CN114171697B - Display panel and display device - Google Patents
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- CN114171697B CN114171697B CN202111298953.7A CN202111298953A CN114171697B CN 114171697 B CN114171697 B CN 114171697B CN 202111298953 A CN202111298953 A CN 202111298953A CN 114171697 B CN114171697 B CN 114171697B
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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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- 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
- H10K50/805—Electrodes
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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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- 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
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Abstract
The embodiment of the invention provides a display panel and a display device, relates to the technical field of display, and is used for inhibiting light emission of a second organic light emitting unit and ensuring the display effect of the display panel. The display area of the display panel includes a first organic light emitting unit; the first organic light emitting unit includes a first light emitting layer, a first transparent electrode, and a first reflective electrode; the first transparent electrode is positioned at one side of the first reflecting electrode far away from the substrate, and the first light-emitting layer is positioned at one side of the first transparent electrode far away from the first reflecting electrode; the temperature sensing region comprises a temperature sensor, and the temperature sensor comprises a second organic light emitting unit; the second organic light emitting unit includes a second light emitting layer, a second transparent electrode, and a second reflective electrode; the second transparent electrode is positioned at one side of the second reflecting electrode far away from the substrate, and the second light-emitting layer is positioned at one side of the second transparent electrode far away from the second reflecting electrode; the thickness of the second transparent electrode is different from the thickness of the first transparent electrode.
Description
[ field of technology ]
The present invention relates to the field of display technologies, and in particular, to a display panel and a display device.
[ background Art ]
With the continuous development of science and technology, more and more display devices are widely applied to daily life and work of people, and become an indispensable important tool for people today. In addition, with the continuous development of display technology, the requirements of consumers on displays are continuously improved, various display layers are endless, and display technologies such as liquid crystal display, organic light emitting display and the like are appeared. On the basis, the technologies of 3D display, touch display, curved surface display, ultra-high resolution display and the like are also continuously emerging.
An Organic Light-Emitting Diode (OLED) display panel has many advantages such as active Light emission, high contrast, no viewing angle limitation, etc., and is widely used in the display technology field. Since the IV characteristic of an OLED varies with temperature, the change in the IV characteristic causes a change in the brightness of the OLED, and thus the screen is required to have a temperature compensation capability. It is common practice to provide a temperature sensor in the display panel, the temperature sensor comprising an OLED device having the same structure as the display sub-pixels in the display area. The temperature of the temperature sensor may reflect the temperature of the display area. When the display area is driven to display, the driving signals of the sub-pixels in the display area can be adjusted according to the temperature fed back by the temperature sensor, so that stable display of the display panel is realized.
However, the current temperature sensor emits light in the temperature feedback process, which affects the normal display of the OLED display panel.
[ invention ]
In view of the above, the embodiments of the present invention provide a display panel and a display device, which are used for solving the problem of light leakage of a temperature sensor in the prior art, and ensuring normal display of the display panel.
In one aspect, an embodiment of the present invention provides a display panel including a substrate; the substrate comprises a display area and a temperature sensing area;
the display region includes a first organic light emitting unit; the first organic light emitting unit includes a first light emitting layer, a first transparent electrode, and a first reflective electrode; the first transparent electrode is positioned at one side of the first reflecting electrode away from the substrate, and the first light-emitting layer is positioned at one side of the first transparent electrode away from the first reflecting electrode;
the temperature sensing region comprises a temperature sensor, and the temperature sensor comprises a second organic light emitting unit; the second organic light emitting unit includes a second light emitting layer, a second transparent electrode, and a second reflective electrode; the second transparent electrode is positioned at one side of the second reflecting electrode away from the substrate, and the second light-emitting layer is positioned at one side of the second transparent electrode away from the second reflecting electrode;
the thickness of the second transparent electrode is different from the thickness of the first transparent electrode.
On the other hand, the embodiment of the invention provides a display device which comprises the display panel.
According to the display panel and the display device provided by the embodiment of the invention, the thickness of the second transparent electrode is different from that of the first transparent electrode, so that the lengths of the microcavities of the first organic light-emitting unit and the second organic light-emitting unit are different, the microcavity effect can exert different influences on the first organic light-emitting unit and the second organic light-emitting unit, the light-emitting intensity of the first organic light-emitting unit is enhanced, the light-emitting intensity of the second organic light-emitting unit is inhibited, and for example, the temperature sensing area does not emit light or the light-emitting brightness of the temperature sensing area is low. The temperature detection is performed by using the second organic light emitting unit, and meanwhile, the display effect of the display panel is not affected.
