Two-in-one LED lamp bead structure, preparation method thereof and display screen

Abstract

The invention relates to the technical field of LEDs, and discloses a two-in-one LED lamp bead structure and a preparation method thereof, and a display screen, the two-in-one LED lamp bead structure comprises a support, the support comprises a horizontally arranged substrate, a light emitting unit arranged on the front surface of the substrate, a metal functional area arranged on the front surface of the substrate, and a pin area arranged on the back surface of the substrate, the light-emitting unit comprises a first light-emitting unit and a second light-emitting unit, each of the first light-emitting unit and the second light-emitting unit comprises a red light chip, a green light chip and a blue light chip, and the first light-emitting unit and the second light-emitting unit are electrically connected. The first light-emitting unit or the second light-emitting unit comprises a counter electrode chip, the first light-emitting unit is in common cathode connection, and the second light-emitting unit is in common anode connection. By implementing the application, accurate maintenance can be realized, heat during working of the lamp beads can be reduced, the display effect of the display screen can be improved, and the service life of the lamp beads can be prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of LEDs, and particularly to a two-in-one LED lamp bead structure, a preparation method thereof, and a display screen. Background Art

[0002] With the increasingly wide application of display screen technology, the application scenarios are gradually diversified. Among them, RGB display movie screens show a rapid growth trend, and the technology is also constantly advancing. It is expected that RGB display movie screens will have more application fields and occupy a broader market share in the future. The development of RGB display movie screens benefits from continuous technological progress and innovation, especially in LED display technology, and its application in the film and television market has rapidly expanded. The advantages of LED movie screens include technical advantages such as high brightness, ultra-high contrast, and good color consistency, enabling them to completely replace traditional projectors and providing diverse projection technologies and product choices for the industry and audiences. Currently, the lamp beads used in RGB display movie screens are mainly indoor RGB lamp beads. Currently, the mainstream indoor lamp beads use black shell PPA brackets with RGB configurations, mainly including indoor LED single lamp beads and indoor LED two-in-one lamp beads. Both indoor LED single lamp beads and indoor LED two-in-one lamp beads use die bonding glue to fix the RGB lamp beads in the die bonding area of the bracket, and use bonding wires to connect the chips and bonding wires to make the lamp beads electrically connected; then dot and seal the glue, and use encapsulation glue to protect the exposed chips and bonding wires of the lamp beads; form RGB lamp beads through blanking, and finally grade the lamp beads through spectroscopy into lamp bead products required by customers.

[0003] Early indoor LED single lamp beads usually adopted a single RGB solid soldering functional area planar and outer lead structure. Specifically, as Figures 1-3 shown, the lamp bead is a group of RGB lamp bead structures, and the pins are a combination of 4 pins, namely red, green, blue polarities and a common polarity. The anti-collision ability of the lamp bead is weak, and the lamp bead size is limited in design and cannot be designed to be smaller. Moreover, the client PCB design circuit is determined according to the number of lamp bead pins, which will result in a large number of circuit lines.

[0004] Early indoor LED two-in-one lamp beads usually adopt a planar and outer-lead structure with two RGB soldering functional areas. Specifically, the lamp bead is a two-group RGB lamp bead structure, and the pins are a combination of 8 pins, namely two groups of red, green, and blue polarities and two common polarities. The number of pins is relatively large, which can improve the anti-collision ability of the lamp bead. However, the individual pins are short, and it is not easy to make the pins flat, affecting the overall consistency of the product. In addition, both groups of RGB in the existing two-in-one lamp beads are common anodes. After the lamp beads of the common anode are attached to the screen, they generate more heat than the common cathode lamp beads, so the temperature of the entire display screen is relatively high, affecting the service life of the lamp beads. In addition, during the use of the lamp beads, short circuits may occur due to the infiltration of water vapor or metal migration short circuits. Moreover, one pin of the display screen module IC controls multiple lamp beads at the same time, making it difficult to determine the faulty lamp beads during subsequent maintenance, affecting the maintenance efficiency and the display effect of the display screen. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a two-in-one LED lamp bead structure and its preparation method, which can achieve precise maintenance, reduce the temperature of the lamp bead during operation, and extend the service life of the lamp bead.

[0006] The technical problem to be solved by the present invention is to provide a display screen with good display effect and long service life.

