WO2020093482A1 - 防护电路及显示驱动装置 - Google Patents

防护电路及显示驱动装置 Download PDF

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Publication number
WO2020093482A1
WO2020093482A1 PCT/CN2018/118011 CN2018118011W WO2020093482A1 WO 2020093482 A1 WO2020093482 A1 WO 2020093482A1 CN 2018118011 W CN2018118011 W CN 2018118011W WO 2020093482 A1 WO2020093482 A1 WO 2020093482A1
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WIPO (PCT)
Prior art keywords
circuit
voltage
controlled
controlled switch
switch circuit
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PCT/CN2018/118011
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English (en)
French (fr)
Inventor
黄笑宇
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惠科股份有限公司
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Priority to US17/043,872 priority Critical patent/US11355917B2/en
Publication of WO2020093482A1 publication Critical patent/WO2020093482A1/zh

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
    • H02H3/202—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage for dc systems
    • 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
    • G09G3/34—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 by control of light from an independent source
    • G09G3/36—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 by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3696—Generation of voltages supplied to electrode drivers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
    • H02H9/025—Current limitation using field effect transistors
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/04—Display protection
    • 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
    • G09G3/34—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 by control of light from an independent source
    • G09G3/36—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 by control of light from an independent source using liquid crystals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers

Definitions

  • the present application relates to the technical field of liquid crystal display equipment, in particular to a protection circuit and a display driving device.
  • the liquid crystal display panel is a display device composed of a certain number of color or black and white pixels and placed in front of a light source or a reflective surface.
  • TFT-LCD Thin Film Transistor Liquid Crystal Display
  • the system motherboard connects the R / G / B compressed signal, control signal and power supply to the connector on the PCB through the wire, and the data passes through the TCON (Timing Controller) on the PCB.
  • the IC processing After the IC processing, it is connected to the display area through the PCB board through S-COF (Source-Chip on Film Source Film Driver Chip) and G-COF (Gate-Chip on Film Film Driver Chip), through the display array Data line and Scan line transmit voltage, so that TFT-LCD realizes display function. That is to say, in the liquid crystal display panel, the logic signal input at the front end needs to be converted into a driving signal through the corresponding driving chip.
  • S-COF Source-Chip on Film Source Film Driver Chip
  • G-COF Gate-Chip on Film Film Driver Chip
  • EOS Electro Mechanical Over Stress
  • a protection circuit and a display driving device are provided.
  • a protection circuit includes a controlled switching circuit, a voltage threshold circuit and a voltage clamping circuit
  • the input terminal of the controlled switch circuit is set to access a logic signal, the output terminal of the controlled switch circuit is set to an input terminal connected to a driver chip, and the controlled terminal of the controlled switch circuit passes through the voltage threshold circuit Connected to the output of the controlled switch circuit;
  • the controlled end of the controlled switch circuit is also set to be grounded through the voltage clamping circuit;
  • the voltage threshold circuit is configured to be turned on when the output voltage of the controlled switch circuit is greater than the first preset voltage
  • the controlled switch circuit is configured to turn off the input end and the output end of the voltage threshold circuit when it is turned on.
  • the output voltage of the controlled switch circuit when an electrical overstress problem occurs in the logic signal, the output voltage of the controlled switch circuit will be greater than the first preset voltage, so that the voltage threshold circuit is turned on, so that the controlled switch circuit turns off its input terminal and The output end prevents electrical overstress from affecting the driver chip and causing damage to the driver chip.
  • the voltage potential of the controlled terminal of the controlled switching circuit is clamped by the voltage clamping circuit to stabilize the operating characteristics of the controlled switching circuit.
  • it further includes a pre-threshold circuit
  • the output end of the controlled switch circuit is set to be grounded through the pre-threshold circuit
  • the pre-threshold circuit is configured to be turned on when the output voltage of the controlled switch circuit is greater than a second preset voltage; the first preset voltage is greater than the second preset voltage.
  • the controlled switching circuit includes an electronic switch or a field effect transistor.
  • the field effect transistor includes a P-channel field effect transistor.
  • the voltage threshold circuit includes a first Zener diode
  • the anode of the first zener diode is connected to the controlled end of the controlled switching circuit, and the cathode of the first zener diode is connected to the output end of the controlled switching circuit.
  • the pre-threshold circuit includes a second Zener diode
  • the anode of the second zener diode is set to ground, and the cathode of the second zener diode is connected to the output of the controlled switching circuit.
  • the voltage clamping circuit includes a clamping resistor.
  • it further includes a protection resistor
  • the anode of the second voltage stabilizing diode is grounded through the protection resistor.
  • it further includes a bias resistor
  • the gate of the P-channel field effect transistor is connected to the source of the P-channel field effect transistor through the bias resistor.
  • a driving device including a driving chip and a protection circuit
  • the protection circuit includes a controlled switching circuit, a voltage threshold circuit and a voltage clamping circuit
  • the input terminal of the controlled switch circuit is configured to access a logic signal
  • the output terminal of the controlled switch circuit is configured to be connected to the input terminal of the driving chip
  • the controlled terminal of the controlled switch circuit passes the voltage A threshold circuit connected to the output of the controlled switch circuit
  • the controlled end of the controlled switch circuit is also set to be grounded through the voltage clamping circuit;
  • the voltage threshold circuit is configured to be turned on when the output voltage of the controlled switch circuit is greater than the first preset voltage
  • the controlled switch circuit is configured to turn off the input end and the output end of the voltage threshold circuit when it is turned on;
  • the output end of the driving chip is configured to output a driving signal to the display array of the liquid crystal display panel.
