WO2014172985A1 - 一种启动控制电路以及显示面板驱动电路及显示装置 - Google Patents

一种启动控制电路以及显示面板驱动电路及显示装置 Download PDF

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WO2014172985A1
WO2014172985A1 PCT/CN2013/077873 CN2013077873W WO2014172985A1 WO 2014172985 A1 WO2014172985 A1 WO 2014172985A1 CN 2013077873 W CN2013077873 W CN 2013077873W WO 2014172985 A1 WO2014172985 A1 WO 2014172985A1
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Prior art keywords
startup
dimensional
capacitor
fet
mode
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PCT/CN2013/077873
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English (en)
French (fr)
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曹丹
秦杰辉
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深圳市华星光电技术有限公司
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Priority to US14/001,874 priority Critical patent/US9245476B2/en
Publication of WO2014172985A1 publication Critical patent/WO2014172985A1/zh

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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
    • 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
    • G09G3/3406—Control of illumination source
    • 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
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/026—Arrangements or methods related to booting a display

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  • the present invention relates to the field of LED televisions, and in particular, to a start control circuit and a display panel drive circuit and display device having the same.
  • the soft start time of the existing LED TVs in the different startup modes is the same.
  • the startup mode is the three-dimensional startup mode
  • the maximum current flowing through the LED is much larger than the two-dimensional startup mode. If the soft-start time of the startup mode is the same in different startup modes, the startup mode is the three-dimensional startup mode.
  • the current flowing through the inductor at the moment of startup is too large to exceed the saturation current of the inductor or exceed the rated current specification of the FET.
  • the object of the present invention is to solve the problem that the current flowing through the inductor at the startup instant exceeds the saturation current of the inductor or exceeds the rated current specification of the FET, thereby providing an effective protection circuit and preventing the current from being turned on.
  • a start control circuit comprising a first switch unit, a start control unit, a second switch unit, and an output end of the first switch unit is connected to the start control unit. At the input end, the output of the start control unit is connected to the input of the second switch unit.
  • the first switching unit is configured to determine a charging path of the startup control unit according to an input signal of different startup modes; the startup control unit is configured to execute a corresponding startup mode, and the startup of the corresponding startup mode is stored at a charging time corresponding to the charging path The energy, thereby controlling the current of the second switching unit when the power is turned on, the charging time is the soft start time; the second switching unit controls the external circuit by receiving the gate signal output by the starting control unit.
  • the startup mode includes a two-dimensional startup mode and a three-dimensional startup mode
  • the charging path includes a first charging path and a second charging path.
  • the first switching unit includes a second FET whose source is grounded, and the gate of the second FET receives the input signal of the two-dimensional startup mode or the three-dimensional startup mode, according to The detected input signal of the two-dimensional start mode or the three-dimensional start mode controls the second FET to be turned off or on.
  • the startup control unit includes an integrated chip, a first capacitor and a second capacitor, and one end of the first capacitor and the second capacitor are commonly connected to the soft start port of the integrated chip, and the first capacitor The other end is connected to the source of the second FET, and the other end of the second capacitor is connected to the drain of the second FET;
  • the input signal is low, the second FET is turned off, and the charging of the second capacitor is turned off.
  • the first charging path is a charging path for the first capacitor, and is in The startup energy of the two-dimensional startup mode is stored in the soft start time corresponding to the first capacitor;
  • the input signal is high, and the second FET is turned on.
  • the second charging path is a charging path for the first capacitor and the second capacitor, and is in the first capacitor and the second capacitor.
  • the corresponding soft start time stores the start energy of the three-dimensional start mode.
  • the starting energy of the three-dimensional starting mode is greater than the starting energy of the two-dimensional starting mode.
  • the second switching unit includes an inductor, a first FET, one end of the inductor is connected to the drain of the first FET, and further includes a first a resistor, the first resistor is connected to the gate port of the integrated chip and the first FET gate, a third resistor, the third resistor is connected to the current detecting port of the integrated chip and the a first FET source, a second resistor, one end of the second resistor is connected to the first FET source, and the other end is grounded.
  • the invention also provides a display panel driving circuit, comprising a panel driving circuit and a light source driving circuit, wherein the light source driving circuit comprises a starting control circuit;
  • the start control circuit includes a first switch unit, a start control unit, and a second switch unit, an output end of the first switch unit is connected to an input end of the start control unit, and an output of the start control unit An end is connected to an input end of the second switching unit,
  • the first switching unit is configured to determine a charging path of the startup control unit according to input signals of different startup modes
  • the startup control unit is configured to execute a corresponding startup mode, and store a startup energy of the corresponding startup mode at a charging time corresponding to the charging path, thereby controlling a current of a startup moment of the second switching unit,
  • the charging time is the soft start time
  • the second switching unit controls the external circuit by receiving a gating signal output by the startup control unit.
  • the startup mode includes a two-dimensional startup mode and a three-dimensional startup mode
  • the charging path includes a first charging path and a second charging path.
