An LED movie screen, a 3D movie system and a 3D movie playback method

Abstract

This invention discloses an LED cinema screen, a 3D cinema system, and a 3D cinema playback method. The LED cinema screen includes LED light boxes, with multiple LED light boxes stacked in a rectangular matrix. Each LED light box includes multiple LED light panels arranged in a matrix, and each LED light panel is equipped with a light panel control module, which is connected to a playback controller. Each LED light panel includes multiple LED beads arranged in a matrix and multiple infrared signal transmitters arranged in a matrix, with the infrared signal transmitters positioned between adjacent LED beads. The infrared signal transmitters and LED beads are connected to the light panel control module. This invention's LED cinema screen ensures that infrared signals are evenly distributed and emitted directly from the front of the LED cinema screen to the viewing platform, eliminating blind spots and ensuring consistent signal reception at any position, thus guaranteeing excellent image playback quality.

Description

Technical Field

[0001] This invention relates to an LED movie screen, a 3D movie system, and a 3D movie playback method for use in cinemas, and belongs to the field of 3D movie playback technology. Background Technology

[0002] In recent years, with the popularization of LED cinema screens, 3D stereoscopic movies have become a craze. Currently, the playback methods used in 3D stereoscopic movies are mainly divided into two types: active and passive. Passive playback uses very simple 3D glasses, which only have a polarizing filter. During playback, the 3D glasses rely on the polarizing filter to filter out only the light displayed at a specific polarization angle, thus obtaining a complete picture effect. This passive playback method is simple and practical, but the picture quality is poor and cannot meet the increasingly sophisticated viewing demands. In contrast, active playback mainly relies on an electronic device called a "shutter" installed on the 3D glasses to switch the left and right eye images during playback. Its picture quality is good, but it has problems such as difficult installation and maintenance, and signal delays that can cause crosstalk between the left and right eye images, which can significantly impact the operation of LED cinemas.

[0003] A 3D movie system employing active playback primarily includes an LED movie screen 90, a signal processor 92, an infrared (radio frequency) signal transmitter 91, a playback controller 93, and 3D glasses. For example... Figure 1 and Figure 2 The LED cinema screen 90 is composed of multiple LED light panels 94. Each LED light panel 94 includes multiple LED beads, and each LED light panel 94 is equipped with a control box for driving and controlling the on / off state of the LED beads. The control boxes of each LED light panel 94 are connected to a playback controller 93 for controlling the playback of the image. To avoid obstruction, multiple infrared signal transmitters 91 are symmetrically and horizontally distributed along the width of the LED cinema screen 90 at its top. To cover the entire area without any blind spots, 2-4 transmitters are typically evenly distributed. The playback controller 93 is connected to each infrared signal transmitter 91 via a signal processor 92. The signal processor 92 is used for signal synchronization; specifically, it synchronizes the signals emitted by the infrared signal transmitters 91 (used to activate the "shutter" on the 3D glasses for switching between the left and right eye images) with the playback signals (on / off states) of each LED light panel of the LED cinema screen 90. For ease of later parameter setting and maintenance, the signal processor 92 and the playback controller 93 are generally installed at the bottom of one side of the LED cinema screen 90.

[0004] Actual playback reveals the following drawbacks of the aforementioned 3D movie system: First, for medium to large-sized LED cinemas, the width of the LED movie screen 90 can reach 20 meters. Therefore, the cable connecting the signal processor 92 and the infrared signal transmitter 91 will exceed 30 meters in length. Typically, cables exceeding 20 meters suffer from severe signal delay and attenuation. Thus, even if the signal processor 92 synchronizes the signal emitted by the infrared signal transmitter 91 based on the playback signal output from the playback controller 93, the excessive cable length will still cause severe signal delay and instability, leading to crosstalk between the left and right eyes. Second, the signal processor 92 typically requires a separate power supply and a special cable connection to the playback controller 93. It also requires separate settings for the playback frame rate (which varies depending on the movie format, such as 24, 48, 96, or 120 frames per second), black screen time, and delay time to maintain synchronization with the playback controller 93. This demonstrates the complexity, difficulty, and high cost of implementation. Third, the infrared signal transmitter 91 is located on top of the LED movie screen 90, making installation and subsequent maintenance inconvenient. Fourth, during actual playback, if... Figure 1 The infrared signal transmitter 91 needs to cover both the front and back rows of the viewing platform 95, which has a large span. The signal reception at the corners of the viewing platform 95 is poor. In addition, if one of the infrared signal transmitters 91 malfunctions, it will greatly affect the signal reception and make it impossible to guarantee the viewing experience. Summary of the Invention

