CN118135927B - Display driver module and display device - Google Patents
Display driver module and display device Download PDFInfo
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- CN118135927B CN118135927B CN202410458156.8A CN202410458156A CN118135927B CN 118135927 B CN118135927 B CN 118135927B CN 202410458156 A CN202410458156 A CN 202410458156A CN 118135927 B CN118135927 B CN 118135927B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
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Abstract
本申请实施例公开种显示驱动模组和显示装置，包括时序控制电路和驱动电路，时序控制电路电连接于驱动电路，用于控制驱动电路输出数据信号至显示区域中的像素单元以执行图像显示。显示驱动模组还包括信号处理电路和开关电路，开关电路电连接于信号处理电路、时序控制电路和驱动电路，时序控制电路用于选择性控制开关电路导通或断开，信号处理电路电连接于开关电路，在开关电路导通时信号处理电路通过开关电路传输指令至驱动电路，所述指令用于调整驱动电路的预设参数，通过设置开关电路并通过控制开关电路的导通与关闭，可有效避免信号处理电路误写代码至驱动电路，从而避免驱动电路内部预设参数的变化，提升驱动电路的稳定性。
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
The present application relates to the field of display technologies, and in particular, to a display driving module and a display device.
Background
In the current display driving module of the display panel, the IIC (Inter-INTEGRATED CIRCUIT) serial communication bus is not strictly differentiated between the used and unused states, the MSDA (data line) and the MSCL (clock line) are kept in a high-level state all the time, that is, pull high, and the microcontroller is also in a state of being always conducted with the IIC interfaces of other peripheral ICs. When a series of actions such as code burning or system-side operation are performed after the microcontroller is powered on, and the like occur through an AUX channel, an action of writing a code by mistake is generated due to address conflict, a hidden register or some bug, wherein the AUX channel is used for transmitting auxiliary information in a DisplayPort protocol between a DisplayPort transmitter (DisplayPort Transmitter, DPTX) and a DisplayPort receiver (DisplayPort Receiver, DPRX).
Therefore, how to avoid the code error of the driving circuit by the microcontroller is a problem to be solved.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present application provides a display driving module and a display device capable of effectively avoiding erroneous writing of codes to a driving circuit.
The application provides a display driving module, which comprises a time sequence control circuit and a driving circuit, wherein the time sequence control circuit is electrically connected with the driving circuit and is used for controlling the driving circuit to output data signals to pixel units in a display area so as to execute image display, the display driving module also comprises a signal processing circuit and a switching circuit, the switching circuit is electrically connected with the signal processing circuit, the time sequence control circuit and the driving circuit, the time sequence control circuit is used for selectively controlling the switching circuit to be switched on or off, the signal processing circuit is electrically connected with the switching circuit, and when the switching circuit is switched on, the signal processing circuit transmits instructions to the driving circuit through the switching circuit, and the instructions are used for adjusting preset parameters of the driving circuit.
The switch circuit comprises a control unit, an energy release unit and a conduction unit, wherein the control unit is electrically connected with the time sequence control circuit and the energy release unit, the energy release unit is electrically connected with the conduction unit, the conduction unit is electrically connected with the signal processing circuit and the driving circuit, the control unit is used for outputting a first control signal and a second control signal under the control of the time sequence control circuit and transmitting the first control signal and the second control signal to the conduction unit through the energy release unit, the conduction unit is conducted under the control of the first control signal to control the signal processing circuit to be electrically connected with the driving circuit, or is cut off under the control of the second control signal to control the signal processing circuit to be electrically disconnected with the driving circuit, and meanwhile, the energy release unit receives charges in the conduction unit and releases the charges to a grounding end.
Optionally, the switch circuit further includes an adjusting unit, the adjusting unit is electrically connected to the control unit and the energy release unit, the adjusting unit is configured to receive the first control signal and the second control signal from the control unit, output a third control signal according to the first control signal, the third control signal is configured to control the conducting unit to be turned on, and output a fourth control signal according to the second control signal, the fourth control signal is configured to control the conducting unit to be turned off so as to control the signal processing circuit to be electrically disconnected from the driving circuit, wherein a voltage of the third control signal is greater than a voltage of the first control signal, and a voltage of the fourth control signal is less than or equal to a voltage of the second control signal.
