LED movie screen power consumption management method

Abstract

The invention provides a power consumption management method for an LED movie screen, and the method comprises the steps: employing a switching power supply with double DC output and a control end EN for all LED display screen bodies of the LED movie screen; the switching power supply is provided with two paths of direct current (DC) outputs DCA and DCB, and the DCA supplies power to the LED display module and is controlled by the EN; the DCB is only supplied to a receiving card of the LED display screen body, is always and effectively supplied with power, and is not controlled by the EN; other outputs of the LED display screen body are controlled by the control end EN, and when the control end EN receives a standby or awakening instruction, the DCA is controlled to be powered off or recovered. According to the LED movie screen power consumption management method, black screen power consumption is reduced, and energy conservation is achieved. The difference from direct shutdown is that a blank screen energy-saving state can be quickly entered and can be quickly recovered, and automatic control or manual instruction control can be realized.

Description

Technical Field

[0001] This invention relates to an LED cinema screen, and more particularly to a method for managing the power consumption of an LED cinema screen. Background Technology

[0002] Currently, LED cinema screens (LED Walls) represent a revolutionary direction in cinema display technology. Based on self-emissive LED technology, they are gradually replacing traditional projection screens, achieving breakthroughs in brightness and sound transmission. The current LED cinema screen market is dominated by domestic brands. Brands such as CINITY and Leyard have achieved international certification breakthroughs through technological innovation, with their core advantages reflected in high-precision configurations such as 4K / 120fps high-format projection and full sound transmission technology.

[0003] The technical features of LED cinema screens are as follows: (1) Image quality revolution: 3840Hz ultra-high refresh rate eliminates ghosting, brightness reaches 300nit (3 times that of traditional projection), HDR technology achieves a contrast ratio of 1,000,000:1, and supports 98% DCI-P3 color gamut coverage. (2) Acoustic breakthrough: For example, Nanjing Lopu pioneered a 20-meter 4K fully transparent sound screen with a perforation rate of 25% and an audio-visual synchronization error of <5ms. CINITY LED uses a customized audio algorithm to achieve a sound and image positioning accuracy of ±0.5°. (3) Projection innovation: Supports projection with lights on (ambient light tolerance up to 500 lux), breaking the limitations of traditional cinema dark environments. Modular design enables rapid installation in 8 hours and reduces maintenance costs by 60%.

[0004] like Figure 1 As shown, the LED cinema screen generally consists of an LED display screen body and a backpack box. The main power-consuming part is the screen body, which is composed of dozens to hundreds of unit cabinets. Each cabinet consists of several LED display modules, a switching power supply, and a HUB board (integrated interface board) containing LED receiver cards. The main power-consuming part is the LED display modules. The backpack box houses a cinema server IMB (Integrated Media Module) and a transmitting card for the LED controller, used to receive data from the TMS (Theater Management System).

[0005] The main components of the LED display module are LED chips and driver ICs, and its power consumption can be divided into two categories:

[0006] (1) Average power consumption during normal playback. Since LED cinema screens are active light-emitting displays, this power consumption is highly related to the content. On average, it is about 30% of the power consumption of the white field brightness, and it varies with the brightness of the content being played.

[0007] (2) Black screen power consumption: During non-screening periods, the displayed content is a completely black screen. Since the driver IC itself is still working, even though the LED beads are not lit, the driver IC itself will still consume a certain amount of power, about 2-3W per LED module. This type of power consumption is fixed and exists as long as the LED display module is powered on, and it is unrelated to the screened content. This type of power consumption is actually ineffective power consumption.

[0008] As can be seen from the above, during periods when no projection is required, the black screen power consumption can be eliminated by individually shutting off the power supply to all LED display modules, thus achieving energy saving. Summary of the Invention

[0009] This invention provides a power consumption management method for LED cinema screens, solving the power consumption problem of the driver IC of the LED display module in the LED cinema screen when it is turned off during non-screening periods. The technical solution is as follows:

[0010] A power consumption management method for an LED cinema screen involves using a switching power supply with dual DC outputs and a control terminal EN for all LED display panels. The switching power supply has two DC outputs, DCA and DCB. DCA supplies power to the LED display modules and is controlled by EN. DCB only supplies power to the receiving card of the LED display panel and is always effectively powered, but is not controlled by EN. The other outputs of the LED display panels are controlled by the control terminal EN. When the control terminal EN receives a "standby" or "wake-up" command, it controls DCA to power off or restore.

