Display driver module and display device

Abstract

The embodiment of the present application discloses a display driving module and a display device, including a timing control circuit and a driving circuit, wherein the timing control circuit is electrically connected to the driving circuit and is used to control the driving circuit to output a data signal to a pixel unit in a display area to perform image display. The display driving module also includes a signal processing circuit and a switch circuit, wherein the switch circuit is electrically connected to the signal processing circuit, the timing control circuit and the driving circuit, the timing control circuit is used to selectively control the switch circuit to be turned on or off, the signal processing circuit is electrically connected to the switch circuit, and when the switch circuit is turned on, the signal processing circuit transmits instructions to the driving circuit through the switch circuit, and the instructions are used to adjust the preset parameters of the driving circuit. By setting the switch circuit and controlling the on and off of the switch circuit, the signal processing circuit can be effectively prevented from mistakenly writing code to the driving circuit, thereby avoiding changes in the preset parameters inside the driving circuit and improving the stability of the driving circuit.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display driving module and a display device. Background Art

[0002] In the display driver module of the current display panel, there is no strict distinction between the used and unused states of the IIC (Inter-Integrated Circuit) serial communication bus. The MSDA (data line) and MSCL (clock line) are always kept in a high level state, that is, pull high, and the microcontroller is also in a state of always conducting with the IIC interface of other peripheral ICs. When the microcontroller is burned with code or the display driver module is put on the machine to perform system-side operations and other series of actions that occur through the AUX channel, due to address conflicts, hidden registers or some bugs, the action of miswriting code will occur, where the AUX channel is used to transmit auxiliary information in the DisplayPort protocol between the DisplayPort Transmitter (DPTX) and the DisplayPort Receiver (DPRX).

[0003] Therefore, how to prevent the microcontroller from writing the wrong code to the drive circuit is an urgent problem to be solved. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present application provides a display driving module and a display device that can effectively avoid miswriting of driving circuit codes.

[0005] The present application provides a display driving module, including a timing control circuit and a driving circuit. The timing control circuit is electrically connected to the driving circuit and is used to control the driving circuit to output a data signal to a pixel unit in a display area to perform image display. The display driving module also includes a signal processing circuit and a switching circuit. The switching circuit is electrically connected to the signal processing circuit, the timing control circuit and the driving circuit. The timing control circuit is used to selectively control the switching circuit to be turned on or off. The signal processing circuit is electrically connected to the switching circuit. When the switching circuit is turned on, the signal processing circuit transmits instructions to the driving circuit through the switching circuit. The instructions are used to adjust preset parameters of the driving circuit.

[0006] Optionally, the switching circuit includes a control unit, an energy release unit and a conduction unit, the control unit is electrically connected to the timing control circuit and the energy release unit, the energy release unit is electrically connected to the conduction unit, and the conduction unit is electrically connected to the signal processing circuit and the drive circuit; the control unit is used to output a first control signal and a second control signal under the control of the timing control circuit, and transmit the signals to the conduction unit through the energy release unit, the conduction unit is turned on under the control of the first control signal to control the signal processing circuit to be electrically connected to the drive circuit, or is turned off under the control of the second control signal to control the signal processing circuit to be electrically disconnected from the drive circuit, and at the same time, the energy release unit receives the charge in the conduction unit and releases the charge to the ground terminal.

[0007] Optionally, the switching circuit also includes an adjustment unit, which is electrically connected to the control unit and the energy release unit. The adjustment unit is used to receive a first control signal and a second control signal from the control unit, and output a third control signal based on the first control signal, the third control signal is used to control the conduction of the conduction unit, and output a fourth control signal based on the second control signal, the fourth control signal is used to control the conduction unit to be cut off to control the electrical disconnection of the signal processing circuit and the drive circuit, wherein the voltage of the third control signal is greater than the voltage of the first control signal, and the voltage of the fourth control signal is less than or equal to the voltage of the second control signal.

[0008] Optionally, the control unit includes a first resistor, a first node, a second node, a first switch tube and a second switch tube, the first resistor is electrically connected between the timing control circuit and the first node, the control end of the first switch tube is electrically connected to the first node, the first end of the first switch tube is electrically connected to the first voltage end, and the second end of the first switch tube is electrically connected to the second node; the control end of the second switch tube is electrically connected to the first node, the first end of the second switch tube is electrically connected to the second voltage end, and the second end of the second switch tube is electrically connected to the second node; the first switch tube is turned on under the control of the timing control circuit, the first voltage end outputs a first control signal to the second node via the first switch tube, the second switch tube is turned on under the control of the second control signal, and the second voltage end outputs a second control signal to the second node via the second switch tube.

[0009] Optionally, the energy release unit includes a second resistor, a third resistor and a first diode, the first end of the second resistor is electrically connected to the second node, the second end of the second resistor is electrically connected to the conduction unit, and the first control signal and the second control signal are transmitted to the conduction unit via the second resistor;

[0010] The cathode of the first diode is electrically connected to the second node, the anode of the first diode is electrically connected to the first end of the third resistor, the second end of the third resistor is electrically connected to the conduction unit, and the first diode and the third resistor are used to release the charge of the conduction unit when the conduction unit is turned off.

