WO2014183322A1 - 光源模组、光源模组的驱动电路及驱动方法 - Google Patents

光源模组、光源模组的驱动电路及驱动方法 Download PDF

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Publication number
WO2014183322A1
WO2014183322A1 PCT/CN2013/078106 CN2013078106W WO2014183322A1 WO 2014183322 A1 WO2014183322 A1 WO 2014183322A1 CN 2013078106 W CN2013078106 W CN 2013078106W WO 2014183322 A1 WO2014183322 A1 WO 2014183322A1
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Prior art keywords
resistor
light source
enable signal
voltage
output
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PCT/CN2013/078106
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English (en)
French (fr)
Inventor
张华�
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Priority to US13/985,614 priority Critical patent/US9204515B2/en
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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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/375—Switched mode power supply [SMPS] using buck topology
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/0289—Details of voltage level shifters arranged for use in a driving circuit
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source

Definitions

  • the present invention relates to the field of display driving, and in particular to a light source module, a driving circuit of a light source module, and a driving method.
  • the light source module is one of the necessary components of the liquid crystal display module, and is used to provide a desired light source for the liquid crystal display panel.
  • the LED light source module is currently the most commonly used light source module.
  • the driving circuit of the existing LED light source module needs to provide three external control signals: input voltage V1, enable signal ENA, and dimming signal PWM. .
  • the input voltage V1, the enable signal ENA, and the dimming signal PWM are respectively connected to the power terminal of the driving chip 16, the enable control terminal, and the modulation signal input terminal.
  • the input voltage V1 is used to supply power to the light source module, the enable signal ENA controls the turning on and off of the light source 12, and the dimming signal PWM is used to control the luminous intensity of the light source 12.
  • the input voltage V1 is provided by the power supply 11, the enable signal ENA is input by the external enable signal source 13, and the dimming signal PWM is input by the external dimming signal source 14.
  • the input voltage V1 the enable signal ENA and the dimming signal PWM are all controlled by external input, and the three are indispensable, so the product design
  • the control of the entire driving circuit is complicated, which is not convenient for product testing and line adjustment; and when the externally provided enable signal ENA or the dimming signal PWM is disturbed, the entire circuit will not work normally, and the test is increased. Work load and reduce work efficiency.
  • the technical problem to be solved by the present invention is to provide a light source module, a driving circuit and a driving method of the light source module, which can enable the driving circuit of the light source module to have an input voltage to generate an enabling signal and a dimming signal, thereby making the light source
  • the module works fine.
  • a technical solution adopted by the present invention is to provide a driving circuit of a light source module, the driving circuit comprising: a power supply, providing an input voltage; a control signal generating circuit, an input voltage provided by the input power source, and outputting The enable signal and the dimming signal; the driving chip is connected to the power source, and is connected to the enable signal and the dimming signal outputted by the control signal generating circuit to drive the light source of the light source module according to the enable signal and the dimming signal.
  • control signal generating circuit is a step-down circuit, and an input signal with a higher voltage generates an enable signal and a dimming signal with a lower voltage.
  • the control signal generating circuit comprises: a buck chip, the input end of the buck chip is connected to the power source, the output end outputs a stable voltage VLDO_OUT lower than the input voltage; the first resistor, the first end of the first resistor is connected to the buck chip a second resistor, the first end of the second resistor is connected to the second end of the first resistor, and the second end of the second resistor is grounded; the third resistor, the first end of the third resistor is connected to the output end of the buck chip a fourth resistor, the first end of the fourth resistor is connected to the second end of the third resistor, and the second end of the fourth resistor is grounded; wherein the second end of the first resistor is connected to the first end of the second resistor
  • the signal output end is an enable signal; the node connected to the second end of the third resistor and the first end of the fourth resistor is a dimming signal output end.
  • the enable signal output end of the control signal generating circuit is connected to the external enable signal source, and the external enable signal provided by the external enable signal source is output;
  • the dimming signal output end of the control signal generating circuit is connected to the external dimming signal source, and the output is External dimming signal from an external dimming source.
  • the resistance value R1 of the first resistor and the resistance value R3 of the third resistor are compatible with the safe power consumption Ps1 and Ps3, And the stable voltage VLDO_OUT meets the following requirements:
  • Another technical solution adopted by the present invention is to provide a light source module, wherein
  • the driving circuit comprises: a power source, an input voltage; a control signal generating circuit, an input voltage provided by the input power source, and an output enable signal and a dimming signal; a driving chip connected to the power source and connected to the output of the control signal generating circuit The energy signal and the dimming signal are used to drive the light source of the light source module according to the enable signal and the dimming signal.