  • the output voltage of the controlled switch circuit when the logic signal has electrical overstress, the output voltage of the controlled switch circuit will be greater than the first preset voltage, so that the voltage threshold circuit is turned on, so that the controlled switch circuit turns off the input terminal The output end prevents electrical overstress from affecting the driver chip and causing damage to the driver chip. At the same time, the voltage potential of the controlled terminal of the controlled switching circuit is clamped by the voltage clamping circuit to stabilize the operating characteristics of the controlled switching circuit.
  • the protection circuit further includes a pre-threshold circuit
  • the output end of the controlled switch circuit is set to be grounded through the pre-threshold circuit
  • the pre-threshold circuit is configured to be turned on when the output voltage of the controlled switch circuit is greater than a second preset voltage; the first preset voltage is greater than the second preset voltage.
  • the controlled switching circuit includes an electronic switch or a field effect transistor.
  • the field effect transistor includes a P-channel field effect transistor.
  • the voltage threshold circuit includes a first Zener diode
  • the anode of the first zener diode is connected to the controlled end of the controlled switching circuit, and the cathode of the first zener diode is connected to the output end of the controlled switching circuit.
  • the pre-threshold circuit includes a second Zener diode
  • the anode of the second zener diode is set to ground, and the cathode of the second zener diode is connected to the output of the controlled switching circuit.
  • the voltage clamping circuit includes a clamping resistor.
  • it further includes a protection resistor
  • the anode of the second voltage stabilizing diode is grounded through the protection resistor.
  • it further includes a bias resistor
  • the gate of the P-channel field effect transistor is connected to the source of the P-channel field effect transistor through the bias resistor.
  • a display device includes a display module and a driving device
  • the driving device includes a driving chip and a protection circuit
  • the protection circuit includes a controlled switching circuit, a voltage threshold circuit and a voltage clamping circuit
  • the input terminal of the controlled switch circuit is configured to access a logic signal
  • the output terminal of the controlled switch circuit is configured to be connected to the input terminal of the driving chip
  • the controlled terminal of the controlled switch circuit passes the voltage A threshold circuit connected to the output of the controlled switch circuit
  • the controlled end of the controlled switch circuit is also set to be grounded through the voltage clamping circuit;
  • the voltage threshold circuit is configured to be turned on when the output voltage of the controlled switch circuit is greater than the first preset voltage
  • the controlled switch circuit is configured to turn off the input end and the output end of the voltage threshold circuit when it is turned on;
  • the output end of the driving chip is set to output a driving signal to the display array of the liquid crystal display panel;
  • the driving chip is configured to drive the display array in the display module.
  • the output voltage of the controlled switch circuit will be greater than the first preset voltage, so that the voltage threshold circuit is turned on, so that the controlled switch circuit turns off the input terminal and the output End to prevent electrical overstress from affecting the driver chip and causing damage to the driver chip.
  • the voltage potential of the controlled terminal of the controlled switching circuit is clamped by the voltage clamping circuit to stabilize the operating characteristics of the controlled switching circuit.
  • the protection circuit further includes a pre-threshold circuit
  • the output end of the controlled switch circuit is set to be grounded through the pre-threshold circuit
  • the pre-threshold circuit is configured to be turned on when the output voltage of the controlled switch circuit is greater than a second preset voltage; the first preset voltage is greater than the second preset voltage.
  • FIG. 1 is a circuit structure diagram of a protection circuit according to one or more embodiments
  • FIG. 2 is a protection circuit diagram according to one or more embodiments
  • FIG. 3 is a circuit structural diagram of another protection circuit according to one or more embodiments.
  • FIG. 5 is a circuit structure diagram of a display driving device according to one or more embodiments.
  • An embodiment of the present invention provides a protection circuit.
  • a protection circuit of an embodiment includes a controlled switch circuit 100, a voltage threshold circuit 101, and a voltage clamping circuit 102;
  • the input terminal of the controlled switch circuit 100 is set to access a logic signal, the output terminal of the controlled switch circuit 100 is set to an input terminal connected to the driver chip, and the controlled terminal of the controlled switch circuit 100 is connected to the controlled switch through a voltage threshold circuit 101 The output of circuit 100;
  • the controlled terminal of the controlled switch circuit 100 is also set to be grounded through the voltage clamping circuit 102;
  • the voltage threshold circuit 101 is configured to be turned on when the voltage at the output of the controlled switch circuit 100 is greater than the first preset voltage
  • the controlled switch circuit 100 is configured to turn off its input terminal and output terminal when the voltage threshold circuit 101 is turned on.
  • the output voltage of the controlled switch circuit 100 is transmitted to its controlled terminal.
  • the input terminal and the output terminal of the controlled switch circuit 100 are in a conducting state, and the voltage of the output terminal of the controlled switch circuit 100 is the same as the voltage of the connected logic signal.
  • the voltage threshold circuit 101 is turned on, so that the voltage of the controlled terminal of the controlled switch circuit 100 is at a high potential, so that its input terminal and output terminal are turned off.
  • the first preset voltage is determined according to the electrical overstress withstand capability of the driving chip. Generally, the first preset voltage is greater than 18V and less than 22V. As a preferred embodiment, the first preset voltage is 20V.
  • the controlled switch circuit 100 includes an electronic switch or a field effect transistor.
  • the controlled terminal voltage of the controlled switch circuit 100 is greater than the first preset voltage.
  • the conduction condition of the electronic switch or the field effect transistor is that the voltage at the controlled terminal is greater than the first preset voltage.
