Apparatus and method for wireless AC driving of micro-led array

Abstract

The application relates to a device and a method for wirelessly alternating-current driving a Micro-LED array, and belongs to the technical field of Micro-LED array driving. The device comprises an external power supply module, a wireless alternating-current power transmission module, a Micro-LED array and a Micro-LED array wireless control module. The external power supply module is connected with the wireless alternating-current power transmission module and the Micro-LED array wireless control module respectively, and supplies power for the device. The wireless alternating-current power module comprises a power transmission module connected with the external power supply module and a power receiving module connected with the Micro-LED array, and supplies power for the Micro-LED array through receiving wireless alternating-current power. The Micro-LED array adopts an active driving circuit structure, and the wireless alternating-current power receiving module drives the pixel unit to emit light as a power supply in the active driving circuit. The application realizes that the Micro-LED array can still be stably and efficiently driven and generate a target pattern under specified conditions without electrical contact with an external power supply.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of Micro-LED array driving, and particularly relates to a device and method for wirelessly and alternatingly driving a Micro-LED array. BACKGROUND

[0002] With the development of display technology, Micro-LED has attracted more and more attention in the industry due to its significant advantages such as high resolution, high brightness, low power consumption, and long service life. Micro-LED display technology has been developed since the early 2000s, and has gradually shown its great potential in the display field. Micro-LED driving technology, as a key technology, greatly determines the performance and stability of Micro-LED displays.

[0003] Early Micro-LED driving mainly adopts passive driving technology, which drives the pixel units at specified positions through row and column scanning. Passive driving has the advantages of simple structure and easy implementation, but has the problems of low resolution, insufficient brightness, serious line crosstalk, and poor reliability. Currently, Micro-LED arrays more commonly use active driving technology. In active driving, each pixel has an independent driving circuit, which significantly improves the resolution, brightness, color performance, and stability of the Micro-LED array while overcoming the problem of line crosstalk.

[0004] Whether passive driving or active driving belongs to wired driving, and the external power supply provides power for the Micro-LED through wires. However, in some closed and narrow special scenarios, such as implantable medical treatment, optogenetics, and underwater optical communication, the limitations of power supply and wires make wired driving unsuitable for these scenarios. In addition, traditional wired driving uses direct current to drive Micro-LED. Under direct current driving, the Micro-LED array has high brightness and stability, but it can cause color deviation and shorten the service life. In recent years, a new type of contactless and injection-free driving technology has appeared, but it is difficult to achieve addressable lighting of the Micro-LED array, and is more commonly used in the field of Micro-LED detection. Therefore, how to find a driving technology that can stably and efficiently drive Micro-LED in more scenarios is a problem that needs to be solved. SUMMARY

[0005] The present application aims to solve the problems of the prior art and provides a device and method for wirelessly and alternatingly driving a Micro-LED array. The device and method can stably and efficiently drive the Micro-LED array and generate a target pattern under the condition of no electrical contact between the Micro-LED array and the external power supply.

[0006] In order to achieve the above-mentioned purpose, the technical scheme of the present application is: a device for wirelessly alternating current driving a Micro-LED array, comprising an external power supply module, a wireless alternating current power transmission module and a Micro-LED array; wherein,

[0007] The external power supply module has an alternating current output port and a direct current output port, and is connected with the wireless alternating current power transmission module to supply power to the entire device.

[0008] The wireless alternating current power module comprises a power transmitting module and a power receiving module, the power transmitting module is connected with the external power supply module, the power receiving module is connected with the Micro-LED array, and the Micro-LED array is powered by receiving wireless alternating current power.

[0009] The Micro-LED array adopts an active driving circuit structure, and the wireless alternating current power receiving module serves as a power supply in the active driving circuit to drive the pixel units to emit light.

[0010] In an embodiment of the present application, the external power supply module can simultaneously provide alternating current and direct current for the entire device, wherein the direct current amplitude is adjustable within the range of 0-100V, and the alternating current amplitude and frequency are respectively adjustable within the ranges of 0V-50V and 10kHz-100MHz through external signal adjustment.

[0011] In an embodiment of the present application, the power transmitting module and the power receiving module each comprise a resonance compensation circuit and a magnetic coupling coil.

