Light source and method of operating a light source
By designing a light source structure with specific current direction and electrode material combination, the problems of fixed color temperature and uneven brightness in existing lighting products have been solved, achieving high brightness uniformity and flexible light source control.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- BOE TECHNOLOGY GROUP CO LTD
- Filing Date
- 2024-11-01
- Publication Date
- 2026-07-14
Smart Images
Figure CN122397348A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to display technology, and more specifically, to a light source and a method of operating the light source. Background Technology
[0002] Display technology has advanced significantly in recent years thanks to advancements in materials and designs that enable more efficient and versatile light-emitting devices. Organic light-emitting diodes (OLEDs) are increasingly being used in a variety of applications, including lighting and display panels, due to their ability to provide high-quality light with enhanced color rendering and energy efficiency. Summary of the Invention
[0003] In one aspect, this disclosure provides a light source comprising: a first electrode layer; a first light-emitting layer located on the first electrode layer; a second electrode layer located on a side of the first light-emitting layer away from the first electrode layer; a second light-emitting layer located on a side of the second electrode layer away from the first light-emitting layer; and a third electrode layer located on a side of the second light-emitting layer away from the second electrode layer; wherein, when the current in the first light-emitting layer is greater than the current in the second light-emitting layer: the current in the first electrode layer flows from the periphery of the first electrode layer to the center; the current in the second electrode layer flows from the center of the second electrode layer to the periphery; and the current in the third electrode layer flows from the center of the third electrode layer to the periphery; wherein, when the current in the second light-emitting layer is greater than the current in the first light-emitting layer: the current in the first electrode layer flows from the periphery of the first electrode layer to the center; the current in the second electrode layer flows from the periphery of the second electrode layer to the center; and the current in the third electrode layer flows from the center of the third electrode layer to the periphery.
[0004] Optionally, the current in the first light-emitting layer is along the direction from the first electrode layer to the third electrode layer; and the current in the second light-emitting layer is along the direction from the first electrode layer to the third electrode layer.
[0005] Optionally, the first electrode layer comprises a metal oxide material, the second electrode layer comprises a metal oxide material, and the third electrode layer comprises a metal material.
[0006] Optionally, the light source further includes a junction region of the first electrode layer, the second electrode layer, and the third electrode layer, the junction region being located in the peripheral region of the light source; wherein, the first junction region of the first electrode layer is located on a first side and a second side of the light source respectively; the second junction region of the second electrode layer is located on a third side and a fourth side of the light source respectively; the third junction region of the third electrode layer is located on a first side and a second side of the light source respectively; the first side and the second side are opposite to each other; the third side and the fourth side are opposite to each other; the third side connects the first side and the second side; and the fourth side connects the first side and the second side.
[0007] Optionally, on the first side, the light source includes at least one of the first bonding regions and at least two of the third bonding regions; the at least one of the first bonding regions spaced apart from the at least two of the third bonding regions; on the first side, one of the third bonding regions, one of the first bonding regions, and one of the third bonding regions are arranged sequentially; on the second side, the light source includes at least one of the first bonding regions and at least two of the third bonding regions; the at least one of the first bonding regions spaced apart from the at least two of the third bonding regions; and on the second side, one of the third bonding regions, one of the first bonding regions, and one of the third bonding regions are arranged sequentially.
[0008] Optionally, at least one of the first electrode layer, the second electrode layer, and the third electrode layer is an electrode layer of metal oxide material; and at least another of the first electrode layer, the second electrode layer, and the third electrode layer is an electrode layer of metal material; wherein, along the periphery of the light source, the length of one or more bonding regions of the metal material is less than the length of one or more bonding regions of the metal oxide material.
[0009] Optionally, when the current in the first light-emitting layer is greater than the current in the second light-emitting layer: the voltage difference between the first electrode layer and the second electrode layer is minimal in the central region of the first light-emitting layer, and the voltage drop in the region is also minimal.
[0010] Optionally, when the current in the first light-emitting layer is greater than the current in the second light-emitting layer: the difference between the maximum voltage drop and the minimum voltage drop across the first light-emitting layer is equal to the IR drop from the first junction region of the first electrode layer to the center region of the first electrode layer plus the IR drop from the second junction region of the second electrode layer to the center region of the second electrode layer.
[0011] Optionally, when the current in the first light-emitting layer is greater than the current in the second light-emitting layer: when the second light-emitting layer is configured to emit light, one or more regions of the second light-emitting layer closest to the second bonding region are the brightest regions of the second light-emitting layer; in one or more regions of the second light-emitting layer closest to the second bonding region, the voltage difference between the second electrode layer and the third electrode layer is the largest; when the second light-emitting layer is configured to emit light, one or more regions of the second light-emitting layer furthest from the second bonding region are the darkest regions of the second light-emitting layer; and in one or more regions of the second light-emitting layer furthest from the second bonding region, the voltage difference between the second electrode layer and the third electrode layer is the smallest.
[0012] Optionally, when the current in the first light-emitting layer is greater than the current in the second light-emitting layer: the difference between the maximum voltage drop and the minimum voltage drop across the second light-emitting layer is equal to the IR drop from the second junction region of the second electrode layer to the center region of the second electrode layer plus the IR drop from the third junction region of the third electrode layer to the center region of the third electrode layer.
[0013] Optionally, when the current in the second light-emitting layer is greater than the current in the first light-emitting layer, and the difference between the IR drop from the first junction region of the first electrode layer to the center region of the first electrode layer and the IR drop from the second junction region of the second electrode layer to the center region of the second electrode layer is positive: when the first light-emitting layer is configured to emit light, the center region of the first light-emitting layer is the darkest region of the first light-emitting layer; and in the center region of the first light-emitting layer, the voltage difference between the first electrode layer and the second electrode layer is minimal, and the voltage drop in the center region is also minimal.
[0014] Optionally, when the current in the second light-emitting layer is greater than the current in the first light-emitting layer, and the difference between the IR drop from the first junction region of the first electrode layer to the center region of the first electrode layer and the IR drop from the second junction region of the second electrode layer to the center region of the second electrode layer is negative: when the first light-emitting layer is configured to emit light, the center region of the first light-emitting layer is the brightest region of the first light-emitting layer; and in the center region of the first light-emitting layer, the voltage difference between the first electrode layer and the second electrode layer is the largest, and the voltage drop in the region is also the largest.
[0015] Optionally, when the current in the second light-emitting layer is greater than the current in the first light-emitting layer: when the second light-emitting layer is configured to emit light, the central region of the second light-emitting layer is the darkest region of the second light-emitting layer; and in the central region of the second light-emitting layer, the voltage difference between the second electrode layer and the third electrode layer is minimal.
