CN108305951B - Organic light emitting diode device, driving method thereof, display panel and display device - Google Patents
Organic light emitting diode device, driving method thereof, display panel and display device Download PDFInfo
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- CN108305951B CN108305951B CN201810003063.0A CN201810003063A CN108305951B CN 108305951 B CN108305951 B CN 108305951B CN 201810003063 A CN201810003063 A CN 201810003063A CN 108305951 B CN108305951 B CN 108305951B
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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
- H10K50/85—Arrangements for extracting light from the devices
- H10K50/852—Arrangements for extracting light from the devices comprising a resonant cavity structure, e.g. Bragg reflector pair
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/50—OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal elements
Abstract
The application discloses an organic light emitting diode device and a driving method thereof, a display panel and a display device, which are used for enabling a single white light organic light emitting diode device to emit light with different colors according to needs, so that a color filter is avoided, the light emitting efficiency of a display product is improved, the pixel density of the display product is improved, and the display effect of the display product is improved. An organic light emitting diode device provided in an embodiment of the present application includes: a cathode and an anode, and an organic light emitting layer between the cathode and the anode, wherein the anode includes a reflective layer and the cathode includes a transmissive layer; a liquid crystal cell positioned between the reflective layer and the transmissive layer, the liquid crystal cell including a first electrode and a second electrode, liquid crystal in the liquid crystal cell being deflected by a voltage between the first electrode and the second electrode.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to an organic light emitting diode device, a driving method thereof, a display panel, and a display apparatus.
Background
Organic Light-Emitting diodes (OLEDs) are widely used in the fields of displays and the like because of their advantages of self-luminescence, high efficiency, low operating voltage, thinness, flexibility, and the like. In the prior art, OLED full-color display is generally implemented by a pixel including three color sub-pixels of red (R), green (G), and blue (B), and the RGB sub-pixels are mainly set in the following two ways: (1) r, G, B the OLED light-emitting layer corresponding to the sub-pixel is made of red light-emitting material, green light-emitting material and blue light-emitting material; however, in this arrangement, when the OLED light-emitting layer is prepared, more mask plates are required, and the OLED light-emitting yield is easily affected, which is not favorable for realizing high pixel density (PPI) display; (2) the light emitting layer of the OLED corresponding to each sub-pixel is a white light emitting material, and the R, G, B sub-pixel area is divided by using red, green and blue color filters; in this manner, since R, G, B sub-pixel regions need to be divided by color filters, the light color of R, G, B sub-pixel regions tends to cause crosstalk in the color filters, which affects the color purity of individual sub-pixel regions. In summary, in the prior art, the white OLED display device needs to realize full-color display and depends on a color filter, and the use of the color filter may cause the decrease of the light-emitting efficiency, thereby reducing the efficiency of the OLED device and increasing the manufacturing cost of the OLED device.
Disclosure of Invention
The embodiment of the application provides an organic light emitting diode device and a driving method thereof, a display panel and a display device, which are used for enabling a single white light organic light emitting diode device to emit light with different colors according to requirements, so that a color filter is avoided, the light emitting efficiency of a display product is improved, the pixel density of the display product is improved, and the display effect of the display product is improved.
An organic light emitting diode device provided in an embodiment of the present application includes:
a cathode and an anode, and an organic light emitting layer between the cathode and the anode, wherein the anode includes a reflective layer and the cathode includes a transmissive layer;
a liquid crystal cell positioned between the reflective layer and the transmissive layer, the liquid crystal cell including a first electrode and a second electrode, liquid crystal in the liquid crystal cell being deflected by a voltage between the first electrode and the second electrode.
An embodiment of the present application provides a method for driving the organic light emitting diode display device, where the method includes:
determining the current required light emitting color of the organic light emitting diode device;
providing voltage signals for the first electrode and the second electrode of the liquid crystal box according to the current required light color of the organic light emitting diode device, the preset corresponding relation between the light color of the organic light emitting diode device and the refractive index of the liquid crystal box and the preset relation between the refractive index of the liquid crystal box and the voltage signal for controlling the liquid crystal box, so that liquid crystal in the liquid crystal box deflects, and the liquid crystal box has the refractive index corresponding to the current required light color of the organic light emitting diode device.
The embodiment of the application also provides a display panel, which comprises the organic light-emitting diode device provided by the embodiment of the application.
