TWI676829B - Polarizer and the display device using the polarizer - Google Patents

Abstract

A polarizer includes an optical adhesive layer, an optical compensation layer, a first protective layer, a polarizing base layer, and a second protective layer. The optical compensation layer is located on the optical adhesive layer. The optical compensation layer has a first surface and a second surface opposite to the first surface. The optical compensation layer has at least one crack prevention groove, the crack prevention groove extends from the first surface toward the second surface, and the extension direction of the crack prevention groove is perpendicular to the stretching direction of the optical compensation layer. The first protective layer is on the optical compensation layer, the polarizing base layer is on the first protective layer, and the second protective layer is on the polarizing base layer. The formation of crack-stop grooves in the optical compensation layer can prevent cracks existing at the edges of the optical compensation layer from being stretched or cut to extend to the position vertically projected on the display area of the display device to maintain the optical characteristics of the display device.

Description

Polarizer and display device using the same

The invention relates to the field of displays, in particular to a polarizer and a display device using the polarizer.

In the display, a polarizer can be transmitted to deflect the emitted light toward a specific direction. Polarizers usually have a multilayer structure, and an optical compensation film is provided in the multilayer to compensate for the phase delay.

Optical compensation film, also known as phase retardation film, can be attached to the display panel through optical glue, but it may be because the thermal expansion and contraction coefficients of the optical compensation film and the optical glue are different, or they are stretched during the process. The stress causes the optical compensation film to generate cracks at the edges of the optical compensation film due to the stress concentration or at the cutting position. When used for a long time, the crack may continue to expand along the stretching direction of the optical compensation layer, and extend to the area of the optical compensation film that is vertically projected on the display area of the display, affecting the overall optical quality.

Here, a polarizer is provided. The polarizer includes an optical adhesive layer, an optical compensation layer, a first protective layer, a polarizing base layer, and a second protective layer. The optical compensation layer is located on the optical adhesive layer. The optical compensation layer has a first surface and a second surface opposite to the first surface. The optical compensation layer has at least one crack stopping groove. The crack prevention groove is formed by the first surface along the second surface, and the extending direction of the crack prevention groove is perpendicular to the stretching direction of the optical compensation layer. The first protective layer is on the optical compensation layer, the polarizing base layer is on the first protective layer, and the second protective layer is on the polarizing base layer.

In some embodiments, the first surface contacts the optical adhesive layer and the second surface contacts In the first protective layer, the depth of the crack prevention groove extends from the first surface toward the second surface, and the crack prevention groove communicates with the first surface and the second surface.

In some embodiments, the first surface is in contact with the optical adhesive layer, the second surface is in contact with the first protective layer, the depth of the crack stop groove extends from the first surface toward the second surface, and the second surface is not connected.

Further, in some embodiments, the crack prevention groove is formed by the optical adhesive layer toward the optical compensation layer, and the crack prevention groove further penetrates the optical adhesive layer.

Here, a display device is also provided. The display device includes a display panel and a polarizing plate. The display panel has a light emitting surface, and the light emitting surface has a display area and a non-display area surrounding the display area. The polarizer is located on the light emitting surface, and the polarizer includes an optical compensation layer, an optical adhesive layer, a first protective layer, a polarizing base layer, and a second protective layer. The optical compensation layer is located on the light emitting surface. The optical compensation layer has a first surface and a second surface opposite to the first surface. The optical compensation layer has at least one crack prevention groove, and the vertical projection position of the at least one crack prevention groove on the display panel is in the area of the non-display area, and the at least one crack prevention groove is formed from the first surface toward the second surface, and the crack prevention The extending direction of the groove is perpendicular to the stretching direction of the optical compensation layer. The optical adhesive layer is located between the optical compensation layer and the display panel, and the optical adhesive layer fixes the optical compensation layer on the light emitting surface. The first protective layer is on the optical compensation layer. The polarizing base layer is located on the first protective layer. The second protective layer is located on the polarizing base layer.

