LED drive circuit, packaging structure and display screen

Abstract

The utility model provides an LED driving circuit, a packaging structure and a display screen. The LED driving circuit comprises at least one LED driving unit, a red LED wafer, a blue LED wafer and a green LED wafer. The LED driving unit comprises a first power supply module, a second power supply module and three LED mounting positions; a red LED wafer, a blue LED wafer and a green LED wafer are respectively mounted on one LED mounting position; the first power supply module is connected with the LED installation position where the red LED wafer is installed, the second power supply module is connected with the other two LED installation positions, and the power supply voltage value of the first power supply module is smaller than the power supply voltage value of the second power supply module. The first power supply module supplies power to the installation position of the red LED wafer, the second power supply module supplies power to the installation positions of the green LED wafer and the blue LED wafer, power is supplied through double-circuit power supply, the voltage value borne by the red LED wafer is smaller, the power supply voltage meets the reference value of the red LED wafer, the power consumption in the driving circuit is reduced, and the heating value in the circuit is reduced.

Description

Technical Field

[0001] This application relates to the field of LED technology, and particularly to an LED driving circuit, a packaging structure, and a display screen. Background Art

[0002] In the trend of modern technological development, LED (Light Emitting Diode) technology, as an energy-saving, environmentally friendly, and long-life lighting and display technology, has received extensive attention and applications. For surface-mounted device (SMD) LEDs, the LED chip and the LED driving chip are encapsulated together in an LED bracket. The conventional integrated lamp-driver chip has 3 channels, with each of the three colors R / G / B occupying one channel.

[0003] The existing LED driving circuit is powered by a power supply with a single voltage value. The red, green, and blue LED chips receive the same power supply, which is higher than the reference value of the red LED chip, resulting in a high heat generation of the red LED chip. Summary of the Utility Model

[0004] The technical problem to be solved by this application is that the existing LED driving circuit is powered by a power supply with a single voltage value. The red, green, and blue LED chips receive the same power supply, which is higher than the reference value of the red LED chip, resulting in a high heat generation of the red LED chip.

[0005] To solve the above problems, or at least partially solve the above technical problems, this application provides an LED driving circuit, a packaging structure, and a display screen.

[0006] In a first aspect, the present utility model discloses an LED driving circuit, which includes at least one LED driving unit, a red LED chip, a blue LED chip, and a green LED chip; [[ID=2,4]]<0,

[0007] The LED driving unit includes a first power supply module, a second power supply module, and three LED mounting positions. The red LED chip, the blue LED chip, and the green LED chip are respectively mounted on one of the LED mounting positions;

[0008] The first power supply module is connected to the LED mounting position where the red LED chip is mounted, the second power supply module is connected to the other two LED mounting positions, and the power supply voltage value of the first power supply module is less than the power supply voltage value of the second power supply module.

[0009] Preferably, the power supply voltage of the first power supply module is 2.8V - 3.2V, and the power supply voltage of the second power supply module is 3.8V - 4.2V.

[0010] Preferably, the LED driving unit includes a control module and a communication module. The control module is connected to the communication module, and the control module is connected to the LED mounting position.

[0011] Preferably, the communication module includes a signal input port and a signal output port;

[0012] Among two adjacent LED driving units, the signal input port of one LED driving unit is connected to the signal output port of the other LED driving unit.

[0013] Preferably, the communication module includes a backup signal port. Among two adjacent LED driving units, the backup signal port of one LED driving unit is connected to the signal input port of the other LED driving unit.

[0014] Preferably, the LED driving units are divided into a first LED driving unit, a second LED driving unit, and a third LED driving unit;

[0015] The signal output port of the first LED driving unit is connected to the signal input port of the second LED driving unit, and the signal output port of the second LED driving unit is connected to the signal input port of the third LED driving unit;

[0016] The signal input port of the first LED driving unit is connected to the backup signal port of the second LED driving unit, and the signal input port of the second LED driving unit is connected to the backup signal port of the third LED driving unit.

[0017] Preferably, the control module includes a driving module, and the driving module is respectively connected to the three mounting positions.

[0018] Preferably, the control module includes a processing module and a main control module. The processing module is connected to the main control module;

[0019] The main control module is connected to the communication module, and the processing module is connected to the driving module.

[0020] In a second aspect, the present invention discloses an LED packaging structure, which includes the LED driving circuit described in any one of the above.

[0021] In a third aspect, the present invention discloses an LED display screen, which includes an LED packaging structure described above.