  • the implementation condition of the controlled switch circuit 100 is satisfied, and the controlled switch circuit 100 that conducts according to the threshold adjustment is provided.
  • the voltage clamping circuit 102 is configured to clamp the voltage of the controlled terminal of the controlled switch circuit 100 when the voltage threshold circuit 101 is turned on, so that the voltage of the controlled terminal remains stable.
  • FIG. 2 is a protection circuit diagram according to one or more embodiments.
  • the controlled switching circuit 100 includes a P-channel field effect transistor Q1.
  • the controlled terminal of the controlled switching circuit 100 is the gate of the P-channel field effect transistor Q1, and the input terminal of the controlled switching circuit 100 is the source of the P-channel field effect transistor Q1, the controlled switching circuit The output of 100 is the drain of the P-channel field effect transistor Q1.
  • the voltage threshold circuit 101 when the voltage threshold circuit 101 is turned on, the gate of the P-channel field effect transistor Q1 is at a high potential, and the P-channel field effect transistor Q1 is turned off.
  • the gate of the P-channel field effect transistor Q1 is at a low potential, and the P-channel field effect transistor Q1 is turned on.
  • the voltage threshold circuit 101 includes a first Zener diode D1;
  • the anode of the first zener diode D1 is connected to the controlled end of the controlled switching circuit 100, and the cathode of the first zener diode D1 is connected to the output end of the controlled switching circuit 100.
  • the voltage difference between the cathode and anode of the first Zener diode D1 reaches the breakdown voltage of the first Zener diode D1, so that the first Zener diode D1 reverses conduction, making The controlled terminal of the controlled switching circuit 100, that is, the gate of the P-channel field effect transistor Q1 is at a high potential.
  • the first Zener diode D1 may be a Zener diode with a breakdown voltage greater than 18V and less than 22V.
  • the first voltage stabilizing diode D1 is a voltage stabilizing diode with a breakdown voltage of 20V.
  • the voltage clamping circuit 102 includes a clamping resistor R1.
  • the voltage threshold circuit 101 that is, the first zener diode D1
  • the voltage at the output of the controlled switch circuit 100 and the ground form a potential difference
  • the current flows through the first zener diode D1 and
  • the clamping resistor R1 flows to the ground terminal, and through the clamping resistor R1, a stable voltage difference is formed between the controlled terminal of the controlled switch circuit 100 and the ground terminal, and the controlled terminal of the controlled switch circuit 100 maintains a high potential.
  • it further includes a bias resistor R2;
  • the gate of the P-channel field effect transistor Q1 is connected to the source of the P-channel field effect transistor Q1 through a bias resistor R2.
  • the gate of the P-channel field effect transistor Q1 is connected to its source through a bias resistor R2.
  • the bias resistance R2 is used to provide a bias voltage for the P-channel field effect transistor Q1 to better maintain the operating characteristics of the P-channel field effect transistor Q1.
  • FIG. 3 is a circuit structure diagram of another protection circuit according to one or more embodiments. As shown in FIG. 3, it further includes a pre-threshold circuit 200;
  • the output terminal of the controlled switch circuit 100 is set to be grounded through the pre-threshold circuit 200;
  • the pre-threshold circuit 200 is configured to be turned on when the output voltage of the controlled switch circuit 100 is greater than the second preset voltage; in one embodiment, the first preset voltage is greater than the second preset voltage.
  • the voltage threshold circuit 101 Keep off, the discharge gas overstress can be discharged through the pre-threshold circuit 200 after turning on without turning off the input and output of the controlled switch circuit 100, and the logic signal can be restored to the drive after the electrical overstress disappears The output of the chip to improve the working efficiency of the protection circuit.
  • FIG. 4 is another protection circuit diagram according to one or more embodiments.
  • the pre-threshold circuit 200 includes a second Zener diode D2;
  • the anode of the second zener diode D2 is set to ground, and the cathode of the second zener diode D2 is connected to the output of the controlled switch circuit 100.
  • the second zener diode D2 when the voltage corresponding to the logic signal is greater than the second preset voltage, the second zener diode D2 is reversely broken and turned on, and the logic signal is transmitted to the ground through the second zener diode D2 to discharge The discharge gas is overstressed.
  • the second preset voltage is less than the first preset voltage, that is, the second zener diode D2 may use a zener diode with a breakdown voltage less than the first preset voltage.
  • the second Zener diode D2 is a Zener diode with a breakdown voltage greater than 16V and less than or equal to 18V.
  • the second Zener diode D2 is a Zener diode with a breakdown voltage of 18V.
  • the protection circuit of another embodiment further includes a protection resistor R3;
  • the anode of the second Zener diode D2 is set to be grounded through the protection resistor R3.
  • the protection resistor R3 is used to prevent the risk caused by short circuit in the electrical overstress relief, so as to protect the protective circuit and related components.
  • the embodiment of the invention also provides a driving device.
  • FIG. 5 is a circuit structural diagram of a driving device according to one or more embodiments. As shown in FIG. 5, the driving device includes a driving chip 300 and a protection circuit 301;
  • the protection circuit 301 includes a controlled switch circuit 100, a voltage threshold circuit 101, and a voltage clamping circuit 102;
  • the input terminal of the controlled switch circuit 100 is set to access the logic signal, the output terminal of the controlled switch circuit 100 is set to the input terminal connected to the driving chip 300, and the controlled terminal of the controlled switch circuit 100 is connected to the controlled through the voltage threshold circuit 101 The output of the switch circuit 100;
  • the controlled terminal of the controlled switch circuit 100 is also set to be grounded through the voltage clamping circuit 102;
  • the voltage threshold circuit 101 is configured to be turned on when the voltage at the output of the controlled switch circuit 100 is greater than the first preset voltage
  • the controlled switch circuit 100 is configured to turn off the input terminal and the output terminal when the voltage threshold circuit 101 is turned on;
  • the output end of the driving chip 300 is configured to output a driving signal to the display array of the liquid crystal display panel.
