WO2020103199A1 - 背光控制电路及其控制方法 - Google Patents

背光控制电路及其控制方法

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Publication number
WO2020103199A1
WO2020103199A1 PCT/CN2018/119547 CN2018119547W WO2020103199A1 WO 2020103199 A1 WO2020103199 A1 WO 2020103199A1 CN 2018119547 W CN2018119547 W CN 2018119547W WO 2020103199 A1 WO2020103199 A1 WO 2020103199A1
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WIPO (PCT)
Prior art keywords
resistor
light bar
voltage
control circuit
electrically connected
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Ceased
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PCT/CN2018/119547
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English (en)
French (fr)
Inventor
何怀亮
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HKC Co Ltd
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HKC Co Ltd
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Publication date
Application filed by HKC Co Ltd filed Critical HKC Co Ltd
Publication of WO2020103199A1 publication Critical patent/WO2020103199A1/zh
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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]

Definitions

  • the present application relates to the field of display technology, in particular to a backlight control circuit and a control method thereof.
  • liquid crystal displays have many advantages such as thin body, power saving, no radiation, etc., and have been widely used.
  • Most of the liquid crystal displays on the market are backlight type liquid crystal displays, which include a liquid crystal panel and a backlight module (Backlight Module).
  • the liquid crystal panel includes a color filter substrate (Color Filter Substrate, CF Substrate, also known as a color filter substrate), a thin film transistor array substrate (Thin Film Transistor Substrate, TFT Substrate), and a transparent electrode exists on the opposite inner side of the above substrate.
  • a layer of liquid crystal molecules Liquid Crystal, LC is sandwiched between them.
  • the backlight module Since the liquid crystal display panel itself does not emit light, the light source provided by the backlight module is required to display images normally, so the backlight module becomes one of the key components of the liquid crystal display.
  • the backlight module is divided into two types: an edge type backlight module and a direct type backlight module according to different incident positions of the light source.
  • the direct-type backlight module is to place a light-emitting light source such as a cathode fluorescent lamp (Coldode Fluorescent Lamp, CCFL) or a light-emitting diode (Light Emitting Diode, LED) behind the liquid crystal panel to directly form a surface light source for the liquid crystal panel.
  • CCFL Coldode Fluorescent Lamp
  • LED Light Emitting Diode
  • the LED light bar (Light Bar) is disposed behind the side of the liquid crystal panel as a backlight source.
  • the backlight control circuit of the prior art generally generates a large resistance loss, causing a problem of heat generation of the control circuit.
  • the present application provides a backlight control circuit and a control method thereof, and the problem to be solved is to reduce the loss of the backlight source control circuit.
  • a backlight control circuit including:
  • Light bar providing backlight
  • the feedback resistor is connected in parallel with the light bar and electrically connected with the controller
  • the controller reads the first voltage across the feedback resistor and adjusts the current driving the light bar according to the first voltage
  • the resistance of the feedback resistor is greater than the resistance of the light bar.
  • the feedback resistor includes a first resistor and a second resistor, the first resistor and the second resistor are connected in series, and the first resistor and the second resistor are connected to the controller through an electrical connection, and the control The device reads the first voltage across the second resistor.
  • the first resistance is an adjustable resistance.
  • the second resistance is an adjustable resistance.
  • the resistance value of the feedback resistor is greater than 100 kilohms.
  • the resistance value of the first resistor is greater than 100 kiloohms, and the resistance value of the second resistor is greater than 100 kiloohms.
  • the controller includes a control chip and a driving chip.
  • the control chip includes a voltage comparator.
  • the voltage comparator compares the first voltage fed back by the feedback resistor with a calibration voltage.
  • the control chip uses the The result of the voltage comparator controls the driving chip to drive the light bar; the calibration voltage is the voltage required to drive the light bar.
  • control chip further includes:
  • Digital-to-analog converter to convert digital signals of electrical parameters into analog signals
  • the electrical parameter code is written through the programmable interface device, the digital signal is converted into an analog signal through a digital-to-analog converter, the voltage corrector corrects the analog signal, and the analog signal is provided to the driving chip through the voltage comparator to drive the light bar to emit light.
  • the drive chip includes an active switch to control the current input light bar; the active switch includes an input terminal and an output terminal, the input terminal is electrically connected to the control chip, and the drive chip further includes:
  • Inductance resistance one end is electrically connected to the output end, and the other end is electrically connected to the power supply;
  • the positive electrode is electrically connected to the output terminal, and the negative electrode is electrically connected to the positive electrode of the light bar;
  • One end of the capacitor is electrically connected to the negative electrode of the diode, and the other end is grounded.
  • the active switch includes a field effect transistor.
  • the light bar includes an LED light bar.
  • This application also discloses a backlight control circuit, including:
  • Light bar providing backlight
  • the feedback resistor is connected in parallel with the light bar
  • the feedback resistor includes a first resistor and a second resistor, the first resistor and the second resistor are connected in series, and the first resistor and the second resistor are connected to the controller through an electrical connection.
