CN108448007B - Organic light emitting display panel and display device thereof - Google Patents
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Abstract
The embodiment of the invention provides an organic light-emitting display panel and a display device thereof, relates to the technical field of display, and is used for improving the phenomenon of large-viewing-angle color cast. Wherein the organic light emitting display panel includes: the pixel structure comprises a plurality of sub-pixel units distributed in an array, wherein each sub-pixel unit at least comprises a first area and a second area; the first region has a first microcavity structure, the second region has a second microcavity structure, wherein, the wavelength of the maximum luminous peak of the first microcavity structure emergent light is greater than the wavelength of the maximum luminous peak of the second microcavity structure emergent light. The organic light emitting display panel is suitable for a display device.
Description
Technical Field
The invention relates to the technical field of display, in particular to an organic light-emitting display panel and a display device thereof.
Background
The most information-receiving sense organs of human beings are the visual organs (eyes), and people are increasingly required to utilize abundant visual information in production and life, so that display technology plays a very important role in the human society today. Display technology is emerging from the present, the technology development is also very rapid, and with the development of society and the continuous improvement of human demand for living of materials, the current display technology is rapidly advancing towards high contrast, high resolution, full-color display, low power consumption, high reliability, long service life and thinness and lightness.
Among them, the Organic Light-Emitting Diode (OLED) display device has the advantages of self-luminescence, fast response speed, wide viewing angle, high definition, high brightness, strong bending resistance, low power consumption, etc., and is gradually becoming a powerful competitor of the liquid crystal display panel, and is known as the next generation of illusive display technology.
The problem of relatively serious color cast under a large viewing angle is that the problem is ubiquitous and needs to be solved in the OLED display device.
Disclosure of Invention
In view of the foregoing, the present invention provides an organic light emitting display panel and a display device thereof, which are used for improving color shift at a large viewing angle.
In a first aspect, the present invention provides an organic light emitting display panel including: the pixel structure comprises a plurality of sub-pixel units distributed in an array, wherein each sub-pixel unit at least comprises a first area and a second area;
the first region has a first microcavity structure, the second region has a second microcavity structure, wherein, the wavelength of the maximum luminous peak of the first microcavity structure emergent light is greater than the wavelength of the maximum luminous peak of the second microcavity structure emergent light.
In a second aspect, the present invention provides a display device including the organic light emitting display panel according to the first aspect of the present invention.
Any one of the above technical solutions has the following beneficial effects:
in this embodiment, the wavelength of the maximum emission peak of the light emitted from the first microcavity structure in the first region is adjusted to be longer than the wavelength of the maximum emission peak of the light emitted from the second microcavity structure in the second region, that is, the wavelength of the intrinsic peak of the light emission color in the first region in the sub-pixel unit is longer than the wavelength of the intrinsic peak of the light emission color in the second region in the sub-pixel unit. Since the resonant wavelength of the light emitted from the microcavity structure is inversely proportional to the viewing angle, after the light is emitted from a large viewing angle, although the viewing angle is increased, the wavelength of the intrinsic peak of the light color is increased, so that the resonant wavelength of the light emitted from the large viewing angle or an oblique viewing angle is compensated, the resonant wavelength of the light emitted from the large viewing angle or the oblique viewing angle is close to the resonant wavelength of the light emitted from the normal viewing angle or the small viewing angle, and the viewing angle color cast phenomenon of the light emitted from the large viewing angle or the oblique viewing angle is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an organic light emitting display panel according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an organic light emitting display panel according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an organic light emitting display panel according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an organic light emitting display panel according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an organic light emitting display panel according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an organic light emitting display panel according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an organic light emitting display panel according to an embodiment of the invention;
fig. 8 is a schematic structural diagram of an organic light emitting display panel according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of an organic light emitting display panel according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of an organic light emitting display panel according to an embodiment of the invention;
fig. 11 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present 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 terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, etc. may be used herein to describe regions in embodiments of the present invention, these regions should not be limited by these terms. These terms are only used to distinguish one region from another. For example, a first region may also be referred to as a second region, and similarly, a second region may also be referred to as a first region, without departing from the scope of embodiments of the present invention.