[0005] The purpose of this invention is to provide an LED movie screen, a 3D movie system, and a 3D movie playback method. This LED movie screen enables infrared signals to be evenly distributed and emitted directly from the front of the LED movie screen to the viewing platform, with no blind spots and consistent signal reception at any position, ensuring a good picture playback effect.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An LED cinema screen includes LED light boxes, with multiple LED light boxes stacked in a matrix to form a rectangular shape. Each LED light box includes multiple LED light panels arranged in a matrix, and each LED light panel is equipped with a light panel control module. Each light panel control module is connected to a playback controller. Each LED light panel includes multiple LED beads arranged in a matrix and multiple infrared signal transmitters arranged in a matrix. The infrared signal transmitters are located between adjacent LED beads. The infrared signal transmitters and LED beads are connected to the light panel control module. The light panel control module is used to control the infrared signal transmitters to emit infrared signals when the left and right eye images are switched using the black screen time between the left and right eye images, thereby triggering 3D glasses switching.

[0008] Preferably, for the LED light panel, the number of rows of infrared signal transmitters is not less than 2 and the number of transmitters in each row is not less than 2, and the number of LED beads is much greater than the number of infrared signal transmitters.

[0009] Preferably, the LED beads are disposed on the LED bead mounting frame, the LED light board is formed by splicing together multiple LED bead mounting frames, and the infrared signal transmitter is located at the intersection of the four corners of four adjacent LED bead mounting frames, wherein the LED bead mounting frame is provided with a groove for accommodating the infrared signal transmitter.

[0010] Preferably, the lamp panel control module includes a central processing unit, a display driving circuit, and an infrared emission driving circuit. The central processing unit is connected to the playback controller, the central processing unit is connected to the LED beads via the display driving circuit, and the central processing unit is connected to the infrared signal transmitter via the infrared emission driving circuit.

[0011] Preferably, the lamp panel control module further includes a power distribution circuit, which is connected to an external power control box and supplies power to the central processing unit, the LED beads, and the infrared signal transmitter.

[0012] A 3D movie system includes the aforementioned LED movie screen, the playback controller, and 3D glasses for viewers to wear, wherein the playback controller is located at the bottom of one side of the LED movie screen.

[0013] Preferably, the 3D glasses include a frame with two liquid crystal lenses embedded in it. A circuit board is installed in the middle of the frame, and an infrared signal receiver is provided above the circuit board. The infrared signal receiver is connected to the circuit board, and the circuit board is connected to the two liquid crystal lenses.

[0014] A 3D movie playback method, implemented based on the aforementioned 3D movie system, wherein the playback controller sends left and right eye image playback commands to each of the light panel control modules, the light panel control modules drive the LED beads to play the left and right eye images, and during the black screen time between the left and right eye images, drive the infrared signal transmitter to emit infrared signals to the viewing platform, thereby triggering the 3D glasses worn by the audience on the viewing platform to switch the liquid crystal display state of the liquid crystal lenses, thus enabling the 3D glasses to switch synchronously with the LED light panels.

[0015] The advantages of this invention are:

[0016] 1. The infrared signal transmitters in this invention are evenly distributed across the entire LED movie screen. All the emitted infrared signals are horizontally directed from the front of the movie screen to the viewing platform, with no blind spots. The signal reception effect is good and consistent at any position on the viewing platform.

[0017] 2. The LED cinema screen of the present invention can be simply spliced ​​and stacked, without the need to install other equipment separately at the top of the cinema screen. Installation and subsequent maintenance are convenient. All equipment is powered by a unified power supply, without the need for special cable connections or additional parameter settings. It is easy to implement, energy-saving and cost-effective.

[0018] 3. This invention incorporates numerous infrared signal transmitters, providing redundancy among them. Even if individual infrared signal transmitters malfunction, the overall signal reception will not be affected, ensuring a high-quality playback experience.

