TWI671546B - Optical film and display module - Google Patents

Abstract

The invention provides an optical film and a display module. The optical film includes a first light guide layer, a second light guide layer, and at least one light absorbing member. The first light guide layer has a first light incident surface, a first light exit surface, and an accommodating recess formed on the first light incident surface. The second light guiding layer is disposed on the first light incident surface, and has a second light incident surface, a second light emitting surface, and a light guiding member formed on the second light emitting surface. Each light guide is disposed in each receiving recess, and each light guide has a top, a bottom, and a side connecting the top and the bottom. The side of the light guide is facing the inner wall surface of the accommodating recess, and the bottom of the light guide is corresponding to the opening of the recess of the accommodating recess. The light absorbing member covers the sides. The first light guide layer has a first refractive index, and the second light guide layer has a second refractive index which is smaller than the first refractive index.

Description

Optical film and display module

The present invention relates to an optical film and a display module, and more particularly, to an optical film and a display module that increase the light emission angle.

In the conventional liquid crystal display, when the liquid crystal molecules are arranged vertically in the dark state, the birefringence property of the liquid crystal molecules may allow light with a larger incident angle to pass through and exit the screen, causing the display to leak light at a large viewing angle.

In view of the above problems, a technical solution is provided in the prior art. An optical film layer having an optical lens structure is provided on the light-emitting surface of the liquid crystal layer. The optical lens structure has a lower refractive index than the optical film layer, which can increase the output of incident light. Angle to diverge the incident beam. However, the optical lens in the above technical solution has disadvantages. For example, when the light is incident from the side of the optical lens at a larger incident angle, since the medium with a higher refractive index is incident from a medium with a lower refractive index, the light will be on the side of the lens structure when the incident angle exceeds a critical value. Total reflection occurs, and the reflected light is emitted toward the front viewing direction of the display, thereby reducing the contrast in the front viewing direction.

Consistent with the foregoing, one of the objectives of the present invention is to provide an optical film and a display module in response to the shortcomings of the prior art, which can make the structure that diverges incident light beams enhances the contrast in the front view direction.

One of the technical solutions provided by the embodiments of the present invention is to provide an optical film for a display module. The optical film includes a light guide layer, at least one light guide member, and at least one absorber. Light pieces. The light guide layer has a light incident surface, a light emitting surface opposite to the light incident surface, and at least one accommodating recess formed on the light incident surface, wherein the accommodating recess has an inner wall surface and a recess opening. Each light guide is disposed in each receiving recess, and each light guide has a top, a bottom away from the top, and a side connecting the top and the bottom. The side of the light guide is facing the inner wall surface of the accommodating recess, and the bottom of the light guide is corresponding to the opening of the recess of the accommodating recess. At least one light absorbing member is disposed between a side surface of the at least one light guiding member and the light guiding layer, and the light absorbing member covers the side surface. The light guide layer has a fourth refractive index, and each light guide has a fifth refractive index, and the fourth refractive index is greater than the fifth refractive index.

Another technical solution provided by the embodiments of the present invention is to provide a display module including a display panel and the optical film as described above. The display panel has a display surface, and the optical film is disposed on the display surface, and the light incident surface faces the display surface.

Another technical solution provided by the embodiments of the present invention is to provide an optical film for a display module. The optical film includes a first light guide layer, a second light guide layer, and at least one light absorbing member. The first light guide layer has a first light incident surface, a first light emitting surface opposite to the first light incident surface, and at least one receiving recess formed on the first light incident surface, wherein the receiving recess has an inner wall surface and a recess. Opening. The second light guiding layer is disposed on the first light incident surface. The second light guiding layer has a second light incident surface, a second light emitting surface opposite to the second light incident surface, and at least one light guide formed on the second light emitting surface. Each light guide is disposed in each receiving recess, and each light guide has a top, a bottom away from the top, and a side connecting the top and the bottom. The side of the light guide is facing the inner wall surface of the accommodating recess, and the bottom of the light guide is corresponding to the opening of the recess of the accommodating recess. At least one light absorbing member is disposed between a side surface of the at least one light guiding member and the first light guiding layer, and the light absorbing member covers the side surface. The first light guide layer has a first refractive index, the second light guide layer has a second refractive index, and the first refractive index is greater than the second refractive index.

