WO2017166183A1 - 一种vr显示屏的背光电路 - Google Patents

一种vr显示屏的背光电路 Download PDF

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Publication number
WO2017166183A1
WO2017166183A1 PCT/CN2016/078024 CN2016078024W WO2017166183A1 WO 2017166183 A1 WO2017166183 A1 WO 2017166183A1 CN 2016078024 W CN2016078024 W CN 2016078024W WO 2017166183 A1 WO2017166183 A1 WO 2017166183A1
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Prior art keywords
backlight
led
led lamp
resistor
driving chip
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PCT/CN2016/078024
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English (en)
French (fr)
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李刚
张丰学
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深圳多哚新技术有限责任公司
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Priority to PCT/CN2016/078024 priority Critical patent/WO2017166183A1/zh
Publication of WO2017166183A1 publication Critical patent/WO2017166183A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof

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  • the present invention relates to the technical field of VR display, and in particular to a backlight circuit of a VR display screen.
  • the illumination of the LED lamp is proportional to the current, and the voltage is changing the current to change the illumination of the LED lamp. Then, there are some differences in the operating voltage of the different LED lamps. There is a difference in the brightness of the light.
  • this design is roughly to concentrate two or more independent constant current driving in one IC or MCU, using high precision AD port to feedback
  • the resistor performs voltage reading, and then the IC or MCU internally compares two or more feedback voltages to compare the line, and then adjusts the difference between the LED lamp-driven PWM signal.
  • the advantage of this scheme is more balanced than the previous two paths in current design. Electricity, that is, the brightness is relatively consistent, but the disadvantage is high cost and high requirements on the device.
  • an embodiment of the present invention provides a backlight circuit of a VR display screen.
  • the invention provides a backlight circuit of a VR display screen, comprising: a first backlight LED lamp group, a second backlight LED lamp group and an LED driving circuit;
  • the first backlight LED lamp group and the second backlight LED lamp group are connected in series;
  • the LED driving circuit is connected to the first backlight LED lamp group and the second backlight LED lamp group to provide a fixed working current or working voltage for the first backlight LED lamp group and the second backlight LED lamp group .
  • the two backlight LED lamp groups are connected in series and driven by the same LED driving circuit.
  • the working current of the two backlight LED lamp groups is consistent and constant.
  • the solution is simple and practical, and saves circuit components, and the circuit components are not required. , greatly reducing the production cost of VR equipment; although the program has certain defects, that is, there is a problem with the LED light of one display screen, the two backlight LED light groups can not display normally, but in the VR display backlight application, one If there is a problem with the display, it will not be able to view the image properly, so in the VR display backlight application, the defect is not a real defect.
  • the LED driving circuit comprises an LED driving chip, an inductor L1, a diode D8 and a resistor R1;
  • the sixth pin of the LED driving chip is connected with a DC power source, and is a power input pin of the LED driving chip;
  • the sixth pin of the LED driving chip is further connected to the first end of the inductor L1 and the fourth pin of the LED driving chip; the first pin of the LED driving chip is connected to the second end of the inductor L1; The third pin of the LED driving chip is connected to the first end of the resistor R1, and the second end of the resistor R1 is grounded;
  • the second end of the inductor L1 is also connected to the anode of the diode D8, and the cathode of the diode D8 is connected to the anode connection end of the first backlight LED lamp group; the cathode connection end of the first backlight LED lamp group is connected to the second backlight LED a positive terminal of the lamp group, a negative terminal of the second backlight LED lamp group is connected to the first end of the resistor R1;
  • the LED driving chip adopts a driving chip of the model AP3127B produced by Wuxi Xinpeng Microelectronics Co., Ltd.
  • the driving chip of the AP3127B is a step-up DC/DC converter of constant current output.
  • the LED driving circuit is a constant current driving circuit
  • the negative electrode of the diode D8 is a current output terminal, which provides constant for the two backlight LED lamp groups. Current output.
