CN114974158A - Voltage conversion circuit, display drive chip, display device, and information processing apparatus - Google Patents

Voltage conversion circuit, display drive chip, display device, and information processing apparatus Download PDF

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Publication number
CN114974158A
CN114974158A CN202210470346.2A CN202210470346A CN114974158A CN 114974158 A CN114974158 A CN 114974158A CN 202210470346 A CN202210470346 A CN 202210470346A CN 114974158 A CN114974158 A CN 114974158A
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China
Prior art keywords
voltage
switching circuit
power
input
power supply
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CN202210470346.2A
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Chinese (zh)
Inventor
周坤
谭仲齐
李辉
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Beijing Orende Microelectronics Technology Co ltd
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Beijing Orende Microelectronics Technology Co ltd
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Priority to CN202210470346.2A priority Critical patent/CN114974158A/en
Publication of CN114974158A publication Critical patent/CN114974158A/en
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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
    • 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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • 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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • 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
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Power Sources (AREA)

Abstract

The present disclosure relates to a voltage conversion circuit, a display drive chip, a display device, and an information processing apparatus, the voltage conversion circuit including: an input/output interface; and the voltage switching unit is used for receiving a control instruction and a power supply voltage, outputting one of a first voltage and a second voltage according to the control instruction and the power supply voltage, and supplying power to the input/output interface, wherein the first voltage is higher than the second voltage, so that the I/O interface of the display driving chip can be compatible with different voltage requirements, the requirement of the mobile device on power consumption optimization is met, and the power consumption of the display driving chip can be reduced.

Description

Voltage conversion circuit, display drive chip, display device, and information processing apparatus
Technical Field
The present disclosure relates to the field of display devices, and in particular, to a voltage conversion circuit, a display driver chip, a display device, and an information processing apparatus.
Background
Electronic products have been integrated into people's life, become an indispensable part of life, and especially when people are going out, the battery live time requirement to electronic mobile product is higher and higher, and standby time is of a specified duration, and the low power consumption becomes whether mobile product can occupy the market, gains the core competitiveness of the first opportunity.
Some mobile device designers reduce the driving voltage of an I/O interface connected between a device and a Display Driver Integrated Circuit (DDIC) for optimizing power consumption, and therefore, the DDIC needs to be designed to be compatible accordingly.
Disclosure of Invention
In view of this, the present disclosure proposes a voltage conversion circuit, a display driving chip, a display device, and an information processing apparatus.
In one aspect, a voltage conversion circuit for a display driver chip is provided, the circuit comprising:
an input/output interface;
and the voltage switching unit is used for receiving a control instruction and a power supply voltage, outputting one of a first voltage and a second voltage according to the control instruction and the power supply voltage, and supplying power to the input/output interface, wherein the first voltage is higher than the second voltage.
In one possible implementation, the supply voltage includes a first supply voltage and a second supply voltage, the first supply voltage being higher than the second supply voltage;
the first voltage comprises the first supply voltage;
the second voltage includes a voltage obtained by converting the first power supply voltage, or the second power supply voltage.
In a possible implementation manner, the voltage switching unit includes a first switching circuit, a first terminal of the first switching circuit receives the first power voltage, a second terminal of the first switching circuit receives the second power voltage, a third terminal of the first switching circuit is connected to the input/output interface,
the first switching circuit takes the first power voltage as a first voltage according to a received first control instruction, or takes the second power voltage as a second voltage to be output to the input/output interface through a third end of the first switching circuit.
In a possible implementation manner, the voltage switching unit includes a second switching circuit, a first terminal of the second switching circuit receives the first power voltage, a second terminal of the second switching circuit is connected to an input terminal of a voltage converter, a third terminal of the second switching circuit and an output terminal of the voltage converter are connected to the input/output interface,
the second switching circuit outputs the first power voltage as the first voltage to the input/output interface through the third terminal according to a received second control instruction, or outputs the first power voltage to a voltage converter through the second terminal for conversion, and outputs a second voltage obtained by conversion to the input/output interface.