  • the first switching unit includes a second FET whose source is grounded, and the gate of the second FET receives the two-dimensional startup mode or three-dimensional startup.
  • the input signal of the mode controls the second FET to be turned off or on according to the detected input signal of the two-dimensional starting mode or the three-dimensional starting mode.
  • the startup control unit includes an integrated chip, a first capacitor and a second capacitor, and one ends of the first capacitor and the second capacitor are commonly connected to the integrated chip. a soft start port, the other end of the first capacitor is connected to a source of the second field effect transistor, and the other end of the second capacitor is connected to a drain of the second field effect transistor;
  • the input signal is at a low level, and the second FET is turned off.
  • the first charging path is a charging path to the first capacitor, and
  • the startup energy of the two-dimensional startup mode is stored in the soft start time corresponding to the first capacitor;
  • the input signal is at a high level, and the second FET is turned on, and the second charging path is charging the first capacitor and the second capacitor, and
  • the startup energy of the three-dimensional startup mode is stored at the soft start time corresponding to the first capacitance and the second capacitance.
  • the starting energy of the three-dimensional starting mode is greater than the starting energy of the two-dimensional starting mode.
  • the second switching unit includes an inductor, a first FET, and one end of the inductor is connected to the drain of the first FET, and further includes a a first resistor, the first resistor is connected to the gate port of the integrated chip and the first FET gate, and a third resistor is connected to the current detecting port of the integrated chip and The first FET source, a second resistor, one end of the second resistor is connected to the first FET source, and the other end is grounded.
  • the invention also provides a display device comprising a panel driving circuit and a light source driving circuit, the light source driving circuit comprising a starting control circuit;
  • the start control circuit includes a first switch unit, a start control unit, and a second switch unit, an output end of the first switch unit is connected to an input end of the start control unit, and an output of the start control unit An end is connected to an input end of the second switching unit,
  • the first switching unit is configured to determine a charging path of the startup control unit according to input signals of different startup modes
  • the startup control unit is configured to execute a corresponding startup mode, and store a startup energy of the corresponding startup mode at a charging time corresponding to the charging path, thereby controlling a current of a startup moment of the second switching unit,
  • the charging time is the soft start time
  • the second switching unit controls the external circuit by receiving a gating signal output by the startup control unit.
  • the startup mode includes a two-dimensional startup mode and a three-dimensional startup mode
  • the charging path includes a first charging path and a second charging path.
  • the first switching unit includes a second FET whose source is grounded, and the gate of the second FET receives the two-dimensional startup mode or three-dimensional startup.
  • the input signal of the mode controls the second FET to be turned off or on according to the detected input signal of the two-dimensional starting mode or the three-dimensional starting mode.
  • the startup control unit includes an integrated chip, a first capacitor and a second capacitor, and one ends of the first capacitor and the second capacitor are commonly connected to the integrated chip. a soft start port, the other end of the first capacitor is connected to a source of the second field effect transistor, and the other end of the second capacitor is connected to a drain of the second field effect transistor;
  • the input signal is at a low level, and the second FET is turned off.
  • the first charging path is a charging path to the first capacitor, and
  • the startup energy of the two-dimensional startup mode is stored in the soft start time corresponding to the first capacitor;
  • the input signal is at a high level, and the second FET is turned on, and the second charging path is charging the first capacitor and the second capacitor, and
  • the startup energy of the three-dimensional startup mode is stored at the soft start time corresponding to the first capacitance and the second capacitance.
  • the starting energy of the three-dimensional starting mode is greater than the starting energy of the two-dimensional starting mode.
  • the second switching unit includes an inductor, a first FET, and one end of the inductor is connected to the drain of the first FET, and further includes a a first resistor, the first resistor is connected to the gate port of the integrated chip and the first FET gate, and a third resistor is connected to the current detecting port of the integrated chip and The first FET source, a second resistor, one end of the second resistor is connected to the first FET source, and the other end is grounded.
  • the invention has the beneficial effects of protecting the inductor and the field effect transistor at the startup instant in different startup modes.
  • the charging path of the startup control unit can be determined according to the input signals of different startup modes, and the corresponding startup mode is executed, and the startup energy of the corresponding startup mode is stored in the charging time corresponding to the charging path, thereby preventing the current at the startup instant from being excessive, especially
  • the startup mode is the three-dimensional startup mode
  • the output is set up for a longer period of time, so that more energy can be gradually accumulated, thereby preventing the three-dimensional startup in the startup mode.
  • the mode is turned on, the current flowing through the inductor and the FET is too large.
  • the circuit of the invention has simple structure and low cost.
  • Figure 1 is a circuit block diagram of a start control circuit
  • FIG. 2 is a schematic diagram showing the circuit structure of a preferred embodiment of the startup control circuit.
  • the first soft-start time is adopted, and the first circuit is adopted.
