CN115207240B - Light emitting device, display panel and display device - Google Patents
Light emitting device, display panel and display device Download PDFInfo
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- CN115207240B CN115207240B CN202210780269.0A CN202210780269A CN115207240B CN 115207240 B CN115207240 B CN 115207240B CN 202210780269 A CN202210780269 A CN 202210780269A CN 115207240 B CN115207240 B CN 115207240B
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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
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
- H10K50/125—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light
- H10K50/13—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light comprising stacked EL layers within one EL unit
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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
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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
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/068—Adjustment of display parameters for control of viewing angle adjustment
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- Optics & Photonics (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
The invention provides a light emitting device, a display panel and a display device; the light-emitting device comprises an anode, a first light-emitting layer arranged above the anode, a second light-emitting layer arranged above the first light-emitting layer and a cathode arranged above the second light-emitting layer, wherein when the light-emitting device is in a sharing display mode, the first light-emitting layer emits light, and the light-emitting device has a first visual angle range; when the light-emitting device is in the peep-proof display mode, the second light-emitting layer emits light, and the light-emitting device has a second visual angle range; the first viewing angle range is greater than the second viewing angle range. According to the embodiment of the invention, the double light-emitting layers are adopted, and the light-emitting positions are controlled by utilizing different driving voltages, so that the switching of the size view angle range is realized, and the switching effect of the sharing display mode and the peeping prevention display mode is further realized; based on this, the display device does not need additional peep-proof components, and equipment cost is reduced.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a light emitting device, a display panel, and a display apparatus.
Background
Organic light-emitting diodes (OLEDs) attract the eyes of a plurality of display manufacturers worldwide due to the advantages of self-luminescence, wide working temperature range, fast response speed, wide viewing angle, high luminous efficiency, capability of being manufactured on a flexible substrate, low driving voltage and energy consumption and the like, and are known as the next-generation display technology.
With the continuous development of science and technology, the production technology of display panels is mature, the viewing angle is wider, people can watch clear pictures from different angles, but when the pictures relate to personal privacy or business secrets, the protection of privacy is a problem that people have to face. The visual angle switching technology can meet the protection of personal privacy and business secrets to a great extent, when privacy protection is needed, the visual angle switching technology is switched to narrow visual angle display, and displayed contents cannot be seen out of a certain range, so that the peep-proof effect is realized.
At present, an additional peep-proof component is added in the display device to realize the peep-proof effect, so that the thickness of the display device is thicker, and the cost is higher.
Therefore, the existing display device has the technical problem that an additional peep-proof component needs to be added to achieve the peep-proof effect, and needs to be improved.
Disclosure of Invention
The invention provides a light-emitting device, a display panel and a display device, which are used for solving the technical problem that an additional peep-proof component is required to be added to achieve the peep-proof effect in the existing display panel.
In order to solve the problems, the technical scheme provided by the invention is as follows:
an embodiment of the present invention provides a light emitting device including:
an anode;
the first light-emitting layer is arranged above the anode;
the second light-emitting layer is arranged above the first light-emitting layer;
a cathode disposed above the second light emitting layer;
when the light emitting device is in a sharing display mode, the first light emitting layer emits light, and the light emitting device has a first visual angle range; when the light-emitting device is in the peep-proof display mode, the second light-emitting layer emits light, and the light-emitting device has a second visual angle range; the first viewing angle range is greater than the second viewing angle range.
In the light emitting device provided by the embodiment of the invention, the light emitting spectrum of the first light emitting layer is different from the light emitting spectrum of the second light emitting layer.
Further, an embodiment of the present invention further provides a display panel, including a plurality of sub-pixels, at least one of the sub-pixels including a light emitting device, the light emitting device including:
an anode;
the first light-emitting layer is arranged above the anode;
the second light-emitting layer is arranged above the first light-emitting layer;
a cathode disposed above the second light emitting layer;
when the display panel is in a sharing display mode, the first light-emitting layer emits light, and the display panel has a first visual angle range; when the display panel is in the peep-proof display mode, the second light-emitting layer emits light, and the display panel has a second visual angle range; the first viewing angle range is greater than the second viewing angle range.
In the display panel provided by the embodiment of the invention, the light-emitting spectrum of the first light-emitting layer is different from the light-emitting spectrum of the second light-emitting layer.
