TW201405213A - Backlight module capable of reducing backlight shadow - Google Patents

Abstract

A backlight module includes a substrate, a plurality of light emitting diodes arranged on the substrate, an optical module for evenly distributing light emitted by the plurality of light emitting diodes, and a plurality of support pins arranged on the substrate for supporting the optical module to separate the optical module a predetermined distance from the substrate. Each support pin includes a polygonal pyramid and a fixing pin. The polygonal pyramid has a plurality of triangle faces. A included angle between a normal line of each triangle face and an incident direction of a corresponding light emitting diode is between -10 DEG and 10 DEG. The fixing pin is coupled to the polygonal pyramid for fixing the support pin on the substrate.

Description

Backlight module that reduces backlight shadow

The invention relates to a backlight module, in particular to a backlight module capable of reducing backlight shadow.

Please refer to FIG. 1 and FIG. 2 at the same time. FIG. 1 is a schematic diagram of a conventional backlight module, and FIG. 2 is a schematic diagram of a support pillar structure of the backlight module of FIG. As shown in the figure, the backlight module 100 includes a substrate 110, a plurality of LEDs 120, an optical module 130, and a plurality of support columns 140. A plurality of light emitting diodes 120 are disposed on the substrate 110 for emitting light. The optical module 130 includes an optical module for uniformly diffusing light emitted from the plurality of LEDs 120 to provide a uniform backlight of the backlight module 100. A plurality of support columns 140 are disposed on the substrate 110. Each of the support columns 140 includes a cone 142 for supporting the optical module 130 to space the optical module 130 and the LEDs 120 on the substrate 110 by a predetermined distance. In turn, the optical module 130 can have a sufficient distance to mix the light emitted by the plurality of LEDs 120.

Please refer to Figure 3 and refer to Figure 1 and Figure 2 together. FIG. 3 is a schematic diagram of the backlight pillars of the backlight module 100 of FIG. 1 generating backlight shadows. As shown in FIG. 3, when the light-emitting diode 120 emits light, the support pillar 140 blocks part of the light and creates a shadow in the backlight module 100, thereby causing the backlight module 100 to be located near the support pillar 140. The backlight has uneven brightness and even obvious shadow dark lines. The above-mentioned conventional back The backlight shadow of the optical module 100 affects the picture quality of the display.

The present invention provides a backlight module capable of reducing backlight shadow, comprising a substrate; a plurality of light emitting diodes disposed on the substrate; and an optical module for uniformly diffusing light emitted by the plurality of light emitting diodes And a plurality of support columns disposed on the substrate for supporting the optical module to space the optical module and the substrate by a predetermined distance. Each support column includes a polygonal pyramid and a fixed column. The polygonal pyramid has a plurality of tapered surfaces, and an angle between a normal of each tapered surface and an incident direction of the corresponding light-emitting diode is between plus and minus 10 degrees. The fixing post is coupled to the polygonal cone for fixing the support post on the substrate.

The present invention further provides a backlight module capable of reducing backlight shadow, comprising a substrate; a plurality of light emitting diodes disposed on the substrate; and an optical module for uniformly distributing light emitted by the plurality of light emitting diodes Diffusion; and a plurality of support columns disposed on the substrate for supporting the optical module to space the optical module and the substrate by a predetermined distance. Each support column includes a bottom plate, a first rib, a second rib, and a fixed post. The first end of the first rib is fixed to the first side of the bottom plate. The first end of the second rib is fixed to the second side of the bottom plate relative to the first side, and the second end of the second rib and the first end of the first rib are coupled to the apex of the support column. The fixing post is coupled to the bottom plate for fixing the support post on the substrate.

Compared with the prior art, the support column of the backlight module of the present invention can reflect light to the backlight The position of the shadow or the passage of light to reduce the shadow of the backlight can further improve the picture quality of the display.

