Signal processing circuit and display

Abstract

The embodiment of the invention provides a signal processing circuit and a display. The signal processing circuit comprises a level conversion control module and an output control module, the output control module is used for outputting a high-level signal to a post-stage circuit and transmitting the high-level signal to the control end of the level conversion control module under the condition that the input end of the output control module is at a high level; wherein the signal source is used for outputting a high-level voltage signal; the level conversion control module is used for lowering the level of the input end of the output control module under the condition that the control end of the level conversion control module receives the high level signal; the output control module is also used for outputting a low-level signal to a post-stage circuit and transmitting the low-level signal to the control end of the level conversion control module under the condition that the input end of the output control module is at a low level; the level conversion control module is also used for being in a turn-off state under the condition that the control end of the level conversion control module receives a low level signal; wherein the high level signal and the low level signal form a pulse signal.

Description

Technical Field

[0001] The present application relates to the field of electronic technology, and in particular to a signal processing circuit and a display. Background Art

[0002] With the development of integration and intelligence in the display field, more and more TFT (Thin Film Transistor) sensor circuits are integrated in the display screen, such as In-cell (a method of embedding touch panel functions into liquid crystal pixels) touch sensor circuits, in-screen light sensor circuits, under-screen camera sensor circuits, etc. At present, external processors such as CPU (Central Processing Unit), MPU (Microprocessor Unit), MCU (Microcontroller Unit), etc. are usually used to receive analog signals from TFT sensor circuits, process the received analog signals, and convert them into pulse signals that can be recognized by themselves, such as Figure 1 As shown in the figure, since the processor needs to perform a lot of signal processing, the heat generated inside the processor increases accordingly, which may reduce the reliability of the processor. Summary of the invention

[0003] The purpose of the embodiments of the present application is to provide a signal processing circuit and a display to improve the reliability of the processor. The specific technical solution is as follows:

[0004] In a first aspect, an embodiment of the present application provides a signal processing circuit, the circuit comprising:

[0005] Level conversion control module and output control module;

[0006] The input end of the output control module is connected to the signal source and the output end of the level conversion control module respectively, and the output end of the output control module is connected to the subsequent circuit and the control end of the level conversion control module respectively;

[0007] The output control module is used to output a high-level signal to the subsequent circuit when its input terminal is at a high level, and transmit the high-level signal to the control terminal of the level conversion control module; wherein the signal source is used to output a high-level voltage signal;

[0008] The level conversion control module is used to pull down the level of the input end of the output control module when the control end thereof receives the high level signal;

[0009] The output control module is further used to output a low-level signal to the subsequent circuit when its input terminal is at a low level, and transmit the low-level signal to the control terminal of the level conversion control module;

[0010] The level conversion control module is further configured to be in a shutdown state when its control end receives the low level signal;

[0011] The high level signal and the low level signal form a pulse signal.

[0012] In a possible implementation, the circuit further includes: a charging and discharging module;

[0013] The charging and discharging module is respectively connected to the signal source, the level conversion control module, and the output control module;

[0014] The charging and discharging module is used to control the width of the high level signal of the pulse signal.

[0015] In a possible implementation, the circuit further includes: a detection module;

[0016] The input end of the detection module is respectively connected to the signal source, the output end of the level conversion control module, and the input end of the output control module, and the output end of the detection module is connected to the subsequent module;

[0017] The detection module is used to output a level signal opposite to the current level state of the input end of the output control module when the signal source is working normally, and continuously output a high level signal when the signal source is working abnormally, so that the subsequent module can judge the working state of the signal source according to the received level signal.

[0018] In a possible implementation manner, the output control module includes a first switch tube, a second switch tube, a third switch tube, and a fourth switch tube;

[0019] The control end of the first switch tube is respectively connected to the signal source, the output end of the level conversion control module, the input end of the output control module, and the control end of the second switch tube; the first end of the first switch tube is respectively connected to the first end of the third switch tube and the positive end of the first power supply; the second end of the first switch tube is respectively connected to the first end of the second switch tube, the control end of the third switch tube, and the control end of the fourth switch tube;

[0020] The second end of the second switch tube is grounded;

[0021] The second end of the third switch tube is respectively connected to the first end of the fourth switch tube, the output end of the output control module, and the control end of the level conversion control module;

[0022] The second end of the fourth switch tube is grounded.