In one possible implementation, the voltage switching unit includes a third switching circuit and a fourth switching circuit,
a first terminal of the third switching circuit receives the first power voltage, a second terminal of the third switching circuit receives the second power voltage, a third terminal of the third switching circuit is connected to a first terminal of the fourth switching circuit,
the third switching circuit outputs the first power supply voltage or the second power supply voltage to the first end of the fourth switching circuit through the third end of the third switching circuit according to a received third control instruction;
a first end of the fourth switching circuit receives one of the first power voltage and the second power voltage, a second end of the fourth switching circuit is connected with an input end of a voltage converter, a third end of the fourth switching circuit and an output end of the voltage converter are connected with the input/output interface,
when the first end of the fourth switching circuit receives a first power voltage, the fourth switching circuit outputs the first power voltage as the first voltage to the input/output interface through the third end according to a received fourth control instruction, or outputs the first power voltage to a voltage converter through the second end for conversion, and outputs a second voltage obtained after conversion to the input/output interface;
when the first terminal of the fourth switching circuit receives a second power supply voltage, the fourth switching circuit outputs the second power supply voltage as the second voltage to the input/output interface through a third terminal according to a received fourth control instruction.
In a possible implementation manner, the voltage switching unit includes a fifth switching circuit, a first terminal of the fifth switching circuit is connected to the output terminal of the voltage converter, a second terminal of the fifth switching circuit receives the first power voltage, a third terminal of the fifth switching circuit receives the second power voltage, a fourth terminal of the fifth switching circuit is connected to the input/output interface,
wherein the input end of the voltage converter receives the first power supply voltage and outputs a converted second voltage at the output end,
the fifth switching circuit outputs a second voltage output by an output end of the voltage converter to the input/output interface through the fourth end according to a received fifth control instruction, or outputs a first power supply voltage received by the second end to the input/output interface through the fourth end as a first voltage, or outputs a second power supply voltage received by the third end to the input/output interface through the fourth end as a second voltage.
In one possible implementation manner, the first control instruction, the second control instruction, the third control instruction, the fourth control instruction, and the fifth control instruction are stored by a register and output to the voltage conversion circuit.
In one possible implementation, the first power supply voltage comprises a system I/O interface power supply VDDI voltage and the second power supply voltage comprises a digital power supply DVDD voltage.
In one possible implementation, the first voltage is 1.8V and the second voltage is 1.2V.
In another aspect, a display driving chip is provided, which includes the above voltage converting circuit.
In another aspect, a display device is provided, which includes a display panel and the display driving chip.
In one possible implementation manner, the display panel includes at least one of a liquid crystal display panel, a micro light emitting diode display panel, a mini light emitting diode display panel, a quantum dot light emitting diode display panel, and an organic light emitting diode display panel.
On the other hand, an information processing apparatus is proposed, which comprises a central processing unit and the display device, wherein the central processing unit is used for communicating with the display device.
Other features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features, and aspects of the disclosure and, together with the description, serve to explain the principles of the disclosure.
Fig. 1 shows a block diagram of an information processing apparatus of an embodiment of the present disclosure.
Fig. 2 shows a block diagram of a voltage conversion circuit 1221 according to an embodiment of the disclosure.
Fig. 3 shows a schematic diagram of one example of a voltage switching unit of an embodiment of the present disclosure.
Fig. 4 shows a schematic diagram of another example of a voltage switching unit of an embodiment of the present disclosure.
Fig. 5 shows a schematic diagram of another example of a voltage switching unit of an embodiment of the present disclosure.
Fig. 6 shows a schematic diagram of another example of a voltage switching unit of an embodiment of the present disclosure.
Detailed Description
Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present disclosure. It will be understood by those skilled in the art that the present disclosure may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present disclosure.