[0012] In an embodiment of the present application, the resonance compensation circuit has frequency selection characteristics, and working at a resonance frequency point can improve the wireless transmission efficiency and driving stability of the entire device; the magnetic coupling coil is used for coupling electromagnetic field energy, and an energy transmission channel is formed between the magnetic coupling coils in a resonance state, energy oscillates back and forth in the channel to realize wireless alternating current power transmission.

[0013] In an embodiment of the present application, the device further comprises a Micro-LED array wireless control module connected with the external power supply module; the Micro-LED array wireless control module comprises a control signal transmitting module and a control signal receiving module, and is used for driving the Micro-LED array to generate a target image meeting specified conditions; wherein the target image meeting specified conditions is an image meeting specified brightness, specified frequency and specified shape.

[0014] In an embodiment of the present application, the control signal transmitting module and the control signal receiving module of the Micro-LED array wireless control module each comprise an FPGA module and a wireless communication module.

[0015] In an embodiment of the present application, the FPGA module in the control signal transmitting module is configured to generate control instructions for the Micro-LED array to generate a target image meeting specified conditions according to the stored optical parameters; the FPGA module in the control signal receiving module is configured to generate corresponding driving signals according to the received control instructions, so that the Micro-LED array generates the target image meeting the specified conditions; and the wireless communication modules in the control signal transmitting module and the control signal receiving module are configured to realize wireless transmission and reception of signals between the FPGA modules in the two modules.

[0016] In an embodiment of the present application, the FPGA module in the control signal receiving module comprises a sensor module configured to collect optical parameters of the Micro-LED array when the Micro-LED array is driven and save the data; the wireless communication module in the control signal receiving module is configured to transmit the data to the FPGA module in the control signal transmitting module via the wireless communication module in the control signal transmitting module, and the FPGA module in the control signal transmitting module adjusts the stored optical parameters in real time according to the received data; and the FPGA module in the control signal transmitting module is connected to an external power supply module and adjusts the amplitude and frequency of the alternating current output by the external power supply module according to the stored optical parameters.

[0017] In an embodiment of the present application, the control signal generated by the FPGA module in the control signal receiving module is used as the row and column scanning signal of the active driving circuit of the Micro-LED array.

[0018] The present application also provides a wireless alternating current driving method based on the wireless alternating current driving Micro-LED array device as described above, which is implemented as follows:

[0019] Wireless alternating current power transmission is realized through the resonance compensation circuit and the magnetic coupling coil in the power transmitting module and the power receiving module, wherein the wireless alternating current power receiving module is used as the power supply of the active driving circuit to provide electrical energy for the Micro-LED pixel units; the Micro-LED array is controlled to generate images with specified brightness, frequency and shape through the Micro-LED array wireless control module, wherein the FPGA module in the control signal transmitting module of the Micro-LED array wireless control module stores relevant optical parameters and generates driving instructions according to the parameters, the FPGA module in the control signal receiving module of the Micro-LED array wireless control module forms corresponding driving signals according to the driving instructions to realize addressable driving of the Micro-LED array; in addition, the sensor module in the FPGA module of the control signal receiving module detects the photoelectric signal of the Micro-LED array and transmits the data to the FPGA module of the control signal transmitting module to adjust the amplitude and frequency of the alternating current output by the external power supply module in real time according to the photoelectric signal.

[0020] Compared with the prior art, the present application has the following beneficial effects: the present application realizes that the Micro-LED array can be stably and efficiently driven and generate the target pattern under the condition of no electrical contact with the external power supply. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is the overall schematic diagram of the wireless alternating current driven Micro-LED array device provided by the present application;

[0022] Figure 2 is the schematic diagram of the wireless alternating current power transmission module of the wireless alternating current driven Micro-LED array device provided by the present application;

[0023] Figure 3 is the schematic diagram of the LCC-LCC resonant compensation circuit of the wireless alternating current driven Micro-LED array device provided by the present application;

[0024] Figure 4 is the schematic diagram of the LCC-LCL resonant compensation circuit of the wireless alternating current driven Micro-LED array device provided by the present application;

[0025] Figure 5 is the schematic diagram of the wireless signal communication module of the wireless alternating current driven Micro-LED array device provided by the present application;

[0026] Figure 6 is the working flow chart of the wireless alternating current driven Micro-LED array device provided by the present application to realize the wireless alternating current power transmission;

[0027] Figure 7 is the working flow chart of the wireless alternating current driven Micro-LED array device provided by the present application to realize the wireless signal transmission. DETAILED DESCRIPTION

[0028] To more clearly illustrate the purpose, technical scheme of the present application, the technical scheme of the present application will be more completely described below in combination with the drawings in the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0029] The present application provides a wireless alternating current driven Micro-LED array device, comprising an external power supply module, a wireless alternating current power transmission module and a Micro-LED array; wherein,

[0030] The external power supply module has an alternating current output port and a direct current output port, and is connected with the wireless alternating current power transmission module to supply power to the entire device.

