WO2022062966A1 - 投影系统 - Google Patents

投影系统 Download PDF

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Publication number
WO2022062966A1
WO2022062966A1 PCT/CN2021/118233 CN2021118233W WO2022062966A1 WO 2022062966 A1 WO2022062966 A1 WO 2022062966A1 CN 2021118233 W CN2021118233 W CN 2021118233W WO 2022062966 A1 WO2022062966 A1 WO 2022062966A1
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WO
WIPO (PCT)
Prior art keywords
board
light valve
projection system
laser
driving
Prior art date
Application number
PCT/CN2021/118233
Other languages
English (en)
French (fr)
Inventor
陈许
朱亚文
李晓平
Original Assignee
青岛海信激光显示股份有限公司
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 of WO2022062966A1 publication Critical patent/WO2022062966A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • H04N9/3161—Modulator illumination systems using laser light sources

Definitions

  • the present disclosure relates to the field of projection display, and in particular, to a projection system.
  • a projection system may include a projection screen and a host, and the projection screen is fixed on a wall.
  • the main unit is used to project images onto the projection screen.
  • An embodiment of the present disclosure provides a projection system, and the projection system includes:
  • the housing has a accommodating space
  • the board, the power board and the display board are all located on the bottom plate, and the main board is located on the side board;
  • the light valve driving board and the lens assembly are arranged along a first direction, and the first direction is parallel to the projection screen; the laser driving board is located on a side of the light valve driving board away from the projection screen;
  • the power board is located on the side of the lens assembly away from the light valve driving board, or on the side of the laser driver board away from the lens assembly;
  • the display panel and the mainboard are both located on the side of the lens assembly close to the projection screen, and the display panel and the mainboard are arranged along the first direction;
  • the board surface of the bottom plate is perpendicular to the board surface of the side board; the board surface of the light valve driving board and the laser driving board are both perpendicular to the board surface of the bottom board, and both are perpendicular to the board surface of the bottom board.
  • the board surface of the side board; the board surface of the power board is parallel to the board surface of the bottom plate; the board surface of the display board and the board surface of the main board are both parallel to the board surface of the side board.
  • FIG. 1 is a schematic partial structure diagram of a projection system provided by an embodiment of the present disclosure
  • FIG. 2 is a schematic partial structure diagram of another projection system provided by an embodiment of the present disclosure.
  • FIG. 3 is a schematic partial structure diagram of a projection system provided by an embodiment of the present disclosure.
  • FIG. 4 is a schematic partial structure diagram of another projection system provided by an embodiment of the present disclosure.
  • FIG. 5 is a schematic partial structure diagram of another projection system provided by an embodiment of the present disclosure.
  • FIG. 6 is a schematic partial structure diagram of still another projection system provided by an embodiment of the present disclosure.
  • FIG. 7 is a schematic diagram of connection of various circuit boards provided by an embodiment of the present disclosure.
  • FIG. 8 is a schematic diagram of the connection between a laser driving assembly and a laser provided by an embodiment of the present disclosure
  • FIG. 9 is a schematic diagram of an outer sleeve of a magnetic ring surrounding a shielding layer of a laser driving line provided by an embodiment of the present disclosure
  • FIG. 10 is a schematic diagram of connecting a common mode inductor to a laser driving component and a laser according to an embodiment of the present disclosure
  • FIG. 11 is a schematic diagram of connecting another common mode inductor, a laser driving component and a laser provided by an embodiment of the present disclosure
  • FIG. 12 is a schematic diagram of a result obtained by performing a low-frequency radiation disturbance field strength test on a projection system according to an embodiment of the present disclosure
  • FIG. 13 is an eye diagram of a light valve receiving an LVDS transmitted by a light valve driving component according to an embodiment of the present disclosure
  • FIG. 14 is a schematic diagram of a connection of two crimping resistors provided by an embodiment of the present disclosure
  • FIG. 15 is a rear view of a projection system provided by an embodiment of the present disclosure.
  • FIG. 16 is a front view of a projection system provided by an embodiment of the present disclosure.
  • 17 is a schematic diagram of abstracting a laser drive line as a monopole antenna provided by an embodiment of the present disclosure
  • FIG. 18 is a schematic diagram of abstracting a current loop of a differential mode current into a loop antenna provided by an embodiment of the present disclosure
  • FIG. 19 is a partial structural schematic diagram of a curtain driving assembly provided by an embodiment of the present disclosure.
  • FIG. 20 is a schematic partial structure diagram of another screen driving assembly provided by an embodiment of the present disclosure.
  • 21 is a schematic partial structure diagram of another projection system provided by an embodiment of the present disclosure.
  • FIG. 22 is a schematic partial structure diagram of another projection system provided by an embodiment of the present disclosure.
  • FIG. 23 is a schematic structural diagram of a projection system provided by the related art.
  • FIG. 1 is a schematic structural diagram of a projection system provided by an embodiment of the present disclosure.
  • the projection system includes a housing 00 with an accommodating space therein, and one side of the housing 00 has an opening 001 communicating with the accommodating space.
  • the projection system also includes a projection screen 10 .
  • the projection screen 10 can be lifted out of the opening 001 to the outside of the casing 00 .
  • the projection screen 10 can be retracted from the opening 001 into the accommodating space of the housing 00 .
  • the projection system further includes a bottom plate 20 , a side plate 30 , a lens assembly 40 , a light valve driving board 50 , a laser driving board 60 , a power board 70 , a display board 80 and a main board 90 located in the accommodating space .
  • the material of the bottom plate may be a metallic material, such as iron.
  • the light valve driving board 50 and the lens assembly 40 are arranged along a first direction V, and the first direction V is parallel to the projection screen 10 .
  • the laser driving board 60 is located on the side of the light valve driving board 50 away from the projection screen 10 .
  • the optical axis of the lens assembly 40 may be located in a middle section of the accommodating space, and the middle section is perpendicular to the projection screen 10 .
  • the power board 70 is located on the side of the lens assembly 40 away from the light valve driving board 50, or, referring to FIG. 6, the power board 70 is located on the side of the laser driving board 60 away from the lens assembly 40.
  • both the display panel 80 and the main board 90 are located on one side of the lens assembly 40 close to the projection screen 10 , and the display panel 80 and the main board 90 are arranged along the first direction V. As shown in FIG. 6 , both the display panel 80 and the main board 90 are located on one side of the lens assembly 40 close to the projection screen 10 , and the display panel 80 and the main board 90 are arranged along the first direction V. As shown in FIG. 6 , both the display panel 80 and the main board 90 are located on one side of the lens assembly 40 close to the projection screen 10 , and the display panel 80 and the main board 90 are arranged along the first direction V. As shown in FIG.
  • the board surface of the bottom plate 20 is perpendicular to the board surface of the side board 30 .
  • the board surface of the light valve driving board 50 and the board surface of the laser driving board 60 are both perpendicular to the board surface of the bottom plate 20 and the board surface of the side board 30 .
  • the board surface of the power board 70 is parallel to the board surface of the bottom plate 20 .
  • the panel surface of the display panel 80 and the panel surface of the main board 90 are both parallel to the panel surface of the side panel 30 .
  • the light valve driving board, the laser driving board, the power board, the display board and the main board in the projection system are scattered in the housing of the projection system, compared with In the related art, a plurality of circuit boards are stacked and arranged in the casing, and this arrangement effectively reduces the thickness of the projection system.
  • the power board 70 is electrically connected to the laser driving board 60 , the display board 80 and the main board 90 respectively, and the power board 70 is used to provide power signals to the laser driving board 60 , the display board 80 and the main board 90 respectively.
  • the power supply board 70 is also used for providing a laser driving signal to the laser driving board 60, and the laser driving board 60 is used for emitting a laser beam under the driving of the power supply signal and the laser driving signal.
  • the power board 70 can also provide power signals for other functional modules in the projection system, such as eye protection modules, fans and wireless fidelity (wireless fidelity, WIFI) modules, etc., to ensure power supply in the projection system.
  • Each part normally provides power signals.
  • the mainboard 90 is also electrically connected to the display panel 80 , and the mainboard 90 is used for sending image signals to the display panel 80 under the driving of a power signal.
  • the mainboard 90 has a system on chip (SoC), which can decode data in different data formats into a normalized format, and transmit the data in the normalized format through, for example, a connector. to display panel 80.
