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CN101527988B - Light source driver module and circuit - Google Patents

Light source driver module and circuit Download PDF

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Publication number
CN101527988B
CN101527988B CN200810082121XA CN200810082121A CN101527988B CN 101527988 B CN101527988 B CN 101527988B CN 200810082121X A CN200810082121X A CN 200810082121XA CN 200810082121 A CN200810082121 A CN 200810082121A CN 101527988 B CN101527988 B CN 101527988B
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electrically connected
voltage
operational amplifier
light source
input end
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CN101527988A (en
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陈建仰
林琦修
林信彰
谢博坤
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Chunghwa Picture Tubes Ltd
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Chunghwa Picture Tubes Ltd
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Abstract

The light source driving circuit comprises a voltage signal source and a current source for improving the temperature effect and is used for adjusting the brightness of a light emitting diode string. The first end of the LED string is electrically connected to a ground terminal. The current source for improving the temperature effect comprises an adjustable bias source for outputting an adjustable voltage; a voltage-controlled current source for outputting current according to the voltage signal source; and the feedback circuit is electrically connected between the second end of the light-emitting diode serial and the adjustable bias voltage source and used for controlling the voltage output by the adjustable bias voltage source according to the voltage on the second end of the light-emitting diode serial.

Description

光源驱动模块及电路Light source driver module and circuit

技术领域technical field

本发明涉及一种光源驱动电路及模块，特别涉及一种提供定电流与改善温度效应的光源驱动电路及模块。The invention relates to a light source driving circuit and module, in particular to a light source driving circuit and module which provide constant current and improve temperature effect.

背景技术Background technique

以发光二极管(Light Emitting Diode，LED)作为发光源的应用越来越普遍。例如，传统液晶显示面板的背光模块多半是以冷阴极荧光灯管(coldcathode fluorescent lamp，CCFL)来作为光源。如今，随着发光二极管的发光效率不断提升且成本日益降低，发光二极管逐渐取代冷阴极荧光灯管来做为背光模块光源。The application of light emitting diode (Light Emitting Diode, LED) as light source is more and more common. For example, most of the backlight modules of traditional liquid crystal display panels use cold cathode fluorescent lamps (coldcathode fluorescent lamp, CCFL) as light sources. Nowadays, as the luminous efficiency of light-emitting diodes continues to increase and the cost decreases, light-emitting diodes gradually replace cold cathode fluorescent tubes as light sources for backlight modules.

在现有技术中，常会将多颗发光二极管串联成一串列，以减少所需的驱动电路数量及降低发光二极管的总驱动电流大小。然而，由于工艺上的偏差，很难确保不同串列中的所有发光二极管都有完全一致的元件参数。此外，温度等环境因素也可能会影响到发光二极管的元件参数。举例而言，不同发光二极管的顺向电压(forward voltage，VF)经常会有些许的差异。而当温度上升时，发光二极管的页向偏压亦会跟着下降，而使得流经发光二极管的电流将随温度改变。因此即使以串联的方式来驱动发光二极管，仍会因为温度的上升，而改变原本发光二极管的亮度。所以，将多颗发光二极管串联成一串列的架构会等效地将同一串列中所有发光二极管的顺向电压误差累加起来，而不同发光二极管串列所累加的总顺向电压误差通常也会有所不同。In the prior art, a plurality of light emitting diodes are often connected in series to reduce the number of required driving circuits and reduce the total driving current of the light emitting diodes. However, due to process variations, it is difficult to ensure that all LEDs in different strings have completely consistent device parameters. In addition, environmental factors such as temperature may also affect the component parameters of light emitting diodes. For example, the forward voltage (VF) of different LEDs often has slight differences. When the temperature rises, the bias voltage of the light emitting diode will also decrease, so that the current flowing through the light emitting diode will change with the temperature. Therefore, even if the light emitting diodes are driven in series, the original brightness of the light emitting diodes will still be changed due to temperature rise. Therefore, the structure of connecting multiple LEDs in series will equivalently add up the forward voltage error of all LEDs in the same string, and the total forward voltage error accumulated by different LED strings will usually be the same. different.

在此情况下，即使将相同的驱动电压施加予不同的发光二极管串列，流经个别发光二极管串列的电流也会因每一发光二极管串列所累加的总顺向电压误差不同而有所不同。而当各发光二极管串列上升的温度不相同时，总页向电压误差的变化将更大。如此一来，发光二极管串列彼此间将因导通电流不一致而有不同的亮度。因此，利用发光二极管串列作为液晶显示面板的背光模块的光源时，常会导致液晶显示面板因背光源亮度不均匀而有色不均(Mura)的不良现象。In this case, even if the same driving voltage is applied to different LED strings, the current flowing through individual LED strings will vary due to the difference in the total forward voltage error accumulated by each LED string. different. And when the rising temperature of each light emitting diode series is different, the change of the total page voltage error will be even greater. In this way, the light emitting diode series will have different brightness due to the inconsistency of conduction current. Therefore, when the LED series is used as the light source of the backlight module of the liquid crystal display panel, the liquid crystal display panel will often cause the undesirable phenomenon of color unevenness (Mura) due to uneven brightness of the backlight.

发明内容Contents of the invention

因此本发明的目的之一在于提供定电流与改善温度效应的光源驱动电路及模块，以解决上述问题。Therefore, one of the objectives of the present invention is to provide a light source driving circuit and module with constant current and improved temperature effect, so as to solve the above problems.