[0023] In a possible implementation manner, the level conversion control module includes a fifth switch tube;

[0024] The control end of the fifth switch tube is respectively connected to the control end of the level conversion control module, the second end of the third switch tube, the first end of the fourth switch tube, and the output end of the output control module;

[0025] The first end of the fifth switch tube is respectively connected to the signal source, the output end of the level conversion control module, the input end of the output control module, the control end of the first switch tube, and the control end of the second switch tube;

[0026] The second end of the fifth switch tube is grounded.

[0027] In a possible implementation, the charging and discharging module includes a first capacitor;

[0028] The first end of the first capacitor is respectively connected to the signal source, the output end of the level conversion control module, and the input end of the output control module;

[0029] The second terminal of the first capacitor is grounded.

[0030] In a possible implementation manner, the detection module includes a sixth switch tube and a seventh switch tube;

[0031] The control end of the sixth switch tube is respectively connected to the signal source, the input end of the detection module, and the control end of the seventh switch tube, the first end of the sixth switch tube is connected to the positive end of the second power supply, and the second end of the sixth switch tube is respectively connected to the first end of the seventh switch tube and the output end of the detection module;

[0032] The second end of the seventh switch tube is grounded.

[0033] In a second aspect, an embodiment of the present application provides a display, comprising a signal source and a signal processing circuit as described in any one of the first aspects above.

[0034] In one possible implementation,

[0035] The signal source is a sensor circuit;

[0036] The sensing circuit and the signal processing circuit are integrated on a same printed circuit board of the display.

[0037] In one possible implementation,

[0038] The sensing circuit includes an eighth switch tube;

[0039] The control end of the eighth switch tube is connected to the positive end of the third power supply, the first end of the eighth switch tube is connected to the positive end of the fourth power supply, and the second end of the eighth switch tube is respectively connected to the input end of the output control module and the output end of the level conversion control module.

[0040] Beneficial effects of the embodiments of the present application:

[0041] A signal processing circuit and a display provided by an embodiment of the present application, the signal processing circuit includes: a level conversion control module and an output control module; the input end of the output control module is respectively connected to a signal source and an output end of the level conversion control module, and the output end of the output control module is respectively connected to a subsequent circuit and a control end of the level conversion control module; the output control module is used to output a high-level signal to the subsequent circuit when its own input end is at a high level, and transmit the high-level signal to the control end of the level conversion control module; wherein the signal source is used to output a high-level voltage signal; the level conversion control module is used to pull down the level of the input end of the output control module when its own control end receives a high-level signal; the output control module is also used to output a low-level signal to the subsequent circuit when its own input end is at a low level, and transmit the low-level signal to the control end of the level conversion control module; the level conversion control module is also used to be in a shutdown state when its own control end receives a low-level signal; wherein the high-level signal and the low-level signal constitute a pulse signal. The level of the input end of the output control module is lowered through the level conversion control module, so that the input end of the output control module alternates between high and low level states, and outputs a pulse signal of alternating high level signals and low level signals to the subsequent circuit (processor), that is, the voltage signal (analog signal) output by the signal source is converted into a pulse signal that can be recognized by the processor. The processor itself does not need to perform the conversion processing work from analog signals to pulse signals, which reduces the signal processing work of the processor, thereby reducing the heat generated inside the processor and improving the reliability of the processor.

[0042] Of course, implementing any product or method of the present application does not necessarily require achieving all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other embodiments can also be obtained based on these drawings.