Another technical solution provided by the embodiments of the present invention is to provide a display module including a display panel and the optical film as described above. The display panel has a display surface. The learning film is disposed on the display surface, and the second light incident surface faces the display surface.

In order to further understand the features and technical contents of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings provided are only for reference and description, and are not intended to limit the present invention.

Z‧‧‧Display Module

D‧‧‧Display Panel

S‧‧‧ display surface

U, U’‧‧‧ optical film

1‧‧‧first light guide layer

1’‧‧‧ light guide layer

101‧‧‧First entrance surface

101’‧‧‧ entrance surface

101a, 101a’‧‧‧ connection area

102‧‧‧First light surface

102’‧‧‧light surface

103, 103'‧‧‧ receiving recess

1031, 1031’‧‧‧ inner wall surface

1032, 1032 ’‧‧‧ recess opening

2‧‧‧second light guide layer

201‧‧‧Second light entrance

202‧‧‧Second light emitting surface

21, 21’‧‧‧ light guide

211, 211’‧‧‧ top

212, 212’‧‧‧ bottom

213, 213’‧‧‧ side

3, 3’‧‧‧ light absorbing member

H‧‧‧light guide height

T‧‧‧Light guide thickness

L‧‧‧light

θ ₂ ‧‧‧ incident angle

Y‧‧‧ light guide axial direction

X‧‧‧ Orientation

C‧‧‧ Tangent

FIG. 1 is a schematic perspective view of a display module according to a first embodiment of the present invention.

FIG. 2 shows an enlarged schematic view of the optical film of the first embodiment of the present invention.

FIG. 3 shows a partially enlarged view of FIG. 2.

FIG. 4 shows the contrast of the optical film of FIG. 3 and the optical film without the light absorbing member at different viewing angles.

FIG. 5 shows an enlarged schematic view of a modified embodiment of the optical film of the first embodiment of the present invention.

FIG. 6 shows the contrast of the optical film of FIG. 5 and the optical film without the light absorbing member at different viewing angles.

FIG. 7 shows an enlarged schematic view of another modified embodiment of the optical film according to the first embodiment of the present invention.

FIG. 8 shows the contrast of the optical film of FIG. 7 and the optical film without the light absorbing member at different viewing angles.

FIG. 9 shows an enlarged schematic view of another modified embodiment of the optical film of the first embodiment of the present invention.

FIG. 10 shows the contrast of the optical film of FIG. 9 and the optical film without the light absorbing member at different viewing angles.

FIG. 11 shows an enlarged schematic view of another modified embodiment of the optical film according to the first embodiment of the present invention.

FIG. 12 shows the contrast of the optical film of FIG. 11 and the optical film excluding the light absorbing member at different viewing angles.

FIG. 13 shows an enlarged schematic view of another modified embodiment of the optical film of the first embodiment of the present invention.

FIG. 14 shows the contrast of the optical film of FIG. 13 and the optical film excluding the light absorbing member at different viewing angles.

FIG. 15 shows a partially enlarged schematic diagram of the optical film according to the first embodiment of the present invention.

FIG. 16 shows an enlarged schematic view of an optical film according to a second embodiment of the present invention.

The embodiments of the optical film and the display module disclosed in the present invention will be described below through specific embodiments in conjunction with FIGS. 1 to 16. Those skilled in the art can understand the advantages and effects of the present invention from the contents disclosed in this specification. However, the content disclosed below is not intended to limit the protection scope of the present invention, and those skilled in the art can implement the present invention in different embodiments based on different viewpoints and applications without departing from the principle of the concept of the present invention. In addition, it should be stated in advance that the drawings of the present invention are only schematic illustrations, and are not depicted in actual dimensions. In addition, although the terms first, second, third, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are mainly used to distinguish components.

