CN111487809A

CN111487809A - Optical stack structure and display device

Info

Publication number: CN111487809A
Application number: CN201910071299.2A
Authority: CN
Inventors: 孙立洲; 刘俊彬; 林进伟; 林明仁
Original assignee: Hannstar Display Nanjing Corp; Hannstar Display Corp
Current assignee: Hannstar Display Nanjing Corp; Hannstar Display Corp
Priority date: 2019-01-25
Filing date: 2019-01-25
Publication date: 2020-08-04

Abstract

The invention discloses an optical stack structure and a display device. The first optical film is disposed on the uppermost layer of the optical stack structure, and has a first surface and a second surface, and the second surface of the first optical film directly contacts the second optical film. The first optical film is provided with an action area, a bending area and a fixing area, wherein the bending area is positioned between the action area and the fixing area, and the fixing area is directly contacted with the horizontal side edge of the second optical film so as to fix the second optical film. The first surface of the first optical film is provided with optical coatings in the active area and the fixed area, and the first surface is free of the optical coatings in the bending area. Therefore, the optical stack structure can be better fixed.

Description

Optical stack structure and display device

Technical Field

The present invention relates to an optical stack structure, and more particularly, to an optical stack structure and a display device capable of fixing an optical film.

Background

Generally, a liquid crystal display includes a backlight module and a liquid crystal display panel, wherein the backlight module includes a light emitting unit and a plurality of optical films, and the optical films may include a light guide plate, a diffusion sheet, and the like. When assembling the backlight module, the optical films are generally stacked and fixed by using an adhesive tape, but such a method requires a long assembling time. Therefore, how to provide a method for fixing the optical film is a concern of those skilled in the art.

Disclosure of Invention

Embodiments of the present invention provide an optical stack structure that can fix an optical film without using an adhesive tape. The optical stack structure includes a first optical film and a second optical film. The first optical film is disposed on the uppermost layer of the optical stack structure, and has a first surface and a second surface, and the second surface of the first optical film directly contacts the second optical film. The first optical film is provided with an action area, a bending area and a fixing area, wherein the bending area is positioned between the action area and the fixing area, and the fixing area is directly contacted with the horizontal side edge of the second optical film so as to fix the second optical film. The first surface of the first optical film is provided with optical coatings in the active area and the fixed area, and the first surface is free of the optical coatings in the bending area.

In some embodiments, the second optical film has four horizontal sides, and the holding area of the first optical film directly contacts at least two opposing horizontal sides of the four horizontal sides.

In some embodiments, the above optical stack structure further comprises a third optical film, wherein the fixed region of the first optical film directly contacts the horizontal side of the third optical film.

In another aspect, an embodiment of the present invention provides a display device including a backlight module including a light emitting unit and a plurality of optical films stacked on each other. The optical films comprise a first optical film and a second optical film, wherein the first optical film is arranged on the uppermost layer, the first optical film is provided with a first surface and a second surface, and the second surface of the first optical film is directly contacted with the second optical film. The first optical film is provided with an action area, a bending area and a fixing area, wherein the bending area is positioned between the action area and the fixing area, and the fixing area is directly contacted with the horizontal side edge of the second optical film so as to fix the second optical film.

In some embodiments, the plurality of optical films further includes a third optical film, wherein the fixed region of the first optical film directly contacts the horizontal side of the third optical film.

In some embodiments, the light emitting unit is located at a light receiving side of the optical film, and a length of the fixing region of the first optical film at the light receiving side is smaller than a length of the fixing region at the other sides.

In some embodiments, the display device further includes a frame and a fixing member, wherein the fixing member is disposed between the fixing region of the first optical film and the frame.

In some embodiments, the optical film comprises a light guide plate, a diffuser, or a prism.

In some embodiments, the first surface is provided with an optical coating in the active region and the fixed region, and the first surface is free of the optical coating in the bending region.

Compared with the prior art, the optical stack structure and the display device can fix the optical film without using an adhesive tape, thereby having a better fixed optical stack structure.

In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.

Drawings

Fig. 1 is a side sectional view illustrating a display device according to an embodiment.

Fig. 2 is an enlarged schematic view of the region a in fig. 1 according to an embodiment.

FIG. 3 is a schematic perspective view illustrating an optical film stack according to an embodiment.

Fig. 4 is a cross-sectional side view of a display device according to an embodiment.

FIG. 5 is a side view depicting an optical stack structure according to an embodiment.