[0044] Figure 1 A schematic diagram of a structure for processing analog signals of a TFT sensor circuit in the related art;

[0045] Figure 2 A first structural schematic diagram of a signal processing circuit provided in an embodiment of the present application;

[0046] Figure 3 A second structural schematic diagram of a signal processing circuit provided in an embodiment of the present application;

[0047] Figure 4 A third structural schematic diagram of the signal processing circuit provided in an embodiment of the present application;

[0048] Figure 5 A fourth structural schematic diagram of a signal processing circuit provided in an embodiment of the present application;

[0049] Figure 6 A fifth structural schematic diagram of the signal processing circuit provided in an embodiment of the present application;

[0050] Figure 7 A schematic diagram of a first structure of a display provided in an embodiment of the present application;

[0051] Figure 8 A second structural schematic diagram of the display provided in an embodiment of the present application. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field based on the present application belong to the scope of protection of the present application.

[0053] With the development of integration and intelligence in the display field, more and more TFT (Thin Film Transistor) sensor circuits are integrated in the display screen, such as In-cell (a method of embedding touch panel functions into liquid crystal pixels) touch sensor circuits, in-screen light sensor circuits, under-screen camera sensor circuits, etc. At present, external processors such as CPU (Central Processing Unit), MPU (Microprocessor Unit), MCU (Microcontroller Unit), etc. are usually used to receive analog signals from TFT sensor circuits, process the received analog signals, and convert them into pulse signals that can be recognized by themselves, such as Figure 1 As shown in the figure. Since the processor needs to perform a lot of signal processing, the heat generated inside the processor increases accordingly, which may reduce the reliability of the processor and reduce the signal processing efficiency of the processor, which may cause the system performance of the processor to decline.

[0054] In order to solve at least one of the above problems, the embodiment of the present application provides a signal processing circuit and a display. Next, the signal processing circuit 1 provided in the embodiment of the present application is described in detail. Figure 2 , is a first structural diagram of a signal processing circuit 1 provided in an embodiment of the present application, wherein the signal processing circuit 1 comprises:

[0055] A level conversion control module 11 and an output control module 12;

[0056] The input end of the output control module 12 is connected to the signal source and the output end of the level conversion control module 11 respectively, and the output end of the output control module 12 is connected to the subsequent circuit and the control end of the level conversion control module 11 respectively;

[0057] The output control module 12 is used to output a high-level signal to the subsequent circuit when its input terminal is at a high level, and transmit the high-level signal to the control terminal of the level conversion control module 11; wherein the signal source is used to output a high-level voltage signal;

[0058] The level conversion control module 11 is used to pull down the level of the input end of the output control module 12 when the control end thereof receives the high level signal;

[0059] The output control module 12 is further used to output a low-level signal to the subsequent circuit when its input terminal is at a low level, and transmit the low-level signal to the control terminal of the level conversion control module 11;

[0060] The level conversion control module 11 is also used to be in a shutdown state when its control end receives the low level signal;

[0061] The high level signal and the low level signal form a pulse signal.

[0062] The signal source may be a sensor circuit in a display screen, which is used to output a high-level voltage signal (analog signal). In one example, the signal source is an In-cell touch TFT sensor circuit in a display screen. After detecting a touch position, the In-cell touch TFT sensor circuit converts it into a voltage signal for output. When the touch TFT sensor circuit does not detect a touch position, it does not output.

[0063] When the signal source outputs a high-level voltage signal to the input end of the output control module 12, the output control module 12 outputs a high-level signal to the subsequent circuit (processor), and also feeds back the high-level signal to the control end of the level conversion control module 11, so that the level conversion control module 11 pulls down the level of the input end of the output control module 12. When the input end of the output control module 12 is at a low level, it will output a low-level signal to the subsequent circuit, and also feed back the low-level signal to the control end of the level conversion control module 11, and turn off the level conversion control module 11, so that the level state of the input end of the output control module 12 returns to a high level, and the output control module 12 outputs a high-level signal again, and the level conversion control module 11 pulls down again, and the output control module 12 outputs a low-level signal again... In this process, the output control module 12 outputs a pulse signal of alternating high-level signals and low-level signals to the subsequent circuit (processor).

