A light emitting device

Abstract

The application discloses a light-emitting device, comprising: a first light-emitting unit comprising at least two sub light-emitting units, each sub light-emitting unit being electrically connected with an external pin through a lead, and the leads of the sub light-emitting units in the same first light-emitting unit being connected with the same external pin; the at least two sub light-emitting units of the same first light-emitting unit comprising a first sub light-emitting unit and at least one second sub light-emitting unit, the light-emitting areas of the first sub light-emitting unit and the second sub light-emitting unit being different, the first sub light-emitting unit being the sub light-emitting unit with the smallest light-emitting area among the at least two sub light-emitting units; the light-emitting area of the first sub light-emitting unit being S1, the light-emitting area of the second sub light-emitting unit being S, the resistance of the lead connected with the first sub light-emitting unit being R1, and the resistance of the lead connected with the second sub light-emitting unit being R; when the ratio of R1 to the equivalent resistance of the first sub light-emitting unit is different, the ratio of R1 / R to S / S1 is different. The application improves the light-emitting uniformity of the light-emitting device.

Description

Technical Field

[0001] This invention relates to the field of organic light-emitting technology, and more particularly to a light-emitting device. Background Technology

[0002] With the development of organic light-emitting technology, the requirements for the luminous uniformity of organic light-emitting diode (OLED) devices are becoming increasingly stringent. However, as the luminous area of ​​OLED devices increases, the required luminous uniformity cannot be met. Summary of the Invention

[0003] The present invention provides a light-emitting device to improve the light emission uniformity of the light-emitting device.

[0004] According to one aspect of the present invention, a light-emitting device is provided, comprising:

[0005] A substrate and at least one first light-emitting unit disposed on the substrate; the first light-emitting unit includes at least two sub-light-emitting units, each of the sub-light-emitting units being electrically connected to an external pin via a lead wire, the lead wire of the sub-light-emitting unit in the same first light-emitting unit being connected to the same external pin, the external pin being used to transmit a driving signal to the first light-emitting unit;

[0006] The first light-emitting unit has at least two sub-light-emitting units, including a first sub-light-emitting unit and at least one second sub-light-emitting unit. The light-emitting areas of the first sub-light-emitting unit and the second sub-light-emitting unit are different. The first sub-light-emitting unit is the sub-light-emitting unit with the smallest light-emitting area among the at least two sub-light-emitting units.

[0007] The light-emitting area of ​​the first sub-light-emitting unit is S1, the light-emitting area of ​​the second sub-light-emitting unit is S, the resistance of the lead wire connected to the first sub-light-emitting unit is R1, and the resistance of the lead wire connected to the second sub-light-emitting unit is R.

[0008] When the ratio of R1 to the equivalent resistance of the first sub-light-emitting unit is different, the ratio of R1 / R to S / S1 is different.

[0009] Optionally, when the ratio of R1 to the equivalent resistance of the first sub-light-emitting unit is in different first ratio ranges, the ratio of R1 / R to S / S1 is in different second ratio ranges; wherein each first ratio range corresponds to a second ratio range.

[0010] Optionally, when the ratio of R1 to the equivalent resistance of the first sub-light-emitting unit is less than or equal to one-thousandth, R1 / R ≥ 0.1*S / S1;

[0011] When the ratio of R1 to the equivalent resistance of the first sub-light-emitting unit is greater than one-thousandth and less than or equal to one-hundredth, 0.5*S / S1≤R1 / R≤5*S / S1.

[0012] When the ratio of R1 to the equivalent resistance of the first sub-light-emitting unit is greater than one percent, 0.8*S / S1≤R1 / R≤1.5*S / S1.

[0013] Optionally, the lead wire connected to the first sub-light-emitting unit may have at least one different lead wire width, lead wire length, and lead wire thickness from the lead wire connected to the second sub-light-emitting unit.

[0014] Optionally, at least two sub-light-emitting units in the same first light-emitting unit emit the same color.

[0015] Optionally, the light-emitting device is characterized by further comprising:

[0016] The second light-emitting unit is disposed on the substrate, and at least one second light-emitting unit is disposed between adjacent sub-light-emitting units;

[0017] The second light-emitting unit is electrically connected to an external pin via a lead wire. The external pin connected to the second light-emitting unit is different from that of the first light-emitting unit.

[0018] The lead wire extends directly to the location of the external pin and is electrically connected to the external pin.

