Optical film, backlight module and display device

Abstract

An optical film (100) is divided into a main body (110) and two extension parts (120) arranged along a second direction (D2) by two imaginary lines (L) extending along a first direction (D1) and being parallel to each other. The second direction (D2) is substantially perpendicular to the first direction (D1). The main body (110) is located between the two extension parts (120). Each extension part (120) includes a top support edge (121). A first length W0 of the main body (110) extending along the first direction (D1) is greater than a second length W1 of the top support edge (121) extending along the first direction (D1).

Description

Technical Field

[0001] The invention relates to an optical film, a backlight module and a display device, and in particular to an optical film which is advantageous for narrow frame design and a backlight module and a display device comprising the optical film. Background Art

[0002] With the advancement of technology, electronic devices equipped with display devices, such as mobile phones and laptops, have become indispensable items in modern people's lives. In order to meet consumers' demand for appearance and lightness, narrow frame has become a popular trend in the design of display devices.

[0003] However, the backlight module will expand and contract due to temperature. Figure 1 , which is a schematic diagram of the changes of the conventional backlight module 500 when it expands due to heat, wherein the upper half and the lower half are schematic diagrams of the backlight module 500 at room temperature and high temperature respectively. The backlight module 500 includes a frame 510, an optical film 520 and an optical plate 530. Figure 1 As shown, when the optical film 520 expands to a certain extent due to heat, its side edge is squeezed by the frame 510, and the optical film 520 is confined by the frame 510. At this time, the position where the optical film 520 is squeezed by the frame 510 will produce waving or wrinkles, and permanent deformation will occur due to excessive structural stress. Please refer to Figure 2 , which is a schematic diagram of the changes of the conventional backlight module 500 when it contracts when it is cold, wherein the upper half and the lower half are schematic diagrams of the backlight module 500 at room temperature and low temperature respectively. Figure 2 As shown, when the optical film 520 shrinks in cold weather, the area of ​​the optical film 520 pressed by the frame 510 becomes smaller due to the shrinkage, so that the optical film 520 is easily released from the pressing of the frame 510 and jumps out of the frame 510. If the width E of the frame 510 is increased to solve the problem of the optical film 520 jumping out, it is not conducive to the design of a narrow frame. Summary of the invention

[0004] The object of the present invention is to provide an optical film, a backlight module and a display device to solve the above problems.

[0005] According to one embodiment of the present invention, an optical film is provided, which is divided into a main body arranged along a second direction and two extension parts by two imaginary lines extending along a first direction and parallel to each other, wherein the second direction is substantially perpendicular to the first direction, the main body is between the two extension parts, each extension part includes a top supporting edge, and a first length W0 of the main body extending along the first direction is greater than a second length W1 of the top supporting edge extending along the first direction.

[0006] According to another embodiment of the present invention, a backlight module is provided, comprising a frame, an optical plate, a light source and the above-mentioned optical film. The frame comprises two first frame parts opposite to each other. The optical plate is arranged in the frame, and the optical plate comprises a light emitting surface, a bottom surface and a side surface. The bottom surface is opposite to the light emitting surface, and the side surface is connected between the light emitting surface and the bottom surface. The light source is arranged on the bottom surface or the side surface of the optical plate. The optical film is arranged in the frame and is located above the light emitting surface.

[0007] According to another embodiment of the present invention, a display device is provided, comprising the above-mentioned backlight module and a display panel, wherein the display panel is disposed above the backlight module.

[0008] According to another embodiment of the present invention, there is provided a backlight module, comprising a frame, an optical plate, a light source and an optical film. The frame comprises two first frame portions opposite to each other, and each first frame portion extends along a first direction. The optical plate is arranged in the frame, and the optical plate comprises a light emitting surface, a bottom surface and a side surface, the bottom surface is opposite to the light emitting surface, and the side surface is connected between the light emitting surface and the bottom surface. The light source is arranged on the bottom surface or the side surface of the optical plate. The optical film is arranged in the frame and is located above the light emitting surface, and the optical film has two top supporting edges extending along the first direction and parallel to each other. There is an expansion space above the optical film, and the expansion space has a height along the vertical direction. At the expansion temperature, each top supporting edge abuts against each first frame portion, and the height of the expansion space is configured so that the optical film is arched in an arc shape along the vertical direction.

