CN111158152A - Head-mounted display device and DLP projection system - Google Patents

Head-mounted display device and DLP projection system Download PDF

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Publication number
CN111158152A
CN111158152A CN202010096962.7A CN202010096962A CN111158152A CN 111158152 A CN111158152 A CN 111158152A CN 202010096962 A CN202010096962 A CN 202010096962A CN 111158152 A CN111158152 A CN 111158152A
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CN
China
Prior art keywords
power supply
switch
voltage
driving unit
interface
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Pending
Application number
CN202010096962.7A
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Chinese (zh)
Inventor
黄凯
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Guangdong Oppo Mobile Telecommunications Corp Ltd filed Critical Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority to CN202010096962.7A priority Critical patent/CN111158152A/en
Publication of CN111158152A publication Critical patent/CN111158152A/en
Priority to PCT/CN2021/070688 priority patent/WO2021164453A1/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/017—Head mounted
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/0816—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements
    • G02B26/0833—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements the reflecting element being a micromechanical device, e.g. a MEMS mirror, DMD
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/005—Projectors using an electronic spatial light modulator but not peculiar thereto
    • G03B21/008—Projectors using an electronic spatial light modulator but not peculiar thereto using micromirror devices

Abstract

The present disclosure provides a head mounted display device and a DLP projection system. The head-mounted display device includes: a digital micromirror unit; the power supply driving unit is connected with the digital micromirror unit and used for providing driving voltage for the digital micromirror unit; a first protection circuit; the first power supply circuit is connected with the power supply driving unit through the first protection circuit and used for providing a first input voltage for the power supply driving unit; the first protection circuit is used for preventing current from flowing from the power supply driving unit to the first power supply circuit when the first power supply circuit is abnormally powered.

Description

Head-mounted display device and DLP projection system
Technical Field
The utility model relates to a wearable equipment technical field especially relates to a wear-type display device and DLP projection system.
Background
The head-mounted device can achieve different effects such as Virtual Reality (VR), Augmented Reality (AR), Mixed Reality (MR) and the like by sending optical signals to eyes, such as VR glasses, AR glasses, MR glasses and the like.
The head-mounted device generally includes a display module, a processing module, a camera module, an induction module, a power supply module, and the like. The display module includes a micro display, such as a micro display using DLP (Digital Light Processing) based technology.
The DLP micro display screen includes: the Digital Micro Mirror Device comprises a light source, an optical system, a Digital Micro Mirror Device (DMD), a power driving chip of the DMD and a control chip.
Light emitted from the light source is converted into an image signal by an optical component in the optical system. A lens in the optical system transmits the image signal to the DMD. The DMD reflects the image signal transmitted by the lens to the projection lens, and the projection lens projects the image signal reflected by the DMD to a screen for display.
The power driving chip is used for providing driving voltage for the DMD to supply power for the DMD. The control chip is used for controlling the DMD and the light source to work cooperatively.
DMD devices are the basis for DLP technology. A DMD can be described simply as a semiconductor optical switch, which operates on the principle of reflecting the desired light by means of micro-mirror devices, while absorbing the undesired light by means of optical absorbers to effect the projection of the influence. The illumination direction is realized by controlling the angle of the micro lens by means of electrostatic action.
However, in the related art, the power supply chip of the DMD receives a voltage provided by a power source (e.g., a battery) in an external system as a driving voltage of the DMD. When the external power supply is abnormally powered off, if the battery is suddenly pulled off, the power supply chip can be quickly powered off, so that the DMD is damaged.
It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.
Disclosure of Invention
The present disclosure is directed to a head-mounted display device and a DLP projection system, which at least partially overcome the problem of DMD damage caused by abnormal power supply circuit in the head-mounted display device in the related art.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows, or in part will be obvious from the description, or may be learned by practice of the disclosure.
According to an aspect of the present disclosure, there is provided a head-mounted display device including: a digital micromirror unit; the power supply driving unit is connected with the digital micromirror unit and used for providing driving voltage for the digital micromirror unit; a first protection circuit; the first power supply circuit is connected with the power supply driving unit through the first protection circuit and used for providing a first input voltage for the power supply driving unit; the first protection circuit is used for preventing current from flowing from the power supply driving unit to the first power supply circuit when the first power supply circuit is abnormally powered.
According to another aspect of the present disclosure, there is provided a head-mounted display device including: a digital micromirror unit; the power supply driving unit is connected with the digital micromirror unit and used for providing driving voltage for the digital micromirror unit; the first power supply circuit is connected with the power supply driving unit and used for providing a first input voltage for the power supply driving unit; and one end of the first capacitor is connected between the first power supply circuit and the power supply driving unit, and the other end of the first capacitor is grounded.
According to yet another aspect of the present disclosure, there is provided a DLP projection system comprising: a digital micromirror unit; a first interface; a first protection circuit; the power supply driving unit is connected with the digital micromirror unit, is connected with the first interface through the first protection circuit, and is used for providing driving voltage for the digital micromirror unit and receiving first input voltage provided by an external first power supply circuit through the first interface; the first protection circuit is used for preventing current from flowing from the power supply driving unit to the first power supply circuit when the first power supply circuit is abnormally powered.
According to yet another aspect of the present disclosure, there is provided a DLP projection system comprising: a digital micromirror unit; a first interface; the power supply driving unit is respectively connected with the digital micromirror unit and the first interface, and is used for providing driving voltage for the digital micromirror unit and receiving first input voltage provided by an external first power supply circuit through the first interface; and one end of the first capacitor is connected between the first interface and the power supply driving unit, and the other end of the first capacitor is grounded.
The head-mounted display device provided by the embodiment of the disclosure stops the reverse flow of current through the protection circuit when the power supply circuit is abnormal, so that the input voltage of the power supply driving unit slowly drops, and can be kept for a period of time. In this period, the driving voltage output by the power driving unit can be reset normally, thereby ensuring that the DMD is not damaged.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.
FIG. 1 is a block diagram illustrating a head mounted display device according to an example embodiment.
Fig. 2 shows a block diagram of a head mounted display device in an embodiment of the disclosure.
Fig. 3A and 3B respectively show block diagrams of head mounted display devices provided according to different exemplary embodiments.
Fig. 4 shows a block diagram of another head mounted display device in an embodiment of the disclosure.
Fig. 5A and 5B respectively show block diagrams of head mounted display devices provided according to different exemplary embodiments.
Fig. 6 shows a block diagram of a head mounted display device in yet another embodiment of the disclosure.