The embodiment of the disclosure can change or select the power supply voltage provided by the power management chip of the mobile device to the display driving chip DDIC, so that the I/O interface of the display driving chip can be compatible with different voltage requirements, thereby meeting the requirement of the mobile device for power consumption optimization and reducing the power consumption of the DDIC.
Fig. 1 shows a block diagram of an information processing apparatus 10 according to an embodiment of the present disclosure, where the information processing apparatus 10 includes a central processing unit 11 and a display device 12, where the central processing unit 11 is configured to communicate with the display device 12. The information processing apparatus 10 may be used for mobile devices such as a mobile phone, a tablet computer, a notebook computer, a palmtop computer, and the like.
In a possible manner, the display device 12 further includes a display panel 121 and a display driving chip 122.
The display device 12 may perform image display according to the received signal.
In one possible approach, the display panel 121 includes at least one of a liquid crystal display panel, a micro light emitting diode display panel, a mini light emitting diode display panel, a quantum dot light emitting diode display panel, and an organic light emitting diode display panel.
The display panel 121 displays corresponding images according to the gate-source voltage provided by the display driving chip 122. In one example, the display panel uses an Organic Light Emitting Diode (OLED).
In a possible manner, the information processing apparatus further includes a power management chip 13, and the mode in which the power management chip 13 supplies power to the display driving chip 122 may be three power outputs or four power outputs.
The three power outputs comprise an analog power supply AVDD used for supplying power to the analog circuit part, a chip power supply VCI used for supplying power to the core circuit, a system I/O interface power supply VDDI used for supplying power to the I/O interface.
The four power supplies are added with a digital power supply DVDD on the basis of the output of the three power supplies to supply power for the digital circuit.
The display driving chip 122 may include a voltage converting circuit 1221, and the voltage converting circuit 1221 may receive the power supply voltage of the power supply management chip 13, and output a higher first voltage or a lower second voltage to the input/output interface according to the control instruction, so as to implement interface voltage compatibility and meet the requirement of low power consumption.
Fig. 2 shows a block diagram of a voltage conversion circuit 1221 according to an embodiment of the disclosure. As shown in fig. 2, the voltage conversion 1221 circuit includes:
an input/output interface 21;
and a voltage switching unit 22, configured to receive a control instruction and a power supply voltage, and output one of a first voltage and a second voltage according to the control instruction and the power supply voltage to supply power to the input/output interface 21, where the first voltage is higher than the second voltage.
In one possible approach, the input-output interface may be a general purpose I/O port pin. The input and output interface can be used as a pin of the display driving chip and used for transmitting information between the display driving chip and other parts of the mobile equipment.
In one example, a set of I/O port pins compatible with the first voltage and the second voltage may be provided as the input/output pins 21 on the basis of a set of I/O port pins used by the display driver chip based on the first voltage.
In one example, the number of input/output pins 21 may be specifically set to four pins, or any other desired number.
In practical use, if the input/output pin 21 can completely replace the original I/O port pin used based on the first voltage, the original I/O port pin used based on the first voltage can be eliminated.
In one possible approach, the display driving chip may further include a register (not shown) storing a control instruction and outputting the control instruction to the voltage conversion circuit 1221, where the control instruction may include any one of the following first control instruction, second control instruction, third control instruction, fourth control instruction, and fifth control instruction. The control command may come from other components such as the central processing unit 11, which is not limited in this application. The control instruction may also be provided by other components besides the register, for example, directly provided by the central processing unit 11, which is not limited in this application.
In one possible implementation, the supply voltage includes a first supply voltage and a second supply voltage, the first supply voltage being higher than the second supply voltage; the first voltage comprises the first supply voltage; the second voltage includes a voltage obtained by converting the first power supply voltage, or the second power supply voltage.
In one possible time-limited manner, the first power supply voltage comprises a system I/O interface power supply VDDI voltage, the second power supply voltage comprises a digital power supply DVDD voltage, and both the first power supply voltage and the second power supply voltage may be provided by the power management chip 13.