In the display panel provided by the embodiment of the invention, at least one sub-pixel further includes a light functional portion located above the light emitting device, wherein the overlapping degree of the light emitting spectrum of the first light emitting layer and the transmission spectrum of the light functional portion is greater than the overlapping degree of the light emitting spectrum of the second light emitting layer and the transmission spectrum of the light functional portion.
In the display panel provided by the embodiment of the invention, the light functional part is a color resistor.
In the display panel provided by the embodiment of the invention, under a plurality of different viewing angles, the peak wavelength of the light emitting spectrum of the first light emitting layer is located at a first side of the peak wavelength of the transmission spectrum of the light functional portion, and the peak wavelength of the light emitting spectrum of the second light emitting layer is located at a second side of the peak wavelength of the transmission spectrum of the light functional portion.
In the display panel provided by the embodiment of the invention, when the voltage difference loaded by the anode and the cathode is lower than the threshold voltage, the first light-emitting layer emits light; the second light emitting layer emits light when a voltage difference applied to the anode and the cathode is higher than the threshold voltage.
In the display panel provided by the embodiment of the invention, when the same gray scale is displayed, the light emitting time of the first light emitting layer is longer than the light emitting time of the second light emitting layer.
Still further, an embodiment of the present invention further provides a display device, including a driving chip and a display panel as described in the above embodiment; the driving chip is used for driving the display panel to work according to the determined display mode; the display modes comprise a sharing display mode and a peeping-proof display mode.
The beneficial effects of the invention are as follows: the invention provides a light emitting device, a display panel and a display device; the light-emitting device comprises an anode, a first light-emitting layer arranged above the anode, a second light-emitting layer arranged above the first light-emitting layer and a cathode arranged above the second light-emitting layer, wherein when the light-emitting device is in a sharing display mode, the first light-emitting layer emits light, and the light-emitting device has a first visual angle range; when the light-emitting device is in the peep-proof display mode, the second light-emitting layer emits light, and the light-emitting device has a second visual angle range; the first viewing angle range is greater than the second viewing angle range. According to the embodiment of the invention, the double light-emitting layers are adopted, and the light-emitting positions are controlled by utilizing different driving voltages, so that the switching of the range of the large and small viewing angles is realized, and the switching effect of the sharing mode and the peeping-preventing display mode is further achieved; based on this, the display device does not need additional peep-proof components, and equipment cost is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic cross-sectional structure of a light emitting device according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional structure of a display panel according to an embodiment of the present invention;
fig. 3 is an overlapping comparison situation of a light emission spectrum of a first light emitting layer and a color film (light functional part) transmission spectrum under different viewing angles according to an embodiment of the present invention;
fig. 4 is an overlapping comparison situation of a light emission spectrum of the second light emitting layer and a transmission spectrum of the color film (light functional part) under different viewing angles according to the embodiment of the present invention;
FIG. 5 is a graph showing the attenuation mapping relationship between the luminance of the first light-emitting layer and the second light-emitting layer and the angle of view according to the embodiment of the present invention;
FIG. 6 is a graph showing the change of hole mobility and electron mobility with increasing voltage according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a pixel lighting time required when the first light emitting layer emits light according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a pixel lighting time required when the second light emitting layer emits light according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In this application, the term "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the invention. In the following description, details are set forth for purposes of explanation. It will be apparent to one of ordinary skill in the art that the present invention may be practiced without these specific details. In other instances, well-known structures and processes have not been described in detail so as not to obscure the description of the invention with unnecessary detail. Thus, the present invention is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.
Aiming at the technical problem that an additional peep-proof component is needed to be added to realize the peep-proof effect of the existing display panel, the embodiment of the invention can be solved.
In order to solve the above problems, the present application provides a light emitting device, specifically, the light emitting device provided by the present application includes an anode, a first light emitting layer disposed above the anode, a second light emitting layer disposed above the first light emitting layer, and a cathode disposed above the second light emitting layer, wherein when the light emitting device is in a sharing display mode, the first light emitting layer emits light, and the light emitting device has a first viewing angle range; when the light-emitting device is in the peep-proof display mode, the second light-emitting layer emits light, and the light-emitting device has a second visual angle range; the first viewing angle range is greater than the second viewing angle range.
The light emitting device provided in the present application is explained in detail by specific embodiments below.