  • control signal generating circuit is a step-down circuit, and an input signal with a higher voltage generates an enable signal and a dimming signal with a lower voltage.
  • the control signal generating circuit comprises: a buck chip, the input end of the buck chip is connected to the power source, the output end outputs a stable voltage VLDO_OUT lower than the input voltage; the first resistor, the first end of the first resistor is connected to the buck chip a second resistor, the first end of the second resistor is connected to the second end of the first resistor, and the second end of the second resistor is grounded; the third resistor, the first end of the third resistor is connected to the output end of the buck chip a fourth resistor, the first end of the fourth resistor is connected to the second end of the third resistor, and the second end of the fourth resistor is grounded; wherein the second end of the first resistor is connected to the first end of the second resistor
  • the signal output end is an enable signal; the node connected to the second end of the third resistor and the first end of the fourth resistor is a dimming signal output end.
  • the enable signal output end of the control signal generating circuit is connected to the external enable signal source, and the external enable signal provided by the external enable signal source is output;
  • the dimming signal output end of the control signal generating circuit is connected to the external dimming signal source, and the output is External dimming signal from an external dimming source.
  • the resistance value R1 of the first resistor and the resistance value R3 of the third resistor are compatible with the safe power consumption Ps1 and Ps3, And the stable voltage VLDO_OUT meets the following requirements:
  • another technical solution adopted by the present invention is to provide a driving method of a light source module, wherein the driving method includes the steps of: obtaining an output voltage provided by a power source; and adjusting an output voltage to generate an output voltage for use The enable signal and the dimming signal of the driving light source module.
  • the step of adjusting the output voltage to generate an enable signal and a dimming signal for driving the light source module by using the output voltage includes: stepping down the output voltage to output a stable voltage VLDO_OUT lower than the output voltage; The resistor divides the voltage to generate an enable signal and a dimming signal using a stable voltage.
  • the step of dividing the voltage by the resistor is: dividing the first resistor and the second resistor, and the node connected to the second end of the first resistor and the first end of the second resistor is an enable signal output end, and the output enable signal is output.
  • the third resistor and the fourth resistor are divided by a voltage, and the node connected to the second end of the third resistor and the first end of the fourth resistor is a dimming signal output end; wherein the resistance of the first resistor is R1 and the second resistor
  • the relationship between the resistance value R2, the resistance value R3 of the third resistor, the resistance value R4 of the fourth resistor, the stable voltage VLDO_OUT, the voltage VENA of the enable signal, and the voltage VPWM of the dimming signal are:
  • VENA VLDO_OUT ⁇ (R2 /(R1+ R2));
  • VPWM VLDO_OUT ⁇ (R4 / (R3 + R4)).
  • the present invention converts the input voltage into an enable signal and a dimming signal through a control signal generating circuit that connects the input voltage, so that the input voltage replaces the external control to form an enable.
  • the signal and the dimming signal do not need to provide a control enable signal and a dimming signal from the outside. Therefore, it is only necessary to provide an input voltage externally to control the normal operation of the light source module, which makes the control more convenient and reliable.
  • FIG. 1 is a schematic view of a light source module in the prior art
  • FIG. 2 is a schematic view of a light source module according to a first embodiment of the present invention
  • FIG. 3 is a flow chart showing a driving method of a light source module according to a second embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a display module in accordance with a third embodiment of the present invention.
  • FIG. 2 is a schematic diagram of a light source module according to a first embodiment of the present invention.
  • the driving circuit of the light source module according to the first embodiment of the present invention includes a power source 21, a control signal generating circuit 25, and a driving chip 26.
  • the power source 21 provides an input voltage V2.
  • the power source 21 is typically an external power source 21 that can be converted by utility power or by battery.
  • the control signal generating circuit 25 inputs the input voltage V2 supplied from the power source 21, and outputs an enable signal ENA and a dimming signal PWM.
  • the voltage value of the input voltage V2 is higher than the voltage values of the enable signal ENA and the dimming signal PWM.
  • the voltage value of the input voltage V2 is generally 24V, and the voltage value of the enable signal ENA and the dimming signal PWM is generally 3.3V. Therefore, in the present embodiment, the control signal generating circuit 25 is a step-down circuit that generates a lower voltage enable signal ENA and a dimming signal PWM from a higher voltage input voltage V2.