[0022] The above technical solutions provided by this application have the following advantages compared with the prior art:

[0023] An LED driving circuit, a packaging structure and a display screen provided by the present application. In an LED driving circuit, three mounting positions are correspondingly arranged for each LED driving unit to mount LED chips of three colors, namely red, green and blue. The first power supply module and the second power supply module supply power to the LED mounting positions. The first power supply module supplies power to the mounting position of the red LED chip, and the second power supply module supplies power to the mounting positions of the green and blue LED chips. The supply voltage of the first power supply module is lower than that of the second power supply module. That is, by adopting dual-channel power supply, the voltage value received by the red LED chip is smaller, so that the supply voltage meets the reference value of the red LED chip, thereby reducing the power consumption in the driving circuit and reducing the heat generation in the circuit. Among them, the LED packaging structure adopts the LED driving circuit, so that the overall power consumption in the LED packaging mechanism is reduced and the heat generation is reduced. The above LED packaging structure is arranged in the LED display screen. The overall power consumption of the LED packaging structure is low, which can reduce the power consumption required by the display screen and achieve the purpose of energy saving of the device.

[0024] The supply voltage of the LED mounting position is reduced, so that the heat generation of the red LED chip is reduced and the temperature is lower. The heat dissipation requirements of the LED driving unit and the LED chip are also reduced accordingly, and more suitable brackets can be installed. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present invention and used together with the specification to explain the principles of the present invention.

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0027] Figure 1 It is a module diagram of an LED driving circuit provided by the present application;

[0028] Figure 2 It is a schematic structure of an LED driving circuit provided by the present application Figure 1 ;

[0029] Figure 3 It is a schematic structure of an LED driving circuit provided by the present application Figure 2 。

[0030] DESCRIPTION OF REFERENCE NUMERALS:

[0031] 1. LED driving circuit;

[0032] 11. LED driving unit; 12. Red LED chip; 13. Blue LED chip; 14. Green LED chip;

[0033] 111. Control module; 1111. Driving module; 1112. Processing module; 1113. Main control module;

[0034] 112. Communication module; 1121. Backup signal port; 1122. Signal input port; 1123. Signal output port;

[0035] 113. First power supply module;

[0036] 114. Second power supply module;

[0037] 115. LED mounting position. Detailed implementation manners

[0038] To make the objectives, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the accompanying drawings in this application. Obviously, the described embodiments are part of the embodiments of this application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application.

[0039] In a first aspect, referring to Figure 1-2 , this utility model discloses an LED driving circuit 1, which includes at least one LED driving unit 11, a red LED chip 12, a blue LED chip 13, and a green LED chip 14. The LED driving unit 11 drives the red LED chip 12, the blue LED chip 13, and the green LED chip 14 to emit light.

[0040] The LED driving unit 11 includes a control module 111, a communication module 112, a first power supply module 113, a second power supply module 114, and three LED mounting positions 115. The red LED chip 12, the blue LED chip 13, and the green LED chip 14 are respectively mounted on one of the LED mounting positions 115. The control module 111 is connected to the communication module 112, the control module 114 is connected to the LED mounting position 115, the first power supply module 113 is connected to the LED mounting position 115 where the red LED chip 12 is mounted, the second power supply module 114 is connected to the other two LED mounting positions 115, and the supply voltage value of the first power supply module 113 is less than the supply voltage value of the second power supply module 114.

[0041] Specifically, one LED driving unit 11 corresponds to one red LED chip 12, one green LED chip 14, and one blue LED chip 13, which are respectively installed on three LED mounting positions 115. The first power supply module 113 supplies power to the mounting position where the red LED chip 12 is installed, and the second power supply module 114 supplies power to the mounting positions where the blue and green LED chips 14 are installed. Since the reference voltage value of the red LED chip 12 is relatively small, being 2 - 2.2V, which is less than the reference voltage values of the blue and green LED chips 14, in order to reduce the heat generation of the red LED chip 12, it is necessary to make the supply voltage of the first power supply module 113 be at the reference voltage value of the red LED chip 12, so that the red LED chip 12 can be in a normal working state and avoid the increase in heat generation due to too high supply voltage. The control module 111 can control the operation of the mounting positions, and the communication module 112 receives and sends signals.

[0042] Among them, the mounting position is a pad, and the pad can be set on a bracket or a base, so that the LED chip can be welded on the pad.

