CN211481554U

CN211481554U - Luminance and chroma adjustable combination formula 3D RGB LED light cube device

Info

Publication number: CN211481554U
Application number: CN202020211497.2U
Authority: CN
Inventors: 董兵; 庄文格; 程文辉; 余彦菲
Original assignee: Guangdong Industry Technical College
Current assignee: Guangdong Industry Technical College
Priority date: 2020-02-26
Filing date: 2020-02-26
Publication date: 2020-09-11
Anticipated expiration: 2030-02-26

Abstract

The utility model discloses a luminance and chroma adjustable combination formula 3D RGB LED light cube device, device include a plurality of 3D RGB light cube units, WIFI wireless router and mobile terminal, a plurality of 3D RGB light cube units pass through WIFI wireless router and are connected with mobile terminal, and every 3D RGB light cube unit includes array light cube, face drive circuit, numerical control resistance circuit, layer drive circuit, single chip microcomputer controller, USB interface, WIFI module and the light sensor that a plurality of RGB emitting diode constitute, face drive circuit, numerical control resistance circuit, layer drive circuit, light sensor, USB interface and WIFI module all are connected with single chip microcomputer controller, array light cube and face drive circuit and numerical control resistance circuit are connected, numerical control resistance circuit still is connected with layer drive circuit. The utility model discloses can realize the control to three kinds of colours and luminance of each RGB emitting diode.

Description

Luminance and chroma adjustable combination formula 3D RGB LED light cube device

Technical Field

The utility model belongs to the technical field of the light cube, concretely relates to luminance and chromaticity adjustable combination formula 3DRGB LED light cube device.

Background

Although LED light cubes are used in a wide variety of applications, the performance requirements for LED light cubes are also increasing. The current LED light cubic product has various varieties, but has a plurality of problems:

1. the adopted single-color LED can not display true color three-dimensional pictures.

2. The displayed picture brightness is not uniform and adjustable, for example, a single LED is bright when displayed, a full LED is dark when displayed, and the display brightness of the light cube under different external light environments cannot be automatically adjusted.

3. The adopted asynchronous PWM waveform output is easy to generate picture flicker.

4. The displayed light cubes are fixed in volume, cannot be combined for application, can only be used for displaying pictures in the fixed light cubes, and cannot be combined randomly according to display requirements to form a light cube display body with larger volume.

Therefore, a brightness and color tunable LED light cube is the direction of research by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a main aim at overcomes prior art's shortcoming and not enough, provides a luminance and combination formula 3D RGB LED light cube device of chroma adjustable, realizes the control to three kinds of colours and luminance of each RGB emitting diode.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a luminance and chromaticity adjustable combined 3D RGB LED light cube device comprises a plurality of 3D RGB light cube units, a WIFI wireless router and a mobile terminal, wherein the 3D RGB light cube units are connected with the mobile terminal through the WIFI wireless router, each 3D RGB light cube unit comprises an array light cube, a face driving circuit, a numerical control resistance circuit, a layer driving circuit, a single chip microcomputer controller, a USB interface, a WIFI module and an optical sensor, the array light cube, the numerical control resistance circuit, the layer driving circuit, the optical sensor, the USB interface and the WIFI module are all connected with the single chip microcomputer controller, the array light cube is connected with the face driving circuit and the numerical control resistance circuit, and the numerical control resistance circuit is also connected with the layer driving circuit; the WIFI wireless router connects data transmitted by a WIFI module of the 3D RGB light cube unit with the mobile terminal, and the function of remotely controlling each 3D RGB light cube unit is achieved.

As a preferred technical scheme, each 3D RGB light cube unit is an array light cube consisting of 8 multiplied by 8 RGB LEDs, all the RGB LEDs are common-cathode RGB LEDs, and the rated driving voltage is 2.7V-3.8V; the rated drive current was 20 mA.