[0009] According to another embodiment of the present invention, a display device is provided, comprising the above-mentioned backlight module and a display panel, wherein the display panel is arranged above the backlight module. The expansion space is located between the display panel and the optical film, and the height of the expansion space is the distance between the display panel and the optical film in the vertical direction.

[0010] Compared with the prior art, the present invention provides an extension portion on the optical film, and the extension length of the top support edge of the extension portion along the first direction is shorter than the extension length of the main body along the first direction, so that the optical film can be prevented from interfering with the frame at the corners or jumping out of the frame when shrinking, and at the same time, it is not necessary to increase the width of the frame, which is conducive to the narrow frame design. On the other hand, by configuring the expansion space, the optical film can be arched in an arc shape along the vertical direction, thereby preventing the optical film from producing permanent deformation such as wave-like deformation or wrinkles due to insufficient expansion space. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the changes of a conventional backlight module when it expands due to heat.

[0012] Figure 2 It is a schematic diagram of the changes of a conventional backlight module when it contracts when it is cooled.

[0013] Figure 3 is a cross-sectional schematic diagram of a display device at a default temperature according to an embodiment of the present invention.

[0014] Figure 4 yes Figure 3 A schematic cross-sectional view of the display device at the expansion temperature.

[0015] Figure 5 yes Figure 3 Schematic diagram of a top view of the frame and optical film.

[0016] Figure 6 yes Figure 5 Schematic diagram of the change of the optical film from the default temperature to the contraction temperature.

[0017] Figure 7 yes Figure 3 Schematic diagram of the optical film in FIG.

[0018] Figure 8 FIG. 4 is a top view schematically showing a frame and an optical film at a default temperature according to another embodiment of the present invention.

[0019] Fig. 9 yes Figure 8 Schematic diagram of the change of the medium optical film from the default temperature to the contraction temperature.

[0020] Fig.10 is a cross-sectional schematic diagram of a display device at a default temperature according to yet another embodiment of the present invention.

[0021] Fig.11 yes Fig.10 A schematic cross-sectional view of the device at the expansion temperature is shown in FIG.

[0022] Fig.12 It is a schematic diagram of the change of a conventional optical film from a default temperature to a contraction temperature. DETAILED DESCRIPTION

[0023] The aforementioned and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of the preferred embodiments with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front, back, etc., only refer to the directions in the accompanying drawings. Therefore, the directional terms used are only for illustration and not for limiting the present invention. The sizes of the components in the accompanying drawings are only for illustration of relative positions or configurations, and are not intended to limit the sizes of the components of the present invention. In addition, in the following embodiments, the same or similar components will use the same or similar reference numerals.

[0024] In the present invention, two elements being parallel or substantially parallel means that there is an angle between the two elements, and the angle is 0 degrees ± 10 degrees, preferably 0 degrees ± 5 degrees, or the angle is 180 degrees ± 10 degrees, preferably 180 degrees ± 5 degrees. In the present invention, two elements being perpendicular or substantially perpendicular means that there is an angle between the two elements, and the angle is 90 degrees ± 10 degrees, preferably 90 degrees ± 5 degrees.

[0025] In the present invention, the backlight module can be used to provide a light source for a liquid crystal display (LCD) panel. Each component in the backlight module includes a bottom surface and a top surface. The bottom surface and the top surface are defined with reference to the LCD panel. The side of each component away from the LCD panel is the bottom surface, and the side facing the LCD panel is the top surface. In the present invention, a component is disposed above another component, which means that it is disposed on the top surface of the other component or above the top surface of the other component.

[0026] In the present invention, the default temperature may be room temperature, such as but not limited to 25° C. The expansion temperature is higher than the default temperature, such as but not limited to the maximum temperature that the backlight module and / or the display device can withstand, or the specified temperature during the specified challenge test, such as but not limited to 95° C. The contraction temperature is lower than the default temperature, such as but not limited to the minimum temperature that the backlight module and / or the display device can withstand, or the specified temperature during the specified challenge test, such as but not limited to -40° C.