[0031] The wireless alternating current power module includes a power transmission module and a power receiving module, the power transmission module is connected with the external power supply module, and the power receiving module is connected with the Micro-LED array to supply power to the Micro-LED array by receiving wireless alternating current power.

[0032] The Micro-LED array adopts an active driving circuit structure, and the wireless alternating current power receiving module serves as a power supply in the active driving circuit to drive the pixel units to emit light.

[0033] The device further includes a Micro-LED array wireless control module connected with the external power supply module, the Micro-LED array wireless control module includes a control signal transmission module and a control signal receiving module, and is used to drive the Micro-LED array to generate a target image meeting specified conditions; wherein the target image meeting the specified conditions is an image meeting specified brightness, specified frequency and specified shape.

[0034] The application further provides a wireless alternating current driving method of the device for wirelessly driving the Micro-LED array, and the method is implemented as follows:

[0035] Wireless alternating current power transmission is performed through resonance compensation circuits and magnetic coupling coils in the power transmission module and the power receiving module, the wireless alternating current power receiving module serves as a power supply of an active driving circuit to provide electrical energy for the Micro-LED pixel units, the Micro-LED array wireless control module is used to control the Micro-LED array to generate an image of specified brightness, frequency and shape, the FPGA module of the control signal transmission module of the Micro-LED array wireless control module stores related optical parameters, and driving instructions are generated according to the parameters, the FPGA module of the control signal receiving module of the Micro-LED array wireless control module forms corresponding driving signals according to the driving instructions to realize Micro-LED array addressing driving, in addition, the sensor module in the FPGA module of the control signal receiving module detects photoelectric signals of the Micro-LED array and transmits data to the FPGA module of the control signal transmission module, and the amplitude and frequency of alternating current output by the external power supply module are adjusted in real time according to the photoelectric signals.

[0036] The application will be described in detail below in combination with the drawings and specific embodiments, and the embodiments cannot be described here in their entirety, but the embodiments of the application are not limited to the following embodiments.

[0037] AsFigure 1 As shown, the wireless AC drive Micro-LED array device provided by the present application comprises an external power supply module 110, a wireless AC power transmission module 120, a Micro-LED array 130, and a wireless control signal transmission module 140 (i.e. the above Micro-LED array wireless control module);

[0038] The external power supply module 110 has an AC output port and a DC output port, which are respectively connected with the wireless AC power transmission module 120 and the wireless control signal transmission module 140 to supply power for the device.

[0039] The wireless AC power module 120 comprises a power transmission module and a power receiving module, the power transmission module is connected with the external power supply module, and the power receiving module is connected with the Micro-LED array to supply energy for the Micro-LED array by receiving wireless AC power.

[0040] The Micro-LED array 130 adopts an active driving circuit structure, and the wireless AC power receiving module serves as a power supply in the active driving circuit to drive the pixel units to emit light.

[0041] The wireless control signal transmission module 140 transmits control instructions according to optical parameters and generates corresponding driving signals through the control instructions, and the Micro-LED array 130 generates a target image meeting specified conditions under the driving signals.

[0042] In the embodiment, the external power supply module 110 provides AC and DC for the wireless AC power transmission module 120 and the wireless control signal transmission module 140, respectively, wherein the DC amplitude is adjustable in the range of 0-100V, and the AC amplitude and frequency are adjustable in the ranges of 0V-50V and 10kHz-100MHz, respectively, through external signal adjustment. The wireless AC power transmission module 120 serves as a power supply for the Micro-LED array 130, and the wireless control signal transmission module 140 outputs driving signals to control the Micro-LED array 130 to generate an image meeting specified brightness, specified frequency, and specified shape.

