WO2016061845A1 - 模拟调光转换电路及显示装置 - Google Patents

模拟调光转换电路及显示装置 Download PDF

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WO2016061845A1
WO2016061845A1 PCT/CN2014/090036 CN2014090036W WO2016061845A1 WO 2016061845 A1 WO2016061845 A1 WO 2016061845A1 CN 2014090036 W CN2014090036 W CN 2014090036W WO 2016061845 A1 WO2016061845 A1 WO 2016061845A1
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voltage
dividing unit
analog dimming
voltage dividing
resistor
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English (en)
French (fr)
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张先明
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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 KR1020177012276A priority Critical patent/KR20170063951A/ko
Priority to RU2017113527A priority patent/RU2660928C1/ru
Priority to GB1705448.7A priority patent/GB2547356B/en
Priority to US14/417,630 priority patent/US9408260B2/en
Priority to JP2017520958A priority patent/JP6405043B2/ja
Publication of WO2016061845A1 publication Critical patent/WO2016061845A1/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
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/20—Controlling the colour of the light
    • 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
    • H05B45/395—Linear regulators
    • 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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the present invention relates to the field of display technologies, and in particular to an analog dimming conversion circuit and a display device.
  • LED Light-Emitting Diode
  • Analog Dimming (ADIM) technology has the advantages of no noise compared to the traditional PWM Dimming technology.
  • the existing analog dimming technology can support a narrow dimming range, and can only perform linear dimming between 0.5V and 2.5V of the dimming signal, if the dimming signal is 0V to 0.5V or greater. At 2.5V, analog dimming is not possible. In the display process, the dimming signal is usually between 0V and 3.3V.
  • the existing analog dimming technology has a dimming range, so there is a technical problem of poor dimming capability.
  • the invention provides an analog dimming conversion circuit, comprising a first voltage dividing unit, a second voltage dividing unit and a constant voltage unit;
  • the input end of the first voltage dividing unit receives an analog dimming input signal, and the output end of the first voltage dividing unit outputs a first intermediate voltage
  • the output of the constant voltage unit outputs a constant second intermediate voltage
  • the first input end and the second input end of the second voltage dividing unit respectively receive the first intermediate voltage and the second intermediate voltage, and an output end of the second voltage dividing unit outputs an analog dimming output signal.
  • a diode is connected to the output end of the second voltage dividing unit, and a 2D/3D conversion signal is connected to the output end of the second voltage dividing unit through the diode.
  • an output of the first voltage dividing unit and/or an output of the constant voltage unit is provided with a voltage follower.
  • the first voltage dividing unit includes a first resistor and a second resistor connected in series between the input end and the ground, wherein the first voltage is between the first resistor and the second resistor The output of the unit.
  • the first resistance is 114 k ⁇
  • the second resistance is 200 k ⁇
  • the analog dimming input signal ranges from 0 V to 3.3 V.
  • the constant voltage unit includes a reference voltage source and a third resistor and a fourth resistor connected in series between the reference voltage source and the ground, and the third resistor and the fourth resistor are The output of the constant voltage unit.
  • the third resistance is 182 k ⁇
  • the fourth resistance is 20 k ⁇ .
  • the second voltage dividing unit includes a fifth resistor and a sixth resistor connected in series between the first input end and the second input end, wherein the fifth resistor and the sixth resistor are The output of the second voltage dividing unit.
  • the fifth resistance is 83 k ⁇
  • the sixth resistance is 15 k ⁇ .
  • the present invention also provides a display device comprising an analog dimming circuit and the above-described analog dimming conversion circuit, the analog dimming conversion circuit outputting an analog dimming output signal to the analog dimming circuit.
  • the first voltage dividing unit can convert the analog dimming input signal with a larger voltage range into the first intermediate voltage with a smaller voltage range, and at the same time
  • the constant voltage unit outputs a constant second intermediate voltage.
  • the second voltage dividing unit divides the first intermediate voltage and the second intermediate voltage, and the voltage value of the output analog dimming output signal is between the first intermediate voltage and the second intermediate voltage, so that the analog dimming output signal
  • the voltage range is within the effective dimming range of the analog dimming (typically 0.5V to 2.5V).
