Display port circuit with high-voltage protection function and display

Abstract

The utility model is applicable to the technical field of displays, and provides a display port circuit with a high-voltage protection function and a display, the port circuit comprises a voltage source input end, a signal source input end, a voltage turn-off module, a signal turn-off module, a signal processing module, a voltage processing module and a sampling control module, and the sampling control module is used for carrying out voltage and / or current sampling on the input of the voltage source input end and the signal source input end, and controlling the voltage turn-off module and the signal turn-off module to turn off the power supply voltage input and the signal source input at the same time when high-voltage input at any end is detected. According to the integrated instantaneous high-voltage-resistant protection scheme for the display device, high-voltage-resistant protection of an I / O port of the display device and high-voltage-resistant protection of a power port are integrated, so that all voltage paths and data paths input to the display device have peak value protection capability; and more comprehensive overvoltage and current protection can be provided for the display equipment.

Description

Technical Field

[0001] The utility model belongs to the technical field of displays, and in particular relates to a display port circuit and a display with a high-voltage protection function. Background Art

[0002] The power supply circuit of the LCD generally adopts a switching circuit to convert the AC 220V input voltage into a DC voltage through a rectifier and filter circuit, and then the switch tube chops and the high-frequency transformer steps down the voltage to obtain a high-frequency rectangular wave voltage, and finally outputs the DC voltage required by each module of the LCD after rectification and filtering. The display device may be affected by high voltage caused by lightning strikes or short circuits during use.

[0003] Most existing high-voltage protection circuits are integrated on power boards and are often located at the front end of the input of electrical equipment. They are used to provide timely protection when a surge occurs, such as cutting off the circuit or absorbing transient voltage and current, or embedding transient voltage to absorb high-voltage energy.

[0004] However, since the existing display power input path and signal input path are often relatively independent, when a lightning strike occurs and one of the paths is affected by instantaneous high voltage, the other path is easily affected by a secondary high voltage lightning strike due to the lack of shielding, causing damage to the equipment. Utility Model Content

[0005] The purpose of the embodiments of the present application is to provide a display port circuit with a high-voltage protection function, aiming to solve the problem that the existing display power input path and signal input path are often relatively independent. When a lightning strike occurs and one of the paths is affected by instantaneous high voltage, the other path is easily affected by a secondary high-voltage lightning strike due to the lack of shielding action, causing damage to the equipment.

[0006] The embodiment of the present application is implemented as follows: a display port circuit with a high voltage protection function, the display port circuit comprising:

[0007] A voltage source input terminal, a signal source input terminal, a voltage shutdown module, a signal shutdown module, a signal processing module, a voltage processing module and a sampling control module;

[0008] The voltage source input terminal is used to input the power supply voltage, and the signal source input terminal is used to input the data signal; the voltage processing module is used for voltage transformation; and the data processing module is used for decoding the data signal;

[0009] The voltage shutoff module is arranged between the voltage source input terminal and the voltage processing module, and is used to control the on and off of the power supply voltage source;

[0010] The signal shutoff module is arranged between the signal source input terminal and the signal processing module, and is used to control the on and off of the data signal;

[0011] The sampling control module is used to perform voltage and / or current sampling on the inputs of the voltage source input terminal and the signal source input terminal, and when a high voltage input is detected at either terminal, the voltage shutdown module and the signal shutdown module are controlled to simultaneously shut down the power supply voltage input and the signal source input.

[0012] Preferably, the sampling control module includes a plurality of voltage source overvoltage collection terminals and a signal source overvoltage collection terminal, which are respectively used to collect the input voltage values ​​of the voltage source input terminal and the signal source input terminal; the voltage source overvoltage collection terminal is also provided with a voltage divider unit, which is used to divide and reduce the sampling voltage value input into the sampling control module by the voltage source overvoltage collection terminal.

[0013] Preferably, the sampling control module includes a voltage detection unit, a detection diode and a switch tube;

[0014] The detection diode is used to be turned on when a lightning overvoltage occurs; the voltage detection unit is used to detect the peak voltage value of the detection diode when a lightning overvoltage occurs, and control the switch tube to be turned off when the peak voltage value is higher than a threshold.

