LED display device and display panel

Abstract

The utility model discloses an LED display device and a display panel, the LED display device comprises a plurality of pixel units, each pixel unit comprises a plurality of LED light-emitting chips which are arranged in a line shape, and the LED light-emitting chips with the same light-emitting color in the plurality of pixel units are in central symmetry with respect to the central point of the LED display device. The LED light-emitting chips with the same light-emitting color in the plurality of pixel units are in central symmetry about the central point of the LED display device, namely, the emergent light of the LED display device is in central symmetry about the central point of the LED display device, so that the display effect of the LED display device is consistent no matter which direction is viewed, and the display effect is improved.

Description

Technical Field

[0001] The utility model relates to LED display technology, in particular to an LED display device and a display panel. Background Art

[0002] An LED display panel is composed of a plurality of independent LED display devices arranged in an array. Existing LED display devices usually include a plurality of light-emitting chips. When forming a display panel, the pins of multiple independent LED light-emitting devices need to be welded to a circuit board.

[0003] The multiple light-emitting chips in an LED display device are usually arranged in a "one" shape, and all LED devices in the display panel are repetitively arrayed with the same orientation or angle. Figure 1 As a structural schematic diagram of an LED display device, as Figure 1 shown, the LED display device includes three light-emitting chips, namely a red light chip R, a green light chip G, and a blue light chip B, and the three light-emitting chips are arranged in a "one" shape.

[0004] After forming the display panel, when viewed from a direction perpendicular to the arrangement direction of the light-emitting chips (the horizontal arrow shown in the figure), since the distances from the multiple light-emitting chips to the human eye are not much different, and since the light emission on both sides of the light-emitting chips in the direction perpendicular to the arrangement direction of the light-emitting chips is symmetric, therefore, there is no color cast when viewed from both sides in the direction perpendicular to the arrangement direction of the light-emitting chips. However, when viewed from the arrangement direction of the light-emitting chips (the vertical arrow shown in the figure), since the distances from the multiple light-emitting chips to the human eye are quite different, and since the light emission on both sides of the light-emitting chips in the arrangement direction of the light-emitting chips is asymmetric, therefore, there is an obvious color cast when viewed from both sides in the arrangement direction of the light-emitting chips, affecting the display effect. Summary of the Utility Model

[0005] The utility model provides an LED display device and a display panel, which can achieve that the display effect of the LED display device is the same no matter from which direction it is viewed, improving the display effect.

[0006] In a first aspect, the utility model provides an LED display device, including a plurality of pixel units, wherein the pixel units include a plurality of LED light-emitting chips arranged in a "one" shape, and the LED light-emitting chips with the same light-emitting color in the plurality of pixel units are centrosymmetric about the center point of the LED display device.

[0007] Optionally, the LED display device includes four pixel units arranged in a matrix. The pixel unit in the first row and first column is designated as the first pixel unit, and the others are sequentially designated as the second, third, and fourth pixel units in a clockwise direction. The arrangement direction of the LED light-emitting chips in the second pixel unit is rotated 90° clockwise relative to the arrangement direction of the LED light-emitting chips in the first pixel unit. The arrangement direction of the LED light-emitting chips in the third pixel unit is rotated 90° clockwise relative to the arrangement direction of the LED light-emitting chips in the second pixel unit. The arrangement direction of the LED light-emitting chips in the fourth pixel unit is rotated 90° clockwise relative to the arrangement direction of the LED light-emitting chips in the third pixel unit.

[0008] Optionally, in the same row of pixel units, the A-pole of all LED light-emitting chips in two pixel units is electrically connected, and in the same column of pixel units, the B-pole of LED light-emitting chips of the same color is electrically connected.

[0009] Optionally, the pixel unit includes a red LED light-emitting chip, a green LED light-emitting chip, and a blue LED light-emitting chip.

[0010] Optionally, the LED display device includes a substrate, a pad layer, and a lead layer, wherein the pad layer and the lead layer are respectively disposed on opposite sides of the substrate;

[0011] The pixel unit includes a eutectic pad, a first pad, a second pad, and a third pad, wherein the eutectic pad, the first pad, the second pad, and the third pad belong to the pad layer;

[0012] The pin layer includes a first common A-pole pin, a second common A-pole pin, a first red light pin, a second red light pin, a first green light pin, a second green light pin, a first blue light pin, and a second blue light pin;

[0013] In the pixel unit, the red LED light-emitting chip, the green LED light-emitting chip, and the blue LED light-emitting chip are all fixed on the eutectic pad, and the A-pole of the red LED light-emitting chip, the green LED light-emitting chip, and the blue LED light-emitting chip are electrically connected to the eutectic pad, the B-pole of the red LED light-emitting chip is electrically connected to the first pad, the B-pole of the green LED light-emitting chip is electrically connected to the second pad, and the B-pole of the blue LED light-emitting chip is electrically connected to the third pad.