As a preferred technical scheme, the numerical control resistance circuit comprises a fixed resistance and a digital potentiometer connected with the fixed resistance in parallel; the numerical control resistance circuit changes the resistance value of the current limiting resistor in real time according to the number of the RGB LEDs driven by each surface under the control of the single chip microcomputer controller, keeps the current flowing through each RGBLED basically consistent and realizes the uniformity of the light cubic brightness; meanwhile, the resistance value of the data resistor is changed in real time according to the change of the peripheral light environment, so that the current flowing through the RGBLED is basically consistent, and the brightness of the 3D RGB light cube unit is automatically changed.

As a preferred technical scheme, the layer driving circuit is used for realizing RGB LED driving and brightness control of each layer together with a numerical control resistance circuit under the control of a single chip microcomputer controller; the layer control circuit adopts a 9926A field effect transistor module as a layer controller, controls the on and off of the field effect transistor according to the level of the control level, thereby controlling the on and off of the RGB LED cathode common end and the power supply cathode of each layer, and controls the selection of layers to form different patterns through the singlechip controller.

As a preferred technical scheme, the surface driving circuit is controlled by the singlechip controller and is used for receiving data sent by the singlechip controller and driving and controlling the gated 2D RGB LED on a certain surface; the surface driving circuit adopts 74HC573 as a surface driving circuit, controls R, G, B three pins of RGB LED, and when the layer scanning signal is generated by the layer driving circuit, the 74HC573 drives the RGB LED anode on the surface 2D RGB LED to be switched on or off.

As a preferred technical scheme, the single chip microcomputer controller is used for outputting surface data, controlling a numerical control resistance circuit and layer scanning, realizing brightness and chromaticity control of the 3D RGB light cube, and displaying various patterns and RGB color changes on the 3D RGB light cube; the singlechip controller adopts an STC15W4K singlechip.

As a preferred technical scheme, the USB interface is used for finishing data communication between the upper computer and the singlechip controller; the USB interface adopts a CH340G chip;

the WIFI module is connected with the USB interface through the single chip microcomputer controller to realize wireless network transmission of data; the WIFI module adopts a DT-06 wireless WIFI serial port transparent transmission module;

the optical sensor is used for monitoring the current environment brightness in real time, connecting the photometric voltage which is in direct proportion to the current brightness to the AD interface end of the single chip microcomputer controller, and converting the analog photometric voltage into digital quantity.

The principle of the utility model is that:

on the basis of a face 2D RGB LED 8X 3 common positive lattice, a combined 3D RGB LED cube is built by applying a stacking technology to divide 8 layers into common negative parts. The single chip microcomputer controller controls the output of the surface drive circuit, the numerical control resistance circuit and the layer drive circuit, indirectly controls the brightness and the chromaticity of the combined 3D RGB LED light cube, adopts a layer-by-layer scanning working mode, and utilizes the visual persistence effect of people to realize the three-dimensional display of dynamic and static characters and images.

The 8 × 8 × 3 common-anode lattice of the control surface 2D RGB LED needs 64 × 3 pins in total, the 8-layer 8-surface 2DRGB LED 8 × 8 × 3 common-anode lattice is in total, and the on-off of each layer needs to be controlled by 8 pins. Because the number of ports of the single chip microcomputer controller is limited, when a single-side 64 × 3RGB LED lamp is controlled, each RGB LED lamp has R, G, B three pins, 64 × 3 pins in total, a method of 24 latches 74HC573 for temporarily storing data is adopted as surface driving, lighting data of 64 × 3RGB LED lamps are respectively given to the 24 latches 75HC573, and then a certain layer is turned on, that is, the RGB LED lamp of the layer can be lighted. The number of RGB LEDs to be controlled on each layer is large, the current is large, and 4 9926A integrated blocks are used for on-off control of the layers, so that the defect that the control current of a controller interface is small is overcome. After the control data of each side is input into the latch, the corresponding layer drive is gated by using the layer selection signal, 8 layers are swept out once in one period, and because the visual retention time of human eyes is longer than the time of the period, a complete three-dimensional pattern is presented in the human eyes. By using the working principle, the effect of static pictures and animation on the light cube is realized.

