Intelligent interactive illumination projection lamp based on Micro-LED

Abstract

The invention relates to an intelligent interactive illumination projection lamp based on a Micro-LED (Light Emitting Diode). The device comprises a power supply management unit, a Micro-LED light unit, a light control unit, a storage unit, an LVDS (Low Voltage Differential Signaling) interface unit, a CAN (Controller Area Network) interface unit, an input protection filtering unit and a double-phase DC / DC (Direct Current / Direct Current) voltage stabilizing unit, the light control unit is connected with the storage unit, the Micro-LED light unit, the LVDS interface unit and the CAN interface unit. The double-phase DC / DC voltage stabilization unit is connected with the input protection filtering unit and the Micro-LED light unit. The light control unit receives a projected image signal through the LVDS interface unit; the light control unit receives a control signal through the CAN interface unit, and controls the brightness and image display of the Micro-LED light unit according to the control signal.

Description

Technical Field

[0001] The present invention relates to a vehicle lamp control system, and in particular, discloses an intelligent interactive lighting projection lamp based on Micro-LED. Background Art

[0002] Driven by the wave of vehicle intelligence, vehicle lamp technology is undergoing a paradigm shift from traditional lighting functions to intelligent interactive systems. With its advantages of adaptive control capabilities and modular architecture, intelligent interactive lighting (ISD) technology has gradually established its market dominance through iterative technological implementation paths, such as pixelated light sources, V2X collaborative control, etc.

[0003] Currently, most intelligent interactive lighting (ISD) on the market is designed based on DLP technology. The core of DLP technology is the digital micromirror chip DMD (Digital Micro-mirror Device), which is a mirror composed of millions of micromirrors. Each micromirror can independently control the deflection angle, thereby reflecting the light emitted by the light source, and can achieve fine lighting zoning and ultra-high-definition imaging projection functions. Although DLP technology can achieve millions of pixels, it also has the following disadvantages: First, the optical design and system of DLP technology are relatively complex, requiring very high processing and assembly precision requirements, which greatly reduces the service life in the harsh vehicle environment. Second, the light output efficiency is low, and a high-brightness LED module needs to be additionally configured. The power of the LED module does not decrease due to the reduction of the light output. Third, the DMD device of DLP is sensitive to mechanical vibration, and the mirror angle is prone to shift under vibration, resulting in beam divergence and blurring. Fourth, limited by the adjustment frequency of the DMD device, the response speed of dynamic projection is not fast enough. Fifth, the system structure is complex, with high cost and large volume. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects existing in the prior art, and provide an intelligent interactive lighting projection lamp based on Micro-LED with low energy consumption, more compact structure, high brightness and low cost.

[0005] The present invention is implemented as follows: An intelligent interactive lighting projection lamp based on Micro-LED includes a power management unit, a Micro-LED lighting unit, a lighting control unit, a storage unit, an LVDS interface unit, a CAN interface unit, an input protection and filtering unit, a dual-phase DC / DC voltage stabilizing unit, a temperature detection unit, and a fan drive unit; the power management unit is respectively connected to the Micro-LED lighting unit, the lighting control unit, the storage unit, the input protection and filtering unit, and the dual-phase DC / DC voltage stabilizing unit; the lighting control unit is respectively connected to the storage unit, the Micro-LED lighting unit, the LVDS interface unit, and the CAN interface unit, and the dual-phase DC / DC voltage stabilizing unit is respectively connected to the input protection and filtering unit and the Micro-LED lighting unit; the temperature detection unit is respectively connected to the power management unit and the fan drive unit; The lighting control unit receives the projected image signal through the LVDS interface unit; the lighting control unit receives the control signal through the CAN interface unit, and controls the brightness and image display of the Micro-LED lighting unit according to the control signal; The lighting control unit reads the calibration information of the Micro-LED lighting unit from the storage unit, and adjusts the drive current of the Micro-LED lighting unit.

[0006] The calibration information includes the brightness information, dead pixel information, and initialization information of the Micro-LED lighting unit.

[0007] The LVDS interface unit converts the LVDS signal into a TTL level signal that can be input to the lighting control unit.

