WO2022267165A1 - 参考电压产生电路及其产生方法、显示装置 - Google Patents

参考电压产生电路及其产生方法、显示装置 Download PDF

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Publication number
WO2022267165A1
WO2022267165A1 PCT/CN2021/108648 CN2021108648W WO2022267165A1 WO 2022267165 A1 WO2022267165 A1 WO 2022267165A1 CN 2021108648 W CN2021108648 W CN 2021108648W WO 2022267165 A1 WO2022267165 A1 WO 2022267165A1
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Prior art keywords
voltage
data driving
reference voltage
module
driving voltage
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PCT/CN2021/108648
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English (en)
French (fr)
Inventor
李浩然
肖剑锋
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Tcl华星光电技术有限公司
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Priority to US17/429,337 priority Critical patent/US11538386B1/en
Publication of WO2022267165A1 publication Critical patent/WO2022267165A1/zh

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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
    • G05F1/561—Voltage to current converters

Definitions

  • the present application relates to the field of display technology, in particular to a reference voltage generation circuit, a generation method thereof, and a display device.
  • the drive circuit board of the display panel integrates PM IC (power management integrated circuit), GAMMA IC (gamma correction chip) and Level shift (shift circuit).
  • PM IC is used to generate AVDD voltage, VCOM voltage, VGL voltage and VGH voltage, wherein, VCOM voltage (common voltage) is generated by AVDD voltage, and GAMMA IC generates multiple sets of GAMMA voltage (gamma voltage) under the action of AVDD voltage.
  • VCOM voltage includes multiple types, such as CF VCOM (common voltage of color filter substrate), AVCOM (common voltage of array substrate), etc.
  • AVCOM may be higher or lower than reference voltage Vin, but CF VCOM voltage Generally lower than the reference voltage Vin, secondly, a part of the GAMMA voltage is higher than the reference voltage Vin, and another part of the GAMMA voltage is lower than the reference voltage Vin, that is, because various VCOM voltages and multiple groups of GAMMA voltages may be higher than the reference voltage Vin or higher than the reference voltage Vin
  • the reference voltage Vin is low, so the reference voltage Vin is generally raised to the AVDD voltage through a booster circuit, and then the AVDD voltage is divided by series resistors to obtain various VCOM voltages and multiple sets of GAMMA voltages.
  • Fig. 1 is the circuit diagram of the reference voltage generating circuit provided by the prior art, as shown in Fig. 1, the reference voltage includes VCOM voltage and GAMMA voltage, the reference voltage generating circuit 10 of the prior art is mainly composed of a power supply circuit 101 connected in sequence, a rising The voltage sub-circuit 102 and the voltage divider sub-circuit 103 are composed of three parts. First, the power supply sub-circuit 101 provides the reference voltage Vin to the boost sub-circuit 102, and then the boost sub-circuit 102 boosts the reference voltage Vin to the data driving voltage AVDD, Finally, the voltage dividing sub-circuit 103 divides the data driving voltage AVDD into various VCOM voltages and multiple sets of GAMMA voltages.
  • the difference between the data driving voltage AVDD and the VCOM voltage and the GAMMA voltage much lower than the reference voltage Vin The potential difference is relatively large, so that the pressure of the voltage dividing sub-circuit 103 is relatively large and the power loss of the voltage dividing sub-circuit 103 is relatively large, and the driving circuit board itself is highly integrated and the power consumption is concentrated, so this inevitably leads to The temperature inside the driving circuit board is too high, thereby reducing the reliability of the driving circuit board, so as to reduce the service life of the driving circuit board.
  • embodiments of the present application provide a reference voltage generation circuit, a generation method thereof, and a display device.
  • the embodiment of the present application provides a reference voltage generation circuit, the reference voltage generation circuit includes a power supply module, a voltage transformation module and a voltage division module connected in sequence, wherein:
  • the power supply module is used to provide a reference voltage
  • the voltage transforming module is used to provide a first data driving voltage according to the reference voltage, and the first data driving voltage is smaller than the reference voltage;
  • the voltage dividing module is used for generating a reference voltage lower than the first data driving voltage according to the first data driving voltage.
  • the voltage transforming module is also used to provide a second data driving voltage according to the reference voltage, and the second data driving voltage is greater than the reference voltage; the voltage dividing module is also used to provide a second data driving voltage according to the reference voltage The second data driving voltage generates a reference voltage not smaller than the first data driving voltage.
  • the voltage transformation module includes a boost unit and a voltage drop unit connected in parallel, wherein the voltage drop unit is used to generate the first data driving voltage according to the reference voltage, and the voltage boost The unit is used to generate the second data driving voltage according to the reference voltage.
  • the voltage dividing module includes a plurality of resistors connected in series, and the voltage dividing module uses a plurality of resistors connected in series to perform the operation on the second data driving voltage and/or the first data driving voltage. voltage divider to generate the reference voltage.
  • the reference voltage generation circuit further includes a buffer module, the buffer module is connected to the voltage divider module, and the buffer module is used to buffer the reference voltage generated by the voltage divider module and then output .
  • the reference voltage includes a common voltage and/or a gamma voltage.
  • the embodiment of the present application also provides a reference voltage generation method, the reference voltage generation method includes:
  • a reference voltage lower than the first data driving voltage is generated by a voltage dividing module according to the first data driving voltage.
  • the reference voltage generating method further includes:
  • a reference voltage not less than the first data driving voltage is generated by the voltage dividing module according to the second data driving voltage.
  • the voltage transformation module includes a boost unit and a voltage drop unit connected in parallel, and the reference voltage is converted into the first data driving voltage and the second data driving voltage through the voltage transformation module, specifically including:
  • the reference voltage is boosted to the second data driving voltage by the boosting unit.
  • generating a reference voltage not less than the first data driving voltage according to the second data driving voltage, and generating a reference voltage smaller than the first data driving voltage according to the first data driving voltage Specifically include:
  • the first data driving voltage is divided by a plurality of resistors connected in series to obtain a reference voltage lower than the first data driving voltage.