[0027] Please refer to Figure 3 , which is a cross-sectional schematic diagram of a display device 1 at a default temperature according to an embodiment of the present invention. The display device 1 comprises a backlight module 10 and a display panel 20, and the display panel 20 is disposed above the backlight module 10. The backlight module 10 is used to provide light to the display panel 20, and the display panel 20 can be an LCD panel.

[0028] The backlight module 10 includes a frame 200, an optical film 100, an optical plate 300 and a light source 400. The optical plate 300 is disposed in the frame 200. The optical plate 300 includes a light emitting surface 310, a bottom surface 320 and a side surface 330. The bottom surface 320 is opposite to the light emitting surface 310, and the side surface 330 is connected between the light emitting surface 310 and the bottom surface 320. The light source 400 is disposed on the bottom surface 320 or the side surface 330 of the optical plate 300, that is, the backlight module 10 can be a direct-type or edge-entry backlight module. Here, the light source 400 is disposed on the side surface 330 and the backlight module 10 is an edge-entry backlight module. The light source 400 can be selectively disposed on a side parallel to the first direction D1 or the second direction D2, and is not limited to this embodiment. The light source 400 may be, but is not limited to, a cold cathode fluorescent lamp (CCFL) or an LED light bar, and an LED light bar is used as an example here, and the LED light bar includes a plurality of LEDs 410. The backlight module 10 may include other optical films or other components according to actual needs.

[0029] The optical film 100 is disposed in the frame 200 and is located above the light emitting surface 310 of the optical plate 300. Figure 7 , which is Figure 3 Schematic diagram of a plan view of the optical film 100. The optical film 100 is divided into a main body 110 and two extensions 120 arranged along the second direction D2 by two imaginary lines L extending along the first direction D1 and parallel to each other. For example, the main body 110 refers to a block corresponding to the display panel 20 that can be used to display images, which is usually a complete rectangle, and the two extensions 120 are blocks extending toward the second direction D2 relative to the rectangular main body 110. The second direction D2 is substantially perpendicular to the first direction D1. The main body 110 is between the two extensions 120, and each extension 120 includes a top support edge 121. In other embodiments, when the backlight module 10 further includes other optical films, the optical film 100 having the top support edge 121 is closer to the display panel 20 than the other optical films.

[0030] Please also refer to Figure 5 , which is Figure 3A schematic top view of the middle frame 200 and the optical film 100. In order to clearly present the optical film 100, the optical film 100 is drawn with solid lines instead of dotted lines. In this embodiment, the light-emitting surface 130 of the optical film 100 is covered by the frame 200, and the frame 200 is a front frame. The frame 200 includes two first frame portions 210 opposite to each other. The two first frame portions 210 of the frame 200 and the two extension portions 120 of the optical film 100 both extend along the first direction D1. In this embodiment, the first frame 210 includes a first horizontal wall 213 and a first vertical wall 214 connected to each other. The first vertical wall 214 is parallel to the vertical direction Z. The first horizontal wall 213 extends inward from the top of the first vertical wall 214 along a direction parallel to the second direction D2. In more detail, the light-emitting surface 130 of the optical film 100 is covered by the first horizontal wall 213. With the help of the first horizontal wall 213 and the extension portion 120 of the optical film, the optical film 100 or other optical films will not fall out of the frame 200. The surface of the first vertical wall 214 of the first frame 210 facing the optical film 100 is the first surface 212, and the first horizontal wall 213 of the first frame 210 opposite to the end connected to the first vertical wall 214 is the first end surface 211.

[0031] At the default temperature, there is a first predetermined gap G1 between each top support edge 121 and the first frame portion 210. In one embodiment, the first predetermined gap G1 refers to the gap between the first surface 212 of the first frame portion 210 and the top support edge 121 of the optical film 100 at the default temperature. An expansion space S is provided above the optical film 100, and the expansion space S has a height H along the vertical direction Z. In one embodiment, the expansion space S refers to the space between the first horizontal wall 213 of the first frame portion 210 and the optical film 100 at the default temperature.

