WO2019242309A1 - 具有阅读灯的电子阅读器 - Google Patents

具有阅读灯的电子阅读器 Download PDF

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Publication number
WO2019242309A1
WO2019242309A1 PCT/CN2019/073501 CN2019073501W WO2019242309A1 WO 2019242309 A1 WO2019242309 A1 WO 2019242309A1 CN 2019073501 W CN2019073501 W CN 2019073501W WO 2019242309 A1 WO2019242309 A1 WO 2019242309A1
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light source
source group
pin
register
reading lamp
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PCT/CN2019/073501
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English (en)
French (fr)
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程超
李超军
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掌阅科技股份有限公司
深圳市掌阅科技有限公司
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Publication of WO2019242309A1 publication Critical patent/WO2019242309A1/zh

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    • 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
    • H05B44/00—Circuit arrangements for operating electroluminescent light sources

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  • the present disclosure relates to an electronic reader, and more particularly, to an electronic reader having a reading lamp.
  • some e-readers are equipped with reading lights, such as a front-lighting reading lamp with a light source integrated inside the e-reader.
  • the light on the display of the reading lamp is usually monotonous white.
  • An electronic reader with a reading lamp includes: a reading lamp, including a first light source group and a second light source group, each of the first light source group and the second light source group includes at least one light source, and the light source of the second light source group is light-emitting Provide a color temperature different from that when the light source of the first light source group emits light;
  • the light source driving module includes a first communication pin, a first light source group pin connected to the first light source group, and a second light source group pin connected to the second light source group ;
  • the second communication pin is connected to the first A
  • control module communicates with the light source driving module through an I 2 C bus.
  • the first communication pin and the second communication pin are serial data interfaces.
  • the light source driving module further includes a first serial clock interface for controlling.
  • the module further includes a second serial clock interface, and the first serial clock interface is connected to the second serial clock interface.
  • control module further includes a third register and a fourth register.
  • the third register is used to store the first power information for controlling the power of the first light source group
  • the fourth register is used to store the power for controlling the power of the second light source group. Second power information.
  • control module further includes a pulse width modulation signal generating unit and a PWM transmitting pin.
  • the light source driving module includes a PWM receiving pin.
  • the pulse width modulation signal generating unit is configured to generate a PWM signal and send it to the PWM through the PWM transmitting pin.
  • the receiving pin, the light source driving module assists in controlling the brightness of the first light source group and the second light source group according to the PWM signal.
  • the first light source group pin is connected to the negative terminal of the first light source group
  • the second light source group pin is connected to the negative terminal of the second light source group
  • the light source driving module further includes an overvoltage protection unit and overvoltage protection. Pin, the overvoltage protection pin is connected to the positive terminal of the first light source group and the positive terminal of the second light source group.
  • the first light source group and the second light source group are both LED light strings.
  • the first register and the second register both store 256 levels of brightness information.
  • the model of the light source driving module is LM3630A.
  • the reading light is a front light type reading light.
  • the input module includes a touch panel.
  • the above-mentioned electronic reader with a reading lamp includes a first light source group and a second light source group.
  • the first light source group adopts a different color temperature from the second light source group.
  • the electronic reader independently adjusts the brightness of the first light source group through the first register.
  • the second register independently adjusts the brightness of the second light source group, so that it can provide illumination with different color temperatures to meet different needs of users.
  • FIG. 1 is a schematic diagram of a setting position of a reading lamp in an embodiment
  • FIG. 2 is a block diagram of a reading lamp-related circuit in an electronic reader having a reading lamp according to an embodiment
  • Fig. 3 is a circuit principle diagram of a reading lamp related circuit in an electronic reader having a reading lamp in an embodiment.
  • FIG. 2 is a block diagram of a reading lamp related circuit in an electronic reader having a reading lamp according to an embodiment, including a first light source group 12, a second light source group 14, a light source driving module 20, an input module 30, and a control module 40.
  • the reading lamp includes a first light source group 12 and a second light source group 14, wherein the first light source group 12 and the second light source group 14 each include at least one light source, and the light source of the second light source group 14 When emitting light, a color temperature different from that when the light sources of the first light source group 12 emit light is provided.
  • the first light source group 12 and the second light source group 14 each use a plurality of light emitting diodes (LEDs) as the light source.
