Passive LED drive circuit and protective shell of mobile terminal

Abstract

The embodiment of the utility model provides a passive LED driving circuit and a protective shell of a mobile terminal. The passive LED driving circuit comprises an antenna circuit; the electricity taking and storing circuit is connected with the antenna circuit, converts the radio frequency energy transmitted by the mobile terminal into electric energy through the antenna circuit and stores the electric energy; the LED circuit comprises a plurality of LED lamps, the LED circuit is connected with the electricity taking and storing circuit, and the electricity taking and storing circuit supplies power to the LED circuit; and the microprocessor is connected with the LED circuit, and the microprocessor can respectively control the display state of each LED lamp. The power taking and storage circuit can supply power to the LED circuit, and the microprocessor can respectively control the display state of each LED lamp, so that passive power supply to the LED circuit is realized, a battery does not need to be arranged, different parts of the plurality of LED lamps can be lightened to form different patterns, such as different numbers, letters, characters and expressions, the patterns can be dynamically changed, and the requirements of users are met.

Description

Technical Field

[0001] The present application relates to the field of electronic technology, and in particular to a passive LED driving circuit and a protective shell of a mobile terminal. Background Art

[0002] With the development of science and technology, mobile terminals such as mobile phones have become indispensable devices in people's daily lives. With the increasing number of mobile terminal functions, the use scenarios of mobile terminals are also increasing, and the time of using mobile terminals is also increasing. Mobile terminals are generally equipped with protective cases to protect the mobile terminals. Some protective cases are provided with patterns to meet customer needs. At present, protective cases often have only static patterns or no patterns, which cannot meet customer needs. Utility Model Content

[0003] The embodiments of the present application provide a passive LED driving circuit and a protective case for a mobile terminal. Multiple LED lights in the passive LED driving circuit can be controlled individually and form different patterns to meet user needs.

[0004] In a first aspect, an embodiment of the present application provides a passive LED driving circuit, comprising:

[0005] Antenna circuit;

[0006] A power collection and storage circuit, connected to the antenna circuit, and converting the radio frequency energy transmitted by the mobile terminal into electrical energy through the antenna circuit and storing the electrical energy;

[0007] An LED circuit, including a plurality of LED lamps, wherein the LED circuit is connected to the power supply and storage circuit, and the power supply and storage circuit supplies power to the LED circuit;

[0008] A microprocessor is connected to the LED circuit, and the microprocessor can control the display state of each LED lamp respectively.

[0009] In some embodiments, a plurality of the LED lights are arranged in a matrix, and the LED circuit further includes a first drive circuit and a second drive circuit. The microprocessor supplies power to a plurality of rows of the LED lights in sequence through the first drive circuit, and drives part or all of the columns of the LED lights in each row of the LED lights to light up through the second drive circuit.

[0010] In some embodiments, the microprocessor controls different LED lights in the LED circuit to light up in sequence.

[0011] In some embodiments, the passive LED driving circuit further includes:

[0012] A DC-DC circuit, wherein the input end of the DC-DC circuit is connected to the output end of the power extraction and storage circuit, the DC-DC circuit can change the output voltage of the power extraction and storage circuit, and the output end of the DC-DC circuit is connected to the LED circuit and supplies power to the LED circuit.

[0013] In some embodiments, the output end of the DC-DC circuit is also connected to the microprocessor and provides power to the microprocessor.

[0014] In some embodiments, the passive LED driving circuit further includes:

[0015] The NFC chip is connected to the antenna circuit and wirelessly communicates with the mobile terminal through the antenna circuit. The microprocessor is connected to the NFC chip and obtains the control instruction sent by the mobile terminal through the NFC chip.

[0016] In some embodiments, the passive LED driving circuit further includes:

[0017] An input circuit is connected to the microprocessor, and the input circuit can generate a control instruction according to an external trigger operation, so that the microprocessor changes the display of some of the LED lights in the LED circuit according to the control instruction.

[0018] In some embodiments, the power extraction and storage circuit includes:

[0019] A matching circuit, connected to the antenna circuit and cooperating with the antenna circuit to output electrical energy;

[0020] a rectifier circuit connected to the matching circuit and rectifying the electric energy output by the antenna circuit and the matching circuit;

[0021] The energy storage circuit is connected to the rectifier circuit and stores the rectified electric energy; the energy storage circuit is also connected to the LED circuit and supplies power to the LED circuit.