It should be noted that the terms "upper", "lower", "left", "right", and the like used in the description of the embodiments of the present invention are used in the angle shown in the drawings, and should not be construed as limiting the embodiments of the present invention. In addition, in this context, it is also to be understood that when an element is referred to as being "on" or "under" another element, it can be directly formed on "or" under "the other element or be indirectly formed on" or "under" the other element through an intermediate element.
Before the present embodiment is described in detail, the structure of the organic light emitting display panel will be briefly described:
as shown in fig. 1, a schematic structural diagram of an organic light emitting display panel according to an embodiment of the present invention is provided, where the organic light emitting display panel 1 includes a first substrate 10, a plurality of organic light emitting devices 11 disposed on a side surface of the first substrate 10, each organic light emitting device 11 includes a first electrode 12, a second electrode 14, and an organic functional layer 13 disposed between the first electrode 12 and the second electrode 14, the first electrode 12 is in contact with a side surface of the first substrate 10, and the second electrode 14 is located on a side surface of the organic functional layer 13 facing away from the first substrate 10. It should be noted that the first electrode 12 and the second electrode 14 are both common film layers, and thus the first electrode 12 and the second electrode 14 in fig. 1 are both one integral film layer.
It is understood that the first substrate 10 in this embodiment may be a flexible substrate, and the corresponding organic light emitting display panel 1 may be a flexible organic light emitting display panel, and the flexible organic light emitting display panel has special effects of low power consumption and being bendable, and is suitable for various display devices, especially for wearable display devices. Optionally, the flexible substrate is made of polyester imide or polyethylene terephthalate resin. In addition, the first substrate 10 may also be a rigid substrate, and the corresponding organic light emitting display panel 1 is a rigid organic light emitting display panel. In fact, the material of the organic light emitting display panel is not particularly limited in this embodiment.
In this embodiment, the first electrode 12 may be understood as an anode to which a positive voltage is applied during electroluminescence (first electrode 12). The material of the first electrode 12 in this embodiment may be ito. Specifically, the first electrode 12 at least includes a reflective film, the reflective film may be located on a surface of the first electrode 12 facing away from the first substrate 10, and the material of the reflective film may be silver. The first electrode 12 may further include a transparent conductive film on a surface of the reflective film facing away from the first substrate 10, and the transparent conductive film may be made of indium tin oxide or indium zinc oxide.
In this embodiment, the second electrode 14 can be understood as a cathode to which a negative voltage can be applied during electroluminescence (second electrode 14). The material of the second electrode 14 may be a low work function metal material or a low work function composite metal material such as Ag, Al, Ca, In, Li, Mg, etc. The material of the second electrode 14 in this example may be one of a silver alloy, a silver-ytterbium alloy, or a silver-rare earth metal alloy.
It is understood that the organic light emitting display panel 1 has m light emission colors, m is an integer greater than or equal to 3, and the exemplary embodiment may include three light emission colors, red, green and blue, respectively, and each organic light emitting device 11 corresponds to one light emission color.
With continued reference to fig. 1, the organic light emitting display panel 1 in this example can be understood as a top emission organic light emitting display panel, that is, the first electrode 12 can be understood as a total reflection anode, and the second electrode 14 can be understood as a semi-transparent cathode, wherein the total reflection anode (the first electrode 12) and the semi-transparent cathode (the second electrode 14) form a microcavity (resonant cavity), and when the cavity length and the wavelength of the light wave of the microcavity structure satisfy a certain relationship, the light with a specific wavelength (the wavelength of a certain monochromatic light) is enhanced, the spectrum is narrowed, and the microcavity effect occurs. The microcavity effect has functions of selecting, narrowing, and enhancing a light source, and is often used to improve chromaticity of an organic light emitting device, enhance emission intensity of a specific wavelength, change a light emitting color of the organic light emitting device, and the like.