[0011] The IMB has two additional device commands: "standby" and "wake-up". These commands use TCP / IP packets and conform to the communication protocol with the LED cinema screen.

[0012] In the backpack box of the LED cinema screen, the sending card responds to the "standby" and "wake-up" commands issued by the IMB and distributes them to all receiving cards inside the LED display screen through the internal communication channel.

[0013] In the LED display cabinet of the LED cinema screen, after receiving a "standby" command, the receiving card sets the control signal to a low level to control the switching power supply to turn off the DCA output; after receiving a "wake-up" command distributed by the sending card, it sets the control signal to a high level to control the switching power supply to turn on the DCA output.

[0014] Standby processing includes the following steps:

[0015] S1: TMS determines whether the LED cinema screen is currently empty or in between screenings based on film schedule and ticketing system data;

[0016] S2: TMS sends a signal to the backpack box of the LED cinema screen via Ethernet, controlling IMB to issue a "standby" device command;

[0017] S3: After receiving the "standby" device instruction from IMB, the sending card distributes it to the receiving cards of all LED display screens that need to be in standby mode through the internal communication channel of the LED cinema screen.

[0018] S4: The receiver card controls the switching power supply to shut off the DC power supply DCA to the LED display module via the control signal EN, thereby achieving standby mode.

[0019] The recovery process includes the following steps:

[0020] S11: TMS determines which LED movie screens need to be resumed playback based on the film schedule and ticketing system data;

[0021] S12: TMS sends a signal to the backpack box of the LED cinema screen via Ethernet, controlling IMB to issue a "restore" device command;

[0022] S3: After receiving the "restore" device instruction from IMB, the sending card distributes it to the receiving cards of all LED display screens that need to be restored through the internal communication channel of the LED cinema screen.

[0023] S4: The receiver card controls the switching power supply to turn on the DC power supply DCA to the LED display module via the control signal EN, thereby achieving recovery.

[0024] Furthermore, the DCA output power is 100-300W, and the DCB output power is 5-15W.

[0025] An LED cinema screen power management device is disclosed. The LED cinema screen includes an LED display body and a backpack box. The LED display body includes multiple unit boxes, each unit box including an LED display module, a switching power supply and a HUB board carrying an LED receiving card. The backpack box contains a cinema server IMB and a transmitting card with an LED controller.

[0026] All unit cabinets of the LED display screen adopt a switching power supply with dual DC output and control terminal EN. The switching power supply has two DC outputs, DCA and DCB. DCA supplies power to the LED display module and is controlled by EN; DCB only supplies power to the receiving card of the LED display screen and is always effectively powered, and is not controlled by EN; when the control terminal EN receives a "standby" or "wake-up" command, it controls DCA to power off or restore power.

[0027] The aforementioned LED cinema screen power consumption management method enables the LED cinema screen to have a standby function. This means that when a movie is not being played, only the power supply to the LED display module can be turned off, while the power supply to the backpack box and HUB board remains on. This ensures that the communication and controller (backpack box, HUB / receiver card) of the LED cinema screen are powered on and function normally, displaying a "black screen" state, thereby significantly reducing power consumption. Correspondingly, when display is needed, the power supply to the LED display module can be turned on by the controller, which is always in normal operation, to quickly restore normal display, i.e., the "wake-up" function.

[0028] The LED cinema screen power management method provided in this solution aims to reduce power consumption when the screen is off and achieve energy saving. Unlike direct shutdown, it allows for rapid entry into a black screen energy-saving state and quick recovery, and can be controlled automatically or manually.

