WO2022033237A1

WO2022033237A1 - Display panel and display device

Info

Publication number: WO2022033237A1
Application number: PCT/CN2021/104615
Authority: WO
Inventors: 石广东; 马士庆; 春晓改; 贺双江; 贾一凡; 刘韬; 李晓光; 徐诗雨; 晏斌; 张珊; 韩子平
Original assignee: 京东方科技集团股份有限公司; 北京京东方显示技术有限公司
Priority date: 2020-08-10
Filing date: 2021-07-06
Publication date: 2022-02-17
Also published as: CN213069412U

Abstract

Embodiments of the present disclosure provide a display panel and a display device. The display panel comprises: a display substrate that generates first linearly polarized light for display; and a depolarization layer located on a display side of the display substrate. According to the embodiments of the present disclosure, the polarization of the first linearly polarized light can be reduced, the absorption of a Haidinger's brush for blue light is increased, and thus asthenopia of a user watching the display panel is relieved, thereby achieving an eye protection function.

Description

Display panel and display device

This application claims the priority of Chinese Patent Application No. 202021650302.0 filed on August 10, 2020, and the content disclosed in the above Chinese patent application is hereby cited in its entirety as a part of this application.

technical field

The present disclosure relates to the field of display technology, and in particular, to a display panel and a display device.

Background technique

With the development of display technology, the performance and indicators of display products can meet or even exceed the needs of users. In addition, the eye protection function of display products has also attracted the attention of users.

SUMMARY OF THE INVENTION

Embodiments of the present disclosure provide a display panel and a display device.

According to a first aspect of the present disclosure, a display panel is provided. The display panel includes: a display substrate generating first linearly polarized light for display; and a depolarizing layer on a display side of the display substrate.

In an embodiment of the present disclosure, the material of the depolarizing layer includes polyethylene terephthalate.

In an embodiment of the present disclosure, the thickness of the depolarizing layer is in the range of 20 micrometers to 200 micrometers.

In an embodiment of the present disclosure, the thickness of the depolarizing layer is 80 microns.

In an embodiment of the present disclosure, the depolarizing layer converts the first linearly polarized light into at least one of linearly polarized light having different polarization directions from each other and nonlinearly polarized light.

In an embodiment of the present disclosure, the display substrate includes an LCD display substrate or an OLED display substrate.

In an embodiment of the present disclosure, the LCD display substrate includes a first polarizer, a color filter substrate, an array substrate and a second polarizer that are sequentially arranged along a direction perpendicular to the depolarizing layer, the first polarizer for generating the first linearly polarized light.

In an embodiment of the present disclosure, the OLED display panel includes a third polarizer, a quarter-wave plate, an anode layer and a cathode layer arranged in sequence along a direction perpendicular to the depolarization layer, the third polarizer A sheet is used to generate the first linearly polarized light.

According to a second aspect of the present disclosure, there is provided a display device. The display device includes any one of the display panels described in the first aspect of the present disclosure.

According to the embodiments of the present disclosure, the polarization of the first linearly polarized light can be reduced, the absorption of blue light by the Haidinger brush can be increased, the eyestrain of the user viewing the display panel can be relieved, and the eye protection function can be realized.

Further aspects and scope of adaptability will become apparent from the description provided herein. It should be understood that various aspects of the present application may be implemented alone or in combination with one or more other aspects. It should also be understood that the description and specific examples herein are intended for purposes of illustration and are not intended to limit the scope of the application.

Description of drawings

The drawings described herein are for illustrative purposes only of selected embodiments, and not all possible implementations, and are not intended to limit the scope of the application, wherein:

Figure 1 shows the effect of Haidinger brushes on polarized light with different polarizations;

Figure 2 shows a schematic diagram of the distribution of the Haidinger brush of the human eye;

FIG. 3 shows a schematic diagram of the structure of a display panel according to an embodiment of the present disclosure;

4 shows a scanning electron microscope image of a depolarizing layer according to an embodiment of the present disclosure;

5 illustrates the effect of a depolarizing layer on first linearly polarized light according to an embodiment of the present disclosure;

6A-6B illustrate schematic diagrams of the structure of a display panel according to an embodiment of the present disclosure; and

FIG. 7 is a schematic diagram illustrating a structure of a display device according to an embodiment of the present disclosure.

detailed description

In the description of the present disclosure, it is to be understood that the terms "longitudinal", "radial", "upper", "lower", "front", "rear", "left", "right", "vertical" , "horizontal", "top", "bottom", "inside", "outside", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of describing the present disclosure and simplifying the description, It is not intended to indicate or imply that the referred device or element must have a particular orientation, be constructed and operate in a particular orientation and therefore should not be construed as a limitation of the present disclosure.