In addition, by adopting the design mode, the thicknesses of the first transparent electrode and the second transparent electrode are only required to be different, and other film layers in the display panel, such as the materials of the first reflecting electrode and the second reflecting electrode, and the thicknesses and the materials of the third electrode and the fourth electrode, can be set to be the same, so that the process is simple. The temperature sensing area Ts is not required to be additionally provided with a black matrix or other shading structures for shading while not emitting light, so that the process complexity of the display panel can be prevented from being increased.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic top view of a display panel according to an embodiment of the invention;
fig. 2 is a schematic cross-sectional view of a display area of a display panel according to an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of a temperature sensing area of a display panel according to an embodiment of the present invention;
FIG. 4 is a graph of cavity length versus gain wavelength for a second region;
FIG. 5 is a schematic diagram of the cavity length and gain bands of the first region and the second region;
FIG. 6 is a schematic cross-sectional view of a display area of another display panel according to an embodiment of the present invention;
FIG. 7 is a schematic cross-sectional view of a temperature sensing area of another display panel according to an embodiment of the invention;
fig. 8 is a schematic diagram of a display device according to an embodiment of the invention.
[ detailed description ] of the invention
For a better understanding of the technical solution of the present invention, the following detailed description of the embodiments of the present invention refers to the accompanying drawings.
It should be understood that the described embodiments are merely some, but not all, embodiments of the invention. 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 be within the scope of the 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 this application 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 relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
It should be understood that although the terms first, second, etc. may be used to describe the organic light emitting units in the embodiments of the present invention, the organic light emitting units should not be limited to these terms. These terms are only used to distinguish the organic light emitting units from each other. For example, the first organic light emitting unit may also be referred to as a second organic light emitting unit, and similarly, the second organic light emitting unit may also be referred to as a first organic light emitting unit, without departing from the scope of the embodiments of the present invention.
An embodiment of the present invention provides a display panel, as shown in fig. 1, fig. 2 and fig. 3, fig. 1 is a schematic top view of the display panel provided by the embodiment of the present invention, fig. 2 is a schematic cross-sectional view of a display area of the display panel provided by the embodiment of the present invention, and fig. 3 is a schematic cross-sectional view of a temperature sensing area of the display panel provided by the embodiment of the present invention, where the display panel includes a substrate 1. The substrate 1 includes a display area AA and a temperature sensing area Ts.
As shown in fig. 2, the display area AA includes a plurality of first organic light emitting units 21. The first organic light emitting unit 21 includes a first light emitting layer 210, a first transparent electrode 211, and a first reflective electrode 212. The first transparent electrode 211 is located at a side of the first reflective electrode 212 remote from the substrate 1, and the first light emitting layer 210 is located at a side of the first transparent electrode 211 remote from the first reflective electrode 212.
The temperature sensing region Ts includes a temperature sensor. As shown in fig. 3, the temperature sensor includes a second organic light emitting unit 22. The second organic light emitting unit 22 includes a second light emitting layer 220, a second transparent electrode 221, and a second reflective electrode 222; the second transparent electrode 221 is located at a side of the second reflective electrode 222 away from the substrate 1, and the second light emitting layer 220 is located at a side of the second transparent electrode 221 away from the second reflective electrode 222.
Illustratively, as shown in fig. 2, the first organic light emitting unit 21 further includes a third electrode 213, the third electrode 213 being located at a side of the first light emitting layer 210 remote from the substrate 1. Alternatively, the third electrode 213 may be a semi-transparent and semi-reflective electrode, and a microcavity structure is formed between the third electrode 213 and the first reflective electrode 212.
As shown in fig. 3, the second organic light emitting unit 22 further includes a fourth electrode 223, and the fourth electrode 223 is located at a side of the second light emitting layer 220 remote from the substrate 1. Alternatively, the fourth electrode 223 may be a semi-transparent and semi-reflective electrode, and a microcavity structure is formed between the fourth electrode 223 and the second reflective electrode 222.
That is, in the embodiment of the present invention, the first and second organic light emitting units 21 and 22 each have a microcavity structure. Wherein the microcavity length of the first organic light emitting unit 21 is the distance between the first reflective electrode 212 and the third electrode 213. The microcavity length of the second organic light-emitting unit 22 is the distance between the second reflective electrode 222 and the fourth electrode 223.
For example, the first transparent electrode 211 and the second transparent electrode 221 may be formed by selecting any one or more of transparent metal oxides such as Indium Tin Oxide (ITO), indium zinc Oxide (Indium Zinc Oxide, IZO), and Indium gallium zinc Oxide (Indium Gallium Zinc Oxide, IGZO). The first and second reflective electrodes 212 and 222 may be formed of a metal such as Ag. The third electrode 213 and the fourth electrode 223 may be formed by selecting a metal material.
The first reflective electrode 212 may be an anode of the first organic light emitting unit 21, and the third electrode 213 may be a cathode of the first organic light emitting unit 21. The second reflective electrode 222 is an anode of the second organic light emitting unit 22, and the fourth electrode 223 is a cathode of the second organic light emitting unit 22. After voltages are applied to the first reflective electrode 212 and the third electrode 213, respectively, the first light emitting layer 210 between the first reflective electrode 212 and the third electrode 213 is stimulated to emit light. After voltages are applied to the second reflective electrode 222 and the fourth electrode 223, respectively, the second light emitting layer between the second reflective electrode 222 and the fourth electrode 223 is stimulated to emit light.
