Wireless alternating current driving apparatus and method for micro-led array

Abstract

A wireless alternating current driving apparatus and method for a Micro-LED array (130). The apparatus comprises an external power supply module (110), a wireless alternating current power transmission module (120), the Micro-LED array (130), and a Micro-LED array wireless control module (140). The external power supply module (110) is separately connected to the wireless alternating current power transmission module (120) and the Micro-LED array wireless control module (140) to supply power to the apparatus. The wireless alternating current power transmission module (120) comprises a power transmitting module connected to the external power supply module (110) and a power receiving module connected to the Micro-LED array (130), and by receiving wireless alternating current power, supplies power to the Micro-LED array (130). The Micro-LED array (130) uses an active drive circuit structure, and the power receiving module serves as a power supply in an active drive circuit to drive a pixel unit to emit light. Even without electrical contact with an external power supply, the Micro-LED array (130) can still be stably and efficiently driven and generate a target pattern satisfying a specified condition.

Description

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

[0001] The present application belongs to the technical field of Micro-LED array driving, and particularly relates to an apparatus and method for wireless AC driving of 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 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 unit at a specified position through row and column scanning. Passive driving is simple and easy to implement, but has low resolution, insufficient brightness, serious line crosstalk, poor reliability, and other problems. 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 emerged, but this driving method 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. TECHNICAL PROBLEM

[0005] The purpose of the present application is to provide a device and method for wireless AC driving of a Micro-LED array, which can be stably and efficiently driven and generate a target pattern under specified conditions without electrical contact between the Micro-LED array and an external power supply. Technical solutions

[0006] To achieve the above-mentioned purpose, the technical solution of the present application is: a device for wireless AC driving of a Micro-LED array, comprising an external power supply module, a wireless AC power transmission module, and a Micro-LED array; wherein,

[0007] 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.

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

[0009] The Micro-LED array 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.

[0010] In an embodiment of the present application, the external power supply module can simultaneously provide AC and DC power to the entire device, wherein the DC amplitude is adjustable within the range of 0-100V, and the AC 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 the 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 in the 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.

[0013] In an embodiment of the present application, the device further comprises a Micro-LED array wireless control module connected to the external power supply module; the Micro-LED array wireless control module comprises a control signal transmitting module and a control signal receiving module, 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 are both composed of 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 used to generate a control instruction for driving 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; the wireless communication modules in the control signal transmitting 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.

[0016] In an embodiment of the present application, the FPGA module in the control signal receiving module comprises a sensor module, for collecting optical parameters when the Micro-LED array is driven and saving the data; the wireless communication module in the control signal receiving module transmits the data of the wireless communication module in the control signal transmitting module to the FPGA module in the control signal transmitting module, and the FPGA module in the control signal transmitting module adjusts the stored optical parameters in a timely manner according to the received data; the FPGA module in the control signal transmitting module is connected to the 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 emitted by the FPGA module in the control signal receiving module serves as a row and column scanning signal of the active driving circuit of the Micro-LED array.

[0018] The present application further provides a wireless alternating current driving method based on the above-mentioned device for wirelessly alternating current driving a Micro-LED array, which realizes the following:

[0019] Wireless alternating current power transmission is carried out through the resonance compensation circuit and the magnetic coupling coil in the power transmission module and the power receiving module, 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 an image with a specified brightness, frequency and shape under the control of the Micro-LED array wireless control module, the optical parameters are stored in the FPGA module of the control signal transmission module of the Micro-LED array wireless control module, and the 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 the corresponding driving signal according to the driving instructions, and realizes the addressing 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 transmission module, and the amplitude and frequency of the alternating current output by the external power supply module are adjusted in real time according to the photoelectric signal. Advantages

[0020] Compared with the prior art, the present application has the following advantages: the present application realizes that the Micro-LED array can be stably and efficiently driven and generate a target pattern under the condition that the Micro-LED array is not in electrical contact with the external power supply. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 is a schematic diagram of the wireless alternating current driving Micro-LED array device provided by the present application;

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

[0023] Fig. 3 is a schematic diagram of the LCC-LCC resonance compensation circuit of the wireless alternating current driving Micro-LED array device provided by the present application;

[0024] Fig. 4 is a schematic diagram of the LCC-LCL resonance compensation circuit of the wireless alternating current driving Micro-LED array device provided by the present application;

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

[0026] Fig. 6 is a working flowchart of the wireless alternating current power transmission of the wireless alternating current driving Micro-LED array device provided by the present application;

[0027] Fig. 7 is a working flowchart of the wireless signal transmission of the wireless alternating current driving Micro-LED array device provided by the present application. Embodiments of the present application

[0028] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions will be described below in conjunction with the accompanying drawings in the present application. Obviously, the described embodiments are only part of, rather than all of, the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

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

[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 whole device.

[0031] 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.

[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 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 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.

[0034] The present application further provides a wireless alternating current driving method based on the wireless alternating current driving Micro-LED array device, and the method is implemented as follows.

