WO2014101313A1 - 一种液晶显示装置的驱动电路、驱动方法和液晶显示装置 - Google Patents

一种液晶显示装置的驱动电路、驱动方法和液晶显示装置 Download PDF

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Publication number
WO2014101313A1
WO2014101313A1 PCT/CN2013/070101 CN2013070101W WO2014101313A1 WO 2014101313 A1 WO2014101313 A1 WO 2014101313A1 CN 2013070101 W CN2013070101 W CN 2013070101W WO 2014101313 A1 WO2014101313 A1 WO 2014101313A1
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Prior art keywords
liquid crystal
display device
crystal display
controllable switch
coupled
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PCT/CN2013/070101
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English (en)
French (fr)
Inventor
张先明
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深圳市华星光电技术有限公司
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Application filed by 深圳市华星光电技术有限公司 filed Critical 深圳市华星光电技术有限公司
Priority to US13/809,495 priority Critical patent/US9230493B2/en
Publication of WO2014101313A1 publication Critical patent/WO2014101313A1/zh

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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/34Control 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
    • G09G3/3406Control of illumination source

Definitions

  • the present invention relates to the field of liquid crystal display, and more particularly to a driving circuit, a driving method, and a liquid crystal display device of a liquid crystal display device.
  • the liquid crystal display device comprises a driving circuit of the liquid crystal display device, the driving circuit of the liquid crystal display device comprises a light bar for providing a light source to the liquid crystal display device, and a driving module for driving the light bar, the driving module is connected to the light bar through the driving line, and the driving line is connected There is an electrolytic capacitor.
  • the driving circuit of the liquid crystal display device comprises a light bar for providing a light source to the liquid crystal display device, and a driving module for driving the light bar, the driving module is connected to the light bar through the driving line, and the driving line is connected
  • an electrolytic capacitor When the power is turned on and off quickly, the charge on the electrolytic capacitor cannot be quickly discharged, and flickering occurs when the power is turned on again. As shown in FIG.
  • discharge resistors R1 and R2 are generally connected in parallel between the drive line Vout and the ground GND of the entire circuit (that is, in parallel across the electrolytic capacitor C), but In order to completely solve the problem of flashing of the switch, the technical solution needs to connect more resistors in parallel, and as the number of resistors increases, the power consumed is higher, resulting in lower efficiency of the whole machine.
  • the technical problem to be solved by the present invention is to provide a driving circuit, a driving method, and a liquid crystal display device of a liquid crystal display device which can solve the problem of booting flicker and improve efficiency.
  • a driving circuit for a liquid crystal display device includes a driving line for driving a light bar of the liquid crystal display device, and a discharge module and a switch module are sequentially connected in series between the driving line and a ground end of a driving circuit of the liquid crystal display device;
  • the liquid crystal display device output enable signal is coupled to the switch module;
  • the switch module When the start signal is a shutdown signal, the switch module is turned on; when the start signal is a power on signal, the switch module is turned off.
  • the switch module includes a first controllable switch connected in series between the discharge module and a ground end of the driving circuit of the liquid crystal display device, and a control coupled to the control end of the first controllable switch Control unit
  • the monitoring unit drives the first controllable switch to be turned on when the liquid crystal display device outputs a shutdown signal, and drives the first controllable switch to be turned off when the liquid crystal display device outputs a power-on signal.
  • the circuit is a circuit that controls the discharge of the discharge module by using a controllable switch.
  • the first controllable switch is turned on when the liquid crystal display device is turned off, and the capacitor can be discharged through the discharge module; when the liquid crystal display device is turned on, the first controllable switch is turned off. , cut off the discharge circuit of the discharge module, the discharge module does not work, and does not generate additional energy consumption.
  • the monitoring unit includes a second controllable switch coupled to a ground end of the driving circuit of the liquid crystal display device, a voltage dividing resistor coupled to the second controllable switch, and a reference voltage coupled to the voltage dividing resistor; a control end of the second controllable switch coupled to the enable signal;
  • the shutdown signal outputted by the liquid crystal display device is a low level signal; the output of the power-on signal is a high level signal; and the first controllable switch and the second controllable switch are driven to be turned on by the low level signal.
  • This is the circuit structure of the first type of monitoring unit; the first and second controllable switches are all low-level conduction, so that the same type of controllable switching device (such as MOS tube) can be selected to improve the universality of the device.
  • the action logic of the two controllable switches is reversed, there is a risk of error in the production process; the controllable switch with the same action logic can effectively avoid human error, facilitate production, and improve product yield.
  • the monitoring unit includes a voltage dividing resistor coupled to a ground end of the driving circuit of the liquid crystal display device, a second controllable switch coupled to the voltage dividing resistor, and a reference voltage coupled to the second controllable switch; a control end of the second controllable switch coupled to the enable signal;
  • the shutdown signal outputted by the liquid crystal display device is a low level signal; the output start signal is a high level signal; the first controllable switch is driven to be turned on by a low level signal, and the second controllable switch is The high level signal drives the conduction. This is the circuit structure of the second monitoring unit.
  • the monitoring unit includes a voltage dividing resistor coupled to a ground end of the driving circuit of the liquid crystal display device, a second controllable switch coupled to the voltage dividing resistor, and a reference voltage coupled to the second controllable switch; a control terminal of the second controllable switch is coupled to the enable signal by a logic flipper;
  • the shutdown signal outputted by the liquid crystal display device is a low level signal; the power-on signal outputted by the liquid crystal display device is a high level signal; and the first controllable switch and the second controllable switch are driven to be turned on by a high level signal.
