CN104319355B - A kind of luminescent device and drive control method, light fixture - Google Patents
A kind of luminescent device and drive control method, light fixture Download PDFInfo
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- CN104319355B CN104319355B CN201410669436.XA CN201410669436A CN104319355B CN 104319355 B CN104319355 B CN 104319355B CN 201410669436 A CN201410669436 A CN 201410669436A CN 104319355 B CN104319355 B CN 104319355B
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000003086 colorant Substances 0.000 claims description 34
- 239000000758 substrate Substances 0.000 claims description 13
- 238000004020 luminiscence type Methods 0.000 abstract description 9
- 238000005286 illumination Methods 0.000 abstract description 3
- 239000004065 semiconductor Substances 0.000 abstract description 3
- 230000004888 barrier function Effects 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 11
- 239000004020 conductor Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 229910021389 graphene Inorganic materials 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
- 229920001609 Poly(3,4-ethylenedioxythiophene) Polymers 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 229910001316 Ag alloy Inorganic materials 0.000 description 1
- -1 Polyethylene Terephthalate Polymers 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
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- 239000002096 quantum dot Substances 0.000 description 1
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
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Abstract
The invention provides a kind of luminescent device and drive control method, light fixture, relate to technical field of semiconductor illumination.Wherein luminescent device includes multiple luminescence units stacked together, and the color of the light that can send is different；It is arranged at the insulating barrier between adjacent two luminescence units；The anode of multiple luminescence units is all connected with same anode voltage control circuit, and the negative electrode of multiple luminescence units is connected with multiple cathode voltage control circuits one to one；Or the anode of multiple luminescence units is connected with multiple anode voltage control circuits one to one, the negative electrode of multiple luminescence units is all connected with same cathode voltage control circuit；Or the anode of multiple luminescence units is connected with multiple anode voltage control circuits one to one, the negative electrode of multiple luminescence units is connected with multiple cathode voltage control circuits one to one.This luminescent device can send the light of multiple color, and can carry out the switching of glow color.
Description
Technical Field
The invention relates to the technical field of semiconductor lighting, in particular to a light-emitting device, a driving control method thereof and a lamp.
Background
An OLED (Organic Light Emitting Diode) generally includes an anode, a Light Emitting layer and a cathode, wherein the Light Emitting layer is formed by an Organic semiconductor material, the anode injects holes into the Light Emitting layer under the driving of an electric field, the cathode injects electrons into the Light Emitting layer, and the holes and the electrons are combined in the Light Emitting layer to excite the Light Emitting layer material to emit Light. Because the OLED has the advantages of planar luminescence, ultrathin property, transparence, flexibility, high efficiency, energy conservation, environmental protection and the like, the OLED has great development potential in two application fields of display and illumination and obtains wide attention.
The OLED can realize that the light-emitting color can be adjusted freely in a visible light region (including light with colors of red, green, blue, white and the like) by changing the molecular structure of the material of the light-emitting layer. However, the current OLED light emitting devices can only perform a single color or white illumination mode, that is, one OLED light emitting device can only provide one color, and color alternation cannot be performed.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to solve the technical problems that: a light emitting device, a driving control method thereof and a lamp are provided to achieve the purposes that one light emitting device can provide light with multiple colors and can switch colors.
In order to achieve the purpose, the invention adopts the following technical scheme:
a first aspect of the present invention provides a light emitting device comprising: a plurality of light emitting units stacked together, each of the light emitting units including an anode, a cathode, and a light emitting layer between the anode and the cathode, the plurality of light emitting units being capable of emitting light of different colors; the insulating layer is arranged between two adjacent light-emitting units and used for keeping the two adjacent light-emitting units insulated from each other; at least one anode voltage control circuit connected to the anode of the light emitting unit; at least one cathode voltage control circuit connected to a cathode of the light emitting unit; the anodes of the light-emitting units are connected with the same anode voltage control circuit, and the cathodes of the light-emitting units are connected with the cathode voltage control circuits in a one-to-one correspondence manner; or the anodes of the light-emitting units are connected with a plurality of anode voltage control circuits in a one-to-one correspondence manner, and the cathodes of the light-emitting units are connected with the same cathode voltage control circuit; or the anodes of the light-emitting units are connected with the anode voltage control circuits in a one-to-one correspondence mode, and the cathodes of the light-emitting units are connected with the cathode voltage control circuits in a one-to-one correspondence mode.
