrode. The operating method includes: providing a first operating voltage and a second operating voltage to the source driver; and providing a third operating voltage and a fourth operating voltage to the analog front-end circuit, wherein the first operating voltage and the second operating voltage of the source driver are different from the third operating voltage and the fourth operating voltage of the analog front-end circuit.

[0019] By adopting the operating method disclosed in the present invention, when the driven touch display panel is used for display, at least one sensing electrode of the touch display panel is electrically coupled to a common mode electrode voltage. When the touch display panel is used for sensing an input contact signal, at least one sensing electrode of the touch display panel is electrically coupled to a sensing voltage, and the sensing voltage is between the third operating voltage and the fourth operating voltage of the analog front-end circuit.

[0020] In view of this, it is obvious that when the touch display driving circuit and its operation method disclosed in the present invention are adopted, when the touch display panel switches between the display and sensing modes, the voltage change switching is greatly reduced compared with the prior art, thereby greatly reducing the power consumption. That is to say, the present invention can effectively solve the problem of excessive power consumption in the prior art, not only can successfully reduce the power consumption of the power supply, but also avoid redundant power waste. The present invention not only eliminates many deficiencies existing in the prior art in the existing field, making the present application highly competitive, but also can be effectively and widely applied in related industries.

[0021] In summary, it has been verified that the present invention discloses a precisely designed driving technology with innovation and novelty, which can be widely applied to the touch and display driving circuit architecture and successfully reduces the chip power consumption to the lowest level. Therefore, compared with the prior art, the present invention can effectively eliminate redundant power consumption. It should be understood that the foregoing technical abstract and the following detailed description are both exemplary and are intended to provide further explanation of the claimed invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic circuit diagram of a touch display driving circuit according to a first embodiment of the present invention.

[0023] Figure 2 is disclosed according to Figure 1 the circuit is a step flowchart of its operation method.

[0024] Figure 3 is a schematic structural diagram of an embodiment of the present invention when the touch sensing circuit is a voltage type circuit.

[0025] Figure 4 is a schematic structural diagram of another embodiment of the present invention when the touch sensing circuit is a current type circuit.

[0026] Figure 5 is a schematic voltage waveform diagram of an embodiment of the present invention when the voltage value of the sensing electrode is switched according to (VTSN < VCOM < VTSP).

[0027] Figure 6 is a schematic voltage waveform diagram of another optional embodiment of the present invention when the voltage value of the sensing electrode is switched according to (VTSN < VCOM < VTSP).

[0028] Figure 7 Discloses a system schematic diagram of using the touch display driving circuit shown in the embodiment of the present invention to drive at least one sensing electrode of a touch display panel.

[0029] Figure 8 Based on Figure 7 Timing diagram of operation of the shown architecture.

[0030] Fig. 9 It is a circuit structure diagram of a touch display driving circuit according to a second embodiment of the present invention.

[0031] Fig.10 It is a circuit structure diagram of a touch display driving circuit according to a third embodiment of the present invention.

[0032] Fig.11 It is a circuit structure diagram of a touch display driving circuit according to a fourth embodiment of the present invention.

[0033] Fig.12 It is a circuit structure diagram of a touch display driving circuit according to a fifth embodiment of the present invention.

[0034]