First embodiment

The optical film U and the display module Z provided by the present invention will be described below with reference to the illustrated embodiments. First, referring to FIG. 1, this embodiment provides a display module Z and an optical film U applied to the display module Z. The display module Z has a display panel D and an optical film U. The optical film U is used to be disposed on the display surface S of the display panel D. The display module Z is preferably a liquid crystal display module, however, the present invention is not limited thereto.

FIG. 2 is a schematic cross-sectional view of the optical film U in FIG. 1 along a section line A-A. As shown in FIG. 2, the optical film U includes a first light guide layer 1, a second light guide layer 2, and a light absorbing member 3. The first light guiding layer 1 has a first light incident surface 101, a first light emitting surface 102 opposite to the first light incident surface 101, and an accommodating recess 103 formed on the first light incident surface 101. The second light guiding layer 2 is disposed on the first light incident surface 101 and has a second light incident surface 201, a second light emitting surface 202 opposite to the second light incident surface 201, and a light guide formed on the second light emitting surface 202. Piece 21. It should be noted that FIG. 2 is an enlarged schematic diagram of the optical film U, in which only two light guides 21 are shown as an example. In practical applications, the present invention does not limit the number of the light guides 21.

Please refer to FIG. 2 and FIG. 3 for cooperation, where FIG. 3 is a partially enlarged schematic diagram of FIG. 2. In detail, the accommodating recess 103 has an inner wall surface 1031 and a recess opening 1032; the light guide 21 has a top 211, a bottom 212, and a side 213 connecting the top 211 and the bottom 212, and each of the light guides 21 faces inward with the side 213 The wall surface 1031 and the bottom portion 212 are respectively provided in each of the accommodating recesses 103 in a manner corresponding to the recess openings 1032. Specifically, in this embodiment, the cross section of the light guide 21 is trapezoidal, and its side surface 213 is inclined toward the axial direction Y. The shape of the inner wall surface 1031 roughly matches the shape of the light guide 21, and the inner wall surface 1031 is inclined toward the light guide 21. Axial direction Y. The light guides 21 may be distributed on the second light emitting surface 202 in a regular or irregular shape, and viewed from an upper perspective, the light guides 21 may be distributed in a dot shape or a strip shape. The light absorbing member 3 is disposed between the side surface 213 of the light guide 21 and the first light guide layer 1, and covers the side surface 213 of the light guide 21.

In the structures of FIGS. 2 and 3, the first light guide layer 1 has a first refractive index, and the second light guide layer 2 has a second refractive index, and the first refractive index is greater than the second refractive index. As shown in the traveling direction of the light ray L in FIG. 2, as the first refractive index is greater than the second refractive index, the light ray L entering the light guide 21 from the second light incident surface 201 may deviate from the axial direction of the light guide 21. Y refracts to diffuse incident light L. Further, the light absorbing member 3 is formed of a light absorbing material, and can absorb the light L entering the light guiding member from the side 213, as shown in the traveling direction of the light L in FIG. 3, thereby preventing the light L from being on the side 213 undergoes total reflection and is refracted X in the frontal direction. In this embodiment, the light absorbing member 3 has a third refractive index, and the third refractive index is equal to the first refractive index, thereby preventing light L from being caused by the refractive index at the boundary between the first light guide layer 1 and the light absorbing member 3. The difference results in total reflection with X-refraction in the frontal direction. The light absorbing member 3 may be formed on the light guide 21 by, for example, a deposition or exposure development process; however, the present invention is not limited thereto.

Please refer to FIG. 4, which shows the contrast of the optical film U of the present embodiment and the optical film U of the light absorbing member 3 at different viewing angles. The optical film U of the present embodiment is indicated by a solid line; the light absorbing member is removed The data of the optical film U of 3 is shown by a dotted line. In FIG. 4, the angle of view θ is in degrees, and the contrast ratio (CR) is the brightness contrast value when the display module Z displays black and white. As shown in the figure, the peak value of the solid line is 2524 and the peak value of the dotted line is 2146, which indicates that the optical film U provided with the light absorbing member 3 on the side 213 of the light guide 21 and the optical film excluding the light absorbing member 3 when the viewing angle θ is zero degrees The film U has a higher front-view contrast. Specifically, the aforementioned “frontal contrast” refers to the respective brightness contrast when the display module Z displays black and white when the viewing angle θ is zero degrees.