[0016] Optionally, when the current in the second light-emitting layer is greater than the current in the first light-emitting layer: the difference between the maximum voltage drop and the minimum voltage drop across the second light-emitting layer is equal to the IR drop from the second junction region of the second electrode layer to the center region of the second electrode layer plus the IR drop from the third junction region of the third electrode layer to the center region of the third electrode layer.
[0017] Optionally, the light source further includes a junction region of the first electrode layer, the second electrode layer, and the third electrode layer, the junction region being located in the peripheral region of the light source; wherein, the first junction region of the first electrode layer is located on a first side and a second side of the light source respectively; the second junction region of the second electrode layer is located on a third side and a fourth side of the light source respectively; the third junction region of the third electrode layer is located on a fifth side and a sixth side of the light source respectively; the first side and the second side are opposite to each other; the third side and the fourth side are opposite to each other; the fifth side and the sixth side are opposite to each other; the fourth side connects the first side and the sixth side; the sixth side connects the fourth side and the second side; the second side connects the sixth side and the third side; the third side connects the second side and the fifth side; and the fifth side connects the third side and the first side.
[0018] Optionally, on the first side, the light source includes at least one of the first bonding regions; on the second side, the light source includes at least one of the first bonding regions; on the third side, the light source includes at least one of the second bonding regions; on the fourth side, the light source includes at least one of the second bonding regions; on the fifth side, the light source includes at least one of the third bonding regions; and on the sixth side, the light source includes at least one of the third bonding regions.
[0019] Optionally, the maximum voltage drop of the first electrode layer is K1X; the maximum voltage drop of the third electrode layer is K2Y; the maximum voltage drop of the second electrode layer is |K3X-K4Y|; K1 is a proportionality constant associated with the first electrode layer; K2 is a proportionality constant associated with the third electrode layer; K3 and K4 are proportionality constants associated with the second electrode layer; X represents the brightness of the first light-emitting layer; and Y represents the brightness of the second light-emitting layer.
[0020] Optionally, when the current density of the first light-emitting layer is greater than the current density of the second light-emitting layer: the voltage difference between the brightest and darkest regions of the first light-emitting layer is K1X+|K3X-K4Y|; and the voltage difference between the brightest and darkest regions of the second light-emitting layer is |K3X-K4Y|+K2Y.
[0021] Optionally, when the current density of the second light-emitting layer is greater than the current density of the first light-emitting layer: the voltage difference between the brightest and darkest regions of the first light-emitting layer is K1X-|K3X-K4Y|; and the voltage difference between the brightest and darkest regions of the second light-emitting layer is |K3X-K4Y|+K2Y.
[0022] In another aspect, this disclosure provides a method for operating a light source; wherein the light source includes: a first electrode layer; a first light-emitting layer located on the first electrode layer; a second electrode layer located on a side of the first light-emitting layer away from the first electrode layer; a second light-emitting layer located on a side of the second electrode layer away from the first light-emitting layer; and a third electrode layer located on a side of the second light-emitting layer away from the second electrode layer; wherein the method includes operating the light source in a first mode; wherein, in the first mode, the first light-emitting layer is configured to emit light, and the second light-emitting layer is configured not to emit light; the difference between a maximum voltage drop and a minimum voltage drop across the first light-emitting layer is less than a first threshold; the difference between the maximum voltage drop and the minimum voltage drop across the first light-emitting layer is equal to the IR drop from a first junction region of the first electrode layer to a central region of the first electrode layer plus the IR drop from a second junction region of the second electrode layer to a central region of the second electrode layer; and the first threshold is a value when the brightness uniformity of the light source is greater than 95%.
[0023] Optionally, the method further includes operating the light source in a second mode; wherein, in the second mode, the second light-emitting layer is configured to emit light, and the first light-emitting layer is configured not to emit light; the difference between the maximum and minimum voltage drops across the second light-emitting layer is less than a second threshold; the difference between the maximum and minimum voltage drops across the second light-emitting layer is equal to the IR drop from the second junction region of the second electrode layer to the central region of the second electrode layer plus the IR drop from the third junction region of the third electrode layer to the central region of the third electrode layer; and the second threshold is a value when the brightness uniformity of the light source is greater than 95%.
[0024] Optionally, the method further includes operating the light source in a third mode; wherein, in the third mode, the second light-emitting layer is configured to emit light at a fixed brightness level, and the first light-emitting layer is configured to emit light within a continuously adjustable range between 0 and a maximum brightness value.
[0025] Optionally, the method further includes operating the light source in a fourth mode; wherein, in the fourth mode, the first light-emitting layer is configured to emit light at a first fixed brightness level, and the second light-emitting layer is configured to emit light at a second fixed brightness level, thereby fixing the total brightness of the light source. Attached Figure Description
[0026] The following figures are merely illustrative examples based on various disclosed embodiments and are not intended to limit the scope of the invention.
[0027] Figure 1 This is a schematic diagram illustrating the structure of a light source according to some embodiments of the present disclosure.
[0028] Figure 2 This is a schematic diagram illustrating the current in a light source according to some embodiments of the present disclosure.
[0029] Figure 3 This is a schematic diagram illustrating the current in a light source according to some embodiments of the present disclosure.
[0030] Figure 4 This is a schematic diagram showing the junction region of the first electrode layer, the second electrode layer, and the third electrode layer in a light source according to some embodiments of the present disclosure.
[0031] Figure 5 This is a schematic diagram illustrating the current in a light source according to some embodiments of the present disclosure.
[0032] Figure 6 This is a schematic diagram illustrating the current in a light source according to some embodiments of the present disclosure.
[0033] Figure 7 This is a schematic diagram illustrating the current in a light source according to some embodiments of the present disclosure.
[0034] Figure 8 This is a schematic diagram illustrating the current in a light source according to some embodiments of the present disclosure.
[0035] Figure 9 This is a schematic diagram illustrating the current in a light source according to some embodiments of the present disclosure.
[0036] Figure 10 This is a schematic diagram illustrating the current in a light source according to some embodiments of the present disclosure. Detailed Implementation
[0037] This disclosure will now be described in more detail with reference to the following embodiments. It should be noted that the following description of some embodiments presented herein is for illustrative and descriptive purposes only. It is not exhaustive or limited to the precise forms disclosed.
[0038] Existing lighting products typically have a fixed color temperature or allow adjustment between several preset color temperatures.