  • the resistance value of the second resistor is greater than 100 kiloohms;
  • the controller includes a control chip and a driving chip, and the control chip includes,
  • a voltage comparator comparing the first voltage fed back by the feedback resistor with a calibration voltage; the calibration voltage is the voltage required to drive the light bar;
  • Digital-to-analog converter to convert digital signals of electrical parameters into analog signals
  • the electrical parameter code is written through the programmable interface device, the digital signal is converted into an analog signal through the digital-to-analog converter, the voltage corrector corrects the analog signal, and the analog signal is provided to the analog signal through the voltage comparator The driver chip;
  • the drive chip includes an active switch to control the current input light bar; the active switch includes an input terminal and an output terminal, the input terminal is electrically connected to the control chip, and the drive chip further includes,
  • Inductance resistance one end is electrically connected to the output end, and the other end is electrically connected to the power supply;
  • the positive electrode is electrically connected to the output terminal, and the negative electrode is electrically connected to the positive electrode of the light bar;
  • Capacitor one end is electrically connected to the negative electrode of the diode, and the other end is grounded;
  • the active switch includes a field effect transistor.
  • This application also discloses a display device, including:
  • Light bar providing backlight
  • the backlight control circuit includes:
  • the feedback resistor is connected in parallel with the light bar and electrically connected with the controller
  • the controller reads the first voltage across the feedback resistor and adjusts the current driving the light bar according to the first voltage; the resistance of the feedback resistor is greater than the resistance of the light bar.
  • the feedback resistor includes a first resistor and a second resistor, the first resistor and the second resistor are connected in series, and the first resistor and the second resistor are connected to the controller through an electrical connection.
  • the controller reads the first voltage across the second resistor.
  • the first resistance is an adjustable resistance.
  • the second resistance is an adjustable resistance.
  • the resistance value of the feedback resistor is greater than 100 kilohms.
  • the controller includes a control chip and a driving chip
  • the control chip includes a voltage comparator
  • the voltage comparator compares the first voltage fed back by the feedback resistor with a calibration voltage
  • the control The chip controls the driving chip to drive the light bar through the result of the voltage comparator
  • the calibration voltage is a voltage required to drive the light bar.
  • control chip further includes:
  • a digital-to-analog converter to convert the digital signal of the electrical parameter into an analog signal
  • the electrical parameter code is written through the programmable interface device, the digital signal is converted into an analog signal through a digital-to-analog converter, the voltage corrector corrects the analog signal, and the analog signal is provided to the driving chip through the voltage comparator to drive the light bar to emit light.
  • the drive chip includes an active switch to control the current input light bar; the active switch includes an input terminal and an output terminal, the input terminal is electrically connected to the control chip, and the drive chip further includes:
  • Inductance resistance one end is electrically connected to the output end, and the other end is electrically connected to the power supply;
  • the positive electrode is electrically connected to the output terminal, and the negative electrode is electrically connected to the positive electrode of the light bar;
  • One end of the capacitor is electrically connected to the negative electrode of the diode, and the other end is grounded.
  • the active switch includes a field effect transistor.
  • the present application also discloses a control method of a backlight control circuit.
  • the control circuit includes:
  • Light bar providing backlight
  • the feedback resistor is connected in parallel with the light bar and electrically connected with the controller
  • the controller reads the first voltage across the feedback resistor and adjusts the current driving the light bar according to the first voltage
  • the resistance of the feedback resistor is greater than the resistance of the light bar
  • the method includes the steps of:
  • the controller collects the first voltage fed back by the feedback resistor and compares it with the calibration voltage. If the value is the same, it ends; if the value is different, readjust the electrical parameters required by the backlight, and enter the step of converting the digital signal into an analog signal. .
  • the feedback resistor is connected in series with the light bar.
  • the drive current of the controller flows into the light bar, it can be obtained from the Joule's theorem that the feedback resistance will cause a large amount of power consumption.
  • the feedback resistor is connected in parallel with the light bar to make the resistance of the feedback resistor greater than the resistance of the light bar, so that the current flowing into the feedback resistor is smaller than the current flowing into the light bar, reducing the current generated by the feedback resistor Heat generation reduces the power consumption due to the heating of the feedback resistor, thereby achieving the effect of reducing losses.
  • the voltage value can be fed back through the feedback resistor, and the controller can drive the light bar according to the feedback voltage value to effectively control the required backlight intensity.
  • FIG. 1 is a schematic diagram of a backlight control circuit according to an embodiment of the present application
  • FIG. 2 is a schematic diagram of another backlight control circuit according to an embodiment of the present application.
  • FIG. 3 is a schematic diagram of another backlight control circuit according to an embodiment of the present application.
  • FIG. 4 is a schematic diagram of another backlight control circuit according to an embodiment of the present application.
  • FIG. 5 is a schematic diagram of steps of a method for controlling a backlight control circuit according to an embodiment of the present application.
  • connection should be understood in a broad sense, for example, it can be fixed connection or detachable Connected, or connected integrally; either mechanically or electrically; directly connected, or indirectly connected through an intermediary, or internally connected between two components.
  • installation should be understood in a broad sense, for example, it can be fixed connection or detachable Connected, or connected integrally; either mechanically or electrically; directly connected, or indirectly connected through an intermediary, or internally connected between two components.
  • the voltage comparator 23 controls the luminous intensity by controlling the current flowing through the light bar 10, the third resistor R3 The voltage value of the light bar 10 is fed back, and then the voltage value fed back by the third resistor R3 is compared with the calibration voltage via the voltage comparator 23 to achieve the purpose of controlling the backlight. Since the current flowing through the LED lamp will definitely flow through the third resistor R3, it can be known from Joule's law that the design of the third resistor R3 will cause a large amount of power consumption. In view of this phenomenon, a method to improve the control of the backlight is designed.