Hereinafter, the present disclosure will be described in detail in conjunction with the embodiments with reference to the accompanying drawings. It should be noted that the features in the embodiments of the present disclosure may be combined with each other without conflict.

Studies have shown that blue light in natural light (usually in the range of 415nm to 450nm) irradiates the human eye for a long time, which can cause damage to the rod cells of the human eye. Before the blue light reaches the rod cells, however, it is absorbed by the lutein cells, a structure called a Haidinger brush. Figure 1 shows the effect of a Haidinger brush on polarized light with different polarities. As shown in Figure 1, when the long axis of the Haidinger brush is parallel to the polarization direction of the linearly polarized light, the linearly polarized light is absorbed, and when its long axis is perpendicular to the polarization direction of the linearly polarized light, the linearly polarized light is absorbed. not absorbed. Continuing to refer to FIG. 1 , since circularly polarized light has various polarization directions, circularly polarized light can be absorbed in various directions.

Figure 2 shows a schematic diagram of the distribution of the Haidinger brushes of the human eye. As shown in Figure 2, the distribution of the Haidinger brushes is radial. Since natural light includes all possible polarization directions perpendicular to the direction of light wave propagation, Therefore, the Haidinger brush can absorb blue light with various polarization directions. It can be seen that this physiological structure of the human eye can be fully utilized to protect the human eye.

With the development of display products (eg, Liquid Crystal Displays (LCD), Organic Light Emitting Diodes (OLED)), display products have been used by humans for a long time. However, light emerging from a display product is typically linearly polarized light having only a single polarization direction. Long-term use of such display products will make the Haidinger brush in one direction in the human eye overuse and lose its function, while the Haidinger brush in other directions can't really work, which leads to myopia, visual fatigue, human macular degeneration, etc.

FIG. 3 is a schematic diagram showing the structure of the display panel 30 according to an embodiment of the present disclosure. As shown in FIG. 3 , the display panel 30 may include a display substrate 32 , and a depolarizing layer 34 on the display side 302 a of the display substrate 32 . The display substrate 32 may generate the first linearly polarized light for display.

In an embodiment of the present disclosure, the depolarization layer 34 may reduce the polarization of the first linearly polarized light. It should be understood that, in the context of embodiments of the present disclosure, the term "depolarization" refers to converting linearly polarized light having a specific polarization direction into at least one of the following: linearly polarized light having mutually different polarization directions and nonlinear polarized light.

With the display panel according to the embodiment of the present disclosure, by additionally introducing a depolarizing layer to reduce the polarization of the first linearly polarized light, it is possible to effectively prevent only part of the Haidinger brush from participating in the absorption of blue light, thereby relieving the user from Eye fatigue when watching the display panel, realize the function of eye protection.

In the embodiment of the present disclosure, the material of the depolarization layer may include polyethylene terephthalate (Polyethylene terephthalate, PET for short). Figure 4 shows a scanning electron microscope image of a depolarizing layer made of PET. As shown in Figure 4, various microstructures (eg, microparticles) are present in the depolarizing layer, which are optically isotropic heterosexual.

5 illustrates the effect of a depolarizing layer on first linearly polarized light according to an embodiment of the present disclosure. As shown in FIG. 5, when the first linearly polarized light propagates through the depolarizing layer 34, due to the anisotropy of the microstructure in the depolarizing layer 34, the depolarizing layer 34 converts the first linearly polarized light to have different from each other At least one of linearly polarized light (as shown by the dotted line box A in FIG. 5 ) and non-linear polarized light (as shown by the dotted line boxes B and C in FIG. 5 ) in the polarization direction of .

In an embodiment of the present disclosure, the nonlinearly polarized light may include at least one of circularly polarized light (as shown by the dotted box B in FIG. 5 ) and elliptically polarized light (as shown by the dotted box C in FIG. 5 ).

In embodiments of the present disclosure, the thickness of the depolarizing layer may range from about 20 microns to about 200 microns. The greater the thickness of the depolarizing layer, the more the polarizability of the first linearly polarized light is reduced. However, increasing the thickness of the depolarizing layer reduces its light transmittance. Typically, for a depolarizing layer of PET material, the transmittance is about 94% when the thickness of the depolarizing layer is about 20 microns, and the transmittance is about 92 when the thickness of the depolarizing layer is about 80 microns. %.