[0014] In the first row of pixel units, the two eutectic pads are electrically connected and electrically connected to the first common A-pole pin; in the second row of pixel units, the two eutectic pads are electrically connected and electrically connected to the second common A-pole pin.

[0015] In the first column of pixel units, two first pads are electrically connected and electrically connected to the first red light pin, two second pads are electrically connected and electrically connected to the first green light pin, and two third pads are electrically connected and electrically connected to the first blue light pin; in the second column of pixel units, two first pads are electrically connected and electrically connected to the second red light pin, two second pads are electrically connected and electrically connected to the second green light pin, and two third pads are electrically connected and electrically connected to the second blue light pin.

[0016] Optionally, in the first row of pixel units, the two eutectic pads are electrically connected through a first metal trace located in the pad layer, and the eutectic pad of the second pixel unit is electrically connected to the first common A-pin through a first metal hole penetrating the substrate; in the second row of pixel units, the two eutectic pads are electrically connected through a second metal trace located in the pad layer, and the eutectic pad of the fourth pixel unit is electrically connected to the second common A-pin through a second metal hole penetrating the substrate.

[0017] In the first column of pixel units, the first pad of the first pixel unit is electrically connected to the third metal trace and the first red light pin located on the pin layer through a third metal hole penetrating the substrate; the first pad of the fourth pixel unit is electrically connected to the third metal trace through a fourth metal hole penetrating the substrate; the second pads of the first pixel unit and the fourth pixel unit are electrically connected to each other through a fourth metal trace located on the pad layer; the second pad of the first pixel unit is electrically connected to the first green light pin through a fifth metal hole penetrating the substrate; the third pads of the first pixel unit and the fourth pixel unit are electrically connected to each other through a fifth metal trace located on the pad layer; the fifth metal trace is electrically connected to the first blue light pin through a sixth metal hole penetrating the substrate.

[0018] In the second column of pixel units, the first pad of the second pixel unit and the first pad of the third pixel unit are electrically connected through a sixth metal trace located on the pad layer. The sixth metal trace is electrically connected to the second red light pin through a seventh metal hole penetrating the substrate. The second pad of the second pixel unit and the second pad of the third pixel unit are electrically connected through a seventh metal trace located on the pad layer. The seventh metal trace is electrically connected to an eighth metal trace located on the pin layer through an eighth metal hole penetrating the substrate. The eighth metal trace is electrically connected to the second green light pin. The third pad of the second pixel unit and the third pad of the third pixel unit are electrically connected through a ninth metal trace located on the pad layer. The ninth metal trace is electrically connected to the second blue light pin through a ninth metal hole penetrating the substrate.

[0019] Optionally, the first common A-pin and the second common A-pin are respectively located diagonally opposite each other in the LED display device.

[0020] Optionally, a light-blocking layer is provided on the side of the pad layer away from the substrate. The light-blocking layer has an opening in the area where the pixel unit is located, exposing the LED light-emitting chip of the pixel unit. The opening is filled with light-transmitting encapsulating adhesive.

[0021] Optionally, an insulating layer is provided on the side of the substrate away from the pad layer, the insulating layer covers the metal traces of the pin layer, and an opening is provided at the pin of the pin layer to expose the pin.

[0022] In a second aspect, the present invention provides a display panel, including a circuit board and a plurality of LED display devices as described in the first aspect of the present invention, wherein the plurality of LED display devices are arranged in an array on the circuit board.

[0023] The LED display device provided by this utility model includes multiple pixel units, each pixel unit comprising multiple LED light-emitting chips arranged in a "I" shape. LED light-emitting chips of the same color within the multiple pixel units are centrally symmetrical about the center point of the LED display device. This central symmetry ensures that the light emitted by the LED display device is symmetrical about its center point, resulting in a consistent display effect regardless of the viewing direction, thus improving the overall display quality. Attached Figure Description

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0025] Figure 1 This is a schematic diagram of the structure of an LED display device;

[0026] Figure 2 A top view of an LED display device provided by this utility model;

[0027] Figure 3 An internal circuit diagram of an LED display device provided by this utility model;

[0028] Figure 4 A cross-sectional view of an LED display device provided by this utility model;

[0029] Figure 5 A schematic diagram of the structure of a pad layer provided by this utility model;

[0030] Figure 6 A schematic diagram of the pin layer structure provided by this utility model;

[0031] Figure 7 This is a bottom view of an LED display device provided by the present invention. Detailed Implementation

[0032] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0033] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. Additionally, the terms "first" and "second" are used merely for descriptive distinction and have no specific meaning.