  • a second capacitor is connected in parallel with the capacitor, and the high-low level principle of the circuit is used to determine different charging paths.
  • the charging time corresponding to the charging path (that is, the soft-start time) stores the starting energy of the corresponding starting mode, thereby controlling the starting moment. Because the present invention adopts a charging path, by changing the value of the corresponding charging capacitor C, different soft start times are implemented in different startup modes, thereby eliminating the problem of excessive current at the startup instant and realizing the protection circuit. purpose.
  • FIG. 1 it is a circuit block diagram of a start control circuit, which includes a first switch unit 100 , a start control unit 200 , a second switch unit 300 , and an output end of the first switch unit 100 is connected to the start control unit 200 .
  • the output of the startup control unit 200 is connected to the input of the second switching unit 300.
  • the first switch unit 100 is configured to determine a charging path of the startup control unit 200 according to input signals of different startup modes; the startup control unit 200 is configured to execute a corresponding startup mode, and store at a charging time corresponding to the charging path.
  • the startup energy of the corresponding startup mode is controlled to control the current of the second switching unit 300 at the startup instant, and the charging time is a soft start time; the second switching unit 300 receives the output by the startup control unit 200
  • the gate signal controls the external circuit.
  • the second FET Q2 detects input signals of different startup modes through the gate, and the drain and the second of the second FET Q2.
  • the capacitor C2 is connected, the source is connected to the common ground signal terminal 2 of the integrated chip U1, and the other end of the second capacitor C2 is connected to the soft start port 1 of the integrated chip U1.
  • the two ends of the first capacitor C1 are directly connected to the soft start port 1 and the common ground port 2 of the integrated chip U1, and the gate port 4 of the integrated chip U1 is connected to the gate of the first field effect transistor Q1 through the first resistor R1, and integrated.
  • the current detecting port 3 of the chip U1 is connected to the source of the first field effect transistor Q1 through the third resistor R3, and the source of the first field effect transistor Q1 is connected to the common ground signal through the second resistor R2, the first field effect transistor
  • the drain of Q1 is connected to the power supply Vin through an inductor L1, and the integrated chip U1 is a common control chip, and the model number is uncertain. This is a well-known technology in the field, and will not be described here.
  • the startup control circuit of the present invention comprises a two-dimensional startup mode and a three-dimensional startup mode, that is, 2D and 3D modes of the LED, and the activation energy of the three-dimensional startup mode is greater than the startup energy of the two-dimensional startup mode.
  • the charging path includes a first charging path and a second charging path.
  • the first charging path charges the first capacitor C1
  • the second charging path charges the first capacitor C1 and the second capacitor C2 simultaneously.
  • Iss is generated at the soft start port 1 to charge the capacitor connected to the soft start port 1, when the voltage of the soft start port 1 exceeds the inside of the integrated chip U1.
  • Vss a fixed voltage
  • the input signal is low, and when the gate of the second FET Q2 detects that the input signal is low, the second FET Q2 is turned off, and the charging of the second capacitor C2 is turned off.
  • the cutoff of the second FET in the first switching unit 100 determines that the capacitive charging path in the startup control unit 200 is the first charging path, and the soft start time is the When the first capacitor C1 is charged, that is, in the two-dimensional startup mode, the soft start time is (C1*Vss)/Iss;
  • the input signal is at a high level, and the second FET Q2 is turned on, determining that the capacitor charging path in the startup control unit 200 is the second charging path.
  • the second charging path is the charging of the first capacitor C1 and the second capacitor C2.
  • the charging capacitor is equivalent to the parallel connection of the first capacitor and the second capacitor, that is, the capacitor value is equivalent to the sum of the two capacitor values (C1+C2).
  • the soft start time is (C1+C2)*Vss/Iss.
  • the soft start time is longer in the three-dimensional startup mode.
  • the startup charging capacitance is the same as C1, so the soft start time is also the same (C1*Vss)/Iss.
  • the maximum current flowing through the LED is much larger than the two-dimensional startup mode, and the output voltage Vo in the three-dimensional startup mode is also larger than in the two-dimensional startup mode, resulting in the startup when the startup mode is the three-dimensional startup mode.
  • the energy that needs to be supplied instantaneously is larger, and the current flowing through the inductor L1 and the first field effect transistor Q1 in the second switching unit 300 is excessively large.
  • the present invention improves the soft start path and implements different startup modes to perform differently.
  • the soft start path compared with the prior art, extends the soft start time, and the output is set up for a longer period of time, so that the effect of gradually accumulating more energy can be achieved, thereby preventing the start-up flow through the inductor and the FET. Overcurrent.
  • the integrated chip U1 in the startup control unit 200 can output a gating signal from the gating port 4 to the first field effect in the second switching unit 300 after the soft start is completed.
  • the gate of the tube Q1 implements a switch that controls the subsequent connection circuit.
  • the current detecting port 3 of the integrated chip U1 controls the power of the switching power supply in the subsequent connecting circuit.
