TW200538812A - Structure and method for compensating the brightness in the dark area of a backlight module - Google Patents

Abstract

The present invention provides a structure and method for compensating the brightness in the dark area of a backlight module. A trench structure is formed in the side frames of the backlight module to provide a extra reflective space for the light guide panel, thus the brightness in the dark areas, i.e. the side areas of the light guide panel could be compensated and the whole light output of the backlight module will become more uniform.

Description

200538812 V. Description of the invention (1)-1. [Technical field to which the invention belongs] The present invention relates to a backlight module used for compensating for 媸, and the structure of the dark area of the lathe θ ^ μ Beglo is particularly relevant. The structure of the side in the backlight module, and a method for improving the backlight module H2 through the groove structure. Nine rounds of uniformity 2. [Previous technology]: Month: The light module is a component used to provide a light source on the back. It can be applied to products such as LCD f0, mobile phone panels, film scanners, and slide projectors. Provides a uniform area light source output. For a conventional backlight module structure using a side-type light source, a three-dimensional schematic diagram of the backlight module structure can be referred to FIG. 1A. The backlight module 1 is mainly composed of a light guide plate 101, a reflection plate i 03, a cold cathode tube 05, a reflector 107, a wafer 10, and an optical film 1 1 1 having other functions. composition. The cold cathode tube 105 is surrounded by a cover-shaped reflecting member 105, so that the generated light can be reflected in the reflecting member 107 and then be introduced into the light guide plate 101 through the opening of the reflecting member 107. Incident surface. The light guide plate 101 is mainly used to guide the direction of light diffusion. From the first picture A, it can be seen that 'this 101 light guide plate is a wedge-shaped light guide plate with a V-cut type, and the bottom surface is composed of a plurality of light guide plates. It is composed of V-shaped grooves arranged in parallel, and a reflecting plate 103 is arranged below, so that after entering the light guide plate 101, light can pass through a plurality of V-shaped grooves arranged in parallel for reflection and refraction. Action, the most k rays are output to the upper diaphragm through the light output surface of the light guide plate 1 0 1

Page 5 200538812___ V. Description of the Invention (2) ~~~ '109. The prism sheet 109 can produce wrong toothed grooves by pasting acrylic resin or direct injection. Referring to the first figure A, we can find that there are multiple parallel grooves on the cymbal 109. The arrangement direction of the grooves and the arrangement direction of the V-shaped grooves on the light guide plate 101 are vertically staggered, so that it can cooperate with the light guide plate 101 to produce a uniform light distribution. Finally, the light passes through the optical module Π1 for other further processing-and then is output to the applied product such as a liquid crystal display. In the backlight module 100, 'the combination of many frames enables components such as the light guide plate 101, the reflection plate 103, the cold cathode tube 105, the reflection member 107, and the cymbal 10 to be placed therein', and The frame itself can also help the backlight module 100 achieve more efficacy with a unique structure or material. In the first picture A, the meaning is based on the direction of the light output of the cold cathode tube 105, which is closely attached to the side frames 1 1 3 on both sides of the light guide plate 1 0 1 and the reflector 1 107 to help guide the light. The light plate 1 01 performs a reflection action on both sides; the front frame 1 17 directly facing the light output surface of the cold cathode tube i 〇5 and the back frame i 丨 5 located behind the reflecting member 107 are used for fixing. The reflector 1 107 and the light guide plate 101. ^ Refer to the first diagram B, which is an upper perspective view of the light guide plate 101, the reflecting member 107, the cold cathode 106, the side frames 113, the front frame 1 丨 7, and the back frame 115. The electrode parts on both sides of the cold cathode tube 105 do not emit light by themselves, and an insulating sleeve 1 丨 9 for protecting the electrode is added, so that the light is prevented from entering the sides of the V light plate 1 01 near the light entrance. The corner approach causes the light guide plate 101 to create a dark area with insufficient brightness on the corner near the light entrance (such as a dotted line)

