WO2020113825A1 - Mismatch protection system and method for display drive circuit - Google Patents

Abstract

A mismatch protection system and method for a display drive circuit. The system comprises: a first circuit board (1) and a second circuit board (2). The first circuit board (1) is provided with a detection and control module (3), an output module (4) electrically connected to the detection and control module (3), and a first connection module (5) electrically connected to the detection and control module (3); a second connection module (6) is provided on the second circuit board (2) for pairing with the first connection module (5); when the first connection module (5) is paired with the second connection module (6), the detection and control module (3) sends a detection signal to the first connection module (5) and, determines according to whether the detection signal can be returned to the detection and control module (3), whether the first connection module (5) and the second connection module (6) are mismatched; if yes, the detection and control module (3) sends a protection signal to the output module to control the output module (4) to stop working so as to prevent burning of the display drive circuit due to mismatch.

Description

Oblique insertion protection system and oblique insertion protection method for display drive circuit Technical field

The invention relates to the field of display technology, and in particular to an oblique insertion protection system and oblique insertion protection method for a display driving circuit.

Background technique

With the development of display technology, liquid crystal displays (LCD) and other flat display devices have been widely used in mobile phones, TVs, and individuals due to their advantages of high image quality, power saving, thin body, and wide application range. Various consumer electronic products such as digital assistants, digital cameras, notebook computers, and desktop computers have become the mainstream in display devices.

Most of the liquid crystal display devices on the existing market are backlight type liquid crystal displays, which include a liquid crystal display panel and a backlight module. The working principle of the liquid crystal display panel is to place liquid crystal molecules in two parallel glass substrates. There are many vertical and horizontal small wires between the two glass substrates. The liquid crystal molecules can be controlled to change the direction by energizing or not, and the light of the backlight module Refracted to produce a picture.

Generally, the liquid crystal display panel also needs to be driven by an external driving circuit. The external driving circuit generally includes: a printed circuit board (Printed Circuit Board (PCB) timing control chip (TCON), power management chip (Power manage IC), and level shift chip (Level Shift), etc., where the timing control chip is mainly used for low-voltage differential (Low-Voltage Differential Signaling (LVDS) signal is converted into a Mini-LVDS signal with a low amplitude transmission frequency and a high clock signal for driving a liquid crystal panel. The power management chip is mainly used to generate various voltages for driving a liquid crystal display panel, and the level shift The chip mainly boosts the clock signal, so that the voltage of the clock signal meets the driving requirements of the display panel.

With the development of display technology, users have higher and higher requirements on the display screen, and there are more and more driving devices on the external driving circuit to ensure the driving effect and improve the display quality. At the same time, the size of the display panel is getting larger and larger. At this time, a printed circuit board (PCB) can no longer meet the layout of the external drive circuit, so the existing technology will arrange the external drive circuit on multiple PCB boards, different PCB boards are connected by connectors, in the manufacturing process of the device In the process, due to the uneven professionalism of the operators, when connecting each connector, there will often be a misalignment of the pins of each connector that should be connected one by one, connecting two non-corresponding pins together, that is Slant insertion, slant insertion will cause the signal transmission error of the external drive circuit, and even a large current appears, so that the external drive circuit burns out, resulting in a waste of resources.

technical problem

An object of the present invention is to provide an oblique insertion protection system for a display driving circuit, which can prevent the display driving circuit from being burned due to the oblique insertion, protect the display driving circuit and improve the fault tolerance of the manufacturing process.

The object of the present invention is also to provide an oblique insertion protection method for a display drive circuit, which can avoid the display drive circuit from being burned due to the oblique insertion, protect the display drive circuit and improve the fault tolerance rate of the manufacturing process.

Technical solution

To achieve the above object, the present invention provides an oblique insertion protection system for a display driving circuit, including: a first circuit board and a second circuit board;

The first circuit board is provided with a detection control module, an output module electrically connected to the detection control module, and a first connection module electrically connected to the detection control module; the second circuit board There is a second connection module for mating connection with the first connection module;

The detection control module includes a first pin for outputting a detection signal, a second pin for receiving a detection signal, and a third pin for outputting a protection signal;

The first connection module includes a first feedback pin connected to the first pin and a second feedback pin connected to the second pin; the second connection module includes a third feedback pin and A fourth feedback pin electrically connected to the third feedback pin;

When the first connection module and the second connection module are correctly connected, the first feedback pin, the third feedback pin, the fourth feedback pin, and the second feedback pin are connected in series to form a transmission loop, and the detection signal passes The transmission loop returns to the second pin, the third pin has no signal output, and the output module works normally;

When the first connection module and the second connection module are inserted obliquely, the first feedback pin, the third feedback pin, the fourth feedback pin and the second feedback pin are disconnected, and the detection signal cannot be returned The second pin, the third pin outputs a protection signal, and the output module stops working.