[0008] The CAN interface unit converts the differential level of the CAN signal into a TTL level that can be received and sent by the lighting control unit.

[0009] The power management unit includes a 5V primary power supply, a 1.8V secondary power supply, and a 3.3V secondary power supply; the 5V primary power supply converts the input unstable 12V voltage into a stable 5V voltage, and supplies power to the 1.8V secondary power supply, the 3.3V secondary power supply, the Micro-LED lighting unit, the CAN interface unit, and the temperature detection unit; the 3.3V secondary power supply supplies power to the lighting control unit and the storage unit, and provides a reference level for the TTL signal of the CAN interface unit; the 1.8V secondary power supply provides a 1.8V power supply for the Micro-LED lighting unit and the lighting control unit.

[0010] The Micro-LED lighting unit includes 10 first QSPI interfaces for image signal transmission, 1 unidirectional SPI interface for dimming signal transmission, and 1 bidirectional SPI interface for control signal transmission and working state reading, which are respectively connected to the lighting control unit.

[0011] The lighting control unit is connected to the storage unit through a second QSPI interface.

[0012] The dual-phase DC / DC voltage stabilizing unit includes a first power conversion module and a second power conversion module connected in parallel. The first power conversion module is the first phase, and the second power conversion module is the second phase; the dual-phase DC / DC voltage stabilizing unit provides high-current drive for the Micro-LED lighting unit.

[0013] The beneficial effects of the present invention are as follows: through the Micro-LED lighting unit, the light output efficiency of the projection is improved, and the complexity of the optical system is reduced; the LVDS interface unit uses the LVDS communication method to improve the refresh rate of image data; through the dual-phase DC / DC voltage stabilizing unit, the current driving ability and driving efficiency are improved, and the heat distribution is dispersed; the control communication and state reading of the lighting control unit adopt the UART communication method based on the CAN physical layer, which reduces costs and improves reliability; through the temperature detection unit, the fan heat dissipation is automatically controlled, and the service life of the product is improved. The present invention has sensitive dynamic response, simple and reliable optical system, compact structure and low cost. Description of the Drawings

[0014] Figure 1 is a schematic structural diagram of the present invention.

[0015] Figure 2 is a schematic circuit diagram of the power management unit of the present invention.

[0016] Figure 3 is a schematic circuit diagram of the dual-phase DC / DC voltage stabilizing unit of the present invention.

[0017] Figure 4 is a schematic circuit diagram of the temperature detection unit of the present invention. Detailed Embodiments

[0018] According to Figures 1-4, the present invention is an intelligent interactive lighting projection lamp based on Micro-LED, which includes a power management unit, a Micro-LED lighting unit, a lighting control unit, a storage unit, an LVDS interface unit, a CAN interface unit, an input protection and filtering unit, a dual-phase DC / DC voltage stabilization unit, a temperature detection unit and a fan drive unit. The temperature detection unit is respectively connected to the power management unit and the fan drive unit. The power management unit is respectively connected to the Micro-LED lighting unit, the lighting control unit, the storage unit, the input protection and filtering unit and the dual-phase DC / DC voltage stabilization unit; the lighting control unit is respectively connected to the storage unit, the Micro-LED lighting unit, the LVDS interface unit and the CAN interface unit, and the dual-phase DC / DC voltage stabilization unit is respectively connected to the input protection and filtering unit and the Micro-LED lighting unit; The lighting control unit receives the projected image signal through the LVDS interface unit; the lighting control unit receives the control signal through the CAN interface unit and controls the brightness and image display of the Micro-LED lighting unit according to the control signal; the LVDS interface unit converts the LVDS signal into a TTL level signal that can be input by the lighting control unit. The CAN interface unit converts the CAN signal differential level into a TTL level that can be received and sent by the lighting control unit.

[0019] The lighting control unit reads the calibration information of the Micro-LED lighting unit from the storage unit through the second QSPI interface and adjusts the driving current of the Micro-LED lighting unit. The calibration information includes the brightness information, dead pixel information and initialization information of the Micro-LED lighting unit. The lighting control unit can adopt a control module with the model of KEWGBXXD1U_COMPANION ASIC produced by AMS-OSRAM. The storage unit can adopt a Flash storage chip with the model of GD25F64F chip module produced by GigaDevice Semiconductor Inc.