[0035] Wireless alternating current power transmission is performed by resonance compensation circuits and magnetic coupling coils in the power transmission module and the power receiving module, wherein the wireless alternating current power receiving module serves as a power supply for an active driving circuit to provide electrical energy for a Micro-LED pixel unit; a Micro-LED array generates an image with a specified brightness, frequency and shape under the control of a Micro-LED array wireless control module, wherein the FPGA module of the control signal transmission module of the Micro-LED array wireless control module stores relevant optical parameters, and generates a driving instruction according to the parameters, and the FPGA module of the control signal receiving module of the Micro-LED array wireless control module forms a corresponding driving signal according to the driving instruction to realize Micro-LED array addressing driving; 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 transmission module, and the amplitude and frequency of the alternating current output by the external power supply module are adjusted in real time according to the photoelectric signal.

[0036] The application will be described in detail below in conjunction with the accompanying 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] As shown in FIG. 1, the device for wirelessly driving a Micro-LED array provided by the application comprises an external power supply module 110, a wireless alternating current power transmission module 120, a Micro-LED array 130 and a wireless control signal transmission module 140 (i.e. the Micro-LED array wireless control module mentioned above);

[0038] The external power supply module 110 has an alternating current output port and a direct current output port, which are connected with the wireless alternating current power transmission module 120 and the wireless control signal transmission module 140 respectively to supply power to the device;

[0039] The wireless alternating current power module 120 comprises a power transmission module and a power receiving module, wherein 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 to the Micro-LED array by receiving wireless alternating current power.

[0040] The Micro-LED array 130 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 unit to emit light.

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

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

[0043] FIG. 2 is a schematic diagram of a wireless AC power transmission module of the wireless AC driven Micro-LED array device provided by the present application, which includes 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 this 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 by 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 to couple electromagnetic field energy, and an energy transmission channel is formed between the coils in the resonance state, and the energy oscillates back and forth in the channel to achieve wireless AC power transmission.

[0044] FIGS. 3 and 4 are schematic diagrams of mutual inductance models of LCC-LCC and LCC-LCL resonance compensation circuits, respectively. The two controlled voltage sources jωMI1 and jωMI2 in the model represent the voltage generated by the mutual inductive interaction between the coupling coils, and I1 and I2 are the 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 to determine the parameters of each compensation device.

[0045] FIG. 5 is a schematic diagram of a wireless signal communication module of the wireless AC driven Micro-LED array device provided by the present application, wherein the control signal transmitting module and the receiving module of the wireless control signal transmission module are composed of an FPGA module and a wireless communication module.

[0046] The FPGA module 510 in the control signal transmitting module is used to generate a control instruction for driving the Micro-LED array to generate a target image that meets the specified conditions according to the stored optical parameters.

[0047] The FPGA module 540 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 that meets the specified conditions.

[0048] The wireless communication modules 520 and 530 are used for wireless transmission and reception of signals between FPGA modules.

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

[0050] Specifically, the wireless signal communication module of the wireless AC driving Micro-LED array device provided by the present application adopts a closed-loop feedback method to control and adjust the Micro-LED array in real time. 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 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 photoelectric 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 photoelectric parameters according to the feedback photoelectric data and adjusts the amplitude and frequency of the AC power output by the external power supply module according to the adjusted photoelectric parameters.

[0051] Fig. 6 shows the working steps of the device for providing wireless AC power for the Micro-LED array. In step 610, the external power supply module provides the wireless AC power module with AC power with adjustable amplitude and frequency, wherein the amplitude and frequency can be adjusted by external signals 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 supply 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] Fig. 7 is a working step of wireless signal transmission of wireless AC driving Micro-LED array device. Step 710, the FPGA of signal transmitting module in wireless control module generates driving instruction according to stored optical parameters, wherein the optical parameters include specified brightness, specified frequency, and specified shape of image; Step 720, the FPGA of signal receiving module in wireless control module generates driving signal according to received driving instruction; Step 730, the Micro-LED array generates image under specified condition according to driving signal; Step 740, the sensor module obtains photoelectric parameters of Micro-LED array during working and feeds back parameter information to the FPGA of signal transmitting module, and the collected photoelectric parameters include brightness, frequency, working voltage and current of Micro-LED; Step 750, the FPGA of signal transmitting module adjusts stored optical parameters according to feedback information and adjusts frequency and amplitude of AC output by external power supply module, so as to realize closed-loop control of the device

[0053] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the above examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the above examples, or make equivalent replacement for part of the technical features; 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 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 wireless AC power receiving module serves as a power supply in the active driving circuit to drive the pixel units to emit light.

2. The apparatus of claim 1, wherein, The external power supply module can supply AC and DC power to the entire device simultaneously, the DC power has an adjustable amplitude in the range of 0-100V, and the AC power has an adjustable amplitude in the range of 0V-50V and an adjustable frequency in the range of 10kHz-100MHz through external signal adjustment.

3. The apparatus of claim 1, wherein, The power transmission module and the power receiving module each comprise a resonance compensation circuit and a magnetic coupling coil.

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

5. The apparatus of claim 1, wherein, 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 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.

6. The apparatus of claim 5, 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.

7. The apparatus of claim 6, wherein, The FPGA module in the control signal transmission module is used for generating a control instruction for driving 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 for generating 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 for realizing wireless transmission and reception of signals between the FPGA modules in the two modules.

8. The apparatus of claim 7, 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.

9. The apparatus of claim 7 or 8, 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.

10. A wireless AC driving method based on the wireless AC driving Micro-LED array device of any one of claims 5-9, 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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