[0029] The applicable scenarios for this technical solution are as follows: (1) Temporary suspension of screenings, for example, a movie is not shown due to zero ticket sales or other temporary reasons, i.e., an empty theater. In this case, the LED movie screen can be controlled to enter standby mode through the TMS (theater management system) to save electricity and reduce the operating costs of the cinema. (2) Between movie screenings, the intermission time between movie screenings is generally 5 to 15 minutes, during which time the movie screen can enter standby mode. It can be seen that the LED movie screen is a complex electronic system including many modules such as playback, communication, and display. It is not a single device. Realizing the standby function in the aforementioned scenarios is a system-wide coordination and collaboration. Attached Figure Description

[0030] Figure 1 This is a structural schematic diagram of the LED cinema screen;

[0031] Figure 2 This is a flowchart of the LED cinema screen power consumption management method. Detailed Implementation

[0032] like Figure 2 As shown, the LED cinema screen power consumption management method includes the following steps in standby mode:

[0033] S1: TMS determines whether the LED cinema screen is currently empty or in between screenings based on film schedule and ticketing system data;

[0034] S2: TMS sends a signal to the backpack box of the LED cinema screen via Ethernet, controlling IMB to issue a "standby" device command;

[0035] S3: After receiving the "standby" device instruction from IMB, the sending card distributes it to the receiving cards of all LED display screens that need to be in standby mode through the internal communication channel of the LED cinema screen.

[0036] S4: The receiver card controls the switching power supply to shut off the DC power supply DCA (representing one DC output) to the LED display module via the control signal EN, thereby achieving standby mode.

[0037] In this way, both the LED beads and the driver IC of the LED display module will be turned off, and the driver IC will no longer consume power.

[0038] During this period, since the power supply DCB (representing another DC output) of the LED display screen's receiver card is always continuously supplied, the internal communication of the LED cinema screen is always effective. When it is woken up, the LED display module only needs to be powered on again, and normal display can be restored in seconds.

[0039] Similarly, the recovery process includes the following steps:

[0040] S11: TMS determines which LED movie screens need to be resumed playback based on the film schedule and ticketing system data;

[0041] S12: TMS sends a signal to the backpack box of the LED cinema screen via Ethernet, controlling IMB to issue a "restore" device command;

[0042] S3: After receiving the "restore" device instruction from IMB, the sending card distributes it to the receiving cards of all LED display screens that need to be restored through the internal communication channel of the LED cinema screen.

[0043] S4: The receiving card controls the switching power supply to turn on the DC power supply DCA (representing one DC output) to the LED display module via the control signal EN, thereby realizing the recovery.

[0044] In summary, this invention utilizes a dual DC output switching power supply with a control terminal EN for the LED display screen. Besides the standard AC-DC conversion function of a switching power supply, this power supply also features two DC outputs, DCA and DCB. DCA has a higher output power of 100-300W, supplying the LED display module; the other outputs are controlled by EN. DCB has a lower output power of 5-15W, specifically supplying the receiver card and is always active, not controlled by EN.

[0045] The IMB adds two device commands: "Standby" and "Wake Up". These commands are actually TCP / IP packets and conform to the proprietary communication protocol with the LED control system. Correspondingly, corresponding logic is added to the receiving and transmitting cards:

[0046] (1) Sending Card: Adds functionality to respond to the “standby” and “wake-up” commands issued by IMB and distribute them to all receiving cards in the LED display screen through the internal communication channel.

[0047] (2) Receiver card: Adds the function that, after receiving the “standby” command distributed by the sender card, sets the control signal to low level to control the switching power supply to turn off the DCA output; after receiving the “wake-up” command distributed by the sender card, sets the control signal to high level to control the switching power supply to turn on the DCA output.

[0048] In the embodiment:

[0049] The test system was built using an LED cinema screen, specifically the Zhongying Guangfeng VLED cinema screen, model CL10-4k, which consists of 96 cabinets. Each cabinet contains 12 LED modules.