[0064] In order to form the duration of the high level signal and the duration of the low level signal, a capacitor may be provided in the signal processing circuit 1 , and the charge and discharge characteristics of the capacitor are utilized to maintain the duration of the high level signal and the duration of the low level signal.

[0065] In the embodiment of the present application, the level of the input end of the output control module 12 is pulled down by the level conversion control module 11, so that the input end of the output control module 12 alternates between high and low level states, and outputs a pulse signal of alternating high level signals and low level signals to the subsequent circuit (processor), that is, the voltage signal (analog signal) output by the signal source is converted into a pulse signal that can be recognized by the processor, and the processor itself does not need to perform the conversion and processing work from the analog signal to the pulse signal, thereby reducing the signal processing work of the processor, thereby reducing the heat generated inside the processor, improving the reliability of the processor, and improving the signal processing efficiency of the processor, thereby improving the system performance of the processor; and the voltage signal output by the signal source is first converted into a pulse signal and then transmitted to the processor. Compared with transmitting the voltage signal directly to the processor, it can reduce the signal distortion problem (for a longer transmission path, the stability of the pulse signal is higher than that of the analog signal), and it can also reduce the demand for signal transmission and improve the speed and efficiency of signal transmission.

[0066] In one possible implementation, see Figure 3 , the signal processing circuit 1 further includes: a charging and discharging module 13;

[0067] The charging and discharging module 13 is respectively connected to the signal source, the level conversion control module 11, and the output control module 12;

[0068] The charging and discharging module 13 is used to control the width of the high level signal of the pulse signal.

[0069] By adjusting the parameter settings of the charge and discharge module 13 , the pulse width of the pulse signal (the width of the high-level signal) can be controlled so that the processor can identify different signals through different pulse frequencies.

[0070] In an example, the charge and discharge module 13 may include a capacitor, and the pulse width of the pulse signal may be adjusted by adjusting the capacitance of the capacitor.

[0071] In the embodiment of the present application, by setting the charge and discharge module 13 and adjusting the parameter settings of the charge and discharge module 13, the pulse width of the pulse signal can be controlled so that the processor can recognize different signals through different pulse frequencies.

[0072] In one possible implementation, see Figure 4 , the signal processing circuit 1 further includes: a detection module 14;

[0073] The input end of the detection module 14 is respectively connected to the signal source, the output end of the level conversion control module 11, and the input end of the output control module 12, and the output end of the detection module 14 is connected to the subsequent module;

[0074] The detection module 14 is used to output a level signal opposite to the current level state of the input end of the output control module 12 when the signal source is working normally, and continuously output a high level signal when the signal source is working abnormally, so that the subsequent module can judge the working state of the signal source according to the received level signal.

[0075] The specific working process of the detection module 14 will be described in detail later.

[0076] In the embodiment of the present application, the working state of the signal source can be judged according to the level signal output by the detection module 14. By setting the detection module 14, the working state of the signal source is monitored, which is convenient for engineers to take relevant measures to correct it when an abnormality occurs in the signal source, so as to ensure the normal operation of the signal source.

[0077] In one possible implementation, see Figure 5 , the output control module 12 includes a first switch tube M1, a second switch tube M2, a third switch tube M3, and a fourth switch tube M4;

[0078] The control end of the first switch tube M1 is respectively connected to the signal source, the output end of the level conversion control module 11, the input end of the output control module 12, and the control end of the second switch tube M2; the first end of the first switch tube M1 is respectively connected to the first end of the third switch tube M3 and the first power positive terminal VDD1; the second end of the first switch tube M1 is respectively connected to the first end of the second switch tube M2, the control end of the third switch tube M3, and the control end of the fourth switch tube M4;

[0079] The second end of the second switch tube M2 is grounded to GND;

[0080] The second end of the third switch tube M3 is respectively connected to the first end of the fourth switch tube M4, the output end of the output control module 12, and the control end of the level conversion control module 11;

[0081] A second terminal of the fourth switch tube M4 is grounded GND.