It should be noted that, in this embodiment, the third refractive index is equal to the first refractive index; however, the present invention is not limited thereto. In a modified embodiment of the present invention, the third refractive index may preferably be any value within a range larger than the second refractive index and smaller than the first refractive index. Specifically, when the refractive index of the light absorbing member 3 is less than or equal to the second refractive index, when the light enters the light absorbing member 3 from the first light guide 21, a part of the light is totally reflected and refracted in the frontal direction X, thereby reducing Face up to the contrast. In addition, when the refractive index of the light absorbing member 3 is less than or equal to the second refractive index, and when the light L enters the first light guide layer 1 from the top of the light absorbing member 3, the light is refracted in the frontal direction X, thereby generating the inverse effect of reducing the frontal contrast . On the other hand, if the refractive index of the light absorbing member 3 is greater than the first refractive index, the light is likely to be reflected multiple times in the light absorbing member 3 and is directed to the front direction X, or the light enters the first light guide layer from the light absorbing member 3 At 1 o'clock, the frontal contrast is reduced due to X-refraction in the frontal direction. therefore, In a preferred embodiment of the present invention, the third refractive index is greater than the second refractive index and less than or equal to the first refractive index. In this way, the light absorbing member 3 can effectively absorb the light that is returned to the front view from the side 213, thereby further improving the optical film U. Frontal contrast.

Please refer to FIG. 5, which shows an optical film U according to a modified embodiment of the present invention. In this modified embodiment, the light absorbing member 3 is further disposed on the connection region 101 a between the two receiving recesses 103 on the first light incident surface 101. Specifically, as shown in FIG. 5, the connection region 101 a is located between two adjacent recess openings 1032, and the light absorbing member 3 extends from the side 213 of the light guide 21 to cover the connection region 101 a so that the connection region 101 a is separated by The light absorbing member 3 is adjacent to the second light emitting surface 202. Viewed from a top perspective, the light guides 21 and the second light emitting surface 202 distributed between the light guides 21 in a dot-shaped or stripe-shaped manner can be regarded as being covered by the light absorbing member 3. In this modified embodiment, the light absorbing member 3 is also provided in the connection area 101a. Compared with the foregoing embodiment, it can further absorb the light incident at the connection between the light guide 21 and the second light emitting surface 202, and further improve the optical film. U's frontal contrast.

FIG. 6 shows the contrast of the optical film U (indicated by a solid line) of FIG. 5 and the optical film U (indicated by a dotted line) excluding the light absorbing member 3 at different viewing angles. In FIG. 6, the angle of view θ is in degrees, and the contrast ratio (CR) is the brightness contrast value when the display module Z displays black and white. It can be seen from FIG. 6 that the peak of the solid line is 2556 and the peak of the dotted line is 2146, which indicates that the optical film U with the light absorbing member 3 in this embodiment has a higher front view than the optical film U with the light absorbing member 3 removed. Contrast.

Please refer to FIG. 7 and FIG. 8 for cooperation. The present invention does not limit the shape of the light guide 21. In the modified embodiment shown in FIG. 7, the cross section of the light guide 21 may be triangular. Specifically, viewed from an upper perspective, the light guide 21 may be in a stripe or dot distribution, and in the case of a point distribution, the light guide 21 in this embodiment may be a cone or a quadrangular pyramid. The invention is not limited to this. As shown in FIG. 8, the contrast CR of the optical film U (represented by a solid line) with the light absorbing member 3 is 1595 at a viewing angle of zero degrees. Its perspective is The peak value at zero is 1167, which indicates that the optical film U with the light absorbing member 3 has a higher frontal contrast than the optical film U without the light absorbing member 3.