  • This is the first The circuit structure of the three monitoring units; the first and second controllable switches are all high-level conduction, so that the same type of controllable switching device (such as MOS tube) can be selected to improve the universality of the device, and if The action logic of the two controllable switches is opposite, and there is a risk of error in the production process; the controllable switch with the same action logic can effectively avoid human error, facilitate production, and improve product yield.
  • the discharge module includes a plurality of discharge resistors arranged in parallel, one end of the discharge resistor is connected to the drive line, and the other end is coupled to the switch module.
  • This is a specific discharge module circuit structure, the cost of the resistor is low, and the discharge power can be increased in parallel to facilitate expansion.
  • a driving method of a driving circuit of a liquid crystal display device comprising the steps of:
  • the discharge module and the switch module are sequentially connected in series between the driving line and the ground end of the driving circuit of the liquid crystal display device;
  • the control switch module When the driving circuit of the liquid crystal display device is turned off, the control switch module is turned on; when the driving circuit of the liquid crystal display device is turned on, the control switch module is turned off.
  • the switch module includes a first controllable switch connected in series between the discharge module and a ground end of the driving circuit of the liquid crystal display device, and the first controllable switch is controlled End-coupled monitoring unit;
  • the step B includes: when the driving circuit of the liquid crystal display device is turned off, the monitoring unit drives the first controllable switch to be turned on; when the driving circuit of the liquid crystal display device is turned on, the monitoring unit drives the first controllable switch to be turned off.
  • the circuit is a circuit that controls the discharge of the discharge module by using a controllable switch.
  • the first controllable switch is turned on when the liquid crystal display device is turned off, and the capacitor can be discharged through the discharge module; when the liquid crystal display device is turned on, the first controllable switch is turned off. , cut off the discharge circuit of the discharge module, the discharge module does not work, and does not generate additional energy consumption.
  • a liquid crystal display device comprising a driving circuit of a liquid crystal display device according to the present invention.
  • the inventors have found that in the prior art, in order to quickly discharge the capacitor when the liquid crystal display device is turned off, a plurality of resistors need to be connected in parallel for discharging, but the resistor is still in working state when the liquid crystal display device is normally displayed, and continues to consume power. Increased power consumption and reduced overall efficiency; Improve efficiency, can only reduce the use of resistors, but the resistance is reduced, the time of capacitor discharge will increase, the effect is not obvious, especially in the case of multiple output electrolytic capacitors connected in parallel, there will still be flashing when switching on and off quickly. problem.
  • the present invention sequentially connects a discharge module and a switch module between the drive line and the ground end of the drive circuit of the liquid crystal display device; the switch module is turned on when the liquid crystal display device outputs a shutdown signal to form a discharge loop.
  • the capacitor is discharged through the discharge module; when the liquid crystal display device outputs the power-on signal, it is turned off, thus cutting off the discharge circuit of the discharge module, and the discharge module is not put into use when the liquid crystal display device is working normally, and naturally, the power is not lost, and Increase the power consumption of the liquid crystal display device in the power-on state.
  • the power of the discharge module can be increased by connecting more resistors and the like. Since the discharge module is only put into use in the off state, the power level of the discharge module itself does not affect the whole liquid crystal display device. The efficiency, so that the booting problem can be completely solved without reducing the efficiency of the whole machine.
  • Figure 1 is a schematic diagram of the principle of the prior art
  • Figure 2 is a schematic block diagram of the principle of the present invention.
  • Embodiment 1 of the present invention is a schematic diagram of the principle of Embodiment 1 of the present invention.
  • Figure 5 is a schematic diagram of the principle of the third embodiment of the present invention.
  • Figure 6 is a schematic illustration of the process of the invention.
  • a liquid crystal display device including a driving circuit of a liquid crystal display device.
  • the driving circuit of the liquid crystal display device includes a driving line 6 for driving the light bar 2 of the liquid crystal display device, and the discharging module 3 and the switching module are sequentially connected in series between the driving line 6 and the grounding end of the driving circuit of the liquid crystal display device. 4; the liquid crystal display device output enable signal is coupled to the switch module 4; When the start signal is the shutdown signal, the switch module 4 is turned on; when the start signal is the power-on signal, the switch module 4 is turned off.
  • the inventors have found that in the prior art, in order to quickly discharge the capacitor when the liquid crystal display device is turned off, a plurality of resistors need to be connected in parallel for discharging, but the resistor is still in working state when the liquid crystal display device is normally displayed, and continues to consume power. Increased power consumption and reduced efficiency of the whole machine; In order to improve efficiency, only the use of resistors can be reduced, but the resistance is reduced, the time of capacitor discharge is increased, and the effect is less obvious, especially in multiple output electrolytic capacitors. In the case of parallel connection, there will still be flicker problems when switching on and off quickly.
  • the present invention sequentially connects the discharge module 3 and the switch module 4 between the drive line 6 and the ground terminal of the drive circuit of the liquid crystal display device; the switch module 4 is turned on when the liquid crystal display device outputs a shutdown signal.
  • Forming a discharge circuit the capacitor is discharged through the discharge module 3; when the liquid crystal display device outputs a power-on signal, it is turned off, thus cutting off the discharge circuit of the discharge module 3, and the discharge module 3 is not put into use when the liquid crystal display device is working normally, naturally It does not consume power and does not increase the power consumption of the liquid crystal display device.
