WO2020220525A1 - Overcurrent protection circuit and method, and display device - Google Patents

Abstract

Disclosed are an overcurrent protection circuit (100) and method, and a display apparatus (1000). The circuit comprises: a panel (10), wherein a first output end (201) of a logic board (20) is connected to a first input end (101) of the panel (10); an input end (301) of a level shifter (30) is connected to a second output end (202) of the logic board (20); a first output end (302) of the level shifter (30) is connected to a second input end (102) of the panel (10); a second output end (303) of the level shifter (30) is connected to the logic board (20); and if the value of an actual current flowing through the level shifter (30) is greater than a threshold current value, the level shifter (30) sends a level signal to the logic board (20), and the logic board (20) interrupts, after receiving the level signal, an output signal from the first output end (201).

Description

Overcurrent protection circuit, method and display device Technical field

This application relates to the field of charging technology, and in particular to an overcurrent protection circuit, method and display device.

Background technique

The basic concept of the array substrate row drive technology (GateDriveronArray, GOA) circuit is to combine the thin film transistor liquid crystal display The gate drive circuit of the thinfilmtransistor-liquidcrystal display (TFT-LCD) panel (liquid crystal panel for short) is integrated on the glass substrate to form a scanning drive for the liquid crystal panel.

In the prior art, GOA products mainly use level shifter ICs for overcurrent protection. In the actual project operation, the resistance needs to be deduced based on the measured threshold current of the overcurrent protection circuit (OCP) with automatic input compensation. The value of the resistance value is based on the measurement of the existing product data, and the current value of each pass needs to be reversed against the existing OCP resistance to ground and the corresponding protection current look-up table. Waste resources and manpower.

Therefore, the existing technology has shortcomings and is in urgent need of improvement.

technical problem

The embodiments of the present application provide an overcurrent protection circuit, method, and display device, which can avoid manual meter checking and reduce the waste of resources and manpower.

Technical solutions

In the first aspect, an embodiment of the present application provides an overcurrent protection circuit, and the overcurrent protection circuit includes:

panel;

A logic board, the first output terminal of the logic board is connected to the first input terminal of the panel;

A level shifter, the input end of the level shifter is connected to the second output end of the logic board, and the first output end of the level shifter is connected to the second input end of the panel; wherein,

The second output terminal of the level shifter is connected to the logic board, and is used for when the logic board sends an electrical signal to the level shifter through the second output terminal, if the level shifter If the actual current value flowing inside is greater than the threshold current value, the level converter sends a level signal to the logic board through the second output terminal, and the logic board is interrupted after receiving the level signal The output signal of the first output terminal.

In the overcurrent protection circuit described in the present application, the level converter includes: a digital selector and a plurality of resistors, and a switch of the digital selector is connected to one or more of the plurality of resistors.

In the overcurrent protection circuit described in the present application, the level converter further includes: a control unit whose output terminal is connected to the input terminal of the digital selector for controlling the digital selector A switch is connected to one or more of the plurality of resistors to adjust the threshold current value of the overcurrent protection circuit.

In the overcurrent protection circuit described in this application, at least one end of the plurality of resistors is grounded.

In the overcurrent protection circuit described in the present application, the level shifter further includes a comparison feedback unit, and an input terminal of the comparison feedback unit is connected to an output terminal of the digital selector.

In the overcurrent protection circuit described in the present application, the resistance of each of the plurality of resistors is different.

In the overcurrent protection circuit described in the present application, the level signal is sent by a filtered stable voltage.

In a second aspect, the present application also provides an overcurrent protection method, which is applied to an overcurrent protection circuit including a level converter, a logic board, and a panel, and includes:

Pre-set threshold current value;

Receive electrical signals sent by the logic board;

Determine whether the actual current value carried by the electrical signal is greater than the threshold current value;

If yes, send a level signal to the logic board;

When the logic board receives the level signal, it interrupts the connection with the panel.

In the overcurrent protection method described in this application, the step of presetting the threshold current value includes:

The digital selector inside the level shifter is connected in advance to one or more of the multiple resistors inside the level shifter to determine the threshold current value.

In a third aspect, the present application also provides a display device, including an overcurrent protection circuit and a housing, the overcurrent protection circuit is disposed on the housing, and the overcurrent protection circuit includes:

panel;

A logic board, the first output terminal of the logic board is connected to the first input terminal of the panel;

A level shifter, the input end of the level shifter is connected to the second output end of the logic board, and the first output end of the level shifter is connected to the second input end of the panel; wherein,

The second output terminal of the level shifter is connected to the logic board, and is used for when the logic board sends an electrical signal to the level shifter through the second output terminal, if the level shifter If the actual current value flowing inside is greater than the threshold current value, the level converter sends a level signal to the logic board through the second output terminal, and the logic board is interrupted after receiving the level signal The output signal of the first output terminal.