[0020] The LVDS interface unit can adopt an LVDS interface chip with the model of NBA3N012CSN produced by ON Semiconductor. Its function is to convert the LVDS differential signal into a TTL level signal that can be recognized by the lighting control unit.

[0021] The CAN interface unit can adopt a CAN interface chip with the model of TCAN1042 produced by TI. Its function is to convert the CAN bus differential signal into a TTL level signal that can be recognized by the lighting control unit.

[0022] The power management unit includes a 5V primary power supply, a 1.8V secondary power supply, and a 3.3V secondary power supply; the 5V primary power supply converts the unstable 12V voltage input from the vehicle into a stable 5V voltage, and powers the 1.8V secondary power supply, the 3.3V secondary power supply, the Micro-LED lighting unit, the CAN interface unit, and the temperature detection unit; the 3.3V secondary power supply powers the lighting control unit and the storage unit, and provides a reference level for the TTL signal of the CAN interface unit; the 1.8V secondary power supply provides a 1.8V power supply for the Micro-LED lighting unit and the lighting control unit.

[0023] In a preferred example, the 5V primary power supply can adopt the JWQM93902 switching power supply module produced by Jianghuate Company; specifically, the 5V primary power supply includes a first chip module U1, an input filter capacitor bank, and an output filter capacitor bank. The 3rd pin and the 12th pin of the first chip module U1 are power input pins. The input filter capacitor bank includes a first capacitor C1, a second capacitor C2, a dot capacitor C3, and a fourth capacitor C4 connected in parallel with each other. One end of the input filter capacitor bank is connected to the vehicle body power supply, and the other end is connected to the 3rd pin and the 12th pin of the first chip module U1. The 17th pin of the first chip module U1 is the power output pin for the internal operation of the 5V primary power supply, providing a working power supply for the 5V primary power supply itself. The 17th pin of the first chip module U1 is connected to a fifth capacitor C5 for stable output. The output filter capacitor bank includes a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, and a ninth capacitor C9 connected in parallel with each other; the 8th pin, the 9th pin, and the 10th pin of the first chip module U1 are connected to one end of the output filter capacitor bank; the other end of the output filter capacitor bank outputs direct current. The 19th pin of the first chip module U1 is the output voltage feedback input pin. By detecting the voltage signals of the first voltage-dividing resistor R1, the second voltage-dividing resistor R2, and the third voltage-dividing resistor 3, they are transmitted to the first chip module U1. The duty cycle output by the switching tube built in the first chip module U1 drives the inductor built in the first chip module U1 to charge and discharge, so as to achieve the effect of stabilizing the input voltage. The 2nd pin of the first chip module U1 is the enable pin. When a high-level enable signal is input to the 2nd pin of the first chip module U1, the first chip module U1 starts to work, and stops working when the input level is low. Adjusting the resistance values of the first voltage-dividing resistor R1, the second voltage-dividing resistor R2, and the third voltage-dividing resistor 3 can adjust the output voltage. The output voltage of the 5V primary power supply described in the present invention is set to 5V.

[0024] The 3.3V secondary power supply can adopt the linear LDO chip module with the model number JWQ7806 produced by Jianghuai Semiconductor Corporation. Specifically, the 3.3V secondary power supply includes a second chip U2. The first pin of the second chip U2 is the power input pin and is connected to the twelfth filter capacitor C12 and the thirteenth filter capacitor C13 in parallel. The fifth pin of the second chip 2 is the output pin and is connected to the fourteenth filter capacitor C14 and the fifteenth filter capacitor C15 in parallel. The second chip U2 is a linear voltage regulator chip that converts 5V voltage into 3.3V voltage. The third pin of the second chip U2 is always connected to the 5V power supply. When the 5V primary power supply starts to supply power, the 3.3V secondary power supply immediately converts the 5V voltage into 3.3V voltage.