  • the power of the discharge module 3 can be increased by paralleling more resistors and the like.
  • the discharge module 3 Since the discharge module 3 is only put into use in the off state, the power level of the discharge module 3 does not affect the liquid crystal display. The efficiency of the whole machine can be solved, so that the problem of booting flicker can be completely solved without reducing the efficiency of the whole machine.
  • the driving circuit of the liquid crystal display device includes a backlight module.
  • the backlight module includes a light bar 2 and a driving module 1 for driving the light bar 2.
  • the driving module 1 is connected to the light bar 2 through the driving line 6, and the driving line 6 and a discharge module 3 and a switch module 4 are connected in series between the ground terminal GND of the driving circuit of the liquid crystal display device; an electrolytic capacitor C is also connected; and the liquid crystal display device output enable signal is coupled to the switch module 4.
  • the discharge module 3 includes a plurality of discharge resistors arranged in parallel (R1 ⁇ R4 in the figure), the discharge resistance is 100 ⁇ ⁇ , one end of the discharge resistor is connected to the control line drive line 6, and the other end is coupled with the switch module 4.
  • the discharge module 3 selects a resistor, which is low in cost, and can increase the discharge power in parallel to facilitate expansion.
  • the switch module 4 includes a ground terminal connected in series to the discharge circuit 3 and the driving circuit of the liquid crystal display device a first controllable switch Q1 between GND and a monitoring unit 5 coupled to the control terminal of the first controllable switch Q1;
  • the monitoring unit 5 includes a second controllable switch Q2 coupled to the ground GND of the driving circuit of the liquid crystal display device a voltage dividing resistor R5 coupled to the second controllable switch Q2, and a reference voltage coupled to the voltage dividing resistor R5; a control end of the second controllable switch Q2 coupled to the enable signal;
  • the shutdown signal outputted by the liquid crystal display device is a low level signal; the power-on signal outputted by the liquid crystal display device is a high level signal; and the first controllable switch Q1 and the second controllable switch Q2 are driven to be turned on by the low level signal.
  • the first controllable switch Q1 is turned on when the liquid crystal display device is turned off, and the capacitor can be discharged through the discharge module 3; when the liquid crystal display device is turned on, the first controllable switch Q1 is turned off.
  • the discharge circuit of the discharge module 3 is cut off, and the discharge module 3 is not operated, and no additional energy consumption is generated.
  • the first and second controllable switches (Ql, Q2) are all turned on at a low level, so that the same type of controllable switching device (such as a MOS tube) can be selected to improve the universality of the device. If the action logic of the two controllable switches is reversed, there is a risk of error in the production process; the controllable switch with the same action logic can effectively avoid human error, facilitate production, and improve product yield.
  • the driving circuit of the liquid crystal display device includes a backlight module.
  • the backlight module includes a light bar 2 and a driving module 1 for driving the light bar 2.
  • the driving module 1 is connected to the light bar 2 through the driving line 6, and the driving line 6 and a discharge module 3 and a switch module 4 are connected in series between the ground terminal GND of the driving circuit of the liquid crystal display device; an electrolytic capacitor C is also connected; and the liquid crystal display device output enable signal is coupled to the switch module 4.
  • the discharge module 3 includes a plurality of discharge resistors arranged in parallel (R1 ⁇ R4 in the figure), the discharge resistance is 100 ⁇ ⁇ , one end of the discharge resistor is connected to the control line drive line 6, and the other end is coupled with the switch module 4.
  • the discharge module 3 selects a resistor, which is low in cost, and can increase the discharge power in parallel to facilitate expansion.
  • the switch module 4 includes a first controllable switch Q1 connected in series between the discharge module 3 and the ground GND of the drive circuit of the liquid crystal display device, and a monitoring unit 5 coupled to the control end of the first controllable switch Q1;
  • the monitoring unit 5 includes a voltage dividing resistor R5 coupled to a ground terminal GND of the driving circuit of the liquid crystal display device, a second controllable switch Q2 coupled to the voltage dividing resistor R5, and a reference voltage coupled to the second controllable switch Q2; a control end of the second controllable switch Q2 is coupled to the enable signal;
  • the shutdown signal outputted by the liquid crystal display device is a low level signal; the output signal of the output is a high level signal; the first controllable switch Q1 is driven by a low level signal, and the second controllable switch Q2 is a high level signal.
  • the drive is turned on.
  • the discharge circuit of the discharge module 3 is cut off, and the discharge module 3 is not operated, and no additional energy consumption is generated.
  • the driving circuit of the liquid crystal display device includes a backlight module.
  • the backlight module includes a light bar 2 and a driving module 1 for driving the light bar 2.
  • the driving module 1 is connected to the light bar 2 through the driving line 6, and the driving line 6 and a discharge module 3 and a switch module 4 are connected in series between the ground terminal GND of the driving circuit of the liquid crystal display device; an electrolytic capacitor C is also connected; and the liquid crystal display device output enable signal is coupled to the switch module 4.
  • the discharge module 3 includes a plurality of discharge resistors arranged in parallel (R1 ⁇ R4 in the figure), the discharge resistance is 100 ⁇ ⁇ , one end of the discharge resistor is connected to the control line drive line 6, and the other end is coupled with the switch module 4.
  • the discharge module 3 selects a resistor, which is low in cost, and can increase the discharge power in parallel to facilitate expansion.