[0039] This disclosure provides, in particular, a light source and a method of operating the light source, which substantially avoids one or more problems caused by the limitations and disadvantages of the prior art. In one aspect, this disclosure provides a light source. In some embodiments, the light source includes: a first electrode layer; a first light-emitting layer located on the first electrode layer; a second electrode layer located on a side of the first light-emitting layer away from the first electrode layer; a second light-emitting layer located on a side of the second electrode layer away from the first light-emitting layer; and a third electrode layer located on a side of the second light-emitting layer away from the second electrode layer. Optionally, when the current in the first light-emitting layer is greater than the current in the second light-emitting layer: the current in the first electrode layer flows from the periphery to the center of the first electrode layer; the current in the second electrode layer flows from the center to the periphery of the second electrode layer; and the current in the third electrode layer flows from the center to the periphery of the third electrode layer; the current in the first light-emitting layer flows from the first electrode layer to the third electrode layer; and the current in the second light-emitting layer flows from the first electrode layer to the third electrode layer.
[0040] Figure 1 This is a schematic diagram illustrating the structure of a light source according to some embodiments of the present disclosure. (Reference) Figure 1 In some embodiments, the light source includes a first electrode layer E1, a first light-emitting layer EL1 located on the first electrode layer E1, a second electrode layer E2 located on the side of the first light-emitting layer EL1 away from the first electrode layer E1, a second light-emitting layer EL2 located on the side of the second electrode layer E2 away from the first light-emitting layer EL1, and a third electrode layer E3 located on the side of the second light-emitting layer EL2 away from the second electrode layer E2.
[0041] Various suitable conductive materials can be used to fabricate the first electrode layer E1. Examples of suitable conductive materials for fabricating the first electrode layer E1 include oxide materials such as indium tin oxide, indium zinc oxide, indium gallium oxide, and indium gallium zinc oxide. In one example, the first electrode layer E1 comprises indium tin oxide. Optionally, the first electrode layer E1 is a transparent electrode layer.
[0042] Various suitable conductive materials can be used to fabricate the second electrode layer E2. Examples of suitable conductive materials for fabricating the second electrode layer E2 include oxide materials, such as indium tin oxide, indium zinc oxide, indium gallium oxide, and indium gallium zinc oxide. In one example, the second electrode layer E2 comprises indium zinc oxide. Examples of suitable conductive materials for fabricating the second electrode layer E2 also include metallic materials, such as copper, aluminum, silver, molybdenum, chromium, neodymium, nickel, manganese, titanium, tantalum, and tungsten. In another example, the second electrode layer E2 comprises a magnesium-silver alloy or a laminated material. Optionally, the second electrode layer E2 is a transparent electrode layer.
[0043] Various suitable conductive materials can be used to fabricate the third electrode layer E3. Examples of suitable conductive materials for fabricating the third electrode layer E3 include metallic materials such as copper, aluminum, silver, molybdenum, chromium, neodymium, nickel, manganese, titanium, tantalum, and tungsten. In one example, the third electrode layer E3 comprises aluminum. Alternatively, the third electrode layer E3 is a transparent electrode layer.
[0044] In one example, the first electrode layer E1 comprises indium tin oxide, the second electrode layer E2 comprises a magnesium-silver alloy or laminate, and the third electrode layer E3 comprises aluminum. The inventors of this disclosure have found that this structure facilitates achieving relatively low IR drops at both ends of the light source.
[0045] In some embodiments, the first electrode layer E1 comprises a metal oxide material, the second electrode layer E2 comprises a metal oxide material, and the third electrode layer E3 comprises a metal material.
[0046] In some embodiments, at least one of the first electrode layer E1, the second electrode layer E2, and the third electrode layer E3 is an electrode layer made of metal oxide material. In some embodiments, at least another of the first electrode layer E1, the second electrode layer E2, and the third electrode layer E3 is an electrode layer made of metal material. In some embodiments, along the periphery of the light source, the length of one or more bonding regions of the metal material is less than the length of one or more bonding regions of the metal oxide material.
[0047] In some embodiments, when a first voltage signal is applied to the first electrode layer E1, a second voltage signal is applied to the second electrode layer E2, and a third voltage signal is applied to the third electrode layer E3, the first light-emitting layer EL1 and the second light-emitting layer EL2 are configured to emit light simultaneously. In some embodiments, the voltage level of the first voltage signal is higher than the voltage level of the second voltage signal, and the voltage level of the second voltage signal is higher than the voltage level of the third voltage signal. In one example, the voltage level of the first voltage signal is 8V, the voltage level of the second voltage signal is 4V, and the voltage level of the third voltage signal is 0V.
[0048] In the light source according to some embodiments of the present disclosure, the current in the first light-emitting layer EL1 may be different from or the same as the current in the second light-emitting layer EL2. When the current in the first light-emitting layer EL1 is different from the current in the second light-emitting layer EL2, the current in the first light-emitting layer EL1 may be greater than the current in the second light-emitting layer EL2, or the current in the second light-emitting layer EL2 may be greater than the current in the first light-emitting layer EL1.
[0049] Figure 2 This is a schematic diagram illustrating the current in a light source according to some embodiments of the present disclosure. Figure 2The diagram illustrates the current in the light source when the first light-emitting layer EL1 and the second light-emitting layer EL2 are configured to emit light simultaneously, with the current in the first light-emitting layer EL1 being greater than the current in the second light-emitting layer EL2. See also... Figure 2 The current in the first electrode layer E1 flows from the periphery to the center of the first electrode layer E1 (denoted as the first direction DR1). The current in the second electrode layer E2 flows from the center to the periphery of the second electrode layer E2 (denoted as the second direction DR2). The current in the third electrode layer E3 flows from the center to the periphery of the third electrode layer E3 (denoted as the second direction DR2). The current in the first light-emitting layer EL1 flows from the first electrode layer E1 to the third electrode layer E3 (denoted as the third direction DR3). The current in the second light-emitting layer EL2 flows from the first electrode layer E1 to the third electrode layer E3 (denoted as the third direction DR3).
[0050] Figure 3 This is a schematic diagram illustrating the current in a light source according to some embodiments of the present disclosure. Figure 3 The diagram illustrates the current in the light source when the first light-emitting layer EL1 and the second light-emitting layer EL2 are configured to emit light simultaneously, and the current in the second light-emitting layer EL2 is greater than the current in the first light-emitting layer EL1. See also... Figure 3 The current in the first electrode layer E1 flows from the periphery to the center of the first electrode layer E1 (denoted as the first direction DR1). The current in the second electrode layer E2 flows from the periphery to the center of the second electrode layer E2 (denoted as the second direction DR2). The current in the third electrode layer E3 flows from the center to the periphery of the third electrode layer E3 (denoted as the second direction DR2). The current in the first light-emitting layer EL1 flows from the first electrode layer E1 to the third electrode layer E3 (denoted as the third direction DR3). The current in the second light-emitting layer EL2 flows from the first electrode layer E1 to the third electrode layer E3 (denoted as the third direction DR3).