In the prior art, the microcavity effect includes two interference modes, namely wide-angle interference and multi-beam interference, wherein the wide-angle interference affects the viewing angle characteristics of the organic light emitting device, that is, the light emission peak shifts with the shift of the viewing angle, which results in luminance difference and chromaticity drift, and especially under a large viewing angle, the optical property is poor and the color shift is serious.
If the angle at which the eyes are perpendicular to the screen is referred to as a positive viewing angle, the angle can be set to 0 °, and the microcavity effect of the light emitted at the angle is most obvious, that is, the light emitted at the viewing angle is full in color and does not have color cast or the color cast is not perceived by human eyes. When the eye is tilted to the left or right, the angle is an absolute value, for example, the eye is tilted to the right by 45 °, the angle is 45 °, the eye is tilted to the left by 45 °, and the angle is 45 °. And the large viewing angle can be understood by increasing the angle of the oblique viewing angle to a certain degree, and under the large viewing angle, the luminous peak shifts, which causes color cast.
In order to solve the above problems, the inventors have devised the following technical solutions:
in this embodiment, as shown in fig. 2 and fig. 3, which are schematic structural diagrams of an organic light emitting display panel provided in an embodiment of the present invention, the organic light emitting display panel 1 includes: a plurality of sub-pixel units 2 distributed in an array, it being understood that each sub-pixel unit 2 comprises one organic light emitting device 11.
And, with continued reference to fig. 3, each sub-pixel element 2 comprises at least a first region 21 and a second region 22. The first region 21 has a first microcavity structure 210, and the second region 22 has a second microcavity structure 220, wherein a wavelength of a maximum light emission peak of light emitted from the first microcavity structure 210 is longer than a wavelength of a maximum light emission peak of light emitted from the second microcavity structure 220. It can be understood that the wavelength of the maximum light-emitting peak of the emergent light is the peak position of the intrinsic peak corresponding to the emergent light color of the sub-pixel unit 2, that is, the wavelength corresponding to the intrinsic peak of the emergent light color.
Taking the color of the light emitted from the sub-pixel unit 2 as red as an example, the light emitting principle of the present embodiment is briefly described:
the resonant wavelength in the microcavity structure has the following relation with the viewing angle:
λ＝2πmL*cosΨ
wherein λ is resonance wavelength at different viewing angles, Ψ is a viewing angle, L is wavelength of a native peak of light emission color corresponding to the sub-pixel unit, and m is the number of stages of the emission mode. From the above relation, when the wavelength L of the eigenpeak of the light emission color is constant, the viewing angle Ψ and the resonance wavelength λ have an inverse relationship.
In this case, assuming that the wavelength of the intrinsic peak corresponding to red is 610nm, and the color emitted by light having a wavelength of 610nm is understood as positive red, if the resonance wavelength is equal to the wavelength of the intrinsic peak, it indicates that the light emitted from the microcavity structure is positive red.
However, as the viewing angle increases, that is, as the viewing angle changes from 0 ° at a normal viewing angle to 90 ° at an oblique viewing angle, the resonant wavelength decreases, so that the color of the light emitted from the microcavity structure shifts and becomes no longer positive red. In this embodiment, the wavelength of the maximum light emission peak of the light emitted from the first microcavity structure 210 in the first region 21 is adjusted to be greater than the wavelength of the maximum light emission peak of the light emitted from the second microcavity structure 220 in the second region 22, that is, the wavelength of the intrinsic peak of the light emission color in the first region 21 in the sub-pixel unit 2 is greater than the wavelength of the intrinsic peak of the light emission color in the second region 22 in the sub-pixel unit 2, and for example, the wavelength of the intrinsic peak in the first region 21 may be 615 nm. Since the resonant wavelength of the light emitted from the microcavity structure is inversely proportional to the viewing angle, after the light is emitted from a large viewing angle, although the viewing angle Ψ increases, the wavelength L of the intrinsic peak of the light emission color also increases, so that the resonant wavelength at the large viewing angle is close to the resonant wavelength at the normal viewing angle or the small viewing angle, and the color of the light emitted from the large viewing angle or the oblique viewing angle is close to red.