  • the control signal generating circuit 25 includes a buck chip 27, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4.
  • the input end of the buck chip 27 is connected to the power source 21, that is, the input terminal inputs the input voltage V2 supplied from the power source 21, and the output terminal outputs a stable voltage VLDO_OUT lower than the input voltage.
  • VLDO_OUT is greater than the voltage value of the enable signal ENA and the dimming signal PWM, but less than the voltage value of the input voltage V2.
  • the size of VLDO_OUT can be adjusted according to actual needs, which is not limited here.
  • the first end of the first resistor R1 is connected to the output end of the buck chip 27.
  • the first end of the second resistor R2 is connected to the second end of the first resistor R1, and the second end of the second resistor R2 is grounded.
  • the node connecting the second end of the first resistor R1 and the first end of the second resistor R2 is an enable signal ENA output end.
  • the first end of the third resistor R3 is connected to the output end of the buck chip 27.
  • the first end of the fourth resistor R4 is connected to the second end of the third resistor R3, and the second end of the fourth resistor R4 is grounded.
  • the node connecting the second end of the third resistor R3 and the first end of the fourth resistor R4 is a dimming signal PWM output end.
  • the input voltage V2 can be converted into the enable signal ENA and the dimming signal PWM.
  • the resistance of the first resistor R1, the resistance of the second resistor R2, the resistance of the third resistor R3, the resistance of the fourth resistor R4, the stable voltage VLDO_OUT, and the voltage VENA of the enable signal ENA, the dimming signal PWM The relationship of voltage VPWM is:
  • VENA VLDO_OUT ⁇ (R2/(R1+ R2));
  • VPWM VLDO_OUT ⁇ (R4 / (R3 + R4)).
  • the driving chip 26 is connected to the power source 21, and is connected to the enable signal ENA and the dimming signal PWM outputted by the control signal generating circuit 25 to drive the light source 22 of the light source module according to the enable signal ENA and the dimming signal PWM.
  • control signal generating circuit 25 of the present invention can be compatible with an external control circuit, that is, the enable signal ENA and the dimming signal PWM can still be externally controlled, and the control signal generating circuit 25 can be enabled.
  • the signal output terminal is connected to the external enable signal source 23 to output an external enable signal provided by the external enable signal source 23; the dimming signal output terminal of the control signal generating circuit 25 is connected to the external dimming signal source 24 to output an external tone.
  • the node of the second end of the first resistor R1 and the first end of the second resistor R2 is further connected to the external enable signal source 23, the second end of the third resistor R3 and the first end of the fourth resistor R4.
  • the connected nodes are further connected to an external dimming signal source 24.
  • the operation of the control signal generating circuit 25 is not affected.
  • the external enable signal provided by the external enable signal source 23 or the external dimming signal provided by the external dimming signal source 24 is at a low level, the stable voltage VLDO_OUT outputted by the buck chip 27 is all consumed in the first resistor R1 and On the third resistor R3, the voltages on the second resistor R2 and the fourth resistor R4 are zero, and the external enable signal and the external dimming signal are directly input to the driving chip 26. That is to say, at this time, the driving chip 26 is directly controlled by the external enabling signal and the external dimming signal, and is not controlled by the control signal generating circuit 25, thereby achieving compatibility between internal control and external control.
  • the first resistor R1 and the third resistor R3 are not burned out when the external control signal is connected, the first resistor R1 and the third resistor R3
  • the stable power VLDO_OUT output from the safe power consumption Ps1, Ps3, and buck chip 27 can meet the following requirements:
  • FIG. 3 is a flowchart of a driving method of a light source module according to a second embodiment of the present invention.
  • the driving method of the light source module includes:
  • step S11 the output voltage supplied by the power source is obtained.
  • step S12 the output voltage is adjusted to generate an enable signal and a dimming signal for driving the light source module using the output voltage.
  • step S12 the output voltage is first stepped down to output a stable voltage VLDO_OUT lower than the output voltage. Then, through the resistor division, the enable signal and the dimming signal are generated by the stable voltage.
  • the first resistor and the second resistor are divided, and the node connected to the second end of the first resistor and the first end of the second resistor is an enable signal output terminal, and an enable signal is output.
  • the third resistor and the fourth resistor are divided, and the node connected to the second end of the third resistor and the first end of the fourth resistor is a dimming signal output end.