[0050] IMB: Uses STAR-2424 from Zhongying Guangfeng, and creates standby (eco=0) and wake-up (eco=1) device commands using the following text:

[0051] <device address="192.168.254.254" changed="true" connection="TCP" enabled="true" linefeedtype="NONE" localport="" model="" name="nova" port="8009" type="NETWORKSOCKET">

[0052] <control-cue name="led_1" value="0x6c 0x65 0x64 0x3d 0x31" / >

[0053] <control-cue name="led_0" value="0x6c 0x65 0x64 0x3d 0x30" / >

[0054] <control-cue name="eco=0" value="0x65,0x63,0x6F,0x3D,0x30" / >

[0055] <control-cue name="eco=1" value="0x65,0x63,0x6F,0x3D,0x31" / >

[0056] <control-cue name="display_1" value="0x64 0x69 0x73 0x70 0x6c 0x610x79 0x3d 0x31" / >

[0057] <control-cue name="display_0" value="0x64 0x69 0x73 0x70 0x6c 0x610x79 0x3d 0x30" / >

[0058] <control-cue name="presetshortcut=1" value="0x70 0x72 0x65 0x73 0x650x74 0x73 0x68 0x6f 0x72 0x74 0x63 0x75 0x74 0x3d 0x31" / >

[0059] <control-cue name="presetshortcut=2" value="0x70 0x72 0x65 0x73 0x650x74 0x73 0x68 0x6f 0x72 0x74 0x63 0x75 0x74 0x3d 0x32" / >

[0060] <control-cue name="presetshortcut=3" value="0x70 0x72 0x65 0x73 0x650x74 0x73 0x68 0x6f 0x72 0x74 0x63 0x75 0x74 0x3d 0x33" / >

[0061] <control-cue name="presetshortcut=4" value="0x70 0x72 0x65 0x73 0x650x74 0x73 0x68 0x6f 0x72 0x74 0x63 0x75 0x74 0x3d 0x34" / >

[0062] <control-cue name="presetshortcut=5" value="0x70 0x72 0x65 0x73 0x650x74 0x73 0x68 0x6f 0x72 0x74 0x63 0x75 0x74 0x3d 0x35" / >

[0063] <control-cue name="presetshortcut=6" value="0x70 0x72 0x65 0x73 0x650x74 0x73 0x68 0x6f 0x72 0x74 0x63 0x75 0x74 0x3d 0x36" / >

[0064] <control-cue name="presetshortcut=7" value="0x70 0x72 0x65 0x73 0x650x74 0x73 0x68 0x6f 0x72 0x74 0x63 0x75 0x74 0x3d 0x37" / >

[0065] <control-cue name="presetshortcut=8" value="0x70 0x72 0x65 0x73 0x650x74 0x73 0x68 0x6f 0x72 0x74 0x63 0x75 0x74 0x3d 0x38" / >

[0066] <control-cue name="presetshortcut=9" value="0x70 0x72 0x65 0x73 0x650x74 0x73 0x68 0x6f 0x72 0x74 0x63 0x75 0x74 0x3d 0x39" / >

[0067] < / device>

[0068] LED controller sending card: adopts Novartis CY60, with firmware added to handle standby (eco=0) and wake-up (eco=1) logic processing. Its main function is command recognition and sending.

[0069] HUB Board: Employs the onboard LED controller receiver card CA50E, with an added control signal output interface. The output signal EN is output from the CA50E. The FPGA logic section of the CA50E includes control logic for the output signal EN.

[0070] Switching power supply: Megmeet MCP200WAT-4.0.

[0071] Test data and conclusions:

[0072] After setting up the entire system with standby functionality, simulate empty and inter-screen conditions, i.e., when the IMB stops the current projection (stop command), the LED movie screen displays a black screen. Use a power meter to record the power consumption for 1 hour each with standby enabled (standby command eco=0) and without standby functionality enabled, as shown in Table 1 below. After the measurement is completed, the IMB starts playing normally and issues a wake-up command (eco=1), and the entire screen returns to normal display within 1 second.

[0073] Table 1 Comparison of Battery Levels

[0074] CL-4k Single box black screen Estimated total of 96 boxes for the whole screen Do not turn on standby 0.034kw / h 3.264 kW / h Turn on standby 0.008kw / h 0.768kw / h

[0075] The above examples and test data demonstrate that LED cinema screens with standby functionality can save power consumption during empty screenings and breaks between screenings. Assuming a cinema is powered on at 9 AM and shows 6 movies daily, with an average of 3 hours of black-screen time per day (empty screenings + breaks between screenings), this standby energy-saving solution, compared to one without standby functionality, can save (3.264 - 0.768) * = 7.488 kW per day, approximately 2700 kWh per year. Therefore, this solution has considerable significance for energy saving and reducing cinema operating costs.