In the embodiment of the present invention, the thickness d of the second transparent electrode 221 and the thickness h of the first transparent electrode 211 are different.
In the embodiment of the present invention, the corresponding film layers in the second organic light emitting unit 22 and the first organic light emitting unit 21 may be formed using the same process. For example, the second reflective electrode 222 in the second organic light emitting unit 22 and the first reflective electrode 212 in the first organic light emitting unit 21 may be formed using the same process, and the second transparent electrode 221 in the second organic light emitting unit 22 and the first transparent electrode 211 in the first organic light emitting unit 21 may be formed using the same process. In preparing the first transparent electrode 211 and the second transparent electrode 221 having different thicknesses, half gray tone Mask (Halftone Mask) may be used. So arranged, the second organic light emitting unit 22 can be enabled to accurately feedback the temperature of the display area AA in which the first organic light emitting unit 21 is arranged. When the first organic light emitting unit 21 in the display area AA is driven to emit light, the driving circuit in the display panel can adjust the driving signal of the first organic light emitting unit 21 according to the temperature fed back by the second organic light emitting unit 22, so that the display panel can realize temperature compensation, eliminate the influence of temperature on the brightness of the first organic light emitting unit 21, and improve the brightness stability of the display area AA.
Since the microcavity length can affect the spectrum peak value of the light emitted from the microcavity, that is, the light emitted from the first organic light emitting unit 21 and the second organic light emitting unit 22 is related to the respective microcavity lengths, the embodiment of the present invention can make the first organic light emitting unit 21 and the second organic light emitting unit 22 have different microcavity lengths by making the thickness d of the second transparent electrode 221 and the thickness h of the first transparent electrode 211 different, so that the microcavity effect can exert different effects on the light emitted from the first organic light emitting unit 21 and the second organic light emitting unit 22, so that the light emitted from the display area AA corresponding to the first organic light emitting unit 21 in the display panel is enhanced, and the light emitted from the temperature sensing area Ts corresponding to the second organic light emitting unit 22 in the display panel is suppressed. By adopting the arrangement mode of the embodiment of the invention, the temperature sensing area Ts can not emit light or have lower brightness when the second organic light emitting unit 22 is used for temperature sensing, so that the display effect of the display panel is not influenced.
In addition, by adopting the design mode, the thicknesses of the first transparent electrode and the second transparent electrode are only required to be different, and other film layers in the display panel, such as the materials of the first reflecting electrode and the second reflecting electrode, and the thicknesses and the materials of the third electrode and the fourth electrode, can be set to be the same, so that the process is simple. The temperature sensing area Ts is not required to be additionally provided with a black matrix or other shading structures for shading while not emitting light, so that the process complexity of the display panel can be prevented from being increased.
It should be noted that, the positional relationship between the display area AA and the temperature sensing area Ts shown in fig. 1 is only one schematic, and the positions of the display area AA and the temperature sensing area Ts may be set according to different design requirements when designing the display panel, which is not limited in the embodiment of the present invention.
For example, as shown in fig. 2 and 3, the display area AA and the temperature sensing area Ts may each include a filter 3. In the display area AA, the filter 3 is located at a side of the first organic light emitting unit 21 remote from the substrate 1. In the temperature sensing region Ts, the filter 3 is located at a side of the second organic light emitting unit 22 remote from the substrate 1. As shown in fig. 2 and 3, the optical filter 3 at least partially overlaps the first light emitting layer 210 and the second light emitting layer 220, respectively, in a direction perpendicular to the plane of the substrate 1.
For example, the filters 3 may have different light emission colors at positions corresponding to the sub-pixels of different colors. The filter 3 having a certain light-emitting color can transmit only light of a specific wavelength by absorbing light of other wavelengths. For example, white light can emit red light after passing through a red filter and blue light after passing through a blue filter.
For example, in designing the first organic light emitting unit 21, the thickness h of the first transparent electrode 211 may be adjusted in the embodiment of the present invention, so that the microcavity of the first organic light emitting unit 21 satisfies that the gain band overlaps with the transmission band of the corresponding optical filter 3.
