CN111834548B - Display panel and display device capable of switching narrow viewing angle - Google Patents
Display panel and display device capable of switching narrow viewing angle Download PDFInfo
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- CN111834548B CN111834548B CN202010653279.9A CN202010653279A CN111834548B CN 111834548 B CN111834548 B CN 111834548B CN 202010653279 A CN202010653279 A CN 202010653279A CN 111834548 B CN111834548 B CN 111834548B
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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
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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
- H10K50/858—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
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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
- H10K59/10—OLED displays
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Abstract
A display panel, comprising: a substrate; the first refraction layer is arranged on the substrate; the transparent electrode layer is arranged on the first refraction layer; a light emitting layer disposed on the transparent electrode layer; a reflective electrode layer disposed on the light-emitting layer; the second refraction layer is arranged on the other side of the substrate, which is far away from the first refraction layer; wherein, the refractive index on second refraction layer is greater than the refractive index of base plate, the refractive index of base plate is greater than the refractive index on first refraction layer, the refractive index on first refraction layer is greater than the refractive index of transparent electrode layer, the refractive index of transparent electrode layer is greater than the refractive index of luminescent layer realizes that the emergent light can penetrate display panel perpendicularly, reduces display device's visual angle, increases the privacy in the use. A display device including the display panel is also provided.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a display panel and a display device capable of switching a narrow viewing angle.
Background
The OLED display technology has been applied in the fields of smart phones, tablet computers, and the like. Currently, the wide viewing angle display technology belongs to the mainstream development direction of the existing display panel (for example, OLED display panel). For example, wide-viewing-angle display technologies are used in portable electronic devices with wide viewing angles, such as notebook computers, tablet computers, and mobile phones, so that people can view complete and undistorted images when watching a display panel in a wide-viewing-angle mode from different directions. However, when personal privacy and important information are involved, for example, in public places, many people do not want their own mobile phones or computers to be seen by others, and want to protect their privacy, and a display panel in the wide viewing angle mode would make people feel that privacy is not protected. In this case, the display panel in the wide viewing angle mode needs to be switched to the narrow viewing angle mode for use.
At present, a common implementation manner for switching between the wide viewing angle mode and the narrow viewing angle mode of the display panel is to use a louver technology, but this manner needs to additionally prepare a louver shielding film, and needs to be carried about by a user, which causes great inconvenience to the user, and this manner also causes a serious loss of brightness of the display panel, and has a drawback of high manufacturing cost.
Therefore, there is a need to provide an improved technical solution to overcome the above technical problems in the prior art.
Disclosure of Invention
In view of the above, the present disclosure provides a display panel and a display device capable of switching viewing angles, so as to solve the problems of inconvenience and poor effect of switching the viewing angles of the display panel in the prior art.
The present disclosure provides a display panel including: a substrate; the first refraction layer is arranged on the substrate; the transparent electrode layer is arranged on the first refraction layer; a light emitting layer disposed on the transparent electrode layer; a reflective electrode layer disposed on the light-emitting layer; the second refraction layer is arranged on the other side of the substrate, which is far away from the first refraction layer; wherein, a refractive index of the second refraction layer is greater than a refractive index of the substrate, a refractive index of the substrate is greater than a refractive index of the first refraction layer, and a refractive index of the first refraction layer is greater than a refractive index of the transparent electrode layer.
According to an embodiment of the present disclosure, the first refraction layer includes a first upper refraction layer and a first lower refraction layer, the first upper refraction layer is connected to the transparent electrode layer, the first lower refraction layer is connected to the substrate, and a refractive index of the first upper refraction layer is greater than a refractive index of the first lower refraction layer.
According to an embodiment of the present disclosure, a boundary between the first upper refractive layer and the first lower refractive layer is wavy.
According to an embodiment of the present disclosure, the second refraction layer includes a second upper refraction layer and a second lower refraction layer, the second upper refraction layer is connected to the substrate, the substrate is far away from the other side of the first refraction layer, the second lower refraction layer is connected to the second upper refraction layer, and a refractive index of the second upper refraction layer is greater than a refractive index of the second lower refraction layer.
According to an embodiment of the present disclosure, a boundary surface between the second upper refractive layer and the second lower refractive layer is wavy.