  • the switch module 4 includes a first controllable switch Q1 connected in series between the discharge module 3 and the ground GND of the drive circuit of the liquid crystal display device, and a monitoring unit 5 coupled to the control end of the first controllable switch Q1;
  • the monitoring unit 5 includes a voltage dividing resistor R5 coupled to a ground terminal GND of the driving circuit of the liquid crystal display device, a second controllable switch Q2 coupled to the voltage dividing resistor R5, a reference voltage coupled to the second controllable switch Q2, and a second controllable switch Q2
  • the control terminal is coupled to the enable signal by a logic flipper 7;
  • the shutdown signal outputted by the liquid crystal display device is a low level signal; the power-on signal outputted by the liquid crystal display device is a high level signal; the first controllable switch Q1 and the second controllable switch Q2 are driven to be turned on by the high level signal.
  • the first controllable switch Q1 is turned on when the liquid crystal display device is turned off, and the capacitor can be discharged through the discharge module 3; when the liquid crystal display device is turned on, the first controllable switch Q1 is turned off. Break, cut off the discharge circuit of the discharge module 3, the discharge module 3 does not work, and will not generate an amount External energy consumption.
  • the first and second controllable switches (Q1 and Q2) are both turned on at a high level, so that the same type of controllable switching device (such as a MOS tube) can be selected to improve the universality of the device. If the action logic of the two controllable switches is reversed, there is a risk of error in the production process; the controllable switch with the same action logic can effectively avoid human error, facilitate production, and improve product yield.
  • the present invention also discloses a driving method of a driving circuit of a liquid crystal display device, including the steps of:
  • control switch module 4 When the driving circuit of the liquid crystal display device is turned off, the control switch module 4 is turned on; when the driving circuit of the liquid crystal display device is turned on, the control switch module 4 is turned off.
  • the switch module 4 includes a first controllable switch Q1 connected in series between the discharge module 3 and the ground terminal GND of the driving circuit of the liquid crystal display device, and a monitoring unit 5 coupled to the control end of the first controllable switch Q1;