Please refer to FIG. 4 and FIG. 5 , FIG. 4 is a schematic diagram of a backlight module of the present invention, and FIG. 5 is a schematic diagram of a first embodiment of a support pillar structure of the backlight module of FIG. 4 . As shown in FIG. 4 , the backlight module 200 includes a substrate 210 , a plurality of LEDs 220 , an optical module 230 , and a plurality of support columns 240 . A plurality of light emitting diodes 230 are disposed on the substrate 210 for emitting light. The optical module 230 includes an optical module for uniformly diffusing light emitted from the plurality of LEDs 220 to provide a uniform backlight for the backlight module 200. A plurality of support columns 240 are disposed on the substrate 210 to space the optical module 230 and the LEDs 220 on the substrate 210 by a predetermined distance, so that the optical module 230 can have a sufficient distance to the plurality of LEDs. The light emitted by the body 220 is mixed. As shown in FIG. 5, each support post 240A includes a polygonal cone 242A (eg, a quadrangular pyramid) and a fixed post 244A. The polygonal pyramid 242A has a plurality of triangular tapered faces 243A. The fixing post 244A is coupled to the polygonal cone 242A for fixing the supporting post 240A on the substrate 210.

Please refer to Figure 6 and refer to Figure 4 and Figure 5 together. Figure 6 is a schematic diagram of the support column configuration of the backlight module. As shown in FIG. 6, in order to reduce the shadow of the backlight, the number of tapered faces 243 of the polygonal pyramid 242 corresponds to the number of the adjacent light-emitting diodes 220, and the normal and corresponding to each tapered surface 243 of the polygonal pyramid 242 The angle α of the incident direction of the light-emitting diode 220 is between plus and minus 10 degrees. For example, when the support column 240 When four light-emitting diodes 220 are disposed in the vicinity, the polygonal pyramid 242 has four tapered surfaces 243, and the angle α between the normal line of each tapered surface 243 and the incident direction of the corresponding light-emitting diode 220 is between Between plus and minus 10 degrees, the light emitted by the LED 220 can be reflected by the tapered surface 243 of the polygonal cone 242 to the position where the backlight is generated, thereby reducing the occurrence of backlight shadows.

Please refer to Figure 7 and refer to Figure 4 and Figure 5 together. Figure 7 is a schematic diagram of another embodiment of a support post configuration of a backlight module. As shown in FIG. 7, when six light-emitting diodes 220 are disposed near the support post 240, the polygonal pyramid 242 has six tapered faces 243, and the normal line of each tapered surface 243 and the corresponding light-emitting diode The angle between the incident directions of the body is between plus and minus 10 degrees, so that the light emitted by the LED 220 can be reflected by the tapered surface 243 of the polygonal cone 242 to the position where the backlight is generated, thereby reducing the shadow of the backlight.

In the above embodiment, the number of tapered faces 243 of the polygonal pyramid 242 is merely an example, and the polygonal pyramid may have an even number of tapered faces, and the number of tapered faces is 8 or less (including 8).

Please refer to FIG. 8. FIG. 8 is a schematic view showing a second embodiment of the support column structure of the backlight module of FIG. 4. As shown in FIG. 8, each support column 240 includes a bottom plate 245, a first rib 246A, a second rib 246B, a third rib 246C, a fourth rib 246D, and a fixing post 244. The first end of the first rib 246A is fixed to the first side of the bottom plate 245. The first end of the second rib 246B is fixed to the bottom plate 245 with respect to the second side of the first side The second end of the second rib 246B and the second end of the first rib 246A are coupled to the apex of the support post 240. The first end of the third rib 246C is fixed to the third side of the bottom plate 245. The first end of the fourth rib 246D is fixed to the fourth side of the bottom plate 245 with respect to the third side, and the second end of the third rib 246C and the second end of the fourth rib 246D are coupled to the apex of the support post 240. The fixing post 244 is coupled to the bottom plate 245 for fixing the support post 240 on the substrate 210.

Please refer to Figure 9 and refer to Figure 4 and Figure 5 together. Figure 9 is a schematic view of another embodiment of a support post configuration of a backlight module. As shown in FIG. 9, in order to reduce the shadow of the backlight, the gap between the adjacent two ribs of the first to fourth ribs 246A, 246B, 246C, 246D faces the incident direction of the corresponding light-emitting diode 220, so that the light-emitting two The light emitted by the polar body 220 can pass, thereby reducing the occurrence of backlight shadows.