本发明提供一种光源驱动电路，光源驱动电路用于驱动一发光二极管串列。发光二极管串列的第一端电性连接于一接地端。驱动电路包含一电压信号源；一电压控制的电流源，包含一第一运算放大器，包含一正输入端，电性连接于电压信号源，一负输入端，及一输出端；一第一双载子接面晶体管，包含一射极，电性连接于第一运算放大器的负输入端，一基极，电性连接于第一运算放大器的输出端，及一集电极；一第一电阻，电性连接于第一运算放大器的负输入端与接地端之间；一第二运算放大器，包含一正输入端，电性连接第一双载子接面晶体管的集电极，一负输入端，及一输出端；一第二电阻，电性连接于第一双载子接面晶体管的集电极与一偏压源之间；一第三电阻，电性连接于第二运算放大器的负输入端与偏压源之间；及一第二双载子接面晶体管，包含一射极，电性连接于第二运算放大器的负输入端，一基极，电性连接于第二运算放大器的输出端，及一集电极，电性连接于发光二极管串列的第二端。The invention provides a light source driving circuit, which is used to drive a series of light emitting diodes. The first end of the LED series is electrically connected to a ground end. The drive circuit includes a voltage signal source; a voltage-controlled current source, including a first operational amplifier, including a positive input terminal, electrically connected to the voltage signal source, a negative input terminal, and an output terminal; a first dual The carrier junction transistor includes an emitter electrically connected to the negative input terminal of the first operational amplifier, a base electrically connected to the output terminal of the first operational amplifier, and a collector; a first resistor, Electrically connected between the negative input terminal of the first operational amplifier and the ground terminal; a second operational amplifier, including a positive input terminal, electrically connected to the collector of the first BJT, and a negative input terminal, and an output terminal; a second resistor, electrically connected between the collector of the first bicarrier junction transistor and a bias source; a third resistor, electrically connected to the negative input terminal of the second operational amplifier and a bias source; and a second bicarrier junction transistor, including an emitter, electrically connected to the negative input terminal of the second operational amplifier, and a base, electrically connected to the output of the second operational amplifier terminal, and a collector, electrically connected to the second terminal of the LED series.

本发明更提供一种光源驱动模块，光源驱动模块用于驱动一发光二极管阵列。发光二极管阵列包含K个发光二极管串列。其中，K为正整数。每个发光二极管串列的第一端电性连接于一接地端。驱动模块包含一电压信号源；K个电压控制的电流源，每个电压控制的电流源包含一第一运算放大器，包含一正输入端，电性连接于电压信号源，一负输入端，及一输出端；一第一双载子接面晶体管，包含一射极，电性连接于第一运算放大器的负输入端，一基极，电性连接于第一运算放大器的输出端，及一集电极；一第一电阻，电性连接于第一运算放大器的负输入端与接地端之间；一第二运算放大器，包含一正输入端，电性连接第一双载子接面晶体管的集电极，一负输入端，及一输出端；一第二电阻，电性连接于第一双载子接面晶体管的集电极与一偏压源之间；一第三电阻，电性连接于第二运算放大器的负输入端与偏压源之间；及一第二双载子接面晶体管，包含一射极，电性连接于第二运算放大器的负输入端，一基极，电性连接于第二运算放大器的输出端，及一集电极，电性连接于对应的一发光二极管串列的第二端。The invention further provides a light source driving module, which is used to drive a light emitting diode array. The LED array includes K LED strings. Among them, K is a positive integer. The first end of each LED series is electrically connected to a ground end. The drive module includes a voltage signal source; K voltage-controlled current sources, each voltage-controlled current source includes a first operational amplifier, including a positive input terminal, electrically connected to the voltage signal source, a negative input terminal, and An output terminal; a first bicarrier junction transistor, including an emitter, electrically connected to the negative input terminal of the first operational amplifier, a base, electrically connected to the output terminal of the first operational amplifier, and a Collector; a first resistor, electrically connected between the negative input terminal of the first operational amplifier and the ground terminal; a second operational amplifier, including a positive input terminal, electrically connected to the first BJT collector, a negative input terminal, and an output terminal; a second resistor, electrically connected between the collector of the first BJT and a bias source; a third resistor, electrically connected to Between the negative input terminal of the second operational amplifier and the bias source; and a second bicarrier junction transistor, including an emitter, electrically connected to the negative input terminal of the second operational amplifier, and a base, electrically It is connected to the output end of the second operational amplifier, and a collector is electrically connected to the second end of a corresponding LED string.

本发明还提供一种光源驱动电路，光源驱动电路用于驱动一发光二极管串列。发光二极管串列的第一端电性连接于一接地端。驱动电路包含一电压信号源；一电流源，包含一可调偏压源，用以输出一可调大小的电压；一电压控制的电流源，包含一第一运算放大器，包含一正输入端，电性连接于电压信号源，一负输入端，及一输出端；一第一双载子接面晶体管，包含一射极，电性连接于第一运算放大器的负输入端，一基极，电性连接于第一运算放大器的输出端，及一集电极；一第一电阻，电性连接于第一运算放大器的负输入端与接地端之间；一第二运算放大器，包含一正输入端，电性连接第一双载子接面晶体管的集电极，一负输入端，及一输出端；一第二电阻，电性连接于第一双载子接面晶体管的集电极与可调偏压源之间；一第三电阻，电性连接于第二运算放大器的负输入端与可调偏压源之间；一第二双载子接面晶体管，包含一射极，电性连接于第二运算放大器的负输入端，一基极，电性连接于第二运算放大器的输出端，及一集电极，电性连接于发光二极管串列的第二端；及一反馈电路，电性连接于发光二极管串列的第二端与可调偏压源之间，用以根据发光二极管串列的第二端上的电压，控制可调偏压源所输出的电压大小。The invention also provides a light source driving circuit, which is used to drive a series of light emitting diodes. The first end of the LED series is electrically connected to a ground end. The drive circuit includes a voltage signal source; a current source includes an adjustable bias source for outputting an adjustable voltage; a voltage-controlled current source includes a first operational amplifier and includes a positive input terminal, Electrically connected to a voltage signal source, a negative input terminal, and an output terminal; a first bicarrier junction transistor, including an emitter, electrically connected to the negative input terminal of the first operational amplifier, and a base, Electrically connected to the output terminal of the first operational amplifier and a collector; a first resistor electrically connected between the negative input terminal of the first operational amplifier and the ground terminal; a second operational amplifier including a positive input terminal, electrically connected to the collector of the first bipolar junction transistor, a negative input terminal, and an output terminal; a second resistor, electrically connected to the collector of the first bipolar junction transistor and the adjustable Between the bias voltage sources; a third resistor, electrically connected between the negative input terminal of the second operational amplifier and the adjustable bias voltage source; a second bicarrier junction transistor, including an emitter, electrically connected At the negative input end of the second operational amplifier, a base is electrically connected to the output end of the second operational amplifier, and a collector is electrically connected to the second end of the LED series; and a feedback circuit is electrically connected The LED is connected between the second end of the LED series and the adjustable bias source, and is used for controlling the output voltage of the adjustable bias source according to the voltage on the second end of the LED series.