In the display device of the present application, the level converter includes: a digital selector and a plurality of resistors, and a switch of the digital selector is connected to one or more of the plurality of resistors.

In the display device of the present application, the level converter further includes: a control unit, the output terminal of the control unit is connected to the input terminal of the digital selector for controlling the switch connection of the digital selector One or more of the multiple resistors are used to adjust the threshold current value of the overcurrent protection circuit.

In the display device described in the present application, at least one end of the plurality of resistors is grounded.

In the display device of the present application, the level converter further includes a comparison feedback unit, and an input end of the comparison feedback unit is connected to an output end of the digital selector.

In the display device described in the present application, the resistance value of each of the plurality of resistors is different.

In the display device described in the present application, the level signal is issued by a filtered stable voltage.

In the display device of the present application, the level converter includes: a digital selector and a plurality of resistors, the switch of the digital selector is connected to one or more of the plurality of resistors, and the level The converter further includes a comparison feedback unit, the input terminal of the comparison feedback unit is connected to the output terminal of the digital selector.

In the display device of the present application, the level converter further includes: a control unit, the output terminal of the control unit is connected to the input terminal of the digital selector for controlling the switch connection of the digital selector One or more of the multiple resistors are used to adjust the threshold current value of the overcurrent protection circuit, and the resistance of each resistor of the multiple resistors is different.

In the display device of the present application, the level converter further includes: a control unit, the output terminal of the control unit is connected to the input terminal of the digital selector for controlling the switch connection of the digital selector One or more of the plurality of resistors are used to adjust the threshold current value of the overcurrent protection circuit, and the level signal is sent from a filtered stable voltage.

In the display device of the present application, the level shifter further includes: a comparison feedback unit, an input terminal of the comparison feedback unit is connected to an output terminal of the digital selector, and each of the plurality of resistors The resistance values are different, and the level signal is sent out by the filtered stable voltage.

Beneficial effect

The overcurrent protection circuit in the embodiment of the present application includes: a panel; a logic board, the first output terminal of the logic board is connected to the first input terminal of the panel; a level converter, the input of the level converter Terminal is connected to the second output terminal of the logic board, the first output terminal of the level converter is connected to the second input terminal of the panel; wherein, the second output terminal of the level converter is connected to the logic board Board, for when the logic board sends an electrical signal to the level converter through the second output terminal, if the actual current value flowing inside the level converter is greater than the threshold current value, the The level converter sends a level signal to the logic board through the second output terminal, and the logic board interrupts the output signal of the first output terminal after receiving the level signal. Therefore, manual check-up of the meter can be avoided, and the waste of resources and manpower can be reduced.

Description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

FIG. 1 is a schematic structural diagram of a display device provided by an embodiment of the application.

FIG. 2 is a schematic structural diagram of an overcurrent protection circuit provided by an embodiment of the application.

3 is a schematic diagram of the first structure of the level shifter in the overcurrent protection circuit provided by the embodiment of the application.

FIG. 4 is a schematic diagram of the second structure of the level shifter in the overcurrent protection circuit provided by the embodiment of the application.

FIG. 5 is a schematic flowchart of an overcurrent protection method provided by an embodiment of the application.

Embodiments of the invention

The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative work are within the protection scope of this application.

Existing array substrate row drive technology (GateDriveronArray, GOA) products mainly use level conversion circuits for over current protection (Over Current Protection, OCP). In the actual project operation process, the resistance value must be deduced according to the measured OCP threshold current. size. You can search according to the comparison table in Table 1, and replace the resistance shown in Table 1 with the actual value you need. This will largely waste resources and manpower.

R of pin SET_OCP (KG)	OCP Threshold (mA)
R0	l0
R1	l1
R2	l2
...	...
R254	l254
R255	l255

Table I

An embodiment of the present application provides a display device, which includes an overcurrent protection circuit and a housing, the overcurrent protection circuit is disposed on the housing, and the overcurrent protection circuit includes:

panel;

A logic board, the first output terminal of the logic board is connected to the first input terminal of the panel;

A level shifter, the input end of the level shifter is connected to the second output end of the logic board, and the first output end of the level shifter is connected to the second input end of the panel; wherein,

The second output terminal of the level shifter is connected to the logic board, and is used for when the logic board sends an electrical signal to the level shifter through the second output terminal, if the level shifter If the actual current value flowing inside is greater than the threshold current value, the level converter sends a level signal to the logic board through the second output terminal, and the logic board is interrupted after receiving the level signal The output signal of the first output terminal.