According to an embodiment of the disclosure, an electro-optical crystal layer is disposed on a side of the second refraction layer away from the substrate, two ends of the electro-optical crystal layer are respectively disposed with an additional electrode, and an electric field is formed between the two additional electrodes, so as to control a deflection angle of an emergent light.
According to an embodiment of the present disclosure, the refractive index of the light emitting layer is in a range from 1.70 to 1.80, the refractive index of the transparent electrode layer is in a range from 1.81 to 1.90, the refractive index of the first refractive layer is in a range from 1.91 to 2.00, the refractive index of the substrate is in a range from 2.01 to 2.10, and the refractive index of the second refractive layer is in a range from 2.30 to 2.50.
According to an embodiment of the present disclosure, the first refractive layer is made of a zinc oxide material.
According to an embodiment of the present disclosure, the second refraction layer is made of a zinc sulfide material.
The present disclosure further provides a display device including the display panel as described above.
The beneficial effects of the present disclosure are as follows. The present disclosure provides a display panel and a display device capable of realizing viewing angle switching. The refractive index between each layer is adjusted by utilizing the first refraction layer and the second refraction layer, so that emergent light emitted by the light emitting layer can be vertically emitted. Thus, emergent light can deflect towards the direction vertical to the display panel, and the purpose of realizing a narrow visual angle mode is achieved. This means that the displayed content can only be viewed by a user in front of the display panel, the displayed content is difficult to be viewed by people on both sides of the display panel or around the display panel, privacy of the user can be protected, and further, by providing the electro-optical crystal layer, the direction and angle of the emergent light can be controlled by the user, i.e., the user can switch the wide viewing angle mode or the narrow viewing angle mode of the display device as required, thereby realizing arbitrary switching between the wide viewing angle and the narrow viewing angle.
Drawings
Fig. 1 is a schematic view of a display panel according to a first embodiment of the disclosure.
Fig. 2 is a schematic view of a display panel according to a second embodiment of the disclosure.
FIG. 3 is a schematic view of a display panel according to a third embodiment of the present disclosure.
FIG. 4 is a schematic view of a display panel according to a fourth embodiment of the present disclosure.
FIG. 5 is a schematic view showing a part of an electro-optic crystal layer in a fourth embodiment of a display panel according to the present disclosure.
Detailed Description
The following description of the various embodiments refers to the accompanying drawings, which illustrate specific embodiments in which the disclosure may be practiced. In the drawings, elements having similar structures are denoted by the same reference numerals.
Referring to fig. 1, fig. 1 is a schematic view of a display panel according to a first embodiment of the disclosure. The present disclosure provides a display panel 1 including: a substrate 10; a first refractive layer 20 disposed on the substrate 10; a transparent electrode 30 disposed on the first refractive layer 20; a light emitting layer 40 disposed on the transparent electrode layer 30; a reflective electrode 50 disposed on the light-emitting layer 40; a second refraction layer 60 disposed on the other side of the substrate 10 away from the first refraction layer 20; wherein, the refractive index of the second refraction layer 60 is greater than the refractive index of the substrate 10, the refractive index of the substrate 10 is greater than the refractive index of the first refraction layer 20, the refractive index of the first refraction layer 20 is greater than the refractive index of the transparent electrode layer 30, so that the emergent light can deflect towards the normal (perpendicular to an axis of a long axis of the substrate 10). The substrate 10 is disposed between the first refraction layer 20 and the second refraction layer 60, and the emergent light is refracted by the two refraction layers to ensure that the emergent light is deflected toward the normal direction.
In the present embodiment, the display panel 1 is an OLED display panel, but not limited thereto. The refractive index of the light-emitting layer 40 is n1The refractive index of the transparent electrode layer 30 is n2The refractive index of the first refractive layer 20 is n3The refractive index of the substrate 10 is n4The refractive index of the second refractive layer 60 is n5Wherein n is1<n2<n3<n4<n5. Furthermore, the refractive index of the light emitting layer 40 is between 1.70 and 1.80Within a range of (a), for example, preferably 1.76; the refractive index of the transparent electrode layer 30 is in a range of 1.81 to 1.90, for example, 1.85 is preferable; the refractive index of the first refractive layer 20 is in a range of 1.91 to 2.00, for example, 1.95 is preferable; the refractive index of the substrate 10 is in a range of 2.01 to 2.10, for example, preferably 2.05; the refractive index of the second refractive layer 60 is in a range of 2.30 to 2.50, for example, preferably 2.4; . The setting of the refractive index of each layer can ensure that emergent light can vertically emit out of the display panel, and the brightness of the two sides of the display panel or the light emitting side around the display panel is reduced.