In some embodiments, the first surface contacts the optical adhesive layer and the second surface contacts the first protective layer. The depth of the crack prevention groove extends from the first surface toward the second surface, and the crack prevention groove communicates with the first surface and the second surface.

In some embodiments, the first surface is in contact with the optical adhesive layer, the second surface is in contact with the first protective layer, the depth of at least one crack-stop groove extends from the first surface toward the second surface, and the crack-stop groove is not connected to the second surface. surface.

In some embodiments, the display area has two first edges and two second edges. Two first edges face each other and two second edges face each other. Each first edge and each second edge are connected to each other. The non-display area surrounds the two first edges and two second edges of the display area. The extending direction of the first edge is substantially perpendicular to the stretching direction of the optical compensation layer. The extending direction is substantially parallel to the two first edges.

Furthermore, in some embodiments, the crack arresting groove is formed in the optical adhesive layer and extends into the optical compensation layer, and the crack arresting groove has an extended length greater than or equal to the length of the first edge.

Further, in some embodiments, the display device includes two crack arresting grooves, the two crack arresting grooves are opposite to each other, the two crack arresting grooves are formed in the optical adhesive layer and extend into the optical compensation layer. The extending direction is parallel to the first edge, and the extending direction of the first edge is substantially perpendicular to the stretching direction of the optical compensation layer.

Furthermore, in some embodiments, the optical compensation layer further has two gap grooves, the two gap grooves are located in the optical compensation layer, the position where the two gap grooves are vertically projected on the display panel is in a non-display area, and the two gaps The extending directions of the grooves are all parallel to the second edge. The extending direction of the second edge is substantially parallel to the stretching direction of the optical compensation layer. The two gap grooves are opposite to each other and communicate with the two crack stopping grooves, respectively.

By forming crack-stop grooves in the optical compensation layer, it is possible to control the cracks in the optical compensation layer that are often generated at the edges of the optical compensation layer due to the manufacturing process, or are easily cut and expanded in the direction of the optical compensation layer. Center vertical projection in the area of the non-display area of the display panel. In this way, it is possible to prevent the cracks from extending along the stretching direction of the optical compensation layer to the area vertically projected on the display area of the display panel, thereby preventing the cracks from affecting the display effect.

1‧‧‧ polarizer

10‧‧‧ Optical Adhesive Layer

11‧‧‧ the first side

13‧‧‧ the second side

20‧‧‧ Optical compensation layer

21‧‧‧first surface

23‧‧‧ second surface

25‧‧‧ crack stop

27‧‧‧ clearance slot

30‧‧‧first protective layer

40‧‧‧Polarized base layer

50‧‧‧Second protective layer

5‧‧‧Display Panel

51‧‧‧light surface

510‧‧‧display area

511‧‧‧ first edge

513‧‧‧Second Edge

520‧‧‧non-display area

531‧‧‧first side

533‧‧‧second side

100‧‧‧ display device

A‧‧‧ Formation direction

A1‧‧‧ extension direction

A2‧‧‧Stretching direction

L1‧‧‧Extended length

L2‧‧‧ length

W1‧‧‧ width of crack stop

W2‧‧‧Width of non-display area

W3‧‧‧Width of clearance groove

W4‧‧‧Side edge width of non-display area

The above-mentioned and other exemplary embodiments of the present invention will have more advantages and features that will become more clear by describing the exemplary embodiments of the present invention in further detail with reference to the drawings, in which: FIG. 1 is a schematic cross-sectional view of a first embodiment of a polarizer.

FIG. 2 is a top view of a first embodiment of a polarizer.

3 is a schematic cross-sectional view of a second embodiment of a polarizer.

FIG. 4 is a schematic cross-sectional view of a first embodiment of a display device.

FIG. 5 is a partial exploded view of the first embodiment of the display device.

FIG. 6 is a partial exploded view of the second embodiment of the display device.

FIG. 7 is a partial exploded view of the third embodiment of the display device.

