touch screen

Abstract

The embodiment of the present application discloses a touch screen including a multiplexing circuit and a mistake prevention charging circuit. The multiplexing circuit includes a multiplexing unit, and the multiplexing unit includes a first selection transistor and a second selection transistor; the mistake prevention charging circuit includes an inverse control unit; the inverse control unit includes a first inverse transistor and a second inverse transistor. The inverse control unit is used for controlling the first inverse transistor to be turned on to pull or maintain the level of the control electrode of the second selection transistor at an invalid level in response to the first selection signal being at an effective level; and controlling the second inverse transistor to be turned on to pull or maintain the level of the control electrode of the first selection transistor at an invalid level in response to the second selection signal being at an effective level, so as to prevent display abnormalities caused by the error transmission of the data signal due to the selection signal delay.

Description

Technical Field

[0001] This application relates to the field of display technology, and more particularly to a touch screen. Background Technology

[0002] As touchscreens evolve towards larger sizes, higher resolutions, and narrower bezels (such as in-vehicle infotainment screens and foldable phones), In-cell touch technology has become the mainstream solution due to its advantages of thin and light-transmitting structure and high light transmittance. This In-cell touch technology directly embeds the touch sensor (Sensor Pad) into the liquid crystal pixel layer, using time-division multiplexing to achieve coordinated processing of display and touch signals. Currently, Touch Panel Multiplexer (TP MUX) technology uses transistor switching to provide a single touch signal to multiple touch sensors in a time-division manner, reducing the number of touch ICs and thus lowering cost and power consumption. However, the larger size, higher resolution, and narrower bezel designs increase the RC load on the traces, exacerbating the delay of the selection signal transmitted through the traces. This can lead to touch signals being incorrectly provided to touch sensors that do not require detection. Summary of the Invention

[0003] This application provides a touch screen that, through the design of a multiplexing circuit and a fault-proof charging circuit, effectively provides touch signals to multiple touch units (touch sensors), avoids signal interference and false detection, and improves the touch performance of the touch screen.

[0004] On one hand, this application provides a touch screen, including: a touch panel; the touch panel includes a plurality of touch units; each touch unit is used to respond to a touch signal to detect a change in capacitance of the touch panel; a multiplexing circuit; the multiplexing circuit includes at least one first multiplexing unit, the first multiplexing unit including a first selection transistor and a second selection transistor, wherein; the source and drain of the first selection transistor are connected between a first signal input line for providing the touch signal and a first touch unit, and the control electrode of the first selection transistor is connected to a first selection control line; and the source and drain of the second selection transistor are connected between the first signal input line and a second touch unit, and the control electrode of the second selection transistor is connected to a second selection control line; and a fault-proof charging circuit; the fault-proof charging circuit includes a first inverting control unit corresponding to the first multiplexing unit, the first inverting control unit including a first inverting control group and a second inverting control group; wherein the first inverting control group includes a first inverting transistor, and the second inverting control group includes a second inverting transistor, wherein; the source and drain of the first inverting transistor are connected between a second selection control line and a low-potential power supply line, the first inverting control group including a first inverting transistor, and the second inverting control group including ... control group, and the second inverting control group including a first inverting control group, and the second inverting control group including a second inverting transistor, and the first inverting control group including a first inverting control group, and the second inverting control group including a second inverting control group, and the second inverting control group including a first inverting The control electrode of the first inverting transistor is connected to the first selection control line; and the source and drain of the second inverting transistor are connected between the first selection control line and the low-potential power line, and the control electrode of the second inverting transistor is connected to the second selection control line; wherein, the first multiplexing unit is used to turn on the first selection transistor and the second selection transistor respectively in response to the first selection signal transmitted by the first selection control line and the second selection signal transmitted by the second selection control line being at an active level in turn, so as to connect the electrical connection between the first signal input line and the first touch unit and the second touch unit in a time-division manner, so as to provide the touch signal to the first touch unit and the second touch unit respectively; and the first inverting control unit is used to turn on the second inverting transistor in response to the first selection signal being at an active level, so as to pull the level of the control electrode of the second selection transistor back to or maintain it at an inactive level using the low-potential power signal transmitted by the low-potential power line; and to turn on the first inverting transistor in response to the second selection signal being at an active level, so as to pull the level of the control electrode of the first selection transistor back to or maintain it at an inactive level using the low-potential power signal.