Compared with the prior art, the utility model, following advantage and beneficial effect have:

the utility model discloses a combination formula 3D RGB LED light cube device has adopted wireless data transmission technical means, passes through module and internet access through WIFI, realizes the data synchronization of a plurality of light cube units, remote control and picture combination, has solved the fixed volume of current light cube, can only carry out the picture display in fixed light cube, can't the remote design picture, can't carry out the technical problem of arbitrary combination according to showing the needs; by adopting the RGB three-color brightness control technology, each RGB light-emitting diode can display full color, and the light cube can display various three-dimensional display patterns of the full color, thereby solving the technical problem that the display color of the existing light cube is single; by adopting an LED constant current technology, the RGB LED current-limiting resistance value is changed in a self-adaptive manner through the detection of the light sensor on different external light environments and the numerical control resistance circuit, so that the display brightness of the light cube under any external light environment is uniform and adjustable, and the technical problems that the brightness of the display picture of the existing light cube is not uniform and cannot be automatically adjusted are solved; by adopting a synchronous PWM technology and synchronous application of a timer in a single chip microcomputer controller, the method realizes that the picture of the RGB LED light cube is not flashed and the chromaticity is adjustable, and solves the technical problem that the display picture is flashed because the existing light cube is asynchronous PWM.

Drawings

Fig. 1 is a block diagram of the 3D RGB LED light cube device of the present invention.

Fig. 2 is a flowchart of the control method of the present invention.

Fig. 3 is a schematic diagram of the working principle of the synchronous PWM of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the following examples and drawings, but the present invention is not limited thereto.

Examples

As shown in fig. 1, the combined 3D RGB LED light cube device with adjustable brightness and chromaticity in this embodiment includes a plurality of 3D RGB light cube units, a WIFI wireless router, and a mobile terminal, where the plurality of 3D RGB light cube units are connected to the mobile terminal through the WIFI wireless router, each 3D RGB light cube unit includes an array light cube, a face driving circuit, a numerical control resistance circuit, a layer driving circuit, a single chip controller, a USB interface, a WIFI module, and a light sensor, where the array light cube, the numerical control resistance circuit, the layer driving circuit, the light sensor, the USB interface, and the WIFI module are all connected to the single chip controller, the array light cube is connected to the face driving circuit and the numerical control resistance circuit, and the numerical control resistance circuit is further connected to the layer driving circuit; the WIFI wireless router connects data transmitted by a WIFI module of the 3D RGB light cube unit with the mobile terminal, and the function of remotely controlling each 3D RGB light cube unit is achieved.

Optionally, each 3D RGB light cube unit is an array light cube composed of 8 × 8 × 8 RGB LEDs, all RGB LEDs are common-cathode RGB LEDs, and the rated driving voltage is 2.7V-3.8V; the rated drive current was 20 mA.

Further, the array light cube composed of 8 × 8 × 8 RGB LEDs is composed as follows:

the light cube consists of 512 RGB LEDs. RGB LEDs are red, green, and blue colored light emitting diodes. The 3D RGB LED light cube adopts a 5mm fog-like common cathode RGB LED. The RGB LED can be replaced by other types, but the following conditions need to be met: rated driving voltage 3.3V (2.7V-3.8V); the rated driving current is 20 mA; a common cathode RGB LED is necessary.

Furthermore, the numerical control resistance circuit changes the resistance value of each layer of current-limiting resistance in real time under the control of the singlechip controller according to the current illumination environment of the light cube, realizes the self-adaptive change of the brightness of the light cube along with the change of the current illumination environment, and ensures that the light cube can display images and animations with uniform brightness in any illumination environment. The numerical control resistance circuit consists of a fixed resistor and a digital potentiometer DS3906 connected with the fixed resistor in parallel.

