WO2020215450A1 - 电压转换电路 - Google Patents

电压转换电路 Download PDF

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Publication number
WO2020215450A1
WO2020215450A1 PCT/CN2019/090035 CN2019090035W WO2020215450A1 WO 2020215450 A1 WO2020215450 A1 WO 2020215450A1 CN 2019090035 W CN2019090035 W CN 2019090035W WO 2020215450 A1 WO2020215450 A1 WO 2020215450A1
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Prior art keywords
low voltage
constant low
voltage
conversion circuit
operational amplifier
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PCT/CN2019/090035
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English (en)
French (fr)
Inventor
赵贤平
刘金风
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深圳市华星光电技术有限公司
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Publication of WO2020215450A1 publication Critical patent/WO2020215450A1/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
    • G09G3/36—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 using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3674—Details of drivers for scan electrodes
    • G09G3/3677—Details of drivers for scan electrodes suitable for active matrices only

Definitions

  • the present invention relates to the field of display technology, and in particular to a voltage conversion circuit.
  • LCD Liquid Crystal Display
  • PDA personal digital assistant
  • LCD TV mobile phone
  • PDA personal digital assistant
  • digital camera computer screen or notebook computer screen, etc.
  • GOA Gate Driver on Array
  • TFT Thin Film Transistor
  • the driving method has the advantages of reducing production costs and realizing the narrow frame design of the panel, and is used by a variety of displays.
  • the GOA circuit has two basic functions: the first is to output the gate scan driving signal, which drives the gate line in the panel, and turns on the TFT in the display area to charge the pixels; the second is the shift register function, which acts as a gate After the output of the pole scan drive signal is completed, the next gate scan drive signal is output through clock control, and is passed on in sequence.
  • GOA technology can reduce the bonding process of external chips (IC), which has the opportunity to increase production capacity and reduce product costs, and it can make LCD panels more suitable for manufacturing display products with narrow bezels.
  • the GOA circuit needs to be connected to two different first constant low voltage and second constant low voltage.
  • the first constant low voltage is used to pull down the first node of the GOA circuit that controls the pull-up module to pull up the scan signal.
  • the second constant low voltage is used to pull down the potential of the scan signal, and the first constant low voltage is generally lower than the second constant low voltage.
  • a conversion circuit is generally used to convert the first constant low voltage to obtain the second constant low voltage.
  • the object of the present invention is to provide a voltage conversion circuit with strong driving capability, which can eliminate the second constant low voltage drift caused by the leakage path of the display panel, and make the second constant low voltage stable.
  • the present invention provides a voltage conversion circuit, including a power management unit, an operational amplifier, and a level conversion unit; the input end of the power management unit is connected to a first constant low voltage, and the output end is electrically connected to the operational amplifier
  • the inverting input terminal of the operational amplifier is electrically connected to its output terminal, and the output terminal is electrically connected to the input terminal of the level conversion unit; the output terminal of the level conversion unit is used for It is electrically connected to the display panel and outputs a second constant low voltage.
  • the first constant low voltage is less than the second constant low voltage, and both the first constant low voltage and the second constant low voltage are less than zero.
  • the first constant low voltage is -10V to -10.5V
  • the second constant low voltage is -5.5V to -6.5V.
  • the power management unit is integrated in a power management chip.
  • the power management unit and the operational amplifier are integrated in the same power management chip.
  • the power management unit includes a triode, the emitter of the triode is the input end of the power management unit, the collector is the output end of the power management unit, and the base is connected to a control signal.
  • the voltage conversion circuit further includes a resistor and a capacitor.
  • One end of the resistor is electrically connected to the output terminal of the operational amplifier, and the other end is grounded; one end of the capacitor is electrically connected to the output terminal of the operational amplifier, and the other end is grounded.
  • the positive power supply pin of the operational amplifier is connected to the positive power supply voltage, and the negative power supply pin is connected to the first constant low voltage.
  • the display panel includes a GOA circuit, and the output terminal of the level conversion unit is electrically connected to the GOA circuit.
  • the maximum value of the current at the output terminal of the level conversion unit ranges from 50 mA to 60 mA.
  • the voltage conversion circuit of the present invention includes a power management unit, an operational amplifier, and a level conversion unit.
  • the input end of the power management unit is connected to the first constant low voltage, and the output end is electrically connected to the non-inverting input end of the operational amplifier And output a constant low voltage
  • the inverting input terminal of the operational amplifier is electrically connected to its output terminal
  • the output terminal is electrically connected to the input terminal of the level conversion unit
  • the output terminal of the level conversion unit is electrically connected to the display panel and outputs the second Constant low voltage