[0051] Figure 4 This is a schematic diagram illustrating the junction region of the first electrode layer, the second electrode layer, and the third electrode layer in a light source according to some embodiments of the present disclosure. (Refer to...) Figure 4The bonding regions of the first electrode layer, the second electrode layer, and the third electrode layer are located in the peripheral region of the light source. In some embodiments, the first bonding region BR1 of the first electrode layer is located on the first side S1 and the second side S2 of the light source, respectively. In some embodiments, the second bonding region BR2 of the second electrode layer is located on the third side S3 and the fourth side S4 of the light source, respectively. In some embodiments, the third bonding region BR3 of the third electrode layer is located on the first side S1 and the second side S2 of the light source, respectively. The first side S1 and the second side S2 are opposite to each other, the third side S3 and the fourth side S4 are opposite to each other, the third side S3 connects the first side S1 and the second side S2, and the fourth side S4 connects the first side S1 and the second side S2.
[0052] In some embodiments, on the first side S1, the light source includes at least one of the first bonding regions BR1 and at least two of the third bonding regions BR3, wherein at least one of the first bonding regions BR1 spacees apart the at least two of the third bonding regions BR3. Optionally, on the first side S1, one of the third bonding regions BR3, one of the first bonding regions BR1, and one of the third bonding regions BR3 are arranged sequentially.
[0053] In some embodiments, on the second side S2, the light source includes at least one of the first bonding regions BR1 and at least two of the third bonding regions BR3, wherein at least one of the first bonding regions BR1 spacees apart the at least two of the third bonding regions BR3. Optionally, on the second side S2, one of the third bonding regions BR3, one of the first bonding regions BR1, and one of the third bonding regions BR3 are arranged sequentially.
[0054] Figure 5 This is a schematic diagram illustrating the current in a light source according to some embodiments of the present disclosure. Figure 5 The diagram illustrates the current in the light source when the first light-emitting layer EL1 and the second light-emitting layer EL2 are configured to emit light simultaneously, with the current in the first light-emitting layer EL1 being greater than the current in the second light-emitting layer EL2. See also... Figure 2 and Figure 5 The current in the first electrode layer E1 flows along a first direction DR1 from the periphery to the center of the first electrode layer E1, and between the junction regions located on the first side S1 and the second side S2, respectively. The current in the second electrode layer E2 flows along a second direction DR2 from the center to the periphery of the second electrode layer E2, and between the junction regions located on the first side S1 and the second side S2, respectively. The current in the third electrode layer E3 flows along a third direction DR3 from the center to the periphery of the third electrode layer E3, and between the junction regions located on the third side S3 and the fourth side S4, respectively.
[0055] Reference Figure 2 and Figure 5When the current in the first light-emitting layer EL1 is greater than the current in the second light-emitting layer EL2, only a portion of the current in the first light-emitting layer EL1 flows to the second light-emitting layer, while the other portion of the current in the first light-emitting layer EL1 flows to the second electrode layer E2. When the first light-emitting layer EL1 is configured to emit light, the central region of the first light-emitting layer EL1 (in...) Figure 5 The region denoted as A1 is the darkest area of the first light-emitting layer EL1. In the central region of the first light-emitting layer EL1, the voltage difference between the first electrode layer E1 and the second electrode layer E2 is minimal, and the voltage drop in this region is also minimal. The difference between the maximum and minimum voltage drops across the first light-emitting layer EL1 is equal to the IR drop from the first junction region BR1 of the first electrode layer E1 to the central region plus the IR drop from the second junction region BR2 of the second electrode layer E2 to the central region.
[0056] In some embodiments, when the current in the first light-emitting layer EL1 is greater than the current in the second light-emitting layer EL2, and when the second light-emitting layer EL2 is configured to emit light, one or more regions of the second light-emitting layer EL2 closest to the second bonding region BR2 ( Figure 5 The region denoted as A2 is the brightest area of the second luminescent layer EL2. One or more regions of the second luminescent layer EL2 closest to the second bonding region BR2 (in...) Figure 5 In the diagram (represented as A2), the voltage difference between the second electrode layer E2 and the third electrode layer E3 is the largest. When the second light-emitting layer EL2 is configured to emit light, the second light-emitting layer EL2 is located in one or more regions furthest from the second bonding region BR2 (in...). Figure 5 The region denoted as A3 is the darkest area of the second luminescent layer EL2. One or more regions of the second luminescent layer EL2 furthest from the second bonding region BR2 (in...) Figure 5 In the diagram (represented as A3), the voltage difference between the second electrode layer E2 and the third electrode layer E3 is the smallest. The difference between the maximum and minimum voltage drops across the second light-emitting layer EL2 is equal to the IR drop from the second junction region BR2 of the second electrode layer E2 to the central region plus the IR drop from the third junction region BR3 of the third electrode layer E3 to the central region.
[0057] Figure 6 This is a schematic diagram illustrating the current in a light source according to some embodiments of the present disclosure. Figure 6 The diagram illustrates the current in the light source when the first light-emitting layer EL1 and the second light-emitting layer EL2 are configured to emit light simultaneously, and the current in the second light-emitting layer EL2 is greater than the current in the first light-emitting layer EL1. See also... Figure 3 and Figure 6The current in the first electrode layer E1 flows along a first direction DR1 from the periphery to the center of the first electrode layer E1, and is located between the junction regions of the first side S1 and the second side S2, respectively. The current in the second electrode layer E2 flows along a second direction DR2 from the periphery to the center of the second electrode layer E2, and is located between the junction regions of the first side S1 and the second side S2, respectively. The current in the third electrode layer E3 flows along a third direction DR3 from the center to the periphery of the third electrode layer E3, and is located between the junction regions of the third side S3 and the fourth side S4, respectively.
[0058] Reference Figure 3 and Figure 6 When the current in the second light-emitting layer EL2 is greater than the current in the first light-emitting layer EL1, substantially all (e.g., at least 80%, at least 85%, at least 90%, at least 95%, at least 99%, or 100%) of the current in the first light-emitting layer EL1 flows to the second light-emitting layer and then to the third electrode layer E3.
[0059] In some embodiments, if the difference between the IR drop from the first bonding region BR1 of the first electrode layer E1 to the central region and the IR drop from the second bonding region BR2 of the second electrode layer E2 to the central region is positive, then when the first light-emitting layer EL is configured to emit light, the central region of the first light-emitting layer EL1 (in...) Figure 6 The region denoted as A1 is the darkest area of the first light-emitting layer EL1. In the central region of the first light-emitting layer EL1, the voltage difference between the first electrode layer E1 and the second electrode layer E2 is the smallest, and the voltage drop in this region is also the smallest.