[0019] 4. The method of the present invention utilizes the blackout time that exists when the left and right eye images switch to emit infrared signals to trigger the 3D glasses to switch. That is, the emitted infrared signals are directly synchronization signals, without the need for synchronization processing by means of a signal processor, and there is no problem of signal attenuation and delay caused by excessive cable length. This ensures that the 3D glasses image switching is always synchronized with the left and right eye image switching, and completely avoids the problem of crosstalk between the left and right eye images. Attached Figure Description

[0020] Figure 1 This is a schematic diagram illustrating the active playback method of an existing LED movie screen.

[0021] Figure 2 This is a schematic diagram of an existing LED cinema screen.

[0022] Figure 3 This is a schematic diagram illustrating the playback of the LED movie screen of the present invention.

[0023] Figure 4 This is a front view schematic diagram of the LED cinema screen of the present invention.

[0024] Figure 5 This is a schematic diagram of the structure of an LED light panel.

[0025] Figure 6 This is a schematic diagram of the lamp control module.

[0026] Figure 7 This is a schematic diagram of 3D glasses.

[0027] Figure 8 This is an illustrative diagram illustrating the 3D movie playback method of the present invention. Detailed Implementation

[0028] like Figures 3 to 8 As shown, this invention proposes an LED movie screen 10, including an LED light box 20. Multiple LED light boxes 20 are stacked in a matrix in a rectangular shape. Each LED light box 20 includes multiple LED light panels 30 arranged in a matrix. Each LED light panel 30 is equipped with a light panel control module 50, which is typically located within a control box. Each light panel control module 50 is connected to a playback controller 60 via cables. Each LED light panel 30 includes multiple LED beads 31 arranged in a matrix and multiple infrared (radio frequency) signal transmitters 32 arranged in a matrix. The infrared signal transmitters 32 are positioned between adjacent LED beads 31. The number of infrared signal transmitters is much greater than the number of infrared signal transmitters 32. The infrared signal transmitters 32 and LED beads 31 are connected to the lamp board control module 50. The lamp board control module 50 is used to control the infrared signal transmitters 32 to emit infrared signals when the left and right eye images are switched by the LED beads 31, using the black time between the left and right eye images. This triggers the 3D glasses 80 to switch the liquid crystal display state of its liquid crystal lens 81 (that is, switch the state of the liquid crystal transmitting light). In other words, the switching time of the 3D glasses 80 is synchronized with the switching time of the left and right eye images of the LED lamp board 30 (or the entire LED movie screen 10), so that the human eye sees a continuous picture effect without any abrupt picture "switching".

[0029] For the LED light panel 30, the number of rows of infrared signal transmitters 32 is not less than 2 and the number of transmitters in each row is not less than 2, that is, it is arranged in a regular 2×2 matrix. The number of LED beads 31 is much greater than the number of infrared signal transmitters 32.

[0030] Similarly, in this invention, the LED light box 20, LED light board 30, and LED beads 31 are arranged in no less than 2 rows, and the number of each row is no less than 2.

[0031] In the actual design, the LED beads 31 are mounted on the bead mounting frame 33. The LED light board 30 is formed by splicing multiple bead mounting frames 33. The infrared signal transmitter 32 is preferably located at the intersection of the four corners of four adjacent bead mounting frames 33 (not limited). The bead mounting frame 33 is provided with a groove for accommodating the infrared signal transmitter 32 (not shown in the figure). In actual installation, the infrared signal transmitter 32 is embedded at the intersection of the four corners of four adjacent bead mounting frames 33.

[0032] like Figure 5 The figure shows an LED light panel 30 formed by splicing together 8×12 LED bead mounting frames 33 and arranging 3×5 infrared signal transmitters 32. Typically, the LED beads 31 are located in the center of the LED bead mounting frames 33, and the infrared signal transmitters 32 are arranged alternately. Furthermore, Figure 4 The diagram shows an LED movie screen 10 consisting of 9×10 LED light boxes 20 stacked and fixed in a regular pattern. The entire playback surface formed by the LED movie screen 10 is rectangular. Additionally, Figure 4 An example is shown where an LED light box 20 is formed by splicing together 2×2 LED light panels 30. Of course, the arrangement and number of LED light boxes 20, LED light panels 30, LED bead mounting frames 33 (or LED beads 31) and infrared signal transmitters 32 are not limited as described above.