[0015] Preferably, a delay unit is provided in the sampling control module;

[0016] The delay unit is used to wait for a preset delay time after receiving a high voltage input, and after the delay time ends, control the voltage shutdown module and the signal shutdown module to simultaneously turn on the power supply voltage input and the signal source input.

[0017] Preferably, the display port circuit further comprises an optical coupling module;

[0018] The optical coupling module is arranged between the signal source input end and the signal shutoff module, and is used to form optical coupling isolation between the signal source input end and the signal shutoff module.

[0019] Preferably, the voltage source overvoltage collection terminal and the signal source overvoltage collection terminal are connected to each other, so that the collected overvoltage signals are aggregated and input into the detection control unit through a unified input path for overvoltage detection.

[0020] Preferably, the voltage detection unit at least includes:

[0021] The detection terminal V0 and the detection terminal V1, the resistor R5 and the capacitor C1 are connected in parallel between the monitoring terminals V1 and V2, the detection terminal V0 is connected to one end of the resistor R3, the other end of the resistor R3 is connected to the positive electrode of the diode D1, the negative electrode of the diode D1 is connected to the power supply Vcc, the positive electrode of the diode D1 is also connected to the standard positive voltage +Vref, the negative electrode of the diode D3 is connected to the positive electrode of the diode D1, the negative electrode of the diode D3 is also connected to the positive input terminal of the voltage comparator S1, the positive electrode of the diode D3 is connected to the negative input terminal of the voltage comparator S1, the output terminal of the voltage comparator S1 is connected to the negative electrode of the diode D2, and the positive electrode of the diode D2 is connected to the gate of the MOS tube, The detection terminal V1 is connected to the first end of the resistor R7, the second end of the resistor R7 is connected to the positive input end of the second voltage comparator, the second end of the resistor R7 is also connected to the first end of the resistor R8, the second end of the resistor R8 is connected to the output end of the second voltage comparator, the detection terminal V2 is also connected to the negative input end of the second voltage comparator, the negative input end of the voltage comparator is connected to the positive electrode of the diode D4, the negative electrode of the diode D4 is connected to the fourth end of the second voltage comparator, the output end of the second voltage comparator is connected to the negative electrode of the diode D6, the positive electrode of the diode D6 is connected to the MOS tube, the MOS tube is connected to the voltage shutdown module and the signal shutdown module, and is used to control their shutdown and conduction conditions.

[0022] Another object of an embodiment of the present application is to provide a display, which includes a display module and a display unit control board, wherein the display unit control board is connected to the display port circuit as described above, the display unit control board is used to control the display of the display module, and the display port circuit is used to provide power and data input to the display unit control board.

[0023] The display port circuit with high-voltage protection function provided in the embodiment of the present application provides an integrated anti-instantaneous high-voltage protection solution for display devices, which integrates the anti-high-voltage protection for the data I / O port of the display device with the anti-high-voltage protection for the power port, so that all voltage paths and data paths input to the display have peak protection capabilities. When any port receives a high-voltage impact, all ports are closed for high-voltage protection, thereby avoiding possible damage to the internal equipment caused by secondary lightning strikes. The protection performance is stronger and more suitable for use in areas prone to lightning strikes, providing more comprehensive overvoltage protection for display devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of module connection of a display port circuit with a high voltage protection function provided in an embodiment of the present application;

[0025] Figure 2 A circuit diagram of a sampling control module provided in an embodiment of the present application;

[0026] Figure 3 A schematic diagram of module connections of another display port circuit with a high voltage protection function provided in an embodiment of the present application. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0028] As used herein, "coupled" or "connected" may refer to two or more elements making direct physical or electrical contact with each other, or making indirect physical or electrical contact with each other, or may refer to two or more elements operating or acting on each other. The term "circuit" generally refers to an object composed of one or more transistors and / or one or more active and passive components connected in a certain manner to process signals.

[0029] However, those skilled in the art will appreciate that the same element may be referred to by different names. This application does not distinguish elements by name, but by functional differences.

[0030] In addition, the embodiments of the present application include features of multiple specific embodiments and method steps and their sequences for constructing and operating these specific embodiments. However, other specific embodiments may also be used to achieve the same or equivalent functions and step sequences. Unless otherwise defined in this specification, the meanings of scientific and technical terms used herein are the same as those understood and used by technicians in the field to which this application belongs. In addition, singular nouns used in this specification include plural forms of the nouns, and plural nouns used also include singular forms of the nouns, unless otherwise conflicting with the context.

