CN114171697A - Display panel and display device - Google Patents
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- CN114171697A CN114171697A CN202111298953.7A CN202111298953A CN114171697A CN 114171697 A CN114171697 A CN 114171697A CN 202111298953 A CN202111298953 A CN 202111298953A CN 114171697 A CN114171697 A CN 114171697A
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- H10K50/00—Organic light-emitting devices
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- 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
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- 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
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- 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 on one side of the first reflecting electrode, which is far away from the substrate, and the first light-emitting layer is positioned on one side of the first transparent electrode, which is far away from the first reflecting electrode; the temperature sensing area 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 on one side of the second reflecting electrode, which is far away from the substrate, and the second luminescent layer is positioned on one side of the second transparent electrode, which is 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
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of display, in particular to a display panel and a display device.
[ background of the invention ]
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 at present. Moreover, with the continuous development of display technologies, the requirements of consumers for displays are continuously increasing, and various displays are developed in a wide range, and display technologies such as liquid crystal display, organic light emitting display, and the like are developed. On the basis, technologies such as 3D display, touch display, curved surface display, and ultrahigh resolution display are also emerging.
An Organic Light-Emitting Diode (OLED) display panel is widely used in the display technology field because of its advantages of active Light emission, high contrast, no viewing angle limitation, and the like. Since the IV characteristic of the OLED varies with temperature, and the variation of the IV characteristic causes the brightness of the OLED to vary, the screen is required to have a temperature compensation capability. It is now common practice to provide a temperature sensor in the display panel, which includes 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 temperature sensor emits light during the temperature feedback process, which affects the normal display of the OLED display panel.
[ summary of the invention ]
In view of this, embodiments of the present invention provide a display panel and a display device, so as to solve the problem of light leakage of a temperature sensor in the prior art and ensure normal display of the display panel.
In one aspect, embodiments of the present invention provide 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 on one side of the first reflecting electrode, which is far away from the substrate, and the first light-emitting layer is positioned on one side of the first transparent electrode, which is far away from the first reflecting electrode;
the temperature sensing area 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 on one side of the second reflecting electrode, which is far away from the substrate, and the second light-emitting layer is positioned on one side of the second transparent electrode, which is far away from the second reflecting electrode;
the thickness of the second transparent electrode is different from the thickness of the first transparent electrode.
In another aspect, an embodiment of the present invention provides a display device, including the display panel described above.
According to the display panel and the display device provided by the embodiment of the invention, the lengths of the micro-cavities of the first organic light-emitting unit and the second organic light-emitting unit can be different by making the thickness of the second transparent electrode different from that of the first transparent electrode, so that the micro-cavity effect exerts 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 suppressed, and for example, the temperature sensing area can not emit light or the light-emitting brightness of the temperature sensing area can be low. When the second organic light-emitting unit is used for detecting the temperature, the display effect of the display panel is not affected.
Moreover, by adopting the design mode, only the thicknesses of the first transparent electrode and the second transparent electrode are required to be different, and other film layers in the display panel, such as the thicknesses and the materials of the first reflective electrode and the second reflective 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. When the temperature sensing area Ts is ensured not to emit light, a black matrix or other shading structures for shading are not required to be additionally arranged corresponding to the temperature sensing area, and the process complexity of the display panel can be avoided being increased.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used 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 it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic top view of a display panel according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional view of a display area of a display panel according to an embodiment of the invention;
fig. 3 is a schematic cross-sectional view of a temperature sensing area of a display panel according to an embodiment of the invention;
FIG. 4 is a plot of cavity length versus gain wavelength for a second region;
FIG. 5 is a schematic diagram of the cavity length and gain band for a first region and a 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 ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. 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 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 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 in the embodiment of the present invention, fig. 2 is a schematic cross-sectional view of a display area of the display panel provided in 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 in 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 on a side of the first reflective electrode 212 away from the substrate 1, and the first light emitting layer 210 is located on a side of the first transparent electrode 211 away 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 on a side of the second reflective electrode 222 away from the substrate 1, and the second light emitting layer 220 is located on 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, and the third electrode 213 is located on a side of the first light emitting layer 210 away from the substrate 1. Alternatively, the third electrode 213 may be a semi-transparent and semi-reflective electrode, and a micro-cavity 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 on a side of the second light emitting layer 220 away from the substrate 1. Alternatively, the fourth electrode 223 may be a semi-transparent counter electrode, and a micro-cavity 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 organic light emitting unit 21 and the second organic light emitting unit 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 a 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 transparent metal oxides, such as Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), and 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 also be formed by selecting a metal material.