In the drawings, the thicknesses of layers, films, panels, regions, etc. are exaggerated for clarity. Throughout the description, the same reference numerals denote the same elements. It will be understood that when an element such as a layer, film, region, or substrate is referred to as being “on”, “connected to”, or “contacting” another element, it can be directly on the other element, in contact with another element, An element is connected, or in direct contact with another element, or an intermediate element may also be present. In contrast, when an element is referred to as being "directly on," "directly connected to," or "directly in contact with" another element, there are no intervening elements present.

It should be understood that, although the terms "first," "second," "third," etc. may be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, and / or sections, and / Or in part should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a "first element," "component," "region," "layer," or "portion" discussed below may be termed a second element, component, region, layer, or portion without departing from the teachings herein.

Relative terms such as "lower" or "bottom" and "upper" or "top" may be used herein to describe the relationship of one element to another element, as shown. It should be understood that relative terms are intended to include different orientations of the device in addition to the orientation shown in the figures. For example, if a When the device in the drawings is turned over, the elements described as being on the "lower" side of other elements will be oriented on the "upper" side of the other elements. Thus, the exemplary term "down" may include orientations of "down" and "up", depending on the particular orientation of the drawings. Similarly, if the device in one of the figures is turned over, elements described as "below" or "beneath" other elements would then be oriented "above" the other elements. Thus, the exemplary terms "below" or "below" may include orientations above and below.

In order to solve conventional technical problems, a polarizer 1 is provided herein. FIG. 1 is a schematic cross-sectional view of a first embodiment of a polarizer. FIG. 2 is a top view of a first embodiment of a polarizer. As shown in FIGS. 1 and 2, the polarizer 1 includes an optical adhesive layer 10, an optical compensation layer 20, a first protective layer 30, a polarizing base layer 40, and a second protective layer 50.

As shown in FIG. 1 and FIG. 2, the optical adhesive layer 10 is used as a base of the polarizer 1 to further fix the polarizer 1 on other components. The optical compensation layer 20 is located on the optical adhesive layer 10. The optical compensation layer 20 has a first surface 21 and a second surface 23 opposite to the first surface 21. The first surface 21 is fixed on the optical adhesive layer 20. The optical compensation layer 20 has a crack preventing groove 25 formed by the first surface 21 toward the second surface 23. In other words, the depth of the crack stop groove 25 extends from the first surface 21 along the formation direction A toward the second surface 23. As shown in FIG. 2, the polarizer 1 includes two first sides 11 and two second sides 13, and two ends of each first side 11 are respectively connected to two second sides 13. In addition, the crack stop groove 25 extends from the first surface 21 along the extension direction A1. As shown in FIG. 2, the extending direction A1 referred to here is a direction in which the extension direction of the crack stop groove 25 extends. Here, the extending direction A1 of the crack stop groove 25 is perpendicular to the stretching direction A2 of the optical compensation layer 20. The crack stop groove 25 is adjacent to the first side 11 of the polarizer 1. In more detail, the extension direction A1 is substantially parallel to the first side 11, and the extension direction A2 of the optical compensation layer 20 is substantially parallel to the second side 13.

As shown in FIG. 1, the first protective layer 30 contacts the optical compensation layer 20, that is, the first protective layer 30 is bonded to the second surface 23 of the optical compensation layer 20. The polarizing base layer 40 is located on the first protective layer 30. The second protective layer 50 contacts the polarizing base layer 40. That is, the first protective layer 30, the polarizing base The layer 40 and the second protective layer 50 are disposed on the optical compensation layer 20 in a sandwich structure.

As shown in FIG. 1, the first surface 21 contacts the optical adhesive layer 10, and the second surface 23 contacts the first protective layer 30. The depth of the crack prevention groove 25 extends from the first surface 21 toward the second surface 23, that is, the crack prevention groove 25 is formed along the formation direction A, and the crack prevention groove 25 communicates with the first surface 21 and the second surface 23. In this embodiment, the sandwich structure of the first protective layer 30, the polarizing base layer 40, and the second protective layer 50 can be adhered to the optical compensation layer 20 through an adhesive layer, such as a pressure-sensitive adhesive. However, this is merely an example, and the optical compensation layer 20 and the first protective layer 30 may be directly contacted by hot pressing or other methods. In addition, as shown in FIG. 1, the crack prevention groove 25 can be further formed by the optical adhesive layer 10 toward the optical compensation layer 20, and the crack prevention groove 25 can also penetrate the optical adhesive layer 10.