[0043] Figure 2is a schematic diagram of a wireless alternating current power transmission module of a wireless alternating current driving Micro-LED array device provided by the application, and the wireless alternating current power transmission module comprises a resonance compensation circuit 210 of a wireless power transmission circuit, a coupling coil 220, and a resonance compensation circuit 230 of a wireless power receiving circuit. In the embodiment, the resonance compensation circuits 210 and 230 adopt an LCC-LCC / LCL structure, and the structure of the resonance compensation circuit 230 can be adjusted through switches S1, S2, S3, and S4. In addition, the resonance compensation circuits 210 and 230 have frequency selection characteristics, and the wireless transmission efficiency and driving stability of the device are best at the resonance frequency point; the magnetic coupling coil 220 is used for coupling electromagnetic field energy, and an energy transmission channel is formed between the coils in the resonance state, energy oscillates back and forth in the channel, and wireless alternating current power transmission is realized.

[0044] Figure 3 and Figure 4 are schematic diagrams of mutual inductance models of LCC-LCC and LCC-LCL resonance compensation circuits respectively, and two controlled voltage sources jωMI1 and jωMI2 in the model represent the voltage generated by the mutual inductance between the coupling coils, and I1 and I2 are currents flowing through the transmitting coil and the receiving coil respectively. The mutual inductance model of the resonance compensation circuit can be used for circuit analysis, so as to determine the parameters of each compensation device.

[0045] Figure 5 is a schematic diagram of a wireless signal communication module of a wireless alternating current driving Micro-LED array device provided by the application, and the control signal transmitting module and the receiving module of the wireless control signal transmission module are composed of FPGA modules and wireless communication modules;

[0046] The FPGA module 510 in the control signal transmitting module is used for generating a control instruction for driving the Micro-LED array to generate a target image meeting a specified condition according to stored optical parameters;

[0047] The FPGA module 540 in the control signal receiving module is used for generating a corresponding driving signal according to the received control instruction, so that the Micro-LED array generates a target image meeting a specified condition;

[0048] The wireless communication modules 520 and 530 are used for wireless sending and receiving of signals between the FPGA modules.

[0049] The FPGA module in the control signal receiving module comprises a sensor module 550, which is used for collecting optical parameters when the Micro-LED array is driven and saving data in the FPGA module;

[0050] Specifically, the wireless signal communication module of the wireless AC driving Micro-LED array device controls and adjusts the Micro-LED array in real time by using a closed-loop feedback method. The FPGA module 510 in the signal transmitting module generates control instructions according to the stored optical parameters, and sends the instructions to the FPGA module 540 of the signal receiving module through the wireless signal transmitting module 320. The FPGA module 540 of the signal receiving module generates a driving signal to make the Micro-LED array generate an image under specified conditions. At the same time, the sensor module 550 collects the optoelectronic data of the Micro-LED array and transmits the data to the FPGA module 510 through the FPGA module 340 and the wireless communication module 530. The FPGA module 510 adjusts the stored optoelectronic parameters according to the feedback optoelectronic data and adjusts the amplitude and frequency of the AC power output by the external power supply module according to the adjusted optoelectronic parameters.

[0051] Figure 6 The working steps of the device for providing wireless AC power for the Micro-LED array are shown. In step 610, the external power supply module provides the wireless AC power module with AC power with adjustable amplitude and frequency, which can be adjusted by an external signal or manually. In step 620, the transmitting module of the wireless AC power module converts the AC power into an alternating electromagnetic field, and the receiving module converts the alternating electromagnetic field into an alternating current, thereby realizing wireless AC driving of the Micro-LED array. In step 630, the wireless AC power transmission module serves as the driving power source of the active driving circuit of the Micro-LED array, and the Micro-LED array can generate a specified image by controlling the external signal.

[0052] Figure 7 The working steps of the wireless AC driving Micro-LED array device for realizing wireless signal transmission are shown. In step 710, the FPGA of the signal transmitting module in the wireless control module generates a driving instruction according to the stored optical parameters, wherein the optical parameters include a specified brightness, a specified frequency, and a specified shape of the image. In step 720, the FPGA of the signal receiving module in the wireless control module generates a driving signal according to the received driving instruction. In step 730, the Micro-LED array generates an image under specified conditions according to the driving signal. In step 740, the sensor module obtains the optoelectronic parameters of the Micro-LED array during operation and feeds back the parameter information to the FPGA of the signal transmitting module. The collected optoelectronic parameters include the brightness, frequency, operating voltage, and current of the Micro-LED. In step 750, the FPGA of the signal transmitting module adjusts the stored optical parameters according to the feedback information and adjusts the frequency and amplitude of the AC power output by the external power supply module, thereby realizing closed-loop control of the device.