[0007] To solve the above technical problems, the first aspect of the present invention provides a two-in-one LED lamp bead structure, including:

[0008] A bracket, the bracket includes a horizontally arranged substrate;

[0009] A light-emitting unit installed on the front surface of the substrate, the light-emitting unit includes a first light-emitting unit and a second light-emitting unit. The first light-emitting unit includes a first red light chip, a first green light chip, and a first blue light chip. The second light-emitting unit includes a second red light chip, a second green light chip, and a second blue light chip. The first light-emitting unit and the second light-emitting unit are electrically connected. The first light-emitting unit or the second light-emitting unit contains an anti-electrode chip. The first light-emitting unit is connected in a common cathode manner, and the second light-emitting unit is connected in a common anode manner;

[0010] A metal functional area provided on the front surface of the substrate, and the light-emitting unit is electrically connected to the metal functional area;

[0011] A pin area provided on the back surface of the substrate, and the pin area is electrically connected to the metal functional area;

[0012] An encapsulation glue layer that wraps the substrate and the light-emitting unit.

[0013] As an improvement of the above solution, the second red light chip is an anti-electrode chip.

[0014] As an improvement of the above solution, six metal functional areas are provided on the front side of the substrate, namely the first metal functional area, the second metal functional area, the third metal functional area, the fourth metal functional area, the fifth metal functional area, and the sixth metal functional area;

[0015] The first red light chip is fixed to the second metal functional area, the second blue light chip is fixed to the third metal functional area, the first green light chip and the second green light chip are fixed to the fourth metal functional area, the first blue light chip is fixed to the fifth metal functional area, the second red light chip is fixed to the sixth metal functional area, and the first metal functional area and the sixth metal functional area are electrically connected.

[0016] As an improvement of the above solution, the negative electrodes of the first red light chip, the first green light chip, and the first blue light chip share the second metal functional area to form a common cathode;

[0017] The positive electrode of the second red light chip is connected to the first metal functional area, and the positive electrodes of the second blue light chip and the second green light chip share the sixth metal functional area to form a common anode.

[0018] As an improvement of the above solution, the positive electrode of the first red light chip is connected to the negative electrode of the second blue light chip; the positive electrode of the first green light chip is connected to the negative electrode of the second green light chip; the positive electrode of the first blue light chip is connected to the positive electrode of the second red light chip.

[0019] As an improvement of the above solution, the second metal functional area is L-shaped;

[0020] The light-emitting unit and the metal functional area are electrically connected by bonding wires.

[0021] As an improvement of the above solution, the metal functional area passes through the side wall of the substrate and is connected to the pin area, and the pins in the pin area penetrate the bottom of the bracket;

[0022] The pin area includes a first pin, a second pin, a third pin, a fourth pin, a fifth pin, and a sixth pin. The first pin is connected to the first metal functional area, the second pin is connected to the second metal functional area, the third pin is connected to the third metal functional area, the fourth pin is connected to the fourth metal functional area, the fifth pin is connected to the fifth metal functional area, and the sixth pin is connected to the sixth metal functional area.

[0023] As an improvement of the above solution, the first light-emitting unit is arranged in a straight line along the first direction, the second light-emitting unit is arranged in a straight line along the first direction, the first light-emitting unit and the second light-emitting unit are arranged side by side along the second direction, and are arranged asymmetrically.

[0024] The second aspect of the present invention also provides a preparation method for the above-mentioned integrated LED lamp bead structure, including:

[0025] Providing a metal plate and processing it to form a bracket with a substrate;

[0026] Forming a metal functional area on the front surface of the substrate;

[0027] Fixing a light-emitting unit on the front surface of the substrate so that the light-emitting unit is connected to the metal functional area;

[0028] Bending the back surface of the substrate to form a pin area and electrically connecting the pin area and the metal functional area;

[0029] Wrapping the surfaces of the substrate and the light-emitting unit to form a packaging glue layer.