  • the voltage conversion circuit has strong driving ability, and can eliminate the second constant low voltage drift caused by the leakage path of the display panel, so that the second constant low voltage is stable.
  • 1 is a schematic diagram of the structure of the first embodiment of the voltage conversion circuit of the present invention.
  • FIG. 2 is a schematic structural diagram of a second embodiment of the voltage conversion circuit of the present invention.
  • the voltage conversion circuit of the first embodiment of the present invention includes a power management unit 10, an operational amplifier (OP) 20 and a level conversion unit 30.
  • the input terminal of the power management unit 10 is connected to the first constant low voltage VSSQ, and the output terminal is electrically connected to the non-inverting input terminal of the operational amplifier 20 and outputs an intermediate constant low voltage VSS.
  • the inverting input terminal of the operational amplifier 20 is electrically connected to its output terminal, and the output terminal is electrically connected to the input terminal of the level conversion unit 30.
  • the output terminal of the level conversion unit 30 is used to electrically connect to the display panel 9.
  • the level conversion unit 30 converts the voltage received at its input terminal to generate a second constant low voltage VSSG and outputs it from its output terminal.
  • the first constant low voltage VSSQ is less than the second constant low voltage VSSG, and both the first constant low voltage VSSQ and the second constant low voltage VSSG are less than zero.
  • the first constant low voltage VSSQ is -10V ⁇ -10.5V, preferably -10.2V
  • the second constant low voltage VSSG is -5.5V ⁇ -6.5V.
  • the maximum value of the current at the output terminal of the level conversion unit 30 ranges from 50 mA to 60 mA.
  • the power management unit 10 is integrated in a power management chip (PMIC) 8, and the operational amplifier 20 is independently provided outside the power management chip 8.
  • PMIC power management chip
  • the power management unit 10 includes a transistor Q1, the emitter of the transistor Q1 is the input terminal of the power management unit 10, the collector is the output terminal of the power management unit 10, the base is connected to the control signal CS, and the transistor Q1 Under the control of the control signal CS, the first constant low voltage VSSQ is converted to generate an intermediate constant low voltage VSS and output.
  • the voltage conversion circuit further includes a resistor R1 and a capacitor C1.
  • One end of the resistor R1 is electrically connected to the output end of the operational amplifier 20, and the other end is grounded.
  • One end of the capacitor C1 is electrically connected to the output end of the operational amplifier 20, and the other end is grounded.
  • the positive power supply pin of the operational amplifier 20 is connected to the positive power supply voltage VDD, and the negative power supply pin is connected to the first constant low voltage VSSQ.
  • the power supply positive voltage VDD has a voltage value of 3.3V.
  • the display panel 9 includes a GOA circuit 91, and the output terminal of the level conversion unit 30 is electrically connected to the GOA circuit 91.
  • the voltage conversion circuit of the first embodiment of the present invention connects an operational amplifier 20 to the output terminal of the power management unit 10 integrated in the power management chip 8, so that the non-inverting input terminal of the operational amplifier 20 is connected to the power management
  • the output terminal of the unit 10, the inverting input terminal and the output terminal are connected, and the output terminal is connected to the input terminal of the level conversion unit 30, which can significantly increase the maximum value of the current at the output terminal of the level conversion unit 30, thereby making the voltage conversion circuit drive The ability is greatly enhanced.
  • the voltage conversion circuit of the present invention can be used in the display panel 9 where the leakage path of the GOA circuit 91 cannot In the case of elimination, the problem of the drift of the second constant low voltage VSSG caused by the existence of the leakage path can be effectively solved at a very low cost, so that the second constant low voltage VSSG is stable, and the GOA circuit 91 in the display panel 9 is normal. jobs.
  • the difference between the voltage conversion circuit of the second embodiment of the present invention and the above-mentioned first embodiment is that the power management unit 10 and the operational amplifier 20 are integrated in the same power management chip 8', and the rest are the same as those of the first embodiment.
  • the embodiments are the same, and will not be repeated here.
  • the second embodiment integrates the power management unit 10 and the operational amplifier 20 into the same power management chip 8', which makes the circuit structure of the second embodiment simpler, can significantly improve the integration of the circuit and improve the quality of the product.
  • the voltage conversion circuit of the present invention includes a power management unit, an operational amplifier, and a level conversion unit.
  • the input terminal of the power management unit is connected to the first constant low voltage, and the output terminal is electrically connected to the non-inverting input terminal of the operational amplifier.
  • Output the intermediate constant low voltage, the inverting input terminal of the operational amplifier is electrically connected to its output terminal, the output terminal is electrically connected to the input terminal of the level conversion unit, and the output terminal of the level conversion unit is electrically connected to the display panel and outputs the second constant Low voltage
  • the voltage conversion circuit has strong driving ability, and can eliminate the second constant low voltage drift caused by the leakage path of the display panel, so that the second constant low voltage is stable.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