Here, the optical adhesive layer 10 may be Pressure Sensitive Adhesive (PSA), and the optical compensation layer 20 may be a Cyclo Olefin Polymer (COP). Due to the characteristics of the material of the optical compensation layer 20, it is easy to cause the expansion / contraction stress caused by the tensile stress in the stretching direction A2 or the expansion / contraction stress caused by the thermal expansion and contraction coefficients of the optical adhesive layer 10 being inconsistent. A crack occurs at the edge of the stretching or cutting, and the crack may continue to expand along the stretching direction A2 of the optical compensation layer 20 and increase during use. If the crack continues to extend to the area of the display area vertically projected on the display surface, the crack will affect the optical characteristics and display characteristics of the entire display area.

Since the optical compensation layer 20 can be fixed to the release layer (not shown in the figure) through the optical adhesive layer 10 to facilitate storage or shipment, and later, if the polarizing plate 1 is to be attached to other components, the release layer can be removed. Then, the optical adhesive layer 10 is attached to other components. In this regard, when the polarizing plate 1 is fixed to the release layer, the crack stopping groove 25 can be formed by cutting in a forming direction A with a die. Therefore, the crack stop groove 25 can be formed in the release layer, the optical adhesive layer 10, and the optical compensation layer 20. The extension direction A2 of the crack prevention groove 25 is perpendicular to the stretching direction A2 of the optical compensation layer 20. In addition, the formation direction A of the crack prevention groove 25 and the cutting direction of the die can also be perpendicular to the stretching direction A2 and along the extension. square To A1. With the arrangement of the crack-stop groove 25, the stress parallel to the stretching direction A2 can be dispersed and the stress can be prevented from being concentrated on the crack, and the edge of the crack formed on the stretch or cut of the edge of the optical compensation layer 20 can be restricted. Stretching direction A2 expands.

In more detail, even if a small crack is generated at the edge of the optical compensation layer 20 in the stretched or cut position, if it is expanded due to a force, the force will be dispersed by the crack stop groove 25, and the crack will reach the limit. The cracks 25 stop immediately, and no stripe cracks are formed in the optical compensation layer 20 along the stretching direction A2. Therefore, the crack in the optical compensation layer 20 can be restricted to a specific region by the crack stop groove 25. In other words, the position of the crack will be limited to the area where the optical compensation layer 20 is vertically projected in the non-display area of the display device to be attached, and the crack is prevented from extending into the area vertically projected into the display area of the display device. The optical effect of the display area desired by the user will not be affected.

3 is a schematic cross-sectional view of a second embodiment of a polarizer. As shown in FIG. 3, it is different from the first embodiment in that the crack stop groove 25 is formed by the first surface 21 along the forming direction A toward the second surface 23, but the crack stop groove 25 does not communicate with the second surface 23, that is, When the die is cut, the crack stop groove 25 does not penetrate the optical compensation layer 20. In addition, because the optical adhesive layer 10 has adhesiveness, even if the crack stopping groove 25 is generated by cutting with a die, the crack stopping groove 25 may be in the optical adhesive layer because the molecules on both sides of the crack stopping groove 25 are in contact with each other. Part 10 may disappear due to molecular adhesion.

In addition, the material of the first protective layer 30 may be acrylic, that is, poly (methyl methacrylate) (PMMA). The material of the polarizing base layer 40 may be Polyvinyl alcohol (PVA), and the material of the second protective layer 50 may be Triacetyl Cellulose (TAC). The first protective layer 30 and the second protective layer 50 have high mechanical strength and can achieve the effect of protecting the polarizing base layer 40.