  • An embodiment of the present invention also provides a display device.
  • a display device includes a display module and a driving device
  • the driving device includes a driving chip and a protection circuit
  • the protection circuit includes a controlled switching circuit, a voltage threshold circuit and a voltage clamping circuit
  • the input terminal of the controlled switch circuit is set to access the logic signal, the output terminal of the controlled switch circuit is set to the input terminal connected to the driver chip, and the controlled terminal of the controlled switch circuit is connected to the output terminal of the controlled switch circuit through a voltage threshold circuit ;
  • the controlled end of the controlled switch circuit is also set to ground through the voltage clamping circuit;
  • the voltage threshold circuit is set to be turned on when the output voltage of the controlled switch circuit is greater than the first preset voltage
  • the controlled switch circuit is set to turn off its input end and output end when the voltage threshold circuit is turned on;
  • the output end of the driving chip is set to output a driving signal to the display array of the liquid crystal display panel;
  • the driving chip is configured to drive the display array in the display module.
  • the output voltage of the controlled switch circuit 100 will be greater than the first preset voltage, so that the voltage threshold circuit 101 is turned on, so that the controlled switch circuit 100 Turn off its input and output terminals to prevent electrical overstress from affecting the driver chip and causing damage to the driver chip.
  • the voltage potential of the controlled terminal of the controlled switch circuit 100 is clamped by the voltage clamping circuit 102 to stabilize the operating characteristics of the controlled switch circuit 100.

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Abstract

一种防护电路（301）及显示驱动装置。防护电路（301）包括：在逻辑信号出现电气过应力问题时，受控开关电路（100）的输出端电压会大于第一预设电压，使得电压阈值电路（101）导通，以使受控开关电路（100）关断其输入端与输出端，防止电气过应力影响驱动芯片（300），造成驱动芯片（300）的损坏。同时，通过电压钳位电路（102）钳制受控开关电路（100）的受控端电压电位，以稳定受控开关电路（100）的工作特性。

Description

防护电路及显示驱动装置
本申请要求于2018年11月7日提交中国专利局，申请号为2018113191490，申请名称为“防护电路及显示驱动装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及液晶显示设备技术领域，特别是涉及一种防护电路及显示驱动装置。
背景技术
这里的陈述仅提供与本申请有关的背景信息，而不必然地构成现有技术。液晶显示面板是由一定数量的彩色或黑白像素组成，放置于光源或反射面前方的显示设备。其中，TFT-LCD(Thin Film Transistor Liquid Crystal Display薄膜晶体管液晶显示面板)是当前液晶显示面板的主要品种之一，已经成为了现代IT、视讯产品中重要的显示平台。以TFT-LCD的显示驱动为例，系统主板将R/G/B压缩信号、控制信号及电源通过线材与PCB板上的connector相连接，数据经过PCB板上的TCON(Timing Controller时序控制器)IC处理后，经PCB板，通过S-COF(Source-Chip on Film源级薄膜驱动芯片)和G-COF(Gate-Chip on Film栅极薄膜驱动芯片)与显示区连接，通过显示阵列上的Data line(数据线)和Scan line(扫描线)对电压进行传输，从而使TFT-LCD实现显示功能。即是说，在液晶显示面板中，前端输入的逻辑信号，需要经过相应驱动芯片转换成驱动信号。