The embodiment of the application also provides a display device which comprises the display panel provided by the embodiment of the application.
According to the organic light-emitting diode device and the driving method thereof, the display panel and the display device provided by the embodiment of the application, the reflecting layer, the transmission layer and the structures between the reflecting layer and the transmission layer form the optical microcavity, the organic light-emitting diode device is provided with the liquid crystal box between the reflecting layer and the transmission layer, liquid crystal in the liquid crystal box deflects under the action of voltage between the first electrode and the second electrode, the refractive index of the liquid crystal box changes along with the change of the voltage applied to the liquid crystal box due to the fact that the refractive indexes of the liquid crystal in the long axis direction and the short axis direction are different, and the effective optical path of the optical microcavity of the OLED device changes, so that the light-emitting color of the OLED. For the white light OLED device, with the change of the refractive index, the red light, the green light and the blue light in the white light can be separated, so that the white light OLED device can emit colored light by adjusting the refractive index of the white light OLED device, for example, the red light, the green light or the blue light can be emitted, namely, a single white light OLED device can emit light with different colors according to the requirement. Therefore, R, G, B sub-pixels do not need to be distinguished by arranging luminescent materials with different colors, and organic luminescent layers do not need to be arranged by adopting a plurality of masks, so that the yield of OLED devices can be prevented from being influenced, and the PPI of display products can be improved; the RGB sub-pixels of the white light OLED display product are not required to be distinguished by color filters with different colors, so that the reduction of light emitting efficiency, light color crosstalk and color group shielding caused by the use of the color filters can be avoided, the light emitting efficiency of the display product is improved, the display effect of the display product is improved, the PPI of the display product is improved, and the manufacturing cost of the display product can be reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an organic light emitting diode device according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of another organic light emitting diode device provided in an embodiment of the present application;
fig. 3 is a schematic structural diagram of another organic light emitting diode device provided in an embodiment of the present application;
fig. 4 is a schematic structural diagram of another organic light emitting diode device provided in an embodiment of the present application;
fig. 5 is a schematic structural diagram of another organic light emitting diode device provided in an embodiment of the present application;
fig. 6 is a schematic structural diagram of another organic light emitting diode device provided in an embodiment of the present application;
fig. 7 is a schematic structural diagram of another organic light emitting diode device provided in an embodiment of the present application;
fig. 8 is a schematic structural diagram of another organic light emitting diode device provided in an embodiment of the present application;
fig. 9 is a flowchart illustrating a driving method of an organic light emitting diode display device according to an embodiment of the present disclosure;
fig. 10 is a schematic structural diagram of a display panel according to an embodiment of the present application.
Detailed Description
The embodiment of the application provides an organic light emitting diode device and a driving method thereof, a display panel and a display device, which are used for enabling a single white light organic light emitting diode device to emit light with different colors according to requirements, so that a color filter is avoided, the light emitting efficiency of the display panel is improved, the pixel density of a display product is improved, and the display effect of the display product is improved.
An embodiment of the present application provides an organic light emitting diode device, including:
a cathode and an anode, and an organic light emitting layer between the cathode and the anode, wherein the anode includes a reflective layer and the cathode includes a transmissive layer;
a liquid crystal cell positioned between the reflective layer and the transmissive layer, the liquid crystal cell including a first electrode and a second electrode, liquid crystal in the liquid crystal cell being deflected by a voltage between the first electrode and the second electrode.
It should be noted that, in the organic light emitting diode device provided in this embodiment of the present application, the reflective layer, the transmissive layer and the structures between the reflective layer and the transmissive layer form an optical resonant cavity, an effective optical length of the optical microcavity is equal to a product of a refractive index of a medium of the optical microcavity and a propagation distance of light in the medium, and the optical resonant cavity satisfies a standing wave condition, and an optical length of the optical microcavity (i.e., the effective optical length of the optical microcavity) is equal to an integral multiple of a half wavelength, so that, under a condition that a geometric length of the optical microcavity is not changed, a change in the refractive index may cause a change in an outgoing.