FIG. 4 is a schematic cross-sectional view of a first embodiment of a display device. FIG. 5 is a partial exploded view of the first embodiment of the display device. As shown in FIGS. 4 and 5, the display device 100 includes a display device. Display panel 5 and polarizing plate 1. The display panel 5 has a light emitting surface 51. The light emitting surface 51 has a display area 510 and a non-display area 520 surrounding the display area 510. The polarizer 1 is fixed on the light emitting surface 51. The polarizer 1 includes an optical adhesive layer 10, an optical compensation layer 20, a first protective layer 30, a polarizing base layer 40, and a second protective layer 50. Here, in order to clearly show the relative projection relationship between the display panel 5 and the crack stop groove 25 of the optical compensation layer 20, the optical adhesive layer 10, the first protective layer 30, the polarizing base layer 40 and the second protective layer 50 are omitted in FIG. 5. As shown in FIG. 4, the optical compensation layer 20 is fixed on the light emitting surface 51 through the optical adhesive layer 10. The optical compensation layer 20 has a first surface 21 and a second surface 23 opposite to the first surface 21. The optical compensation layer 20 has a crack prevention groove 25, the depth of the crack prevention groove 25 is formed by the first surface 21 along the forming direction A toward the second surface 23, and the crack prevention groove 25 is in the optical compensation layer 20 in an extending direction A1 Extends in the length direction. The crack prevention groove 25 is located in the optical compensation layer 20, and the vertical projection position of the crack prevention groove 25 on the display panel 5 is located in the non-display area 520. In addition, the extending direction A1 of the crack stop groove 25 is perpendicular to the stretching direction A2 of the optical compensation layer 20. The optical adhesive layer 10 is located between the optical compensation layer 20 and the display panel 5. The optical adhesive layer 10 fixes the optical compensation layer 20 on the light emitting surface 51. The first protective layer 30 is located on the optical compensation layer 20. The polarizing base layer 40 is located on the first protective layer 30. The second protective layer 50 is located on the polarizing base layer 40.

Referring again to FIGS. 4 and 5, the first surface 21 is fixed on the light-emitting surface 51 through the optical adhesive layer 10, the second surface 23 contacts the first protective layer 30, and the crack stop groove 25 extends along the forming direction A, and communicates with the first A surface 21 and a second surface 23. here. Further, the crack stop groove 25 may be formed in the optical adhesive layer 10 and extend toward the optical compensation layer 20, and penetrate the optical adhesive layer 10. However, this is only an example and is not intended to be limiting. For example, in the embodiment shown in FIG. 3, the depth of the crack prevention groove 25 extends from the first surface 21 along the forming direction A toward the second surface 23, but the crack prevention groove 25 is not connected to the second surface 23.

Referring again to FIG. 5, the display panel 5 includes a first side 531 and a second side 533. The display area 510 has two first edges 511 and two second edges 513, and two first edges 511 The two edges 513 are opposite to each other, and the first edges 511 and the second edges 513 are connected to each other. When the polarizer 1 is fixed to the display panel 5, the first side 531 is substantially coincident with the first side 11, and the second side 533 is substantially coincident with the second side 13. The first edge 511 is substantially perpendicular to the stretching direction A2 of the optical compensation layer 20, and the second edge 513 is substantially parallel to the stretching direction A2 of the optical compensation layer 20. The "substantially" referred to herein is allowed to be completely parallel or The vertical stretching direction A2 has a partial angular tolerance, for example, 2 degrees to 10 degrees. The non-display area 520 surrounds the first edge 511 and the second edge 513 of the display area 510, and the extending direction A1 of the crack stop groove 25 is substantially parallel to the first edge 511. Further, the extension length L1 of the crack stop groove 25 is greater than or equal to the length L2 of the first edge. Further, as shown in FIG. 5, the vertical projection position of the crack prevention groove 25 on the display panel 5 is in the area of the non-display area 520, and the width W1 of the crack prevention groove 25 is much smaller than the width W2 of the non-display area 520. Here, the width W2 of the non-display area refers to a distance from the first edge 511 of the display area 510 to the first side 531 of the display panel 5.