电压转换电路包括电源管理单元（10）、运算放大器（20）及电平转换单元（30），电源管理单元（10）的输入端接入第一恒定低电压，输出端电性连接运算放大器（20）的同相输入端并输出中间恒定低电压，运算放大器（20）的反相输入端电性连接其输出端，输出端电性连接电平转换单元（30）的输入端，电平转换单元（30）的输出端电性连接显示面板（9）并输出第二恒定低电压，该电压转换电路的驱动能力强，能够消除由于显示面板（9）存在漏电路径导致的第二恒定低电压漂移，使得第二恒定低电压稳定。

Description

电压转换电路 技术领域
本发明涉及显示技术领域，尤其涉及一种电压转换电路。
 背景技术
液晶显示器（Liquid Crystal Display，LCD）具有机身薄、省电、无辐射等众多优点，得到了广泛的应用。如：液晶电视、移动电话、个人数字助理（PDA）、数字相机、计算机屏幕或笔记本电脑屏幕等，在平板显示领域中占主导地位。
GOA（Gate Driver on Array）技术即阵列基板行驱动技术，是利用薄膜晶体管（Thin Film Transistor，TFT）液晶显示器阵列制程将栅极扫描驱动电路制作在薄膜晶体管阵列基板上，以实现逐行扫描的驱动方式，具有降低生产成本和实现面板窄边框设计的优点，为多种显示器所使用。GOA电路具有两项基本功能：第一是输出栅极扫描驱动信号，驱动面板内的栅极线，打开显示区内的TFT，以对像素进行充电；第二是移位寄存功能，当一个栅极扫描驱动信号输出完成后，通过时钟控制进行下一个栅极扫描驱动信号的输出，并依次传递下去。GOA技术能减少外接芯片（IC）的焊接（bonding）工序，有机会提升产能并降低产品成本，而且可以使液晶显示面板更适合制作窄边框的显示产品。
现有技术中，GOA电路需要接入两个不同的第一恒定低电压及第二恒定低电压，第一恒定低电压用于下拉GOA电路中控制上拉模块上拉扫描信号的第一节点的电位，第二恒定低电压用于下拉扫描信号的电位，第一恒定低电压一般低于第二恒定低电压。目前，一般利用转换电路对第一恒定低电压进行转换从而得到第二恒定低电压。由于制程原因，GOA电路中存在由第一恒定低电压到第二恒定低电压的漏电路径，会导致第二恒定低电压被拉低而偏离设计值（例如从设计值-6V偏离至-8.9V），会严重影响电路的功能，影响产品的品质。
 技术问题
本发明的目的在于提供一种电压转换电路，驱动能力强，能够消除由于显示面板存在漏电路径导致的第二恒定低电压漂移，使得第二恒定低电压稳定。
 技术解决方案
为实现上述目的，本发明提供一种电压转换电路，包括电源管理单元、运算放大器及电平转换单元；所述电源管理单元的输入端接入第一恒定低电压，输出端电性连接运算放大器的同相输入端并输出中间恒定低电压；所述运算放大器的反相输入端电性连接其输出端，输出端电性连接电平转换单元的输入端；所述电平转换单元的输出端用于电性连接显示面板并输出第二恒定低电压。
所述第一恒定低电压小于第二恒定低电压，所述第一恒定低电压及第二恒定低电压均小于0。
所述第一恒定低电压为-10V~-10.5V，所述第二恒定低电压为-5.5V~-6.5V。
所述电源管理单元集成于一电源管理芯片内。
所述电源管理单元及运算放大器集成于同一电源管理芯片内。
所述电源管理单元包括三极管，所述三极管的发射极为电源管理单元的输入端，集电极为电源管理单元的输出端，基极接入控制信号。
所述电压转换电路还包括电阻及电容，所述电阻的一端电性连接运算放大器的输出端，另一端接地；所述电容的一端电性连接运算放大器的输出端，另一端接地。
所述运算放大器的正电源引脚接入电源正电压，负电源引脚接入第一恒定低电压。
所述显示面板包括GOA电路，所述电平转换单元的输出端电性连接GOA电路。
所述电平转换单元的输出端的电流的最大值的范围为50mA~60mA。
 有益效果
本发明的有益效果：本发明的电压转换电路包括电源管理单元、运算放大器及电平转换单元，电源管理单元的输入端接入第一恒定低电压，输出端电性连接运算放大器的同相输入端并输出中间恒定低电压，运算放大器的反相输入端电性连接其输出端，输出端电性连接电平转换单元的输入端，电平转换单元的输出端电性连接显示面板并输出第二恒定低电压，该电压转换电路的驱动能力强，能够消除由于显示面板存在漏电路径导致的第二恒定低电压漂移，使得第二恒定低电压稳定。
 附图说明
为了能更进一步了解本发明的特征以及技术内容，请参阅以下有关本发明的详细说明与附图，然而附图仅提供参考与说明用，并非用来对本发明加以限制。