[0022] In a second aspect, an embodiment of the present application further provides a protective case for a mobile terminal, which includes:

[0023] A housing, used for installation with a mobile terminal;

[0024] A passive LED driving circuit is installed in the housing, and the passive LED driving circuit is the passive LED driving circuit described above.

[0025] In some embodiments, the shell includes a back side facing away from the mobile terminal, multiple LED lights of the passive LED driving circuit are arranged on the back side, the back side includes a display area, the multiple LED lights are evenly arranged in the display area, and the area of ​​the display area occupies more than 40% of the area of ​​the back side.

[0026] In the passive LED driving circuit of the embodiment of the present application, the power taking and storage circuit and the antenna circuit can cooperate to wirelessly take and store power. The power taking and storage circuit can power the LED circuit. The microprocessor can control the display status of each LED lamp separately, thereby realizing passive power supply to the LED circuit. There is no need to set up a battery. Different parts of the LED lamps in the multiple LED lamps can also be lit to form different patterns, such as different numbers, letters, text, expressions, etc., and the patterns can be dynamically changed to meet the needs of users. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0028] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same figure numbers represent the same parts in the following description.

[0029] Figure 1 This is a schematic diagram of the first structure of the passive LED driving circuit provided in an embodiment of the present application.

[0030] Figure 2 for Figure 1 The specific structural schematic diagram of the power extraction and storage circuit in the passive LED driving circuit is shown.

[0031] Figure 3 for Figure 1 Schematic diagram of the structure of the LED circuit in the passive LED driving circuit shown.

[0032] Figure 4 A second structural schematic diagram of the passive LED driving circuit provided in an embodiment of the present application.

[0033] Figure 5 This is a third structural schematic diagram of the passive LED driving circuit provided in an embodiment of the present application.

[0034] Figure 6 This is a fourth structural schematic diagram of the passive LED driving circuit provided in an embodiment of the present application.

[0035] Figure 7 This is a fifth structural schematic diagram of the passive LED driving circuit provided in the embodiment of the present application.

[0036] Figure 8 A schematic diagram of the circuit structure of a power supply and storage circuit in a passive LED drive circuit provided in an embodiment of the present application.

[0037] Fig. 9 A schematic diagram of the circuit structure of a DC-DC circuit in a passive LED driving circuit provided in an embodiment of the present application.

[0038] Fig.10 A schematic diagram of the circuit structure of an NFC chip in a passive LED driving circuit provided in an embodiment of the present application.

[0039] Fig.11 For Fig.10 Schematic diagram of the circuit structure of the NFC chip shown.

[0040] Fig.12 A schematic diagram of the circuit structure of a microprocessor in a passive LED driving circuit provided in an embodiment of the present application.

[0041] Fig.13 A schematic diagram of the circuit structure of the first driving circuit in the passive LED driving circuit provided in an embodiment of the present application.

[0042] Fig.14 A schematic diagram of the circuit structure of the second driving circuit in the passive LED driving circuit provided in an embodiment of the present application.

[0043] Fig.15 A schematic diagram of the circuit structure of an LED matrix in a passive LED driving circuit provided in an embodiment of the present application.

[0044] Fig.16 A schematic diagram of the structure of a protective case for a mobile terminal provided in an embodiment of the present application.

[0045] Description of reference numerals:

[0046] 100, passive LED driving circuit, 110, antenna circuit, 120, microprocessor, 130, power supply and storage circuit, 132, matching circuit, 134, rectifier circuit, 136, energy storage circuit, 140, LED circuit, 142, LED lamp, 144, first driving circuit, 146, second driving circuit, 150, DC-DC circuit, 160, NFC chip, 170, input circuit;

[0047] 200. Mobile Terminal

[0048] 300, protective shell, 320, shell. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0050] The present application embodiment provides a passive LED driving circuit. Figure 1 , Figure 1 The first structural diagram of the passive LED driving circuit provided in the embodiment of the present application is as follows: The passive LED driving circuit 100 includes an antenna circuit 110 , a power supply and storage circuit 130 , an LED circuit 140 and a microprocessor 120 .

[0051] The antenna circuit 110 can be wirelessly connected to a mobile terminal 200 such as a mobile phone. The antenna circuit 110 can include an NFC antenna or the like.