Preferably, in the light emitting unit located at the bottom, the anode is located at the bottommost layer, and the anode exceeds the coverage of the light emitting layer and the cathode, and the part of the anode exceeding the coverage of the light emitting layer and the cathode is an excess part; the anode of the light emitting unit stacked on the bottom light emitting unit is in electrical contact with the excess portion of the anode of the bottom light emitting unit; the anodes of the light-emitting units positioned at the bottom are connected with an anode voltage control circuit, and the cathodes of the light-emitting units are connected with a plurality of cathode voltage control circuits in a one-to-one correspondence manner.
Preferably, in the light emitting unit located at the bottom, the cathode is located at the bottommost layer, and the cathode exceeds the coverage of the light emitting layer and the anode, and the part of the cathode exceeding the coverage of the light emitting layer and the anode is an excess part; the cathode of the light emitting unit stacked on the light emitting unit positioned at the bottom is in contact with the excess part of the cathode of the light emitting unit positioned at the bottom; the cathode of the light-emitting unit positioned at the bottom is connected with a cathode voltage control circuit, and the anodes of the light-emitting units are connected with the anode voltage control circuits in a one-to-one correspondence manner.
Preferably, the coverage areas of the film layers of the light-emitting units are the same, the anodes of the light-emitting units are connected with the anode voltage control circuits in a one-to-one correspondence, and the cathodes of the light-emitting units are connected with the cathode voltage control circuits in a one-to-one correspondence.
Preferably, each film layer of the plurality of light-emitting units is a transparent film layer; or the film layer at the bottommost layer in the light-emitting unit at the bottom is an opaque film layer, and the film layers stacked on the film layer at the bottommost layer in the light-emitting unit at the bottom are all transparent film layers; or, the film layer positioned at the topmost layer in the light emitting unit positioned at the top is an opaque film layer, and the film layers positioned below the film layer positioned at the topmost layer in the light emitting unit positioned at the top are transparent film layers.
Preferably, the light emitting device includes three light emitting units emitting red, green and blue light, respectively; alternatively, the light emitting device includes four light emitting units emitting red, green, blue, and yellow light, respectively.
Preferably, the light emitting device further includes: the light-emitting units are stacked on the transparent substrate.
A second aspect of the present invention provides a drive control method of a light emitting device for driving the above-described light emitting device, the drive control method being: when the required light-emitting color is one of the light-emitting colors of the single light-emitting units in the light-emitting device, controlling the light-emitting units incapable of emitting the light of the required color to be turned off by using an anode voltage control circuit and a cathode voltage control circuit which are connected with the light-emitting units incapable of emitting the light of the required color, and simultaneously controlling the light-emitting units capable of emitting the light of the required color to be turned on by using an anode voltage control circuit and a cathode voltage control circuit which are connected with the light-emitting units capable of emitting the light of the required color; when the required emission color is a mixed color of emission colors of at least two light emitting units in the light emitting device, the light emitting units incapable of emitting light of the colors required for forming the mixed color are controlled to be turned off by an anode voltage control circuit and a cathode voltage control circuit connected to the light emitting units incapable of emitting light of the colors required for forming the mixed color, and the light emitting units capable of emitting light of the colors required for forming the mixed color are controlled to be turned on by an anode voltage control circuit and a cathode voltage control circuit connected to the light emitting units capable of emitting light of the colors required for forming the mixed color.