In one example, the first voltage is 1.8V and the second voltage is 1.2V. Those skilled in the art will understand that the first voltage and the second voltage may be other voltage values set according to requirements.
In one possible approach, the voltage switching unit 22 includes one or more circuits shown in fig. 3, 4, 5, and 6.
Fig. 3 shows a schematic diagram of one example of a voltage switching unit of an embodiment of the present disclosure.
In one possible implementation, as shown in fig. 3, the voltage switching unit 22 may include a first switching circuit 221.
A first terminal of the first switching circuit 221 receives the first power voltage, for example VDDI, a second terminal of the first switching circuit 221 receives the second power voltage, for example DVDD, and a third terminal of the first switching circuit 221 is connected to the input/output interface 21.
In one possible implementation, the first switching circuit 221 may include a selector 2210.
The selector 2210 is used for selecting the first power voltage VDDI and the second power voltage DVDD, that is, gating one of the first power voltage VDDI and the second power voltage DVDD to output to the input/output interface 21 through the third terminal.
The selector 2210 can be selected according to actual conditions, and the present disclosure gives an example, and the selector 2210 can be an alternative selector.
In one possible embodiment, the first switching circuit 221 is operable to select the first power voltage VDDI and the second power voltage DVDD to output the first voltage (i.e., the first power voltage VDDI) or the second voltage (i.e., the second power voltage DVDD) when the four power inputs are provided.
The first switching circuit 221 may operate according to a first control instruction provided by a register. The first switching circuit 221 may output the first power voltage DVDD as a first voltage or the second power voltage VDDI as a second voltage to the input/output interface 21 through the third terminal of the first switching circuit 221 according to the first control instruction.
Therefore, compatibility of different interface voltages in the three-power-supply mode can be realized.
Fig. 4 shows a schematic diagram of another example of a voltage switching unit of an embodiment of the present disclosure.
In one possible implementation, as shown in fig. 4, the voltage switching unit 22 may include a voltage converter 2201 and a second switching circuit 222.
The input end of the voltage converter 2201 is connected to the second end of the second switching circuit 222, and the output end is connected to the input/output interface 21.
The voltage converter 2201 has a voltage conversion function, and in a possible embodiment, an input end of the voltage converter 2201 receives an input of the first power voltage VDDI, and an output end thereof outputs a second voltage obtained by the conversion to the input/output interface 21.
The voltage converter may be a conventional Buck converter, a Boost converter, a conventional linear regulator, an LDO (low dropout regulator), or the like.
In one possible implementation, the voltage converter 2201 selects LDO in order to achieve small delta step down variation.
A first terminal of the second switching circuit 222 receives the first power supply voltage, e.g., VDDI. A second terminal of the second switching circuit 222 is connected to an input terminal of a voltage converter 2201, and a third terminal of the second switching circuit 222 and an output terminal of the voltage converter 2201 are connected to the input/output interface 21.
In one possible implementation, the second switching circuit 222 may include a selector 2220.
The selector 2220 is used to select the output channel of the first power voltage VDDI, that is, to output the first power voltage VDDI to the input/output interface 21 or to the input terminal of the voltage converter 2201.
The selector 2220 may be an alternative selector.
In one possible implementation, the second switching circuit 222 may operate at three power inputs.
The second switching circuit 222 may operate according to a second control instruction provided by a register.
In a possible embodiment, the voltage switching unit 22 may operate at three power inputs, and the second switching circuit 222 outputs the first power voltage VDDI as the first voltage to the input/output interface 21 through the third terminal according to the second control instruction, or outputs the first power voltage VDDI to the voltage converter 2201 through the second terminal for conversion, and outputs the converted second voltage to the input/output interface 21.
Therefore, compatibility of different interface voltages in the four-power mode can be achieved.
Fig. 5 shows a schematic diagram of another example of a voltage switching unit of an embodiment of the present disclosure.
In one possible implementation, as shown in fig. 5, the voltage switching unit 22 may include a voltage converter 2202, a third switching circuit 223 and a fourth switching circuit 224.
