LED light-emitting device and LED display module
By designing pixel units with different arrangement orders and uniformly distributed center point distances in LED light-emitting devices, the color shift problem in LED display modules is solved, improving the user's visual experience and color uniformity.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- UNILUMIN GRP
- Filing Date
- 2025-07-30
- Publication Date
- 2026-07-21
AI Technical Summary
In conventional LED light-emitting devices, because the pixel units are arranged vertically in a fixed color order, users can only see one color at the edge of the LED display module, resulting in a significant color bias problem at a large viewing angle, which affects the user's visual experience.
Design an LED light-emitting device in which the sub-pixel units of multiple pixel units near the same edge are arranged in different orders, and the center points of any two adjacent pixel units are equidistant. By adopting an alternating arrangement and uniform distribution, the device ensures that users can see at least two colors and improves color uniformity.
It improves the color deviation problem of LED light-emitting devices, enhances the user's visual experience, and ensures color uniformity and stability through uniformly distributed pixel units.
Smart Images
Figure CN224538665U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of display technology, and in particular to an LED light-emitting device and an LED display module. Background Technology
[0002] In conventional light-emitting diode (LED) display modules, the sub-pixel units within the built-in pixel unit are arranged vertically in a fixed color order, and different pixel units are arranged horizontally or vertically in parallel. This results in users only being able to see one color at the top and bottom edges of the LED light-emitting device, and not other colors, thus posing a significant risk of color bias in the field of view.
[0003] Therefore, improving the color deviation problem of LED light-emitting devices to enhance the user's visual experience is a technical problem that urgently needs to be solved by those in this field. Utility Model Content
[0004] The purpose of this invention is to provide an LED light-emitting device and an LED display module to solve the problem of color deviation in LED light-emitting devices, which leads to a poor visual experience for users.
[0005] To solve the above-mentioned technical problems, this utility model provides an LED light-emitting device, including a carrier plate and a plurality of pixel units disposed on the carrier plate. The pixel unit includes a plurality of sub-pixel units, and the plurality of sub-pixel units include a first sub-pixel unit, a second sub-pixel unit and a third sub-pixel unit with different light-emitting colors.
[0006] Among the multiple pixel units near the same edge of the LED light-emitting device, at least two of the pixel units have a different arrangement order of their sub-pixel units;
[0007] The distance between the center points of any two adjacent pixel units is equal.
[0008] For example, the second sub-pixel unit in the pixel unit is located between the first sub-pixel unit and the third sub-pixel unit.
[0009] For example, the first sub-pixel unit and the third sub-pixel unit in two adjacent pixel units are arranged in an alternating manner relative to the second sub-pixel unit.
[0010] For example, the LED light-emitting device further includes a package body disposed on the carrier plate and encapsulating a plurality of the pixel units.
[0011] For example, the center-to-center distance between two adjacent second sub-pixel units in the first direction is equal to the center-to-center distance between two adjacent second sub-pixel units in the second direction, wherein the first direction is perpendicular to the second direction.
[0012] For example, the center spacing between two adjacent second sub-pixel units in the first direction and the center spacing between two adjacent second sub-pixel units in the second direction are the center spacing between two adjacent pixel units.
[0013] For example, the LED light-emitting device further includes a pixel driving unit, and the pixel unit is electrically connected to the pixel driving unit.
[0014] For example, the LED light-emitting device includes four pixel units arranged in a matrix of two rows and two columns, and the pixel driving unit is located at the center of the rectangular area formed by the four pixel units.
[0015] To address the aforementioned technical problems, the present invention also provides an LED display module, comprising a plurality of the aforementioned LED light-emitting devices, wherein the plurality of LED light-emitting devices are arranged in an array.
[0016] For example, the center-to-center distance between adjacent pixel units of any two adjacent LED light-emitting devices is equal to the center-to-center distance between any two adjacent pixel units on each LED light-emitting device.