In an embodiment, referring to fig. 1, fig. 1 is a schematic cross-sectional structure of a light emitting device according to an embodiment of the invention. As shown in fig. 1, a light emitting device 100 provided in an embodiment of the present invention includes:
an Anode (Anode) 10;
a first light emitting layer (EML-1) 14 disposed above the anode 10;
a second light emitting layer (EML-2) 15 disposed above the first light emitting layer 14;
a Cathode (Cathode) 19 disposed above the second light-emitting layer 15;
wherein the first light emitting layer 14 emits light when the light emitting device 100 is in the sharing display mode, the light emitting device 100 having a first viewing angle range; the second light emitting layer 15 emits light when the light emitting device is in the peep-proof display mode, and the light emitting device 100 has a second viewing angle range; the first viewing angle range is greater than the second viewing angle range.
Namely, the invention provides a light emitting device, a display panel and a display device; the light-emitting device comprises an anode, a first light-emitting layer arranged above the anode, a second light-emitting layer arranged above the first light-emitting layer and a cathode arranged above the second light-emitting layer, wherein when the light-emitting device is in a sharing display mode, the first light-emitting layer emits light, and the light-emitting device has a first visual angle range; when the light-emitting device is in the peep-proof display mode, the second light-emitting layer emits light, and the light-emitting device has a second visual angle range; the first viewing angle range is greater than the second viewing angle range. According to the embodiment of the invention, the double light-emitting layers are adopted, and the light-emitting positions are controlled by utilizing different driving voltages, so that the switching of the range of the large and small viewing angles is realized, and the switching effect of the sharing mode and the peeping-preventing display mode is further achieved; based on this, the display device does not need additional peep-proof components, and equipment cost is reduced.
In addition, as shown in fig. 1, the light emitting device 100 provided in the embodiment of the present invention further includes a Hole Injection Layer (HIL) 11, a Hole Transport Layer (HTL) 12, an electron blocking layer (FL) 13, a hole blocking layer (EICL) 16, an Electron Transport Layer (ETL) 17, an Electron Injection Layer (EIL) 18, and a light extraction layer (CPL) 20, wherein the hole transport layer is an aromatic heterocycle having an electron donating ability; the electron blocking layer has a structure similar to that of the hole transport layer, and HOMO (highest occupied molecular orbital) energy levels of materials (FLR or FLG or FLB) for devices of different colors (RGB) are different; the electron transport layer is an aromatic heterocycle with electron pulling capability; the hole blocking layer is similar to the electron transport layer in structure; the electron injection layer is typically ytterbium metal; the light extraction layer has a similar structure to the hole transport layer, but has better planarity, high refractive index and can increase the coupling-out light efficiency.
In one embodiment, the light emission spectrum of the first light emitting layer 14 is different from the light emission spectrum of the second light emitting layer 15. Specifically, the first light-emitting layer 14 contains the light-emitting material 1 (Dopant 1), the second light-emitting layer 15 contains the light-emitting material 2 (Dopant 2), and the light-emitting spectra of the light-emitting material 1 and the light-emitting material 2 are different from each other, so that the light-emitting spectrum of the first light-emitting layer 14 is different from the light-emitting spectrum of the second light-emitting layer 15.
Further, referring to fig. 1 and 2, in an embodiment of the present application, a display panel 200 is further provided, as shown in fig. 2, the display panel 200 includes a plurality of sub-pixels 24, at least one of the sub-pixels 24 includes a light emitting device 100, as shown in fig. 1, the light emitting device 100 includes:
an anode 10;
a first light-emitting layer 14 disposed above the anode 10;
a second light-emitting layer 15 disposed above the first light-emitting layer 14;
a cathode 19 disposed above the second light-emitting layer 15;
wherein, when the display panel 200 is in the sharing display mode, the first light emitting layer 14 emits light, and the display panel 200 has a first viewing angle range; when the display panel 200 is in the peep-proof display mode, the second light-emitting layer 15 emits light, and the display panel 200 has a second viewing angle range; the first viewing angle range is greater than the second viewing angle range.
In one embodiment, the light emission spectrum of the first light emitting layer 14 is different from the light emission spectrum of the second light emitting layer 15. Specifically, the light emitting materials contained in the first light emitting layer 14 and the second light emitting layer 15 are different, the light emitting material 1 is contained in the first light emitting layer 14, the light emitting material 2 is contained in the second light emitting layer 15, and the light emitting spectra of the light emitting material 1 and the light emitting material 2 are different to a certain extent, so that the light emitting spectra of the first light emitting layer 14 and the second light emitting layer 15 are different.