  • Step B includes: when the driving circuit of the liquid crystal display device is turned off, the monitoring unit 5 drives the first controllable switch Q1 to be turned on; when the driving circuit of the liquid crystal display device is turned on, the monitoring unit 5 drives the first controllable switch Q1 to be turned off.
  • This is a circuit for controlling discharge of the discharge module 3 by using a controllable switch.
  • the first controllable switch Q1 is turned on when the liquid crystal display device is turned off, and the capacitor can be discharged through the discharge module 3; when the liquid crystal display device is turned on, the first controllable The switch Q1 is turned off, the discharge circuit of the discharge module 3 is cut off, and the discharge module 3 is not operated, and no additional energy consumption is generated.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
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Abstract

一种液晶显示装置的驱动电路、驱动方法和液晶显示装置。所述驱动电路包括驱动液晶显示装置的灯条(2)的驱动线(6)。在驱动线(6)和液晶显示装置的驱动电路的接地端之间依次串联有放电模块(3)和开关模块(4)。液晶显示装置输出启动信号耦合到所述开关模块(4)。启动信号为关机信号时,开关模块(4)导通;启动信号为开机信号时,开关模块(4)关断。该驱动电路可以在不降低整机效率的前提下解决开机闪烁的问题。

Description

一种液晶显示装置的驱动电路、 驱动方法和液晶显示装置
【技术领域】
本发明涉及液晶显示领域, 更具体的说, 涉及一种液晶显示装置的驱动电 路、 驱动方法和液晶显示装置。
【背景技术】
液晶显示装置包括液晶显示装置的驱动电路, 液晶显示装置的驱动电路包 括给液晶显示装置提供光源的灯条, 以及驱动灯条的驱动模块, 驱动模块通过 驱动线连接到灯条, 驱动线上连接有电解电容, 在快速开关机的时候该电解电 容上的电荷不能快速放完, 在重新开机的时候会发生闪烁的现象。 如图 1所示, 现有技术为了解决这一问题, 一般都在驱动线 Vout和整个电路的接地端 GND 之间并联(即在电解电容 C两端并联)放电电阻(R1和 R2 ), 但该技术方案为 了彻底解决开关机闪烁的问题, 需要并联较多的电阻, 随着电阻数量的增加, 其耗费的电能也越高, 造成整机效率降低。
【发明内容】
本发明所要解决的技术问题是提供一种能解决开机闪烁问题并改善效率的 液晶显示装置的驱动电路、 驱动方法和液晶显示装置。
本发明的目的是通过以下技术方案来实现的:
一种液晶显示装置的驱动电路, 包括驱动所述液晶显示装置的灯条的驱动 线, 所述驱动线和所述液晶显示装置的驱动电路的接地端之间依次串联有放电 模块和开关模块; 所述液晶显示装置输出启动信号耦合到所述开关模块;
所述启动信号为关机信号时, 所述开关模块导通; 所述启动信号为开机信 号时, 所述开关模块关断。
进一步的, 所述开关模块包括串联在所述放电模块和所述液晶显示装置的 驱动电路的接地端之间的第一可控开关、 与所述第一可控开关控制端耦合的监 控单元;
所述监控单元在所述液晶显示装置输出关机信号时驱动所述第一可控开关 导通, 在所述液晶显示装置输出开机信号时驱动所述第一可控开关关断。 此为 一种利用可控开关控制放电模块放电的电路, 第一可控开关在液晶显示装置关 机时导通, 电容可以通过放电模块放电; 当液晶显示装置开机后, 第一可控开 关关断, 切断放电模块的放电回路, 放电模块不工作, 不会产生额外的能耗。
进一步的, 所述监控单元包括与液晶显示装置的驱动电路的接地端耦合的 第二可控开关、 与第二可控开关耦合的分压电阻、 与分压电阻耦合的基准电压; 所述第二可控开关的控制端耦合到所述启动信号;
所述液晶显示装置输出的关机信号为低电平信号; 其输出的开机信号为高 电平信号; 所述第一可控开关和第二可控开关由低电平信号驱动导通。 此为第 一种监控单元的电路结构; 第一和第二可控开关都是低电平导通, 这样就可以 选用同一型号的可控开关器件(如 MOS管), 提高器件的通用率, 另外, 如果 两个可控开关的动作逻辑相反, 在生产过程中存在接错的风险; 选用相同动作 逻辑的可控开关则可以有效避免人为失误, 方便生产, 同时提高了产品良率。
进一步的, 所述监控单元包括与液晶显示装置的驱动电路的接地端耦合的 分压电阻、 与分压电阻耦合的第二可控开关、 与第二可控开关耦合的基准电压; 所述第二可控开关的控制端耦合到所述启动信号;