  • the method for generating a reference voltage further includes: buffering the reference voltage generated by the voltage dividing module through a buffer module and outputting it.
  • the embodiment of the present application also provides a display device, which includes a power supply module, a voltage transformation module, and a voltage divider module connected in sequence, wherein:
  • the power supply module is used to provide a reference voltage
  • the voltage transforming module is used to provide a first data driving voltage according to the reference voltage, and the first data driving voltage is smaller than the reference voltage;
  • the voltage dividing module is used for generating a reference voltage lower than the first data driving voltage according to the first data driving voltage.
  • the voltage transforming module is also used to provide a second data driving voltage according to the reference voltage, and the second data driving voltage is greater than the reference voltage; the voltage dividing module is also used to provide a second data driving voltage according to the reference voltage The second data driving voltage generates a reference voltage not smaller than the first data driving voltage.
  • the voltage transformation module includes a boost unit and a voltage drop unit connected in parallel, wherein the voltage drop unit is used to generate the first data driving voltage according to the reference voltage, and the voltage boost The unit is used to generate the second data driving voltage according to the reference voltage.
  • the voltage dividing module includes a plurality of resistors connected in series, and the voltage dividing module uses a plurality of resistors connected in series to control the first data driving voltage and/or the second data driving voltage. voltage divider to generate the reference voltage.
  • the reference voltage generating circuit further includes a buffer module, the buffer module is connected to the voltage dividing module, and the buffer module is used for buffering the reference voltage generated by the voltage dividing module output.
  • the reference voltage includes a common voltage and/or a gamma voltage.
  • the reference voltage generation circuit includes a power supply module, a voltage transformation module and a voltage divider module connected in sequence.
  • the power supply module provides the reference voltage
  • the transformer The voltage module steps down the reference voltage to the first data driving voltage
  • the voltage dividing module generates a reference voltage lower than the first data driving voltage according to the first data driving voltage, so that the reference voltage is lower than the first data driving voltage
  • the reference voltage is only generated by the first data driving voltage, thus reducing the reference voltage lower than the first data driving voltage and the data
  • the potential difference between the driving voltages that is, the potential difference between the lower reference voltage and the data driving voltage is reduced, thereby reducing the power loss of the voltage divider module to avoid the reliability of the driving circuit board due to excessive internal temperature
  • Fig. 1 is the circuit diagram of the reference voltage generating circuit provided by the prior art
  • FIG. 2 is a circuit diagram of a reference voltage generating circuit provided by an embodiment of the present application.
  • FIG. 3 is a specific circuit diagram of a reference voltage generating circuit provided in an embodiment of the present application.
  • FIG. 4 is another circuit diagram of the reference voltage generation circuit provided by the embodiment of the present application.
  • FIG. 5 is a circuit diagram of a gamma voltage generated by a reference voltage generating circuit provided in an embodiment of the present application
  • FIG. 6 is a schematic flowchart of a method for generating a reference voltage provided in an embodiment of the present application.
  • both the common voltage VCOM and the gamma voltage GAMMA are obtained by dividing the unified data driving voltage AVDD.
  • the reference voltage Vin' is 12V
  • the data drive voltage AVDD output by the boost sub-circuit 102 is 16V
  • the CF VCOM voltage output by the voltage divider sub-circuit 103 is 6.2V
  • Fig. 2 is a circuit diagram of the reference voltage generating circuit provided by the embodiment of the present application.
  • the reference voltage generating circuit 20 provided by the embodiment of the present application includes a power supply module 201, a voltage transforming module 202 and a voltage dividing module 203 connected in sequence ,in:
  • the power supply module 201 is used to provide a reference voltage Vin
  • the voltage transforming module 202 is used for a first data driving voltage V1, and the first data driving voltage V1 is smaller than the reference voltage Vin;
  • the voltage dividing module 203 is used for generating a reference voltage lower than the first data driving voltage V1 according to the first data driving voltage V1.
  • the reference voltage generation circuit includes a power supply module 201, a voltage transformation module 202, and a voltage division module 203 connected in sequence.
  • the power supply module 201 first provides a reference voltage Vin, and then the voltage transformation module 202 provides the reference voltage Vin.
  • the reference voltage Vin is stepped down to the first data driving voltage V1, and finally the voltage divider module 203 generates a reference voltage lower than the first data driving voltage V1 according to the first data driving voltage V1, so that the reference voltage is lower than the first data driving voltage V1.
  • the reference voltage of the driving voltage V1 is only generated by the first data driving voltage V1, thereby reducing the potential difference between the lower reference voltage and the data driving voltage, thereby reducing the power loss of the voltage dividing module 203 to avoid driving circuit
  • the voltage transforming module 202 is also used to provide the second data driving voltage V2 according to the reference voltage Vin, and the second data driving voltage V2 is greater than the reference voltage Vin; the voltage dividing module 203 is also used to generate the second data driving voltage V2 not less than The reference voltage of the first data driving voltage V1.
  • the reference voltage generation circuit provided by the embodiment of the present application is also used to boost the reference voltage Vin to the second data driving voltage V2 through the voltage transformation module 202, and then generate different voltages according to the second data driving voltage V2 through the voltage dividing module 203.
  • the driving voltage V1 is not generated by the second data driving voltage V2, so that all reference voltages in the prior art are generated by the second data driving voltage V2, so that the reference voltage smaller than the first data driving voltage V1 is the same as the second data driving voltage V2
  • the reference voltage generating circuit provided in the embodiment of the present application is based on the voltage between the reference voltage less than the first data driving voltage V1 and the first data driving voltage V1 The difference is much smaller than the voltage difference with the second data driving voltage V2, which greatly reduces the power consumption of the voltage dividing module 203.
  • the reference voltage includes a common voltage VCOM and a gamma voltage GAMMA.
  • the common voltage VCOM includes an array substrate common voltage AVCOM and a color filter substrate common voltage CF VCOM.