[0030] The second aspect of the present invention also provides a display screen, including the above-mentioned integrated LED lamp bead structure. Implementing the present invention has the following beneficial effects:

[0031] In this application, through the design of the lamp bead structure, a reverse electrode chip is added to the light-emitting unit. When the current of a single lamp bead in the display screen module is not high, by using the reverse cut-off of the RGB chip, an integrated LED lamp bead containing a common cathode and a common anode is obtained. Compared with the traditional integrated lamp bead structure with two common anodes, it can reduce the heat generated during the operation of the lamp bead, lower the temperature during the operation of the lamp bead, improve the display effect of the display screen, extend the service life of the lamp bead, and can control the two groups of light-emitting units to work independently. When a short circuit occurs in the integrated lamp bead, the faulty light-emitting chip can be accurately determined by first lighting the first light-emitting unit of the common anode and then the second light-emitting unit of the common cathode, thereby achieving accurate maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 : Schematic diagram of the front structure of an LED single lamp bead in the prior art;

[0033] Figure 2 : Schematic diagram of the back structure of an LED single lamp bead in the prior art;

[0034] Figure 3 : Schematic diagram of the cross-sectional structure of an LED single lamp bead in the prior art;

[0035] Figure 4 : Schematic diagram of the front structure of an LED integrated lamp bead in the prior art;

[0036] Figure 5 : Schematic diagram of the back structure of an LED integrated lamp bead in the prior art;

[0037] Figure 6: Schematic cross-sectional structure diagram of an LED two-in-one lamp bead in the prior art;

[0038] Figure 7 : Front structure schematic diagram of the two-in-one LED lamp bead structure in the present invention;

[0039] Figure 8 : Back structure schematic diagram of the two-in-one LED lamp bead structure in the present invention;

[0040] Figure 9 : Schematic cross-sectional structure diagram of the two-in-one LED lamp bead structure in the present invention;

[0041] Figure 10 : Schematic circuit diagram of the two-in-one LED lamp bead structure in the present invention.

[0042] Reference numerals:

[0043] 1 - Bracket; 11 - Substrate; 2 - First light-emitting unit; 21 - First red light chip (R1); 22 - First green light chip (G1); 23 - First blue light chip (B1); 3 - Second light-emitting unit; 31 - Second red light chip (R2); 32 - Second green light chip (G2); 33 - Second blue light chip (B2); 4 - Metal functional area; 41 - First metal functional area; 42 - Second metal functional area; 43 - Third metal functional area; 44 - Fourth metal functional area; 45 - Fifth metal functional area; 46 - Sixth metal functional area; 5 - Pin area; 51 - First pin; 52 - Second pin; 53 - Third pin; 54 - Fourth pin; 55 - Fifth pin; 56 - Sixth pin; 6 - Encapsulation glue layer. Detailed implementation manners

[0044] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail with specific embodiments below.

[0045] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "left", "right", "top", "bottom", etc. are based on the orientation or positional relationships shown in the drawings, and are 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, and thus should not be construed as a limitation to the present invention.

[0046] In the description of the present invention, it should be noted that, unless otherwise clearly specified and defined, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. 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.

[0047] To solve the above problems, the present invention provides a two-in-one LED lamp bead structure. Please refer to Figures 7-10 , including: a bracket 1, the bracket 1 includes a horizontally arranged substrate 11, a light-emitting unit mounted on the front surface of the substrate 11, a metal functional area 4 provided on the front surface of the substrate 11, a pin area 5 provided on the back surface of the substrate 11, and a packaging glue layer 6 that wraps the substrate 11 and the light-emitting unit. It can be understood that the substrate 11 can be a common BT board or PCB board in the art, but is not limited thereto.

[0048] Among them, the light-emitting unit includes a first light-emitting unit 2 and a second light-emitting unit 3. The first light-emitting unit 2 includes a first red light chip 21, a first green light chip 22, and a first blue light chip 23. The second light-emitting unit 3 includes a second red light chip 31, a second green light chip 32, and a second blue light chip 33. The first light-emitting unit 2 and the second light-emitting unit 3 are electrically connected. The first light-emitting unit 2 or the second light-emitting unit 3 contains an anti-electrode chip. The first light-emitting unit 2 is connected in a common cathode manner, and the second light-emitting unit 3 is connected in a common anode manner. Specifically, the first red light chip 21, the first green light chip 22, the first blue light chip 23, the second red light chip 31, the second green light chip 32, and the second blue light chip 33 all have a positive electrode and a negative electrode. The negative electrodes of the first red light chip 21, the first blue light chip 23, and the first green light chip 22 are connected to form the common cathode of the first light-emitting unit 2. The positive electrodes of the second red light chip 31, the second blue light chip 33, and the second green light chip 32 are connected to form the common anode of the second light-emitting unit 3.