附图中，
图1为本发明的电压转换电路的第一实施例的结构示意图；
图2为本发明的电压转换电路的第二实施例的结构示意图。
 本发明的实施方式
为更进一步阐述本发明所采取的技术手段及其效果，以下结合本发明的优选实施例及其附图进行详细描述。
请参阅图1，本发明第一实施例的电压转换电路包括电源管理单元10、运算放大器（OP）20及电平转换单元30。所述电源管理单元10的输入端接入第一恒定低电压VSSQ，输出端电性连接运算放大器20的同相输入端并输出中间恒定低电压VSS。所述运算放大器20的反相输入端电性连接其输出端，输出端电性连接电平转换单元30的输入端。所述电平转换单元30的输出端用于电性连接显示面板9，该电平转换单元30将其输入端接收到的电压进行转换后产生第二恒定低电压VSSG并由其输出端输出。
具体地，所述第一恒定低电压VSSQ小于第二恒定低电压VSSG，所述第一恒定低电压VSSQ及第二恒定低电压VSSG均小于0。
进一步地，所述第一恒定低电压VSSQ为-10V~-10.5V，优选为-10.2V，所述第二恒定低电压VSSG为-5.5V~-6.5V。
具体地，所述电平转换单元30的输出端的电流的最大值的范围为50mA~60mA。
具体地，请参阅图1，在本发明的第一实施例中，所述电源管理单元10集成于一电源管理芯片（PMIC）8内，而运算放大器20独立设于电源管理芯片8外。
具体地，所述电源管理单元10包括三极管Q1，所述三极管Q1的发射极为电源管理单元10的输入端，集电极为电源管理单元10的输出端，基极接入控制信号CS，该三极管Q1受控制信号CS的控制对第一恒定低电压VSSQ进行转换产生中间恒定低电压VSS并输出。
具体地，所述电压转换电路还包括电阻R1及电容C1，所述电阻R1的一端电性连接运算放大器20的输出端，另一端接地。所述电容C1的一端电性连接运算放大器20的输出端，另一端接地。
具体地，所述运算放大器20的正电源引脚接入电源正电压VDD，负电源引脚接入第一恒定低电压VSSQ。优选地，电源正电压VDD的电压值为3.3V。
具体地，所述显示面板9包括GOA电路91，所述电平转换单元30的输出端电性连接GOA电路91。
需要说明的是，本发明第一实施例的电压转换电路通过在集成于电源管理芯片8内的电源管理单元10的输出端连接一个运算放大器20，使得该运算放大器20的同相输入端连接电源管理单元10的输出端，反相输入端与输出端连接，输出端连接电平转换单元30的输入端，能够显著提升电平转换单元30输出端的电流的最大值，从而使得该电压转换电路的驱动能力大大增强，经实验计算，当第一恒定低电压VSSQ为-10.2V时，本发明中电平转换单元30输出端的电流的最大值为53mA，驱动能力较强，使得第二恒定低电压VSSG稳定在-6.06V，而现有技术的用于将第一恒定低电压转换为第二恒定低电压的转换电路中，在第一恒定低电压为-10.2V时，电路的输出端的电流为25.2mA，驱动能力较弱，由于GOA电路中存在漏电，第二恒定低电压会被拉低至-8.96V，从而，本发明的电压转换电路能够在显示面板9中的GOA电路91的漏电路径无法消除的情况下，利用很低的成本即可有效解决由于漏电路径存在导致的第二恒定低电压VSSG漂移的问题，使得第二恒定低电压VSSG稳定，保证显示面板9中的GOA电路91的正常工作。
请参阅图2，本发明第二实施例的电压转换电路与上述第一实施例的区别在于，所述电源管理单元10及运算放大器20集成于同一电源管理芯片8’内，其余均与第一实施例相同，在此不再赘述。该第二实施例由于将电源管理单元10及运算放大器20集成于同一电源管理芯片8’内，使得该第二实施例的电路结构更加简单，能够显著提升电路的集成性，提升产品的品质。
综上所述，本发明的电压转换电路包括电源管理单元、运算放大器及电平转换单元，电源管理单元的输入端接入第一恒定低电压，输出端电性连接运算放大器的同相输入端并输出中间恒定低电压，运算放大器的反相输入端电性连接其输出端，输出端电性连接电平转换单元的输入端，电平转换单元的输出端电性连接显示面板并输出第二恒定低电压，该电压转换电路的驱动能力强，能够消除由于显示面板存在漏电路径导致的第二恒定低电压漂移，使得第二恒定低电压稳定。
以上所述，对于本领域的普通技术人员来说，可以根据本发明的技术方案和技术构思作出其他各种相应的改变和变形，而所有这些改变和变形都应属于本发明权利要求的保护范围。