[0053] It should be pointed out finally that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit the same; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features therein can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An apparatus for wireless AC driving of a Micro-LED array, the apparatus comprising: It comprises an external power supply module, a wireless AC power transmission module and a Micro-LED array. The external power supply module has an AC output port and a DC output port, and is connected with the wireless AC power transmission module to supply power to the entire device. The wireless AC power transmission module comprises a power transmission module and a power receiving module, the power transmission module is connected with the external power supply module, and the power receiving module is connected with the Micro-LED array to supply power to the Micro-LED array through receiving wireless AC power. The Micro-LED array adopts an active driving circuit structure, and the power receiving module drives the pixel unit to emit light as a power supply in the active driving circuit. It further comprises a Micro-LED array wireless control module connected with the external power supply module, the Micro-LED array wireless control module comprises a control signal transmission module and a control signal receiving module, and is used to drive the Micro-LED array to generate a target image meeting specified conditions; wherein the target image meeting specified conditions is an image meeting specified brightness, specified frequency and specified shape. The power transmission module and the power receiving module each comprise a resonance compensation circuit and a magnetic coupling coil; the FPGA module in the control signal transmission module is used to generate a control instruction for the Micro-LED array to generate a target image meeting specified conditions according to stored optical parameters; the FPGA module in the control signal receiving module is used to generate a corresponding driving signal according to the received control instruction, so that the Micro-LED array generates a target image meeting specified conditions; and the wireless communication modules in the control signal transmission module and the control signal receiving module are used to realize wireless transmission and reception of signals between the FPGA modules in the two modules.

2. The apparatus of claim 1, wherein, The external power supply module can supply AC and DC power to the entire device at the same time, wherein the DC power amplitude is adjustable in the range of 0-100V, and the AC power amplitude and frequency are adjustable in the ranges of 0V-50V and 10kHz-100MHz respectively through external signal adjustment.

3. The apparatus of claim 1, wherein, The resonance compensation circuit has frequency selection characteristics, and working at a resonance frequency point can improve the wireless transmission efficiency and driving stability of the entire device; and the magnetic coupling coil is used to couple electromagnetic field energy, and in a resonance state, an energy transmission channel is formed between the magnetic coupling coils, energy oscillates back and forth in the channel, and wireless AC power transmission is realized.

4. The apparatus of claim 1, wherein, The control signal transmission module and the control signal receiving module of the Micro-LED array wireless control module each comprise an FPGA module and a wireless communication module.

5. The apparatus of claim 1, wherein, The FPGA module in the control signal receiving module comprises a sensor module for collecting optical parameters of the Micro-LED array when being driven and saving data; the wireless communication module in the control signal receiving module transmits data to the FPGA module in the control signal transmitting module, the FPGA module in the control signal transmitting module adjusts the stored optical parameters in time according to the received data; the FPGA module in the control signal transmitting module is connected to an external power supply module, and adjusts the amplitude and frequency of alternating current output by the external power supply module according to the stored optical parameters.

6. The apparatus of claim 1 or 5, wherein, The control signal emitted by the FPGA module in the control signal receiving module serves as the row and column scanning signal of the active driving circuit of the Micro-LED array.

7. A wireless AC driving method based on the wireless AC driving device of any one of claims 1-5, characterized in that, The following is achieved: Wireless alternating current power transmission is realized through the resonance compensation circuit and the magnetic coupling coil in the power transmitting module and the power receiving module, wherein the wireless alternating current power receiving module serves as the power supply of the active driving circuit and provides electrical energy for the Micro-LED pixel unit; the Micro-LED array generates images of specified brightness, frequency and shape under the control of the Micro-LED array wireless control module, wherein the FPGA module in the control signal transmitting module of the Micro-LED array wireless control module stores relevant optical parameters and generates driving instructions according to the parameters, the FPGA module in the control signal receiving module of the Micro-LED array wireless control module forms corresponding driving signals according to the driving instructions, and the Micro-LED array is driven by addressing; in addition, the sensor module in the FPGA module of the control signal receiving module detects the photoelectric signal of the Micro-LED array and transmits data to the FPGA module of the control signal transmitting module, and the amplitude and frequency of alternating current output by the external power supply module are adjusted in real time according to the photoelectric signal.

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