Explanation of symbols

[0035] 21:Analog front-end circuit

[0036] 23A: First regulation circuit

[0037] 23B: Second regulation circuit

[0038] 25: Charge Pump Circuit

[0039] 100, 100A, 100B, 100C, 100D: Touch display drive circuit

[0040] 102: Source driver

[0041] 104: Touch sensing circuit

[0042] 111: Sensing electrode

[0043] 141: First source drive operational amplifier

[0044] 142: Second source drive operational amplifier

[0045] 300: Touch display panel

[0046] AVDD: First operating voltage

[0047] AVEE: Second operating voltage

[0048] AGND: Ground voltage

[0049] VCOM: Common mode electrode voltage

[0050] VTSP: The third operating voltage

[0051] VTSN: Fourth operating voltage

[0052] TX_IN: Transmitter input signal

[0053] VDD: power supply voltage

[0054] TX_OUT: Transmitter output signal

[0055] SWA, SWD: Switching elements

[0056] S202, S204: Steps

[0057] T display :Show time

[0058] T sense :Sensing time

[0059] Sense_H: Sense high level voltage

[0060] Sense_L: Sense low level voltage DETAILED DESCRIPTION

[0061] The embodiments of the present invention will be further explained below with reference to the accompanying drawings. As much as possible, the same reference numerals represent the same or similar components in the drawings and the specification. In the drawings, shapes and thicknesses may be exaggerated for simplicity and convenience. It is understood that the components not specifically shown in the drawings or described in the specification are known to those skilled in the art. Those skilled in the art may make various changes and modifications based on the contents of the present invention.

[0062] Unless otherwise specified, some conditional sentences or words, such as "can", "could", "might", or "may", are generally intended to express that the embodiments of the present application have, but may also be interpreted as features, elements, or steps that may not be required. In other embodiments, these features, elements, or steps may not be required.

[0063] In the following description of "one embodiment" or "an embodiment" refers to a specific element, structure or feature associated with at least one embodiment. Therefore, multiple descriptions of "one embodiment" or "an embodiment" appearing in multiple places below do not refer to the same embodiment. Furthermore, specific components, structures and features in one or more embodiments can be combined in an appropriate manner.

[0064] Certain words are used in the specification and claims to refer to specific components. However, those skilled in the art should understand that the same component may be referred to by different nouns. The specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of the components as a basis for distinction. The term "including" mentioned in the specification and claims is an open-ended term, so it should be interpreted as "including but not limited to". In addition, "coupling" here includes any direct and indirect connection means. Therefore, if the text describes a first component coupled to a second component, it means that the first component can be directly connected to the second component through electrical connection or signal connection methods such as wireless transmission, optical transmission, etc., or indirectly electrically or signal connected to the second component through other components or connection means.

[0065] The disclosure is particularly described with the following examples, which are only used for illustration, because for those skilled in the art, various changes and modifications can be made without departing from the spirit and scope of the disclosure, so the protection scope of the disclosure should be determined by the scope defined in the attached claims. Throughout the specification and claims, unless the content clearly specifies, the meaning of "one" and "the" includes this type of description including "one or at least one" of the elements or components. In addition, as used in the present disclosure, unless it is obvious from the specific context that multiple is excluded, the singular article also includes the description of multiple elements or components. Moreover, when applied in this description and in all the claims below, unless the content clearly specifies, the meaning of "in which" may include "in which" and "on it". The terms used in the specification and claims throughout the text, unless otherwise specified, generally have the ordinary meaning of each term used in this field, in the content disclosed herein and in the special content. Certain terms used to describe the present disclosure will be discussed below or elsewhere in this specification to provide practitioners with additional guidance in describing the present disclosure. The use of examples anywhere throughout the specification, including examples of any term discussed herein, is for illustrative purposes only and certainly does not limit the scope and meaning of the present disclosure or any exemplified term. Likewise, the present disclosure is not limited to the various embodiments set forth in this specification.

[0066] In the following paragraphs, the present invention will provide a touch display driving circuit that can be used to drive at least one sensing electrode of a touch display panel. At the same time, the present invention provides an operating method of the touch display driving circuit. According to the touch display driving circuit and the operating method disclosed in the present invention, the power consumption of the touch display panel or the device thereof using the present invention can be optimized. The touch display driving circuit and related technologies disclosed in the present invention below are not limited to the embodiments listed in this application, and can also be applied to other equal circuit architectures, which the applicant hereby makes clear.

[0067] Please refer to Figure 1 , which is a schematic diagram of the circuit structure of a touch display driving circuit according to a first embodiment of the present invention. Figure 2 It is a public basis Figure 1 As shown in the attached figure, the present invention provides a touch display driving circuit 100, and the touch display driving circuit 100 can be used to drive at least one sensing electrode of a touch display panel.