[0035] This invention provides an LED display device comprising multiple pixel units. Each pixel unit includes multiple LED light-emitting chips arranged in a straight line. LED light-emitting chips of the same color within the multiple pixel units are centrally symmetrical about the center point of the LED display device. For example, the LED display device may include three or more pixel units, each pixel unit including three light-emitting chips: a red chip R, a green chip G, and a blue chip B. These three chips are arranged in a straight line. The fact that LED light-emitting chips of the same color within the multiple pixel units are centrally symmetrical about the center point of the LED display device means that the light emitted by the LED display device is centrally symmetrical about its center point. This ensures that the display effect is consistent regardless of the viewing direction, thus improving the display quality.

[0036] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be described below through specific embodiments. It should be noted that the embodiments of this utility model should be understood as exemplary descriptions of this utility model rather than limitations.

[0037] Figure 2 A top view of an LED display device provided by this utility model, as shown below. Figure 2 As shown, the LED display device includes four pixel units arranged in a matrix. The pixel unit in the first row and first column is designated as the first pixel unit P1, and the others are designated as the second pixel unit P2, the third pixel unit P3, and the fourth pixel unit P4 in a clockwise direction. The arrangement direction of the LED light-emitting chips in the second pixel unit P2 is rotated 90° clockwise relative to the arrangement direction of the LED light-emitting chips in the first pixel unit P1. The arrangement direction of the LED light-emitting chips in the third pixel unit P3 is rotated 90° clockwise relative to the arrangement direction of the LED light-emitting chips in the second pixel unit P2. The arrangement direction of the LED light-emitting chips in the fourth pixel unit P4 is rotated 90° clockwise relative to the arrangement direction of the LED light-emitting chips in the third pixel unit P3.

[0038] For example, in some embodiments of the present invention, each pixel unit includes a red LED light-emitting chip R, a green LED light-emitting chip G, and a blue LED light-emitting chip B.

[0039] For example, in some embodiments of this utility model, in the same row of pixel units, the A-pole of all LED light-emitting chips in two pixel units is electrically connected, and in the same column of pixel units, the B-pole of LED light-emitting chips of the same light-emitting color in two pixel units is electrically connected. Figure 3 An internal circuit diagram of an LED display device provided by this utility model is shown below. Figure 3As shown, in the first row of pixel units, the A-polarities of all LED chips in two pixel units (P1 and P2) are electrically connected. In the second row of pixel units, the A-polarities of all LED chips in two pixel units (P3 and P4) are electrically connected. In the first column of pixel units, the B-polarities of LED chips of the same color in two pixel units (P1 and P4) are electrically connected, i.e., the B-polarities of two red LED chips R, two green LED chips G, and two blue LED chips B are electrically connected. In the second column of pixel units, the B-polarities of LED chips of the same color in two pixel units (P2 and P3) are electrically connected, i.e., the B-polarities of two red LED chips R, two green LED chips G, and two blue LED chips B are electrically connected. In this embodiment of the invention, A-polarity is the cathode of the LED chip, and B-polarity is the anode of the LED chip. In other embodiments of the invention, A-polarity is the anode of the LED chip, and B-polarity is the cathode of the LED chip; this invention is not limited thereto.

[0040] Figure 4 This is a cross-sectional view of an LED display device provided by this utility model, with the cross-sectional lines being... Figure 2 C-C' in Figure 5 This is a schematic diagram of the structure of a pad layer provided by this utility model. Figure 6 This is a schematic diagram of a pin layer structure provided by the present invention. Figure 7 A bottom view of an LED display device provided by this utility model, as shown below. Figure 2-7 As shown, the LED display device includes a substrate 110, a pad layer 120, and a lead layer 130, with the pad layer 120 and the lead layer 130 respectively disposed on opposite sides of the substrate 110.

[0041] Each pixel unit includes a eutectic pad 124, a first pad 121, a second pad 122, and a third pad 123, all of which belong to the pad layer 120.