Preferably, the driving method further includes: when the light emitting unit is turned on, the voltage difference between the anode and the cathode of the turned-on light emitting unit is adjusted by using an anode voltage control circuit and a cathode voltage control circuit which are connected with the turned-on light emitting unit so as to change the light emitting brightness of the turned-on light emitting unit.
A third aspect of the invention provides a luminaire comprising a light emitting device as described above.
In the light emitting device, the driving control method thereof and the lamp provided by the invention, the light emitting device comprises a plurality of stacked light emitting units, the adjacent two light emitting units are kept insulated by arranging the insulating layer, the colors of light emitted by the light emitting units are different, the anode of each light emitting unit is connected with the anode voltage control circuit, the cathode of each light emitting unit is connected with the cathode voltage control circuit, the anodes and/or cathodes of all the light emitting units included in the light emitting device are correspondingly connected with the voltage control circuits one by one, namely, the light emitting units are in parallel connection, the independent driving control of the light emitting units is realized, so that the voltage control circuits are used for controlling the corresponding light emitting units to be turned on or turned off, the required light emitting color can be obtained, and the light emitting color can be switched.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a first specific structural view of a light-emitting device provided in an embodiment of the present invention;
fig. 2 is a second specific structural view of a light-emitting device provided in an embodiment of the present invention;
fig. 3a is a third specific structural diagram of a light emitting device according to an embodiment of the present invention, in which an anode is formed before a cathode in the same light emitting unit;
fig. 3b is a third specific structural diagram of a light emitting device according to an embodiment of the present invention, in which a cathode is formed before an anode in the same light emitting unit.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present embodiment provides a light emitting device including: a plurality of light emitting units stacked together, each light emitting unit including an anode, a cathode, and a light emitting layer between the anode and the cathode, the plurality of light emitting units being capable of emitting light of different colors; the insulating layer is arranged between two adjacent light-emitting units and used for keeping the two adjacent light-emitting units insulated from each other; at least one anode voltage control circuit connected to an anode of the light emitting unit; and at least one cathode voltage control circuit connected to the cathode of the light emitting unit.
The anodes of the light-emitting units are connected with the same anode voltage control circuit, and the cathodes of the light-emitting units are connected with the cathode voltage control circuits in a one-to-one correspondence manner; or the anodes of the light-emitting units are connected with the anode voltage control circuits in a one-to-one correspondence manner, and the cathodes of the light-emitting units are connected with the same cathode voltage control circuit; or the anodes of the light-emitting units are connected with the anode voltage control circuits in a one-to-one correspondence mode, and the cathodes of the light-emitting units are connected with the cathode voltage control circuits in a one-to-one correspondence mode.
The light emitting device has the advantages that the plurality of light emitting units are stacked together, the colors of light emitted by the plurality of light emitting units are different, the two adjacent light emitting units are insulated through the insulating layer, the anode of each light emitting unit is connected with the anode voltage control circuit, the cathode of each light emitting unit is connected with the cathode voltage control circuit, and therefore the plurality of light emitting units are connected in parallel, and the plurality of light emitting units can be driven independently. By controlling the opening of at least one light-emitting unit, the light display of single color or at least two color mixed colors can be realized, and the switching of different light-emitting colors can be carried out.
The present embodiment specifically provides three specific structures of the above-described light emitting device. As shown in fig. 1, a first specific structure diagram of a light emitting device provided in this embodiment is a light emitting device, the light emitting device is located in a light emitting unit 1 at the bottom, an anode 11 is located at the bottommost layer, the anode 11 is beyond the coverage of a light emitting layer 12 and a cathode 13, and a part of the anode 11 beyond the coverage of the light emitting layer 12 and the cathode 13 is an excess part; the anode 11 of the light emitting unit 1 stacked on the light emitting unit 1 located at the bottom is in electrical contact with the excess portion of the anode 11 of the light emitting unit 1 located at the bottom; the anode 11 of the light emitting unit 1 at the bottom is connected to an anode voltage control circuit 3, and the cathodes 13 of the light emitting units 1 are connected to the cathode voltage control circuits 4 in a one-to-one correspondence.
