Light guide plate, backlight module and display device

Abstract

The invention relates to a light guide plate, a backlight module and a display device. The light guide plate comprises a main body and a plurality of prism parts. The main body has a first extension direction and a second extension direction which are perpendicular to each other. The main body comprises a light incident surface and an optical surface. The light incident surface extends along a first extension direction. The optical surface is connected with the light incident surface and has a first side close to the light incident surface and a second side away from the light incident surface. The second extending direction is parallel to the extending direction of the first side towards the second side. The optical surface has a first region, a second region, and a third region arranged in this order along the second extension direction. The plurality of prism parts are arranged on the optical surface, and each prism part extends along a second extension direction. The area ratio of the part, located in the first area, of the prism part is larger than the area ratio of the part, located in the second area, of the prism part and smaller than the area ratio of the part, located in the third area, of the prism part.

Description

[0001] This application is a divisional application of the invention patent application with the application number 201780014960.5, the application date of October 26, 2017, and the title of "Light Guide Plate, Backlight Module and Display Device". Technical Field

[0002] The present invention relates to a light guide assembly and its applications, and particularly to a light guide plate and the applications of the light guide plate in a backlight module and a display device. Background Art

[0003] The light guide plate has a light incident surface, a light exit surface, and a reflection surface. The light provided by the light source enters the light guide plate from the light incident surface of the light guide plate and exits from the light exit surface of the light guide plate. In order to make the light source passing through the interior of the light guide plate mix more evenly, microstructures are usually provided on the light exit surface or the reflection surface of the light guide plate. However, general microstructures have a linear distribution trend that is sparser on the light incident side and gradually denser towards the anti-light incident side. This linear distribution trend is likely to generate bright and dark stripes on the light incident side, thereby affecting the optical appearance of the light guide plate. Therefore, there is an urgent need for a light guide plate to solve the above problems. Summary of the Invention

[0004] Therefore, an object of the present invention is to provide a light guide plate, a backlight module, and a display device. Among them, the light guide plate has a prism design, which can respectively control the light output of each part of the light guide plate, thereby enabling the backlight module and the display device to have a higher uniformity and appearance quality.

[0005] According to the above object of the present invention, a light guide plate is proposed. The light guide plate includes a main body and a plurality of prism parts. The main body has a first extension direction and a second extension direction that are perpendicular to each other. The main body includes a light incident surface and an optical surface. The light incident surface extends along the first extension direction. The optical surface is connected to the light incident surface. Among them, the optical surface has a first side close to the light incident surface and a second side far from the light incident surface. The second extension direction is parallel to the extension direction of the first side towards the second side. Moreover, the optical surface has a first region, a second region, and a third region arranged in sequence along the second extension direction. The prism parts are provided on the optical surface, and each prism part extends along the second extension direction. Among them, the area ratio of the part of the prism part located in the first region is greater than the area ratio of the part of the prism part located in the second region, and less than the area ratio of the part of the prism part located in the third region.

[0006] According to an embodiment of the present invention, each prism part has a first width located in the first region, a second width located in the second region, and a third width located in the third region. Moreover, the first width is greater than the second width, and the first width is less than the third width.

[0007] According to an embodiment of the present invention, each prism part is formed by arranging a plurality of prism structures along a second extending direction. Among them, each prism structure located in a first region has a first width, each prism structure located in a second region has a second width, and each prism structure located in a third region has a third width. Wherein, the first width is greater than the second width, and the first width is less than the third width.

[0008] According to an embodiment of the present invention, each prism part is formed by arranging a plurality of prism structures along a second extending direction. Among them, the arrangement density of the prism structures located in the first region is greater than that of the prism structures located in the second region, but less than that of the prism structures located in the third region.

[0009] According to an embodiment of the present invention, each prism part is formed by arranging a plurality of prism structures along a second extending direction. Among them, there is a first spacing between any two adjacent prism structures along the second extending direction in the first region, there is a second spacing between any two adjacent prism structures along the second extending direction in the second region, and there is a third spacing between any two adjacent prism structures along the second extending direction in the third region. The second spacing is greater than the first spacing, and the first spacing is greater than the third spacing.

[0010] According to an embodiment of the present invention, each prism part is formed by arranging a plurality of prism structures along a second extending direction, and each prism structure is connected to each other.