[0068] According to an embodiment of the present invention, the touch display driving circuit 100 includes a source driver 102 . The source driver 102 is operable and electrically coupled to a first operating voltage AVDD and a second operating voltage AVEE.

[0069] Specifically, if Figure 1 As shown, the source driver 102 includes a first source driver operational amplifier 141 and a second source driver operational amplifier 142, and the first source driver operational amplifier 141 and the second source driver operational amplifier 142 are connected in series. In addition, the first source driver operational amplifier 141 is electrically coupled between the first operating voltage AVDD and a ground voltage AGND, so that the first source driver operational amplifier 141 is a positive-polarity operational amplifier and can operate in a positive-voltage domain.

[0070] On the other hand, the second source driver operational amplifier 142 is electrically coupled between the aforementioned second operating voltage AVEE and the ground voltage AGND, so that the second source driver operational amplifier 142 is a negative-polarity operational amplifier and can operate in a negative voltage domain. According to a preferred embodiment of the present invention, the first source driver operational amplifier 141 and the second source driver operational amplifier 142 can be circuits made by using medium voltage (MV) components.

[0071] In addition, in order to effectively sense the input contact signal, the touch display driving circuit 100 disclosed in the present invention also includes a touch sensing circuit 104, and the touch sensing circuit 104 senses the input contact signal to drive the sensing electrode (sensing pad) in the touch display panel. For example, the input contact signal can be, for example, a user's finger, a stylus, or any other object or item that can generate a contact signal. The touch sensing circuit 104 disclosed in the present invention is electrically coupled to a third operating voltage VTSP and a fourth operating voltage VTSN to drive the sensing electrode of the touch display panel. For further information, please refer to Figure 3 and Figure 4 As shown, it specifically discloses a circuit schematic diagram of the touch sensing circuit disclosed in the present invention.

[0072] in, Figure 3 It is disclosed that the touch sensing circuit 104 is a voltage-type circuit design for receiving a transmitter input signal TX_IN to generate a transmitter output signal TX_OUT, and using the transmitter output signal TX_OUT to drive the sensing electrode 111 of the touch display panel. On the other hand, Figure 4 Another implementation is disclosed, wherein, when the touch sensing circuit 104 is a current-type circuit design, the current-type circuit design can also be used to receive a transmitting end input signal TX_IN and generate a transmitting end output signal TX_OUT, so as to utilize the transmitting end output signal TX_OUT to drive the sensing electrode 111 of the touch display panel. Figure 3 and Figure 4 The two different circuit designs shown can both be used to implement the touch sensing circuit 104 disclosed in the present invention. However, the present invention is not limited to the exemplary embodiments given here.

[0073] Regarding the operation method of the touch display driving circuit of the present invention, please refer to Figure 2 The flowchart shown is as follows: Figure 2The several steps listed are to disclose the operation method of the touch display driving circuit 100 according to the present invention. As mentioned above, the touch display driving circuit 100 includes the source driver 102 and the touch sensing circuit 104, and the touch sensing circuit 104 is preferably an analog front-end circuit (AFE circuit) 21, and is electrically coupled to at least one sensing electrode of the touch display panel through the analog front-end circuit 21. According to step S202 disclosed in the present invention, the present invention first provides a first operating voltage AVDD and a second operating voltage AVEE to the source driver 102, so that the source driver 102 is electrically coupled to the first operating voltage AVDD and the second operating voltage AVEE. At the same time, according to the present invention Figure 1 , 3 As shown in FIG. 4 , the touch sensing circuit 104 can preferably be the analog front-end circuit 21, and the analog front-end circuit 21 can be a circuit made by using medium voltage components. Afterwards, in step S204, the present invention then provides a third operating voltage VTSP and a fourth operating voltage VTSN to the analog front-end circuit 21, so that the analog front-end circuit 21 is electrically coupled to the at least one sensing electrode 111 in the touch display panel.

[0074] In the technical solution of the present invention, the first operating voltage AVDD and the second operating voltage AVEE of the source driver 102 are different from the third operating voltage VTSP and the fourth operating voltage VTSN of the analog front-end circuit 21 .