  • the second switch unit 300 is externally connected with an LED light string display unit.
  • the gate port 4 of the integrated chip U1 controls the switch of the LED light string display unit, and the current detecting port 3 of the integrated chip U1. Controlling the power of the switching power supply of the LED string display unit is well known in the art and will not be described herein.
  • the present invention also discloses a display panel driving circuit and a display device.
  • the display panel driving circuit and the display device each include a panel driving circuit and a light source driving circuit, wherein the light source driving circuit includes the startup control circuit of the above embodiment.
  • the face drive circuit and the light source drive circuit are well known in the art and will not be described herein.

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Abstract

一种启动控制电路，包括一第一开关单元，一启动控制单元，一第二开关单元，第一开关单元用于根据不同的启动模式的输入信号确定所述启动控制单元的充电路径；启动控制单元用于执行相应的启动模式，在与所述充电路径对应的充电时间存储所述相应的启动模式的启动能量，从而控制第二开关单元的开机瞬间的电流；第二开关单元通过接收所述启动控制单元所输出的门控信号控制外接电路。本发明还提供一种采用上述启动控制电路的显示面板驱动电路及显示装置。本发明解决了现有技术在开机瞬间电流过大的问题，而且电路结构简单，成本低。

Description

一种启动控制电路以及显示面板驱动电路及显示装置 技术领域
本发明涉及LED电视领域，尤其涉及一种启动控制电路以及具有该启动控制电路的显示面板驱动电路及显示装置。
背景技术
现有的LED电视在不同启动模式下开机瞬间的软启动时间是相同的。而在启动模式为三维启动模式时，流过LED的最大电流比二维启动模式大很多，如果不同启动模式下开机瞬间的软启动时间是相同的，就会导致在启动模式为三维启动模式时开机瞬间流过电感的电流过大而超过电感的饱和电流或者超过场效应管的额定电流规格。
发明内容
本发明的目的在于解决现有技术在开机瞬间流过电感的电流过大而超过电感的饱和电流或者超过场效应管的额定电流规格的问题，提供一种能有效保护电路、防止开机瞬间电流过大的启动控制电路以及显示面板驱动电路及显示装置。
为了达到上述目的，本发明采用的技术方案是：一种启动控制电路，包括一第一开关单元，一启动控制单元，一第二开关单元，第一开关单元的输出端连接至启动控制单元的输入端，启动控制单元的输出端连接至第二开关单元的输入端。第一开关单元用于根据不同的启动模式的输入信号确定启动控制单元的充电路径；启动控制单元用于执行相应的启动模式，在与充电路径对应的充电时间存储所述相应的启动模式的启动能量，从而控制第二开关单元的开机瞬间的电流，充电时间为软启动时间；第二开关单元通过接收启动控制单元所输出的门控信号控制外接电路。
在本发明一种启动控制电路中，启动模式包括二维启动模式和三维启动模式，充电路径包括第一充电路径和第二充电路径。
在本发明一种启动控制电路中，第一开关单元包括一源极接地的第二场效应管，第二场效应管的栅极接收所述二维启动模式或三维启动模式的输入信号，根据检测到的二维启动模式或三维启动模式的输入信号控制第二场效应管截止或导通。
在本发明一种启动控制电路中，启动控制单元包括一集成芯片，一第一电容和一第二电容，第一电容和第二电容的一端共同连接到集成芯片的软启动端口，第一电容的另一端连接至第二场效应管的源极，第二电容的另一端连接至第二场效应管的漏极；