In one embodiment, as shown in fig. 2, at least one of the sub-pixels further includes a light functional portion 26 located above the light emitting device 100, wherein a degree of overlapping of the light emission spectrum of the first light emitting layer 14 and the light functional portion is greater than a degree of overlapping of the light emission spectrum of the second light emitting layer 15 and the light functional portion.
In the present embodiment, the light functional unit 26 refers to a color filter, i.e., a color film, located above the touch film layer 25 of the display panel.
Specifically, the electroluminescent spectrum of the luminescent material 1 in the first luminescent layer 14 and the electroluminescent spectrum of the luminescent material 2 in the second luminescent layer 15 are different from the transmission spectrum of the color filter, the electroluminescent spectrum of the luminescent material 1 is overlapped with the transmission spectrum of the color filter to a greater extent, and the electroluminescent spectrum of the luminescent material 2 is overlapped with the transmission spectrum of the color filter to a lesser extent, so that when a voltage is applied, the first luminescent layer 14 emits light, the display panel is in a sharing display mode, and when the second luminescent layer 15 emits light, the display panel is in an anti-peeping display mode.
In one embodiment, the light functional portion 26 is a color resistor. Specifically, in the present embodiment, the light functional unit 26 refers to a color filter, that is, a color film; the color filter comprises a plurality of filter patterns and shading patterns arranged among the filter patterns, wherein the filter patterns comprise red color resistors, green color resistors and blue color resistors, and the shading patterns are black color resistors.
In addition, the display panel 200 further includes a substrate 21, an array substrate 22 disposed above the substrate 21, a light emitting device layer 23 disposed above the array substrate 22, a glue layer 27 disposed above the light functional portion 26, and a cover plate 28 disposed above the glue layer 27.
In one embodiment, referring to fig. 3, 4 and 5, at a plurality of different viewing angles, the peak wavelength of the light emission spectrum of the first light emitting layer 14 is located at a first side of the peak wavelength of the transmission spectrum of the light functional portion 26, and the peak wavelength of the light emission spectrum of the second light emitting layer 15 is located at a second side of the peak wavelength of the transmission spectrum of the light functional portion 26.
Specifically, as shown in fig. 3, fig. 3 is a case of overlapping and comparing the light emission spectrum of the first light emitting layer 14 at different viewing angles with the transmission spectrum of the color film (the light functional portion 26). In fig. 3, the vertical axis represents the spectral intensity, and for the first light-emitting layer 14, the relative light-emitting intensity of the electroluminescence spectrum of 0 to 60 degrees is represented, and for the color filter, the intensity of the transmission spectrum is represented, that is, the transmittance at different wavelengths can be understood; the horizontal axis in fig. 3 represents wavelength. As can be seen from the figure, when the viewing angles are 0 degrees, 30 degrees, 45 degrees and 60 degrees, the peak wavelength of the light emission spectrum of the first light emitting layer 14 is located at the right side of the peak wavelength of the transmission spectrum of the color filter, the electroluminescent spectrum of the first light emitting layer 14 overlaps the transmission spectrum of the color filter to a relatively large extent, and is on the right side of the transmission spectrum peak, in this case, as shown in fig. 5, the luminance of the display panel is attenuated slowly with the increase of the viewing angle, and is in the sharing mode.
Accordingly, fig. 4 shows the overlapping comparison of the light emission spectrum of the second light emitting layer 15 and the transmission spectrum of the color film (the light functional part) (the number relationship represented by the vertical and horizontal axes is the same as that of fig. 3), as shown in fig. 4, when the viewing angles are 0 degrees, 30 degrees, 45 degrees and 60 degrees, the peak wavelength of the light emission spectrum of the second light emitting layer 15 is located at the left side of the peak wavelength of the transmission spectrum of the color filter, the overlapping degree of the light emission spectrum of the second light emitting layer 15 and the transmission spectrum of the color filter is smaller, and is the left side of the peak of the transmission spectrum, in this case, as shown in fig. 5, the luminance of the display panel decays faster with the increase of the viewing angle, and is the anti-peeping mode.