The detection control module is a timing controller.

The output module includes: a level shift chip, a power chip and a control switch;

The level shift chip is electrically connected to the third pin; the control end of the control switch is electrically connected to the third pin, the first connection end is electrically connected to the power chip, and the second connection end Ground.

When the third pin outputs a protection signal, the control switch is turned on, and when the third pin has no signal output, the control switch is turned off.

The control switch is a MOS tube, the gate of the MOS tube is a control terminal, the drain is a first connection terminal, and the source is a second connection terminal.

The invention also provides an oblique insertion protection method for a display driving circuit, which includes the following steps:

Step S1, providing a first circuit board and a second circuit board;

The first circuit board is provided with a detection control module, an output module electrically connected to the detection control module, and a first connection module electrically connected to the detection control module; the second circuit board There is a second connection module for mating connection with the first connection module;

The detection control module includes a first pin for outputting a detection signal, a second pin for receiving a detection signal, and a third pin for outputting a protection signal; the first connection module includes and A first feedback pin connected to the first pin and a second feedback pin connected to the second pin; the second connection module includes a third feedback pin and the third feedback pin The fourth feedback pin electrically connected;

Step S2: Connect the first connection module and the second connection module;

Step S3: Determine whether the first connection module and the second connection module are connected obliquely and control whether the output module works accordingly;

If the first feedback pin, the third feedback pin, the fourth feedback pin, and the second feedback pin are connected in series to form a transmission loop, and the detection signal is transmitted back to the second pin through the transmission loop, there is no diagonal insertion , The third pin has no signal output, and the output module works normally;

If the first feedback pin, the third feedback pin, the fourth feedback pin, and the second feedback pin are disconnected, and the detection signal cannot be transmitted back to the second pin, the third lead is inserted obliquely. The foot outputs a protection signal, and the output module stops working.

The detection control module is a timing controller.

The output module includes: a level shift chip, a power chip and a control switch;

The level shift chip is electrically connected to the third pin; the control end of the control switch is electrically connected to the third pin, the first connection end is electrically connected to the power chip, and the second connection end Ground.

When the third pin outputs a protection signal, the control switch is turned on, and when the third pin has no signal output, the control switch is turned off.

The control switch is a MOS tube, the gate of the MOS tube is a control terminal, the drain is a first terminal, and the source is a second terminal.

Beneficial effect

Beneficial effect of the present invention: The present invention provides an oblique insertion protection system for a display drive circuit, which includes: a first circuit board and a second circuit board; a detection control module and the detection are provided on the first circuit board An output module electrically connected to the test control module and a first connection module electrically connected to the detection control module; the second circuit board is provided with a second connection module for mating connection with the first connection module ; When the first connection module and the second connection module are paired and connected, a detection signal is sent to the first connection module through the detection control module, and the detection control module determines whether the detection signal can be returned Whether the first connection module and the second connection module are obliquely inserted, and when obliquely inserted, the detection control module sends a protection signal to the output module to control the output module to stop working to avoid the display drive circuit from being burned due to oblique insertion. Protect the display drive circuit while improving the fault tolerance of the process. The invention also provides an oblique insertion protection method for the display drive circuit, which can avoid the display drive circuit from being burned due to the oblique insertion, protect the display drive circuit and improve the fault tolerance rate of the manufacturing process at the same time.

BRIEF DESCRIPTION

In order to further understand the features and technical content of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings are provided for reference and explanation only, and are not intended to limit the present invention.

In the drawings,

1 is a schematic diagram of the correct connection of the oblique insertion protection system of the display drive circuit of the present invention;

2 is a schematic diagram of the oblique insertion protection system of the display driving circuit of the present invention when obliquely inserted;

FIG. 3 is a flowchart of the oblique insertion protection method of the display driving circuit of the present invention.

