A projector control circuit

Abstract

This utility model relates to a projector control circuit, which includes an LED driver module, a parsing module, a decoupling module, and a filtering module. The parsing module analyzes the video or image content being played and transmits the image change signals to the LED driver module. The LED driver module drives RGB LEDs to produce corresponding colors. The decoupling module decouples the voltage supplied to the LED driver module, and the filtering module filters the signals from the LED driver module that drive the RGB LEDs. This utility model, through real-time analysis of the video or image content by the parsing module, can accurately capture image color, brightness, and scene change signals and transmit these image change signals to the LED driver module in real time. The LED driver module dynamically adjusts the brightness and color combination of the RGB LEDs according to the signals, ensuring high synchronization between ambient light and the projected image.

Description

Technical Field

[0001] This utility model relates to the field of projector control technology, and in particular to a projector control circuit. Background Technology

[0002] With the continuous development of display technology, projectors, as an important display device, have been widely used in various fields such as home entertainment, business presentations, and educational lectures. Traditional projector technology mainly focuses on how to decode and convert input video or image content into a high-quality projected image through efficient optical systems and image processing algorithms. Specifically, existing projector technology typically includes the following steps: First, the input video or image content is decoded; then, the decoded signal is converted into LVDS (Low Voltage Differential Signaling) format and initially displayed on a screen; finally, the image on the screen is magnified and projected onto an external screen using a projection lens, thus forming a large-size image for viewers to view.

[0003] However, despite significant advancements in image quality, traditional projector technology still suffers from a notable limitation: projectors cannot adjust and change the ambient lighting in real time according to the content being displayed. When watching movies, playing games, or engaging in other multimedia activities, users often expect a more immersive and engaging experience where ambient lighting is closely synchronized with the dynamic changes in the on-screen content, creating vibrant visual effects. For example, during a spectacular fireworks display, users might desire that the ambient light changes color in sync with the fireworks, enhancing the overall viewing experience.

[0004] Unfortunately, current projector technology cannot meet this requirement. Because projectors primarily focus on displaying the image itself and neglect interaction with ambient light, users often need to configure additional lighting systems to simulate or enhance this effect. This not only increases the cost and complexity of use but also makes it difficult to achieve precise synchronization and dynamic changes between lighting effects and image content. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a projector control circuit.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A projector control circuit includes an LED driver module, a parsing module, a decoupling module, and a filtering module. The parsing module is used to parse the video or screen content being played in real time and transmit the screen change signal to the LED driver module. The LED driver module is used to drive RGB LEDs to produce corresponding colors according to the screen change signal. The decoupling module is used to decouple the voltage supplied to the LED driver module. The filtering module is used to filter the signal from the LED driver module that drives the RGB LEDs.

[0008] In one specific embodiment, the control circuit further includes a pull-up module, which is used to pull up the voltage so that the parsing module obtains a high-level signal.

[0009] In one specific embodiment, the parsing module includes a controller chip U2, and pins 1 and 2 of the controller chip U2 are connected to the LED driver module and the pull-up module.

[0010] In one specific embodiment, the LED driving module includes a driving chip U1, pin 19 of the driving chip U1 is connected to pin 1 of the controller chip U2, pin 18 of the driving chip U1 is connected to pin 2 of the controller chip U2, and pin 20 of the driving chip U1 is connected to the decoupling module.

[0011] In one specific embodiment, the LED driving module further includes a resistor R3, one end of which is connected to pin 15 of the driving chip U1, and the other end is grounded.

[0012] In one specific embodiment, the decoupling module includes capacitor C1 and capacitor C2, one end of which is connected to pin 20 of the driver chip U1, and the other end is grounded.

[0013] In one specific embodiment, the filtering module includes capacitors C3, C4, and C5. One end of capacitor C3 is connected to pin 13 of the driver chip U1, and the other end is grounded. One end of capacitor C4 is connected to pin 12 of the driver chip U1, and the other end is grounded. One end of capacitor C5 is connected to pin 11 of the driver chip U1, and the other end is grounded.

[0014] In one specific embodiment, the pull-up module includes resistor R1 and resistor R2, wherein resistor R1 is connected to pin 1 of the controller chip U2 and resistor R2 is connected to pin 2 of the controller chip U2.