Thereby, in the cutting process, it is possible to prevent the self-cutting edge of the polarizer 1 from being delayed according to the stretching direction A (that is, toward the display area 510). Furthermore, by providing the crack stop groove 25, it is possible to prevent The slits that can exist at the cutting edge or the stretching edge of the cutting edge of the optical compensation layer 20 extend along the stretching direction A into a region vertically projected on the display area 510 of the display panel 5. Therefore, the crack stop groove 25 is provided in the optical compensation layer 20 so that the cracks generated in the optical compensation layer 20 are limited to a specific range, and the vertical projection range of the specific range on the display panel is located in the non-display area 520 of the display panel 5 However, the optical effect presented by the user when viewing the display area 510 is not affected.

FIG. 6 is a partial exploded view of the second embodiment of the display device. As shown in FIG. 6, FIG. 6 also shows the vertical projection relationship between the optical compensation layer 20 and the display panel 5 in the same manner as in FIG. 5. In the second embodiment, the optical compensation layer 20 includes two crack stopping grooves 25, two. The crack arresting grooves 25 are opposed to each other, and the extension directions A1 of the two crack arresting grooves 25 are parallel to the first edge 511. The cracks that may exist at the edges of the optical compensation layer 20 that are stretched or cut out extend into the area that is perpendicularly projected on the display area 510.

FIG. 7 is a partial exploded view of the third embodiment of the display device. As shown in FIG. 7, FIG. 7 also presents the vertical projection relationship between the optical compensation layer 20 and the display panel 5 in the manner of FIG. 5. In the third embodiment, the optical compensation layer 20 includes two crack-stop grooves 25, Further includes two gap grooves 27. The two gap grooves 27 are located in the optical compensation layer 20, and the position where the two gap grooves 27 are vertically projected on the display panel 5 is located in the non-display area 520. The extending directions of the two gap grooves 27 are parallel to the second edge 513. The two gap grooves 27 are opposite to each other and communicate with the two crack stopping grooves 25 respectively. The tensile stress experienced by the optical compensation layer 20 can be further dispersed by the gap groove 27 and the crack stop groove 25 to avoid concentration, and it can further prevent the cracks that may exist at the edge of the optical compensation layer 20 from being stretched or cut to extend to Projected vertically in the area of the display area 510 of the display panel 5. Further, the vertical projection position of the gap groove 27 on the display panel 5 is in the area of the non-display area 520. Similarly, the width W3 of the gap groove 27 is smaller than the width W4 of the side edge of the non-display area 520. The side edge width W4 refers to a distance from the second edge 513 of the display area 510 to the second side edge 533 of the display panel 5.

The crack stop groove 25 is formed in the optical compensation layer 20, which can be generated in the optical compensation layer 20 at the edge stretching or cutting of the optical compensation layer 20 due to the manufacturing process, and is easy to expand in the stretching direction A2 of the optical compensation layer 20. The crack is controlled in the area of the optical compensation layer 20 that is vertically projected on the non-display area 520 of the display panel 5, thereby preventing the crack from extending to the area that is vertically projected on the display area 510 of the display panel 5, which affects the display effect.

The present invention has been described in connection with exemplary embodiments that are currently considered to be practical, but it should be understood that the present invention is not limited to the disclosed embodiments, but rather, is intended to be applicable to various modifications and equal configurations included in the attached patent application The spirit and scope of the scope.