[0052] The power collection and storage circuit 130 is connected to the antenna circuit 110 , and converts the radio frequency energy transmitted by the mobile terminal 200 into electrical energy through the antenna circuit 110 and stores the electrical energy.

[0053] The LED circuit 140 includes a plurality of LED lamps. The LED circuit 140 is connected to the power supply and storage circuit 130 . The power supply and storage circuit 130 supplies power to the LED circuit 140 .

[0054] The microprocessor 120 is connected to the LED circuit 140 , and the microprocessor 120 can control the display state of each LED lamp respectively.

[0055] The power supply and storage circuit 130 and the antenna circuit 110 can cooperate to wirelessly supply and store power. The power supply and storage circuit 130 can supply power to the LED circuit 140, thereby realizing passive power supply to the LED circuit 140. There is no need to set up a battery, and the LED circuit 140 can be applied in passive scenarios, such as in the protective shell 300 of the mobile terminal 200. It should be noted that the power of the LED circuit 140 is relatively large. If it is powered by a battery, the battery needs to be replaced frequently, which is inconvenient to use. If a large-capacity battery is used, the overall volume is relatively large, which is not suitable for small or thin products, such as the protective shell 300 of the mobile terminal 200. Passive power supply can solve the problem that small-capacity batteries need to be replaced frequently and large-capacity batteries are large in size. When there is no mobile terminal 200 to provide RF energy, the passive LED drive circuit 100 is in a completely powerless state, achieving true zero power consumption, and the circuit is highly safe.

[0056] The microprocessor 120 can control the display state of each LED lamp respectively, so that different parts of the multiple LED lamps can be lit to form different patterns, such as different numbers, letters, words, expressions, etc. The passive LED driving circuit 100 can passively draw power and dynamically change the pattern to meet the needs of users.

[0057] In some embodiments, see Figure 2 , Figure 2 for Figure 1 The specific structural diagram of the power supply and storage circuit in the passive LED driving circuit is shown. The power supply and storage circuit 130 includes a matching circuit 132 , a rectifier circuit 134 and an energy storage circuit 136 .

[0058] The matching circuit 132 is connected to the antenna circuit 110 and cooperates to output electrical energy. The matching circuit 132 and the antenna circuit 110 cooperate to better obtain the radio frequency signal of the mobile terminal 200. For example, the matching circuit 132 can cooperate with the antenna circuit 110 to adjust the resonant frequency of the antenna circuit 110 so as to be closer to the frequency of the radio frequency signal. The closer the resonant frequency of the antenna circuit 110 is to the frequency of the radio frequency signal, the more energy the antenna circuit 110 can obtain.

[0059] The rectifier circuit 134 is connected to the matching circuit 132 and rectifies the electric energy output by the antenna circuit 110 and the matching circuit 132. The rectifier circuit 134 may include different circuit structures as required, such as a rectifier bridge or a diode.

[0060] The energy storage circuit 136 is connected to the rectifier circuit 134 and stores the rectified electric energy. The energy storage circuit 136 may include one energy storage capacitor or multiple energy storage capacitors connected in parallel. The energy storage circuit 136 is connected to the LED circuit 140, and the energy storage circuit 136 supplies power to the LED circuit 140 after storing enough electric energy.

[0061] The matching circuit 132 cooperates with the antenna circuit 110 to output an oscillation wave signal, the rectifier circuit 134 rectifies the oscillation wave signal and outputs a direct current signal, and the energy storage circuit 136 stores the direct current signal.

[0062] In some embodiments, see Figure 3 , Figure 3 for Figure 1The schematic diagram of the structure of the LED circuit in the passive LED driving circuit is shown. The plurality of LED lamps 142 are arranged in a matrix, that is, the plurality of LED lamps 142 include a plurality of rows of LED lamps 142 or a plurality of columns of LED lamps 142. The LED circuit 140 further includes a first driving circuit 144 and a second driving circuit 146. The microprocessor 120 sequentially supplies power to the plurality of rows of LED lamps 142 through the first driving circuit 144, and drives the LED lamps 142 in part or all of the columns in each row of LED lamps 142 to light up through the second driving circuit 146.

[0063] The first driving circuit 144 supplies power to the multiple rows of LED lights 142 in sequence, and the second driving circuit 146 drives some or all of the columns of LED lights 142 in each row of LED lights 142 to light up as needed, so that the multiple LED lights 142 dynamically light up the corresponding LED lights 142 row by row, and finally some of the LED lights 142 are displayed to form corresponding patterns.