在二维启动模式下，输入信号为低电平，第二场效应管截止，断开对第二电容的充电，此时所述第一充电路径为对第一电容的充电路径，并在与所述第一电容对应的所述软启动时间里存储所述二维启动模式的启动能量；
在三维启动模式下，输入信号为高电平，第二场效应管导通，此时第二充电路径为对第一电容和第二电容的充电路径，并在与第一电容和第二电容对应的软启动时间存储三维启动模式的启动能量。
在本发明一种启动控制电路中，三维启动模式的启动能量大于二维启动模式的启动能量。
在本发明一种启动控制电路中，所述第二开关单元包括一电感，一第一场效应管，所述电感的一端连接至所述第一场效应管的漏极，还包括一第一电阻，所述第一电阻连接所述集成芯片的门控端口和所述第一场效应管栅极，一第三电阻，所述第三电阻连接所述集成芯片的电流侦测端口和所述第一场效应管源极，一第二电阻，所述第二电阻的一端连接至所述第一场效应管源极，另一端接地。
本发明还提供一种显示面板驱动电路，包括面板驱动电路和光源驱动电路，所述光源驱动电路包括启动控制电路；
所述启动控制电路包括一第一开关单元，一启动控制单元，一第二开关单元，所述第一开关单元的输出端连接至所述启动控制单元的输入端，所述启动控制单元的输出端连接至所述第二开关单元的输入端，
所述第一开关单元用于根据不同的启动模式的输入信号确定所述启动控制单元的充电路径；
所述启动控制单元用于执行相应的启动模式，在与所述充电路径对应的充电时间存储所述相应的启动模式的启动能量，从而控制所述第二开关单元的开机瞬间的电流，所述充电时间为软启动时间；
所述第二开关单元通过接收所述启动控制单元所输出的门控信号控制外接电路。
在本发明所述的显示面板驱动电路中，所述启动模式包括二维启动模式和三维启动模式，所述充电路径包括第一充电路径和第二充电路径。
在本发明所述的显示面板驱动电路中，所述第一开关单元包括一源极接地的第二场效应管，所述第二场效应管的栅极接收所述二维启动模式或三维启动模式的输入信号，根据检测到的所述二维启动模式或三维启动模式的输入信号控制所述第二场效应管截止或导通。
在本发明所述的显示面板驱动电路中，所述启动控制单元包括一集成芯片，一第一电容和一第二电容，所述第一电容和第二电容的一端共同连接到所述集成芯片的软启动端口，所述第一电容的另一端连接至所述第二场效应管的源极，所述第二电容的另一端连接至所述第二场效应管的漏极；
在所述二维启动模式下，所述输入信号为低电平，所述第二场效应管截止，此时所述第一充电路径为对所述第一电容的充电路径，并在与所述第一电容对应的所述软启动时间里存储所述二维启动模式的启动能量；
在所述三维启动模式下，所述输入信号为高电平，所述第二场效应管导通，此时所述第二充电路径为对所述第一电容和第二电容的充电，并在与所述第一电容和第二电容对应的所述软启动时间存储所述三维启动模式的启动能量。
在本发明所述的显示面板驱动电路中，所述三维启动模式的启动能量大于所述二维启动模式的启动能量。
在本发明所述的显示面板驱动电路中，所述第二开关单元包括一电感，一第一场效应管，所述电感的一端连接至所述第一场效应管的漏极，还包括一第一电阻，所述第一电阻连接所述集成芯片的门控端口和所述第一场效应管栅极，一第三电阻，所述第三电阻连接所述集成芯片的电流侦测端口和所述第一场效应管源极，一第二电阻，所述第二电阻的一端连接至所述第一场效应管源极，另一端接地。
本发明还提供一种显示装置，包括面板驱动电路和光源驱动电路，所述光源驱动电路包括启动控制电路；
所述启动控制电路包括一第一开关单元，一启动控制单元，一第二开关单元，所述第一开关单元的输出端连接至所述启动控制单元的输入端，所述启动控制单元的输出端连接至所述第二开关单元的输入端，
所述第一开关单元用于根据不同的启动模式的输入信号确定所述启动控制单元的充电路径；
所述启动控制单元用于执行相应的启动模式，在与所述充电路径对应的充电时间存储所述相应的启动模式的启动能量，从而控制所述第二开关单元的开机瞬间的电流，所述充电时间为软启动时间；
所述第二开关单元通过接收所述启动控制单元所输出的门控信号控制外接电路。
在本发明所述的显示面板驱动电路中，所述启动模式包括二维启动模式和三维启动模式，所述充电路径包括第一充电路径和第二充电路径。
在本发明所述的显示面板驱动电路中，所述第一开关单元包括一源极接地的第二场效应管，所述第二场效应管的栅极接收所述二维启动模式或三维启动模式的输入信号，根据检测到的所述二维启动模式或三维启动模式的输入信号控制所述第二场效应管截止或导通。
在本发明所述的显示面板驱动电路中，所述启动控制单元包括一集成芯片，一第一电容和一第二电容，所述第一电容和第二电容的一端共同连接到所述集成芯片的软启动端口，所述第一电容的另一端连接至所述第二场效应管的源极，所述第二电容的另一端连接至所述第二场效应管的漏极；
在所述二维启动模式下，所述输入信号为低电平，所述第二场效应管截止，此时所述第一充电路径为对所述第一电容的充电路径，并在与所述第一电容对应的所述软启动时间里存储所述二维启动模式的启动能量；