  • SoC system on chip
  • the display panel 80 is also electrically connected to the light valve driving board 50 , and the display panel 80 is used for generating light valve control signals according to the image signals under the driving of the power signal, and sending the light valve control signals to the light valve driving board 50 .
  • the light valve in the light valve driving board 50 is used to turn over under the driving of the light valve driving signal, and transmit the laser beam to the lens assembly 40 .
  • the display panel 80 may have an algorithm processing module, a field programmable gate array (FPGA) and a digital light processing (DLP) chip.
  • the algorithm processing module FPGA is used to process the input image signal, such as motion estimation and motion compensation (motion estimation and motion compensation, MEMC) frequency doubling processing, or image correction and other image enhancement functions.
  • the DLP chip is connected with the algorithm processing module FPGA, and is used for receiving the processed image processing signal data as the image data to be displayed. It should be noted that the algorithm processing module FPGA usually exists as an enhanced function module. In some low-cost solutions, the module part may not be provided.
  • the DLP chip is connected to the main board 90 , and the DLP chip is used to receive the image output by the main board 90 . Signal.
  • the laser part of the projection system needs to match the working sequence of the DLP chip and the light valve in the light valve driver board.
  • the DLP chip outputs an image enable signal to the laser drive component in the power board, which can also be called a primary color light enable signal, usually expressed as X_EN, where X is an abbreviation for different primary color lights, and also outputs a brightness adjustment signal at the same time , referred to as pulse width modulation (pulse width modulation, PWM) signal.
  • the laser driving component provides a laser driving signal to the laser in the laser driving board in response to the image enabling signal and the brightness adjusting signal, and the laser driving board 60 emits a laser beam under the driving of the power signal and the laser driving signal.
  • the laser part needs to output the primary color light beam of the corresponding color synchronously. That is, the DLP chip outputs a primary color light enable signal to inform the laser to enable the lighting of a certain color laser, and outputs a PWM signal to inform the laser driver board with what brightness to light up the laser.
  • the projection system may further include a first power supply line 91 , a second power supply line 92 , a laser driving line 93 , a differential signal line 94 and an image signal line 95 located in the accommodating space.
  • the power supply board 70 and the laser driving board 60 are electrically connected through the laser driving lines 93 .
  • the laser driving component 71 in the power board 70 can be connected with the laser 61 in the laser driving board 60 through the laser driving line 93 .
  • the laser driving component 71 in the power board 70 provides power signals and laser driving signals to the laser 61 in the laser driving board 60 through the laser driving line 93 .
  • the power board 70 is electrically connected to the main board 90 through a second power line 92 .
  • the main board 90 is electrically connected to the display panel 80 through image signal lines 95 .
  • the power board 70 can provide power signals to the main board 90 through the second power line 92 , and the main board 90 sends image signals to the display panel 80 through the image signal line 95 .
  • the power supply board 70 and the display board 80 are electrically connected through a first power supply line 91 , and the display board 80 and the light valve driving board 50 are electrically connected through a differential signal line 94 .
  • the power board 70 can provide power signals to the display board 80 through the first power line 91 , and the display board 80 sends light valve control signals to the light valve driving board 50 through the differential signal line 94 .
  • the first power line 91 , the second power line 92 , the laser driving line 93 , the differential signal line 94 and the image signal line 95 are all in contact with the base plate 20 , and the base plate 20 is grounded.
  • the first power line 91, the second power line 92, the laser driving line 93, the differential signal line 94 and the image signal line 95 also transmit a part of the common mode signal in the process of transmitting the current signal,
  • the common mode signal is radiated to the outside of the casing 00 through the plurality of connecting wires.
  • the electromagnetic signals transmitted through the first power supply line 91 , the second power supply line 92 , the laser driving line 93 , the differential signal line 94 and the image signal line 95 can be led to the ground to avoid more electromagnetic signals Radiation to the outside of the casing affects the user.
  • the projection system may also include a shielding layer 96 .
  • the shielding layer 96 wraps the outer side of the laser driving line 93, and the shielding layer 96 is grounded.
  • both ends of the shielding layer 96 may be grounded, or one end may be grounded.
  • the material of the shielding layer 96 may be a metal material, for example, the metal material may be red copper or tinned copper.
  • the shielding layer 96 may be a mesh braided layer.
  • the shielding layer 96 is wrapped around the outer side of the laser driving line 93 and the shielding layer 96 is grounded, the common mode signal transmitted by the laser driving line 93 can be conducted to the ground through the shielding layer 96, so as to shield the common mode signal from the projection system. inside, to avoid the situation that the common mode signal transmitted by the laser drive line is more radiated to the outside of the casing, which will affect the user, thereby reducing the impact on the user. At the same time, it is ensured that the common mode interference of the projection system meets the electromagnetic compatibility limit requirements, and that the projection system can pass the electromagnetic interference (electro-magnetic interference, EMI) test, thereby ensuring that the projection system is qualified.
  • electromagnetic interference electromagnetic interference
  • the shielding layer 96 may be connected to the base plate 20 . Since the materials of the shielding layer 96 and the bottom plate 20 are both metal materials, and the bottom plate 20 is grounded. Therefore, the shielding layer 96 is connected to the base plate 20, and the shielding layer 96 can be grounded.
  • the two ends of the shielding layer 96 may be directly connected to the base plate 20 .
  • both ends of the shielding layer 96 may be connected to the bottom plate 20 through metal wires.
  • one end of the shielding layer 96 can be directly connected to the base plate 20, and the other end of the shielding layer 96 can be connected to the base plate 20 through a metal wire.
  • the distance between the power board 70 and the laser driver board 60 is less than or equal to 700 millimeters (mm). The shorter the length of the distance between the power supply board 70 and the laser driving board 60, the shorter the laser driving line 93, the less the common mode signal transmitted through the laser driving line, so the laser driving line 93 radiates to the housing The less common mode signal outside the 00.
  • the projection system further includes a magnetic ring 97 , the magnetic ring 97 is sleeved on the outer side of the shielding layer 96 , and the length of the magnetic ring 97 is less than the length of the shielding layer 96 , that is, the magnetic ring 97 covers only part of the shielding layer 96 .
  • the impedance on the common mode current transmission path can be increased, that is, the impedance of the laser driving line 93 can be increased, thereby effectively suppressing the common mode signal and reducing the laser driving line. the common mode current, thereby reducing the common mode signal radiated to the outside of the housing.
  • the projection system further includes a common mode inductor located in the receiving space.
  • the common mode inductor is connected in series between the power supply board 70 and the laser driving board 60 through the laser driving line 93 .
  • the impedance on the common mode current transmission path can be increased, that is, the impedance of the laser driving line 93 can be increased, thereby effectively suppressing the common mode generated by the laser driving component 71 . signal, reducing the common mode current on the laser driving line, thereby reducing the common mode signal radiated to the outside of the housing.
  • the power board 70 may include a first circuit board 72 , a laser driving component 71 and a first common mode inductor 73 located on the first circuit board 72 .
  • the first common mode inductor 73 is connected in series between the laser driving component 71 in the power supply board 70 and the laser 61 in the laser driving board 60 through the laser driving line 93 .
  • the laser driving board 60 includes a second circuit board 62 , a laser 61 and a second common mode inductor 63 located on the second circuit board 62 .
  • the second common mode inductor 63 is connected in series between the laser driving component 71 in the power supply board 70 and the laser 61 in the laser driving board 60 through the laser driving line 93 .
  • the first circuit board 72 may be provided with a first common mode inductor 73
  • the second circuit board 62 may be provided with a second common mode inductor 63 .
  • the distance between the power supply board 70 and the laser driving board 60 is less than or equal to 700 mm, a shielding layer is wound on the laser driving wire 93, and the shielding layer 96 is sleeved with a magnetic ring 97 or the projection system
  • the far-field low-frequency radiation disturbance field strength test is performed on the projection system through the test equipment.
  • FIG. 12 is a schematic diagram of a result obtained by performing a low-frequency radiation disturbance field strength test on a projection system according to an embodiment of the present disclosure. As shown in FIG.
  • the abscissa in the schematic diagram of the results represents the test frequency of the test equipment, that is, the operating frequency of the antenna in the test equipment, and the unit is megahertz (MHz).