  • the resistance R1 of the first resistor, the resistance R2 of the second resistor, the resistance R3 of the third resistor, the resistance R4 of the fourth resistor, the stable voltage VLDO_OUT, and the voltage of the enable signal VENA the voltage of the dimming signal
  • the relationship between VPWM is:
  • VENA VLDO_OUT ⁇ R2/(R1+ R2)
  • VPWM VLDO_OUT ⁇ R4/(R3+ R4).
  • FIG. 4 is a schematic diagram of a display module according to a third embodiment of the present invention.
  • the display module includes a display panel 31 and a light source module 32 for providing the display panel 31 with a desired light source.
  • the light source module 32 is the light source module described in the first embodiment.
  • the present invention converts the input voltage into an enable signal and a dimming signal through a control signal generating circuit that connects the input voltage, so that the input voltage replaces the external control signal to form an enable signal and a dimming signal, and no external control is required.
  • Enable signal and dimming signal Therefore, it is only necessary to provide an input voltage externally to control the normal operation of the light source module, which makes the control more convenient and reliable, and is more convenient for the designer to perform product testing and line adjustment, thereby improving work efficiency.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

一种光源模组（32）、光源模组（32）的驱动电路及驱动方法。该驱动电路包括:电源（21），提供输入电压（V2）；控制信号发生电路（25），其输入电源（21）提供的输入电压（V2），并输出使能信号（ENA）以及调光信号（PWM）；驱动芯片（26），与电源（21）连接，并连接控制信号发生电路（25）输出的使能信号（ENA）以及调光信号（PWM），以根据使能信号（ENA）与调光信号（PWM）驱动光源模组（32）的光源（22）。通过上述方式，该光源模组（32）、光源模组（32）的驱动电路及驱动方法利用输入电压（V2）产生使能信号（ENA）以及调光信号（PWM），因此仅需外部提供输入电压（V2）便可控制光源模组（32）正常工作，使控制更加方便可靠。

Description

光源模组、光源模组的驱动电路及驱动方法
【技术领域】
本发明涉及显示驱动领域，特别是涉及一种光源模组、光源模组的驱动电路及驱动方法。
【背景技术】
光源模组是液晶显示模组的必要组件之一，用于为液晶显示面板提供所需的光源。
LED光源模组是目前最常用的光源模组，如图1所示，现有的LED光源模组的驱动电路需要外部提供三种控制信号：输入电压V1、使能信号ENA以及调光信号PWM。其中，输入电压V1、使能信号ENA以及调光信号PWM分别连接驱动芯片16的电源端、使能控制端以及调制信号输入端。输入电压V1用于为光源模组供电，使能信号ENA控制光源12的开启与关闭，调光信号PWM则用于控制光源12的发光强度。其中，输入电压V1由电源11提供，使能信号ENA由外部使能信号源13输入，调光信号PWM由外部调光信号源14输入。
