CN116243511A

CN116243511A - Waveguide cover plate and display device

Info

Publication number: CN116243511A
Application number: CN202111493887.9A
Authority: CN
Inventors: 苏骏峰; 王光明; 邓泽方; 徐向阳
Original assignee: Guangdong Genius Technology Co Ltd
Current assignee: Guangdong Genius Technology Co Ltd
Priority date: 2021-12-08
Filing date: 2021-12-08
Publication date: 2023-06-09

Abstract

The application provides a waveguide cover plate and a display device, wherein the waveguide cover plate comprises a substrate, a plurality of through holes which are arranged in an array are formed in the substrate, the through holes can be in one-to-one correspondence with sub-pixels of a display panel, a reflecting layer is arranged on the hole wall of each through hole, the cross section area of each through hole gradually decreases from the light incident side of the substrate to the light emergent side of the substrate, the hole wall of each through hole is a part of an elliptic surface, and the cross section of each through hole, which is close to the light emergent side of the substrate, is positioned on a first focal plane of the elliptic surface; the display device comprises a display panel and a waveguide cover plate, wherein the waveguide cover plate is positioned on the light emitting side of the display panel, and the light emitting surface of the sub-pixel of the display panel is positioned on the second focal plane of the elliptic curved surface. The waveguide cover plate provided by the application is used for processing the hole wall of the through hole into a part of an elliptic curved surface, so that the hole wall covered with the reflecting layer has the optical property of an elliptic mirror surface, and the technical problems that the definition of a picture displayed by a display device is reduced and the visual angle of the display device is limited due to the cylindrical hole on the cover plate are solved.

Description

Waveguide cover plate and display device

Technical Field

The application belongs to the technical field of display, and particularly relates to a waveguide cover plate and a display device.

Background

A liquid crystal display device and an OLED (Organic Light-Emitting Diode) display device are two important display tools, wherein the liquid crystal display device generally comprises a backlight module, a display panel and a cover plate, and the OLED display device comprises a self-luminous display panel and a cover plate. Currently, the human eye sees the picture from the liquid crystal display device or the OLED display device on the surface of the display panel with a cover plate (glass) therebetween, so that the user obviously perceives that the picture is inside the liquid crystal display device or the OLED display device; whereas in conventional paper-based printed products, the picture is the uppermost layer of the product, and the feeling when viewed by the human eye is more comfortable.

In order to solve the above problems, in the prior art, a cylindrical hole is formed in a cover plate, so that a sub-pixel of a display panel can be directly displayed on the surface of the cover plate through the cylindrical hole, and the effect of simulating the display of a picture of a paper printed product on the uppermost layer is achieved. However, the design of the cylindrical hole has the following problems:

1. after light entering the cylindrical hole from different angles is reflected by the hole wall, the light can be imaged at different positions on one side far away from the display panel, so that aberration is caused, and the definition of a picture displayed by the display device is affected;

2. the cylindrical hole can limit the visual angle of the display device, so that the visual angle of the display device is reduced;

3. because the cover plate is adhered to the surface of the display panel through the optical cement, a certain distance exists between the cover plate and the display panel, so that light rays with larger angles can enter the adjacent cylindrical holes, crosstalk can be generated on the light rays transmitted in the adjacent cylindrical holes, and the definition of a picture displayed by the display device is reduced.

Disclosure of Invention

The embodiment of the application provides a waveguide cover plate and a display device for solve the technical problems that a cylindrical hole on the cover plate can reduce the definition of a picture displayed by the display device and limit the visual angle of the display device.

The basic idea proposed by the inventors of the present application is: the hole wall of the through hole on the cover plate is changed from a cylindrical curved surface to an elliptical curved surface, and the light of the sub-pixel is focused on the surface of the cover plate by utilizing the optical characteristics of the elliptical curved surface, so that the aberration is reduced, and the limitation on the visual angle is reduced.