It should be noted that "the light-emitting unit 1 located at the bottom" described in this embodiment refers to a light-emitting unit formed first in all the light-emitting units 1 included in one light-emitting device, and "the light-emitting unit 1 located at the top" refers to a light-emitting unit formed last in all the light-emitting units 1 included in one light-emitting device; "… is at the lowermost layer" means "…" which is the first film layer among all the film layers of all the light emitting cells 1 included in one light emitting device, and "… is at the uppermost layer" means "…" which is the last film layer among all the film layers of all the light emitting cells 1 included in one light emitting device.
In the light emitting device having the above structure, by making the anode 11 of the bottom layer light emitting unit 1 exceed the light emitting layer 12 and the cathode 13 thereof, in the process of subsequently forming other light emitting units 1 stacked on the bottom layer light emitting unit 1, the anode 11 of the other light emitting units 1 can be electrically connected to the anode 11 of the bottom layer light emitting unit 1 by contacting the excess portion of the anode 11 of the bottom layer light emitting unit 1. At this time, the voltage of the anodes 11 of all the light emitting units 1 can be controlled by connecting only the anode 11 of the bottom light emitting unit 1 to one anode voltage control circuit 3, the voltage of the anodes 11 of all the light emitting units 1 is the same, and the cathodes 13 of all the light emitting units 1 are respectively connected to different cathode voltage control circuits 4, so that the cathodes 13 of all the light emitting units 1 are respectively controlled, and further, the voltage difference between the anode 11 and the cathode 13 of each light emitting unit 1 is independently controlled. In the light emitting device with the structure, the anodes 11 of all the light emitting units 1 share the same anode voltage control circuit 3, so that the structure of the device is simplified, and the power consumption of the device is reduced.
More specifically, the cross-sectional shape of the anode 11, which needs to be electrically contacted with the anode 11 of the bottom light-emitting unit 1, in the light-emitting units 11 stacked on the bottom light-emitting unit 1 may be an inverted "L" shape, and the cross-sectional shape includes a horizontal portion and a vertical portion, the horizontal portion covers the bottom light-emitting unit 1, the vertical portion extends along the side wall of the bottom light-emitting unit 1, and the vertical portion is contacted with the excess portion of the anode 11 of the bottom light-emitting unit 1, so that the anode 11 of each light-emitting unit 1 stacked on the bottom light-emitting unit 1 is electrically connected with the anode 11 of the bottom light-emitting unit.
It should be noted that, in order to ensure electrical insulation between the light emitting units 1, the insulating layer 2 preferably extends along with the extension of the anode 11 in contact with itself; specifically, if the cross-sectional shape of the anode 11, which is required to be in electrical contact with the anode 11 of the bottom emission unit 1, in the emission unit 11 stacked on the bottom emission unit 1 may be an inverted "L" shape, the insulating layer 2 in contact with them is also an inverted "L" shape.
In addition, the insulating layer 2 has the function of flattening the film layer formed before the insulating layer itself, and providing a flat growth interface for the subsequently formed film layer, so as to improve the quality of the film layer.
As shown in fig. 2, a second specific structure diagram of the light emitting device provided in this embodiment is a light emitting device, the light emitting device is located in the light emitting unit 1 at the bottom, the cathode 13 is located at the bottommost layer, the cathode 13 is beyond the coverage of the light emitting layer 12 and the anode 11, and the part of the cathode 13 beyond the coverage of the light emitting layer 12 and the anode 11 is an excess part; the cathode 13 of the light emitting unit 1 stacked on the light emitting unit 1 located at the bottom is in contact with the excess portion of the cathode 13 of the light emitting unit 1 located at the bottom; the cathode 13 of the light emitting unit 1 at the bottom is connected to a cathode voltage control circuit 4, and the anodes 11 of the plurality of light emitting units are connected to the plurality of anode voltage control circuits 3 in a one-to-one correspondence.