In this embodiment, the wavelength of the intrinsic peak in the first microcavity structure 210 is increased to be greater than the wavelength of the intrinsic peak in the second microcavity structure 220, and it can also be understood that the present embodiment compensates the resonant wavelength at the large viewing angle to make it close to the resonant wavelength at the normal viewing angle or the small viewing angle, so that the color of the light emitted at the large viewing angle or the oblique viewing angle is close to the color of the light emitted at the normal viewing angle, and further the color cast phenomenon at the large viewing angle or the oblique viewing angle is improved.
Further, in the present embodiment, there may be a plurality of positional relationships between the first region 21 and the second region 22, and for example, the positional relationship may be as shown in fig. 3, the second region 22 is located in a central region of the sub-pixel unit 2, the first region 21 is located in a peripheral region of the sub-pixel unit 2, and an orthographic projection of the first region 21 on the organic light emitting display panel does not overlap with an orthographic projection of the second region 22 on the organic light emitting display panel. In this embodiment, with the azimuth shown in fig. 3 as a reference, in the process of changing the normal viewing angle and the oblique viewing angle, no matter the front viewing angle or the oblique viewing angle is changed to the left or the right, the resonance wavelength under the oblique viewing angle can be compensated, so that the viewing angle color cast phenomenon under the large viewing angle or the oblique viewing angle is improved.
In addition, as shown in fig. 4, which is another structural schematic diagram of the organic light emitting display panel according to the embodiment of the present invention, in a specific device, it is only necessary to improve color shift of a left side or a right side with a large viewing angle, in this case, a peripheral region is disposed at a periphery of a central region, that is, the second region 22 is disposed in the central region, and the first region 21 is disposed in the peripheral region of the central region.
In one embodiment, the difference between the wavelength of the maximum light-emitting peak of the light emitted from the first microcavity structure and the wavelength of the maximum light-emitting peak of the light emitted from the second microcavity structure is X, wherein X is greater than 0nm and less than or equal to 5 nm. If X is greater than 5nm, the color of the light emitted from the first microcavity structure is different from the color of the light emitted from the second microcavity structure or the color deviation is large, which affects the display, and therefore, in order to ensure that the colors of the light emitted from the first microcavity structure and the second microcavity structure are the same or similar, the difference between the wavelength of the maximum light emission peak of the light emitted from the first microcavity structure (the intrinsic peak of the light emission color) and the wavelength of the maximum light emission peak of the light emitted from the second microcavity structure (the intrinsic peak of the light emission color) should be within 5 nm.
In order to clearly understand the present embodiment, the following briefly describes the light emitting principle of the organic light emitting display panel of the present embodiment:
as shown in fig. 5, which is another schematic structural diagram of the organic light emitting display panel according to the embodiment of the present invention, the organic functional layer 13 included in the organic light emitting device 11 in the sub-pixel unit 2 includes an electron transport layer 131, a hole transport layer 133, and a light emitting layer 132, where the electron transport layer 131 is disposed near the second electrode 14, the hole transport layer 133 is disposed near the first electrode 12, and the light emitting layer 132 is disposed between the electron transport layer 131 and the hole transport layer 133.
Under the action of the applied electric field, electrons e are injected from the second electrode 14 (cathode) into the organic functional layer 13, and holes h are injected from the first electrode 12 (anode) into the organic functional layer 13. The injected electrons e migrate from the electron transport layer 131 of the organic functional layer 13 to the light emitting layer 132, and the injected holes h migrate from the hole transport layer 133 of the organic functional layer 13 to the light emitting layer 132. The injected electrons e and the injected holes h generate excitons after recombination in the light-emitting layer 132. The excitons migrate under the action of the electric field, transferring energy to the organic light emitting molecules in the light emitting layer 132, electrons of the organic light emitting molecules transition from a ground state to an excited state and release energy, and finally the energy is released in the form of photons and emits light.