  • the LED driving circuit further includes a filter capacitor, and the filter capacitor includes a capacitor C1 and a capacitor C2;
  • the anode of the capacitor C1 is connected to the sixth pin of the LED driving chip, the cathode of the capacitor C1 is grounded, the anode of the capacitor C2 is connected to the cathode of the diode D8, and the cathode of the capacitor C2 is grounded.
  • the LED driving circuit comprises an LED driving chip, an inductor L1, a diode D8, a resistor R1, a resistor R2 and a resistor R3;
  • the sixth pin of the LED driving chip is connected with a DC power source, and is a power input pin of the LED driving chip;
  • the sixth pin of the LED driving chip is further connected to the first end of the inductor L1 and the fourth pin of the LED driving chip; the first pin of the LED driving chip is connected to the second end of the inductor L1;
  • the third pin of the LED driver chip is connected to the first end of the resistor R2, the second end of the resistor R2 is grounded; the first end of the resistor R2 is also connected to the second end of the resistor R3, and the first end of the resistor R3 is connected to the cathode of the diode D8 ;
  • the second end of the inductor L1 is also connected to the anode of the diode D8, and the cathode of the diode D8 is connected to the anode connection end of the first backlight LED lamp group; the cathode connection end of the first backlight LED lamp group is connected to the second backlight LED a positive terminal of the lamp group, a negative terminal of the second backlight LED lamp group is connected to the first end of the resistor R1; and a second end of the resistor R1 is grounded;
  • the LED driving chip adopts a driving chip of the model AP3127B produced by Wuxi Xinpeng Microelectronics Co., Ltd.
  • the LED driving circuit is a constant voltage driving circuit
  • the negative electrode of the diode D8 is a voltage output terminal, which provides constant for the two backlight LED lamp groups.
  • the inductor L1, the diode D8, the resistor R2 and the resistor R3 form a booster circuit; the output voltage is determined by the number of LED lamps of the two backlight LEDs; the resistor R1 is used to adjust the current of the LED lamp.
  • the two-way series LED backlight group after the working voltages at both ends are determined, the working current is determined, and the two LED backlights in series are identical, and the illuminating characteristics are also consistent.
  • the LED driving chip is a driving chip of the model AP3127B of Wuxi Xinpeng Microelectronics Co., Ltd.;
  • the LED driving circuit further includes a filter capacitor, the filter capacitor includes a capacitor C1 and a capacitor C2; a cathode of the capacitor C1 is connected to a sixth pin of the LED driver chip, a cathode of the capacitor C1 is grounded; and a cathode of the capacitor C2 is connected to a diode D8. The negative pole of the capacitor C2 is grounded.
  • the DC power source is a +5V DC power source.
  • the first backlight LED light group includes one or more LED lights; and the second backlight LED light group includes one or more LED lights.
  • the VR display screen comprises a first VR display screen and a second VR display screen;
  • the first backlight LED group is the backlight of the first VR display
  • the second backlight LED group is the backlight of the second VR display.
  • the diode D8 is a Zener diode.
  • the invention has the beneficial effects that the two backlight LED lamp groups are connected in series and driven by the same LED driving circuit, and the working currents of the two backlight LED lamp groups are consistent and constant, the scheme is simple and practical, and the circuit components are saved. The circuit component requirements are not high, which greatly reduces the production cost of the VR device.
  • FIG. 1 is a circuit schematic diagram of a backlight circuit of a VR display screen according to the present invention.
  • FIG. 2 is a circuit schematic diagram of another backlight circuit of the VR display screen of the present invention.
  • Embodiments of the present invention provide a backlight circuit of a VR display screen for implementing illumination consistency of two display screens of a VR display screen.
  • FIG. 1 is a circuit schematic diagram of a backlight circuit of a VR display screen according to the present invention.
  • +VCC is a DC power supply.