[0060] In an alternative embodiment, if the difference between the IR drop from the first bonding region BR1 of the first electrode layer E1 to the central region and the IR drop from the second bonding region BR2 of the second electrode layer E2 to the central region is negative, then when the first light-emitting layer EL is configured to emit light, the central region of the first light-emitting layer EL1 (in...) Figure 6 The region denoted as A1 is the brightest area of the first light-emitting layer EL1. In the central region of the first light-emitting layer EL1, the voltage difference between the first electrode layer E1 and the second electrode layer E2 is the largest, and the voltage drop is also the largest in this region.
[0061] In some embodiments, when the current in the second light-emitting layer EL2 is greater than the current in the first light-emitting layer EL1, when the second light-emitting layer EL2 is configured to emit light, the central region of the second light-emitting layer EL2 ( Figure 6The region denoted as A1 is the darkest area of the second luminescent layer EL2. In the central region of the second luminescent layer EL2, the voltage difference between the second electrode layer E2 and the third electrode layer E3 is minimal. The difference between the maximum and minimum voltage drops across the second luminescent layer EL2 is equal to the IR drop from the second junction region BR2 of the second electrode layer E2 to the central region plus the IR drop from the third junction region BR3 of the third electrode layer E3 to the central region.
[0062] Figure 7 This is a schematic diagram illustrating the current in a light source according to some embodiments of the present disclosure. Figure 7 The diagram illustrates the current in the light source when the first light-emitting layer EL1 and the second light-emitting layer EL2 are configured to emit light simultaneously, and the current in the first light-emitting layer EL1 is greater than the current in the second light-emitting layer EL2. In some embodiments, the bonding regions of the first electrode layer, the second electrode layer, and the third electrode layer are located in the peripheral region of the light source. In some embodiments, the display panel has a hexagonal shape. In some embodiments, the first bonding region BR1 of the first electrode layer is located on the first side S1 and the second side S2 of the light source, respectively. In some embodiments, the second bonding region BR2 of the second electrode layer is located on the third side S3 and the fourth side S4 of the light source, respectively. In some embodiments, the third bonding region BR3 of the third electrode layer is located on the fifth side S5 and the sixth side S6 of the light source, respectively. The first side S1 and the second side S2 are opposite to each other, the third side S3 and the fourth side S4 are opposite to each other, and the fifth side S5 and the sixth side S6 are opposite to each other. The fourth side S4 connects to the first side S1 and the sixth side S6. The sixth side S6 connects to the fourth side S4 and the second side S2. The second side S2 connects to the sixth side S6 and the third side S3. The third side S3 connects to the second side S2 and the fifth side S5. The fifth side S5 connects to the third side S3 and the first side S1.
[0063] In some embodiments, on the first side S1, the light source includes at least one of the first bonding regions BR1. In some embodiments, on the second side S2, the light source includes at least one of the first bonding regions BR1. In some embodiments, on the third side S3, the light source includes at least one of the second bonding regions BR2. In some embodiments, on the fourth side S4, the light source includes at least one of the second bonding regions BR2. In some embodiments, on the fifth side S5, the light source includes at least one of the third bonding regions BR3. In some embodiments, on the sixth side S6, the light source includes at least one of the third bonding regions BR3.
[0064] See Figure 2 and Figure 7The current in the first electrode layer E1 flows along a first direction DR1 from the periphery to the center of the first electrode layer E1, and between the junction regions located on the first side S1 and the second side S2, respectively. The current in the second electrode layer E2 flows along a second direction DR2 from the center to the periphery of the second electrode layer E2, and between the junction regions located on the third side S3 and the fourth side S4, respectively. The current in the third electrode layer E3 flows along a third direction DR3 from the center to the periphery of the third electrode layer E3, and between the junction regions located on the fifth side S5 and the sixth side S6, respectively.
[0065] Figure 8 This is a schematic diagram illustrating the current in a light source according to some embodiments of the present disclosure. Figure 8 The diagram illustrates the current in the light source when the first light-emitting layer EL1 and the second light-emitting layer EL2 are configured to emit light simultaneously, and the current in the second light-emitting layer EL2 is greater than the current in the first light-emitting layer EL1. See also... Figure 3 and Figure 8 The current in the first electrode layer E1 flows along a first direction DR1 from the periphery to the center of the first electrode layer E1, and is located between the junction regions located on the first side S1 and the second side S2, respectively. The current in the second electrode layer E2 flows along a second direction DR2 from the periphery to the center of the second electrode layer E2, and is located between the junction regions located on the third side S3 and the fourth side S4, respectively. The current in the third electrode layer E3 flows along a third direction DR3 from the center to the periphery of the third electrode layer E3, and is located between the junction regions located on the fifth side S5 and the sixth side S6, respectively.
[0066] Figure 9 This is a schematic diagram illustrating the current in a light source according to some embodiments of the present disclosure. Figure 9The diagram illustrates the current in the light source when the first light-emitting layer EL1 and the second light-emitting layer EL2 are configured to emit light simultaneously, and the current in the first light-emitting layer EL1 is greater than the current in the second light-emitting layer EL2. In some embodiments, the bonding regions of the first electrode layer, the second electrode layer, and the third electrode layer are located in the peripheral region of the light source. In some embodiments, the display panel has a circular or elliptical shape. In some embodiments, the first bonding region BR1 of the first electrode layer is located on the first side S1 and the second side S2 of the light source, respectively. In some embodiments, the second bonding region BR2 of the second electrode layer is located on the third side S3 and the fourth side S4 of the light source, respectively. In some embodiments, the third bonding region BR3 of the third electrode layer is located on the fifth side S5 and the sixth side S6 of the light source, respectively. The first side S1 and the second side S2 are opposite to each other, the third side S3 and the fourth side S4 are opposite to each other, and the fifth side S5 and the sixth side S6 are opposite to each other. The fourth side S4 connects to the first side S1 and the sixth side S6. The sixth side S6 connects to the fourth side S4 and the second side S2. The second side S2 connects to the sixth side S6 and the third side S3. The third side S3 connects to the second side S2 and the fifth side S5. The fifth side S5 connects to the third side S3 and the first side S1.
[0067] In some embodiments, on the first side S1, the light source includes at least one of the first bonding regions BR1. In some embodiments, on the second side S2, the light source includes at least one of the first bonding regions BR1. In some embodiments, on the third side S3, the light source includes at least one of the second bonding regions BR2. In some embodiments, on the fourth side S4, the light source includes at least one of the second bonding regions BR2. In some embodiments, on the fifth side S5, the light source includes at least one of the third bonding regions BR3. In some embodiments, on the sixth side S6, the light source includes at least one of the third bonding regions BR3.