[0005] The touchscreen provided in this application embodiment firstly achieves time-division control of the selection signal by setting a multiplexing circuit, thus realizing the effective time-division provision of touch signals required by multiple touch units, avoiding signal interference, reducing the number of touch chips used, reducing power consumption, and saving costs. Secondly, through the design of the error-proof charging circuit, when the second selection signal corresponding to the second touch unit is at an active level, the first selection signal corresponding to the first touch unit is pulled back to or maintained at an inactive level, avoiding mischarging of the first touch unit, thereby reducing false detections and improving the touch performance of the touchscreen. Attached Figure Description

[0006] The present application will be further described below with reference to the accompanying drawings. It should be noted that the accompanying drawings described below are merely for explaining some embodiments of the present application. Those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0007] Figure 1 This is a structural block diagram of a touch screen in the related technology provided in the embodiments of this application.

[0008] Figure 2 Provided for the embodiments of this application Figure 1 An exemplary schematic diagram of the ideal control timing for a touchscreen is shown.

[0009] Figure 3 Provided for the embodiments of this application Figure 1 The diagram shows an exemplary schematic of the actual control timing of the touchscreen.

[0010] Figure 4 An exemplary structural block diagram of a touch screen for a MUX1:2 provided in an embodiment of this application.

[0011] Figure 5 Provided for the embodiments of this application Figure 4 An exemplary schematic diagram of the control timing of the touch screen is shown.

[0012] Figure 6 An exemplary structural block diagram of a touch screen with a MUX 1:3 aspect ratio is provided for embodiments of this application.

[0013] Figure 7 Provided for the embodiments of this application Figure 6 An exemplary schematic diagram of the control timing of the touch screen is shown. Detailed Implementation

[0014] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0015] The terms "first," "second," etc., used in this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or modules is not limited to the listed steps or modules, but may optionally include steps or modules not listed, or may optionally include other steps or modules inherent to these processes, methods, products, or devices.

[0016] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0017] In the field of touch display, a touch screen can contain multiple touch sensors (Sensor Pads) arranged in an array. When performing touch detection on the touch screen, the touch signal (TP signal) and a first reference electrical signal (or described as a common terminal signal, or simply COM signal) are sequentially provided to multiple Sensor Pads to detect changes in capacitance of different Sensor Pads. Based on the above, and considering efficiency and cost reduction, when it is necessary to reduce the number of touch ICs (chips that provide TP and / or COM signals) used in the touch screen, using MUX multiplexing can effectively reduce the number of touch signal input channels. Since the number of physical input channels provided by each Touch IC is limited, with the number of Sensor Pads remaining constant, the number of required physical input channels can be reduced through MUX multiplexing. This allows a single Touch IC to support touch detection for more Sensor Pads, thus reducing the number of Touch ICs used. For example, if a touchscreen needs to support touch detection for 1000 sensor pads, and a single Touch IC supports 100 input channels, then using touch detection without a MUX multiplexing would require 1000 ÷ 100 = 10 Touch ICs. However, using MUX 1:4 multiplexing for touch detection would reduce the number of physical input channels to (1000 ÷ 4 = 250 input channels, 250 ÷ 100 ≈ 3, rounded up) 3 Touch ICs.