[0032] Please also refer to Figure 4 , which is Figure 3The cross-sectional view of the display device 1 at the expansion temperature is shown in FIG. At the expansion temperature, the optical film 100 expands, and each supporting edge 121 abuts against the first surface 212 of the first frame portion 210. In other words, the first predetermined gap G1 is no longer visible at the expansion temperature, and with the help of each supporting edge 121 abutting against the first surface 212 of the first frame portion 210, the expansion length of the optical film 100 along the second direction D2 has exceeded the first predetermined gap G1, and further with the help of the height H of the expansion space S, the optical film 100 is arched in an arc shape along the vertical direction Z. Specifically, the optical film 100 is arched in a unidirectional arc along the vertical direction Z, thereby reducing the irreversible wave-like deformation or wrinkles of the optical film 100; when the ambient temperature returns to the default temperature, the length of the optical film 100 in the second direction D1 will also return to the length at the predetermined temperature, and each top support edge 121 of the optical film 100 and the first surface 212 of the first frame 210 will form the aforementioned first predetermined gap G1 again. By configuring the expansion space S, when the optical film 100 expands, in addition to stretching along the second direction D2 and reducing the size of the first predetermined gap G1, it can also be arched along the vertical direction Z, which is conducive to the narrow frame design. By configuring a sufficient height H for the expansion space S, the optical film 100 can be prevented from permanent deformation such as wave-like deformation or wrinkles caused by the lack of expansion space in the vertical direction Z, which is conducive to the optical film 100 shrinking to its original size and returning to a flat state when the predetermined temperature is restored.

[0033] In one embodiment, the first length W0 of the main body 110 of the optical film 100 extending along the first direction D1 is greater than the second length W1 of the top support edge 121 extending along the first direction D1, so as to avoid the optical film 100 from interfering with the frame 200 at the corners during expansion and causing permanent deformation such as wrinkles. Figure 7 , the first length W0 of the body 110 and the second length W1 of the top support edge 121 may satisfy the following conditions: In this way, it is ensured that the supporting edge 121 of the optical film 100 has a second length W1 long enough to press against the first upright wall 214 of the first frame portion 210, so as to provide sufficient supporting force to make the optical film 100 unidirectionally arched in the upright direction Z; that is, when the first length W0 of the body 110 is less than 2 / 3 of the second length W1 of the supporting edge 121, it may be insufficient to provide a state where the optical film 100 is unidirectionally arched in the upright direction Z, and permanent deformation such as wave-like deformation or wrinkles may occur.

[0034] exist Figure 3In the embodiment, the main body 110 of the optical film 100 has a first thickness T1, and the extension 120 has a second thickness T2. In one embodiment, the optical film 100 may be of uniform thickness (i.e., T1=T2). However, in other embodiments, the second thickness T2 of the extension 120 may be greater than the first thickness T1 of the main body 110 (i.e., T2>T1), which is conducive to providing the structural strength required for the top support edge 121 to abut against the first frame portion 210. The aforementioned "thickness" is the length of the main body 110 or the extension 120 in the upright direction Z when the optical film 100 does not produce an arc-shaped arch.

[0035] like Figure 7 As shown, the extension portion 120 of the optical film 100 has two corner-cut structures 122 relative to the body 110 along the first direction D1 and / or the second direction D2. In this embodiment, the two corner-cut structures 122 are respectively disposed on both sides of the top supporting edge 121. In more detail, each corner-cut structure 122 includes an inner shrinkage edge 123, which is connected between the edge of the main body 110 extending parallel to the second direction D2 and the top supporting edge 121 of the extension portion 120. The inner shrinkage edge 123 is inclined relative to the top supporting edge 121. At the expansion temperature, the top supporting edge 121 of the optical film 100 presses against the first surface 212 of the first frame portion 210, and the inner shrinkage edge 123 of the optical film 100 (corresponding to the corner of the optical film 100) does not contact the first frame portion 210. As a result, the central portion of the optical film 10 can be arched along the upright direction Z. By using the arrangement of the corner-cut structure 122, it is possible to avoid interference between the corners of the optical film 100 and the frame 200, thereby preventing permanent deformation such as wrinkles from occurring at the edges of the optical film 100 extending parallel to the second direction D2.