Claims (10)

  1. 一种电压转换电路，包括电源管理单元、运算放大器及电平转换单元；所述电源管理单元的输入端接入第一恒定低电压，输出端电性连接运算放大器的同相输入端并输出中间恒定低电压；所述运算放大器的反相输入端电性连接其输出端，输出端电性连接电平转换单元的输入端；所述电平转换单元的输出端用于电性连接显示面板并输出第二恒定低电压。
  2. 如权利要求1所述的电压转换电路，其中，所述第一恒定低电压小于第二恒定低电压，所述第一恒定低电压及第二恒定低电压均小于0。
  3. 如权利要求2所述的电压转换电路，其中，所述第一恒定低电压为-10V~-10.5V，所述第二恒定低电压为-5.5V~-6.5V。
  4. 如权利要求1所述的电压转换电路，其中，所述电源管理单元集成于一电源管理芯片内。
  5. 如权利要求1所述的电压转换电路，其中，所述电源管理单元及运算放大器集成于同一电源管理芯片内。
  6. 如权利要求1所述的电压转换电路，其中，所述电源管理单元包括三极管，所述三极管的发射极为电源管理单元的输入端，集电极为电源管理单元的输出端，基极接入控制信号。
  7. 如权利要求1所述的电压转换电路，还包括电阻及电容，所述电阻的一端电性连接运算放大器的输出端，另一端接地；所述电容的一端电性连接运算放大器的输出端，另一端接地。
  8. 如权利要求1所述的电压转换电路，其中，所述运算放大器的正电源引脚接入电源正电压，负电源引脚接入第一恒定低电压。
  9. 如权利要求1所述的电压转换电路，其中，所述显示面板包括GOA电路，所述电平转换单元的输出端电性连接GOA电路。
  10. 如权利要求1所述的电压转换电路，其中，所述电平转换单元的输出端的电流的最大值的范围为50mA~60mA。
PCT/CN2019/090035 2019-04-23 2019-06-04 电压转换电路 WO2020215450A1 (zh)

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