[0031] The specific implementation of the present application is described in detail below in conjunction with specific embodiments.

[0032] like Figure 1 FIG. 1 is a schematic diagram of module connection of a display port circuit with a high voltage protection function provided by an embodiment of the present application; including:

[0033] A voltage source input terminal, a signal source input terminal, a voltage shutdown module, a signal shutdown module, a signal processing module, a voltage processing module and a sampling control module;

[0034] The voltage source input terminal is used to input the power supply voltage, and the signal source input terminal is used to input the data signal; the voltage processing module is used for voltage transformation; and the data processing module is used for decoding the data signal;

[0035] The voltage shutoff module is arranged between the voltage source input terminal and the voltage processing module, and is used to control the on and off of the power supply voltage source;

[0036] The signal shutoff module is arranged between the signal source input terminal and the signal processing module, and is used to control the on and off of the data signal;

[0037] The sampling control module is used to perform voltage and / or current sampling on the inputs of the voltage source input terminal and the signal source input terminal, and when a high voltage input is detected at either terminal, the voltage shutdown module and the signal shutdown module are controlled to simultaneously shut down the power supply voltage input and the signal source input.

[0038] In an embodiment of the present application, the signal shutdown module and the voltage shutdown module are in an on state during normal operation. When a lightning strike occurs, the sampling control module detects the occurrence of overvoltage through the detection end, and then controls the voltage shutdown module and the signal shutdown module to simultaneously or sequentially shut down the power supply voltage input and the signal source input to achieve protection for the circuit.

[0039] The display port circuit with high-voltage protection function provided in the embodiment of the present application provides an integrated anti-instantaneous high-voltage protection solution for display devices, which integrates the anti-high-voltage protection for the data I / O port of the display device with the anti-high-voltage protection for the power port, so that all voltage paths and data paths input to the display have peak protection capabilities. When any port receives a high-voltage impact, all ports are closed for high-voltage protection, thereby avoiding possible damage to the internal equipment caused by secondary lightning strikes. The protection performance is stronger and more suitable for use in areas prone to lightning strikes, providing more comprehensive overvoltage protection for display devices.

[0040] As a preferred embodiment of the present application, the sampling control module includes a plurality of voltage source overvoltage collection terminals and signal source overvoltage collection terminals, which are respectively used to collect the input voltage values ​​of the voltage source input terminal and the signal source input terminal. The voltage source overvoltage collection terminal is also provided with a voltage divider unit, which is used to divide and reduce the sampling voltage value input into the sampling control module by the voltage source overvoltage collection terminal.

[0041] In the embodiment of the present application, since a communication chip is used in the signal input and output ends, a number of serial or parallel interfaces are provided, and a signal source overvoltage collection end can be provided on each of these interfaces. At the same time, a voltage source overvoltage collection end can also be provided on each pole of the voltage source input end, thereby performing overvoltage or overcurrent signal collection on all input ends.

[0042] As another preferred embodiment of the present application, the sampling control module includes a voltage detection unit, a detection diode and a switch tube;

[0043] The detection diode is used to be turned on when a lightning overvoltage occurs; the voltage detection unit is used to detect the peak voltage value of the detection diode when a lightning overvoltage occurs, and control the switch tube to be turned off when the peak voltage value is higher than a threshold.

[0044] In the embodiment of the present application, diodes may be used to divide and detect overvoltage.

[0045] As another preferred embodiment of the present application, a delay unit is provided in the sampling control module;

[0046] The delay unit is used to wait for a preset delay time after receiving a high voltage input, and after the delay time ends, control the voltage shutdown module and the signal shutdown module to simultaneously turn on the power supply voltage input and the signal source input.

[0047] In the embodiment of the present application, the delay unit can be preset with a buffer time. When the high voltage occurs for a period of time, the sampling control unit automatically controls the voltage cutoff module and the signal cutoff module to be turned on, so that the voltage source and the signal source of the device are turned on, and the device automatically starts to work, and there is no need to manually control the restart of the device after the lightning strike ends. Preferably, the delay unit can use a quartz oscillation timer to preset the buffer time.

[0048] As another preferred embodiment of the present application, the voltage source overvoltage collection end and the signal source overvoltage collection end are connected to each other so that the collected overvoltage signals are aggregated and input into the detection control unit through a unified input path for overvoltage detection.