Page 6 200538812 V. Description of the invention (3) ^ a '-121 circle range), resulting in the application of the backlight module 100 has a shadow area on the visual envelope, affecting the overall backlight module丨 00 output quality; but if the length of the cold cathode tube 05 is lengthened to solve the problem caused by the above-mentioned dark areas, it will increase the size of the entire backlight module 1000 and increase the importance of the same. Production costs for group 100. Therefore, there is no need for a method and structure for compensating the dark area generated by the backlight module in the corner of the light. the cost of. Referring to FIG. 1A, FIG. 1c, and FIG. 1d, the wedge-shaped light guide plate 1 〇1 has a plurality of V-shaped grooves arranged below the cold cathode tube 105. In this way, light can be transmitted to the entire light guide plate 10i, but because of this, the area near the side frame n 3 on both sides of the light guide plate 10 and becomes a dark area with insufficient brightness (such as the first C picture The area enclosed by the dashed line 1 2 3), and the area near the front frame i 丨 7 located in front of the light guide plate 10 (such as the area enclosed by the dashed line 1 2 5 in the first D figure) will also cause insufficient brightness. , Which affects the light output quality of the entire backlight module 100. If additional frame volume is added to the side frame 1 13 and the front frame 1 17 to cover the areas on both sides of the backlight module, although the side and center can be reduced in the light output of the backlight module 100 The brightness of the area is different, but it misses the luminous efficiency of the original 100 side of the backlight module. Therefore, there is an urgent need for a method and structure for compensating the lack of brightness on the two sides and the front side of the backlight module to become dark areas, and to solve the problems caused by the dark areas without wasting the original luminous efficiency of the backlight module 100, so that the backlight module Produces uniform backlight output. 200538812____ — V. Description of the invention (4) 3. [Summary of the invention] In view of the above background of the invention, regarding the problem that the corner areas of the backlight module and the areas on both sides of the backlight module have a lack of brightness, the shadow areas appear visually. The invention provides a side frame structure used in a backlight module. The purpose is to reduce the chance of dark areas in the backlight module without increasing the length of the cold cathode tube in the original backlight module. The architecture can increase the utilization of the light source. In another aspect, the present invention provides a method for increasing the brightness of a corner dark area in a backlight module, so that the backlight module applying the method generates a uniform surface light source output. According to the above object, the present invention provides a structure and method for compensating the brightness of a dark area in a backlight module. A plurality of groove structures are formed on a side frame having reflection characteristics, so that the side frame and the light guide plate are increased. The area of reflection of light, so that the brightness of the so-called dark areas on both sides of the light guide plate and the corner near the light entrance surface can be improved, and the light output of the overall backlight module can be more uniform. In addition, the method for forming a recess in the side frame provided by the present invention is not only easy to achieve in manufacturing, but also can improve the utilization ratio of the original backlight module on the light source without adding additional costs. 4. [Embodiment] The following is a detailed description of the present invention. The backlight module is described in the following description.

Page 8 200538812___ 5. The description of each component in (5) ~ does not include a complete description of its operating principle and assembly process. The prior art used in the present invention is only used as a key = positive use here to help explain the present invention. Moreover, the related diagrams in the following text are not drawn according to the actual scale, and their function is only to express the features of the present invention '. According to a first preferred embodiment of the present invention, a structure for compensating a dark area in a corner of a backlight module is provided. First, referring to the schematic diagram of the three-dimensional structure shown in FIG. 2A, the backlight module 2000 is mainly used by one. The side-type light source is an incident light guide plate 201, a reflecting plate 203, a cold cathode tube 205, a reflecting member 207, a prism sheet 209, and an optical film 2 1 1 having other functions. The cold cathode tube 2 0 5 is surrounded by a cover-shaped reflecting member 2 05 (a plate-shaped reflecting member can also be implemented according to the present invention), so that the generated light can be reflected in the reflecting member 2 7 Then, the light incident surface of the light guide plate 201 (the side of the light guide plate 201 directly facing the cold cathode tube 205) is introduced through the opening of the reflector 207. In this embodiment, the light guide plate 201 is selected to use a light guide plate having a plurality of V-shaped grooves arranged in parallel. The light guide plate is mainly used to guide the direction of light diffusion. The bottom surface of the light guide plate can form a reflecting surface, or as In the implementation, a reflecting plate 203 is arranged below the light, so that after entering the light guide plate 201, the light can pass through a plurality of v-shaped grooves arranged in parallel to perform reflection and refraction. Finally, the light passes through the guide The light output surface of the light plate 2 01 (the side of the light guide plate 201 that faces the cymbal 2 0 9) is output to the upper cymbal 2 0 9. The cymbals 2 09 can be made into jagged grooves by sticking acrylic resin or direct injection. Referring to the second figure A, we can find that there are a plurality of parallel grooves on the cymbals 2 09. The arrangement direction of the grooves and