The input end of the voltage converter 2202 is connected to the second end of the fourth switching circuit 224, and the output end thereof is connected to the input/output interface 21.
The voltage converter 2202 and the voltage converter 2201 may have the same function, and in one possible implementation, the voltage converter 2202 may select LDO.
A first terminal of the third switching circuit 223 receives the first supply voltage, e.g., VDDI. A second terminal of the third switching circuit 223 receives the second power supply voltage, e.g., DVDD. The third terminal of the third switching circuit 223 is connected to the first terminal of the fourth switching circuit 224.
In one possible implementation, the third switching circuit 223 may include a selector 2230.
The selector 2230 is for selecting the first power voltage VDDI and the second power voltage DVDD, i.e., gating one of the first power voltage VDDI and the second power voltage DVDD to the first terminal of the fourth switching circuit 224.
The selector 2230 may be an alternative selector.
In one possible embodiment, the third switching circuit 223 may operate at three or four power inputs.
The third switching circuit 223 may operate according to a third control instruction provided from a register.
In one possible embodiment, the third switching circuit 223 may output the first power voltage VDDI to the first terminal of the fourth switching circuit 224 according to the third control instruction when the power is three-power.
In one possible embodiment, the third switching circuit 223 may output one of the first power voltage VDDI and the second power voltage DVDD to the first terminal of the fourth switching circuit 224 according to the third control instruction when the power is four.
A first terminal of the fourth switching circuit 224 receives one of the first power voltage VDDI and the second power voltage DVDD, a second terminal of the fourth switching circuit 224 is connected to an input terminal of a voltage converter 2202, and a third terminal of the fourth switching circuit 224 and an output terminal of the voltage converter 2202 are connected to the input/output interface 21.
In one possible implementation, the fourth switching circuit 224 may include a selector 2240.
The selector 2240 is used to select the output terminal of the first power voltage VDDI or directly output the second power voltage DVDD, that is, output the first power voltage VDDI to the input terminal of the voltage converter 2202 or to the input/output interface 21, and output the second power voltage DVDD to the input/output interface 21.
The selector 2240 may be an alternative selector.
In one possible implementation, the fourth switching circuit 224 may operate at three or four power inputs.
The fourth switching circuit 224 may operate according to a fourth control instruction provided by a register.
In a possible implementation, the fourth switching circuit 224 may output the first power voltage VDDI to the input/output interface 21 or the input terminal of the voltage converter 2202 according to the fourth control command when the power is three-power.
In a possible implementation, the fourth switching circuit 224 may output one of the first power voltage VDDI and the second power voltage DVDD to the input/output interface 21 via a third terminal according to the fourth control instruction when the power is four.
There are various embodiments of a circuit of the voltage switching unit 22 shown in fig. 5 in practical use, and the following examples are given:
in one possible embodiment, the voltage switching unit 22 may operate under three power sources, and may consider that the second power source voltage is not present, the third switching circuit 223 outputs the first power source voltage VDDI to the first terminal of the fourth switching circuit 224 according to the third control command, and the fourth switching circuit 224 outputs the first power source voltage VDDI as the first voltage to the input/output interface 21 through the third terminal or outputs the first power source voltage VDDI to the voltage converter 2202 through the second terminal for conversion according to the fourth control command, and outputs the converted second voltage to the input/output interface 21.
In a possible embodiment, the voltage switching unit 22 may operate at four power supplies, a first power supply voltage and a second power supply voltage are both present, the third switching circuit 223 outputs one of the first power supply voltage VDDI and the second power supply voltage DVDD to the fourth switching circuit 224 according to the third control command, and the fourth switching circuit 224 outputs the first power supply voltage VDDI as the first voltage or the second power supply voltage DVDD as the second voltage to the input/output interface 21 through a third terminal according to a fourth control command. Alternatively, the fourth switching circuit 224 may output the first power voltage VDDI to the voltage converter through the second end according to a fourth control instruction, and output a second voltage obtained by the conversion to the input/output interface 21.