Embodiments of the invention

In order to further elaborate on the technical means adopted by the present invention and its effects, the following will be described in detail with reference to the preferred embodiments of the present invention and the accompanying drawings.

Please refer to the picture 1 And figure 2 The present invention provides an oblique insertion protection system for a display driving circuit, including: a first circuit board 1 And the second circuit board 2 ;

The first circuit board 1 On the detection control module 3 , And the detection control module 3 Electrically connected output module 4 And with the detection control module 3 Electrically connected first connection module 5 ; The second circuit board 2 There is a module for connecting with the first 5 Paired connected second connection module 6 ;

The detection control module 3 Including the first pin for outputting detection signal 31 , The second pin for receiving the detection signal 32 And the third pin for outputting the protection signal 33 ;

The first connection module 5 Included with the first pin 31 Connected first feedback pin 51 And with the second pin 32 Connected second feedback pin 52 ; The second connection module 6 Including the third feedback pin 61 And with the third feedback pin 61 Electrically connected fourth feedback pin 62 .

It should be noted that the first circuit board 1 And the second circuit board 2 For the two printed circuit boards used to form the display drive circuit, the first connection module 5 With the second connection module 6 For connecting the first circuit board 1 And the second circuit board 2 The two connectors, the operator connects the first connection module by 5 And the second connection module 6 Connected together so that the first circuit board 1 And the second circuit board 2 Connect to form a complete display drive circuit.

In fact, the first connection module 5 There are several first connection pins arranged in sequence 53 , The second connection module 6 Several second connection pins arranged in sequence 63 , Each first connection pin 53 Are used to connect with a second pin 63 Corresponding to the connection, the first feedback pin 51 And the second feedback pin 52 For the first connection pin 53 The selected two, the third feedback pin 61 And the fourth feedback pin 62 For several second connection pins 63 Two selected, preferably, the first feedback pin 51 And the second feedback pin 52 For the two outermost first connection pins 53 , The third feedback pin 61 And the fourth feedback pin 62 For the two outermost second connection pins 63 .

As shown 1 As shown in the first connection module 5 And the second connection module 6 In the case of correct connection, each first connection pin 53 Are correspondingly connected to their corresponding second connection pins 63 On, of course, the first feedback pin 51 Corresponding to the third feedback pin 61 , Second feedback pin 52 Which corresponds to the fourth feedback pin 62 So that the first feedback pin 51 3rd feedback pin 61 4th feedback pin 62 And the second feedback pin 52 Serially form a transmission loop in series, the first pin 31 The detection signal sent out can be returned to the second pin through the transmission loop 12 , The detection control diaphragm 3 On the second pin 12 After receiving the detection signal, control the third pin 13 Does not output any signal, the output module 5 No signal is received, keep normal operation.

As shown 2 As shown in the first connection module 5 And the second connection module 6 In the case of oblique insertion without correct connection, each first connection pin 53 Are not correspondingly connected to their corresponding second connection pins 63 On, of course, the first feedback pin 51 No corresponding third feedback pin is connected 61 , Second feedback pin 52 The fourth feedback pin is not connected to the corresponding 62 , For example 2 As shown, the first feedback pin 51 No pin connected, second feedback pin 52 Connect to the fourth feedback pin 62 An adjacent second connection pin 63 On the third feedback pin 61 Connect to the first feedback pin 51 An adjacent first connection pin 61 On the fourth feedback pin 62 No pin is connected, at this time the first feedback pin 51 3rd feedback pin 61 4th feedback pin 62 And the second feedback pin 52 Open circuit, the detection signal cannot be transmitted back to the second pin 12 , The third pin 13 Output protection signal, the output module 4 Stop working to prevent the burning of the circuit due to large current.

It should be noted that the detection control module 3 For the timing controller, the output module 4 Including: level shift chip 41 、Power chip 42 And control switch 43 ; The level shift chip 41 With the third pin 13 Electrical connection; the control switch 43 The control terminal and the third pin 13 Electrically connected, the first connection end and the power chip 42 Electrically connected, the second connection terminal is grounded.

The output module 4 During normal operation, the level shift chip 41 Receiving timing signals from the timing controller, the power chip 42 Output power supply voltage value level shift chip 41 , The level shift chip 41 Boosting the timing signal using the power supply voltage, and outputting the boosted timing signal to the display panel; the output module 4 When stop working, the power chip 42 Stop output power supply voltage value level shift chip 41 , The level shift chip 41 Stop outputting the boosted timing signal to the display panel.