In the light emitting device having the above-described configuration, the cathodes 13 of the light emitting units 1 share the same cathode voltage control circuit 4, so that the voltages of the cathodes 13 of the light emitting units 1 are the same, and the anodes 11 of the light emitting units 1 are connected to different anode voltage control circuits 3, respectively, so that the voltage difference between the anode 11 and the cathode 13 of each light emitting unit 1 can be realized by controlling the voltages applied to the anodes 11 by the anode voltage control circuits 3, respectively. The light-emitting device has the advantages of simple structure and low power consumption, and is suitable for a light-emitting structure formed by the cathode 13 before the anode 11.
As shown in fig. 3a and fig. 3b, for a third specific structure of the light emitting device provided in this embodiment, the coverage areas of the film layers of the light emitting units 1 of the light emitting device are the same, the anodes 11 of the light emitting units 1 are connected to the anode voltage control circuits 3 in a one-to-one correspondence, and the cathodes 13 of the light emitting units 1 are connected to the cathode voltage control circuits 4 in a one-to-one correspondence. The light-emitting device with the structure can realize the independent control of the voltage of the anode 11 of each light-emitting unit 1 and the voltage of the cathode 13 of each light-emitting unit 1, so that the adjustable range and the adjustment freedom of the driving voltage of each light-emitting unit 1 are larger, and the requirements on higher light-emitting quality (such as brightness, saturation, chromaticity and the like) can be met.
The structure shown in fig. 3a is applied to a light-emitting structure in which the anode 11 is formed before the cathode 13 in the light-emitting unit 1, and the structure shown in fig. 3b is applied to a light-emitting structure in which the cathode 13 is formed before the anode 11 in the light-emitting unit 1.
In addition, the present embodiment is described by taking the light emitting devices of the above three specific structures as examples, and in other embodiments of the present invention, the connection manner of the anode 11 and the anode voltage control circuit 3 and the connection manner of the cathode 13 and the cathode voltage control circuit 4 of each light emitting unit 1 are not limited to the above three, for example: the anode 11 (or cathode 13) of one part of the light-emitting units 1 can share the same anode voltage control circuit 3 (or cathode voltage control circuit 4), and the anode 11 (or cathode 13) of another part of the light-emitting units 1 can share another anode voltage control circuit 3 (or cathode voltage control circuit 4); or the anodes 11 (or cathodes 13) of a part of the light emitting units 1 may share the same anode voltage control circuit 3 (or cathode voltage control circuit 4), and the anodes 11 of another part of the light emitting units 1 are respectively connected to another plurality of anode voltage control circuits 3 (or cathode voltage control circuits 4) in a one-to-one correspondence manner, so as to satisfy the requirements for different light emitting colors on the basis of simplifying the device structure to different degrees.
The light emitting device provided by the embodiment can be manufactured into a light emitting device with double-sided light emitting, and at this time, each film layer of the plurality of light emitting units 1 needs to be set as a transparent film layer; or the light emitting device can be manufactured as a bottom light emitting device, at this time, the film layer at the bottommost layer in the light emitting unit 1 at the bottom needs to be an opaque film layer, and the film layers stacked on the film layer at the bottommost layer in the light emitting unit 1 at the bottom need to be transparent film layers; or the light emitting device can be manufactured as a top-emitting light emitting device, in which the film layer at the topmost layer in the top light emitting unit 1 needs to be an opaque film layer, and the film layers below the film layer at the topmost layer in the top light emitting unit 1 need to be transparent film layers.