  • the current I in the reference voltage generating circuit is 20mA
  • the reference voltage Vin provided by the power supply module 201 is 12V
  • the second data driving voltage V2 output by the transformer module 202 is 16V
  • the first data driving voltage V1 is 6.5V
  • the generation circuit provided by the embodiment of the present application generates the common voltage VCOM which is smaller than the first data driving voltage V1 from the first data driving voltage V1 instead of the second data driving voltage V2, that is, it is lower than the first data driving voltage VCOM.
  • the common voltage VCOM of V1 can be generated by a data driving voltage lower than that of the prior art, so as to improve the efficiency of the voltage dividing module 203 and improve the overall efficiency of the circuit.
  • FIG. 3 is a specific circuit diagram of a reference voltage generation circuit provided by the embodiment of the present application.
  • the boost unit 2021 adopts a boost circuit (boost circuit)
  • the step-down unit 2022 adopts a buck circuit (step-down circuit)
  • the transformer module 202 adopts a boost circuit through the parallel connection of the boost unit 2021 and the step-down unit 2022.
  • -buck circuit boost-boost circuit
  • the voltage dividing module 203 includes a plurality of resistors R1 ⁇ Rn connected in series (n is a positive integer), and the voltage dividing module 203 utilizes a plurality of resistors R1 ⁇ Rn connected in series to control the second data driving voltage V2 and/or the second data driving voltage V2.
  • a data driving voltage V1 is divided to generate reference voltages, such as a common voltage VCOM and a gamma voltage GAMMA.
  • each of the series resistors R1 ⁇ Rn is controlled by a corresponding switch S, and the voltage dividing module 203 selects different numbers of series resistors R among the plurality of series resistors R1 ⁇ Rn to control the second data drive voltage V2 or the first data
  • the driving voltage V1 is divided to generate different reference voltages, such as multiple common voltages VCOM or multiple gamma voltages GAMMA, according to the second data driving voltage V2 or the first data driving voltage V1.
  • the resistance values of the series resistors R1 to Rn can be the same or different, and the resistance value of each series resistor can be set according to actual needs.
  • FIG. 4 is another circuit diagram of the reference voltage generating circuit provided by the embodiment of the present application.
  • the reference voltage generating circuit further includes a buffer module 204, and the buffer module 204 is connected to the voltage dividing module 203, The buffer module 204 is used for buffering the reference voltage generated by the voltage dividing module 203 and then outputting it, so as to stabilize the final output reference voltage.
  • the ratio of the first data driving voltage V1 to the second data driving voltage V2 is not greater than 0.5, that is, the first data driving voltage V1 is not greater than half of the second data driving voltage V2, so as to increase the second data driving voltage
  • the potential difference between V2 and the first data driving voltage V1 so as to flexibly select the second data driving voltage V2 or the first data driving voltage V1 according to the required reference voltage, and reduce the potential difference between the reference voltage and the data driving voltage.
  • the circuit diagram of the reference voltage generation circuit provided by the embodiment of the present application as shown in FIG. is 12V
  • the second data driving voltage V2 output by the transformer module 202 is 16V
  • the second data driving voltage V1 is 8V
  • GAMMA1 ⁇ GAMMA7 are generated by the second data driving voltage V2
  • GAMMA8 ⁇ GAMMA14 are generated by the first data driving voltage V1 produce.
  • the generating circuit provided by the embodiment of the present application generates the gamma voltage GAMMA smaller than the first data driving voltage V1 from the first data driving voltage V1, and generates the gamma voltage GAMMA not smaller than the first data driving voltage V1 from the first data driving voltage V1.
  • the second data driving voltage V2 is generated, that is, the gamma voltage GAMMA which is smaller than the first data driving voltage V1 can be selected to be generated by a data driving voltage lower than that of the prior art, thereby improving the efficiency of the voltage dividing module 203, and improving the overall performance of the circuit. efficiency.
  • FIG. 6 is a schematic flowchart of a method for generating a reference voltage provided in an embodiment of the present application. As shown in FIG. 6 , the method for generating a reference voltage includes:
  • the power supply module 201 provides the reference voltage Vin
  • the voltage transformation module 202 steps down the reference voltage Vin to the first data driving voltage V1
  • the voltage dividing module 203 according to the
  • the first data driving voltage V1 generates a reference voltage smaller than the first data driving voltage V1, so that the reference voltage smaller than the first data driving voltage V1 is only generated by the first data driving voltage V1, thereby reducing the lower
  • the potential difference between the reference voltage and the data driving voltage reduces the power loss of the voltage dividing module 203, so as to avoid the problems of reduced reliability and reduced service life of the driving circuit board due to excessive internal temperature.
  • the method for generating the reference voltage further includes: converting the reference voltage Vin into a second data driving voltage V2 through the voltage transforming module 202, and the second data driving voltage V2 is greater than the reference voltage Vin; and, using the voltage dividing module 203 according to the second The data driving voltage V2 generates a reference voltage not smaller than the first data driving voltage V1.
  • the voltage transformation module 202 includes a boost unit 2021 and a voltage drop unit 2022 connected in parallel, and converts the reference voltage Vin into the first data driving voltage V1 and the second data driving voltage V2 through the voltage transformation module 202, specifically including:
  • the voltage unit 2022 reduces the reference voltage Vin to the first data driving voltage V1, and the voltage boosting unit 2021 increases the reference voltage Vin to the second data driving voltage V2.
  • the voltage dividing module 203 includes a plurality of resistors R1 ⁇ Rn connected in series, generates a reference voltage not less than the first data driving voltage V1 according to the second data driving voltage V2, and generates a reference voltage less than the first data driving voltage V1 according to the first data driving voltage V1.
  • the reference voltage of the voltage V1 specifically includes: using a plurality of series connected resistors R1 ⁇ Rn to divide the second data driving voltage V2 to obtain a reference voltage not less than the first data driving voltage V1; and using a plurality of series connected The resistor divides the first data driving voltage V1 to obtain a reference voltage lower than the first data driving voltage V1. That is, a reference voltage not smaller than the first data driving voltage V1 is generated by the second data driving voltage V2, and a reference voltage smaller than the first data driving voltage V1 is generated only by the first data driving voltage.