[0043] It can be understood that the three mounting positions are used to install LED chips of three colors, red, green, and blue. The first power supply module 113 and the second power supply module 114 supply power to the LED mounting positions 115. The first power supply module 113 supplies power to the mounting position of the red LED chip 12, and the second power supply module 114 supplies power to the mounting positions of the green and blue LED chips 13. The supply voltage of the first power supply module 113 is lower than that of the second power supply module 114. That is, by adopting dual - path power supply, the voltage value received by the red LED chip is smaller, making the supply voltage meet the reference value of the red LED chip 12, thereby reducing the power consumption in the driving circuit and reducing the heat generation in the circuit. In addition, the supply voltage of the LED mounting position 115 is reduced, the heat generation of the red LED chip 12 is reduced, and the temperature is lower. The heat dissipation requirements of the LED driving unit 11 and the LED chip are also reduced accordingly. Therefore, ordinary brackets or bases can be used, and there are more suitable bracket types for installation.

[0044] Particularly, the supply voltage of the first power supply module 113 is 2.8V - 3.2V, and the supply voltage of the second power supply module 114 is 3.8V - 4.2V. Since the supply voltage of the first power supply module 113 is lower than the conventional 5V power supply, on average, it can save 28% - 32% power consumption compared with the conventional circuit.

[0045] Particularly, the LED driving unit 11 integrates the LS9001 chip, which has the function of power - off and resume transmission. The driving voltage is 3.3V - 5.5V, and the voltage it requires is lower than that of common driving chips, saving more energy.

[0046] The communication module 112 includes a backup signal port 1121, a signal input port 1122, and a signal output port 1123. Among two adjacent LED driving units 11, the signal input port 1122 of one LED driving unit 11 is connected to the signal output port 1123 of the other LED driving unit 11, and the backup signal port 1121 of one LED driving unit 11 is connected to the signal input port 1122 of the other LED driving unit 11.

[0047] The number of LED driving units 11 is set to be multiple. In this embodiment, the number of LED driving units 11 is set to three, which are divided into a first LED driving unit 11a, a second LED driving unit 11b, and a third LED driving unit 11c. However, the number of LED driving units 11 can be four, five, or more than six (as Figure 3 shown).

[0048] Specifically, the signal output port 1123 of the first LED driving unit 11a is connected to the signal input port 1122 of the second LED driving unit 11b, the signal output port 1123 of the second LED driving unit 11b is connected to the signal input port 1122 of the third LED driving unit 11c, the signal input port 1122 of the first LED driving unit 11a is connected to the backup signal port 1121 of the second LED driving unit 11b, and the signal input port 1122 of the second LED driving unit 11b is connected to the backup signal port 1121 of the third LED driving unit 11c.

[0049] All the LED driving units 11 are connected in series, and the LED chips are connected in series in cascade. The backup signal port 1121 of the LED driving unit 11 can back up the input signal of the signal input port 1122 of the current LED driving unit 11 and record the output signal of the signal output port 1123 of the previous LED driving unit 11. Among the series-connected LED driving units 11, if the signal input port 1122 of a certain LED driving unit 11 fails, the signal connected to the backup signal port 1121 can be switched to be transmitted to the next LED driving unit 11, thereby avoiding the situation that all driving units cannot be used due to the damage of a certain driving unit.

[0050] The control module 111 includes a driving module 1111, a processing module 1112, and a main control module 1113. The driving module 1111 is respectively connected to the three installation positions. The processing module 1112 is connected to the main control module 1113. The main control module 1113 is connected to the communication module 112. The processing module 1112 is connected to the driving module 1111.

[0051] Specifically, the main control module 1113 controls the operation of each module. The processing module 1112 is used to process the information for identifying the signals sent by the main control module 1113. The driving module 1111 receives the signals from the processing module 1112 and drives the operation and shutdown of the installation position and the LED chips on the installation position. The main control module 1113 transmits signals to the outside through the communication module 112.

[0052] In a second aspect, the present utility model discloses an LED packaging structure, which includes the above-mentioned LED driving circuit 1, a potting member, and a bracket. On the LED driving circuit 1, red LED chips 12, green LED chips 14, and blue LED chips 13 are installed on the installation position, and the installation position is set on the bracket. That is, the LED chips of the three colors are directly installed on the bracket, and the LED driving circuit 1 is also installed on the bracket. Then, by performing a glue injection process on the bracket, after the potting member is cured, the potting member wraps the LED chips, and the light emitted by the LED chips passes through the potting member and irradiates to the outside.

[0053] Among them, the LED packaging structure adopts the LED driving circuit 1. In the LED driving circuit 1, dual-voltage power supply is adopted by the first power supply module 113 and the second power supply module 114, so that the voltage applied to the red LED chips 12 is at the reference value, reducing the overall power consumption in the LED packaging mechanism and avoiding the increase in heat generation. Further, when the amount of heat generation becomes smaller, the current value is appropriately increased to improve the luminous brightness of the LED chips.

[0054] Optionally, the bracket adopts a TOP-type bracket or a CHIP-type bracket. In this embodiment, the bracket adopts a TOP-type bracket, but the bracket is not limited to the TOP-type bracket adopted in this embodiment.