  • an embodiment of the present application discloses a backlight control circuit, including: a light bar 10 that provides a backlight, a controller 20 that drives the light bar 10, and a feedback resistor 30; the feedback resistor 30 and the lamp
  • the bar 10 is connected in parallel and electrically connected to the controller 20; the controller 20 reads the first voltage V1 across the feedback resistor 30 and adjusts the current driving the light bar 10 according to the first voltage V1; the resistance of the feedback resistor 30 is greater than the lamp Bar 10 resistance.
  • the light bar of this embodiment is an LED light bar.
  • the feedback resistor 30 is connected in parallel with the light bar 10 to make the resistance of the feedback resistor 30 greater than that of the light bar 10, so that the current flowing into the feedback resistor 30 is smaller than the current flowing into the light bar 10, reducing the current flow.
  • the heat generated by the feedback resistor 30 reduces the power consumption due to the heat generated by the feedback resistor 30, thereby reducing the loss; at the same time, the voltage value can be fed back through the feedback resistor 30, and the controller can drive the light bar according to the feedback voltage value to effectively control The required backlight intensity.
  • the feedback resistor 30 includes a first resistor R1 and a second resistor R2, the first resistor R1 and the second resistor R2 are connected in series, and the first resistor R1 and the second resistor R2 are connected to the controller 20 through an electrical connection The controller 20 reads the first voltage V1 across the second resistor R2.
  • the first resistor R1 is an adjustable resistor, and the resistance value of the first resistor R1 is greater than 100 kilohms.
  • the backlight brightness required in different environments is different, and the electrical parameters required for the different luminous quantities of the light bar 10 are different.
  • the second resistor R2 is an adjustable resistor, and the resistance value of the second resistor R2 is greater than 100 kilohms.
  • the first voltage V1 fed back by the second resistor R2 is given to the controller 20, and the controller 20 compares the first voltage V1 with the required electrical parameter, and the second resistor R2 can adjust the resistance so that the appropriate The voltage range is compared with the required electrical parameters.
  • the resistance value of the feedback resistor 30 is greater than 100 kilohms.
  • the value of the feedback resistor 30 is greater than 100 kiloohms, the current is negligible, and the power is approximately zero, thereby achieving low power consumption.
  • the controller 20 includes a control chip 21 and a driving chip 22.
  • the control chip 21 includes a voltage comparator 23, and the voltage comparator 23 compares the first voltage V1 fed back by the feedback resistor 30 with the calibration voltage.
  • the input electrical parameters are adjusted according to different pressure differences, and then the driving chip 22 is controlled to adjust the current for driving the light bar 10, so that the first voltage value conforms to the calibration voltage.
  • the voltage comparator 23 compares the first voltage V1 fed back by the feedback resistor 30 with the calibration voltage. If the results are the same, the controller 20 drives the light bar 10 to emit light. If the results are different, the controller 20 adjusts the input lamp. Article 10 current. The voltage across the light bar 10 can be corrected by the voltage comparator 23 so that the voltage across the light bar 10 is the voltage parameter required by the backlight.
  • control chip 21 further includes; a register 24, which stores the input electrical parameters and commands; a programmable interface 25, which is electrically connected to the register 24; a digital-to-analog converter 26, which converts the digital signals of electrical parameters It is analog signal; voltage corrector 27, analog signal correction; write electrical parameter code through programmable interface 25, convert digital signal into analog signal through digital-to-analog converter 26, voltage corrector 27 corrects the analog signal, through The voltage comparator 23 provides an analog signal to the driving chip 22 to drive the light bar 10 to emit light.
  • the desired electrical parameters can be artificially output, that is, the calibration voltage required for the backlight of the light bar 10 is input through the programmable interface 25, which is convenient for adjusting the brightness of the backlight source provided by the light bar 10, and also includes voltage correction
  • the device 27 can ensure that the signal output to the driving chip 22 is accurate, and indirectly ensures that the driving chip 22 drives the light bar 10 to emit light correctly.
  • the driver chip 22 includes an active switch 29 to control the current input to the light bar 10; the active switch 29 includes an input terminal 290 and an output terminal 291, the input terminal 290 is electrically connected to the control chip 21, and the driver chip 22 further includes: Inductance resistance RL, one end is electrically connected to the output end 291, and the other end is electrically connected to the power supply VCC; diode 28, the anode is electrically connected to the output end 291, the cathode is electrically connected to the anode of the light bar 10; the capacitor C, one end is connected to the diode 28 The negative pole of the is electrically connected, and the other end is grounded.
  • the driving chip 22 includes an active switch 29, which can control the relationship between input and output, and can output when the input is within a certain range, providing the necessary condition for the driving chip 22 to make the light bar 10 emit light.
  • the active switch 29 includes a field effect transistor 293 (MOS tube).
  • MOS tube controls the drain current of the output terminal 291 by the voltage applied to the gate of the input terminal 290.
  • MOS tube is a voltage control device. It controls the characteristics of the device through the voltage applied to the gate, and the charge storage effect caused by the base current when the transistor is switched will not occur. Therefore, in switching applications, the switching speed of the MOS tube Faster than triode, it is an ideal analog switching device.