所述液晶显示装置输出的关机信号为低电平信号; 其输出的开机信号为高 电平信号; 所述第一可控开关由低电平信号驱动导通, 所述第二可控开关由高 电平信号驱动导通。 此为第二种监控单元的电路结构。
进一步的, 所述监控单元包括与液晶显示装置的驱动电路的接地端耦合的 分压电阻、 与分压电阻耦合的第二可控开关、 与第二可控开关耦合的基准电压; 所述第二可控开关的控制端通过一逻辑取反器耦合到所述启动信号;
所述液晶显示装置输出的关机信号为低电平信号; 其输出的开机信号为高 电平信号; 所述第一可控开关和第二可控开关由高电平信号驱动导通。 此为第 三种监控单元的电路结构; 第一和第二可控开关都是高电平导通, 这样就可以 选用同一型号的可控开关器件(如 MOS管), 提高器件的通用率, 另外, 如果 两个可控开关的动作逻辑相反, 在生产过程中存在接错的风险; 选用相同动作 逻辑的可控开关则可以有效避免人为失误, 方便生产, 同时提高了产品良率。
进一步的, 所述放电模块包括多个并联设置的放电电阻, 所述放电电阻的 一端连接所述驱动线, 另一端和所述开关模块耦合。 此为一种具体的放电模块 的电路结构, 电阻成本低廉, 且可以通过并联方式提升放电功率, 方便拓展。
进一步的, 所述放电电阻为 100ΚΩ。 此为一种具体的放电电阻的选型。 一种液晶显示装置驱动电路的驱动方法, 包括步骤:
Α、在驱动线和液晶显示装置的驱动电路的接地端之间依次串联放电模块和 开关模块;
Β、 在液晶显示装置的驱动电路关机时, 控制开关模块导通; 在液晶显示装 置的驱动电路开机时, 控制开关模块关断。
进一步的, 所述步骤 Α中, 所述开关模块包括串联在所述放电模块和所述 液晶显示装置的驱动电路的接地端之间的第一可控开关、 与所述第一可控开关 控制端耦合的监控单元;
所述步骤 B 包括: 在液晶显示装置的驱动电路关机时, 监控单元驱动第一 可控开关导通; 在液晶显示装置的驱动电路开机时, 监控单元驱动第一可控开 关关断。 此为一种利用可控开关控制放电模块放电的电路, 第一可控开关在液 晶显示装置关机时导通, 电容可以通过放电模块放电; 当液晶显示装置开机后, 第一可控开关关断, 切断放电模块的放电回路, 放电模块不工作, 不会产生额 外的能耗。
一种液晶显示装置, 包括本发明所述的一种液晶显示装置的驱动电路。 发明人研究发现, 现有技术为了在液晶显示装置关机的时候电容可以快速 放完电, 需要并联多个电阻进行放电, 但电阻在液晶显示装置正常显示的时候 仍然处于工作状态, 继续消耗电能, 增加了耗电量, 降低了整机的效率; 为了 提升效率, 只能减少电阻的使用, 但电阻减少, 电容放电的时间就会增加, 效 果就不太明显, 特别是在多颗输出电解电容并联的情况下, 快速开关机的时候 仍然会有闪烁问题。 面对这种两难的选择, 本发明在驱动线和液晶显示装置的 驱动电路的接地端之间依次串联放电模块和开关模块; 开关模块在液晶显示装 置输出关机信号时导通, 形成放电回路, 电容通过放电模块放电; 在液晶显示 装置输出开机信号时关断, 这样就切断了放电模块的放电回路, 放电模块在液 晶显示装置正常工作时不投入使用, 自然也就不会损耗电能, 不会增加液晶显 示装置开机状态的功耗。 为了加快电容在关机时的放电速度, 可以通过并联更 多电阻等方案增加放电模块的功率, 由于放电模块只在关机状态下投入使用, 放电模块自身的功率大小不会影响到液晶显示装置整机的效率, 这样就可以在 不降低整机效率的前提下, 彻底解决开机闪烁问题。
【附图说明】
图 1是现有技术的原理示意图;
图 2是本发明原理示意框图;
图 3是本发明实施例一的原理示意图;
图 4是本发明实施例二的原理示意图;
图 5是本发明实施例三的原理示意图;
图 6是本发明方法示意图。
【具体实施方式】
本发明公开了一种液晶显示装置, 液晶显示装置包括液晶显示装置的驱动 电路。
如图 2所示, 液晶显示装置的驱动电路包括驱动液晶显示装置的灯条 2的 驱动线 6,驱动线 6和液晶显示装置的驱动电路的接地端之间依次串联有放电模 块 3和开关模块 4; 液晶显示装置输出启动信号耦合到开关模块 4; 启动信号为关机信号时, 开关模块 4导通; 启动信号为开机信号时, 开关 模块 4关断。
发明人研究发现, 现有技术为了在液晶显示装置关机的时候电容可以快速 放完电, 需要并联多个电阻进行放电, 但电阻在液晶显示装置正常显示的时候 仍然处于工作状态, 继续消耗电能, 增加了耗电量, 降低了整机的效率; 为了 提升效率, 只能减少电阻的使用, 但电阻减少, 电容放电的时间就会增加, 效 果就不太明显, 特别是在多颗输出电解电容并联的情况下, 快速开关机的时候 仍然会有闪烁问题。 面对这种两难的选择, 本发明在驱动线 6和液晶显示装置 的驱动电路的接地端之间依次串联放电模块 3和开关模块 4;开关模块 4在液晶 显示装置输出关机信号时导通, 形成放电回路, 电容通过放电模块 3放电; 在 液晶显示装置输出开机信号时关断, 这样就切断了放电模块 3 的放电回路, 放 电模块 3在液晶显示装置正常工作时不投入使用, 自然也就不会损耗电能, 不 会增加液晶显示装置开机状态的功耗。 为了加快电容在关机时的放电速度, 可 以通过并联更多电阻等方案增加放电模块 3的功率, 由于放电模块 3只在关机 状态下投入使用, 放电模块 3 自身的功率大小不会影响到液晶显示装置整机的 效率, 这样就可以在不降低整机效率的前提下, 彻底解决开机闪烁问题。
下面结合附图和较佳的实施例对本发明作进一步说明。
实施例一
参见图 2和图 3 , 液晶显示装置的驱动电路包括背光模组, 背光模组包括灯 条 2和驱动灯条 2的驱动模块 1 , 驱动模块 1通过驱动线 6连接到灯条 2, 驱动 线 6和液晶显示装置的驱动电路的接地端 GND之间依次串联有放电模块 3和开 关模块 4;还连接有电解电容 C; 液晶显示装置输出启动信号耦合到开关模块 4。
放电模块 3 包括多个并联设置的放电电阻(如图中 R1 ~ R4 ), 放电电阻为 100ΚΩ , 放电电阻的一端连接控制线驱动线 6, 另一端和开关模块 4耦合。 放 电模块 3选用电阻, 成本低廉, 且可以通过并联方式提升放电功率, 方便拓展。