Specifically, the level shift chip 41 With shift control pin 411 And several shift function pins (not shown), the power chip 42 Power control pin 421 And several power function pins (not shown), the timing controller is provided with a first pin 31 , Second pin 32 , Third pin 33 And several timing function pins (not shown), the transmission of the timing signals and power signals is completed through the shift function pins, power function pins, and timing function pins.

The level shift chip 41 Shift control pin 411 With the third pin 13 Electrical connection, the power chip 42 Power control pin 421 With control switch 43 The first connection terminal is electrically connected, the third pin 13 When a protection signal is output, the control switch 43 Turn on, the power control pin 421 Is pulled down to ground potential, the power chip 42 Controlled to stop working, the shift control pin 411 After receiving the protection signal, it is also controlled to stop working. The third pin 13 When there is no signal output, the control switch 43 Off, the power control pin 421 Keeps the normal potential, the power chip 42 Normal operation, the shift control pin 411 No signal is received and it works normally.

Preferably, the control switch 43 for MOS Tube, the MOS The gate of the tube is the control terminal, the drain is the first connection terminal, and the source is the second connection terminal.

Preferably, the protection signal is a 3.3V High potential signal.

Specifically, the first pin 31 , Second pin 32 And the third pin 33 Respectively for the timing controller GPIO5 Pins, GPIO6 Pin and WP Pin WP ; The shift control pin 411 For the level shift chip 41 of FLT Pin, the power control pin 421 Power chip 42 of COMP Pins.

Please refer to the picture 3 The present invention also provides an oblique insertion protection method for a display driving circuit, including the following steps:

step S1 、Provide the first circuit board 1 And the second circuit board 2 ;

The first circuit board 1 On the detection control module 3 , And the detection control module 3 Electrically connected output module 4 And with the detection control module 3 Electrically connected first connection module 5 ; The second circuit board 2 There is a module for connecting with the first 5 Paired connected second connection module 6 ;

The detection control module 3 Including the first pin for outputting detection signal 31 , The second pin for receiving the detection signal 32 And the third pin for outputting the protection signal 33 ; The first connection module 5 Included with the first pin 31 Connected first feedback pin 51 And with the second pin 32 Connected second feedback pin 52 ; The second connection module 6 Including the third feedback pin 61 And with the third feedback pin 61 Electrically connected fourth feedback pin 62 .

It should be noted that the first circuit board 1 And the second circuit board 2 For the two printed circuit boards used to form the display drive circuit, the first connection module 5 With the second connection module 6 For connecting the first circuit board 1 And the second circuit board 2 The two connectors, the operator connects the first connection module by 5 And the second connection module 6 Connected together so that the first circuit board 1 And the second circuit board 2 Connect to form a complete display drive circuit.

step S2 、Connect the first connection module 5 And the second connection module 6 ;

step S3 3. Determine the first connection module after connection 5 And the second connection module 6 Whether there is oblique insertion and correspondingly control whether the output module works;

If the first feedback pin 51 3rd feedback pin 61 4th feedback pin 62 And the second feedback pin 52 A transmission loop is formed in series in turn, and the detection signal is transmitted back to the second pin through the transmission loop 12 , It is not inserted obliquely; the third pin 13 No signal output, the output module 4 normal work;

If the first feedback pin 51 3rd feedback pin 61 4th feedback pin 62 And the second feedback pin 52 Open circuit, the detection signal cannot be transmitted back to the second pin 12 , Obliquely inserted; the third pin 13 Output protection signal, the output module 4 stop working.

In fact, the first connection module 5 There are several first connection pins arranged in sequence 53 , The second connection module 6 Several second connection pins arranged in sequence 63 , Each first connection pin 53 Are used to connect with a second pin 63 Corresponding to the connection, the first feedback pin 51 And the second feedback pin 52 For the first connection pin 53 The selected two, the third feedback pin 61 And the fourth feedback pin 62 For several second connection pins 63 Two selected, preferably, the first feedback pin 51 And the second feedback pin 52 For the two outermost first connection pins 53 , The third feedback pin 61 And the fourth feedback pin 62 For the two outermost second connection pins 63 .