[0082] In one possible implementation, see Figure 5 , the level conversion control module 11 includes a fifth switch tube M5;

[0083] The control end of the fifth switch tube M5 is respectively connected to the control end of the level conversion control module 11, the second end of the third switch tube M3, the first end of the fourth switch tube M4, and the output end of the output control module 12;

[0084] The first end of the fifth switch tube M5 is respectively connected to the signal source, the output end of the level conversion control module 11, the input end of the output control module 12, the control end of the first switch tube M1, and the control end of the second switch tube M2;

[0085] A second end of the fifth switch tube M5 is grounded GND.

[0086] In one possible implementation, see Figure 5 , the charging and discharging module 13 includes a first capacitor C1;

[0087] The first end of the first capacitor C1 is connected to the signal source, the output end of the level conversion control module 11, and the input end of the output control module 12 respectively;

[0088] A second end of the first capacitor C1 is connected to the ground GND.

[0089] exist Figure 5 In the signal processing circuit 1 shown in the figure, the signal source is used to output a high-level voltage signal VIN, the first switch tube M1 is a P-type switch tube, the second switch tube M2 is an N-type switch tube, the third switch tube M3 is a P-type switch tube, the fourth switch tube M4 is an N-type switch tube, and the fifth switch tube M5 is an N-type switch tube. Figure 5 The working process of the signal processing circuit 1 shown is described in detail.

[0090] The signal source outputs a high-level voltage signal VIN to charge the first capacitor C1, the control end of the first switch tube M1 is high-level, the first switch tube M1 is turned off, the control end of the second switch tube M2 is high-level, the second switch tube M2 is turned on, the low level of the ground GND is transmitted to the N3 node, the control end of the fourth switch tube M4 is low-level, the fourth switch tube M4 is turned off, the control end of the third switch tube M3 is low-level, the third switch tube M3 is turned on, the high level of the first power supply positive terminal VDD1 is transmitted to the N4 node, and the output control module 12 outputs a high-level signal to the processor.

[0091] At the same time, the high-level signal output by the output control module 12 will be fed back to the control end of the fifth switch tube M5, and the fifth switch tube M5 will be turned on to pull down the level of the input end of the output control module 12. However, due to the existence of the first capacitor C1, the high level will last for a period of time before being pulled down to a low level. The larger the capacitance of the first capacitor C1, the longer the discharge time of the first capacitor C1. When the input end of the output control module 12 is pulled down to a low level, the control end of the second switch tube M2 is a low level, the second switch tube M2 is turned off, the control end of the first switch tube M1 is a low level, the first switch tube M1 is turned on, the high level of the first power supply positive terminal VDD1 is transmitted to the N3 node, the control end of the third switch tube M3 is a high level, the third switch tube M3 is turned off, the control end of the fourth switch tube M4 is a high level, the fourth switch tube M4 is turned on, the low level of the ground GND is transmitted to the N4 node, and the output control module 12 outputs a low-level signal to the processor.

[0092] At the same time, the low-level signal output by the output control module 12 will be fed back to the control end of the fifth switch tube M5, the fifth switch tube M5 is turned off, and the high-level voltage signal VIN output by the signal source charges the first capacitor C1, so that the input end of the output control module 12 returns to a high level (the low level will last for a period of time before returning to a high level. The larger the capacitance of the first capacitor C1, the longer the charging time of the first capacitor C1)... In this way, the output control module 12 outputs a pulse signal of alternating high-level signals and low-level signals to the processor.

[0093] In one possible implementation, see Figure 6 , the detection module 14 includes a sixth switch tube M6 and a seventh switch tube M7;

[0094] The control end of the sixth switch tube M6 is respectively connected to the signal source, the input end of the detection module 14, and the control end of the seventh switch tube M7; the first end of the sixth switch tube M6 is connected to the second power supply positive terminal VDD2; the second end of the sixth switch tube M6 is respectively connected to the first end of the seventh switch tube M7 and the output end of the detection module 14;

[0095] A second end of the seventh switch tube M7 is grounded GND.