According to the organic light-emitting diode device provided by the embodiment of the application, the liquid crystal box is arranged between the reflecting layer and the transmission layer, liquid crystal in the liquid crystal box deflects under the action of voltage between the first electrode and the second electrode, and the refractive indexes of the liquid crystal in the major axis direction and the minor axis direction are different, so that when the voltage applied to the liquid crystal box changes, the refractive index of the liquid crystal box also changes, the effective optical path of the optical microcavity of the OLED device changes, and the light-emitting color of the OLED device changes. Particularly, for the white light OLED device, with the change of the refractive index, the red light component, the green light component and the blue light component in the white light can be separated, so that the white light OLED device can emit colored light by adjusting the refractive index of the white light OLED device, for example, the red light component, the green light component or the blue light component can be emitted, namely, a single white light OLED device can emit light with different colors according to the requirement. Therefore, R, G, B sub-pixels are distinguished without arranging luminescent materials with different colors, and organic luminescent layers are arranged without adopting a plurality of mask plates, so that the yield of OLED devices can be prevented from being influenced, and the PPI of display products can be improved; the RGB sub-pixels of the white light OLED display product are not required to be distinguished by color filters with different colors, so that the reduction of light emitting efficiency, light color crosstalk and color group shielding caused by the use of the color filters can be avoided, the light emitting efficiency of the display product is improved, the display effect of the display product is improved, the PPI of the display product is improved, and the manufacturing cost of the display product can be reduced.
Optionally, the liquid crystal cell further comprises an alignment layer between the liquid crystal and the first electrode or between the liquid crystal and the second electrode. So that liquid crystals in the liquid crystal cell are aligned in a specific direction.
Optionally, the organic light emitting layer of the organic light emitting diode device provided in the embodiment of the present application emits white light.
Therefore, a single white light OLED device can emit light with different colors according to the requirement, R, G, B sub-pixels are not required to be distinguished by arranging luminescent materials with different colors, and an organic luminescent layer is not required to be arranged by adopting a plurality of mask plates, so that the yield of the OLED device can be prevented from being influenced, and the PPI of a display product can be improved; the display product does not need to be provided with color filters with different colors to distinguish RGB sub-pixels, so that the reduction of light extraction efficiency, light color crosstalk and color group shielding caused by the use of the color filters can be avoided, and further, the light extraction efficiency of the display product is improved, the display effect of the display product is improved, and the PPI of the display product is improved.
Optionally, the anode further comprises a transparent conductive layer between the organic light emitting layer and the reflective layer, and the liquid crystal cell is between the transparent conductive layer and the reflective layer. I.e. the liquid crystal cell is arranged at the anode of the OLED device. As shown in fig. 1, an organic light emitting diode device provided in an embodiment of the present application includes: the anode 1 and the anode 1 comprise a total reflection layer 2 and a transparent conductive layer 3, the organic light emitting diode device further comprises a liquid crystal box 4, an organic light emitting layer 5 and a cathode 6, wherein the liquid crystal box 4 is positioned between the total reflection layer 2 and the transparent conductive layer 3, and the liquid crystal box 4 comprises a first electrode 7, an orientation layer 8, a liquid crystal layer 9 and a second electrode 10.
It should be noted that, in the organic light emitting diode device provided in the embodiment of the present application, voltages need to be applied to the cathode and the anode to drive the organic light emitting layer to emit light, and voltages need to be applied to the first electrode and the second electrode of the liquid crystal cell, and when the color of light emitted from the organic light emitting diode device needs to be changed, the voltages applied to the liquid crystal cell are changed, so that liquid crystal in the liquid crystal cell is deflected. As shown in fig. 1, in the organic light emitting diode device, the first electrode and the second electrode of the liquid crystal cell are respectively in contact with the reflective layer and the transparent conductive layer of the anode, when the organic light emitting diode device works, a voltage signal is provided for the transparent conductive layer, and the second electrode also obtains the voltage signal, so that a lead is not required to be arranged to provide the voltage signal for the second electrode, and the voltage signal is provided for the reflective layer, so that the voltage signal is not required to be provided for the first electrode, and therefore, the design difficulty of the voltage control circuit of the organic light emitting diode can be reduced, the structure of the voltage control circuit is simplified, and further, when the display product includes the organic light emitting diode device provided by the embodiment of the present application, the structure of the display.
In the organic light emitting diode device shown in fig. 1 provided in the embodiments of the present application, the first electrode and the second electrode of the liquid crystal cell may be transparent electrodes, for example, Indium Tin Oxide (ITO), and the transmissive layer of the OLED device may be a semi-transparent layer, for example.