由此可以看出，现有的LED光源模组的驱动电路中，输入电压V1、使能信号ENA和调光信号PWM都是由外部输入控制，且三者缺一不可，因此在产品的设计以及实验验证阶段，整个驱动电路的控制较为复杂，不便于进行产品测试及线路调整；且当外部提供的使能信号ENA或者调光信号PWM受到干扰时，整个电路将不能正常工作，增加测试的工作负担，降低工作效率。
【发明内容】
本发明主要解决的技术问题是提供一种光源模组、光源模组的驱动电路及驱动方法，能够使光源模组的驱动电路具有输入电压便可产生使能信号和调光信号，从而使光源模组可正常工作。
为解决上述问题，本发明采用的一个技术方案是：提供一种光源模组的驱动电路，该驱动电路包括:电源，提供输入电压；控制信号发生电路，其输入电源提供的输入电压，并输出使能信号以及调光信号；驱动芯片，与电源连接，并连接控制信号发生电路输出的使能信号以及调光信号，以根据使能信号与调光信号驱动光源模组的光源。
其中，控制信号发生电路为降压电路，由电压较高的输入电压，产生电压较低的使能信号和调光信号。
其中，控制信号发生电路包括：降压芯片，降压芯片的输入端连接电源，输出端输出一较输入电压低的稳定电压VLDO_OUT；第一电阻，第一电阻的第一端连接降压芯片的输出端；第二电阻，第二电阻的第一端连接第一电阻的第二端，第二电阻的第二端接地；第三电阻，第三电阻的第一端连接降压芯片的输出端；第四电阻，第四电阻的第一端连接第三电阻的第二端，第四电阻的第二端接地；其中，第一电阻的第二端与第二电阻的第一端相连的节点为使能信号输出端；第三电阻的第二端与第四电阻的第一端相连的节点为调光信号输出端。
其中，控制信号发生电路的使能信号输出端连接外部使能信号源，输出外部使能信号源提供的外部使能信号；控制信号发生电路的调光信号输出端连接外部调光信号源，输出外部调光信号源提供的外部调光信号。
其中，第一电阻的阻值R1和第三电阻的阻值R3 与其所能承受的安全功耗Ps1 、Ps3, 及稳定电压VLDO_OUT满足下式要求：
R1 > (V2LDO_OUT)/Ps1，R3 > (V2LDO_OUT)/Ps3。
为解决上述问题，本发明采用的另一个技术方案是：提供一种光源模组，其中，
该驱动电路包括:电源，提供输入电压；控制信号发生电路，其输入电源提供的输入电压，并输出使能信号以及调光信号；驱动芯片，与电源连接，并连接控制信号发生电路输出的使能信号以及调光信号，以根据使能信号与调光信号驱动光源模组的光源。
其中，控制信号发生电路为降压电路，由电压较高的输入电压，产生电压较低的使能信号和调光信号。
其中，控制信号发生电路包括：降压芯片，降压芯片的输入端连接电源，输出端输出一较输入电压低的稳定电压VLDO_OUT；第一电阻，第一电阻的第一端连接降压芯片的输出端；第二电阻，第二电阻的第一端连接第一电阻的第二端，第二电阻的第二端接地；第三电阻，第三电阻的第一端连接降压芯片的输出端；第四电阻，第四电阻的第一端连接第三电阻的第二端，第四电阻的第二端接地；其中，第一电阻的第二端与第二电阻的第一端相连的节点为使能信号输出端；第三电阻的第二端与第四电阻的第一端相连的节点为调光信号输出端。
其中，控制信号发生电路的使能信号输出端连接外部使能信号源，输出外部使能信号源提供的外部使能信号；控制信号发生电路的调光信号输出端连接外部调光信号源，输出外部调光信号源提供的外部调光信号。
其中，第一电阻的阻值R1和第三电阻的阻值R3 与其所能承受的安全功耗Ps1 、Ps3, 及稳定电压VLDO_OUT满足下式要求：
R1 > (V2LDO_OUT)/Ps1，R3 > (V2LDO_OUT)/Ps3。
为解决上述问题，本发明采用的又一个技术方案是：提供一种光源模组的驱动方法，其中，驱动方法包括步骤：获取电源提供的输出电压；调整输出电压，以利用输出电压产生用于驱动光源模组的使能信号以及调光信号。
其中，调整输出电压，以利用输出电压产生用于驱动光源模组的使能信号以及调光信号的步骤包括：对输出电压进行降压处理，以输出一低于输出电压的稳定电压VLDO_OUT；通过电阻分压，利用稳定电压产生使能信号以及调光信号。
其中，通过电阻分压的步骤为：利用第一电阻与第二电阻分压，第一电阻的第二端与第二电阻的第一端相连的节点为使能信号输出端，输出使能信号；利用第三电阻与第四电阻分压，第三电阻的第二端与第四电阻的第一端相连的节点为调光信号输出端；其中，第一电阻的阻值R1、第二电阻的阻值R2、第三电阻的阻值R3、第四电阻的阻值R4、稳定电压VLDO_OUT以及使能信号的电压VENA、调光信号的电压VPWM的关系为：
VENA= VLDO_OUT×（R2 /(R1+ R2)）;
VPWM= VLDO_OUT×（R4 /(R3+ R4)）。
本发明的有益效果是：区别于现有技术的情况，本发明通过连接输入电压的控制信号发生电路，将输入电压转化为使能信号以及调光信号，使得输入电压替代外部控制来形成使能信号以及调光信号，不需要从外部提供控制使能信号以及调光信号。因此，仅需外部提供输入电压便可控制光源模组正常工作，使控制更加方便可靠。