[0018] For example, see Figure 1 and Figure 2 As shown, the touchscreen 100 includes a TP MUX1:2 circuit. The TP MUX1:2 circuit can sequentially activate selection signals transmitted through the two selection control lines TP_MUXA and TP_MUXB, turning on selection transistors K1 and K2 in a time-division manner. This splits one TP signal output from the Touch IC into two TP signals, enabling time-division detection of Sensor Pad(n) and Sensor Pad(n+1). The touchscreen 100 also includes a COM MUX1:2 circuit. The COM MUX1:2 circuit can use selection signals transmitted through the two selection control lines COM_MUXA and COM_MUXB to select transistors K3 and K4, splitting one COM signal output from the Touch IC into two COM signals to maintain the display of Sensor Pad(n) and Sensor Pad(n+1). For details, see [link to details]. Figure 2As shown, the selection signals transmitted by the two selection control lines TP_MUXA and TP_MUXB are sequentially active, providing the TP signal to SensorPad(n) and SensorPad(n+1) in a time-division multiplexing manner to sequentially realize touch detection on SensorPad(n) and SensorPad(n+1). Simultaneously, the selection signals transmitted by the two selection control lines COM_MUXA and COM_MUXB are sequentially active, providing the COM signal to SensorPad(n+1) and SensorPad(n) in a time-division multiplexing manner to sequentially maintain the display on SensorPad(n+1) and SensorPad(n). In general, when SensorPad(n) receives the TP signal for touch detection, SensorPad(n+1) receives the COM signal to maintain the display; when SensorPad(n+1) receives the TP signal for touch detection, SensorPad(n) receives the COM signal to maintain the display. Here, as... Figure 2 As shown, the effective level can refer to the selection signal being at a high level. The ineffective level can refer to the selection signal being at a low level. It should be noted that the effective level and the ineffective level are relative and depend on the type of selection transistors K1 to K4, and this application does not impose any limitations on them.

[0019] The above design reduces the number of Touch ICs required. However, in practical use, as touchscreens become larger, higher resolution, and have narrower bezels (such as in-vehicle infotainment screens and foldable phones), the RC load on the traces transmitting the selection signal increases, exacerbating the delay in the selected signal transmission. This can lead to the touch signal being incorrectly provided to a Sensor Pad that does not require touch detection at that time (e.g., a Sensor Pad that has already completed touch detection). For example, as... Figure 3 As shown, due to the increased RC load on the trace transmitting the selection signal, the falling edge delay of the selection signal transmitted on the selection control line TP_MUXA is aggravated. In this case, when the selection signal transmitted on the selection control line P_MUXB transitions from an invalid level to an active level, the selection signal transmitted on the selection control line TP_MUXA has not yet dropped to an invalid level. At this time, the selection transistor K1 remains in the ON state, i.e., as... Figure 3 The upward arrow indicates that when the selection control line TP_MuxB is connected, the selection control line TP_MuxA is not closed. In this case, both Sensor Pad(n) and Sensor Pad(n+1) will receive the TP signal, leading to incorrect detection of Sensor Pad(n). The analysis of the remaining selection signals and selection transistors can be found in the previous explanation and will not be repeated here.

[0020] Based on this, this application provides a touch screen that, through the design of a multiplexing circuit and an error-proof charging circuit, can effectively provide touch signals to multiple touch units (touch sensors) by adding a DC signal at an invalid level, thereby avoiding signal interference and false detection and improving the touch performance of the touch screen.

[0021] Specifically, in order to understand this application, the following detailed description is provided in conjunction with the following embodiments.

[0022] Example 1 Mux1:2 See Figure 4 The diagram illustrates an exemplary structural schematic of a touchscreen comprising TP MUX1:2 and COM MUX1:2, provided in an embodiment of this application. Figure 4 The touchscreen 100 may include: a touch panel 10; the touch panel 10 includes a plurality of touch units; each touch unit is used to detect a change in capacitance of the touch panel in response to a touch signal (TP signal); a multiplexing circuit 20; the multiplexing circuit 20 includes at least one first multiplexing unit 201, the first multiplexing unit 201 including a first selection transistor K11 and a second selection transistor K12, wherein; the source and drain of the first selection transistor K11 are connected between a first signal input line TP1 for providing the touch signal and a first touch unit (e.g., Pad(n)), and the control electrode of the first selection transistor K11 is connected to a first selection control line TP_MUXA1; and the source and drain of the second selection transistor K12 are connected between the first signal input line TP1 and a second touch unit (e.g., Pad(n+1)), and the control electrode of the second selection transistor K12 is connected to a second... The system includes a selection control line TP_MUXB1 connection and a fault-proof charging circuit 30. The fault-proof charging circuit 30 includes a first inverting control unit 301 corresponding to the first multiplexing unit 201. The first inverting control unit 301 includes a first inverting control group and a second inverting control group. The first inverting control group includes a first inverting transistor TA1, and the second inverting control group includes a second inverting transistor TB1. The source and drain of the first inverting transistor TA1 are connected between the second selection control line TP_MUXB1 and the low-potential power line VGL. The control electrode of the first inverting transistor TA1 is connected to the first selection control line TP_MUXA1. The source and drain of the second inverting transistor TB1 are connected between the first selection control line TP_MUXA1 and the low-potential power line VGL. The control electrode of the second inverting transistor TB1 is connected to the second selection control line TP_MUXB1.