Fig. 7A to 7C respectively show block diagrams of head mounted display devices provided according to different exemplary embodiments.
Fig. 8A is a circuit schematic diagram illustrating a voltage detection unit 45 according to an exemplary embodiment.
Fig. 8B is a circuit schematic of the voltage monitoring circuit 451 shown in accordance with an example embodiment.
Fig. 9 is a circuit schematic diagram illustrating one type of switch S1 according to an example embodiment.
Fig. 10 is a circuit schematic diagram illustrating one type of switch S2 according to an exemplary embodiment.
Fig. 11 shows a block diagram of a head mounted display device in yet another embodiment of the disclosure.
Fig. 12 shows a block diagram of a head mounted display device in an embodiment of the present disclosure.
Fig. 13 shows a block diagram of a head mounted display device in yet another embodiment of the disclosure.
Fig. 14 shows a block diagram of a DLP projection system in an embodiment of the present disclosure.
Fig. 15A to 15C respectively show block diagrams of DLP projection systems provided according to different exemplary embodiments.
FIG. 16 shows a block diagram of yet another DLP projection system in an embodiment of the present disclosure.
Fig. 17A to 17E respectively show block diagrams of DLP projection systems provided according to different exemplary embodiments.
FIG. 18 shows a block diagram of yet another DLP projection system in an embodiment of the present disclosure.
FIG. 19 illustrates a block diagram of yet another DLP projection system in an embodiment of the present disclosure.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted. Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities. These functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices.
In the present disclosure, unless expressly stated or limited otherwise, the terms "connected," "connecting," and the like are to be construed broadly, e.g., as meaning as being mechanically coupled, electrically coupled, or in communication with one another; they may be directly connected or indirectly connected through intervening media, or may be connected through the interconnection of two elements or through the interaction of two elements. The specific meaning of the above terms in the present disclosure can be understood by those of ordinary skill in the art as appropriate.
Furthermore, in the description of the present disclosure, the terms "first" and "second" 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.
FIG. 1 is a block diagram illustrating a head mounted display device according to an example embodiment.
As shown in fig. 1, the head-mounted display apparatus 1 includes: battery 11, power management unit 12, power driving unit 13, and DMD 14.
The power driving unit 13 is connected to the DMD 14, and is used for providing driving voltages (such as voltages VBIAS, VRST, and VOFS in the figure) for the DMD 14.
The power supply of the power supply drive unit 13 is provided by the battery 11. The voltage SYSPWR (2.3V-5.5V) output by the battery 11 is directly supplied to the power driving unit 13; the other path is input to the power management unit 12, and the power management unit 12 converts the voltage into a voltage of 1.8V and supplies the voltage to the power driving unit 13.
If an abnormal power failure of the circuit occurs (e.g., the battery 11 is suddenly unplugged), the power driving unit 13 may rapidly power down the power driving unit 13 due to a reverse current flow to the power supply terminals (the battery 11 and the power management unit 12). When the power driving unit 13 is powered down rapidly, the driving voltages VBIAS, VRST and VOFS output by the power driving unit cannot be reset normally, thereby causing damage to the DMD.
In order to ensure that when the power supply terminal is abnormal, the power driving unit 13 does not rapidly power down to cause damage to the DMD, in the head-mounted display device and the DLP projection system provided by the embodiment of the present disclosure, by adding a protection circuit, it is ensured that when the power supply terminal circuit is abnormal, the input voltage of the power driving unit slowly powers down, and the power driving unit can be maintained for a period of time. In this period, the three driving voltages VBIAS, VRST and VOFS output by the power driving unit can be reset normally, and the DMD module is guaranteed not to be damaged.
Hereinafter, a head-mounted display device and a DLP projection system according to exemplary embodiments of the present disclosure will be described in more detail with reference to the drawings and the embodiments.
Fig. 2 shows a block diagram of a head mounted display device in an embodiment of the disclosure.
Referring to fig. 2, the head mounted display apparatus 2 includes: a power supply circuit 21A, a protection circuit 22A, a power driving unit 23, and a DMD 24.
The head-mounted display device 2 provided by the embodiment of the disclosure adopts a micro display screen based on the DLP technology, and the light emitted by the light source reaches the DMD24 through an optical system. The light is emitted by the DMD24 to form display content, which is projected onto a screen through a projection lens for display.
The projection principles of DLP technology are well known to those skilled in the art and will not be described in detail herein to avoid obscuring the present invention.
As shown in fig. 2, the power driving unit 23 is connected to the DMD24 for supplying the driving voltage Vd to the DMD 24. The driving voltage Vd may include, for example, the voltages VBIAS, VRST and VOFS shown in fig. 1, but the disclosure is not limited thereto, and may be determined according to actual requirements in specific applications. The DMD24 operates based on the driving of the driving voltage.
The power supply circuit 21A is connected to the power supply driving unit 23 through the protection circuit 22A, and is configured to provide the input voltage V to the power supply driving unit 23.
In order to avoid the power supply driving unit 23 from being powered down rapidly due to the abnormality of the power supply circuit 21A, the protection circuit 22A may prevent the current from flowing from the power supply driving unit 23 to the power supply circuit 21A, i.e., prevent the current from flowing in the reverse direction, when the power supply circuit 21A is in the abnormal power supply state. The case where the power supply of the power supply circuit 21A is abnormal may include, for example: the power source (e.g., battery) in the power supply circuit 21A is unplugged, or the line in the power supply circuit 21A is suddenly cut off, etc.
As mentioned above, when the power supply circuit supplies power abnormally, the power driving unit may generate reverse current, which causes the input voltage of the power driving unit to power down quickly, so that the driving voltage output by the power driving unit cannot be reset normally, thereby damaging the DMD.
In the embodiment of the present disclosure, the protection circuit 22A may prevent the reverse current from flowing, so that the input voltage of the power driving unit 23 may be slowly decreased and maintained for a period of time. During this time, the driving voltage Vd output by the power driving unit 23 can be normally reset, ensuring that the DMD24 is not damaged.
Fig. 3A and 3B respectively show block diagrams of head mounted display devices provided according to different exemplary embodiments.
Referring to fig. 3A, in the head mounted display device 2A, the protection circuit 22A may be implemented as a diode D. The diode D has a positive pole (+) connected to the power supply system 21A and a negative pole (-) connected to the power supply driving unit 23. Due to the nature of the diode device, current is only allowed to flow from its positive pole to its negative pole. When the power supply circuit 21A is abnormal, the current of the power supply driving unit 23 can be prevented from flowing to the power supply circuit 21A, and the input voltage of the power supply driving unit 23 is prevented from being quickly exhausted, so that the power supply driving unit 23 is slowly powered off, and the purpose of protecting the DMD is achieved.