[0036] In one embodiment, if Figure 3 and Figure 5 As shown, the frame 200 further includes two second frame portions 220 opposite to each other, and each second frame portion 220 is connected between the two first frame portions 210. The area framed by the first frame portion 210 and the second frame portion 220 of the frame 200 jointly defines a hollow area P, which corresponds to the expansion space S and is surrounded by the two first frame portions 210 and the two second frame portions 220. The second frame portion 220 includes a second horizontal wall 223 and a second upright wall 224, the second upright wall 224 is parallel to the upright direction Z, and the second horizontal wall 223 extends inward from the top of the second upright wall 224 along a direction parallel to the first direction D1. The surface of the second upright wall 224 of the second frame portion 220 facing the optical film 100 is the second surface 222, and the second horizontal wall 223 of the second frame portion 220 relative to the end connected to the second upright wall 224 is the second end surface 221.

[0037] Please refer to Figure 6 , which is Figure 5Schematic diagram of the change of the optical film 100 from the default temperature to the shrinkage temperature, which corresponds to Figure 5 A part of the optical film 100, wherein the thick line A1 represents the state position of the optical film 100 relative to the frame 200 at the shrinking temperature. At the shrinking temperature, there is a second predetermined gap G2 between the top support edge 121 and the first surface 212, and the second predetermined gap G2 is greater than the first predetermined gap G1 at the default temperature, and the top support edge 121 can still correspond to the first end surface 211 and the first surface 212 of the first frame 210, and correspond to the second end surface 221 and the second surface 222 of the second frame 220. In more detail, at the shrinking temperature, a part a1 of the inner shrink edge 123 is located between the first surface 212 and the first end surface 211 of the first frame 210, another part a2 is located in the hollow area P, and another part a3 is located between the second surface 222 and the second end surface 221 of the second frame 220. Thereby, the inner shrink edge 123 is pressed by the first frame 210 and the second frame 220 at the same time, which can enhance the effect of preventing the optical film 100 from jumping off or climbing the frame.

[0038] With the help of the extension part 120, the left and right sides of the optical film 100 can still be pressed by the first frame part 210 when the optical film 100 is at the shrinking temperature, which is conducive to the optical film 100 not easily jumping off or climbing the frame when the temperature rises. Fig.12 , which is a schematic diagram of the change of the conventional optical film 100' from the default temperature to the contraction temperature, and its viewing angle and Figure 6 Similarly, the thick line C1 represents the optical film 100' at the shrinking temperature. When the temperature drops, the optical film 100' shrinks when it is cold. Due to manufacturing tolerances, the right side (not labeled) of the optical film 100' may move from the first end surface 211 and the first surface 212 of the first frame 210 to the hollow area P, which is prone to jump out or climb the frame when the temperature rises.

[0039] In one embodiment, if Figure 5 As shown, at the default temperature, there is a first predetermined gap G1 between the top support edge 121 and the first frame portion 210. At this time, the body 110 of the optical film 100 can completely correspond to the hollow area P, that is, the area of ​​the body 110 is larger than the area of ​​the hollow area P, and the hollow area P is located within the range covered by the body 110. In this way, the body 110 can be completely covered by the frame 200, ensuring the luminous effect of the backlight module 10 of the present invention applied to the display device 1. In one embodiment, "a portion of the inner shrinkage edge 123 is located between the first end surface 211 and the first surface 212 of the first frame portion 210" means that at the default temperature or the shrinkage temperature, at least a portion of the inner shrinkage edge 123 is located within the range covered by the first frame portion 210, that is, the inner shrinkage edge 123 can be partially or completely covered by the first frame portion 210, so that it can be ensured that the optical film 100 will not jump out or climb the frame after experiencing the shrinkage temperature.

[0040] exist Figure 5 , Figure 6 , Figure 7 In the embodiment, the main body 110 of the optical film 100 may further include two side edges 111 opposite to each other, each side edge 111 is located between two imaginary lines L, and each side edge 111 extends along the second direction D2. At the default temperature and the shrinking temperature, the side edges 111 are completely covered by the frame 200, thereby preventing the optical film 100 from jumping off or climbing the frame at the two side edges 111.