[0049] In this application, through the design of the lamp bead structure, a counter electrode chip is added to the light-emitting unit. When the current distributed to a single lamp bead in the display module is not high, by using the reverse cut-off of the RGB chip, a two-in-one LED lamp bead with a common cathode and a common anode is obtained. Compared with the traditional two-in-one lamp bead structure with two common anodes, it can reduce the heat generated during the operation of the lamp bead, improve the display effect of the display screen, extend the lifespan of the lamp bead, reduce the parasitic leakage current, thereby reducing the power consumption. Moreover, it can control the two groups of light-emitting units to work independently. When a short circuit occurs in the two-in-one lamp bead, the first light-emitting unit 2 of the common anode and the second light-emitting unit 3 of the common cathode can be lit successively to accurately determine the faulty light-emitting chip, thus achieving precise repair.

[0050] Optionally, the counter electrode chip can ensure that the current can only flow from the anode to the cathode, avoiding instability or damage caused by reverse current flow. The counter electrode chip can be disposed in the first light-emitting unit 2 or in the second light-emitting unit 3. The counter electrode chip can be one of a red light chip, a green light chip, and a blue light chip. In this application, the common cathode node can be connected to the negative electrode of the driving circuit, the anodes of the first red light chip 21, the first green light chip 22, and the first blue light chip 23 are respectively connected to the positive electrode of the driving circuit, the common anode node is connected to the positive electrode of the driving circuit. Due to the existence of the counter electrode chip, its cathode is actually connected to the negative electrode of the driving circuit, and the cathodes of the remaining light-emitting chips are respectively connected to the negative electrode of the driving circuit, ensuring that the current directions of all light-emitting chips are unified, and a single driving circuit can be used to control all light-emitting chips.

[0051] Taking the second red light chip 31 as the counter electrode chip as an example for illustration.

[0052] Preferably, please refer to Figure 7 , the first light-emitting unit 2 is arranged in a straight line along the first direction, the second light-emitting unit 3 is arranged in a straight line along the first direction, the first light-emitting unit 2 and the second light-emitting unit 3 are arranged in parallel along the second direction and are asymmetrically arranged. By arranging the LED chips of different light-emitting colors, the circuit design can be simplified, facilitating the setting of the common anode and the common cathode, and ensuring that the light emitted by the LED lamp bead is more uniform in color and brightness, avoiding color deviation or uneven brightness, thereby further improving the display effect. It should be noted that the first direction can be the longitudinal direction of the substrate 11, the second direction is the transverse direction of the substrate 11, and the first direction and the second direction are perpendicular to each other.

[0053] Further, six metal functional areas 4 are provided on the front surface of the substrate 11, namely a first metal functional area 41, a second metal functional area 42, a third metal functional area 43, a fourth metal functional area 44, a fifth metal functional area 45, and a sixth metal functional area 46. The first red light chip 21 is fixed to the second metal functional area 42, the second blue light chip 33 is fixed to the third metal functional area 43, the first green light chip 22 and the second green light chip 32 are fixed to the fourth metal functional area 44, the first blue light chip 23 is fixed to the fifth metal functional area 45, and the second red light chip 31 is fixed to the sixth metal functional area 46. The first metal functional area 41 and the sixth metal functional area 46 are electrically connected to promote more uniform heat distribution, reduce the risk of local overheating, thereby reducing the total power consumption and prolonging the service life of the LED lamp bead. If the temperature is too high, it will lead to a decrease in the radiative recombination probability, and then lead to a decrease in the luminous efficiency. Moreover, an increase in temperature will cause the emission wavelength of the LED chip to shift, affecting the excitation efficiency of the phosphor, resulting in color rendering deviation, or a decrease in the white light color temperature. The electrical connection between the first metal functional area 41 and the sixth metal functional area 46 can be achieved through bonding wires or through an internal structure. The present invention does not make specific limitations on this.

[0054] Specifically, the light-emitting unit is electrically connected to the metal functional area 4. The negative electrodes of the first red light chip 21, the first green light chip 22, and the first blue light chip 23 share the second metal functional area 42 to form a common cathode. By controlling the positive voltage of the first red light chip 21, the first green light chip 22, and the first blue light chip 23 in the first light-emitting unit 2, the on and off states of the first red light chip 21, the first green light chip 22, and the first blue light chip 23 can be controlled respectively. The positive electrode of the second red light chip 31 is connected to the first metal functional area 41, and the positive electrodes of the second blue light chip 33 and the second green light chip 32 share the sixth metal functional area 46 to form a common anode. By controlling the positive voltage of the second red light chip 31 and the negative voltages of the second green light chip 32 and the second blue light chip 33 in the second light-emitting unit 3, the on and off states of the second red light chip 31, the second green light chip 32, and the second blue light chip 33 can be controlled respectively. In some specific and preferred embodiments, the light-emitting unit and the metal functional area 4 are electrically connected by bonding wires, and the bonding wires can be made of gold (Au), aluminum (Al), or copper (Cu), having good electrical conductivity and mechanical strength.