但是发明人意识到，因为人员的误操作或相关元件的误接触，容易造成EOS(Electrical Over Stress，电气过应力)问题，即逻辑信号对应的输入电压超过驱动芯片的电压耐压值，造成驱动芯片的损伤。
发明内容
根据本申请公开的各种实施例，提供一种防护电路及显示驱动装置。
一种防护电路，包括受控开关电路、电压阈值电路和电压钳位电路；
所述受控开关电路的输入端设置为接入逻辑信号，所述受控开关电路的输出端设置为连接驱动芯片的输入端，所述受控开关电路的受控端通过所述电压阈值电路连接所述受控 开关电路的输出端；
所述受控开关电路的受控端还设置为通过所述电压钳位电路接地；
所述电压阈值电路设置为在所述受控开关电路的输出端电压大于第一预设电压时导通；
所述受控开关电路设置为在所述电压阈值电路导通时关断其输入端与输出端。
上述的防护电路，在逻辑信号出现电气过应力问题时，受控开关电路的输出端电压会大于第一预设电压，使得电压阈值电路导通，以使受控开关电路关断其输入端与输出端，防止电气过应力影响驱动芯片，造成驱动芯片的损坏。同时，通过电压钳位电路钳制受控开关电路的受控端电压电位，以稳定受控开关电路的工作特性。
在其中一个实施例中，还包括前置阈值电路；
所述受控开关电路的输出端设置为通过所述前置阈值电路接地；
所述前置阈值电路设置为在所述受控开关电路的输出端电压大于第二预设电压时导通；所述第一预设电压大于所述第二预设电压。
在其中一个实施例中，所述受控开关电路包括电子开关或场效应管。
在其中一个实施例中，所述场效应管包括P沟道场效应管。
在其中一个实施例中，所述电压阈值电路包括第一稳压二极管；
所述第一稳压二极管的正极连接所述受控开关电路的受控端，所述第一稳压二极管的负极连接所述受控开关电路的输出端。
在其中一个实施例中，所述前置阈值电路包括第二稳压二极管；
所述第二稳压二极管的正极设置为接地，所述第二稳压二极管的负极连接所述受控开关电路的输出端。
在其中一个实施例中，所述电压钳位电路包括钳位电阻。
在其中一个实施例中，还包括保护电阻；
所述第二稳压二极管的正极通过所述保护电阻接地。
在其中一个实施例中，还包括偏置电阻；
所述P沟道场效应管的栅极通过所述偏置电阻连接所述P沟道场效应管的源极。
一种驱动装置，包括驱动芯片及防护电路；
所述防护电路包括受控开关电路、电压阈值电路和电压钳位电路；
所述受控开关电路的输入端设置为接入逻辑信号，所述受控开关电路的输出端设置为连接所述驱动芯片的输入端，所述受控开关电路的受控端通过所述电压阈值电路连接所述受控开关电路的输出端；
所述受控开关电路的受控端还设置为通过所述电压钳位电路接地；
所述电压阈值电路设置为在所述受控开关电路的输出端电压大于第一预设电压时导通；
所述受控开关电路设置为在所述电压阈值电路导通时关断其输入端与输出端；
所述驱动芯片的输出端设置为向液晶显示面板的显示阵列输出驱动信号。
上述显示驱动装置，在逻辑信号出现电气过应力问题时，受控开关电路的输出端电压会大于第一预设电压，使得电压阈值电路导通，以使受控开关电路关断其输入端与输出端，防止电气过应力影响驱动芯片，造成驱动芯片的损坏。同时，通过电压钳位电路钳制受控开关电路的受控端电压电位，以稳定受控开关电路的工作特性。
在其中一个实施例中，所述防护电路还包括前置阈值电路；
所述受控开关电路的输出端设置为通过所述前置阈值电路接地；
所述前置阈值电路设置为在所述受控开关电路的输出端电压大于第二预设电压时导通；所述第一预设电压大于所述第二预设电压。
在其中一个实施例中，所述受控开关电路包括电子开关或场效应管。
在其中一个实施例中，所述场效应管包括P沟道场效应管。
在其中一个实施例中，所述电压阈值电路包括第一稳压二极管；
所述第一稳压二极管的正极连接所述受控开关电路的受控端，所述第一稳压二极管的负极连接所述受控开关电路的输出端。
在其中一个实施例中，所述前置阈值电路包括第二稳压二极管；
所述第二稳压二极管的正极设置为接地，所述第二稳压二极管的负极连接所述受控开关电路的输出端。
在其中一个实施例中，所述电压钳位电路包括钳位电阻。
在其中一个实施例中，还包括保护电阻；
所述第二稳压二极管的正极通过所述保护电阻接地。
在其中一个实施例中，还包括偏置电阻；
所述P沟道场效应管的栅极通过所述偏置电阻连接所述P沟道场效应管的源极。
一种显示装置，包括显示模组和驱动装置；
所述驱动装置包括驱动芯片及防护电路；
所述防护电路包括受控开关电路、电压阈值电路和电压钳位电路；
所述受控开关电路的输入端设置为接入逻辑信号，所述受控开关电路的输出端设置为连接所述驱动芯片的输入端，所述受控开关电路的受控端通过所述电压阈值电路连接所述受控开关电路的输出端；
所述受控开关电路的受控端还设置为通过所述电压钳位电路接地；
所述电压阈值电路设置为在所述受控开关电路的输出端电压大于第一预设电压时导通；
所述受控开关电路设置为在所述电压阈值电路导通时关断其输入端与输出端；
所述驱动芯片的输出端设置为向液晶显示面板的显示阵列输出驱动信号；
所述驱动芯片设置为驱动所述显示模组中的显示阵列。
上述显示装置，在逻辑信号出现电气过应力问题时，受控开关电路的输出端电压会大于第一预设电压，使得电压阈值电路导通，以使受控开关电路关断其输入端与输出端，防止电气过应力影响驱动芯片，造成驱动芯片的损坏。同时，通过电压钳位电路钳制受控开关电路的受控端电压电位，以稳定受控开关电路的工作特性。
在其中一个实施例中，所述防护电路还包括前置阈值电路；
所述受控开关电路的输出端设置为通过所述前置阈值电路接地；
所述前置阈值电路设置为在所述受控开关电路的输出端电压大于第二预设电压时导通；所述第一预设电压大于所述第二预设电压。
本申请的一个或多个实施例的细节在下面的附图和描述中提出。本申请的其它特征和优点将从说明书、附图以及权利要求书变得明显。
附图说明
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其它的附图。
图1为根据一个或多个实施例中防护电路电路结构图；
图2为根据一个或多个实施例中防护电路图；
