Light-emitting device

Abstract

The invention discloses a light-emitting device which is characterized in that a first light-emitting unit comprises at least two light-emitting sub-units, each light-emitting sub-unit is electrically connected with an external pin through a lead, and the leads of the light-emitting sub-units in the same first light-emitting unit are connected with the same external pin; the at least two sub-light-emitting units of the same first light-emitting unit comprise 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, and the first sub-light-emitting unit is the sub-light-emitting unit with the smallest light-emitting area in the at least two sub-light-emitting units; the light-emitting area of the first light-emitting sub-unit is S1, the light-emitting area of the second light-emitting sub-unit is S, the resistance of the lead connected with the first light-emitting sub-unit is R1, and the resistance of the lead connected with the second light-emitting sub-unit is R; and 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 light-emitting uniformity of the light-emitting device is improved.

Description

Technical Field

[0001] The present invention relates to the field of organic light emitting technology, and in particular to a light emitting device. Background Art

[0002] With the development of organic light-emitting technology, people have higher and higher requirements on the uniformity of light emission of organic light-emitting diode (OLED) light-emitting devices. However, the light-emitting areas of OLED light-emitting devices are increasing, and the uniformity of light emission cannot meet the requirements. Summary of the invention

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

[0004] According to one aspect of the present invention, there is provided a light emitting device, 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 is electrically connected to an external pin through a lead, the leads of the sub-light-emitting units in the same first light-emitting unit are connected to the same external pin, and the external pin is used to transmit a driving signal to the first light-emitting unit;

[0006] The at least two sub-light emitting units of the same first light emitting unit include a first sub-light emitting unit and at least one second sub-light emitting unit, the first sub-light emitting unit and the second sub-light emitting unit have different light emitting areas, and the first sub-light emitting unit is a 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 connected to the first sub-light emitting unit is R1, and the resistance of the lead 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 a different first ratio range, the ratio of R1 / R to S / S1 is in a different second ratio range; 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 1%, 0.8*S / S1≤R1 / R≤1.5*S / S1.

[0013] Optionally, at least one of a lead width, a lead length and a lead thickness of a lead connected to the first sub-light-emitting unit and a lead connected to the second sub-light-emitting unit is different.

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

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

[0016] A second light-emitting unit disposed on the substrate, wherein 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, and the second light emitting unit is connected to a different external pin than the first light emitting unit;

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

[0019] Optionally, a grid-shaped signal transmission line is also provided on the substrate, the sub-light-emitting unit is arranged in the grid of the grid-shaped signal transmission line, different sub-light-emitting units are arranged 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 driving circuit board is bound and connected to the external pins, and is used to send a driving signal to the external pins.

[0022] Optionally, the sub-light-emitting unit includes a first electrode, a light-emitting functional layer and a second electrode which are stacked in sequence, the second electrode is arranged on a 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 which are stacked in sequence; the first functional layer is arranged on a 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, and 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 of the first sub-light-emitting unit with the smallest light-emitting area is used as a reference, and the resistance R of the lead of the second sub-light-emitting unit is determined in combination with 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. 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, so that the resistance R1 of the lead of the first sub-light-emitting unit and the resistance R of the lead of the second sub-light-emitting unit are matched with 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, respectively, so that when the external pin transmits the driving signal, the current density of the first sub-light-emitting unit and the second sub-light-emitting unit are the same or similar, so that the light-emitting brightness of the first sub-light-emitting unit and the second sub-light-emitting unit are the same or similar, and the light-emitting uniformity of the light-emitting device is improved.

[0026] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

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

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

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

[0031] Figure 4 is a schematic diagram of another light emitting device provided by 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 DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work 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 and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0035] As mentioned in the background technology, the OLED light-emitting device has more and more light-emitting areas, and the light-emitting uniformity cannot meet the requirements. The inventors have found 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 and light up at the same time. Since the areas of the light-emitting areas connected to the same external pin are different, the current densities of different light-emitting areas are different, resulting in inconsistent light brightness, which affects the light uniformity of the light-emitting device.