[0019] Optionally, the substrate is further provided with a grid-shaped signal transmission line, the sub-light-emitting unit is disposed in the grid of the grid-shaped signal transmission line, different sub-light-emitting units are disposed in different grids, and the lead is electrically connected to the external pin through the grid-shaped signal transmission line.

[0020] Optionally, the light-emitting device further includes:

[0021] A driver circuit board is connected to the external pin and is used to send drive signals to the external pin.

[0022] Optionally, the sub-light-emitting unit includes a first electrode, a light-emitting functional layer, and a second electrode stacked sequentially. The second electrode is disposed on the side of the light-emitting functional layer away from the substrate, and the first electrode is electrically connected to the external pin through the lead.

[0023] Optionally, the light-emitting functional layer includes a first functional layer, an organic light-emitting layer, and a second functional layer stacked sequentially; the first functional layer is disposed on the side of the organic light-emitting layer adjacent to the first electrode;

[0024] The first functional layer includes at least one of an electron injection layer, an electron transport layer, and a hole blocking layer; the second functional layer includes at least one of a hole injection layer, a hole transport layer, and an electron blocking layer; or, the second functional layer includes at least one of an electron injection layer, an electron transport layer, and a hole blocking layer, and the first functional layer includes at least one of a hole injection layer, a hole transport layer, and an electron blocking layer.

[0025] In this embodiment, the resistance R of the lead wire of the first sub-light-emitting unit with the smallest light-emitting area is used as a reference. The resistance R of the lead wire of the second sub-light-emitting unit is determined by combining the light-emitting area S1 of the first sub-light-emitting unit and the light-emitting area S of the second sub-light-emitting unit. By setting different ratios of R1 and the equivalent resistance of the first sub-light-emitting unit, the ratio of R1 / R to S / S1 is also different. This ensures that the resistances R1 and R of the lead wires of the first and second sub-light-emitting units are matched with the light-emitting areas S1 and S of the first and second sub-light-emitting units, respectively. This results in the same or similar current density for the first and second sub-light-emitting units when the external pin transmits the drive signal, leading to the same or similar brightness of the first and second sub-light-emitting units and improving the uniformity of light emission.

[0026] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of a light-emitting device provided in an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of another light-emitting device provided in an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of another light-emitting device provided in an embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of another light-emitting device provided in an embodiment of the present invention;

[0032] Figure 5 yes Figure 4 A cross-sectional view of the light-emitting device along section line AA. Detailed Implementation

[0033] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0034] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0035] As mentioned in the background technology, the number of light-emitting areas in OLED light-emitting devices is increasing, and the uniformity of light emission cannot meet the requirements. The inventors discovered through research that the reason for this problem is that some light-emitting areas with different light-emitting areas in the light-emitting device are connected to the same external pin and receive driving signals through the same external pin to light up simultaneously. Since the areas of the light-emitting areas connected to the same external pin are different, the current density of the different light-emitting areas is different, resulting in inconsistent light emission brightness and affecting the uniformity of light emission of the light-emitting device.

[0036] This invention provides a light-emitting device. Figure 1 This is a schematic diagram of a light-emitting device provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of another light-emitting device provided in an embodiment of the present invention, with reference to... Figure 1 and Figure 2 The light-emitting device includes:

[0037] The substrate 100 and at least one first light-emitting unit 10 disposed on the substrate 100; the first light-emitting unit 10 includes at least two sub-light-emitting units 101, each sub-light-emitting unit 101 is electrically connected to an external pin 40 via a lead 30, and the lead 30 of the sub-light-emitting unit 101 in the same first light-emitting unit 10 is connected to the same external pin 40, and the external pin 40 is used to transmit a driving signal to the first light-emitting unit 10;

[0038] The first light-emitting unit 10 has at least two sub-light-emitting units 101 including a first sub-light-emitting unit 11 and at least one second sub-light-emitting unit 12. The light-emitting areas of the first sub-light-emitting unit 11 and the second sub-light-emitting unit 12 are different. The first sub-light-emitting unit 11 is the sub-light-emitting unit 101 with the smallest light-emitting area among the at least two sub-light-emitting units 12.

[0039] The light-emitting area of ​​the first sub-light-emitting unit 11 is S1, the light-emitting area of ​​the second sub-light-emitting unit 12 is S, the resistance of the lead 30 connected to the first sub-light-emitting unit 11 is R1, and the resistance of the lead 30 connected to the second sub-light-emitting unit 12 is R.

[0040] When the ratio of R1 to the equivalent resistance of the first sub-light-emitting unit 11 is different, the ratio of R1 / R to S / S1 is different.