图3为根据一个或多个实施例中另一防护电路电路结构图；
图4为根据一个或多个实施例中另一防护电路图；
图5为根据一个或多个实施例中显示驱动装置电路结构图。
具体实施方式
为了使本申请的技术方案及优点更加清楚明白，以下结合附图及实施例，对本申请进行进一步详细说明。应当理解，此处描述的具体实施例仅仅用以解释本申请，并不设置为限定本申请。
本发明实施例提供一种防护电路。
图1为根据一个或多个实施例中防护电路电路结构图，如图1所示，一实施方式的防护电路包括受控开关电路100、电压阈值电路101和电压钳位电路102；
受控开关电路100的输入端设置为接入逻辑信号，受控开关电路100的输出端设置为连接驱动芯片的输入端，受控开关电路100的受控端通过电压阈值电路101连接受控开关电路100的输出端；
受控开关电路100的受控端还设置为通过电压钳位电路102接地；
电压阈值电路101设置为在受控开关电路100的输出端电压大于第一预设电压时导通；
受控开关电路100设置为在电压阈值电路101导通时关断其输入端与输出端。
在其中一个实施例中，在电压阈值电路101导通后，受控开关电路100的输出端电压传输至其受控端。一般的，受控开关电路100的输入端与输出端处于导通状态，受控开关电路100的输出端电压与接入的逻辑信号电压相同。在接入的逻辑信号出现电气过应力时，电压阈值电路101导通，使得受控开关电路100的受控端电压处于高电位，使得其输 入端与输出端关断。在其中一个实施例中，第一预设电压根据驱动芯片的电气过应力承受能力进行确定。一般的，第一预设电压大于18V小于22V。作为一个较优的实施方式，第一预设电压为20V。
在其中一个实施例中，受控开关电路100包括电子开关或场效应管。
在其中一个实施例中，在出现电气过应力电压阈值电路101导通时，受控开关电路100的受控端电压大于第一预设电压。对应的，电子开关或场效应管的导通条件为受控端电压大于第一预设电压。
通过电子开关或场效应管，满足受控开关电路100的实施条件，提供根据阈值调节进行导通的受控开关电路100。
在其中一个实施例中，电压钳位电路102设置为在电压阈值电路101导通时，钳制受控开关电路100的受控端电压，使受控端电压保持稳定。
在其中一个实施例中，图2为根据一个或多个实施例中防护电路图，如图2所示，受控开关电路100包括P沟道场效应管Q1。
在其中一个实施例中，受控开关电路100的受控端为P沟道场效应管Q1的栅极，受控开关电路100的输入端为P沟道场效应管Q1的源极，受控开关电路100的输出端为P沟道场效应管Q1的漏极。在其中一个实施例中，在电压阈值电路101导通时，P沟道场效应管Q1的栅极处于高电位，P沟道场效应管Q1关断。在电压阈值电路101关断时，P沟道场效应管Q1的栅极处于低电位，P沟道场效应管Q1导通。
在其中一个实施例中，如图2所示，电压阈值电路101包括第一稳压二极管D1；
第一稳压二极管D1的正极连接受控开关电路100的受控端，第一稳压二极管D1的负极连接受控开关电路100的输出端。
在其中一个实施例中，在出现电气过应力时，第一稳压二极管D1的负极与正极电压差达到第一稳压二极管D1的击穿电压，使得第一稳压二极管D1反向导通，使得受控开关电路100的受控端，即P沟道场效应管Q1的栅极处于高电位。在其中一个实施例中，第一稳压二极管D1可选用击穿电压大于18V小于22V的稳压二极管。作为一个较优的实施方式，第一稳压二极管D1选用击穿电压为20V的稳压二极管。
在其中一个实施例中，如图2所示，电压钳位电路102包括钳位电阻R1。
在其中一个实施例中，在电压阈值电路101，即第一稳压二极管D1导通时，受控开关电路100的输出端电压与接地端形成电位差，电流依次经第一稳压二极管D1和钳位电阻R1流向接地端，通过钳位电阻R1，在受控开关电路100的受控端与接地端间形成稳定的电压差，保持受控开关电路100的受控端的高电位。
在其中一个实施例中，如图2所示，还包括偏置电阻R2；
P沟道场效应管Q1的栅极通过偏置电阻R2连接P沟道场效应管Q1的源极。
在其中一个实施例中，P沟道场效应管Q1的栅极通过一偏置电阻R2连接其源极。在其中一个实施例中，通过偏置电阻R2，为P沟道场效应管Q1提供偏置电压，更好地保持P沟道场效应管Q1的工作特性。
在其中一个实施例中，图3为根据一个或多个实施例中另一防护电路电路结构图，如图3所示，还包括前置阈值电路200；
受控开关电路100的输出端设置为通过前置阈值电路200接地；
前置阈值电路200设置为在受控开关电路100的输出端电压大于第二预设电压时导通；在其中一个实施例中，第一预设电压大于第二预设电压。
在其中一个实施例中，通过前置阈值电路200，在出现电气过应力时，且在该电气过应力对应的应力电压大于第二预设电压且小于第一预设电压时，电压阈值电路101保持关断，无需关断受控开关电路100的输入端与输出端即可通过导通后的前置阈值电路200泄放电气过应力，在电气过应力消失后，即可恢复逻辑信号向驱动芯片的输出，以提高防护电路的工作效率。
在其中一个实施例中，图4为根据一个或多个实施例中另一防护电路图，如图4所示，前置阈值电路200包括第二稳压二极管D2；
第二稳压二极管D2的正极设置为接地，第二稳压二极管D2的负极连接受控开关电路100的输出端。
在其中一个实施例中，在逻辑信号对应的电压大于第二预设电压时，第二稳压二极管D2反向击穿导通，逻辑信号通过第二稳压二极管D2传输至接地端，以泄放电气过应力。在其中一个实施例中，第二预设电压小于第一预设电压，即第二稳压二极管D2可选用击穿电压小于第一预设电压的稳压二极管。在其中一个实施例中，第二稳压二极管D2选用 击穿电压大于16V小于等于18V的稳压二极管。作为一个较优的实施方式，第二稳压二极管D2选用击穿电压为18V的稳压二极管。
在其中一个实施例中，如图4所示，另一实施方式的防护电路还包括保护电阻R3；
第二稳压二极管D2的正极设置为通过保护电阻R3接地。
在其中一个实施例中，通过保护电阻R3，防止电气过应力泄放中因短路造成的风险，以保护防护电路及相关元件。
本发明实施例还提供一种驱动装置。
图5为根据一个或多个实施例中驱动装置电路结构图，如图5所示，驱动装置包括驱动芯片300及防护电路301；
防护电路301包括受控开关电路100、电压阈值电路101和电压钳位电路102；