[0011] According to an embodiment of the present invention, the light guide plate further includes a plurality of light mixing structures. The light mixing structures are arranged on the optical surface, and the light mixing structures are located between the first side and the first region.

[0012] According to an embodiment of the present invention, each prism part is formed by arranging a plurality of prism structures along a second extending direction. Each prism structure includes a first optical surface and a second optical surface. The first optical surface is inclined relative to the light incident surface, and the first optical surface forms a first inclination angle extending from the bottom to the top. The second optical surface is inclined relative to the light incident surface, and the second optical surface forms a second inclination angle extending from the bottom to the top. Wherein, the first inclination angle is less than the second inclination angle, and the first optical surface is close to the light incident surface, and the second optical surface is far from the light incident surface.

[0013] According to an embodiment of the present invention, the mutual connection of the first optical surface and the second optical surface of each prism structure forms a ridge line, and the ridge line is substantially parallel to the first side.

[0014] For the above object of the present invention, a backlight module is further proposed. The backlight module includes the aforementioned light guide plate and a light source. The light source is adjacent to the light incident surface of the light guide plate.

[0015] According to the above object of the present invention, a display device is further provided. The display device includes the aforementioned backlight module and a display panel. The display panel is disposed in front of the light guide plate.

[0016] As can be seen from the above, the light guide plate of the present invention has a plurality of prism parts, and the area occupied by each prism part is different near the light incident surface of the light guide plate, far from the light incident surface (opposite light incident surface) of the light guide plate, and in the middle of the light guide plate. Therefore, the light output amount at different positions of the light guide plate can be controlled separately, and thus the light output uniformity of the overall light guide plate can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more fully understand the embodiments and their advantages, the following description is now made with reference to the accompanying drawings, in which:

[0018] Figure 1A shows a schematic diagram of a backlight module according to a first embodiment of the present invention;

[0019] Figure 1B shows a change curve graph of the area ratio occupied by the prism part at different positions on the optical surface of the light guide plate according to a first embodiment of the present invention;

[0020] Figure 2A shows a partial schematic diagram of a backlight module according to a first embodiment of the present invention;

[0021] Figure 2B shows along Figure 2A a sectional view taken along the A-A section line;

[0022] Figure 3 shows a partial schematic diagram of a backlight module according to a second embodiment of the present invention;

[0023] Figure 4A shows a partial schematic diagram of a backlight module according to a third embodiment of the present invention;

[0024] Figure 4B shows along Figure 4A a sectional view taken along the B-B section line;

[0025] Figure 5 shows a partial schematic diagram of a backlight module according to a fourth embodiment of the present invention;

[0026] Figure 6 shows a partial schematic diagram of a backlight module according to a fifth embodiment of the present invention; and

[0027] Figure 7 shows a schematic diagram of a display device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] Please refer toFigure 1A , which shows a schematic diagram of a backlight module according to a first embodiment of the present invention. The backlight module 100 of this embodiment mainly includes a light guide plate 200 and a light source 300. The light guide plate 200 includes a main body 210 and a plurality of prism parts 220. These prism parts 220 are arranged on the main body 210. By arranging the prism parts 220, the optical trend of the light guide plate 200 can be adjusted, and the uniformity of the light output appearance of the light guide plate 200 can be improved.

[0029] Please continue to refer to Figure 1A , in the light guide plate 200, the main body 210 can be a light-transmitting plate or other equivalent light-transmitting members. In this embodiment, the main body 210 has a first extension direction D1 and a second extension direction D2, and the first extension direction D1 is perpendicular to the second extension direction D2. In addition, the main body 210 mainly includes a light-incident surface 211 and an optical surface 212. Among them, the light-incident surface 211 extends along the first extension direction D1. The optical surface 212 is connected to the light-incident surface 211. In this embodiment, the optical surface 212 is a light-emitting surface. In other embodiments, the optical surface 212 can also be a reflecting surface. The light source 300 is arranged beside the light-incident surface 211, and the light generated by the light source 300 can enter the light guide plate 200 from the light-incident surface 211.

[0030] In one embodiment, the optical surface 212 has opposite first side 212a and second side 212b, where the first side 212a is closer to the light-incident surface 211, and the second side 212b is farther from the light-incident surface 211. Among them, the second extension direction D2 is parallel to the extension direction of the first side 212a towards the second side 212b. In one embodiment, the optical surface 212 has a first region A1, a second region A2, and a third region A3 arranged in sequence along the second extension direction D2. It should be understood that Figure 1A The dotted square shown only serves to schematically illustrate the first region A1, the second region A2, and the third region A3 referred to in the present invention, and the dotted square itself does not belong to the structure of the light guide plate 200 of the present invention.