[0033] For example, a standard LED cinema screen 10 with a width of 16 meters is formed by 144 LED light boxes 20 stacked and fixed in a regular pattern. Considering production, installation, and cost control, the luminous surface of each LED light box 20 is generally designed to be 0.5-1 square meters. Each LED light box 20 is equipped with 4 LED light panels 30, and the entire screen has a total of 576 LED light panels 30. Each LED light panel 30 has 3×5 infrared signal transmitters 32 evenly distributed, thus achieving nearly 10,000 infrared signal emission points. Figure 4 The height and width of the LED cinema screen 10 are shown.

[0034] For each LED panel 30, such as Figure 6 The lamp panel control module 50 includes a central processing unit 51, a display driving circuit 52, and an infrared emitting driving circuit 53. The central processing unit 51 is connected to the playback controller 60, the central processing unit 51 is connected to the LED beads 31 via the display driving circuit 52, and the central processing unit 51 is connected to the infrared signal transmitter 32 via the infrared emitting driving circuit 53.

[0035] The lamp control module 50 also includes a power distribution circuit 55, which is connected to an external power control box 70. The power distribution circuit 55 supplies power to the central processing unit 51, LED beads 31 and infrared signal transmitter 32.

[0036] In addition, the lamp control module 50 may also include signal status indicator lights 54, which are connected to the central processing unit 51, and the power distribution circuit 55 supplies power to the signal status indicator lights 54. There can be multiple signal status indicator lights 54, used to indicate the working status of the LED beads 31 and the infrared signal transmitter 32, without limitation.

[0037] In this invention, the display driving circuit 52 and the infrared emission driving circuit 53 include an LED matrix driver, such as an LED matrix driver of model LP5890.

[0038] To accelerate the response speed of the LED bead 31 and the infrared signal transmitter 32 and improve the synchronization effect, the LED bead 31 and the infrared signal transmitter 32 are always powered. When the LED bead 31 needs to be turned on, the display driver circuit 52 inputs a driving signal to the LED bead 31 (that is, a certain driving voltage is applied to the LED bead 31, which is much smaller than the power supply voltage, so that the LED bead 31 works at the current voltage (power supply voltage plus driving voltage) as soon as the driving voltage is applied to the LED bead 31), and the LED bead 31 lights up; conversely, the LED bead 31 turns off. When the infrared signal transmitter 32 needs to be turned on, the infrared signal transmitter 32 is driven by the infrared emission drive circuit 53 (that is, a certain drive voltage is applied to the infrared signal transmitter 32, the drive voltage is much smaller than the power supply voltage, so that the infrared signal transmitter 32 will work under the current voltage (power supply voltage plus drive voltage) as soon as the drive voltage is applied to the infrared signal transmitter 32). Then the infrared signal transmitter 32 emits infrared signals. Otherwise, the infrared signal transmitter 32 does not emit infrared signals.

[0039] The power distribution circuit 55 is mainly used to convert the voltage input from the power control box 70 to AC / DC and transform the voltage magnitude before outputting it to the corresponding devices. The power control box 70 is mainly used to provide power to external devices. The power distribution circuit 55 and the power control box 70 are well-known technologies in the art and will not be described in detail here.

[0040] The central processing unit 51, LED beads 31, and infrared signal transmitter 32 are existing devices in this field, and therefore will not be described in detail here.

[0041] The present invention also proposes a 3D movie system, including the LED movie screen 10, playback controller 60 and 3D glasses 80 for the audience to wear, wherein the playback controller 60 is located at the bottom of one side of the LED movie screen 10.

[0042] like Figure 7The 3D glasses 80 includes a frame with two liquid crystal lenses 81 embedded in it. A circuit board 82 is installed in the middle of the frame, and an infrared signal receiver 83 is located above the circuit board 82. The infrared signal receiver 83 is connected to the circuit board 82, and the circuit board 82 is connected to the two liquid crystal lenses 81.

[0043] In this invention, the playback controller 60 and the 3D glasses 80 are existing devices or components in LED cinemas. The playback controller 60 is primarily used to control the playback of images for the left and right eyes.