When the second organic light emitting unit 22 is disposed, the thickness d of the second transparent electrode 221 may be adjusted in the embodiment of the present invention, so that the microcavity of the second organic light emitting unit 22 satisfies that the gain band does not overlap with the transmission band of the corresponding optical filter 3. For example, for the second organic light emitting unit 22 disposed corresponding to the red color filter, the thickness of the second transparent electrode 221 in the second organic light emitting unit 22 may be adjusted so that the gain band of the microcavity of the second organic light emitting unit 22 is a green light band or a blue light band. Taking the example that the gain band of the microcavity falls within the green band, when the temperature of the display area AA is fed back by the second organic light emitting unit 22, the light emitted from the second light emitting layer 220 in the green band is enhanced due to the compliance of the microcavity resonance condition, and the light in other bands is suppressed due to the non-compliance of the microcavity resonance condition. Therefore, the light emitted from the second organic light emitting unit 22 will be mainly green light. Green light will be absorbed through the red filter during the process of exiting the display panel and cannot exit the display panel. Therefore, the second organic light emitting unit 22 will exhibit a non-light emitting state at the corresponding position in the temperature sensing region Ts. That is, in the temperature sensing region Ts, the microcavity structure formed by the second organic light emitting unit 22 and the optical filter 3 together form a light suppressing structure, and the two cooperate to suppress the light emission of the temperature sensing region Ts.
Illustratively, the display panel further includes a pixel definition layer. As shown in fig. 3, in the temperature sensing region Ts, the pixel defining layer 4 includes an opening 40, and the second light emitting layer 220 is located in the opening 40. The opening 40 includes a first region 401 and a second region 402, the second region 402 surrounding the first region 401. In the first region 401, the thickness of the pixel defining layer 4 is 0. In the second region 402, the pixel defining layer 4 is located between the second light emitting layer 220 and the second transparent electrode 221 in a direction perpendicular to the plane of the display panel.
In preparing the light emitting structure including the first and second organic light emitting units 21 and 22, patterned reflective and transparent electrodes are generally prepared first. And forming a pixel definition layer material with a whole layer structure on the transparent electrode, and then forming the opening in the pixel definition layer material through patterning processes such as etching. The light emitting layer may then be formed corresponding to the opening. As shown in fig. 3, the opening has an inverted trapezoidal cross-sectional shape as shown in fig. 3. That is, the area of the opening on the side away from the substrate 1 is large, and the area of the opening on the side close to the substrate 1 is small. That is, the sidewall of the opening has a thickness gradient: the closer to the center of the opening, the smaller the film thickness of the sidewall. Here, the sidewall of the opening corresponds to the second region 402. The completely etched-out region of the pixel defining layer 4 corresponds to the first region 401.
In the first region 401, the gain wavelength λ2 of the microcavity satisfies:
λ2＝A×n×d×cosθ+B (1)
wherein A and B are constants associated with the microcavities. A and B are fixed constants after the thickness and refractive index of each film layer including the light emitting layer and the light emitting functional layer in the microcavity device are determined. n is the refractive index of the second transparent electrode 221; d is the thickness of the second transparent electrode 221; θ is an angle between the light emitting direction of the second organic light emitting unit 22 and the normal line of the display panel.
When the minimum value of the transmission band of the optical filter 3 is λ11 and the maximum value of the transmission band is λ12, in the embodiment of the present invention, the gain wavelength λ2 of the microcavity corresponding to the first region 401 further satisfies:
λ2＞λ12 (2)
alternatively, the gain wavelength λ2 of the microcavity corresponding to the first region 401 further satisfies:
λ2＜λ11 (3)
that is, the gain band of the microcavity corresponding to the first region 401 is shifted from the transmission band of the optical filter 3 correspondingly disposed, so that the light emitted from the first region 401 can be absorbed by the optical filter 3 correspondingly after being emitted, and cannot be emitted.
Because the thicknesses of the definition layers of the pixels located in the second region 402 are different at different positions, and taking into account that the microcavity has periodicity to the gain of the light wave, the embodiment of the invention provides the calculation formulas of the first microcavity gain band and the second microcavity gain band of the second region 402 under different periods, and makes the first microcavity gain band and the second microcavity gain band avoid the transmission band of the corresponding optical filter 3, so as to ensure that the second region 402 does not emit light.
In the second region 402, the microcavity is capable of resonance enhancement of light in a first gain band, the first gain band λ31 satisfying:
wherein the value of A, B, n, d is consistent with the formula (1). d, d pdl Defining a thickness of the layer at any location for the pixels in the second region 402;defining a side of the layer at an arbitrary position for a pixel in the second regionThe wall of the pixel defining layer surrounds the opening.
In the embodiment of the present invention, the first gain band λ31 of the microcavity corresponding to the second region 402 further satisfies:
λ31＞λ12 (5)
alternatively, the first gain band λ31 of the microcavity corresponding to the second region 402 also satisfies:
λ31＜λ11 (6)
that is, the first gain band of the microcavity corresponding to the second region 402 is shifted from the transmission band of the corresponding optical filter 3, so that the light emitted from the second region 402 and located in the first gain band is absorbed by the corresponding optical filter 3 and cannot be emitted.
In the second region 402, the microcavity is also capable of resonance enhancement for light in a second gain band range, the second gain band λ32 satisfying:
λ32＝C×λ31+D (7)
wherein C and D are constants associated with the microcavities. After the thickness and refractive index of each film layer including the light emitting layer and the light emitting functional layer in the microcavity device are determined, C and D are fixed constants.