[0015] In one specific embodiment, the controller chip U2 is model MT9266.

[0016] In one specific embodiment, the driver chip U1 is model PCA9634PW.

[0017] The advantages of this invention compared to existing technologies are as follows: By analyzing the video or image content in real time through the analysis module, it can accurately capture the color, brightness, and scene change signals of the image and transmit these image change signals to the LED driver module in real time. The LED driver module dynamically adjusts the brightness and color combination of the RGB LEDs according to the signals, so that the ambient light and the projected image are highly synchronized. This dynamic light matching breaks the limitation of the traditional projector's "disconnect between image and environment" and brings users an immersive experience. In addition, the decoupling module filters the voltage supplied to the LED driver module, effectively eliminating power supply noise and transient interference, and ensuring that the LED driver module obtains a stable power supply voltage. At the same time, the filtering module further smooths the LED driver signal, reducing signal jitter and glitches, and avoiding LED flicker or color distortion caused by voltage fluctuations or signal interference. This design improves the accuracy and response speed of light control, making changes in ambient light smoother and more natural.

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic block diagram of the projector control circuit provided by this utility model;

[0021] Figure 2 A schematic diagram of the circuit principle of the projector control circuit provided by this utility model. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0024] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0026] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0029] Please see Figure 1 , Figure 1 The schematic block diagram of the projector control circuit provided in this embodiment of the utility model includes: an LED driving module 10, a parsing module 20, a decoupling module 30, and a filtering module 40. The parsing module 20 is used to parse the video or screen content being played in real time and transmit the screen change signal to the LED driving module 10. The LED driving module 10 is used to drive RGB LEDs to produce corresponding colors according to the screen change signal. The decoupling module 30 is used to decouple the voltage supplied to the LED driving module 10. The filtering module 40 is used to filter the signal from the LED driving module 10 that drives the RGB LEDs.

[0030] Specifically, the analysis module 20 employs a high-performance Scaler IC (image scaling controller chip), which receives video or image signals input from the projector in real time via interfaces such as HDMI and DP. This chip has a built-in video decoder capable of analyzing high-definition content such as 4K / HDR, extracting color parameters (such as RGB values), brightness changes, and scene switching information from the image. The analyzed data is transmitted to the LED driver module 10 in digital signal form via the I2C bus. The LED driver module 10 supports 8-channel PWM output (2 channels for each of the three RGB colors + 1 spare), with an adjustable drive current range of 0-120mA. After receiving signals from the analysis module 20 via the I2C interface, the driver module converts the digital commands into PWM duty cycles (0%-100%), directly controlling the brightness of the RGB LEDs. For example, when the analysis module 20 detects an increase in the proportion of red in the image, the driver module increases the PWM duty cycle of the R channel while decreasing the G / B channels to maintain color purity. The decoupling module 30 consists of ceramic capacitors connected in parallel to the power input of the LED driver module 10. The capacitors are made of X7R material, which can filter out power supply noise in the 100Hz-10MHz frequency band. The filter module 40 is connected in series between the PWM output terminal of the LED driver module 10 and the RGB LED, which can attenuate high-frequency harmonics (>1.6kHz) in the PWM signal, while retaining the fundamental component of 0-1.6kHz, ensuring that the LED light changes smoothly without jagged edges.

[0031] In other words, by analyzing the video or image content in real time through the analysis module 20, the color, brightness, and scene change signals of the image can be accurately captured, and these image change signals are transmitted to the LED driver module 10 in real time. The LED driver module 10 dynamically adjusts the brightness and color combination of the RGB LEDs according to the signals, so that the ambient light is highly synchronized with the projected image. For example, when playing a fireworks scene, the RGB LEDs can quickly switch to warm tones and simulate explosion light effects; in a deep-sea scene, a cool tone gradient is used to create an underwater atmosphere. This dynamic light matching completely breaks the limitation of the traditional projector's "disconnect between image and environment", bringing users an immersive experience. In addition, the decoupling module 30 filters the voltage supplied to the LED driver module 10, effectively eliminating power supply noise and transient interference, ensuring that the LED driver module 10 obtains a stable power supply voltage; at the same time, the filtering module 40 further smooths the LED drive signal, reducing signal jitter and glitches, and avoiding LED flickering or color distortion caused by voltage fluctuations or signal interference. This design improves the accuracy and response speed of light control, making changes in ambient light smoother and more natural. Furthermore, this technical solution can be widely applied in home theaters, commercial displays, virtual reality, and other fields, and is especially suitable for scenarios with high requirements for immersive experiences. Through the deep integration of hardware modules and software algorithms, it provides the projection industry with a standardized solution for dual-dimensional control of "image + light," and is expected to drive the entire display technology towards a more intelligent and interactive direction.