  • the analog dimming conversion circuit provided by the present invention can convert an analog dimming input signal with a large voltage range into an analog dimming output signal with a small voltage range, thereby expanding the dimming range of the analog dimming and improving the simulation. Dimming dimming ability.
  • FIG. 1 is a schematic diagram of an analog dimming conversion circuit according to an embodiment of the present invention.
  • FIG. 2 is a circuit diagram of an analog dimming conversion circuit according to an embodiment of the present invention.
  • Embodiments of the present invention provide an analog dimming conversion circuit for increasing the dimming range of analog dimming of a display device.
  • the analog dimming conversion circuit includes a first voltage dividing unit, a second voltage dividing unit, and a constant voltage unit.
  • the input end of the first voltage dividing unit receives the analog dimming input signal VADIM, converts the VADIM with a larger voltage range into the first intermediate voltage V1 with a smaller voltage range, and outputs the second intermediate point from the output end of the first voltage dividing unit Press unit output.
  • a constant second intermediate voltage V2 is generated in the constant voltage unit and output from the output terminal of the constant voltage unit to the second voltage dividing unit.
  • the first input end and the second input end of the second voltage dividing unit receive V1 and V2, respectively, and divide V1 and V2 to generate an analog dimming output signal ADIM, and output from the output end of the second voltage dividing unit.
  • the voltage of the ADIM is between V1 and V2, allowing the voltage range of the ADIM to be within the effective dimming range of the analog dimming (typically 0.5V to 2.5V).
  • the analog dimming conversion circuit provided by the embodiment of the invention can convert the VADIM with a larger voltage range into the ADIM with a smaller voltage range, thereby expanding the dimming range of the analog dimming and improving the dimming capability of the analog dimming. .
  • FIG. 2 A preferred embodiment of the analog dimming conversion circuit provided by the present invention is shown in FIG. 2, and the present embodiment is applicable to a scene having a 2D/3D conversion function.
  • the output of the second voltage dividing unit is connected with a diode D1
  • the 2D/3D conversion signal 3D_ED is connected to the output end of the second voltage dividing unit through D1.
  • 3D_ED is a low level signal
  • 3D_ED is a high level signal, and its voltage is usually 3.3V.
  • the first voltage dividing unit includes a first resistor and a second resistor connected in series between the input end and the ground, and the first resistor and the second resistor are the output ends of the first voltage dividing unit.
  • the first resistor is connected by R1 in series And R2 composition, R1 resistance is 52k ⁇ , R2 resistance is 62k ⁇ , the total resistance of the first resistance is 114k ⁇ ; the second resistance is composed of R3 and R4 in series, and the resistance values of R3 and R4 are 100k ⁇ , Then the total resistance of the second resistor is 200 k ⁇ .
  • a reference voltage source VREF is further disposed above the first voltage dividing unit, and the first resistor and the second resistor are further connected with filter capacitors C1 and C2.
  • the VADIM input to the first voltage dividing unit ranges from 0V to 3.3V, and can be calculated according to the resistance values of the first resistor and the second resistor, and the size of the V1 output by the first voltage dividing unit is about For 0.64 times VADIM, V1 ranges from 0V to 2.1V.
  • the constant voltage unit includes a reference voltage source VREF, and a third resistor and a fourth resistor connected in series between VREF and the ground, and an output terminal of the constant voltage unit between the third resistor and the fourth resistor.
  • the third resistor is composed of R5 and R6 connected in series, the resistance values of R5 and R6 are both 91k ⁇ , and the total resistance of the third resistor is 182k ⁇ ;
  • the fourth resistor is composed of R7 and R8 connected in series, R7 and The resistance of R8 is 10k ⁇ , and the total resistance of the fourth resistor is 20k ⁇ .
  • the voltage value of VREF is 5.95V, which can be calculated according to the resistance values of the third resistor and the fourth resistor.
  • a voltage follower may be provided at the output of the first voltage dividing unit and/or the output of the constant voltage unit.
  • two voltage followers are provided by the LM358DR, which are respectively connected to the output end of the first voltage dividing unit and the output end of the constant voltage unit, thereby separating the first voltage dividing unit and the constant voltage unit.