[0025] The 1.8V secondary power supply can adopt the JWQ52992 power converter chip module produced by Jianghuai Semiconductor Corporation. Specifically, the 1.8V secondary power supply includes a third chip U3. The third chip U3 integrates an internal upper switching transistor and a lower switching transistor. The sixth pin of the third chip U3 is the power input pin and is connected to the 5V power supply and the sixteenth filter capacitor C16, the seventeenth filter capacitor C17, and the eighteenth filter capacitor C18 in parallel. The second pin of the third chip U3 is the enable pin and is always connected to the 5V primary power supply through the sixth resistor R6. When the 5V primary power supply starts to supply power, the third chip U3 starts to work. The working principle is as follows: After turning on the third chip U3, the third chip U3 controls the internal upper switching transistor to conduct. The current flows through the sixth pin of the third chip U3 to the internal upper switching transistor to the output pin of the third chip U3, i.e., the fifth pin, the first inductor L1, and the load, forming a loop to charge the first inductor L1. The current gradually increases. The feedback pin of the third chip U3, i.e., the first pin, monitors the output voltage through the seventh voltage-dividing resistor R7, the eighth voltage-dividing resistor R8, and the ninth voltage-dividing resistor R9. When the set upper limit threshold is reached, the third chip U3 disconnects the internal upper switching transistor and simultaneously controls the internal lower switching transistor to conduct. Since the inductor current cannot change suddenly, the energy stored in the first inductor L1 is discharged through the load and the loop formed by the internal lower switching transistor of the third chip U3. The current gradually decreases. The feedback pin and the first pin of the third chip U3 monitor the output voltage through the seventh voltage-dividing resistor R7, the eighth voltage-dividing resistor R8, and the ninth voltage-dividing resistor R9. When the set lower limit threshold is reached, the third chip U3 controls the upper switching transistor to conduct. This process repeats. The output triangular wave AC voltage is filtered by the nineteenth filter capacitor C19, the twentieth filter capacitor C20, and the twenty-first filter capacitor C21 in parallel to obtain a stable DC voltage. By changing the resistance values of the seventh voltage-dividing resistor R7, the eighth voltage-dividing resistor R8, and the ninth voltage-dividing resistor R9, the set voltage can be obtained. The output voltage value of the 1.8V secondary power supply described in the present invention is set to 1.8V.

[0026] The Micro-LED lighting unit includes 10 first QSPI interfaces for image signal transmission, 1 unidirectional SPI interface for dimming signal transmission, and 1 bidirectional SPI interface for control signal transmission and working state reading, which are respectively connected to the lighting control unit. The Micro-LED lighting unit can adopt a lighting module with the model of KEWGBBMD2U produced by AMS-OSRAM Company, and the lighting module of KEWGBBMD2U has a built-in drive circuit. The Micro-LED lighting unit requires three power supplies, among which the 1.8V and 5V power supplies are used to supply power to the built-in drive circuit and are provided by the power management unit, and the other power supply is provided by the dual-phase DC / DC voltage stabilizing unit and is used to drive the LEDs.

[0027] The input protection and filtering unit is a prior art, and its function is to improve the current-carrying capacity, reduce the voltage drop, and reduce the heat generation. The filtering can adopt a Π-type differential-mode filter to suppress the noise interference generated by the power management unit and the dual-phase DC / DC voltage stabilizing unit.

[0028] The dual-phase DC / DC voltage stabilizing unit includes a first power conversion module and a second power conversion module connected in parallel. The first power conversion module is the first phase, and the second power conversion module is the second phase; the dual-phase DC / DC voltage stabilizing unit provides 0-20A current drive for the Micro-LED lighting unit.

[0029] Specifically, the dual-phase DC / DC voltage stabilizing unit can adopt 2 DC / DC power conversion chip modules produced by MPS Company, with the model of MPQ4371. The dual-phase DC / DC voltage stabilizing unit provides 0-20A current drive for the Micro-LED lighting unit.

[0030] The first power conversion module of the dual-phase DC / DC voltage stabilizing unit includes a fourth chip U4, and the second power conversion module includes a fifth chip U5. The fourth chip U4 and the fifth chip U5 respectively have a built-in control circuit, an upper switching tube, and a lower switching tube.