在所述三维启动模式下，所述输入信号为高电平，所述第二场效应管导通，此时所述第二充电路径为对所述第一电容和第二电容的充电，并在与所述第一电容和第二电容对应的所述软启动时间存储所述三维启动模式的启动能量。
在本发明所述的显示面板驱动电路中，所述三维启动模式的启动能量大于所述二维启动模式的启动能量。
在本发明所述的显示面板驱动电路中，所述第二开关单元包括一电感，一第一场效应管，所述电感的一端连接至所述第一场效应管的漏极，还包括一第一电阻，所述第一电阻连接所述集成芯片的门控端口和所述第一场效应管栅极，一第三电阻，所述第三电阻连接所述集成芯片的电流侦测端口和所述第一场效应管源极，一第二电阻，所述第二电阻的一端连接至所述第一场效应管源极，另一端接地。
与现有技术相比，本发明的有益效果是：在不同的启动模式下的开机瞬间保护电感和场效应管。可根据不同的启动模式的输入信号确定启动控制单元的充电路径，执行相应的启动模式，在与充电路径对应的充电时间存储相应的启动模式的启动能量，从而防止开机瞬间的电流过大，特别是在启动模式为三维启动模式时，由于充电电容增加，从而延长软启动的时间，输出建立起来的时间也就更长，这样就能逐步积累更多的能量，从而防止在启动模式为三维启动模式时开机瞬间流过电感和场效应管的电流过大。本发明电路结构简单，成本低。
附图说明
图1是启动控制电路的电路框图；
图2是启动控制电路的一较佳实施例的电路结构示意图。
具体实施方式
为了解决现有的LED电视开机瞬间流过电感的电流过大而超过电感的饱和电流或者超过场效应管的额定电流规格的问题，采用了通过延长软启动时间，通过在现有电路的第一电容上并联了一个第二电容，利用电路高低电平原理来确定不同的充电路径，在与充电路径对应的充电时间（也就是软启动时间）存储相应的启动模式的启动能量，从而控制开机瞬间的电流，由于本发明采用增加一个充电路径，通过改变相应充电电容C的值，实现不同的启动模式下执行不同的软启动时间，来达到消除了开机瞬间电流过大问题，实现了保护电路的目的。
参照图1，是启动控制电路的电路框图，其中，包括一第一开关单元100，一启动控制单元200，一第二开关单元300，第一开关单元100的输出端连接至启动控制单元200的输入端，启动控制单元200的输出端连接第二开关单元300的输入端。第一开关单元100用于根据不同的启动模式的输入信号确定所述启动控制单元200的充电路径；启动控制单元200用于执行相应的启动模式，在与所述充电路径对应的充电时间存储所述相应的启动模式的启动能量，从而控制所述第二开关单元300的开机瞬间的电流，所述充电时间为软启动时间；所述第二开关单元300通过接收所述启动控制单元200所输出的门控信号控制外接电路。
参照图2，是启动控制电路的一较佳实施例的电路结构示意图，第二场效应管Q2通过栅极检测输入的不同启动模式的输入信号，第二场效应管Q2的漏极与第二电容C2连接，源极连接到集成芯片U1的公共接地信号端2，第二电容C2的另一端连接到集成芯片U1的软启动端口1， 第一电容C1的两端直接连接到集成芯片U1的软启动端口1和公共接地端口2，集成芯片U1的门控端口4通过第一电阻R1连接到第一场效应管Q1的栅极，集成芯片U1的电流侦测端口3通过第三电阻R3连接到第一场效应管Q1的源极，第一场效应管Q1的源极经过第二电阻R2连接到公共接地信号，第一场效应管Q1的漏极通过一电感L1连接到电源Vin，集成芯片U1为普通控制芯片，型号不定，此为该领域的公知技术，此处不再赘述。
本发明一种启动控制电路，所采用的启动模式包括二维启动模式和三维启动模式，也就是LED的2D和3D模式，所述三维启动模式的启动能量大于所述二维启动模式的启动能量。所述充电路径包括第一充电路径和第二充电路径。第一充电路径为第一电容C1充电，第二充电路径为第一电容C1和第二电容C2同时充电。在所述的集成芯片U1内部，在软启动端口1会产生一个恒定的电流Iss给连接在所述软启动端口1的电容充电，当所述软启动端口1的的电压超过集成芯片U1内部的一个固定电压Vss时，软启动就结束，软启动时间即为所述充电路径中所述电容充电的时间，所述电容的充电公式为：t=c*u/I。
在二维启动模式时，输入信号为低电平，第二场效应管Q2的栅极检测所述输入信号为低电平时，第二场效应管Q2截止，断开对第二电容C2的充电，此时所述第一开关单元100中的第二场效应管的截止决定了所述启动控制单元200中的电容充电路径为所述第一充电路径，此时所述软启动时间为所述第一电容C1充电时间，即二维启动模式时，软启动的时间为（C1*Vss）/Iss；
而在三维启动模式时，输入信号为高电平，此时第二场效应管Q2导通，决定了所述启动控制单元200中的电容充电路径为所述第二充电路径，此时所述第二充电路径为第一电容C1和第二电容C2的充电，充电电容等效于第一电容和第二电容并联，也就是电容值等效于两个电容值相加（C1+C2），即三维启动模式时，软启动的时间为（C1+C2）*Vss/Iss。