In another modified embodiment of the present invention, the cross section of the light guide 21 of the optical film U may be a columnar shape with a concave side surface, and viewed from an upper perspective, the light guide 21 may be distributed in a stripe or dot shape. Distribution, as shown in Figure 9. As shown in FIG. 10, in this modified embodiment, the optical film U (shown by a solid line) having the light absorbing member 3 has a higher front view than the optical film U (shown by a broken line) excluding the light absorbing member 3. Contrast. In addition, please refer to FIG. 4 and FIG. 10. Compared with the trapezoidal light guide 21 in FIG. 2, the columnar light guide 21 with a concave side according to this modified embodiment can achieve a higher frontal contrast (FIG. 10 (The front view contrast shown is 2828, and the front view contrast shown in FIG. 4 is 2524). This is because the columnar light guide 21 having a concave side surface makes the path of the light incident on the side surface 213 in the light absorbing member 3 longer, and the frontal contrast can be improved more effectively.

In another modified embodiment of the present invention, the light guide 21 of the optical film U may be a trapezoidal combination of two different slopes when viewed from the side. The slope with a smaller slope is closer to the second light emitting surface 202, as shown in FIG. 11 is shown. For example, viewed from an upper perspective, the light guide 21 may be a stripe or a point distribution, and in the case of a point distribution, the light guide 21 may be a truncated cone or truncated from a three-dimensional perspective. Tetrahedron, the present invention is not limited thereto. FIG. 12 shows the frontal contrast of the optical film U of FIG. 11 and the optical film U excluding the light absorbing member 3 at different viewing angles. Please refer to FIG. 4 and FIG. 12. Compared with the trapezoidal light guide 21, the light guide 21 of this modified embodiment has a larger slope area, which can better improve the frontal contrast (the frontal contrast shown in FIG. 12 is 2822, the frontal contrast shown in Figure 4 is 2524).

In another modified embodiment of the present invention, as shown in FIG. 13, the light guide 21 may be formed in a concave shape on a trapezoidal inclined surface as viewed from the side. Compared with the modified embodiment of FIG. 11, this modified embodiment has a larger bevel area, so it can provide higher front view contrast, as shown in FIG. 14, where the optical film of this modified embodiment is shown in FIG. 14. U (represented by a solid line) Contrast CR at different viewing angles θ with the optical film U (indicated by a dashed line) of this embodiment excluding the light absorbing member 3; the peak value of the solid line is 3160, which represents the frontal contrast of the optical film U of the present modified example. 3011, which shows the front-view contrast of the optical film U in this modified embodiment except that the light absorbing member 3 is removed.

Referring to FIG. 15, in this embodiment, the light absorbing member 3 has a maximum thickness T. In this embodiment, the maximum thickness T refers to the thickness of the light absorbing member 3 in a direction parallel to the second light emitting surface 202. The maximum thickness T meets the following relationship:

Please refer to FIG. 15. In the above formula, H is a distance between the top 211 and the bottom 212 of the light guide 21, n _{1 is} the first refractive index, n _{2 is} the second refractive index, θ ₂ is an incident angle of a light from the second light guide layer 2 to the first light guide layer 1, and φ is an angle between all lines C on the side and the bottom 212. In this embodiment, the tangent line C is a tangent line along the side surface 213 of the light guide 21. In other embodiments, when the side surface 213 of the light guide 21 is not a plane, for example, a convex or concave curved surface, the maximum The light ray L that enters the light absorbing member 3 and has a unique intersection with the side surface 213 of the light guide 21 at the incident angle θ ₂ can be regarded as overlapping with the tangent line C described above.