  • the test frequency range is 30MHz ⁇ 1000MHz.
  • the ordinate in the schematic diagram of the results represents the quasi-peak value of the electromagnetic signal, and the unit is decibel (db).
  • the first curve X1 in the schematic diagram of the results is the quasi-peak value curve of the electromagnetic signal radiated by the projection system within the test frequency range of 30MHz to 1000MHz. The stronger the signal, the electromagnetic signal includes the common mode signal described above.
  • the second curve X2 in the schematic diagram of the results is the quasi-peak threshold curve of the electromagnetic signal that meets the civil-grade CISPR22Class B low-frequency radiation disturbance field strength test within the test frequency range of 30MHz to 1000MHz.
  • any quasi-peak value in the first curve X1 is located above the second curve X2, it can be determined that the projection system radiates too many electromagnetic signals, which cannot meet the usage requirements. If the first curve X1 is located below the second curve X2, it can be determined that the electromagnetic signal radiated by the projection system is less, which meets the usage requirements.
  • the first curve X1 is located below the second curve X2, that is, at any test frequency, the quasi-peak value of the electromagnetic signal radiated by the projection system is smaller than the corresponding quasi-peak value of the electromagnetic signal radiated by the projection system. Peak threshold. It can be seen that the projection system has passed the low-frequency radiation field strength disturbance test of civil-grade CISPR22Class B, and the projection system meets the requirements for use.
  • Table 1 shows the debugging parameters of the test equipment, the quasi-peak value of the electromagnetic signal radiated by the projection system, the quasi-peak value of the electromagnetic signal, and the difference between the quasi-peak value threshold and the quasi-peak value in the process of testing the projection system by the test equipment.
  • the debugging parameters may include the test frequency of the test equipment, the test duration, the height of the test equipment from the bottom surface, the polarity and the angle of the antenna in the test equipment. Among them, the polarity is V, which means that the antenna of the test equipment is perpendicular to the projection system.
  • the unit of test duration is ms
  • the unit of bandwidth is kilohertz (kHz), and its unit is centimeter (cm).
  • the distance between the power supply board 70 and the laser drive board 60 is less than or equal to 700mm, the laser drive wire 93 is wound with a shielding layer, and the shielding layer 96 is sleeved with a magnetic ring 97 or the In the scenario where the projection system includes a common mode inductor, the projection system has passed the low-frequency radiation disturbance field strength test, that is, the projection system meets the usage requirements.
  • the distance between the display panel 80 and the light valve driving board 50 can be determined according to the communication rate between the light valve control assembly in the display panel 80 and the light valve in the light valve driving board 50 .
  • the display panel 80 and the light valve driving panel 50 are connected by low-voltage differential signaling (LVDS) lines. Therefore, the light valve control component in the display panel 80 can transmit the light valve control signal to the light valve in the light valve driving board 50 in the LVDS format.
  • the light valve is flipped under the control of the light valve control signal, and the flipped light valve is used to modulate the light beam irradiated on its surface into an image light beam, and transmit the image light beam to the lens assembly 40 .
  • the lens assembly 40 is used for transmitting the image beam to the projection screen 10 to display the image on the projection screen 10 .
  • the communication rate between the light valve control assembly and the light valve is less than or equal to 1.6 gigabits per second (Gbps)
  • the distance between the display panel 80 and the light valve driving board 50 is less than or equal to 254 mm, That is, the length of the LVDS line connected between the display panel 80 and the light valve driving panel 50 is less than or equal to 254 mm. In this way, it can be ensured that the quality of the differential signal received by the light valve in the light valve driving board 50 is good.
  • FIG. 13 is an eye diagram of a light valve receiving an LVDS transmitted by a light valve driving assembly provided by an embodiment of the present disclosure.
  • the abscissa of the eye diagram is time, and the unit is picosecond (ps), and the ordinate is the voltage of the LVDS received by the light valve, and the unit is millivolt (mV).
  • the voltage of the LVDS received by the light valve is between the first threshold and the second threshold, and the difference between the maximum voltage of the LVDS and the first threshold is large, and the minimum voltage of the LVDS is the same as the first threshold.
  • the difference between the two thresholds is also larger.
  • the first threshold is 400mV
  • the second threshold is -400mV.
  • the voltages of the intersection point P1 and the intersection point P2 in the LVDS are both small, indicating that the jitter of the LVDS is small, that is, the quality of the LVDS is good, and the possibility of bit errors in the LVDS is low.
  • the distance between the display panel 80 and the light valve driving board 50 is less than or equal to 254 mm, the quality of the LVDS received by the light valve is better.
  • the power supply voltage of the main board 90 and the display panel 80 is 12 volts (V), and the minimum input voltage thereof is greater than or equal to 11V. If the input voltage of the display panel 80 is less than 11V, the display panel 80 will enter the system reset. Therefore, when laying out the main board 90 and the display board 80 , the distances between the main board 90 , the display board 80 and the power board 70 need to be considered.
  • the current on the wire connecting the display board 80 and the power board 70 or the main board 90 and the power board 70 is I
  • the wire length of the wire is L
  • the crimp resistance at both ends of the wire is Rt.
  • the resistance per unit length of a wire is ⁇ .
  • the resistance per unit length of the wire is 150 ohms/kilometer ( ⁇ /Km)
  • the ambient temperature is 20 degrees Celsius
  • the current I is 2A
  • the crimping resistance Rt is 100 milliohms (m ⁇ ).
  • the length of the wire is less than or equal to 1.5m.
  • the distances between the display board 80 and the power board 70, and the distances between the power board 70 and the main board 90 are all less than or equal to 600 mm.
  • the distance between the main board 90 and the display panel 80 is less than or equal to 700 mm. This distance can ensure the distance between the display board and the power board, the distance between the main board and the display board, and the distance between the main board and the power board while ensuring that the voltage received by the main board 90 and the display board 80 is greater than or equal to 11V.
  • the distance is shorter.
  • the lens assembly 40 may include a first lens subassembly 41 , a second lens subassembly 42 and a reflection subassembly 43 , and the optical axis of the second lens subassembly 42 intersects with the optical axis of the first lens subassembly 41 .
  • the first lens subassembly 41 is used to transmit the laser beam transmitted by the light valve driving board 50 to the reflection subassembly 43 .
  • the reflection sub-assembly 43 is used for reflecting the laser beam to the second lens sub-assembly 42 .
  • the second lens subassembly 42 is used to project the laser beam onto the projection screen 10 .
  • the optical axis of the first lens subassembly in the lens assembly does not intersect with the optical axis of the second lens subassembly.
  • Some optical lenses in the lens assembly are arranged along the optical axis direction of the second lens subassembly, and the rest of the optical lenses are arranged along the optical axis direction of the first lens subassembly. Therefore, the arrangement along the optical axis direction of the second lens subassembly is effectively reduced.
  • the number of optical lenses is reduced, thereby shortening the distance between the light-emitting side of the second lens subassembly and the projection screen, and reducing the projection ratio of the projection system. This arrangement can be suitable for ultra-short-focus projection systems.
  • the projection system may further include an optical transmission assembly 98 located on the light exit side of the laser driving board 60 , and the optical transmission assembly 98 is used for the laser light emitted by the laser 61 in the laser driving board 60 The light beam is transmitted to the light valve driving board 50 .
  • the projection system may further include an engine carrying board and a circuit carrying board located in the accommodating space of the housing 00 . Both the engine carrier board and the circuit carrier board are located on the bottom plate.
  • the optical engine is located on the engine carrier board, and the circuit portion is located on the circuit carrier board.
  • the optical engine may include the above-mentioned laser driving board 60 , optical transmission assembly 98 , light valve driving board 50 and lens assembly 40 .
  • the circuit part may include the above-described display panel 80 and power supply panel 70 .
  • the materials of the engine carrier board and the circuit carrier board may be both metal materials, for example, the metal material may be iron.
  • the strength of the engine carrier board is greater than that of the circuit carrier board. Since the weight of the optical engine is generally greater than that of the circuit portion, the strength of the engine carrier board is greater than that of the circuit carrier board to ensure the stability of the optical engine. At the same time, since the optical engine and the circuit part are arranged on different carrier boards, the strength of the engine carrier board can only be increased without increasing the strength of the circuit carrier board. While being flexible, the manufacturing cost of the projection system is saved.