  • the first light source group 12 includes a plurality of LEDs connected in series
  • the second light source group 14 also includes a plurality of LEDs. LEDs in series.
  • the light source driving module 20 includes a first communication pin connected to the second communication pin of the control module 40, a first light source group pin connected to the first light source group 12, and a second light source group pin connected to the second light source group 14.
  • the input module 30 converts the user's input into an input signal.
  • the input module 30 may include input devices known in the art, such as keys, keyboards, touch panels, and the like.
  • the control module 40 is connected to the input module 30 and includes a second communication pin, a first register 41 and a second register 43.
  • the second communication pin is connected to the first communication pin of the light source driving module 20.
  • the first register 41 is used to store the first brightness information
  • the second register 43 is used to store the second brightness information.
  • the user can adjust the brightness and color temperature of the reading lamp through the input module 30.
  • the input module 30 converts the user's adjustment operation into a reading lamp adjustment signal, and the control module 40 adjusts the first brightness information and the first stored in the first register 41 according to the reading lamp adjustment signal. At least one of the second brightness information stored in the two registers 43.
  • control module 40 determines whether it is only necessary to adjust the brightness of the first light source group 12, only the brightness of the second light source group 14, or whether the first light source group 12 and the second light source group 14 need to be adjusted at the same time according to the user's input. And then adjust at least one of the first brightness information stored in the first register 41 and the second brightness information stored in the second register 43 accordingly.
  • the control module 40 sends the first brightness information and the second brightness information to the first communication pin through the second communication pin, and the light source driving module 20 adjusts the brightness of the first light source group 12 according to the first brightness information, and according to the second brightness information The brightness of the second light source group 14 is adjusted.
  • the control module 40 may store the first brightness information and the second brightness information corresponding to each reading light adjustment signal in advance, and when the user performs an adjustment operation through the input module 30, directly call the pre-stored first brightness corresponding to the current reading light adjustment signal. Information and the second brightness information to refresh the first register 41 and the second register 43.
  • the above-mentioned electronic reader with a reading lamp includes a first light source group 12 and a second light source group 14.
  • the first light source group 12 adopts a color temperature different from that of the second light source group 14.
  • the user inputs a reading light adjustment signal through the input module 30, and the control module 40 adjusts the first brightness information stored in the first register 41 and the second brightness information stored in the second register 43 according to the adjustment signal, and combines the first brightness information and the second
  • the brightness information is sent to the light source driving module 20, and the brightness of the first light source group 12 and the second light source group 14 is adjusted by the light source driving module 20, so that different colors of light can be provided to meet different needs of users.
  • the first register 41 stores an 8-bit data (or address, instruction), so that the 256-level brightness adjustment of the first light source group 12 can be achieved.
  • the second register 43 also stores an 8-bit data (or address, instruction), and realizes 256-level brightness adjustment of the second light source group 14.
  • control module 40 further includes a third register and a fourth register.
  • the third register is used to store the first power information that controls the power of the first light source group 12
  • the fourth register 14 is used to store the second power information that controls the power of the second light source group 14.
  • the first power information and the second power information may be data, pointers, or addresses, and the power consumption of the first light source group 12 and the second light source group 14 is controlled by the first power information and the second power information.
  • the light source driving module adopts an LED driver U6 of Texas Instruments (TI) model LM3630A.
  • the first light source group is light emitting diodes D9 to D15 connected in series
  • the second light source group is light emitting diodes D1 to D8 connected in series. Understandably, in other embodiments, the first light source group and the second light source group may also use other numbers of LEDs.
  • the LED driver U6 further includes an overvoltage protection pin OVP and an overvoltage protection unit.
  • the overvoltage protection pin OVP is connected to the positive terminal of the first light source group and the positive terminal of the second light source group ( In the embodiment shown in FIG. 3, the first light source group and the second light source group share one positive terminal LED).
  • the pin ILED1 of the first light source group is connected to the negative LEDA of the first light source group, and the pin ILED2 of the second light source group is connected to the negative LEDB of the second light source group.
  • the control module 40 (not shown in FIG. 3) communicates with the LED driver U6 through the I2C bus, wherein the first communication pin is a serial data interface SDA.
  • the LED driver U6 further includes a serial clock interface SCL of the I2C bus, which is connected to the serial clock interface of the control module 40.