Optionally, when the liquid crystal cell is disposed at the anode of the OLED device, the first electrode of the liquid crystal cell is the reflective layer, that is, the first electrode of the liquid crystal cell multiplexes the reflective layer of the anode, so that the structure of the OLED device can be simplified when a single white OLED device emits light of different colors as needed. As shown in fig. 2, the organic light emitting diode device provided in the embodiment of the present application includes a total reflection layer 2, an alignment layer 8, a liquid crystal layer 9, a second electrode 10, a transparent conductive layer 3, an organic light emitting layer 5, and a cathode 6.
Optionally, in a case that the liquid crystal cell is disposed at the anode of the OLED device, the second electrode of the liquid crystal cell is the transparent conductive layer, that is, the second electrode of the liquid crystal cell is multiplexed with the transparent conductive layer. As shown in fig. 3, the organic light emitting diode device provided in the embodiment of the present application includes a total reflection layer 2, an alignment layer 8, a liquid crystal layer 9, a transparent conductive layer 3, an organic light emitting layer 5, and a cathode 6. In the organic light emitting diode device shown in fig. 3 provided in the embodiment of the present application, the first electrode of the liquid crystal cell is multiplexed with the reflective layer of the anode, and the second electrode of the liquid crystal cell is multiplexed with the transparent conductive layer, so that the structure of the OLED can be further simplified.
Optionally, the second electrode of the liquid crystal cell is located between the transparent conductive layer and the reflective layer, and a first insulating layer is disposed between the second electrode and the transparent conductive layer. As shown in fig. 4, the first electrode of the liquid crystal cell multiplexes the reflective layer of the anode, and the organic light emitting diode device provided by the embodiment of the present application includes: the liquid crystal display device comprises a total reflection layer 2, an orientation layer 8, a liquid crystal layer 9, a second electrode 10, a first insulating layer 11, a transparent conducting layer 3, an organic light-emitting layer 5 and a cathode 6. In the organic light emitting diode device shown in fig. 4 provided in the embodiment of the present application, an insulating layer is disposed between the second electrode of the liquid crystal cell and the transparent electrode layer of the anode, so as to provide voltage for the second electrode and the transparent electrode layer respectively, that is, the voltage control circuit of the liquid crystal cell and the voltage control circuit driving the light emitting layer to emit light are separately disposed, and applying voltage to the liquid crystal cell does not affect the transparent electrode layer to provide a hole for the organic light emitting layer, so as not to affect the light emitting of the transparent electrode layer and the cathode driving light emitting layer.
Optionally, when the organic light emitting diode device is operated, the first electrode of the liquid crystal cell receives a first voltage signal, the first voltage signal is a fixed voltage, the second electrode of the liquid crystal cell receives a second voltage signal, and a deflection amplitude of liquid crystal in the liquid crystal cell changes along with a change of the second voltage signal. The first voltage signal is a fixed voltage, the second voltage signal is a variable voltage, that is, the voltage applied to the liquid crystal box changes with the change of the second voltage signal, the deflection amplitude of the liquid crystal in the liquid crystal box changes with the change of the second voltage signal, the refractive index of the liquid crystal changes with the change of the second voltage signal, the effective optical path of the optical microcavity of the OLED device changes with the change of the second voltage signal, and further the light-emitting color of the OLED device changes with the change of the second voltage signal.
Fig. 1 to 4 illustrate the organic light emitting diode device provided in the embodiments of the present application by taking the liquid crystal cell disposed at the anode as an example, and of course, the liquid crystal cell may be disposed at other positions of the organic light emitting diode device.
Optionally, the transmissive layer of the cathode includes a first transmissive layer and a second transmissive layer, the second transmissive layer is located on a side of the first transmissive layer away from the anode, and the liquid crystal cell is located between the first transmissive layer and the second transmissive layer, that is, the liquid crystal cell is disposed at the cathode. As shown in fig. 5, an organic light emitting diode device provided in an embodiment of the present application includes: the organic light emitting diode device comprises an anode 1, an organic light emitting layer 5 and a cathode 6, wherein the anode 1 comprises a reflecting layer 2 and a transparent conducting layer 3, the cathode 6 comprises a first transmission layer 12 and a second transmission layer 13, the organic light emitting diode device further comprises a liquid crystal box 4 positioned on the first transmission layer 12 and the second transmission layer 13, and the liquid crystal box 4 comprises a first electrode 7, an orientation layer 8, a liquid crystal layer 9 and a second electrode 10.