Referring to fig. 3B, in the head mounted display device 2B, the protection circuit 22A may be implemented as a load switch S. Further, the head mounted display device 2B further includes: and a voltage detection unit 25.
The voltage detection unit 25 is connected between the power supply circuit 21A and the switch S. In the process that the power supply circuit 21A supplies the input voltage to the power supply driving unit 23, the voltage detecting unit 25 detects whether the voltage V output by the power supply circuit 21A is lower than a preset voltage threshold Vh. When the voltage V is lower than the voltage threshold Vh, the control switch S is turned off, thereby preventing the reverse flow of current in the power driving unit 23, ensuring that the input voltage thereof is not rapidly powered down, and further protecting the DMD24 from being damaged.
The voltage detection unit 25 may control the off switch S by sending a control signal, for example.
The voltage detection unit 25 may be implemented by a voltage monitoring circuit 451 as shown in fig. 8B, for example. The switch S may be implemented as a small ultra low on-resistance load switch U1 with controlled turn-on functionality in fig. 9.
Fig. 4 shows a block diagram of another head mounted display device in an embodiment of the disclosure.
Unlike the head mounted display apparatus 2 shown in fig. 2, the head mounted display apparatus 3 further includes, as shown in fig. 4: a power supply circuit 21B and a protection circuit 22B. That is, in the embodiment shown in fig. 4, the power driving unit 23 needs two power supply circuits to provide different input voltages for it. The power supply circuit 21A provides the input voltage V1 to the power driving unit 23. The power supply circuit 21B is connected to the power supply driving unit 23 through the protection circuit 22B, and supplies the input voltage V2 to the power supply driving unit 23.
The protection circuit 22B is configured to prevent a current from flowing from the power supply drive unit 23 to the power supply circuit 21B when the power supply from the power supply circuit 21B is abnormal. The case where the power supply circuit 21B is abnormally supplied may include, for example: the power source (e.g., battery) in the power supply circuit 21B is unplugged, or the line in the power supply circuit 21B is suddenly cut off, etc.
Fig. 5A and 5B respectively show block diagrams of head mounted display devices provided according to different exemplary embodiments.
Referring to fig. 5A, in the head mounted display device 3A, the protection circuit 22A and the protection circuit 22B may be implemented as a diode D1 and a diode D2, respectively. The diode D1 has its anode (+) connected to the power supply system 21A and its cathode (-) connected to the power drive unit 23. The diode D2 has a positive pole (+) connected to the power supply system 21B and a negative pole (-) connected to the power supply driving unit 23.
Due to the nature of the diode device, current is only allowed to flow from its positive pole to its negative pole. When the power supply circuit 21A and/or the power supply system 21B supply power abnormally, the current of the power driving unit 23 can be prevented from flowing to the power supply circuit 21A and/or the power supply system 21B, and the input voltage of the power driving unit 23 is prevented from being quickly exhausted, so that the purposes of slowly powering down the power driving unit 23 and protecting the DMD are achieved.
Referring to fig. 5B, in the head mounted display device 3B, the protection circuit 22A and the protection circuit 22B may be implemented as a load switch S1 and a load switch S2, respectively.
Further, the head mounted display device 3B further includes: a voltage detection unit 25A and a voltage detection unit 25B.
The voltage detection unit 25A is connected between the power supply circuit 21A and the switch S1. In the process of supplying the input voltage to the power driving unit 23 by the power supply circuit 21A, the voltage detecting unit 25A detects whether the voltage V1 output by the power supply circuit 21A is lower than a preset voltage threshold Vh 1. When the voltage V1 is lower than the voltage threshold Vh1, the control switch S1 is turned off, so as to prevent the reverse flow of current in the power driving unit 23, ensure that the input voltage thereof is not rapidly powered down, and protect the DMD24 from being damaged.
The voltage detection unit 25B is connected between the power supply circuit 21B and the switch S2. In the process that the power supply circuit 21B supplies the input voltage to the power supply driving unit 23, the voltage detecting unit 25B detects whether the voltage V2 output by the power supply circuit 21B is lower than a preset voltage threshold Vh 2. When the voltage V2 is lower than the voltage threshold Vh2, the control switch S2 is turned off, so as to prevent the reverse flow of current in the power driving unit 23, ensure that the input voltage thereof is not rapidly powered down, and protect the DMD24 from being damaged.
The voltage detection unit 25A and the voltage detection unit 25B may control to turn off the switch S1 and the switch S2 by sending control signals, for example.
Among them, the voltage detection unit 25A and the voltage detection unit 25B may be implemented by, for example, a voltage monitoring circuit 451 as shown in fig. 8B. The switch S1 and the switch S2 may be implemented as a small ultra low on-resistance load switch U1 with controlled turn-on functionality in fig. 9.
Fig. 6 shows a block diagram of a head mounted display device in yet another embodiment of the disclosure.
Referring to fig. 6, unlike the head mounted display apparatus 3 shown in fig. 4, the power supply circuit 21A in the head mounted display apparatus 4 includes: a battery 211; the power supply circuit 21B includes: a battery 211 and a power management unit 212.
The battery 211 is connected to the power driving unit 23 through the protection circuit 22A, and supplies an input voltage V1 thereto.
The power management unit 212 is connected between the battery 211 and the protection circuit 22B, receives the voltage V1 output from the battery 211, converts the voltage V1 into a voltage V2. The voltage V2 is supplied to the power supply driving unit 23 as another input voltage of the power supply driving unit 23.
The power management unit 212 may include a voltage conversion circuit for converting the voltage output from the battery 211. The voltage conversion circuit may include, for example, a BUCK step-down circuit or a charge pump (charge pump) circuit.
Fig. 7A to 7C respectively show block diagrams of head mounted display devices provided according to different exemplary embodiments.
Referring to fig. 7A, in the head mounted display device 4A, the protection circuit 22A and the protection circuit 22B may be implemented as a diode D1 and a diode D2, respectively. The diode D1 has its anode (+) connected to the power supply system 21A and its cathode (-) connected to the power drive unit 23. The diode D2 has a positive pole (+) connected to the power supply system 21B and a negative pole (-) connected to the power supply driving unit 23.