  • a backlight control circuit including: a control chip 21, a driving chip 22, a light bar 10, and a feedback resistor 30; the feedback resistor 30 is connected in parallel with the light bar 10 ;
  • the feedback resistor 30 includes a first resistor R1 and a second resistor R2, the first resistor R1 and the second resistor R2 are connected in series, the first resistor R1 and the second resistor R2 are connected to the controller 20 through an electrical connection, the first resistor R1
  • the resistance value of the second resistor R2 is greater than 100 kilohms;
  • the control chip 21 includes: a voltage comparator 23, which compares the first voltage V1 and the calibration voltage fed back by the feedback resistor 30; a register 24, which stores the input electrical parameters and commands; Programming interface 25, electrically connected to register 24; digital-to-analog converter 26, converting digital signals of electrical parameters into analog signals; voltage corrector 27, analog signal correction; writing electrical parameter codes through programmable interface 25, The digital signal is converted
  • the feedback resistor 30 Connect the feedback resistor 30 and the light bar 10 in parallel.
  • the value of the feedback resistor 30 is greater than 100 kiloohms, the current is negligible, and the power is approximately zero. Low power consumption.
  • a control method of a backlight control circuit including:
  • S54 Drive the light bar to emit light according to the analog signal through the controller
  • S55 The controller collects the first voltage fed back by the feedback resistor and compares it with the calibration voltage
  • the desired electrical parameters can be artificially output, which is convenient for adjusting the brightness of the backlight provided by the light bar 10, and output reliable electrical parameters according to the feedback voltage value to effectively control the backlight.
  • the panel of this application may be a TN panel (full name Twisted Nematic, namely twisted nematic panel), IPS panel (In-PlaneSwitcing, plane conversion), VA panel (Multi-domain Vertica Alignment, multi-quadrant vertical alignment technology), of course , Can also be other types of panels, just apply.
  • TN panel full name Twisted Nematic, namely twisted nematic panel
  • IPS panel In-PlaneSwitcing, plane conversion
  • VA panel Multi-domain Vertica Alignment, multi-quadrant vertical alignment technology

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