For example, 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 excited 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 excited to emit light.
In the embodiment of the present invention, the thickness d of the second transparent electrode 221 is different from the thickness h of the first transparent electrode 211.
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. When the first and second transparent electrodes 211 and 221 having different thicknesses are prepared, a half gray scale Mask (Halftone Mask) may be used. So configured, the second organic light emitting unit 22 may be enabled to accurately feed back the temperature of the display area AA where the first organic light emitting unit 21 is disposed. 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 may 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 as to implement temperature compensation for the display panel, eliminate the influence of the 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 spectral peak 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 microcavity length, in the embodiment of the present invention, the first organic light-emitting unit 21 and the second organic light-emitting unit 22 can 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 exerts different effects on the light emission of the first organic light-emitting unit 21 and the second organic light-emitting unit 22, so that the light emission of the display area AA corresponding to the first organic light-emitting unit 21 in the display panel is enhanced, and the light emission of the temperature sensing area Ts corresponding to the second organic light-emitting unit 22 in the display panel is suppressed. By adopting the setting mode of the embodiment of the invention, the temperature sensing area Ts can not emit light or can have lower light-emitting brightness while the second organic light-emitting unit 22 is used for sensing the temperature, thereby ensuring that the display effect of the display panel is not influenced.
Moreover, by adopting the design mode, only the thicknesses of the first transparent electrode and the second transparent electrode are required to be different, and other film layers in the display panel, such as the thicknesses and the materials of the first reflective electrode and the second reflective 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. When the temperature sensing area Ts is ensured not to emit light, a black matrix or other shading structures for shading are not required to be additionally arranged corresponding to the temperature sensing area, and the process complexity of the display panel can be avoided 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 an illustration, and when designing the display panel, the positions of the display area AA and the temperature sensing area Ts may be set according to different design requirements, 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 an optical filter 3. In the display area AA, the filter 3 is located on a side of the first organic light emitting unit 21 away from the substrate 1. In the temperature sensing region Ts, the filter 3 is located on a side of the second organic light emitting unit 22 away from the substrate 1. As shown in fig. 2 and 3, the filter 3 at least partially overlaps the first and second light emitting layers 210 and 220, respectively, in a direction perpendicular to the plane of the substrate 1.
Illustratively, the filters 3 may have different colors of light emission at positions corresponding to different color sub-pixels. The filter 3 having a certain light emission color can allow only light of a specific wavelength to pass through 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, when designing the first organic light emitting unit 21, the embodiment of the invention may adjust the thickness h of the first transparent electrode 211, so that the microcavity of the first organic light emitting unit 21 satisfies that the gain band overlaps the transmission band of the corresponding filter 3.
When the second organic light emitting unit 22 is disposed, the embodiment of the invention may adjust the thickness d of the second transparent electrode 221, so that the microcavity of the second organic light emitting unit 22 satisfies that the gain band is not overlapped with the transmission band of the corresponding filter 3. For example, for the second organic light emitting unit 22 disposed corresponding to the red filter, the embodiment of the invention may adjust the thickness of the second transparent electrode 221 in the second organic light emitting unit 22, so that the gain band of the microcavity of the second organic light emitting unit 22 is the green band or the blue band. Taking the example that the gain wavelength band of the microcavity falls within the green wavelength band, when the temperature of the display area AA is fed back by the second organic light emitting unit 22, the light emitted by the second light emitting layer 220 in the green wavelength band is enhanced because of meeting the microcavity resonance condition, and the light in other wavelength bands is suppressed because of not meeting the microcavity resonance condition. Therefore, the light emitted from the second organic light emitting unit 22 will be mainly green light. The green light is absorbed by the red filter and cannot exit the display panel in the process of exiting the display panel. Therefore, the position corresponding to the second organic light emitting unit 22 in the temperature sensing region Ts will exhibit a non-light emitting state. That is, in the temperature sensing region Ts, the microcavity structure formed by the second organic light emitting unit 22 and the filter 3 together form a light suppressing structure, and the microcavity structure and the filter cooperate with each other to suppress light emission from the temperature sensing region Ts.