Therefore, compatibility of different interface voltages under different power supply modes such as three power supplies, four power supplies and the like can be realized.
Fig. 6 shows a schematic diagram of one example of a voltage switching unit of an embodiment of the present disclosure.
In one possible implementation, as shown in fig. 6, the voltage switching unit 22 may include a voltage converter 2203 and a fifth switching circuit 225.
The voltage converter 2203 has an input terminal receiving the first power supply voltage, e.g., VDDI, and an output terminal connected to a first terminal of the fifth switching circuit 225.
The voltage converter 2203 and the voltage converters 2201, 2202 may have the same function, and in one possible implementation, the voltage converter 2203 may select LDO.
A first terminal of the fifth switching circuit 225 is connected to the output terminal of the voltage converter 2203, a second terminal of the fifth switching circuit 225 receives the first power voltage VDDI, a third terminal of the fifth switching circuit 225 receives a second power voltage, such as DVDD, and a fourth terminal of the fifth switching circuit 225 is connected to the input/output interface 21.
In one possible implementation, the fifth switching circuit 225 may include a selector 2250.
The selector 2250 is configured to select the first power voltage VDDI, the second power voltage DVDD, and the second voltage output from the output terminal of the voltage converter 2203, and output the selected result to the input/output interface 21.
The selector 2250 may be a one-out-of-three selector.
In one possible embodiment, the fifth switching circuit 225 may operate at three or four power inputs.
The fifth switching circuit 225 may operate according to a fifth control instruction provided by a register.
There are various embodiments of a circuit of the voltage switching unit 22 shown in fig. 6 in practical use, and the following examples are given:
in a possible embodiment, the voltage switching unit 22 may operate in three power supplies, and the fifth switching circuit 225 outputs the first power supply voltage VDDI as the first voltage or the voltage obtained by converting the first power supply voltage VDDI via the voltage converter 2203 as the second voltage to the input/output interface 21 according to the fifth control instruction.
In a possible embodiment, the voltage switching unit 22 may operate under four power sources, and the fifth switching circuit 225 outputs the first power voltage VDDI as the first voltage, the second power voltage DVDD as the second voltage, or a voltage obtained by converting the first power voltage VDDI through the voltage converter 2203 as the second voltage to the input/output interface 21 according to the fifth control command.
Therefore, the compatibility of different interface voltages under different power supply modes such as three power supplies, four power supplies and the like can be realized.
Those skilled in the art can set the first to fifth control commands as required to make the voltage of the input/output interface 21 meet the requirement.
The foregoing description of the embodiments of the present disclosure has been presented for purposes of illustration and description, but is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims (12)

1. A voltage conversion circuit for a display driver chip, the circuit comprising:
an input/output interface;
and the voltage switching unit is used for receiving a control instruction and a power supply voltage, outputting one of a first voltage and a second voltage according to the control instruction and the power supply voltage, and supplying power to the input and output interface, wherein the first voltage is higher than the second voltage.
2. The circuit of claim 1,
the power supply voltage comprises a first power supply voltage and a second power supply voltage, the first power supply voltage being higher than the second power supply voltage;
the first voltage comprises the first supply voltage;
the second voltage includes a voltage obtained by converting the first power supply voltage, or the second power supply voltage.
3. The circuit of claim 1 or 2, wherein the voltage switching unit comprises a first switching circuit, a first terminal of the first switching circuit receives the first power voltage, a second terminal of the first switching circuit receives the second power voltage, a third terminal of the first switching circuit is connected to the input/output interface,
the first switching circuit outputs the first power supply voltage as a first voltage or outputs the second power supply voltage as a second voltage to the input/output interface through a third end of the first switching circuit according to a received first control instruction.