  • the second voltage dividing unit includes a fifth resistor and a sixth resistor connected in series between the first input end and the second input end, and the output end of the second voltage dividing unit is between the fifth resistor and the sixth resistor.
  • the fifth resistor is composed of R9 and R10 connected in series, the resistance of R9 is 41k ⁇ , the resistance of R10 is 42k ⁇ , and the total resistance of the fifth resistor is 83k ⁇ ; the sixth resistor is connected by R11 and R12 in series. Composition, R11 has a resistance of 7k ⁇ , R12 has a resistance of 8k ⁇ , and the sixth resistor has a total resistance of 15k ⁇ .
  • R13 in parallel with R9 and R10, and R14 in parallel with R11 and R12.
  • the resistance values of R13 and R14 are both 1M ⁇ , and whether R13 is connected in parallel with R9 and R10 through the switch, whether R14 and R11 will be used.
  • R12 is connected in parallel to fine-tune the resistance values of the fifth resistor and the sixth resistor to adjust the size of the ADIM output by the second voltage dividing unit.
  • the range of the ADIM output by the second voltage dividing unit is between 0.504V and 0.840V.
  • VADIM V1, V2 and ADIM are shown in Table 1.
  • the analog dimming conversion circuit provided by the embodiment of the present invention can convert VADIM of 0V to 3.3V into ADIM of 0.504V to 0.840V in the 2D mode, so that the voltage range of the ADIM is within the effective dimming range of the analog dimming.
  • the dimming range of the analog dimming is expanded to 0V to 3.3V, which improves the dimming capability of the analog dimming.
  • the resistance values of the respective resistors in the first voltage dividing unit, the second voltage dividing unit, and the constant voltage unit may be adjusted accordingly, so that the ADIM obtains a more suitable voltage range to adapt to different simulations. Adjust the scene to get different analog voltage regulation accuracy.
  • 3D_ED is a high level signal of 3.3V, and 3D_ED passes directly through D1 as an ADIM output.
  • D1 can use a diode with a voltage drop of about 0.4V, and the size of the ADIM is about 2.9V.