[0055] As an embodiment, the potting member is epoxy resin glue. After the LED chips are fixed on the bracket, the potting member is poured onto the bracket, so that the LED chips are wrapped by the transparent epoxy resin glue. After the potting member is cured, it plays the roles of waterproofing, dustproofing, insulation, heat conduction, and shockproofing. Moreover, the epoxy resin glue is transparent and has good light transmittance, which can avoid affecting the light-emitting effect of the LED chips.

[0056] In a third aspect, the present utility model discloses an LED display screen, which includes the above-mentioned LED packaging structure, and internally sets multiple LED driving units 11 and multiple three-color LED chips. One LED driving unit corresponds to three LED chips of different colors. Since the power supply voltage of the driving circuit corresponding to the red LED chips 12 is lower than the power supply voltages of the other two-color LED chips, the power consumption of the chips becomes smaller and the heat generation is reduced. The above-mentioned LED packaging structure is used for packaging and setting inside the LED display screen, and dual-voltage power supply is adopted inside, so that the power consumption of the red LED chips 12 is reduced and the heat generation is reduced, thereby controlling the internal temperature of the product within a certain range.

[0057] That is, the overall power consumption of the adopted LED packaging structure is low, which can reduce the power consumption required by the display screen, and can achieve the purpose of energy saving of the device. Further, on the premise of low power consumption and low heat generation, the current can be appropriately increased to improve the brightness of the display screen. Further, the heat generation inside the display screen is reduced, the temperature is lowered, and the stability of the product is enhanced.

[0058] In the above embodiments, the descriptions of each embodiment have their own emphases. For the parts not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0059] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0060] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "plurality" means two or more unless otherwise specifically defined.

[0061] In the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", "connected to", "fixed" and other terms should be understood in a broad sense. For example, it can be a connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may also include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than that of the second feature.

[0063] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0064] Obviously, those skilled in the art can make various changes and modifications to the present utility model without departing from the spirit and scope of the present utility model. Thus, if these modifications and variations of the present utility model fall within the scope of the claims of the present utility model and their equivalent technologies, the present utility model also intends to include these changes and modifications therein.

[0065] As described above, this is the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims

1. An LED driving circuit, characterized in that: Includes at least one LED driving unit, a red LED wafer, a blue LED wafer, and a green LED wafer; The LED driving unit includes a first power supply module, a second power supply module and three LED mounting positions, and the red LED wafer, the blue LED wafer and the green LED wafer are respectively mounted on one of the LED mounting positions; The first power supply module is connected to the LED mounting position where the red LED wafer is mounted, and the second power supply module is connected to the other two LED mounting positions. The supply voltage value of the first power supply module is smaller than the supply voltage value of the second power supply module.

2. The LED driving circuit according to claim 1, wherein: The supply voltage of the first power supply module is 2.8V-3.2V, and the supply voltage of the second power supply module is 3.8V-4.2V.

3. The LED driving circuit according to claim 1, wherein: The LED driving unit includes a control module and a communication module. The control module is connected to the communication module, and the control module is connected to the LED installation position.

4. The LED driving circuit according to claim 3, characterized in that: The communication module includes a signal input port and a signal output port; In two adjacent LED driving units, the signal input port of one LED driving unit is connected to the signal output port of the other LED driving unit.

5. The LED driving circuit according to claim 3, wherein: The communication module includes a backup signal port. Among two adjacent LED driving units, the backup signal port of one LED driving unit is connected to the signal input port of the other LED driving unit.

6. The LED driving circuit according to claim 5, characterized in that: The LED driving unit is divided into a first LED driving unit, a second LED driving unit, and a third LED driving unit; The signal output port of the first LED driving unit is connected to the signal input port of the second LED driving unit, and the signal output port of the second LED driving unit is connected to the signal input port of the third LED driving unit; The signal input port of the first LED driving unit is connected to the backup signal port of the second LED driving unit, and the signal input port of the second LED driving unit is connected to the backup signal port of the third LED driving unit.

7. The LED driving circuit according to claim 3, characterized in that: The control module includes a driving module, and the driving modules are respectively connected to the three installation positions.

8. The LED driving circuit according to claim 7, characterized in that: The control module includes a processing module and a main control module, and the processing module is connected to the main control module; The main control module is connected to the communication module, and the processing module is connected to the driving module.

9. An LED packaging structure, characterized in that: The LED driving circuit comprises the LED driving circuit according to any one of claims 1 to 8.

10. An LED display screen, characterized in that: The LED packaging structure includes the LED packaging structure described in claim 9.

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