Optionally, the control unit includes a first resistor, a first node, a second node, a first switch tube and a second switch tube, where the first resistor is electrically connected between the timing control circuit and the first node, a control end of the first switch tube is electrically connected to the first node, a first end of the first switch tube is electrically connected to a first voltage end, a second end of the first switch tube is electrically connected to the second node, a control end of the second switch tube is electrically connected to the first node, a first end of the second switch tube is electrically connected to the second voltage end, a second end of the second switch tube is electrically connected to the second node, the first switch tube is turned on under control of the timing control circuit, the first voltage end outputs a first control signal to the second node through the first switch tube, the second switch tube is turned on under control of the second control signal, and the second voltage end outputs a second control signal to the second node through the second switch tube.
Optionally, the energy release unit includes a second resistor, a third resistor and a first diode, a first end of the second resistor is electrically connected to the second node, a second end of the second resistor is electrically connected to the conducting unit, and the first control signal and the second control signal are transmitted to the conducting unit through 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 conducting unit, and the first diode and the third resistor are used for releasing charges of the conducting unit when the conducting unit is turned off.
Optionally, the control unit comprises a first switch tube, a second switch tube, a first diode, a second diode, a first resistor, a second resistor and a third resistor, wherein the control end of the first switch tube is electrically connected with the time sequence control circuit, the first end of the first switch tube is electrically connected with the first voltage end, the second end of the first switch tube is electrically connected with the first resistor and is electrically connected with the ground end through the first resistor, the control end of the second switch tube is electrically connected with the time sequence control circuit, the first end of the second switch tube is electrically connected with the second voltage end, the second end of the second switch tube is electrically connected with the second resistor and is electrically connected with the ground end through the second resistor, the anode of the first diode is electrically connected with the first end of the third resistor, the anode of the second diode is electrically connected with the second end of the second switch tube, the cathode of the second diode is electrically connected with the first end of the third resistor, the second end of the third resistor is electrically connected with the adjusting unit, the second end of the second switch tube is electrically connected with the adjusting unit, the second switch tube is electrically connected with the first diode and is connected with the first diode according to the first voltage, and the second signal is transmitted to the first voltage and adjusted unit through the first diode and the second voltage.
Optionally, the adjusting 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 for receiving 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 conduct, 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 turn off.
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, wherein the control end of the third switch tube is electrically connected to the fourth resistor and is 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, 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 is electrically connected to the third voltage end through the fifth resistor, the second end of the fourth switch tube is electrically connected to the sixth resistor and is electrically connected to the ground end through the sixth resistor, the control unit is electrically connected to the third node and is electrically connected to the third node through the third node to output a first control signal and a second control signal to the signal receiving module, the third switch tube is turned on according to the first control signal to control the pull-up module, and the third switch tube and the fourth switch tube is turned on according to the fourth control signal.
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 is 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, 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 comprises a sixth switching tube, wherein the control end of the sixth switching tube is electrically connected with the second end of the fourth switching tube, the first end of the sixth switching tube is electrically connected with the first end of the eighth resistor, the second end of the sixth switching tube is electrically connected with the grounding end, and when the fourth switching tube is conducted, the sixth switching tube is conducted, and the grounding end outputs a fourth control signal to the conducting unit through the sixth switching tube.
Optionally, the energy release unit includes a seventh switch tube, a fifth diode and a ninth resistor, an anode of the fifth diode is electrically connected to a second end of the eighth resistor, an anode of the fifth diode is electrically connected to the conducting unit, a control end of the seventh switch tube is electrically connected to a second end of the eighth resistor, a first end of the seventh switch tube is electrically connected to the ninth resistor and is electrically connected to the conducting unit through the ninth resistor, and a second end of the seventh switch tube is electrically connected to the ground.
Optionally, the conducting unit includes an eighth switching tube, a tenth resistor, an eleventh resistor and a twelfth resistor, the control end of the eighth switching tube is electrically connected to the energy releasing unit, the first end of the eighth switching tube is electrically connected to the driving circuit, the second end of the eighth switching tube is electrically connected to the signal processing circuit, the eighth switching tube is conducted under the control of the first control signal, the signal processing circuit is electrically connected to the driving circuit through the eighth switching tube, the eighth switching tube is turned off under the control of the second control signal, the tenth resistor is electrically connected between the control end and the second end of the eighth switching tube, the first end of the eleventh resistor is electrically connected to the first end of the eighth switching tube, the second end of the eleventh resistor is electrically connected to the power voltage end, the first end of the twelfth resistor is electrically connected to the second end of the eighth switching tube, and the second end of the second resistor is electrically connected to the power voltage end.