Due to the nature of the diode device, current is only allowed to flow from its positive pole to its negative pole. When the power supply of the power supply circuit 21A and/or the power supply system 21B is abnormal due to the sudden removal of the battery 211 or the failure of the power management unit 212, the current of the power driving unit 23 can be prevented from flowing to the power supply circuit 21A and/or the power supply system 21B, and the input voltage of the power driving unit 23 is prevented from being quickly exhausted, so that the purposes of slowly powering off the power driving unit 23 and protecting the DMD are achieved.
Referring to fig. 7B, in the head mounted display device 4B, the protection circuit 22A and the protection circuit 22B may be implemented as a load switch S1 and a load switch S2, respectively.
Further, the head mounted display device 4B further includes: a voltage detection unit 45.
The voltage detection unit 45 is connected to the battery 211, the switch S1, and the switch S2, respectively. In the process that the battery 211 provides the input voltage V1 to the power driving unit 23 and the input voltage V2 through the power management unit 212, the voltage detection unit 45 detects whether the voltage V1 output by the battery 211 is lower than the preset voltage threshold Vhb. When the voltage V1 is lower than the voltage threshold Vhb, the switch S1 and the switch S2 are controlled to be turned off, so as to prevent the reverse flow of current in the power driving unit 23, ensure that the input voltage thereof is not rapidly powered down, and further protect the DMD24 from being damaged.
The voltage detection unit 45 may control to turn off the switch S1 and the switch S2 by, for example, sending control signals.
The voltage detection unit 45 may be implemented by a voltage monitoring circuit 451 as shown in fig. 8B, for example. The switch S1 and the switch S2 may be implemented as a small ultra low on-resistance load switch U1 with controlled turn-on functionality in fig. 9.
Referring to fig. 7C, the head mounted display device 4C may further include: a control unit 46. The control unit 46 is connected to the voltage detection unit 45 for instructing the voltage detection unit 45 to control the switch S1 and the switch S2 to turn off.
The control unit 46 may be implemented, for example, as an Application Processor (AP) in the head mounted display device 4C. The application processor may receive user input through a user input module (e.g., a touch screen, buttons/keys, etc.) of the head-mounted display device 4C, and generate a control command according to the user input, and instruct the voltage detection unit 45 to control the switches S1 and S2 to be turned off.
Fig. 8A is a circuit schematic diagram illustrating a voltage detection unit 45 according to an exemplary embodiment.
As shown in fig. 8A, the voltage detection unit 45 includes a voltage monitor circuit (voltage monitor)451 for monitoring the input voltage V1 to be monitored. The monitored threshold voltage Vhb is set by resistors R1, R2, and R3, and when the input voltage V1 is lower than the threshold voltage Vhb, the control signal VPH _ SENSE _ OUT is output to control the switches S1 and S2 to be turned off.
The pin ENABLE of the voltage monitoring circuit 451 is used for receiving an ENABLE signal VPH _ SENSE _ EN, the pin GND is a ground pin, the pin SENSE is used for sensing the magnitude of the input voltage V1, the pin SENSE _ OUT is used for outputting a control signal VPH _ SENSE _ OUT, the pin CT is used for providing a capacitance-adjustable delay signal, and the pin VCC is used for receiving an operating voltage VCC.
The internal circuit of the voltage monitoring circuit 451 is shown in fig. 8B.
When the voltage of the input voltage pin SENSE exceeds a threshold and pin ENABLE is high, the output pin SENSE _ OUT will go high after a period of capacitance adjustable delay time. When the voltage of pin SENSE falls below the threshold Vhb or pin ENABLE is low, the output pin SENSE _ OUT will go low.
Fig. 9 is a circuit schematic diagram illustrating one type of switch S1 according to an example embodiment.
As shown in fig. 9, switch S1 includes a small ultra-low on-resistance load switch U1 with controlled turn-on functionality. The load switch U1 has an input voltage pin VIN and an output voltage pin VOUT, respectively, the switching of the switch pin ON being controlled by the control signal VPH _ SENSE _ OUT described above.
The input terminal voltage pin VIN receives the voltage V1 output from the battery 211, and supplies the output voltage supplied from the output pin VOUT to the power drive unit 23. Since the on-resistance of the load switch U1 is very small, when the load switch U1 is turned on, it can be said that the voltage output by the pin VOUT can be approximately equal to the input voltage V1 provided by the battery 211.
The load switch U1 provides reverse current protection. When the ON input of the switch pin is OFF (e.g., low), the device will prevent current from flowing to the switch input terminal VIN, i.e., from flowing from the power driving unit 23 to the power supply terminal.
Fig. 10 is a circuit schematic diagram illustrating one type of switch S2 according to an exemplary embodiment.
As shown in fig. 10, switch S2 includes a small ultra-low on-resistance load switch U1 with controlled turn-on functionality. The load switch U1 has an input voltage pin VIN and an output voltage pin VOUT, respectively, the switching of the switch pin ON being controlled by the control signal VPH _ SENSE _ OUT described above.
The input terminal voltage pin VIN receives the voltage V2 output by the power management unit 212, and supplies the output voltage supplied from the output pin VOUT to the power driving unit 23. Since the on-resistance of the load switch U1 is very small, when the load switch U1 is turned on, it can be considered that the voltage output by the pin VOUT can be approximately equal to the input voltage V2 provided by the power management unit 212.
The load switch U1 provides reverse current protection. When the ON input of the switch pin is OFF (e.g., low), the device will prevent current from flowing to the switch input terminal VIN, i.e., from flowing from the power driving unit 23 to the power supply terminal.
Fig. 11 shows a block diagram of a head mounted display device in yet another embodiment of the disclosure.
Referring to fig. 11, the head mounted display device 5 includes: power supply circuit 51A, capacitor 52A, power drive unit 53, and DMD 54.
The power driving unit 53 is connected to the DMD54, and is configured to provide the driving voltage Vd to the DMD 54. The driving voltage Vd may include, for example, the voltages VBIAS, VRST and VOFS shown in fig. 1, but the disclosure is not limited thereto, and may be determined according to actual requirements in specific applications. The DMD54 operates based on the driving of the driving voltage.
The power supply circuit 51A is connected to the power supply driving unit 53, and is configured to provide the input voltage V to the power supply driving unit 53.
One end of the capacitor 52A is connected between the power supply circuit 51A and the power supply driving unit 53, and the other end is grounded.