[0023] based on Figure 4The touchscreen shown has a first multiplexing unit 201 that is activated in response to the first selection signal transmitted via the first selection control line TP_MUXA1 and the second selection signal transmitted via the second selection control line TP_MUXB1. This activates the first selection transistor K11 and the second selection transistor K12, respectively, to time-division multiplex the electrical connections between the first signal input line TP1 and the first touch unit (e.g., Pad(n)) and the second touch unit (e.g., Pad(n+1)), thus enabling the first touch unit (e.g., Pad(n)) and the second touch unit (e.g., Pad(n+1)) to connect. The unit (e.g., Pad(n+1)) provides the touch signal; and the first inverting control unit 301 is configured to, in response to the first selection signal being at an active level, turn on the second inverting transistor TB1 to pull the level of the control electrode of the second selection transistor K12 back to or maintain it at an inactive level using the low-potential power signal transmitted via the low-potential power line VGL; and in response to the second selection signal being at an active level, turn on the first inverting transistor TA1 to pull the level of the control electrode of the first selection transistor K11 back to or maintain it at an inactive level using the low-potential power signal.

[0024] For the specific work sequence, please refer to Figure 5 As shown, for the transmission of the TP signal, the first selection signal transmitted by the first selection control line TP_MUXA1 and the second selection signal transmitted by the second selection control line TP_MUXB1 are sequentially at valid levels. The TP signal is transmitted to the first touch unit (e.g., Pad(n)) and the second touch unit (e.g., Pad(n+1)) in a time-division multiplexing manner through the first selection transistor K11 and the second selection transistor K12, respectively. Simultaneously, when the second selection signal corresponding to the second touch unit (e.g., Pad(n+1)) changes from an invalid level to an valid level, the second inverting transistor TB1 is turned on, pulling the level of the control electrode of the first selection transistor K11 corresponding to the first touch unit back to VGL (e.g., ...). Figure 5 The signal timing indicated by the dashed box 1 shown is set to an invalid level, thereby shutting off the transmission channel providing the TP signal to the first touch unit. Similarly, when the first selection signal corresponding to the first touch unit changes from an invalid level to an active level, the first inverting transistor TA1 is turned on, pulling the level of the control electrode of the second selection transistor K12 corresponding to the second touch unit back to VGL (as shown in the image). Figure 5 The signal timing indicated by the dashed box 2 shown is set to an invalid level, thereby shutting off the transmission channel for the TP signal to the second touch unit. Thus, the touchscreen provided in this embodiment of the application, by adding an inverting control unit (such as including a first inverting transistor TA1 and a second inverting transistor TB1), ensures no incorrect charging by connecting a low-potential power signal transmitted via a low-potential power line VGL.