As shown in FIG. 15, specifically, the maximum incident angle θ ₂ refers to an incident angle when the light ray L is incident from the bottom edge of the light absorbing member 3 and is emitted from the edge of the top 211 of the light guide 21. When the thickness of the light absorbing member 3 is close to the maximum value in the above relational expression, the light absorbing member 3 can absorb all light that may cause total reflection on the side of the light guide, so that the best light absorption effect and the effect of improving the frontal contrast can be achieved. It can be understood that if the thickness of the light absorbing member 3 exceeds the above maximum value, it will additionally absorb light that would not otherwise have been totally reflected, thereby causing the transmittance of the first light guide layer 1 to decrease, and increasing the contrast of the front view and No help.

With the above-mentioned technical means, the optical film U light absorbing member 3 of this embodiment can absorb the light that enters the light guide 21 from the side 213, and reduces the total reflection of the light L on the side 213. Rate to increase the front-view contrast of the display module Z. And in this embodiment, the refractive index of the light absorbing member 3 is equal to the refractive index of the first light guide layer 1 to avoid total reflection of light entering the side surface 213 of the light guide 21 from the first light guide layer 1.

Second embodiment

Please refer to FIG. 16. The main difference between this embodiment and the previous embodiment is that the optical film U provided in the foregoing embodiment has a first light guide layer 1 and a second light guide layer 2, and a plurality of light guide members 21 are formed on The second light-emitting surface 202 of the second light-guiding layer 2; the optical film U 'in this embodiment includes only one light-guiding layer 1', and a plurality of light-guiding members 21 'are formed in the light-guiding layer 1'. Each accommodating recess 103 in the light surface 101 '. In this embodiment, the light guide 21 ′ is also disposed on the accommodating recess 103 ′ such that the side surface 213 ′ faces the inner wall surface 1031 ′ of the accommodating recess 103 ′ and the bottom 212 ′ corresponds to the recess opening 1032 ′. 'Has a fourth refractive index n ₄ , the light guide 2' has a fifth refractive index n ₅ , the fourth refractive index n _{4 is} greater than the fifth refractive index n ₅ , and the light absorbing member 3 'covers the side 213 of the light guiding member 21''. As in the first embodiment, this embodiment may have a modified embodiment in which the light absorbing member 3 'extends beyond the side 213' and covers the connection area 101a ', and the light guide 2' in this embodiment may also have the same Changes in shape are not limited to the present invention.

To sum up, the optical film (U, U ') and the display module Z provided in the embodiment of the present invention are respectively provided in each receiving recess (103, 103) by "each light guide (21, 21')". ")", "The light absorbing member 3 'is disposed between the side surface 213' of the light guide 21 'and the light guide layer 1', and the light absorbing member 3 'covers the side surface 213'" and "the light absorbing member 3 is provided on the light guide 21 The technical solution between the side 213 of the first light guide layer 1 and the light absorbing member 3 covers the side 213 ″ to reduce the total incidence of light L when entering the side (213, 213 ') of the light guide (21, 21'). The probability of reflection further improves the front-view contrast of the display module Z.

In addition, in the embodiment of the present invention, the refractive index n ₃ of the light absorbing member 3 is equal to the refractive index n _{1 of the} first light guiding layer 1, and the refractive index n ₆ of the light absorbing member 3 ′ and the refractive index of the light guiding layer 1 ′ are equal. n _{4 is the} same, which can further reduce the total reflection of the light L on the interface between the first light guide layer 1 and the light absorbing member 3 and the interface between the light guide layer 1 ′ and the light absorbing member 3 ′, and further improve the front view contrast of the display module Z. The light absorbing member 3 may be further disposed between the connecting areas 101 a between the two receiving recesses 103 on the first light incident surface 101, or the light absorbing member 3 ′ may be further disposed between the two receiving recesses 103 ′ on the light incident surface 101 ′. Connection region 101a 'to further enhance the frontal contrast of the optical film (U, U').

The content disclosed above is only the preferred and feasible embodiment of the present invention, and therefore does not limit the scope of patent application of the present invention. Therefore, any equivalent technical changes made using the description and drawings of the present invention fall into the application of the present invention. Within the scope of the patent.