Based on the basic conception, the embodiment of the application provides a waveguide cover plate, which comprises a substrate, a plurality of through holes which are arrayed are formed in the substrate, the through holes can be in one-to-one correspondence with sub-pixels of a display panel, a reflecting layer is arranged on the hole wall of each through hole, the cross section area of each through hole gradually decreases from the light incident side of the substrate to the light emergent side of the substrate, the hole wall of each through hole is a part of an elliptic curved surface, and the cross section of each through hole, which is close to the light emergent side of the substrate, is positioned on a first focal plane of the elliptic curved surface.

In some embodiments, a surface of the substrate facing the light exit side is coplanar with the first focal plane.

In some embodiments, the through holes are filled with a light transmissive material.

In some embodiments, the substrate is a light-transmitting substrate, a light shielding layer is disposed on a surface of the light-transmitting substrate facing the light incident side, the light shielding layer includes a plurality of voids, and positions of the voids correspond to positions of the through holes.

In some embodiments, the light-transmitting substrate is provided with a composite optical film on a surface facing the light-emitting side.

In some embodiments, the composite optical film is subjected to an antiglare treatment.

In some embodiments, the substrate is a light absorbing substrate.

The embodiment of the application also provides a display device, which comprises a display panel and the waveguide cover plate, wherein the waveguide cover plate is positioned on the light emitting side of the display panel, and the light emitting surface of the sub-pixel of the display panel is positioned on the second focal plane of the elliptic curved surface.

In some embodiments, the waveguide cover plate is adhered to a surface of the display panel facing the light emitting side through optical adhesive.

In some embodiments, the display panel is a liquid crystal panel or an organic light emitting diode panel.

The waveguide cover plate and the display device provided by the embodiment of the application are characterized in that the hole wall of the through hole on the waveguide cover plate is processed into a part of an elliptic curved surface, so that the hole wall covered with the reflecting layer has the optical property of an elliptic mirror surface, and the following beneficial effects are realized:

1. the aberration is reduced, the formation of diffuse spots is prevented, and the display effect of the display device is ensured;

2. the emergence angle of the light rays entering the through hole when the light rays are emitted from the opening of the through hole on the light-emitting side of the substrate can be increased, so that the display visual angle of the display device is increased;

3. even if the light rays with larger emergence angles enter the adjacent through holes, crosstalk can not be generated on the light rays transmitted in the adjacent through holes, and the definition of the display image can be improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic cross-sectional view of a waveguide cover plate in the related art;

FIG. 2 is a schematic cross-sectional view of a display panel according to some embodiments of the present disclosure;

FIG. 3 is an enlarged schematic view of portion A of FIG. 2;

FIG. 4 is a schematic cross-sectional view of a waveguide cover plate according to further embodiments of the present disclosure;

FIG. 5 is a schematic cross-sectional view of a waveguide cover plate provided in accordance with further embodiments of the present application;

fig. 6 is a schematic cross-sectional view of a display device according to some embodiments of the present application.

Wherein, each reference sign in the figure:

10' -waveguide cover plate, 11' -substrate, 110' -via, P1-light emitting point, P2-first imaging point, P3-second imaging point;

1-a display device;

10-waveguide cover plate, 11-substrate, 12-reflecting layer, 13-light transmission material, 14-shading layer, 15-composite optical film, 100-elliptic curved surface, 101-first focus, 102-second focus, 110-through hole, 1100-axis of through hole;

20-display panel, 200-emergent face of sub-pixel;

30-optical cement.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without undue burden, are within the scope of the present application.

Reference herein to "an embodiment" or "an implementation" means that a particular feature, structure, or characteristic described in connection with the embodiment or implementation may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those skilled in the art will appreciate, either explicitly or implicitly, that the embodiments described herein may be combined with other embodiments.

The description is as follows: when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element.

The orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. are based on the orientation or positional relationship shown in the drawings, are for convenience of description only, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the patent, and the specific meaning of the terms described above may be understood by those of ordinary skill in the art as appropriate.

The term "plurality" means two or more, unless specifically defined otherwise.