In one embodiment, as shown in fig. 6, the sub-pixel unit 2 in the present embodiment includes at least a first color sub-pixel unit 201, a second color sub-pixel unit 202, and a third color sub-pixel unit 203. Illustratively, each of the first color sub-pixel unit 201, the second color sub-pixel unit 202, and the third color sub-pixel unit 203 is one of a red sub-pixel unit, a blue sub-pixel unit, and a green sub-pixel unit.
In one embodiment, the present embodiment changes the doping concentration of the guest material in the light emitting layer or changes the doping material of the guest material in the light emitting layer such that the wavelength of the intrinsic peak of the light emission color (wavelength of the maximum light emission peak) in the first region is longer than the wavelength of the intrinsic peak of the light emission color (wavelength of the maximum light emission peak) in the second region:
in the first case, the guest material in the light emitting layer 132 corresponding to the first region 21 is the same as the guest material in the light emitting layer 132 corresponding to the second region 22, wherein the doping concentration percentage of the guest material in the light emitting layer 132 corresponding to the first region 21 is greater than the doping concentration percentage of the guest material in the light emitting layer 132 corresponding to the second region 22.
After the doping concentration of the guest material of the light emitting layer corresponding to the first region is increased, the forbidden bandwidth of the guest material of the light emitting layer in the first region is decreased, so that the spectrum red shift of the light emitting color, that is, the light emitting peak shifts. Moreover, the guest material has a certain electron mobility, and when the doping concentration is increased, the light emitting position shifts to the hole side, which may also cause shift of the light emitting peak, and further the wavelength corresponding to the light emission color is lengthened, that is, the wavelength of the intrinsic peak corresponding to the light emission color is increased. As is apparent from the relationship between the resonance wavelength and the wavelength of the emission color intrinsic peak, the wavelength of the emission color intrinsic peak increases, and the resonance wavelength at the viewing angle increases. And because the first area is arranged in the peripheral area and the second area is arranged in the central area, namely, the resonance wavelength under an oblique viewing angle or a large viewing angle is increased, so that the resonance wavelength under the oblique viewing angle or the large viewing angle is close to the resonance wavelength under the normal viewing angle, and the light emitting color under the oblique viewing angle or the large viewing angle is close to the light emitting color under the normal viewing angle, thereby improving the color cast phenomenon under the oblique viewing angle or the large viewing angle.
Further, in a specific embodiment, the first color sub-pixel unit 201 is a red sub-pixel unit, in which the difference between the doping concentration percentage of the guest material in the light emitting layer 132 corresponding to the first region 21 and the doping concentration percentage of the guest material in the light emitting layer 132 corresponding to the second region 22 is A, and A is greater than or equal to 2% and less than or equal to 7%.
As can be seen from the above embodiments, the difference between the wavelength of the maximum light-emitting peak in the first region (the wavelength of the intrinsic peak corresponding to the light-emitting color) and the wavelength of the maximum light-emitting peak in the second region (the wavelength of the intrinsic peak corresponding to the light-emitting color) needs to be less than 5nm, so as to ensure that the color of the light emitted from the first region is the same as or similar to the color of the light emitted from the second region, and further ensure that the sub-pixel unit emits the light of the same color. At this time, for the red sub-pixel unit, it is necessary to control the difference a between the doping concentration of the guest material of the light-emitting layer in the first region and the doping concentration of the guest material of the light-emitting layer in the second region within a certain range, for example, 2% to 7%.
Further, in another specific embodiment, the second color sub-pixel unit 202 is a blue sub-pixel unit, in which the difference between the doping concentration percentage of the guest material in the light-emitting layer 132 corresponding to the first region 21 and the doping concentration percentage of the guest material in the light-emitting layer corresponding to the second region 22 is B, and B is greater than or equal to 6% and less than or equal to 12%.