In the embodiment of the present invention, the second gain band λ32 of the microcavity corresponding to the second region 402 further satisfies:
λ32＞λ12 (8)
alternatively, the second gain band λ32 of the microcavity corresponding to the second region 402 also satisfies:
λ32＜λ11 (9)
that is, the second gain band of the microcavity corresponding to the second region 402 is shifted from the transmission band of the corresponding optical filter 3, so that the light emitted from the second region 402 and located in the second gain band is absorbed by the corresponding optical filter 3 and cannot be emitted.
In designing the second organic light emitting unit 22, the embodiment of the present invention may determine the transmission band of the filter 3, and then determine the thickness of the second transparent electrode 221 and the thickness of the pixel defining layer 4 in the second region 402 according to the selected filter 3 and by solving the above six inequalities of equations (2), (3), (5), (6), (8) and (9) through programming.
In addition, after the first gain band corresponding to the second region 402 is calculated, the embodiment of the present invention may further directly calculate the second gain band according to the above formula (7), and when the microcavity parameter of the second organic light emitting unit 22 is designed to ensure that the temperature sensing region Ts does not emit light, the calculation process may be greatly simplified.
The first gain band corresponds to a second period of the microcavity at the second region 402, and the second gain band corresponds to a third period of the microcavity at the second region 402. Referring to fig. 4, fig. 4 is a graph showing a relationship between a cavity length and a gain wavelength in a second region, where the first gain band corresponding to the second period and the second gain band corresponding to the third period are located in a range of a visible band (400 nm to 700 nm) of the human eye, and the gain bands corresponding to the first period and the fourth period are located outside the visible band of the human eye.
Alternatively, in the embodiment of the present invention, the transmission color of the filter 3 may be red or blue. Compared with the green filter, the transmission wave bands of the red filter and the blue filter are narrower, so that the filter corresponding to the second organic light emitting unit 22 is set to be the red filter or the blue filter, light with a wider wave band emitted from the second organic light emitting unit 22 can be absorbed and cannot be emitted, and the light leakage problem of the temperature sensing region Ts is more favorable to be improved.
For example, when the transmission color of the filter 3 is red, according to the above formulas (1) to (9), the embodiment of the present invention may make the thickness d of the second transparent electrode 221 satisfy:or (I)>
For example, the transmission color of the above filter 3 may be green, in which case the thickness d of the second transparent electrode 221 satisfies:
in the embodiment of the invention, the transmission color of the optical filter 3 is red, that is, the minimum value of the transmission band is 580nm, the maximum value of the transmission band is 700nm, the thickness d of the second transparent electrode 221 is 250nm, the refractive index of the second transparent electrode 221 is 1.9, a=0.44, b=348, c=0.349, d=170.6, θ=0,the calculation is performed on the first gain band and the second gain band corresponding to the microcavity formed by the second region 402 and the gain band corresponding to the microcavity formed by the first region 401, and the results are shown in table 1 and fig. 5, and fig. 5 is a schematic diagram of the cavity lengths and the gain bands of the first region and the second region. Wherein the microcavities formed corresponding to the second regions 402 respectively calculate and illustrate gain bands at the thickness locations of the plurality of different pixel definition layers.
TABLE 1
As can be seen from table 1 and fig. 5, the gain band of the first region 401 is 766nm, which is greater than the maximum value 700nm of the transmission band of the filter 3. The first gain band of the second region 402 is between 773nm and 931nm, which is also greater than the maximum 700nm of the transmission band of the filter 3. The second gain band of the second region 402 is between 510nm and 579nm, which is smaller than the minimum 580nm of the transmission band of the filter 3. That is, the gain band of the first region and the gain band of the second region do not overlap with the transmission band of the filter 3, and it is achieved that neither the first region 401 nor the second region 402 emits light.
Alternatively, in the embodiment of the present invention, the materials of the first light emitting layer 210 and the second light emitting layer 220 may be the same. Both of which can be selected as luminescent materials having a broad emission spectrum. Illustratively, in embodiments of the present invention, the first light emitting layer 210 and the second light emitting layer 220 may each include a white light emitting layer. When the display panel displays, the white light emitted by the first light emitting layer 210 emits light with a specific color after being emitted by the corresponding optical filter 3. In addition, the first light-emitting layer 210 and the second light-emitting layer 220 can be prepared by using an Open Mask (Open Mask), so that the process difficulty of the high-resolution display panel can be reduced, and the prepared display panel can meet the high-resolution display requirement of AR (Augmented Reality) or VR (Virtual Reality) display equipment.
Alternatively, embodiments of the present invention may also select a single color luminescent material when the first luminescent layer 210 and/or the second luminescent layer 220 are provided. For example, the first light emitting layer 210 or the second light emitting layer 220 may be any one of a red light emitting material emitting red light, a blue light emitting material emitting blue light, and a green light emitting material emitting green light.