  • the method for generating the reference voltage further includes: buffering the reference voltage generated by the voltage dividing module 203 through the buffer module 204 and then outputting it, so as to stabilize the final output reference voltage.
  • an embodiment of the present application further provides a display device, the display device includes the reference voltage generating circuit as described above, the display device has the same structure and beneficial effect as the reference voltage generating circuit, because the above-mentioned embodiments have The reference voltage generating circuit has been described in detail, and will not be repeated here.
  • the reference voltage generation circuit includes a power supply module 201, a voltage transformation module 202, and a voltage division module 203 connected in sequence.
  • the reference voltage generation circuit is first powered by The module 201 provides the reference voltage Vin, and then the voltage transformation module 202 boosts the reference voltage Vin to the second data driving voltage V2 and lowers the reference voltage Vin to the first data driving voltage V1, and finally the voltage dividing module 203 according to the second
  • the data driving voltage V2 generates a reference voltage not smaller than the first data driving voltage V1, and generates a reference voltage smaller than the first data driving voltage V1 according to the first data driving voltage V1, so that the reference voltage smaller than the first data driving voltage V1 is only Generated by the first data driving voltage V1 instead of the second data driving voltage V2, thereby reducing the potential difference between the lower reference voltage and the data driving voltage, thereby reducing the power loss of the voltage dividing module 203 to avoid driving

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Abstract

本申请提供一种参考电压产生电路及其产生方法、显示装置，该参考电压产生电路降低了小于数据第一数据驱动电压的参考电压与数据驱动电压之间的电位差，即降低了较低的参考电压与数据驱动电压之间的电位差，从而减少了分压模块的功率损耗，以避免驱动电路板因内部温度过高而导致的可靠性降低和使用寿命减少的问题。

Description

参考电压产生电路及其产生方法、显示装置 技术领域
本申请涉及显示技术领域，尤其涉及一种参考电压产生电路及其产生方法、显示装置。
 背景技术
目前，显示面板的驱动电路板集成了PM IC（电源管理集成电路）、GAMMA IC（伽马校正芯片）和Level shift（移位电路），PM IC用于产生AVDD电压、VCOM电压、VGL电压和VGH电压，其中，VCOM电压（公共电压）由AVDD电压产生，GAMMA IC在AVDD电压作用下产生多组GAMMA电压（伽马电压）。
首先，VCOM电压包括多个种类，例如CF VCOM（彩膜基板公共电压），AVCOM（阵列基板公共电压）等，其中，AVCOM可能比基准电压Vin高也可能比基准电压Vin低，但是CF VCOM电压一般比基准电压Vin低，其次，一部分GAMMA电压比基准电压Vin高，而另一部分GAMMA电压比基准电压Vin低，即，由于多种VCOM电压和多组GAMMA电压均可能比基准电压Vin高或者比基准电压Vin低，因此一般将基准电压Vin通过升压电路升高为AVDD电压，再将AVDD电压通过串联电阻分压得到多种VCOM电压和多组GAMMA电压。