As can be seen from the above embodiments, the difference between the wavelength of the maximum light-emitting peak in the first region (the wavelength of the intrinsic peak corresponding to the light-emitting color) and the wavelength of the maximum light-emitting peak in the second region (the wavelength of the intrinsic peak corresponding to the light-emitting color) needs to be less than 5nm, so as to ensure that the color of the light emitted from the first region is the same as or similar to the color of the light emitted from the second region, and further ensure that the sub-pixel unit emits the light of the same color. At this time, for the blue sub-pixel unit, it is necessary to control the difference B between the doping concentration of the guest material of the light emitting layer in the first region and the doping concentration of the guest material of the light emitting layer in the second region within a certain range, illustratively, 6% B12%.
Further, in another specific embodiment, the third color sub-pixel unit is a green sub-pixel unit, and in the green sub-pixel unit, the difference between the doping concentration percentage of the guest material in the light-emitting layer corresponding to the first region and the doping concentration percentage of the guest material in the light-emitting layer corresponding to the second region is C, and C is greater than or equal to 1% and less than or equal to 5%.
As can be seen from the above embodiments, the difference between the wavelength of the maximum light-emitting peak in the first region (the wavelength of the intrinsic peak corresponding to the light-emitting color) and the wavelength of the maximum light-emitting peak in the second region (the wavelength of the intrinsic peak corresponding to the light-emitting color) needs to be less than 5nm, so as to ensure that the color of the light emitted from the first region is the same as or similar to the color of the light emitted from the second region, and further ensure that the sub-pixel unit emits the light of the same color. At this time, for the green sub-pixel unit, the difference C between the doping concentration of the guest material of the light-emitting layer in the first region and the doping concentration of the guest material of the light-emitting layer in the second region needs to be controlled within a certain range, for example, 1% to 5%.
In the second case, the guest material in the light emitting layer 132 corresponding to the first region 21 is different from the guest material in the light emitting layer 132 corresponding to the second region 22, wherein the wavelength of the maximum light emission peak of the guest material in the light emitting layer 132 corresponding to the first region 21 is longer than the wavelength of the maximum light emission peak of the guest material in the light emitting layer 132 corresponding to the second region 22. In this embodiment, different guest materials are doped in the light emitting layer in the first region and the light emitting layer in the second region, so that the wavelengths of the maximum light emitting peaks corresponding to the two regions are different, and further, the color shift under a large viewing angle or an oblique viewing angle is improved. Specifically, according to the above relational expression, as the viewing angle increases, the resonance wavelength becomes shorter, while the wavelength of the intrinsic peak increases, and the resonance wavelength increases, so in this embodiment, the wavelength of the maximum light emission peak (wavelength of the intrinsic peak) corresponding to the guest material of the light emitting layer 132 in the first region 21 is changed to be longer than the wavelength of the maximum light emission peak (wavelength of the intrinsic peak) corresponding to the guest material of the light emitting layer 132 in the second region, and the wavelength of the guest material in the light emitting layer in the first region (peripheral region) is increased, that is, the resonance wavelength at the oblique viewing angle is increased, so that when light is emitted from the first region (peripheral region), the resonance wavelength at the oblique viewing angle approaches the resonance wavelength at the normal viewing angle, and the color shift at the oblique viewing angle or the large viewing angle is improved.
In one embodiment, the first microcavity structure corresponds to a different cavity length than the second microcavity structure. The cavity length of the microcavity may be understood as the thickness of the first electrode (anode) 12 to the second electrode (cathode) 14 in a direction perpendicular to the organic light emitting display panel.
Specifically, the cavity length corresponding to the first microcavity structure and the cavity length corresponding to the second microcavity structure have the following two relationships:
first, the cavity length corresponding to the first microcavity structure is longer than the cavity length corresponding to the second microcavity structure. As shown in fig. 7, which is another structural schematic diagram of the organic light emitting display panel according to the embodiment of the present invention, the cavity length Y corresponding to the first micro-cavity structure 210 is greater than the cavity length X corresponding to the second micro-cavity structure 220.
Second, the cavity length corresponding to the first microcavity structure is smaller than the cavity length corresponding to the second microcavity structure. As shown in fig. 8, which is another structural schematic diagram of the organic light emitting display panel according to the embodiment of the present invention, a cavity length Y corresponding to the first micro-cavity structure 210 is smaller than a cavity length X corresponding to the second micro-cavity structure 220. In this embodiment, the cavity length of the second microcavity disposed in the central region (the second region 22) is longer, so that the light emitted at a normal viewing angle or a small viewing angle can be ensured not to be blocked, and the light-emitting rate is increased.