[0075] Looking further, in an embodiment of the present invention, the analog front-end circuit 21 has an operable voltage drop, and this operable voltage drop has a maximum value, which can be defined as "VACS". According to the technical solution of the present invention, the voltage difference between the third operating voltage VTSP and the fourth operating voltage VTSN of the analog front-end circuit 21 will be less than the maximum value of the operable voltage drop of the analog front-end circuit 21, that is: (VTSP - VTSN) < VACS. For example, in an embodiment of the present invention, the third operating voltage VTSP can be, for example, +3 volts (V), and the fourth operating voltage VTSN can be, for example, -3 volts (V); in another embodiment, the third operating voltage VTSP can also be, for example, +4 volts (V), and the fourth operating voltage VTSN can be, for example, -2 volts (V); or, in yet another embodiment, the third operating voltage VTSP can also be +2 volts (V), and the fourth operating voltage VTSN can also be, for example, -1 volts (V). It should be noted that the present invention is not limited by the voltage values listed here. According to the present invention, the main thing is to set the third operating voltage VTSP of the analog front-end circuit 21 to be greater than the common-mode electrode voltage VCOM of the sensing electrode, and at the same time, set the fourth operating voltage VTSN of the analog front-end circuit 21 to be less than the common-mode electrode voltage VCOM of the sensing electrode. In this way, the operable voltage range of the analog front-end circuit 21 (that is, VTSP - VTSN) can cover the common-mode electrode voltage VCOM. In view of this, when the touch display panel is used to perform a display function, the sensing electrode of the touch display panel is electrically coupled to the common-mode electrode voltage VCOM, and the common-mode electrode voltage VCOM is between the third operating voltage VTSP and the fourth operating voltage VTSN of the analog front-end circuit 21. As for when the touch display panel is used to sense a contact, the sensing electrode of the touch display panel is electrically coupled to a sensing voltage, and this sensing voltage is less than the third operating voltage VTSP of the analog front-end circuit 21, and this sensing voltage is greater than the fourth operating voltage VTSN of the analog front-end circuit 21. That is to say, based on the technical solution disclosed in the present invention, it can be clearly seen that when the touch display panel switches between different operating modes (display and sensing modes), the switching of the voltage value of its sensing electrode is based on the common-mode electrode voltage VCOM, the third operating voltage VTSP of the analog front-end circuit 21, and the fourth operating voltage VTSN. Therefore, the present invention can significantly eliminate the redundant switching time required for voltage switching in the prior art.

[0076] Looking in detail, please refer to Figure 5 and Figure 6As shown, two implementation modes are drawn in which the switching of the voltage value of the sensing electrode of the present invention is based on (VTSN < VCOM < VTSP). First, it can be seen that when the touch display panel is used to perform a display function during a display time "T display ", the sensing electrode is electrically coupled to the common-mode electrode voltage VCOM. Then, when the touch display panel is used to sense a contact (input contact signal) during a sensing time "T sense ", the sensing electrode is instead electrically coupled to a sensing voltage. In Figure 5 's embodiment, when the touch display panel is used to perform a sensing function during the sensing time "T sense ", the operable voltage range of the sensing voltage is between the common-mode electrode voltage VCOM and a sensing high-level voltage Sense_H. However, the present invention is of course not limited to this example. In Figure 6 's embodiment, when the touch display panel is used to perform a sensing function during the sensing time "T sense ", the operable voltage range of the sensing voltage can also be between the sensing high-level voltage Sense_H and a sensing low-level voltage Sense_L. Generally speaking, according to the technical solution disclosed in the present invention, the voltage value of the sensing voltage can optionally be between VTSP and VTSN, making it less than the third operating voltage VTSP and greater than the fourth operating voltage VTSN, while covering the common-mode electrode voltage VCOM described above.