200538812 V. Description of the invention (6) The arrangement direction of the V-shaped grooves on the light guide plate 201 is staggered vertically. In this way, it can cooperate with the light guide plate 201 to produce a uniform light distribution. Finally, the light is further processed through the optical module 2 1 1 and then output to the applied product, such as a liquid crystal display. In this embodiment, a side frame 213 composed of a non-light-absorbing material on both sides of the light guide plate 201 and the reflective member 2 07 is formed on two inner sides facing the light guide plate 201 and the reflective member 2 07. Structure of rectangular grooves 2 1 3 ,. In this way, the light emitted from the cold cathode tube 2 0 5 can enter the extra reflection space provided by the rectangular groove 2 1 3 by natural light leakage, and enter the light guide plate 201 after reflection. The area of the corner where the light enters, and the brightness of the “dark area” caused by the insulating sleeve 2 1 9 is the obstacle, which makes the backlight module 2 1 3 of this side frame 2 0 〇 in the light output It can improve the overall uniformity. The second picture of the rural photo is' the light guide plate 2 in the backlight module 2000, the reflector 2 07, the cold cathode tube 2 0 5, the insulation sleeve 219, two The upper perspective view of the side frame 21 3, the front frame 21 7 and the back frame 215. From this observation, it can be seen that the rectangular groove 213 formed in the side frame 213 has a horizontal range extending from the reflecting member 207. To the light guide plate 20 1 (and the range in the vertical direction depends on the thickness and position of the light guide plate 201). The groove arrangement direction of the rectangular groove 213, is perpendicular to the light output surface of the light guide plate 201 , And the groove structure formed on the two inner sides of the side frame 213 facing the light guide plate 201 and the reflecting member 207 is also not. Limited to the present embodiment, u-recessed rectangular shape 'other embodiments, for example, a circular arc