  • the embodiment of the invention further provides a display device comprising an analog dimming circuit and an analog dimming conversion circuit provided by the above embodiments.
  • the analog dimming conversion circuit receives the analog dimming input signal VADIM, converts the VADIM into an analog dimming output signal ADIM, and outputs the ADIM to the analog dimming circuit.
  • the analog dimming circuit then simulates dimming the backlight of the display device based on the ADIM.
  • the display device provided by the embodiment of the present invention has the same technical features as the analog dimming conversion circuit provided by the above embodiment, the same technical problem can be solved and the same technical effect can be achieved.

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Abstract

一种模拟调光转换电路及显示装置，属于显示技术领域，解决了现有的模拟调光技术存在调光能力较差的技术问题。该模拟调光转换电路，包括第一分压单元、第二分压单元和恒压单元；第一分压单元的输入端接收模拟调光输入信号，第一分压单元的输出端输出第一中间电压；恒压单元的输出端输出恒定的第二中间电压；第二分压单元的第一输入端和第二输入端分别接收第一中间电压和第二中间电压，第二分压单元的输出端输出模拟调光输出信号。本发明可用于液晶电视、液晶显示器、手机、平板电脑等具有模拟调光功能的显示装置。

Description

模拟调光转换电路及显示装置
本申请要求享有2014年10月20日提交的名称为“模拟调光转换电路及显示装置”的中国专利申请CN201410559611.X的优先权，其全部内容通过引用并入本文中。
技术领域
本发明涉及显示技术领域，具体地说，涉及一种模拟调光转换电路及显示装置。
背景技术
随着显示技术的发展，液晶显示器已经成为最为常见的显示设备。目前，越来越多的液晶显示器中采用白色发光二极管(Light-Emitting Diode，简称LED)作为背光源，并且很多产品设计者希望LED的亮度能够在不同的应用场合中发生相应的变化，因此LED的驱动器需要具备亮度调节功能。
模拟调光(Analog Dimming，简称ADIM)技术相比于传统的脉宽调光(PWM Dimming)技术，具有无噪音等优点。但是，现有的模拟调光技术能支持的调光范围较窄，通常只能在调光信号大小为0.5V至2.5V之间进行线性调光，如果调光信号为0V至0.5V或大于2.5V，则不能进行模拟调光。而在显示过程中，调光信号大小通常在0V至3.3V之间，现有的模拟调光技术由于调光范围较窄，因此存在调光能力较差的技术问题。
发明内容
本发明的目的在于提供一种模拟调光转换电路及显示装置，以解决现有的模拟调光技术存在调光能力较差的技术问题。
本发明提供一种模拟调光转换电路，包括第一分压单元、第二分压单元和恒压单元；
所述第一分压单元的输入端接收模拟调光输入信号，所述第一分压单元的输出端输出第一中间电压；
所述恒压单元的输出端输出恒定的第二中间电压；
所述第二分压单元的第一输入端和第二输入端分别接收所述第一中间电压和所述第二中间电压，所述第二分压单元的输出端输出模拟调光输出信号。
进一步，所述第二分压单元的输出端连接有二极管，2D/3D转换信号通过所述二极管连接至所述第二分压单元的输出端。
进一步，所述第一分压单元的输出端和/或所述恒压单元的输出端设置有电压跟随器。
优选的，所述第一分压单元中包括串联于输入端与地线之间的第一电阻和第二电阻，所述第一电阻与所述第二电阻之间为所述第一分压单元的输出端。优选的，所述第一电阻为114kΩ，所述第二电阻为200kΩ，所述模拟调光输入信号的范围在0V至3.3V之间。
优选的，所述恒压单元中包括基准电压源以及串联于所述基准电压源与地线之间的第三电阻和第四电阻，所述第三电阻与所述第四电阻之间为所述恒压单元的输出端。优选的，所述第三电阻为182kΩ，所述第四电阻为20kΩ。