Claims (10)

An optical film for a display module. The optical film includes: a light guide layer having a light incident surface, a light emitting surface opposite to the light incident surface, and at least one formed on the light incident surface. The accommodating recess, wherein the at least one accommodating recess has an inner wall surface and a recess opening; at least one light guide, the at least one light guide is respectively disposed on the at least one accommodating recess, and the at least one light guide There is a top, a bottom away from the top, and a side connecting the top and the bottom, wherein the side of the at least one light guiding member faces the inner wall surface of the at least one receiving recess, and the at least one light guiding member The bottom corresponds to the recess opening of the at least one accommodating recess; and at least one light absorbing member, the at least one light absorbing member is disposed between the side of the at least one light guiding member and the light guiding layer, and the light absorbing member Covering the side surface, wherein the light guiding layer has a fourth refractive index, the at least one light guiding member has a fifth refractive index, the fourth refractive index is greater than the fifth refractive index, and the at least one light absorbing member has A sixth refractive index, the first A refractive index not greater than the fourth refractive index not less than the fifth refractive index. The optical film according to claim 1, wherein the at least one light absorbing member has a sixth refractive index, and the sixth refractive index is equal to the fourth refractive index. The optical film according to claim 1, wherein the light guide layer has at least two accommodating recesses, the light incident surface has at least one connection region, and the connection region is located in every two adjacent openings of the recess. Meanwhile, the light absorbing member further covers the connection area. The optical film according to claim 1, wherein the at least one light absorbing member has a maximum thickness T, and the maximum thickness meets the following relationship: Wherein, H is a distance between the top and the bottom of the light guide, n _{4 is} the fourth refractive index, and n _in is a light entering the light guide layer from the light incident surface at an incident angle θ _in. The refractive index of the medium in which the front is located, φ is an angle between all lines on the side and the bottom. A display module comprising: a display panel having a display surface; and the optical film according to any one of claims 1 to 4 disposed on the display surface of the display panel, wherein, The light incident surface faces the display surface. An optical film is used for a display module. The optical film includes: a first light guide layer having a first light incident surface, a first light emitting surface opposite to the first light incident surface, and forming At least one receiving recess on the first light incident surface, wherein the at least one receiving recess has an inner wall surface and a recess opening; a second light guide layer is disposed on the first light incident surface, and the second The light guide layer has a second light entrance surface, a second light exit surface opposite to the second light entrance surface, and at least one light guide member formed on the second light exit surface. The at least one light guide member is respectively disposed on the light guide layer. The at least one receiving recess, and the at least one light guide has a top, a bottom away from the top, and a side connecting the top and the bottom, wherein the side of the at least one light guide faces the at least one The inner wall surface of the receiving recess, the bottom of the at least one light guiding member corresponding to the opening of the recess of the at least one receiving recess; and at least one light absorbing member, the at least one light absorbing member is disposed on the at least one light guiding member Between the side surface and the first light guide layer, and the light absorbing member covers On the side, wherein the first light guide layer has a first refractive index, the second light guide layer has a second refractive index, the first refractive index is greater than the second refractive index, and the at least one light absorbing member has A maximum thickness T, and the maximum thickness conforms to the following relationship: Wherein, H is a distance between the top and the bottom of the at least one light guide, n _{1 is} the first refractive index, n _{2 is} the second refractive index, and θ ₂ is a light beam from the second guide. An incident angle of the optical layer into the first light guide layer, φ is an angle between all lines on the side and the bottom. The optical film according to claim 6, wherein the at least one light absorbing member has a third refractive index, and the third refractive index is equal to the first refractive index. The optical film according to claim 6, wherein the at least one light absorbing member has a third refractive index, and the third refractive index is not greater than the first refractive index and not less than the second refractive index. The optical film according to claim 6, wherein the first light guide layer has at least two accommodating recesses, the first light incident surface has at least one connection area, and the connection area is disposed on every two adjacent areas. Between the recessed openings, wherein the light absorbing member further covers the connection area. A display module comprising: a display panel having a display surface; and the optical film according to any one of claims 6 to 9 provided on the display surface of the display panel, wherein, The second light incident surface faces the display surface.