Wherein, the level converter includes: a digital selector and a plurality of resistors, and a switch of the digital selector is connected to one or more of the plurality of resistors.

Wherein, the level converter further includes: a control unit, the output terminal of the control unit is connected to the input terminal of the digital selector, and is used to control the switch of the digital selector to be connected to one of the plurality of resistors Or more to adjust the threshold current value of the overcurrent protection circuit.

Wherein, at least one end of the plurality of resistors is grounded.

Wherein, the level converter further includes: a comparison feedback unit, and an input end of the comparison feedback unit is connected to an output end of the digital selector.

Wherein, the resistance of each of the plurality of resistors is different.

Wherein, the level signal is issued by the filtered stable voltage.

Wherein, the level converter includes: a digital selector and a plurality of resistors, the switch of the digital selector is connected to one or more of the plurality of resistors, and the level converter further includes: a comparison feedback unit , The input terminal of the comparison feedback unit is connected to the output terminal of the digital selector.

Wherein, the level converter further includes: a control unit, the output terminal of the control unit is connected to the input terminal of the digital selector, and is used to control the switch of the digital selector to be connected to one of the plurality of resistors Or more to adjust the threshold current value of the overcurrent protection circuit, each of the plurality of resistors has a different resistance.

Wherein, the level converter further includes: a control unit, the output terminal of the control unit is connected to the input terminal of the digital selector, and is used to control the switch of the digital selector to be connected to one of the plurality of resistors Or more, to adjust the threshold current value of the overcurrent protection circuit, and the level signal is sent from the filtered stable voltage.

Wherein, the level shifter further includes: a comparison feedback unit, the input terminal of the comparison feedback unit is connected to the output terminal of the digital selector, the resistance value of each of the plurality of resistors is different, the The level signal is sent by the filtered stable voltage.

Please refer to FIG. 1, which is a schematic structural diagram of a display device 1000 according to an embodiment of the application. The display device 100 may include an overcurrent protection circuit 100, a light emitting panel 200, and a housing 300. It should be noted that the display device 1000 shown in FIG. 1 is not limited to the above content, and may also include other devices, such as a camera, an antenna structure, a pattern unlocking module, and the like.

Wherein, the overcurrent protection circuit 100 is arranged on the housing 300.

In some embodiments, the light-emitting panel 200 may be fixed to the housing 300, and the light-emitting panel 200 and the housing 300 form a closed space to accommodate devices such as the overcurrent protection circuit 100.

In some embodiments, the housing 300 may be made of a flexible material, such as a plastic housing or a silicone housing.

Wherein, the overcurrent protection circuit 100 is installed in the housing 300, and the overcurrent protection circuit 100 can also be integrated with a battery, antenna structure, microphone, speaker, headphone interface, universal serial bus interface, camera, distance sensor, ambient light One, two or more of functional components such as sensors, receivers, and processors.

Wherein, the light-emitting panel 200 is installed in the housing 300, and at the same time, the overcurrent protection circuit 100 is electrically connected to the light-emitting panel 200. The light emitting panel 200 may include a display area and a non-display area. The display area can be used to display the screen of the display device 1000 or for the user to perform touch manipulation. This non-display area can be used to set various functional components.

Please refer to FIG. 2, which is a schematic structural diagram of an overcurrent protection circuit provided by an embodiment of the application. The overcurrent protection circuit 100 includes a panel 10; a logic board 20, the first output terminal 201 of the logic board 20 is connected to the first input terminal 101 of the panel 10; a level shifter 30, the level shifter 30 The input terminal 301 is connected to the second output terminal 202 of the logic board 20, and the first output terminal 302 of the level shifter 30 is connected to the second input terminal 102 of the panel 10; wherein, the level shifter The second output terminal 303 of 30 is connected to the logic board 20, and is used for when the logic board 20 sends an electrical signal to the level converter 30 through the second output terminal 202, if the level converter If the actual current value flowing inside 30 is greater than the threshold current value, the level converter 30 sends a level signal to the logic board 20 through the second output terminal 303, and the logic board 20 receives the The output signal of the first output terminal 201 is interrupted after the level signal.