The embodiment of the application also provides a display device which comprises a display panel and the display driving module, wherein the display driving module is used for driving the display panel to execute image display.
Compared with the prior art, the embodiment of the application has the advantages that the switch circuit is arranged between the signal processing circuit and the driving circuit, so that the signal processing circuit can transmit the instruction to the driving circuit through the switch circuit when the switch circuit is conducted, the data parameters of the driving circuit are adjusted, and the error writing of codes to the driving circuit when the signal processing circuit outputs signals is avoided when the switch circuit is controlled to be electrically disconnected, thereby avoiding the change of preset parameters in the driving circuit and improving the stability of the driving circuit.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a display device according to a first embodiment of the present application;
FIG. 2 is a schematic diagram of an equivalent circuit of the switch circuit of FIG. 1;
fig. 3 is an equivalent circuit schematic diagram of a switching circuit according to a second embodiment of the present application;
Fig. 4 is an equivalent circuit schematic diagram of a first switching circuit according to a third embodiment of the present application;
Fig. 5 is an interface schematic of the connector of fig. 4.
Reference numerals illustrate: 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, turn-on 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, third node-N2, fourth resistor-R the switching device comprises a first switching tube-T1, a second switching tube-T2, a third switching tube-T3, a fourth switching tube-T4, a fifth switching tube-T5, a sixth switching tube-T6, a seventh switching tube-T7, an eighth switching tube-T8, a first diode-D1, a second diode-D2, a third diode-D3, a fourth diode-D4, a driving voltage end-VCC, a grounding end-GND, an interface-PA of a driving circuit, an interface-MA of a signal processing circuit, a power voltage end-VDD, a first interface-GP 1, a first voltage end-V1, a second voltage end-V2, a third voltage end-V3, a signal receiving module-1421, a pull-up module-1422 and a pull-down module-1423.
Detailed Description
In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the application. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
The following description of the embodiments refers to the accompanying drawings, which illustrate specific embodiments in which the application may be practiced. The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The term "coupled" as used herein includes both direct and indirect coupling (coupling), unless otherwise indicated. Directional terms, such as "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "side", etc., in the present application are merely referring to the directions of the attached drawings, and thus, directional terms are used for better, more clear explanation and understanding of the present application, rather than indicating or implying that the apparatus or element being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application.
In the description of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, directly connected, indirectly connected via an intermediate medium, or in communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art. It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and in the drawings are used for distinguishing between different objects and not for describing a particular sequential order.
Furthermore, the terms "comprises," "comprising," "includes," "including," or "having," when used in this specification, are intended to specify the presence of stated features, operations, elements, etc., but do not limit the presence of one or more other features, operations, elements, etc., but are not limited to other features, operations, elements, etc. Furthermore, the terms "comprises" or "comprising" mean that there is a corresponding feature, number, step, operation, element, component, or combination thereof disclosed in the specification, and that there is no intention to exclude the presence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations thereof. Furthermore, when describing embodiments of the application, use of "may" means "one or more embodiments of the application. Also, the term "exemplary" is intended to refer to an example or illustration.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a display device according to a 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 configured to output a data signal to drive the display panel 20 to perform image display, and the display panel 20 includes a plurality of pixel units P arranged in an array, where the plurality of pixel units P arranged in an array are configured to receive the data signal and emit light with corresponding brightness.
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 for controlling 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, and for example, the driving circuit 12 may be a gamma circuit, a data driving circuit, a scan driving circuit, etc., and the scan driving circuit is used for receiving a clock signal from the timing control circuit and outputting a scan signal to the pixel unit P according to the clock signal so as to control the pixel unit P to receive the data signal from the data driving circuit to display an image.