本申请公开了一种背光控制电路及其控制方法，包括：提供背光源的灯条，驱动灯条的控制器，和反馈电阻；所述反馈电阻与所述灯条并联，与所述控制器电连接；所述控制器读取所述反馈电阻两端的第一电压，并根据第一电压调整驱动所述灯条的电流；所述反馈电阻的阻值大于所述灯条的阻值。

Description

背光控制电路及其控制方法
本申请要求于2018年11月21日提交中国专利局，申请号为CN201811389240.X，发明名称为“一种背光控制电路和控制方法”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
本申请涉及显示技术领域，尤其涉及一种背光控制电路及其控制方法。
背景技术
这里的陈述仅提供与本申请有关的背景信息，而不必然地构成现有技术。
随着科技的发展和进步，液晶显示器具有机身薄、省电、无辐射等众多优点，得到了广泛的应用。市场上的液晶显示器大部分为背光型液晶显示器，其包括液晶面板及背光模组(Backlight Module)。液晶面板包括彩膜基板(Color Filter Substrate，CF Substrate，也称彩色滤光片基板)、薄膜晶体管阵列基板(Thin Film Transistor Substrate，TFT Substrate)，上述基板的相对内侧存在透明电极，两片基板之间夹一层液晶分子(Liquid Crystal，LC)。
由于液晶显示面板本身不发光，需要借由背光模组提供的光源来正常显示影像，因此背光模组成为液晶显示器的关键组件之一。背光模组依照光源入射位置的不同分成侧入式背光模组与直下式背光模组两种。直下式背光模组是将发光光源例如阴极萤光灯管(Cold Cathode Fluorescent Lamp，CCFL)或发光二极管(Light Emitting Diode，LED)设置在液晶面板后方，直接形成面光源提供给液晶面板。而侧入式背光模组是将LED灯条(Light Bar)设于液晶面板的侧后方作为背光源。现有技术的背光控制电路一般产生较大的电阻损耗，造成控制电路发热的问题。
技术解决方案
本申请提供一种背光控制电路及其控制方法，所要解决是降低背光源控制电路损耗。
为实现上述目的，本申请提供了一种背光控制电路，包括：
灯条，提供背光源；
控制器，驱动灯条；
反馈电阻，与所述灯条并联，与所述控制器电连接；
所述控制器读取所述反馈电阻两端的第一电压，并根据第一电压调整驱动所述灯条的电流；
所述反馈电阻的阻值大于所述灯条的阻值。
可选的，所述反馈电阻包括第一电阻和第二电阻，所述第一电阻和第二电阻串联，所述 第一电阻和第二电阻之间通过电连接与控制器相连，所述控制器读取第二电阻两端的第一电压。
可选的，所述第一电阻为可调电阻。
可选的，所述第二电阻为可调电阻。
可选的，所述反馈电阻的电阻值大于100千欧。
可选的，所述第一电阻的电阻值大于100千欧，所述第二电阻的电阻值大于100千欧。
可选的，所述控制器包括控制芯片和驱动芯片，所述控制芯片包括电压比较器，所述电压比较器将反馈电阻反馈的第一电压与校准电压作比较，所述控制芯片通过所述电压比较器的结果控制所述驱动芯片驱动灯条；所述校准电压为驱动所述灯条所需的电压。
可选的，所述控制芯片还包括：
寄存器，储存输入的电性参数及命令；
可编程接口器，与寄存器电连接；
数字模拟转换器，把电性参数的数字信号转为模拟信号；
电压校正器，模拟信号校正；
通过可编程接口器编写电性参数代码，经数字模拟转换器将数字信号转换成模拟信号，电压校正器对模拟信号进行校正，通过电压比较器将模拟信号提供给驱动芯片驱动灯条发光。
可选的，所述驱动芯片包括主动开关，控制电流输入灯条；所述主动开关包括，输入端和输出端，所述输入端与所述控制芯片电连接，所述驱动芯片还包括：
电感电阻，一端与所述输出端电连接，另一端与电源电连接；
二极管，正极与所述输出端电连接，负极与灯条的正极电连接；
电容，一端与所述二级管的负极电连接，另一端接地。
可选的，所述主动开关包括场效应晶体管。
可选的，所述灯条包括LED灯条。
本申请还公开了一种背光控制电路，包括：
灯条，提供背光源；
控制器，驱动灯条；
反馈电阻，与所述灯条并联；
所述反馈电阻包括第一电阻和第二电阻，所述第一电阻和第二电阻串联，所述第一电阻和第二电阻之间通过电连接与控制器相连，所述第一电阻和第二电阻的电阻值大于100千欧；
所述控制器包括控制芯片和驱动芯片，所述控制芯片包括，
电压比较器，比较反馈电阻反馈的第一电压与校准电压；所述校准电压为驱动所述灯条所需的电压；
寄存器，储存输入的电性参数及命令；
可编程接口器，与寄存器电连接；
数字模拟转换器，把电性参数的数字信号转为模拟信号；
电压校正器，模拟信号校正；
通过所述可编程接口器编写电性参数代码，经所述数字模拟转换器将数字信号转换成模拟信号，所述电压校正器对模拟信号进行校正，通过所述电压比较器将模拟信号提供给所述驱动芯片；
所述驱动芯片包括主动开关，控制电流输入灯条；所述主动开关包括，输入端和输出端，所述输入端与所述控制芯片电连接，所述驱动芯片还包括，
电感电阻，一端与所述输出端电连接，另一端与电源电连接；
二极管，正极与所述输出端电连接，负极与灯条的正极电连接；
电容，一端与所述二级管的负极电连接，另一端接地；
所述主动开关包括场效应晶体管。
本申请还公开了一种显示装置，包括：
灯条，提供背光源；
背光控制电路；
所述背光控制电路包括：
控制器，驱动灯条；
反馈电阻，与所述灯条并联，与所述控制器电连接；
所述控制器读取所述反馈电阻两端的第一电压，并根据第一电压调整驱动所述灯条的电流；所述反馈电阻的阻值大于所述灯条的阻值。
可选的，所述反馈电阻包括第一电阻和第二电阻，所述第一电阻和第二电阻串联，所述第一电阻和第二电阻之间通过电连接与所述控制器相连，所述控制器读取第二电阻两端的第一电压。
可选的，所述第一电阻为可调电阻。
可选的，所述第二电阻为可调电阻。