[0011] Optionally, the control unit includes a first switch tube, a second switch tube, a first diode, a second diode, a first resistor, a second resistor and a third resistor, the control end of the first switch tube is electrically connected to the timing control circuit, the first end of the first switch tube is electrically connected to the first voltage end, the second end of the first switch tube is electrically connected to the first resistor and is electrically connected to the ground end through the first resistor; the control end of the second switch tube is electrically connected to the timing control circuit, the first end of the second switch tube is electrically connected to the second voltage end, the second end of the second switch tube is electrically connected to the second resistor and is electrically connected to the ground end through the second resistor; the anode of the first diode is electrically connected to the second end of the first switch tube, the cathode of the first diode is electrically connected to the first end of the third resistor, the anode of the second diode is electrically connected to the second end of the second switch tube, the cathode of the second diode is electrically connected to the first end of the third resistor, and the second end of the third resistor is electrically connected to the adjustment unit; the first switch tube is turned on according to the first control signal to receive the first control signal from the first voltage end and transmit it to the adjustment unit through the first diode, and the second switch tube is turned on according to the second control signal to receive the second control signal from the second voltage end and transmit it to the adjustment unit through the second diode.

[0012] Optionally, the adjustment unit includes a signal receiving module, a pull-up module and a pull-down module, the signal receiving module is electrically connected to the control unit, the pull-up module and the pull-down module, the signal receiving module is used to receive a first control signal and a second control signal, the pull-up module outputs a third control signal to the conduction unit according to the first control signal to control the conduction unit to be turned on, and the pull-down module outputs a fourth control signal to the conduction unit according to the second control signal to control the conduction unit to be turned off.

[0013] Optionally, the signal receiving module includes a third switch tube, a fourth switch tube, a third diode, a fourth resistor, a fifth resistor, a sixth resistor and a third node, the control end of the third switch tube is electrically connected to the fourth resistor and electrically connected to the third voltage end via the fourth resistor, the first end of the third switch tube is electrically connected to the control end of the fourth switch tube, the second end of the third switch tube is electrically connected to the third node, the cathode of the third diode is electrically connected to the third node, and the anode of the third diode is electrically connected to the ground end; the first end of the fourth switch tube is electrically connected to the fifth resistor and electrically connected to the third voltage end via the fifth resistor, the second end of the fourth switch tube is electrically connected to the sixth resistor, and electrically connected to the ground end via the sixth resistor; the control unit is electrically connected to the third node and outputs the first control signal and the second control signal to the signal receiving module via the third node, the third switch tube is turned on according to the first control signal to control the pull-up module to output the third control signal, and the third switch tube and the fourth switch tube are turned on according to the second control signal to control the pull-down module to output the fourth control signal.

[0014] Optionally, the pull-up module includes a fourth diode, a fifth switch tube, a seventh resistor and an eighth resistor, the control end of the fifth switch tube is electrically connected to the first end of the fourth switch tube, the first end of the fifth switch tube is electrically connected to the seventh resistor and electrically connected to the third voltage end through the seventh resistor, the second end of the fifth switch tube is electrically connected to the anode of the fourth diode, the cathode of the fourth diode is electrically connected to the first end of the eighth resistor, and the second end of the eighth resistor is electrically connected to the energy release unit; when the fourth switch tube is turned off, the fifth switch tube is turned on under the control of the third voltage end, and the third voltage end outputs a third control signal to the conduction unit through the fifth switch tube. The pull-down module includes a sixth switch tube, the control end of the sixth switch tube is electrically connected to the second end of the fourth switch tube, the first end of the sixth switch tube is electrically connected to the first end of the eighth resistor, and the second end of the sixth switch tube is electrically connected to the ground end; when the fourth switch tube is turned on, the sixth switch tube is turned on, and the ground end outputs a fourth control signal to the conduction unit through the sixth switch tube.

[0015] Optionally, the energy release unit includes a seventh switch tube, a fifth diode and a ninth resistor, the anode of the fifth diode is electrically connected to the second end of the eighth resistor, the anode of the fifth diode is electrically connected to the conduction unit, the control end of the seventh switch tube is electrically connected to the second end of the eighth resistor, the first end of the seventh switch tube is electrically connected to the ninth resistor and is electrically connected to the conduction unit via the ninth resistor, and the second end of the seventh switch tube is electrically connected to the ground end.

[0016] Optionally, the conduction unit includes an eighth switch tube, a tenth resistor, an eleventh resistor and a twelfth resistor, the control end of the eighth switch tube is electrically connected to the energy release unit, the first end of the eighth switch tube is electrically connected to the drive circuit, the second end of the eighth switch tube is electrically connected to the signal processing circuit, the eighth switch tube is turned on under the control of a first control signal, the signal processing circuit is electrically connected to the drive circuit through the eighth switch tube, and the eighth switch tube is cut off under the control of a second control signal; the tenth resistor is electrically connected between the control end and the second end of the eighth switch tube, the first end of the eleventh resistor is electrically connected to the first end of the eighth switch tube, the second end of the eleventh resistor is electrically connected to the power supply voltage end, the first end of the twelfth resistor is electrically connected to the second end of the eighth switch tube, and the second end of the second resistor is electrically connected to the power supply voltage end.

[0017] An embodiment of the present application further provides a display device, comprising a display panel and a display driving module as described above, wherein the display driving module is used to drive the display panel to perform image display.

[0018] Compared with the problems in the prior art, the embodiments of the present application set a switching circuit between the signal processing circuit and the driving circuit so that when the switching circuit is turned on, the signal processing circuit can transmit instructions to the driving circuit through the switching circuit to adjust the data parameters of the driving circuit, and control the switching circuit to be electrically disconnected to avoid the signal processing circuit from erroneously writing codes to the driving circuit when outputting signals, thereby avoiding changes in the preset parameters inside the driving circuit and improving the stability of the driving circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A schematic diagram of the structure of a display device provided in the first embodiment of the present application;

[0021] Figure 2 for Figure 1 Equivalent circuit diagram of the switch circuit in FIG.