[0017] This utility model provides an LED light-emitting device, including a carrier plate and multiple pixel units disposed on the carrier plate. Each pixel unit includes multiple sub-pixel units. The multiple sub-pixel units include a first sub-pixel unit, a second sub-pixel unit, and a third sub-pixel unit that emit different colors. Among the pixel units near the same edge of the LED light-emitting device, at least two pixel units have sub-pixel units arranged in a different order, ensuring that the user can see at least two colors on the same edge of the LED light-emitting device, thus improving the color shift problem of the LED light-emitting device. Furthermore, the distance between the center points of any two adjacent pixel units is equal, improving the color uniformity of the LED light-emitting device.
[0018] In addition, this utility model also provides an LED display module, including the aforementioned LED light-emitting device, which has the same or corresponding technical features as the aforementioned LED light-emitting device and has the same effect. Attached Figure Description
[0019] To more clearly illustrate the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 A top view of an LED light-emitting device provided for an embodiment of this utility model;
[0021] Figure 2 for Figure 1 A side view of the LED light-emitting device shown;
[0022] Figure 3 A top view of another LED light-emitting device provided in an embodiment of this utility model;
[0023] Figure 4 This is a top view of an LED display module provided in an embodiment of the present utility model.
[0024] Figure label:
[0025] 1-Carrier board; 2-Pixel unit; 3-Package; 4-Pixel driving unit; 20-First sub-pixel unit; 21-Second sub-pixel unit; 22-Third sub-pixel unit; 100-LED light-emitting device; 10-LED display module. Detailed Implementation
[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0027] The core of this utility model is to provide an LED light-emitting device 100 and an LED display module 10 to solve the problem that the LED light-emitting device 100 has color deviation, resulting in a poor visual experience for users.
[0028] In a traditional LED display module 10, the sub-pixel units within a pixel unit are arranged in a fixed color order, and different pixel units are arranged horizontally or vertically in parallel. For example, a pixel unit may include a first sub-pixel unit, a second sub-pixel unit, and a third sub-pixel unit. The first sub-pixel unit is a red (R) sub-pixel unit, the second sub-pixel unit is a green (G) sub-pixel unit, and the third sub-pixel unit is a blue (B) sub-pixel unit. If the first, second, and third sub-pixel units within a pixel unit are arranged vertically in a fixed color order, and different pixel units are arranged horizontally or vertically in parallel, only the R color will be visible at the top edge of the LED display module 10, and only the B color will be visible at the bottom edge. This means that users will only see one color at the top and bottom edges of the LED display module 10, and will not see any other colors. Therefore, there is a significant risk of color bias in the viewing area.
[0029] Therefore, this utility model provides a new LED light-emitting device 100 to improve the color deviation problem of the LED light-emitting device 100, thereby improving the user's visual experience.
[0030] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Figure 1 A top view of an LED light-emitting device 100 provided in an embodiment of this utility model, as shown below. Figure 1 As shown, it includes a carrier plate 1 and a plurality of pixel units 2 disposed on the carrier plate 1. The pixel unit 2 includes a plurality of sub-pixel units, and the plurality of sub-pixel units include a first sub-pixel unit 20, a second sub-pixel unit 21 and a third sub-pixel unit 22 with different emission colors.
[0031] Among the multiple pixel units 2 near the same edge of the LED light-emitting device 100, at least two pixel units 2 have different arrangements of their sub-pixel units;
[0032] The distance between the center points of any two adjacent pixel units 2 is equal.
[0033] The number of pixel units in the LED light-emitting device 100 is not limited and is determined according to the actual situation. Each pixel unit 2 includes a first sub-pixel unit 20, a second sub-pixel unit 21, and a third sub-pixel unit 22. The first sub-pixel unit 20 is an R sub-pixel unit, including a red light-emitting chip; the second sub-pixel unit 21 is a G sub-pixel unit, including a green light-emitting chip; and the third sub-pixel unit 22 is a B sub-pixel unit, including a blue light-emitting chip. That is, one pixel unit 2 includes a red light-emitting chip, a green light-emitting chip, and a blue light-emitting chip.