[0041] The substrate 100 can be either a flexible or rigid substrate. The material of the substrate 100 can be glass or polyimide, etc. The first light-emitting unit 10 can include two or more sub-light-emitting units 101. The two or more sub-light-emitting units 101 are connected to the same external pin 40 via their respective leads 30. When the external pin 40 receives a driving signal, it transmits it to each sub-light-emitting unit 101 via the leads 30. The two or more sub-light-emitting units 101 connected to the same external pin 40 simultaneously illuminate. Figure 2 The diagram illustrates a first light-emitting unit 10 comprising two sub-light-emitting units 101. Figure 3 The diagram illustrates a first light-emitting unit 10 comprising three sub-light-emitting units 101. At least some of the sub-light-emitting units 101 within the first light-emitting unit 10 have different luminous areas. The first sub-light-emitting unit 11 is the sub-light-emitting unit 101 with the smallest luminous area among the at least two sub-light-emitting units 101 included in the first light-emitting unit 10; the number of first sub-light-emitting units 11 can be one or more. The second sub-light-emitting units 12 are other sub-light-emitting units 101 within the at least two sub-light-emitting units 101 included in the first light-emitting unit 10 whose luminous area is larger than that of the first sub-light-emitting unit 11; the number of second sub-light-emitting units 12 can be one or more. For example, if the first light-emitting unit 10 comprises three sub-light-emitting units 101, where one sub-light-emitting unit 101 has a smaller luminous area and the other two sub-light-emitting units 101 have larger luminous areas, then the first light-emitting unit 10 comprises one first sub-light-emitting unit 11 and two second sub-light-emitting units 12.

[0042] Each sub-light-emitting unit 101 may include an anode, a cathode, and an organic light-emitting layer disposed between the anode and the cathode. The anode of each sub-light-emitting unit 101 is electrically connected to the lead wire 30, and the cathode of each first light-emitting unit 10 is a solid layer structure, or the cathode of each sub-light-emitting unit 101 is electrically connected to the lead wire 30, and the anode of each first light-emitting unit 10 is a solid layer structure.

[0043] Specifically, since each sub-light-emitting unit 101 in the same first light-emitting unit 10 is connected to the same external pin 40, after the external pin 40 transmits the drive signal, the current of each sub-light-emitting unit 101 is shunted. When the light-emitting areas of each sub-light-emitting unit 101 are different, the equivalent resistance of the different sub-light-emitting units 101 is different. When the impedance of the lead 30 and the sub-light-emitting unit 101 is mismatched, the current density of each sub-light-emitting unit 101 differs greatly, and the brightness of the light emitted varies greatly. Among the sub-light-emitting units 101, the first sub-light-emitting unit 11 with the smallest light-emitting area has the largest resistance, and its brightness is most easily affected.

[0044] In this embodiment, the resistance R1 of the lead 30 of the first sub-light-emitting unit 11 with the smallest light-emitting area is used as a reference. The resistance R of the lead 30 of the second sub-light-emitting unit 12 is determined by combining the light-emitting area S1 of the first sub-light-emitting unit 11 and the light-emitting area S of the second sub-light-emitting unit 12. By setting the ratio of R1 to the equivalent resistance of the first sub-light-emitting unit 11 to be different, the ratio of R1 / R to S / S1 is also different. This ensures that the resistance R1 of the lead of the first sub-light-emitting unit 11 and the resistance R of the lead of the second sub-light-emitting unit 12 are matched with the light-emitting areas S1 of the first sub-light-emitting unit 11 and S of the second sub-light-emitting unit 12, respectively. This results in the current density of the first sub-light-emitting unit 11 and the second sub-light-emitting unit 12 being the same or similar when the external pin 40 transmits the drive signal, and consequently, the light emission brightness of the first sub-light-emitting unit 11 and the second sub-light-emitting unit 12 being the same or similar, thus improving the light emission uniformity of the light-emitting device.

[0045] Based on the above embodiments, optionally, when the ratio of R1 to the equivalent resistance of the first sub-light-emitting unit 11 is in different first ratio ranges, the ratio of R1 / R to S / S1 is in different second ratio ranges; wherein, each first ratio range corresponds to a second ratio range.

