CN215680064U

CN215680064U - Power conversion circuit for Micro OLED screen display driving

Info

Publication number: CN215680064U
Application number: CN202121983279.1U
Authority: CN
Inventors: 刘鑫; 李庚禹; 张明珠; 于杰
Original assignee: Taicang Jiewei Optoelectronic Technology Co ltd
Current assignee: Taicang Jiewei Optoelectronic Technology Co ltd
Priority date: 2021-08-23
Filing date: 2021-08-23
Publication date: 2022-01-28
Anticipated expiration: 2031-08-23

Abstract

A power conversion circuit for display driving of a Micro OLED screen comprises the Micro OLED screen, a Type-C interface, a signal conversion decoding chip, a power module and an MCU control chip; conversion circuit between Type-C interface and the power module comprises voltage conversion circuit one, voltage conversion circuit two and voltage conversion circuit three, voltage conversion circuit one can be with the +5V voltage conversion of Type-C interface +3.3V voltage, voltage conversion circuit two can convert the +5V voltage of Type-C interface into +1.2V voltage and +1.8V voltage, voltage conversion circuit three can convert the +5V voltage of Type-C interface into +6.3V voltage and-4.5V voltage. The power supply conversion circuit for the display drive of the Micro OLED screen realizes the power supply of an AR or VR optical machine display drive system with reasonable electrical element type selection layout and stability and accuracy meeting general requirements, and has the following advantages: the cost is low and the price is low; the circuit is simple, the working efficiency is high, the output power is high, and the performance is excellent; the volume is less, the function is practical, and good human-computer interaction is realized.

Description

Power conversion circuit for Micro OLED screen display driving

Technical Field

The utility model belongs to the technical field of Micro OLED display driving, and particularly relates to a power conversion circuit for Micro OLED screen display driving.

Background

The Augmented Reality (Augmented Reality) technology is a technology for skillfully fusing virtual information and a real world, and is widely applied to the real world after simulating and simulating virtual information such as characters, images, three-dimensional models, music, videos and the like generated by a computer by using various technical means such as multimedia, three-dimensional modeling, real-time tracking and registration, intelligent interaction, sensing and the like, wherein the two kinds of information supplement each other, so that the real world is enhanced. Virtual Reality technology (abbreviated as VR) encompasses computer, electronic information, simulation technology, and its basic implementation is that a computer simulates a Virtual environment to give a sense of environmental immersion.

Micro OLED (organic light emitting diode) is a display device for augmented reality and virtual reality technologies, has the advantages of active light emitting, light weight, thin thickness, fast response and high efficiency, can work in various severe environments, and is widely applied to the field of display technologies in recent years. In order to flexibly display more images and text information, the Micro OLED display screen is usually manufactured into a dot matrix structure, and a dot matrix image with gray scale is formed by controlling the brightness of each dot.

In order to ensure the Micro OLED display and perform normal display, a reasonable system board is required to implement the display, and the supply of power on the system board is an important guarantee for the Micro OLED display. Although various circuit configurations have been proposed in the prior art, there is a need for a power supply circuit that is inexpensive and functionally practical due to various problems such as an excessively high price and a large volume.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: the utility model aims to provide a power conversion circuit for Micro OLED screen display driving, which solves the problems of high cost and unstable performance caused by unreasonable design of a power supply part for Micro OLED screen display driving in the prior art.

The technical scheme is as follows: the utility model provides a power conversion circuit for display driving of a Micro OLED screen, which comprises the Micro OLED screen, a Type-C interface, a signal conversion decoding chip, a power module and an MCU control chip, wherein the MCU control chip is connected with the power module; the conversion circuit between the Type-C interface and the power module is composed of a first voltage conversion circuit, a second voltage conversion circuit and a third voltage conversion circuit, wherein the first voltage conversion circuit can convert +5V voltage of the Type-C interface into +3.3V voltage, the second voltage conversion circuit can convert +5V voltage of the Type-C interface into +1.2V voltage and +1.8V voltage, and the third voltage conversion circuit can convert +5V voltage of the Type-C interface into +6.3V voltage and-4.5V voltage.