[0034] To improve the color shift problem, in this embodiment, among the multiple pixel units 2 near the same edge of the LED light-emitting device 100, at least two pixel units 2 have a different arrangement order of their sub-pixel units. Here, the edge can refer to the top edge and the bottom edge, or it can be the left and right edges. Among the pixel units 2 near the top edge of the LED light-emitting device 100, at least two pixel units 2 have a different arrangement order of their sub-pixel units; among the pixel units 2 near the bottom edge of the LED light-emitting device 100, at least two pixel units 2 have a different arrangement order of their sub-pixel units.
[0035] For example, in the pixel units 2 near the upper edge of the LED light-emitting device 100, one pixel unit 2 has a vertical arrangement of the first sub-pixel unit 20, the second sub-pixel unit 21, and the third sub-pixel unit 22, while the other pixel unit 2 has a vertical arrangement of the third sub-pixel unit 22, the second sub-pixel unit 21, and the first sub-pixel unit 20. That is, the arrangement order of the sub-pixel units in these two pixel units 2 is different, allowing both the first and third colors to be seen simultaneously at the upper edge and at the lower edge. This improves the color shift problem of the LED light-emitting device 100.
[0036] Furthermore, to improve the color uniformity of the LED light-emitting device 100, the distance between the center points of any two adjacent pixel units 2 is set to be equal, such as... Figure 1 The distance 'a' represents the distance between any two adjacent pixel units 2. When the center points of any two adjacent pixel units 2 are equidistant, it means that the pixels are distributed in a regular and uniform array on the screen. This uniform spatial arrangement makes the pixel density within a unit area consistent, thus making the light intensity distribution of each pixel tend to be balanced across different areas of the screen. Because the pixel spacing is consistent, the brightness or color will not fluctuate due to local pixel density differences during the propagation and superposition of light. The color saturation and brightness of different parts of the image perceived by the human eye will also be more consistent, thereby effectively avoiding color patches or differences in brightness caused by uneven pixel arrangement, ultimately improving the color uniformity of the displayed image.
[0037] The LED light-emitting device 100 provided in this embodiment includes a carrier plate 1 and a plurality of pixel units 2 disposed on the carrier plate 1. Each pixel unit 2 includes a plurality of sub-pixel units. The plurality of sub-pixel units include a first sub-pixel unit 20, a second sub-pixel unit 21, and a third sub-pixel unit 22 that emit different colors. Among the pixel units 2 near the same edge of the LED light-emitting device 100, at least two pixel units 2 have a different arrangement order of their sub-pixel units, ensuring that the user can see at least two colors on the same edge of the LED light-emitting device 100, thus improving the color shift problem of the LED light-emitting device 100. In addition, the distance between the center points of any two adjacent pixel units 2 is equal, improving the color uniformity of the LED light-emitting device 100.
[0038] In implementation, the first sub-pixel unit 20, the second sub-pixel unit 21, and the third sub-pixel unit 22 in a pixel unit 2 can be arranged in different orders. For example, the order could be: RGB; RBG, GRB, GBR, BRG, or BGR. To further improve the user's visual experience, in some embodiments, the second sub-pixel unit 21 in pixel unit 2 is located between the first sub-pixel unit 20 and the third sub-pixel unit 22.
[0039] In other words, pixel unit 2 can be arranged in the order of first sub-pixel unit 20, second sub-pixel unit 21, and third sub-pixel unit 22, or in the order of third sub-pixel unit 22, second sub-pixel unit 21, and first sub-pixel unit 20. Since green is the color that the human eye is most sensitive to, placing the second sub-pixel unit 21 (i.e., the G sub-pixel unit) in the middle can better balance the human eye's perception of color, reduce color distortion, make the image look more natural and realistic, and improve the user's visual experience.
[0040] In some embodiments, the first sub-pixel unit 20 and the third sub-pixel unit 22 in two adjacent pixel units 2 are arranged in an alternating manner relative to the second sub-pixel unit 21. An alternating arrangement means that if one pixel unit is arranged in the order of the first sub-pixel unit 20, the second sub-pixel unit 21, and the third sub-pixel unit 22, then the other pixel unit 2 is arranged in the order of the third sub-pixel unit 22, the second sub-pixel unit 21, and the first sub-pixel unit 20. Specifically, in two adjacent pixel units 2, if one pixel unit 2 is arranged in RGB order, then the other pixel unit 2 is arranged in BGR order.