[0036] An embodiment of the present invention provides a light emitting device, Figure 1 is a schematic diagram of a light emitting device provided by an embodiment of the present invention, Figure 2 is a schematic diagram of another light emitting device provided by an embodiment of the present invention, referring to Figure 1 and Figure 2 , the light emitting device comprises:

[0037] A 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 through a lead 30, and the leads 30 of the sub-light-emitting units 101 in the same first light-emitting unit 10 are 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 at least two sub-light emitting units 101 of the same first light emitting unit 10 include a first sub-light emitting unit 11 and at least one second sub-light emitting unit 12, the first sub-light emitting unit 11 and the second sub-light emitting unit 12 have different light emitting areas, and 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 may be a flexible substrate or a rigid substrate. The material of the substrate 100 may be glass or polyimide. The first light-emitting unit 10 may include two or more sub-light-emitting units 101, and the two or more sub-light-emitting units 101 are connected to the same external pin 40 through their respective leads 30. When the external pin 40 receives a driving signal, it is transmitted to each sub-light-emitting unit 101 through the lead 30. The two or more sub-light-emitting units 101 connected to the same external pin 40 light up and emit light at the same time. Figure 2 FIG. 4 shows a case where a first light emitting unit 10 includes two sub-light emitting units 101. Figure 3 , a case where a first light-emitting unit 10 includes three sub-light-emitting units 101 is shown. The light-emitting areas of at least some of the at least two sub-light-emitting units 101 included in the first light-emitting unit 10 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 101 included in the first light-emitting unit 10. The number of the first sub-light-emitting units 11 may be one or more. The second sub-light-emitting unit 12 is the other sub-light-emitting unit 101 with a light-emitting area greater than the light-emitting area of ​​the first sub-light-emitting unit 11 among the at least two sub-light-emitting units 101 included in the first light-emitting unit 10. The number of the second sub-light-emitting units 12 may be one or more. Exemplarily, the first light-emitting unit 10 includes three sub-light-emitting units 101, one of which has a smaller light-emitting area, and the other two sub-light-emitting units 101 have a larger light-emitting area. Then, the first light-emitting unit 10 includes 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 30, and the cathode of each first light-emitting unit 10 is a whole-layer structure, or the cathode of each sub-light-emitting unit 101 is electrically connected to the lead 30, and the anode of each first light-emitting unit 10 is a whole-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, each sub-light-emitting unit 101 performs current shunting after the external pin 40 transmits the driving signal. When the light-emitting areas of each sub-light-emitting unit 101 are different, the equivalent resistances of different sub-light-emitting units 101 are different, and when the impedance of the lead 30 and the sub-light-emitting unit 101 does not match, the current density of each sub-light-emitting unit 101 differs greatly, and the light-emitting brightness differs 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, and the resistance R of the lead 30 of the second sub-light emitting unit 12 is determined in combination with 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. 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, so 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 area S1 of the first sub-light emitting unit 11 and the light-emitting area S of the second sub-light emitting unit 12, respectively, so that when the external pin 40 transmits the driving signal, the current density of the first sub-light emitting unit 11 and the second sub-light emitting unit 12 are the same or similar, so that the light-emitting brightness of the first sub-light emitting unit 11 and the second sub-light emitting unit 12 are the same or similar, and the light-emitting uniformity of the light-emitting device is improved.

[0045] Based on the above embodiment, optionally, when the ratio of R1 to the equivalent resistance of the first sub-light-emitting unit 11 is in a different first ratio range, the ratio of R1 / R to S / S1 is in a different second ratio range; 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 in a different first ratio range, the first sub-light-emitting unit 11 has different shunts and current densities, and the second sub-light-emitting unit 12 needs to be provided with different lead resistances, so that the current densities of the second sub-light-emitting unit 12 and the first light-emitting unit 11 are similar or the same. When the ratio of R1 to the equivalent resistance of the first sub-light-emitting unit 11 is set in a different first ratio range, the ratio of R1 / R to S / S1 is in a different second ratio range, so that the current densities of the second sub-light-emitting unit 12 and the first sub-light-emitting unit 11 are similar or the same, and the luminous brightness of the second sub-light-emitting unit 12 and the first sub-light-emitting unit 11 are the same.