  • FIG. 3 does not show the control module 40, which may adopt a processing device such as a CPU, MCU, and single-chip microcomputer, which are well known in the art.
  • the control module 40 includes a Freescale processor IMX6SL.
  • the LED driver U6 further includes a PWM receiving pin PWM, and the LED driver U6 assists in controlling the brightness of the first light source group and the second light source group according to the PWM signal received by the PWM receiving pin PWM.
  • the control module 40 further includes a pulse width modulation signal generating unit and a PWM transmitting pin. The pulse width modulation signal generating unit is used to generate a PWM signal, and sends it to the PWM receiving pin PWM through the PWM transmitting pin.
  • test points can also be set, that is, a test point connected to the negative LEDA of the first light source group, a test point connected to the negative LEDB of the second light source group, and a test connected to the positive LED. Points, test points can be used to detect electrical parameters such as voltage and current of the first light source group and the second light source group.
  • the LED driver U6 further includes a switch pin SW.
  • the switch pin SW is connected to an internal electronic switch. In this embodiment, it is connected to the drain of an N-channel field effect transistor.
  • the switch pin SW is usually externally connected with a diode (anode) and an inductor, and the diode and the inductor are disposed near the switch pin SW.
  • the LED driver U6 further includes a working power input pin IN.
  • the LED driver U6 further includes an interrupt pin INTN, which is interrupted when an interrupt signal is received, and is generally used to change the fault state.
  • the LED driver U6 further includes an enable pin HWEN, which is enabled when a logic high level signal is received.
  • the LED driver U6 further includes an I2C address selection pin SEL.
  • the reading light is a front light type reading light.
  • the light source 112 of the first light source group and the light source 114 of the second light source group are spaced apart from each other, and both are disposed on the bottom side of the electronic reader (that is, when designed to be held by a user). Facing down).