[0068] See Figure 2 and Figure 9 The current in the first electrode layer E1 flows along a first direction DR1 from the periphery to the center of the first electrode layer E1, and between the junction regions located on the first side S1 and the second side S2, respectively. The current in the second electrode layer E2 flows along a second direction DR2 from the center to the periphery of the second electrode layer E2, and between the junction regions located on the third side S3 and the fourth side S4, respectively. The current in the third electrode layer E3 flows along a third direction DR3 from the center to the periphery of the third electrode layer E3, and between the junction regions located on the fifth side S5 and the sixth side S6, respectively.
[0069] Figure 10 This is a schematic diagram illustrating the current in a light source according to some embodiments of the present disclosure. Figure 10The diagram illustrates the current in the light source when the first light-emitting layer EL1 and the second light-emitting layer EL2 are configured to emit light simultaneously, and the current in the second light-emitting layer EL2 is greater than the current in the first light-emitting layer EL1. See also... Figure 3 and Figure 10 The current in the first electrode layer E1 flows along a first direction DR1 from the periphery to the center of the first electrode layer E1, and is located between the junction regions located on the first side S1 and the second side S2, respectively. The current in the second electrode layer E2 flows along a second direction DR2 from the periphery to the center of the second electrode layer E2, and is located between the junction regions located on the third side S3 and the fourth side S4, respectively. The current in the third electrode layer E3 flows along a third direction DR3 from the center to the periphery of the third electrode layer E3, and is located between the junction regions located on the fifth side S5 and the sixth side S6, respectively.
[0070] The inventors of this disclosure have discovered that, in order to achieve a brightness uniformity of greater than 95% for the light source, the IR drop of the three electrode layers must be limited such that the difference between the maximum and minimum voltage drops across the first light-emitting layer EL1 and the second light-emitting layer EL2 is less than a certain value. This ensures that the brightness difference between the brightest and darkest areas of the first light-emitting layer EL1 and the second light-emitting layer EL2 allows for a brightness uniformity greater than 95%. The inventors of this disclosure have also discovered that the brightness of the first light-emitting layer EL1 and the second light-emitting layer EL2 must meet specific rules such that the IR drop caused by their current ensures a brightness uniformity greater than 95%.
[0071] In some embodiments, if the brightness of the first light-emitting layer EL1 is X and the brightness of the second light-emitting layer EL2 is Y, then the brightness is proportional to the current density, and the current density is proportional to the voltage drop. In some embodiments, the maximum voltage drop of the first electrode layer E1 is K1X, the maximum voltage drop of the third electrode layer E3 is K2Y, and the maximum voltage drop of the second electrode layer E2 is |K3X-K4Y|; where K1 is a proportionality constant associated with the first electrode layer E1; K2 is a proportionality constant associated with the third electrode layer E3, and K3 and K4 are proportionality constants associated with the second electrode layer E2.
[0072] In some embodiments, when the current density of the first light-emitting layer EL1 is greater than the current density of the second light-emitting layer EL2, the voltage difference between the brightest and darkest regions of the first light-emitting layer EL1 is K1X + |K3X - K4Y|, and the voltage difference between the brightest and darkest regions of the second light-emitting layer EL2 is |K3X - K4Y| + K2Y. The relationship between brightness uniformity and brightness is closely related to the positions of the brightest and darkest regions and the voltage drop.
[0073] In some embodiments, when the current density of the second light-emitting layer EL2 is greater than the current density of the first light-emitting layer EL1, the voltage difference between the brightest and darkest regions of the first light-emitting layer EL1 is K1X - |K3X - K4Y|, and the voltage difference between the brightest and darkest regions of the second light-emitting layer EL2 is |K3X - K4Y| + K2Y. The relationship between brightness uniformity and brightness is closely related to the positions of the brightest and darkest regions and the voltage drop.
[0074] In another aspect, this disclosure provides a method for driving a light source. In some embodiments, the method includes operating the light source in a first mode. In some embodiments, in the first mode, a first light-emitting layer EL1 is configured to emit light, and a second light-emitting layer EL2 is configured not to emit light. In some embodiments, the difference between the maximum and minimum voltage drop across the first light-emitting layer EL1 is less than a first threshold. In some embodiments, the difference between the maximum and minimum voltage drop across the first light-emitting layer EL1 is equal to the IR drop from the first bonding region BR1 of the first electrode layer E1 to the central region plus the IR drop from the second bonding region BR2 of the second electrode layer E2 to the central region. The first threshold is a value when the brightness uniformity of the light source is greater than 95%. As used herein, the term "brightness uniformity" refers to the consistency of the brightness level across an entire surface (e.g., a display or light source). It measures how uniformly light is distributed, with the goal of minimizing brightness variations between the brightest and darkest areas. In some embodiments, brightness uniformity is expressed as the ratio or percentage of the minimum brightness to the maximum brightness across the entire surface. High brightness uniformity (typically above 90% or 95%) indicates small differences between the brightest and darkest areas, resulting in a visually consistent and uniformly illuminated display or illuminated surface.
[0075] As brightness increases, the current in the first light-emitting layer EL1 increases, leading to a greater IR drop. Therefore, the first light-emitting layer EL1 has maximum brightness, and it can be continuously dimmed within the range from 0 to maximum brightness. Within this range, the first light-emitting layer EL1 will meet the requirement of brightness uniformity greater than 95%. In one example, the voltage values of the third electrode layer E3 and the second electrode layer E2 are fixed at 0V, and the voltage of the first electrode layer E1 can be continuously adjusted within a specific range (e.g., 0V to 4V) to achieve continuous dimming of the first light-emitting layer EL1 within a specific brightness range.
[0076] In some embodiments, the method includes operating the light source in a second mode. In some embodiments, in the second mode, the second light-emitting layer EL2 is configured to emit light, and the first light-emitting layer EL1 is configured not to emit light. In some embodiments, the difference between the maximum and minimum voltage drop across the second light-emitting layer EL2 is less than a second threshold. In some embodiments, the difference between the maximum and minimum voltage drop across the second light-emitting layer EL2 is equal to the IR drop from the second junction region BR2 of the second electrode layer E2 to the central region plus the IR drop from the third junction region BR3 of the third electrode layer E3 to the central region. The second threshold is a value when the brightness uniformity of the light source is greater than 95%.
[0077] As brightness increases, the current in the second emitting layer EL2 increases, leading to a greater IR drop. Therefore, the second emitting layer EL2 has maximum brightness, and it can be continuously dimmed within the range from 0 to maximum brightness. Within this range, the second emitting layer EL2 will meet the requirement of brightness uniformity greater than 95%. In one example, the voltage values of the first electrode layer E1 and the second electrode layer E2 are fixed at 4V, and the voltage of the third electrode layer E3 can be continuously adjusted within a specific range (e.g., 0V to 4V) to achieve continuous dimming of the second emitting layer EL2 within a specific brightness range.