[0055] Optionally, the second metal functional area 42 is L-shaped, which can more effectively utilize the space inside the lamp bead, shorten the connection path between the negative electrode of the first green light chip 22 and the first blue light chip 23 to promote the formation of a common cathode, and can also increase the heat dissipation area and improve the heat dissipation effect of the LED lamp bead.

[0056] Further, the positive electrode of the first red light chip 21 is connected to the negative electrode of the second blue light chip 33; the positive electrode of the first green light chip 22 is connected to the negative electrode of the second green light chip 32; the positive electrode of the first blue light chip 23 is connected to the positive electrode of the second red light chip 31. Please refer to Figure 10 . By connecting the light-emitting chips in the first light-emitting unit 2 and the light-emitting chips in the second light-emitting unit 3, not only can the design of common cathode and common anode be realized, reducing the number of pins, improving the current distribution, and enhancing the stability and reliability of the circuit, but also the brightness and color of the LED chips in the two groups of light-emitting units can be independently controlled to achieve rich color mixing and adjustment effects, improving the light-emitting quality and visual effect, and meeting the lighting requirements of different application scenarios.

[0057] Preferably, please refer to Figure 7 , after passing through the side wall of the substrate 11, the metal functional area 4 is connected to the pin area 5, and the pins in the pin area 5 penetrate the bottom of the bracket 1. In this application, the pins in the pin area 5 are through pins, which increase the welding area and improve the flatness of the pins. On the one hand, it can improve the low-placement consistency of the two-in-one LED lamp beads, and on the other hand, it can increase the heat dissipation area of the two-in-one LED lamp beads, thereby further improving the service life of the two-in-one LED lamp beads. In some specific and preferred embodiments, the pins in the pin area 5 penetrate one side wall of the substrate 11 and wrap the bottom of the bracket 1 to further increase the contact area and enhance the anti-collision performance of the LED lamp beads.

[0058] Specifically, please refer to Figure 8 , the pin area 5 includes a first pin 51, a second pin 52, a third pin 53, a fourth pin 54, a fifth pin 55, and a sixth pin 56. The first pin 51 is connected to the first metal functional area 41, the second pin 52 is connected to the second metal functional area 42, the third pin 53 is connected to the third metal functional area 43, the fourth pin 54 is connected to the fourth metal functional area 44, the fifth pin 55 is connected to the fifth metal functional area 45, and the sixth pin 56 is connected to the sixth metal functional area 46. The pins serve as the injection points of current, transmitting the current into the LED chips to make them emit light, and by controlling the voltage of each pin, the brightness and color of each LED chip can be independently controlled.

[0059] It can be understood that an identification structure for positioning and identifying the polarity of the LED lamp beads can also be provided on the front and / or back of the substrate 11. The identification structure can be an irregular shape. In this application, the shape and specific position of the identification structure are not specifically limited, as long as the requirement of polarity identification can be met.

[0060] Preferably, the encapsulation glue layer 6 can be used to protect the light-emitting chip, preventing the light-emitting chip from being affected by moisture, dust, chemical substances, etc. in the external environment. At the same time, the electrodes and leads in the light-emitting chip are sealed and covered to ensure the reliability of the electrical connection, thereby extending the service life of the LED lamp bead. Specifically, the encapsulation glue layer 6 is cured from the commonly used encapsulation glue in the art. There are multiple choices for the encapsulation glue, including but not limited to epoxy resin, silicone resin, and silica gel. Moreover, components such as diffusion powder of silicon dioxide or silica or phosphor powder can be added to the encapsulation glue. The components of the phosphor powder can be nitride, silicate, potassium chromium, lutetium chromium, etc. The present application does not make specific limitations on the material of the encapsulation glue layer 6.