[0042] The pin layer 130 includes a first common A-pole pin C12, a second common A-pole pin C34, a first red light pin R14, a second red light pin R23, a first green light pin G14, a second green light pin G23, a first blue light pin B14, and a second blue light pin B23.

[0043] In each pixel unit, a red LED chip R, a green LED chip G, and a blue LED chip B are all fixed on a eutectic pad 124. The A-terminals of the red LED chip R, green LED chip G, and blue LED chip B are electrically connected to the eutectic pad 124. The B-terminal of the red LED chip R is electrically connected to the first pad 121, the B-terminal of the green LED chip G is electrically connected to the second pad 122, and the B-terminal of the blue LED chip B is electrically connected to the third pad 123. For example, in this embodiment of the invention, the red LED chip R is a vertical LED chip, with its two electrodes located on the light-emitting side and the side opposite to the light-emitting side, respectively. The green LED chip G and the blue LED chip B are both upright LED chips, with both electrodes located on the light-emitting side of the chip. For example, the A-pole of the red LED chip R is fixed to the eutectic pad 124 by conductive adhesive or soldering, the backlight sides of the green LED chip G and the blue LED chip B are fixed to the eutectic pad 124 by insulating adhesive, the B-pole of the red LED chip R is electrically connected to the first pad 121 by a metal wire, the B-pole of the green LED chip G is electrically connected to the second pad 122 by a metal wire, and the B-pole of the blue LED chip B is electrically connected to the third pad 123 by a metal wire.

[0044] In the first row of pixel units (P1 and P2), the two eutectic pads 124 are electrically connected and are also electrically connected to the first common A-terminal pin C12. In the second row of pixel units (P3 and P4), the two eutectic pads 124 are electrically connected and are also electrically connected to the second common A-terminal pin C34.

[0045] In the first column of pixel units (P1 and P4), two first pads 121 are electrically connected and electrically connected to the first red light pin R14, two second pads 122 are electrically connected and electrically connected to the first green light pin G14, and two third pads 123 are electrically connected and electrically connected to the first blue light pin B14; in the second column of pixel units (P2 and P3), two first pads 121 are electrically connected and electrically connected to the second red light pin R23, two second pads 122 are electrically connected and electrically connected to the second green light pin G23, and two third pads 123 are electrically connected and electrically connected to the second blue light pin B23.

[0046] For example, in the first row of pixel units (P1 and P2), the two eutectic pads 124 are electrically connected through the first metal trace L1 located in the pad layer 120, and the eutectic pad 124 of the second pixel unit P2 is electrically connected to the first common A electrode pin C12 through the first metal hole H1 penetrating the substrate 110; in the second row of pixel units (P3 and P4), the two eutectic pads 124 are electrically connected through the second metal trace L2 located in the pad layer 120, and the eutectic pad 124 of the fourth pixel unit P4 is electrically connected to the second common A electrode pin C34 through the second metal hole H2 penetrating the substrate 110.

[0047] In the first column of pixel units (P1 and P4), the first pad 121 of the first pixel unit P1 is electrically connected to the third metal trace L3 and the first red light pin R14 located on the pin layer 130 through the third metal hole H3 penetrating the substrate 110; the first pad 121 of the fourth pixel unit P4 is electrically connected to the third metal trace L3 through the fourth metal hole H4 penetrating the substrate 110; the second pad 122 of the first pixel unit P1 and the second pad 122 of the fourth pixel unit P4 are electrically connected through the fourth metal trace L4 located on the pad layer 120; the second pad 122 of the first pixel unit P1 is electrically connected to the first green light pin G14 through the fifth metal hole H5 penetrating the substrate 110; the third pad 123 of the first pixel unit P1 and the third pad 123 of the fourth pixel unit P4 are electrically connected through the fifth metal trace L5 located on the pad layer 120; the fifth metal trace L5 is electrically connected to the first blue light pin B14 through the sixth metal hole H6 penetrating the substrate 110.