图1为现有技术提供的参考电压产生电路的电路图，如图1所示，参考电压包括VCOM电压和GAMMA电压，现有技术的参考电压产生电路10主要由依次连接的供电子电路101、升压子电路102和分压子电路103三部分组成，首先由供电子电路101提供基准电压Vin至升压子电路102，然后由升压子电路102将基准电压Vin升压至数据驱动电压AVDD，最后由分压子电路103将数据驱动电压AVDD分压为多种VCOM电压和多组GAMMA电压。但是，由于数据驱动电压AVDD高于基准电压Vin，因此对于远低于基准电压Vin的VCOM电压和GAMMA电压来说，数据驱动电压AVDD与远低于基准电压Vin的VCOM电压和GAMMA电压之间的电位差较大，使得分压子电路103的分压的压力较大而导致分压子电路103的功率损耗较大，而驱动电路板本身高度集成化、功耗集中，因此这不可避免地导致驱动电路板内部的温度过高，从而降低了驱动电路板的可靠性，以致于减少驱动电路板的使用寿命。
 技术问题
因此，亟需提出一种新的包括公共电压和伽玛电压的参考电压产生电路，以解决现有技术的参考电压产生电路中，由于数据驱动电压AVDD与远低于基准电压Vin的参考电压之间的电位差较大导致的功率损耗较大的问题。
 技术解决方案
为了解决上述问题，本申请实施例提供一种参考电压产生电路及其产生方法、显示装置。
第一方面，本申请实施例提供一种参考电压产生电路，该参考电压产生电路包括依次连接的供电模块、变压模块和分压模块，其中：
所述供电模块用于提供基准电压；
所述变压模块用于根据所述基准电压提供第一数据驱动电压，所述第一数据驱动电压小于所述基准电压；
所述分压模块用于根据所述第一数据驱动电压产生小于所述第一数据驱动电压的参考电压。
在一些实施例中，所述变压模块还用于根据所述基准电压提供第二数据驱动电压，所述第二数据驱动电压大于所述基准电压；所述分压模块还用于根据所述第二数据驱动电压产生不小于所述第一数据驱动电压的参考电压。
在一些实施例中，所述变压模块包括并联连接的升压单元和降压单元，其中，所述降压单元用于根据所述基准电压产生所述第一数据驱动电压，所述升压单元用于根据所述基准电压产生所述第二数据驱动电压。
在一些实施例中，所述分压模块包括多个串联的电阻，所述分压模块利用多个串联的所述电阻对所述第二数据驱动电压和/或所述第一数据驱动电压进行分压，以产生所述参考电压。
在一些实施例中，该参考电压产生电路还包括缓冲模块，所述缓冲模块与所述分压模块连接，所述缓冲模块用于将所述分压模块产生的所述参考电压进行缓冲后输出。
在一些实施例中，所述参考电压包括公共电压和/或伽马电压。
第二方面，本申请实施例还提供一种参考电压产生方法，该参考电压产生方法包括：
通过供电模块输出基准电压；
通过变压模块将所述基准电压转换为第一数据驱动电压，所述第一数据驱动电压小于所述基准电压；
通过分压模块根据所述第一数据驱动电压产生小于所述第一数据驱动电压的参考电压。
在一些实施例中，该参考电压产生方法还包括：
通过所述变压模块将所述基准电压转换为第二数据驱动电压，所述第二数据驱动电压大于所述基准电压；
通过所述分压模块根据所述第二数据驱动电压产生不小于所述第一数据驱动电压的参考电压。
在一些实施例中，所述变压模块包括并联连接的升压单元和降压单元，通过变压模块将所述基准电压转换为第一数据驱动电压和第二数据驱动电压，具体包括：
通过所述降压单元将所述基准电压降低为所述第一数据驱动电压；
通过所述升压单元将所述基准电压升高为所述第二数据驱动电压。
在一些实施例中，根据所述第二数据驱动电压产生不小于所述第一数据驱动电压的参考电压，以及根据所述第一数据驱动电压产生小于所述第一数据驱动电压的参考电压，具体包括：
利用多个串联的所述电阻对所述第二数据驱动电压进行分压，以得到不小于所述第一数据驱动电压的参考电压；
利用多个串联的所述电阻对所述第一数据驱动电压进行分压，以得到小于所述第一数据驱动电压的参考电压。
在一些实施例中，该参考电压产生方法还包括：通过缓冲模块将所述分压模块产生的所述参考电压进行缓冲后输出。
第三方面，本申请实施例还提供一种显示装置，其包括依次连接的供电模块、变压模块和分压模块，其中：
所述供电模块用于提供基准电压；
所述变压模块用于根据所述基准电压提供第一数据驱动电压，所述第一数据驱动电压小于所述基准电压；
所述分压模块用于根据所述第一数据驱动电压产生小于所述第一数据驱动电压的参考电压。
在一些实施例中，所述变压模块还用于根据所述基准电压提供第二数据驱动电压，所述第二数据驱动电压大于所述基准电压；所述分压模块还用于根据所述第二数据驱动电压产生不小于所述第一数据驱动电压的参考电压。
在一些实施例中，所述变压模块包括并联连接的升压单元和降压单元，其中，所述降压单元用于根据所述基准电压产生所述第一数据驱动电压，所述升压单元用于根据所述基准电压产生所述第二数据驱动电压。
在一些实施例中，所述分压模块包括多个串联的电阻，所述分压模块利用多个串联的所述电阻对所述第一数据驱动电压和/或所述第二数据驱动电压进行分压，以产生所述参考电压。
在一些实施例中，所述参考电压产生电路还包括缓冲模块，所述缓冲模块与所述分压模块连接，所述缓冲模块用于将所述分压模块产生的所述参考电压进行缓冲后输出。
在一些实施例中，所述参考电压包括公共电压和/或伽马电压。
 有益效果
本申请实施例提供的参考电压产生电路及其产生方法、显示装置中，该参考电压产生电路包括依次连接的供电模块、变压模块和分压模块，首先由供电模块提供基准电压，然后由变压模块将基准电压降压为第一数据驱动电压，最后由分压模块根据所述第一数据驱动电压产生小于所述第一数据驱动电压的参考电压，从而将小于所述第一数据驱动电压的参考电压仅由第一数据驱动电压产生，由此与现有技术中所有参考电压都需要由较高的数据驱动电压产生相比，降低了低于数据第一数据驱动电压的参考电压与数据驱动电压之间的电位差，即降低了较低的参考电压与数据驱动电压之间的电位差，从而减少了分压模块的功率损耗，以避免驱动电路板因内部温度过高而导致的可靠性降低和使用寿命减少的问题。
 附图说明
图1为现有技术提供的参考电压产生电路的电路图；
图2为本申请实施例提供的参考电压产生电路的电路图；
图3为本申请实施例提供的参考电压产生电路的具体电路图；
图4为本申请实施例提供的参考电压产生电路的另一种电路图；
图5为本申请实施例提供的参考电压产生电路产生伽马电压的电路图；
图6为本申请实施例提供的参考电压产生方法的流程示意图。
 本发明的实施方式