Page 10 200538812 V. Description of the invention (7) Grooves, triangular V-grooves The present invention is specifically implemented. Even other polygonal grooves can be based on this embodiment. The backlight module 200 is a cold-cathode tube-shaped light source, but other types of light sources include, for example, a plurality of light-emitting diodes. Perform light mixing), and the organic light emitting diode and the light source% can be implemented according to the present invention, so the present invention is only applicable to the light source of the tube type, as long as it is on the side of the light guide plate 201 Or if there are dark areas on the limit, you can form a groove structure in the side frame near the dark area of the light guide plate 201 to increase the chance of light entering these dark areas, thereby improving the overall light output of the light module 200. degree. * According to the second preferred embodiment of the present invention, a structure for supplementing the dark areas on both sides of the northern light module is provided. Firstly, referring to the structure of the Peltier moon shown in Figure A, the backlight module is not intended. The main structure of the group 3 00 is the same as the backlight module 2000 described in the first preferred embodiment, and is mainly composed of a light guide plate 3 using a j-type light source incidence method and a reflection plate. 3 〇3, a cold cathode tube 305, a reflector 3 〇07, a diaphragm 3 009 and an optical film 3 1 1 with other functions =. However, in this embodiment, a side frame 3 丨 3 composed of a light-absorptive material located on both sides of the light guide plate 300 and the reflective member 3 07 is opposed to the two sides of the light guide plate 310 and the reflective member 3 07. The inner side is formed with a plurality of V-shaped grooves 3 1 3 arranged in parallel, and the plurality of V-shaped grooves 3 1 3 extend from the reflective member 3 0 7 to the light guide plate 3 0 1 in the horizontal direction. The range on the side (and the range in the vertical direction depends on the thickness and position of the light guide plate 301), not 200538812 V. Description of the invention (8) But the light emitted from the cold cathode tube 305 can pass through The natural light leakage way enters the extra reflection space provided by the plurality of V-shaped grooves 3 1 3 ', and after reflection, it can enter the corner area of the light guide plate 301 near the light entrance' on the other hand 'the light guide plate 3 The areas on both sides of 0 1 can also increase the extra reflection space at the same time, and increase the opportunity for light to enter both sides of the light guide plate 3 〇 丨, so that the overall brightness of the backlight module 3 0 0 can be averaged, which enhances the backlight module 3 0 0 output quality. Referring to the third diagram B, it is a light guide plate 3 in the backlight module 3 00, a reflector 3 07, a cold cathode tube 3 05, two side frames 3 1 3, a front frame 3 1 7 and a back frame. Top perspective view of 3-15. From this, it can be observed that, in the side frame 3 丨 3, f $ several V-shaped grooves 3 丨 3 arranged in parallel are arranged in a direction perpendicular to the light output surface of the light plate 3 0 1 The groove structure formed on the two inner sides of the side frame 3 丨 3 facing the light guide plate 3 0 1 and the reflecting member 3 0 7 is not limited to the conventional one; the v-shape in the example, and other examples Circular arc-shaped grooves, rectangular grooves, and even other polygonal grooves can also form a plurality of groove-like structures, and the number of grooves is not limited to this embodiment: The number can be adjusted not only according to actual needs, but also can be implemented according to the present invention.

# ； Τ 5 The third preferred embodiment of the Ming is to provide a complement > Body: ί: Ϊ 暗 • 的 结 • 'First refer to the preferred rendering I # shown in Figure 4A 〇 The main structure is the same as the backlight modules 2000 and 300 of the first, eighth and daggers. "

Page 12 200538812 V. Description of the invention (9) It consists of a light guide plate 4 using side-entered light source incident method 4 〇 丨 a reflection plate 4 0 3, a cold cathode tube 4 0 5, a reflecting member 4 〇7, It is composed of a diaphragm 409 and an optical film 41 with other functions. However, in this embodiment, a side frame 4 1 3 ′ composed of a non-light-absorbing material located on both sides of the light guide plate 401 and the reflective member 4 0 7 faces two sides of the light guide plate 401 and the reflective member 407. A V-shaped groove 4 1 3 ′ is formed on the inner side, and the v-shaped groove 4 1 3 extends from the reflective member 4 0 7 to both sides of the light guide plate 4 0 1, which not only makes the self-cooling cathode tube 4 〇5 light can enter the V-groove 4 1 3 by natural light leakage, the extra reflection space provided, and after reflection, can enter the corner area of the light guide plate 4 〇 丄 near the light entrance At the same time, the areas on both sides of the light guide plate 〇 丨 can also increase additional reflection space, and increase the opportunity for light to enter both sides of the light guide plate 401, so that the overall brightness of the backlight module 400 can be averaged, Improve the output quality of the backlight module 400. Referring to the fourth diagram B, it is a light guide plate 401, a reflecting member 407, a cold cathode tube 405, an insulating sleeve 4 1.9, a side frame 4 1 3, and a front frame within the backlight module 400. Top perspective view of 4 1 7 and back frame 4 1 5. The V-shaped grooves 4 1 3 '' formed in the side frame 4 1 3 '' have a groove arrangement direction that is the biggest difference from the first and second embodiments described above. The groove arrangement direction is the same as the light output of the light guide plate 401. The planes are parallel, meaning that they extend along both sides of the light guide plate 401. This also increases the chance of light entering the two sides of the light guide plate 401, and because the side frame 4 1 3 is only on the light guide plate 40 in the vertical direction The groove structure is formed at the position of 1, so it can be more stable when combined with other layer elements and the light guide plate 401. On the other hand, the inside of the side frame 4 1 3 faces both the inside of the light guide plate 4 0 1 and the reflector 4 0 7