  • the optical engine and the projection screen are arranged opposite to each other. Since the projection lens of the optical engine is an ultra-short-throw lens, the position of the projection lens and the projection screen must be strictly aligned.
  • the influence of the circuit part on the optical engine can also be effectively avoided, the normal operation of the optical engine can be ensured, and the display effect of the projection system can be ensured.
  • the projection system may further include a plurality of sound box parts 99 . 4, the projection system further includes two sound box parts 99, one sound box part 99 is located on the side of the light valve driving board 50 away from the lens assembly 40, and the other is located on the side of the power board 70 away from the lens assembly 40.
  • the housing 00 may include an oppositely disposed upper housing and a lower housing, and the sound box portion 99 may be located on the lower housing. Alternatively, the sound box portion 99 may be located on the bottom plate 20 .
  • the projection system may further include a power interface 100, and the power board 70 and the power interface 100 may be designed separately.
  • FIG. 15 is a rear view of a projection system provided by an embodiment of the present disclosure. As shown in FIG. 15 , the first side of the housing 00 may be provided with a power interface 100 .
  • the projection system may further include an isolation plate, the isolation plate is located between the projection screen and the power board along the height direction of the housing 00 , the isolation board is provided with a via hole, and the power line on the power board can pass through the via hole Connect to power socket 100.
  • the first side of the housing 00 may also be provided with a rack 101 , and the rack 101 may be used for placing wires and the like. Wherein, the first side of the casing 00 is parallel to the projection screen 10 and is located on the side away from the display screen of the projection screen 10 .
  • FIG. 16 is a front view of a projection system provided by an embodiment of the present disclosure.
  • the second side of the housing 00 may have a storage cabinet 102, and the storage cabinet 102 may be used to store related components such as a set-top box, a remote control, and the like.
  • the first side and the second side of the housing are opposite.
  • the laser driving assembly may include a switch tube and a high-frequency transformer.
  • the switch tube may be a metal oxide semiconductor (metal oxide semiconductor, MOS) tube.
  • MOS metal oxide semiconductor
  • the laser driving component In the process that the laser driving component provides the laser driving current for the laser, the laser driving component periodically generates a large high-frequency pulse signal, which is radiated through the laser driving line.
  • the high frequency pulse signal is the common mode signal.
  • the primary coil of the high frequency transformer is an inductive load.
  • the primary coil generates a large inrush current, and a high surge peak voltage appears at both ends of the primary coil.
  • the primary coil does not transmit part of the energy from the primary coil to the secondary coil due to the leakage magnetic flux, so that the damped oscillation with spikes formed at the primary coil is superimposed on the turn-off voltage, This results in a turn-off voltage spike.
  • the common mode signal generated by the laser driver assembly is passed to an equivalent antenna model.
  • the laser driving line can be abstracted into an antenna model, and the radiation power of the antenna can be simulated by the power consumed by a resistor R1, which can be called a radiation resistance.
  • the power P dissipated on the radiation resistance satisfies: Among them, I1 is the common mode current, the unit is mA.
  • the radiation intensity E1 generated by the common mode signal satisfies:
  • the f is the frequency at which the laser driving component provides the laser driving current to the laser
  • the unit is Hz.
  • the L1 is the length of the laser driving line
  • the r is the distance between the projection system and the test equipment, and the unit is m.
  • the laser driving current provided by the laser driving component to the laser may also be called differential mode current, the differential mode current is used to drive the laser to emit light, and the common mode current will not be used to drive the laser to emit light.
  • the radiation intensity E2 of the differential mode current satisfies: Wherein, A is the loop area of the differential mode current, and its unit is square centimeter (cm 2 ), and I2 is the magnitude of the differential mode current.
  • the current loop area A has the greatest influence on the radiation intensity of the differential mode current.
  • the frequency f of the laser driving current is greater than 50MHz
  • the quasi-peak value of the electromagnetic signal radiated by the projection system is greater than the quasi-peak value threshold
  • the current loop area needs to be optimized to reduce the difference.
  • the mode current corresponds to the radiation of the differential mode signal.
  • the projection system may further include a screen drive assembly 103 connected to the projection screen 10 , the screen drive assembly 103 capable of driving the projection screen 10 to rise out of the opening 001 to the housing 00 outside.
  • the curtain driving assembly 103 can also drive the projection screen 10 to retract from the opening 001 into the accommodating space of the housing 00 .
  • the curtain drive assembly 30 includes a lift drive assembly 1031 and a reel 1032 connected to the lift drive assembly 1031 , and the projection screen 10 is wound on the roll 1032 .
  • the lift driving assembly 1031 is used to drive the reel 1032 to rotate in one direction, so as to drive the projection screen 10 to lift out from the opening 001 to the outside of the casing 00 .
  • the lift drive assembly 1031 is also used to drive the reel 1032 to rotate in another direction, so as to drive the projection screen 10 to retract from the opening 001 into the accommodating space of the housing 001 .
  • the one direction and the other direction are opposite directions, for example, the one direction may be a counterclockwise direction and the other direction may be a clockwise direction.
  • the projection system further includes a support member 002 connected with the housing 00 , and the support member 002 is used for supporting the projection system.
  • the projection system may not be provided with the support member, that is, the projection system is a floor-standing type.
  • FIG. 23 is a schematic structural diagram of a projection system provided by the related art.
  • the projection system may include a projection screen 01 and a host 02, and the projection screen 01 is fixed on the wall.
  • the host 02 is used to project images onto the projection screen. Since the projection screen 01 and the host 02 are set separately, when the host 02 is displaced, the displayed picture will be shifted, resulting in a poor display effect. And after the screen is shifted, it is difficult to correct the screen. And because the projection screen 01 needs to be installed on the wall, the installation space of the projection screen 01 is limited, and the wall is damaged, and the aesthetics is poor.
  • the integrated projection system provided by the embodiment of the present disclosure, in which the projection screen, the optical engine, the circuit part, etc. are all located in the casing, which can effectively solve the problems existing in the above-mentioned related art.
  • the curling and lifting projection screen provided by the embodiment of the present disclosure, when the projection system is turned on for use, the projection screen is raised, and when the projection system is turned off, the projection screen is retracted into the housing space of the housing, which effectively solves the problem of screen installation in the related art. Space constraints and aesthetic issues.
  • the embodiment of the present disclosure does not need to separate the projection screen from the housing, and by adopting the above-mentioned arrangement of the optical engine, each circuit board, and the sound box, the volume of the projection system is effectively reduced, and the performance of the projection system is better. .
  • the projection system may be a laser projection television.
  • the embodiments of the present disclosure provide a projection system. Since the light valve driving board, the laser driving board, the power board, the display board and the main board in the projection system are scattered in the housing of the projection system, compared with the In the related art, a plurality of circuit boards are stacked and arranged in the casing, and this arrangement effectively reduces the thickness of the projection system.