The switch circuit 14 is electrically connected to the timing control circuit 11, the driving circuit 12 and the signal processing circuit 13, wherein the timing control circuit 11 is used for selectively controlling the switch circuit 14 to be turned on or turned off, the signal processing circuit 13 is electrically connected to the switch circuit 14, and the signal processing circuit 13 transmits an instruction to the driving circuit 12 through the switch circuit when the switch circuit 14 is turned on, wherein the instruction is used for adjusting a data parameter of the driving circuit.
In this embodiment, the signal processing circuit 13 may 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 driving circuit 12 through the switch circuit 14, when the switch circuit 14 is controlled to be turned on, the microcontroller can burn codes into the driving circuit through the IIC for adjusting or rewriting a program in the driving circuit 12, when the microcontroller performs signal transmission through the IIC, the switch circuit 14 is controlled to be turned off through the timing control circuit 11, so that a code error writing action on the driving circuit 12 can be avoided, and thus, a change of preset parameters in the driving circuit 12, such as a threshold voltage, a threshold current, etc. is avoided, and stability of the driving circuit 12 is improved.
Referring to fig. 2, fig. 2 is an equivalent circuit schematic diagram of the switch circuit in fig. 1.
As shown in fig. 2, the switching 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 driving circuit 12 and the signal processing circuit 13. The control unit 141 outputs a first control signal and a second control signal to the conducting unit 144 according to the timing control circuit 11, and the conducting unit 144 conducts under the control of the first control signal, so that the signal processing circuit 13 is electrically connected to the driving circuit 12, and the signal processing circuit 13 can perform code burning on the driving circuit 12. The turn-on unit 144 is turned off, i.e., disconnected, under the control of the second control signal to control the signal processing circuit 13 to be electrically disconnected from the driving circuit 12. The energy discharging unit is used for receiving and discharging the electric charges in the turn-on unit 144 when the turn-on unit 144 is controlled to be turned off.
Specifically, the control unit 141 includes a first resistor R1, a first node N1, a second node N2, a first switching tube T1 and a second switching tube T2, where the first resistor R1 is electrically connected between the timing control circuit 11 and the first node N1, a control end of the first switching tube T1 is electrically connected to the first node N1, a first end of the first switching tube T1 is electrically connected to the driving voltage end VCC, a second end of the first switching tube T1 is electrically connected to the second node N2, a control end of the second switching tube T2 is electrically connected to the first node N1, a first end of the second switching tube T2 is electrically connected to the ground end GND, and a second end of the second switching tube T2 is electrically connected to the second node N2.
The first switch tube T1 is turned on according to the first control signal, 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.
The energy release unit 143 includes a second resistor R2, a third resistor R3, and a first diode D1, a first end of the second resistor R2 is electrically connected to the second node N2, a second end of the second resistor R2 is electrically connected to the conducting unit 144, and the first control signal and the second control signal are transmitted to the conducting unit 144 through 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 the first end of the third resistor R3, the second end of the third resistor R3 is electrically connected to the conducting unit 144, and the first diode D1 and the third resistor R3 are used for releasing the charge of the conducting unit 144 when the conducting unit 144 is turned off. The first resistor R1 and the second resistor R2 are used for increasing damping on the signal transmission line and avoiding ringing (high-frequency fluctuation caused by overlarge signal amplitude or improper phase difference when a feedback loop exists in a circuit or a system).
The conducting unit 144 includes a third switching tube T3, a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6, a control end of the third switching tube T3 is electrically connected to a second end of the second resistor R2, a first end of the third switching tube T3 is electrically connected to an interface PA of the driving circuit, a second end of the third switching tube T3 is electrically connected to an interface MA of the signal processing circuit, the third switching tube T3 is conducted under the control of the first control signal, the signal processing circuit is electrically connected to the driving circuit through the third switching tube T3, and the third switching tube T3 is turned off under the control of the second control signal.
The fourth resistor R4 is electrically connected between the control end and the second end of the third switching tube T3, the first end of the fifth resistor R5 is electrically connected to the first end of the third switching tube T3, the second end of the fifth resistor R5 is electrically connected to the power voltage end VDD, the first end of the sixth resistor R6 is electrically connected to the second end of the third switching tube T3, and the second end of the second resistor R2 is electrically connected to the power voltage end VDD.
The fourth resistor R4 is used for eliminating parasitic capacitance between the source and the drain of the third switching tube T3, and the fifth resistor R5 and the sixth resistor R6 are pull-up resistors of PA and MA, respectively.