The numerical control resistance circuit changes the resistance value of the current limiting resistor in real time according to the number of the RGB LEDs driven by each surface under the control of the single chip microcomputer controller, and keeps the current flowing through each RGBLED basically consistent, namely, the uniformity of the light cubic brightness is realized. Meanwhile, the resistance value of the data resistor can be changed in real time according to the change of the peripheral light environment, so that the current flowing through the RGBLED is basically consistent, and the brightness of the light cube is automatically changed. The digital control resistance circuit consists of a fixed resistor and a digital potentiometer connected in parallel with the fixed resistor.

Digital potentiometers DS3906, DS3906 are the latest I introduced by D allis semiconductor²The C bus digital potentiometer comprises three 64-level nonvolatile, small-step-size and adjustable potentiometers and a 16B user EEPROM and is packaged by adopting 10-pin mu SOP. In conjunction with external shunt resistors, DS3906 provides very low resistance and linear grading, which is the lowest resistance variable resistor solution in the industry today. Using two-wire serial I²And the C bus interface is easy to control by software and can be used for directly reading and writing the position of the sliding end. Wide voltage working range +2.7V- + 5.5V. Simulating I through two IO interfaces of the singlechip²And the interface C is used for realizing software adjustment of each resistance value of the digital potentiometer DS3906, so that the brightness of the light cube layer is automatically adjusted.

Further, the layer driving circuit is controlled by the single chip microcomputer controller and used for realizing the driving and brightness control of 64 RGB LEDs on each layer together with the numerical control resistance circuit. When 64 RGB LEDs on each layer are simultaneously lightened, each layer has large current concentration, a large-current driving module is needed, and a 9926A field effect transistor module is selected as a layer circuit controller. 9926A is adopted to control the connection and disconnection of the common end of the LED cathode of each layer and the negative electrode of the power supply, and the singlechip controller is used for controlling different patterns of the chip selection layer assembly. And the data of the control layer is transmitted to the 9926A field effect transistor module, and the 9926A field effect transistor module controls the on and off of the field effect transistor according to the control level. When a high level is input, the 9926A corresponding field effect transistor is conducted, and a corresponding layer is gated; when a low level is input, 9926A corresponding field effect transistor is turned off, and the corresponding layer is not turned on.

Furthermore, the surface driving circuit is controlled by the singlechip controller and is used for receiving data sent by the singlechip controller and driving and controlling the gated 2D RGB LED on a certain surface. The 74HC573 is adopted as a surface drive circuit, R, G, B three pins of the RGBLED are controlled, 64I/O ports are needed for control, and therefore 24 74HC573 are needed for surface drive. When the layer scan signal is generated by the layer driving circuit, the RGB LED anodes on the face 2D RGB LED are driven by 74HC573 to be turned on or off.

Further, the single chip microcomputer controller is used for outputting the surface data, controlling the numerical control resistance circuit and layer scanning, realizing the brightness and chromaticity control of the 3D RGB light cube, and displaying various patterns and RGB color changes on the 3D RGB light cube.

The single chip microcomputer controller adopts an STC15W4K single chip microcomputer model, has a wide voltage working range and does not need any conversion chip. The STC15W4K series single-chip microcomputer can directly carry out ISP downloading programming through a computer USB interface, integrates more SRAMs (4 Kbytes), 7 timers (5 common timers and 2 CCP timers), 4 serial ports and more high-performance components (such as a comparator, 6-path 15-bit special PWM with dead zone control and the like); the number of IO pins is 64, and the control of face driving, layer driving and numerical control resistance circuits can be realized.

Further, the USB interface is used for finishing data communication between the upper computer and the single chip microcomputer controller. And is realized by using a CH340G chip. The chip is a switching chip of a USB bus, USB switching to a serial port is achieved, and as the power supply is the same as the power supply of the single chip microcomputer, a peripheral circuit only needs a crystal oscillator and a capacitor, and a connecting circuit is convenient and simple.

Furthermore, the WIFI module is connected with the USB interface through the single chip microcomputer controller, and wireless network transmission of data is achieved. The adopted WIFI module is a DT-06 wireless WIFI serial port transparent transmission module, and according to an interface of the DT-06 wireless WIFI serial port transparent transmission module and a serial port connected with an STC15W4K single chip microcomputer, a 2 pin (RXD) and a 3 pin (TXD) of the DT-06 wireless WIFI serial port transparent transmission module respectively correspond to a P5.1 pin (TXD) and a P5.0 pin (RXD) of the single chip microcomputer controller.