[0061] Correspondingly, the present invention also provides a preparation method for a two-in-one LED lamp bead structure, including:

[0062] (1) Provide a metal plate and process it to form a bracket 1 with a substrate 11;

[0063] Among them, the metal base material can be copper foil, but is not limited thereto.

[0064] Specifically, after the common stamping process and stretching process in the art, the unnecessary parts on the metal base material can be removed, and then the metal substrate 11 is formed. Further, the bracket 1 glue commonly used in the art is used for injection molding to obtain a reflector cup bracket 1 arranged around the light-emitting unit. The bracket 1 glue can be PPA, PA6T, PA9T, PCT, EMC, or epoxy resin, but is not limited thereto. More preferably, the bracket 1 glue is selected as PPA, which has high strength, good rigidity, and excellent fatigue resistance.

[0065] (2) Form a metal functional area 4 on the front surface of the substrate 11;

[0066] Optionally, by setting a metal layer on the front surface of the substrate 11, a partitioned metal functional area 4 is formed to conduct the heat generated by the LED chip to the outside, prevent local overheating, effectively extend the service life of the LED, and improve its reliability.

[0067] (3) Fix the light-emitting unit on the front surface of the substrate 11 so that the light-emitting unit is connected to the metal functional area 4;

[0068] (4) Bend the back surface of the substrate 11 to form a pin area 5 and electrically connect the pin area 5 and the metal functional area 4;

[0069] (5) Wrap and form an encapsulation glue layer 6 on the surfaces of the substrate 11 and the light-emitting unit.

[0070] Correspondingly, the present invention also provides a display screen, including the above-mentioned two-in-one LED lamp bead structure. The obtained display screen has good display effects, is easy to repair when a failure occurs, and has a long service life.

[0071] The present invention will be further described below with specific embodiments:

[0072] Embodiment 1

[0073] This embodiment provides a two-in-one LED lamp bead structure, including:

[0074] A bracket, the bracket includes a horizontally arranged substrate;

[0075] A light-emitting unit disposed on the front surface of the substrate, the light-emitting unit includes a first light-emitting unit and a second light-emitting unit. The first light-emitting unit is arranged in a straight line along a first direction, the second light-emitting unit is arranged in a straight line along the first direction, the first light-emitting unit and the second light-emitting unit are arranged in parallel along a second direction, and are asymmetrically arranged; wherein, the first light-emitting unit includes a first red light chip, a first green light chip and a first blue light chip, and the second light-emitting unit includes a second red light chip, a second green light chip and a second blue light chip. Among them, the second red light chip is an anti-electrode chip, the first light-emitting unit is connected in common cathode, and the second light-emitting unit is connected in common anode;

[0076] Six metal functional areas are provided on the front surface of the substrate, namely a first metal functional area, a second metal functional area, a third metal functional area, a fourth metal functional area, a fifth metal functional area and a sixth metal functional area. The first red light chip is fixed to the second metal functional area, the second blue light chip is fixed to the third metal functional area, the first green light chip and the second green light chip are fixed to the fourth metal functional area, the first blue light chip is fixed to the fifth metal functional area, the second red light chip is fixed to the sixth metal functional area, the first metal functional area and the sixth metal functional area are electrically connected. The negative electrodes of the first red light chip, the first green light chip and the first blue light chip share the second metal functional area to form a common cathode; the positive electrode of the second red light chip is connected to the first metal functional area, and the positive electrodes of the second blue light chip and the second green light chip share the sixth metal functional area to form a common anode; the first light-emitting unit is connected in common cathode, the second light-emitting unit is connected in common anode, and the positive electrode of the first red light chip is connected to the negative electrode of the second blue light chip; the positive electrode of the first green light chip is connected to the negative electrode of the second green light chip; the positive electrode of the first blue light chip is connected to the positive electrode of the second red light chip;

[0077] A pin area disposed on the back surface of the substrate, the metal functional area passes through the side wall of the substrate and is connected to the pin area, the pins in the pin area penetrate the bottom of the bracket, the pin area includes a first pin, a second pin, a third pin, a fourth pin, a fifth pin and a sixth pin, the first pin is connected to the first metal functional area, the second pin is connected to the second metal functional area, the third pin is connected to the third metal functional area, the fourth pin is connected to the fourth metal functional area, the fifth pin is connected to the fifth metal functional area, and the sixth pin is connected to the sixth metal functional area;

[0078] An encapsulation glue layer wrapping the substrate and the light-emitting unit.