[0041] It should be noted that in this embodiment, the two side edges 111 of the optical film 100 are long sides, and the optical film 100 is provided with extensions 120 on the left and right sides of the two side edges 111. In this way, the optical film 100 can press against the frame 200 along the direction of the long side that expands and contracts more due to temperature, so as to avoid the occurrence of permanent deformation problems, and at the same time, the purpose of the mechanism design of the narrow frame can be achieved. In other embodiments, the optical film 100 can be provided with extensions 120 on both the left and right sides and the upper and lower sides at the same time, so as to ensure that the optical film 100 can form an arc in both the first direction D1 and the second direction D2, and reduce the length of the first horizontal wall 213 of the first frame 210 along the second direction D2, and the length of the second horizontal wall 223 of the second frame 220 along the first direction D1, so as to achieve the purpose of the mechanism design of the narrow frame.

[0042] exist Figure 3 In the embodiment, the first horizontal wall 213 is located above the optical film 100, the first vertical wall 214 is bent relative to the first horizontal wall 213, and extends from the first horizontal wall 213 along the vertical direction Z toward the optical plate 300, wherein the first horizontal wall 213 is used to carry the display panel 20, and the hollow area P corresponds to the visible area of ​​the display panel 20. The expansion space S is located between the display panel 20 and the optical film 100, and the height H of the expansion space S is the distance between the display panel 20 and the optical film 100 in the vertical direction Z. Preferably, the maximum height of the optical film 100 in the vertical direction Z is substantially equal to the aforementioned distance. As a result, the size of the display device 1 in the vertical direction Z can be reduced, which is conducive to the thinning of the display device 1. In other embodiments, the height H of the expansion space S can also be configured as the distance between the first horizontal wall 213 and the optical film 100 (or the second horizontal wall 223 and the optical film 100) in the vertical direction Z, so that the optical film 100 will not contact the display panel 20 located above the first horizontal wall 213 and the second horizontal wall 223 when it expands due to heat, thereby achieving the effect of avoiding contact with the display panel 20 and reducing friction.

[0043] Please refer to Figure 8, which is a top view schematic diagram of a frame 200 and an optical film 100a at a default temperature according to another embodiment of the present invention. The difference between the optical film 100a and the optical film 100 is that the corner structure 122a of the extension portion 120a is a right angle, and at least a portion of the inner shrinkage edge 123a is perpendicular to the top support edge 121a and the side edge 111. Please refer to Fig. 9 , which is Figure 8 Schematic diagram of the change of the optical film 100a from the default temperature to the shrinkage temperature, which corresponds to Figure 8 The B portion of the inner shrinkage edge 123a is shown in FIG. 1 , wherein the thick line B1 represents the optical film 100a at the shrinkage temperature. At the shrinkage temperature, a portion b1 of each inner shrinkage edge 123a is located between the first surface 212 and the first end surface 211 of the first frame portion 210, another portion b2 is located in the hollow area P, and another portion b3 is located between the first surface 212 and the first end surface 211 of the second frame portion 220. With the help of a portion b1 of the inner shrinkage edge 123a being covered by the first frame portion 210 and another portion b3 being covered by the second frame portion 220, the optical film 100a can be prevented from jumping off or climbing the frame when the temperature returns to the default temperature. For other details about the optical film 100a, please refer to the relevant description of the optical film 100.

[0044] Please refer to Fig.10 and Fig.11 , Fig.10 is a cross-sectional schematic diagram of a display device 1 a at a default temperature according to yet another embodiment of the present invention. Fig.11 yes Fig.10 The cross-sectional schematic diagram of the display device 1a at the expansion temperature. The difference between the display device 1a and the display device 1 is that the frame 200a of the backlight module 10a is a back plate, and the first frame portion 210a is a vertical wall of the back plate. In this embodiment, the height H of the expansion space S is the distance between the display panel 20 and the optical film 100 in the vertical direction Z. For other details about the display device 1a, refer to the relevant description of the display device 1.

[0045] Compared with the prior art, the present invention provides an extension portion on the optical film, and the extension length of the top support edge of the extension portion along the first direction is shorter than the extension length of the main body along the first direction, so that the optical film can be prevented from interfering with the frame at the corners or jumping out of the frame when shrinking, and at the same time, it is not necessary to increase the width of the frame, which is conducive to the narrow frame design. On the other hand, by configuring the expansion space, the optical film can be arched in an arc shape along the vertical direction, thereby preventing the optical film from producing permanent deformation such as wave-like deformation or wrinkles due to insufficient expansion space.