[0041] The pixel units 2 and pixel driving units 4 on the LED light-emitting device 100 are electronic components, which are susceptible to moisture and damage from impacts. Therefore, in some embodiments, the LED light-emitting device 100 also includes a package 3, which is disposed on the carrier plate 1 and encapsulates multiple pixel units 2. The package 3 can be made of resin, such as epoxy resin or other types of resin.
[0042] That is, multiple pixel units 2 are first integrated into the same package 3. Figure 2 for Figure 1 A side view of the LED light-emitting device 100 shown. (As shown) Figure 2 As shown, the package 3 is located on the carrier plate 1. The package 3 includes multiple pixel units 2.
[0043] To improve pixel uniformity, in some embodiments, the center-to-center distance between two adjacent second sub-pixel units 21 in the first direction is equal to the center-to-center distance between two adjacent second sub-pixel units 21 in the second direction, wherein the first direction is perpendicular to the second direction. For example, the first direction is horizontal and the second direction is vertical. The center-to-center distance between two adjacent second sub-pixel units 21 in the first direction and the center-to-center distance between two adjacent second sub-pixel units 21 in the second direction are the preset center-to-center distances between pixel units 2 on the LED light-emitting device 100. The preset center-to-center distances between pixel units on the LED light-emitting device 100 are not limited and are determined according to actual conditions.
[0044] When driving pixel unit 2, each pixel unit 2 requires a corresponding pixel driving unit 4. If a pixel driving unit 4 is set for each pixel unit 2 and connected to it, a large number of pixel driving units 4 are required, leading to increased cost and poor stability. Therefore, in some embodiments, the LED light-emitting device 100 further includes a pixel driving unit 4, and the pixel unit 2 is electrically connected to the pixel driving unit 4. In implementation, the pixel driving unit 4 can adopt strategies such as time-division multiplexing for pixel control, driving multiple pixel units 2 in a time-division manner through a single chip to ensure display effect. The pixel driving unit 4 can be a bare driving chip or a driving device after the driving chip has been packaged.
[0045] When multiple pixel units 2 correspond to one pixel driving unit 4, the significant advantage is that the number of pixel driving units 4 used can be greatly reduced, thereby reducing the hardware cost and circuit design complexity of the display LED light-emitting device 100. At the same time, the reduction in the number of pixel driving units 4 can reduce the size of the circuit board, simplify the wiring structure, improve the integration of the LED light-emitting device 100 and reduce power consumption. It can also reduce the failure points caused by an excessive number of pixel driving units 4 and improve system stability.
[0046] In some embodiments, the LED light-emitting device 100 includes four pixel units 2 arranged in a matrix of two rows and two columns, with the pixel driving unit 4 located at the center of the rectangular area formed by the four pixel units 2. This enables the one pixel driving unit 4 to drive the four pixel units 2. Furthermore, placing the pixel driving unit 4 at the center of the rectangular area formed by the four pixel units 2 utilizes a centrally symmetrical layout to ensure that the transmission path length of the driving signal to each pixel unit 2 is consistent, effectively reducing signal delay differences and ensuring the synchronization of the driving timing of the four pixel units 2, thus avoiding problems such as uneven brightness or color in the displayed image. Simultaneously, the central driving layout allows the wiring to extend radially to the surrounding pixels, simplifying circuit routing complexity, reducing the risk of line cross-interference, and improving the integration and stability of the LED module.