More specifically, after the outgoing light is emitted from the light-emitting layer 40, the outgoing light passes through the transparent electrode layer 30, and since the refractive index of the transparent electrode layer 30 is greater than that of the light-emitting layer 40, the outgoing light is deflected in the normal direction (i.e., an axis a1 perpendicular to a long axis of the transparent electrode layer). The emergent light enters the first refraction layer 20 through the transparent electrode layer 30 after being refracted, and the emergent light can be deflected towards a normal line (i.e. an axis a2 perpendicular to a long axis of the first refraction layer 20) because the refractive index of the first refraction layer 20 is larger than that of the transparent electrode layer 30. The emergent light is refracted and then enters the substrate 10 through the first refraction layer 20, and because the refractive index of the substrate 10 is greater than that of the first refraction layer 20, the emergent light is deflected towards the normal direction (i.e. an axis a3 perpendicular to a long axis of the substrate 10). Finally, the emergent light enters the second refraction layer 60 through the substrate 10 after being refracted, and since the refraction index of the second refraction layer 60 is greater than that of the substrate 10, the emergent light is deflected toward the normal (i.e. an axis a4 perpendicular to a long axis of the second refraction layer 60), so that the emergent light emitted from the second refraction layer 60 is emitted in a plane substantially perpendicular to the plane where the display panel 1 is located and is received by a user directly in front of or directly above the display panel 1. However, other people on both sides or around the display panel cannot receive the emitted light that is emitted substantially perpendicular to the plane on which the display panel is located, and thus the content displayed on the display panel is difficult to see. For example, when viewed from one side of the display panel (e.g., the left side of the display panel), the brightness of the display panel decreases and is more blurred when viewed at an oblique angle relative to the display panel. The emergent light can be vertically emitted out of the display panel, the brightness of the two sides of the display panel or the light emitting sides around the display panel is reduced in a narrow viewing angle mode, and the use privacy of a user is improved.
Referring to fig. 2, fig. 2 is a schematic view of a display panel according to a second embodiment of the disclosure. The present embodiment differs from the first embodiment in that: in this embodiment, the first refraction layer 20 includes a first upper refraction layer 21 and a first lower refraction layer 22, the first upper refraction layer 21 is connected to the transparent electrode layer 30, the first lower refraction layer 22 is connected to the substrate 10, and a refractive index of the first upper refraction layer 21 is greater than a refractive index of the first lower refraction layer 22. And, an interface 23 between the first upper refractive layer 21 and the first lower refractive layer 22 is waved. As shown in the figure, the first refraction layer 20 is divided into an upper layer and a lower layer, and the upper layer 21 and the lower layer 22 are respectively a first upper refraction layer and a first lower refraction layer according to the order of passing the emergent light. When the emergent light enters the first refraction layer 20, when the incident light at the first upper refraction layer 21 passes through the interface 23 between the first upper refraction layer 21 and the first lower refraction layer 22, the emergent light is refracted because the refractive index of the first upper refraction layer 21 is greater than that of the first lower refraction layer 22, the refracted emergent light is deflected away from the normal direction (i.e. the direction perpendicular to a long axis of the substrate 10), the total reflection effect when the emergent light exits from the first refraction layer 20 is reduced, and the light output amount of the emergent light which vertically exits the display panel is increased.