As shown in fig. 5, in the organic light emitting diode device, the first electrode and the second electrode of the liquid crystal cell are respectively in contact with the first transmissive layer and the second transmissive layer of the cathode, when the organic light emitting diode operates, the first transmissive layer is provided with a voltage signal, and the first electrode also obtains the voltage signal, so that it is not necessary to provide a lead for providing the voltage signal to the first electrode, and it is not necessary to provide the voltage signal to the second electrode for providing the voltage signal to the second transmissive layer, and thus the design difficulty of the voltage control circuit of the organic light emitting diode can be reduced, the structure of the voltage control circuit can be simplified, and when the display product includes the organic light emitting diode device provided in the embodiment of the present application, the structure of the display product can be simplified.
Optionally, the second electrode of the liquid crystal cell is the second transmissive layer. Namely, the second electrode of the liquid crystal box is multiplexed with the second transmission layer of the cathode, so that the structure of the OLED device can be simplified under the condition that a single OLED device emits light with different colors. As shown in fig. 6, an organic light emitting diode device provided in an embodiment of the present application includes: the liquid crystal display panel comprises a reflecting layer 2, a transparent conducting layer 3, an organic light-emitting layer 5, a first transmission layer 12, a first electrode 7, an orientation layer 8, a liquid crystal layer 9 and a second transmission layer 13.
Optionally, the first electrode of the liquid crystal cell is the first transmissive layer. I.e. the first electrode of the liquid crystal cell multiplexes the first transmissive layer of the cathode. As shown in fig. 7, an organic light emitting diode device provided in an embodiment of the present application includes: reflecting layer 2, transparent conducting layer 3, organic luminescent layer 5, first transmission layer 12, alignment layer 8, liquid crystal layer 9, second transmission layer 13. In the organic light emitting diode device shown in fig. 7 provided in the embodiment of the present application, the first electrode of the liquid crystal cell is multiplexed with the first transmissive layer of the cathode, and the second electrode is multiplexed with the second transmissive layer of the cathode, so that the structure of the organic light emitting diode device can be further simplified.
Optionally, the first electrode of the liquid crystal cell is located between the first transmissive layer and the second transmissive layer, and a second insulating layer is disposed between the first electrode and the first transmissive layer. As shown in fig. 8, an organic light emitting diode device provided in an embodiment of the present application includes: the liquid crystal display panel comprises a reflecting layer 2, a transparent conducting layer 3, an organic light-emitting layer 5, a first transmission layer 12, a second insulating layer 13, a first electrode 7, an orientation layer 8, a liquid crystal layer 9 and a second transmission layer 13. The organic light emitting diode device provided by the embodiment of the application is characterized in that the second insulating layer is arranged between the first electrode of the liquid crystal box and the first transmission layer of the cathode, so that voltage signals can be respectively provided for the first electrode of the liquid crystal box and the first transmission layer of the cathode, namely, the voltage control circuit of the liquid crystal box and the voltage control circuit for driving the light emitting layer to emit light are separately arranged, and thus, the voltage applied to the liquid crystal box cannot influence the first transmission layer to provide electrons for the organic light emitting layer, and the first transmission layer and the transparent electrode layer of the anode cannot be influenced to drive the organic light emitting layer to emit light.
Optionally, when the organic light emitting diode device is operated, the first electrode of the liquid crystal cell receives a third voltage signal, the third voltage signal is a fixed voltage, the second electrode of the liquid crystal cell receives a fourth voltage signal, and a deflection amplitude of liquid crystal in the liquid crystal cell changes with a change of the fourth voltage signal. The third voltage signal is a fixed voltage, the fourth voltage signal is a variable voltage, that is, the voltage applied to the liquid crystal box changes with the change of the fourth voltage signal, the deflection amplitude of the liquid crystal in the liquid crystal box changes with the change of the fourth voltage signal, the refractive index of the liquid crystal changes with the change of the fourth voltage signal, the effective optical path of the optical microcavity of the OLED device changes with the change of the fourth voltage signal, so that the light emitting color of the OLED device changes with the change of the fourth voltage signal, and for the white OLED device, that is, the white OLED device can emit light with different colors with the change of the fourth voltage signal, so that the fourth voltage signal can be adjusted as required, so that a single white OLED device can emit light with different colors as required.