Detailed Description

As used herein, "first," "second," …, etc., do not denote any order or sequence, but rather are used to distinguish one element or operation from another element or operation described in the same technical language.

Fig. 1 is a side sectional view illustrating a display device according to an embodiment. Referring to fig. 1, a display device 100 includes a frame 110, a backlight module and a back plate 130, wherein the backlight module includes optical films 121-126 and a light emitting unit 127 stacked one on another. For simplicity, all elements of the display device 100 are not shown in fig. 1, for example, the display device 100 may further include a liquid crystal display panel and/or a touch module. In this embodiment, the display device 100 is actually a television, but in other embodiments, a smart phone, a notebook computer, a tablet computer, a vehicle-mounted computer, or any other type of display device may be used.

The frame 110 and the back plate 130 may be made of metal, plastic, or any suitable material. The light emitting unit 127 includes, for example, a light emitting diode or other element that can emit a light source. The optical films 121-126 may include prisms, diffusers, light guides, or other suitable optical films. For example, the optical film 126 may be a reflective sheet, the optical film 125 may be a light guide plate, the optical film 124 may be a lower diffuser, the

optical films

122 and 123 may be prisms, and the optical film 121 may be an upper diffuser, but the invention is not limited thereto.

In this embodiment, the optical film 121 (also referred to as a first optical film) on the uppermost layer may be bent downward to contact the horizontal side of the optical film 122 (also referred to as a second optical film), thereby fixing the optical film 122. Specifically, referring to fig. 2, fig. 2 is an enlarged schematic view of a region a in fig. 1 according to an embodiment. The optical film 121 has a first surface 121a and a second surface 121b disposed opposite to each other, and the optical film 122 also has a first surface 122a and a second surface 122b disposed opposite to each other, wherein the second surface 121b directly contacts the first surface 122 a. The optical film 122 further has a horizontal side 122c, and the horizontal side 122c is directly connected to the first surface 122a and the second surface 122 b. The optical film 121 has an active region 141, a bending region 142 and a fixed region 143, wherein the bending region 142 is located between the active region 141 and the fixed region 143. The active region 141 is used to provide the function of the optical film 141, such as diffusing light, and in some embodiments, the optical film 121 is not bent in the active region 141. The optical film 121 may be bent at a predetermined angle (e.g., 90 degrees) in the bending region 142. The fixing region 143 extends downward and directly contacts the horizontal side 122c of the optical film 122 to fix the optical film 122, so that no adhesive tape is required, and the time for manufacturing the backlight module can be saved. In some embodiments, the fixing region 143 may further extend downward to directly contact the horizontal side 123c of the optical film 123, the horizontal side 124c of the optical film 124, and the horizontal side 125c of the optical film 125, which may provide better fixing capability.

It is noted that the optical film 122 has four horizontal sides, but fig. 2 shows an enlarged view of only one horizontal side, and in some embodiments, the optical film 121 has bending regions and fixing regions on all four horizontal sides, and the fixing regions can directly contact at least two horizontal sides of the optical film 122. For example, FIG. 3 is a schematic perspective view illustrating an optical film stack according to one embodiment. Referring to fig. 3, the optical film 121 has bending

regions

142, 303 and

fixing regions

143, 301, 302 (the other fixing region is hidden and not shown), wherein the

fixing regions

143, 301 are disposed opposite to each other. In this embodiment, the optical film 122 has 4 horizontal sides, and the four horizontal sides are all covered by the corresponding fixing regions and are not shown in fig. 3. In addition, the light emitting unit 127 is located on a light receiving side of the optical films 121-125, and the length of the fixing area 302 of the optical film 121 on the light receiving side is smaller than the length of the

fixing areas

143, 301, so that the fixing area 302 does not block the light emitted by the light emitting unit 127.

In some embodiments, the optical film 121 has only two sides with

fixed zones

143, 301, and no fixed zones on the other two sides. Only two horizontal sides of the optical film 122 directly contact the

fixing regions

143, 301, which may also achieve the fixing effect.

Fig. 4 is a cross-sectional side view of a display device according to an embodiment. In the embodiment of fig. 4, the display device 400 includes

frames

411 and 412 and fixing

members

431 and 432. Compared to fig. 1 and 2, the

fixing members

431 and 432 are added, the fixing member 431 is disposed between the frame 411 and the fixing area 301, and the fixing member 432 is disposed between the frame 412 and the fixing area 143. The

fixing members

431 and 432 may be formed of rubber or other suitable material for fixing the optical film 121 against the

rims

411 and 412, respectively.