Illustratively, the display panel further includes a pixel defining 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 organic light emitting unit 21 and the second organic light emitting unit 22, it is general to first prepare a patterned reflective electrode and a transparent electrode. And forming a pixel definition layer material with a whole-layer structure on the transparent electrode, and opening the opening in the pixel definition layer material by a patterning process such as etching. A light emitting layer may then be formed corresponding to the opening. As shown in fig. 3, the opening has an inverted trapezoidal sectional shape as shown in fig. 3. That is, the area of the side of the opening remote from the substrate 1 is large, and the area of the side close to the substrate 1 is small. That is, the sidewall of the opening has a gradual thickness change: the closer to the center of the opening, the smaller the film thickness of the side wall. 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 λ 2 of the microcavity satisfies:
λ2＝A×n×d×cosθ+B (1)
where A and B are constants associated with the microcavity. 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, a and B are fixed constants. n is a 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 of the display panel.
When the minimum value of the transmission band of the filter 3 is λ 11 and the maximum value of the transmission band is λ 12, in the embodiment of the present invention, the gain wavelength λ 2 of the microcavity corresponding to the first region 401 further satisfies:
λ2＞λ12 (2)
alternatively, the gain wavelength λ 2 of the microcavity corresponding to the first region 401 further satisfies:
λ2＜λ11 (3)
that is, the gain wavelength band of the microcavity corresponding to the first region 401 is shifted from the transmission wavelength band of the filter 3 provided correspondingly, so that light emitted from the first region 401 can be absorbed by the corresponding filter 3 after being emitted and cannot be emitted.
Because the thicknesses of the pixel defining layers in the second region 402 at different positions are different, and in consideration of the periodicity of the gain of the microcavity to the light wave, the embodiment of the present invention provides calculation formulas of the first microcavity gain band and the second microcavity gain band of the second region 402 at different periods, respectively, and makes the first microcavity gain band and the second microcavity gain band avoid the transmission bands of the corresponding optical filters 3, so as to ensure that no light is emitted at the second region 402.
In the second region 402, the microcavity is capable of resonance-enhancing light located in a first gain band range, the first gain band λ 31 satisfying:
wherein, the values of A, B, n and d are consistent with the formula (1). dpdlDefining the thickness of the layer at any location for the pixels in the second region 402;
and an included angle between the side wall of the pixel definition layer at any position in the second area and the plane of the display panel is defined, and the side wall of the pixel definition layer surrounds the opening.
In the embodiment of the present invention, the first gain band λ 31 of the microcavity corresponding to the second region 402 further satisfies:
λ31＞λ12 (5)
alternatively, the first gain band λ 31 of the microcavity corresponding to the second region 402 further satisfies:
λ31＜λ11 (6)
that is, the first gain wavelength band of the microcavity corresponding to the second region 402 is shifted from the transmission wavelength band of the filter 3 provided correspondingly, so that the light in the first gain wavelength band emitted from the second region 402 is absorbed by the corresponding filter 3 and is not emitted.
In the second region 402, the microcavity is also capable of resonance-enhancing light in a second gain band, where λ 32 satisfies:
λ32＝C×λ31+D (7)
where C and D are constants associated with the microcavity. C and D 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.
In the embodiment of the present invention, the second gain band λ 32 of the microcavity corresponding to the second region 402 further satisfies:
λ32＞λ12 (8)
alternatively, the second gain band λ 32 of the microcavity corresponding to the second region 402 further satisfies:
λ32＜λ11 (9)
that is, the second gain wavelength band of the microcavity corresponding to the second region 402 is shifted from the transmission wavelength band of the filter 3 provided correspondingly, so that light in the second gain wavelength band emitted from the second region 402 is absorbed by the corresponding filter 3 and is not emitted.
In designing the second organic light emitting unit 22, the embodiment of the invention may first determine the transmission wavelength 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-mentioned six inequalities (2), (3), (5), (6), (8) and (9).
Moreover, in the embodiment of the present invention, after the first gain band corresponding to the second region 402 is obtained through calculation, the second gain band can be directly obtained through calculation 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 can 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, it can be seen that fig. 4 is a graph of a relation between a cavity length and a gain wavelength of the second region, where a first gain band corresponding to the second period and a second gain band corresponding to the third period are located within a range of a visible band (400nm to 700nm) of human eyes, and the gain bands corresponding to the first period and the fourth period are outside the visible band of human eyes, therefore, in the embodiment of the present invention, only the first gain band corresponding to the second period and the second gain band corresponding to the third period can be calculated, so that the first gain band and the second gain band respectively satisfy the above equations (5), (6), (8) and (9), 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 can be simplified.