[0049] In the embodiment of the present application, each acquisition end may be provided with more components, for example, shielding diodes are provided respectively to avoid mutual influence or oscillation, which will not be listed in detail here.

[0050] like Figure 2 As shown, as another preferred embodiment of the present application, the voltage detection unit at least includes:

[0051] The detection terminal V0 and the detection terminal V1, the resistor R5 and the capacitor C1 are connected in parallel between the monitoring terminals V1 and V2, the detection terminal V0 is connected to one end of the resistor R3, the other end of the resistor R3 is connected to the positive electrode of the diode D1, the negative electrode of the diode D1 is connected to the power supply Vcc, the positive electrode of the diode D1 is also connected to the standard positive voltage +Vref, the negative electrode of the diode D3 is connected to the positive electrode of the diode D1, the negative electrode of the diode D3 is also connected to the positive input terminal of the voltage comparator S1, the positive electrode of the diode D3 is connected to the negative input terminal of the voltage comparator S1, the output terminal of the voltage comparator S1 is connected to the negative electrode of the diode D2, and the positive electrode of the diode D2 is connected to the gate of the MOS tube, The detection terminal V1 is connected to the first end of the resistor R7, the second end of the resistor R7 is connected to the positive input end of the second voltage comparator, the second end of the resistor R7 is also connected to the first end of the resistor R8, the second end of the resistor R8 is connected to the output end of the second voltage comparator, the detection terminal V2 is also connected to the negative input end of the second voltage comparator, the negative input end of the voltage comparator is connected to the positive electrode of the diode D4, the negative electrode of the diode D4 is connected to the fourth end of the second voltage comparator, the output end of the second voltage comparator is connected to the negative electrode of the diode D6, the positive electrode of the diode D6 is connected to the MOS tube, the MOS tube is connected to the voltage shutdown module and the signal shutdown module, and is used to control their shutdown and conduction conditions.

[0052] In the embodiment of the present application, the collected voltage signal is compared with the standard voltage or threshold voltage through a comparator through a voltage comparator, and then it is determined whether a signal needs to be sent to control the shutdown component to shut down. The voltage shutdown module and the signal shutdown module can be a transistor or a similar unit or device that can control the signal to be turned on or off, and no specific restrictions are made here. Those skilled in the art will know that this module may contain more or fewer components, and the specific connection method can be seen in Figure 2 , no specific limitation is given here.

[0053] like Figure 3 As shown, as another preferred embodiment of the present application, the display port circuit also includes an optical coupling module; the optical coupling module is arranged between the signal source input terminal and the signal shutdown module, and is used to form an optical coupling isolation between the signal source input terminal and the signal shutdown module.

[0054] In the embodiment of the present application, in order to improve the protection effect of overvoltage or overcurrent, the signal input can be shielded by a high-speed optical coupler to isolate the inside and the outside.

[0055] As another preferred embodiment of the present application, a display is also provided, which includes a display module and a display unit control board, the display unit control board is connected to the display port circuit as described above, the display unit control board is used to control the display of the display module, and the display port circuit is used to provide power and data input to the display unit control board.

[0056] In the embodiment of the present application, the description of the display port circuit is as described above and will not be repeated here.

[0057] The display provided in the embodiment of the present application provides an integrated anti-instantaneous high voltage protection solution for the display device by setting a display port circuit with a high-voltage protection function, integrating the anti-high voltage protection for the data I / O port of the display device with the anti-high voltage protection for the power port, so that all voltage paths and data paths input to the display have peak protection capabilities. When any port receives a high-voltage impact, all ports are closed for high-voltage protection, thereby avoiding possible damage to the internal equipment caused by secondary lightning strikes. The protection performance is stronger, and it is more suitable for use in areas prone to lightning strikes, providing more comprehensive overvoltage protection for display devices.