[0096] exist Figure 6 In the signal processing circuit 1 shown in the figure, the sixth switch tube M6 is a P-type switch tube, and the seventh switch tube M7 is an N-type switch tube. Figure 6 The working process of the detection module 14 shown is described in detail.

[0097] When the signal source is in a normal working state, the level state of the input end of the output control module 12 is alternating between high and low levels. When the level of the input end of the output control module 12 is high, the control end of the sixth switch tube M6 is high, the sixth switch tube M6 is turned off, the control end of the seventh switch tube M7 is high, the seventh switch tube M7 is turned on, the low level of the ground GND is transmitted to the N5 node, and the detection module 14 outputs a low level to the subsequent module; when the level of the input end of the output control module 12 is low, the control end of the seventh switch tube M7 is low, the seventh switch tube M7 is turned off, the control end of the sixth switch tube M6 is low, the sixth switch tube M6 is turned on, the high level of the second power supply positive terminal VDD2 is transmitted to the N5 node, and the detection module 14 outputs a high level to the subsequent module. Therefore, when the signal source is in a normal working state, the detection module 14 outputs a level signal opposite to the current level state of the input end of the output control module 12.

[0098] When the signal source is in an abnormal working state, the signal source has no output or outputs a low-level signal, the seventh switch tube M7 is always turned off, the sixth switch tube M6 is always turned on, the high level of the second power supply positive terminal VDD2 is always transmitted to the N5 node, and the detection module 14 continues to output a high-level signal.

[0099] In summary, the post-stage module can determine the working status of the signal source according to the level signal output by the detection module 14, and monitor the working status of the signal source through the sixth switch tube M6 and the seventh switch tube M7, so that engineers can take relevant measures to correct the signal source when an abnormality occurs, so as to ensure the normal operation of the signal source.

[0100] The present application also provides a display 2, see Figure 7 The display 2 includes a signal source 21 and a signal processing circuit 1 as described in any one of the above embodiments.

[0101] In one possible implementation,

[0102] The signal source 21 is a sensor circuit;

[0103] The sensing circuit and the signal processing circuit 1 are integrated on the same printed circuit board of the display 2 .

[0104] The sensing circuit may be an in-cell touch sensing circuit, an in-screen light sensing circuit, an under-screen camera sensing circuit, etc. The above sensing circuits are all TFT sensing circuits integrated in the display screen. Integrating the signal processing circuit 1 and the sensing circuit on the same printed circuit board (PCB) can save PCB layout area and save costs.

[0105] In one possible implementation, see Figure 8 ,

[0106] The sensing circuit includes an eighth switch tube M8;

[0107] The control end of the eighth switch tube M8 is connected to the third power positive terminal VDD3, the first end of the eighth switch tube M8 is connected to the fourth power positive terminal VDD4, and the second end of the eighth switch tube M8 is respectively connected to the input end of the output control module 12 and the output end of the level conversion control module 11.

[0108] The eighth switch tube M8 is an N-type switch tube.

[0109] Understandably, Figure 8 The sensor circuit structure shown is only a schematic diagram and does not represent the actual sensor circuit structure.

[0110] It is understandable that for any switch tube in the circuit of the present application, the switch tube can be an N-type switch tube or a P-type switch tube, which can be selected according to the actual situation; the control end of the switch tube is the gate, the first end of the switch tube is the source or drain, and the second end of the switch tube is the drain or source corresponding to the first end. It is understandable that the switch tube can be a P-type switch tube or an N-type switch tube, which can be selected according to the actual situation, but the device coupling method of the circuit needs to be adjusted accordingly, and its replacement scheme is still within the protection scope of the present application.

[0111] It can be understood that the switch tube used in the circuit of the present application can be a MOS tube (Metal-Oxide-Semiconductor Field-Effect Transistor), or a TFT tube (Thin Film Transistor) or other types of switch tubes. The specific selection can be made according to the actual situation, and the replacement scheme is still within the protection scope of the present application.