[0025] In some embodiments, while one touch unit receives the touch signal, other touch units connected to the same first signal input line simultaneously receive the first reference electrical signal (which may be simply referred to as the COM1 signal); the multiplexing circuit 20 further includes a second multiplexing unit 202 corresponding to each of the first multiplexing units, the second multiplexing unit 202 including a third selection transistor K21 and a fourth selection transistor K22; wherein, the source and drain of the third selection transistor K21 are connected between the second signal input line COM1 providing the first reference electrical signal and the first touch unit (e.g., Pad(n)), and the control electrode of the third selection transistor K21 is connected to the third selection control line COM_MUXB1; and the source and drain of the fourth selection transistor K22 are connected between the second signal input line COM1 and the second touch unit (e.g., Pad(n+1)), and the control electrode of the fourth selection transistor K22 is connected to the fourth selection control line COM_MUXA1; the error-proof charging circuit 30 further includes... The second multiplexing unit 202 is correspondingly provided with a second inverting control unit 302, which includes a third inverting control group. The third inverting control group includes a third inverting transistor TM1 and a fourth inverting transistor TM2. The source and drain of the third inverting transistor TM1 are connected between the third selection control line COM_MUXB1 and the low-potential power supply line VGL, and the control electrode of the third inverting transistor TM1 is connected to the fourth selection control line COM_MUXA1. The source and drain of the fourth inverting transistor TM2 are connected between the fourth selection control line COM_MUXA1 and the low-potential power supply line VGL, and the control electrode of the fourth inverting transistor TM2 is connected to the third selection control line COM_MUXB1. The first selection signal and the fourth selection signal transmitted by the fourth selection control line COM_MUXA1 are simultaneously at an active level. The second selection signal and the third selection signal transmitted by the third selection control line COM_MUXB1 are simultaneously at an active level.

[0026] It should be noted that, as described above, the COM signal and TP signal must be sent to different touch units simultaneously so that when one touch unit is being detected, the other touch units can display normally. The transmission of the COM signal and the steps to prevent false charging can be understood by referring to the aforementioned transmission of the TP signal and the steps to prevent false charging; they will not be repeated here.

[0027] In some embodiments, the transistors in the first multiplexing unit 201, the second multiplexing unit 202, the first inverting control unit 301, and the second inverting control unit 302 are transistors of the same type. Exemplarily, the transistors in the first multiplexing unit 201, the second multiplexing unit 202, the first inverting control unit 301, and the second inverting control unit 302 are N-type thin-film transistors; the N-type thin-film transistors include thin-film transistors made of high-mobility oxide semiconductor materials; the high-mobility oxide semiconductor materials include indium gallium zinc oxide semiconductor materials, indium zinc oxide semiconductor materials, or indium gallium zinc tin oxide semiconductor materials.

[0028] Example 2 MUX1:3 like Figure 6 The diagram illustrates an exemplary structural schematic of a touchscreen comprising TP MUX1:3 and COM MUX1:3, provided in an embodiment of this application. Figure 6 In the first multiplexing unit 201, a fifth selection transistor K13 is further included. The source and drain of the fifth selection transistor K13 are connected between the first signal input line TP1 and the third touch unit (e.g., Pad(n+2)). The control electrode of the fifth selection transistor K13 is connected to the fifth selection control line TP_MUXC1. The first inverting control group also includes a fifth inverting transistor TA2. The source and drain of the fifth inverting transistor TA2 are connected between the fifth selection control line TP_MUXC1 and the low-potential power supply line VGL. The control electrode of the fifth inverting transistor TA2 is connected to the first selection control line TP_MUXA1. The second inverting control group further includes a sixth inverting transistor TB2, the source and drain of which are connected between the fifth selection control line TP_MUXC1 and the low-potential power supply line VGL, and the control electrode of which is connected to the second selection control line TP_MUXB1; the first inverting control unit 301 further includes a fourth inverting control group; the fourth inverting control group includes a seventh inverting transistor TC1 and an eighth inverting transistor TC2, wherein the source and drain of the seventh inverting transistor TC1 are connected between the first selection control line TP_MUXA1 and the low-potential power supply line VGL, and the control electrode of which is connected to the fifth selection control line TP_MUXC1; and the source and drain of the eighth inverting transistor TC2 are connected between the second selection control line TP_MUXB1 and the low-potential power supply line, and the control electrode of which is connected to the fifth selection control line TP_MUXC1.