本发明更提供一种光源驱动模块，光源驱动模块用于驱动一发光二极管阵列。发光二极管阵列包含K个发光二极管串列。其中，K为正整数。每个发光二极管串列的第一端电性连接于一接地端。驱动模块包含一电压信号源；K个电流源，每个电流源包含一可调偏压源，用以输出一可调大小的电压；一电压控制电流源，包含一第一运算放大器，包含一正输入端，电性连接于电压信号源，一负输入端，及一输出端；一第一双载子接面晶体管，包含一射极，电性连接于第一运算放大器的负输入端，一基极，电性连接于第一运算放大器的输出端，及一集电极；一第一电阻，电性连接于第一运算放大器的负输入端与接地端之间；一第二运算放大器，包含一正输入端，电性连接第一双载子接面晶体管的集电极，一负输入端，及一输出端；一第二电阻，电性连接于第一双载子接面晶体管的集电极与可调偏压源之间；一第三电阻，电性连接于第二运算放大器的负输入端与可调偏压源之间；一第二双载子接面晶体管，包含一射极，电性连接于第二运算放大器的负输入端，一基极，电性连接于第二运算放大器的输出端，及一集电极，电性连接于对应的一发光二极管串列的第二端；及一反馈电路，电性连接于对应的发光二极管串列的第二端与可调偏压源之间，用以根据对应的发光二极管串列的第二端上的电压，控制可调偏压源所输出的电压大小。The invention further provides a light source driving module, which is used to drive a light emitting diode array. The LED array includes K LED strings. Among them, K is a positive integer. The first end of each LED series is electrically connected to a ground end. The drive module includes a voltage signal source; K current sources, each of which includes an adjustable bias voltage source for outputting an adjustable voltage; a voltage-controlled current source includes a first operational amplifier, including a a positive input terminal, electrically connected to a voltage signal source, a negative input terminal, and an output terminal; a first bipolar junction transistor, including an emitter, electrically connected to the negative input terminal of the first operational amplifier, a base, electrically connected to the output terminal of the first operational amplifier, and a collector; a first resistor, electrically connected between the negative input terminal of the first operational amplifier and the ground terminal; a second operational amplifier, Including a positive input terminal, electrically connected to the collector of the first bipolar junction transistor, a negative input terminal, and an output terminal; a second resistor, electrically connected to the collector of the first bipolar junction transistor between the electrode and the adjustable bias source; a third resistor electrically connected between the negative input terminal of the second operational amplifier and the adjustable bias source; a second bicarrier junction transistor including an emitter , electrically connected to the negative input end of the second operational amplifier, a base electrically connected to the output end of the second operational amplifier, and a collector electrically connected to the second end of a corresponding LED series and a feedback circuit, electrically connected between the second end of the corresponding light emitting diode string and the adjustable bias source, for controlling the adjustable bias according to the voltage on the second end of the corresponding light emitting diode string The voltage output by the voltage source.

附图说明Description of drawings

图1是根据本发明第一实施例的光源驱动电路的示意图。FIG. 1 is a schematic diagram of a light source driving circuit according to a first embodiment of the present invention.

图2是本发明第一实施例的电压信号源的示意图。FIG. 2 is a schematic diagram of a voltage signal source according to the first embodiment of the present invention.

图3是本发明第二实施例的电压信号源的示意图。FIG. 3 is a schematic diagram of a voltage signal source according to a second embodiment of the present invention.

图4是根据本发明第一实施例的光源驱动模块的示意图。Fig. 4 is a schematic diagram of a light source driving module according to a first embodiment of the present invention.

图5是根据本发明第二实施例的光源驱动电路的示意图。FIG. 5 is a schematic diagram of a light source driving circuit according to a second embodiment of the present invention.

图6是根据本发明第二实施例的光源驱动模块的示意图。Fig. 6 is a schematic diagram of a light source driving module according to a second embodiment of the present invention.

附图符号说明Description of reference symbols

Amp1、Amp2                 运算放大器Amp 1 , Amp 2 operational amplifiers

IR1、IR2、IX、IL           电流I R1 , I R2 , I X , I L current

M                          发光二极管阵列M LED array

X                          发光二极管串列X LED series

Q1、Q2                     晶体管Q 1 , Q 2 transistors

R1、R2、RX                 电阻R 1 , R 2 , R X resistance

T                          周期T period

Ta、Tb、Tc                 导通时间Ta, Tb, Tc Turn-on time

VCC、VR2、VR1、VQ1、VQ2、  电压V CC , VR2 , VR1 , V Q1 , V Q2 , voltage

VRX、V1(+)、V1(-)、V2(+)、V RX , V 1 (+), V 1 (-), V 2 (+),

V2(-)、VLED、VX、VREF、V1、V 2 (-), V LED , V X , V REF , V 1 ,

V2、VIN V 2 、V IN

100、500                   驱动电路100, 500 Drive circuit

110                        电压控制电流源110 Voltage controlled current source

120                        电压信号源120 Voltage signal source

400、600                   驱动模块400, 600 Driver Module

510                        反馈电路510 Feedback circuit

520                        补偿电路520 Compensation circuit

530                        直流/直流转换器530 DC/DC Converter

540                        改善温度效应的电流源。540 Current source to improve temperature effect.

具体实施方式Detailed ways

在说明书及后续的申请专利范围当中使用了某些词汇来指称特定的元件。所属领域中具有通常知识者应可理解，制造商可能会用不同的名词来称呼同样的元件。本说明书及后续的申请专利范围并不以名称的差异来作为区别元件的方式，而是以元件在功能上的差异来作为区别的基准。在通篇说明书及后续的权利要求当中所提及的「包含」是一开放式的用语，故应解释成「包含但不限定于」。此外，「电性连接」一词在此是包含任何直接及间接的电气连接手段。因此，若文中描述一第一装置电性连接于一第二装置，则代表该第一装置可直接连接于该第二装置，或通过其它装置或连接手段间接地连接至该第二装置。Certain terms are used in the specification and subsequent claims to refer to particular elements. It should be understood by those skilled in the art that manufacturers may refer to the same element by different terms. This description and subsequent patent applications do not use the difference in name as the way to distinguish components, but the difference in function of the components as the basis for distinction. "Includes" mentioned throughout the specification and subsequent claims is an open-ended term, so it should be interpreted as "including but not limited to". In addition, the term "electrical connection" here includes any direct and indirect electrical connection means. Therefore, if it is described that a first device is electrically connected to a second device, it means that the first device may be directly connected to the second device, or indirectly connected to the second device through other devices or connection means.