[0032] Please see Figure 1 and Figure 2 As shown, in one embodiment, the control circuit further includes a pull-up module 50, which is used to pull up the voltage so that the parsing module 20 obtains a high-level signal.

[0033] Specifically, when the I2C bus is idle, the pull-up module 50 pulls the SDA / SCL lines of the parsing module 20 to a high level (VDD); when the parsing module 20 or the LED driver module 10 actively pulls the signal lines low, the voltage is turned to ground through the internal MOSFET, forming a low level. The pull-up module 50 provides a stable high-level current for the bus, ensuring that the signal can maintain a clear distinction between high and low levels even during long-distance transmission (e.g., >1m) or when there are multiple device loads (e.g., cascaded multiple driver chips).

[0034] In other words, the pull-up module 50 fixes the bus default state to a high level, effectively suppressing false triggering caused by external electromagnetic interference (EMI) or power fluctuations. Furthermore, it avoids uncertain levels caused by a floating bus, ensuring that the parsing module 20 can reliably receive feedback signals from the LED driver module 10 even in low-power mode. Additionally, the pull-up module 50 provides sufficient pull-up current to the bus, reducing data transmission error rates.

[0035] Please see Figure 1 and Figure 2 As shown, in one embodiment, the parsing module 20 includes a controller chip U2, and pins 1 and 2 of the controller chip U2 are connected to the LED driver module 10 and the pull-up module 50.

[0036] Specifically, pin 1 (SDA) of controller chip U2 is the I2C bus data signal line, which transmits bidirectional image change data to LED driver module 10. Pin 2 (SCL) of controller chip U2 is the I2C bus clock signal line, which provides a synchronization clock to LED driver module 10. When the bus is idle, pull-up module 50 pulls SDA / SCL to a high level of 3.3V to prevent level drift caused by floating.

[0037] Please see Figure 1 and Figure 2 As shown, in one embodiment, the LED driving module 10 includes a driving chip U1, pin 19 of the driving chip U1 is connected to pin 1 of the controller chip U2, pin 18 of the driving chip U1 is connected to pin 2 of the controller chip U2, and pin 20 of the driving chip U1 is connected to the decoupling module 30.

[0038] Specifically, pin 19 of driver chip U1 is an I2C bus data signal line, communicating bidirectionally with pin 1 (SDA) of controller chip U2 to transmit image color parameters (such as RGB values). Pin 18 of driver chip U1 is an I2C bus clock signal line, receiving the synchronous clock output from pin 2 (SCL) of controller chip U2 to ensure data transmission timing alignment. Pin 20 (VDD) of driver chip U1 is a power input pin, connected to decoupling module 30 to filter power supply noise. Controller chip U2 analyzes the video image in real time, extracting RGB color parameters and brightness changes, and sends them to driver chip U1 via the I2C bus in 8-bit format (such as "0xRRGGBB"). Driver chip U1 latches the SDA data on the rising edge of the SCL clock and stores it in an internal register (such as a PWM control register). Driver chip U1 adjusts the PWM duty cycle (16-bit precision) according to the received data to drive the external RGB LED strip to achieve gradual brightness changes (such as a 0%-100% dimming range). The decoupling module 30 filters out high-frequency noise (100kHz-10MHz) and low-frequency noise (100Hz-1kHz), ensuring that VDD voltage fluctuation is <50mV. In addition, the DGND pin of the driver chip U1 is connected to the power supply ground through a single point to avoid forming a loop with the analog ground (AGND) and reduce common-mode interference.