Fig. 2, fig. 3, and fig. 6 are schematic cross-sectional views of a display panel according to some embodiments of the present application, fig. 3 is an enlarged schematic view of a portion a in fig. 2, and fig. 6 is a schematic cross-sectional view of a display device according to some embodiments of the present application. The display device 1 includes a waveguide cover plate 10 and a display panel 20; the display panel 20 is a liquid crystal panel or an Organic Light Emitting Diode (OLED) panel, and is capable of displaying an image, and the image displayed by the display panel 20 is composed of a plurality of pixel units, wherein each pixel unit is composed of at least a sub-pixel emitting red light, a sub-pixel emitting green light and a sub-pixel emitting blue light; the waveguide cover plate 10 is positioned on the light-emitting side of the display panel 20, and can protect the light-emitting surface of the display panel 20; specifically, the waveguide cover plate 10 includes a substrate 11, the substrate 11 is provided with a plurality of through holes 110 arranged in an array, the through holes 110 can be in one-to-one correspondence with sub-pixels of the display panel 20, that is, in the display device 1, the position of each through hole 110 corresponds to the position of one sub-pixel of the display panel 20, and a reflective layer 12 is disposed on the wall of each through hole 110, in this application, the cross-sectional area of the through hole 110 gradually decreases from the light incident side of the substrate 11 to the light emergent side of the substrate 11, the wall of the through hole 110 is a part of an elliptic surface 100, and the cross-section of the through hole 110 near the light emergent side of the substrate 11 is located on a first focal plane of the elliptic surface 100, meanwhile, the light emergent surface 200 of the sub-pixel of the display panel 20 is located on a second focal plane of the elliptic surface 100, that is the elliptic surface 100 includes two focuses, the two focuses are a first focus 101 and a second focus 102, the cross-section of the through hole 110 near the light emergent side of the substrate 11 passes through the first focus 101, and the light emergent surface 200 of the sub-pixel of the display panel 20 passes through the second focus 102; light emitted from the sub-pixels of the display panel 20 enters the corresponding through holes 110, is reflected by the reflective layer 12, and then exits from the opening of the through holes 110 on the light-emitting side of the substrate 11, and is imaged on a first focal plane passing through the first focal point 101.

Preferably, the surface of the substrate 11 facing the light exit side is coplanar with the first focal plane. I.e. the first focal plane of the elliptical curved surface 100, lies on the surface of the substrate 11 facing the light-emitting side thereof. So that an image of the sub-pixels of the display panel 20 can be clearly displayed on the surface of the waveguide cover plate 10 remote from the display panel 20.

In the related art, referring to fig. 1, fig. 1 is a schematic cross-sectional view of a waveguide cover plate in the related art. The substrate 11' of the waveguide cover plate 10' is provided with a cylindrical through hole 110', light emitted by the light emitting point P1 located at the light incident side of the through hole 110' enters the through hole 110', is reflected by the reflecting layer on the wall of the through hole 110', and then is emitted from the opening of the through hole 110' located at the light emergent side of the substrate 11', and is intersected and imaged on a plurality of imaging points such as the first imaging point P2 and the second imaging point P3 … … on the light emergent side of the through hole 110', so as to form diffuse spots, thereby reducing the definition of images displayed by the light emitting point P1.

As can be seen from comparison with the related art, in the display device 1 provided in the present application, since the waveguide cover plate 10 has the through hole 110 with an elliptical curved surface shape, the image of the sub-pixel of the display panel 20 can be imaged on the surface of the waveguide cover plate 10 away from the display panel 20 through the through hole 110, which can not only achieve the effect of simulating the image of the paper printed product to be displayed on the surface, but also prevent the formation of diffuse spots, thereby being beneficial to ensuring the display effect of the display device 1 and improving the definition of the display image.

It can be understood that the liquid crystal panel or the organic light emitting diode panel is a display panel with a structure commonly used in the display field, and the two are different in that the liquid crystal panel needs the backlight module to cooperate to display images, and the organic light emitting diode panel can display images through self-luminescence; the elliptical curved surface 100 is a reference curved surface, and since the hole wall of the through hole 110 is a part of the elliptical curved surface 100, the hole wall of the through hole 110 fully covered by the reflective layer 12 has all optical properties of an elliptical mirror surface; the cross-section of the through-hole 110 refers to a planar area perpendicular to the axis 1100 of the through-hole 110 and surrounded by the wall of the through-hole 110, and the cross-sectional area of the through-hole 110 refers to the area of the planar area.