优选的，所述第二分压单元中包括串联于第一输入端与第二输入端之间的第五电阻和第六电阻，所述第五电阻与所述第六电阻之间为所述第二分压单元的输出端。优选的，所述第五电阻为83kΩ，所述第六电阻为15kΩ。
本发明还提供一种显示装置，包括模拟调光电路和上述的模拟调光转换电路，所述模拟调光转换电路向所述模拟调光电路输出模拟调光输出信号。
本发明带来了以下有益效果：本发明提供的模拟调光转换电路中，第一分压单元能够将电压范围较大的模拟调光输入信号转换为电压范围较小的第一中间电压，同时恒压单元输出恒定的第二中间电压。第二分压单元对第一中间电压和第二中间电压进行分压，所输出的模拟调光输出信号的电压值介于第一中间电压与第二中间电压之间，使模拟调光输出信号的电压范围在模拟调光的有效调光范围之内(通常为0.5V至2.5V)。因此，本发明提供的模拟调光转换电路能够将电压范围较大的模拟调光输入信号转换为电压范围较小的模拟调光输出信号，从而扩大了模拟调光的调光范围，提高了模拟调光的调光能力。
本发明的其它特征和优点将在随后的说明书中阐述，并且，部分地从说明书中变得显而易见，或者通过实施本发明而了解。本发明的目的和其他优点可通过在说明书、权利要求书以及附图中所特别指出的结构来实现和获得。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要的附图做简单的介绍：
图1是本发明实施例提供的模拟调光转换电路的示意图；
图2是本发明实施例提供的模拟调光转换电路的电路图。
具体实施方式
以下将结合附图及实施例来详细说明本发明的实施方式，借此对本发明如何应用技术手段来解决技术问题，并达成技术效果的实现过程能充分理解并据以实施。需要说明的是，只要不构成冲突，本发明中的各个实施例以及各实施例中的各个特征可以相互结合，所形成的技术方案均在本发明的保护范围之内。
本发明实施例提供一种模拟调光转换电路，用于增大显示装置模拟调光的调光范围。
如图1所示，该模拟调光转换电路包括第一分压单元、第二分压单元和恒压单元。
第一分压单元的输入端接收模拟调光输入信号VADIM，将电压范围较大的VADIM转换为电压范围较小的第一中间电压V1，并从第一分压单元的输出端向第二分压单元输出。恒压单元中产生一个恒定的第二中间电压V2，并从恒压单元的输出端向第二分压单元输出。
第二分压单元的第一输入端和第二输入端分别接收V1和V2，对V1和V2进行分压，生成模拟调光输出信号ADIM，并从第二分压单元的输出端输出。该ADIM的电压值介于V1与V2之间，使ADIM的电压范围在模拟调光的有效调光范围之内(通常为0.5V至2.5V)。
因此，本发明实施例提供的模拟调光转换电路能够将电压范围较大的VADIM转换为电压范围较小的ADIM，从而扩大了模拟调光的调光范围，提高了模拟调光的调光能力。
本发明提供的模拟调光转换电路的一个优选实施例如图2所示，本实施例适用于具有2D/3D转换功能的场景中。其中，第二分压单元的输出端连接有二极管D1，2D/3D转换信号3D_ED通过D1连接至第二分压单元的输出端。在2D模式时，3D_ED为低电平信号；在3D模式时，3D_ED为高电平信号，其电压通常为3.3V。
如图2所示，第一分压单元中包括串联于输入端与地线之间的第一电阻和第二电阻，第一电阻与第二电阻之间为第一分压单元的输出端。本实施例中，第一电阻由串联的R1 和R2组成，R1的阻值为52kΩ，R2的阻值为62kΩ，则第一电阻的总阻值为114kΩ；第二电阻由串联的R3和R4组成，R3和R4的阻值均为100kΩ，则第二电阻的总阻值为200kΩ。此外，第一分压单元上方还设置有基准电压源VREF，第一电阻和第二电阻还并联有滤波电容C1、C2。
在2D模式时，输入第一分压单元的VADIM的范围在0V至3.3V之间，根据第一电阻和第二电阻的阻值可以计算得出，第一分压单元输出的V1的大小约为VADIM的0.64倍，则V1的范围在0V至2.1V之间。
恒压单元中包括基准电压源VREF，以及串联于VREF与地线之间的第三电阻和第四电阻，第三电阻与第四电阻之间为恒压单元的输出端。本实施例中，第三电阻由串联的R5和R6组成，R5和R6的阻值均为91kΩ，则第三电阻的总阻值为182kΩ；第四电阻由串联的R7和R8组成，R7和R8的阻值均为10kΩ，则第四电阻的总阻值为20kΩ。
VREF的电压值为5.95V，根据第三电阻和第四电阻的阻值可以计算得出，恒压单元输出的V2的大小约为VREF的0.1倍，则V2＝0.6V。
进一步，第一分压单元的输出端和/或恒压单元的输出端还可以设置电压跟随器。本实施例中，利用LM358DR提供两个电压跟随器，分别连接在第一分压单元的输出端和恒压单元的输出端，从而对第一分压单元和恒压单元起到隔离作用。