Page 13 200538812 ____ 5. Description of the invention (ίο) ^ ^ ~~ 'The groove structure formed on the surface is not limited to the V-shaped appearance in this embodiment, and other examples include circular υ-shaped grooves and rectangles. Grooves and even other polygonal grooves are said to be implemented in accordance with the present invention; and the number of grooves is not limited to only one groove disclosed in this embodiment, and is composed of a plurality of other parallel grooves. Structures that resemble jagged shapes can also be implemented in accordance with the present invention. In addition, referring to the fourth C diagram, in the backlight module 4 ο 0 'in the front frame 4 1 7 connected to the frame 4 1 3 on both sides, a V-shaped groove structure 4 1 7' can also be formed as needed or The other shape of the groove structure makes the area near the front frame 417 in the light guide plate 401 also increase the chance of light reflection and improve the brightness. According to the twenty-fourth preferred embodiment of the present invention, a structure for compensating the dark area on the inner side of the backlight module is provided. First, referring to the schematic diagram of the three-dimensional structure shown in FIG. The difference between the backlight modules in the foregoing embodiments is mainly a light guide plate 501 using a direct light source incidence method, a plurality of cold cathode tubes arranged in parallel below the light guide plate 501, and a reflection. (Not shown in the figure, but the cold cathode tube 5 0 5 is placed between the reflector and the light incident surface of the light guide plate 5 0 1), a diaphragm 5 0 9 and an optical film 5 1 with other functions Composed of 1. In this embodiment, the side frames 5 1 3 on both sides of the light guide plate 50 1 are also formed with a plurality of V-shaped grooves 5 1 3 arranged in parallel on the two inner sides facing the light guide plate 5 0 1. And in the horizontal direction, it extends from both sides of the light guide plate 501, so that not only the light emitted from the cold cathode tube 505 can enter the plurality of v-shaped grooves 5 1 3 'by natural light leakage. Within the extra reflection space and after reflection and refraction

Page 14 200538812 ____ I. V. Description of the invention (11) The so-called dark areas on both sides of the light guide plate 5 0 1 can be added to the light guide plate 5 〇 丨 to add extra reflection effect space, so that the backlight module 5 〇 The overall output brightness can be averaged, improving the light output quality of the backlight module 500. Referring to the fifth diagram B, which is a light guide plate 5 in the backlight module 500, a cold cathode tube 5 05, an insulating sleeve 5 1 9, side frames 5 1 3, a front frame 5 1 7 and a back frame. Top perspective view of 7 5 1 5. From this, it can be observed that, in the f frame, several F-shaped V-shaped grooves 51 3 formed in the side frame $ 13 are arranged in a direction perpendicular to the light output surface of the V-light plate 51. The groove structure formed on the two inner sides of the side frame 5 1 3 facing the light guide plate 501 is not limited to the V-shape in this embodiment, and other shapes such as a circular u-shaped groove and a rectangle The grooves, even f to 1 other polygonal grooves, can also form a structure with a plurality of jagged grooves, and the number is not limited to the number disclosed in this embodiment.

The objective can be adjusted not only according to actual needs, but also can be implemented according to the present invention. Ten knowledge is TO ^ According to the first to fourth embodiments of the present invention, it can be known that the user of the present invention provides a method for compensating the brightness of the dark area in the backlight module. First, at least one light source is emitted into the backlight module. The light incident surface of the light guide plate. The plate can choose to use the side-entry or direct-down light source incidence method; after that, the line can be guided to the other light from its light output surface through the light guide plate. Lenses, etc .; but because the light guide plate may have insufficient brightness in the side area or corner position (such as near the electrode portion of the light source), the present invention forms a knot in the side frame on the side of the light guide plate.