The capacitor 52A can store a sufficient amount of power during the supply of the input voltage to the power driving unit 53 by the power supply circuit 51A. When the power supply circuit 51A is abnormally powered, the power stored in the capacitor 52A can maintain the input voltage in the power driving unit 53 for a period of time, so as to prevent the power driving unit 53 from being rapidly powered down, thereby avoiding damage to the DMD 54. The case in which the power supply circuit 51A is abnormally supplied may include, for example: the power source (e.g., battery) in the power supply circuit 51A is unplugged, or the line in the power supply circuit 51A is suddenly cut off, etc.
Fig. 12 shows a block diagram of a head mounted display device in an embodiment of the present disclosure.
Unlike the head-mounted display device 5 shown in fig. 11, the head-mounted display device 6 further includes, as shown in fig. 12: a power supply circuit 51B and a capacitor 52B. That is, in the embodiment shown in fig. 12, the power driving unit 53 needs two power supply circuits to provide different input voltages for it.
The power supply circuit 51B is connected to the power supply driving unit 53, one end of the capacitor 52B is connected between the power supply circuit 51B and the power supply driving unit 53, and the other end is grounded.
Likewise, the capacitor 52B can store a sufficient amount of power during the supply of the input voltage from the power supply circuit 51B to the power driving unit 53. When the power supply circuit 51B is abnormally powered, the power stored in the capacitor 52B can maintain the input voltage in the power driving unit 53 for a period of time, so as to prevent the power driving unit 53 from being rapidly powered down, thereby avoiding damage to the DMD 54.
Fig. 13 shows a block diagram of a head mounted display device in yet another embodiment of the disclosure.
Referring to fig. 13, unlike the head mounted display device 6 shown in fig. 12, the power supply circuit 51A in the head mounted display device 7 includes: a battery 511; the power supply circuit 51B includes: a battery 511 and a power management unit 512.
The battery 511 is connected to the power drive unit 53, and supplies the input voltage V1 thereto.
The power management unit 512 is connected between the battery 511 and the power driving unit 53, receives the voltage V1 output from the battery 511, converts the voltage V1 into a voltage V2, and outputs the converted voltage. The voltage V2 is supplied to the power supply driving unit 53 as another input voltage of the power supply driving unit 53.
The power management unit 512 may include a voltage conversion circuit for converting the voltage output from the battery 511. The voltage conversion circuit may include, for example, a BUCK step-down circuit or a charge pump (charge pump) circuit.
The disclosed implementation also provides a DLP projection system. The DLP projection system may be implemented, for example, as a chip packaged with a plurality of devices (such as the power driving unit, the DMD, and the control module of the DMD), and provides an external interface to receive an input signal provided by an external circuit/system or output a signal to the outside.
Fig. 14 shows a block diagram of a DLP projection system in an embodiment of the present disclosure.
Referring to fig. 14, the DLP projection system 10 includes: interface 101A, protection circuit 102A, power driving unit 103, and DMD 104.
In the DLP projection system provided by the embodiment of the present disclosure, the light emitted from the light source reaches the DMD104 through the optical system. The light is emitted by the DMD104 to form display content, which is projected onto a screen for display through a projection lens.
The projection principles of DLP technology are well known to those skilled in the art and will not be described in detail herein to avoid obscuring the present invention.
As shown in fig. 14, the power driving unit 103 is connected to the DMD104 for providing the driving voltage Vd to the DMD 104. The driving voltage Vd may include, for example, the voltages VBIAS, VRST and VOFS shown in fig. 1, but the disclosure is not limited thereto, and may be determined according to actual requirements in specific applications. The DMD104 operates based on the driving of the driving voltage.
The power supply driving unit 103 is connected to the interface 101A via the protection circuit 102A, and receives an input voltage V supplied from an external power supply circuit a1 via the interface 101A.
In order to avoid the external power supply circuit a1 from generating an abnormality to rapidly power down the power supply driving unit 103, the protection circuit 102A may prevent current from flowing from the power supply driving unit 103 to the external power supply circuit a1, i.e., prevent the reverse current from flowing, when the external power supply circuit a1 generates an abnormality. The case where the external power supply circuit a1 is abnormally powered may include, for example: the power supply (e.g., battery) in the power supply circuit a1 is unplugged, or the wiring in the power supply circuit a1 is suddenly cut off, etc.
As mentioned above, when the power supply circuit supplies power abnormally, the power driving unit may generate reverse current, which causes the input voltage of the power driving unit to power down quickly, so that the driving voltage output by the power driving unit cannot be reset normally, thereby damaging the DMD.
In the embodiment of the present disclosure, the protection circuit 102A may prevent the reverse current from flowing, so that the input voltage of the power driving unit 103 may be slowly decreased and maintained for a period of time. During this time, the driving voltage Vd output by the power driving unit 103 can be reset normally, ensuring that the DMD104 is not damaged.
Fig. 15A to 15C respectively show block diagrams of DLP projection systems provided according to different exemplary embodiments.
Referring to fig. 15A, in the DLP projection system 10A, the protection circuit 102A may be implemented as a diode D. The diode D has a positive pole (+) connected to the external power supply system a and a negative pole (-) connected to the power supply driving unit 103. Due to the nature of the diode device, current is only allowed to flow from its positive pole to its negative pole. When the external power supply circuit a1 is abnormal, the current of the power driving unit 103 can be prevented from flowing to the external power supply circuit a1, and the input voltage of the power driving unit 103 is prevented from being quickly exhausted, so that the power driving unit 103 is slowly powered off to protect the DMD.
Referring to fig. 15B, in the DLP projection system 10B, there is further included: an interface 101C; the protection circuit 102A may be implemented as a load switch S. The load switch S is connected to the interface 101C, and receives an externally input off signal through the interface 101C. When the load switch S receives the off signal input from the outside, an off operation is performed.
As shown in fig. 15B, for example, the voltage output from the external power supply circuit a1 may be detected by an external voltage detection unit B1, and when the voltage drops to a preset voltage threshold, the voltage detection unit B1 inputs the turn-off signal to the load switch S through the interface 101C, so that the load switch S is turned off. When the load switch S is turned off, the reverse flow of current in the power driving unit 103 can be prevented, so as to ensure that the input voltage of the power driving unit is not rapidly powered down, thereby achieving the purpose of protecting the DMD104 from being damaged.
The switch S may be implemented by a small ultra-low on-resistance load switch U1 with controlled turn-on functionality as in fig. 9.
Referring to fig. 15C, in the DLP projection system 10C, the protection circuit 102A may be implemented as a load switch S. Further, the DLP projection system 10B further includes: a voltage detection unit 105.