  • the backlight circuit specifically includes: a first backlight LED lamp group 10, a second backlight LED lamp group 20, and an LED driving circuit 30.
  • the power input terminal of the LED driving circuit 30 is connected to +VCC, and the first backlight LED lamp group 10 and the second backlight LED lamp group 20 are connected in series.
  • the current output terminal of the LED driving circuit 30 is connected to the positive input terminal of the first backlight LED lamp group 10, and the negative input terminal of the second backlight LED lamp group 20 is connected to the voltage feedback terminal of the LED driving circuit 30.
  • the LED driving circuit 30 includes an LED driving chip 31, an inductor L1, a diode D8, and a resistor R1.
  • the diode D8 is a Zener diode.
  • the LED driving chip 31 is a driving chip of the type AP3127B manufactured by Wuxi Xinpeng Microelectronics Co., Ltd.
  • the sixth pin of the LED driving chip 31 is connected to +VCC, which is a power input pin of the LED driving chip 31.
  • the sixth pin of the LED driving chip 31 is further connected to the first end of the inductor L1 and the fourth pin of the LED driving chip 31; the first pin of the LED driving chip 31 is connected to the second end of the inductor L1; the LED driving chip 31 is The third pin is connected to the first end of the resistor R1, the second end of the resistor R1 is grounded; the second end of the inductor L1 is also connected to the anode of the diode D8, and the cathode of the diode D8 is connected to the positive terminal of the first backlight LED lamp group 10; The negative terminal of the first backlight LED lamp group 10 is connected to the positive terminal of the second backlight LED lamp group 20, and the negative terminal of the second backlight LED lamp group 20 is connected to the first terminal of the resistor R1.
  • the first pin of the LED driving chip 31 is a current/voltage output pin
  • the second pin of the LED driving chip 31 is a power ground pin
  • the third pin of the LED driving chip 31 is a voltage feedback lead.
  • the fourth pin of the LED driver chip 31 enables the pin to be active high.
  • the fifth pin of the LED driver chip 31 is an overvoltage protection pin. In this embodiment, the pin is suspended and the LED is driven.
  • the sixth pin of chip 31 is a power input pin.
  • the LED driving circuit 30 further includes a filter capacitor, the filter capacitor includes a capacitor C1 and a capacitor C2; a cathode of the capacitor C1 is connected to a sixth pin of the LED driver chip 31, a cathode of the capacitor C1 is grounded; and a cathode of the capacitor C2 is connected to a diode.
  • the driving chip of the AP3127B is a step-up DC/DC converter with a constant current output.
  • the LED driving circuit is a constant current driving circuit
  • the negative electrode of the diode D8 is a current output terminal, which provides a constant current output for the two backlight LED lamp groups. .
  • FIG. 2 is a circuit schematic diagram of another backlight circuit of the VR display screen according to the present invention.
  • +VCC is a DC power supply.
  • the LED driving circuit 30 includes an LED driving chip 31, an inductor L1, a diode D8, a resistor R1, a resistor R2, and a resistor R3.
  • the LED driving chip 31 is a driving chip of the type AP3127B manufactured by Wuxi Xinpeng Microelectronics Co., Ltd.
  • the sixth pin of the LED driver chip 31 is connected to +VCC, which is a power input pin of the LED driver chip.
  • the sixth pin of the LED driving chip 31 is further connected to the first end of the inductor L1 and the fourth pin of the LED driving chip 31; the first pin of the LED driving chip 31 is connected to the second end of the inductor L1; the LED driving chip 31 is The third pin is connected to the first end of the resistor R2, the second end of the resistor R2 is grounded; the first end of the resistor R2 is also connected to the second end of the resistor R3, the first end of the resistor R3 is connected to the cathode of the diode D8; the inductor L1 is The second end is also connected to the anode of the diode D8, and the cathode of the diode D8 is connected to the anode connection end of the first backlight LED group 10; the cathode connection end of the first backlight LED group 10 is connected to the anode connection end of the second backlight LED group 20.