[0046] The above description is only a preferred embodiment of the present disclosure. All equivalent changes and modifications made according to the scope of the patent application of the present disclosure should fall within the scope of the present disclosure.

[0047] [List of Reference Numerals]

[0048] 1.1a: Display device

[0049] 10, 10a, 500: Backlight module

[0050] 20: Display Panel

[0051] 100, 100a, 100', 520: Optical film

[0052] 110: Ontology

[0053] 111: Side

[0054] 120, 120a: extension

[0055] 121, 121a: Top support edge

[0056] 122, 122a: missing corner structure

[0057] 123, 123a: Indented edge

[0058] 130: Light emitting surface

[0059] 200, 200a, 510: Frame

[0060] 210, 210a: first frame portion

[0061] 211: First end face

[0062] 212: First surface

[0063] 213: First horizontal wall

[0064] 214: First Vertical Wall

[0065] 220: Second frame

[0066] 221: Second end face

[0067] 222: Second Surface

[0068] 223: Second horizontal wall

[0069] 224: Second vertical wall

[0070] 300, 530: Optical board

[0071] 310: Light emitting surface

[0072] 320: Bottom

[0073] 330: Side

[0074] 400: Light source

[0075] 410: LED

[0076] A, B, a1, a2, a3, b1, b2, b3: Part

[0077] A1, B1, C1: thick line

[0078] D1: First direction

[0079] D2: Second direction

[0080] E: Width

[0081] H: Height

[0082] G1: First predetermined gap

[0083] G2: Second predetermined gap

[0084] L: Imaginary line

[0085] P: Hollow area

[0086] S: Expansion Space

[0087] T1: First thickness

[0088] T2: Second thickness

[0089] W0: first length

[0090] W1: Second length

[0091] Z: upright direction.

Claims

1. A backlight module, comprising: a frame member, comprising two first frame portions facing each other; An optical plate is disposed in the frame, and the optical plate comprises: Bright surface; a bottom surface, which is opposite to the light emitting surface; as well as A side surface connected between the light emitting surface and the bottom surface; a light source, which is disposed on the bottom surface or the side surface of the optical plate; as well as An optical film is disposed in the frame and located above the light emitting surface, the optical film is divided into a main body and two extensions arranged along a second direction by two imaginary lines extending along a first direction and parallel to each other, wherein the second direction is substantially perpendicular to the first direction, the main body is between the two extensions, each of the extensions includes a top support edge, a first length W0 of the main body extending along the first direction is greater than a second length W1 of the top support edge extending along the first direction, wherein, Each of the extension portions of the optical film comprises two corner-cut structures, which are respectively arranged on both sides of the top supporting edge, and each of the corner-cut structures comprises an inner shrinking edge, and the inner shrinking edge is connected between the body and the top supporting edge. The optical film can be changed between a default temperature and an expansion temperature, wherein When the optical film is at the default temperature, the main body and the two extensions of the optical film are in a flat state relative to the light emitting surface of the optical plate, and an expansion space is provided above the optical film, and the expansion space has a height along the vertical direction; When the optical film is at the expansion temperature, the inner shrinkage edge will not contact the first frame portion, each of the top supporting edges abuts against each of the first frame portions, and the height of the expansion space is configured so that when the optical film expands, the main body of the optical film can be arched in an arc shape along the upright direction toward the side away from the optical plate, and the main body is farther away from the optical plate than the two extension portions.

2. The backlight module according to claim 1, which satisfies the following conditions: 3 . The backlight module according to claim 1 , wherein a thickness of each of the extending portions is greater than a thickness of the main body.

4. The backlight module according to claim 1, wherein: At least a portion of the inner shrinkage edge of the optical film is inclined or perpendicular to the top support edge. Each of the first frame parts includes a first vertical wall and a first horizontal wall connected to each other, the first vertical wall has a first surface facing the optical film, the first horizontal wall extends inward from the top of the first vertical wall, and the first horizontal wall has a first end surface relative to an end connected to the first vertical wall; The frame is used to carry the display panel, and the frame defines a hollow area, and the hollow area corresponds to the visible area of ​​the display panel; and The inner shrinkage edge of each of the notch structures is configured so that when the optical film is shrunk, a portion of the inner shrinkage edge is located in the hollow area, and another portion is located between the first surface and the first end surface of the first frame.