请参考图1。图1是根据本发明的光源驱动电路的一第一实施例的光源驱动电路100的示意图。如图所示，驱动电路100包含一电压控制电流源110与电压信号源120。电压信号源120用以提供一电压VIN以控制电压控制电流源110，而产生电流IL以驱动负载的二极管串列X(多个二极管串联)。且电流IL与二极管串列X负载的大小并无关系，而仅与电压VIN有关。因此，本发明的光源驱动电路100便可根据电压信号源120所产生的电压VIN，来控制电流IL的大小，进而控制二极管串列X的亮度。Please refer to Figure 1. FIG. 1 is a schematic diagram of a light source driving circuit 100 according to a first embodiment of the light source driving circuit of the present invention. As shown in the figure, the driving circuit 100 includes a voltage-controlled current source 110 and a voltage signal source 120 . The voltage signal source 120 is used to provide a voltage V IN to control the voltage-controlled current source 110 to generate a current IL to drive the load diode series X (multiple diodes in series). And the current I L has nothing to do with the size of the load of the diode series X, but only with the voltage V IN . Therefore, the light source driving circuit 100 of the present invention can control the magnitude of the current I L according to the voltage V IN generated by the voltage signal source 120 , and further control the brightness of the diode string X.

请继续参考图1。电压控制电流源110包含二运算放大器Amp1与Amp2、二双载子接面晶体管(Bipolar Junction Transistor，BJT)Q1与Q2、三电阻R1、R2与RX。运算放大器Amp1包含一正输入端，电性连接于电压信号源120、一负输入端，电性连接于晶体管Q1的射极，及一输出端，电性连接于晶体管Q1的基极；电阻R1一端电性连接于晶体管Q1的射极，另一端电性连接于一接地端；电阻R2一端电性连接于晶体管Q1的集电极，另一端电性连接于偏压源VCC；运算放大器Amp2包含一正输入端，电性连接于晶体管Q1的集电极、一负输入端，电性连接于晶体管Q2的射极，以及一输出端，电性连接于晶体管的基极；电阻RX一端电性连接于晶体管Q2的射极，另一端电性连接于偏压源VCC；而晶体管Q2的集电极电性连接于二极管串列X，用以提供电流IL给二极管串列X。Please continue to refer to Figure 1. The voltage-controlled current source 110 includes two operational amplifiers Amp 1 and Amp 2 , two bipolar junction transistors (Bipolar Junction Transistor, BJT) Q 1 and Q 2 , and three resistors R 1 , R 2 and R X . The operational amplifier Amp 1 includes a positive input terminal electrically connected to the voltage signal source 120, a negative input terminal electrically connected to the emitter of the transistor Q1 , and an output terminal electrically connected to the base of the transistor Q1 ; One end of the resistor R1 is electrically connected to the emitter of the transistor Q1 , and the other end is electrically connected to a ground terminal; one end of the resistor R2 is electrically connected to the collector of the transistor Q1 , and the other end is electrically connected to the bias voltage source V CC ; the operational amplifier Amp 2 includes a positive input terminal electrically connected to the collector of the transistor Q1 , a negative input terminal electrically connected to the emitter of the transistor Q2 , and an output terminal electrically connected to the transistor Q1 the base of the resistor R X; one end of the resistor R X is electrically connected to the emitter of the transistor Q2 , and the other end is electrically connected to the bias voltage source V CC ; and the collector of the transistor Q2 is electrically connected to the diode series X to provide current IL for diode string X.

驱动电路100的运作原理如下：由于运算放大器Amp1、Amp2的正负输入端为虚短路，因此运算放大器Amp1的正、负输入端电压相等[V1(+)＝V1(-)]、运算放大器Amp2的正、负输入端电压相等[V2(+)＝V2(-)]，又运算放大器Amp1的正输入端电性连接于电压信号源120，而其上的电位即为电压VIN。因此电阻R1的跨压等于电压VIN(VR1＝VIN)；电阻RX与R2的跨压亦相等(VRX＝VR2)。另外由于运算放大器Amp1、Amp2的输入阻抗视为无限大，所以运算放大器Amp1、Amp2的输入电流视为零。因此晶体管Q1的射极电流可视为流经电阻R1的电流IR1，又知电阻R1的跨压VR1等于VIN，因此晶体管Q1的射极电流便为VIN/R1。而由于晶体管Q1的基极电流非常小，因此假设晶体管Q1的射极电流等于晶体管Q1的集电极电流，所以流经电阻R2的电流即为VIN/R1。而由于电阻R2与RX一端共同电性连接到偏压源VCC，另一端则分别电性连接到运算放大器Amp2的正、负输入端[V2(+)＝V2(-)]，因此电阻R2与RX的跨压相同。经由上述可算出流经电阻RX的电流IX为R2×(VIN/R1)/RX，再设定电阻R1与R2的阻值相同，则IX即为VIN/RX。而晶体管Q2的射极电流即等于电流IX(运算放大器Amp2的输入阻抗无限大)，且晶体管的基极电流非常小，因此晶体管Q2的射极电流IX即等于晶体管Q2的集电极电流IL(二极管串列X的负载电流)。因此，根据上述，二极管串列X的负载电流IL＝VIN/RX。也就是说，二极管串列X的负载电流与其本身的负载大小无关，仅与输入电压VIN与电阻RX有关。而当电阻RX为定值时，负载电流IL大小仅与输入电压VIN有关，控制方便。因此，根据本发明的驱动电路100，可利用电压VIN，来控制电流IL的大小，进而控制二极管串列X的亮度。The operating principle of the driving circuit 100 is as follows: since the positive and negative input terminals of the operational amplifiers Amp 1 and Amp 2 are virtual short circuits, the voltages of the positive and negative input terminals of the operational amplifier Amp 1 are equal [V 1 (+)=V 1 (-) ], the voltages of the positive and negative input terminals of the operational amplifier Amp 2 are equal [V 2 (+)=V 2 (-)], and the positive input terminal of the operational amplifier Amp 1 is electrically connected to the voltage signal source 120, and the above The potential is the voltage V IN . Therefore, the voltage across the resistor R 1 is equal to the voltage V IN (V R1 =V IN ); the voltage across the resistors R X and R 2 is also equal (V RX =V R2 ). In addition, since the input impedances of the operational amplifiers Amp 1 and Amp 2 are regarded as infinite, the input currents of the operational amplifiers Amp 1 and Amp 2 are regarded as zero. Therefore, the emitter current of transistor Q 1 can be regarded as the current I R1 flowing through resistor R 1 , and the cross-voltage V R1 of resistor R 1 is equal to V IN , so the emitter current of transistor Q 1 is V IN /R 1 . Since the base current of the transistor Q 1 is very small, it is assumed that the emitter current of the transistor Q 1 is equal to the collector current of the transistor Q 1 , so the current flowing through the resistor R 2 is V IN /R 1 . Since one end of the resistor R 2 and R X is electrically connected to the bias voltage source V CC , the other end is respectively electrically connected to the positive and negative input terminals of the operational amplifier Amp 2 [V 2 (+)=V 2 (-) ], so resistor R2 has the same voltage across RX . Through the above, the current I X flowing through the resistor R X can be calculated as R 2 ×(V IN /R 1 )/R X , and then the resistance values of the resistors R 1 and R 2 are set to be the same, then I X is V IN / R X . And the emitter current of the transistor Q2 is equal to the current IX (the input impedance of the operational amplifier Amp2 is infinite), and the base current of the transistor is very small, so the emitter current IX of the transistor Q2 is equal to the current IX of the transistor Q2 Collector current IL (load current of diode string X). Therefore, according to the above, the load current I L of the diode string X = V IN /R X . That is to say, the load current of the diode series X has nothing to do with its own load, but is only related to the input voltage V IN and the resistance R X . And when the resistance R X is a fixed value, the magnitude of the load current I L is only related to the input voltage V IN , which is convenient to control. Therefore, according to the driving circuit 100 of the present invention, the voltage V IN can be used to control the magnitude of the current IL , and further control the brightness of the diode string X.