Further, if the anode 11 is an opaque film, a structure in which a transparent conductive material (such as ITO (Indium Tin Oxide), Graphene (Graphene), PEDOT (quantum dot material), etc.) and a reflective material (such as Al) are stacked may be adopted, or a conductive material with a high reflective coefficient may be directly adopted to form the anode; if the anode 11 is a transparent film layer, it can be formed directly by using transparent conductive materials such as ITO, Graphene, PEDOT, PSS and the like; if the cathode 13 is an opaque film, it can be formed by a conductive material with high reflection coefficient (such as Al), or a laminated structure of a transparent conductive material and a reflective material; if the cathode 13 is a transparent film, a transparent conductive material (e.g., ITO, mg-ag alloy, etc.) may be used.
In this embodiment, the light emitting device preferably includes three light emitting units 1, which respectively emit red light, green light, and blue light, so that the color of light emitted by the light emitting device can be white formed by red, green, blue, red-green mixed color, red-blue mixed color, green-blue mixed color, and red-green-blue mixed color; or the light emitting device may preferably include four light emitting units 1 that respectively emit red light, green light, blue light, and yellow light, so that the color of light that can be emitted by the light emitting device may be red, green, blue, yellow, red-green color mixture, red-blue color mixture, red-yellow color mixture, green-blue color mixture, green-yellow color mixture, blue-yellow color mixture, white formed by red-green-blue color mixture, red-green-yellow color mixture, red-blue-yellow color mixture, green-blue-yellow color mixture, or red-green-blue-yellow color mixture, and the existence of the yellow light emitting unit 1 may significantly improve the color gamut of light that can be emitted by the light emitting device.
It should be noted that the present embodiment is only described by taking the case where the light emitting device includes three light emitting units of red, green and blue or four light emitting units of red, green, blue and yellow as an example, and in other embodiments of the present invention, the light emitting unit 1 capable of emitting light of other colors may be disposed according to actual needs.
As shown in fig. 1, fig. 2, fig. 3a and fig. 3b, the light emitting device provided in this embodiment may further include a transparent substrate 5, the light emitting units 1 are stacked on the transparent substrate 5, and the transparent substrate 5 may be a transparent glass substrate to meet the production requirement of the hard light emitting device, or a polymer transparent substrate (e.g., PI (Polyimide Film), PET (Polyethylene Terephthalate) Film, etc.) to meet the production requirement of the flexible light emitting device.
Further, the transparent substrate 5 may be a substrate produced by integrating the anode 11 or the cathode 13, that is, the transparent substrate 5 may be a substrate with a conductive film, such as: the glass substrate with ITO, the PET substrate with Graphene and the like can omit the manufacture of a film layer of a light-emitting device and shorten the period of the process.
The present embodiment also provides a drive control method for driving the above light emitting device, the drive control method being: when the required light emitting color is one of the light emitting colors of the single light emitting unit in the light emitting device, controlling the light emitting unit incapable of emitting the light of the required color to be turned off by using an anode voltage control circuit and a cathode voltage control circuit connected to the light emitting unit incapable of emitting the light of the required color, and controlling the light emitting unit capable of emitting the light of the required color to be turned on by using an anode voltage control circuit and a cathode voltage control circuit connected to the light emitting unit capable of emitting the light of the required color;
when the required light emission color is a mixed color of light emission colors of at least two light emitting units in the light emitting device, the light emitting units incapable of emitting light of colors required for forming the mixed color are controlled to be turned off by an anode voltage control circuit and a cathode voltage control circuit connected to the light emitting units incapable of emitting light of colors required for forming the mixed color, and the light emitting units capable of emitting light of colors required for forming the mixed color are controlled to be turned on by an anode voltage control circuit and a cathode voltage control circuit connected to the light emitting units capable of emitting light of colors required for forming the mixed color.
By using the driving control method, the light emitting device provided by the embodiment can emit various single-color or mixed-color lights only in a passive driving mode, and can realize switching of different light emitting colors.
The following describes a driving control method of the light emitting device shown in fig. 1 in detail as an example.