As shown in fig. 9, a method for driving an organic light emitting diode display device according to an embodiment of the present application includes:
s901, determining the current required light color of the organic light-emitting diode device;
s902, providing voltage signals for the first electrode and the second electrode of the liquid crystal box according to the current required light color of the organic light emitting diode device, the preset corresponding relation between the light color of the organic light emitting diode device and the refractive index of the liquid crystal box and the preset relation between the refractive index of the liquid crystal box and the voltage signal for controlling the liquid crystal box, so that liquid crystal in the liquid crystal box deflects and the liquid crystal box has the refractive index corresponding to the current required light color of the organic light emitting diode device.
The organic light emitting diode device provided by the embodiment of the application is driven by the organic light emitting diode provided by the embodiment of the application, and the voltage applied to the liquid crystal box is changed, so that the refractive index of the liquid crystal box can be changed, the light emitting color of the organic light emitting diode device can be changed, especially for a white light OLED device, the voltage applied to the organic light emitting diode device can be changed as required, and the single white light organic light emitting diode device can emit light with different colors as required. Therefore, R, G, B sub-pixels do not need to be distinguished by arranging luminescent materials with different colors, and organic luminescent layers do not need to be arranged by adopting a plurality of mask plates, so that the yield of OLED devices can be prevented from being influenced, and the PPI of display products can be improved; for the white light OLED device, color filters with different colors are not required to be arranged to distinguish R, G, B sub-pixels, so that the reduction of light extraction efficiency, light color crosstalk and color group shielding caused by the use of the color filters can be avoided, the light extraction efficiency of a display product is improved, the display effect of the display product is improved, the PPI of the display product is improved, and the manufacturing cost of the display product can be reduced.
For a white light OLED device, when a liquid crystal box is arranged at the anode of the OLED device, a first voltage signal is received on a first electrode of the liquid crystal box, the first voltage signal is a fixed voltage, a second voltage signal is received on a second electrode of the liquid crystal box, and the second voltage signal is variable, the second voltage signal is changed according to the current required light color of the OLED device, the preset corresponding relation between the light color of the organic light emitting diode device and the refractive index of the liquid crystal box and the preset relation between the refractive index of the liquid crystal box and the voltage signal for controlling the liquid crystal box, so that liquid crystal in the liquid crystal box is deflected, and the liquid crystal box has the refractive index corresponding to the current required light color of the white light organic light emitting diode device.
For a white light OLED device, when a liquid crystal box is arranged at the cathode of the OLED device, a first electrode of the liquid crystal box receives a third voltage signal, the third voltage signal is a fixed voltage, a second electrode of the liquid crystal box receives a fourth voltage signal, and the fourth voltage signal is variable, the fourth voltage signal is changed according to the current required light color of the OLED device, the preset corresponding relation between the light color of the organic light emitting diode device and the refractive index of the liquid crystal box, and the preset relation between the refractive index of the liquid crystal box and the voltage signal for controlling the liquid crystal box, so that liquid crystal in the liquid crystal box is deflected, and the liquid crystal box has the refractive index corresponding to the current required light color of the white light organic light emitting diode device.
The embodiment of the application also provides a display panel, which comprises the organic light-emitting diode device provided by the embodiment of the application.
Optionally, the display panel provided in the embodiment of the present application further includes a voltage control circuit for providing a voltage signal to the liquid crystal cell. The voltage control circuit provides a voltage signal to the liquid crystal box, and the driving method of the organic light emitting diode display device provided by the embodiment of the application can be adopted.
Taking the display panel including the organic light emitting diode device shown in fig. 4 as an example, the display panel provided in the embodiment of the present application includes, as shown in fig. 10, an organic light emitting diode device 15 and a voltage control circuit, where the voltage control circuit is connected to the reflective layer 2 and the second electrode 10 in the light emitting diode device 15.
When the liquid crystal box is arranged at the anode, the voltage control circuit provides a first voltage signal for the first electrode of the liquid crystal box and provides a second voltage signal for the second electrode, the first voltage signal is a fixed voltage, and the second voltage signal is variable. When the liquid crystal box is arranged on the cathode, the voltage control circuit provides a third voltage signal for the first electrode of the liquid crystal box and provides a fourth voltage signal for the second electrode, wherein the third voltage signal is a fixed voltage, and the fourth voltage signal is variable.