[0029] In some embodiments, see Figure 6As shown, while one touch unit receives the touch signal, other touch units connected to the same first signal input line simultaneously receive the second reference electrical signal (which can be simply referred to as the COM2 signal); the multiplexing circuit 20 also includes a third multiplexing unit 203 corresponding to each of the first multiplexing units 201; the third multiplexing unit includes: a sixth selection transistor K31, a seventh selection transistor K32, and an eighth selection transistor K33, wherein; the source and drain of the sixth selection transistor K31 are connected between the third signal input line COM2, which provides the second reference electrical signal (COM2 signal), and the first touch unit (e.g., Pad(n)); the sixth selection... The control electrode of the selection transistor K31 is connected to the sixth selection control line COM_MUXC2; the source and drain of the seventh selection transistor K32 are connected between the third signal input line COM2 and the second touch unit (e.g., Pad(n+1)), and the control electrode of the seventh selection transistor K32 is connected to the seventh selection control line COM_MUXA2; and the source and drain of the eighth selection transistor K33 are connected between the third signal input line COM2 and the third touch unit (e.g., Pad(n+2)), and the control electrode of the eighth selection transistor K33 is connected to the eighth selection control line COM_MUXB2; the error-proof charging circuit 30 also includes a third multiplexed circuit. Unit 203 corresponds to the third inverting control unit 303; the third inverting control unit 303 includes: a ninth inverting transistor TA3, a tenth inverting transistor TB3, and an eleventh inverting transistor TC3, wherein; the source and drain of the ninth inverting transistor TA3 are connected between the sixth selection control line COM_MUXC2 and the low-potential power supply line VGL, and the control electrode of the ninth inverting transistor TA3 is connected to the first selection control line TP_MUXA1; the source and drain of the tenth inverting transistor TB3 are connected between the seventh selection control line COM_MUXA2 and the low-potential power supply line VGL, and the control electrode of the tenth inverting transistor TB3 is connected to the second selection control line TP_MUXA1. The selection control line TP_MUXB1 is connected; and the source and drain of the eleventh inverting transistor TC3 are connected between the eighth selection control line COM_MUXB2 and the low-potential power supply line VGL, and the control terminal of the eleventh inverting transistor TC3 is connected to the fifth selection control line TP_MUXC1; wherein, the first selection signal, the seventh selection signal transmitted by the seventh selection control line COM_MUXA2, and the eighth selection signal transmitted by the eighth selection control line COM_MUXB2 are all at an active level, and the second selection signal, the sixth selection signal transmitted by the sixth selection control line COM_MUXC2, and the eighth selection signal are all at an active level;The fifth selection signal transmitted on the fifth selection control line is simultaneously active at the same level as the sixth and seventh selection signals.

[0030] In practical applications, based on Figure 6 The touchscreen shown here, regarding the transmission of TP signals, please refer to the specific operating timing diagram. Figure 7 As shown, the transmission logic for the TP signal is similar to that in Embodiment 1, except that in Embodiment 2, it is a loop between three selection signals. Specifically, as... Figure 6 The detection sequence of the three touch units shown can be as follows: TP signals are provided to SensorPad (n), SensorPad (n+1), and SensorPad (n+2) sequentially. Simultaneously, when providing a TP signal to SensorPad (n), COM signal 2 is provided to SensorPad (n+1) and SensorPad (n+2); when providing a TP signal to SensorPad (n+1), COM signal 2 is provided to SensorPad (n+2) and SensorPad (n); when providing a TP signal to SensorPad (n+2), COM signal 2 is provided to SensorPad (n) and SensorPad (n+1). Based on this, the first selection signal, the second selection signal, and the fifth selection signal transmitted by the fifth selection control line TP_MUXC1 are sequentially at active levels to provide TP signals to SensorPad (n), SensorPad (n+1), and SensorPad (n+2) sequentially. At the same time, when the second selection signal transmitted by the second selection control line TP_MUXB1 is at an active level, the first inverting transistor TB1 and the tenth inverting transistor TB3 are turned on, pulling the first selection transistor K11 and the seventh selection transistor K32 back to an inactive level (e.g., Figure 7 The timing sequence of the signal indicated by the dashed box 1 shown is as follows: Figure 7 The signal timing indicated by the dashed box 4 shown in the diagram prevents the TP signal from being mistakenly charged to the first touch unit and the COM signal from being mistakenly charged to the second touch unit. The same logic applies to other cases, which will not be elaborated upon here. The meanings of the other dashed boxes can be understood by referring to the diagram, and will not be elaborated upon here.