[0064] It is understandable that the microprocessor 120 can dynamically drive the LED circuit 140 to display different patterns in sequence as needed, such as cyclically displaying multiple numbers, letters, words or expressions.

[0065] In some embodiments, the microprocessor 120 controls different LEDs 142 in the LED circuit 140 to light up in sequence. It is understandable that the microprocessor 120 can control some of the LEDs 142 in the LED circuit 140 to light up to form a corresponding pattern. The microprocessor 120 can also control different parts of the LEDs 142 in the LED circuit 140 to light up in sequence, thereby forming a plurality of patterns that change in sequence, with an animation-like effect. For example, each digit of a phone number is displayed in sequence to form a scrolling display of the phone number. For another example, each word of a paragraph is displayed in sequence to form a scrolling display of the paragraph.

[0066] In some embodiments, see Figure 4 , Figure 4 The second structural diagram of the passive LED driving circuit provided in the embodiment of the present application. The passive LED driving circuit 100 also includes a DC-DC circuit 150, the input end of the DC-DC circuit 150 is connected to the output end of the power supply and storage circuit 130, the DC-DC circuit 150 can change the output voltage of the power supply and storage circuit 130, and the output end of the DC-DC circuit 150 is connected to the LED circuit 140 and supplies power to the LED circuit 140.

[0067] It should be noted that in order to store more electric energy, the storage voltage of the power supply and storage circuit 130 is a higher voltage. For example, the energy storage circuit 136 of the power supply and storage circuit 130 includes an energy storage capacitor, and the rated voltage of the energy storage capacitor is relatively high, which can reach more than ten V or even tens of V, such as 16V, 20V, 25V, 30V or 36V, etc. The energy storage capacitor with the highest rated voltage can store more electric energy and has a stronger driving ability. The energy storage capacitor with a higher rated voltage stores more electric energy, so that the LED circuit 140 can be driven stably and for a long time. However, the energy storage capacitor with a higher rated voltage cannot directly drive related circuits such as the LED circuit 140. Therefore, the passive LED driving circuit 100 is further provided with a DC-DC circuit 150, and the DC-DC circuit 150 is connected to the output end of the power taking and storage circuit 130, so as to provide the signal output by the power taking and storage circuit 130 to the LED circuit 140 after the voltage is reduced, such as reducing the voltage of the signal output by the power taking and storage circuit 130 to about 3V or about 5V to supply power to the LED circuit 140. The voltage value of the output signal of the DC-DC circuit 150, i.e., the voltage value after the voltage reduction, is set according to the circuit to be driven as required, such as reducing the voltage to 3V or 5V as required by the LED circuit 140.

[0068] It should be noted that the more LED lights there are, the better the pattern effect that can be displayed, but at the same time, more power is required. In some examples, the LED circuit 140 includes 16*16 LED lights. In some other examples, the LED circuit 140 may include 15*15 LED lights, 15*20 LED lights, 20*20 LED lights, 20*25 LED lights, 25*25 LED lights, etc. The number and arrangement of the LED lights in the LED circuit 140 can be set as needed, such as the LED lights can also be arranged into regular images or irregular images, such as circles, ellipses, trapezoids, regular polygons, stars, flowers, hearts, etc.

[0069] In some embodiments, see Figure 5 , Figure 5 The third structural diagram of the passive LED driving circuit provided in the embodiment of the present application. The passive LED driving circuit 100 further includes an NFC chip 160, the NFC chip 160 is connected to the antenna circuit 110, and wirelessly communicates with the mobile terminal 200 through the antenna circuit 110, and the microprocessor 120 is connected to the NFC chip 160, and obtains the control instructions sent by the mobile terminal 200 through the NFC chip 160.

[0070] The microprocessor 120 communicates wirelessly with the mobile terminal 200 through the NFC chip 160 and the antenna circuit 110. After the microprocessor 120 obtains the control instruction through the NFC chip 160, the microprocessor 120 can control different numbers of LED lights or LED lights in different positions to light up according to the control instruction, so that some LED lights light up and form corresponding patterns, such as different numbers, letters, texts, expressions, etc. The mobile terminal 200 can control the LED circuit 140 through the antenna circuit 110, the NFC chip 160 and the microprocessor 120, such as changing the display content, display duration, display brightness, display color, flashing frequency, etc. of the LED circuit 140.