When the third switching tube T3 is turned off, the charge between the gate and the source of the third switching tube T3 is rapidly consumed through the first diode D1 and the third resistor R3, so as to ensure that the third switching tube T3 can be turned off rapidly, wherein the first diode D1 can effectively shorten the turn-off time of the third switching tube T3, reduce the loss during turn-off, and the third resistor R3 can prevent the electronic component from being damaged due to excessive current during turn-off of the third switching tube T3.
In this embodiment, the control unit 141 may be electrically connected to the first interface GP1 of the timing control circuit 11, for example, any one of the GOIP interfaces, and the source and drain of the third switching tube T3 are electrically connected to the interface MA of the microcontroller (the signal processing circuit 13) and the interface PA of the driving circuit 12, respectively, when the signal processing circuit 13 performs code burning by using the AUX channel, 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 further controls the third switching tube T3 to be turned on, so that the signal processing circuit 13 and the driving circuit 12 are electrically connected through the third switching tube T3, thereby performing code burning on the driving circuit 12. When the signal processing circuit 13 does not perform the code burning, the first node GP1 of the timing control circuit 11 stops outputting the high level signal, so that the control unit 141 outputs the second control signal to the third switching tube T3 to control the third switching tube T3 to be turned off, thereby avoiding erroneous writing of the code to the driving circuit 12 when the signal processing circuit 13 transmits the signal. The AUX channel is used for transmitting auxiliary information in DisplayPort protocol between a DisplayPort transmitter (DisplayPort Transmitter, DPTX) and a DisplayPort receiver (DisplayPort Receiver, DPRX).
Referring to fig. 3, fig. 3 is an equivalent circuit schematic diagram of a switching circuit according to a second embodiment of the present application.
As shown in fig. 3, the switch circuit 14 includes a control unit 141, an adjustment unit 142, an energy release unit 143, and a conducting 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 conducting unit 144 through the energy release unit 143, and the conducting unit 144 is electrically connected to the driving circuit 12 and the signal processing circuit 13. The control unit 141 controls the conduction unit 144 to conduct 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 driving circuit 12, and the signal processing circuit 13 can perform code burning on the driving circuit 12.
The adjusting unit 142 is configured to control the conducting unit 144 to be turned on within a preset time according to the first control signal, and the energy releasing unit 143 is configured to receive the residual charge of the conducting unit 144 when the conducting unit 144 is turned off so that the conducting unit 144 is turned off within the preset time.
Specifically, the control unit 141 includes a first switching tube T1, a second switching tube T2, a first diode D1, a second diode D2, a first resistor R1, a second resistor R2, and a third resistor R3, where a control end of the first switching tube T1 is electrically connected to the timing control circuit 11, a first end of the first switching tube T1 is electrically connected to the first voltage end V1, and a second end of the first switching tube T1 is electrically connected to the first resistor R1 and to a ground end through the first resistor R1. The control end of the second switching tube T2 is electrically connected to the timing control circuit 11, the first end of the second switching tube T2 is electrically connected to the second voltage end, and the second end of the second switching tube T2 is electrically connected to the second resistor R2 and is electrically connected to the ground end through the second resistor R2.
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 adjusting unit 142.
When the timing control circuit 11 outputs a first control signal through the first interface GP1, the first switching tube T1 is turned on, the first voltage terminal V1 sequentially outputs a first control signal to the third node N3 through the first switching tube T1, the first diode D1 and the third resistor R3, and when the timing control circuit 11 outputs a second control signal, the second switching tube T2 is turned on, and the second voltage terminal V2 sequentially outputs a second control signal to the third node N3 through the second diode D2 and the third resistor R3.
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 switching tube T1 may be an N-type MOS tube, and the second switching tube T2 may be a P-type MOS tube.
The adjusting unit 142 includes a signal receiving module 1421, a pull-up module 1422, and a pull-down module 1423, where the signal receiving module 1421 is electrically connected to the control unit 141, the pull-up module 1422, and the pull-down module 1423, and the signal receiving module 1421 is configured to receive the first control signal and the second control signal, the pull-up module 1422 outputs a third control signal to the conducting unit 144 according to the first control signal to control the conducting unit 144 to conduct, and the pull-down module 1423 outputs a fourth control signal to the conducting unit 144 according to the second control signal to control the conducting unit 144 to turn off.