[0031] In some embodiments, the transistors in the first multiplexing unit, the third multiplexing unit, the first inverting control unit, and the third inverting control unit are N-type thin-film transistors of the same type. The N-type thin-film transistors also include thin-film transistors made of high-mobility oxide semiconductor materials; the high-mobility oxide semiconductor materials include indium gallium zinc oxide semiconductor materials, indium zinc oxide semiconductor materials, or indium gallium zinc tin oxide semiconductor materials.

[0032] It should be noted that the touch screen provided in this application embodiment is not limited to MUX1:2 and MUX1:3, but can also be applied to touch screens with higher segmentation such as MUX2:4, MUX2:6, and MUX1:4.

[0033] The touch screen provided in the embodiments of this application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A touch screen, characterized in that, include: Touch panel; The touch panel includes a plurality of touch units; each touch unit is used to detect changes in capacitance of the touch panel in response to a touch signal; Multiplexing circuit; The multiplexing circuit includes at least one first multiplexing unit, the first multiplexing unit including a first selection transistor and a second selection transistor, wherein; The source and drain of the first selection transistor are connected between a first signal input line for providing the touch signal and a first touch unit, and the control electrode of the first selection transistor is connected to a first selection control line; and the source and drain of the second selection transistor are connected between the first signal input line and a second touch unit, and the control electrode of the second selection transistor is connected to a second selection control line. as well as Error-proof charging circuit; the error-proof charging circuit includes a first inverting control unit corresponding to the first multiplexing unit, the first inverting control unit includes a first inverting control group and a second inverting control group; wherein, the first inverting control group includes a first inverting transistor, the second inverting control group includes a second inverting transistor, wherein; The source and drain of the first inverting transistor are connected between the second selection control line and the low-potential power supply line, and the control electrode of the first inverting transistor is connected to the first selection control line; and the source and drain of the second inverting transistor are connected between the first selection control line and the low-potential power supply line, and the control electrode of the second inverting transistor is connected to the second selection control line. The first multiplexing unit is configured to, in response to the first selection signal transmitted by the first selection control line and the second selection signal transmitted by the second selection control line being sequentially at an active level, turn on the first selection transistor and the second selection transistor respectively, so as to connect the electrical connection between the first signal input line and the first touch unit and the second touch unit in a time-division manner, so as to provide the touch signal to the first touch unit and the second touch unit respectively; and the first inverting control unit is configured to, in response to the first selection signal being at an active level, turn on the second inverting transistor, so as to pull the level of the control electrode of the second selection transistor back to or maintain it at an inactive level using the low-potential power signal transmitted by the low-potential power line; and in response to the second selection signal being at an active level, turn on the first inverting transistor, so as to pull the level of the control electrode of the first selection transistor back to or maintain it at an inactive level using the low-potential power signal.

2. The touch screen according to claim 1, characterized in that, While one touch unit receives the touch signal, other touch units connected to the same first signal input line simultaneously receive the first reference electrical signal. The multiplexing circuit further includes a second multiplexing unit corresponding to each of the first multiplexing units, the second multiplexing unit including a third selection transistor and a fourth selection transistor; wherein... The source and drain of the third selection transistor are connected between the second signal input line providing the first reference electrical signal and the first touch unit, and the control electrode of the third selection transistor is connected to the third selection control line; and the source and drain of the fourth selection transistor are connected between the second signal input line and the second touch unit, and the control electrode of the fourth selection transistor is connected to the fourth selection control line. The error-proof charging circuit further includes a second inverting control unit corresponding to the second multiplexing unit, the second inverting control unit including a third inverting control group; the third inverting control group includes: a third inverting transistor and a fourth inverting transistor; wherein... The source and drain of the third inverting transistor are connected between the third selection control line and the low-potential power supply line, and the control electrode of the third inverting transistor is connected to the fourth selection control line; and the source and drain of the fourth inverting transistor are connected between the fourth selection control line and the low-potential power supply line, and the control electrode of the fourth inverting transistor is connected to the third selection control line. Wherein, the first selection signal and the fourth selection signal transmitted by the fourth selection control line are both at an active level; the second selection signal and the third selection signal transmitted by the third selection control line are both at an active level.