[0071] In some embodiments, the NFC chip 160 can obtain electrical energy through the antenna circuit 110 , and the electrical energy obtained by the NFC chip 160 is less than the electrical energy obtained by the power extraction and storage circuit 130 .

[0072] The NFC chip 160 may be integrated with an energy processing circuit to process the energy provided by the antenna circuit 110 and convert it into electrical energy, thereby powering the NFC chip 160 itself, thereby activating other functions of the NFC chip 160, such as controlling other circuits, etc. It is understandable that the electrical energy obtained by the NFC chip 160 is much less than the electrical energy obtained by the power extraction and storage circuit 130.

[0073] In some embodiments, the NFC chip 160 is connected to the antenna circuit 110 and obtains power through the antenna circuit 110. The NFC chip 160 can power the microprocessor 120. For example, the NFC chip 160 can provide a voltage of about 3V, so that the microprocessor 120 can also start working before the remote power storage circuit 130 stores enough power.

[0074] For some examples, see Figure 6 , Figure 6 A fourth structural schematic diagram of the passive LED driving circuit provided in the embodiment of the present application. The output end of the DC-DC circuit 150 is connected to the microprocessor 120, and the microprocessor 120 is connected to the control end of the DC-DC circuit 150. The power supply of the microprocessor 120 can be switched from the power supply of the NFC chip 160 to the power supply of the DC-DC circuit 150. After the power supply and storage circuit 130 stores enough electric energy, it supplies power to the microprocessor 120 through the DC-DC circuit 150, which can provide more stable electric energy. The power supply and storage circuit 130 supplies power to the microprocessor 120 through the DC-DC circuit 150 and can also provide higher power, so that the microprocessor 120 starts more functional modules or adopts a higher operating frequency to provide stronger processing capabilities.

[0075] It is understandable that the power supply voltage provided by the DC-DC circuit 150 to the microprocessor 120 and the LED circuit 140 can be the same, and the DC-DC circuit 150 can simultaneously power the microprocessor 120 and the LED circuit 140 through one output port. The power supply voltage provided by the DC-DC circuit 150 to the microprocessor 120 and the LED circuit 140 can be different, and the DC-DC circuit 150 can respectively power the microprocessor 120 and the LED circuit 140 through two output ports.

[0076] In some embodiments, see Figure 7 , Figure 7 The fifth structural diagram of the passive LED driving circuit provided in the embodiment of the present application. The passive LED driving circuit 100 also includes an input circuit 170, which is connected to the microprocessor 120. The input circuit 170 can generate a control instruction according to an external trigger operation, so that the microprocessor 120 changes the display of some LED lights in the LED circuit 140 according to the control instruction. The user can also directly control the LED circuit 140 through the input circuit 170 without using another device. For example, the input circuit 170 includes one or more buttons, and the user controls the LED circuit 140 by operating one or more buttons, such as changing the display content, display duration, display brightness, display color, flashing frequency, etc. of the LED circuit 140. The button can be a press button, a toggle button, or a touch button (such as a pressure sensor button or a capacitive sensor button), etc. Of course, in some other embodiments, the input device can also be other components, such as a microphone, etc.

[0077] The input circuit 170 is also connected to the power taking and storing circuit 130 , and the power taking and storing circuit 130 supplies power to the input circuit 170 , so that the input circuit 170 can collect the user's operation.

[0078] In order to better understand this solution, an example is given below to illustrate.

[0079] See also Figure 8 , Figure 8 The circuit structure diagram of the power supply and storage circuit in the passive LED driving circuit provided in the embodiment of the present application. In the power supply and storage circuit 130, the matching circuit 132 can be set as needed, such as including capacitors C3 and C4; the rectifier circuit 134 can be a rectifier bridge formed by diodes D1, D2, D3 and D4; the energy storage circuit 136 can be capacitors C5, C6, C7, C8, C9 and C10 connected in parallel.

[0080] A current limiting resistor R14 and a voltage regulator diode D5 may be provided between the rectifier circuit 134 and the energy storage circuit 136 as required.

[0081] Understandably, Figure 8The circuit shown is only an example, and the matching circuit 132, the rectifier circuit 134 and the energy storage circuit 136 can be configured as other circuit structures as needed.