受控开关电路100的输入端设置为接入逻辑信号，受控开关电路100的输出端设置为连接驱动芯片300的输入端，受控开关电路100的受控端通过电压阈值电路101连接受控开关电路100的输出端；
受控开关电路100的受控端还设置为通过电压钳位电路102接地；
电压阈值电路101设置为在受控开关电路100的输出端电压大于第一预设电压时导通；
受控开关电路100设置为在电压阈值电路101导通时关断其输入端与输出端；
驱动芯片300的输出端设置为向液晶显示面板的显示阵列输出驱动信号。
本发明实施例还提供一种显示装置。
一种显示装置，包括显示模组和驱动装置；
驱动装置包括驱动芯片及防护电路；
防护电路包括受控开关电路、电压阈值电路和电压钳位电路；
受控开关电路的输入端设置为接入逻辑信号，受控开关电路的输出端设置为连接驱动芯片的输入端，受控开关电路的受控端通过电压阈值电路连接受控开关电路的输出端；
受控开关电路的受控端还设置为通过电压钳位电路接地；
电压阈值电路设置为在受控开关电路的输出端电压大于第一预设电压时导通；
受控开关电路设置为在电压阈值电路导通时关断其输入端与输出端；
驱动芯片的输出端设置为向液晶显示面板的显示阵列输出驱动信号；
驱动芯片设置为驱动显示模组中的显示阵列。
上述的防护电路及驱动装置，在逻辑信号出现电气过应力问题时，受控开关电路100的输出端电压会大于第一预设电压，使得电压阈值电路101导通，以使受控开关电路100关断其输入端与输出端，防止电气过应力影响驱动芯片，造成驱动芯片的损坏。同时，通过电压钳位电路102钳制受控开关电路100的受控端电压电位，以稳定受控开关电路100的工作特性。
以上所述实施例的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施例中的各个技术特征所有可能的组合都进行描述，然而，只要这些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。
以上所述实施例仅表达了本申请的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对本申请专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本申请构思的前提下，还可以做出若干变形和改进，这些都属于本申请的保护范围。因此，本申请专利的保护范围应以所附权利要求为准。

Claims (20)

  1. 一种防护电路，包括受控开关电路、电压阈值电路和电压钳位电路；
    所述受控开关电路的输入端设置为接入逻辑信号，所述受控开关电路的输出端设置为连接驱动芯片的输入端，所述受控开关电路的受控端通过所述电压阈值电路连接所述受控开关电路的输出端；
    所述受控开关电路的受控端还设置为通过所述电压钳位电路接地；
    所述电压阈值电路设置为在所述受控开关电路的输出端电压大于第一预设电压时导通；
    所述受控开关电路设置为在所述电压阈值电路导通时关断其输入端与输出端。
  2. 根据权利要求1所述的防护电路，其中，还包括前置阈值电路；
    所述受控开关电路的输出端设置为通过所述前置阈值电路接地；
    所述前置阈值电路设置为在所述受控开关电路的输出端电压大于第二预设电压时导通；所述第一预设电压大于所述第二预设电压。
  3. 根据权利要求1所述的防护电路，其中，所述受控开关电路包括电子开关或场效应管。
  4. 根据权利要求3所述的防护电路，其中，所述场效应管包括P沟道场效应管。
  5. 根据权利要求1所述的防护电路，其中，所述电压阈值电路包括第一稳压二极管；
    所述第一稳压二极管的正极连接所述受控开关电路的受控端，所述第一稳压二极管的负极连接所述受控开关电路的输出端。
  6. 根据权利要求2所述的防护电路，其中，所述前置阈值电路包括第二稳压二极管；
    所述第二稳压二极管的正极设置为接地，所述第二稳压二极管的负极连接所述受控开关电路的输出端。
  7. 根据权利要求1所述的防护电路，其中，所述电压钳位电路包括钳位电阻。
  8. 根据权利要求6所述的防护电路，其中，还包括保护电阻；
    所述第二稳压二极管的正极通过所述保护电阻接地。
  9. 根据权利要求4所述的防护电路，其中，还包括偏置电阻；
    所述P沟道场效应管的栅极通过所述偏置电阻连接所述P沟道场效应管的源极。
  10. 一种驱动装置，包括驱动芯片及防护电路；
    所述防护电路包括受控开关电路、电压阈值电路和电压钳位电路；
    所述受控开关电路的输入端设置为接入逻辑信号，所述受控开关电路的输出端设置为连接所述驱动芯片的输入端，所述受控开关电路的受控端通过所述电压阈值电路连接所述受控开关电路的输出端；
    所述受控开关电路的受控端还设置为通过所述电压钳位电路接地；
    所述电压阈值电路设置为在所述受控开关电路的输出端电压大于第一预设电压时导通；
    所述受控开关电路设置为在所述电压阈值电路导通时关断其输入端与输出端；
    所述驱动芯片的输出端设置为向液晶显示面板的显示阵列输出驱动信号。
  11. 根据权利要求10所述的驱动装置，其中，所述防护电路还包括前置阈值电路；
    所述受控开关电路的输出端设置为通过所述前置阈值电路接地；
    所述前置阈值电路设置为在所述受控开关电路的输出端电压大于第二预设电压时导通；所述第一预设电压大于所述第二预设电压。
  12. 根据权利要求10所述的驱动装置，其中，所述受控开关电路包括电子开关或场效应管。
  13. 根据权利要求12所述的驱动装置，其中，所述场效应管包括P沟道场效应管。
  14. 根据权利要求10所述的驱动装置，其中，所述电压阈值电路包括第一稳压二极管；
    所述第一稳压二极管的正极连接所述受控开关电路的受控端，所述第一稳压二极管的负极连接所述受控开关电路的输出端。
  15. 根据权利要求11所述的驱动装置，其中，所述前置阈值电路包括第二稳压二极管；
    所述第二稳压二极管的正极设置为接地，所述第二稳压二极管的负极连接所述受控开关电路的输出端。
  16. 根据权利要求10所述的驱动装置，其中，所述电压钳位电路包括钳位电阻。
  17. 根据权利要求15所述的驱动装置，其中，还包括保护电阻；
    所述第二稳压二极管的正极通过所述保护电阻接地。