[0076] The present invention realizes the standby function in terms of energy saving, and proves its energy saving effect in the actual screening scenario of the cinema through examples and test data. The present invention has the following advantages: (1) Based on the characteristic that there are many non-screening periods in the cinema, the power consumption (black screen power consumption) is greatly reduced during non-screening periods. (2) Make full use of the existing communication lines of the LED cinema screen system. There is no need to add hardware boards and communication cables. Only the switching power supply is replaced, and the control terminals and additional controller (sending card, receiving card) logic of the HUB board are added, which is conducive to the upgrade of the existing LED cinema screen.

Claims

1. A power consumption management method for an LED cinema screen, characterized in that: All LED display panels of the LED cinema screen adopt a switching power supply with dual DC outputs and a control terminal EN. The switching power supply has two DC outputs, DCA and DCB. DCA supplies power to the LED display modules and is controlled by EN. DCB only supplies power to the receiving card of the LED display panel and is always effectively powered, but is not controlled by EN. The other outputs of the LED display panel are controlled by the control terminal EN. When the control terminal EN receives a "standby" or "wake-up" command, it controls DCA to power off or restore power.

2. The LED cinema screen power consumption management method according to claim 1, characterized in that: The IMB has two additional device commands: "standby" and "wake-up". These commands use TCP / IP packets and conform to the communication protocol with the LED cinema screen.

3. The LED cinema screen power consumption management method according to claim 2, characterized in that: In the backpack box of the LED cinema screen, the sending card responds to the "standby" and "wake-up" commands issued by the IMB and distributes them to all receiving cards inside the LED display screen through the internal communication channel.

4. The LED cinema screen power consumption management method according to claim 2, characterized in that: In the LED display cabinet of the LED cinema screen, after receiving a "standby" command, the receiving card sets the control signal to a low level to control the switching power supply to turn off the DCA output; after receiving a "wake-up" command distributed by the sending card, it sets the control signal to a high level to control the switching power supply to turn on the DCA output.

5. The LED cinema screen power consumption management method according to claim 1, characterized in that, Standby processing includes the following steps: S1: TMS determines whether the LED cinema screen is currently empty or in between screenings based on film schedule and ticketing system data; S2: TMS sends a signal to the backpack box of the LED cinema screen via Ethernet, controlling IMB to issue a "standby" device command; S3: After receiving the "standby" device instruction from IMB, the sending card distributes it to the receiving cards of all LED display screens that need to be in standby mode through the internal communication channel of the LED cinema screen. S4: The receiver card controls the switching power supply to shut off the DC power supply DCA to the LED display module via the control signal EN, thereby achieving standby mode.

6. The LED cinema screen power consumption management method according to claim 1, characterized in that, The recovery process includes the following steps: S11: TMS determines which LED movie screens need to be resumed playback based on the film schedule and ticketing system data; S12: TMS sends a signal to the backpack box of the LED cinema screen via Ethernet, controlling IMB to issue a "restore" device command; S3: After receiving the "restore" device instruction from IMB, the sending card distributes it to the receiving cards of all LED display screens that need to be restored through the internal communication channel of the LED cinema screen. S4: The receiver card controls the switching power supply to turn on the DC power supply DCA to the LED display module via the control signal EN, thereby achieving recovery.

7. The LED cinema screen power consumption management method according to claim 1, characterized in that: The DCA output power is 100-300W, and the DCB output power is 5-15W.

8. A power consumption management device for an LED cinema screen, characterized in that: The LED cinema screen includes an LED display body and a backpack box; the LED display body includes multiple unit boxes, each unit box including an LED display module, a switching power supply and a HUB board carrying an LED receiver card; the backpack box contains a cinema server IMB and a sending card with an LED controller. All unit cabinets of the LED display screen adopt a switching power supply with dual DC output and control terminal EN. The switching power supply has two DC outputs, DCA and DCB. DCA supplies the LED display module and is controlled by EN; DCB only supplies the receiving card of the LED display screen and is always effectively powered, and is not controlled by EN; when the control terminal EN receives a "standby" or "wake-up" command, it controls DCA to power off or restore.

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