  • the negative terminal of the second backlight LED lamp group 20 is connected to the first end of the resistor R1; the
  • the driving chip of the AP3127B is a step-up DC/DC converter with a constant current output.
  • the LED driving circuit 30 is a constant voltage driving circuit
  • the negative electrode of the diode D8 is a voltage output terminal, which provides a constant for the two backlight LED lamp groups. Voltage output.
  • the inductor L1, the diode D8, the resistor R2 and the resistor R3 form a booster circuit; the output voltage is determined by the number of LED lamps of the two backlight LEDs; the resistor R1 is used to adjust the current of the LED lamp.
  • the two-way series LED backlight group after the working voltages at both ends are determined, the working current is determined, and the two LED backlights in series are identical, and the illuminating characteristics are also consistent.
  • the LED driving circuit 30 further includes a filter capacitor, the filter capacitor includes a capacitor C1 and a capacitor C2; the anode of the capacitor C1 is connected to the sixth pin of the LED driver chip 31, and the capacitor The negative pole of C1 is grounded; the anode of capacitor C2 is connected to the cathode of diode D8, and the cathode of capacitor C2 is grounded.
  • the filter capacitor includes a capacitor C1 and a capacitor C2; the anode of the capacitor C1 is connected to the sixth pin of the LED driver chip 31, and the capacitor The negative pole of C1 is grounded; the anode of capacitor C2 is connected to the cathode of diode D8, and the cathode of capacitor C2 is grounded.
  • the DC power source is preferably a +5 V DC power source.
  • the first backlight LED light group 10 includes one or more LED lights; the second backlight LED light group 10 includes one or more LED lights.