显然三维启动模式下软启动时间更长，现有技术二维启动模式和三维启动模式下，启动瞬间充电电容相同都为C1，故软启动时间也相同都为（C1*Vss）/Iss。而在三维启动模式时，流过LED的最大电流比二维启动模式要大很多，则三维启动模式时输出电压Vo比二维启动模式时也要大，导致在启动模式为三维启动模式时开机瞬间需要提供的能量更大，流过所述第二开关单元300中电感L1和第一场效应管Q1的电流过大，据此，本发明改善了软启动路径，实现不同的启动模式执行不同软启动路径，与现有技术对比延长了软启动时间，输出建立起来的时间也就更长，这样就能够达到逐步积累更多的能量的效果，从而防止开机瞬间流过电感和场效应管的电流过大。
在本发明一种启动控制电路中，所述启动控制单元200中的集成芯片U1在软启动结束后，可以从门控端口4输出门控信号到所述第二开关单元300中第一场效应管Q1的栅极，实现控制后续连接电路的开关。同时所述集成芯片U1的电流侦测端口3来控制后续连接电路中开关电源的功率。参照图1，第二开关单元300外接了一LED灯串显示单元，所述集成芯片U1的门控端口4控制所述LED灯串显示单元的开关，所述集成芯片U1的电流侦测端口3控制所述LED灯串显示单元的开关电源的功率，此为本领域的公知技术，此处不再赘述。
本发明还公开了一种显示面板驱动电路及显示装置，该显示面板驱动电路及显示装置，均包括面板驱动电路和光源驱动电路，其中光源驱动电路包括上述实施例的启动控制电路。面部驱动电路和光源驱动电路为本领域的公知技术，此处不再赘述。
应当理解的是，对本领域普通技术人员来说，可以根据上述说明加以改进或变换，而所有这些改进和变换都应属于本发明所附权利要求的保护范围。

Claims (18)

  1. 一种启动控制电路，其中，包括一第一开关单元，一启动控制单元，一第二开关单元，所述第一开关单元的输出端连接至所述启动控制单元的输入端，所述启动控制单元的输出端连接至所述第二开关单元的输入端，
    所述第一开关单元用于根据不同的启动模式的输入信号确定所述启动控制单元的充电路径；
    所述启动控制单元用于执行相应的启动模式，在与所述充电路径对应的充电时间存储所述相应的启动模式的启动能量，从而控制所述第二开关单元的开机瞬间的电流，所述充电时间为软启动时间；
    所述第二开关单元通过接收所述启动控制单元所输出的门控信号控制外接电路。
  2. 根据权利要求1所述启动控制电路，其中，所述启动模式包括二维启动模式和三维启动模式，所述充电路径包括第一充电路径和第二充电路径。
  3. 根据权利要求2所述的启动控制电路，其中， 所述第一开关单元包括一源极接地的第二场效应管，所述第二场效应管的栅极接收所述二维启动模式或三维启动模式的输入信号，根据检测到的所述二维启动模式或三维启动模式的输入信号控制所述第二场效应管截止或导通。
  4. 根据权利要求3所述的启动控制电路，其中，所述启动控制单元包括一集成芯片，一第一电容和一第二电容，所述第一电容和第二电容的一端共同连接到所述集成芯片的软启动端口，所述第一电容的另一端连接至所述第二场效应管的源极，所述第二电容的另一端连接至所述第二场效应管的漏极；
    在所述二维启动模式下，所述输入信号为低电平，所述第二场效应管截止，此时所述第一充电路径为对所述第一电容的充电路径，并在与所述第一电容对应的所述软启动时间里存储所述二维启动模式的启动能量；
    在所述三维启动模式下，所述输入信号为高电平，所述第二场效应管导通，此时所述第二充电路径为对所述第一电容和第二电容的充电，并在与所述第一电容和第二电容对应的所述软启动时间存储所述三维启动模式的启动能量。
  5. 根据权利要求4所述的启动控制电路，其中，所述三维启动模式的启动能量大于所述二维启动模式的启动能量。
  6. 根据权利要求5所述的启动控制电路，其中，所述第二开关单元包括一电感，一第一场效应管，所述电感的一端连接至所述第一场效应管的漏极，还包括一第一电阻，所述第一电阻连接所述集成芯片的门控端口和所述第一场效应管栅极，一第三电阻，所述第三电阻连接所述集成芯片的电流侦测端口和所述第一场效应管源极，一第二电阻，所述第二电阻的一端连接至所述第一场效应管源极，另一端接地。
  7. 一种显示面板驱动电路，包括面板驱动电路和光源驱动电路，其中，所述光源驱动电路包括启动控制电路；
    所述启动控制电路包括一第一开关单元，一启动控制单元，一第二开关单元，所述第一开关单元的输出端连接至所述启动控制单元的输入端，所述启动控制单元的输出端连接至所述第二开关单元的输入端，
    所述第一开关单元用于根据不同的启动模式的输入信号确定所述启动控制单元的充电路径；
    所述启动控制单元用于执行相应的启动模式，在与所述充电路径对应的充电时间存储所述相应的启动模式的启动能量，从而控制所述第二开关单元的开机瞬间的电流，所述充电时间为软启动时间；