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Abstract

本申请公开了一种投影系统，属于投影显示领域。由于该投影系统中的光阀驱动板、激光器驱动板、电源板、显示板和主板分散设置在该投影系统的壳体内，有效降低了投影系统的厚度。

Description

投影系统
相关申请的交叉引用
本公开要求在2020年9月25日提交中国专利局、申请号为202011025333.1，发明名称为投影系统的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本公开涉及投影显示领域，特别涉及一种投影系统。
背景技术
目前，投影系统可以包括投影屏幕和主机，该投影屏幕固定在墙面上。该主机用于将图像投影至投影屏幕上。
发明内容
本公开实施例提供了一种投影系统，所述投影系统包括：
壳体，所述壳体内具有容纳空间；
位于所述容纳空间内的底板、侧板、镜头组件、光阀驱动板、激光器驱动板、电源板、显示板和主板，其中，所述镜头组件、所述光阀驱动板、所述激光器驱动板、所述电源板和所述显示板均位于所述底板上，所述主板位于所述侧板上；
所述光阀驱动板和所述镜头组件沿第一方向排列，所述第一方向平行于所述投影屏幕；所述激光器驱动板位于所述光阀驱动板远离所述投影屏幕的一侧；
所述电源板位于所述镜头组件远离所述光阀驱动板的一侧，或者，位于所述激光器驱动板远离所述镜头组件的一侧；
所述显示板和所述主板均位于所述镜头组件靠近所述投影屏幕的一侧，且所述显示板和所述主板沿所述第一方向排列；
其中，所述底板的板面垂直于所述侧板的板面；所述光阀驱动板的板面和所述激光器驱动板的板面均垂直于所述底板的板面，且均垂直于所述侧板的板面；所述电源板的板面平行于所述底板的板面；所述显示板的板面和所述主板的板面均平行于所述侧板的板面。
附图说明
为了更清楚地说明本公开实施例中的技术方案，下面将对实施例描述中所需要使用的 附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本公开的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本公开实施例提供的一种投影系统的局部结构示意图；
图2是本公开实施例提供的另一种投影系统的局部结构示意图；
图3是本公开实施例提供的一种投影系统的局部结构示意图；
图4是本公开实施例提供的另一种投影系统的局部结构示意图；
图5是本公开实施例提供的又一种投影系统的局部结构示意图；
图6是本公开实施例提供的再一种投影系统的局部结构示意图；
图7是本公开实施例提供的一种各个电路板的连接示意图；
图8是本公开实施例提供的一种激光器驱动组件与激光器连接的示意图；
图9是本公开实施例提供的一种包裹激光器驱动线的屏蔽层的外侧套接磁环的示意图；
图10是本公开实施例提供的一种共模电感与激光器驱动组件和激光器连接的示意图；
图11是本公开实施例提供的另一种共模电感与激光器驱动组件和激光器连接的示意图；
图12是本公开实施例提供的一种对投影系统进行低频辐射骚扰场强测试得到的结果示意图；
图13是本公开实施例提供的一种光阀接收到光阀驱动组件传输的LVDS的眼图；
图14是本公开实施例提供的一种两个压接电阻连接的示意图；
图15是本公开实施例提供的一种投影系统的后视图；
图16是本公开实施例提供的一种投影系统的前视图；
图17是本公开实施例提供的一种将激光器驱动线抽象为单极天线的示意图；
图18是本公开实施例提供的一种将差模电流的电流环路抽象为环形天线的示意图；
图19是本公开实施例提供的一种幕布驱动组件的局部结构示意图；
图20是本公开实施例提供的另一种幕布驱动组件的局部结构示意图；
图21是本公开实施例提供的另一种投影系统的局部结构示意图；
图22是本公开实施例提供的又一种投影系统的局部结构示意图；
图23是相关技术提供的一种投影系统的结构示意图。
具体实施方式
为使本公开的目的、技术方案和优点更加清楚，下面将结合附图对本公开实施方式作进一步地详细描述。
图1是本公开实施例提供的一种投影系统的结构示意图。如图1所示，该投影系统包括壳体00，该壳体00内具有容纳空间，且该壳体00的一侧具有与容纳空间连通的开口001。参考图2，该投影系统还包括投影屏幕10。该投影屏幕10能够从该开口001升出至壳体00的外侧。或者，参考图1，该投影屏幕10可以从该开口001收回至该壳体00的容纳空间内。
参考图3和图4，该投影系统还包括位于该容纳空间内的底板20、侧板30、镜头组件40、光阀驱动板50、激光器驱动板60、电源板70、显示板80和主板90。在一些实施例中，该底板的材料可以为金属材料，例如可以为铁。
参考图5，该光阀驱动板50和镜头组件40沿第一方向V排列，该第一方向V平行于投影屏幕10。该激光器驱动板60位于光阀驱动板50远离投影屏幕10的一侧。
在一些实施例中，镜头组件40的光轴可以位于容纳空间的中截面内，且该中截面垂直于投影屏幕10。
参考图3和图4，该电源板70位于镜头组件40远离光阀驱动板50的一侧，或者，参考图6，该电源板70位于激光器驱动板60远离镜头组件40的一侧。
参考图6，该显示板80和主板90均位于镜头组件40靠近投影屏幕10的一侧，且该显示板80和主板90沿第一方向V排列。
其中，该底板20的板面垂直于侧板30的板面。该光阀驱动板50的板面和激光器驱动板60的板面均垂直于底板20的板面，且均垂直于侧板30的板面。该电源板70的板面平行于底板20的板面。该显示板80的板面和主板90的板面均平行于侧板30的板面。
综上所述，本公开实施例提供的一种投影系统，由于该投影系统中的光阀驱动板、激光器驱动板、电源板、显示板和主板分散设置在该投影系统的壳体内，相较于相关技术中多个电路板层叠设置在壳体内，该种设置方式有效降低了投影系统的厚度。
在本公开实施例中，该电源板70分别与激光器驱动板60、显示板80和主板90电连接，该电源板70用于分别向激光器驱动板60、显示板80和主板90提供电源信号。该电源板70还用于向激光器驱动板60提供激光器驱动信号，该激光器驱动板60用于在电源信号和激光器驱动信号的驱动下发射激光光束。
在一些实施例中，该电源板70还可以为投影系统中的其他功能模块提供电源信号，比如人眼保护模块、风扇和无线保真(wireless fidelity，WIFI)模块等供电，保障投影系统中的各个部分正常提供电源信号。
该主板90还与显示板80电连接，该主板90用于在电源信号的驱动下，将图像信号发送至显示板80。
该主板90上具有系统级芯片(system on chip，SoC)，该芯片能够将不同数据格式的数据解码为归一化格式，并通过，比如连接器(connector)，将归一化格式的数据传输至显示板80。
该显示板80还与光阀驱动板50电连接，该显示板80用于在电源信号的驱动下，根据图像信号生成光阀控制信号，并将光阀控制信号发送至光阀驱动板50。该光阀驱动板50中的光阀用于在该光阀驱动信号的驱动下翻转，并将激光光束传输至镜头组件40。
在一些实施例中，该显示板80可以具有算法处理模块现场可编程逻辑门阵列(field programmable gate array，FPGA)和数字光处理(digital light processing，DLP)芯片。该算法处理模块FPGA，用于对输入的图像信号进行处理，比如进行运动估计与运动补偿(motion estimation and motion compensation，MEMC)倍频处理，或者图像的校正等进行图像增强功能的实现。该DLP芯片与算法处理模块FPGA连接，用于接收处理后的图像处理信号数据，作为待显示的图像数据。需要说明的是，算法处理模块FPGA通常作为增强功能模块存在，在一些低成本方案中，也可以不设置该模块部分，该DLP芯片与主板90连接，该DLP芯片用于接收主板90输出的图像信号。