The voltage detection unit 105 is connected between the interface 101A and the switch S. In the process of the external power supply circuit a1 providing the input voltage to the power driving unit 103, the voltage detecting unit 105 detects whether the voltage V output by the external power supply circuit a1 is lower than the preset voltage threshold Vh. When the voltage V is lower than the voltage threshold Vh, the control switch S is turned off, so as to prevent the reverse flow of current in the power driving unit 103, ensure that the input voltage thereof is not rapidly powered down, and further protect the DMD104 from being damaged.
The voltage detection unit 105 may control the off switch S by, for example, sending a control signal.
The voltage detection unit 105 may be implemented by a voltage monitoring circuit 451 as shown in fig. 8B, for example. The switch S may be implemented as a small ultra low on-resistance load switch U1 with controlled turn-on functionality in fig. 9.
FIG. 16 shows a block diagram of yet another DLP projection system in an embodiment of the present disclosure.
Unlike the DLP projection system 10 shown in fig. 14, the DLP projection system 20 further includes, as shown in fig. 16: an interface 101B and a protection circuit 102B. That is, in the embodiment shown in fig. 16, the power driving unit 103 needs two power supply circuits to provide different input voltages for it.
The power driving unit 103 is connected to the protection circuit 102B through the interface 101B, and provides an input voltage V2 to the power driving unit 103. The external power supply circuit a2 supplies the input voltage V2 to the power driving unit 103 through the interface 101B.
When the external power supply circuit a2 is abnormally supplied, the protection circuit 102B is used to prevent current from flowing from the power supply drive unit 103 to the external power supply circuit a 2. The case where the external power supply circuit a2 is abnormally powered may include, for example: the power supply (e.g., battery) in the power supply circuit a2 is unplugged, or the wiring in the power supply circuit a2 is suddenly cut off, etc.
Fig. 17A to 17E respectively show block diagrams of DLP projection systems provided according to different exemplary embodiments.
Referring to FIG. 17A, in the DLP projection system 20A, the protection circuit 102A and the protection circuit 102B may be implemented as a diode D1 and a diode D2, respectively. The diode D1 has its anode (+) connected to the interface 101A and its cathode (-) connected to the power driving unit 103. The diode D2 has its anode (+) connected to the interface 101B and its cathode (-) connected to the power driving unit 103.
Due to the nature of the diode device, current is only allowed to flow from its positive pole to its negative pole. When the external power supply circuit a1 and/or the power supply system a2 supplies power abnormally, the current of the power driving unit 103 can be prevented from flowing to the external power supply circuit a1 and/or the power supply system a2, and the input voltage of the power driving unit 103 is prevented from being quickly exhausted, so that the purposes of slowly powering down the power driving unit 103 and protecting the DMD104 are achieved.
Referring to fig. 17B, the DLP projection system 20B further includes: interface 101C1 and interface 101C 2. The protection circuit 102A and the protection circuit 102B may be implemented as a load switch S1 and a load switch S2, respectively.
The switch S1 is connected to the interface 101C1, and receives a first off signal input from the outside through the interface 101C 1. When the first turn-off signal is received, a turn-off operation is performed.
The switch S2 is connected to the interface 101C2, and receives a second off signal input from outside through 101C 2. And when the second turn-off signal is received, performing turn-off operation.
As shown in fig. 17B, for example, the voltage output by the external power supply circuit a1 may be detected by the external voltage detection unit B1, and when the voltage drops to a preset voltage threshold, the voltage detection unit B1 inputs the first turn-off signal to the load switch S1 through the interface 101C1, so that the load switch S1 is turned off. When the load switch S1 is turned off, the reverse flow of current in the power driving unit 103 can be prevented, so as to ensure that the input voltage of the power driving unit is not rapidly powered down, thereby achieving the purpose of protecting the DMD104 from being damaged.
For another example, the voltage output by the external power supply circuit a2 may be detected by the external voltage detection unit B2, and when the voltage drops to a preset voltage threshold, the voltage detection unit B2 inputs the second turn-off signal to the load switch S2 through the interface 101C2, so that the load switch S2 is turned off. When the load switch S2 is turned off, the reverse flow of current in the power driving unit 103 can be prevented, so as to ensure that the input voltage of the power driving unit is not rapidly powered down, thereby achieving the purpose of protecting the DMD104 from being damaged.
Among other things, switch S1 and switch S2 may be implemented as a small ultra-low on-resistance load switch U1 with controlled turn-on functionality in fig. 9.
Referring to fig. 17C, in the DLP projection system 20C, the protection circuit 102A and the protection circuit 102B may be implemented as a load switch S1 and a load switch S2, respectively.
Further, the DLP projection system 20C further includes: a voltage detection unit 105A and a voltage detection unit 105B.
The voltage detection unit 105A is connected between the interface 101A and the switch S1. In the process that the external power supply circuit a1 provides the input voltage to the power driving unit 103, the voltage detection unit 105A detects whether the voltage V1 output by the external power supply circuit a1 is lower than the preset voltage threshold Vh 1. When the voltage V1 is lower than the voltage threshold Vh1, the control switch S1 is turned off, so as to prevent the reverse flow of current in the power driving unit 103, ensure that the input voltage thereof is not rapidly powered down, and further protect the DMD104 from being damaged.
The voltage detection unit 105B is connected between the interface 101B and the switch S2. In the process that the external power supply circuit a2 provides the input voltage to the power driving unit 103, the voltage detection unit 105B detects whether the voltage V2 output by the power supply circuit a2 is lower than the preset voltage threshold Vh 2. When the voltage V2 is lower than the voltage threshold Vh2, the control switch S2 is turned off, so as to prevent the reverse flow of current in the power driving unit 103, ensure that the input voltage thereof is not rapidly powered down, and further protect the DMD104 from being damaged.
The voltage detection unit 105A and the voltage detection unit 105B may control to turn off the switch S1 and the switch S2 by sending control signals, for example.
Among them, the voltage detection unit 105A and the voltage detection unit 105B may be implemented by, for example, a voltage monitoring circuit 451 as shown in fig. 8B. The switch S1 and the switch S2 may be implemented as a small ultra low on-resistance load switch U1 with controlled turn-on functionality in fig. 9.
Referring to fig. 17D, in the DLP projection system 20D, the protection circuit 102A and the protection circuit 102B may be implemented as a load switch S1 and a load switch S2, respectively.
Further, the DLP projection system 20D further includes: a voltage detection unit 105.