[0082] Please combine Fig. 9 , Fig. 9 A schematic diagram of the circuit structure of the DC-DC circuit in the passive LED driving circuit provided in the embodiment of the present application. The DC-DC circuit 150 includes a transformer chip U3, the enable end EN of the transformer chip U3 is controlled by the microprocessor 120, the input end IN of the transformer chip U3 is connected to the output end of the power supply and storage circuit 130, and the DC-DC circuit 150 also includes a peripheral circuit matched therewith, the peripheral circuit includes a capacitor C11, an inductor L1, a capacitor C13, a capacitor C14, a resistor R6, a resistor R7, a diode D6 and a diode D9, and the peripheral circuit cooperates with the transformer chip U3 to output the required voltage. Among them, the inductor L1 is used for energy storage, the capacitor C11 is used to eliminate oscillation, the resistor R6 and the resistor R7 divide the voltage to output a suitable voltage, and the diode D6 and the diode D9 are used to prevent the signal from flowing back.

[0083] Please combine Fig.10 and Fig.11 , Fig.10 This is a schematic diagram of the circuit structure of the NFC chip in the passive LED drive circuit provided in the embodiment of the present application. Fig.11 For Fig.10 The schematic diagram of the circuit structure of the NFC chip shown in the figure. The NFC chip can be connected to the antenna circuit for data communication and energy acquisition, and can also be connected to the microprocessor through I2C to achieve communication and control. The voltage output pin VOUT of the NFC chip can output a voltage signal such as NFCVCC through the diode D10 to power the microprocessor, etc. The voltage output pin VOUT can also be grounded through the capacitor C13 for filtering, and the negative terminal of the diode D10 can be filtered through the capacitor C11 and the capacitor C12.

[0084] Please combine Figures 12 to 15 , Fig.12 A schematic diagram of the circuit structure of a microprocessor in a passive LED driving circuit provided in an embodiment of the present application, Fig.13 Schematic diagram of the circuit structure of the first driving circuit in the passive LED driving circuit provided in the embodiment of the present application, Fig.14 Schematic diagram of the circuit structure of the second driving circuit in the passive LED driving circuit provided in the embodiment of the present application, Fig.15A schematic diagram of the circuit structure of the LED matrix in the passive LED driving circuit provided in the embodiment of the present application. The microprocessor is respectively connected to the first driving circuit and the second driving circuit, and controls the first driving circuit and the second driving circuit. Pins 27-30 of the microprocessor are respectively connected to the first driving circuit and transmit ROW_DA, ROW_OE, ROW_LE, and ROW_CK signals, so that the first driving circuit outputs ROW1-ROW8 to the LED matrix to power each row of LED lamps. Pins 19-22 of the microprocessor are respectively connected to the second driving circuit and transmit COL_DA, COL_CK, COL_OE, and COL_LE signals, so that the second driving circuit outputs COL_P00-COL_P14 to the LED matrix to light up the corresponding LED lamps in each row of LED lamps. Among them, each LED lamp has 3 light-emitting tubes, and the 3 light-emitting tubes emit red, blue, and green light respectively, and the required color can be combined by the 3 light-emitting tubes.

[0085] It is understandable that this embodiment may also have other circuit structures. For example, the number of LED lamps may be set to be greater, and correspondingly, the first drive circuit may be provided with two or more first drive chips, and the second drive circuit may be provided with two or more second drive chips. For example, the first drive circuit is provided with two first drive chips, so that 16 rows of LED lamps can be driven, and the second drive circuit is provided with two second drive chips, so that 10 columns of LED lamps can be controlled. Of course, a chip with more drive pins may also be selected to reduce the number of chips.

[0086] In some examples, one or more filter capacitors may be connected to each power port. For example, the VCC port, the NFCVCC port, etc. may each be connected to one or more filter capacitors.

[0087] In some examples, the antenna circuit has two first connection ports connected to the matching circuit respectively, and a capacitor can be set between the two first connection ports. The antenna circuit also has two second connection ports connected to the NFC chip respectively, and a capacitor can be set between the two first connection ports.

[0088] The present application also provides a protective case for a mobile terminal. Fig.16 , Fig.16 A schematic diagram of the structure of a protective shell of a mobile terminal provided in an embodiment of the present application. The protective shell 300 of the mobile terminal includes a housing 320 and a passive LED driving circuit 100, the housing 320 is used to be installed with the mobile terminal 200, the passive LED driving circuit 100 is installed in the housing 320, and the passive LED driving circuit 100 is the passive LED driving circuit 100 in any of the above embodiments.