[0047] To enable those skilled in the art to better understand the LED light-emitting device 100 provided in this embodiment, the following description uses an example of a package 3 containing four pixel units 2 to further illustrate the embodiment of the LED light-emitting device 100. Figure 1 As shown, a package 3 includes one pixel driver unit 4 (Pixel Driver-IC) and four pixel units 2. The four pixel units 2 share one pixel driver unit 4. Assume that the pixel unit 2 in the lower left corner is Pixel #1, the pixel unit 2 in the upper left corner is Pixel #2, the pixel unit 2 in the upper right corner is Pixel #3, and the pixel unit 2 in the lower right corner is Pixel #4. The sub-pixel units in Pixel #1 are arranged from top to bottom as the third sub-pixel unit 22, the second sub-pixel unit 21, and the first sub-pixel unit 20; the sub-pixel units in Pixel #2 are arranged from top to bottom as the third sub-pixel unit 22, the second sub-pixel unit 21, and the first sub-pixel unit 20; the sub-pixel units in Pixel #3 are arranged from top to bottom as the first sub-pixel unit 20, the second sub-pixel unit 21, and the third sub-pixel unit 22; and the sub-pixel units in Pixel #4 are arranged from top to bottom as the first sub-pixel unit 20, the second sub-pixel unit 21, and the third sub-pixel unit 22. The distance between the center points of two adjacent pixel units 2 is a, which is equal to the pixel center spacing of the LED light-emitting device 100 to be implemented.
[0048] Figure 3 A top view of another LED light-emitting device 100 provided in an embodiment of this utility model. (See figure) Figure 3As shown, a package 3 includes one pixel driver unit 4 (Pixel Driver-IC) and four pixel units 2. The four pixel units 2 share one pixel driver unit 4. Similarly, assume that the pixel unit 2 in the lower left corner is Pixel #1, the pixel unit in the upper left corner is Pixel #2, the pixel unit in the upper right corner is Pixel #3, and the pixel unit in the lower right corner is Pixel #4. The sub-pixel units in Pixel #1 are arranged from top to bottom as the first sub-pixel unit 20, the second sub-pixel unit 21, and the third sub-pixel unit 22; the sub-pixel units in Pixel #2 are arranged from top to bottom as the third sub-pixel unit 22, the second sub-pixel unit 21, and the first sub-pixel unit 20; the sub-pixel units in Pixel #3 are arranged from top to bottom as the first sub-pixel unit 20, the second sub-pixel unit 21, and the third sub-pixel unit 22; and the sub-pixel units in Pixel #4 are arranged from top to bottom as the third sub-pixel unit 22, the second sub-pixel unit 21, and the first sub-pixel unit 20. The distance between the center points of two adjacent pixel units 2 is a, and is equal to the pixel center spacing of the LED light-emitting device 100 to be implemented. Figure 3 Not shown in the text, please refer to the details. Figure 1 ).
[0049] The color arrangement format of the aforementioned single-core driven quad-pixel integrated package physically comprises one pixel driver chip and four horizontally / vertically equidistant pixel units 2. Specifically, the pixel driver chip is placed within the central area of these four pixel units 2; the G sub-pixels are located at the center of each pixel, and their horizontal / vertical center spacing is the same as the pixel center spacing; the first sub-pixel unit 20 is physically located above or below the second sub-pixel unit 21, and is arranged in an alternating manner within each pixel unit 2; the third sub-pixel unit 22 is placed in the remaining positions within each pixel unit 2.
[0050] The integrated package 3 contains one pixel driver chip and four pixel units 2 driven by it. Each pixel unit 2 contains three sub-pixel units: R, G, and B. The four G sub-pixels are equidistant horizontally and vertically, and their spacing is equal to the center-to-center pixel spacing of the LED display module 10. The four R sub-pixels or four B sub-pixels are arranged in a staggered horizontally and vertically relative to the G sub-pixels, ensuring that at least two display colors are visible on each of the four edges of the LED display module 10. Compared to conventional LED light-emitting devices 100, which only display one color on each of their two edges, this improves the color bias problem at large viewing angles.