Furthermore, the WIFI wireless router is used for connecting data transmitted by each light cube unit WIFI module with the internet or a mobile phone WIFI module, so that the function of remotely controlling each light cube unit is realized. And a wireless router of TP-LINK TL-WR700N type is adopted to realize the data communication between each light cube unit and a mobile terminal or the Internet.

Further, the optical sensor is used for monitoring the current ambient brightness in real time, connecting a photometric voltage which is in direct proportion to the current brightness to an AD interface end of the single chip microcomputer controller, and converting the analog photometric voltage into a digital quantity. The light sensor selects a photoresistor, and the photoresistor is arranged at the bottom of the light cube to detect the illuminance of visible light in the current environment in real time. The photoresistor is of an LXD3516 model, the diameter of the photoresistor is 3mm, the bright resistance of the photoresistor is 5-10K omega, and the dark resistance of the photoresistor is 0.6M omega.

As shown in fig. 2, the control method of the combined 3D RGB LED light cube device with adjustable luminance and chromaticity in this embodiment includes several steps of a current ambient luminance detection state, an automatic luminance adjustment state, a communication reception state, an automatic chromaticity adjustment state, and a communication transmission state, and specifically includes:

1. the current ambient brightness detection state:

the brightness of the current environment of the light cube during the action is detected, and the reference brightness data is provided for the singlechip controller so as to automatically adjust the brightness displayed by the light cube. The current environment brightness data is connected to the AD interface end of the single chip microcomputer controller through the optical sensor, and the analog photometric voltage is converted into digital quantity to be achieved. The whole machine is started, the light cube is completely extinguished, the light intensity collected by the light sensor is ensured to be the brightness value of the current environment, then, the system starts the light cube to be completely bright, and the system enters a brightness automatic adjustment state.

2. The brightness automatic adjustment state:

the brightness of the light cube is automatically adjusted according to the current ambient brightness. When the brightness of the displayed image of the light cube is not consistent with the intensity of the ambient light, the eyes will have visual fatigue, and the fatigue will cause irreversible damage to the eyes. The brightness automatic adjustment state is that the numerical control resistance circuit changes the resistance value of each layer of current-limiting resistance in real time according to the current illumination environment of the light cube under the control of the singlechip controller, so that the brightness of the light cube changes adaptively along with the change of the current illumination environment, and the light cube can display graphs and animations which enable eyes not to generate visual fatigue under any illumination environment. Meanwhile, the resistance value of the current-limiting resistor is changed in real time according to the number of the RGB LEDs driven by each surface, so that the current flowing through each RGBLED is kept basically consistent, and the uniformity of the light cubic brightness is realized. And after the brightness state determines the brightness data, entering a communication receiving state.

3. A communication receiving state:

and receiving display graphic data transmitted by the upper computer through the WIFI module and the USB port, storing the display graphic data into a memory of the single-chip microcomputer controller, and entering an automatic chromaticity adjusting state.

4. Automatic chromaticity adjustment state:

the synchronous PWM driving device is used for realizing synchronous PWM driving of the light cube by downloading the sent display graphic data into a timer counter in the singlechip controller. The timer in the single chip microcomputer controller is used for realizing synchronous PWM waveform output, and picture flicker prevention and chromaticity adjustability are guaranteed.

The schematic diagram of the synchronous PWM working principle is shown in fig. 3, wherein the value in the timer 1 of the single chip microcomputer controller is used for determining the width of the rgb led red PWM, and the value can be changed from 0 to 255; the value in the timer 2 of the singlechip controller is used for determining the width of the RGBLED green PWM, and the value can be changed from 0 to 255; the value in the timer 3 of the singlechip controller is used for determining the width of the RGBLED blue PWM, and the value can be changed from 0 to 255; the value in timer 4 of the single chip microcomputer controller is used for determining the RGBLED scanning period T, and the value is 255.