[0031] During operation, taking the first power conversion module, i.e., the first phase, as an example: After turning on the fourth chip U4, the control circuit built into the fourth chip U4 controls the built-in upper switch transistor to conduct. The current flows through the power pins of the fourth chip U4, namely the 5th pin and the 14th pin, to the built-in upper switch transistor, to the output pins, namely the 9th pin and the 10th pin, and then to the second inductor L2 and the load, forming a loop to charge the second inductor L2. The current gradually increases. The feedback pin of the fourth chip U4, the 22nd pin, monitors the output voltage through the eleventh voltage-dividing resistor R11, the twelfth voltage-dividing resistor R12, and the thirteenth voltage-dividing resistor R13. When the set upper limit threshold is reached, the control circuit built into the fourth chip U4 controls the internal upper switch transistor to turn off and simultaneously controls the lower switch transistor to conduct. Since the inductor current cannot change suddenly, at this time, the energy stored in the second inductor L2 discharges through the load and the loop formed by the built-in lower switch transistor of the fourth chip U4, and the current gradually decreases. The feedback pin of the fourth chip U4, i.e., the 22nd pin, monitors the output voltage through the voltage-dividing resistors, the eleventh voltage-dividing resistor R11, the twelfth voltage-dividing resistor R12, and the thirteenth voltage-dividing resistor R13. When the set lower limit threshold is reached, the control circuit built into the fourth chip U4 controls the upper switch transistor to conduct. This process repeats. The output triangular-wave AC voltage is filtered by the parallel-connected twenty-third filter capacitor C23, twenty-fourth filter capacitor C24, twenty-fifth filter capacitor C25, and twenty-sixth filter capacitor C26 to obtain a stable DC voltage. By changing the resistance values of the voltage-dividing resistors, the eleventh voltage-dividing resistor R11, the twelfth voltage-dividing resistor R12, and the thirteenth voltage-dividing resistor R13, a set voltage can be obtained. The working principle of the second power conversion module is the same. The ICS pins between the first phase and the second phase are connected to balance the output currents of the two phases. The phases of the switch transistors of the two phases differ by 180°, reducing the current impact on the input power supply.

[0032] The temperature detection unit includes an operational amplifier U6 and an NTC temperature sensor RT1. The twenty-sixth resistor R26 and the twenty-seventh resistor R27 are connected in series to form a voltage-dividing circuit and are connected back to the hysteresis resistor, the twenty-eighth resistor R28. The voltage-dividing point is connected to the positive input pin of the operational amplifier U6 for setting a reference voltage value. The resistance value of the NTC temperature sensor RT1 becomes smaller when the ambient temperature is higher. The NTC temperature sensor RT1 and the twenty-ninth resistor R29 are connected in series to form a voltage-dividing circuit, and the voltage-dividing point is connected to the negative input pin of the operational amplifier U6. The increase in temperature will cause the resistance value of the NTC temperature sensor RT1 to become smaller, so the voltage divided by it and the twenty-ninth resistor R29 will decrease, that is, the voltage of the negative input pin of the operational amplifier will decrease. When the voltage is based on the positive input pin of the operational amplifier U6, the operational amplifier U6 outputs a high level, and the high level can control the fan drive unit to conduct and drive the fan to rotate. The output of the operational amplifier U6 and the positive input pin are connected with a hysteresis resistor, the twenty-eighth resistor R28. When the operational amplifier U6 outputs a high level, the level of the positive input pin is raised higher than the original through the hysteresis resistor, the twenty-eighth resistor R28. In this way, the operational amplifier U6 can maintain a high-level output and continue to control the fan drive unit to conduct and drive the fan to rotate. The rotation of the fan will reduce the temperature at the detected location, then the resistance value of the NTC temperature sensor RT1 will increase accordingly, and then the voltage of the negative input pin of the operational amplifier U6 will increase. When the voltage is higher than the voltage at the positive input pin of the operational amplifier U6, the operational amplifier U6 outputs a low level, controls the fan drive unit to disconnect, and the fan stops. The output of the low level further pulls down the voltage at the positive input pin of the operational amplifier U6 through the hysteresis resistor, the twenty-eighth resistor R28, so that the operational amplifier U6 maintains a low-level output. By setting the resistance values of the twenty-eighth resistor R28, the twenty-ninth resistor R29, the twenty-sixth resistor R26 and the twenty-seventh resistor R27, as well as the characteristics of the selected NTC sensor RT1, the temperature point at which the fan turns on and the temperature point at which the fan stops can be set.