为使本申请的目的、技术方案及效果更加清楚、明确，以下参照附图并举实施例对本申请进一步详细说明。应当理解，此处所描述的具体实施例仅用以解释本申请，并不用于限定本申请。
需要说明的是，本申请各实施例的各类电压数据不考虑电压的极性，均以电压数据的绝对值为例进行说明。
如图1所示，现有技术中，公共电压VCOM和伽玛电压GAMMA均由统一的数据驱动电压AVDD分压得到，例如，假设产生电路中的电流I’为20mA，供电子电路101提供的基准电压Vin’为12V，升压子电路102输出的数据驱动电压AVDD为16V，分压子电路103输出的CF VCOM电压为6.2V，则分压子电路103的损耗功率△P’=△UI’=（AVDD-CF VCOM）*I’=（16V-6.2V）*20mA=196mW，而此时分压子电路103的输出功率P’=CF VCOM*I’=6.2V*20mA=124mW，分压子电路103的效率η2’=P’/（P’+△P’）=124/（196+124）=0.388，则产生电路的总效率η=η1’*η2’=0.85*0.388=32.9%，其中，η1’为升压子电路102的效率，设为固定值0.85。
图2为本申请实施例提供的参考电压产生电路的电路图，如图2所示，本申请实施例提供的参考电压产生电路20包括依次连接的供电模块201、变压模块202和分压模块203，其中：
所述供电模块201用于提供基准电压Vin；
所述变压模块202用于第一数据驱动电压V1，所述第一数据驱动电压V1小于所述基准电压Vin；
所述分压模块203用于根据所述第一数据驱动电压V1产生小于所述第一数据驱动电压V1的参考电压。
本申请实施例提供的参考电压产生电路包括依次连接的供电模块201、变压模块202和分压模块203，该参考电压产生电路首先由供电模块201提供基准电压Vin，然后由变压模块202将基准电压Vin降压为第一数据驱动电压V1，最后由分压模块203根据所述第一数据驱动电压V1产生小于所述第一数据驱动电压V1的参考电压，从而将小于所述第一数据驱动电压V1的参考电压仅由第一数据驱动电压V1产生，由此降低了较低的参考电压与数据驱动电压之间的电位差，从而减少了分压模块203的功率损耗，以避免驱动电路板因内部温度过高而导致的可靠性降低和使用寿命减少的问题。
进一步地，变压模块202还用于根据基准电压Vin提供第二数据驱动电压V2，第二数据驱动电压V2大于基准电压Vin；分压模块203还用于根据第二数据驱动电压V2产生不小于第一数据驱动电压V1的参考电压。
也即，本申请实施例提供的参考电压产生电路还用于通过变压模块202将基准电压Vin升压为第二数据驱动电压V2，然后通过分压模块203根据第二数据驱动电压V2产生不小于第一数据驱动电压V1的参考电压，从而将不小于第一数据驱动电压V1的参考电压由第二数据驱动电压V2产生，而将小于第一数据驱动电压V1的参考电压仅由第一数据驱动电压V1而不由第二数据驱动电压V2产生，这样与现有技术中所有参考电压均由第二数据驱动电压V2产生，使得小于第一数据驱动电压V1的参考电压与第二数据驱动电压V2会存在较大电位差，分压模块203功耗较大相比，本申请实施例提供的参考电压产生电路根据小于第一数据驱动电压V1的参考电压与第一数据驱动电压    V1之间的电压差远小于与第二数据驱动电压V2之间的电压差，大大减少了分压模块203的功耗。
需要说明的是，参考电压包括公共电压VCOM和伽马电压GAMMA.其中，公共电压VCOM包括阵列基板公共电压AVCOM和彩膜基板公共电压CF VCOM。
例如，假设参考电压产生电路中的电流I为20mA，供电模块201提供的基准电压Vin为12V，变压模块202输出的第二数据驱动电压V2为16V、第一数据驱动电压V1为6.5V，分压模块203输出的CF VCOM电压为6.2V，其中，由于CF VCOM电压比第一数据驱动电压V1低，因此CF VCOM电压根据第一数据驱动电压V1产生而不根据第二数据驱动电压V2产生，则分压模块203的损耗功率△P=△UI=（V1-CF VCOM）*I=（6.5V-6.2V）*20mA=6mW，而此时分压模块203的输出功率P=CF VCOM*I=6.2V*20mA=124mW，根据电路效率=输出功率/输入功率，分压模块203的效率η2=P/（P+△P）=124/（6+124）=0.954，则参考电压产生电路的总效率η=η1*η2=0.85*0.388=81%＞32.9%，其中，η1为变压模块202的效率，设为固定值0.85。由此可知，本申请实施例提供的产生电路将小于第一数据驱动电压V1的公共电压VCOM由第一数据驱动电压V1产生而不由第二数据驱动电压V2产生，即，小于第一数据驱动电压V1的公共电压VCOM能选择由比现有技术更低的数据驱动电压产生，从而提高分压模块203的效率，以提高该电路的总效率。
图3为本申请实施例提供的参考电压产生电路的具体电路图，如图3所示，所述变压模块202包括并联连接的升压单元2021和降压单元2022，其中，所述升压单元2021用于根据所述基准电压Vin产生所述第二数据驱动电压V2，所述降压单元2022用于根据所述基准电压Vin产生所述第一数据驱动电压V1。可以理解的是，升压单元2021采用boost电路（升压电路），降压单元2022采用buck电路（降压电路），变压模块202通过并联连接的升压单元2021和降压单元2022采用boost-buck电路（升降压电路）。
请继续参阅图3，分压模块203包括多个串联的电阻R1~Rn（n为正整数），分压模块203利用多个串联的电阻R1~Rn对第二数据驱动电压V2和/或第一数据驱动电压V1进行分压，以产生参考电压，例如公共电压VCOM和伽玛电压GAMMA。即，每个串联电阻R1~Rn均由对应的开关S控制，分压模块203通过在多个串联电阻R1~Rn中选择不同数量的串联电阻R对第二数据驱动电压V2或者对第一数据驱动电压V1进行分压，从而根据第二数据驱动电压V2或者第一数据驱动电压V1产生不同的参考电压，例如多个公共电压VCOM或多个伽玛电压GAMMA。需要说明的是，串联电阻R1~Rn的电阻值可以相同，也可以不同，可根据实际需要设置每个串联电阻的阻值。
图4为本申请实施例提供的参考电压产生电路的另一种电路图，如图4所示，该参考电压产生电路还包括缓冲模块204，所述缓冲模块204与所述分压模块203连接，所述缓冲模块204用于将所述分压模块203产生的参考电压进行缓冲后输出，以稳定最终输出的参考电压。