[0031] Please continue to refer to Figure 1A , the prism parts 220 are arranged on the optical surface 212. In this embodiment, each prism part 220 extends along the second extension direction D2 and simultaneously spans the first region A1, the second region A2, and the third region A3. Please also refer to Figure 1B , which shows a change curve graph of the area ratio occupied by the prism part at different positions on the optical surface of the light guide plate according to the first embodiment of the present invention. Among them, 0 mm on the vertical axis represents the position where the optical surface 212 is connected to the light-incident surface 211, and the larger the value on the vertical axis, the farther the position is from the light-incident surface 211. As Figure 1A and Figure 1BAs shown, the area ratio of the portion of the prism portion 220 located in the first region A1 is greater than the area ratio of the portion of the prism portion 220 located in the second region A2, and less than the area ratio of the portion of the prism portion 220 located in the third region A3. Thereby, when the light generated by the light source 300 enters the light guide plate 200 from the light incident surface 211, the light output amounts of the light emitted by the portion of the prism portion 220 located in the first region A1, the portion of the prism portion 220 located in the second region A2, and the portion of the prism portion 220 located in the third region A3 are different, so that the light output brightness of the overall optical surface 212 can be made more uniform.

[0032] In one embodiment, each prism portion 220 has a first width W1, a second width W2, and a third width W3. The portion of the prism portion 220 having the first width W1 is located in the first region A1, the portion of the prism portion 220 having the second width W2 is located in the second region A2, and the portion of the prism portion 220 having the third width W3 is located in the third region A3. Among them, the first width W1 is greater than the second width W2, and the first width W1 is less than the third width W3. Thereby, the area ratio of the portion of the prism portion 220 located in the first region A1 can be made greater than the area ratio of the portion of the prism portion 220 located in the second region A2, and less than the area ratio of the portion of the prism portion 220 located in the third region A3. It should be understood that the first width W1, the second width W2, and the third width W3 referred to herein are the maximum widths of the portions of the prism portion 220 located in the first region A1, the second region A2, and the third region A3, respectively.

[0033] Please continue to refer to Figure 1A , in this embodiment, each prism portion 220 is formed by a plurality of prism structures (such as prism structure 221, prism structure 222, and prism structure 223) arranged in sequence along the second extension direction D2. Among them, the prism structure 221 is located in the first region A1, the prism structure 222 is located in the second region A2, and the prism structure 223 is located in the third region A3. Please refer to Figure 2A and Figure 2B , wherein, Figure 2A shows a partial schematic view of a backlight module according to a first embodiment of the present invention, Figure 2B shows along Figure 2AThe cross-sectional view taken along the A-A sectional line. In this embodiment, the prism structure 221, the prism structure 222, and the prism structure 223 are connected to each other along the second extension direction D2. In this embodiment, the prism structure 221, the prism structure 222, and the prism structure 223 are all protruding structures and have the same length L1 and height H1. Moreover, the structures of the prism structure 221, the prism structure 222, and the prism structure 223 are substantially the same, and the only difference is that the first width W1' of the prism structure 221, the second width W2' of the prism structure 222, and the third width W3' of the prism structure 223 are different from each other. Therefore, the sizes of the prism structure 221, the prism structure 222, and the prism structure 223 are different from each other.

[0034] Please continue to refer to Figure 2A and Figure 2B , in this embodiment, the first width W1' is greater than the second width W2', and the first width W1' is less than the third width W3'. Thereby, the area ratio of the portion of the prism structure 221 located in the first region A1 is greater than the area ratio of the portion of the prism structure 222 located in the second region A2, and less than the area ratio of the portion of the prism structure 223 located in the third region A3. Therefore, when the light generated by the light source 300 enters the light guide plate 200 from the light incident surface 211, the light output amount emitted from the prism structure 221 close to the light incident surface 211 can be significantly increased, so as to solve the problem of easy generation of bright and dark stripes on the light incident side in the prior art. Therefore, the light output brightness of the optical surface 212 of the light guide plate 200 can be made more uniform.