The signal receiving module 1421 includes a third switching tube T3, a fourth switching tube T4, a third diode D3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a third node N3, where a control end of the third switching tube T3 is electrically connected to the fourth resistor R4 and is electrically connected to the third voltage end V3 via the fourth resistor R4, a first end of the third switching tube T3 is electrically connected to the control end of the fourth switching tube T4, a second end of the third switching tube T3 is electrically connected to the third node N3, a cathode of the third diode D3 is electrically connected to the third node N3, and an anode of the third diode D3 is electrically connected to the ground end.
The first end of the fourth switching tube T4 is electrically connected to the fifth resistor R5 and to the third voltage terminal V3 via the fifth resistor R5, and the second end of the fourth switching tube T4 is electrically connected to the sixth resistor R6 and to the ground terminal via the sixth resistor R6.
The control unit 141 is electrically connected to the third node N3 and outputs a first control signal and a second control signal to the signal receiving module 1421 via the third node N3, the third switching tube T3 is turned on according to the first control signal to control the pull-up module 1422 to output a third control signal, and the third switching tube T3 and the fourth switching tube T4 are turned on according to the second control signal to control the pull-down module 1423 to output a fourth control signal.
The third diode D3 is used for protecting the third switching tube T3, and when voltage fluctuation occurs in the circuit, a negative voltage may occur at the third node N3, so that a current flowing through the third switching tube T3 is very large, and the current flows to the third switching tube T3, thereby achieving the protection function.
The pull-up module 1422 includes a fourth diode D4, a fifth switch tube T5, a seventh resistor R7, and an eighth resistor R8, where 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, the second end of the eighth resistor R8 is electrically connected to the energy release unit, and 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 turn-on unit 144 via the fifth switch tube T5.
The pull-down module 1423 includes a sixth switching tube T6, where a control end of the sixth switching tube T6 is electrically connected to a second end of the fourth switching tube T4, a first end of the sixth switching tube T6 is electrically connected to a first end of the eighth resistor R8, and a second end of the sixth switching tube T6 is electrically connected to a ground end. When the fourth switching tube T4 is turned on, the sixth switching tube T6 is turned on, and the ground terminal outputs a fourth control signal to the turn-on unit 144 through the sixth switching tube T6.
In this embodiment, the third switching tube T3, the fourth switching tube T4, the fifth switching tube T5 and the sixth switching tube T6 are transistors, the control end is a base stage, the first end is a collector, and the second end is an emitter, when the low-level signal (the first control signal) is transmitted to the third node N3, the base voltage of the third switching tube T3 is greater than the emitter voltage, the PN junction of the third switching tube T3 is turned on, at this time, the base voltage of the third switching tube T3 is clamped to v1+v PN, at the same time, the base voltage of the fourth switching tube T4 is equal to the collector voltage of the third switching tube T3, and since the total resistance value of the reverse PN junction of the third switching tube T3 plus the collector resistance is very large, the saturated current of the third switching tube T3 is very low, at this time, the third switching tube T3 is very easy to enter the saturated state, i.e. the saturated voltage Vce is very small, vce+v1v PN is insufficient to control the fourth switching tube T4 to be turned on, i.e. the fourth switching tube T4 is in the turned off state. Therefore, the collector voltage of the fifth switching tube T5 is at a high level (third control signal) output by the third voltage terminal V3 to control the fifth switching tube T5 to be turned on, and the third control signal is transmitted to the energy release unit 143 via the fifth switching tube T5, the fourth diode D4 and the eighth resistor R8 and is transmitted to the turn-on unit 144 via the energy release unit 143.