Referring to fig. 3, fig. 3 is a schematic view of a display panel according to a third embodiment of the present disclosure. The present embodiment differs from the second embodiment in that: in this embodiment, the second refraction layer 60 includes a second upper refraction layer 61 and a second lower refraction layer 62, the second upper refraction layer 61 is connected to the other side of the substrate 10 far away from the first refraction layer 20, the second lower refraction layer 62 is connected to the second upper refraction layer 61, and a refractive index of the second upper refraction layer 61 is greater than a refractive index of the second lower refraction layer 62. And, an interface 63 between the second upper refractive layer 61 and the second lower refractive layer 62 is wavy. As shown in the figure, the second refraction layer 60 is divided into upper and lower layers, which are a second upper refraction layer 61 and a second lower refraction layer 62, respectively, according to the order of passing of the outgoing light. When the emergent light enters the second refraction layer 60, when the incident light at the second upper refraction layer 61 passes through the interface 63 between the second upper refraction layer 61 and the second lower refraction layer 62, the emergent light is refracted because the refractive index of the second upper refraction layer 61 is greater than the refractive index of the second lower refraction layer 62, the refracted emergent light is deflected in the direction away from the normal (i.e. in the direction perpendicular to the long axis of the substrate 10), the total reflection effect when the emergent light exits from the second refraction layer is reduced, and the light output amount of the emergent light which vertically exits the display panel is increased.
Referring to fig. 4, fig. 4 is a schematic view of a display panel according to a fourth embodiment of the present disclosure. The difference between this embodiment and the previous embodiment is: in this embodiment, an electro-optic crystal layer 70 is disposed on a side of the second refraction layer 60 away from the substrate 10, two ends of the electro-optic crystal layer 70 are respectively disposed with an additional electrode 71, and an electric field is formed between the two additional electrodes 71, so as to control a deflection angle of the emergent light. The two additional electrodes 71 are respectively disposed at two ends of the electro-optic crystal layer 70 and adjacent to the second refractive layer 60, so that light emitted from the second refractive layer 60 can directly enter the electro-optic crystal layer 70 and be subjected to an electric field.
As shown in the figure, the electro-optical crystal layer 70 controls the emission direction of the emergent light passing through the electro-optical crystal layer under the action of the electric field. Referring to fig. 5, fig. 5 is a schematic view illustrating a partial function of an electro-optic crystal layer in a fourth embodiment of the display panel of the present disclosure. The principle of action of the electro-optic crystal layer is shown in figure 5. The electro-optic crystal layer has a refractive index gradient perpendicular to the incident direction of the light exiting from the second refractive layer 60. When the emergent light emitted from the second refraction layer 60 enters the electro-optical crystal layer, the emergent light can be refracted in different degrees at the electro-optical crystal layer 70 due to the refractive index gradient, the deflection angle theta can be formed after the emergent light exits the electro-optical crystal layer, theta is in direct proportion to the refractive index gradient of the electro-optical crystal layer 70, and the refractive index gradient of the electro-optical crystal layer 70 is in direct proportion to the electric field E due to the regulation and control of the electric field generated by the two additional electrodes 71. Further, the deflection angle θ may be specifically represented by the following formula:
Wherein L is the length of the electro-optical crystal layer, n is the optical refractive index of the electro-optical crystal layer, r33The photoelectric coefficient, E the electric field strength, and X the axially distributed electric field.
Therefore, the purpose of controlling the deflection angle θ of the emitted light can be achieved by controlling the electric field intensity generated by the two external electrodes 71, and the switching between the wide viewing angle mode and the narrow viewing angle mode can be achieved by whether the electric field is formed between the two external electrodes 71, and further the deflection of the emitted light to a specific angle can be controlled by the formed electric field intensity.
In summary, the first refractive layer and the second refractive layer function to enable outgoing light emitted from the light emitting layer to be emitted perpendicularly to the display panel; and the electro-optical crystal has the function of enabling emergent light emitted perpendicular to the display panel to be controlled to deflect at a specific deflection angle. The present disclosure further provides a display device including the display panel as described above. Compared with the existing display equipment, the display equipment adopting the display panel has the advantages that the privacy of a user in use is better improved, and the switching between the wide viewing angle mode and the narrow viewing angle mode is facilitated.
The beneficial effects of the present disclosure are as follows. The present disclosure provides a display panel and a display device capable of realizing viewing angle switching. The refractive index between each layer is adjusted by utilizing the first refraction layer and the second refraction layer, so that emergent light emitted by the light emitting layer can be vertically emitted. Thus, emergent light can deflect towards the direction vertical to the display panel, and the purpose of realizing a narrow visual angle mode is achieved. This means that the displayed content can only be viewed by a user in front of the display panel, the displayed content is difficult to be viewed by people on both sides of the display panel or around the display panel, privacy of the user can be protected, and further, by providing the electro-optical crystal layer, the direction and angle of the emergent light can be controlled by the user, i.e., the user can switch the wide viewing angle mode or the narrow viewing angle mode of the display device as required, thereby realizing arbitrary switching between the wide viewing angle and the narrow viewing angle.