[0035] In an exemplary example, the prism structure 222 includes a first optical surface 222a and a second optical surface 222b. Among them, the first optical surface 222a is closer to the light incident surface 211, and the second optical surface 222b is farther from the light incident surface 211. The first optical surface 222a is connected to the optical surface 212 and is inclined relative to the light incident surface 211, thereby forming a first inclination angle α. It should be understood that the first optical surface 222a extends from the bottom to the top, and the first inclination angle α is the angle between the first optical surface 222a and the horizontal plane passing through the bottom of the first optical surface 222a, where this horizontal plane and the optical surface 212 are in the same plane.

[0036] The second optical surface 222b connects the optical surface 212 and the first optical surface 222a. The second optical surface 222b is inclined relative to the light incident surface 211, thereby forming a second inclination angle β. It should be understood that the second optical surface 222b extends from the bottom to the top, and the second inclination angle β is the angle between the second optical surface 222b and the horizontal plane passing through the bottom of the second optical surface 222b, wherein this horizontal plane is the same plane as the optical surface 212. Wherein, the connection between the first optical surface 222a and the second optical surface 222b is a ridge line 222c, and this ridge line 222c is substantially parallel to the first side 212a of the optical surface 212. In some embodiments, as Figure 2B shown, the first inclination angle α is less than the second inclination angle β, and the first inclination angle α faces the light incident surface 211, and the second inclination angle β faces away from the light incident surface 211. In this embodiment, the first optical surface 222a and the second optical surface 222b are mainly used to change the direction of the light emitted from the prism structure 222. It should be understood that the structures of the prism structure 221 and the prism structure 223 are substantially the same as the structure of the prism structure 222, and both include a first optical surface and a second optical surface inclined relative to the light incident surface 211 to achieve the purpose of changing the light directivity, so they will not be elaborated here.

[0037] In other embodiments, the light guide plate may also have other different structural designs. Please refer to Figure 3 , which shows a partial schematic diagram of a backlight module according to a second embodiment of the present invention. In this embodiment, the structure of the light guide plate 400 is substantially the same as that of the light guide plate 200 in the first embodiment, and the difference is that the prism portion 420 of the light guide plate 400 has a different structural design. In this embodiment, each prism portion 420 is formed by a plurality of prism structures (such as prism structure 421, prism structure 422, and prism structure 423) arranged in sequence along the second extension direction D2. Wherein, the prism structure 421 is located in the first region A1, the prism structure 422 is located in the second region A2, and the prism structure 423 is located in the third region A3.

[0038] As Figure 3As shown, in one embodiment, the structural dimensions and shapes of the prism structures 421, 422, and 423 are substantially the same. Moreover, the arrangement density of the prism structure 421 at A1 in the first region is greater than that of the prism structure 422 in the second region A2, but less than that of the prism structure 423 in the third region A3. Thereby, the area ratio of the part of the prism part 420 located in the first region A1 is greater than the area ratio of the part of the prism part 420 located in the second region A2, and less than the area ratio of the part of the prism part 420 located in the third region A3. Therefore, when the light generated by the light source 300 enters the light guide plate 400 from the light incident surface 211, the light output amount emitted from the prism structure 421 close to the light incident surface 211 can be significantly increased, so as to solve the problem of easy generation of bright and dark stripes on the light incident side in the prior art. Therefore, the light output brightness of the optical surface 212 of the light guide plate 400 can be more uniform.

[0039] It should be understood that the structural design of the prism structures 421, 422, and 423 in this embodiment is substantially the same as the structural design of the prism structure 222 as Figure 2A and Figure 2B shown, so it will not be elaborated here. On the other hand, the size design of the prism structures 421, 422, and 423 in this embodiment is the same only for illustrative purposes. In other embodiments, the sizes of the prism structures 421, 422, and 423 can also be designed differently. For example, the width of the prism structure 421 can be greater than the width of the prism structure 422 and less than the width of the prism structure 423, so as to change the area ratios of the parts of the prism part 420 located in the first region A1, the second region A2, and the third region A3 respectively, and further control the light output amounts of the light guide plate 400 from the first region A1, the second region A2, and the third region A3 respectively.