请参考图2。图2是本发明第一实施例的电压信号源120的电压VIN的示意图。如图所示，电压信号源120上所载的电压VIN，可为一可调整责任比(dutyratio)的脉冲宽度调制(Pulse Width Modulation，PWM)的电压信号，其周期为T，而于导通时电压为VX，关闭时电压为零。其导通的时间可为Ta、Tb或Tc，端看使用者设计，当欲使二极管串列X的亮度越高，则可把导通的时间调高(如Ta)；反之，当欲使二极管串列X的亮度越低，则可把导通的时间调低(如Tc)。只要电压信号的周期T低于1/16秒，人眼便看不出发光二极管串列X有闪烁的情况。如此便能有效控制二极管串列X的亮度。Please refer to Figure 2. FIG. 2 is a schematic diagram of the voltage V IN of the voltage signal source 120 according to the first embodiment of the present invention. As shown in the figure, the voltage V IN carried by the voltage signal source 120 can be a pulse width modulation (Pulse Width Modulation, PWM) voltage signal with an adjustable duty ratio. The voltage is V X when it is on, and it is zero when it is off. Its turn-on time can be Ta, Tb or Tc, depending on the user's design. When you want to make the brightness of the diode series X higher, you can increase the turn-on time (such as Ta); otherwise, when you want to make The lower the brightness of the diode series X, the lower the conduction time (eg Tc). As long as the period T of the voltage signal is lower than 1/16 second, human eyes cannot see the flickering of the LED series X. In this way, the brightness of the diode string X can be effectively controlled.

请参考图3。图3是本发明第二实施例的电压信号源120的电压VIN的示意图。如图所示，电压信号源120上所载的电压VIN，亦可直接调整其大小，来控制二极管串列X的亮度。当欲使二极管串列X的亮度越高，则可将电压VIN调高；反之，当欲使二极管串列X的亮度越低，则可将电压VIN调低。如此便能有效控制二极管串列X的亮度。Please refer to Figure 3. FIG. 3 is a schematic diagram of the voltage V IN of the voltage signal source 120 according to the second embodiment of the present invention. As shown in the figure, the voltage V IN carried by the voltage signal source 120 can also be directly adjusted to control the brightness of the diode string X. When the brightness of the diode series X is desired to be higher, the voltage V IN can be adjusted higher; otherwise, when the brightness of the diode series X is desired to be lower, the voltage V IN can be adjusted lower. In this way, the brightness of the diode string X can be effectively controlled.

另外，电压信号源120的电压VIN亦可结合图2与图3的方式，意即于图2中，除调整责任比外，亦可调整电压VX的大小(用以微调)，同样能有效控制二极管串列的亮度。In addition, the voltage V IN of the voltage signal source 120 can also be combined with the methods shown in FIG. 2 and FIG. 3 , which means that in FIG. Effectively control the brightness of the diode string.

请参考图4。图4是根据本发明第一实施例的光源驱动模块400的示意图。如图所示，驱动模块400包含一电压信号源120与多个电压控制电流源110，用以驱动二极管阵列M(包含多个二极管串列)。电压信号源120电性连接于每个电压控制电流源110的运算放大器Amp1的正输入端(如同图1所述)、而每个电压控制电流源110的晶体管Q2的集电极电性连接于对应的二极管串列X(如同图1所述)。电压信号源120用以输出电压VIN以控制每个电压控制电流源110所输出的电流，如此一来，每个电压控制电流源110都会彼此相同，而使整个二极管阵列M能够具有同等的亮度，不会产生亮度不均的问题。Please refer to Figure 4. Fig. 4 is a schematic diagram of a light source driving module 400 according to the first embodiment of the present invention. As shown in the figure, the driving module 400 includes a voltage signal source 120 and a plurality of voltage-controlled current sources 110 for driving the diode array M (including a plurality of diode strings). The voltage signal source 120 is electrically connected to the positive input terminal of the operational amplifier Amp 1 of each voltage-controlled current source 110 (as described in FIG. 1 ), and the collector of the transistor Q2 of each voltage-controlled current source 110 is electrically connected to in the corresponding diode string X (as described in FIG. 1 ). The voltage signal source 120 is used to output the voltage V IN to control the output current of each voltage-controlled current source 110, so that each voltage-controlled current source 110 will be identical to each other, so that the entire diode array M can have the same brightness , there will be no problem of uneven brightness.