Among them, the logic board 20 is the screen driver board (TCON board), which converts input signals (R, G, B data signals, clock signals, control signals) into a signal (LVDS) that can drive the panel 10 after being processed by the logic board 20. ), and then directly sent to the LVDS receiving chip in the LCD screen to drive the panel 10 to display.

Here, the logic board 20, the level shifter 30, and the panel 10 are electrically connected to form a closed circuit. If the level shifter 30 detects that the current value l actually flowing through it is greater than the threshold current value l', the electrical The level converter 30 sends a level signal to the logic board 20, where the level signal can be set as a high or low level signal according to actual needs, and sends a high or low level signal to the logic board through the second output terminal 303 20. After receiving the high or low level signal, the logic board 20 interrupts the signal sent to the first input terminal 101 of the panel 10 through the first output terminal 201 of the logic board 20 through its internal output inhibit circuit. To prevent burning of the panel 10.

For example: the threshold current value is 15 milliamps (mA). When the input terminal 301 of the level shifter 30 receives the electrical signal (that is, the GOA signal) output from the second input terminal 202 of the logic board 20, the level shifter 30 internally compares the actual current value l carried by the electrical signal with the threshold current value l'. If the actual current value l is 20 mA, the level shifter 30 determines that the actual current value l is greater than the threshold current value l', and the level shifter 30 sends a high or low level signal to the logic board 20 through the second output terminal 303 After receiving the high or low level signal, the logic board 20 interrupts the signal sent through the first output terminal 201 of the logic board 20 to the first input terminal 101 of the panel 10 through its internal output inhibit circuit.

If the actual current value l is 10mA, the level converter 30 determines that the actual current value l is less than the threshold current value l', which is a safe current, and there is no need to send a level signal to the logic board 20, and the logic board 20 normally passes the first output The terminal 201 sends a signal to the first input terminal 101 of the panel 10.

The overcurrent protection circuit provided by the embodiment of the present application includes: a panel 10; a logic board 20. The first output terminal 201 of the logic board 20 is connected to the first input terminal 101 of the panel 10; The input terminal 301 of the level shifter 30 is connected to the second output terminal 202 of the logic board 20, and the first output terminal 302 of the level shifter 30 is connected to the second input terminal 102 of the panel 10; wherein, The second output terminal 303 of the level shifter 30 is connected to the logic board 20, and is used for when the logic board 20 sends an electrical signal to the level shifter 30 through the second output terminal 202, if If the actual current value flowing inside the level shifter 30 is greater than the threshold current value, the level shifter 30 sends a level signal to the logic board 20 through the second output terminal 303, and the logic board 20 interrupts the output signal of the first output terminal 201 after receiving the level signal. Therefore, manual check-up can be avoided, and the waste of resources and manpower can be reduced.

In some embodiments, as shown in FIG. 3, FIG. 3 is a schematic diagram of the first structure of the level shifter in the overcurrent protection circuit provided by the embodiment of the application.

The level shifter 30 includes a digital selector 304 and a plurality of resistors 305, and a switch of the digital selector 304 is connected to one or more of the plurality of resistors 305.

Here, the switch of the digital selector 304 is connected to one or more of the plurality of resistors 305 to determine the upper limit of the current allowed to pass through the level converter 30, that is, to determine the threshold current value l', and the function of the digital selector 304 The switch is a single-pole multi-throw switch.

For example: when the switch of the digital selector 304 is thrown to a resistance of 5 ohms (Ω), so that the maximum current that can flow through the level converter 30 is 15 mA, then set the resistance to 5 when the switch is thrown When the resistance of ohm (Ω) is applied, the current threshold l'that can pass through the level converter 30 is 15 mA.

In some embodiments, as shown in FIG. 4, FIG. 4 is a schematic diagram of the second structure of the level shifter in the overcurrent protection circuit provided by the embodiment of the application.

The switch of the digital selector 304 here is a double-pole multi-throw switch, and the double-pole multi-throw switch can be thrown onto two of the multiple resistors 305 here. To form a parallel or series circuit, which can be changed according to actual needs.

In some embodiments, the level converter 30 further includes: a control unit 306. The output terminal 3061 of the control unit 306 is connected to the input terminal 3041 of the digital selector 304 for controlling the digital selector 304. The switch of is connected to one or more of the plurality of resistors 305 to adjust the threshold current value l'of the overcurrent protection circuit.

It can be understood that when the control unit 306 here controls the switch of the digital selector 304, it can be controlled by a fixed program in the display device 1000, or it can be controlled manually, which will not be repeated here. The control unit 306 can send a control signal to the input terminal 3041 of the digital selector 304 through the output terminal 3061 to control the switch of the digital selector 304.