[0058] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, a first end may be referred to as a second end, and similarly, a second resistor may be referred to as a first resistor and a second end may be referred to as a first end. Both the first resistor and the second resistor are resistors, but they are not the same resistor. The first end and the second end represent that the element has at least two different terminals.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A display port circuit with high voltage protection function, characterized in that: The display port circuit comprises: A voltage source input terminal, a signal source input terminal, a voltage shutdown module, a signal shutdown module, a signal processing module, a voltage processing module, a data processing module and a sampling control module; The voltage source input terminal is used to input the power supply voltage, and the signal source input terminal is used to input the data signal; the voltage processing module is used for voltage transformation; and the data processing module is used for decoding the data signal; The voltage shutoff module is arranged between the voltage source input terminal and the voltage processing module, and is used to control the on and off of the power supply voltage source; The signal shutoff module is arranged between the signal source input terminal and the signal processing module, and is used to control the on and off of the data signal; The sampling control module is used to perform voltage and / or current sampling on the inputs of the voltage source input terminal and the signal source input terminal, and when a high voltage input is detected at either terminal, the voltage shutdown module and the signal shutdown module are controlled to simultaneously shut down the power supply voltage input and the signal source input.

2. The display port circuit according to claim 1, characterized in that The sampling control module includes a plurality of voltage source overvoltage collection terminals and a signal source overvoltage collection terminal, which are respectively used to collect the input voltage values ​​of the voltage source input terminal and the signal source input terminal. The voltage source overvoltage collection terminal is also provided with a voltage dividing unit, which is used to divide and reduce the sampling voltage value input into the sampling control module by the voltage source overvoltage collection terminal.

3. The display port circuit according to claim 2, characterized in that The sampling control module includes a voltage detection unit, a detection diode and a switch tube; The detection diode is used to be turned on when a lightning overvoltage occurs; the voltage detection unit is used to detect the peak voltage value of the detection diode when a lightning overvoltage occurs, and control the switch tube to be turned off when the peak voltage value is higher than a threshold.

4. The display port circuit according to claim 1, characterized in that: A delay unit is provided in the sampling control module; The delay unit is used to wait for a preset delay time after receiving a high voltage input, and after the delay time ends, control the voltage shutdown module and the signal shutdown module to simultaneously turn on the power supply voltage input and the signal source input.

5. The display port circuit according to claim 1, characterized in that: The display port circuit also includes an optical coupling module; The optical coupling module is arranged between the signal source input end and the signal shutoff module, and is used to form optical coupling isolation between the signal source input end and the signal shutoff module.

6. The display port circuit according to claim 2, characterized in that: The voltage source overvoltage collection terminal and the signal source overvoltage collection terminal are connected to each other so that the collected overvoltage signals are aggregated and input into the sampling control module through a unified input path for overvoltage detection.

7. The display port circuit according to claim 3, characterized in that: The voltage detection unit at least comprises: A detection terminal V0 and a detection terminal V1, a resistor R5 and a capacitor C1 are connected in parallel between the detection terminal V1 and the detection terminal V0, the detection terminal V0 is connected to one end of the resistor R3, the other end of the resistor R3 is connected to the positive electrode of the diode D1, the negative electrode of the diode D1 is connected to the power supply Vcc, the positive electrode of the diode D1 is also connected to the standard positive voltage +Vref, the negative electrode of the diode D3 is connected to the positive electrode of the diode D1, the negative electrode of the diode D3 is also connected to the positive input end of the voltage comparator S1, the positive electrode of the diode D3 is connected to the negative input end of the voltage comparator S1, the output end of the voltage comparator S1 is connected to the negative electrode of the diode D2, the positive electrode of the diode D2 is connected to the gate of the MOS tube The detection terminal V1 is connected to the first end of the resistor R7, the second end of the resistor R7 is connected to the positive input end of the second voltage comparator, the second end of the resistor R7 is also connected to the first end of the resistor R8, the second end of the resistor R8 is connected to the output end of the second voltage comparator, the detection terminal V1 is also connected to the negative input end of the second voltage comparator, the negative input end of the voltage comparator is connected to the anode of the diode D4, the cathode of the diode D4 is connected to the fourth end of the second voltage comparator, the output end of the second voltage comparator is connected to the cathode of the diode D6, the anode of the diode D6 is connected to the MOS tube, the MOS tube is connected to the voltage shutdown module and the signal shutdown module, and is used to control the shutdown and conduction conditions thereof.

8. A display, characterized in that: The display includes a display module and a display unit control board, the display unit control board is connected to the display port circuit as described in any one of claims 1 to 7, the display unit control board is used to control the display of the display module, and the display port circuit is used to provide power and data input to the display unit control board.

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