When the monochromatic light emitting material is selected to form the first light emitting layer 210, the thickness h of the first transparent electrode 211 may be adjusted so that the microcavity of the first organic light emitting unit 21 satisfies the overlapping of the gain band and the light emitting band of the first light emitting layer 210. For example, when the red light emitting material is selected as the first light emitting layer 210, the embodiment of the present invention can match the gain wavelength of the microcavity with the spectral peak value of the red light emitting material, so as to enhance the resonance of the red light, weaken the light intensity at other wavelengths, narrow the emission spectrum of the first organic light emitting unit 21, and improve the color purity of the light emitting color of the first organic light emitting unit 21. In the embodiment of the invention, the light-emitting band of the light-emitting layer refers to a peak band in the light-emitting spectrum of the light-emitting layer.
For example, when a plurality of sub-pixels with different colors are disposed in the display area AA, as shown in fig. 6, fig. 6 is a schematic cross-sectional view of a display area of another display panel provided in the embodiment of the present invention, taking the first color light-emitting layer 2101, the second color light-emitting layer 2102 and the third color light-emitting layer 2103 disposed in the display area AA as an example, the embodiment of the present invention may perform differential setting on thicknesses of the first transparent electrodes corresponding to the first color light-emitting layer 2101, the second color light-emitting layer 2102 and the third color light-emitting layer 2103, as shown in fig. 6, so that the thickness h1 of the first transparent electrode 2111 corresponding to the first color light-emitting layer 2101, the thickness h2 of the first transparent electrode 2113 corresponding to the second color light-emitting layer 2102 and the thickness h3 of the first transparent electrode 2113 corresponding to the third color light-emitting layer 2103 are different from each other, so as to match gain bands of microcavities of the respective sub-pixels with light-emitting spectra of the respective corresponding light-emitting layers. For example, the first color may be red, the second color may be green, and the third color may be blue.
It should be noted that, based on the arrangement of fig. 6, an optical filter may be further disposed on a side of the first light emitting layer 210 away from the substrate 1, and a transmission band of the optical filter may be matched with a light emitting spectrum of the first light emitting layer 210, so as to further improve the light emitting color purity of the display area AA.
When the monochromatic light emitting material is selected to form the second light emitting layer 220, the thickness of the second transparent electrode may be adjusted in the embodiment of the present invention, so that the microcavity of the second organic light emitting unit 22 satisfies that the gain band does not overlap with the light emitting band of the second light emitting layer 220. For example, when a red light emitting material is selected as the second light emitting layer 220, the embodiment of the present invention may make the gain wavelength of the microcavity not overlap with the spectral peak of the red light emitting material. When the temperature of the display area AA is fed back by the second organic light emitting unit 22, the light within the red light band emitted by the second light emitting layer 220 is suppressed because the microcavity resonance condition is not met, so as to achieve the effect of suppressing the decrease in the light output intensity of the temperature sensing area Ts, even without light output.
As shown in fig. 7, in an example, in fig. 7, a schematic cross-sectional view of a temperature sensing region of another display panel according to an embodiment of the present invention, taking the above-mentioned second light-emitting layer 220 including the fourth color light-emitting layer 2201, the fifth color light-emitting layer 2202 and the sixth color light-emitting layer 2203 as an example, the embodiment of the present invention may set the thicknesses of the second transparent electrodes corresponding to the fourth color light-emitting layer 2201, the fifth color light-emitting layer 2202 and the sixth color light-emitting layer 2203 differently, as shown in fig. 7, so that the thickness d1 of the second transparent electrode 2211 corresponding to the fourth color light-emitting layer 2201, the thickness d2 of the second transparent electrode 2212 corresponding to the fifth color light-emitting layer 2202 and the thickness d3 of the second transparent electrode 2213 corresponding to the sixth color light-emitting layer 2203 are different from each other, so that the gain bands of the microcavities of the subpixels do not overlap with the light emission spectra of the respective second light-emitting layers. The fourth color, the fifth color, and the sixth color may be any one of red, green, and blue, respectively.
It should be noted that, based on the arrangement of fig. 7, a filter may be further disposed on a side of the first light emitting layer 220 away from the substrate 1, and the transmission band of the filter may not overlap with the gain band of the microcavity of the second organic light emitting unit, so as to ensure that the light emitted from the second organic light emitting unit 22 does not transmit through the filter.
As shown in fig. 7, in the temperature sensing region Ts, the pixel defining layer 4 includes an opening 40, and the second light emitting layer 220 is located in the opening 40. The opening 40 includes a first region 401 and a second region 402, the second region 402 surrounding the first region 401. In the first region 401, the thickness of the pixel defining layer 4 is 0. In the second region 402, the pixel defining layer 4 is located between the second light emitting layer 220 and the second transparent electrode 221 in a direction perpendicular to the plane of the display panel.
