An LED lamp bead structure, a PCB board, an LED display module and an LED display screen

Abstract

This utility model discloses an LED chip structure, a PCB board, an LED display module, and an LED display screen. The LED chip structure encapsulates a red light chip, a green light chip, and a blue light chip. The positive and / or negative terminals of the red, green, and blue light chips of every two chips share a single pin. Each pair of chips contains six pins, and the positive and / or negative terminals sharing the single pin are connected via a connecting wire. Each pair of chips is soldered onto the PCB board using these six pins. The PCB board has pads corresponding to the number of pins in each pair of chips. By merging the positive or negative terminals of the LED chip into a single pin, the number of pins in the LED chip is reduced, increasing the push force and mounting speed, while simultaneously meeting the development needs of miniaturization and integration.

Description

Technical Field

[0001] This utility model relates to the field of LED lamp bead technology, specifically to an LED lamp bead structure, a PCB board, an LED display module, and an LED display screen. Background Technology

[0002] Currently, LED chips are widely used in various electronic devices, lighting products, and display screens. In a conventional LED chip design, three different colored light-emitting chips—red, green, and blue—are typically encapsulated within a single chip to emit the three basic colors of light: red, blue, and green. These colors are then mixed to create a rich variety of colors.

[0003] Each light-emitting chip has two electrodes, a positive electrode and a negative electrode. In the traditional LED lamp bead structure, for the common anode or common cathode structure of the upright chip, as well as the common anode structure of the flip chip, the electrode connection method of the three light-emitting chips in a lamp bead makes a lamp bead contain four electrodes (three positive electrodes and one combined negative electrode, or three negative electrodes and one combined positive electrode), which is commonly referred to as having four pins.

[0004] As electronic devices trend towards miniaturization and integration, and with ever-increasing demands for production efficiency and product performance, the traditional four-pin design for each LED chip is gradually revealing some problems. The large number of pins not only occupies significant PCB space, hindering miniaturization, but also increases placement difficulty during the mounting process, leading to lower placement rates and hindering production efficiency. Furthermore, the increased pin count may complicate connections and affect the push force between pins, thus impacting the stability and reliability of the connection between the LED chip and the PCB.

[0005] Therefore, those skilled in the art urgently need to develop a new technical solution to address the above problems. Utility Model Content

[0006] To overcome the problems existing in related technologies, this utility model discloses an LED lamp bead structure, a PCB board, an LED display module, and an LED display screen.

[0007] According to a first aspect of the present invention, an LED lamp bead structure is provided, wherein the LED lamp bead is a structure in which two lamp beads are packaged together;

[0008] Each LED chip includes a red light chip, a green light chip, and a blue light chip. The positive and / or negative terminals of the red, green, and blue light chips of two LED chips packaged together share a pin. Each pair of LED chips contains six pins, and the positive and / or negative terminals of the shared pin are connected by a connecting wire.

[0009] Two LEDs are soldered to the PCB board via the six pins, and the PCB board has pads corresponding to the number of pins of the two LEDs.

[0010] Optionally, in every two LEDs, the positive terminals of the red, green, and blue LED chips of each LED share a single pin, which serves as the first and second pins, respectively.

[0011] The negative terminals of the red LED chips of every two LEDs share a single pin, which serves as the third pin.

[0012] The negative terminals of the green LED chips of every two LEDs share a single pin, which serves as the fourth pin.

[0013] The negative terminals of the blue light chips of every two LEDs share a single pin, which is used as the fifth pin.

[0014] Each pair of LEDs also includes a sixth pin, and the first, second, third, fourth, fifth, and sixth pins form a symmetrical structure.

[0015] Optionally, in every two LEDs, the negative terminals of the red, green, and blue LED chips of each LED share a single pin, which serves as the first and second pins, respectively.