可选的，所述反馈电阻的电阻值大于100千欧。
可选的，其中，所述控制器包括控制芯片和驱动芯片，所述控制芯片包括电压比较器，所述电压比较器将所述反馈电阻反馈的第一电压与校准电压作比较，所述控制芯片通过所述电压比较器的结果控制所述驱动芯片驱动所述灯条，所述校准电压为驱动所述灯条所需的电 压。
可选的，所述控制芯片还包括：
寄存器，储存输入的电性参数及命令；
可编程接口器，与寄存器电连接；
数字模拟转换器，把所述电性参数的数字信号转为模拟信号；
电压校正器，模拟信号校正；
通过可编程接口器编写电性参数代码，经数字模拟转换器将数字信号转换成模拟信号，电压校正器对模拟信号进行校正，通过电压比较器将模拟信号提供给驱动芯片驱动灯条发光。
可选的，所述驱动芯片包括主动开关，控制电流输入灯条；所述主动开关包括，输入端和输出端，所述输入端与所述控制芯片电连接，所述驱动芯片还包括：
电感电阻，一端与所述输出端电连接，另一端与电源电连接；
二极管，正极与所述输出端电连接，负极与灯条的正极电连接；
电容，一端与所述二级管的负极电连接，另一端接地。
可选的，所述主动开关包括场效应晶体管。
本申请还公开了一种背光控制电路的控制方法，所述控制电路包括：
灯条，提供背光源；
控制器，驱动灯条；
反馈电阻，与所述灯条并联，与所述控制器电连接；
所述控制器读取所述反馈电阻两端的第一电压，并根据第一电压调整驱动所述灯条的电流；
所述反馈电阻的阻值大于所述灯条的阻值；
所述方法包括步骤：
确定背光源所需的电性参数；将数字信号转换成模拟信号；对模拟信号进行校正；通过控制器根据模拟信号驱动灯条发光；
控制器采集反馈电阻反馈的第一电压与校准电压作比较，值相同，则结束；值不同，重新调整背光源所需的电性参数，进入所述将数字信号转换成模拟信号的步骤继续进行。
根据发明人发现，反馈电阻与灯条串联，当控制器驱动电流流入灯条时，由焦耳定理可得，反馈电阻会导致大量的功耗。本申请中，通过反馈电阻与灯条并联的方式，使反馈电阻的阻值大于灯条的阻值，使得反馈电阻流入的电流小于流入灯条的电流，减少了电流流过反馈电阻而产生的发热，降低了因为反馈电阻发热产生的功耗，从而达到降低损耗的作用；同时可以通过反馈电阻反馈电压值，根据反馈电压值控制器驱动灯条，有效控制需要的背光强 度。
附图说明
所包括的附图用来提供对本申请实施例的理解，其构成了说明书的一部分，例示本申请的实施方式，并与文字描述一起来阐释本申请的原理。显而易见地，下面描述中的附图仅仅是本申请的一些实施例，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他的附图。在附图中：
图1是本申请实施例一种背光控制电路的示意图；
图2是本申请实施例另一种背光控制电路的示意图；
图3是本申请实施例另一种背光控制电路的示意图；
图4是本申请实施例另一种背光控制电路的示意图；
图5是本申请实施例一种背光控制电路的控制方法的步骤示意图。
具体实施方式
这里所公开的具体结构和功能细节仅仅是代表性的，并且是描述本申请的示例性实施例的目的。但是本申请可以通过许多替换形式来具体实现，并且不应当被解释成仅仅受限于这里所阐述的实施例。
在本申请的描述中，需要理解的是，术语“中心”、“横向”、“上”、“下”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。此外，术语“第一”、“第二”仅描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征。在本申请的描述中，除非另有说明，“多个”的含义是两个或两个以上。另外，术语“包括”及其任何变形，意图在于覆盖不排他的包含。
在本申请的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本申请中的具体含义。
这里所使用的术语仅仅是为了描述具体实施例而不意图限制示例性实施例。除非上下文明确地另有所指，否则这里所使用的单数形式“一个”、“一项”还意图包括复数。还应当理解的是，这里所使用的术语“包括”和/或“包含”规定所陈述的特征、整数、步骤、操作、单元和/或组件的存在，而不排除存在或添加一个或更多其他特征、整数、步骤、操作、单 元、组件和/或其组合。
薄膜晶体管液晶显示器(thin film transistor-liquid crystal display，TFT-LCD)在进行像素显示矩阵(Array)设计时，电压比较器23通过控制流过灯条10的电流来控制发光强度，第三电阻R3反馈灯条10的电压值，再经由电压比较器23将第三电阻R3反馈的电压值与校准电压做比较，实现控制背光源的目的。因流经LED灯的电流必将流过第三电阻R3，由焦耳定律可知，第三电阻R3的设计会导致大量的功耗，针对此现象，设计了一种改善控制背光源的方法。
下面结合附图和实施例对本申请作说明。
如图2至图4所示，本申请实施例公布了一种背光控制电路，包括：提供背光源的灯条10，驱动灯条10的控制器20，和反馈电阻30；反馈电阻30与灯条10并联，与控制器20电连接；控制器20读取反馈电阻30两端的第一电压V1，并根据第一电压V1调整驱动所述灯条10的电流；反馈电阻30的阻值大于灯条10的阻值。
本实施例的灯条为LED灯条。
本方案中，通过反馈电阻30与灯条10并联的方式，使反馈电阻30的阻值大于灯条10的阻值，使得反馈电阻30流入的电流小于流入灯条10的电流，减少了电流流过反馈电阻30而产生的发热，降低了因为反馈电阻30发热产生的功耗，从而达到降低损耗的作用；同时可以通过反馈电阻30反馈电压值，根据反馈电压值控制器驱动灯条，有效控制需要的背光强度。
在一实施例中，反馈电阻30包括第一电阻R1和第二电阻R2，第一电阻R1和第二电阻R2串联，第一电阻R1和第二电阻R2之间通过电连接与控制器20相连，控制器20读取第二电阻R2两端的第一电压V1。