[0022] Figure 3 A schematic diagram of an equivalent circuit of a switch circuit provided in the second embodiment of the present application;

[0023] Figure 4 A schematic diagram of an equivalent circuit of a first switching circuit provided in the third embodiment of the present application;

[0024] Figure 5 for Figure 4 Interface diagram of the connector.

[0025] Description of the accompanying drawings: display device-100, display driving circuit-10, display panel-20, timing control circuit-11, driving circuit-12, signal processing circuit-13, switching circuit-14, pixel unit-P, control unit-141, adjustment unit-142, energy release unit-143, conduction unit-144, first resistor-R1, second resistor-R2, third resistor-R3, fourth resistor-R4, fifth resistor-R5, sixth resistor-R6, seventh resistor-R7, eighth resistor-R8, ninth resistor-R9, tenth resistor-R10, eleventh resistor-R11, twelfth resistor-R12, first node-N1, second node-N2, third Node-N3, first switch tube-T1, second switch tube-T2, third switch tube-T3, fourth switch tube-T4, fifth switch tube-T5, sixth switch tube-T6, seventh switch tube-T7, eighth switch tube-T8, first diode-D1, second diode-D2, third diode-D3, fourth diode-D4, driving voltage terminal-VCC, ground terminal-GND, interface-PA of driving circuit, interface-MA of signal processing circuit, power supply voltage terminal-VDD, first interface-GP1, first voltage terminal-V1, second voltage terminal-V2, third voltage terminal-V3, signal receiving module-1421, pull-up module-1422, pull-down module-1423. DETAILED DESCRIPTION

[0026] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly and comprehensively understood.

[0027] The following descriptions of the embodiments are with reference to the attached diagrams to illustrate specific embodiments that the present application can be used to implement. The serial numbers for the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present application, unless otherwise specified, include direct and indirect connections (couplings). The directional terms mentioned in the present application, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "side", etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the present application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.

[0028] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances. It should be noted that the terms "first", "second", etc. in the specification, claims, and drawings of the present application are used to distinguish different objects, rather than to describe a specific order.

[0029] In addition, the terms "include", "may include", "contain", or "may include" used in the present application indicate the existence of the corresponding functions, operations, elements, etc. disclosed, and do not limit one or more other functions, operations, elements, etc. In addition, the terms "include" or "contain" indicate the existence of the corresponding features, numbers, steps, operations, elements, components, or combinations thereof disclosed in the specification, and do not exclude the existence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations thereof, and are intended to cover non-exclusive inclusions. In addition, when describing the embodiments of the present application, "may" is used to indicate "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0031] See also Figure 1 , Figure 1 A schematic diagram of the structure of a display device provided in the first embodiment of the present application. The display device 100 includes a display driving module 10 and a display panel 20, wherein the display driving module 10 is used to output a data signal to drive the display panel 20 to perform image display, wherein the display panel 20 includes a plurality of pixel units P arranged in an array, and the plurality of pixel units P arranged in an array are used to receive the data signal and emit light of corresponding brightness.

[0032] The display driving module 10 includes a timing control circuit 11, a driving circuit 12, a signal processing circuit 13 and a switching circuit 14, wherein the timing control circuit 11 is electrically connected to the driving circuit 12, and is used to control the driving circuit 12 to output a data signal to the pixel unit P, so as to control the pixel unit P to display an image. For example, the driving circuit 12 can be a gamma circuit, a data driving circuit, and a scanning driving circuit, etc. The scanning driving circuit is used to receive a clock signal from the timing control circuit and output a scanning signal to the pixel unit P according to the clock signal, so as to control the pixel unit P to receive a data signal from the data driving circuit for image display.

[0033] The switch circuit 14 is electrically connected to the timing control circuit 11, the drive circuit 12 and the signal processing circuit 13, wherein the timing control circuit 11 is used to selectively control the switch circuit 14 to be turned on or off, and the signal processing circuit 13 is electrically connected to the switch circuit 14. When the switch circuit 14 is turned on, the signal processing circuit 13 transmits instructions to the drive circuit 12 through the switch circuit, wherein the instructions are used to adjust the data parameters of the drive circuit.

[0034] In this embodiment, the signal processing circuit 13 can be a microcontroller, which is electrically connected to the timing control circuit 11 and the switch circuit 14 through a serial communication bus (Inter-Integrated Circuit, IIC) and is electrically connected to the drive circuit 12 through the switch circuit 14. When the switch circuit 14 is controlled to be turned on, the microcontroller can burn the code of the drive circuit through the IIC to adjust or rewrite the program in the drive circuit 12. When the microcontroller transmits signals through the IIC, the switch circuit 14 is controlled to be disconnected through the timing control circuit 11, thereby avoiding the action of accidentally writing code to the drive circuit 12, thereby avoiding changes in preset parameters inside the drive circuit 12, such as threshold voltage, threshold current and other parameters, thereby improving the stability of the drive circuit 12.

[0035] See also Figure 2 , Figure 2 for Figure 1 Equivalent circuit diagram of the switching circuit in .