[0078] In some embodiments, the method includes operating the light source in a third mode. In some embodiments, in the third mode, the second light-emitting layer EL2 is configured to emit light at a fixed brightness level (because the second light-emitting layer EL2 is a more efficient light-emitting layer), and the first light-emitting layer EL1 is configured to emit light within a continuously adjustable range between 0 and the maximum brightness value. In one example, the voltage of the second electrode layer E2 is fixed at 4V and the voltage of the third electrode layer E3 is fixed at 0V, and the voltage of the first electrode layer E1 can be continuously adjusted within a range (e.g., 4V to 8V) to achieve continuous dimming of the first light-emitting layer EL1 within a specific brightness range. In this case, the brightness and color temperature of the lighting device can be continuously adjusted within a certain range.
[0079] In some embodiments, the method includes operating the light source in a fourth mode. In some embodiments, in the fourth mode, a first light-emitting layer EL1 is configured to emit light at a first fixed brightness level, and a second light-emitting layer EL2 is configured to emit light at a second fixed brightness level, thereby fixing the total brightness of the light source.
[0080] When the efficiency of the second light-emitting layer EL2 is greater than that of the first light-emitting layer EL1, the brightness of the first light-emitting layer EL1 can be continuously adjusted between 0 and a first maximum brightness, and the brightness of the second light-emitting layer EL2 can be continuously adjusted between a second minimum brightness and the total brightness of the lighting device. In one example, the voltage of the third electrode layer E3 is fixed at 0V, and the voltage values of the first electrode layer E1 and the second electrode layer E2 can be continuously adjusted within a certain range (e.g., the first electrode layer E1 is in the range of 4V to 8V, and the second electrode layer E2 is in the range of 3V to 4V), and the voltages of the first electrode layer E1 and the second electrode layer E2 influence each other to ensure that the total brightness of the lighting device remains constant. This allows for continuous dimming of both the first light-emitting layer EL1 and the second light-emitting layer EL2 within a specific brightness range. In some embodiments, the total brightness of the light source is fixed, but the color temperature can be continuously adjusted within a specific range.
[0081] For illustrative and descriptive purposes, the foregoing description of embodiments of the invention has been provided. It is not exhaustive, nor is it intended to limit the invention to the precise forms or exemplary embodiments disclosed. Therefore, the foregoing description should be considered illustrative rather than restrictive. Clearly, many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to explain the principles of the invention and its best mode of practical application, thereby enabling those skilled in the art to understand the various embodiments of the invention and the various modifications suitable for the particular use or implementation contemplated. The scope of the invention is intended to be defined by the appended claims and their equivalents, wherein, unless otherwise stated, all terms are to be interpreted in their broadest reasonable sense. Therefore, the terms “the invention,” “the present invention,” etc., do not necessarily limit the scope of the claims to the specific embodiments, and references to exemplary embodiments of the invention do not imply limitation of the invention, nor should such limitation be inferred. The invention is defined only by the spirit and scope of the appended claims. Furthermore, these claims may involve the use of “first,” “second,” etc., followed by nouns or elements. These terms should be understood as nomenclature and should not be construed as limiting the number of elements modified by these nomenclatures unless a specific number has been given. Any advantages and benefits described may not apply to all embodiments of the invention. It should be understood that changes to the described embodiments can be made by those skilled in the art without departing from the scope of the invention as defined by the appended claims. Furthermore, the elements and components in this disclosure are not intended for public distribution, whether or not they are expressly recited in the appended claims.
Claims
1. A light source, comprising: First electrode layer; A first light-emitting layer is located on the first electrode layer; The second electrode layer is located on the side of the first light-emitting layer away from the first electrode layer; The second light-emitting layer is located on the side of the second electrode layer away from the first light-emitting layer; as well as The third electrode layer is located on the side of the second light-emitting layer away from the second electrode layer; Wherein, when the current in the first light-emitting layer is greater than the current in the second light-emitting layer: The current in the first electrode layer flows from the periphery of the first electrode layer to the center. The current in the second electrode layer flows from the center to the periphery of the second electrode layer; and The current in the third electrode layer flows from the center of the third electrode layer to the periphery. Wherein, when the current in the second light-emitting layer is greater than the current in the first light-emitting layer: The current in the first electrode layer flows from the periphery of the first electrode layer to the center. The current in the second electrode layer flows from the periphery to the center of the second electrode layer; and The current in the third electrode layer flows from the center of the third electrode layer to the periphery.
2. The light source according to claim 1, wherein, The current in the first light-emitting layer is along the direction from the first electrode layer to the third electrode layer; and The current in the second light-emitting layer is along the direction from the first electrode layer to the third electrode layer.
3. The light source according to claim 1, wherein, The first electrode layer comprises a metal oxide material, the second electrode layer comprises a metal oxide material, and the third electrode layer comprises a metal material.
4. The light source according to claim 1 further includes a bonding region of the first electrode layer, the second electrode layer, and the third electrode layer, wherein the bonding region is located in the peripheral region of the light source; in, The first bonding regions of the first electrode layer are located on the first side and the second side of the light source, respectively. The second bonding regions of the second electrode layer are located on the third and fourth sides of the light source, respectively; The third bonding region of the third electrode layer is located on the first side and the second side of the light source, respectively. The first side and the second side are opposite to each other; The third side and the fourth side are opposite to each other; The third side connects the first side and the second side; and The fourth side connects the first side and the second side.
5. The light source according to claim 4, wherein, On the first side, the light source includes at least one in the first junction region and at least two in the third junction region; The at least one in the first joining region separates the at least two in the third joining region; On the first side, one of the third joining regions, one of the first joining regions, and one of the third joining regions are arranged sequentially; On the second side, the light source includes at least one in the first bonding region and at least two in the third bonding region; The at least one in the first joining region separates the at least two in the third joining region; as well as On the second side, one of the third joining regions, one of the first joining regions, and one of the third joining regions are arranged sequentially.
6. The light source according to claim 4, wherein, At least one of the first electrode layer, the second electrode layer, and the third electrode layer is an electrode layer made of metal oxide material; and At least one of the first electrode layer, the second electrode layer, and the third electrode layer is an electrode layer made of metallic material; Wherein, along the periphery of the light source, the length of one or more bonding regions of the metallic material is less than the length of one or more bonding regions of the metallic oxide material.