开关模块 4 包括串联在放电模块 3 和液晶显示装置的驱动电路的接地端 GND之间的第一可控开关 Q1、与第一可控开关 Q1控制端耦合的监控单元 5; 监 控单元 5 包括与液晶显示装置的驱动电路的接地端 GND耦合的第二可控开关 Q2、 与第二可控开关 Q2耦合的分压电阻 R5、 与分压电阻 R5耦合的基准电压; 第二可控开关 Q2的控制端耦合到启动信号;
液晶显示装置输出的关机信号为低电平信号; 其输出的开机信号为高电平 信号; 第一可控开关 Q1和第二可控开关 Q2由低电平信号驱动导通。
此为第一种开关模块 4的具体电路形式,第一可控开关 Q1在液晶显示装置 关机时导通, 电容可以通过放电模块 3放电; 当液晶显示装置开机后, 第一可 控开关 Q1关断, 切断放电模块 3的放电回路, 放电模块 3不工作, 不会产生额 外的能耗。 本实施例中, 第一和第二可控开关 (Ql、 Q2 )都是低电平导通, 这 样就可以选用同一型号的可控开关器件 (如 MOS管), 提高器件的通用率, 另 外, 如果两个可控开关的动作逻辑相反, 在生产过程中存在接错的风险; 选用 相同动作逻辑的可控开关则可以有效避免人为失误, 方便生产, 同时提高了产 品良率。
实施例二
参见图 2和图 4, 液晶显示装置的驱动电路包括背光模组, 背光模组包括灯 条 2和驱动灯条 2的驱动模块 1 , 驱动模块 1通过驱动线 6连接到灯条 2, 驱动 线 6和液晶显示装置的驱动电路的接地端 GND之间依次串联有放电模块 3和开 关模块 4;还连接有电解电容 C; 液晶显示装置输出启动信号耦合到开关模块 4。
放电模块 3 包括多个并联设置的放电电阻(如图中 R1 ~ R4 ), 放电电阻为 100ΚΩ , 放电电阻的一端连接控制线驱动线 6, 另一端和开关模块 4耦合。 放 电模块 3选用电阻, 成本低廉, 且可以通过并联方式提升放电功率, 方便拓展。
开关模块 4 包括串联在放电模块 3 和液晶显示装置的驱动电路的接地端 GND之间的第一可控开关 Q1、与第一可控开关 Q1控制端耦合的监控单元 5; 监 控单元 5包括与液晶显示装置的驱动电路的接地端 GND耦合的分压电阻 R5、 与分压电阻 R5耦合的第二可控开关 Q2、 与第二可控开关 Q2耦合的基准电压; 第二可控开关 Q2的控制端耦合到启动信号;
液晶显示装置输出的关机信号为低电平信号; 其输出的开机信号为高电平 信号; 第一可控开关 Q1由低电平信号驱动导通, 第二可控开关 Q2由高电平信 号驱动导通。
此为第二种开关模块 4的具体电路形式,第一可控开关 Q1在液晶显示装置 关机时导通, 电容可以通过放电模块 3放电; 当液晶显示装置开机后, 第一可 控开关 Q1关断, 切断放电模块 3的放电回路, 放电模块 3不工作, 不会产生额 外的能耗。
实施例三
参见图 2和图 5, 液晶显示装置的驱动电路包括背光模组, 背光模组包括灯 条 2和驱动灯条 2的驱动模块 1 , 驱动模块 1通过驱动线 6连接到灯条 2, 驱动 线 6和液晶显示装置的驱动电路的接地端 GND之间依次串联有放电模块 3和开 关模块 4;还连接有电解电容 C; 液晶显示装置输出启动信号耦合到开关模块 4。
放电模块 3 包括多个并联设置的放电电阻(如图中 R1 ~ R4 ), 放电电阻为 100ΚΩ , 放电电阻的一端连接控制线驱动线 6, 另一端和开关模块 4耦合。 放 电模块 3选用电阻, 成本低廉, 且可以通过并联方式提升放电功率, 方便拓展。
开关模块 4 包括串联在放电模块 3 和液晶显示装置的驱动电路的接地端 GND之间的第一可控开关 Q1、与第一可控开关 Q1控制端耦合的监控单元 5; 监 控单元 5包括与液晶显示装置的驱动电路的接地端 GND耦合的分压电阻 R5、 与分压电阻 R5耦合的第二可控开关 Q2、 与第二可控开关 Q2耦合的基准电压; 第二可控开关 Q2的控制端通过一逻辑取反器 7耦合到启动信号;
液晶显示装置输出的关机信号为低电平信号; 其输出的开机信号为高电平 信号; 第一可控开关 Q1和第二可控开关 Q2由高电平信号驱动导通。
此为第三种开关模块 4的具体电路形式,第一可控开关 Q1在液晶显示装置 关机时导通, 电容可以通过放电模块 3放电; 当液晶显示装置开机后, 第一可 控开关 Q1关断, 切断放电模块 3的放电回路, 放电模块 3不工作, 不会产生额 外的能耗。 本实施例中, 第一和第二可控开关(Q1 和 Q2 )都是高电平导通, 这样就可以选用同一型号的可控开关器件(如 MOS管), 提高器件的通用率, 另外, 如果两个可控开关的动作逻辑相反, 在生产过程中存在接错的风险; 选 用相同动作逻辑的可控开关则可以有效避免人为失误, 方便生产, 同时提高了 产品良率。
实施例四
参见图 2和图 6, 本发明还公开了一种液晶显示装置驱动电路的驱动方法, 包括步骤:
A、 在驱动线 6和液晶显示装置的驱动电路的接地端 GND之间依次串联放 电模块 3和开关模块 4;
B、 在液晶显示装置的驱动电路关机时, 控制开关模块 4导通; 在液晶显示 装置的驱动电路开机时, 控制开关模块 4关断。
步骤 A中, 开关模块 4包括串联在放电模块 3和液晶显示装置的驱动电路 的接地端 GND之间的第一可控开关 Q1、与第一可控开关 Q1控制端耦合的监控 单元 5;
步骤 B包括: 在液晶显示装置的驱动电路关机时, 监控单元 5驱动第一可 控开关 Q1导通; 在液晶显示装置的驱动电路开机时,监控单元 5驱动第一可控 开关 Q1关断。 此为一种利用可控开关控制放电模块 3放电的电路, 第一可控开 关 Q1在液晶显示装置关机时导通, 电容可以通过放电模块 3放电; 当液晶显示 装置开机后, 第一可控开关 Q1关断, 切断放电模块 3的放电回路, 放电模块 3 不工作, 不会产生额外的能耗。