  • the light guide layer 120 (which may be a light guide plate or a light guide film) is disposed on the sides of the first light source group and the second light source group.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

本公开涉及一种具有阅读灯的电子阅读器，包括：阅读灯，包括第一光源组和第二光源组，第一光源组和第二光源组均包括至少一个光源，第二光源组的光源在发光时提供和第一光源组的光源发光时不同的色温；光源驱动模块，包括连接第一光源组的第一光源组引脚及连接第二光源组的第二光源组引脚；输入模块，用于获取输入信号；及控制模块，连接输入模块，控制模块包括第一寄存器及第二寄存器，第一寄存器用于存储第一亮度信息，第二寄存器用于存储第二亮度信息。

Description

具有阅读灯的电子阅读器
相关申请的交叉参考
本申请要求于2018年6月19日提交中国专利局、申请号为201820946827.5、名称为“具有阅读灯的电子阅读器”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本公开涉及电子阅读器，特别是涉及一种具有阅读灯的电子阅读器。
背景技术
为了便于用户在昏暗的条件下阅读，部分电子阅读器配备了阅读灯，例如将光源集成在电子阅读器内部的前光式阅读灯。传统的电子阅读器，配备的阅读灯在显示屏上的光照通常为单调的白色。
发明内容
基于此，有必要提供一种具有阅读灯的电子阅读器，其能够提供不同色温的光照。
一种具有阅读灯的电子阅读器，包括：阅读灯，包括第一光源组和第二光源组，第一光源组和第二光源组均包括至少一个光源，第二光源组的光源在发光时提供和第一光源组的光源发光时不同的色温；光源驱动模块，包括第一通信引脚、连接第一光源组的第一光源组引脚及连接第二光源组的第二光源组引脚；输入模块，用于获取输入信号；及控制模块，连接输入模块，控制模块包括第二通信引脚、第一寄存器及第二寄存器，第一寄存器用于存储第一亮度信息，第二寄存器用于存储第二亮度信息，控制模块用于在输入信号中包含阅读灯调节信号时，根据阅读灯调节信号调整第一亮度信息和第二亮度信息中的至少一个；第二通信引脚连接第一通信引脚，用于将第一亮度信息和第二亮度信息发送给第一通信引脚，使得光源驱动模块根据第一亮度信息调节第一光源组的亮度、根据第二亮度信息调节第二光源组的亮度。
在其中一个实施例中，控制模块通过I 2C总线与光源驱动模块通信，第一 通信引脚和第二通信引脚是串行数据接口，光源驱动模块还包括第一串行时钟接口，控制模块还包括第二串行时钟接口，第一串行时钟接口连接第二串行时钟接口。
在其中一个实施例中，控制模块还包括第三寄存器和第四寄存器，第三寄存器用于存储控制第一光源组功率的第一功率信息，第四寄存器用于存储控制第二光源组功率的第二功率信息。
在其中一个实施例中，控制模块还包括脉冲宽度调制信号发生单元和PWM发送脚，光源驱动模块包括PWM接收脚，脉冲宽度调制信号发生单元用于产生PWM信号，并通过PWM发送脚发送给PWM接收脚，光源驱动模块根据PWM信号辅助控制第一光源组和第二光源组的亮度。
在其中一个实施例中，第一光源组引脚连接第一光源组的负极端，第二光源组引脚连接第二光源组的负极端，光源驱动模块还包括过压保护单元和过压保护引脚，过压保护引脚连接第一光源组的正极端和第二光源组的正极端。
在其中一个实施例中，第一光源组和第二光源组均为LED灯串。
在其中一个实施例中，第一寄存器和第二寄存器存储的均是256级的亮度信息。
在其中一个实施例中，光源驱动模块的型号为LM3630A。
在其中一个实施例中，阅读灯为前光式阅读灯。
在其中一个实施例中，输入模块包括触控面板。
上述具有阅读灯的电子阅读器，包括第一光源组和第二光源组，第一光源组采用与第二光源组不同的色温，电子阅读器通过第一寄存器独立调节第一光源组的亮度、通过第二寄存器独立调节第二光源组的亮度，从而可以提供不同色温的光照，满足用户的不同需求。
附图概述
图1是一实施例中阅读灯的设置位置示意图；
图2是一实施例中具有阅读灯的电子阅读器中阅读灯相关电路的框图；
图3是一实施例中具有阅读灯的电子阅读器中阅读灯相关电路的电路原 理图。
本公开的较佳实施方式
为了使本公开的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本公开进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本公开，并不用于限定本公开。
除非另有定义，本文所使用的所有的技术和科学术语与属于本公开的技术领域的技术人员通常理解的含义相同。本文中在本公开的说明书中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本公开。本文所使用的术语“及/或”包括一个或多个相关的所列项目的任意的和所有的组合。