Claims (12)

A polarizer includes: an optical adhesive layer; an optical compensation layer on the optical adhesive layer; the optical compensation layer has a first surface and a second surface opposite to the first surface; the optical compensation layer has At least one crack prevention groove, the at least one crack prevention groove is formed by the first surface toward the second surface, and an extension direction of the at least one crack prevention groove is perpendicular to a stretching direction of the optical compensation layer; a first A protective layer on the optical compensation layer; a polarizing base layer on the first protective layer; and a second protective layer on the polarizing base layer, wherein each of the crack stopping grooves is adjacent to a first of the polarizer Side, the extending direction is substantially parallel to the first side of the polarizing plate. The polarizer according to claim 1, wherein the first surface is in contact with the optical adhesive layer, the second surface is in contact with the first protective layer, and the depth of the at least one crack stop groove is directed from the first surface toward the second surface. And the at least one crack preventing groove communicates with the first surface and the second surface. The polarizer according to claim 1, wherein the first surface is in contact with the optical adhesive layer, the second surface is in contact with the first protective layer, and the depth of the at least one crack stop groove is directed from the first surface toward the second surface. And the at least one crack stopping groove is not connected to the second surface. The polarizer according to claim 2 or 3, wherein the at least one crack prevention groove is further formed by the optical adhesive layer toward the optical compensation layer, and the at least one crack prevention groove penetrates the optical adhesive layer. A display device includes: a display panel having a light emitting surface, the light emitting mask having a display area and a non-display area surrounding the display area; and a polarizer fixed on the light emitting surface. The polarizer includes : An optical compensation layer on the light emitting surface, the optical compensation layer has a first surface and a second surface opposite to the first surface, the optical compensation layer has at least one crack stop groove, and the at least one crack stop The groove is located in the optical compensation layer, and a vertical projection position of the at least one crack stopping groove on the display panel is in a region of the non-display area. In addition, the at least one crack stopping groove faces from the first surface toward the second surface. Is formed, and an extending direction of the at least one crack-stop groove is perpendicular to a stretching direction of the optical compensation layer, wherein the width of each crack-stop groove is smaller than the width of the non-display area; Between the display panel and the display panel, the optical adhesive layer fixes the optical compensation layer on the light emitting surface; a first protective layer is located on the optical compensation layer; a polarizing base layer is located on the first protective layer; A second protective layer on the polarizing base layer. The display device according to claim 5, wherein the first surface is in contact with the optical adhesive layer, the second surface is in contact with the first protective layer, and the depth of the at least one crack stopping groove is directed from the first surface toward the second surface. And the at least one crack preventing groove communicates with the first surface and the second surface. The display device according to claim 5, wherein the first surface is in contact with the optical adhesive layer, the second surface is in contact with the first protective layer, and the depth of the at least one crack stopping groove is directed from the first surface toward the second surface. And the at least one crack stopping groove is not connected to the second surface. The display device according to claim 6 or 7, wherein the at least one crack prevention groove is further formed by the optical adhesive layer toward the optical compensation layer, and the at least one crack prevention groove penetrates the optical adhesive layer. The display device according to claim 5, wherein the display area has two first edges and two second edges, the two first edges are opposite each other and the two second edges are opposite each other, and each of the first edges and each of the The second edges are connected to each other. The non-display area surrounds the two first edges and the two second edges of the display area. The extending direction of the first edge is substantially perpendicular to the stretching direction of the optical compensation layer. The extending direction of the slit is parallel to the two first edges. The display device according to claim 9, wherein the at least one crack prevention groove is formed in the optical adhesive layer and extends into the optical compensation layer, and the at least one crack prevention groove has a diameter greater than or equal to the first edge. Extend the length. The display device according to claim 9, wherein the at least one crack arresting groove comprises two crack arresting grooves, the two crack arresting grooves are opposite to each other, the two crack arresting grooves are formed in the optical adhesive layer and extend into the optical compensation Layer, and the extension directions of the two crack stopping grooves are parallel to the two first edges. The display device according to claim 11, wherein the optical compensation layer further has two gap grooves, the two gap grooves are located in the optical compensation layer, and are vertically projected in an area of the non-display area of the display panel, and the two gaps The extending directions of the grooves are all parallel to the second edge, the extending directions of the two second edges are substantially parallel to the stretching direction of the optical compensation layer, the two gap grooves are opposite to each other and communicate with the two crack stopping grooves respectively, wherein The width of each of the gap grooves is smaller than the width of one edge of the non-display area.