As described above, in the first region 401, the gain wavelength λ2 of the microcavity satisfies the above formula (1).
When the minimum value of the light emitting band of the second light emitting layer 220 is λ41 and the maximum value of the light emitting band is λ42, in the embodiment of the present invention, the gain wavelength λ2 of the microcavity corresponding to the first region 401 further satisfies:
λ2＞λ42 (10)
alternatively, the gain wavelength λ2 of the microcavity corresponding to the first region further satisfies:
λ2＜λ41 (11)
that is, the gain band of the microcavity corresponding to the first region 401 is staggered from the light emitting band of the second light emitting layer 220 correspondingly disposed, so that the light emitted from the second light emitting layer 220 located in the first region 401 can decrease the light emitting intensity after passing through the microcavity.
In the second region 402, the first gain band λ31 of the microcavity satisfies the above equation (4). In the embodiment of the present invention, the first gain band λ31 of the microcavity corresponding to the second region 402 further satisfies:
λ31＞λ42 (12)
alternatively, the first gain band λ31 of the microcavity corresponding to the second region 402 satisfies:
λ31＜λ41 (13)
that is, the first gain band of the microcavity corresponding to the second region 402 is staggered from the light emitting band of the second light emitting layer 220 correspondingly disposed, so that the light emitted from the second light emitting layer 220 located in the second region 402 can have a reduced light emitting intensity after passing through the microcavity.
In the second region 402, the second gain band λ32 of the microcavity satisfies the above equation (7). In the embodiment of the present invention, the second gain band λ32 of the microcavity corresponding to the second region 402 further satisfies:
λ32＞λ12 (14)
alternatively, the second gain band λ32 of the microcavity corresponding to the second region 402 also satisfies:
λ32＜λ11 (15)
that is, the second gain band of the microcavity corresponding to the second region 402 is staggered from the light emitting band of the second light emitting layer 220 correspondingly disposed, so that the light emitted from the second light emitting layer 220 located in the second region 402 can have a reduced light emitting intensity after passing through the microcavity.
The display panel may be a silicon-based display panel, for example. The silicon-based display panel includes a CMOS integrated circuit therein. The OLED display panel with higher pixel density can be manufactured by utilizing the silicon-based semiconductor CMOS process, so that the high-resolution display requirement of AR (Augmented Reality) or VR (Virtual Reality) display equipment is met.
The first organic light emitting unit 21 and the second organic light emitting unit 22 may further include a light emitting functional layer including one or more of an electron injection layer, an electron transport layer, a hole transport layer, and a hole injection layer. The light emitting functional layer may have a whole layer structure, that is, the light emitting functional layer may extend from the display area AA to the temperature sensing area Ts.
The embodiment of the invention also provides a display device, as shown in fig. 8, fig. 8 is a schematic diagram of the display device according to the embodiment of the invention, where the display device includes the display panel 100 described above. The specific structure of the display panel 100 is described in detail in the above embodiments, and will not be described here again. Of course, the display device shown in fig. 8 is merely a schematic illustration, and the display device may be any electronic device having a display function, such as a mobile phone, a tablet computer, a notebook computer, an electronic book, a television, a vehicle-mounted display screen, an augmented Reality (Augmented Reality, abbreviated as AR) device, or a Virtual Reality (VR) device.
According to the display device provided by the embodiment of the invention, the thickness of the second transparent electrode is different from that of the first transparent electrode, so that the lengths of the microcavities of the first organic light-emitting unit and the second organic light-emitting unit are different, the microcavity effect can exert different influences on the first organic light-emitting unit and the second organic light-emitting unit, the light-emitting intensity of the first organic light-emitting unit is enhanced, the light-emitting intensity of the second organic light-emitting unit is inhibited, and for example, the temperature sensing area does not emit light or the light-emitting brightness of the temperature sensing area is low. The temperature detection is performed by using the second organic light emitting unit, and meanwhile, the display effect of the display panel is not affected.
In addition, by adopting the design mode, the thicknesses of the first transparent electrode and the second transparent electrode are only required to be different, and other film layers in the display panel, such as the materials of the first reflecting electrode and the second reflecting electrode, and the thicknesses and the materials of the third electrode and the fourth electrode, can be set to be the same, so that the process is simple. The temperature sensing area Ts is not required to be additionally provided with a black matrix or other shading structures for shading while not emitting light, so that the process complexity of the display panel can be prevented from being increased.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the invention.