If the light emitting device is required to emit red light, a voltage may be applied to the anodes 11 of the three light emitting cells 1 of red, green and blue included in the light emitting device using the anode voltage control voltage 3; turning off the cathode voltage control circuit 4 connected to the cathode 13 of the green light emitting unit 1 and the cathode voltage control circuit 4 connected to the cathode 13 of the blue light emitting unit 1 so that the green light emitting unit 1 and the blue light emitting unit 1 do not emit light; a voltage is applied to the cathode 13 of the red light emitting unit 1 by the cathode voltage control circuit 4 connected to the cathode 13 of the red light emitting unit 1, so that the red light emitting unit 1 emits red light.
Similarly, the light emitting device may be controlled to emit green or blue light.
If it is desired that the light emitting device emits yellow light, since yellow can be formed by mixing red and green, a voltage can be applied to the anodes 11 of the three light emitting cells 1 of red, green and blue included in the light emitting device using the anode voltage control voltage 3; turning off the cathode voltage control circuit 4 connected to the cathode 13 of the blue light emitting unit 1 so that the blue light emitting unit 1 does not emit light; a voltage is applied to the cathode 13 of the red light emitting unit 1 by the cathode voltage control circuit 4 connected to the cathode 13 of the red light emitting unit 1, and a voltage is applied to the cathode 13 of the green light emitting unit 1 by the cathode voltage control circuit 4 connected to the cathode 13 of the green light emitting unit 1, so that the red light emitting unit 1 emits red light, the green light emitting unit 1 emits green light, and the red light and the green light are mixed to make the light emitted from the light emitting device yellow.
Similarly, the light emitting device may be controlled to emit light of a red-blue mixed color or light of a green-blue mixed color.
If the light emitting device is required to emit white light, since white light may be formed by mixing red, green and blue colors, a voltage may be applied to the anodes 11 of the three light emitting units 1 of red, green and blue included in the light emitting device using the anode voltage control voltage 3; a voltage is applied to the cathode 13 of the red light emitting unit 1 by the cathode voltage control circuit 4 connected to the cathode 13 of the red light emitting unit 1, a voltage is applied to the cathode 13 of the green light emitting unit 1 by the cathode voltage control circuit 4 connected to the cathode 13 of the green light emitting unit 1, and a voltage is applied to the cathode 13 of the blue light emitting unit 1 by the cathode voltage control circuit 4 connected to the cathode 13 of the blue light emitting unit 1, so that the red light emitting unit 1 emits red light, the green light emitting unit 1 emits green light, and the blue light emitting unit 1 emits blue light, and the red light, the green light, and the blue light are mixed to make the light emitted by the light emitting device white.
Further, when the light emitting unit 1 is turned on, the voltage difference between the anode 11 and the cathode 13 of the turned-on light emitting unit 1 can be adjusted by using the anode voltage control circuit 3 and the cathode voltage control circuit 4 connected to the turned-on light emitting unit 1 to change the light emitting luminance of the turned-on light emitting unit 1.
The embodiment also provides a lamp comprising the light emitting device, the lamp can illuminate light with multiple colors, the light emitting color of the lamp can be switched among different colors, and the requirement of people on color diversification of the lamp is met.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (7)
1. A light emitting device, comprising:
a plurality of light emitting units stacked together, each of the light emitting units including an anode, a cathode, and a light emitting layer between the anode and the cathode, the plurality of light emitting units being capable of emitting light of different colors;
the insulating layer is arranged between two adjacent light-emitting units and used for keeping the two adjacent light-emitting units insulated from each other;
at least one anode voltage control circuit connected to the anode of the light emitting unit;
at least one cathode voltage control circuit connected to a cathode of the light emitting unit;
in the light-emitting unit positioned at the bottom, the anode is positioned at the bottommost layer and exceeds the coverage range of the light-emitting layer and the cathode, and the part of the anode exceeding the coverage range of the light-emitting layer and the cathode is an exceeding part; the anode of the light emitting unit stacked on the bottom light emitting unit is in electrical contact with the excess portion of the anode of the bottom light emitting unit; the anodes of the light-emitting units positioned at the bottom are connected with an anode voltage control circuit, and the cathodes of the light-emitting units are connected with a plurality of cathode voltage control circuits in a one-to-one correspondence manner; or,
in the light-emitting unit positioned at the bottom, the cathode is positioned at the bottommost layer and exceeds the coverage range of the light-emitting layer and the anode, and the part of the cathode exceeding the coverage range of the light-emitting layer and the anode is an exceeding part; the cathode of the light emitting unit stacked on the light emitting unit positioned at the bottom is in contact with the excess part of the cathode of the light emitting unit positioned at the bottom; the cathode of the light-emitting unit positioned at the bottom is connected with a cathode voltage control circuit, and the anodes of the light-emitting units are connected with the anode voltage control circuits in a one-to-one correspondence manner.