在DLP控制架构中，投影系统中的激光器部分需要配合DLP芯片及光阀驱动板中的光阀的工作时序。具体地，DLP芯片向电源板中的激光器驱动组件输出图像使能信号，也可称为基色光使能信号，通常表示为X_EN，X为不同的基色光的缩写，以及同时还输出亮度调整信号，简称为脉冲宽度调制(pulse width modulation，PWM)信号。该激光器驱动组件响应于该图像使能信号和亮度调整信号，向激光器驱动板中的激光器提供激光器驱动信号，激光器驱动板60在电源信号和该激光器驱动信号的驱动下发射激光光束。同时，伴随着光阀驱动板中的光阀时序性的对不同基色图像分量的调制过程，激光器部分需要同步的输出对应颜色的基色光光束。也就是，DLP芯片输出基色光使能信号以通知激光器使能某种颜色的激光器的点亮，以及，输出PWM信号以通知激光器驱动板中的激光器以什么样的亮度进行点亮。
参考图7，该投影系统还可以包括位于容纳空间内的第一电源线91、第二电源线92、激光器驱动线93、差分信号线94和图像信号线95。该电源板70和激光器驱动板60通过激光器驱动线93电连接。
在一些实施例中，参考图8，该电源板70中的激光器驱动组件71可以通过该激光器驱动线93与激光器驱动板60中的激光器61连接。在一些实施例中，该电源板70中的激光器驱动组件71通过该激光器驱动线93向激光器驱动板60中的激光器61提供电源信号和激光器驱动信号。
该电源板70与主板90通过第二电源线92电连接。该主板90与显示板80通过图像信号线95电连接。在一些实施例中，该电源板70可以通过该第二电源线92向主板90提供电源信号，该主板90通过该图像信号线95向显示板80发送图像信号。
该电源板70和显示板80通过第一电源线91电连接，该显示板80和光阀驱动板50通过差分信号线94电连接。在一些实施例中，该电源板70可以通过该第一电源线91向显示板80提供电源信号，该显示板80通过该差分信号线94向光阀驱动板50发送光阀控制信号。
其中，该第一电源线91、第二电源线92、激光器驱动线93、差分信号线94和图像信号线95均与底板20接触，且该底板20接地。
在本公开实施例中，该第一电源线91、第二电源线92、激光器驱动线93、差分信号线94和图像信号线95在传递电流信号的过程中，也会传递一部分共模信号，该共模信号会通过该多个连接线辐射至壳体00的外部。
由于该底板20接地，因此可以将经过该第一电源线91、第二电源线92、激光器驱动线93、差分信号线94和图像信号线95传输的电磁信号导入大地，避免较多的电磁信号辐射至壳体的外侧而对用户造成影响。
参考图9，该投影系统还可以包括屏蔽层96。该屏蔽层96包裹在激光器驱动线93的外侧，且屏蔽层96接地。
在一些实施例中，该屏蔽层96的两端可以均接地，也可以一端接地。该屏蔽层96的材料可以为金属材料，例如，该金属材料可以为红铜或者镀锡铜。该屏蔽层96可以为网状的编织层。
由于该屏蔽层96包裹在激光器驱动线93的外侧，且屏蔽层96接地，因此能够将激光器驱动线93传输的共模信号通过屏蔽层96传导至大地中，实现将共模信号屏蔽在投影系统的内部，避免出现激光器驱动线传输的共模信号较多的辐射到壳体外侧，对用户造成影响的情况，从而减小对用户的影响。同时确保投影系统的共模干扰符合电磁兼容限值要求，确保投影系统能够通过电磁干扰(electro-magnetic interference，EMI)测试，进而确保投影系统合格。
参考图9，该屏蔽层96可以与该底板20连接。由于该屏蔽层96和底板20的材料均为金属材料，且该底板20接地。因此屏蔽层96与该底板20连接，可以实现屏蔽层96接地。
在一些实施例中，该屏蔽层96的该两端可以直接与底板20连接。或者，该屏蔽层96的两端可以通过金属线与底板20连接。或者，该屏蔽层96的一端可以直接与底板20连 接，该屏蔽层96的另一端可以通过金属线与底板20连接。
在一些实施例中，电源板70和激光器驱动板60之间的距离小于或等于700毫米(mm)。该电源板70和激光器驱动板60之间的距离的长度越短，该激光器驱动线93越短，则通过激光器驱动线传输的共模信号的越少，因此通过激光器驱动线93辐射至壳体00外侧的共模信号越少。
在一些实施方式中，参考图9，该投影系统还包括磁环97，该磁环97套接在屏蔽层96的外侧，且该磁环97的长度小于屏蔽层96的长度，即该磁环97仅覆盖部分屏蔽层96。通过在该屏蔽层96的外侧套接磁环97，能够增大共模电流传输路径上的阻抗，即增大激光器驱动线93的阻抗，从而有效抑制共模信号，减小该激光器驱动线上的共模电流，从而减少向壳体外辐射的共模信号。
在一些实施方式中，该投影系统还包括位于容纳空间的共模电感。该共模电感通过激光器驱动线93串联在电源板70和激光器驱动板60之间。通过在电源板70和激光器驱动板60之间串联共模电感，能够增大共模电流传输路径上的阻抗，即增大激光器驱动线93的阻抗，从而有效抑制激光器驱动组件71产生的共模信号，减小该激光器驱动线上的共模电流，从而减少向壳体的外部辐射的共模信号。
在一些实施例中，参考图10，该电源板70可以包括第一电路板72、位于该第一电路板72上的激光器驱动组件71和第一共模电感73。该第一共模电感73通过激光器驱动线93串联在该电源板70中的激光器驱动组件71和激光器驱动板60中的激光器61之间。
或者，参考图11，该激光器驱动板60包括第二电路板62、位于该第二电路板62上的激光器61和第二共模电感63。该第二共模电感63通过激光器驱动线93串联在该电源板70中的激光器驱动组件71和激光器驱动板60中的激光器61之间。
或者，该第一电路板72上可以设置有第一共模电感73，且该第二电路板62上可以设置有第二共模电感63。
在本公开实施例中，在电源板70和激光器驱动板60之间的距离小于或等于700mm，激光器驱动线93上缠绕屏蔽层，且该屏蔽层96上套接有磁环97或者该投影系统包括共模电感的场景下，通过测试设备对投影系统进行远场的低频辐射骚扰场强测试。图12是本公开实施例提供的一种对投影系统进行低频辐射骚扰场强测试得到的结果示意图。如图12所示，该结果示意图中的横坐标表示测试设备的测试频率，即该测试设备中的天线的工作频率，其单位为兆赫兹(MHz)。该测试频率范围为30MHz～1000MHz。该结果示意图中的纵坐标表示电磁信号的准峰值，其单位为分贝(decibel，db)。
该结果示意图中的第一曲线X1为在测试频率30MHz～1000MHz范围内，该投影系统 辐射的电磁信号的准峰值曲线图，该投影系统的电磁信号的准峰值越大，表明投影系统辐射的电磁信号越强，该电磁信号包括上述共模信号。该结果示意图中的第二曲线X2为在测试频率30MHz～1000MHz范围内，满足民用级CISPR22Class B低频辐射骚扰场强测试的电磁信号的准峰值阈值曲线图。
若该第一曲线X1中的任一准峰值位于第二曲线X2的上方，则可以确定该投影系统辐射的电磁信号较多，无法满足使用要求。若该第一曲线X1位于该第二曲线X2的下方，则可以确定投影系统辐射的电磁信号较少，满足使用要求。
从图12可以看出，在测试频率30MHz～1000MHz范围内，该第一曲线X1位于该第二曲线X2下方，即在任一测试频率下，该投影系统辐射的电磁信号的准峰值小于对应的准峰值阈值。由此可知，该投影系统通过了民用级CISPR22Class B的低频辐射场强骚扰测试，该投影系统满足使用要求。
表1示出了测试设备对投影系统进行测试过程中，对测试设备的调试参数、投影系统辐射的电磁信号的准峰值、电磁信号的准峰值阈值、准峰值阈值与准峰值的差值。该调试参数可以包括测试设备的测试频率，测试时长，测试设备距离底面的高度，极性和测试设备中天线的角度。其中，该极性为V，表示测试设备的天线与投影系统垂直。测试时长的单位为ms，带宽的单位为千赫兹(kHz)，其单位为厘米(cm)。
从表1可以得出，若测试设备的测试频率为36.8910MHz，该投影系统辐射的电磁信号的准峰值为30.38，准峰值阈值为40，由于该准峰值30.38小于准峰值阈值40，因此可以确定在测试设备的测试频率为36.8910MHz时，该投影系统辐射的电磁信号较小。
表1
Figure PCTCN2021118233-appb-000001
由以上表1和图12可知，在电源板70和激光器驱动板60之间的距离小于或等于700mm，激光器驱动线93上缠绕屏蔽层，且该屏蔽层96上套接有磁环97或者该投影系统包括共模电感的场景下，该投影系统通过了低频辐射骚扰场强测试，即该投影系统满足使用要求。
在本公开实施例中，该显示板80和光阀驱动板50之间的距离能够根据该显示板80中的光阀控制组件和光阀驱动板50中的光阀之间的通讯速率确定。