在一些实施例中，第一数据驱动电压V1与第二数据驱动电压V2的比值不大于0.5，即第一数据驱动电压V1不大于第二数据驱动电压V2的一半，以提高第二数据驱动电压V2和第一数据驱动电压V1之前的电位差，从而根据需要产生的参考电压灵活选择第二数据驱动电压V2或第一数据驱动电压V1，减小参考电压与数据驱动电压之间的电位差。
例如，假设参考电压产生电路需要产生14个伽玛电压GAMMA：GAMMA1=15V，GAMMA2=14V，GAMMA3=13V，GAMMA4=12V，GAMMA5=11V，GAMMA6=10V，GAMMA7=9V，GAMMA8=7V，GAMMA9=6V，GAMMA10=5V，GAMMA11=4V，GAMMA12=3V，GAMMA13=2V，GAMMA14=1V。
若采用图1所示的现有技术的参考电压产生电路，假设供电子电路101提供的基准电压Vin’为12V，升压子电路102输出的数据驱动电压AVDD为16V，则分压子电路103的输入功率P1’=AVDD*I0’，其中，I0’为分压子电路103的总电流，若产生每个伽玛电压GAMMA为一条支路，且每条伽玛电压GAMMA的支路的电流I’均为10mA，则产生14个伽玛电压GAMMA需要14条并联支路，此时I1’=14*I’=14*10mA=140mA，P1’=AVDD*I0’=16V*140mA=2240mW，而此时分压子电路103的输出功率P’=（GAMMA1+GAMMA2+GAMMA3+……+GAMMA14）*I’=（15+14+13+12+11+10+9+7+6+5+4+3+2+1）V*10mA=1120mW，分压子电路103的效率η2’=P’/P1’=1120/2240=0.5，则产生电路的总效率η’=η1’*η2’=0.85*0.5=42.5%，其中，η1为升压子电路102的效率，设为固定值0.85。
若采用图2所示的本申请实施例提供的参考电压产生电路，如图5所示的本申请实施例提供的参考电压产生电路产生伽马电压的电路图，假设供电模块201提供的基准电压Vin为12V，变压模块202输出的第二数据驱动电压V2为16V，第二数据驱动电压V1为8V，则GAMMA1~GAMMA7由第二数据驱动电压V2产生，GAMMA8~GAMMA14由第一数据驱动电压V1产生。同样地，若每条伽玛电压GAMMA的支路的电流均为10mA，根据分压模块203的输入功率P1=V2*I01+V1*I02，其中，I01为分压模块203中对应于升压单元2021的伽玛电压GAMMA支路GAMMA1~GAMMA7的总电流，I02为分压模块203中对应于降压单元2022的伽马支路GAMMA8~GAMMA14的总电流，即I01和I02均为70mA，求得P1=V2*I01+V1*I02=16V*70mA+8V*70mA=1120mW+560mW=1680mW，而此时分压模块203的输出功率P=（GAMMA1+GAMMA2+GAMMA3+……+GAMMA14）*I=（15+14+13+12+11+10+9+7+6+5+4+3+2+1）V*10mA=1120mW，分压模块203的效率η2=P/P1=1120/1680=0.67，则产生电路的总效率η=η1*η2=0.85*0.67=56.7%＞42.5%，其中，η1为变压模块202的效率，设为固定值0.85，即变压模块202中的升压单元2021的效率η11和降压单元2022的效率η12均为0.85。由此可知，本申请实施例提供的产生电路将小于第一数据驱动电压V1的伽马电压GAMMA由第一数据驱动电压V1产生，将不小于第一数据驱动电压V1的伽马电压GAMMA由第二数据驱动电压V2产生，即，小于第一数据驱动电压V1的伽马电压GAMMA能选择由比现有技术更低的数据驱动电压产生，从而提高分压模块203的效率，以提高该电路的总效率。
基于上述实施例，图6为本申请实施例提供的参考电压产生方法的流程示意图，如图6所示，该参考电压产生方法包括：
S1、通过供电模块201输出基准电压Vin。
S2、通过变压模块202将基准电压Vin转换为第一数据驱动电压V1，第一数据驱动电压V1小于基准电压Vin。
S3、通过分压模块203根据第一数据驱动电压V1产生小于第一数据驱动电压V1的参考电压。
本申请实施例提供的参考电压产生方法，首先由供电模块201提供基准电压Vin，然后由变压模块202将基准电压Vin降压为第一数据驱动电压V1，最后由分压模块203根据所述第一数据驱动电压V1产生小于所述第一数据驱动电压V1的参考电压，从而将小于所述第一数据驱动电压V1的参考电压仅由第一数据驱动电压V1产生，由此降低了较低的参考电压与数据驱动电压之间的电位差，从而减少了分压模块203的功率损耗，以避免驱动电路板因内部温度过高而导致的可靠性降低和使用寿命减少的问题。
进一步地，该参考电压产生方法还包括：通过变压模块202将基准电压Vin转换为第二数据驱动电压V2，第二数据驱动电压V2大于基准电压Vin；以及，通过分压模块203根据第二数据驱动电压V2产生不小于第一数据驱动电压V1的参考电压。
其中，变压模块202包括并联连接的升压单元2021和降压单元2022，通过变压模块202将基准电压Vin转换为第一数据驱动电压V1和第二数据驱动电压V2，具体包括：通过降压单元2022将基准电压Vin降低为第一数据驱动电压V1，以及，通过升压单元2021将基准电压Vin升高为第二数据驱动电压V2。
其中，分压模块203包括多个串联的电阻R1~Rn，根据第二数据驱动电压V2产生不小于第一数据驱动电压V1的参考电压，以及根据第一数据驱动电压V1产生小于第一数据驱动电压V1的参考电压，具体包括：利用多个串联的电阻R1~Rn对第二数据驱动电压V2进行分压，以得到不小于第一数据驱动电压V1的参考电压；以及，利用多个串联的电阻对第一数据驱动电压V1进行分压，以得到小于第一数据驱动电压V1的参考电压。也就是说，不小于第一数据驱动电压V1的参考电压由第二数据驱动电压V2产生，而小于第一数据驱动电压V1的参考电压仅由第一数据将驱动电压产生。
进一步地，该参考电压产生方法还包括：通过缓冲模块204将分压模块203产生的参考电压进行缓冲后输出，以稳定最终输出的参考电压。