Further, the power conversion circuit for driving the Micro OLED screen display comprises a first voltage regulator, a fuse, a capacitor C51, a capacitor C70 and a resistor R25.

Further, the power conversion circuit for driving the Micro OLED screen display comprises a +1.2V voltage conversion circuit and a +1.8V voltage conversion circuit, wherein the +1.8V voltage conversion circuit comprises a synchronous buck regulator, a capacitor C71, a capacitor C63, a resistor R27, an inductor L4, a resistor R21, a capacitor C62, a capacitor C64, a magnetic bead FB5, and a magnetic bead FB 6; the +1.2V voltage conversion circuit comprises a resistor R26, an inductor L5, a resistor R22, a capacitor C66, a capacitor C65, a magnetic bead FB1, a magnetic bead FB2, a magnetic bead FB3 and a magnetic bead FB 4.

Further, the third voltage conversion circuit comprises a dual-channel switching regulator, a capacitor C61, a capacitor C59, a capacitor C60, a resistor R19, a resistor R16, an inductor L1, an inductor L2, a diode D3, a capacitor C53, a resistor R12, a capacitor C54, a resistor R13, a capacitor C56, a resistor R14, a resistor R15, a capacitor C58, an inductor L3, a capacitor C57, a diode D4 and a capacitor C55.

Furthermore, in the power conversion circuit for driving the Micro OLED screen display, the first voltage stabilizer is LT 1117.

Further, in the power conversion circuit for the Micro OLED screen display driver, the model of the synchronous buck regulator is MPQ 2122.

Further, in the power conversion circuit for driving the Micro OLED screen display, the dual-channel switching regulator is LT 3471.

The technical scheme shows that the utility model has the following beneficial effects: the power supply conversion circuit for the display driving of the Micro OLED screen realizes the power supply of an AR or VR optical machine display driving system with reasonable electrical element type selection layout, practical functions, stability and accuracy meeting the general requirements, and has the following advantages: (1) the cost is low and the price is low; (2) the circuit is simple, the power conversion efficiency is high, the performance is excellent, and the power consumption is low; (3) the device packaging volume is small, and the six layers of PCB boards are designed in a laminated manner, so that the space cost is saved, and the layout is optimized; (4) the electromagnetic interference EMI is smaller, and the signal transmission quality is excellent.

Drawings

FIG. 1 is a block diagram of an AR or VR electro-mechanical display drive system in accordance with the present invention;

FIG. 2 is an electrical schematic diagram of an AR or VR opto-mechanical display drive system in accordance with the present invention;

FIG. 3 is a circuit diagram of a first voltage conversion circuit according to the present invention;

FIG. 4 is a circuit diagram of a second voltage conversion circuit according to the present invention;

fig. 5 is a circuit diagram of a third voltage conversion circuit according to the present invention.

In the figure: micro OLED screen 1, Type-C interface 2, signal conversion decode chip 3, power module 4, stabiliser 41, synchronous buck regulator 42, binary channels switching regulator 43, MCU control chip 5, voltage conversion circuit 6, voltage conversion circuit two 7, voltage conversion circuit three 8.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Examples

As Micro OLED screen that fig. 1 shows driven power conversion circuit, including Micro OLED screen 1, Type-C interface 2, signal conversion decode chip 3, power module 4 and MCU control chip 5, Type-C interface 2 provides +5V voltage for the system board through the VBUS pin to Type-C interface 2 can accept the video and/or audio signal of external equipment, Type-C interface 2 and signal conversion decode chip 3 and connect, and Type-C interface 2 provides the power for power module 4, power module 4 provides the power for Micro OLED screen 1, signal conversion decode chip 3 and MCU control chip 5 and be connected with Micro OLED screen 1, MCU control chip 5 and Micro OLED screen 1 are connected.

The Type-C interface 2 is arranged on the display driving system board main body, provides +5V voltage for the system board through a VBUS pin, and is used for receiving video/audio signals of external equipment.

The signal conversion decoding chip 3 is arranged on the display driving system board main body, receives the video/audio signal from the Type-C interface 2 and converts the video/audio signal into an MIPI format signal required by a VR/AR display; and is connected with the MCU control chip 5 through an I2C bus; the +3.3V and +1.2V voltages required by the operation of the power supply are provided by a power supply module on the driving plate.