5. The backlight module according to claim 4, wherein: The optical film can be changed between a default temperature and a shrinking temperature: At the default temperature, each of the top supporting edges is located between the first surface and the first end surface of the first frame portion, and a first predetermined gap is formed between the top supporting edge and the first surface; At the shrinking temperature, each of the top supporting edges is located between the first surface and the first end surface of the first frame portion, and a second predetermined gap is provided between the top supporting edge and the first surface, and the second predetermined gap is greater than the first predetermined gap.

6. The backlight module according to claim 4, wherein: The optical film can be changed between a default temperature and a shrinking temperature: At the default temperature, the body corresponds to the hollow area, and a portion of the inner shrinkage edge of each of the notch structures is located between the first surface and the first end surface of the first frame portion; At the shrinking temperature, a portion of the inner shrinkage edge of each of the notch structures is located in the hollow area, and another portion is located between the first surface and the first end surface of the first frame portion.

7. The backlight module according to claim 6, wherein: The frame further comprises two second frame parts opposite to each other, each of the second frame parts is connected between two of the first frame parts, and each of the second frame parts comprises a second surface and a second end surface opposite to each other; At the shrinkage temperature, a portion of the inner shrinkage edge of each of the notch structures is located between the first surface and the first end surface of the first frame portion, another portion is located in the hollow area, and another portion is located between the second surface and the second end surface of the second frame portion.

8. A display device, comprising: The backlight module according to any one of claims 1 to 7; and The display panel is arranged above the backlight module.

9. A display device, comprising: Backlight module, including: A frame member, comprising two first frame portions opposite to each other, and each of the first frame portions extends along a first direction; An optical plate is disposed in the frame, and the optical plate comprises: Bright surface; a bottom surface, which is opposite to the light emitting surface; as well as A side surface connected between the light emitting surface and the bottom surface; a light source, which is disposed on the bottom surface or the side surface of the optical plate; as well as An optical film, which is arranged in the frame and located above the light emitting surface, the optical film is divided into a main body and two extensions arranged along a second direction by two imaginary lines extending along the first direction and parallel to each other, wherein the second direction is substantially perpendicular to the first direction, the main body is between the two extensions, the optical film has two top supporting edges extending along the first direction and parallel to each other, each of the extensions of the optical film includes two missing corner structures, which are respectively arranged on both sides of the top supporting edge, each of the missing corner structures includes an inner shrinkage edge, and the inner shrinkage edge is connected between the main body and the top supporting edge; and A display panel is arranged above the backlight module, the frame is used to carry the display panel, the frame defines a hollow area, and the hollow area corresponds to the visible area of ​​the display panel; Each of the first frame parts includes a first vertical wall and a first horizontal wall connected to each other, the first vertical wall has a first surface facing the optical film, the first horizontal wall extends inward from the top of the first vertical wall, and the first horizontal wall has a first end surface relative to an end connected to the first vertical wall; The optical film can also change between a default temperature, an expansion temperature and a contraction temperature, wherein: When the optical film is at the default temperature, the main body and the two extensions of the optical film are in a flat state relative to the light emitting surface of the optical plate, and there is an expansion space between the display panel and the optical film, and the expansion space has a height along the vertical direction; When the optical film is at the expansion temperature, the inner shrinkage edge does not contact the first frame portion, each of the top supporting edges of the optical film abuts against each of the first frame portions, and the height of the expansion space is configured so that when the optical film expands, the optical film can be arched in an arc shape along the upright direction toward a side away from the optical plate, and the main body is farther away from the optical plate than the two extension portions; When the optical film is at the shrinking temperature, the inner shrinking edge will not contact the first frame portion, and the inner shrinking edge of each of the notch structures is configured so that when the optical film shrinks, a portion of the inner shrinking edge is located in the hollow area, and another portion is located between the first surface and the first end face of the first frame portion.

10. The display device according to claim 9, wherein: The height of the expansion space is the distance between the display panel and the optical film in the vertical direction, and the maximum height of the optical film arched in an arc shape along the vertical direction is substantially equal to the distance.

Images