[0046] Specifically, when the ratio of R1 to the equivalent resistance of the first sub-light-emitting unit 11 is within different first ratio ranges, the current shunting of the first sub-light-emitting unit 11 is different, resulting in different current densities. Therefore, the second sub-light-emitting unit 12 needs to be equipped with different lead resistances to make its current density similar to or the same as that of the first light-emitting unit 11. By setting the ratio of R1 to the equivalent resistance of the first sub-light-emitting unit 11 to be within different first ratio ranges, the ratio of R1 / R to S / S1 is within different second ratio ranges, making the current density of the second sub-light-emitting unit 12 similar to or the same as that of the first sub-light-emitting unit 11, thus ensuring that the luminous brightness of the second sub-light-emitting unit 12 is the same as that of the first sub-light-emitting unit 11.

[0047] Based on the above embodiments, optionally, when the ratio of R1 to the equivalent resistance of the first sub-light-emitting unit 11 is less than or equal to one-thousandth, R1 / R ≥ 0.1*S / S1;

[0048] When the ratio of R1 to the equivalent resistance of the first sub-light-emitting unit 11 is greater than one-thousandth and less than or equal to one-hundredth, 0.5*S / S1≤R1 / R≤5*S / S1.

[0049] When the ratio of R1 to the equivalent resistance of the first sub-light-emitting unit 11 is greater than one percent, 0.8*S / S1≤R1 / R≤1.5*S / S1.

[0050] The inventors verified the lead resistance through simulation experiments. Table 1 shows the luminous area S1 of the first sub-light-emitting unit and the luminous area S of the second sub-light-emitting unit, as well as the equivalent resistance data. Table 2 shows the lead resistance R1 of the first sub-light-emitting unit and the lead resistance R of the second sub-light-emitting unit, as well as the brightness data.

[0051] Table 1

[0052]

[0053] Table 2

[0054]

[0055] Referring to Tables 1 and 2, when R1 is less than 1‰ of the equivalent resistance of the first light-emitting unit, R1 / R is set to ≥ 0.1 * S / S1, i.e., R1 / R ≥ 1.6. For example, when R1 / R = 6, the luminance ratio of the first sub-light-emitting unit to the second sub-light-emitting unit is 1.02. When R1 / R is not within the above range, for example, when R1 / R = 1.5, the luminance ratio of the first sub-light-emitting unit to the second sub-light-emitting unit is 1.12. Therefore, when the ratio of R1 to the equivalent resistance of the first sub-light-emitting unit is less than or equal to one-thousandth, R1 / R ≥

[0056] When the brightness of the first and second sub-light-emitting units is 0.1*S / S1, the brightness of the first and second sub-light-emitting units tends to be consistent, and the light emission uniformity of the light-emitting device is better.

[0057] When the ratio of R1 to the equivalent resistance is within 1‰-1%, the setting is 0.5*S / S1≤R1 / R≤5*S / S1, i.e., 8≤R1 / R≤80. For example, when R1 / R = 10, the luminous intensity ratio of the first sub-light-emitting unit and the second sub-light-emitting unit is 1.02; when R1 / R = 50, the luminous intensity ratio of the first sub-light-emitting unit and the second sub-light-emitting unit is 1.01. When R1 / R is outside the above range, such as when R1 / R = 5, the luminous intensity ratio of the first sub-light-emitting unit and the second sub-light-emitting unit is 1.05. Therefore, when the ratio of R1 to the equivalent resistance of the first sub-light-emitting unit is greater than one-thousandth and less than or equal to one-hundredth, and when 0.5*S / S1≤R1 / R≤5*S / S1, the brightness of the first and second sub-light-emitting units tends to be consistent, and the luminous uniformity of the light-emitting device is better.

[0058] R1 is greater than 1% of the equivalent resistance, and 0.8*S / S1 ≤ R1 / R ≤ 1.5*S / S1, i.e., 12.8 ≤ R1 / R ≤ 24. For example, R1 / R = 17.64705882, and the luminance ratio of the first sub-light-emitting unit to the second sub-light-emitting unit is 1.004. If R1 / R is outside this range, such as when R1 / R = 10, the luminance ratio of the first sub-light-emitting unit to the second sub-light-emitting unit is 1.07; when R1 / R = 37.5, the luminance ratio of the first sub-light-emitting unit to the second sub-light-emitting unit is 1.06. Therefore, when the ratio of R1 to the equivalent resistance of the first sub-light-emitting unit is greater than one percent, and 0.8*S / S1 ≤ R1 / R ≤ 1.5*S / S1, the brightness of the first and second sub-light-emitting units tends to be consistent, resulting in better luminous uniformity of the light-emitting device.

[0059] Based on the above embodiments, optionally, the lead wire 30 connected to the first sub-light-emitting unit 11 and the lead wire 30 connected to the second sub-light-emitting unit 12 may have at least one different lead wire width, lead wire length and lead wire thickness.