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 switching tube T3 and the second control signal is greater than the threshold voltage, that is, vg-V2> V PN, so that the third switching tube T3 is in the on state, the base voltage of the third switching tube T3 is clamped at v2+v PN, since the equivalent resistance of the third switching tube T3 is large, the base voltage of the fourth switching tube T4 is equal to the collector voltage (v2+vce) of the third switching tube T3 after the third switching tube T3 enters the saturated state, and since V2 is the high level voltage (second control signal), the base voltage vg=v2+vce of the fourth switching tube T4 is greater than V PN, the fourth switching tube T4 is turned on, at this time, the emitter voltage of the fourth switching tube T4 is equal to the base voltage of the sixth switching tube T6, at this time, the sixth switching tube T6 is electrically connected to the on unit 144 via the sixth switching tube T6, so that the base voltage of the fourth switching tube T4 is equal to the collector voltage (v2+vce) is equal to the collector voltage of the third switching tube T3, and the fourth switching tube T4 is turned on unit 144 is turned off, that the fourth control signal 144 is turned off, that is turned on to the low level signal 144 is turned on.
Meanwhile, the base voltage of the fifth switching tube T5 is equal to the collector voltage of the fourth switching tube T4, and the fifth switching tube T5 still cannot reach the on state due to the existence of the fourth diode D4, so that the fifth switching tube T5 is in the off state.
The energy release unit 143 includes a seventh switching tube T7, a fifth diode D5 and a ninth resistor R9, wherein an anode of the fifth diode D5 is electrically connected to a second end of the eighth resistor R8, an anode of the fifth diode D5 is electrically connected to the conducting unit 144, a control end of the seventh switching tube T7 is electrically connected to a second end of the eighth resistor R8, a first end of the seventh switching tube T7 is electrically connected to the ninth resistor R9 and is electrically connected to the conducting unit 144 via the ninth resistor R9, and a second end of the seventh switching tube T7 is electrically connected to the ground GND.
The conducting unit 144 includes an eighth switching tube T8, a tenth resistor R10, an eleventh resistor R11, and a twelfth resistor R12, the control end of the eighth switching tube T8 is electrically connected to the energy releasing unit 143, the first end of the eighth switching tube T8 is electrically connected to the driving circuit 12, the second end of the eighth switching tube T8 is electrically connected to the signal processing circuit 13, the eighth switching tube T8 is turned on under the control of the first control signal, the signal processing circuit 13 is electrically connected to the driving circuit 12 through the eighth switching tube T8, and the eighth switching tube T8 is turned off under the control of the second control signal;
The tenth resistor R10 is electrically connected between the control end and the second end of the eighth switching tube T8, the first end of the eleventh resistor R11 is electrically connected to the first end of the eighth switching tube T8, the second end of the eleventh resistor R11 is electrically connected to the power voltage terminal VDD, the first end of the twelfth resistor R12 is electrically connected to the second end of the eighth switching tube T8, and the second end of the second resistor is electrically connected to the power voltage terminal VDD.
When the eighth switching tube T8 is turned off under the control of the fourth control signal, the seventh switching tube T7 is turned on under the control of the fourth control signal to transfer the charge of the control terminal of the eighth switching tube T8 to the ground GND for releasing, so as to accelerate the turn-off speed of the eighth switching tube T8.
In this embodiment, the control end of the switching tube may be a gate, the first end of the switching tube may be a source, and the second end of the switching tube may be a drain.
The electrical connection condition between the signal processing circuit 13 and the driving circuit 12 can be effectively controlled by controlling the on/off of the on unit 144, so that the on unit 144 can be turned on when the signal processing circuit 13 burns codes on the driving circuit 12, and otherwise, the signal processing circuit 13 is controlled to be disconnected from the driving circuit 12, thereby effectively avoiding the error writing codes to the driving circuit 12 when the signal processing circuit 13 transmits signals.
Referring to fig. 4, fig. 4 is an equivalent circuit schematic diagram of a first switching circuit according to a third embodiment of the present application.
As shown in fig. 4, the switch circuit 14 includes an energy releasing unit 143 and a conducting unit 144, the energy releasing unit 143 is electrically connected to the connector 15 and the conducting unit 144, the conducting unit 144 is electrically connected to the driving circuit 12 and the signal processing circuit 13, wherein the connector 15 is further electrically connected to a power module (not shown), when the signal processing circuit 13 needs to perform code burning on the driving circuit 12, a driving voltage is provided to the connector 15 by the power module, and the connector transmits the driving voltage as a control signal to the conducting unit 144 to control the conducting unit 144 to conduct, so that the signal processing circuit 13 is electrically connected to the driving circuit 12.