In the above embodiment, the number of ribs of the support post 240 is only used as an example. The support post 240 may include other numbers of ribs according to the configuration of the light-emitting diode 220, and the number of ribs is at least two or more (including two). ).

In addition, the support post 240 of the present invention may be made of a white or transparent material, and the light transmittance of the support post 240 is between 20% and 99%. This can further reduce the generation of backlight shadows.

Compared with the prior art, the support column 240 of the backlight module 200 of the present invention can reflect light to the position of the backlight shadow or allow light to pass through to reduce the shadow of the backlight. This can further improve the picture quality of the display.

The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

100,200‧‧‧Backlight module

110,210‧‧‧Substrate

120,220‧‧‧Lighting diode

130,230‧‧‧Optical module

140,240‧‧‧Support column

142‧‧‧ cone

242‧‧‧Multi-angle cone

243‧‧‧ Cone

244‧‧‧ fixed column

245‧‧‧floor

246A, 246B, 246C, 246D‧‧‧ rib

‧‧‧‧ angle

FIG. 1 is a schematic view of a conventional backlight module.

Fig. 2 is a schematic view showing the structure of the support column of the backlight module of Fig. 1.

Fig. 3 is a schematic view showing the backing shadow of the support column of the backlight module of Fig. 1.

4 is a schematic view of a backlight module of the present invention.

Fig. 5 is a schematic view showing a first embodiment of a support column structure of a backlight module.

Figure 6 is a schematic diagram of the support column configuration of the backlight module.

Figure 7 is a schematic diagram of another embodiment of a support post configuration of a backlight module.

Figure 8 is a schematic view showing a second embodiment of the support column structure of the backlight module of Figure 4.

Figure 9 is a schematic view of another embodiment of a support post configuration of a backlight module.

220‧‧‧Lighting diode

240‧‧‧Support column

242‧‧‧Multi-angle cone

243‧‧‧ Cone

‧‧‧‧ angle

Claims (10)

A backlight module capable of reducing backlight shadows, comprising: a substrate; a plurality of light emitting diodes disposed on the substrate; and an optical module for uniformly diffusing light emitted by the plurality of light emitting diodes; and a plurality of support columns disposed on the substrate for supporting the optical module to space the optical module and the substrate by a predetermined distance, each support column comprising: a polygonal pyramid having a plurality of tapered surfaces The angle between the normal of each tapered surface and the incident direction of the corresponding light-emitting diode is between plus and minus 10 degrees; and a fixed post coupled to the polygonal pyramid for fixing the support post to the substrate on. The backlight module of claim 1, wherein the polygonal pyramid has an even number of tapered faces. The backlight module of claim 2, wherein the polygonal pyramid has a taper surface of 8 or less. The backlight module of claim 1, wherein the plurality of support columns are made of white or transparent material. The backlight module of claim 1, wherein the plurality of support columns have a light transmittance of between 20% and 99%. A backlight module capable of reducing backlight shadows, comprising: a substrate; a plurality of light emitting diodes disposed on the substrate; and an optical module for uniformly diffusing light emitted by the plurality of light emitting diodes; and a plurality of support columns disposed on the substrate for supporting the optical module to space the optical module and the substrate by a predetermined distance, each support column comprising: a bottom plate; a first rib, the first The first end of the rib is fixed to the first side of the bottom plate; the second end of the second rib is fixed to the second side of the bottom plate relative to the first side, the second rib and the second rib The second end of the first rib is coupled to the apex of the support column; and a fixing post is coupled to the bottom plate for fixing the support post on the substrate. The backlight module of claim 6, wherein the support column further comprises: a third rib, the first end of the third rib is fixed to the third side of the bottom plate; a fourth rib, the fourth rib The first end is fixed to the fourth side of the bottom plate relative to the third side, and the third end of the third rib and the fourth rib are coupled to the apex of the support column. The backlight module of claim 7, wherein a gap between the adjacent ribs of the first rib to the fourth rib faces an incident direction of the corresponding light emitting diode. The backlight module of claim 6, wherein the plurality of support columns are made of white or transparent material. The backlight module of claim 6, wherein the plurality of support columns have a light transmittance of between 20% and 99%.