[0015] Please refer to figure 2 , Which is a cross-sectional view of the direct type backlight module according to the first embodiment of the present invention. In this embodiment, the direct type backlight module 100 has a light guide plate 131, a reflective sheet 132, and a plurality of light sources 133. The light source 133 may be a lamp tube.
[0016] The light guide plate 131 has a light entrance surface 134 and a light exit surface 135, and the light exit surface 135 is located above the light entrance surface 134. The light incident surface 134 has a groove-shaped non-planar structure. The reflective sheet 132 is used to reflect light. A plurality of light sources 133 are arranged between the light guide plate 131 and the reflective sheet 132; and the plurality of grooves 137 on the light guide plate 131 are arranged corresponding to the positions of the light sources 133, and each light source 133 is placed in a groove 137, which can reduce the backlight module 100 overall thickness.
[0017] The light emitted from the light source 133 can enter through the light incident surface 134 with the groove 137 and directly exit the light guide plate 131, or it can be reflected by the reflective sheet 132, enter the light guide plate 131 from the light incident surface 134, and then enter the light guide plate 131 from the light exit surface. 135 emits the light guide plate 131 described above.
[0018] The cross section of the groove 137 of the light guide plate 131 can be as figure 2 As shown in the polygonal shape, and above the light guide plate 131, a diffusing device 136 is also provided to diffuse the light beam more uniformly. The diffusion device 136 may include a protective sheet attached to the light-emitting surface 135, a prism sheet attached to the protective film, and an atomizing sheet attached to the prism sheet.
[0019] Please refer to image 3 , Which is a cross-sectional view of the direct type backlight module according to the second embodiment of the present invention. In this embodiment, the direct type backlight module 200 has a light guide plate 231, a reflective sheet 232, and a plurality of light sources 233, wherein the light source 233 may be a lamp tube.
[0020] The light guide plate 231 has a light entrance surface 234 and a light exit surface 235, and the light exit surface 235 is located above the light entrance surface 234. The light incident surface 234 has a groove-shaped non-planar structure. The reflective sheet 232 is used to reflect the light beam. A plurality of light sources 233 are arranged between the light guide plate 231 and the reflective sheet 232; and the plurality of grooves 237 on the light guide plate 231 are arranged corresponding to the positions of the light sources 233, and each lamp tube 233 is placed in a groove 237, which can reduce the backlight The overall thickness of the module 200.
[0021] The light emitted from the light source 233 can enter through the light incident surface 234 with the groove 237 and directly emit the light guide plate 231, or it can be reflected by the reflective sheet 232, enter the light guide plate 231 from the light incident surface 234, and then exit the light The light guide plate 231 is emitted from the surface 235.
[0022] In this embodiment, the cross section of the groove 237 of the light guide plate 231 may be as image 3 The arc shape shown. Above the light guide plate 231, there is also a diffusion device 236 for spreading the light beams more uniformly. The diffusion device 236 may include a protective sheet attached to the light emitting surface 235, a prism sheet attached to the protective sheet, and An atomizing sheet is attached to the prism sheet.
[0023] Please refer to Figure 4 , Which is a cross-sectional view of the direct type backlight module according to the third embodiment of the present invention. In this embodiment, the direct type backlight module 300 has a light guide plate 331, a reflective sheet 332, and a plurality of light sources 333, where the light sources 333 may be light tubes.
[0024] The light guide plate 331 has a light entrance surface 334 and a light exit surface 335, and the light exit surface 335 is located above the light entrance surface 334. In addition, the light incident surface 334 has a groove-shaped non-planar structure. The reflective sheet 332 is used to reflect the light beam. A plurality of light sources 333 are arranged between the light guide plate 331 and the reflective sheet 332; and the plurality of grooves 337 on the light guide plate 331 are arranged corresponding to the positions of the light sources 333, and each light source 333 is placed in a groove 337 to reduce backlighting The overall thickness of the module 300.
[0025] The light emitted from the light source 333 can enter through the light incident surface 334 with the groove 337 and directly exit the light guide plate 331, or it can be reflected by the reflective sheet 332, enter the light guide plate 331 from the light incident surface 334, and then exit the light guide plate 331. The surface 335 emits the above-mentioned light guide plate 331.
[0026] In this embodiment, the cross section of the groove 337 of the light guide plate 331 may be as Figure 4 The triangle shown. Above the light guide plate 331, there is also a diffusion device 336 for spreading the light beam more uniformly. The diffusion device 336 may include a protective sheet attached to the light emitting surface 335, a prism sheet attached to the protective sheet, and an atomizing sheet attached to the prism sheet.
[0027] Although the present invention has been disclosed in combination with the above preferred embodiments, it is not limited to the present invention. Anyone familiar with the technology can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be The terms defined in the claims shall prevail.