[0036] like Figure 2As shown, the switch circuit 14 includes a control unit 141, an energy release unit 143 and a conduction unit 144, wherein the control unit 141 is electrically connected to the timing control circuit 11 and the energy release unit 143, and is electrically connected to the conduction unit 144 through the energy release unit 143, and the conduction unit 144 is electrically connected to the drive circuit 12 and the signal processing circuit 13. The control unit 141 outputs a first control signal and a second control signal to the conduction unit 144 according to the timing control circuit 11, and the conduction unit 144 is turned on under the control of the first control signal, so that the signal processing circuit 13 is electrically connected to the drive circuit 12, and the signal processing circuit 13 can burn the code to the drive circuit 12. The conduction unit 144 is cut off or disconnected under the control of the second control signal to control the signal processing circuit 13 to disconnect electrically from the drive circuit 12. When the conduction unit 144 is controlled to be cut off, the energy release unit is used to receive and release the charge in the conduction unit 144.

[0037] Specifically, the control unit 141 includes a first resistor R1, a first node N1, a second node N2, a first switch tube T1 and a second switch tube T2. The first resistor R1 is electrically connected between the timing control circuit 11 and the first node N1. The control end of the first switch tube T1 is electrically connected to the first node N1, the first end of the first switch tube T1 is electrically connected to the driving voltage end VCC, and the second end of the first switch tube T1 is electrically connected to the second node N2; the control end of the second switch tube T2 is electrically connected to the first node N1, the first end of the second switch tube T2 is electrically connected to the ground end GND, and the second end of the second switch tube T2 is electrically connected to the second node N2.

[0038] The first switch tube T1 is turned on according to the first control signal, and the driving voltage terminal VCC outputs the first control signal to the second node N2 through the first switch tube T1. The second switch tube T2 is turned on according to the second control signal, and the ground terminal GND outputs the second control signal to the second node N2 through the second switch tube T2.

[0039] The energy release unit 143 includes a second resistor R2, a third resistor R3 and a first diode D1, wherein a first end of the second resistor R2 is electrically connected to a second node N2, a second end of the second resistor R2 is electrically connected to the conduction unit 144, and the first control signal and the second control signal are transmitted to the conduction unit 144 via the second resistor R2. The cathode of the first diode D1 is electrically connected to the second node N2, the anode of the first diode D1 is electrically connected to a first end of the third resistor R3, and a second end of the third resistor R3 is electrically connected to the conduction unit 144. The first diode D1 and the third resistor R3 are used to release the charge of the conduction unit 144 when the conduction unit 144 is turned off. The first resistor R1 and the second resistor R2 are used to increase the damping on the signal transmission line to avoid ringing (high-frequency fluctuations caused by excessive signal amplitude or improper phase difference when there is a feedback loop in a circuit or system).

[0040] The conduction unit 144 includes a third switch tube T3, a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6. The control end of the third switch tube T3 is electrically connected to the second end of the second resistor R2, the first end of the third switch tube T3 is electrically connected to the interface PA of the drive circuit, the second end of the third switch tube T3 is electrically connected to the interface MA of the signal processing circuit, the third switch tube T3 is turned on under the control of the first control signal, the signal processing circuit is electrically connected to the drive circuit through the third switch tube T3, and the third switch tube T3 is turned off under the control of the second control signal.

[0041] The fourth resistor R4 is electrically connected between the control end and the second end of the third switch tube T3, the first end of the fifth resistor R5 is electrically connected to the first end of the third switch tube T3, the second end of the fifth resistor R5 is electrically connected to the power supply voltage terminal VDD, the first end of the sixth resistor R6 is electrically connected to the second end of the third switch tube T3, and the second end of the second resistor R2 is electrically connected to the power supply voltage terminal VDD.

[0042] The fourth resistor R4 is used to eliminate the parasitic capacitance between the source and drain of the third switch tube T3. The fifth resistor R5 and the sixth resistor R6 are pull-up resistors of PA and MA respectively.

[0043] When the third switch tube T3 is turned off, the charge between the gate and source of the third switch tube T3 is quickly consumed through the first diode D1 and the third resistor R3 to ensure that the third switch tube T3 can be quickly turned off, wherein the first diode D1 can effectively shorten the turn-off time of the third switch tube T3 and reduce the loss during the turn-off, and the third resistor R3 can prevent the electronic components from being damaged by excessive current when the third switch tube T3 is turned off.

[0044] In this embodiment, the control unit 141 can be electrically connected to the first interface GP1 of the timing control circuit 11, such as any GOIP interface, and the source and drain of the third switch tube T3 are electrically connected to the interface MA of the microcontroller (signal processing circuit 13) and the interface PA of the drive circuit 12, respectively. When the signal processing circuit 13 uses the AUX channel to burn the code, the timing control circuit 11 outputs a fixed high level to the first interface GP1, so that the control unit 141 outputs a first control signal, and then controls the third switch tube T3 to be turned on, so that the signal processing circuit 13 and the drive circuit 12 are electrically connected through the third switch tube T3, so that the code can be burned to the drive circuit 12. When the signal processing circuit 13 does not burn the code, the first node GP1 of the timing control circuit 11 stops outputting a high-level signal, so that the control unit 141 outputs a second control signal to the third switch tube T3 to control the third switch tube T3 to be turned off, thereby avoiding the signal processing circuit 13 from mistakenly writing the code to the drive circuit 12 when transmitting the signal. The AUX channel is used to transmit auxiliary information in the DisplayPort protocol between the DisplayPort Transmitter (DPTX) and the DisplayPort Receiver (DPRX).

[0045] See also Figure 3 , Figure 3 A schematic diagram of an equivalent circuit of a switch circuit provided in the second embodiment of the present application.