[0016] The positive terminal of the red light chip of each pair of LEDs shares a pin, which is used as the third pin;

[0017] The green light chip of every two LEDs shares a pin, which is used as the fourth pin;

[0018] The positive terminal of the blue light chip of each pair of LEDs shares a pin, which is used as the fifth pin;

[0019] Each pair of LEDs also includes a sixth pin, and the first, second, third, fourth, fifth, and sixth pins form a symmetrical structure.

[0020] Optionally, in every two LED chips, the chip electrode with a common positive electrode is connected to the common positive electrode of the bracket via a connecting wire, and the chip electrode with a common negative electrode is connected to the common negative electrode of the bracket via a connecting wire.

[0021] The bracket is soldered to a common pin via the conductive layer of the bracket, and the pin is soldered to the pads on the PCB board.

[0022] Optionally, the length of the connecting line is greater than the length of the conventional connecting line corresponding to chips that do not share a positive or negative electrode.

[0023] Optionally, the curvature of the connecting line is greater than the curvature of the conventional connecting line corresponding to chips that do not share a positive or negative electrode.

[0024] According to a second aspect of the present invention, a PCB board is provided, the PCB board including a plurality of pads;

[0025] In the aforementioned number of pads, every six pads are corresponding to two LED structures;

[0026] The six pins of the two LED structures are soldered onto six pads respectively.

[0027] Optionally, the pad area of ​​the PCB board is 1.2m-1.3m, where m is the area of ​​a conventional pad corresponding to the LED chip structure pins that do not share a positive or negative electrode.

[0028] According to a third aspect of the present invention, an LED display module is provided, the LED display module including the LED bead structure described in the first aspect of the present invention and the PCB board designed corresponding to the LED bead structure as described in the second aspect of the present invention.

[0029] According to a fourth aspect of the present invention, an LED display screen is provided, the LED display screen comprising the LED display module described in the third aspect of the present invention.

[0030] In summary, this utility model discloses an LED chip structure, a PCB board, an LED display module, and an LED display screen. The LED chip structure encapsulates a red light chip, a green light chip, and a blue light chip. The positive and / or negative terminals of the red, green, and blue light chips of every two chips share a single pin. Each pair of chips contains six pins, and the positive and / or negative terminals sharing the single pin are connected via connecting wires. Each pair of chips is soldered onto the PCB board using these six pins. The PCB board has pads corresponding to the number of pins in each pair of chips. By merging the positive or negative terminals of the LED chip into a single pin, the number of pins in the chip is reduced, increasing the push force and mounting speed of the chips, while simultaneously meeting the development needs of miniaturization and integration.

[0031] In addition, by increasing the length and curvature of the connecting wires, heat dissipation and light efficiency are enhanced, connecting wire breakage is prevented, and overall thrust is increased. Attached Figure Description

[0032] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0033] Figure 1 This is a schematic diagram of a common anode structure for a two-in-one LED chip according to an exemplary embodiment;

[0034] Figure 2 It is based on Figure 1 The diagram shows a structure of a flip-chip common anode two-in-one LED chip;

[0035] Figure 3 It is based on Figure 1 The diagram shows a common anode structure of a conventional LED chip.

[0036] Figure 4 It is based on Figure 1 The diagram shows a common anode structure for a conventional flip-chip LED.

[0037] Figure 5 This is a schematic diagram of another common cathode structure of a two-in-one LED chip according to an exemplary embodiment;

[0038] Figure 6 It is based on Figure 5 The diagram shows a conventional flip-chip common cathode structure for LED chips.

[0039] Figure 7 This is a schematic diagram of the curvature of a gold wire according to an exemplary embodiment. Detailed Implementation

[0040] The specific embodiments disclosed herein will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this disclosure.

[0041] This utility model discloses an LED lamp bead structure, which is a structure in which two lamp beads are packaged together; each lamp bead includes: a red light chip, a green light chip and a blue light chip, the positive and / or negative terminals of the red light chip, green light chip and blue light chip of each pair of lamp beads packaged together share a pin, each pair of lamp beads contains six pins, and the positive and / or negative terminals of the shared pin are connected by gold wire; each pair of lamp beads is soldered to a PCB board through six pins, and the PCB board is provided with pads corresponding to the number of pins of the two lamp beads.