In the above embodiment, since the hole wall of the through hole 110 is a part of the elliptical curved surface 100, after the light emitted from the second focal point 102 enters the adjacent through hole 110, the light reflected by the hole wall of the through hole 110 is emitted from the opening of the through hole 110 on the light incident side of the substrate 11, but not emitted from the opening of the through hole 110 on the light emergent side of the substrate 11, so that the crosstalk generated to the light propagating in the adjacent through hole 110 after the light with a larger exit angle enters the adjacent through hole 110 is effectively avoided, which is beneficial to ensuring the display effect of the display device 1 and improving the definition of the display image.

In some embodiments, as shown in fig. 6, the waveguide cover plate 10 is adhered to the surface of the display panel 20 facing the light emitting side by an optical adhesive 30. I.e. an optical glue layer is provided between the surface of the display panel 20 facing the light-emitting side thereof and the waveguide cover plate 10. Specifically, the optical adhesive layer has a certain thickness, so that the distance between the light emitting surface of the sub-pixel of the display panel 20 and the substrate 11 is increased, and the light with smaller emitting angle can enter the through hole 110; in the waveguide cover plate 10 'of the related art, since the hole wall of the through hole 110' is a cylindrical surface, after the light emitted from the light emitting point P1 is reflected by the hole wall of the through hole 110', the emission angle at the time of emitting from the opening of the through hole 110' on the light emitting side of the substrate 11 'is consistent with the emission angle at the time of emitting from the light emitting point P1 (as shown in fig. 1), that is, the display viewing angle is reduced due to the waveguide cover plate 10' being added on the display panel; in the waveguide cover plate 10 provided in the present application, since the hole wall of the through hole 110 is a part of the elliptical curved surface 100, after the light emitted from the light emitting surface of the sub-pixel of the display panel 20 is reflected by the hole wall of the through hole 110, the exit angle when the light is emitted from the opening of the through hole 110 located on the light emitting side of the substrate 11 is increased (as shown in fig. 2), so that the display viewing angle of the display device 1 can be increased.

In some embodiments, please refer to fig. 4, fig. 4 is a schematic cross-sectional view of a waveguide cover plate according to other embodiments of the present application. The through-hole 110 is filled with a light-transmitting material 13. Namely, the light-transmitting material 13 is adopted to fully fill the space in the through hole 110, so that the through hole 110 can be prevented from being exposed in the external environment, the through hole 110 is effectively prevented from being blocked by dust, dirt and the like, the display effect is effectively prevented from being influenced, and the capability of the waveguide cover plate 10 for isolating water and oxygen is improved.

Specifically, the light-transmitting material 13 is preferably the optical cement 30, and when the waveguide cover plate 10 is adhered to the display panel 20, the filling of the through holes 110 can be achieved together in the process of coating the optical cement 30 on the surface of the substrate 11 facing the light incident side, so that the processing procedure is reduced, and the assembly efficiency of the display device 1 is improved.

In some embodiments, please refer to fig. 5, fig. 5 is a schematic cross-sectional view of a waveguide cover plate according to still other embodiments of the present application. The substrate 11 is a light-transmitting substrate, and a light shielding layer 14 is disposed on a surface of the light-transmitting substrate facing the light incident side thereof, the light shielding layer 14 includes a plurality of voids, and the positions of the voids of the light shielding layer 14 correspond to the positions of the through holes 110. Specifically, the substrate 11 is made of a light-transmitting material such as glass, PC (Polycarbonate), PMMA (polymethyl methacrylate), or the like; the light shielding layer 14 is a black matrix layer commonly used in the display field, and is made of a black light absorbing material, and the light shielding layer 14 covers the surface of the substrate 11 facing the light incident side thereof and is used for shielding a gap between two adjacent through holes 110, so that light is prevented from being emitted from the light emergent side of the substrate 11 after passing through the substrate 11 from the gap between the two adjacent through holes 110, light leakage and color crosstalk of a picture displayed by the display device 1 can be effectively prevented, the contrast of the picture displayed by the display device 1 is improved, and the reflectivity of the substrate 11 can be reduced by absorbing light in an external environment.