[0040] Please also refer to Figure 4A and Figure 4B , wherein, Figure 4A shows a partial schematic diagram of a backlight module according to the third embodiment of the present invention, Figure 4B shows a cross-sectional view taken along the Figure 4A B-B section line of. In this embodiment, the structure of the light guide plate 500 is substantially the same as that of the light guide plate 200 in the first embodiment, except that the prism part 520 of the light guide plate 500 has a different structural design. In this embodiment, each prism part 520 is formed by arranging a plurality of prism structures (such as prism structures 521, 522, and 523) in sequence along the second extension direction D2. Among them, the prism structure 521 is located in the first region A1, the prism structure 522 is located in the second region A2, and the prism structure 523 is located in the third region A3.

[0041] As Figure 4A and Figure 4B shown, in one embodiment, the structural dimensions and shapes of the prism structures 521, 522, and 523 are substantially the same. Among them, there is a first spacing S1 between any two adjacent prism structures 521 along the second extension direction D2 in the first region A1, a second spacing S2 between any two adjacent prism structures 522 along the second extension direction D2 in the second region A2, and a third spacing S3 between any two adjacent prism structures 523 along the second extension direction D2 in the third region A3. Among them, the second spacing S2 is greater than the first spacing S1, and the first spacing S1 is greater than the third spacing S3. Thereby, the area ratio of the part of the prism portion 520 located in the first region A1 is greater than the area ratio of the part of the prism portion 520 located in the second region A2, and less than the area ratio of the part of the prism portion 520 located in the third region A3. Therefore, when the light generated by the light source 300 enters the light guide plate 500 from the light incident surface 211, the light output amount emitted from the prism structure 521 close to the light incident surface 211 can be significantly improved, so as to solve the problem of easy generation of bright and dark stripes on the light incident side in the prior art, and the light output brightness of the optical surface 212 of the light guide plate 500 can be made more uniform.

[0042] It should be understood that the structural design of the prism structures 521, 522, and 523 of the present embodiment is substantially the same as the structural design of the prism structure 222 as Figure 2A and Figure 2B shown, so it will not be described in detail here. On the other hand, the sizes of the prism structures 521, 522, and 523 of the present embodiment are designed to be the same only for illustrative purposes. In other embodiments, the sizes of the prism structures 521, 522, and 523 can also be designed to be different. For example, the width of the prism structure 521 can be greater than the width of the prism structure 522 and less than the width of the prism structure 523, so as to change the area ratios of the parts of the prism portion 520 located in the first region A1, the second region A2, and the third region A3 respectively. In other embodiments, it is also possible to change the arrangement density of the prism structures 521 in the first region A1, the arrangement density of the prism structures 522 in the second region A2, and the arrangement density of the prism structures 523 in the third region A3, so as to change the area ratios of the parts of the prism portion 520 located in the first region A1, the second region A2, and the third region A3 respectively.

[0043] Please refer to Figure 5, which shows a partial schematic view of a backlight module according to a fourth embodiment of the present invention. In this embodiment, the structure of the light guide plate 600 is substantially the same as that of the light guide plate 200 in the first embodiment, except that the light guide plate 600 further includes a light mixing structure 601. As Figure 5 shown, the light mixing structure 601 is disposed on the optical surface 212 and is located between the light incident surface 211 and the first region A1. In this embodiment, the light mixing structure 601 is a strip structure, and the strip structure can be a convex portion protruding from the optical surface 212 or a recessed portion recessed into the optical surface 212. Moreover, the light mixing structure 601 extends along the second extension direction D2. Thereby, after the light emitted by the light source 300 enters the light guide plate 600, it will first pass through the light mixing structure 601 to form uniform light, thereby improving the problem of uneven appearance caused by obvious bright and dark stripes on the light incident side of the known light guide plate.

[0044] It should be understood that Figure 5 the light mixing structure 601 of the light guide plate 600 in the embodiment of Figure 3 is only used as an illustrative example in combination with the prism portion 220. In other embodiments, the light mixing structure 601 of the light guide plate 600 can also be combined with the prism portion 420 shown in

[0045] or the prism portion 520 shown in FIG. 4 to produce the same effect.