Fig. 5 shows an attenuation mapping relationship between the luminance of the excitation light and the viewing angle of the first light emitting layer 14 and the second light emitting layer 15; as can be seen from the figure, the luminance of the first light-emitting layer 14 decays slowly with increasing viewing angle from 0 degrees to 60 degrees, and the luminance of the second light-emitting layer 15 decays rapidly with increasing viewing angle, so that the display panel is in the sharing display mode when the first light-emitting layer 14 emits light, and is in the peeping-preventing display mode when the second light-emitting layer 15 emits light.
In one embodiment, the first light emitting layer 14 emits light when the voltage difference across the anode 10 and the cathode 19 is below a threshold voltage; when the voltage difference applied to the anode 10 and the cathode 19 is higher than the threshold voltage, the second light emitting layer 15 emits light.
It should be noted that, as shown in fig. 6, in the OLED device, the change condition of the hole mobility and the electron mobility with the increase of the voltage is different, and the applied voltage is changed, so that the exciton recombination region in the light emitting device can be adjusted, for example, when the applied voltage is smaller than the threshold voltage, the electron transport speed is faster than the hole transport speed, the exciton is recombined in the first light emitting layer 14, the first light emitting layer 14 emits light, the luminance of the display panel decays slowly, and the normal light emitting mode, that is, the sharing display mode, is adopted; when the applied voltage is greater than the threshold voltage, the hole transport speed is faster than the electron transport speed, excitons recombine in the second light-emitting layer 15, the second light-emitting layer 15 emits light, the brightness of the display panel decays fast, the brightness of the large viewing angle is low, and the display content is invisible, so that the display mode is an anti-peeping display mode.
Specifically, in this embodiment, the threshold voltage is 2.4 v, that is, when the voltage difference between the anode 10 and the cathode 19 is less than 2.4 v, the electron transport speed is faster than the hole transport speed, excitons recombine in the first light-emitting layer 14, and the first light-emitting layer 14 emits light, and is in the sharing display mode at this time; when the voltage difference between the anode 10 and the cathode 19 is higher than 2.4 v, the hole transmission speed is faster than the electron transmission speed, excitons are recombined in the second light-emitting layer 15, and the second light-emitting layer 15 emits light, which is a peeping-proof display mode.
In one embodiment, the light emitting period of the first light emitting layer 14 is longer than the light emitting period of the second light emitting layer 15 when the same gray scale is displayed. Specifically, since the brightness of the light emitted by the display panel is different under different voltages, in order to realize different gray scale display, a global dimming mode (Pulse Width Modulation, PWM) may be adopted, and when the first light emitting layer 14 emits light, as shown in fig. 7, the required voltage is lower, the brightness is relatively lower, and at this time, the pixel lighting time is required to be longer; when the second light emitting layer 15 emits light, as shown in fig. 8, since the required voltage is high, the luminance is relatively high, and the pixel lighting time is required to be shortened; therefore, the pixel lighting time is determined according to the relative brightness of the first light-emitting layer 14 or the second light-emitting layer 15; when the sharing display mode or the peeping-proof display mode is adopted to realize the same gray scale and the same brightness, the light emitting time of the first light emitting layer 14 is longer than the light emitting time of the second light emitting layer 15.
Correspondingly, the embodiment of the application also provides a display device, which comprises a driving chip and the display panel 200 described in the embodiment above; the driving chip is used for driving the display panel 200 to work according to the determined display mode; the display modes comprise a sharing display mode and a peeping-proof display mode.
Specifically, in practical application, the display device may be an electronic terminal with a display function, such as a fixed terminal of a desktop computer, a television, or a mobile terminal of a smart phone, a tablet computer, or the like.
As can be seen from the above embodiments:
the invention provides a light emitting device, a display panel and a display device; the light-emitting device comprises an anode, a first light-emitting layer arranged above the anode, a second light-emitting layer arranged above the first light-emitting layer and a cathode arranged above the second light-emitting layer, wherein when the light-emitting device is in a sharing display mode, the first light-emitting layer emits light, and the light-emitting device has a first visual angle range; when the light-emitting device is in the peep-proof display mode, the second light-emitting layer emits light, and the light-emitting device has a second visual angle range; the first viewing angle range is greater than the second viewing angle range. According to the embodiment of the invention, the double light-emitting layers are adopted, and the light-emitting positions are controlled by utilizing different driving voltages, so that the switching of the range of the large and small viewing angles is realized, and the switching effect of the sharing mode and the peeping-preventing display mode is further achieved; based on this, the display device does not need additional peep-proof components, and equipment cost is reduced.