7. The light source according to claim 1, wherein, When the current in the first light-emitting layer is greater than the current in the second light-emitting layer: In the central region of the first light-emitting layer, the voltage difference between the first electrode layer and the second electrode layer is minimal, and the voltage drop in the region is also minimal.
8. The light source according to claim 1, wherein, When the current in the first light-emitting layer is greater than the current in the second light-emitting layer: The difference between the maximum and minimum voltage drop across the first light-emitting layer is equal to the IR drop from the first junction region of the first electrode layer to the center region of the first electrode layer plus the IR drop from the second junction region of the second electrode layer to the center region of the second electrode layer.
9. The light source according to claim 1, wherein, When the current in the first light-emitting layer is greater than the current in the second light-emitting layer: When the second light-emitting layer is configured to emit light, one or more regions of the second light-emitting layer that are closest to the second bonding region are the brightest regions of the second light-emitting layer. In one or more regions of the second light-emitting layer that are closest to the second bonding region, the voltage difference between the second electrode layer and the third electrode layer is the largest; When the second light-emitting layer is configured to emit light, one or more regions of the second light-emitting layer that are furthest from the second bonding region are the darkest regions of the second light-emitting layer. as well as In one or more regions of the second light-emitting layer that are furthest from the second bonding region, the voltage difference between the second electrode layer and the third electrode layer is minimal.
10. The light source according to claim 1, wherein, When the current in the first light-emitting layer is greater than the current in the second light-emitting layer: The difference between the maximum and minimum voltage drop across the second light-emitting layer is equal to the IR drop from the second junction region of the second electrode layer to the center region of the second electrode layer plus the IR drop from the third junction region of the third electrode layer to the center region of the third electrode layer.
11. The light source according to claim 1, wherein, When the current in the second light-emitting layer is greater than the current in the first light-emitting layer, and the difference between the IR drop from the first junction region of the first electrode layer to the center region of the first electrode layer and the IR drop from the second junction region of the second electrode layer to the center region of the second electrode layer is positive: When the first light-emitting layer is configured to emit light, the central region of the first light-emitting layer is the darkest region of the first light-emitting layer; as well as In the central region of the first light-emitting layer, the voltage difference between the first electrode layer and the second electrode layer is minimal, and the voltage drop in the central region is also minimal.
12. The light source according to claim 1, wherein, When the current in the second light-emitting layer is greater than the current in the first light-emitting layer, and the difference between the IR drop from the first junction region of the first electrode layer to the center region of the first electrode layer and the IR drop from the second junction region of the second electrode layer to the center region of the second electrode layer is negative: When the first light-emitting layer is configured to emit light, the central region of the first light-emitting layer is the brightest region of the first light-emitting layer. as well as In the central region of the first light-emitting layer, the voltage difference between the first electrode layer and the second electrode layer is the largest, and the voltage drop in the region is also the largest.
13. The light source according to claim 1, wherein, When the current in the second light-emitting layer is greater than the current in the first light-emitting layer: When the second light-emitting layer is configured to emit light, the central region of the second light-emitting layer is the darkest region of the second light-emitting layer; and In the central region of the second light-emitting layer, the voltage difference between the second electrode layer and the third electrode layer is minimal.
14. The light source according to claim 1, wherein, When the current in the second light-emitting layer is greater than the current in the first light-emitting layer: The difference between the maximum and minimum voltage drop across the second light-emitting layer is equal to the IR drop from the second junction region of the second electrode layer to the center region of the second electrode layer plus the IR drop from the third junction region of the third electrode layer to the center region of the third electrode layer.
15. The light source according to claim 1, further comprising a junction region of the first electrode layer, the second electrode layer and the third electrode layer, wherein the junction region is located in the peripheral region of the light source; in, The first bonding regions of the first electrode layer are located on the first side and the second side of the light source, respectively. The second bonding regions of the second electrode layer are located on the third and fourth sides of the light source, respectively; The third bonding regions of the third electrode layer are located on the fifth and sixth sides of the light source, respectively; The first side and the second side are opposite to each other; The third side and the fourth side are opposite to each other; The fifth side and the sixth side are opposite to each other; The fourth side connects the first side and the sixth side; The sixth side connects the fourth side and the second side; The second side connects the sixth side and the third side; The third side connects the second side and the fifth side; and The fifth side connects the third side and the first side.
16. The light source according to claim 15, wherein, On the first side, the light source includes at least one of the first junction regions; On the second side, the light source includes at least one of the first junction regions; On the third side, the light source includes at least one of the second junction regions; On the fourth side, the light source includes at least one of the second bonding regions; On the fifth side, the light source includes at least one of the third junction regions; and On the sixth side, the light source includes at least one of the third junction regions.
17. The light source according to claim 1, wherein, The maximum voltage drop of the first electrode layer is K1X; The maximum voltage drop of the third electrode layer is K2Y; The maximum voltage drop of the second electrode layer is |K3X-K4Y|; K1 is a proportionality constant associated with the first electrode layer; K2 is a proportionality constant associated with the third electrode layer; K3 and K4 are proportionality constants associated with the second electrode layer; X represents the brightness of the first light-emitting layer; and Y represents the brightness of the second light-emitting layer.
18. The light source according to claim 17, wherein, When the current density of the first light-emitting layer is greater than the current density of the second light-emitting layer: The voltage difference between the brightest and darkest regions of the first light-emitting layer is K1X+|K3X-K4Y|; and The voltage difference between the brightest and darkest regions of the second light-emitting layer is |K3X-K4Y|+K2Y.
19. The light source according to claim 17, wherein, When the current density of the second light-emitting layer is greater than the current density of the first light-emitting layer: The voltage difference between the brightest and darkest regions of the first light-emitting layer is K1X - |K3X - K4Y|; and The voltage difference between the brightest and darkest regions of the second light-emitting layer is |K3X-K4Y|+K2Y.
20. A method for operating a light source; in, The light source includes: First electrode layer; A first light-emitting layer is located on the first electrode layer; The second electrode layer is located on the side of the first light-emitting layer away from the first electrode layer; A second light-emitting layer is located on the side of the second electrode layer away from the first light-emitting layer; and The third electrode layer is located on the side of the second light-emitting layer away from the second electrode layer; The method includes operating the light source in a first mode; In the first mode, the first light-emitting layer is configured to emit light, and the second light-emitting layer is configured not to emit light. The difference between the maximum and minimum voltage drop across the first light-emitting layer is less than a first threshold. The difference between the maximum and minimum voltage drops across the first light-emitting layer is equal to the IR drop from the first junction region of the first electrode layer to the center region of the first electrode layer plus the IR drop from the second junction region of the second electrode layer to the center region of the second electrode layer; and The first threshold is the value when the brightness uniformity of the light source is greater than 95%.