[0089] The housing 320 is installed on the mobile terminal 200 and can protect the mobile terminal 200. For example, the housing 320 can be mounted on the periphery of the mobile terminal 200 to protect the mobile terminal 200.

[0090] In some examples, the housing 320 includes a back side facing away from the mobile terminal 200, and a plurality of LED lamps of the passive LED driving circuit 100 are arranged on the back side. The back side includes a display area, and a plurality of LED lamps are evenly arranged in the display area, and the display area area occupies more than 40% of the back area. The power supply and storage circuit 130 can provide a large amount of energy to support the large-area display of the LED driving circuit 100, and the display area area is large, and more content can be displayed. The display area area can also occupy a larger proportion of the back area, such as more than 50% or more than 60% or more than 70% of the back area.

[0091] In some examples, the mobile terminal 200 may be a mobile phone, and the protective case 300 may be a mobile phone case.

[0092] In the above embodiments, the description of each embodiment has its own emphasis. For parts not described in detail in a certain embodiment, reference can be made to the relevant description of other embodiments. The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0093] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0094] The passive LED driving circuit and the protective case of the mobile terminal provided in the embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A passive LED driving circuit, characterized in that: include: Antenna circuit; A power collection and storage circuit, connected to the antenna circuit, and converting the radio frequency energy transmitted by the mobile terminal into electrical energy through the antenna circuit and storing the electrical energy; An LED circuit, including a plurality of LED lamps, wherein the LED circuit is connected to the power supply and storage circuit, and the power supply and storage circuit supplies power to the LED circuit; A microprocessor is connected to the LED circuit, and the microprocessor can control the display state of each LED lamp respectively.

2. The passive LED driving circuit according to claim 1, characterized in that: Multiple LED lights are arranged in a matrix, and the LED circuit also includes a first drive circuit and a second drive circuit. The microprocessor supplies power to multiple rows of LED lights in sequence through the first drive circuit, and drives part or all of the columns of LED lights in each row of LED lights to light up through the second drive circuit.

3. The passive LED driving circuit according to claim 1, characterized in that: The microprocessor controls different LED lamps in the LED circuit to light up in sequence.

4. The passive LED driving circuit according to claim 1, characterized in that: The passive LED driving circuit also includes: A DC-DC circuit, wherein the input end of the DC-DC circuit is connected to the output end of the power extraction and storage circuit, the DC-DC circuit can change the output voltage of the power extraction and storage circuit, and the output end of the DC-DC circuit is connected to the LED circuit and supplies power to the LED circuit.

5. The passive LED driving circuit according to claim 4, characterized in that: The output end of the DC-DC circuit is also connected to the microprocessor and supplies power to the microprocessor.

6. The passive LED driving circuit according to claim 1, characterized in that: The passive LED driving circuit also includes: The NFC chip is connected to the antenna circuit and wirelessly communicates with the mobile terminal through the antenna circuit. The microprocessor is connected to the NFC chip and obtains the control instruction sent by the mobile terminal through the NFC chip.

7. The passive LED driving circuit according to claim 1, characterized in that: The passive LED driving circuit also includes: An input circuit is connected to the microprocessor, and the input circuit can generate a control instruction according to an external trigger operation, so that the microprocessor changes the display of some of the LED lights in the LED circuit according to the control instruction.

8. The passive LED driving circuit according to claim 1, characterized in that: The power supply and storage circuit comprises: A matching circuit, connected to the antenna circuit and cooperating with the antenna circuit to output electrical energy; a rectifier circuit connected to the matching circuit and rectifying the electric energy output by the antenna circuit and the matching circuit; The energy storage circuit is connected to the rectifier circuit and stores the rectified electric energy; the energy storage circuit is also connected to the LED circuit and supplies power to the LED circuit.

9. A protective case for a mobile terminal, characterized in that: include: A housing, used for installation with a mobile terminal; A passive LED driving circuit is installed in the housing, and the passive LED driving circuit is the passive LED driving circuit according to any one of claims 1 to 8.

10. The protective case of the mobile terminal according to claim 9, characterized in that: The shell includes a back side facing away from the mobile terminal, and multiple LED lights of the passive LED driving circuit are arranged on the back side. The back side includes a display area, and the multiple LED lights are evenly arranged in the display area. The area of ​​the display area occupies more than 40% of the area of ​​the back side.

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