Optionally, in the embodiment of the present invention, the transmission color of the filter 3 may be red or blue. Compared with a green filter, the red filter and the blue filter have narrower transmission bands, so that, in the embodiment of the present invention, the filter disposed corresponding to the second organic light emitting unit 22 is set as the red filter or the blue filter, light in a wider band emitted from the second organic light emitting unit 22 can be absorbed and cannot be emitted, which is more favorable for improving the light leakage problem of the temperature sensing region Ts.
For example, when the transmission color of the filter 3 is red, according to the above equations (1) to (9), the embodiment of the present invention may make the thickness d of the second transparent electrode 221 satisfy:
or the like, or, alternatively,
for example, the transmission color of the filter 3 may be green, in which case the thickness d of the second transparent electrode 221 satisfies:
in the embodiment of the present invention, the color transmitted through the filter 3 is red, that is, the minimum value of the transmission wavelength band is 580nm, the maximum value of the transmission wavelength 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 is 0.44, B is 348, C is 0.349, D is 170.6, and θ is 0,
the first and second gain bands of the microcavity formed corresponding to the second region 402 and the gain band of the microcavity formed corresponding to the first region 401 are calculated, and the results are shown in table 1 and fig. 5, where fig. 5 is a schematic diagram of the cavity length and the gain band of the first and second regions. Wherein the microcavities formed corresponding to the second region 402 respectively calculate and illustrate gain bands at a plurality of different pixel defining layer thickness positions.
TABLE 1
As can be seen from table 1 and fig. 5, the gain band of the first region 401 is 766nm, which is larger than the maximum 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 larger than the maximum 700nm of the transmission band of the filter 3. The second gain waveband of the second region 402 is between 510nm and 579nm, which is smaller than the minimum value 580nm of the transmission waveband of the optical filter 3. That is, the gain band of the first region and the gain band of the second region are not overlapped with the transmission band of the optical filter 3, so that no light is emitted from the first region 401 and the second region 402.
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 select a luminescent material having a broad emission spectrum. Exemplarily, in the embodiment 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 from the first light emitting layer 210 emits light of a specific color after being emitted through the corresponding filter 3. Moreover, the first light emitting layer 210 and the second light emitting layer 220 may be prepared by using an Open Mask (Open Mask), which can reduce the process difficulty of the high resolution display panel, and is beneficial to the prepared display panel to meet the high resolution display requirement of ar (amplified real) or vr (virtual real) display equipment.
Alternatively, when the first light-emitting layer 210 and/or the second light-emitting layer 220 are provided, a single color light-emitting material may be selected according to an embodiment of the present invention. For example, the first light-emitting layer 210 or the second light-emitting layer 220 may be made of any one of a red light-emitting material that emits red light, a blue light-emitting material that emits blue light, and a green light-emitting material that emits green light.
When a monochromatic light emitting material is selected to form the first light emitting layer 210, the embodiment of the invention may further adjust the thickness h of the first transparent electrode 211, so that the microcavity of the first organic light emitting unit 21 satisfies that the gain band overlaps with the light emitting band of the first light emitting layer 210. For example, when a red light emitting material is selected as the first light emitting layer 210, the embodiment of the present invention may match the gain wavelength of the microcavity with the spectral peak of the red light emitting material, so as to enhance the resonance of 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 color emitted by the first organic light emitting unit 21. In the embodiment of the present invention, the light emission band of the light emitting layer refers to a peak band in the light emission spectrum of the light emitting layer.
Illustratively, when a plurality of sub-pixels having 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 according to an embodiment of the present invention, taking the first color luminescent layer 2101, the second color luminescent layer 2102 and the third color luminescent layer 2103 as an example, the thickness of the first transparent electrode corresponding to the first color luminescent layer 2101, the second color luminescent layer 2102 and the third color luminescent layer 2103 may be set differently in the embodiment of the present invention, as shown in fig. 6, the thickness h1 of the first transparent electrode 2111 corresponding to the first color luminescent layer 2101, the thickness h2 of the first transparent electrode 2112 corresponding to the second color luminescent layer 2102, and the thickness h3 of the first transparent electrode 2113 corresponding to the third color luminescent layer 2103 are made different from each other, so that the gain band of the microcavity of each sub-pixel matches the emission spectrum of the respective corresponding light-emitting layer. For example, the first color may be red, the second color may be green, and the third color may be blue.