In summary, although the present invention has been described in terms of the preferred embodiments, the preferred embodiments are not limited to the above embodiments, and various modifications and changes can be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention is defined by the appended claims.
Claims (9)
1. A light emitting device, comprising:
an anode;
the first light-emitting layer is arranged above the anode;
the second light-emitting layer is arranged above the first light-emitting layer;
a cathode disposed above the second light emitting layer;
when the light emitting device is in a sharing display mode, the first light emitting layer emits light, and the light emitting device has a first visual angle range; when the light-emitting device is in the peep-proof display mode, the second light-emitting layer emits light, and the light-emitting device has a second visual angle range; the first viewing angle range is greater than the second viewing angle range; the peak wavelength of the light emission spectrum of the first light emitting layer is located at a first side of the peak wavelength of the transmission spectrum of the light functional portion, the peak wavelength of the light emission spectrum of the second light emitting layer is located at a second side of the peak wavelength of the transmission spectrum of the light functional portion, and the light functional portion is located above the light emitting device.
2. The light-emitting device according to claim 1, wherein an emission spectrum of the first light-emitting layer is different from an emission spectrum of the second light-emitting layer.
3. A display panel comprising a plurality of sub-pixels, at least one of said sub-pixels comprising a light emitting device, said light emitting device comprising:
an anode;
the first light-emitting layer is arranged above the anode;
the second light-emitting layer is arranged above the first light-emitting layer;
a cathode disposed above the second light emitting layer;
when the display panel is in a sharing display mode, the first light-emitting layer emits light, and the display panel has a first visual angle range; when the display panel is in the peep-proof display mode, the second light-emitting layer emits light, and the display panel has a second visual angle range; the first viewing angle range is greater than the second viewing angle range;
at least one of the sub-pixels further comprises a light functional part positioned above the light emitting device, the peak wavelength of the light emitting spectrum of the first light emitting layer is positioned at a first side of the peak wavelength of the transmission spectrum of the light functional part, and the peak wavelength of the light emitting spectrum of the second light emitting layer is positioned at a second side of the peak wavelength of the transmission spectrum of the light functional part under a plurality of different viewing angles.
4. A display panel according to claim 3, wherein the light emission spectrum of the first light emitting layer is different from the light emission spectrum of the second light emitting layer.
5. The display panel according to claim 4, wherein a degree of overlap between the light emission spectrum of the first light-emitting layer and the transmission spectrum of the light-functional portion is larger than a degree of overlap between the light emission spectrum of the second light-emitting layer and the transmission spectrum of the light-functional portion.
6. The display panel of claim 5, wherein the light functional portion is a color resistor.
7. The display panel according to any one of claims 3 to 6, wherein the first light-emitting layer emits light when a voltage difference applied to the anode and the cathode is lower than a threshold voltage; the second light emitting layer emits light when a voltage difference applied to the anode and the cathode is higher than the threshold voltage.
8. The display panel according to claim 7, wherein a light emission time period of the first light emitting layer is longer than a light emission time period of the second light emitting layer when the same gray scale is displayed.
9. A display device comprising a driving chip and the display panel according to any one of claims 3 to 8; the driving chip is used for driving the display panel to work according to the determined display mode; the display modes comprise a sharing display mode and a peeping-proof display mode.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TW200533227A (en) * | 2004-03-31 | 2005-10-01 | Fujitsu Ltd | Organic electroluminescent device and organic electroluminescent display |
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| JP2006023398A (en) * | 2004-07-06 | 2006-01-26 | Toshiba Matsushita Display Technology Co Ltd | Electroluminescence display apparatus |
| CN101562234A (en) * | 2009-04-13 | 2009-10-21 | 信利半导体有限公司 | Organic electroluminescent display element |
| JP2020129055A (en) * | 2019-02-08 | 2020-08-27 | 日東電工株式会社 | View angle control film, backlight unit, and liquid crystal display device |
| CN110752307B (en) * | 2019-10-31 | 2022-11-15 | 昆山国显光电有限公司 | Light emitting device and display panel |
| CN114447073A (en) * | 2022-01-24 | 2022-05-06 | 深圳市华星光电半导体显示技术有限公司 | Display panel and mobile terminal |
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| TW200533227A (en) * | 2004-03-31 | 2005-10-01 | Fujitsu Ltd | Organic electroluminescent device and organic electroluminescent display |
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