[0051] The above describes an LED light-emitting device 100. This embodiment also provides an LED display module 10. The LED display module 10 includes a plurality of the above-described LED light-emitting devices 100, and the plurality of LED light-emitting devices 100 are arranged in an array. Figure 4 This is a top view of an LED display module 10 provided in an embodiment of the present invention. Figure 4 As shown, the LED display module 10 includes the LED light-emitting device 100 described above. The embodiments of the LED light-emitting device 100 have been described in detail above, and the embodiments of the LED display module 10 will not be repeated here.
[0052] In some embodiments, in the LED display module 10, the center-to-center distance between any two adjacent LED light-emitting devices 100 and their adjacent pixel units 2 is equal to the center-to-center distance between any two adjacent pixel units 2 on each LED light-emitting device 100. By designing that the distance between the center points of any two adjacent pixel units 2 is equal, and that the center-to-center distance between any two adjacent LED light-emitting devices 100 and their adjacent pixel units 2 is equal to the center-to-center distance between any two adjacent pixel units 2 on each LED light-emitting device 100, the pixel units 2 of the LED display module 10 are uniformly arranged, improving the uniformity of color display and enhancing the user's visual experience.
[0053] The LED display module 10 provided in this embodiment includes the aforementioned LED light-emitting device 100. The LED light-emitting device 100 includes a carrier plate 1 and a plurality of pixel units 2 disposed on the carrier plate 1. Each pixel unit 2 includes a plurality of sub-pixel units. The plurality of sub-pixel units include a first sub-pixel unit 20, a second sub-pixel unit 21, and a third sub-pixel unit 22, each emitting a different color. Among the pixel units 2 near the same edge of the LED light-emitting device 100, at least two pixel units 2 have sub-pixel units arranged in a different order, ensuring that the user can see at least two colors on the same edge of the LED light-emitting device 100, thus improving the color shift problem of the LED light-emitting device 100. Furthermore, the distance between the center points of any two adjacent pixel units 2 is equal, improving the color uniformity of the LED light-emitting device 100.
[0054] The present invention provides a detailed description of an LED light-emitting device and an LED display module. The various embodiments are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the present invention.
[0055] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
Claims
1. An LED light emitting device, characterized by, The LED light-emitting device comprises a carrier plate and a plurality of pixel units arranged on the carrier plate, the pixel units comprise a plurality of sub-pixel units, the plurality of sub-pixel units comprise first, second and third sub-pixel units with different light-emitting colors; In the plurality of pixel units close to the same edge of the LED light-emitting device, the arrangement sequence of the sub-pixel units of at least two pixel units is different; The distance between the center points of any two adjacent pixel units is equal.
2. The LED light emitting device of claim 1, wherein, The second sub-pixel unit is located between the first and third sub-pixel units in the pixel unit.
3. The LED light emitting device of claim 2, wherein, The first and third sub-pixel units in the adjacent two pixel units are staggered relative to the second sub-pixel unit.
4. The LED light emitting device of claim 3, wherein, The LED light-emitting device further comprises a package arranged on the carrier plate and wrapping the plurality of pixel units.
5. The LED light emitting device of claim 4, wherein, The center distance between the adjacent two second sub-pixel units in the first direction is equal to the center distance between the adjacent two second sub-pixel units in the second direction, wherein the first direction is perpendicular to the second direction.
6. The LED light emitting device of claim 5, wherein, The center distance between the adjacent two second sub-pixel units in the first direction and the center distance between the adjacent two second sub-pixel units in the second direction are the center distance between the adjacent two pixel units.
7. The LED light emitting device according to any one of claims 4 to 6, wherein, The LED light-emitting device further comprises a pixel driving unit, and the pixel units are electrically connected to the pixel driving unit.
8. The LED light emitting device of claim 7, wherein, The LED light-emitting device comprises four pixel units arranged in a matrix form of two rows and two columns, and the pixel driving unit is located at the center of the rectangular region formed by the four pixel units.
9. An LED display module, characterized in that, The LED light-emitting device comprises a plurality of LED light-emitting devices arranged in an array.
10. The LED display module of claim 9, wherein, The center distance between the adjacent pixel units of any two adjacent LED light-emitting devices is equal to the center distance between any two adjacent pixel units on each LED light-emitting device.