The embodiment of the application also provides a display device which comprises the display panel provided by the embodiment of the application.
The display device provided by the embodiment of the application can be a mobile phone, a computer, a television and the like.
To sum up, in the organic light emitting diode device and the driving method thereof, the display panel, and the display device provided in the embodiments of the present application, the liquid crystal cell is disposed between the reflective layer and the transmissive layer, and liquid crystal in the liquid crystal cell deflects under the action of a voltage between the first electrode and the second electrode. For the white light OLED device, with the change of the refractive index, the red light, the green light and the blue light in the white light can be separated, so that the white light OLED device can emit colored light by adjusting the refractive index of the white light OLED device, for example, the red light, the green light or the blue light can be emitted, namely, a single white light OLED device can emit light with different colors according to the requirement. Therefore, R, G, B sub-pixels do not need to be distinguished by arranging luminescent materials with different colors, and organic luminescent layers do not need to be arranged by adopting a plurality of mask plates, so that the yield of OLED devices can be prevented from being influenced, and the PPI of display products can be improved; for a white light OLED display product, color filters with different colors are not required to be arranged to distinguish RGB sub-pixels, so that reduction of light extraction efficiency, light color crosstalk and color group shielding caused by the use of the color filters can be avoided, further, the light extraction efficiency of the display product is improved, the display effect of the display product is improved, the PPI of the display product is improved, and the manufacturing cost of the display product can be reduced.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (5)
1. An organic light emitting diode device, comprising:
a cathode and an anode, and an organic light emitting layer between the cathode and the anode, wherein the anode comprises a reflective layer, the cathode comprises a transmissive layer, and light emitted by the organic light emitting diode device exits the cathode side;
a liquid crystal cell positioned between the reflective layer and the transmissive layer, the liquid crystal cell including a first electrode and a second electrode, liquid crystal in the liquid crystal cell being deflected by a voltage between the first electrode and the second electrode;
the transmission layer of the cathode comprises a first transmission layer and a second transmission layer, the second transmission layer is positioned on one side of the first transmission layer far away from the anode, the liquid crystal box is positioned between the first transmission layer and the second transmission layer, the first electrode of the liquid crystal box is the first transmission layer, and the second electrode of the liquid crystal box is the second transmission layer;
when the organic light emitting diode device works, the first electrode of the liquid crystal box receives a third voltage signal, the third voltage signal is a fixed voltage, the second electrode of the liquid crystal box receives a fourth voltage signal, and the deflection amplitude of liquid crystal in the liquid crystal box changes along with the change of the fourth voltage signal;
the liquid crystal cell is configured to: after the current required light color of the organic light emitting diode device is determined, providing voltage signals for the first electrode and the second electrode of the liquid crystal box according to the current required light color of the organic light emitting diode device, a preset corresponding relation between the light color of the organic light emitting diode device and the refractive index of the liquid crystal box and a preset relation between the refractive index of the liquid crystal box and a voltage signal for controlling the liquid crystal box, so that liquid crystal in the liquid crystal box is deflected, and the liquid crystal box has the refractive index corresponding to the current required light color of the organic light emitting diode device;
the liquid crystal cell further comprises an alignment layer between the liquid crystal and the first electrode or between the liquid crystal and the second electrode;
the organic light emitting layer emits white light.
2. A method of driving the organic light emitting diode device according to claim 1, comprising:
determining the current required light emitting color of the organic light emitting diode device;
providing voltage signals for the first electrode and the second electrode of the liquid crystal box according to the current required light color of the organic light emitting diode device, the preset corresponding relation between the light color of the organic light emitting diode device and the refractive index of the liquid crystal box and the preset relation between the refractive index of the liquid crystal box and the voltage signal for controlling the liquid crystal box, so that liquid crystal in the liquid crystal box deflects, and the liquid crystal box has the refractive index corresponding to the current required light color of the organic light emitting diode device.
3. A display panel comprising the organic light emitting diode device according to claim 1.
4. The display panel of claim 3, further comprising a voltage control circuit that provides a voltage signal to the liquid crystal cells.
5. A display device characterized by comprising the display panel according to claim 3 or 4.
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