【附图说明】
图1是现有技术中的光源模组的示意图；
图2是本发明第一实施例的光源模组的示意图；
图3是本发明第二实施例的光源模组的驱动方法的流程图；
图4是本发明第三实施例的显示模组的示意图。
【具体实施方式】
请参阅图2，图2为本发明第一实施例的光源模组的示意图。本发明第一实施例的光源模组的驱动电路包括电源21、控制信号发生电路25以及驱动芯片26。
电源21提供输入电压V2。电源21一般为外部电源21，可通过市电转换或者通过电池转换。
控制信号发生电路25输入电源21提供的输入电压V2，并输出使能信号ENA以及调光信号PWM。一般的，输入电压V2的电压值比使能信号ENA以及调光信号PWM的电压值要高。输入电压V2的电压值一般为24V，而使能信号ENA以及调光信号PWM的电压值一般为3.3V。因此，在本实施例中，控制信号发生电路25为降压电路，由电压较高的输入电压V2，产生电压较低的使能信号ENA和调光信号PWM。
在本实施例中，控制信号发生电路25包括降压芯片27、第一电阻R1、第二电阻R2、第三电阻R3以及第四电阻R4。降压芯片27的输入端连接电源21，即输入端输入电源21提供的输入电压V2，输出端输出一较输入电压低的稳定电压VLDO_OUT。其中，VLDO_OUT大于使能信号ENA以及调光信号PWM的电压值，但小于输入电压V2的电压值。VLDO_OUT的大小可根据实际需要来进行调整，此处不对其进行限定。第一电阻R1的第一端连接降压芯片27的输出端，第二电阻R2的第一端连接第一电阻R1的第二端，第二电阻R2的第二端接地。其中，第一电阻R1的第二端与第二电阻R2的第一端相连的节点为使能信号ENA输出端。第三电阻R3的第一端连接降压芯片27的输出端，第四电阻R4的第一端连接第三电阻R3的第二端，第四电阻R4的第二端接地。其中，第三电阻R3的第二端与第四电阻R4的第一端相连的节点为调光信号PWM输出端。
通过上述方式，可以将输入电压V2转换为使能信号ENA以及调光信号PWM。其中，第一电阻R1的阻值、第二电阻R2的阻值、第三电阻R3的阻值、第四电阻R4的阻值、稳定电压VLDO_OUT以及使能信号ENA的电压VENA、调光信号PWM的电压VPWM的关系为：
VENA= VLDO_OUT×（R2/(R1+ R2)）；
VPWM= VLDO_OUT×（R4 /(R3+ R4)）。
驱动芯片26与电源21连接，并连接控制信号发生电路25输出的使能信号ENA以及调光信号PWM，以根据使能信号ENA与调光信号PWM驱动光源模组的光源22。
而为了满足不同的客户需求，本发明的控制信号发生电路25可与外部控制线路兼容，即：使使能信号ENA以及调光信号PWM仍然能够受外部控制，将控制信号发生电路25的使能信号输出端连接外部使能信号源23，以输出外部使能信号源23提供的外部使能信号；将控制信号发生电路25的调光信号输出端连接外部调光信号源24，以输出外部调光信号源24提供的外部调光信号。也就是说，第一电阻R1的第二端与第二电阻R2的第一端相连的节点进一步连接外部使能信号源23，第三电阻R3的第二端与第四电阻R4的第一端相连的节点进一步连接外部调光信号源24。
并且，本发明中，当外部使能信号源23提供的外部使能信号或外部调光信号源24提供的外部调光信号为高电平时，不会对控制信号发生电路25的工作造成影响。而当外部使能信号源23提供的外部使能信号或外部调光信号源24提供的外部调光信号为低电平时，降压芯片27输出的稳定电压VLDO_OUT会全部消耗在第一电阻R1和第三电阻R3上，第二电阻R2和第四电阻R4上的电压为零，外部使能信号与外部调光信号直接输入至驱动芯片26。也就是说，此时驱动芯片26直接受外部使能信号与外部调光信号的控制，而不受控制信号发生电路25的控制，实现了内部控制和外部控制的兼容。
并且，为了保证接入外部控制信号时，第一电阻R1和第三电阻R3不被烧坏，因此第一电阻R1和第三电阻R3 与其所能承受的安全功耗Ps1 、Ps3, 及降压芯片27输出的稳定电压VLDO_OUT满足下式要求：
R1> (V2LDO_OUT)/Ps1，R3 > (V2LDO_OUT)/Ps3。
参阅图3，图3是本发明第二实施例的光源模组的驱动方法的流程图。在本实施例中，光源模组的驱动方法包括：
在步骤S11中，获取电源提供的输出电压。
在步骤S12中，调整输出电压，以利用输出电压产生用于驱动光源模组的使能信号以及调光信号。
具体的，在步骤S12中，先对输出电压进行降压处理，以输出一低于输出电压的稳定电压VLDO_OUT。然后再通过电阻分压，利用稳定电压产生使能信号以及调光信号。
具体的分压方式可参照上一实施例。例如，利用第一电阻与第二电阻分压，第一电阻的第二端与第二电阻的第一端相连的节点为使能信号输出端，输出使能信号。利用第三电阻与第四电阻分压，第三电阻的第二端与第四电阻的第一端相连的节点为调光信号输出端。其中，第一电阻的阻值R1、第二电阻的阻值R2、第三电阻的阻值R3、第四电阻的阻值R4、稳定电压VLDO_OUT以及使能信号的电压VENA、调光信号的电压VPWM的关系为：