[0045] It should be understood that the foregoing prism structure being a convex structure is only for illustrative purposes. In other embodiments, the prism structure can also be a concave structure. Please refer to Figure 6 , which shows a partial schematic view of a backlight module according to a fifth embodiment of the present invention. In this embodiment, the structure of the light guide plate 700 is substantially the same as that of the light guide plate 200 in the first embodiment, except that the prism structures 721, 722 and 723 of the light guide plate 700 have different structural designs. In this embodiment, the prism structures 721, 722 and 723 are recessed structures. In an illustrative example, the prism structure 722 includes a first optical surface 722a and a second optical surface 722b. Among them, the first optical surface 722a is closer to the light incident surface 211, and the second optical surface 722b is farther from the light incident surface 211. The first optical surface 722a is inclined relative to the light incident surface 211, thereby forming a first inclination angle α' extending from the bottom to the top. The second optical surface 722b is inclined relative to the light incident surface 211, thereby forming a second inclination angle β' extending from the bottom to the top. In some embodiments, the first inclination angle α' is less than the second inclination angle β'. In this embodiment, the first optical surface 722a and the second optical surface 722b can mainly be used to change the direction of the light emitted from the prism structure 722. It should be understood that the structures of the prism structure 721 and the prism structure 723 are substantially the same as the structure of the prism structure 722, both including a first optical surface and a second optical surface inclined relative to the light incident surface 211 to achieve the purpose of changing the light directivity, so details are not described herein again.

[0046] Please refer to Figure 2B and Figure 6 as well. Since Figure 2B the prism structures 221, 222, and 223 of the embodiments shown are convex portions, most of the light rays emitted by the light source 300 enter the light guide plate 200 from the light incident surface 211 and then are directed towards the second optical surface (such as the second optical surface 222b). That is to say, the second optical surfaces of the prism structures 221, 222, and 223 are the directly light-receiving surfaces. Therefore, in order to achieve the purpose of guiding light, in some embodiments, the area of the second optical surface of the prism structures 221, 222, and 223 can be larger than the area of the first optical surface to improve the light extraction efficiency and the uniformity of the appearance of the light guide plate 200. On the other hand, since Figure 6 the prism structures 721, 722, and 723 of the embodiments shown are recessed portions, most of the light rays emitted by the light source 300 enter the light guide plate 700 from the light incident surface 211 and then are directed towards the first optical surface (such as the first optical surface 722a). That is to say, the first optical surfaces of the prism structures 721, 722, and 723 are the directly light-receiving surfaces. Therefore, in the structural design, the area of the first optical surface of the prism structures 721, 722, and 723 can be larger than the area of the second optical surface to improve the light extraction efficiency and the uniformity of the appearance of the light guide plate 700.

[0047] Please refer to Figure 7 , which shows a schematic diagram of a display device according to an embodiment of the present invention. The display device 800 of this embodiment includes a backlight module 100 as shown in Figure 2A and Figure 2B as well as a display panel 810. As shown in Figure 7 , the display panel 810 is disposed in front of the light guide plate 200 of the backlight module 100, and the same purpose as described above can be achieved, so it will not be elaborated here. It should be understood that the embodiments of the present application use the backlight module 100 having the light guide plate 200 as shown in Figure 2A and Figure 2B applied to the display device 800 only for illustrative purposes and are not intended to limit the present invention. The light guide plates of the foregoing other embodiments, such as the light guide plates 400, 500, 600, and 700, can also be applied to the display device to produce the same effect.

[0048] As can be seen from the above embodiments of the present invention, the light guide plate of the present invention has a plurality of prism portions, and the areas occupied by each prism portion near the light incident surface of the light guide plate, away from the light incident surface of the light guide plate (anti-light incident surface), and in the middle of the light guide plate are different. Therefore, the light output amounts at different positions of the light guide plate can be controlled separately, and further the light output uniformity of the overall light guide plate can be improved.

[0049] Although the present invention has been disclosed as above through embodiments, it is not intended to limit the present invention. Any person skilled in the art should be able to make some modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be determined by the scope defined in the appended claims.