[0112] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0113] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0114] The above description is only a preferred embodiment of the present application and is not intended to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims

1. A signal processing circuit, characterized in that: The circuit comprises: Level conversion control module and output control module; The input end of the output control module is connected to the signal source and the output end of the level conversion control module respectively, and the output end of the output control module is connected to the subsequent circuit and the control end of the level conversion control module respectively; The output control module is used to output a high-level signal to the subsequent circuit when its input terminal is at a high level, and transmit the high-level signal to the control terminal of the level conversion control module; wherein the signal source is used to output a high-level voltage signal; The level conversion control module is used to pull down the level of the input end of the output control module when the control end thereof receives the high level signal; The output control module is further used to output a low-level signal to the subsequent circuit when its input terminal is at a low level, and transmit the low-level signal to the control terminal of the level conversion control module; The level conversion control module is further configured to be in a shutdown state when its control end receives the low level signal; The high level signal and the low level signal form a pulse signal.

2. The circuit according to claim 1, characterized in that The circuit also includes: a charging and discharging module; The charging and discharging module is respectively connected to the signal source, the level conversion control module, and the output control module; The charging and discharging module is used to control the width of the high level signal of the pulse signal.

3. The circuit according to claim 1, characterized in that The circuit further comprises: a detection module; The input end of the detection module is respectively connected to the signal source, the output end of the level conversion control module, and the input end of the output control module, and the output end of the detection module is connected to the subsequent module; The detection module is used to output a level signal opposite to the current level state of the input end of the output control module when the signal source is working normally, and continuously output a high level signal when the signal source is working abnormally, so that the subsequent module can judge the working state of the signal source according to the received level signal.

4. The circuit according to claim 1, characterized in that The output control module includes a first switch tube, a second switch tube, a third switch tube, and a fourth switch tube; The control end of the first switch tube is respectively connected to the signal source, the output end of the level conversion control module, the input end of the output control module, and the control end of the second switch tube; the first end of the first switch tube is respectively connected to the first end of the third switch tube and the positive end of the first power supply; the second end of the first switch tube is respectively connected to the first end of the second switch tube, the control end of the third switch tube, and the control end of the fourth switch tube; The second end of the second switch tube is grounded; The second end of the third switch tube is respectively connected to the first end of the fourth switch tube, the output end of the output control module, and the control end of the level conversion control module; The second end of the fourth switch tube is grounded.

5. The circuit according to claim 4, characterized in that The level conversion control module includes a fifth switch tube; The control end of the fifth switch tube is respectively connected to the control end of the level conversion control module, the second end of the third switch tube, the first end of the fourth switch tube, and the output end of the output control module; The first end of the fifth switch tube is respectively connected to the signal source, the output end of the level conversion control module, the input end of the output control module, the control end of the first switch tube, and the control end of the second switch tube; The second end of the fifth switch tube is grounded.

6. The circuit according to claim 2, characterized in that The charging and discharging module includes a first capacitor; The first end of the first capacitor is respectively connected to the signal source, the output end of the level conversion control module, and the input end of the output control module; The second terminal of the first capacitor is grounded.

7. The circuit according to claim 3, characterized in that The detection module includes a sixth switch tube and a seventh switch tube; The control end of the sixth switch tube is respectively connected to the signal source, the input end of the detection module, and the control end of the seventh switch tube, the first end of the sixth switch tube is connected to the positive end of the second power supply, and the second end of the sixth switch tube is respectively connected to the first end of the seventh switch tube and the output end of the detection module; The second end of the seventh switch tube is grounded.

8. A display, characterized in that: The display comprises a signal source and a signal processing circuit as described in any one of claims 1 to 7.

9. The display according to claim 8, characterized in that The signal source is a sensor circuit; The sensing circuit and the signal processing circuit are integrated on a same printed circuit board of the display.

10. The display according to claim 9, characterized in that: The sensing circuit includes an eighth switch tube; The control end of the eighth switch tube is connected to the positive end of the third power supply, the first end of the eighth switch tube is connected to the positive end of the fourth power supply, and the second end of the eighth switch tube is respectively connected to the input end of the output control module and the output end of the level conversion control module.

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