[0060] Specifically, the resistance of the lead wire 30 can be adjusted by setting the lead wire width, lead wire length and lead wire thickness, so that the lead wire resistance of the first sub-light-emitting unit 11 and the second sub-light-emitting unit 12 meets the above ratio requirements.

[0061] Based on the above embodiments, optionally, at least two sub-light-emitting units 101 in the same first light-emitting unit 10 emit the same color.

[0062] Specifically, the luminous efficiency of sub-light-emitting units 101 with the same luminous color is the same, and the luminous color of at least two sub-light-emitting units 101 in the same first light-emitting unit 10 is the same, so that when at least two sub-light-emitting units 101 are lit at the same time, the brightness tends to be consistent through the above-mentioned resistor setting, thereby improving the luminous uniformity.

[0063] Based on the above embodiments, optionally, the light-emitting device further includes:

[0064] The second light-emitting unit 20 is disposed on the substrate 100, and at least one second light-emitting unit 20 is disposed between adjacent sub-light-emitting units 101;

[0065] The second light-emitting unit 20 is electrically connected to the external pin 40 via the lead 30. The external pin 40 connected to the second light-emitting unit 20 is different from that connected to the first light-emitting unit 40.

[0066] Lead 30 extends directly to the location of external pin 40 and is electrically connected to external pin 40.

[0067] Specifically, each sub-light-emitting unit 101 is directly electrically connected to the external pin 40 via a lead 30. The second light-emitting unit 20 may include one sub-light-emitting unit 101, or it may include two or more sub-light-emitting units 101. When the second light-emitting unit 20 includes one sub-light-emitting unit 101, the second light-emitting unit 20 is located between the two sub-light-emitting units 101 of the first light-emitting unit 10. When the second light-emitting unit 20 includes two or more sub-light-emitting units 101, one sub-light-emitting unit 101 of the second light-emitting unit 20 is located between the two sub-light-emitting units 101 of the first light-emitting unit 10.

[0068] Figure 3 This is a schematic diagram of another light-emitting device provided in an embodiment of the present invention, with reference to... Figure 3 Based on the above embodiments, optionally, a grid-shaped signal transmission line 60 is also provided on the substrate 100, and the sub-light-emitting unit 101 is disposed in the grid of the grid-shaped signal transmission line 60. Different sub-light-emitting units 101 are disposed in different grids, and the lead wire 30 is electrically connected to the external pin 40 through the grid-shaped signal transmission line 60.

[0069] Specifically, the lead wire 30 is arranged together with the sub-light-emitting unit 101 within the grid. One end of the lead wire 30 is connected to the sub-light-emitting unit 101, and the other end is electrically connected to the signal transmission line 60. Each first light-emitting unit 10 corresponds to one signal transmission line 60, and different first light-emitting units 10 correspond to different signal transmission lines 60.

[0070] Figure 4 This is a schematic diagram of another light-emitting device provided in an embodiment of the present invention, with reference to... Figure 4In addition to the above embodiments, optionally, the light-emitting device further includes:

[0071] The driver circuit board 50 is bonded to the external pin 40 and is used to send drive signals to the external pin 40.

[0072] Specifically, multiple external pins 40 are located in the frame area of ​​the light-emitting device. The driving circuit board 50 can be a flexible circuit board or a non-flexible circuit board. After receiving the lighting command, the driving circuit board 50 sends a driving signal to the corresponding external pin 40 to control the corresponding light-emitting unit to light up.

[0073] Figure 5 yes Figure 4 A cross-sectional view of the light-emitting device along section line AA, for reference. Figure 5 and Figure 4 Based on the above embodiments, optionally, the sub-light-emitting unit 101 includes a first electrode 51, a light-emitting functional layer 52 and a second electrode 53 stacked in sequence. The second electrode 53 is disposed on the side of the light-emitting functional layer 52 away from the substrate 10, and the first electrode 51 is electrically connected to the external pin 40 through the lead wire 30.

[0074] In this configuration, the first electrode 51 is the anode and the second electrode 53 is the cathode, or the first electrode 51 is the cathode and the second electrode 53 is the anode. The second electrode 53 of the first light-emitting unit 10 and the second light-emitting unit 20 can be an integral structure.

[0075] Based on the above embodiments, optionally, the light-emitting functional layer 52 includes a first functional layer, an organic light-emitting layer and a second functional layer stacked sequentially; the first functional layer is disposed on the side of the organic light-emitting layer adjacent to the first electrode 51;

[0076] The first functional layer includes at least one of an electron injection layer, an electron transport layer, and a hole blocking layer.