Page 15 200538812__ V. Description of the invention (12) structure, and the side frame can be made of non-light-absorbing material. In this way, part of the light can enter the additional light mixing area provided by this groove structure, and then The light is reflected back into the light guide plate to increase the brightness of the so-called dark area, thereby improving the uniformity of the light output of the overall backlight module. The structure of this groove can be a V-shaped groove, a circular U-shaped groove, a rectangular groove, or even other polygonal grooves, and the number of formation can be adjusted according to actual needs.

Page 16 200538812 Brief description of the diagram 5. [Simplified illustration of the diagram] The first diagram A is a three-dimensional structure diagram of a conventional backlight module. The first B-picture to the first D-picture are the areas generated by the dark areas in the conventional backlight module. Figure A is a schematic diagram of the three-dimensional structure of the backlight module according to the first preferred embodiment of the present invention. Figure B is a top perspective view of the rectangular recess in the backlight module according to the first preferred embodiment of the present invention. FIG. 3A is a schematic diagram of the three-dimensional structure of the backlight module according to the second preferred embodiment of the present invention.

FIG. 3B is a top perspective view of a plurality of V-shaped grooves in the backlight module according to a second preferred embodiment of the present invention. FIG. 4A is a schematic diagram of the three-dimensional structure of the backlight module according to the third preferred embodiment of the present invention. 4B to 4C are top perspective views of the V-shaped groove in the backlight module according to the third preferred embodiment of the present invention. FIG. 5A is a schematic diagram of the three-dimensional structure of the backlight module according to the fourth preferred embodiment of the present invention.

FIG. 5B is a top perspective view of a plurality of V-shaped grooves in a backlight module according to a fourth preferred embodiment of the present invention. Symbols of components: 100 backlight module 101 light guide plate 103 reflection plate 105 cold cathode tube

Page 17 200538812 Brief description of the diagram 107 Reflector 109 Diaphragm 111 Optical film 113 Side frame 115 Back frame 117 Front frame 119 Insulation sleeve 121 Corner dark area at the entrance of light 123 Dark area on both sides 125 Dark area on the front side 200 Backlight mode Group 201 light guide plate 203 reflector plate 205 cold cathode tube 207 reflector 209 cymbal 211 optical film 213 side frame 213, rectangular groove 215 back frame 217 front frame 219 insulation sleeve 300 backlight module 301 light guide plate 303 reflection plate 305 cold Cathode tube 307 Reflector 309 Cymbal 311 Optical film 313 Side frame 313, V-groove 315 Back frame 317 Front frame 319 Insulation sleeve 400 Backlight module 401 Light guide plate 403 Reflector plate 405 Cold cathode tube 407 Reflector 409 cymbal 411 Optical film 413 Side frame 413, V-groove 415 Back frame 417 Front frame 417, V-groove 419 Insulation sleeve 500 Backlight module

Page 18 200538812

Page 19

Claims (1)