On power module 4 located the display drive board main part, by Type-C interface 2 input +5V voltage, generate AVDD & AVEE voltage drive Micro OLED screen 1 through the DCDC chip conversion, generate the required voltage of signal conversion decoder chip 3 and the work of MCU control chip 5 simultaneously.

The MCU control chip 5 is arranged on the display driving board main body, the working voltage is generated by the power supply module 4, and the signal conversion decoding chip 3 is connected through an I2C bus.

Wherein, power module 4 includes stabiliser one 41, synchronous buck regulator 42 and binary channels switching regulator 43, Type-C interface 2 is connected with stabiliser one 41, synchronous buck regulator 42 and binary channels switching regulator 43 respectively to Type-C interface 2 provides +5V voltage for stabiliser one 41, synchronous buck regulator 42 and binary channels switching regulator 43. Type-C interface 2 converts +3.3V voltage into through stabiliser one 41, Type-C interface 2 converts +1.2V voltage and +1.8V voltage into through synchronous buck regulator 42, Type-C interface 2 converts +6.3V voltage and-4.5V voltage into through binary channels switching regulator 43. The +3.3V voltage output by the first voltage stabilizer 41 and the +1.2V voltage output by the synchronous buck regulator 42 are respectively connected with a power supply pin of the signal conversion decoding chip 3, and the +1.8V voltage of the synchronous buck regulator 42 is respectively connected with a power supply pin of the Micro OLED screen 1 and a power supply pin of the MCU control chip 5. The +6.3V voltage and the-4.5V voltage of the dual-channel switching regulator 43 are respectively connected with the Micro OLED screen 1.

In addition, the Type-C interface 2 receives video and/or audio signals and converts the video and/or audio signals into MIPI format signals required by the Micro OLED screen 1. The Type-C interface 2 is connected with the MCU control chip 5 through an I2C bus.

Example two

Based on the driving system of embodiment one, Type-C interface 2 and power module 4 comprise voltage conversion circuit 6, voltage conversion circuit two 7 and voltage conversion circuit three 8, voltage conversion circuit 6 can convert Type-C interface 2's +5V voltage into +3.3V voltage, voltage conversion circuit two 7 can convert Type-C interface 2's +5V voltage into +1.2V voltage and +1.8V voltage, voltage conversion circuit three 8 can convert Type-C interface 2's +5V voltage into +6.3V voltage and-4.5V voltage.

The first voltage conversion circuit 6 shown in fig. 3 includes a first voltage regulator 41, a fuse 61, a capacitor C51, a capacitor C70, and a resistor R25. The VBUS pin of the Type-C interface 2 is connected with one end of the fuse 61, the other end of the fuse 61 is connected to the IN pin of the first voltage stabilizer 41, the OUT pin of the first voltage stabilizer 41 is connected with one end of the resistor R25, and the other end of the resistor R25 is connected to the pin of the signal conversion decoding chip 3. One end of the capacitor C51 is connected with a line between the fuse 61 and the first voltage regulator 41, one end of the capacitor C70 is connected with a line between the resistor R25 and the first voltage regulator 41, and the other end of the capacitor C51, the other end of the capacitor C70 and a GND pin of the first voltage regulator 41 are all connected with the ground.