The voltage detection unit 105 is connected to the interface 101A, the switch S1, and the switch S2, respectively. In the process that the battery a11 in the external power supply circuit a1 supplies the input voltage to the power driving unit 103, the voltage detection unit 105 detects whether the voltage V1 output by the battery a11 is lower than a preset voltage threshold Vh 1. When the voltage V1 is lower than the voltage threshold Vh1, the switch S1 and the switch S2 are respectively controlled to be turned off, so that the reverse flow of current in the power driving unit 103 is prevented, the input voltage of the power driving unit is ensured not to be rapidly powered down, and the DMD104 is protected from being damaged.
As shown in fig. 17D, the external power supply circuit a2 includes: a battery a11 and a power management unit a12, the power management unit a12 is used for converting the voltage V1 output by the battery a11 and outputting the input voltage V2 of the power driving unit 103. That is, the input voltage V2 is converted based on the input voltage V1.
The voltage detection unit 105 may control to turn off the switch S1 and the switch S2 by, for example, sending control signals.
The voltage detection unit 105 may be implemented by a voltage monitoring circuit 451 as shown in fig. 8B, for example. The switch S1 and the switch S2 may be implemented as a small ultra low on-resistance load switch U1 with controlled turn-on functionality in fig. 9.
Referring to fig. 17E, the DLP projection system 20E further includes: the interface 101D is connected to the voltage detection unit 105. The voltage detection unit may also receive an external control signal through the interface 101D and transmit a turn-off signal to the switch S1 and the switch S2 based on the control signal.
FIG. 18 shows a block diagram of yet another DLP projection system in an embodiment of the present disclosure.
Referring to fig. 18, the DLP projection system 30 includes: interface 301A, capacitor 302A, power driver 303, and DMD 304.
The power driving unit 303 is connected to the DMD304 and is configured to provide a driving voltage Vd to the DMD 304. The driving voltage Vd may include, for example, the voltages VBIAS, VRST and VOFS shown in fig. 1, but the disclosure is not limited thereto, and may be determined according to actual requirements in specific applications. The DMD304 operates based on the driving of the driving voltage.
The power driving unit 303 is connected to an external power supply circuit a1 through the interface 301A, thereby receiving the input voltage V supplied from the power supply circuit a1 through the interface 301A.
One end of the capacitor 302A is connected between the interface 301A and the power driving unit 303, and the other end is grounded.
The capacitor 302A can store enough power during the process that the external power supply circuit a1 provides the input voltage to the power driving unit 303. When the external power supply circuit a1 is out of order, the power stored in the capacitor 302A can maintain the input voltage in the power driving unit 303 for a period of time, preventing the power driving unit 303 from being powered down quickly, thereby avoiding damage to the DMD 304. The case in which the power supply circuit a1 is abnormally supplied may include, for example: the power supply (e.g., battery) in the power supply circuit a1 is unplugged, or the wiring in the power supply circuit a1 is suddenly cut off, etc.
FIG. 19 illustrates a block diagram of yet another DLP projection system in an embodiment of the present disclosure.
Unlike the DLP projection system 30 shown in fig. 18, the DLP projection system 40 further includes, as shown in fig. 19: interface 301B and capacitor 302B.
The power driving unit 53 is connected to the external power supply circuit a1 and the external power supply circuit a2 through the interface 301A and the interface 301B, respectively, that is, in the embodiment shown in fig. 19, the power driving unit 303 needs two power supply circuits to provide different input voltages for it.
One end of the capacitor 302B is connected between the interface 301B and the power driving unit 303, and the other end is grounded.
Similarly, the capacitor 302B can store enough power during the process of the external power supply circuit a2 supplying the input voltage to the power driving unit 303. When the power supply circuit a2 supplies power abnormally, the power stored in the capacitor 302B can maintain the input voltage in the power driving unit 303 for a period of time, preventing the power driving unit 303 from being powered down quickly, thereby avoiding damage to the DMD 304.
It should be noted that although in the above detailed description several modules or units of the device for action execution are mentioned, such a division is not mandatory. Indeed, the features and functionality of two or more modules or units described above may be embodied in one module or unit, according to embodiments of the present disclosure. Conversely, the features and functions of one module or unit described above may be further divided into embodiments by a plurality of modules or units.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

Claims (23)

1. A head-mounted display device, comprising:
a digital micromirror unit;
the power supply driving unit is connected with the digital micromirror unit and used for providing driving voltage for the digital micromirror unit;
a first protection circuit; and
the first power supply circuit is connected with the power supply driving unit through the first protection circuit and used for providing a first input voltage for the power supply driving unit;
the first protection circuit is used for preventing current from flowing from the power supply driving unit to the first power supply circuit when the first power supply circuit is abnormally powered.
2. The head-mounted display device of claim 1, further comprising: a second power supply circuit and a second protection circuit;
the second power supply circuit is connected with the power supply driving unit through the second protection circuit and used for providing a second input voltage for the power supply driving unit;
the second protection circuit is used for preventing current from flowing from the power supply driving unit to the second power supply circuit when the second power supply circuit is abnormally powered.
3. The head-mounted display device of claim 2, wherein the first power supply circuit comprises: a battery; the battery is connected with the power supply driving unit through the first protection circuit and provides the first input voltage;
the second power supply circuit includes: the battery and power management unit, wherein the power management unit is connected between the battery and the second protection circuit, receives the first input voltage output by the battery, converts the first input voltage into the second input voltage, and is connected with the power driving unit through the second protection circuit to provide the second input voltage.
4. The head-mounted display device of claim 3, further comprising: a voltage detection unit; the first protection circuit includes: a first switch; the second protection circuit includes: a second switch;
the voltage detection unit is respectively connected with the battery, the first switch and the second switch, and is used for detecting whether the first input voltage is lower than a voltage threshold value, and respectively controlling the first switch and the second switch to be switched off when the first input voltage is lower than the voltage threshold value.
5. The head-mounted display device of claim 4, further comprising: and the control unit is connected with the voltage detection unit and used for indicating the voltage detection unit to control the first switch and the second switch to be switched off according to the input of a user.
6. The head-mounted display device of claim 2, further comprising: a first voltage detection unit and a second voltage detection unit; the first protection circuit includes: a first switch; the second protection circuit includes: a second switch;
the first voltage detection unit is connected between the first power supply circuit and the first switch, and is used for detecting whether the first input voltage is lower than a first voltage threshold value or not and controlling the first switch to be switched off when the first input voltage is lower than the first voltage threshold value;
the second voltage detection unit is connected between the second power supply circuit and the second switch, and is used for detecting whether the second input voltage is lower than a second voltage threshold value or not, and controlling the second switch to be turned off when the second input voltage is lower than the second voltage threshold value.