VENA= VLDO_OUT×R2/(R1+ R2);
VPWM= VLDO_OUT×R4/(R3+ R4) 。
本发明进一步提供一种显示模组。参阅图4，图4是本发明第三实施例的显示模组的示意图。在本实施例中，显示模组包括显示面板31与用于为显示面板31提供所需光源的光源模组32。其中，光源模组32为第一实施例所述的光源模组。
通过上述方式，本发明通过连接输入电压的控制信号发生电路，将输入电压转化为使能信号以及调光信号，使得输入电压替代外部控制信号来形成使能信号以及调光信号，不需要外部控制使能信号以及调光信号。因此，仅需外部提供输入电压便可控制光源模组正常工作，使控制更加方便可靠，更便于设计人员进行产品测试以及线路调整，提高工作效率。
以上所述仅为本发明的实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (13)

  1. 一种光源模组的驱动电路，其中，所述驱动电路包括:
    电源，提供输入电压；
    控制信号发生电路，其输入所述电源提供的所述输入电压，并输出使能信号以及调光信号；
    驱动芯片，与所述电源连接，并连接所述控制信号发生电路输出的所述使能信号以及所述调光信号，以根据所述使能信号与所述调光信号驱动所述光源模组的光源。
  2. 根据权利要求1所述的驱动电路，其中，所述控制信号发生电路为降压电路，由电压较高所述的输入电压，产生电压较低的所述使能信号和所述调光信号。
  3. 根据权利要求1所述的驱动电路，其中，所述控制信号发生电路包括：
    降压芯片，所述降压芯片的输入端连接所述电源，输出端输出一较所述输入电压低的稳定电压VLDO_OUT；
    第一电阻，所述第一电阻的第一端连接所述降压芯片的输出端；
    第二电阻，所述第二电阻的第一端连接所述第一电阻的第二端，所述第二电阻的第二端接地；
    第三电阻，所述第三电阻的第一端连接所述降压芯片的输出端；
    第四电阻，所述第四电阻的第一端连接所述第三电阻的第二端，所述第四电阻的第二端接地；
    其中，所述第一电阻的第二端与所述第二电阻的第一端相连的节点为使能信号输出端；
    所述第三电阻的第二端与所述第四电阻的第一端相连的节点为调光信号输出端。
  4. 根据权利要求3所述的驱动电路，其中，所述控制信号发生电路的所述使能信号输出端连接外部使能信号源，输出所述外部使能信号源提供的外部使能信号；
    所述控制信号发生电路的所述调光信号输出端连接外部调光信号源，输出所述外部调光信号源提供的外部调光信号。
  5. 根据权利要求4所述的驱动电路，其中，所述第一电阻的阻值R1和所述第三电阻的阻值R3 与其所能承受的安全功耗Ps1 、Ps3, 及所述稳定电压VLDO_OUT满足下式要求：
    R1 > (V2LDO_OUT)/Ps1，R3 > (V2LDO_OUT)/Ps3。
  6. 一种光源模组，其中，所述光源模组包括光源以及驱动电路，所述驱动电路连接所述光源，以驱动所述光源，其中，所述驱动电路包括:
    电源，提供输入电压；
    控制信号发生电路，其输入所述电源提供的所述输入电压，并输出使能信号以及调光信号；
    驱动芯片，与所述电源连接，并连接所述控制信号发生电路输出的所述使能信号以及所述调光信号，以根据所述使能信号与所述调光信号驱动所述光源。
  7. 根据权利要求6所述的光源模组，其中，所述控制信号发生电路为降压电路，由电压较高所述的输入电压，产生电压较低的所述使能信号和所述调光信号。
  8. 根据权利要求6所述的光源模组，其中，所述控制信号发生电路包括：
    降压芯片，所述降压芯片的输入端连接所述电源，输出端输出一较所述输入电压低的稳定电压VLDO_OUT；
    第一电阻，所述第一电阻的第一端连接所述降压芯片的输出端；
    第二电阻，所述第二电阻的第一端连接所述第一电阻的第二端，所述第二电阻的第二端接地；
    第三电阻，所述第三电阻的第一端连接所述降压芯片的输出端；
    第四电阻，所述第四电阻的第一端连接所述第三电阻的第二端，所述第四电阻的第二端接地；
    其中，所述第一电阻的第二端与所述第二电阻的第一端相连的节点为使能信号输出端；
    所述第三电阻的第二端与所述第四电阻的第一端相连的节点为调光信号输出端。
  9. 根据权利要求8所述的光源模组，其中，所述控制信号发生电路的所述使能信号输出端连接外部使能信号源，输出所述外部使能信号源提供的外部使能信号；
    所述控制信号发生电路的所述调光信号输出端连接外部调光信号源，输出所述外部调光信号源提供的外部调光信号。
  10. 根据权利要求9所述的光源模组，其中，所述第一电阻的阻值R1和所述第三电阻的阻值R3 与其所能承受的安全功耗Ps1 、Ps3, 及所述稳定电压VLDO_OUT满足下式要求：