  • the number of LED lamps may be determined according to specific application scenarios, and should not be construed as limiting the present invention.
  • the parameters of the circuit components of the backlight circuit may be determined according to specific application scenarios, and should not be construed as limiting the invention.
  • the VR display includes a first VR display and a second VR display.
  • the VR display is usually a liquid crystal display.
  • the first backlight LED light group 10 is a backlight of the first VR display screen
  • the second backlight LED light group 20 is a backlight of the second VR display screen.

Abstract

提供一种虚拟现实（VR）显示屏的背光电路，用于实现VR显示屏的两个显示屏的发光一致性，该背光电路包括：第一背光发光二极管（LED）灯组（10）、第二背光LED灯组（20）以及LED驱动电路（30），所述第一背光LED灯组（10）和所述第二背光LED灯组（20）串联，所述LED驱动电路（30）连接所述第一背光LED灯组（10）和所述第二背光LED灯组（20），为所述第一背光LED灯组（10）和所述第二背光LED灯组（20）提供固定的工作电流或工作电压。该背光电路把两路背光LED灯组串联起来，采用同一个LED驱动电路（30）来驱动，两路背光LED灯组的工作电流一致且恒定，该方案简单实用，且节省了电路元件，对电路元件要求也不高，降低了VR设备的生产成本。

Description

一种VR显示屏的背光电路 技术领域
本发明涉及VR显示的技术领域，尤其涉及一种VR显示屏的背光电路。
背景技术
在当前快速发展的VR(Virtual Reality，虚拟现实)领域的头显设备中，都会用到两个LED显示屏，在两个LED屏的背光亮度方案中，一般有三种实现方案，即是两个独立恒压驱动、两个独立恒流驱动、两路或多路LED灯电流平衡电路设计。
对于第一个方案，即两个独立恒压驱动，LED灯的发光是与电流成正比关系，电压是改变电流从而改变LED灯的发光，那么，因不同LED灯的工作电压存在一些差异，LED的发光亮度就存在差异。
对于第二个方案，即两个独立恒流驱动，由于两个独立的恒流驱动，其恒流驱动上的所有器件，包括IC，电感，反馈电阻都存在误差，因此亮度很难一致性。
对于第三个方案，两路或多路LED灯电流均衡电路设计，此设计是大致就是把两个或多个独立的恒流驱动集中在一个IC或MCU里，利用高精度的AD口对反馈电阻进行电压读取，然后IC或MCU内部对两个或多个反馈电压比行比较，再去调整差异的那路LED灯驱动的PWM信号，本方案优点比前面两路在电流设计上比较均衡电,即亮度比较一致性比较高，但缺点是成本高，对器件要求高。
发明内容
有鉴于此，本发明实施例提供了一种VR显示屏的背光电路。
本发明采用以下技术方案：
本发明提供一种VR显示屏的背光电路，包括：第一背光LED灯组、第二背光LED灯组以及LED驱动电路；
所述第一背光LED灯组和所述第二背光LED灯组串联；
所述LED驱动电路连接所述第一背光LED灯组和所述第二背光LED灯组，为所述第一背光LED灯组和所述第二背光LED灯组提供固定的工作电流或工作电压。
把两路背光LED灯组串联起来，采用同一个LED驱动电路来驱动，两路背光LED灯组的工作电流一致且恒定，该方案简单实用，且节省了电路元件，对电路元件要求也不高，大大降低了VR设备的生产成本；虽然该方案存在一定的缺陷，即一个显示屏的LED灯出现问题，两路背光LED灯组都无法正常显示，但是在在VR显示屏背光应用中，一个显示屏若出现问题，其就已经无法正常观看图像，故在VR显示屏背光应用中，该缺陷也不是真的缺陷。
优选的，所述LED驱动电路包括LED驱动芯片、电感L1、二极管D8和电阻R1；