需要说明的是，当元件被称为“固定于”另一个元件，它可以直接在另一个元件上或者也可以存在居中的元件。当一个元件被认为是“连接”另一个元件，它可以是直接连接到另一个元件或者可能同时存在居中元件。本文所使用的术语“垂直的”、“水平的”、“上”、“下”、“左”、“右”、以及类似的表述只是为了说明的目的。
图2是一实施例中具有阅读灯的电子阅读器中阅读灯相关电路的框图，包括第一光源组12、第二光源组14、光源驱动模块20、输入模块30及控制模块40。
在图2所示的实施例中，阅读灯包括第一光源组12和第二光源组14，其中第一光源组12和第二光源组14均包括至少一个光源，第二光源组14的光源在发光时提供和第一光源组12的光源发光时不同的色温。在一个实施例中，第一光源组12和第二光源组14均采用多个发光二极管(LED)作为光源，其中第一光源组12包括多个串联的LED，第二光源组14也包括多个串联的LED。
光源驱动模块20包括连接控制模块40第二通信引脚的第一通信引脚、连接第一光源组12的第一光源组引脚及连接第二光源组14的第二光源组引脚。
用户通过输入模块30进行输入，输入模块30将用户的输入转化成输入 信号。输入模块30可以包括本领域习知的输入设备，例如按键、键盘、触控面板等。
控制模块40连接输入模块30，包括第二通信引脚、第一寄存器41及第二寄存器43。其中第二通信引脚连接光源驱动模块20的第一通信引脚，第一寄存器41用于存储第一亮度信息，第二寄存器43用于存储第二亮度信息。用户可以通过输入模块30调节阅读灯的亮度和色温，输入模块30将用户的调节操作转化成阅读灯调节信号，控制模块40根据阅读灯调节信号调整第一寄存器41存储的第一亮度信息和第二寄存器43存储的第二亮度信息中的至少一个。具体地，控制模块40根据用户的输入，判断是只需要调节第一光源组12的亮度、只需要调节第二光源组14的亮度、还是需要同时调节第一光源组12和第二光源组14的亮度，然后相应调整第一寄存器41存储的第一亮度信息和第二寄存器43存储的第二亮度信息中的至少一个。控制模块40通过第二通信引脚将第一亮度信息和第二亮度信息发送给第一通信引脚，光源驱动模块20根据第一亮度信息调节第一光源组12的亮度，根据第二亮度信息调节第二光源组14的亮度。控制模块40可以预先存储与各阅读灯调节信号对应的第一亮度信息和第二亮度信息，在用户通过输入模块30进行调节操作时，直接调用预存的与当前阅读灯调节信号对应的第一亮度信息和第二亮度信息，来刷新第一寄存器41和第二寄存器43。
上述具有阅读灯的电子阅读器，包括第一光源组12和第二光源组14，第一光源组12采用与第二光源组14不同的色温。用户通过输入模块30输入阅读灯调节信号，控制模块40根据该调节信号调整第一寄存器41存储的第一亮度信息和第二寄存器43存储的第二亮度信息，并将第一亮度信息和第二亮度信息发送给光源驱动模块20，由光源驱动模块20调节第一光源组12和第二光源组14的亮度，从而可以提供不同色温的光照，满足用户的不同需求。
在一个实施例中，第一寄存器41存储的是一个8位的数据(或地址、指令)，从而可以实现对第一光源组12的256级的亮度调节。同理，第二寄存器43存储的也是一个8位的数据(或地址、指令)，实现对第二光源组14的256级的亮度调节。
在一个实施例中，控制模块40还包括第三寄存器和第四寄存器。其中第 三寄存器用于存储控制第一光源组12功率的第一功率信息，第四寄存器14用于存储控制第二光源组14功率的第二功率信息。第一功率信息和第二功率信息可以是数据、指针或地址，通过第一功率信息和第二功率信息控制第一光源组12和第二光源组14的功耗。
图3是一实施例中具有阅读灯的电子阅读器中阅读灯相关电路的电路原理图，该图中导线相交处画有小圆表示导线相交、否则不相交。在图3所示的实施例中，光源驱动模块采用德州仪器(TI)型号为LM3630A的LED驱动器U6。第一光源组为串联连接的发光二极管D9～D15，第二光源组为串联连接的发光二极管D1～D8。可以理解地，在其他实施例中，第一光源组和第二光源组也可以采用其他数量的LED。
在图3所示的实施例中，LED驱动器U6还包括过压保护引脚OVP和过压保护单元，过压保护引脚OVP连接第一光源组的正极端和第二光源组的正极端(在图3所示实施例中第一光源组和第二光源组共用一个正极端LED)。第一光源组引脚ILED1连接第一光源组的负极端LEDA，第二光源组引脚ILED2连接第二光源组的负极端LEDB。
在图3所示的实施例中，控制模块40(图3未示)通过I2C总线与LED驱动器U6通信，其中第一通信引脚为串行数据接口SDA。LED驱动器U6还包括I2C总线的串行时钟接口SCL，其连接控制模块40的串行时钟接口。
图3没有示出控制模块40，其可以采用本领域公知的CPU、MCU、单片机等处理设备。在一个实施例中，控制模块40包括飞思卡尔型号为IMX6SL的处理器。
在图3所示的实施例中，LED驱动器U6还包括PWM接收脚PWM，LED驱动器U6根据PWM接收脚PWM接收的PWM信号，辅助控制第一光源组和第二光源组的亮度。控制模块40还包括脉冲宽度调制信号发生单元和PWM发送脚，脉冲宽度调制信号发生单元用于产生PWM信号，并通过PWM发送脚发送给PWM接收脚PWM。