[0042] For example, typically, an LED chip contains three different colored light-emitting chips: a red chip, a green chip, and a blue chip, which can emit red, blue, and green light respectively. Each light-emitting chip contains a positive electrode and a negative electrode. Within a single LED chip, the negative electrodes of these three chips are connected together, while the positive electrodes are independent of each other. Therefore, an LED chip contains a total of four electrodes (three positive electrodes and one combined negative electrode), which is commonly referred to as having four pins.

[0043] The technical solution disclosed in this utility model connects the independent positive or negative electrodes (or the positive electrodes of three light-emitting chips connected together while the negative electrodes are independent) in a conventional LED chip structure via a connecting wire, allowing them to share a single pin. This reduces the number of pins for a single LED chip, improving push force and mounting speed. When the independent electrodes of two LED chips are connected together, and the two LED chips are packaged together, it is called a two-in-one LED chip. Each two-in-one LED chip contains six pins (less than the eight pins in conventional technology) and is soldered onto the PCB board.

[0044] Figure 1 This is a schematic diagram illustrating a common anode structure of a two-in-one LED chip according to an exemplary embodiment, such as... Figure 1 As shown, in every two LEDs, the positive terminals of the red, green, and blue LED chips of each LED share a pin, which serves as the first and second pins, respectively; the negative terminals of the red LED chips of every two LEDs share a pin, which serves as the third pin; the negative terminals of the green LED chips of every two LEDs share a pin, which serves as the fourth pin; the negative terminals of the blue LED chips of every two LEDs share a pin, which serves as the fifth pin; and every two LEDs also include a sixth pin. The first, second, third, fourth, fifth, and sixth pins form a symmetrical structure.

[0045] For example, in Figure 1The 2-in-1 LED chip shown uses a common anode structure with upright chips. Specifically, in each individual LED chip, the positive terminals of the red, green, and blue LED chips share a single pin. The 2-in-1 LED chip contains two common anodes, designated as pin 1 (C1) and pin 2 (C2). The negative terminals of the red LED chips in both chips share a single pin, designated as pin 3 (R12); the negative terminals of the green LED chips in both chips share a single pin, designated as pin 4 (G12); and the negative terminals of the blue LED chips in both chips share a single pin, designated as pin 5 (B12). Additionally, each 2-in-1 LED chip includes a sixth pin. These six pins are symmetrically arranged and correspond to six pads on the PCB board. The six pins mentioned above are designed symmetrically (a common design pattern for LED chip pins). Similarly, the pads on the PCB corresponding to the pins are also symmetrically designed. The pins are fixed to the pads with solder paste (SMT: Surface Mount Technology) to ensure consistent push force on both sides of the symmetrically designed LED chip. This prevents uneven damage to the chips due to collisions caused by inconsistent push force on different surfaces within a module, which would lead to greater maintenance difficulties. Without a symmetrical pad and pin structure, the asymmetrical pads would require continuous skipping of blank areas when applying solder paste, creating difficulties in consistent operation and placing higher demands on both the machine and the operator.

[0046] Figure 2 A schematic diagram of a flip-chip common anode structure is also provided. Figure 2 A single 2-in-1 LED still contains six pins, corresponding to six pads on the PCB board. Figure 3 and Figure 4 This shows the common anode LED structure of conventional chip and flip chip in the prior art. It can be seen that the positive terminals of the three chips in each LED share a pin, while the negative terminals of the three chips are independent pins, that is, one LED corresponds to four pins.

[0047] Figure 5 This is a schematic diagram illustrating another common cathode structure of a two-in-one LED chip according to an exemplary embodiment, as shown below. Figure 5 As shown, in every two LEDs, the negative terminals of the red, green, and blue LED chips share a single pin, designated as the first and second pins, respectively. The positive terminals of the red LED chips in every two LEDs share a single pin, designated as the third pin; the positive terminals of the green LED chips in every two LEDs share a single pin, designated as the fourth pin; and the positive terminals of the blue LED chips in every two LEDs share a single pin, designated as the fifth pin. Similarly, every two LEDs also include a sixth pin, forming a symmetrical structure with the first, second, third, fourth, fifth, and sixth pins.