[0046] like Figure 3 As shown, the switch circuit 14 includes a control unit 141, an adjustment unit 142, an energy release unit 143 and a conduction unit 144, wherein the control unit 141 is electrically connected to the timing control circuit 11 and the adjustment unit 142, the adjustment unit 142 is electrically connected to the energy release unit 143, and is electrically connected to the conduction unit 144 through the energy release unit 143, and the conduction unit 144 is electrically connected to the drive circuit 12 and the signal processing circuit 13. The control unit 141 controls the conduction unit 144 to be turned on according to the first control signal and the second control signal output by the timing control circuit 11, so that the signal processing circuit 13 is electrically connected to the drive circuit 12, and the signal processing circuit 13 can burn the code to the drive circuit 12.

[0047] The adjustment unit 142 is used to control the conduction unit 144 to be turned on within a preset time according to the first control signal. The energy release unit 143 is used to receive the residual charge of the conduction unit 144 when the conduction unit 144 is turned off so that the conduction unit 144 is turned off within the preset time.

[0048] Specifically, the control unit 141 includes a first switch tube T1, a second switch tube T2, a first diode D1, a second diode D2, a first resistor R1, a second resistor R2 and a third resistor R3, the control end of the first switch tube T1 is electrically connected to the timing control circuit 11, the first end of the first switch tube T1 is electrically connected to the first voltage end V1, the second end of the first switch tube T1 is electrically connected to the first resistor R1 and is electrically connected to the ground end through the first resistor R1. The control end of the second switch tube T2 is electrically connected to the timing control circuit 11, the first end of the second switch tube T2 is electrically connected to the second voltage end, the second end of the second switch tube T2 is electrically connected to the second resistor R2 and is electrically connected to the ground end through the second resistor R2.

[0049] The anode of the first diode D1 is electrically connected to the second end of the first switch tube T1, the cathode of the first diode D1 is electrically connected to the first end of the third resistor R3, the anode of the second diode D2 is electrically connected to the second end of the second switch tube T2, the cathode of the second diode D2 is electrically connected to the first end of the third resistor R3, and the second end of the third resistor R3 is electrically connected to the adjustment unit 142.

[0050] When the timing control circuit 11 outputs the first control signal via the first interface GP1, the first switch tube T1 is turned on, and the first voltage end V1 sequentially outputs the first control signal to the third node N3 through the first switch tube T1, the first diode D1 and the third resistor R3. When the timing control circuit 11 outputs the second control signal, the second switch tube T2 is turned on, and the second voltage end V2 sequentially outputs the second control signal to the third node N3 through the second diode D2 and the third resistor R3.

[0051] In an exemplary embodiment, the first control signal may be a low level signal, the second control signal may be a high level signal, the first switch tube T1 may be an N-type MOS tube, and the second switch tube T2 may be a P-type MOS tube.

[0052] The adjustment unit 142 includes a signal receiving module 1421, a pull-up module 1422 and a pull-down module 1423. The signal receiving module 1421 is electrically connected to the control unit 141, the pull-up module 1422 and the pull-down module 1423. The signal receiving module 1421 is used to receive a first control signal and a second control signal. The pull-up module 1422 outputs a third control signal to the conduction unit 144 according to the first control signal to control the conduction unit 144 to be turned on. The pull-down module 1423 outputs a fourth control signal to the conduction unit 144 according to the second control signal to control the conduction unit 144 to be turned off.

[0053] Among them, the signal receiving module 1421 includes a third switch tube T3, a fourth switch tube T4, a third diode D3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a third node N3, the control end of the third switch tube T3 is electrically connected to the fourth resistor R4 and electrically connected to the third voltage end V3 via the fourth resistor R4, the first end of the third switch tube T3 is electrically connected to the control end of the fourth switch tube T4, the second end of the third switch tube T3 is electrically connected to the third node N3, the cathode of the third diode D3 is electrically connected to the third node N3, and the anode of the third diode D3 is electrically connected to the ground end.

[0054] A first end of the fourth switch tube T4 is electrically connected to the fifth resistor R5 and electrically connected to the third voltage terminal V3 via the fifth resistor R5. A second end of the fourth switch tube T4 is electrically connected to the sixth resistor R6 and electrically connected to the ground terminal via the sixth resistor R6.

[0055] The control unit 141 is electrically connected to the third node N3 and outputs the first control signal and the second control signal to the signal receiving module 1421 via the third node N3. The third switch tube T3 is turned on according to the first control signal to control the pull-up module 1422 to output the third control signal. The third switch tube T3 and the fourth switch tube T4 are turned on according to the second control signal to control the pull-down module 1423 to output the fourth control signal.

[0056] Among them, the third diode D3 is used to protect the third switch tube T3. When the voltage fluctuates in the circuit, the voltage of the third node N3 may become negative, making the current flowing through the third switch tube T3 very large. At this time, the current will flow to the third switch tube T3, thereby achieving a protective effect.

[0057] The pull-up module 1422 includes a fourth diode D4, a fifth switch tube T5, a seventh resistor R7 and an eighth resistor R8. The control end of the fifth switch tube T5 is electrically connected to the first end of the fourth switch tube T4, the first end of the fifth switch tube T5 is electrically connected to the seventh resistor R7 and is electrically connected to the third voltage end V3 via the seventh resistor R7, the second end of the fifth switch tube T5 is electrically connected to the anode of the fourth diode D4, the cathode of the fourth diode D4 is electrically connected to the first end of the eighth resistor R8, and the second end of the eighth resistor R8 is electrically connected to the energy release unit; when the fourth switch tube T4 is turned off, the fifth switch tube T5 is turned on under the control of the third voltage end V3, and the third voltage end V3 outputs a third control signal to the conduction unit 144 via the fifth switch tube T5.