[0050]

Symbol Explanation

[0051] 100 Backlight module

[0052] 200 Light guide plate

[0053] 210 Main body

[0054] 211 Light incident surface

[0055] 212 Optical surface

[0056] 212a First side

[0057] 212b Second side

[0058] 220 Prism part

[0059] 221 Prism structure

[0060] 222 Prism structure

[0061] 222a First optical surface

[0062] 222b Second optical surface

[0063] 222c Ridge line

[0064] 223 Prism structure

[0065] 300 Light source

[0066] 400 Light guide plate

[0067] 420 Prism part

[0068] 421 Prism structure

[0069] 422 Prism structure

[0070] 423 Prism structure

[0071] 500 Light guide plate

[0072] 520 Prism part

[0073] 521 Prism structure

[0074] 522 Prism structure

[0075] 523 Prism structure

[0076] 600 Light guide plate

[0077] 601 Mixed light structure

[0078] 700 Light guide plate

[0079] 721 Prism structure

[0080] 722 Prism structure

[0081] 722a First optical surface

[0082] 722b Second optical surface

[0083] 723 Prism structure

[0084] 800 Display device

[0085] 810 Display panel

[0086] A1 First region

[0087] A2 Second region

[0088] A3 Third region

[0089] D1 First extension direction

[0090] D2 Second extension direction

[0091] H1 Height

[0092] L1 Length

[0093] W1 First width

[0094] W1’ First width

[0095] W2 Second width

[0096] W2’ Second width

[0097] W3 Third width

[0098] W3’ Third width

[0099] S1 First spacing

[0100] S2 Second spacing

[0101] S3 Third spacing

[0102] α First inclination angle

[0103] α’ First inclination angle

[0104] β Second inclination angle

[0105] β’ Second inclination angle.

Claims

1. A light guide plate, comprising: A body having a first extending direction and a second extending direction perpendicular to each other, wherein, The main body includes: An incident light surface, which extends along the first extension direction; and An optical surface, which connects the incident light surface. Wherein, the optical surface has a first side close to the incident light surface and a second side far from the incident light surface. Wherein, the second extension direction is parallel to the direction in which the first side extends towards the second side, and the optical surface has a first region, a second region, and a third region arranged in sequence along the second extension direction; and A plurality of prism parts, which are arranged on the optical surface, and each prism part extends along the second extension direction. Wherein, the area ratio of the part of each prism part located in the first region is greater than the area ratio of the part of the prism part located in the second region, and less than the area ratio of the part of the prism part located in the third region; Wherein, each prism part includes: A first optical surface, which is inclined relative to the incident light surface, and the first optical surface forms a first inclination angle extending from the bottom to the top; and A second optical surface, which is inclined relative to the incident light surface, and the second optical surface forms a second inclination angle extending from the bottom to the top. Wherein, the first inclination angle is less than the second inclination angle, and the first optical surface is close to the incident light surface, and the second optical surface is far from the incident light surface.

2. The light guide plate according to claim 1, wherein, Each prism part has a first width located in the first region, a second width located in the second region, and a third width located in the third region, and the first width is greater than the second width, and the first width is less than the third width.

3. The light guide plate according to claim 1, wherein, Each prism part is formed by arranging a plurality of prism structures along the second extension direction. Wherein, each prism structure located in the first region has a first width, each prism structure located in the second region has a second width, and each prism structure located in the third region has a third width. Wherein, the first width is greater than the second width, and the first width is less than the third width.

4. The light guide plate according to claim 1, wherein, Each prism part is formed by arranging a plurality of prism structures along the second extension direction. Wherein, the arrangement density of the prism structures located in the first region is greater than the arrangement density of the prism structures located in the second region, but less than the arrangement density of the prism structures located in the third region.

5. The light guide plate according to claim 1, wherein Each prism part is formed by arranging a plurality of prism structures along the second extension direction. Wherein, there is a first spacing between any two adjacent prism structures located in the first region along the second extension direction, there is a second spacing between any two adjacent prism structures located in the second region along the second extension direction, and there is a third spacing between any two adjacent prism structures located in the third region along the second extension direction. Wherein, the second spacing is greater than the first spacing, and the first spacing is greater than the third spacing.

6. The light guide plate according to claim 1, wherein, Each prism part is formed by arranging a plurality of prism structures along the second extension direction, and each prism structure is connected to each other.

7. The light guide plate according to claim 1 further includes a plurality of light mixing structures, which are disposed on the optical surface, and the light mixing structures are located between the first side and the first region.

8. The light guide plate according to claim 1, wherein, The mutual connection of the first optical surface and the second optical surface of each of the prism structures forms a ridge line, and the ridge line is substantially parallel to the first side.

9. A backlight module, comprising: The light guide plate according to any one of claims 1 to 8; And A light source, which is adjacent to the light incident surface.

10. A display device, comprising: The backlight module according to claim 9; And A display panel, which is disposed in front of the light guide plate.

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