It should be noted that the sub-pixel units shown in fig. 7 and 8 may be red sub-pixel units and/or blue sub-pixel units and/or green sub-pixel units, and the specific situation may depend on specific products.
Furthermore, in this embodiment, the cavity length corresponding to the microcavity structure can be changed by changing the thickness of the hole transport layer, that is, in a direction perpendicular to the organic light emitting display panel, the thickness of the hole transport layer corresponding to the first microcavity structure is not equal to the thickness of the hole transport layer corresponding to the second microcavity structure. With reference to the foregoing embodiments, as shown in fig. 9 and fig. 10, both are schematic structural diagrams of another organic light emitting display panel provided in the embodiment of the present invention, and as shown in fig. 9, a thickness of the hole transport layer 1331 corresponding to the first microcavity structure is greater than a thickness of the hole transport layer 1332 corresponding to the second microcavity structure. As shown in fig. 10, the thickness of the hole transport layer 1332 corresponding to the second microcavity structure is greater than the thickness of the hole transport layer 1331 corresponding to the first microcavity structure.
In this embodiment, a display device is provided, as shown in fig. 11, which is a schematic structural diagram of the display device provided in the embodiment of the present invention, and the display device 500 includes the organic light emitting display panel 1 according to this embodiment. It should be noted that, although fig. 11 illustrates a mobile phone as an example, the display device is not limited to the mobile phone, and specifically, the display device may include, but is not limited to, any electronic device having a display function, such as a Personal Computer (PC), a Personal Digital Assistant (PDA), a wireless handheld device, a Tablet Computer (Tablet Computer), an MP4 player, or a television.
Since the display device 500 includes the organic light-emitting display panel 1, in the present embodiment, the wavelength of the maximum emission peak of light emitted from the first microcavity structure in the first region is adjusted to be longer than the wavelength of the maximum emission peak of light emitted from the second microcavity structure in the second region, that is, the wavelength of the intrinsic peak of the emission color in the first region in the sub-pixel unit is longer than the wavelength of the intrinsic peak of the emission color in the second region in the sub-pixel unit. Since the resonant wavelength of the light emitted from the microcavity structure is inversely proportional to the viewing angle, after the light is emitted from a large viewing angle, although the viewing angle is increased, the wavelength of the intrinsic peak of the light color is increased, so that the resonant wavelength of the light emitted from the large viewing angle or an oblique viewing angle is compensated, the resonant wavelength of the light emitted from the large viewing angle or the oblique viewing angle is close to the resonant wavelength of the light emitted from the normal viewing angle or the small viewing angle, and the viewing angle color cast phenomenon of the light emitted from the large viewing angle or the oblique viewing angle is improved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. An organic light emitting display panel, comprising:
the pixel structure comprises a plurality of sub-pixel units distributed in an array, wherein each sub-pixel unit at least comprises a first area and a second area;
the first region is provided with a first microcavity structure, the second region is provided with a second microcavity structure, and the wavelength of the maximum light-emitting peak of emergent light of the first microcavity structure is larger than that of emergent light of the second microcavity structure;
the second region is located in a central region of the sub-pixel unit, the first region is located in a peripheral region of the sub-pixel unit, the first region surrounds the second region, an orthographic projection of the first region on the organic light-emitting display panel is not overlapped with an orthographic projection of the second region on the organic light-emitting display panel, and a cavity length corresponding to the first microcavity structure is longer than a cavity length corresponding to the second microcavity structure;
the guest material in the light-emitting layer corresponding to the first region is different from the guest material in the light-emitting layer corresponding to the second region, wherein the wavelength of the maximum light emission peak of the guest material in the light-emitting layer corresponding to the first region is longer than the wavelength of the maximum light emission peak of the guest material in the light-emitting layer corresponding to the second region.