  18. 根据权利要求13所述的驱动装置，其中，还包括偏置电阻；
    所述P沟道场效应管的栅极通过所述偏置电阻连接所述P沟道场效应管的源极。
  19. 一种显示装置，包括显示模组和驱动装置；
    所述驱动装置包括驱动芯片及防护电路；
    所述防护电路包括受控开关电路、电压阈值电路和电压钳位电路；
    所述受控开关电路的输入端设置为接入逻辑信号，所述受控开关电路的输出端设置为连接所述驱动芯片的输入端，所述受控开关电路的受控端通过所述电压阈值电路连接所述受控开关电路的输出端；
    所述受控开关电路的受控端还设置为通过所述电压钳位电路接地；
    所述电压阈值电路设置为在所述受控开关电路的输出端电压大于第一预设电压时导通；
    所述受控开关电路设置为在所述电压阈值电路导通时关断其输入端与输出端；
    所述驱动芯片的输出端设置为向液晶显示面板的显示阵列输出驱动信号；
    所述驱动芯片设置为驱动所述显示模组中的显示阵列。
  20. 根据权利要求19所述的显示装置，其中，所述防护电路还包括前置阈值电路；
    所述受控开关电路的输出端设置为通过所述前置阈值电路接地；
    所述前置阈值电路设置为在所述受控开关电路的输出端电压大于第二预设电压时导通；所述第一预设电压大于所述第二预设电压。
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Publication number Priority date Publication date Assignee Title
CN109166557B (zh) 2018-11-07 2020-12-22 惠科股份有限公司 防护电路及显示驱动装置
CN109546998A (zh) * 2019-01-22 2019-03-29 上海艾为电子技术股份有限公司 一种电压选择电路
CN109801604A (zh) * 2019-03-21 2019-05-24 惠科股份有限公司 供电控制电路、供电电路及显示装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3931546A (en) * 1974-05-28 1976-01-06 C. E. Niehoff & Co. Over-voltage protection circuit
JP2006067187A (ja) * 2004-08-26 2006-03-09 Matsushita Electric Ind Co Ltd 過電圧過電流保護回路
CN104218529A (zh) * 2013-05-29 2014-12-17 鸿富锦精密工业（深圳）有限公司 电源转换电路及电子装置
CN107705742A (zh) * 2017-09-28 2018-02-16 惠科股份有限公司 一种显示面板的驱动电路及显示装置
CN207664618U (zh) * 2017-12-20 2018-07-27 成都立元智能交通技术有限公司 一种视频图像信息统一接入系统
CN109166557A (zh) * 2018-11-07 2019-01-08 惠科股份有限公司 防护电路及显示驱动装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4305875B2 (ja) * 2006-05-22 2009-07-29 富士通テン株式会社 電源制御回路及び電源制御回路を備えた電子制御装置
US8861164B2 (en) * 2011-02-04 2014-10-14 Fairchild Semiconductor Corporation Integrated overdrive and overvoltage protection device
US9632374B2 (en) * 2011-07-01 2017-04-25 Rohm Co., Ltd. Overvoltage protection circuit, power supply device, liquid crystal display device, electronic device and television set
DE102014116734A1 (de) * 2014-11-17 2016-05-19 Eaton Electrical Ip Gmbh & Co. Kg Schaltung zum Schutz vor Überspannungen
JP6531941B2 (ja) * 2015-07-08 2019-06-19 パナソニックＩｐマネジメント株式会社 回路装置、点灯装置、及びそれを用いた車両
US20200014294A1 (en) * 2018-07-06 2020-01-09 Qualcomm Incorporated Surge protection circuit for switched-mode power supplies

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3931546A (en) * 1974-05-28 1976-01-06 C. E. Niehoff & Co. Over-voltage protection circuit
JP2006067187A (ja) * 2004-08-26 2006-03-09 Matsushita Electric Ind Co Ltd 過電圧過電流保護回路
CN104218529A (zh) * 2013-05-29 2014-12-17 鸿富锦精密工业（深圳）有限公司 电源转换电路及电子装置
CN107705742A (zh) * 2017-09-28 2018-02-16 惠科股份有限公司 一种显示面板的驱动电路及显示装置
CN207664618U (zh) * 2017-12-20 2018-07-27 成都立元智能交通技术有限公司 一种视频图像信息统一接入系统
CN109166557A (zh) * 2018-11-07 2019-01-08 惠科股份有限公司 防护电路及显示驱动装置

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