Based on the arrangement manner shown in 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 is 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 embodiment of the invention may further adjust the thickness of the second transparent electrode, so that the microcavity of the second organic light emitting unit 22 satisfies that the gain band is not overlapped 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 emitted by the second light emitting layer 220 in the red light band is suppressed because the light does not meet the microcavity resonance condition, so as to achieve the effect of suppressing the reduction of the light intensity of the temperature sensing area Ts, even preventing the light from being emitted.
For example, as shown in fig. 7, fig. 7 is a schematic cross-sectional view of a temperature sensing region of another display panel provided in an embodiment of the present invention, and taking the second light emitting layer 220 including a fourth color light emitting layer 2201, a fifth color light emitting layer 2202 and a sixth color light emitting layer 2203 as an example, the embodiments of the present invention may provide different 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, as shown in fig. 7, 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 wavelength band of the microcavity of each sub-pixel does not overlap with the emission spectrum of the corresponding second light emitting layer. For example, the fourth color, the fifth color, and the sixth color may be any one of red, green, and blue.
Based on the arrangement of fig. 7, a filter may be disposed on the side of the first light-emitting layer 220 away from the substrate 1, and the transmission wavelength band of the filter and the gain wavelength band of the microcavity of the second organic light-emitting unit are not overlapped, so as to ensure that the light emitted through 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 λ 2 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 λ 41 and the maximum value of the light-emitting band is λ 42, in the embodiment of the present invention, the gain wavelength λ 2 of the microcavity corresponding to the first region 401 further satisfies:
λ2＞λ42 (10)
or, the gain wavelength λ 2 of the microcavity corresponding to the first region further satisfies:
λ2＜λ41 (11)
that is, the gain wavelength band of the microcavity corresponding to the first region 401 is shifted from the light-emitting wavelength band of the second light-emitting layer 220 provided correspondingly, so that the light emitted from the second light-emitting layer 220 located in the first region 401 can be reduced in light-emitting intensity by the microcavity action.
In the second region 402, the first gain band λ 31 of the microcavity satisfies the above equation (4). In the embodiment of the present invention, the first gain band λ 31 of the microcavity corresponding to the second region 402 further satisfies:
λ31＞λ42 (12)
alternatively, the first gain band λ 31 of the microcavity corresponding to the second region 402 satisfies:
λ31＜λ41 (13)
that is, the first gain wavelength band of the microcavity corresponding to the second region 402 and the light-emitting wavelength band of the second light-emitting layer 220 provided correspondingly are shifted so that the light emitted from the second light-emitting layer 220 located in the second region 402 can be reduced in light-emitting intensity by the microcavity action.
In the second region 402, the second gain band λ 32 of the microcavity satisfies the above equation (7). In the embodiment of the present invention, the second gain band λ 32 of the microcavity corresponding to the second region 402 further satisfies:
λ32＞λ12 (14)
alternatively, the second gain band λ 32 of the microcavity corresponding to the second region 402 further satisfies:
λ32＜λ11 (15)
that is, the second gain wavelength band of the microcavity corresponding to the second region 402 is shifted from the light-emitting wavelength band of the second light-emitting layer 220 provided correspondingly, so that the light emitted from the second light-emitting layer 220 located in the second region 402 can be reduced in light-emitting intensity by the microcavity action.
Illustratively, the display panel may be a silicon-based display panel. The silicon-based display panel comprises a CMOS integrated circuit. The OLED display panel with higher pixel density can be manufactured by utilizing a silicon-based semiconductor CMOS process, and the high-resolution display requirement of AR (augmented reality) or VR (virtual reality) display equipment is met.
In addition, the first organic light emitting unit 21 and the second organic light emitting unit 22 may further include a light emitting function layer, and the light emitting function layer includes one or more layers of an electron injection layer, an electron transport layer, a hole transport layer, and a hole injection layer. The light emitting function layer may have an entire layer structure, that is, the light emitting function layer may extend from the display area AA to the temperature sensing area Ts.
As shown in fig. 8, fig. 8 is a schematic view of a display device according to an embodiment of the present invention, where the display device includes the display panel 100. The specific structure of the display panel 100 has been described in detail in the above embodiments, and is not described herein again. Of course, the display device shown in fig. 8 is only a schematic illustration, and the display device may be any electronic device with 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 (AR) device, or a Virtual Reality (VR) device.
In the display device provided by the embodiment of the invention, the thicknesses of the second transparent electrode and the first transparent electrode are different, 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 exerts 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 suppressed, and for example, the temperature sensing area can emit no light or the light emitting brightness of the temperature sensing area is low. When the second organic light-emitting unit is used for detecting the temperature, the display effect of the display panel is not affected.