以上内容是结合具体的优选实施方式对本发明所作的进一步详细说明, 不 能认定本发明的具体实施只局限于这些说明。 对于本发明所属技术领域的普通 技术人员来说, 在不脱离本发明构思的前提下, 还可以做出若干筒单推演或替 换, 都应当视为属于本发明的保护范围。

Claims

权利要求
1、 一种液晶显示装置的驱动电路, 包括驱动所述液晶显示装置的灯条的驱 动线, 所述驱动线和所述液晶显示装置的驱动电路的接地端之间依次串联有放 电模块和开关模块; 所述液晶显示装置输出启动信号耦合到所述开关模块; 所述启动信号为关机信号时, 所述开关模块导通; 所述启动信号为开机信 号时, 所述开关模块关断。
2、 如权利要求 1所述的一种液晶显示装置的驱动电路, 其中, 所述开关模 块包括串联在所述放电模块和所述液晶显示装置的驱动电路的接地端之间的第 一可控开关、 与所述第一可控开关控制端耦合的监控单元;
所述监控单元在所述液晶显示装置输出关机信号时驱动所述第一可控开关 导通, 在所述液晶显示装置输出开机信号时驱动所述第一可控开关关断。
3、 如权利要求 2所述的一种液晶显示装置的驱动电路, 其中, 所述监控单 元包括与液晶显示装置的驱动电路的接地端耦合的第二可控开关、 与第二可控 开关耦合的分压电阻、 与分压电阻耦合的基准电压; 所述第二可控开关的控制 端耦合到所述启动信号;
所述液晶显示装置输出的关机信号为低电平信号; 其输出的开机信号为高 电平信号; 所述第一可控开关和第二可控开关由低电平信号驱动导通。
4、 如权利要求 2所述的一种液晶显示装置的驱动电路, 其中, 所述监控单 元包括与液晶显示装置的驱动电路的接地端耦合的分压电阻、 与分压电阻耦合 的第二可控开关、 与第二可控开关耦合的基准电压; 所述第二可控开关的控制 端耦合到所述启动信号;
所述液晶显示装置输出的关机信号为低电平信号; 其输出的开机信号为高 电平信号; 所述第一可控开关由低电平信号驱动导通, 所述第二可控开关由高 电平信号驱动导通。
5、 如权利要求 2所述的一种液晶显示装置的驱动电路, 其中, 所述监控单 元包括与液晶显示装置的驱动电路的接地端耦合的分压电阻、 与分压电阻耦合 的第二可控开关、 与第二可控开关耦合的基准电压; 所述第二可控开关的控制 端通过一逻辑取反器耦合到所述启动信号;
所述液晶显示装置输出的关机信号为低电平信号; 其输出的开机信号为高 电平信号; 所述第一可控开关和第二可控开关由高电平信号驱动导通。
6、 如权利要求 1所述的一种液晶显示装置的驱动电路, 其中, 所述放电模 块包括多个并联设置的放电电阻, 所述放电电阻的一端连接所述驱动线, 另一 端和所述开关模块耦合。
7、 如权利要求 6所述的一种液晶显示装置的驱动电路, 其中, 所述放电电 阻为 100ΚΩ。
8、 一种液晶显示装置驱动电路的驱动方法, 包括步骤:
A、在驱动线和液晶显示装置的驱动电路的接地端之间依次串联放电模块和 开关模块;
B、 在液晶显示装置的驱动电路关机时, 控制开关模块导通; 在液晶显示装 置的驱动电路开机时, 控制开关模块关断。
9、 如权利要求 8所述的一种液晶显示装置驱动电路的驱动方法, 其中, 所 述步骤 A中, 所述开关模块包括串联在所述放电模块和所述液晶显示装置的驱 动电路的接地端之间的第一可控开关、 与所述第一可控开关控制端耦合的监控 单元;
所述步骤 B 包括: 在液晶显示装置的驱动电路关机时, 监控单元驱动第一 可控开关导通; 在液晶显示装置的驱动电路开机时, 监控单元驱动第一可控开 关关断。
10、 一种液晶显示装置, 包括一种液晶显示装置的驱动电路, 所述液晶显 示装置的驱动电路包括驱动所述液晶显示装置的灯条的驱动线, 所述驱动线和 所述液晶显示装置的驱动电路的接地端之间依次串联有放电模块和开关模块; 所述液晶显示装置输出启动信号耦合到所述开关模块; 所述启动信号为关机信号时, 所述开关模块导通; 所述启动信号为开机信 号时, 所述开关模块关断。
11、 如权利要求 10所述的一种液晶显示装置, 其中, 所述开关模块包括串 联在所述放电模块和所述液晶显示装置的驱动电路的接地端之间的第一可控开 关、 与所述第一可控开关控制端耦合的监控单元;
所述监控单元在所述液晶显示装置输出关机信号时驱动所述第一可控开关 导通, 在所述液晶显示装置输出开机信号时驱动所述第一可控开关关断。
12、 如权利要求 11所述的一种液晶显示装置, 其中, 所述监控单元包括与 液晶显示装置的驱动电路的接地端耦合的第二可控开关、 与第二可控开关耦合 的分压电阻、 与分压电阻耦合的基准电压; 所述第二可控开关的控制端耦合到 所述启动信号;
所述液晶显示装置输出的关机信号为低电平信号; 其输出的开机信号为高 电平信号; 所述第一可控开关和第二可控开关由低电平信号驱动导通。
13、 如权利要求 11所述的一种液晶显示装置, 其中, 所述监控单元包括与 液晶显示装置的驱动电路的接地端耦合的分压电阻、 与分压电阻耦合的第二可 控开关、 与第二可控开关耦合的基准电压; 所述第二可控开关的控制端耦合到 所述启动信号;
所述液晶显示装置输出的关机信号为低电平信号; 其输出的开机信号为高 电平信号; 所述第一可控开关由低电平信号驱动导通, 所述第二可控开关由高 电平信号驱动导通。
14、 如权利要求 11所述的一种液晶显示装置, 其中, 所述监控单元包括与 液晶显示装置的驱动电路的接地端耦合的分压电阻、 与分压电阻耦合的第二可 控开关、 与第二可控开关耦合的基准电压; 所述第二可控开关的控制端通过一 逻辑取反器耦合到所述启动信号;
所述液晶显示装置输出的关机信号为低电平信号; 其输出的开机信号为高 电平信号; 所述第一可控开关和第二可控开关由高电平信号驱动导通。
15、 如权利要求 10所述的一种液晶显示装置, 其中, 所述放电模块包括多 个并联设置的放电电阻, 所述放电电阻的一端连接所述驱动线, 另一端和所述 开关模块耦合。
16、如权利要求 15所述的一种液晶显示装置, 其中, 所述放电电阻为 100K
Ω。
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