In some embodiments, as shown in fig. 5, when the substrate 11 is a light-transmitting substrate, a composite optical film 15 is provided on the surface of the light-transmitting substrate facing the light-emitting side. Specifically, the composite optical film 15 is an antireflection film commonly used in the display field, also called an antireflection film; the composite optical film 15 covers the surface of the substrate 11 facing the light-emitting side thereof, and covers the opening of the through-hole 110 on the light-emitting side of the substrate 11. Thereby can enough reduce the reflected light of the surface of base plate 11 towards its light-emitting side, increase the light transmission volume of base plate 11, be favorable to promoting the display effect of display device 1, can improve the hardness and the scratch resistance of base plate 11 again, be favorable to promoting waveguide apron 10's life, can also avoid through-hole 110 to expose in external environment, prevent effectively that through-hole 110 from being blocked up by dust, spot etc. from influencing the display effect, be favorable to promoting waveguide apron 10's isolated water oxygen's ability.

In some embodiments, an antiglare (AG, anti-Glare) treatment is performed on the composite optical film 15. The anti-glare treatment can be performed on the surface of the composite optical film 15 away from the substrate 11, thereby further improving the anti-glare effect of the waveguide cover plate 10.

In some embodiments, the substrate 11 is a light absorbing substrate. That is, the substrate 11 is made of a material having a light absorbing function, such as: colored glass, colored PC flakes, colored PMMA flakes, or the like. Therefore, the light can be prevented from being emitted from the light emitting side of the substrate 11 after passing through the substrate 11 from the gap between two adjacent through holes 110 without arranging the light shielding layer 14, the phenomena of light leakage and color crosstalk of the picture displayed by the display device 1 are effectively prevented, the reflectivity of the substrate 11 can be reduced by absorbing the light in the external environment, and the anti-dazzle effect is achieved.

While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the present application, and that variations, modifications, alternatives and alterations of the above embodiments may be made by those skilled in the art within the scope of the present application, which are also to be regarded as being within the scope of the protection of the present application.

Claims

1. The utility model provides a waveguide apron, includes the base plate, a plurality of through-holes that are array arrangement are seted up to the base plate, the through-hole can with display panel's sub-pixel one-to-one, just be equipped with the reflector layer on the pore wall of through-hole, its characterized in that, the cross-sectional area of through-hole is followed the income light side of base plate reduces gradually the light-emitting side of base plate, the pore wall of through-hole is the part of elliptic curved surface, the through-hole is close to the cross section of base plate light-emitting side is located on the first focal plane of elliptic curved surface.

2. The waveguide cover plate of claim 1, wherein a surface of the substrate facing the light exit side is coplanar with the first focal plane.

3. The waveguide cover plate of claim 1, wherein the through-holes are filled with a light-transmitting material.

4. A waveguide cover plate according to any one of claims 1 to 3, wherein the substrate is a light-transmitting substrate, and a light shielding layer is provided on a surface of the light-transmitting substrate facing the light incident side, the light shielding layer including a plurality of voids, the locations of the voids corresponding to the locations of the through holes.

5. The waveguide cover plate according to claim 4, wherein the light-transmitting substrate is provided with a composite optical film on a surface facing the light-emitting side.

6. The waveguide cover plate of claim 5, wherein the composite optical film is antiglare.

7. A waveguide cover plate according to any one of claims 1 to 3, wherein the substrate is a light absorbing substrate.

8. A display device comprising a display panel and the waveguide cover plate of any one of claims 1 to 7, the waveguide cover plate being located on a light-emitting side of the display panel, a light-emitting surface of a subpixel of the display panel being located on a second focal plane of the elliptical curved surface.

9. The display device of claim 8, wherein the waveguide cover is adhered to a surface of the display panel facing the light-emitting side by an optical adhesive.

10. The display device according to claim 8, wherein the display panel is a liquid crystal panel or an organic light emitting diode panel.