在本公开实施例中，该显示板80和光阀驱动板50之间通过低电压差分信号(low-voltage differential signaling，LVDS)线连接。因此，显示板80中的光阀控制组件可以以LVDS格式向光阀驱动板50中的光阀传输光阀控制信号。该光阀在该光阀控制信号的控制下进行翻转，该翻转后的光阀用于将该照射至其表面的光束调制成影像光束，并将该影像光束传输至镜头组件40。该镜头组件40用于将该影像光束传输至投影屏幕10，以实现在该投影屏幕10上显示该图像。
在一些实施例中，该光阀控制组件和光阀之间的通讯速率小于或等于1.6吉比特每秒(Gbps)，该显示板80和光阀驱动板50之间的距离小于或等于254毫米mm，即显示板80和光阀驱动板50之间连接的LVDS线的长度小于或等于254mm。由此可以确保光阀驱动板50中的光阀接收到的差分信号质量良好。
在显示板80和光阀驱动板50之间的距离小于或等于254mm的场景下，图13是本公开实施例提供的一种光阀接收到光阀驱动组件传输的LVDS的眼图。如图13所示，该眼图的横坐标为时间，单位为皮秒(picosecond，ps)，纵坐标为光阀接收到的LVDS的电压，单位为毫伏(millivolt，mV)。
从图13可以看出，光阀接收到的LVDS的电压位于第一阈值和第二阈值之间，且该LVDS的最大电压与第一阈值的产差值较大，该LVDS的最小电压与第二阈值的差值也较大。其中，该第一阈值为400mV，该第二阈值为-400mV。同时该LVDS中的交叉点P1和交叉点处P2的电压均较小，表明LVDS的抖动较小，即该LVDS的质量较好，且LVDS发生误码的可能性较低。综上可以看出，在该显示板80与光阀驱动板50之间距离小于或等于254mm时，该光阀接收到的LVDS的质量较好。
在本公开实施例中，主板90和显示板80的供电电压为12伏(V)，其最小的输入电压为大于或等于11V。若显示板80的输入电压小于11V，则显示板80就会进入系统复位。因此，在布局主板90和显示板80时，需要考虑主板90、显示板80和电源板70之间的距离。
参考图14，假设显示板80和电源板70，或者主板90和电源板70连接的导线上的电流是I，该导线的线长为L，该导线两端的压接电阻为Rt。导线的单位长度电阻为ρ。则该显示板80或主板90从电源板70接收到的电压为U满足：U＝12-I×(ρ×L+2×Rt)。示例的，若该导线的单位长度电阻为150欧/千米(Ω/Km)，此时环境温度为20摄氏度，电流I为2A，压接电阻Rt为100毫欧(mΩ)。则该导线的长度小于或等于1.5m。
在本公开实施例中，该显示板80和电源板70，以及电源板70和主板90之间的距离均小于或等于600mm。该主板90与显示板80之间的距离小于或等于700mm。该距离能 够在确保主板90与显示板80接收到的电压大于或等于11V的同时，保证显示板和电源板之间的距离，主板和显示板之间的距离，以及主板和电源板之间的距离较短。
参考图5，该镜头组件40可以包括第一镜头子组件41、第二镜头子组件42和反射子组件43，该第二镜头子组件42的光轴与第一镜头子组件41的光轴相交。该第一镜头子组件41用于将光阀驱动板50传输的激光光束传输至反射子组件43。该反射子组件43用于将激光光束反射至第二镜头子组件42。该第二镜头子组件42用于将激光光束投射至投影屏幕10。
由于该镜头组件中的第一镜头子组件的光轴和第二镜头子组件的光轴不相交。使得镜头组件中部分光学镜片沿第二镜头子组件的光轴方向排列，其余光学镜片沿第一镜头子组件的光轴方向排列，因此，有效缩减了沿第二镜头子组件的光轴方向排列的光学镜片的个数，进而缩短了第二镜头子组件的出光侧与投影屏幕之间的距离，降低了投影系统的投射比，该种排布方式能够适用于超短焦投影系统中。
参考图6，该投影系统还可以包括光传输组件98，该光传输组件98位于该激光器驱动板60的出光侧，该光传输组件98用于将该激光器驱动板60中的激光器61发射的激光光束传输至光阀驱动板50。
在本公开实施例中，该投影系统还可以包括位于该壳体00的容纳空间内的引擎承载板和电路承载板。该引擎承载板和电路承载板均位于底板上。光学引擎位于该引擎承载板上，电路部位于该电路承载板上。其中，该光学引擎可以包括上述的激光器驱动板60、光传输组件98、光阀驱动板50和镜头组件40。电路部可以包括上述显示板80和电源板70。
在一些实施例中，该引擎承载板和电路承载板的材料可以均为金属材料，例如，该金属材料可以为铁。该引擎承载板的强度大于该电路承载板的强度，由于该光学引擎的重量通常大于电路部的重量，该引擎承载板的强度大于电路承载板的强度能够确保对光学引擎承载的稳定性。同时由于该光学引擎和电路部设置在不同的承载板上，因此可以仅增大引擎承载板的强度，而无需增大电路承载板的强度，由此在提高了对光学引擎和电路部设置的灵活性的同时，节约了投影系统的制造成本。
在本公开实施例中，该光学引擎和投影屏幕相对设置。由于该光学引擎的投影镜头为超短焦镜头，因此，该投影镜头与投影屏幕之间的位置须严格对位。本公开实施例通过将光学引擎和电路部设置在不同的承载板上，还可以有效避免电路部对光学引擎的影响，确保光学引擎的正常工作，从而确保投影系统的显示效果。
在本公开实施例中，该投影系统还可以包括多个音箱部99。参考图4，该投影系统还包括两个音箱部99，一个音箱部99位于该光阀驱动板50远离镜头组件40的一侧，另一 个位于电源板70远离镜头组件40的一侧。
在一些实施例中，壳体00可以包括相对设置的上壳体和下壳体，该音箱部99可以位于该下壳体上。或者该音箱部99可以位于底板20上。
在本公开实施例中，该投影系统还可以包括电源接口100，该电源板70和电源接口100可以分开设计。图15是本公开实施例提供的一种投影系统的后视图。如图15所示，该壳体00的第一侧可以设置有电源接口100。该投影系统还可以包括隔离板，该隔离板沿壳体00的高度方向上位于投影屏幕和电源板之间，该隔离板上设置有过孔，电源板上的电源线可以穿过该过孔与电源插口100连接。参考图15，该壳体00的第一侧还可以设置有置物架101，该置物架101可以用于放置走线等。其中，该壳体00的第一侧为平行于投影屏幕10，且位于远离投影屏幕10显示画面的一侧。
图16是本公开实施例提供的一种投影系统的前视图。如图16所示，该壳体00的第二侧可以具有置物柜102，该置物柜102可以用于放置机顶盒、遥控器等相关部件。该壳体的第一侧和第二侧相对。
在设计电源板和激光器之间的距离时，需要考虑到电磁干扰。在一实施中，激光器驱动组件可以包括开关管和高频变压器组成。该开关管可以为金属氧化物半导体(metal oxide semiconductor，MOS)管。在激光器驱动组件为激光器提供激光器驱动电流的过程中，该激光器驱动组件会周期性产生较大的高频脉冲信号，并通过激光器驱动线辐射。该高频脉冲信号即为共模信号。
其中，该共模信号产生的主要原因是该高频变压器初级线圈为感性负载。在开关管导通的瞬间，该初级线圈产生较大的涌流，并在初级线圈的两端出现较高的浪涌尖峰电压。在开关管关断的瞬间，该初级线圈由于漏磁通，导致部分能量没有从初级线圈传输到次级线圈，使得该初级线圈处形成的带有尖峰的衰减振荡，叠加在关断电压上，从而形成关断电压尖峰。
在一实施中，假设激光器驱动组件产生的共模信号是传递到一个等效的天线模型上。则可以将激光器驱动线抽象成一个天线模型，该天线的辐射功率可以用在一个电阻R1上消耗的功率来模拟，该电阻R1可以称为辐射电阻。辐射电阻上消耗的功率P满足：
Figure PCTCN2021118233-appb-000002
Figure PCTCN2021118233-appb-000003
其中，I1为共模电流，单位为mA。
在一些实施例中，参考图17，假设将激光器驱动线抽象成单极天线，则该共模信号产生的辐射强度E1满足：
Figure PCTCN2021118233-appb-000004
其中，该f为激光器驱动组件向激光器提供激光器驱动电流的频率，其单位为Hz。该L1为激光器驱动线的长 度，该r为投影系统与测试设备之间的距离，其单位为m。
激光器驱动组件向激光器提供的激光器驱动电流也可以称为差模电流，该差模电流用于驱动激光器发光，该共模电流不会用于驱动激光器发光。参考图18，假设将差模电流的电流环路等效为环形天线，则该差模电流的辐射强度E2满足：
Figure PCTCN2021118233-appb-000005