[0048] In the second row of pixel units (P2 and P3), the first pad 121 of the second pixel unit P2 and the first pad 121 of the third pixel unit P3 are electrically connected through a sixth metal trace L6 located on the pad layer 120. The sixth metal trace L6 is electrically connected to the second red light pin R23 through a seventh metal hole H7 penetrating the substrate 110. The second pad 122 of the second pixel unit P2 and the second pad 122 of the third pixel unit P3 are electrically connected through a seventh metal trace L7 located on the pad layer 120. Next, the seventh metal trace L7 is electrically connected to the eighth metal trace L8 located on the pin layer 130 through the eighth metal hole H8 penetrating the substrate 110, and the eighth metal trace L8 is electrically connected to the second green light pin G23; the third pad 123 of the second pixel unit P2 and the third pad 123 of the third pixel unit P3 are electrically connected through the ninth metal trace L9 located on the pad layer 120, and the ninth metal trace L9 is electrically connected to the second blue light pin B23 through the ninth metal hole H9 penetrating the substrate 110.

[0049] In some embodiments of this utility model, such as Figure 6 , 7As shown, the first common A-pin C12 and the second common A-pin C34 are respectively located diagonally opposite each other in the LED display device. For example, the first common A-pin C12 is located at the corner corresponding to the second pixel unit P2, and the second common A-pin C34 is located at the corner corresponding to the fourth pixel unit P4. By placing the first common A-pin C12 and the second common A-pin C34 diagonally opposite each other in the LED display device, when designing the circuit board for carrying and driving the LED display device, the lines connecting the first common A-pin C12 and the second common A-pin C34 can be designed to pass through the gap between two adjacent LED display devices. This avoids the potential short circuit problem caused by designing all lines to pass through the projection area of ​​the LED display device on the circuit board, reducing the design cost of the circuit board and improving the working stability of the LED display device.

[0050] In some embodiments of this utility model, such as Figure 4 As shown, a light-blocking layer 140 is provided on the side of the pad layer 120 away from the substrate 110. The light-blocking layer 140 has an opening in the area where the pixel unit is located, exposing the LED light-emitting chip of the pixel unit. In this way, two adjacent pixel units are isolated, preventing light leakage between adjacent pixel units and enhancing the display effect. The opening is filled with a light-transmitting encapsulating adhesive 150 to protect and fix the LED light-emitting chip in the pixel unit. The surface of the encapsulating adhesive 150 can be flush with the light-blocking layer 140 or designed as a convex mirror; this invention does not limit the specific design.

[0051] In some embodiments of this utility model, such as Figure 4 , 7 As shown, an insulating layer 160 is provided on the side of the substrate 110 away from the pad layer 120. The insulating layer 160 covers the metal traces of the pin layer 130, and an opening is provided at the pin of the pin layer 130 to expose the pin so that the pin can be electrically connected to the circuit on the circuit board when the LED display device is fixed to the circuit board.

[0052] This utility model also provides a display panel, including a circuit board and a plurality of LED display devices as provided in any of the foregoing embodiments of this utility model. The plurality of LED display devices are arranged in an array on the circuit board. The display panel can achieve the functions and effects achieved by the LED display devices provided in any of the foregoing embodiments of this utility model.

[0053] In the description herein, it should be understood that the terms "upper," "lower," "left," "right," etc., are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0054] In the description of this specification, references to terms such as "an embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0055] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0056] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without any inventive effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. An LED display device, characterized in that, It includes multiple pixel units, each pixel unit comprising multiple LED light-emitting chips arranged in a "I" shape, wherein LED light-emitting chips of the same color in the multiple pixel units are symmetrical about the center point of the LED display device; The LED display device includes a first common A-pole pin and a second common A-pole pin; The first common A-pin and the second common A-pin are respectively located diagonally opposite each other in the LED display device.

2. The LED display device according to claim 1, characterized in that, The LED display device includes four pixel units arranged in a matrix. The pixel unit in the first row and first column is designated as the first pixel unit, and the others are designated as the second, third, and fourth pixel units in a clockwise direction. The arrangement direction of the LED light-emitting chips in the second pixel unit is rotated 90° clockwise relative to the arrangement direction of the LED light-emitting chips in the first pixel unit. The arrangement direction of the LED light-emitting chips in the third pixel unit is rotated 90° clockwise relative to the arrangement direction of the LED light-emitting chips in the second pixel unit. The arrangement direction of the LED light-emitting chips in the fourth pixel unit is rotated 90° clockwise relative to the arrangement direction of the LED light-emitting chips in the third pixel unit.

3. The LED display device according to claim 2, characterized in that, In the same row of pixel units, the A-pole of all LED chips in two pixel units is electrically connected, and in the same column of pixel units, the B-pole of LED chips of the same color is electrically connected.

4. The LED display device according to claim 3, characterized in that, The pixel unit includes a red LED light-emitting chip, a green LED light-emitting chip, and a blue LED light-emitting chip.