2. The organic light emitting display panel of claim 1,
the difference value of the wavelength of the maximum luminous peak of the emergent light of the first microcavity structure and the wavelength of the maximum luminous peak of the emergent light of the second microcavity structure is X, wherein X is more than 0nm and less than or equal to 5 nm.
3. The organic light emitting display panel of claim 1,
the sub-pixel units at least comprise a first color sub-pixel unit, a second color sub-pixel unit and a third color sub-pixel unit.
4. The organic light emitting display panel of claim 3,
the first color sub-pixel unit is a red sub-pixel unit, in the red sub-pixel unit, the difference value of the doping concentration percentage of the guest material in the light emitting layer corresponding to the first area and the doping concentration percentage of the guest material in the light emitting layer corresponding to the second area is A, and A is more than or equal to 2% and less than or equal to 7%.
5. The organic light emitting display panel of claim 3,
the second color sub-pixel unit is a blue sub-pixel unit, in the blue sub-pixel unit, the difference value between the doping concentration percentage of the guest material in the light emitting layer corresponding to the first area and the doping concentration percentage of the guest material in the light emitting layer corresponding to the second area is B, and B is more than or equal to 6% and less than or equal to 12%.
6. The organic light emitting display panel of claim 3,
the third color sub-pixel unit is a green sub-pixel unit, in the green sub-pixel unit, the difference value between the doping concentration percentage of the guest material in the light emitting layer corresponding to the first area and the doping concentration percentage of the guest material in the light emitting layer corresponding to the second area is C, and C is more than or equal to 1% and less than or equal to 5%.
7. The organic light emitting display panel of claim 1,
in a direction perpendicular to the organic light-emitting display panel, the thickness of the hole transport layer corresponding to the first microcavity structure is not equal to the thickness of the hole transport layer corresponding to the second microcavity structure.
8. A display device characterized by comprising the organic light-emitting display panel according to any one of claims 1 to 7.
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| CN109904196A (en) * | 2019-01-30 | 2019-06-18 | 武汉华星光电半导体显示技术有限公司 | Display panel and preparation method thereof, electronic device |
| CN111755609B (en) * | 2019-03-29 | 2023-09-29 | 北京小米移动软件有限公司 | OLED display screen and electronic equipment |
| CN110379934B (en) * | 2019-07-12 | 2023-06-30 | 昆山国显光电有限公司 | Display panel and display device |
| JP6904386B2 (en) * | 2019-07-24 | 2021-07-14 | セイコーエプソン株式会社 | Light emitting device, manufacturing method of light emitting device and electronic equipment |
| JP6933231B2 (en) * | 2019-07-24 | 2021-09-08 | セイコーエプソン株式会社 | Light emitting device, manufacturing method of light emitting device, and electronic equipment |
| JP6911891B2 (en) * | 2019-07-24 | 2021-07-28 | セイコーエプソン株式会社 | Light emitting device, manufacturing method of light emitting device and electronic equipment |
| JP6911890B2 (en) * | 2019-07-24 | 2021-07-28 | セイコーエプソン株式会社 | Light emitting device, manufacturing method of light emitting device, and electronic equipment |
| CN111106155B (en) * | 2019-12-30 | 2022-10-25 | 武汉天马微电子有限公司 | Display panel and display device |
| CN113594386B (en) * | 2021-07-28 | 2022-09-23 | 京东方科技集团股份有限公司 | Display panel and display device |
| CN113629114B (en) * | 2021-07-30 | 2023-02-03 | 深圳市华星光电半导体显示技术有限公司 | Display panel |
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Effective date of registration: 20211025 Address after: No.8, liufangyuan Henglu, Donghu New Technology Development Zone, Wuhan City, Hubei Province Patentee after: WUHAN TIANMA MICROELECTRONICS Co.,Ltd. Address before: Room 509, building 1, No. 6111, Longdong Avenue, Pudong New Area, Shanghai, 201201 Patentee before: SHANGHAI TIANMA AM-OLED Co.,Ltd. |