[0077] In this way, it can be assured that when the touch display driving circuit and its operation method disclosed in the present invention are used to drive the sensing electrode of the touch display panel, the touch display panel can have better power performance compared to a traditional touch display panel. This is because when the panel switches between the display mode and the sensing mode, the time for voltage switching is significantly reduced. And due to the reduced power consumption, the power consumption of the total integrated chip of the overall touch display panel is also reduced accordingly, and at the same time, the purpose of avoiding waste of excess electric energy can be achieved. In other words, the applicant can effectively solve the long-existing problem of excessive power consumption in the prior art through the touch display driving circuit and its operation method disclosed in the present invention.

[0078] Looking further, please refer to Figure 7 As shown, it is a system schematic diagram of using the touch display driving circuit shown in the embodiment of the present invention to drive at least one sensing electrode 111 of a touch display panel 300, Figure 8 is according to Figure 7Operation timing diagram of the architecture shown. As can be seen from the two figures, when the touch display panel 300 shown is used to perform display, the switch element SWA is in the open state (ON), so that the sensing electrode 111 can be electrically coupled to the common mode electrode voltage VCOM. As for, when the touch display panel 300 shown is switched to perform sensing contact, the switch element SWA is closed, and the switch element SWD is opened to an open state, so that the sensing electrode 111 can be switched to a sensing voltage electrically coupled between a sensing high level voltage Sense_H and a sensing low level voltage Sense_L. As the technical content disclosed in the previous paragraphs of the present invention, the voltage range of the sensing voltage is less than the third operating voltage VTSP and greater than the fourth operating voltage VTSN. Therefore, when the touch display panel switches between different operating modes, the operating voltage switching of its sensing electrode can be controlled between the third operating voltage VTSP, the common mode electrode voltage VCOM, and the fourth operating voltage VTSN, thereby avoiding redundant power switching losses. Therefore, it can be confirmed that the application of the present invention can achieve the optimization performance of the power consumption of a touch display panel.

[0079] then, Fig. 9 1 is a circuit structure diagram of a touch display driving circuit according to a second embodiment of the present invention. As shown in the second embodiment of the present invention, the touch display driving circuit 100A further includes a first regulating circuit 23A and a second regulating circuit 23B, and the analog front-end circuit 21 is electrically coupled to the first regulating circuit 23A and the second regulating circuit 23B. In this embodiment, the first regulating circuit 23A is electrically coupled to the first operating voltage AVDD, and the second regulating circuit 23B is electrically coupled to the second operating voltage AVEE. Through this circuit configuration, the third operating voltage VTSP of the analog front-end circuit 21 can be generated by the first operating voltage AVDD. In addition, the fourth operating voltage VTSN of the analog front-end circuit 21 can be generated by the second operating voltage AVEE.

[0080] The present invention is not limited to this circuit configuration. Fig.10 , which is a schematic diagram of the circuit structure of a touch display driving circuit of a third embodiment of the present invention. As shown in the third embodiment of the present invention, the touch display driving circuit 100B can also selectively include only a second regulating circuit 23B, so that the analog front-end circuit 21 is only electrically coupled to the second regulating circuit 23B. In this embodiment, the second regulating circuit 23B is electrically coupled to the second operating voltage AVEE, and through this circuit configuration, the fourth operating voltage VTSN of the analog front-end circuit 21 can be generated by the second operating voltage AVEE. In this embodiment, the third operating voltage VTSP of the analog front-end circuit 21 is a power supply voltage VDD.

[0081] Furthermore, Fig.11 1 is a circuit structure diagram of a touch display driving circuit according to a fourth embodiment of the present invention. As shown in the fourth embodiment of the present invention, the touch display driving circuit 100C may also selectively not have the aforementioned adjustment circuit. In this case, the third operating voltage VTSP and the fourth operating voltage VTSN of the analog front-end circuit 21 are independent of the first operating voltage AVDD and the second operating voltage AVEE of the source driver. In this variant embodiment, the third operating voltage VTSP and the fourth operating voltage VTSN of the analog front-end circuit 21 may be generated by an external power chip, and may also be used to implement the purpose of the present invention.