2. The light-emitting device according to claim 1, wherein each of the film layers of the plurality of light-emitting units is a transparent film layer; or,
the film layer at the bottommost layer in the light-emitting unit at the bottom is an opaque film layer, and the film layers stacked on the film layer at the bottommost layer in the light-emitting unit at the bottom are transparent film layers; or,
the film layer positioned at the topmost layer in the light-emitting unit positioned at the top is an opaque film layer, and the film layers positioned below the film layer positioned at the topmost layer in the light-emitting unit positioned at the top are transparent film layers.
3. The light-emitting device according to claim 1, wherein the light-emitting device comprises three light-emitting units that emit red light, green light, and blue light, respectively; alternatively, the light emitting device includes four light emitting units emitting red, green, blue, and yellow light, respectively.
4. The light-emitting device according to claim 1, further comprising: the light-emitting units are stacked on the transparent substrate.
5. A drive control method for a light emitting device, for driving the light emitting device according to any one of claims 1 to 4, the drive control method comprising:
when the required light-emitting color is one of the light-emitting colors of the single light-emitting units in the light-emitting device, controlling the light-emitting units incapable of emitting the light of the required color to be turned off by using an anode voltage control circuit and a cathode voltage control circuit which are connected with the light-emitting units incapable of emitting the light of the required color, and simultaneously controlling the light-emitting units capable of emitting the light of the required color to be turned on by using an anode voltage control circuit and a cathode voltage control circuit which are connected with the light-emitting units capable of emitting the light of the required color;
when the required emission color is a mixed color of emission colors of at least two light emitting units in the light emitting device, the light emitting units incapable of emitting light of the colors required for forming the mixed color are controlled to be turned off by an anode voltage control circuit and a cathode voltage control circuit connected to the light emitting units incapable of emitting light of the colors required for forming the mixed color, and the light emitting units capable of emitting light of the colors required for forming the mixed color are controlled to be turned on by an anode voltage control circuit and a cathode voltage control circuit connected to the light emitting units capable of emitting light of the colors required for forming the mixed color.
6. The drive control method of a light emitting device according to claim 5, characterized in that the drive method further comprises: when the light emitting unit is turned on, the voltage difference between the anode and the cathode of the turned-on light emitting unit is adjusted by using an anode voltage control circuit and a cathode voltage control circuit which are connected with the turned-on light emitting unit so as to change the light emitting brightness of the turned-on light emitting unit.
7. A lamp comprising the light-emitting device according to any one of claims 1 to 4.
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| CN108962930A (en) * | 2018-06-12 | 2018-12-07 | 南京阿吉必信息科技有限公司 | A kind of full-color array of display structure of LED and preparation method |
| CN110246832B (en) * | 2019-07-04 | 2024-04-30 | 深圳市思坦科技有限公司 | Light emitting device, preparation method of light emitting device and display device |
| CN114300505B (en) * | 2021-12-31 | 2024-08-23 | 厦门天马微电子有限公司 | Light-emitting module and display device |
| CN115394216B (en) * | 2022-10-20 | 2023-07-14 | 季华实验室 | Display device and display equipment |
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