Moreover, by adopting the design mode, only the thicknesses of the first transparent electrode and the second transparent electrode are required to be different, and other film layers in the display panel, such as the thicknesses and the materials of the first reflective electrode and the second reflective 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. When the temperature sensing area Ts is ensured not to emit light, a black matrix or other shading structures for shading are not required to be additionally arranged corresponding to the temperature sensing area, and the process complexity of the display panel can be avoided being increased.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (14)
1. A display panel includes 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 on one side of the first reflecting electrode, which is far away from the substrate, and the first light-emitting layer is positioned on one side of the first transparent electrode, which is far away from the first reflecting electrode;
the temperature sensing area 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 on one side of the second reflecting electrode, which is far away from the substrate, and the second light-emitting layer is positioned on one side of the second transparent electrode, which is far 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 according to claim 1,
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 the plane of the substrate;
the second organic light-emitting unit is provided with a microcavity, and the gain waveband of the microcavity is not overlapped with the transmission waveband of the optical filter.
3. The display panel according to claim 2,
the minimum value of the transmission waveband of the optical filter is lambda 11, and the maximum value of the transmission waveband of the optical filter is lambda 12;
the temperature sensing area further comprises a pixel defining layer, the pixel defining layer comprises an opening, and the second light emitting layer is located in the opening;
the opening comprises a first area and a second area, the second area surrounds the first area, and the thickness of the pixel defining layer in the first area is 0; 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 λ 2 of the microcavity satisfies: λ 2 ═ axnxnxdxcos 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; theta is an included angle between the light emitting direction of the second organic light emitting unit and the normal of the display panel;
λ 2 > λ 12, or λ 2 < λ 11.
4. The display panel according to claim 3,
in the second region, the microcavity includes a first gain band;
the first gain band λ 31 satisfies:
wherein d ispdlDefining a thickness of the layer at any location for the pixels in the second region;
defining an included angle between the side wall of the pixel definition layer at any position in the second area and the plane of the display panel, wherein the side wall of the pixel definition layer surrounds the opening;
λ 31 > λ 12, or λ 31 < λ 11.
5. The display panel according to claim 4,
in the second region, the microcavity further includes a second gain band;
the second gain band λ 32 satisfies: λ 32 ═ cxλ 31+ D; wherein C and D are constants;
λ 32 > λ 12, or λ 32 < λ 11.
6. The display panel according to claim 2,
the transmission color of the filter is red or blue.
7. The display panel according to claim 6,
the transmission color of the optical filter is red, and the thickness d of the second transparent electrode meets the following requirements:
8. the display panel according to claim 6,
the transmission color of the optical filter is green, and the thickness d of the second transparent electrode meets the following requirements:
9. the display panel according to any one of claims 1 to 8,
the second light emitting layer includes a white light emitting layer.
10. The display panel according to claim 1,
the second organic light-emitting unit is provided with a microcavity, and a gain waveband of the microcavity is not overlapped with a light-emitting waveband of the second light-emitting layer.
11. The display panel according to claim 10,
the minimum value of the light-emitting waveband of the second light-emitting layer is lambda 41, and the maximum value of the light-emitting waveband 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 and a second region, the second region surrounds the first region, the pixel defining layer has a thickness of 0 in the first region, and the pixel defining layer is located between the second light emitting layer and the second transparent electrode in the second region;
in the first region, the gain wavelength λ 2 of the microcavity satisfies: λ 2 ═ axnxnxdxcos 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 theta is an included angle between the light-emitting direction of the second organic light-emitting unit and the normal of the display panel;
λ 2 > λ 42, or λ 2 < λ 41.
12. The display panel according to claim 11,
in the second region, the microcavity includes a first gain band;
the first gain band λ 31 satisfies:
wherein d ispdlDefining a thickness of the layer at any location for the pixels in the second region;
defining an included angle between the side wall of the pixel defining layer in the second area and the plane of the display panel, wherein the side wall of the pixel defining layer surrounds the opening;
λ 31 > λ 42, or λ 31 < λ 41.
13. The display panel according to claim 12,
in the second region, the microcavity further includes a second gain band;
the second gain band λ 32 satisfies: λ 32 ═ cxλ 31+ D; wherein C and D are constants;
λ 32 > λ 12, or λ 32 < λ 11.
14. A display device characterized by comprising the display panel according to any one of claims 1 to 13.
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