[0033] The fan drive unit is a prior art. When the input is a high level, it operates to conduct and drive the fan to rotate. When the input is a low level, it operates to cut off and disconnect the power supply of the fan, and the fan stops.

Claims

1. A smart interactive lighting projection lamp based on Micro-LED, characterized in that: It includes a power management unit, a Micro-LED light unit, a light control unit, a storage unit, an LVDS interface unit, a CAN interface unit, an input protection filter unit, a dual-phase DC / DC voltage regulator unit, a temperature detection unit and a fan drive unit; the power management unit is respectively connected to the Micro-LED light unit, the light control unit, the storage unit, the input protection filter unit and the dual-phase DC / DC voltage regulator unit; the light control unit is respectively connected to the storage unit, the Micro-LED light unit, the LVDS interface unit and the CAN interface unit, the dual-phase DC / DC voltage regulator unit is respectively connected to the input protection filter unit and the Micro-LED light unit; the temperature detection unit is respectively connected to the power management unit and the fan drive unit; The light control unit receives the projected image signal through the LVDS interface unit; the light control unit receives the control signal through the CAN interface unit, and controls the brightness and image display of the Micro-LED light unit according to the control signal; The lighting control unit reads the calibration information of the Micro-LED lighting unit from the storage unit and adjusts the driving current of the Micro-LED lighting unit.

2. The Micro-LED-based intelligent interactive lighting projection lamp according to claim 1, characterized in that: The calibration information includes brightness information, bad pixel information and initialization information of the Micro-LED lighting unit.

3. The Micro-LED-based intelligent interactive lighting projection lamp according to claim 1, characterized in that: The LVDS interface unit converts the LVDS signal into a TTL level signal that can be input by the lighting control unit.

4. The Micro-LED-based intelligent interactive lighting projection lamp according to claim 1, characterized in that: The CAN interface unit converts the CAN signal differential level into a TTL level that can be introduced and sent by the lighting control unit.

5. The Micro-LED-based intelligent interactive lighting projection lamp according to claim 1, characterized in that: The power management unit includes a 5V primary power supply, a 1.8V secondary power supply and a 3.3V secondary power supply; the 5V primary power supply converts the input unstable 12V voltage into a stable 5V voltage, and supplies power to the 1.8V secondary power supply, the 3.3V secondary power supply, the Micro-LED lighting unit, the CAN interface unit and the temperature detection unit; the 3.3V secondary power supply supplies power to the lighting control unit and the storage unit, and provides a reference level for the TTL signal of the CAN interface unit; the 1.8V secondary power supply provides 1.8V power to the Micro-LED lighting unit and the lighting control unit.

6. The Micro-LED-based intelligent interactive lighting projection lamp according to claim 1, characterized in that: The Micro-LED lighting unit includes 10 first QSPI interfaces for image signal transmission, one unidirectional SPI interface for dimming signal transmission, and one bidirectional SPI interface for control signal transmission and working status reading, which are respectively connected to the lighting control unit.

7. The Micro-LED-based intelligent interactive lighting projection lamp according to claim 1, characterized in that: The light control unit is connected to the storage unit via a second QSPI interface.

8. The Micro-LED-based intelligent interactive lighting projection lamp according to claim 1, characterized in that: The dual-phase DC / DC voltage regulator unit includes a first power conversion module and a second power conversion module connected in parallel, the first power conversion module is a first phase, and the second power conversion module is a second phase; the dual-phase DC / DC voltage regulator unit provides 0~20A current drive for the Micro-LED lighting unit.

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