[0044] For the 3D glasses 80, the infrared signal receiver 83 receives the infrared signal emitted by the infrared signal transmitter 32. Upon receiving the infrared signal, the infrared signal receiver 83 sends feedback to the circuit board 82, causing the circuit board 82 to control the liquid crystal lens 81 to switch states, i.e., to control whether the liquid crystal display state of the liquid crystal lens 81 switches. In actual implementation, each liquid crystal lens 81 adjusts its liquid crystal properties to control the light transmittance (e.g., light-transmitting or opaque), thus allowing the eyes to see different images (left-eye or right-eye image).

[0045] Based on the above design, each LED bead 31 is evenly distributed across the entire LED cinema screen 10. Each infrared signal transmitter 32 is located on the LED light panel 30, distributed among the LED beads 31, and is also evenly distributed across the entire LED cinema screen 10. In this way, the infrared signal transmitters 32 are directly facing the viewing platform 40, and the infrared signals emitted by each infrared signal transmitter 32 are horizontally emitted from the front of the LED cinema screen 10 to the viewing platform 40, thus covering the entire area of ​​the viewing platform 40. The system is large in scale, numerous, and has a strong signal with no blind spots. The infrared signal receivers 83 on the 3D glasses 80 worn by viewers sitting in any position on the viewing platform 40 can receive signals with consistent performance.

[0046] This invention also proposes a 3D movie playback method, implemented based on the 3D movie system of this invention. The playback controller 60 sends left and right eye image playback commands to each lamp panel control module 50. The lamp panel control module 50 drives LED beads 31 to play the left and right eye images. During the blackout period between the left and right eye images, the infrared signal transmitter 32 transmits infrared signals to the viewing platform 40, triggering the 3D glasses worn by the audience on the viewing platform 40 to switch the liquid crystal display state of the liquid crystal lenses. This ensures that the 3D glasses and the LED lamp panel 30 (or the entire LED movie screen 10) switch synchronously (considered as synchronous switching), improving the viewing experience.

[0047] In the field of 3D playback, to avoid crosstalk between the left and right eye images, a brief pause, known as a "blackout," is typically added between the left and right eye images. 3D movie images are composed of alternating left and right eye images. In this invention, the left eye image refers to a positive pulse (one frame), and similarly, the right eye image refers to a negative pulse (one frame). For example... Figure 8 As shown, positive pulses above line L represent multiple frames of left-eye images played at intervals, while negative pulses below line L represent multiple frames of right-eye images played at intervals. Typically, a minimum of 48 frames per second are displayed, with 24 frames for each eye. There is a blackout period between adjacent left-eye and right-eye images.

[0048] Therefore, this invention utilizes the existing black screen time setting in the art to achieve signal synchronization, specifically:

[0049] When playing a 3D movie, the playback controller 60 continuously and alternately outputs the left-eye and right-eye images. During playback, the central processing unit 51 applies a driving signal to the corresponding LED beads 31 through the display driving circuit 52, so that the corresponding LED beads 31 light up, realizing the playback of the left-eye or right-eye image.

[0050] To avoid crosstalk between the left and right eyes caused by rapid switching between images, a black screen interval is added between each frame. Figure 8 During blackout periods, the central processing unit 51 stops applying drive signals to the LED beads 31 via the display drive circuit 52, so the LED beads 31 do not emit light. Simultaneously, the central processing unit 51 applies drive signals to the infrared signal transmitter 32 via the infrared emission drive circuit 53, causing the infrared signal transmitter 32 to operate and emit infrared (radio frequency) signals (the infrared signals are encoded to determine the current state). When the infrared signal is captured by the infrared signal receiver 83 on the 3D glasses 80, the circuit board 82 on the 3D glasses 80 controls the two liquid crystal lenses 81 to switch states, that is, the liquid crystals on the liquid crystal lenses 81 switch from one display state to another (the two display states are opposite), thus completing the conversion of image reception for both eyes. By continuously playing the left and right eye images in this cycle, a complete 3D movie effect can be achieved by relying on the visual difference between the left and right eyes.

[0051] Furthermore, during the current movie playback, if the previous frame outputs the left-eye view, then during the subsequent blackout period, LED beads 31 turn off, infrared signal transmitter 32 turns on, and transmits a synchronization signal (coded as left off, right on). This synchronization signal is received by the infrared signal receiver 83 on the 3D glasses 80. The circuit board 82 then compares the current display state of the liquid crystal lens 81 with the decoded information. For example, if the current display state of the liquid crystal lens 81 is left-eye on and right-eye off (left on, right off), then the circuit board 82 triggers the current liquid crystal lens 81 to switch, and the liquid crystals of each lens 81 change to the opposite display state.