[0079] Correspondingly, this embodiment also provides a preparation method for a two-in-one LED lamp bead structure, including:

[0080] (1) Provide a metal plate and process it to form a bracket with a substrate;

[0081] (2) Form a metal functional area on the front surface of the substrate;

[0082] (3) Fix a light-emitting unit on the front surface of the substrate so that the light-emitting unit is connected to the metal functional area;

[0083] (4) Bend to form a pin area on the back surface of the substrate and electrically connect the pin area and the metal functional area;

[0084] (5) Wrap and form an encapsulation glue layer on the surfaces of the substrate and the light-emitting unit.

[0085] Correspondingly, this embodiment also provides a display screen, including the above two-in-one LED lamp bead structure.

[0086] Embodiment 2

[0087] This embodiment provides a two-in-one LED lamp bead structure, which is basically the same as Embodiment 1, except that:

[0088] The second metal functional area is L-shaped.

[0089] Embodiment 3

[0090] This embodiment provides a two-in-one LED lamp bead structure, which is basically the same as Embodiment 1, except that:

[0091] On the front side of the substrate, there are five metal functional areas, namely the first metal functional area, the second metal functional area, the third metal functional area, the fourth metal functional area, and the fifth metal functional area. The first red light chip is fixed on the first metal functional area, the second blue light chip is fixed on the second metal functional area, the first green light chip and the second green light chip are fixed on the third metal functional area, the first blue light chip is fixed on the fourth metal functional area, and the second red light chip is fixed on the fifth metal functional area.

[0092] Example 4

[0093] This embodiment provides a two-in-one LED lamp bead structure, which is basically the same as that in Example 1, except that:

[0094] The first light-emitting unit is arranged in a straight line along the first direction, the second light-emitting unit is arranged in a straight line along the first direction, the first light-emitting unit and the second light-emitting unit are arranged side by side along the second direction, and are symmetrically arranged.

[0095] Comparative Example 1

[0096] This comparative example provides a two-in-one LED lamp bead structure, the structure of which is as Figures 4-6 shown, and is basically the same as that in Example 1, except that: the first light-emitting unit and the second light-emitting unit do not contain anti-electrode chips, and both groups of RGB are common positive. Specifically:

[0097] There are 8 metal functional areas on the front side of the substrate. The positive electrodes of the first red light chip, the first blue light chip, and the first green light chip are connected to form the common anode of the first light-emitting unit. The positive electrodes of the second red light chip, the second blue light chip, and the second green light chip are connected to form the common anode of the second light-emitting unit. The negative electrodes of the first red light chip, the first green light chip, the first blue light chip, the negative electrode of the second red light chip, the negative electrode of the second green light chip, and the negative electrode of the second blue light chip are respectively connected to a metal functional area;

[0098] Correspondingly, the pin area on the back side of the substrate includes 5 pins, namely two common anodes, the positive electrode of the red light chip, the positive electrode of the green light chip, and the positive electrode of the blue light chip. And the pins pass through the front side of the bracket and then bend inward to the bottom of the bracket to form an outer package pin structure.

[0099] Comparative Example 2

[0100] This comparative example provides a two-in-one LED lamp bead structure, which is basically the same as that in Example 1, except that: the first light-emitting unit is connected with a common anode, and the second light-emitting unit is connected with a common anode;

[0101] The second red light chip is a conventional electrode chip.

[0102] Performance test

[0103] For each LED lamp bead obtained in the examples and comparative examples, a display screen with a P0.7mm pitch of the same size was attached, the same refresh frequency and test current were set, the power and display effect (resolution) of the display screens of the examples and comparative examples were tested, and the calculation was made based on Comparative Example 1.

[0104] The test results are shown in Table 1.

[0105] Table 1 Performance test results of LED display screens obtained in the examples and comparative examples

[0106] Power consumption Resolution Example 1 95％ 105％ Example 2 90％ 110％ Example 3 98％ 103％ Example 4 98％ 103％ Comparative Example 1 100％ 100％ Comparative Example 2 100％ 100％

[0107] As can be seen from the above results, an anti-electrode chip can be added to the light-emitting unit in the application. When the current distributed to a single lamp bead in the display screen module is not high, the RGB chip is used for reverse cut-off, and the structure of the two-in-one LED lamp bead is optimized to include a common cathode and a common anode, which can reduce the heat generated during the operation of the lamp bead, improve the display effect of the display screen, and significantly improve its maximum brightness, luminous efficiency and color temperature. And setting the second metal functional area as an L shape can further reduce the power consumption during the operation of the lamp bead and further improve the display effect.