所述LED驱动芯片的第六引脚连接有直流电源，为所述LED驱动芯片的电源输入引脚；
所述LED驱动芯片的第六引脚还连接电感L1的第一端和所述LED驱动芯片的第四引脚；所述LED驱动芯片的第一引脚连接电感L1的第二端；所述LED驱动芯片的第三引脚连接电阻R1的第一端，电阻R1的第二端接地；
电感L1的第二端还连接二极管D8的正极，二极管D8的负极连接所述第一背光LED灯组的正极连接端；所述第一背光LED灯组的负极连接端连接所述第二背光LED灯组的正极连接端，所述第二背光LED灯组的负极连接端连接电阻R1的第一端；
其中，所述LED驱动芯片采用无锡芯朋微电子股份有限公司生产的型号为AP3127B的驱动芯片。
本发明中，AP3127B的驱动芯片是一款恒流输出的升压型DC/DC转换器。该实施例通过AP3127B的驱动芯片和相关电路元件进行如上的电连接后，所述LED驱动电路即为一恒流驱动电路，二极管D8的负极为电流输出端，为两路背光LED灯组提供恒定的电流输出。
优选的，所述LED驱动电路还包括滤波电容，所述滤波电容包括电容C1和电容C2；
电容C1的正极连接所述LED驱动芯片的第六引脚，电容C1的负极接地；电容C2的正极连接二极管D8的负极，电容C2的负极接地。
优选的，所述LED驱动电路包括LED驱动芯片、电感L1、二极管D8、电阻R1、电阻R2和电阻R3；
所述LED驱动芯片的第六引脚连接有直流电源，为所述LED驱动芯片的电源输入引脚；
所述LED驱动芯片的第六引脚还连接电感L1的第一端和所述LED驱动芯片的第四引脚；所述LED驱动芯片的第一引脚连接电感L1的第二端；所述LED驱动芯片的第三引脚连接电阻R2的第一端，电阻R2的第二端接地；电阻R2的第一端还连接电阻R3的第二端，电阻R3的第一端连接二极管D8的负极；
电感L1的第二端还连接二极管D8的正极，二极管D8的负极连接所述第一背光LED灯组的正极连接端；所述第一背光LED灯组的负极连接端连接所述第二背光LED灯组的正极连接端，所述第二背光LED灯组的负极连接端连接电阻R1的第一端；电阻R1的第二端接地；
其中，所述LED驱动芯片采用无锡芯朋微电子股份有限公司生产的型号为AP3127B的驱动芯片。
该实施例通过AP3127B的驱动芯片和相关电路元件进行如上的电连接后，所述LED驱动电路即为一恒压驱动电路，二极管D8的负极为电压输出端，为两路背光LED灯组提供恒定的电压输出。其中，电感L1、二极管D8、电阻R2和电阻R3组成一个升压电路；输出电压的选取由两路背光LED灯组的LED灯个数决定；电阻R1用于调整LED灯的电流。对于两路串联的背光LED灯组，两端的工作电压确定后，工作电流随之确定，且两路串联的背光LED灯组为一致，发光特性也一致。
优选的，所述LED驱动芯片为无锡芯朋微电子股份有限公司的型号为AP3127B的驱动芯片；
所述LED驱动电路还包括滤波电容，所述滤波电容包括电容C1和电容C2；电容C1的正极连接所述LED驱动芯片的第六引脚，电容C1的负极接地；电容C2的正极连接二极管D8的负极，电容C2的负极接地。
优选的，所述直流电源为+5V直流电源。
优选的，所述第一背光LED灯组包括一个或多个LED灯；所述第二背光LED灯组包括一个或多个LED灯。
优选的，VR显示屏包括第一VR显示屏和第二VR显示屏；
第一背光LED灯组为第一VR显示屏的背光源，第二背光LED灯组为第二VR显示屏的背光源。
优选的，二极管D8为稳压二极管。
本发明的有益效果：把两路背光LED灯组串联起来，采用同一个LED驱动电路来驱动，两路背光LED灯组的工作电流一致且恒定，该方案简单实用，且节省了电路元件，对电路元件要求也不高，大大降低了VR设备的生产成本。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其它的附图。
图1是本发明所述的VR显示屏的一种背光电路的电路原理图。
图2是本发明所述的VR显示屏的另一种背光电路的电路原理图。
图中：
10、第一背光LED灯组；20、第二背光LED灯组；30、LED驱动电路；31、LED驱动芯片。
具体实施方式
本发明实施例提供了一种VR显示屏的背光电路，用于实现VR显示屏的两个显示屏的发光一致性。