其中，该A为差模电流的环路面积，其单位为平方厘米(cm 2)，I2为差模电流的大小。
则差模电流的辐射强度E2和共模电流的辐射强度E1的比值k满足，
Figure PCTCN2021118233-appb-000006
Figure PCTCN2021118233-appb-000007
则若k等于1，A＝L1，且I1＝I2，则可以得到f＝47.9MHz。
则若激光器驱动电流的频率f大于50MHz，电流环路面积A对差模电流的辐射强度影响最大。在进行远场的低频辐射场强骚扰测试时，在激光器驱动电流的频率f大于50MHz时，投影系统辐射的电磁信号的准峰值大于准峰值阈值，则需要优化电流环路面积，从而减小差模电流对应的差模信号的辐射。同时也需要降低共模电流的辐射强度，比如上述实现方式中，在屏蔽层上增加磁环或者在电源板上增加共模电感，由此增大共模阻抗，减小共模电流。
在一些实施例中，参考图19，该投影系统还可以包括与该投影屏幕10连接的幕片驱动组件103，该幕片驱动组件103能够驱动该投影屏幕10从开口001升出至壳体00的外侧。该幕布驱动组件103还能够驱动该投影屏幕10从该开口001收回至该壳体00的容纳空间内。
在一些实施例中，参考图19、图20和图21，该幕布驱动组件30包括升降驱动组件1031和与该升降驱动组件1031连接的卷筒1032，该投影屏幕10缠绕在该卷筒1032上。该升降驱动组件1031用于驱动该卷筒1032沿一个方向转动，以带动该投影屏幕10从开口001升出至壳体00的外侧。该升降驱动组件1031还用于驱动该卷筒1032沿另一个方向转动，以带动该投影屏幕10从该开口001收回至壳体001的容纳空间内。在一些实施中，该一个方向和另一个方向为相反的方向，例如，该一个方向可以为逆时针方向，该另一个方向可以顺时针方向。
在本公开一些实施例中，参考图21和图22，该投影系统还包括支撑件002，该支撑件002与壳体00连接，该支撑件002用于支撑该投影系统。在一些实施例中，该投影系统还可以不设置该支撑件，即该投影系统为落地式。
图23是相关技术提供的一种投影系统的结构示意图。如图23所示，该投影系统可以包括投影屏幕01和主机02，该投影屏幕01固定在墙面上。该主机02用于将图像投影至 投影屏幕上。由于投影屏幕01和主机02分开设置，在该主机02发生移位的情况下，显示的画面发生偏移，导致显示效果较差。且在画面发生偏移后，对画面校正难度较大。且由于需要将投影屏幕01安装在墙面上，导致投影屏幕01的安装空间受限，且对墙面有损坏，美观性较差。
本公开实施例提供的一体式投影系统，该投影系统中的投影屏幕与光学引擎和电路部等均位于壳体内，可以有效解决上述相关技术中存在的问题。本公开实施例提供的卷曲可升降的投影屏幕，在投影系统开启使用时，该投影屏幕升起，投影系统关机时，该投影屏幕收回至壳体的容纳空间内有效解决了相关技术中屏幕安装空间受限及美观度的问题。
且本公开实施例无需将投影屏幕与壳体分离，通过采用上述对光学引擎、各个电路板和音箱部等的排布方式，在有效缩小投影系统的体积的同时，使得投影系统的性能较优。
在一些实施例中，该投影系统可以为激光投影电视机。
综上所述，本公开实施例提供了一种投影系统，由于该投影系统中的光阀驱动板、激光器驱动板、电源板、显示板和主板分散设置在该投影系统的壳体内，相较于相关技术中多个电路板层叠设置在壳体内，该种设置方式有效降低了投影系统的厚度。
以上所述仅为本公开的可选实施例，并不用以限制本公开，凡在本公开的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本公开的保护范围之内。

Claims (10)

  1. 一种投影系统，其特征在于，所述投影系统包括：
    壳体，所述壳体内具有容纳空间；
    位于所述容纳空间内的底板、侧板、镜头组件、光阀驱动板、激光器驱动板、电源板、显示板和主板，其中，所述镜头组件、所述光阀驱动板、所述激光器驱动板、所述电源板和所述显示板均位于所述底板上，所述主板位于所述侧板上；
    所述光阀驱动板和所述镜头组件沿第一方向排列，所述第一方向平行于所述投影屏幕；
    所述激光器驱动板位于所述光阀驱动板远离所述投影屏幕的一侧；
    所述电源板位于所述镜头组件远离所述光阀驱动板的一侧，或者，位于所述激光器驱动板远离所述镜头组件的一侧；
    所述显示板和所述主板均位于所述镜头组件靠近所述投影屏幕的一侧，且所述显示板和所述主板沿所述第一方向排列；
    其中，所述底板的板面垂直于所述侧板的板面；所述光阀驱动板的板面和所述激光器驱动板的板面均垂直于所述底板的板面，且均垂直于所述侧板的板面；所述电源板的板面平行于所述底板的板面；所述显示板的板面和所述主板的板面均平行于所述侧板的板面。
  2. 根据权利要求1所述的投影系统，其特征在于，所述电源板分别与所述激光器驱动板、所述显示板和所述主板电连接，所述电源板用于分别向所述激光器驱动板、所述显示板和所述主板提供电源信号；
    所述电源板还用于向所述激光器驱动板提供激光器驱动信号，所述激光器驱动板用于在所述电源信号和所述激光器驱动信号的驱动下发射激光光束；
    所述主板还与所述显示板电连接，所述主板用于在所述电源信号的驱动下，将图像信号发送至所述显示板；
    所述显示板还与所述光阀驱动板电连接，所述显示板用于在所述电源信号的驱动下，根据所述图像信号生成光阀控制信号，并将所述光阀控制信号发送至所述光阀驱动板；
    所述光阀驱动板中的光阀用于在所述光阀驱动信号的驱动下翻转，并将所述激光光束传输至所述镜头组件。
  3. 根据权利要求1所述的投影系统，其特征在于，所述投影系统还包括：位于所述容纳空间内的第一电源线、第二电源线、激光器驱动线、差分信号线和图像信号线；
    所述电源板和所述激光器驱动板通过所述激光器驱动线电连接；
    所述电源板和所述显示板通过所述第一电源线电连接；
    所述显示板和所述光阀驱动板通过所述差分信号线电连接；
    所述电源板与所述主板通过所述第二电源线电连接；
    所述主板与所述显示板通过所述图像信号线电连接；
    其中，所述第一电源线、所述第二电源线、所述激光器驱动线、所述差分信号线和所述图像信号线均与所述底板接触。
  4. 根据权利要求3所述的投影系统，其特征在于，所述投影系统还包括：位于所述容纳空间内的屏蔽层；
    所述屏蔽层包裹在所述激光器驱动线的外侧，且所述屏蔽层接地。
  5. 根据权利要求4所述的投影系统，其特征在于，所述投影系统还包括：位于所述容纳空间内的磁环，所述磁环套接在所述屏蔽层的外侧，且所述磁环的长度小于所述屏蔽层的长度。
  6. 根据权利要求3所述的投影系统，其特征在于，所述投影系统还包括：位于所述容纳空间内的共模电感；
    所述共模电感通过所述激光器驱动线串联在所述电源板和所述激光器板之间。
  7. 根据权利要求1至6任一所述的投影系统，其特征在于，所述激光器驱动板和所述电源板之间的距离，以及所述主板和所述显示板之间的距离均小于或等于700毫米；
    所述电源板和所述显示板之间的距离，以及所述电源板和所述主板之间的距离均小于或等于600毫米。
  8. 根据权利要求1至6任一所述的投影系统，其特征在于，所述显示板和所述光阀驱动板之间的距离根据所述显示板中的光阀驱动组件和所述光阀驱动板中的光阀之间的通讯速率确定。
  9. 根据权利要求8所述的投影系统，其特征在于，所述光阀驱动组件和所述光阀之间的通讯速率小于或等于1.6吉比特每秒，所述显示板和所述光阀驱动板之间的距离小于或等于254毫米。
  10. 根据权利要求1至6任一所述的投影系统，其特征在于，所述镜头组件包括第一镜头子组件、第二镜头子组件和反射子组件，所述第二镜头子组件的光轴与所述第一镜头子组件的光轴相交；
    所述第一镜头子组件用于将所述光阀驱动板传输的激光光束传输至所述反射子组件；
    所述反射子组件用于将所述激光光束反射至所述第二镜头子组件；
    所述第二镜头子组件用于将所述激光光束投射至所述投影屏幕。
PCT/CN2021/118233 2020-09-25 2021-09-14 投影系统 WO2022062966A1 (zh)

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