[0108] The above-disclosed is only a preferred embodiment of the present invention. Of course, it cannot be used to limit the scope of the rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A two-in-one LED lamp bead structure, characterized in that, Comprising: A bracket, the bracket including a horizontally arranged substrate; A light-emitting unit mounted on the front surface of the substrate, the light-emitting unit including a first light-emitting unit and a second light-emitting unit, the first light-emitting unit including a first red light chip, a first green light chip, and a first blue light chip, the second light-emitting unit including a second red light chip, a second green light chip, and a second blue light chip, the first light-emitting unit and the second light-emitting unit being electrically connected, the first light-emitting unit or the second light-emitting unit including an opposite electrode chip, the first light-emitting unit being connected in common cathode, and the second light-emitting unit being connected in common anode; A metal functional area provided on the front surface of the substrate, the light-emitting unit being electrically connected to the metal functional area; A pin area provided on the back surface of the substrate, the pin area being electrically connected to the metal functional area; An encapsulation glue layer wrapping the substrate and the light-emitting unit.

2. The two-in-one LED lamp bead structure according to claim 1, wherein The second red light chip is an opposite electrode chip.

3. The two-in-one LED lamp bead structure according to claim 2, wherein, Six metal functional areas are provided on the front surface of the substrate, namely a first metal functional area, a second metal functional area, a third metal functional area, a fourth metal functional area, a fifth metal functional area, and a sixth metal functional area; The first red light chip is fixed to the second metal functional area, the second blue light chip is fixed to the third metal functional area, the first green light chip and the second green light chip are fixed to the fourth metal functional area, the first blue light chip is fixed to the fifth metal functional area, the second red light chip is fixed to the sixth metal functional area, and the first metal functional area and the sixth metal functional area are electrically connected.

4. The two-in-one LED lamp bead structure according to claim 3, wherein, The negative electrodes of the first red light chip, the first green light chip, and the first blue light chip share the second metal functional area to form a common cathode; The positive electrode of the second red light chip is connected to the first metal functional area, and the positive electrodes of the second blue light chip and the second green light chip share the sixth metal functional area to form a common anode.

5. The two-in-one LED lamp bead structure according to claim 4, wherein The positive electrode of the first red light chip is connected to the negative electrode of the second blue light chip; the positive electrode of the first green light chip is connected to the negative electrode of the second green light chip; the positive electrode of the first blue light chip is connected to the positive electrode of the second red light chip.

6. The two-in-one LED lamp bead structure according to claim 4 or 5, characterized in that The second metal functional area is L-shaped; The light-emitting unit and the metal functional area are electrically connected by bonding wires.

7. The two-in-one LED lamp bead structure according to claim 1, wherein, The metal functional area passes through the side wall of the substrate and is connected to the pin area, and the pins in the pin area penetrate the bottom of the bracket; The pin area includes a first pin, a second pin, a third pin, a fourth pin, a fifth pin, and a sixth pin. The first pin is connected to the first metal functional area, the second pin is connected to the second metal functional area, the third pin is connected to the third metal functional area, the fourth pin is connected to the fourth metal functional area, the fifth pin is connected to the fifth metal functional area, and the sixth pin is connected to the sixth metal functional area.

8. The two-in-one LED lamp bead structure according to any one of claims 1-5, characterized in that, The first light-emitting unit is arranged in a straight line along a first direction, the second light-emitting unit is arranged in a straight line along the first direction, and the first light-emitting unit and the second light-emitting unit are arranged in parallel along a second direction and are asymmetrically arranged.

9. A preparation method of the two-in-one LED lamp bead structure according to claim 1, characterized in that, Comprising: Provide a metal plate and process it to form a bracket with a substrate; Form a metal functional area on the front surface of the substrate; Fix a light-emitting unit on the front surface of the substrate so that the light-emitting unit is connected to the metal functional area; Bend to form a pin area on the back surface of the substrate and electrically connect the pin area and the metal functional area; Wrap the surfaces of the substrate and the light-emitting unit to form a packaging glue layer.

10. A display screen, characterized in that, Include the two-in-one LED lamp bead structure according to any one of claims 1-8.

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