请参考图5。图5是根据本发明第二实施例的光源驱动电路500的示意图。如图所示，驱动电路500包含了一电压信号源120及一改善温度效应的电流源540。改善温度效应的电流源540包含一电压控制电流源110、一反馈电路510、一补偿电路520以及直流/直流转换器(DC/DC converter)530。电压信号源120与电压控制电流源110的运作原理如图1所述，在此不再赘述。图5相较于图1不同的部分在于：图5新增了反馈电路510、补偿电路520以及直流/直流转换器530。在图1中，偏压源VCC是固定，而在图5中，偏压源VCC的大小，将由直流/直流转换器530所输出的电压V2所决定。图5的驱动电路如此设计的目的在于：当发光二极管温度上升时，其顺向电压将会下降，也就是说，如图所示，电压VLED将会下降，而由图1可知，VCC＝VIN+VQ2+VLED，在当电压VLED下降时，多余的跨压将会落在晶体管Q2上而造成VQ2增加。如此一来，晶体管Q2消耗的功率增加，产生更多的热能，因此晶体管Q2的温度便会升高，进而影响发光二极管的温度再升高，而发光二极管的顺向电压又进而再度下降。如此循环的效果将会造成发光二极管的温度持续上升。因此，驱动电路500便设计为可将偏压源VCC作调整，当电压VLED下降时，驱动电路500同时将偏压源VCC下降相同程度的电压，如此一来电晶体Q2上的跨压将不会增加，也不会提高温度。这样便可以有效改善发光二极管的温度效应。Please refer to Figure 5. FIG. 5 is a schematic diagram of a light source driving circuit 500 according to a second embodiment of the present invention. As shown in the figure, the driving circuit 500 includes a voltage signal source 120 and a current source 540 for improving temperature effects. The current source 540 for improving temperature effects includes a voltage-controlled current source 110 , a feedback circuit 510 , a compensation circuit 520 and a DC/DC converter 530 . The operating principles of the voltage signal source 120 and the voltage-controlled current source 110 are as described in FIG. 1 , and will not be repeated here. The difference between FIG. 5 and FIG. 1 is that: FIG. 5 adds a feedback circuit 510 , a compensation circuit 520 and a DC/DC converter 530 . In FIG. 1 , the bias voltage source V CC is fixed, while in FIG. 5 , the magnitude of the bias voltage source V CC is determined by the voltage V 2 output by the DC/DC converter 530 . The driving circuit in Figure 5 is designed in such a way that when the temperature of the light-emitting diode rises, its forward voltage will drop, that is, as shown in the figure, the voltage V LED will drop, and it can be seen from Figure 1 that V CC =V IN +V Q2 +V LED , when the voltage V LED drops, the excess voltage will fall on the transistor Q 2 and cause V Q2 to increase. As a result, the power consumed by the transistor Q2 increases and more heat energy is generated, so the temperature of the transistor Q2 will rise, thereby affecting the temperature of the light-emitting diode to rise again, and the forward voltage of the light-emitting diode will drop again . The effect of such a cycle will cause the temperature of the light-emitting diode to continue to rise. Therefore, the drive circuit 500 is designed to adjust the bias source V CC . When the voltage V LED drops, the drive circuit 500 simultaneously drops the bias source V CC by the same level of voltage, so that the voltage across the transistor Q2 The pressure will not increase, nor will the temperature. In this way, the temperature effect of the light-emitting diode can be effectively improved.

请继续参考图5。反馈电路510可为一误差放大器，包含二输入端及一输出端。误差放大器的一输入端电性连接于二极管串列的一端用以接收电压VLED，另一输入端用以接收一参考电压电平VREF，其输出端可直接接到直流/直流转换器530的控制端用以控制输出电压V2的大小(然于本实施例中，误差放大器经由一补偿电路520电性连接于直流/直流转换器530)。当电压VLED高于参考电压电平VREF时，误差放大器便传送一第一预定值至直流/直流转换器530，以使输出电压V2上升；反之，当电压VLED低于参考电压电平VREF时，误差放大器便传送一第二预定值至直流/直流转换器530，以使输出电压V2下降。而补偿电路520便是用以调整该第一预定值与该第二预定值符合直流/直流转换器530所能接收的范围。Please continue to refer to Figure 5. The feedback circuit 510 can be an error amplifier including two input terminals and an output terminal. One input terminal of the error amplifier is electrically connected to one terminal of the diode series for receiving the voltage V LED , and the other input terminal is used for receiving a reference voltage level V REF , and its output terminal can be directly connected to the DC/DC converter 530 The control terminal is used to control the magnitude of the output voltage V 2 (however, in this embodiment, the error amplifier is electrically connected to the DC/DC converter 530 through a compensation circuit 520). When the voltage V LED is higher than the reference voltage level V REF , the error amplifier sends a first predetermined value to the DC/DC converter 530 to increase the output voltage V 2 ; otherwise, when the voltage V LED is lower than the reference voltage level When V REF is equal, the error amplifier transmits a second predetermined value to the DC/DC converter 530 to decrease the output voltage V 2 . The compensation circuit 520 is used to adjust the first predetermined value and the second predetermined value to meet the acceptable range of the DC/DC converter 530 .

直流/直流转换器530可为一交换式直流/直流转换器(switchingregulator)，用以接收一直流电压V1，转换其电压大小，并输出一电压V2。而电压V2的大小，便是根据直流/直流转换器530开关的导通责任比来决定，当导通的责任比越高时，电压V2就越高；反之，当导通的责任比越低时，电压V2就越低。也就是说，误差放大器所传送的第一预定值与第二预定值可以控制直流/直流转换器530开关的导通责任比，以此来调整电压V2的大小(也就是偏压VCC的大小)。The DC/DC converter 530 can be a switching regulator (switching regulator) for receiving a DC voltage V 1 , converting the voltage, and outputting a voltage V 2 . The magnitude of the voltage V2 is determined according to the conduction duty ratio of the switch of the DC/DC converter 530. When the conduction duty ratio is higher, the voltage V2 is higher; otherwise, when the conduction duty ratio is higher, the voltage V2 is higher; The lower the voltage V2 is, the lower it is. That is to say, the first predetermined value and the second predetermined value transmitted by the error amplifier can control the conduction duty ratio of the switch of the DC/DC converter 530, so as to adjust the magnitude of the voltage V 2 (that is, the bias voltage V CC size).