FIG. 5 is a side view depicting an optical stack structure according to an embodiment. Referring to fig. 5, the optical stack structure 500 includes

optical films

510, 520, 530, 540, and 550, which may be prisms, a diffuser, a light guide plate, or other suitable optical films, but the invention is not limited thereto. In this embodiment, the top optical film 510 is bent downward to contact and secure the other optical films. Specifically, the optical film 510 has a first surface 510a and a second surface 510 b. The optical film 520 has a first surface 520a, a second surface 520b, and a horizontal side 520c, wherein the horizontal side 520c directly connects the first surface 520a and the second surface 520 b. The second surface 510b of the optical film 510 is directly contacted with the first surface 520a of the optical film 520. In addition, the optical film 510 has an active region 561, a bending region 562 and a fixing region 563, wherein the bending region 562 is located between the active region 561 and the fixing region 563, and the fixing region 563 directly contacts the horizontal side 520c of the optical film 520 to fix the optical film 520. In some embodiments, the anchor regions 563 may also extend downward to directly contact the horizontal sides of the

optical films

530, 540, 550.

The first surface 510a of the optical film 510 is provided with optical coatings, for example, for diffusing light, but the invention is not limited to the use of the optical coatings. Specifically, the first surface 510a of the optical film 510 is provided with the

optical coatings

571 and 572 in the active area 561 and the fixed area 563, respectively, but particularly, the first surface 510a of the optical film 510 is not provided with the optical coatings in the bending area 562, so as to avoid affecting the optical coatings when bending. Similar to the embodiment of fig. 3 described above, optical film 510 may have a fixed area on four sides, optical film 520 has four horizontal sides, and the fixed area of optical film 510 may directly contact at least two opposing horizontal sides of optical film 520.

In this embodiment, the optical stack structure 500 of fig. 5 can be applied to the display devices of fig. 1 and fig. 4, but in other embodiments, the optical stack structure 500 can also be applied to other optical devices, such as any optical measuring instrument, optical sensor, and the like.

Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.

Claims

1. An optical stack, comprising:

a first optical film disposed on an uppermost layer of the optical stack structure, the first optical film having a first surface and a second surface, the second surface of the first optical film directly contacting the second optical film,

wherein the first optical film has an active region, a bending region and a fixing region, the bending region is located between the active region and the fixing region, the fixing region directly contacts with the horizontal side of the second optical film to fix the second optical film,

wherein the first surface is provided with an optical coating in the active region and the fixation region, the first surface being free of the optical coating in the bending region.

2. The optical stack of claim 1, wherein the second optical film has four of the horizontal sides, and the fixed region of the first optical film directly contacts at least two opposing horizontal sides of the four horizontal sides.

3. The optical stack of claim 2, further comprising a third optical film, wherein the fixed area of the first optical film directly contacts a horizontal side edge of the third optical film.

4. A display device, comprising:

a backlight module, wherein the backlight module includes a light emitting unit and a plurality of optical films stacked on one another, the plurality of optical films including a first optical film and a second optical film, the first optical film being disposed at an uppermost layer, the first optical film having a first surface and a second surface, the second surface of the first optical film directly contacting the second optical film,

the first optical film is provided with an action area, a bending area and a fixing area, the bending area is positioned between the action area and the fixing area, and the fixing area is in direct contact with the horizontal side edge of the second optical film so as to fix the second optical film.

5. The display device of claim 4, wherein the second optical film has four of the horizontal sides, and the fixed region of the first optical film directly contacts at least two opposing horizontal sides of the four horizontal sides.

6. The display device of claim 5, wherein the plurality of optical films further comprises a third optical film, wherein the fixed area of the first optical film directly contacts a horizontal side edge of the third optical film.

7. The display device according to claim 4, wherein the light emitting unit is located on a light receiving side of the plurality of optical films, and a length of the fixing region of the first optical film on the light receiving side is smaller than a length of the fixing region on the other side.

8. The display device according to claim 4, further comprising a frame and a fixing member, wherein the fixing member is disposed between the fixing region of the first optical film and the frame.

9. The display device of claim 4, wherein the plurality of optical films comprise a light guide plate, a diffuser, or a prism.

10. The display device of claim 4, wherein the first surface is provided with an optical coating in the active area and the fixed area, and the first surface is free of the optical coating in the bending area.