In one example, the thickness of the depolarizing layer can be adjusted so that the depolarizing layer converts the first linearly polarized light into elliptically polarized light. In another example, the thickness of the depolarizing layer can be adjusted so that the depolarizing layer converts the first linearly polarized light to circularly polarized light. In yet another example, the thickness of the depolarizing layer may be about 80 microns, such that the depolarizing layer converts the first linearly polarized light into linearly polarized light, elliptically polarized light, and circularly polarized light having different polarization directions from each other. As a result, not only can the Haidinger brushes in each polarization direction be fully utilized to increase the blue light absorption rate when absorbing blue light, but also the excessive use of the Haidinger brushes in a single polarization direction can be prevented, thereby reducing the problem of viewing the display panel. User's eye fatigue, realize the function of eye protection.

In an embodiment of the present disclosure, the display substrate of the display panel may include an LCD display substrate or an OLED display substrate. 6A shows a schematic diagram of the structure of the display panel 30 according to an embodiment of the present disclosure, wherein the display substrate of the display panel 30 is an LCD display substrate 32a. As shown in FIG. 6A , the LCD display substrate 32 a may include a first polarizer 321 , a color filter substrate 322 , an array substrate 323 and a second polarizer 324 arranged in sequence along a direction perpendicular to the depolarizing layer 34 . The first polarizer 321 may be used to generate the first linearly polarized light. As described above, the depolarizing layer 34 may convert the first linearly polarized light generated by the first polarizer 321 into linearly polarized light, elliptically polarized light, and circularly polarized light having different polarization directions from each other.

6B shows a schematic diagram of the structure of the display panel 30 according to an embodiment of the present disclosure, wherein the display substrate of the display panel 30 is an OLED display substrate 32b. As shown in FIG. 6B , the OLED display substrate 32 b includes a third polarizer 325 , a quarter-wave plate 326 , an anode layer 327 and a cathode layer 328 arranged in sequence along a direction perpendicular to the depolarizing layer 34 . The third polarizer 325 may be used to generate the first linearly polarized light. As described above, the depolarizing layer 34 may convert the first linearly polarized light generated by the third polarizer 325 into linearly polarized light, elliptically polarized light, and circularly polarized light having different polarization directions from each other.

FIG. 7 is a schematic diagram showing the structure of a display device 40 according to an embodiment of the present disclosure. As shown in FIG. 7 , the display device 40 includes the display panel 30 as described above. Since the display device 40 reduces the polarization of the linearly polarized light used for display, the eye fatigue of the user viewing the display device can be relieved, and the absorption of blue light by the human eye can be increased, thereby realizing the eye protection function.

The foregoing description of the embodiments has been provided for the purposes of illustration and description. It is not intended to be exhaustive or to limit this application. Individual elements or features of a particular embodiment are generally not limited to the particular embodiment, but, where appropriate, are interchangeable and can be used in a selected embodiment, even if not specifically shown or described . The same can also be changed in many ways. Such changes are not to be considered a departure from this application, and all such modifications are included within the scope of this application.

Claims

A display panel, comprising:

a display substrate that generates first linearly polarized light for display; and

a depolarizing layer on the display side of the display substrate.
The display panel according to claim 1, wherein the material of the depolarizing layer comprises polyethylene terephthalate.
The display panel according to claim 2, wherein the thickness of the depolarizing layer is in the range of 20 micrometers to 200 micrometers.
The display panel according to claim 3, wherein the thickness of the depolarizing layer is 80 microns.
The display panel of claim 1, wherein the depolarizing layer converts the first linearly polarized light into at least one of linearly polarized light having mutually different polarization directions and nonlinear polarization Light.
The display panel according to claim 1, wherein the display substrate comprises an LCD display substrate or an OLED display substrate.
The display panel according to claim 6, wherein the LCD display substrate comprises a first polarizer, a color filter substrate, an array substrate and a second polarizer arranged in sequence along a direction perpendicular to the depolarizing layer, The first polarizer is used to generate the first linearly polarized light.
The display panel according to claim 6, wherein the OLED display panel comprises a third polarizer, a quarter-wave plate, an anode layer and a cathode layer sequentially arranged along a direction perpendicular to the depolarization layer , the third polarizer is used to generate the first linearly polarized light.
A display device comprising the display panel according to any one of claims 1-8.