3. The touch screen according to claim 1, characterized in that, The first multiplexing unit further includes a fifth selection transistor, the source and drain of which are connected between the first signal input line and the third touch unit, and the control electrode of which is connected to the fifth selection control line. The first inverting control group further includes a fifth inverting transistor, the source and drain of which are connected between the fifth selection control line and the low-potential power supply line, and the control electrode of which is connected to the first selection control line. The second inverting control group further includes a sixth inverting transistor, the source and drain of which are connected between the fifth selection control line and the low-potential power supply line, and the control electrode of which is connected to the second selection control line. The first inverting control unit further includes a fourth inverting control group; the fourth inverting control group includes a seventh inverting transistor and an eighth inverting transistor, wherein the source and drain of the seventh inverting transistor are connected between the first selection control line and the low-potential power supply line, and the control electrode of the seventh inverting transistor is connected to the fifth selection control line; and the source and drain of the eighth inverting transistor are connected between the second selection control line and the low-potential power supply line, and the control electrode of the eighth inverting transistor is connected to the fifth selection control line.

4. The touch screen according to claim 3, characterized in that, While one touch unit receives the touch signal, other touch units connected to the same first signal input line simultaneously receive the second reference electrical signal. The multiplexing circuit further includes a third multiplexing unit corresponding to each of the first multiplexing units; the third multiplexing unit includes a sixth selection transistor, a seventh selection transistor, and an eighth selection transistor, wherein: the source and drain of the sixth selection transistor are connected between the third signal input line providing the second reference electrical signal and the first touch unit, and the control electrode of the sixth selection transistor is connected to a sixth selection control line; the source and drain of the seventh selection transistor are connected between the third signal input line and the second touch unit, and the control electrode of the seventh selection transistor is connected to a seventh selection control line; and the source and drain of the eighth selection transistor are connected between the third signal input line and the third touch unit, and the control electrode of the eighth selection transistor is connected to an eighth selection control line; The error-proof charging circuit further includes a third inverting control unit corresponding to the third multiplexing unit; the third inverting control unit includes: a ninth inverting transistor, a tenth inverting transistor, and an eleventh inverting transistor, wherein: the source and drain of the ninth inverting transistor are connected between the sixth selection control line and the low-potential power supply line, and the control electrode of the ninth inverting transistor is connected to the first selection control line; the source and drain of the tenth inverting transistor are connected between the seventh selection control line and the low-potential power supply line, and the control electrode of the tenth inverting transistor is connected to the second selection control line; and the source and drain of the eleventh inverting transistor are connected between the eighth selection control line and the low-potential power supply line, and the control electrode of the eleventh inverting transistor is connected to the fifth selection control line; Specifically, the first selection signal, the seventh selection signal transmitted by the seventh selection control line, and the eighth selection signal transmitted by the eighth selection control line are all at an active level; the second selection signal, the sixth selection signal transmitted by the sixth selection control line, and the eighth selection signal are all at an active level; and the fifth selection signal transmitted by the fifth selection control line, the sixth selection signal, and the seventh selection signal are all at an active level.

5. The touch screen according to claim 2, characterized in that, The transistors in the first multiplexing unit, the second multiplexing unit, the first inverting control unit, and the second inverting control unit are of the same type.

6. The touch screen according to claim 5, characterized in that, The transistors in the first multiplexing unit, the second multiplexing unit, the first inverting control unit, and the second inverting control unit are N-type thin-film transistors; the N-type thin-film transistors include thin-film transistors made of high-mobility oxide semiconductor materials; the high-mobility oxide semiconductor materials include indium gallium zinc oxide semiconductor materials, indium zinc oxide semiconductor materials, or indium gallium zinc tin oxide semiconductor materials.

7. The touch screen according to claim 6, characterized in that, The effective level is a first level, and the invalid level is a second level, wherein the first level is greater than the second level; the low-potential power supply signal is a DC signal at the second level.

8. The touch screen according to claim 4, characterized in that, The transistors in the first multiplexing unit, the third multiplexing unit, the first inverting control unit, and the third inverting control unit are all N-type thin-film transistors.

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