[0048] For example, in Figure 5The 2-in-1 LED chip shown uses a common cathode structure with upright chips. Specifically, in each individual LED chip, the negative terminals of the red, green, and blue LED chips share a single pin. The 2-in-1 LED chip contains two common cathodes, designated as pin 1 (C1) and pin 2 (C2). The positive terminals of the red LED chips in both chips share a single pin, designated as pin 3 (R12); the positive terminals of the green LED chips in both chips share a single pin, designated as pin 4 (G12); and the positive terminals of the blue LED chips in both chips share a single pin, designated as pin 5 (B12). Additionally, each 2-in-1 LED chip includes a sixth pin. These six pins are symmetrically arranged and correspond to six pads on the PCB board. Figure 6 This shows the existing common cathode chip lamp bead structure. It can be seen that the negative terminals of the three chips in each lamp bead share a pin, while the positive terminals of the three chips are independent pins, that is, one lamp bead corresponds to 4 pins.

[0049] In addition, in every two LED chips, the chip electrode with the common positive electrode is connected to the common positive electrode of the bracket via a connecting wire, and the chip electrode with the common negative electrode is connected to the common negative electrode of the bracket via a connecting wire; the bracket is soldered to the common pin through the conductive layer of the bracket, and the pin is soldered to the pads on the PCB board.

[0050] Preferably, the connecting wire is a gold wire, which has high reliability and corrosion resistance and is commonly used in LED chip structures. Alternatively, the connecting wire can also be copper wire, silver-clad copper wire, silver wire, alloy wire, etc. In terms of cost, copper wire / silver-clad copper wire < alloy wire < gold wire < silver wire; in terms of reliability, gold wire > alloy wire > silver wire > copper wire / silver-clad copper wire; in terms of conductivity, silver wire > gold wire > copper wire > alloy wire; and in terms of corrosion resistance, gold wire > alloy wire > silver-clad copper wire > copper wire.

[0051] For example, it can be understood that the light-emitting principle of an LED chip is as follows: current flows from the PCB board through the pins into the bracket, and then through the connecting wires to the chip electrodes, ensuring that the LED chip emits light. Therefore, chip electrodes that share a common positive or negative terminal need to be connected to the bracket through connecting wires, and the conductive layer of the bracket is soldered to the common pins.

[0052] Furthermore, the length of the connecting wire is greater than the length of the conventional connecting wire for chips that do not share a common positive or negative terminal, and the curvature of the connecting wire is also greater than that of the conventional connecting wire for chips that do not share a common positive or negative terminal. Increasing the length of the connecting wire enhances heat dissipation and light efficiency, prevents the connecting wire (gold wire) from breaking, and also... Figure 7 As shown, increasing the curvature of the gold thread can enhance the overall thrust.

[0053] The present invention also includes a PCB board, which includes a plurality of pads; in the plurality of pads, every six pads are correspondingly arranged with two LED structures; the six pins of the two LED structures are respectively soldered on the six pads, and the design is corresponding to the LED structure, with the six pads having a left-right symmetrical structure.

[0054] Furthermore, the PCB board pad area is 1.2m-1.3m, where m is the standard pad area for LED chip pins without a shared positive or negative terminal. Since the pins soldered to the pads share a positive / negative terminal, the pad area needs to be appropriately increased, for example, by 20%-30%, but usually not exceeding twice the standard pad area.

[0055] The present invention also discloses an LED display module, which includes an LED bead structure and a PCB board designed accordingly.

[0056] The present invention also discloses an LED display screen, which includes the LED display module.