[0082] Furthermore, Fig.12 is a circuit structure diagram of a touch display driving circuit according to a fifth embodiment of the present invention. Fig.12 The embodiment shown is based on Fig.11 Modification examples of Fig.11 In contrast, the present invention Fig.12 The touch display driving circuit 100D disclosed in the disclosure further includes a charge pump circuit 25, which is electrically coupled between the third operating voltage VTSP and the fourth operating voltage VTSN, so that the fourth operating voltage VTSN is an inverted signal of the third operating voltage VTSP, that is, (VTSN=(-1)*VTSP), and this circuit configuration can also be used to implement the purpose of the invention of the present invention. In summary, it can be seen that according to the several technical solutions disclosed above provided by the applicant, it is sufficient to see that the present invention is not limited to the above-mentioned embodiments. In other words, for a technician who is familiar with the art and has general knowledge, he can make appropriate modifications or changes according to different circuit specifications and / or requirements without departing from the claims of the present invention. In other words, the present invention is compatible with such alternative exemplary examples, and the implementation methods of such variant embodiments and / or circuits should still be protected by the scope of the claims of the present invention.

[0083] In summary, according to at least one embodiment disclosed in the present invention, it can be confirmed that the touch display driving circuit and the operation method thereof disclosed in the present invention are intended to control the third operating voltage VTSP of the analog front-end circuit to be greater than the common-mode electrode voltage VCOM of the sensing electrode, and at the same time, the fourth operating voltage VTSN of the analog front-end circuit is less than the common-mode electrode voltage VCOM. In this way, the present invention can effectively optimize the power consumption of the touch display panel device, and avoid and suppress the waste of power consumption caused by switching the panel device between the display and sensing modes.

[0084] It is obvious that by adopting the technical solution disclosed in the present invention, the present application can be used to significantly reduce power loss. Compared with the prior art, it can not only obviously and effectively solve many deficiencies in the prior art, but also present more efficient circuit performance. At the same time, based on the technical solution disclosed in the present invention, it can not only be applied to common electronic components, but also can be widely used in various electronic circuit components such as the semiconductor industry, the integrated circuit industry, or power electronics. It is obvious that the technical solution requested by the applicant in this case does have excellent industrial applicability and competitiveness. At the same time, the technical features, methods and means disclosed in the present invention and the effects achieved are significantly different from the current solutions, which are not easy to be accomplished by those skilled in the art, but should have patent requirements.

[0085] The embodiments described above are only for illustrating the technical ideas and features of the present invention, and their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. They cannot be used to limit the scope of protection required by the claims of the present invention, that is, all equivalent changes or modifications made according to the spirit disclosed by the present invention should still be included in the scope of protection required by the claims of the present invention.

Claims

1. A touch display driving circuit, adapted to drive at least one sensing electrode of a touch display panel, the touch display driving circuit comprising: A source driver electrically coupled to a first operating voltage and a second operating voltage; as well as An analog front-end circuit is electrically coupled to at least one sensing electrode of the touch display panel, and the analog front-end circuit is electrically coupled to a third operating voltage and a fourth operating voltage, wherein the first operating voltage and the second operating voltage of the source driver are different from the third operating voltage and the fourth operating voltage of the analog front-end circuit.

2. The touch display driving circuit according to claim 1, wherein: The third operating voltage of the analog front-end circuit is greater than a common-mode electrode voltage of the at least one sensing electrode, and the fourth operating voltage of the analog front-end circuit is less than the common-mode electrode voltage of the at least one sensing electrode.

3. The touch display driving circuit according to claim 1, wherein: The third operating voltage of the analog front-end circuit is VTSP, the fourth operating voltage of the analog front-end circuit is VTSN, and the analog front-end circuit has an operable voltage drop, the maximum value of the operable voltage drop is VACS, such that (VTSP-VTSN) <VACS。 4. The touch display driving circuit according to claim 1, wherein: The source driver includes a first source driving operational amplifier and a second source driving operational amplifier, the first source driving operational amplifier and the second source driving operational amplifier are connected in series, and the first source driving operational amplifier is electrically coupled between the first operating voltage and the ground voltage, and the second source driving operational amplifier is electrically coupled between the second operating voltage and the ground voltage.