请参考图6。图6是根据本发明第二实施例的光源驱动模块600的示意图。如图所示，驱动模块600包含一电压信号源120与多个改善温度效应的电流源540，用以驱动二极管阵列M(包含多个二极管串列)。电压信号源120电性连接于每个电流源540的运算放大器Amp1的正输入端(如同图1所述)、而每个电流源540的晶体管Q2的集电极电性连接于对应的二极管串列X(如同图1所述)。电压信号源120用以输出电压VIN以控制每个电流源540所输出的电流，如此一来，每个电流源540都会彼此相同，而使整个二极管阵列M能够具有同等的亮度，不会产生亮度不均的问题，同时亦能解决温度上升的问题。Please refer to Figure 6. FIG. 6 is a schematic diagram of a light source driving module 600 according to a second embodiment of the present invention. As shown in the figure, the driving module 600 includes a voltage signal source 120 and a plurality of current sources 540 for improving the temperature effect to drive the diode array M (including a plurality of diode strings). The voltage signal source 120 is electrically connected to the positive input terminal of the operational amplifier Amp1 of each current source 540 (as described in FIG. 1 ), and the collector of the transistor Q2 of each current source 540 is electrically connected to the corresponding diode string. Column X (as described in Figure 1). The voltage signal source 120 is used to output the voltage V IN to control the output current of each current source 540. In this way, each current source 540 will be the same as each other, so that the entire diode array M can have the same brightness, and there will be no The problem of uneven brightness can also solve the problem of temperature rise.

综上述，本发明所提供的光源驱动电路与驱动模块，除了能够有效改善控制二极管发光不均的问题，并且对于二极管温度上升而造成顺向偏压下降的效应，亦能够有效改善。To sum up, the light source driving circuit and the driving module provided by the present invention can not only effectively improve the problem of controlling the uneven light emission of the diode, but also effectively improve the effect of reducing the forward bias voltage caused by the temperature rise of the diode.

以上所述仅为本发明的较佳实施例，凡依本发明申请专利范围所做的均等变化与修饰，皆应属本发明的涵盖范围。The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope of the present invention.

Claims (26)