4. The circuit of claim 1 or 2, wherein the voltage switching unit comprises a second switching circuit, a first terminal of the second switching circuit receives the first power voltage, a second terminal of the second switching circuit is connected to an input terminal of a voltage converter, a third terminal of the second switching circuit and an output terminal of the voltage converter are connected to the input/output interface,
the second switching circuit outputs the first power supply voltage as the first voltage to the input/output interface through the third end according to a received second control instruction, or outputs the first power supply voltage to a voltage converter through the second end for conversion, and outputs a second voltage obtained after conversion to the input/output interface.
5. The circuit according to claim 1 or 2, wherein the voltage switching unit includes a third switching circuit and a fourth switching circuit,
a first terminal of the third switching circuit receives the first power voltage, a second terminal of the third switching circuit receives the second power voltage, a third terminal of the third switching circuit is connected to a first terminal of the fourth switching circuit,
the third switching circuit outputs the first power supply voltage or the second power supply voltage to the first end of the fourth switching circuit through the third end of the third switching circuit according to a received third control instruction;
a first end of the fourth switching circuit receives one of the first power voltage and the second power voltage, a second end of the fourth switching circuit is connected with an input end of a voltage converter, a third end of the fourth switching circuit and an output end of the voltage converter are connected with the input/output interface,
when the first end of the fourth switching circuit receives a first power supply voltage, the fourth switching circuit outputs the first power supply voltage as the first voltage to the input/output interface through the third end according to a received fourth control instruction, or outputs the first power supply voltage to a voltage converter through the second end for conversion, and outputs a second voltage obtained after conversion to the input/output interface;
when the first end of the fourth switching circuit receives a second power voltage, the fourth switching circuit outputs the second power voltage as the second voltage to the input/output interface through a third end according to a received fourth control instruction.
6. The circuit of claim 1 or 2, wherein the voltage switching unit comprises a fifth switching circuit, a first terminal of the fifth switching circuit is connected to the output terminal of the voltage converter, a second terminal of the fifth switching circuit receives a first power voltage, a third terminal of the fifth switching circuit receives a second power voltage, a fourth terminal of the fifth switching circuit is connected to the input/output interface,
wherein the input end of the voltage converter receives the first power supply voltage and outputs a converted second voltage at the output end,
the fifth switching circuit outputs a second voltage output by an output end of the voltage converter to the input/output interface through the fourth end according to a received fifth control instruction, or outputs a first power supply voltage received by the second end to the input/output interface through the fourth end as a first voltage, or outputs a second power supply voltage received by the third end to the input/output interface through the fourth end as a second voltage.
7. The circuit according to any one of claims 1 to 6, wherein the first control instruction, the second control instruction, the third control instruction, the fourth control instruction, and the fifth control instruction are stored by a register and output to the voltage conversion circuit.
8. The circuit of claim 2, wherein the first supply voltage comprises a system I/O interface supply VDDI voltage and the second supply voltage comprises a digital supply DVDD voltage.
9. A display driving chip comprising the voltage conversion circuit according to any one of claims 1 to 8.
10. A display device comprising a display panel and at least one display driver chip according to claim 9.
11. The display device according to claim 10, wherein the display panel comprises at least one of a liquid crystal display panel, a micro light emitting diode display panel, a mini light emitting diode display panel, a quantum dot light emitting diode display panel, and an organic light emitting diode display panel.
12. An information processing apparatus comprising a central processing unit and a display device according to claim 10 or 11, wherein the central processing unit is configured to communicate with the display device.
CN202210470346.2A 2022-04-28 2022-04-28 Voltage conversion circuit, display drive chip, display device, and information processing apparatus Pending CN114974158A (en)

Priority Applications (1)

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CN202210470346.2A CN114974158A (en) 2022-04-28 2022-04-28 Voltage conversion circuit, display drive chip, display device, and information processing apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210470346.2A CN114974158A (en) 2022-04-28 2022-04-28 Voltage conversion circuit, display drive chip, display device, and information processing apparatus

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CN114974158A true CN114974158A (en) 2022-08-30

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