为使得本发明的发明目的、特征、优点能够更加的明显和易懂，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，下面所描述的实施例仅仅是本发明一部分实施例，而非全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实施例，都属于本发明保护的范围。
下面结合附图并通过具体实施方式来进一步说明本发明的技术方案。
请参考图1，图1是本发明所述的VR显示屏的一种背光电路的电路原理图。图中，+VCC为直流电源。
该背光电路具体包括：第一背光LED灯组10、第二背光LED灯组20和LED驱动电路30。
LED驱动电路30的电源输入端连接+VCC，第一背光LED灯组10和第二背光LED灯组20串联。
LED驱动电路30的电流输出端连接第一背光LED灯组10的正极输入端，第二背光LED灯组20的负极输入端连接LED驱动电路30的电压反馈端。
具体的，LED驱动电路30包括LED驱动芯片31、电感L1、二极管D8和电阻R1。其中，二极管D8为稳压二极管。
本实施例中，LED驱动芯片31采用无锡芯朋微电子股份有限公司生产的型号为AP3127B的驱动芯片。LED驱动芯片31的第六引脚连接+VCC，为LED驱动芯片31的电源输入引脚。
LED驱动芯片31的第六引脚还连接电感L1的第一端和LED驱动芯片31的第四引脚；LED驱动芯片31的第一引脚连接电感L1的第二端；LED驱动芯片31的第三引脚连接电阻R1的第一端，电阻R1的第二端接地；电感L1的第二端还连接二极管D8的正极，二极管D8的负极连接第一背光LED灯组10的正极连接端；第一背光LED灯组10的负极连接端连接第二背光LED灯组20的正极连接端，第二背光LED灯组20的负极连接端连接电阻R1的第一端。
本实施例中，LED驱动芯片31的第一引脚为电流/电压输出引脚，LED驱动芯片31的第二引脚为电源地引脚，LED驱动芯片31的第三引脚为电压反馈引脚，LED驱动芯片31的第四引脚位芯片使能引脚，高电平有效，LED驱动芯片31的第五引脚为过压保护引脚，本实施例中本引脚悬空，LED驱动芯片31的第六引脚为电源输入引脚。
具体的，LED驱动电路30还包括滤波电容，所述滤波电容包括电容C1和电容C2；电容C1的正极连接LED驱动芯片31的第六引脚，电容C1的负极接地；电容C2的正极连接二极管D8的负极，电容C2的负极接 地。
本实施例中，AP3127B的驱动芯片是一款恒流输出的升压型DC/DC转换器。通过AP3127B的驱动芯片和相关电路元件进行如上的电连接后，所述LED驱动电路即为一恒流驱动电路，二极管D8的负极为电流输出端，为两路背光LED灯组提供恒定的电流输出。
请参考图2，图2是本发明所述的VR显示屏的另一种背光电路的电路原理图。图中，+VCC为直流电源。
LED驱动电路30包括LED驱动芯片31、电感L1、二极管D8、电阻R1、电阻R2和电阻R3。
本实施例中，LED驱动芯片31采用无锡芯朋微电子股份有限公司生产的型号为AP3127B的驱动芯片。LED驱动芯片31的第六引脚连接+VCC，为所述LED驱动芯片的电源输入引脚。
LED驱动芯片31的第六引脚还连接电感L1的第一端和LED驱动芯片31的第四引脚；LED驱动芯片31的第一引脚连接电感L1的第二端；LED驱动芯片31的第三引脚连接电阻R2的第一端，电阻R2的第二端接地；电阻R2的第一端还连接电阻R3的第二端，电阻R3的第一端连接二极管D8的负极；电感L1的第二端还连接二极管D8的正极，二极管D8的负极连接第一背光LED灯组10的正极连接端；第一背光LED灯组10的负极连接端连接第二背光LED灯组20的正极连接端，第二背光LED灯组20的负极连接端连接电阻R1的第一端；电阻R1的第二端接地。
本实施例中，AP3127B的驱动芯片是一款恒流输出的升压型DC/DC转换器。该实施例通过AP3127B的驱动芯片和相关电路元件进行如上的电连接后，LED驱动电路30即为一恒压驱动电路，二极管D8的负极为电压输出端，为两路背光LED灯组提供恒定的电压输出。其中，电感L1、二极管D8、电阻R2和电阻R3组成一个升压电路；输出电压的选取由两路背光LED灯组的LED灯个数决定；电阻R1用于调整LED灯的电流。对于两路串联的背光LED灯组，两端的工作电压确定后，工作电流随之确定，且两路串联的背光LED灯组为一致，发光特性也一致。
具体的，LED驱动电路30还包括滤波电容，所述滤波电容包括电容C1和电容C2；电容C1的正极连接LED驱动芯片31的第六引脚，电容 C1的负极接地；电容C2的正极连接二极管D8的负极，电容C2的负极接地。