[0039] Please see Figure 1 and Figure 2As shown, in one embodiment, the LED driving module 10 further includes a resistor R3, one end of which is connected to pin 15 of the driving chip U1, and the other end is grounded.

[0040] Specifically, one end of resistor R3 is directly soldered to pin 15 of driver chip U1, which is the output enable terminal; the other end is connected to digital ground (DGND). Pin 15 of driver chip U1 is an active low-level enable terminal (OE). When resistor R3 pulls pin 15 low to ground potential (0V), the internal drive circuit of driver chip U1 is activated, allowing the PWM signal to be output to the RGB LED strip. If pin 15 of driver chip U1 is left floating or connected to a high level (>2V), driver chip U1 enters a low-power sleep mode, the PWM output is turned off, and the LED strip is turned off. Resistor R3 provides a stable ground path, ensuring that the voltage fluctuation of pin 15 of driver chip U1 is <50mV, avoiding false triggering of driver chip U1 due to noise (such as unexpected wake-up from sleep mode).

[0041] In other words, the pull-down resistor R3 ensures that the switching time of pin 15 of the driver chip U1 is less than 50ns (from high level 3.3V to low level 0V), guaranteeing that the driver chip U1 completes mode switching (activation / sleep) in a short time to meet the requirements of real-time iridescent effects. When resistor R3 pulls pin 15 of the driver chip U1 low, the sleep mode current of the driver chip U1 decreases, reducing standby power consumption. In addition, during iridescent scene switching (such as switching from video playback to standby), resistor R3 ensures that the driver chip U1 quickly enters sleep mode, preventing abnormal lighting of the LED strip.

[0042] Please see Figure 1 and Figure 2 As shown, in one embodiment, the decoupling module 30 includes capacitor C1 and capacitor C2, one end of which is connected to pin 20 of the driver chip U1, and the other end is grounded.

[0043] Specifically, capacitor C1 is a ceramic capacitor, made of X7R material, with a voltage rating of 50V. Capacitor C2 is a low ESR (equivalent series resistance) type, with a voltage rating of 25V. Capacitor C1 is used to filter out high-frequency noise (frequency range 1MHz-100MHz); capacitor C2 is used to filter out low-frequency noise (frequency range 100Hz-1 MHz).

[0044] In other words, capacitor C1 has an impedance of <0.1Ω at 1MHz, which can effectively absorb high-frequency spikes on the power line (such as 10MHz noise generated by a switching power supply). Capacitor C2 has an impedance of <0.01Ω at 100Hz, which can reduce power supply ripple and prevent LED strips from flickering due to voltage fluctuations.

[0045] Please see Figure 1 and Figure 2As shown, in one embodiment, the filtering module 40 includes capacitors C3, C4, and C5. One end of capacitor C3 is connected to pin 13 of the driver chip U1, and the other end is grounded. One end of capacitor C4 is connected to pin 12 of the driver chip U1, and the other end is grounded. One end of capacitor C5 is connected to pin 11 of the driver chip U1, and the other end is grounded.

[0046] Specifically, one end of capacitor C3 is connected to pin 13 of driver chip U1 (PWM_R, red LED drive signal), and the other end is grounded. One end of capacitor C4 is connected to pin 12 of driver chip U1 (PWM_G, green LED drive signal), and the other end is grounded. One end of capacitor C5 is connected to pin 11 of driver chip U1 (PWM_B, blue LED drive signal), and the other end is grounded. Capacitor C3 primarily filters out high-frequency glitches (such as switching noise) in the PWM signal; capacitor C4 further suppresses intermediate frequency harmonics (such as power supply ripple coupling); and capacitor C5 smooths low-frequency fluctuations (such as voltage drops caused by sudden load changes).

[0047] In other words, capacitor C3 reduces noise in the PWM signal, eliminating LED strip flicker. Capacitor C4 reduces the 1MHz harmonic in the PWM signal, making the LED brightness transition smoother. Capacitor C5 reduces ripple in the PWM signal, preventing the LED strip from experiencing brightness changes due to voltage fluctuations.

[0048] Please see Figure 2 As shown, in one embodiment, the pull-up module 50 includes resistor R1 and resistor R2, wherein resistor R1 is connected to pin 1 of the controller chip U2 and resistor R2 is connected to pin 2 of the controller chip U2.