[0058] The pull-down module 1423 includes a sixth switch tube T6, a control end of the sixth switch tube T6 is electrically connected to the second end of the fourth switch tube T4, a first end of the sixth switch tube T6 is electrically connected to the first end of the eighth resistor R8, and a second end of the sixth switch tube T6 is electrically connected to the ground end. When the fourth switch tube T4 is turned on, the sixth switch tube T6 is turned on, and the ground end outputs a fourth control signal to the conduction unit 144 through the sixth switch tube T6.

[0059] In this embodiment, the third switch tube T3, the fourth switch tube T4, the fifth switch tube T5 and the sixth switch tube T6 are triodes, whose control end is the base, the first end is the collector, and the second end is the emitter. When the low-level signal (the first control signal) is transmitted to the third node N3, the base voltage of the third switch tube T3 is greater than the emitter voltage, and the PN junction of the third switch tube T3 is opened. At this time, the base voltage of the third switch tube T3 will be clamped at V1+V PN At the same time, the base voltage of the fourth switch tube T4 is equal to the collector voltage of the third switch tube T3. Since the total resistance of the reverse PN junction of the third switch tube T3 plus the collector resistance is very large, the saturation current of the third switch tube T3 is very low. At this time, the third switch tube T3 can easily enter the saturation state, that is, the saturation voltage Vce is very small. At this time, Vce+V1<V PN , which is not enough to control the fourth switch tube T4 to be turned on, that is, the fourth switch tube T4 is in the cut-off state. Therefore, the collector voltage of the fifth switch tube T5 is the high level (third control signal) output by the third voltage terminal V3 to control the fifth switch tube T5 to be turned on. The third control signal is transmitted to the energy release unit 143 through the fifth switch tube T5, the fourth diode D4 and the eighth resistor R8, and then transmitted to the conduction unit 144 through the energy release unit 143.

[0060] When the high level signal (second control signal) is transmitted to the third node N3, the difference between the base voltage Vg of the third switch tube T3 and the second control signal is greater than the threshold voltage, that is, Vg-V2>V PN Therefore, the third switch tube T3 is in the on state, and the base voltage of the third switch tube T3 will be clamped at V2+V PN Since the equivalent resistance of the third switch tube T3 is large, after the third switch tube T3 enters the saturation state, the base voltage of the fourth switch tube T4 is equal to the collector voltage (V2+Vce) of the third switch tube T3. Since V2 is a high-level voltage (the second control signal), the base voltage Vg of the fourth switch tube T4 is V2+Vce>V PN, so the fourth switch tube T4 is turned on. At this time, the emitter voltage of the fourth switch tube T4 is equal to the base voltage of the sixth switch tube T6. At this time, the sixth switch tube T6 is turned on, and the ground terminal GND is electrically connected to the conduction unit 144 through the sixth switch tube T6 to output the fourth control signal to the conduction unit 144, that is, to output a low level signal to the conduction unit 144 to control the conduction unit 144 to be turned off.

[0061] At the same time, the base voltage of the fifth switch tube T5 is equal to the collector voltage of the fourth switch tube T4. Due to the existence of the fourth diode D4, the fifth switch tube T5 cannot reach the on state, so the fifth switch tube T5 is in the off state.

[0062] The energy release unit 143 includes a seventh switch tube T7, a fifth diode D5 and a ninth resistor R9, the anode of the fifth diode D5 is electrically connected to the second end of the eighth resistor R8, the anode of the fifth diode D5 is electrically connected to the conduction unit 144, the control end of the seventh switch tube T7 is electrically connected to the second end of the eighth resistor R8, the first end of the seventh switch tube T7 is electrically connected to the ninth resistor R9 and is electrically connected to the conduction unit 144 via the ninth resistor R9, and the second end of the seventh switch tube T7 is electrically connected to the ground end GND.

[0063] The conducting unit 144 includes an eighth switch tube T8, a tenth resistor R10, an eleventh resistor R11 and a twelfth resistor R12, the control end of the eighth switch tube T8 is electrically connected to the energy release unit 143, the first end of the eighth switch tube T8 is electrically connected to the drive circuit 12, the second end of the eighth switch tube T8 is electrically connected to the signal processing circuit 13, the eighth switch tube T8 is turned on under the control of the first control signal, the signal processing circuit 13 is electrically connected to the drive circuit 12 through the eighth switch tube T8, and the eighth switch tube T8 is turned off under the control of the second control signal;

[0064] The tenth resistor R10 is electrically connected between the control terminal and the second terminal of the eighth switch tube T8, the first terminal of the eleventh resistor R11 is electrically connected to the first terminal of the eighth switch tube T8, the second terminal of the eleventh resistor R11 is electrically connected to the power supply voltage terminal VDD, the first terminal of the twelfth resistor R12 is electrically connected to the second terminal of the eighth switch tube T8, and the second terminal of the second resistor is electrically connected to the power supply voltage terminal VDD.

[0065] When the eighth switch tube T8 is turned off under the control of the fourth control signal, the seventh switch tube T7 is turned on under the control of the fourth control signal to transfer the charge at the control end of the eighth switch tube T8 to the ground end GND for release, so as to accelerate the closing speed of the eighth switch tube T8.

[0066] In this embodiment, the control end of the switch tube may be a gate, the first end of the switch tube may be a source, and the second end of the switch tube may be a drain.

[0067] By controlling the conduction and disconnection of the conduction unit 144, the electrical connection between the signal processing circuit 13 and the driving circuit 12 can be effectively controlled, so that the conduction unit 144 can be turned on when the signal processing circuit 13 burns the code to the driving circuit 12, and control the signal processing circuit 13 to be disconnected from the driving circuit 12 in other cases, thereby effectively avoiding the signal processing circuit 13 from mistakenly writing code to the driving circuit 12 during signal transmission.