[0052] If the 3D glasses 80 are activated for the first time during the movie screening and the display state of the liquid crystal lens 81 is that the right eye is open and the left eye is closed (left closed and right open), then it is usually set to not switch when the infrared signal is received for the first time, based on the rule of the playback order of the left and right eye images of the movie. Instead, it waits for the next infrared signal (synchronization signal) to be received to make a judgment, and then determines whether to switch based on the judgment result.

[0053] The advantages of this invention are:

[0054] This invention relates to an LED cinema screen used in an active playback mode. Infrared signals are evenly distributed and emitted directly from the front of the LED cinema screen to the viewing platform, with no blind spots. The signal reception effect is consistent at any position, ensuring the picture playback effect. It is convenient to install and maintain, low in cost, and suitable for widespread promotion.

[0055] The above description describes the preferred embodiments of the present invention and the technical principles applied thereto. For those skilled in the art, any obvious changes such as equivalent transformations or simple substitutions based on the technical solutions of the present invention, without departing from the spirit and scope of the present invention, shall fall within the protection scope of the present invention.

Claims

1. An LED movie screen, characterized by, The system includes LED light boxes, with multiple LED light boxes stacked in a matrix to form a rectangular shape. Each LED light box comprises multiple LED light panels arranged in a matrix, and each LED light panel is equipped with a light panel control module. Each light panel control module is connected to a playback controller. Each LED light panel includes multiple LED beads arranged in a matrix and multiple infrared signal transmitters arranged in a matrix. The infrared signal transmitters are positioned between adjacent LED beads. The infrared signal transmitters and LED beads are connected to the light panel control module. The light panel control module is used to control the infrared signal transmitters to emit infrared signals when the left and right eye images are switched using the LED beads, utilizing the blackout time between the left and right eye images to trigger the 3D glasses to switch.

2. The LED movie screen of claim 1, wherein, For the LED light panel, the number of rows of infrared signal transmitters is not less than 2 and the number of transmitters in each row is not less than 2. The number of LED beads is much greater than the number of infrared signal transmitters.

3. The LED movie screen of claim 2, wherein, The LED beads are mounted on the bead mounting frame. The LED light board is formed by splicing together multiple bead mounting frames. The infrared signal transmitter is located at the intersection of the four corners of four adjacent bead mounting frames. The bead mounting frame is provided with a groove for accommodating the infrared signal transmitter.

4. The LED movie screen of claim 1 or 2 or 3, wherein, The lamp panel control module includes a central processing unit, a display driving circuit, and an infrared emission driving circuit. The central processing unit is connected to the playback controller, the central processing unit is connected to the LED beads via the display driving circuit, and the central processing unit is connected to the infrared signal transmitter via the infrared emission driving circuit.

5. The LED movie screen of claim 4, wherein, The lamp panel control module also includes a power distribution circuit, which is connected to an external power control box and supplies power to the central processing unit, the LED beads, and the infrared signal transmitter.

6. A 3D movie system characterized by, The device includes an LED cinema screen as described in any one of claims 1 to 5, the playback controller, and 3D glasses for the audience to wear, wherein the playback controller is located at the bottom of one side of the LED cinema screen.

7. The 3D movie system of claim 6, wherein, The 3D glasses include a frame with two liquid crystal lenses embedded in it. A circuit board is installed in the middle of the frame, and an infrared signal receiver is located above the circuit board. The infrared signal receiver is connected to the circuit board, and the circuit board is connected to the two liquid crystal lenses.

8. A method for playing 3D movies, implemented based on the 3D movie system of claim 6, characterized in that, The playback controller sends left and right eye image playback commands to each of the light panel control modules. The light panel control modules drive the LED beads to play the left and right eye images. During the blackout period between the left and right eye images, the infrared signal transmitter is driven to emit infrared signals to the viewing platform, so that the 3D glasses worn by the audience on the viewing platform are triggered to switch the liquid crystal display state of the liquid crystal lens, thereby keeping the 3D glasses and the LED light panels switching synchronously.

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