As shown 1 As shown in the first connection module 5 And the second connection module 6 In the case of correct connection without diagonal insertion, each first connection pin 53 Are correspondingly connected to their corresponding second connection pins 63 On, of course, the first feedback pin 51 Corresponding to the third feedback pin 61 , Second feedback pin 52 Which corresponds to the fourth feedback pin 62 So that the first feedback pin 51 3rd feedback pin 61 4th feedback pin 62 And the second feedback pin 52 Serially form a transmission loop in series, the first pin 31 The detection signal sent out can be returned to the second pin through the transmission loop 12 , The detection control diaphragm 3 On the second pin 12 After receiving the detection signal, control the third pin 13 Does not output any signal, the output module 5 No signal is received, keep normal operation.

As shown 2 As shown in the first connection module 5 And the second connection module 6 In the case of oblique insertion without correct connection, each first connection pin 53 Are not correspondingly connected to their corresponding second connection pins 63 On, of course, the first feedback pin 51 No corresponding third feedback pin is connected 61 , Second feedback pin 52 The fourth feedback pin is not connected to the corresponding 62 , For example 2 As shown, the first feedback pin 51 No pin connected, second feedback pin 52 Connect to the fourth feedback pin 62 An adjacent second connection pin 63 On the third feedback pin 61 Connect to the first feedback pin 51 An adjacent first connection pin 61 On the fourth feedback pin 62 No pin is connected, at this time the first feedback pin 51 3rd feedback pin 61 4th feedback pin 62 And the second feedback pin 52 Open circuit, the detection signal cannot be transmitted back to the second pin 12 , The third pin 13 Output protection signal, the output module 4 Stop working to prevent the burning of the circuit due to large current.

The output module 4 During normal operation, the level shift chip 41 Receiving timing signals from the timing controller, the power chip 42 Output power supply voltage value level shift chip 41 , The level shift chip 41 Boosting the timing signal using the power supply voltage, and outputting the boosted timing signal to the display panel; the output module 4 When stop working, the power chip 42 Stop output power supply voltage value level shift chip 41 , The level shift chip 41 Stop outputting the boosted timing signal to the display panel.

Specifically, the level shift chip 41 With shift control pin 411 And several shift function pins (not shown), the power chip 42 Power control pin 421 And several power function pins (not shown), the timing controller is provided with a first pin 31 , Second pin 32 , Third pin 33 And several timing function pins (not shown), the transmission of the timing signals and power signals is completed through the shift function pins, power function pins, and timing function pins.

The level shift chip 41 Shift control pin 411 With the third pin 13 Electrical connection, the power chip 42 Power control pin 421 With control switch 43 The first connection terminal is electrically connected, the third pin 13 When a protection signal is output, the control switch 43 Turn on, the power control pin 421 Is pulled down to ground potential, the power chip 42 Controlled to stop working, the shift control pin 411 After receiving the protection signal, it is also controlled to stop working. The third pin 13 When there is no signal output, the control switch 43 Off, the power control pin 421 Keeps the normal potential, the power chip 42 Normal operation, the shift control pin 411 No signal is received and it works normally.

Preferably, the control switch 43 for MOS Tube, the MOS The gate of the tube is the control terminal, the drain is the first connection terminal, and the source is the second connection terminal.

Preferably, the protection signal is a 3.3V High potential signal.

Specifically, the first pin 31 , Second pin 32 And the third pin 33 Respectively for the timing controller GPIO5 Pins, GPIO6 Pin and WP Pin WP ; The shift control pin 411 For the level shift chip 41 of FLT Pin, the power control pin 421 Power chip 42 of COMP Pins.

In summary, the present invention provides an oblique insertion protection system for a display driving circuit, including: a first circuit board and a second circuit board; a detection control module and detection are provided on the first circuit board An output module electrically connected to the control module and a first connection module electrically connected to the detection control module; the second circuit board is provided with a second connection module paired with the first connection module; When the first connection module and the second connection module are paired and connected, a detection signal is sent to the first connection module by the detection control module, and the detection control module is judged according to whether the detection signal can be returned to the detection control module Whether a connection module and the second connection module are obliquely inserted, and when obliquely inserted, a protection signal is sent to the output module through the detection control module to control the output module to stop working, to avoid the display drive circuit from being burned due to oblique insertion and protection Display the drive circuit while improving the fault tolerance of the process. The invention also provides an oblique insertion protection method for the display drive circuit, which can avoid the display drive circuit from being burned due to the oblique insertion, protect the display drive circuit and improve the fault tolerance rate of the manufacturing process at the same time.