第二分压单元中包括串联于第一输入端与第二输入端之间的第五电阻和第六电阻，第五电阻与第六电阻之间为第二分压单元的输出端。本实施例中，第五电阻由串联的R9和R10组成，R9的阻值为41kΩ，R10的阻值为42kΩ，则第五电阻的总阻值为83kΩ；第六电阻由串联的R11和R12组成，R11的阻值为7kΩ，R12的阻值为8kΩ，则第六电阻的总阻值为15kΩ。另外，还可以设置与R9、R10并联的R13，以及与R11、R12并联的R14，R13和R14的阻值均为1MΩ，并通过开关选择是否将R13与R9、R10并联，是否将R14与R11、R12并联，从而对第五电阻和第六电阻的阻值进行微调，以便于调节第二分压单元输出的ADIM的大小。
根据第五电阻和第六电阻的阻值可以计算得出，第二分压单元输出的ADIM的范围在0.504V至0.840V之间。
VADIM、V1、V2及ADIM的变化情况如表1所示。
VADIM(V) V1(V) V2(V) ADIM(V)
0 0 0.6 0.504
1 0.636 0.6 0.606
2 1.273 0.6 0.708
3.3 2.1 0.6 0.840
表1
本发明实施例提供的模拟调光转换电路在2D模式时，能够将0V至3.3V的VADIM转换为0.504V至0.840V的ADIM，使ADIM的电压范围在模拟调光的有效调光范围之内，从而将模拟调光的调光范围扩大为0V至3.3V，提高了模拟调光的调光能力。
在其他实施方式中，可以将第一分压单元、第二分压单元和恒压单元中的各个电阻的阻值进行相应调整，从而使ADIM获得更为合适的电压范围，以适应不同的模拟调压场景，得到不同的模拟调压精度。
在3D模式时，3D_ED为3.3V的高电平信号，3D_ED直接经过D1作为ADIM输出。其中，D1可选用压降为0.4V左右的二极管，则ADIM的大小为2.9V左右。
本发明实施例还提供一种显示装置，包括模拟调光电路和上述实施例提供的模拟调光转换电路。模拟调光转换电路接收模拟调光输入信号VADIM，将VADIM转换为模拟调光输出信号ADIM，并向模拟调光电路输出ADIM。然后，模拟调光电路根据ADIM对显示装置的背光源进行模拟调光。
因为本发明实施例提供的显示装置与上述实施例提供的模拟调光转换电路具有相同的技术特征，所以也能解决相同的技术问题，达到相同的技术效果。
虽然本发明所公开的实施方式如上，但所述的内容只是为了便于理解本发明而采用的实施方式，并非用以限定本发明。任何本发明所属技术领域内的技术人员，在不脱离本发明所公开的精神和范围的前提下，可以在实施的形式上及细节上作任何的修改与变化，但本发明的专利保护范围，仍须以所附的权利要求书所界定的范围为准。

Claims (10)

  1. 一种模拟调光转换电路，包括第一分压单元、第二分压单元和恒压单元；
    所述第一分压单元的输入端接收模拟调光输入信号，所述第一分压单元的输出端输出第一中间电压；
    所述恒压单元的输出端输出恒定的第二中间电压；
    所述第二分压单元的第一输入端和第二输入端分别接收所述第一中间电压和所述第二中间电压，所述第二分压单元的输出端输出模拟调光输出信号。
  2. 如权利要求1所述的模拟调光转换电路，其中，所述第二分压单元的输出端连接有二极管，2D/3D转换信号通过所述二极管连接至所述第二分压单元的输出端。
  3. 如权利要求1所述的模拟调光转换电路，其中，所述第一分压单元的输出端和/或所述恒压单元的输出端设置有电压跟随器。
  4. 如权利要求1所述的模拟调光转换电路，其中，所述第一分压单元中包括串联于输入端与地线之间的第一电阻和第二电阻，所述第一电阻与所述第二电阻之间为所述第一分压单元的输出端。
  5. 如权利要求4所述的模拟调光转换电路，其中，所述第一电阻为114kΩ，所述第二电阻为200kΩ，所述模拟调光输入信号的范围在0V至3.3V之间。
  6. 如权利要求1所述的模拟调光转换电路，其中，所述恒压单元中包括基准电压源以及串联于所述基准电压源与地线之间的第三电阻和第四电阻，所述第三电阻与所述第四电阻之间为所述恒压单元的输出端。
  7. 如权利要求6所述的模拟调光转换电路，其中，所述第三电阻为182kΩ，所述第四电阻为20kΩ。
  8. 如权利要求1所述的模拟调光转换电路，其中，所述第二分压单元中包括串联于第一输入端与第二输入端之间的第五电阻和第六电阻，所述第五电阻与所述第六电阻之间为所述第二分压单元的输出端。
  9. 如权利要求8所述的模拟调光转换电路，其中，所述第五电阻为83kΩ，所述第六电阻为15kΩ。
  10. 一种显示装置，包括模拟调光电路和模拟调光转换电路，所述模拟调光转换电路 向所述模拟调光电路输出模拟调光输出信号；
    所述模拟调光转换电路，包括第一分压单元、第二分压单元和恒压单元；所述第一分压单元的输入端接收模拟调光输入信号，所述第一分压单元的输出端输出第一中间电压；所述恒压单元的输出端输出恒定的第二中间电压；所述第二分压单元的第一输入端和第二输入端分别接收所述第一中间电压和所述第二中间电压，所述第二分压单元的输出端输出模拟调光输出信号。
PCT/CN2014/090036 2014-10-20 2014-10-31 模拟调光转换电路及显示装置 Ceased WO2016061845A1 (zh)

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