The second voltage converting circuit 7 shown in fig. 4 includes a +1.2V voltage converting circuit and a +1.8V voltage converting circuit, where the +1.8V voltage converting circuit includes a synchronous buck regulator 42, a capacitor C71, a capacitor C63, a resistor R27, an inductor L4, a resistor R21, a capacitor C62, a capacitor C64, a magnetic bead FB5, and a magnetic bead FB 6; the +1.2V voltage conversion circuit comprises a resistor R26, an inductor L5, a resistor R22, a capacitor C66, a capacitor C65, a magnetic bead FB1, a magnetic bead FB2, a magnetic bead FB3 and a magnetic bead FB 4. The 5V power supply provided by the Type-C interface 2 is connected to the IN pin of the synchronous buck regulator 42, one ends of a capacitor C71 and a capacitor C63 are connected IN a line between the Type-C interface 2 and the synchronous buck regulator 42, the other ends of a capacitor C71 and a capacitor C63 are connected with the ground, and the capacitor C71 and the capacitor C63 are connected IN parallel. The resistor R26 is connected with an EN2 pin of the synchronous buck regulator 42, the inductor L5 is connected with an SW2 pin of the synchronous buck regulator 42, the resistor R22 is connected with an FB2 pin of the synchronous buck regulator 42, the resistor R22 is connected with the inductor L5 in parallel, one ends of the capacitor C66 and the capacitor C65 are connected with one end of the inductor L5, the other ends of the capacitor C66 and the capacitor C65 are connected with the ground, the capacitor C66 is connected with the capacitor C65 in parallel, and a circuit formed by connecting the inductor L5 with the capacitor C66 and the capacitor C6 is connected with four magnetic beads FB1, FB2, FB3 and FB4, and FB1, the magnetic beads FB2, FB3 and FB4 in parallel. One end of the resistor R27 is connected with the +5V voltage of the Type-C interface 2, the other end of the resistor R27 is connected with an EN1 pin of the synchronous buck regulator 42, one end of the inductor L4 is connected with an SW1 pin of the synchronous buck regulator 42, one end of the resistor R21 is connected with an FB1 pin of the synchronous buck regulator 42, the resistor R21 is connected in parallel with the inductor L4, the capacitor C62 is connected in parallel with the capacitor C64, one end of the capacitor C62, which is connected in parallel with the capacitor C64, is connected with the other end of the inductor L4, the other end of the capacitor C62, which is connected in parallel with the capacitor C64, is connected with the ground, a line formed by connecting the inductor L4 with the capacitor C62 and the capacitor C64 is connected with two magnetic beads FB5 and a magnetic bead FB6, a resistor R20 is connected between one end of the resistor R21 and an FB1 pin of the synchronous buck regulator 42 and the ground, a resistor R23 is connected between one end of the resistor R22 and an FB2 pin of the synchronous buck regulator 42 and the ground, and a GND pin of the synchronous buck regulator 42 is connected with the ground.

The voltage conversion circuit three 8 shown in fig. 5 includes a dual-channel switching regulator 43, a capacitor C61, a capacitor C59, a capacitor C60, a resistor R19, a resistor R16, an inductor L1, an inductor L2, a diode D3, a capacitor C53, a resistor R12, a capacitor C54, a resistor R13, a capacitor C56, a resistor R14, a resistor R15, a capacitor C58, an inductor L3, a capacitor C57, a diode D4, and a capacitor C55. Pin SW1 of dual channel switching regulator 43 is connected to +5V of Type-C interface 2 through inductor L1, pin VIN of dual channel switching regulator 43 is connected to +5V of Type-C interface 2, pin SW2 of dual channel switching regulator 43 is connected to +5V of Type-C interface 2 through inductor L2, one end of capacitor C61 is connected to the line between VIN pin of dual channel switching regulator 43 and +5V of Type-C interface 2, and the other end of capacitor C61 is connected to ground, one end of resistor R19 is connected to pin SHDN/1 of dual channel switching regulator 43, one end of capacitor C60 is connected to the other end of resistor R19, and the other end of capacitor C60 is connected to ground, one end of resistor R16 is connected to pin SHDN/SS2 of dual channel switching regulator 43, one end of capacitor C59 is connected to the other end of resistor R16, and the other end of the capacitor C59 is connected to ground, one end of the diode D3 is connected to a line between the inductor L1 and the SW1 pin of the dual-channel switching regulator 43, one end of the resistor R13 is connected to the FB1N pin of the dual-channel switching regulator 43, the diode D3 is connected to a line parallel resistor R12 and a capacitor C53 between one end of the resistor R13 and the FB1N pin of the dual-channel switching regulator 43, the other end of the resistor R13, the other end of the diode D3 and the capacitor C54 are connected in series, one end of the capacitor C56 is connected to the second end, the other end of the capacitor C56 is connected to the FB1P pin of the dual-channel switching regulator 43, one end of the resistor R14 is connected to the VREF pin of the dual-channel switching regulator 43, the other end of the resistor R14 is connected to one end of the resistor R15 and the capacitor C58 in parallel, the intersection of the resistor R14, the resistor R15 and the capacitor C58 are connected to the FB2 pin 2P of the dual-channel switching regulator 3643, and the ground are connected to the regulator 2N, the other end of the resistor R15 connected in parallel with the capacitor C58 is connected with one end of an inductor L3, the other end of the inductor L3 is connected with a line between the capacitor C57 and the diode D4, the other end of the capacitor C57 is connected with a line between a SW2 pin of the dual-channel switching regulator 43 and the inductor L2, the other end of the diode D4 is connected with the ground, the other end of the resistor R15 connected in parallel with the capacitor C58 is connected with a line connected with the inductor L3 and the capacitor C55, the other end of the capacitor C55 is connected with the ground, and a GND pin of the dual-channel switching regulator 43 is connected with the ground.