    所述第二开关单元通过接收所述启动控制单元所输出的门控信号控制外接电路。
  8. 根据权利要求7所述的显示面板驱动电路，其中，所述启动模式包括二维启动模式和三维启动模式，所述充电路径包括第一充电路径和第二充电路径。
  9. 根据权利要求8所述的显示面板驱动电路，其中，所述第一开关单元包括一源极接地的第二场效应管，所述第二场效应管的栅极接收所述二维启动模式或三维启动模式的输入信号，根据检测到的所述二维启动模式或三维启动模式的输入信号控制所述第二场效应管截止或导通。
  10. 根据权利要求9所述的显示面板驱动电路，其中，所述启动控制单元包括一集成芯片，一第一电容和一第二电容，所述第一电容和第二电容的一端共同连接到所述集成芯片的软启动端口，所述第一电容的另一端连接至所述第二场效应管的源极，所述第二电容的另一端连接至所述第二场效应管的漏极；
    在所述二维启动模式下，所述输入信号为低电平，所述第二场效应管截止，此时所述第一充电路径为对所述第一电容的充电路径，并在与所述第一电容对应的所述软启动时间里存储所述二维启动模式的启动能量；
    在所述三维启动模式下，所述输入信号为高电平，所述第二场效应管导通，此时所述第二充电路径为对所述第一电容和第二电容的充电，并在与所述第一电容和第二电容对应的所述软启动时间存储所述三维启动模式的启动能量。
  11. 根据权利要求10所述的显示面板驱动电路，其中，所述三维启动模式的启动能量大于所述二维启动模式的启动能量。
  12. 根据权利要求11所述的显示面板驱动电路，其中，所述第二开关单元包括一电感，一第一场效应管，所述电感的一端连接至所述第一场效应管的漏极，还包括一第一电阻，所述第一电阻连接所述集成芯片的门控端口和所述第一场效应管栅极，一第三电阻，所述第三电阻连接所述集成芯片的电流侦测端口和所述第一场效应管源极，一第二电阻，所述第二电阻的一端连接至所述第一场效应管源极，另一端接地。
  13. 一种显示装置，包括面板驱动电路和光源驱动电路，其中，所述光源驱动电路包括启动控制电路；
    所述启动控制电路包括一第一开关单元，一启动控制单元，一第二开关单元，所述第一开关单元的输出端连接至所述启动控制单元的输入端，所述启动控制单元的输出端连接至所述第二开关单元的输入端，
    所述第一开关单元用于根据不同的启动模式的输入信号确定所述启动控制单元的充电路径；
    所述启动控制单元用于执行相应的启动模式，在与所述充电路径对应的充电时间存储所述相应的启动模式的启动能量，从而控制所述第二开关单元的开机瞬间的电流，所述充电时间为软启动时间；
    所述第二开关单元通过接收所述启动控制单元所输出的门控信号控制外接电路。
  14. 根据权利要求13所述的显示面板驱动电路，其中，所述启动模式包括二维启动模式和三维启动模式，所述充电路径包括第一充电路径和第二充电路径。
  15. 根据权利要求14所述的显示装置，其中，所述第一开关单元包括一源极接地的第二场效应管，所述第二场效应管的栅极接收所述二维启动模式或三维启动模式的输入信号，根据检测到的所述二维启动模式或三维启动模式的输入信号控制所述第二场效应管截止或导通。
  16. 根据权利要求15所述的显示装置，其中，所述启动控制单元包括一集成芯片，一第一电容和一第二电容，所述第一电容和第二电容的一端共同连接到所述集成芯片的软启动端口，所述第一电容的另一端连接至所述第二场效应管的源极，所述第二电容的另一端连接至所述第二场效应管的漏极；
    在所述二维启动模式下，所述输入信号为低电平，所述第二场效应管截止，此时所述第一充电路径为对所述第一电容的充电路径，并在与所述第一电容对应的所述软启动时间里存储所述二维启动模式的启动能量；
    在所述三维启动模式下，所述输入信号为高电平，所述第二场效应管导通，此时所述第二充电路径为对所述第一电容和第二电容的充电，并在与所述第一电容和第二电容对应的所述软启动时间存储所述三维启动模式的启动能量。
  17. 根据权利要求16所述的显示装置，其中，所述三维启动模式的启动能量大于所述二维启动模式的启动能量。
  18. 根据权利要求17所述的显示装置，其中，所述第二开关单元包括一电感，一第一场效应管，所述电感的一端连接至所述第一场效应管的漏极，还包括一第一电阻，所述第一电阻连接所述集成芯片的门控端口和所述第一场效应管栅极，一第三电阻，所述第三电阻连接所述集成芯片的电流侦测端口和所述第一场效应管源极，一第二电阻，所述第二电阻的一端连接至所述第一场效应管源极，另一端接地。
PCT/CN2013/077873 2013-04-24 2013-06-25 一种启动控制电路以及显示面板驱动电路及显示装置 WO2014172985A1 (zh)

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