In some embodiments, at least one end of the plurality of resistors 305 is grounded. At least one end of the plurality of resistors 305 is grounded to form a resistance to ground.

In some embodiments, the level converter 30 further includes a comparison feedback unit 307, and the input terminal 3071 of the comparison feedback unit 307 is connected to the output terminal 3042 of the digital selector 304.

In normal use, the actual current value l sent by the logic board 20 to the level converter 30 will first pass through the digital selector 304, and then pass through the comparison and feedback unit 307. Here, the comparison and feedback unit 307 is used to compare the actual current l flowing through the digital selector 304 with the threshold current value l'.

In some embodiments, the resistance of each of the plurality of resistors 305 is different.

The number of the multiple resistors 305 here can be set to 255 resistors from 00000000 to 11111111 according to the corresponding binary in Table 1, or can be set according to different needs, so that the setting accuracy is more precise.

In some embodiments, the level signal is issued by a filtered stable voltage.

It can be understood that after the comparison and feedback unit 307 compares the current values, if the actual current l is greater than the threshold current value l', the level signal can be sent out by the filtered stable voltage.

The overcurrent protection circuit provided by the embodiment of the present application includes: a panel 10; a logic board 20. The first output terminal 201 of the logic board 20 is connected to the first input terminal 101 of the panel 10; The input terminal 301 of the level shifter 30 is connected to the second output terminal 202 of the logic board 20, and the first output terminal 302 of the level shifter 30 is connected to the second input terminal 102 of the panel 10; wherein, The second output terminal 303 of the level shifter 30 is connected to the logic board 20, and is used when the logic board 20 sends an electrical signal to the level shifter 30 through the second output terminal 202, if If the actual current value flowing inside the level shifter 30 is greater than the threshold current value, the level shifter 30 sends a level signal to the logic board 20 through the second output terminal 303, and the logic board 20 interrupts the output signal of the first output terminal 201 after receiving the level signal. Therefore, manual check-up can be avoided, and the waste of resources and manpower can be reduced.

The embodiment of the present application also provides an overcurrent protection method, as shown in FIG. 5, which is a schematic flowchart of the overcurrent protection method provided by the embodiment of the present application. The overcurrent protection method is applied to an overcurrent protection circuit including a level converter, a logic board and a panel, and includes:

Step 110: preset a threshold current value;

The threshold current value here is formed by connecting the switch of the internal digital selector of the level shifter in the overcurrent protection circuit and multiple resistors.

Step 120: Receive the electrical signal sent by the logic board;

The electrical signal here is GOA signal.

Step 130: Determine whether the actual current value carried by the electrical signal is greater than the threshold current value; if so, perform step 140.

Here, judging the relationship between the actual current value and the threshold current value is through the internal comparison and feedback unit of the level converter.

Step 140: If the actual current value carried by the electrical signal is greater than the threshold current value, send a level signal to the logic board;

The level signal here can be set as a high or low level signal according to actual needs.

Step 150: When the logic board receives the level signal, it interrupts the connection with the panel.

The overcurrent protection method provided by the embodiment of the present application includes: presetting a threshold current value; receiving an electrical signal sent by a logic board; determining whether the actual current value carried by the electrical signal is greater than the threshold current value; if so, A level signal is sent to the logic board; when the logic board receives the level signal, the connection with the panel is interrupted. Therefore, manual check-up of the meter can be avoided, and the waste of resources and manpower can be reduced.

The over-current protection circuit, method, and display device provided by the embodiments of the application are described in detail above. Specific examples are used in this article to illustrate the principles and implementations of the application. The description of the above embodiments is only for Help to understand the technical solutions and core ideas of the application; those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or equivalently replace some of the technical features; and these modifications Or alternatively, the essence of the corresponding technical solutions does not deviate from the scope of the technical solutions of the embodiments of the present application.