[0047] On the basis of the above embodiment, 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 1%, 0.8*S / S1≤R1 / R≤1.5*S / S1.

[0050] The inventor verified the above lead resistance through simulation experiments. Table 1 shows 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 and 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 and the brightness data.

[0051] Table 1

[0052]

[0053] Table 2

[0054]

[0055] Referring to Table 1 and Table 2, when R1 is less than 1‰ of the equivalent resistance of the first light-emitting unit, set R1 / R≥0.1*S / S1, that is, R1 / R≥1.6. For example, when R1 / R=6, the luminous brightness ratio of the first sub-light-emitting unit and 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 luminous brightness ratio of the first sub-light-emitting unit and the second sub-light-emitting unit is 1.12. It can be seen that 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 0.1*S / S1, the brightness of the first sub-light-emitting unit and the second sub-light-emitting unit tend to be consistent, and the light-emitting uniformity of the light-emitting device is better.

[0057] When the ratio of R1 to the equivalent resistance is within 1‰-1%, 0.5*S / S1≤R1 / R≤5*S / S1 is set, that is, 8≤R1 / R≤80. For example, when R1 / R=10, the luminous brightness ratio of the first sub-light-emitting unit and the second sub-light-emitting unit is 1.02, and when R1 / R=50, the luminous brightness ratio of the first sub-light-emitting unit and the second sub-light-emitting unit is 1.01. When R1 / R is not within the above range, for example, when R1 / R=5, the luminous brightness ratio of the first sub-light-emitting unit and the second sub-light-emitting unit is 1.05. It can be seen that 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 0.5*S / S1≤R1 / R≤5*S / S1, the brightness of the first sub-light-emitting unit and the second sub-light-emitting unit 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, 0.8*S / S1≤R1 / R≤1.5*S / S1, that is, 12.8≤R1 / R≤24, illustratively, R1 / R=17.64705882, and the luminous brightness ratio of the first sub-light-emitting unit and the second sub-light-emitting unit is 1.004. R1 / R is not within the above range, such as, when R1 / R=10, the luminous brightness ratio of the first sub-light-emitting unit and the second sub-light-emitting unit is 1.07, and when R1 / R=37.5, the luminous brightness ratio of the first sub-light-emitting unit and the second sub-light-emitting unit is 1.06. It can be seen that the ratio of R1 to the equivalent resistance of the first sub-light-emitting unit is greater than one percent, and when 0.8*S / S1≤R1 / R≤1.5*S / S1, the brightness of the first sub-light-emitting unit and the second sub-light-emitting unit tends to be consistent, and the luminous uniformity of the light-emitting device is better.

[0059] Based on the above embodiment, optionally, at least one of 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 is different in width, length and thickness.

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

[0061] On the basis of the above embodiment, optionally, at least two sub-light emitting units 101 in the same first light emitting unit 10 have the same light emitting color.

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

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

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

[0065] The second light emitting unit 20 is electrically connected to the external pin 40 through the lead 30, and the external pin 40 connected to the second light emitting unit 20 is different from that to the first light emitting unit 40;

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

[0067] Specifically, each sub-light emitting unit 101 is directly electrically connected to the external pin 40 through the lead 30. The second light emitting unit 20 may include one sub-light emitting unit 101, or 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 as a whole 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 is a schematic diagram of another light emitting device provided by an embodiment of the present invention, referring to Figure 3 On the basis of the above embodiment, optionally, a grid-shaped signal transmission line 60 is further provided on the substrate 100, the sub-light-emitting unit 101 is arranged in the grid of the grid-shaped signal transmission line 60, different sub-light-emitting units 101 are arranged in different grids, and the lead 30 is electrically connected to the external pin 40 through the grid-shaped signal transmission line 60.