5. The LED display device according to claim 4, characterized in that, The LED display device includes a substrate, a pad layer, and a lead layer, wherein the pad layer and the lead layer are respectively disposed on opposite sides of the substrate; The pixel unit includes a eutectic pad, a first pad, a second pad, and a third pad, wherein the eutectic pad, the first pad, the second pad, and the third pad belong to the pad layer; The pin layer includes a first common A-pole pin, a second common A-pole pin, a first red light pin, a second red light pin, a first green light pin, a second green light pin, a first blue light pin, and a second blue light pin; In the pixel unit, the red LED light-emitting chip, the green LED light-emitting chip, and the blue LED light-emitting chip are all fixed on the eutectic pad, and the A-pole of the red LED light-emitting chip, the green LED light-emitting chip, and the blue LED light-emitting chip are electrically connected to the eutectic pad, the B-pole of the red LED light-emitting chip is electrically connected to the first pad, the B-pole of the green LED light-emitting chip is electrically connected to the second pad, and the B-pole of the blue LED light-emitting chip is electrically connected to the third pad. In the first row of pixel units, the two eutectic pads are electrically connected and electrically connected to the first common A-pole pin; in the second row of pixel units, the two eutectic pads are electrically connected and electrically connected to the second common A-pole pin. In the first column of pixel units, two first pads are electrically connected and electrically connected to the first red light pin, two second pads are electrically connected and electrically connected to the first green light pin, and two third pads are electrically connected and electrically connected to the first blue light pin; in the second column of pixel units, two first pads are electrically connected and electrically connected to the second red light pin, two second pads are electrically connected and electrically connected to the second green light pin, and two third pads are electrically connected and electrically connected to the second blue light pin.

6. The LED display device according to claim 5, characterized in that: In the first row of pixel units, the two eutectic pads are electrically connected through a first metal trace located in the pad layer, and the eutectic pad of the second pixel unit is electrically connected to the first common A-pin through a first metal hole penetrating the substrate; in the second row of pixel units, the two eutectic pads are electrically connected through a second metal trace located in the pad layer, and the eutectic pad of the fourth pixel unit is electrically connected to the second common A-pin through a second metal hole penetrating the substrate. In the first column of pixel units, the first pad of the first pixel unit is electrically connected to the third metal trace and the first red light pin located on the pin layer through a third metal hole penetrating the substrate; the first pad of the fourth pixel unit is electrically connected to the third metal trace through a fourth metal hole penetrating the substrate; the second pads of the first pixel unit and the fourth pixel unit are electrically connected to each other through a fourth metal trace located on the pad layer; the second pad of the first pixel unit is electrically connected to the first green light pin through a fifth metal hole penetrating the substrate; the third pads of the first pixel unit and the fourth pixel unit are electrically connected to each other through a fifth metal trace located on the pad layer; the fifth metal trace is electrically connected to the first blue light pin through a sixth metal hole penetrating the substrate. In the second column of pixel units, the first pad of the second pixel unit and the first pad of the third pixel unit are electrically connected through a sixth metal trace located on the pad layer. The sixth metal trace is electrically connected to the second red light pin through a seventh metal hole penetrating the substrate. The second pad of the second pixel unit and the second pad of the third pixel unit are electrically connected through a seventh metal trace located on the pad layer. The seventh metal trace is electrically connected to an eighth metal trace located on the pin layer through an eighth metal hole penetrating the substrate. The eighth metal trace is electrically connected to the second green light pin. The third pad of the second pixel unit and the third pad of the third pixel unit are electrically connected through a ninth metal trace located on the pad layer. The ninth metal trace is electrically connected to the second blue light pin through a ninth metal hole penetrating the substrate.

7. The LED display device according to claim 5, characterized in that, A light-blocking layer is provided on the side of the pad layer away from the substrate. The light-blocking layer has an opening in the area where the pixel unit is located, exposing the LED light-emitting chip of the pixel unit. The opening is filled with light-transmitting encapsulating adhesive.

8. The LED display device according to claim 6, characterized in that, An insulating layer is provided on the side of the substrate away from the pad layer. The insulating layer covers the metal traces of the pin layer, and an opening is provided at the pin of the pin layer to expose the pin.

9. A display panel, characterized in that, It includes a circuit board and a plurality of LED display devices as described in any one of claims 1-8, wherein the plurality of LED display devices are arranged in an array on the circuit board.

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