After the display graphics are executed, the system enters a communication sending state.

5. Communication transmission state:

and sending the working state and the display state of the current light cube to the upper computer, thereby providing state data for the upper computer to perform the next control. After the communication state is executed, the system enters a dormant state and waits for the next display data to arrive.

The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all are included in the scope of the present invention.

Claims

1. A combined 3D RGB LED light cube device with adjustable brightness and chromaticity is characterized by comprising a plurality of 3D RGB light cube units, a WIFI wireless router and a mobile terminal, wherein the 3D RGB light cube units are connected with the mobile terminal through the WIFI wireless router, each 3D RGB light cube unit comprises an array light cube, a face driving circuit, a numerical control resistance circuit, a layer driving circuit, a single chip microcomputer controller, a USB interface, a WIFI module and a light sensor, the array light cube, the face driving circuit, the numerical control resistance circuit, the layer driving circuit, the light sensor, the USB interface and the WIFI module are all connected with the single chip microcomputer controller, the array light cube is connected with the face driving circuit and the numerical control resistance circuit, and the numerical control resistance circuit is also connected with the layer driving circuit; the WIFI wireless router connects data transmitted by a WIFI module of the 3D RGB light cube unit with the mobile terminal, and the function of remotely controlling each 3D RGB light cube unit is achieved.

2. The luminance and chromaticity adjustable combined 3D RGB LED light cube device of claim 1, wherein each 3D RGB light cube unit is an array light cube consisting of 8 x 8 RGB LEDs, all of which are common cathode RGB LEDs, with a rated driving voltage of 2.7V-3.8V; the rated drive current was 20 mA.

3. The luminance and chromaticity adjustable combined 3D RGB LED light cube device of claim 1, wherein the digitally controlled resistive circuit includes a fixed resistor and a digital potentiometer in parallel with the fixed resistor; the numerical control resistance circuit changes the resistance value of the current limiting resistor in real time according to the number of the RGB LEDs driven by each surface under the control of the single chip microcomputer controller, keeps the current flowing through each RGBLED basically consistent and realizes the uniformity of the light cubic brightness; meanwhile, the resistance value of the data resistor is changed in real time according to the change of the peripheral light environment, so that the current flowing through the RGBLED is basically consistent, and the brightness of the 3D RGB light cube unit is automatically changed.

4. The luminance and chromaticity adjustable combined 3D RGB LED light cube device of claim 1, wherein the layer driving circuit is under the control of a single chip controller for implementing RGB LED driving and luminance control of each layer together with a digital control resistance circuit; the layer driving circuit adopts a 9926A field effect transistor module as a layer controller, controls the on and off of the field effect transistor according to the level of the control level, thereby controlling the on and off of the RGB LED cathode common end and the power supply cathode of each layer, and controls the selection of layers to form different patterns through the singlechip controller.

5. The luminance and chromaticity adjustable combined 3D RGB LED light cube device of claim 1, wherein the surface driving circuit is under the control of the single chip controller, for receiving data from the single chip controller and driving and controlling the gated 2D RGB LEDs of a certain surface; the surface driving circuit adopts 74HC573 as a surface driving circuit, controls R, G, B three pins of the RGB LED, and drives the RGBLED anode on the surface 2D RGB LED to be switched on or off by the 74HC573 after the layer scanning signal is generated by the layer driving circuit.

6. The luminance and chromaticity adjustable combined 3D RGB LED light cube of claim 1, wherein the single chip controller is configured to output surface data, control the digitally controlled resistive circuits and layer scanning to achieve luminance and chromaticity control of the 3D RGB light cube, display various patterns and RGB color variations on the 3D RGB light cube; the singlechip controller adopts an STC15W4K singlechip.

7. The luminance and chromaticity adjustable combined 3D RGB LED light cube device of claim 1, wherein the USB interface is used to complete data communication between an upper computer and a single chip controller; the USB interface adopts a CH340G chip;