While the foregoing is directed to the preferred embodiment of the present disclosure, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the principles of the disclosure, and it is intended that such changes and modifications be covered by the appended claims.
Claims (9)
1. A display panel, comprising:
a substrate;
the first refraction layer is arranged on the substrate;
the transparent electrode layer is arranged on the first refraction layer;
a light emitting layer disposed on the transparent electrode layer;
a reflective electrode layer disposed on the light-emitting layer;
the second refraction layer is arranged on the other side of the substrate, which is far away from the first refraction layer;
the refractive index of the second refraction layer is greater than that of the substrate, the refractive index of the substrate is greater than that of the first refraction layer, the refractive index of the first refraction layer is greater than that of the transparent electrode layer, and the refractive index of the transparent electrode layer is greater than that of the light-emitting layer;
and an electro-optic crystal layer is arranged on one side of the second refraction layer, which is far away from the substrate, two ends of the electro-optic crystal layer are respectively provided with an additional electrode, the two additional electrodes are respectively arranged on the two ends of the electro-optic crystal layer and are adjacent to the second refraction layer, and an electric field is formed between the two additional electrodes so as to control a deflection angle of emergent light.
2. The display panel of claim 1, wherein the first refractive layer comprises a first upper refractive layer and a first lower refractive layer, the first upper refractive layer is connected to the transparent electrode layer, the first lower refractive layer is connected to the substrate, and a refractive index of the first upper refractive layer is greater than a refractive index of the first lower refractive layer.
3. The display panel of claim 2, wherein an interface between the first upper refractive layer and the first lower refractive layer is wavy.
4. The display panel of claim 1, wherein the second refractive layer comprises a second upper refractive layer and a second lower refractive layer, the second upper refractive layer is connected to the other side of the substrate away from the first refractive layer, the second lower refractive layer is connected to the second upper refractive layer, and a refractive index of the second upper refractive layer is greater than a refractive index of the second lower refractive layer.
5. The display panel of claim 4, wherein a boundary between the second upper refractive layer and the second lower refractive layer has a wavy shape.
6. The display panel of claim 1, wherein the refractive index of the light emitting layer is in a range of 1.70 to 1.80, the refractive index of the transparent electrode layer is in a range of 1.81 to 1.90, the refractive index of the first refractive layer is in a range of 1.91 to 2.00, the refractive index of the substrate is in a range of 2.01 to 2.10, and the refractive index of the second refractive layer is in a range of 2.30 to 2.50.
7. The display panel of claim 1 wherein the first refractive layer is of a zinc oxide material.
8. The display panel of claim 1 wherein the second refractive layer is comprised of a zinc sulfide material.
9. A display device characterized by comprising the display panel as claimed in claim 1.
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| CN103454808A (en) * | 2013-09-06 | 2013-12-18 | 京东方科技集团股份有限公司 | Array substrate, color film substrate and display device |
| CN108878674A (en) * | 2017-05-11 | 2018-11-23 | 京东方科技集团股份有限公司 | Display base plate and preparation method thereof, display device |
| CN210296416U (en) * | 2019-10-16 | 2020-04-10 | 广东聚华印刷显示技术有限公司 | Display device and display apparatus |
| CN111261694A (en) * | 2020-03-25 | 2020-06-09 | 京东方科技集团股份有限公司 | Display panel and display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103454808A (en) * | 2013-09-06 | 2013-12-18 | 京东方科技集团股份有限公司 | Array substrate, color film substrate and display device |
| CN108878674A (en) * | 2017-05-11 | 2018-11-23 | 京东方科技集团股份有限公司 | Display base plate and preparation method thereof, display device |
| CN210296416U (en) * | 2019-10-16 | 2020-04-10 | 广东聚华印刷显示技术有限公司 | Display device and display apparatus |
| CN111261694A (en) * | 2020-03-25 | 2020-06-09 | 京东方科技集团股份有限公司 | Display panel and display device |
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