[0077] The second functional layer includes at least one of a hole injection layer, a hole transport layer, and an electron blocking layer; or, the second functional layer includes at least one of an electron injection layer, an electron transport layer, and a hole blocking layer, and the first functional layer includes at least one of a hole injection layer, a hole transport layer, and an electron blocking layer.

[0078] When the first electrode 51 is the cathode and the second electrode 53 is the anode, the first functional layer includes at least one of an electron injection layer, an electron transport layer, and a hole blocking layer, and the second functional layer includes at least one of a hole injection layer, a hole transport layer, and an electron blocking layer.

[0079] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0080] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A light-emitting device, characterized in that, include: A substrate and at least one first light-emitting unit disposed on the substrate; the first light-emitting unit includes at least two sub-light-emitting units, each of the sub-light-emitting units being electrically connected to an external pin via a lead wire, the lead wire of the sub-light-emitting unit in the same first light-emitting unit being connected to the same external pin, the external pin being used to transmit a driving signal to the first light-emitting unit; The first light-emitting unit has at least two sub-light-emitting units, including a first sub-light-emitting unit and at least one second sub-light-emitting unit. The light-emitting areas of the first sub-light-emitting unit and the second sub-light-emitting unit are different. The first sub-light-emitting unit is the sub-light-emitting unit with the smallest light-emitting area among the at least two sub-light-emitting units. The light-emitting area of ​​the first sub-light-emitting unit is S1, the light-emitting area of ​​the second sub-light-emitting unit is S, the resistance of the lead wire connected to the first sub-light-emitting unit is R1, and the resistance of the lead wire connected to the second sub-light-emitting unit is R. When the ratio of R1 to the equivalent resistance of the first sub-light-emitting unit is different, and The ratios are different; When the ratio of R1 to the equivalent resistance of the first sub-light-emitting unit is less than or equal to one-thousandth, ; When the ratio of R1 to the equivalent resistance of the first sub-light-emitting unit is greater than one-thousandth and less than or equal to one-hundredth, ; When the ratio of R1 to the equivalent resistance of the first sub-light-emitting unit is greater than one percent, .

2. The light-emitting device according to claim 1, characterized in that: The lead wire connected to the first sub-light-emitting unit is different from the lead wire width, lead wire length, and lead wire thickness of the lead wire connected to the second sub-light-emitting unit.

3. The light-emitting device according to claim 1, characterized in that: At least two sub-light-emitting units within the same first light-emitting unit emit the same color.

4. The light-emitting device according to claim 1, characterized in that, Also includes: The second light-emitting unit is disposed on the substrate, and at least one second light-emitting unit is disposed between adjacent sub-light-emitting units; The second light-emitting unit is electrically connected to an external pin via a lead wire. The external pin connected to the second light-emitting unit is different from that of the first light-emitting unit. The lead wire extends directly to the location of the external pin and is electrically connected to the external pin.

5. The light-emitting device according to claim 1, characterized in that: The substrate is also provided with a grid-shaped signal transmission line, and the sub-light-emitting unit is disposed in the grid of the grid-shaped signal transmission line. Different sub-light-emitting units are disposed in different grids, and the lead wire is electrically connected to the external pin through the grid-shaped signal transmission line.

6. The light-emitting device according to claim 1, characterized in that, Also includes: A driver circuit board is connected to the external pin and is used to send drive signals to the external pin.

7. The light-emitting device according to claim 1, characterized in that: The sub-light-emitting unit includes a first electrode, a light-emitting functional layer, and a second electrode stacked sequentially. The second electrode is disposed on the side of the light-emitting functional layer away from the substrate, and the first electrode is electrically connected to the external pin through the lead wire.

8. The light-emitting device according to claim 7, characterized in that: The light-emitting functional layer includes a first functional layer, an organic light-emitting layer, and a second functional layer stacked sequentially; the first functional layer is disposed on the side of the organic light-emitting layer adjacent to the first electrode; The first functional layer includes at least one of an electron injection layer, an electron transport layer, and a hole blocking layer; the second functional layer includes at least one of a hole injection layer, a hole transport layer, and an electron blocking layer; or, the second functional layer includes at least one of an electron injection layer, an electron transport layer, and a hole blocking layer, and the first functional layer includes at least one of a hole injection layer, a hole transport layer, and an electron blocking layer.

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