200538812____ 6. Scope of patent application Patent scope 1. A backlight module structure includes: a light guide plate having a light output surface and a light incident surface; a light source disposed on the light incident surface of the light guide plate A reflector, which is arranged beside the light source, so that part of the light generated by the light source can be introduced into the light incident surface through the reflector; and a two-sided frame, which is arranged on the light guide plate The second side, wherein the two side frames have a structure with at least one groove with respect to the reflecting member and two inner sides of the light guide plate. 〇 2. The backlight module structure described in item 1 of the scope of patent application, wherein the two side frames are made of non-light-absorbing material. 3. The backlight module structure according to item 1 of the scope of patent application, wherein the shape of the recess includes rectangular, U-shaped and V-shaped. 4. The backlight module structure described in item 1 of the scope of patent application, wherein the arrangement direction of the recesses is perpendicular to the light output surface of the light guide plate. 〇 5. The backlight module structure according to item 1 of the scope of patent application, wherein the arrangement direction of the recesses is parallel to the light output surface of the light guide plate. 6. The backlight module structure described in item 1 of the scope of patent application, further comprising a Page 20 200538812____ 6. Scope of Patent Application The front frame is connected to the two side frames, and the inner side of the front frame facing the light guide plate has at least one groove. 7. The backlight module structure according to item 6 of the scope of patent application, wherein the two side frames and the front frame are made of a non-light-absorbing material. 8. The backlight module structure according to item 6 of the scope of patent application, wherein the shapes of the grooves formed in the two side frames and the front frame include rectangular, U-shaped and V-shaped. 9. The backlight module structure according to item 6 of the scope of patent application, wherein the arrangement direction of the grooves formed in the two side frames and the front frame is perpendicular to the light output surface of the light guide plate. 10. The backlight module structure according to item 6 of the scope of the patent application, wherein the alignment direction of the grooves formed in the two side frames and the front frame is parallel to the light output surface of the light guide plate. 1 1. The backlight module structure described in item 1 of the scope of patent application is a side-entry backlight module. 1 2. The backlight module structure described in item 1 of the scope of patent application is a direct type backlight module. Page 21 200538812 6. Scope of patent application 13. The backlight module structure according to item 12 of the scope of patent application, wherein the light source is between the reflector and the light incident surface. 14. The backlight module structure according to item 13 of the scope of patent application, wherein the light source is composed of at least one light emitting diode and the backlight module structure can perform a mixed light function. 1 5. The backlight module structure according to item 1 of the scope of patent application, wherein the reflector is a cover structure. 1 6. The backlight module structure according to item 1 of the scope of patent application, wherein the reflector is a plate-shaped structure. 1 7. The backlight module structure according to item 1 of the scope of patent application, wherein the recess forms at least one light reflection effect area. 1 8. A method for compensating the brightness of a dark area in a backlight module, including: providing a backlight module, the backlight module including a light guide plate, a light source, and a reflector, wherein the light guide plate includes a light output surface and A light incident surface, the light source is arranged beside the light incident surface of the light guide plate, and the reflecting member is arranged beside the light source; and two side frames are provided on both sides of the light guide plate, wherein the side frame is opposite to the light guide plate The reflecting member and the inner side of the light guide plate have a groove structure, so that an additional light mixing area is added to the side of the light guide plate, so that the light source generates Page 22 200538812____ 6. Scope of Patent Application Part of the light source can be refracted or reflected again and then be introduced into the light incident surface. 19. The method for compensating the brightness of a dark area in a backlight module according to item 18 of the scope of patent application, wherein the side frame is composed of a non-light-absorbing material. 20. The method for compensating the brightness of a dark area in a backlight module according to item 18 of the scope of patent application, wherein the shape of the groove includes a rectangle, a U-shape, and a V-shape. 2 1. The method for compensating the brightness of a dark area in a backlight module according to item 18 of the scope of patent application, wherein the arrangement direction of the grooves is perpendicular to the light output surface of the light guide plate. 22. The method for compensating the brightness of a dark area in a backlight module according to item 18 of the scope of patent application, wherein the arrangement direction of the grooves is parallel to the light output surface of the light guide plate. 2 3. The method for compensating the brightness of a dark area in a backlight module as described in item 18 of the scope of patent application, wherein the light guide plate adopts a side-entry light source incidence method 0 2 4. As of the scope of patent application No. 2 3 The method for compensating the brightness of a dark area in a backlight module described in the item further includes setting a reflective sheet in the light guide plate on a side opposite to the light output surface. Page 23 200538812 VI. Patent application scope 25. The method for compensating for the brightness of dark areas in a backlight module as described in item 18 of the patent application scope, wherein the light guide plate adopts a direct light source incident method. I ί Page 24