[0068] See also Figure 4 , Figure 4 This is a schematic diagram of an equivalent circuit of the first switching circuit provided in the third embodiment of the present application.

[0069] like Figure 4 As shown, the switching circuit 14 includes an energy release unit 143 and a conduction unit 144, the energy release unit 143 is electrically connected to the connector 15 and the conduction unit 144, the conduction unit 144 is electrically connected to the drive circuit 12 and the signal processing circuit 13, wherein the connector 15 is also electrically connected to a power supply module (not shown), when the signal processing circuit 13 needs to burn the code to the drive circuit 12, the power supply module provides a driving voltage to the connector 15, and the connector transmits the driving voltage as a control signal to the conduction unit 144 to control the conduction of the conduction unit 144, so that the signal processing circuit 13 is electrically connected to the drive circuit 12.

[0070] Specifically, the energy release unit 143 includes a seventh switch tube T7, a fifth diode D5 and a ninth resistor R9, the anode of the fifth diode D5 is electrically connected to the second end of the eighth resistor R8, the anode of the fifth diode D5 is electrically connected to the connector 15, the control end of the seventh switch tube T7 is electrically connected to the second end of the eighth resistor R8, the first end of the seventh switch tube T7 is electrically connected to the ninth resistor R9 and is electrically connected to the conduction unit 144 via the ninth resistor R9, and the second end of the seventh switch tube T7 is electrically connected to the ground end GND.

[0071] The conduction unit 144 includes an eighth switch tube T8, a tenth resistor R10, an eleventh resistor R11 and a twelfth resistor R12. The control end of the eighth switch tube T8 is electrically connected to the energy release unit 143, the first end of the eighth switch tube T8 is electrically connected to the drive circuit 12, and the second end of the eighth switch tube T8 is electrically connected to the signal processing circuit 13. The eighth switch tube T8 is turned on under the control of the control signal, and the signal processing circuit 13 is electrically connected to the drive circuit 12 through the eighth switch tube T8.

[0072] The tenth resistor R10 is electrically connected between the control terminal and the second terminal of the eighth switch tube T8, the first terminal of the eleventh resistor R11 is electrically connected to the first terminal of the eighth switch tube T8, the second terminal of the eleventh resistor R11 is electrically connected to the power supply voltage terminal VDD, the first terminal of the twelfth resistor R12 is electrically connected to the second terminal of the eighth switch tube T8, and the second terminal of the second resistor is electrically connected to the power supply voltage terminal VDD.

[0073] The eighth switch tube T8 is used to be turned on under the control of the control signal to control the signal processing circuit 13 to be electrically connected to the drive circuit 12 through the conduction 144. When the control signal stops transmitting, the eighth switch tube T8 is turned off to control the signal processing circuit 13 to be disconnected from the drive circuit 12, thereby preventing the signal processing circuit 13 from mistakenly writing codes to the drive circuit 12 during signal transmission, and is used to eliminate the problem of poor display effect caused by mistakenly writing codes.

[0074] like Figure 5 As shown, Figure 5 for Figure 4 Interface diagram of the connector.

[0075] The connector 15 includes a plurality of pins, including a first pin NC, a second pin CN2 and a third pin CN3, wherein the first pin NC, the second pin NC2 and the third pin NC3 are empty pins (NOT CONNECTED, NC). When the signal processing circuit 13 does not need to burn codes to the driving circuit 12, the control conduction unit 144 is connected to the empty pins in the connector 15 to control the eighth switch tube T8 to be in a cut-off state. When the signal processing circuit 13 needs to burn codes to the driving circuit 12, the control conduction unit 144 is connected to other pins in the connector 15 so that the driving voltage provided by the power module is transmitted to the eighth switch tube T8 to control the eighth switch tube T8 to be turned on.

[0076] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A display driving module, comprising a timing control circuit and a driving circuit, wherein the timing control circuit is electrically connected to the driving circuit and is used to control the driving circuit to output a data signal to a pixel unit in a display area to perform image display, characterized in that: The display driving module further includes a signal processing circuit and a switch circuit, wherein the switch circuit is electrically connected to the signal processing circuit, the timing control circuit and the driving circuit, wherein the timing control circuit is used to selectively control the switching circuit to be turned on or off, and the signal processing circuit is electrically connected to the switch circuit. When the switch circuit is turned on, the signal processing circuit transmits an instruction to the driving circuit through the switch circuit, wherein the instruction is used to adjust a preset parameter of the driving circuit. The switch circuit includes a control unit, an adjustment unit, an energy release unit and a conduction unit, wherein the control unit is electrically connected to the timing control circuit and the adjustment unit, the adjustment unit is electrically connected to the energy release unit and is electrically connected to the conduction unit through the energy release unit, and the conduction unit is electrically connected to the drive circuit and the signal processing circuit; The control unit is used to output a first control signal and a second control signal to the adjustment unit under the control of the timing control circuit. The adjustment unit is used to output a third control signal according to the first control signal, and output a fourth control signal according to the second control signal. The third control signal is used to control the conduction of the conduction unit to control the signal processing circuit to be electrically connected to the drive circuit. The fourth control signal is used to control the conduction unit to be cut off to control the signal processing circuit to be electrically disconnected from the drive circuit. At the same time, the energy release unit receives the charge in the conduction unit and releases the charge to the ground terminal, wherein the voltage of the third control signal is greater than the voltage of the first control signal, and the voltage of the fourth control signal is less than or equal to the voltage of the second control signal.