本方案中，使用两个反馈电阻30串联起来，利用串联电路电阻分压的原理，使得两个电阻将反馈的第一电压V1小于灯条10两端的电压。
在一实施例中，第一电阻R1为可调电阻，第一电阻R1的电阻值大于100千欧。
本方案中，不同的环境所需的背光亮度不一样，灯条10不同发光量所需的电性参数不一样，将第一电阻R1设置成可调电阻，提供不同的电性参数需要合适的阻值。
在一实施例中，第二电阻R2为可调电阻，第二电阻R2的电阻值大于100千欧。
本方案中，第二电阻R2反馈的第一电压V1给到控制器20，控制器20将第一电压V1与所需的电性参数作比较，第二电阻R2可调节阻值，使得出现合适电压范围与所需的电性参数作比较。
在一实施例中，反馈电阻30的电阻值大于100千欧。
本方案中，反馈电阻30值越大，流入反馈电阻30的电流越小，反馈电阻30的值大于 100千欧的时候，电流可以忽略不计，实现功率近似为零，从而实现低功耗。
在一实施例中，控制器20包括控制芯片21和驱动芯片22，控制芯片21包括电压比较器23，电压比较器23将反馈电阻30反馈的第一电压V1与校准电压作比较，当第一电压值V1与校准电压存在压差时，根据不同的压差调整输入的电性参数，进而控制驱动芯片22调整驱动灯条10的电流，由此来使得第一电压值符合校准电压。
本方案中，通过电压比较器23对反馈电阻30反馈的第一电压V1与校准电压作比较，若结果相同，则控制器20驱动灯条10发光，若结果不同，则控制器20调整输入灯条10的电流。通过电压比较器23可校正灯条10两端的电压，使灯条10两端的电压是背光所需的电压参数。
在一实施例中，控制芯片21还包括；寄存器24，储存输入的电性参数及命令；可编程接口器25，与寄存器24电连接；数字模拟转换器26，把电性参数的数字信号转为模拟信号；电压校正器27，模拟信号校正；通过可编程接口器25编写电性参数代码，经数字模拟转换器26将数字信号转换成模拟信号，电压校正器27对模拟信号进行校正，通过电压比较器23将模拟信号提供给驱动芯片22驱动灯条10发光。
本方案中，可以人为的输出想要的电性参数，即通过可编程接口器25输入灯条10背光所需的校准电压，方便对灯条10提供的背光源亮度进行调节，同时包括电压校正器27，可以保证输出到驱动芯片22的信号准确无误，间接保证了驱动芯片22驱动灯条10正确发光。
在一实施例中，驱动芯片22包括主动开关29，控制电流输入灯条10；主动开关29包括，输入端290和输出端291，输入端290与控制芯片21电连接，驱动芯片22还包括：电感电阻RL，一端与输出端291电连接，另一端与电源VCC电连接；二极管28，正极与输出端291电连接，负极与灯条10的正极电连接；电容C，一端与二级管28的负极电连接，另一端接地。驱动芯片22包括主动开关29，可以控制输入与输出之间的关系，当输入在一定范围的时候可以输出，提供了驱动芯片22使灯条10发光的必要条件。
在一实施例中，主动开关29包括场效应晶体管293(MOS管)。
本方案中，无论N型或者P型MOS管，其工作原理本质是一样的。MOS管是由加在输入端290栅极的电压来控制输出端291漏极的电流。MOS管是压控器件它通过加在栅极上的电压控制器件的特性，不会发生像三极管做开关时的因基极电流引起的电荷存储效应，因此在开关应用中，MOS管的开关速度比三极管快，是理想的模拟开关器件。
作为本申请的另一实施例，如图4所示，公开了一种背光控制电路，包括：控制芯片21,驱动芯片22，灯条10，以及反馈电阻30；反馈电阻30与灯条10并联；反馈电阻30包括第一电阻R1和第二电阻R2，第一电阻R1和第二电阻R2串联，第一电阻R1和第二电阻R2之间通过电连接与控制器20相连，第一电阻R1和第二电阻R2的电阻值大于100千欧； 控制芯片21包括：电压比较器23，比较反馈电阻30反馈的第一电压V1与校准电压；寄存器24，储存输入的电性参数及命令；可编程接口器25，与寄存器24电连接；数字模拟转换器26，把电性参数的数字信号转为模拟信号；电压校正器27，模拟信号校正；通过可编程接口器25编写电性参数代码，经数字模拟转换器26将数字信号转换成模拟信号，电压校正器27对模拟信号进行校正，通过电压比较器23将模拟信号提供给驱动芯片22；驱动芯片22包括：主动开关29，控制电流输入灯条10；主动开关29包括，输入端290和输出端291，输入端290与控制芯片21电连接；电感电阻RL，一端与输出端291电连接，另一端与电源VCC电连接；二极管28，正极与输出端291电连接，负极与灯条10的正极电连接；电容C，一端与二级管的负极电连接，另一端接地；主动开关包括场效应晶体管293。
将反馈电阻30与灯条10并联，反馈电阻30值越大，流入反馈电阻30的电流越小，反馈电阻30值大于100千欧的时候，电流可以忽略不计，实现功率近似为零，从而实现低功耗。
作为本申请的另一实施例，如图5所示，公开了一种背光控制电路的控制方法，包括：
S51：确定背光源所需的电性参数；
S52：将数字信号转换成模拟信号；
S53：对模拟信号进行校正；
S54：通过控制器根据模拟信号驱动灯条发光；
S55：控制器采集反馈电阻反馈的第一电压与校准电压作比较；
S56：值相同，则结束；值不同，重新调整背光源所需的电性参数，进入所述将数字信号转换成模拟信号的步骤继续进行。
可以人为的输出想要的电性参数，方便对灯条10提供的背光源亮度进行调节,根据反馈的电压值重新输出可靠的电性参数，有效控制背光源。
需要说明的是，本方案中涉及到的各步骤的限定，在不影响具体方案实施的前提下，并不认定为对步骤先后顺序做出限定，写在前面的步骤可以是在先执行的，也可以是在后执行的，甚至也可以是同时执行的，只要能实施本方案，都应当视为属于本申请的保护范围。
本申请的面板可以是TN面板(全称为Twisted Nematic，即扭曲向列型面板)、IPS面板(In-PlaneSwitcing，平面转换)、VA面板(Multi-domain Vertica Alignment，多象限垂直配向技术)，当然，也可以是其他类型的面板，适用即可。