1. light source driving circuit, this light source driving circuit is used to drive a LED serial, and first end of this LED serial is electrically connected at an earth terminal, and this light source driving circuit comprises:
Voltage signal source;
Voltage-controlled current source comprises:
First operational amplifier comprises:
Positive input terminal is electrically connected at this voltage signal source;
Negative input end; And
Output terminal;
The first two-carrier junction transistor comprises:
Emitter-base bandgap grading is electrically connected at the negative input end of this first operational amplifier;
Base stage is electrically connected at the output terminal of this first operational amplifier; And
Collector;
First resistance is electrically connected between the negative input end and this earth terminal of this first operational amplifier;
Second operational amplifier comprises:
Positive input terminal electrically connects the collector of this first two-carrier junction transistor;
Negative input end; And
Output terminal;
Second resistance is electrically connected between the collector and a bias generator of this first two-carrier junction transistor;
The 3rd resistance is electrically connected between the negative input end and this bias generator of this second operational amplifier; And
The second two-carrier junction transistor comprises:
Emitter-base bandgap grading is electrically connected at the negative input end of this second operational amplifier;
Base stage is electrically connected at the output terminal of this second operational amplifier; And
Collector is electrically connected at second end of this LED serial.
2. light source driving circuit as claimed in claim 1, wherein, this first and second resistance has similar resistance.
3. light source driving circuit as claimed in claim 1, wherein, this LED serial comprises the light emitting diode of a plurality of series connection.
4. light source driving circuit as claimed in claim 1, wherein, this voltage signal source is the voltage signal source of a pulse-length modulation or the voltage signal source of adjustable-voltage size.
5. light source driver module, this light source driver module is used to drive a light emitting diode matrix, and this light emitting diode matrix comprises K LED serial; Wherein, K is a positive integer, and first end of each LED serial is electrically connected at an earth terminal, and this light source driver module comprises:
Voltage signal source;
K voltage-controlled current source, each voltage-controlled current source comprises:
First operational amplifier comprises:
Positive input terminal is electrically connected at this voltage signal source;
Negative input end; And
Output terminal;
The first two-carrier junction transistor comprises:
Emitter-base bandgap grading is electrically connected at the negative input end of this first operational amplifier;
Base stage is electrically connected at the output terminal of this first operational amplifier; And
Collector;
First resistance is electrically connected between the negative input end and this earth terminal of this first operational amplifier;
Second operational amplifier comprises:
Positive input terminal electrically connects the collector of this first two-carrier junction transistor;
Negative input end; And
Output terminal;
Second resistance is electrically connected between the collector and a bias generator of this first two-carrier junction transistor;
The 3rd resistance is electrically connected between the negative input end and this bias generator of this second operational amplifier; And
The second two-carrier junction transistor comprises:
Emitter-base bandgap grading is electrically connected at the negative input end of this second operational amplifier;
Base stage is electrically connected at the output terminal of this second operational amplifier; And
Collector is electrically connected at second end of a corresponding LED serial.
6. light source driver module as claimed in claim 5, wherein, this first and second resistance has similar resistance.
7. light source driver module as claimed in claim 5, wherein, each LED serial comprises the light emitting diode of a plurality of series connection.
8. light source driver module as claimed in claim 5, wherein, this voltage signal source is the voltage signal source of a pulse-length modulation or the voltage signal source of adjustable-voltage size.
9. light source driving circuit, this light source driving circuit is used to drive a LED serial, and first end of this LED serial is electrically connected at an earth terminal, and this driving circuit comprises:
Voltage signal source;
Current source comprises:
The variable bias source;
Voltage-controlled current source comprises:
First operational amplifier comprises:
Positive input terminal is electrically connected at this voltage signal source;
Negative input end; And
Output terminal;
The first two-carrier junction transistor comprises:
Emitter-base bandgap grading is electrically connected at the negative input end of this first operational amplifier;
Base stage is electrically connected at the output terminal of this first operational amplifier; And
Collector;
First resistance is electrically connected between the negative input end and this earth terminal of this first operational amplifier;
Second operational amplifier comprises:
Positive input terminal electrically connects the collector of this first two-carrier junction transistor;
Negative input end; And
Output terminal;
Second resistance is electrically connected between the collector and this variable bias source of this first two-carrier junction transistor;
The 3rd resistance is electrically connected between the negative input end and this variable bias source of this second operational amplifier;
The second two-carrier junction transistor comprises:
Emitter-base bandgap grading is electrically connected at the negative input end of this second operational amplifier;
Base stage is electrically connected at the output terminal of this second operational amplifier; And
Collector is electrically connected at second end of this LED serial; And
Feedback circuit is electrically connected between second end and this variable bias source of this LED serial, in order to according to the voltage on second end of this LED serial, controls the voltage swing that this variable bias source is exported.
10. light source driving circuit as claimed in claim 9, wherein, when the voltage on second end of this LED serial reduced, this feedback circuit downgraded the voltage that this variable bias source is exported.
11. light source driving circuit as claimed in claim 10, wherein, this variable bias source is a DC-DC converter, is one second voltage with this first voltage transitions also in order to receive one first voltage, and the size of this second voltage is controlled by this feedback circuit.
12. light source driving circuit as claimed in claim 11, wherein, this DC-DC converter is a switch type DC-DC converter.
13. light source driving circuit as claimed in claim 9, wherein, this feedback circuit comprises an error operational amplifier, and this error operational amplifier comprises:
First input end is electrically connected at second end of this LED serial;
Second input end is in order to receive a reference voltage level; And
Output terminal is electrically connected at this variable bias source, in order to according to the voltage level of this first input end of this error operational amplifier and the voltage level of this second input end, exports the voltage level of one first predetermined value or the voltage level of one second predetermined value.
14. light source driving circuit as claimed in claim 13; Also comprise a compensating circuit; Be electrically connected between this error operational amplifier and this variable bias source, in order to the voltage level of the voltage level of adjusting this first predetermined value or this second predetermined value to suitable size to meet this receptible scope in variable bias source.
15. light source driving circuit as claimed in claim 9, wherein, this first and second resistance has similar resistance.
16. light source driving circuit as claimed in claim 9, wherein, this LED serial comprises the light emitting diode of a plurality of series connection.
17. light source driving circuit as claimed in claim 9, wherein, this voltage signal source is the voltage signal source of a pulse-length modulation or the voltage signal source of adjustable-voltage size.
18. a light source driver module, this light source driver module is used to drive a light emitting diode matrix, and this light emitting diode matrix comprises K LED serial; Wherein, K is a positive integer, and first end of each LED serial is electrically connected at an earth terminal, and this driver module comprises:
Voltage signal source;
K current source, each current source comprises:
The variable bias source;
One VCCS comprises:
First operational amplifier comprises:
Positive input terminal is electrically connected at this voltage signal source;
Negative input end; And
Output terminal;
The first two-carrier junction transistor comprises:
Emitter-base bandgap grading is electrically connected at the negative input end of this first operational amplifier;
Base stage is electrically connected at the output terminal of this first operational amplifier; And
Collector;
First resistance is electrically connected between the negative input end and this earth terminal of this first operational amplifier;
Second operational amplifier comprises:
Positive input terminal electrically connects the collector of this first two-carrier junction transistor;
Negative input end; And
Output terminal;
Second resistance is electrically connected between the collector and this variable bias source of this first two-carrier junction transistor;
The 3rd resistance is electrically connected between the negative input end and this variable bias source of this second operational amplifier;
The second two-carrier junction transistor comprises:
Emitter-base bandgap grading is electrically connected at the negative input end of this second operational amplifier;
Base stage is electrically connected at the output terminal of this second operational amplifier; And
Collector is electrically connected at second end of a corresponding LED serial; And
Feedback circuit is electrically connected between second end and this variable bias source of this corresponding LED serial, in order to according to the voltage on second end of this LED serial of correspondence, controls the voltage swing that this variable bias source is exported.
19. light source driver module as claimed in claim 18, wherein, when the voltage on second end of this LED serial of correspondence reduced, this feedback circuit downgraded the voltage that this variable bias source is exported.
20. light source driver module as claimed in claim 18, wherein, this variable bias source is a DC-DC converter, is one second voltage with this first voltage transitions also in order to receive one first voltage, and the size of this second voltage is controlled by this feedback circuit.
21. light source driver module as claimed in claim 20, wherein, this DC-DC converter is a switch type DC-DC converter.
22. light source driver module as claimed in claim 21, wherein, this feedback circuit comprises an error operational amplifier, and this error operational amplifier comprises:
First input end is electrically connected at second end of this corresponding LED serial;
Second input end is in order to receive a reference voltage level; And
Output terminal is electrically connected at this variable bias source, in order to according to the voltage level of this first input end of this error operational amplifier and the voltage level of this second input end, exports the voltage level of one first predetermined value or the voltage level of one second predetermined value.
23. light source driver module as claimed in claim 22; Also comprise a compensating circuit; Be electrically connected between this error operational amplifier and this variable bias source, in order to the voltage level of the voltage level of adjusting this first predetermined value or this second predetermined value to suitable size to meet the receptible scope of this switch type DC-DC converter.
24. light source driver module as claimed in claim 18, wherein, this first and second resistance has similar resistance.
25. light source driver module as claimed in claim 18, wherein, each LED serial comprises the light emitting diode of a plurality of series connection.
26. light source driver module as claimed in claim 18, wherein, this voltage signal source is the voltage signal source of a pulse-length modulation or the voltage signal source of adjustable-voltage size.
CN200810082121XA 2008-03-03 2008-03-03 Light source driver module and circuit Expired - Fee Related CN101527988B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN200810082121XA CN101527988B (en) 2008-03-03 2008-03-03 Light source driver module and circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN200810082121XA CN101527988B (en) 2008-03-03 2008-03-03 Light source driver module and circuit

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CN102102828B (en) * 2009-12-18 2014-02-05 华映视讯（吴江）有限公司 LED (Light-Emitting Diode) module
CN102956202A (en) * 2011-08-29 2013-03-06 通嘉科技股份有限公司 Current control stage, constant current control system, and current control method
CN110189709B (en) * 2018-02-23 2020-12-29 京东方科技集团股份有限公司 Control circuit, backlight driving device and display device
TWI692273B (en) * 2019-06-05 2020-04-21 茂達電子股份有限公司 System and method of driving led string
CN113282130A (en) * 2021-06-08 2021-08-20 西安中颖电子有限公司 High-precision LED constant current driving circuit
CN113484367A (en) * 2021-07-07 2021-10-08 上海电气数智生态科技有限公司 Circuit and method for improving measurement precision of multi-channel water quality sensor
CN115294928B (en) * 2022-10-08 2022-12-27 成都利普芯微电子有限公司 Shadow elimination circuit, line driving circuit and display screen

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