As mentioned above, those of ordinary skill in the art can make various other corresponding changes and modifications according to the technical solutions and technical concepts of the present invention, and all such changes and modifications should fall within the protection scope of the claims of the present invention. .

Claims (10)

1. An oblique insertion protection system for a display drive circuit, including: a first circuit board and a second circuit board;

   The first circuit board is provided with a detection control module, an output module electrically connected to the detection control module, and a first connection module electrically connected to the detection control module; the second circuit board There is a second connection module for mating connection with the first connection module;

   The detection control module includes a first pin for outputting a detection signal, a second pin for receiving a detection signal, and a third pin for outputting a protection signal;

   The first connection module includes a first feedback pin connected to the first pin and a second feedback pin connected to the second pin; the second connection module includes a third feedback pin and A fourth feedback pin electrically connected to the third feedback pin;

   When the first connection module and the second connection module are correctly connected, the first feedback pin, the third feedback pin, the fourth feedback pin, and the second feedback pin are connected in series to form a transmission loop, and the detection signal passes The transmission loop returns to the second pin, the third pin has no signal output, and the output module works normally;

   When the first connection module and the second connection module are inserted obliquely, the first feedback pin, the third feedback pin, the fourth feedback pin and the second feedback pin are disconnected, and the detection signal cannot be returned The second pin, the third pin outputs a protection signal, and the output module stops working.
2. The oblique insertion protection system of the display driving circuit according to claim 1, wherein the detection control module is a timing controller.
3. The oblique insertion protection system of the display driving circuit according to claim 1, wherein the output module comprises: a level shift chip, a power chip and a control switch;

   The level shift chip is electrically connected to the third pin; the control end of the control switch is electrically connected to the third pin, the first connection end is electrically connected to the power chip, and the second connection end Ground.
4. The oblique insertion protection system for a display driving circuit according to claim 3, wherein when the third pin outputs a protection signal, the control switch is turned on, and when the third pin has no signal output, the control switch shut down.
5. The oblique insertion protection system for a display driving circuit according to claim 3, wherein the control switch is a MOS tube, the gate of the MOS tube is a control terminal, the drain is a first connection terminal, and the source is a second connection terminal.
6. An oblique insertion protection method for a display drive circuit includes the following steps:

   Step S1, providing a first circuit board and a second circuit board;

   The first circuit board is provided with a detection control module, an output module electrically connected to the detection control module, and a first connection module electrically connected to the detection control module; the second circuit board There is a second connection module for mating connection with the first connection module;

   The detection control module includes a first pin for outputting a detection signal, a second pin for receiving a detection signal, and a third pin for outputting a protection signal; the first connection module includes and A first feedback pin connected to the first pin and a second feedback pin connected to the second pin; the second connection module includes a third feedback pin and the third feedback pin The fourth feedback pin electrically connected;

   Step S2: Connect the first connection module and the second connection module;

   Step S3: Determine whether the first connection module and the second connection module are connected obliquely and control whether the output module works accordingly;

   If the first feedback pin, the third feedback pin, the fourth feedback pin, and the second feedback pin are connected in series to form a transmission loop, and the detection signal is transmitted back to the second pin through the transmission loop, there is no diagonal insertion , The third pin has no signal output, and the output module works normally;

   If the first feedback pin, the third feedback pin, the fourth feedback pin, and the second feedback pin are disconnected, and the detection signal cannot be transmitted back to the second pin, the third lead is inserted obliquely. The foot outputs a protection signal, and the output module stops working.
7. The oblique insertion protection method of the display driving circuit according to claim 6, wherein the detection control module is a timing controller.
8. The oblique insertion protection method of the display driving circuit according to claim 6, wherein the output module comprises: a level shift chip, a power chip and a control switch;

   The level shift chip is electrically connected to the third pin; the control end of the control switch is electrically connected to the third pin, the first connection end is electrically connected to the power chip, and the second connection end Ground.
9. The oblique insertion protection method for a display driving circuit according to claim 8, wherein when the third pin outputs a protection signal, the control switch is turned on, and when the third pin has no signal output, the control switch shut down.
10. The oblique insertion protection method for a display driving circuit according to claim 8, wherein the control switch is a MOS tube, the gate of the MOS tube is a control terminal, the drain is a first terminal, and the source is a second terminal.