[0049] Specifically, one end of resistor R1 is connected to pin 1 (SDA, I2C data line) of controller chip U2, and the other end is connected to a 3.3V power supply (VDD). One end of resistor R2 is connected to pin 2 (SCL, I2C clock line) of controller chip U2, and the other end is connected to a 3.3V power supply (VDD). When the I2C bus is idle, resistors R1 and R2 pull SDA / SCL to a high level (3.3V) to ensure the bus's default state is stable. When controller chip U2 or LED driver module 10 (U1) actively pulls the signal line low, the voltage is quickly turned to ground (GND) through the internal MOSFET, forming a low level (0V).

[0050] In other words, resistors R1 and R2 stabilize the SDA / SCL idle voltage at 3.25V ± 0.05V (VDD = 3.3V), preventing level drift caused by floating (voltage fluctuation reaches ± 0.8V without pull-up). In electromagnetic interference (EMI) environments, the pull-up resistors reduce the signal bit error rate.

[0051] Please see Figure 1 and Figure 2 As shown, in one embodiment, the controller chip U2 is model MT9266.

[0052] Specifically, the MT9266 features high-performance video processing, low-latency I2C control, and dynamic power management, which can improve the accuracy, stability, and energy efficiency of the projector's Ambilight effect.

[0053] Please see Figure 2 As shown, in one embodiment, the driver chip U1 is model PCA9634PW.

[0054] Specifically, the PCA9634PW features high-precision PWM dimming, strong anti-interference capabilities, and low power consumption, which can improve the stability, energy efficiency, and color reproduction of the projector's LED driver.

[0055] In this utility model, the various components, their models, and connection relationships that are not explicitly stated are... Figure 2 The specific circuit diagram is already shown, so it will not be described again here.

[0056] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. A projector control circuit, characterized by comprising: include: The system comprises an LED driver module, a parsing module, a decoupling module, and a filtering module. The parsing module is used to parse the video or image content being played in real time and transmit the image change signal to the LED driver module. The LED driver module is used to drive RGB LEDs to produce corresponding colors according to the image change signal. The decoupling module is used to decouple the voltage supplied to the LED driver module. The filtering module is used to filter the signal from the LED driver module that drives the RGB LEDs.

2. The projector control circuit according to claim 1, characterized in that, The control circuit also includes a pull-up module, which is used to pull up the voltage so that the parsing module can obtain a high-level signal.

3. The projector control circuit according to claim 2, characterized in that, The parsing module includes a controller chip U2, and pins 1 and 2 of the controller chip U2 are connected to the LED driver module and the pull-up module.

4. The projector control circuit according to claim 3, characterized in that, The LED driving module includes a driving chip U1, pin 19 of which is connected to pin 1 of the controller chip U2, pin 18 of which is connected to pin 2 of the controller chip U2, and pin 20 of which is connected to the decoupling module.

5. The projector control circuit according to claim 4, characterized in that, The LED driver module also includes a resistor R3, one end of which is connected to pin 15 of the driver chip U1, and the other end is grounded.

6. The projector control circuit according to claim 4, characterized in that, The decoupling module includes capacitor C1 and capacitor C2. One end of capacitor C1 and capacitor C2 is connected to pin 20 of the driver chip U1, and the other end is grounded.

7. The projector control circuit according to claim 4, characterized in that, The filtering module includes capacitors C3, C4, and C5. One end of capacitor C3 is connected to pin 13 of the driver chip U1, and the other end is grounded. One end of capacitor C4 is connected to pin 12 of the driver chip U1, and the other end is grounded. One end of capacitor C5 is connected to pin 11 of the driver chip U1, and the other end is grounded.

8. The projector control circuit according to claim 3, characterized in that, The pull-up module includes resistors R1 and R2. Resistor R1 is connected to pin 1 of the controller chip U2, and resistor R2 is connected to pin 2 of the controller chip U2.

9. The projector control circuit according to claim 3, characterized in that, The controller chip U2 is model MT9266.

10. The projector control circuit according to claim 4, characterized in that, The driver chip U1 is model PCA9634PW.

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