在一个实施例中，还可以设置三个测试点，即一个连接第一光源组的负极端LEDA的测试点、一个连接第二光源组的负极端LEDB的测试点、一个连接正极端LED的测试点，测试点可以用于检测第一光源组和第二光源组的 电压、电流等电参数。
在图3所示的实施例中，LED驱动器U6还包括开关脚SW。开关脚SW连接内部的电子开关，在本实施例中是连接N沟道场效应管的漏极。开关脚SW通常外接二极管(的阳极)和电感，该二极管和电感靠近开关脚SW设置。
在图3所示的实施例中，LED驱动器U6还包括工作电源输入脚IN。
在图3所示的实施例中，LED驱动器U6还包括中断脚INTN，在收到中断信号时中断，一般用于故障状态更改。
在图3所示的实施例中，LED驱动器U6还包括使能脚HWEN，在接收到逻辑高电平信号时使能。
在图3所示的实施例中，LED驱动器U6还包括I2C地址选择脚SEL。
在一个实施例中，阅读灯为前光式阅读灯。参见图1，在图1所示的实施例中，第一光源组的光源112和第二光源组的光源114间隔设置，且均设于电子阅读器的底侧(即设计成用户握持时朝下的一侧)。导光层120(可以为导光板或导光膜)设于第一光源组和第二光源组侧面。
以上所述实施例的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施例中的各个技术特征所有可能的组合都进行描述，然而，只要这些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。
以上所述实施例仅表达了本公开的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对公开专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本公开构思的前提下，还可以做出若干变形和改进，这些都属于本公开的保护范围。因此，本公开专利的保护范围应以所附权利要求为准。

Claims (10)

  1. 一种具有阅读灯的电子阅读器，其特征在于，包括：
    阅读灯，包括第一光源组和第二光源组，所述第一光源组和第二光源组均包括至少一个光源，所述第二光源组的光源在发光时提供和所述第一光源组的光源发光时不同的色温；
    光源驱动模块，包括第一通信引脚、连接所述第一光源组的第一光源组引脚及连接所述第二光源组的第二光源组引脚；
    输入模块，用于获取输入信号；及
    控制模块，连接所述输入模块，所述控制模块包括第二通信引脚、第一寄存器及第二寄存器，所述第一寄存器用于存储第一亮度信息，所述第二寄存器用于存储第二亮度信息，所述控制模块用于在所述输入信号中包含阅读灯调节信号时，根据所述阅读灯调节信号调整所述第一亮度信息和第二亮度信息中的至少一个；所述第二通信引脚连接所述第一通信引脚，用于将所述第一亮度信息和第二亮度信息发送给所述第一通信引脚，使得所述光源驱动模块根据所述第一亮度信息调节所述第一光源组的亮度、根据所述第二亮度信息调节所述第二光源组的亮度。
  2. 根据权利要求1所述的具有阅读灯的电子阅读器，其特征在于，所述控制模块通过I 2C总线与光源驱动模块通信，所述第一通信引脚和第二通信引脚是串行数据接口，所述光源驱动模块还包括第一串行时钟接口，所述控制模块还包括第二串行时钟接口，所述第一串行时钟接口连接所述第二串行时钟接口。
  3. 根据权利要求1所述的具有阅读灯的电子阅读器，其特征在于，所述控制模块还包括第三寄存器和第四寄存器，所述第三寄存器用于存储控制所述第一光源组功率的第一功率信息，所述第四寄存器用于存储控制所述第二光源组功率的第二功率信息。
  4. 根据权利要求1所述的具有阅读灯的电子阅读器，其特征在于，所述控制模块还包括脉冲宽度调制信号发生单元和PWM发送脚，所述光源驱动模块包括PWM接收脚，所述脉冲宽度调制信号发生单元用于产生PWM信号， 并通过所述PWM发送脚发送给所述PWM接收脚，所述光源驱动模块根据所述PWM信号辅助控制所述第一光源组和第二光源组的亮度。
  5. 根据权利要求1所述的具有阅读灯的电子阅读器，其特征在于，所述第一光源组引脚连接所述第一光源组的负极端，所述第二光源组引脚连接所述第二光源组的负极端，所述光源驱动模块还包括过压保护单元和过压保护引脚，所述过压保护引脚连接所述第一光源组的正极端和第二光源组的正极端。
  6. 根据权利要求1所述的具有阅读灯的电子阅读器，其特征在于，所述第一光源组和第二光源组均为LED灯串。
  7. 根据权利要求1所述的具有阅读灯的电子阅读器，其特征在于，所述第一寄存器和第二寄存器存储的均是256级的亮度信息。
  8. 根据权利要求1-7中任一项所述的具有阅读灯的电子阅读器，其特征在于，所述光源驱动模块的型号为LM3630A。
  9. 根据权利要求1所述的具有阅读灯的电子阅读器，其特征在于，所述阅读灯为前光式阅读灯。
  10. 根据权利要求1所述的具有阅读灯的电子阅读器，其特征在于，所述输入模块包括触控面板。
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