本实施例中，所述直流电源优选为+5V直流电源。
本实施例中，第一背光LED灯组10包括一个或多个LED灯；第二背光LED灯组10包括一个或多个LED灯。
需要说明的是，LED灯的数量可根据具体的应用场景而定，其不应理解为对本发明的限定。同理，背光电路的电路元件的参数可根据具体的应用场景而定，其不应理解为对本发明的限定。
为便于理解，VR显示屏包括第一VR显示屏和第二VR显示屏。VR显示屏一般为液晶显示屏。第一背光LED灯组10为第一VR显示屏的背光源，第二背光LED灯组20为第二VR显示屏的背光源。
以上所述，以上实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的精神和范围。

Claims (9)

  1. 一种VR显示屏的背光电路，其特征在于，包括：第一背光LED灯组、第二背光LED灯组以及LED驱动电路；
    所述第一背光LED灯组和所述第二背光LED灯组串联；
    所述LED驱动电路连接所述第一背光LED灯组和所述第二背光LED灯组，为所述第一背光LED灯组和所述第二背光LED灯组提供固定的工作电流或工作电压。
  2. 根据权利要求1所述的背光电路，其特征在于，所述LED驱动电路包括LED驱动芯片、电感L1、二极管D8和电阻R1；
    所述LED驱动芯片的第六引脚连接有直流电源，为所述LED驱动芯片的电源输入引脚；
    所述LED驱动芯片的第六引脚还连接电感L1的第一端和所述LED驱动芯片的第四引脚；所述LED驱动芯片的第一引脚连接电感L1的第二端；所述LED驱动芯片的第三引脚连接电阻R1的第一端，电阻R1的第二端接地；
    电感L1的第二端还连接二极管D8的正极，二极管D8的负极连接所述第一背光LED灯组的正极连接端；所述第一背光LED灯组的负极连接端连接所述第二背光LED灯组的正极连接端，所述第二背光LED灯组的负极连接端连接电阻R1的第一端；
    其中，所述LED驱动芯片采用无锡芯朋微电子股份有限公司生产的型号为AP3127B的驱动芯片。
  3. 根据权利要求2所述的背光电路，其特征在于，所述LED驱动电路还包括滤波电容，所述滤波电容包括电容C1和电容C2；
    电容C1的正极连接所述LED驱动芯片的第六引脚，电容C1的负极接地；电容C2的正极连接二极管D8的负极，电容C2的负极接地。
  4. 根据权利要求1所述的背光电路，其特征在于，所述LED驱动电路包括LED驱动芯片、电感L1、二极管D8、电阻R1、电阻R2和电阻R3；
    所述LED驱动芯片的第六引脚连接有直流电源，为所述LED驱动芯 片的电源输入引脚；
    所述LED驱动芯片的第六引脚还连接电感L1的第一端和所述LED驱动芯片的第四引脚；所述LED驱动芯片的第一引脚连接电感L1的第二端；所述LED驱动芯片的第三引脚连接电阻R2的第一端，电阻R2的第二端接地；电阻R2的第一端还连接电阻R3的第二端，电阻R3的第一端连接二极管D8的负极；
    电感L1的第二端还连接二极管D8的正极，二极管D8的负极连接所述第一背光LED灯组的正极连接端；所述第一背光LED灯组的负极连接端连接所述第二背光LED灯组的正极连接端，所述第二背光LED灯组的负极连接端连接电阻R1的第一端；电阻R1的第二端接地；
    其中，所述LED驱动芯片采用无锡芯朋微电子股份有限公司生产的型号为AP3127B的驱动芯片。
  5. 根据权利要求4所述的背光电路，其特征在于，所述LED驱动电路还包括滤波电容，所述滤波电容包括电容C1和电容C2；电容C1的正极连接所述LED驱动芯片的第六引脚，电容C1的负极接地；电容C2的正极连接二极管D8的负极，电容C2的负极接地。
  6. 根据权利要求2所述的背光电路，其特征在于，所述直流电源为+5V直流电源。
  7. 根据权利要求1所述的背光电路，其特征在于，所述第一背光LED灯组包括一个或多个LED灯；所述第二背光LED灯组包括一个或多个LED灯。
  8. 根据权利要求1所述的背光电路，其特征在于，VR显示屏包括第一VR显示屏和第二VR显示屏；
    第一背光LED灯组为第一VR显示屏的背光源，第二背光LED灯组为第二VR显示屏的背光源。
  9. 根据权利要求2至6中任意一项所述的背光电路，其特征在于，二极管D8为稳压二极管。
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