Claims (14)
1. A display panel, comprising a substrate; the substrate comprises a display area and a temperature sensing area;
the display region includes a first organic light emitting unit; the first organic light emitting unit includes a first light emitting layer, a first transparent electrode, and a first reflective electrode; the first transparent electrode is positioned at one side of the first reflecting electrode away from the substrate, and the first light-emitting layer is positioned at one side of the first transparent electrode away from the first reflecting electrode;
the temperature sensing region comprises a temperature sensor, and the temperature sensor comprises a second organic light emitting unit; the second organic light emitting unit includes a second light emitting layer, a second transparent electrode, and a second reflective electrode; the second transparent electrode is positioned at one side of the second reflecting electrode away from the substrate, and the second light-emitting layer is positioned at one side of the second transparent electrode away from the second reflecting electrode;
the thickness of the second transparent electrode is different from the thickness of the first transparent electrode.
2. The display panel of claim 1, wherein the display panel comprises,
the temperature sensing area comprises an optical filter; the optical filter at least partially overlaps the second light-emitting layer along a direction perpendicular to a plane of the substrate;
the second organic light emitting unit is provided with a microcavity, and a gain band of the microcavity is not overlapped with a transmission band of the optical filter.
3. The display panel of claim 2, wherein the display panel comprises,
the minimum value of the transmission wave band of the optical filter is lambda 11, and the maximum value of the transmission wave band of the optical filter is lambda 12;
the temperature sensing region further comprises a pixel defining layer, the pixel defining layer comprises an opening, and the second light emitting layer is positioned in the opening;
the opening comprises a first region and a second region, the second region surrounds the first region, and the thickness of the pixel definition layer is 0 in the first region; in the second region, the pixel defining layer is located between the second light emitting layer and the second transparent electrode;
in the first region, the gain wavelength λ2 of the microcavity satisfies: λ2=a×n×d×cos θ+b; wherein A and B are constants; n is the refractive index of the second transparent electrode; d is the thickness of the second transparent electrode; θ is an included angle between the light emitting direction of the second organic light emitting unit and the normal line of the display panel;
λ2 > λ12, or λ2 < λ11.
4. The display panel according to claim 3, wherein,
in the second region, the microcavity includes a first gain band;
the first gain band λ31 satisfies: λ31=a×n× (d+d pdl ) X cos (θ+φ) +B; wherein d pdl Defining a thickness of the layer at any location for the pixel in the second region; phi is an included angle between the side wall of the pixel definition layer at any position in the second region and the plane where the display panel is located, and the side wall of the pixel definition layer surrounds the opening;
λ31 > λ12, or λ31 < λ11.
5. The display panel of claim 4, wherein the display panel comprises,
in the second region, the microcavity further includes a second gain band;
the second gain band λ32 satisfies: λ32=c×λ31+d; wherein C and D are constants;
λ32 > λ12, or λ32 < λ11.
6. The display panel of claim 2, wherein the display panel comprises,
the transmission color of the filter is red or blue.
7. The display panel of claim 6, wherein the display panel comprises,
the transmission color of the optical filter is red, and the thickness d of the second transparent electrode meets the following conditions:
d <40 a, or, 215 a < d <280 a.
8. The display panel of claim 6, wherein the display panel comprises,
the transmission color of the optical filter is green, and the thickness d of the second transparent electrode meets the following conditions: d >260 a.
9. The display panel according to any one of claims 1 to 8, wherein,
the second light emitting layer includes a white light emitting layer.
10. The display panel according to claim 3, wherein,
the second organic light emitting unit is provided with a microcavity, and the gain wave band of the microcavity is not overlapped with the light emitting wave band of the second light emitting layer.
11. The display panel of claim 10, wherein the display panel comprises,
the minimum value of the light-emitting wave band of the second light-emitting layer is lambda 41, and the maximum value of the light-emitting wave band of the second light-emitting layer is lambda 42;
the pixel defining layer includes an opening, and the second light emitting layer is located in the opening;
the opening includes a first region in which the thickness of the pixel defining layer is 0 and a second region in which the pixel defining layer is located between the second light emitting layer and the second transparent electrode;
in the first region, the gain wavelength λ2 of the microcavity satisfies: λ2=a×n×d×cos θ+b; wherein A and B are constants; n is the refractive index of the second transparent electrode; d is the thickness of the second transparent electrode, and θ is the included angle between the light emitting direction of the second organic light emitting unit and the normal line of the display panel;
λ2 > λ42, or λ2 < λ41.
12. The display panel of claim 11, wherein the display panel comprises,
in the second region, the microcavity includes a first gain band;
the first gain band λ31 satisfies: λ31=a×n× (d+d pdl ) X cos (θ+φ) +B; wherein d pdl Defining a thickness of the layer at any location for the pixel in the second region; phi is an included angle between the side wall of the pixel defining layer and the plane of the display panel in the second area, and the side wall of the pixel defining layer surrounds the opening;
λ31 > λ42, or λ31 < λ41.
13. The display panel of claim 12, wherein the display panel comprises,
in the second region, the microcavity further includes a second gain band;
the second gain band λ32 satisfies: λ32=c×λ31+d; wherein C and D are constants;
λ32 > λ12, or λ32 < λ11.
14. A display device comprising the display panel of any one of claims 1-13.
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