7. The head-mounted display device of claim 2, wherein the first protection circuit comprises: a first diode; the second protection circuit includes: a second diode;
the anode of the first diode is connected with the first power supply circuit, and the cathode of the first diode is connected with the power supply driving unit;
and the anode of the second diode is connected with the second power supply circuit, and the cathode of the second diode is connected with the power supply driving unit.
8. The head-mounted display device of claim 1, further comprising: a voltage detection unit; the first protection circuit includes: a switch;
the voltage detection unit is connected between the first power supply circuit and the switch, and is used for detecting whether the first input voltage is lower than a voltage threshold value or not and controlling the switch to be switched off when the first input voltage is lower than the voltage threshold value.
9. A head-mounted display device, comprising:
a digital micromirror unit;
the power supply driving unit is connected with the digital micromirror unit and used for providing driving voltage for the digital micromirror unit;
the first power supply circuit is connected with the power supply driving unit and used for providing a first input voltage for the power supply driving unit; and
one end of the first capacitor is connected between the first power supply circuit and the power supply driving unit, and the other end of the first capacitor is grounded.
10. The head-mounted display device of claim 9, further comprising: a second power supply circuit and a second capacitor;
one end of the second capacitor is connected between the second power supply circuit and the second input voltage interface, and the other end of the second capacitor is grounded.
11. The head-mounted display device of claim 10, wherein the first power supply circuit comprises: a battery; wherein the battery is connected with the power driving unit and provides the first input voltage;
the second power supply circuit includes: the battery and power management unit, wherein the power management unit is connected between the battery and the power driving unit, receives the first input voltage output by the battery, converts the first input voltage into the second input voltage, and provides the second input voltage to the power driving unit.
12. A DLP projection system, comprising:
a digital micromirror unit;
a first interface;
a first protection circuit; and
the power supply driving unit is connected with the digital micromirror unit, is connected with the first interface through the first protection circuit, and is used for providing driving voltage for the digital micromirror unit and receiving first input voltage provided by an external first power supply circuit through the first interface;
the first protection circuit is used for preventing current from flowing from the power supply driving unit to the first power supply circuit when the first power supply circuit is abnormally powered.
13. The DLP projection system according to claim 12, further comprising: a second interface and a second protection circuit;
the power supply drive is connected with the second interface through the second protection circuit and is also used for receiving a second input voltage provided by an external second power supply circuit through the second interface;
the second protection circuit is used for preventing current from flowing from the power supply driving unit to the second power supply circuit when the second power supply circuit is abnormally powered.
14. The DLP projection system according to claim 13, further comprising: a third interface and a fourth interface; the first protection circuit includes: a first switch; the second protection circuit includes: a second switch;
the first switch is connected with the third interface and used for receiving a first turn-off signal input from the outside through the third interface and executing turn-off operation when receiving the first turn-off signal;
the second switch is connected with the fourth interface and used for receiving a second turn-off signal input from the outside through the fourth interface and executing turn-off operation when receiving the second turn-off signal.
15. The DLP projection system according to claim 13, further comprising: a voltage detection unit; the first protection circuit includes: a first switch; the second protection circuit includes: a second switch;
the voltage detection unit is respectively connected with the first interface, the first switch and the second switch, and is used for detecting whether the first input voltage is lower than a voltage threshold value, and sending the first turn-off signal to the first switch and sending the second turn-off signal to the second switch when the first input voltage is lower than the voltage threshold value;
the second input voltage is converted based on the first input voltage.
16. The DLP projection system according to claim 15, further comprising: and the voltage detection unit is also used for receiving an external control signal through the fifth interface, and sending the first turn-off signal to the first switch and sending the second turn-off signal to the second switch based on the control signal.
17. The DLP projection system according to claim 13, further comprising: a first voltage detection unit and a second voltage detection unit; the first protection circuit includes: a first switch; the second protection circuit includes: a second switch;
the first voltage detection unit is connected between the first interface and the first switch, and is used for detecting whether the first input voltage is lower than a first voltage threshold value or not, and sending the first turn-off signal to the first switch when the first input voltage is lower than the first voltage threshold value;
the second voltage detection unit is connected between the second interface and the second switch, and is configured to detect whether the second input voltage is lower than a second voltage threshold, and send the second turn-off signal to the second switch when the second input voltage is lower than the second voltage threshold.
18. The DLP projection system of claim 13, wherein said first protection circuit comprises: a first diode; the second protection circuit includes: a second diode;
the anode of the first diode is connected with the first interface, and the cathode of the first diode is connected with the power supply driving unit;
and the anode of the second diode is connected with the second interface, and the cathode of the second diode is connected with the power supply driving unit.
19. The DLP projection system according to claim 12, further comprising: a sixth interface; the first protection circuit includes: a switch;
the switch is connected with the sixth interface and used for receiving an externally input turn-off signal through the sixth interface and executing turn-off operation when receiving the turn-off signal.
20. The DLP projection system according to claim 12, further comprising: a voltage detection unit; the first protection circuit includes: a switch;
the voltage detection unit is respectively connected with the first interface and the switch, and is configured to detect whether the first input voltage is lower than a voltage threshold, and send the turn-off signal to the switch when the first input voltage is lower than the voltage threshold.
21. The DLP projection system of claim 12, wherein said first protection circuit comprises: a diode; the anode of the diode is connected with the first interface, and the cathode of the diode is connected with the power supply driving unit.
22. A DLP projection system, comprising:
a digital micromirror unit;
a first interface;
the power supply driving unit is respectively connected with the digital micromirror unit and the first interface, and is used for providing driving voltage for the digital micromirror unit and receiving first input voltage provided by an external first power supply circuit through the first interface; and
one end of the first capacitor is connected between the first interface and the power supply driving unit, and the other end of the first capacitor is grounded.
23. The DLP projection system according to claim 22, further comprising: a second interface and a second capacitor;
the power driving unit is connected with the second interface and receives a second input voltage provided by an external second power supply circuit through the second interface;
one end of the second capacitor is connected between the second interface and the power supply driving unit, and the other end of the second capacitor is grounded.
CN202010096962.7A 2020-02-17 2020-02-17 Head-mounted display device and DLP projection system Pending CN111158152A (en)

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Application publication date: 20200515