5. The touch display driving circuit according to claim 4, wherein: The first source driving operational amplifier is a positive polarity operational amplifier, which operates in a positive voltage domain.

6. The touch display driving circuit according to claim 4, wherein: The second source driving operational amplifier is a negative polarity operational amplifier, which operates in a negative voltage domain.

7. The touch display driving circuit according to claim 4, wherein: The first source driving operational amplifier and the second source driving operational amplifier are made by using medium voltage components.

8. The touch display driving circuit according to claim 1, wherein: The analog front-end circuit is made by using medium voltage components.

9. The touch display driving circuit according to claim 1, wherein: When the touch display panel is used for display, the at least one sensing electrode of the touch display panel is electrically coupled to the common mode electrode voltage.

10. The touch display driving circuit according to claim 1, wherein: When the touch display panel is used to sense contact, the at least one sensing electrode of the touch display panel is electrically coupled to a sensing voltage, the sensing voltage is less than the third operating voltage, and the sensing voltage is greater than the fourth operating voltage.

11. The touch display driving circuit as described in claim 1 further includes at least one regulating circuit, and the analog front-end circuit is electrically coupled to the at least one regulating circuit, so that the third operating voltage or the fourth operating voltage of the analog front-end circuit is generated by the first operating voltage or the second operating voltage of the source driver.

12. The touch display driving circuit according to claim 1, wherein: The third operating voltage or the fourth operating voltage of the analog front-end circuit can selectively be a power supply voltage or be generated via an external power chip.

13. An operating method of a touch display driving circuit, which is suitable for driving at least one sensing electrode of a touch display panel, the touch display driving circuit comprising a source driver and an analog front-end circuit electrically coupled to the at least one sensing electrode, the operating method comprising: Providing a first operating voltage and a second operating voltage to the source driver; as well as A third operating voltage and a fourth operating voltage are provided to the analog front-end circuit, wherein the first operating voltage and the second operating voltage are different from the third operating voltage and the fourth operating voltage.

14. The operating method according to claim 13, wherein: The third operating voltage of the analog front-end circuit is greater than the common-mode electrode voltage of the at least one sensing electrode, and the fourth operating voltage of the analog front-end circuit is less than the common-mode electrode voltage of the at least one sensing electrode.

15. The operating method according to claim 13, wherein: The third operating voltage of the analog front-end circuit is VTSP, the fourth operating voltage of the analog front-end circuit is VTSN, and the analog front-end circuit has an operable voltage drop, the maximum value of the operable voltage drop is VACS, such that (VTSP-VTSN) <VACS。 16. The operating method according to claim 13, wherein: The source driver includes a first source driver operational amplifier and a second source driver operational amplifier, the first source driver operational amplifier and the second source driver operational amplifier are connected in series, and the first source driver operational amplifier is electrically coupled between the first operating voltage and the ground voltage, and the second source driver operational amplifier is electrically coupled between the second operating voltage and the ground voltage. The first source driver operational amplifier is a positive polarity operational amplifier, which operates in a positive voltage domain, and the second source driver operational amplifier is a negative polarity operational amplifier, which operates in a negative voltage domain.

17. The operating method according to claim 16, wherein: The first source driving operational amplifier and the second source driving operational amplifier are made by using medium voltage components.

18. The operating method according to claim 13, wherein: The analog front-end circuit is made by using medium voltage components.

19. The operating method according to claim 13, wherein: When the touch display panel is used for display, at least one sensing electrode of the touch display panel is electrically coupled to a common mode electrode voltage, and when the touch display panel is used for sensing contact, at least one sensing electrode of the touch display panel is electrically coupled to a sensing voltage, which is less than the third operating voltage and greater than the fourth operating voltage.

20. The operating method according to claim 13, wherein: The analog front-end circuit is electrically coupled to at least one regulating circuit, so that the third operating voltage or the fourth operating voltage of the analog front-end circuit is generated by the first operating voltage or the second operating voltage of the source driver.

21. The operating method according to claim 13, wherein: The third operating voltage or the fourth operating voltage of the analog front-end circuit can selectively be a power supply voltage or be generated via an external power chip.

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