[0057] In summary, this utility model discloses an LED chip structure, a PCB board, an LED display module, and an LED display screen. The LED chip structure encapsulates a red light chip, a green light chip, and a blue light chip. The positive and / or negative terminals of the red, green, and blue light chips of every two chips share a single pin. Each pair of chips contains six pins, and the positive and / or negative terminals sharing the single pin are connected via connecting wires. Each pair of chips is soldered onto the PCB board using these six pins. The PCB board has pads corresponding to the number of pins in each pair of chips. By merging the positive or negative terminals of the LED chip into a single pin, the number of pins in the chip is reduced, increasing the push force and mounting speed of the chips, while simultaneously meeting the development needs of miniaturization and integration.

[0058] In addition, by increasing the length and curvature of the connecting wires, heat dissipation and light efficiency are enhanced, connecting wire breakage is prevented, and overall thrust is increased.

[0059] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0060] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0061] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. An LED lamp bead structure, characterized in that, The LED bead is a structure in which two LED beads are packaged together; Each LED chip includes a red light chip, a green light chip, and a blue light chip. The positive and / or negative terminals of the red, green, and blue light chips of two LED chips packaged together share a pin. Each pair of LED chips contains six pins, and the positive and / or negative terminals of the shared pin are connected by a connecting wire. Two LEDs are soldered to the PCB board via the six pins, and the PCB board has pads corresponding to the number of pins of the two LEDs.

2. The LED lamp bead structure according to claim 1, characterized in that, In every two LEDs, the positive terminals of the red, green, and blue LED chips of each LED share a single pin, which serves as the first and second pins, respectively. The negative terminals of the red LED chips of every two LEDs share a single pin, which serves as the third pin. The negative terminals of the green LED chips of every two LEDs share a single pin, which serves as the fourth pin. The negative terminals of the blue light chips of every two LEDs share a single pin, which is used as the fifth pin. Each pair of LEDs also includes a sixth pin, and the first, second, third, fourth, fifth, and sixth pins form a symmetrical structure.

3. The LED lamp bead structure according to claim 1, characterized in that, In every two LEDs, the negative terminals of the red, green, and blue LED chips of each LED share a single pin, which serves as the first and second pins, respectively. The positive terminal of the red light chip of each pair of LEDs shares a pin, which is used as the third pin; The green light chip of every two LEDs shares a pin, which is used as the fourth pin; The positive terminal of the blue light chip of each pair of LEDs shares a pin, which is used as the fifth pin; Each pair of LEDs also includes a sixth pin, and the first, second, third, fourth, fifth, and sixth pins form a symmetrical structure.

4. The LED lamp bead structure according to claim 1, characterized in that, In each pair of LED chips, the chip electrode with a shared positive electrode is connected to the common positive electrode of the bracket via a connecting wire, and the chip electrode with a shared negative electrode is connected to the common negative electrode of the bracket via a connecting wire. The bracket is soldered to a common pin via the conductive layer of the bracket, and the pin is soldered to the pads on the PCB board.

5. The LED lamp bead structure according to claim 4, characterized in that, The length of the connecting line is greater than the length of the conventional connecting line for chips that do not share a positive or negative electrode.

6. The LED lamp bead structure according to claim 4, characterized in that, The curvature of the connecting line is greater than that of the conventional connecting line corresponding to chips that do not share a positive or negative terminal.

7. A PCB board, characterized in that, The PCB board includes several solder pads; In the aforementioned number of pads, every six pads are corresponding to two LED structures; The six pins of the two LED structures are soldered onto six pads respectively.

8. The PCB board according to claim 7, characterized in that, The pad area of ​​the PCB board is 1.2m-1.3m, where m is the conventional pad area corresponding to the LED chip structure pins that do not share a positive or negative electrode.

9. An LED display module, characterized in that, The LED display module includes the LED bead structure as described in any one of claims 1-6 and the PCB board designed corresponding to the LED bead structure as described in any one of claims 7-8.

10. An LED display screen, characterized in that, The LED display screen includes the LED display module as described in claim 9.

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