2. The display driving module according to claim 1, wherein: The control unit includes a first resistor, a first node, a second node, a first switch tube and a second switch tube, the first resistor is electrically connected between the timing control circuit and the first node, the control end of the first switch tube is electrically connected to the first node, the first end of the first switch tube is electrically connected to the first voltage end, and the second end of the first switch tube is electrically connected to the second node; the control end of the second switch tube is electrically connected to the first node, the first end of the second switch tube is electrically connected to the second voltage end, and the second end of the second switch tube is electrically connected to the second node; The first switch tube is turned on under the control of the timing control circuit, and the first voltage end outputs the first control signal to the second node through the first switch tube. The second switch tube is turned on under the control of the second control signal, and the second voltage end outputs the second control signal to the second node through the second switch tube.

3. The display driving module according to claim 2, characterized in that: The energy release unit includes a second resistor, a third resistor and a first diode, the first end of the second resistor is electrically connected to the second node, the second end of the second resistor is electrically connected to the conduction unit, and the first control signal and the second control signal are transmitted to the conduction unit via the second resistor; The cathode of the first diode is electrically connected to the second node, the anode of the first diode is electrically connected to the first end of the third resistor, the second end of the third resistor is electrically connected to the conduction unit, and the first diode and the third resistor are used to release the charge of the conduction unit when the conduction unit is turned off.

4. The display driving module according to claim 1, wherein: The control unit includes a first switch tube, a second switch tube, a first diode, a second diode, a first resistor, a second resistor and a third resistor, the control end of the first switch tube is electrically connected to the timing control circuit, the first end of the first switch tube is electrically connected to the first voltage end, and the second end of the first switch tube is electrically connected to the first resistor and is electrically connected to the ground end through the first resistor; The control end of the second switch tube is electrically connected to the timing control circuit, the first end of the second switch tube is electrically connected to the second voltage end, and the second end of the second switch tube is electrically connected to the second resistor and electrically connected to the ground end through the second resistor; The anode of the first diode is electrically connected to the second end of the first switch tube, the cathode of the first diode is electrically connected to the first end of the third resistor, the anode of the second diode is electrically connected to the second end of the second switch tube, the cathode of the second diode is electrically connected to the first end of the third resistor, and the second end of the third resistor is electrically connected to the adjustment unit; The first switch tube is turned on according to the first control signal to receive a first control signal from the first voltage end and transmit it to the adjustment unit through the first diode, and the second switch tube is turned on according to the second control signal to receive a second control signal from the second voltage end and transmit it to the adjustment unit through the second diode.

5. The display driving module according to claim 4, characterized in that: The adjustment unit includes a signal receiving module, a pull-up module and a pull-down module. The signal receiving module is electrically connected to the control unit, the pull-up module and the pull-down module. The signal receiving module is used to receive the first control signal and the second control signal. The pull-up module outputs a third control signal to the conduction unit according to the first control signal to control the conduction unit to be turned on. The pull-down module outputs a fourth control signal to the conduction unit according to the second control signal to control the conduction unit to be turned off.

6. The display driving module according to claim 5, characterized in that: The signal receiving module includes a third switch tube, a fourth switch tube, a third diode, a fourth resistor, a fifth resistor, a sixth resistor and a third node, the control end of the third switch tube is electrically connected to the fourth resistor and electrically connected to the third voltage end through the fourth resistor, the first end of the third switch tube is electrically connected to the control end of the fourth switch tube, the second end of the third switch tube is electrically connected to the third node, the cathode of the third diode is electrically connected to the third node, and the anode of the third diode is electrically connected to the ground end; The first end of the fourth switch tube is electrically connected to the fifth resistor and electrically connected to the third voltage end via the fifth resistor, and the second end of the fourth switch tube is electrically connected to the sixth resistor and electrically connected to the ground end via the sixth resistor; The control unit is electrically connected to the third node and outputs the first control signal and the second control signal to the signal receiving module via the third node. The third switch tube is turned on according to the first control signal to control the pull-up module to output the third control signal. The third switch tube and the fourth switch tube are turned on according to the second control signal to control the pull-down module to output the fourth control signal.

7. The display driving module according to claim 6, wherein: The pull-up module includes a fourth diode, a fifth switch tube, a seventh resistor and an eighth resistor, the control end of the fifth switch tube is electrically connected to the first end of the fourth switch tube, the first end of the fifth switch tube is electrically connected to the seventh resistor and electrically connected to the third voltage end through the seventh resistor, the second end of the fifth switch tube is electrically connected to the anode of the fourth diode, the cathode of the fourth diode is electrically connected to the first end of the eighth resistor, and the second end of the eighth resistor is electrically connected to the energy release unit, when the fourth switch tube is turned off, the fifth switch tube is turned on under the control of the third voltage end, and the third voltage end outputs a third control signal to the conduction unit through the fifth switch tube; The pull-down module includes a sixth switch tube, a control end of the sixth switch tube is electrically connected to the second end of the fourth switch tube, a first end of the sixth switch tube is electrically connected to the first end of the eighth resistor, and a second end of the sixth switch tube is electrically connected to a ground end; when the fourth switch tube is turned on, the sixth switch tube is turned on, and the ground end outputs a fourth control signal to the conduction unit through the sixth switch tube.

8. A display device, characterized in that: It comprises a display panel and a display driving module as described in any one of claims 1 to 7, wherein the display driving module is used to drive the display panel to perform image display.

Images