    R1 > (V2LDO_OUT)/Ps1，R3 > (V2LDO_OUT)/Ps3。
  11. 一种光源模组的驱动方法，其中，所述驱动方法包括步骤：
    获取电源提供的输出电压；
    调整所述输出电压，以利用所述输出电压产生用于驱动所述光源模组的使能信号以及调光信号。
  12. 根据权利要求11所述的驱动方法，其中，所述调整输出电压，以利用所述输出电压产生用于驱动所述光源模组的使能信号以及调光信号的步骤包括：
    对所述输出电压进行降压处理，以输出一低于所述输出电压的稳定电压VLDO_OUT；
    通过电阻分压，利用所述稳定电压产生所述使能信号以及所述调光信号。
  13. 根据权利要求12所述的驱动方法，其中，通过电阻分压的步骤为：利用第一电阻与第二电阻分压，所述第一电阻的第二端与所述第二电阻的第一端相连的节点为使能信号输出端，以输出所述使能信号；利用第三电阻与第四电阻分压，所述第三电阻的第二端与所述第四电阻的第一端相连的节点为调光信号输出端，以输出所述调光信号；其中，所述第一电阻的阻值R1、所述第二电阻的阻值R2、所述第三电阻的阻值R3、所述第四电阻的阻值R4、所述稳定电压VLDO_OUT以及所述使能信号的电压VENA、所述调光信号的电压VPWM的关系为：
    VENA= VLDO_OUT×（R2 /(R1+ R2)）;
    VPWM= VLDO_OUT×（R4 /(R3+ R4)）。
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Families Citing this family (2)

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Publication number Priority date Publication date Assignee Title
CN108768353B (zh) * 2018-05-31 2022-05-17 苏州佳世达光电有限公司 驱动电路
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101379887A (zh) * 2005-12-20 2009-03-04 Tir科技公司 控制提供到电子器件的电流的方法和装置
CN101527990A (zh) * 2008-03-04 2009-09-09 原景科技股份有限公司 发光二极管驱动电路
CN102469651A (zh) * 2010-11-11 2012-05-23 海洋王照明科技股份有限公司 一种led驱动电路及灯具
CN102479488A (zh) * 2010-11-23 2012-05-30 三星电子株式会社 发光二极管驱动电路和具有其的显示装置
CN102711307A (zh) * 2011-03-28 2012-10-03 海洋王照明科技股份有限公司 一种可调光led驱动电路及灯具
EP2573575A1 (en) * 2011-09-23 2013-03-27 Infineon Technologies AG Digital switching converter control

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7550934B1 (en) * 2008-04-02 2009-06-23 Micrel, Inc. LED driver with fast open circuit protection, short circuit compensation, and rapid brightness control response

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101379887A (zh) * 2005-12-20 2009-03-04 Tir科技公司 控制提供到电子器件的电流的方法和装置
CN101527990A (zh) * 2008-03-04 2009-09-09 原景科技股份有限公司 发光二极管驱动电路
CN102469651A (zh) * 2010-11-11 2012-05-23 海洋王照明科技股份有限公司 一种led驱动电路及灯具
CN102479488A (zh) * 2010-11-23 2012-05-30 三星电子株式会社 发光二极管驱动电路和具有其的显示装置
CN102711307A (zh) * 2011-03-28 2012-10-03 海洋王照明科技股份有限公司 一种可调光led驱动电路及灯具
EP2573575A1 (en) * 2011-09-23 2013-03-27 Infineon Technologies AG Digital switching converter control

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