The types of the electric elements related to the signal conversion decoding chip 3, the power supply module 4 and the MCU control chip 5 are LT 7911D; the model of the MCU control chip 5 is STM 8L; the model of the first voltage stabilizer 41 is LT 1117; the synchronous buck regulator 42 is of the model MPQ 2122; the dual channel switching regulator 43 is model LT 3471.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the present invention, and these modifications should also be construed as the protection scope of the present invention.

Claims

1. A power conversion circuit for Micro OLED screen display driving is characterized in that: the device comprises a Micro OLED screen (1), a Type-C interface (2), a signal conversion decoding chip (3), a power supply module (4) and an MCU control chip (5);

the conversion circuit between the Type-C interface (2) and the power module (4) is composed of a first voltage conversion circuit (6), a second voltage conversion circuit (7) and a third voltage conversion circuit (8), wherein the first voltage conversion circuit (6) can convert the +5V voltage of the Type-C interface (2) into +3.3V voltage, the second voltage conversion circuit (7) can convert the +5V voltage of the Type-C interface (2) into +1.2V voltage and +1.8V voltage, and the third voltage conversion circuit (8) can convert the +5V voltage of the Type-C interface (2) into +6.3V voltage and-4.5V voltage.

2. The Micro OLED screen display driving power conversion circuit of claim 1, wherein: the first voltage conversion circuit (6) comprises a first voltage stabilizer (41), a fuse (61), a capacitor C51, a capacitor C70 and a resistor R25.

3. The Micro OLED screen display driving power conversion circuit of claim 1, wherein: the second voltage conversion circuit (7) comprises a +1.2V voltage conversion circuit and a +1.8V voltage conversion circuit, and the +1.8V voltage conversion circuit comprises a synchronous buck regulator (42), a capacitor C71, a capacitor C63, a resistor R27, an inductor L4, a resistor R21, a capacitor C62, a capacitor C64, a magnetic bead FB5 and a magnetic bead FB 6; the +1.2V voltage conversion circuit comprises a resistor R26, an inductor L5, a resistor R22, a capacitor C66, a capacitor C65, a magnetic bead FB1, a magnetic bead FB2, a magnetic bead FB3 and a magnetic bead FB 4.

4. The Micro OLED screen display driving power conversion circuit of claim 1, wherein: the third voltage conversion circuit (8) comprises a dual-channel switching regulator (43), a capacitor C61, a capacitor C59, a capacitor C60, a resistor R19, a resistor R16, an inductor L1, an inductor L2, a diode D3, a capacitor C53, a resistor R12, a capacitor C54, a resistor R13, a capacitor C56, a resistor R14, a resistor R15, a capacitor C58, an inductor L3, a capacitor C57, a diode D4 and a capacitor C55.

5. The Micro OLED screen display driving power conversion circuit of claim 2, wherein: the model of the first voltage stabilizer (41) is LT 1117.

6. The Micro OLED screen display driving power conversion circuit of claim 3, wherein: the synchronous buck regulator (42) is of the type MPQ 2122.

7. The Micro OLED screen display driving power conversion circuit of claim 4, wherein: the dual-channel switching regulator (43) is LT 3471.