[0069] Specifically, the lead wire 30 is disposed in the grid together with the sub-light emitting unit 101, 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 a signal transmission line 60, and different first light emitting units 10 correspond to different signal transmission lines 60.

[0070] Figure 4 is a schematic diagram of another light emitting device provided by an embodiment of the present invention, referring to Figure 4, based on the above embodiment, optionally, the light emitting device further includes:

[0071] The driving circuit board 50 is bound and connected to the external pins 40 , and the driving circuit board 50 is used to send a driving signal to the external pins 40 .

[0072] Specifically, multiple external pins 40 are located in the border area of ​​the light-emitting device, and 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 The cross-sectional view of the light emitting device along the section line AA, refer to Figure 5 and Figure 4 On the basis of the above embodiment, optionally, the sub-light-emitting unit 101 includes a first electrode 51, a light-emitting functional layer 52 and a second electrode 53 which are stacked in sequence, the second electrode 53 is arranged on a 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 a lead 30.

[0074] The first electrode 51 is an anode and the second electrode 53 is a cathode, or the first electrode 51 is a cathode and the second electrode 53 is an anode. The first light emitting unit 10 and the second electrode 53 of the second light emitting unit 20 may be an integral structure.

[0075] Based on the above embodiment, optionally, the light-emitting functional layer 52 includes a first functional layer, an organic light-emitting layer, and a second functional layer stacked in sequence; the first functional layer is disposed on a 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] Wherein, when the first electrode 51 is a cathode and the second electrode 53 is an 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. When the first electrode 51 is an anode and the second electrode 53 is a cathode, 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.

[0079] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0080] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present 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 is electrically connected to an external pin through a lead, the leads of the sub-light-emitting units in the same first light-emitting unit are connected to the same external pin, and the external pin is used to transmit a driving signal to the first light-emitting unit; The at least two sub-light emitting units of the same first light emitting unit include a first sub-light emitting unit and at least one second sub-light emitting unit, the first sub-light emitting unit and the second sub-light emitting unit have different light emitting areas, and the first sub-light emitting unit is a 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 connected to the first sub-light emitting unit is R1, and the resistance of the lead 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, the ratio of R1 / R to S / S1 is different.

2. The light emitting device according to claim 1, characterized in that: 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.

3. The light emitting device according to claim 2, characterized in that: 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; 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; When the ratio of R1 to the equivalent resistance of the first sub-light emitting unit is greater than 1%, 0.8*S / S1≤R1 / R≤1.5*S / S1.

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

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

6. The light emitting device according to claim 1, characterized in that: Also includes: A second light-emitting unit disposed on the substrate, wherein 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, and the second light emitting unit is connected to a different external pin than the first light emitting unit; The lead wire directly extends to the location of the external pin and is electrically connected to the external pin.

7. The light emitting device according to claim 1, characterized in that: A grid-shaped signal transmission line is also provided on the substrate, the sub-light-emitting units are arranged in the grid of the grid-shaped signal transmission line, different sub-light-emitting units are arranged in different grids, and the leads are electrically connected to the external pins through the grid-shaped signal transmission line.

8. The light emitting device according to claim 1, characterized in that: Also includes: A driving circuit board is bound and connected to the external pins, and is used to send a driving signal to the external pins.

9. 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 which are stacked in sequence. The second electrode is arranged on a side of the light-emitting functional layer away from the substrate. The first electrode is electrically connected to the external pin through the lead wire.

10. The light emitting device according to claim 9, characterized in that: The light-emitting functional layer comprises a first functional layer, an organic light-emitting layer and a second functional layer which are stacked in sequence; the first functional layer is arranged on a 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, and 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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