Specifically, the energy release unit 143 includes a seventh switching 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 switching tube T7 is electrically connected to the second end of the eighth resistor R8, the first end of the seventh switching tube T7 is electrically connected to the ninth resistor R9 and is electrically connected to the conducting unit 144 via the ninth resistor R9, and the second end of the seventh switching tube T7 is electrically connected to the ground GND.
The conducting unit 144 includes an eighth switching tube T8, a tenth resistor R10, an eleventh resistor R11, and a twelfth resistor R12, the control end of the eighth switching tube T8 is electrically connected to the energy releasing unit 143, the first end of the eighth switching tube T8 is electrically connected to the driving circuit 12, the second end of the eighth switching tube T8 is electrically connected to the signal processing circuit 13, the eighth switching tube T8 is conducted under the control of the control signal, and the signal processing circuit 13 is electrically connected to the driving circuit 12 through the eighth switching tube T8.
The tenth resistor R10 is electrically connected between the control end and the second end of the eighth switching tube T8, the first end of the eleventh resistor R11 is electrically connected to the first end of the eighth switching tube T8, the second end of the eleventh resistor R11 is electrically connected to the power voltage terminal VDD, the first end of the twelfth resistor R12 is electrically connected to the second end of the eighth switching tube T8, and the second end of the second resistor is electrically connected to the power voltage terminal VDD.
The eighth switching tube T8 is configured to be turned on under the control of the control signal, so as to control the signal processing circuit 13 to be electrically connected to the driving circuit 12 through the turn-on 144, and when the control signal stops being transmitted, the eighth switching tube T8 is turned off, so as to control the signal processing circuit 13 to be disconnected from the driving circuit 12, thereby avoiding the problem that the display effect is poor due to the error writing code when the signal processing circuit 13 is transmitting signals to the driving circuit 12.
As shown in fig. 5, fig. 5 is an interface schematic of the connector of fig. 4.
The connector 15 includes a plurality of pins including a first pin NC, a second pin CN2, and a third pin CN3, where 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 a code for the driving circuit 12, the control conducting unit 144 is CONNECTED to the empty pins in the connector 15 to control the eighth switching tube T8 to be in an off state, and when the signal processing circuit 13 needs to burn a code for the driving circuit 12, the control conducting unit 144 is CONNECTED to other pins in the connector 15 to enable a driving voltage provided by the power module to be transmitted to the eighth switching tube T8 to control the eighth switching tube T8 to be conducted.
It is to be understood that the invention is not limited in its application to the examples described above, but is capable of modification and variation in light of the above teachings by those skilled in the art, and that all such modifications and variations are intended to be included within the scope of the appended claims.
Claims (8)
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| CN112019011A (en) * | 2019-05-31 | 2020-12-01 | 群光电能科技股份有限公司 | Soft start control circuit |
| CN212411554U (en) * | 2020-07-28 | 2021-01-26 | 京东方科技集团股份有限公司 | Display panel and display device |
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| JP2002055823A (en) * | 2000-08-09 | 2002-02-20 | Murata Mach Ltd | Electronic circuit board and recording medium |
| JP2002183700A (en) * | 2001-10-12 | 2002-06-28 | Sony Corp | Memory card, control device, data processing system and data processing method |
| CN101493771A (en) * | 2008-01-25 | 2009-07-29 | 华夏龙晖（北京）汽车电子科技有限公司 | Electric-controlled unit program burn writing equipment and method |
| CN106971108A (en) * | 2017-03-20 | 2017-07-21 | 郑州云海信息技术有限公司 | A kind of system and method for online updating BIOS ROM write-protects |
| CN109493894A (en) * | 2018-11-06 | 2019-03-19 | 惠科股份有限公司 | Protection circuit of memory cell in display panel, display panel and display device |
| CN116168624A (en) * | 2022-12-20 | 2023-05-26 | 茂佳科技(广东)有限公司 | A T-CON Less point screen board, point screen device and method |
| CN117318684B (en) * | 2023-11-30 | 2024-05-07 | 深圳青铜剑技术有限公司 | Shutdown circuit and electronic device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112019011A (en) * | 2019-05-31 | 2020-12-01 | 群光电能科技股份有限公司 | Soft start control circuit |
| CN212411554U (en) * | 2020-07-28 | 2021-01-26 | 京东方科技集团股份有限公司 | Display panel and display device |
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