基于上述实施例，本申请实施例还提供一种显示装置，该显示装置包括如上所述的参考电压产生电路，该显示装置与该参考电压产生电路的结构和有益效果相同，由于上述实施例已对该参考电压产生电路进行了详细描述，此处不再赘述。
本申请实施例提供的参考电压产生电路及其产生方法、显示装置中，该参考电压产生电路包括依次连接的供电模块201、变压模块202和分压模块203，该参考电压产生电路首先由供电模块201提供基准电压Vin，然后由变压模块202将基准电压Vin升压为第二数据驱动电压V2以及将基准电压Vin降压为第一数据驱动电压V1，最后由分压模块203根据第二数据驱动电压V2产生不小于第一数据驱动电压V1的参考电压，以及根据第一数据驱动电压V1产生小于第一数据驱动电压V1的参考电压，从而将小于第一数据驱动电压V1的参考电压仅由第一数据驱动电压V1而不由第二数据驱动电压V2产生，由此降低了较低的参考电压与数据驱动电压之间的电位差，从而减少了分压模块203的功率损耗，以避免驱动电路板因内部温度过高而导致的可靠性降低和使用寿命减少的问题。其中，参考电压包括公共电压VCOM和伽玛电压GAMMA。
可以理解的是，对本领域普通技术人员来说，可以根据本申请的技术方案及其发明构思加以等同替换或改变，而所有这些改变或替换都应属于本申请所附的权利要求的保护范围。

Claims (17)

  1. 一种参考电压产生电路，其包括依次连接的供电模块、变压模块和分压模块，其中：
    所述供电模块用于提供基准电压；
    所述变压模块用于根据所述基准电压提供第一数据驱动电压，所述第一数据驱动电压小于所述基准电压；
    所述分压模块用于根据所述第一数据驱动电压产生小于所述第一数据驱动电压的参考电压。
  2. 如权利要求1所述的参考电压产生电路，其中，所述变压模块还用于根据所述基准电压提供第二数据驱动电压，所述第二数据驱动电压大于所述基准电压；所述分压模块还用于根据所述第二数据驱动电压产生不小于所述第一数据驱动电压的参考电压。
  3. 如权利要求2所述的参考电压产生电路，其中，所述变压模块包括并联连接的升压单元和降压单元，其中，所述降压单元用于根据所述基准电压产生所述第一数据驱动电压，所述升压单元用于根据所述基准电压产生所述第二数据驱动电压。
  4. 如权利要求2所述的参考电压产生电路，其中，所述分压模块包括多个串联的电阻，所述分压模块利用多个串联的所述电阻对所述第一数据驱动电压和/或所述第二数据驱动电压进行分压，以产生所述参考电压。
  5. 如权利要求1所述的参考电压产生电路，其中，还包括缓冲模块，所述缓冲模块与所述分压模块连接，所述缓冲模块用于将所述分压模块产生的所述参考电压进行缓冲后输出。
  6. 如权利要求1所述的参考电压产生电路，其中，所述参考电压包括公共电压和/或伽马电压。
  7. 一种参考电压产生方法，其包括：
    通过供电模块输出基准电压；
    通过变压模块将所述基准电压转换为第一数据驱动电压，所述第一数据驱动电压小于所述基准电压；
    通过分压模块根据所述第一数据驱动电压产生小于所述第一数据驱动电压的参考电压。
  8. 如权利要求7所述的参考电压产生方法，其中，还包括：
    通过所述变压模块将所述基准电压转换为第二数据驱动电压，所述第二数据驱动电压大于所述基准电压；
    通过所述分压模块根据所述第二数据驱动电压产生不小于所述第一数据驱动电压的参考电压。
  9. 如权利要求8所述的参考电压产生方法，其中，所述变压模块包括并联连接的升压单元和降压单元，通过变压模块将所述基准电压转换为第一数据驱动电压和第二数据驱动电压，具体包括：
    通过所述降压单元将所述基准电压降低为所述第一数据驱动电压；
    通过所述升压单元将所述基准电压升高为所述第二数据驱动电压。
  10. 如权利要求8所述的参考电压产生方法，其中，所述分压模块包括多个串联的电阻，根据所述第二数据驱动电压产生不小于所述第一数据驱动电压的参考电压，以及根据所述第一数据驱动电压产生小于所述第一数据驱动电压的参考电压，具体包括：
    利用多个串联的所述电阻对所述第二数据驱动电压进行分压，以得到大于所述第一数据驱动电压的参考电压；
    利用多个串联的所述电阻对所述第一数据驱动电压进行分压，以得到不大于所述第一数据驱动电压的参考电压。
  11. 如权利要求8所述的参考电压产生方法，其中，还包括：通过缓冲模块将所述分压模块产生的所述参考电压进行缓冲后输出。
  12. 一种显示装置，其包括参考电压产生电路，所述参考电压产生电路包括依次连接的供电模块、变压模块和分压模块，其中：
    所述供电模块用于提供基准电压；
    所述变压模块用于根据所述基准电压提供第一数据驱动电压，所述第一数据驱动电压小于所述基准电压；
    所述分压模块用于根据所述第一数据驱动电压产生小于所述第一数据驱动电压的参考电压。
  13. 如权利要求12所述的显示装置，其中，所述变压模块还用于根据所述基准电压提供第二数据驱动电压，所述第二数据驱动电压大于所述基准电压；所述分压模块还用于根据所述第二数据驱动电压产生不小于所述第一数据驱动电压的参考电压。
  14. 如权利要求13所述的显示装置，其中，所述变压模块包括并联连接的升压单元和降压单元，其中，所述降压单元用于根据所述基准电压产生所述第一数据驱动电压，所述升压单元用于根据所述基准电压产生所述第二数据驱动电压。
  15. 如权利要求13所述的显示装置，其中，所述分压模块包括多个串联的电阻，所述分压模块利用多个串联的所述电阻对所述第一数据驱动电压和/或所述第二数据驱动电压进行分压，以产生所述参考电压。
  16. 如权利要求12所述的显示装置，其中，所述参考电压产生电路还包括缓冲模块，所述缓冲模块与所述分压模块连接，所述缓冲模块用于将所述分压模块产生的所述参考电压进行缓冲后输出。
  17. 如权利要求12所述的显示装置，其中，所述参考电压包括公共电压和/或伽马电压。
PCT/CN2021/108648 2021-06-24 2021-07-27 参考电压产生电路及其产生方法、显示装置 WO2022267165A1 (zh)

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