以上内容是结合具体的实施方式对本申请所作的详细说明，不能认定本申请的具体实施只局限于这些说明。对于本申请所属技术领域的普通技术人员来说，在不脱离本申请构思的前提下，还可以做出若干简单推演或替换，都应当视为属于本申请的保护范围。

Claims (17)

  1. 一种背光控制电路，包括：
    灯条，提供背光源；
    控制器，驱动灯条；
    反馈电阻，与所述灯条并联，与所述控制器电连接；
    所述控制器读取所述反馈电阻两端的第一电压，并根据第一电压调整驱动所述灯条的电流；
    所述反馈电阻的阻值大于所述灯条的阻值。
  2. 如权利要求1所述的一种背光控制电路，其中，所述反馈电阻包括第一电阻和第二电阻，所述第一电阻和第二电阻串联，所述第一电阻和第二电阻之间通过电连接与所述控制器相连，所述控制器读取第二电阻两端的第一电压。
  3. 如权利要求2所述的一种背光控制电路，其中，所述第一电阻为可调电阻。
  4. 如权利要求2所述的一种背光控制电路，其中，所述第二电阻为可调电阻。
  5. 如权利要求1所述的一种背光控制电路，其中，所述反馈电阻的电阻值大于100千欧。
  6. 如权利要求2所述的一种背光控制电路，其中，所述第一电阻的电阻值大于100千欧，所述第二电阻的电阻值大于100千欧。
  7. 如权利要求3所述的一种背光控制电路，其中，所述第一电阻的电阻值大于100千欧。
  8. 如权利要求4所述的一种背光控制电路，其中，所述第二电阻的电阻值大于100千欧。
  9. 如权利要求1所述的一种背光控制电路，其中，所述控制器包括控制芯片和驱动芯片，所述控制芯片包括电压比较器，所述电压比较器将所述反馈电阻反馈的第一电压与校准电压作比较，所述控制芯片通过所述电压比较器的结果控制所述驱动芯片驱动所述灯条，所述校准电压为驱动所述灯条所需的电压。
  10. 如权利要求9所述的一种背光控制电路，其中，所述控制芯片还包括：
    寄存器，储存输入的电性参数及命令；
    可编程接口器，与寄存器电连接；
    数字模拟转换器，把所述电性参数的数字信号转为模拟信号；
    电压校正器，模拟信号校正；
    通过可编程接口器编写电性参数代码，经数字模拟转换器将数字信号转换成模拟信号， 电压校正器对模拟信号进行校正，通过电压比较器将模拟信号提供给驱动芯片驱动灯条发光。
  11. 如权利要求10所述的一种背光控制电路，其中，所述驱动芯片包括主动开关，控制电流输入灯条；所述主动开关包括，输入端和输出端，所述输入端与所述控制芯片电连接，所述驱动芯片还包括：
    电感电阻，一端与所述输出端电连接，另一端与电源电连接；
    二极管，正极与所述输出端电连接，负极与灯条的正极电连接；
    电容，一端与所述二级管的负极电连接，另一端接地。
  12. 如权利要求11所述的一种背光控制电路，其中，所述主动开关包括场效应晶体管。
  13. 如权利要求12所述的一种背光控制电路，其中，所述灯条包括LED灯条。
  14. 如权利要求9所述的一种背光控制电路，其中，所述反馈电阻包括第一电阻和第二电阻，所述第一电阻和第二电阻串联，所述第一电阻和第二电阻之间通过电连接与所述控制器相连，所述控制器读取第二电阻两端的第一电压。
  15. 如权利要求14所述的一种背光控制电路，其中，所述第一电阻为可调电阻。
  16. 一种背光控制电路，包括：
    灯条，提供背光源；
    控制模块，驱动灯条；
    反馈电阻，与所述灯条并联；
    所述反馈电阻包括第一电阻和第二电阻，所述第一电阻和第二电阻串联，所述第一电阻和第二电阻之间通过电连接与控制模块相连，所述第一电阻和第二电阻的电阻值大于100千欧；
    所述控制模块包括控制单元和驱动单元，所述控制单元包括：
    电压比较器，比较反馈电阻反馈的第一电压与校准电压；所述校准电压为驱动所述灯条所需的电压；
    寄存器，储存输入的电性参数及命令；
    可编程接口单元，与寄存器电连接；
    数字模拟转换器，把电性参数的数字信号转为模拟信号；
    电压校正单元，模拟信号校正；
    通过所述可编程接口单元编写电性参数代码，经所述数字模拟转换器将数字信号转换成模拟信号，所述电压校正单元对模拟信号进行校正，通过所述电压比较器将模拟信号提供给所述驱动单元；
    所述驱动单元包括主动开关，控制电流输入灯条；所述主动开关包括，输入端和输出端， 所述输入端与所述控制单元电连接，所述驱动单元还包括：
    电感电阻，一端与所述输出端电连接，另一端与电源电连接；
    二极管，正极与所述输出端电连接，负极与灯条的正极电连接；
    电容，一端与所述二级管的负极电连接，另一端接地；
    所述主动开关包括场效应晶体管。
  17. 一种背光控制电路的控制方法，所述控制电路包括：
    灯条，提供背光源；
    控制器，驱动灯条；
    反馈电阻，与所述灯条并联，与所述控制器电连接；
    所述控制器读取所述反馈电阻两端的第一电压，并根据第一电压调整驱动所述灯条的电流；
    所述反馈电阻的阻值大于所述灯条的阻值；
    所述控制方法包括步骤：
    确定背光源所需的电性参数；将数字信号转换成模拟信号；对模拟信号进行校正；通过控制器根据模拟信号驱动灯条发光；
    控制器采集反馈电阻反馈的第一电压与校准电压作比较，值相同，则结束；值不同，重新调整背光源所需的电性参数，进入所述将数字信号转换成模拟信号的步骤继续进行。
PCT/CN2018/119547 2018-11-21 2018-12-06 背光控制电路及其控制方法 Ceased WO2020103199A1 (zh)

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