Claims (20)

1. An overcurrent protection circuit, which includes:

   panel;

   A logic board, the first output terminal of the logic board is connected to the first input terminal of the panel;

   A level shifter, the input end of the level shifter is connected to the second output end of the logic board, and the first output end of the level shifter is connected to the second input end of the panel; wherein,

   The second output terminal of the level shifter is connected to the logic board, and is used for when the logic board sends an electrical signal to the level shifter through the second output terminal, if the level shifter If the actual current value flowing inside is greater than the threshold current value, the level converter sends a level signal to the logic board through the second output terminal, and the logic board is interrupted after receiving the level signal The output signal of the first output terminal.
2. The overcurrent protection circuit according to claim 1, wherein the level shifter comprises: a digital selector and a plurality of resistors, and a switch of the digital selector is connected to one or more of the plurality of resistors.
3. The overcurrent protection circuit according to claim 2, wherein the level shifter further comprises: a control unit, the output terminal of the control unit is connected to the input terminal of the digital selector for controlling the digital selector The switch is connected to one or more of the plurality of resistors to adjust the threshold current value of the overcurrent protection circuit.
4. The overcurrent protection circuit according to claim 3, wherein at least one end of the plurality of resistors is grounded.
5. The overcurrent protection circuit according to claim 1, wherein the level shifter further comprises: a comparison feedback unit, an input terminal of the comparison feedback unit is connected to an output terminal of the digital selector.
6. The overcurrent protection circuit according to claim 1, wherein the resistance value of each of the plurality of resistors is different.
7. The overcurrent protection circuit according to claim 1, wherein the level signal is issued by a filtered stable voltage.
8. An overcurrent protection method, applied to an overcurrent protection circuit including a level converter, a logic board, and a panel, includes:

   Pre-set threshold current value;

   Receive electrical signals sent by the logic board;

   Determine whether the actual current value carried by the electrical signal is greater than the threshold current value;

   If yes, send a level signal to the logic board;

   When the logic board receives the level signal, it interrupts the connection with the panel.
9. The overcurrent protection method according to claim 8, wherein the step of presetting the threshold current value comprises:

   The digital selector inside the level shifter is connected in advance to one or more of the multiple resistors inside the level shifter to determine the threshold current value.
10. A display device includes an overcurrent protection circuit and a housing, the overcurrent protection circuit is arranged on the housing, and the overcurrent protection circuit includes:

    panel;

    A logic board, the first output terminal of the logic board is connected to the first input terminal of the panel;

    A level shifter, the input end of the level shifter is connected to the second output end of the logic board, and the first output end of the level shifter is connected to the second input end of the panel; wherein,

    The second output terminal of the level shifter is connected to the logic board, and is used for when the logic board sends an electrical signal to the level shifter through the second output terminal, if the level shifter If the actual current value flowing inside is greater than the threshold current value, the level converter sends a level signal to the logic board through the second output terminal, and the logic board is interrupted after receiving the level signal The output signal of the first output terminal.
11. 10. The display device according to claim 10, wherein the level shifter comprises: a digital selector and a plurality of resistors, and a switch of the digital selector is connected to one or more of the plurality of resistors.
12. 11. The display device according to claim 11, wherein the level shifter further comprises: a control unit whose output terminal is connected to the input terminal of the digital selector for controlling the switch of the digital selector One or more of the multiple resistors are connected to adjust the threshold current value of the overcurrent protection circuit.
13. The display device according to claim 12, wherein at least one end of the plurality of resistors is grounded.
14. 11. The display device according to claim 10, wherein the level shifter further comprises: a comparison feedback unit, an input terminal of the comparison feedback unit is connected to an output terminal of the digital selector.
15. 11. The display device of claim 10, wherein the resistance of each of the plurality of resistors is different.
16. 11. The display device of claim 10, wherein the level signal is sent from a filtered stable voltage.
17. The display device according to claim 10, wherein the level shifter comprises: a digital selector and a plurality of resistors, the switch of the digital selector is connected to one or more of the plurality of resistors, and the electric The flat converter further includes a comparison feedback unit, the input end of the comparison feedback unit is connected to the output end of the digital selector.
18. The display device according to claim 10, wherein the level shifter further comprises: a control unit, the output terminal of the control unit is connected to the input terminal of the digital selector for controlling the switch of the digital selector One or more of the multiple resistors are connected to adjust the threshold current value of the overcurrent protection circuit, and the resistance value of each resistor of the multiple resistors is different.
19. The display device according to claim 10, wherein the level shifter further comprises: a control unit, the output terminal of the control unit is connected to the input terminal of the digital selector for controlling the switch of the digital selector One or more of the multiple resistors are connected to adjust the threshold current value of the overcurrent protection circuit, and the level signal is sent out by a filtered stable voltage.
20. The display device according to claim 10, wherein the level shifter further comprises: a comparison feedback unit, an input terminal of the comparison feedback unit is connected to an output terminal of the digital selector, and each of the plurality of resistors The resistance values of the resistors are all different, and the level signal is sent from the filtered stable voltage.