TW201403185A - Backlight module and liquid crystal display device - Google Patents

Abstract

The present invention provides a backlight module and a liquid crystal display device. The backlight module includes a light source and a light guide plate. The light guide plate includes a light incident surface, a bottom surface adjacent to the light incident surface, and a light emitting surface opposite to the bottom surface. The light source includes a first row light and a second row light. The first row light and the second row light are located at the same side of the light guide plate and adjacent to the light incident surface. The first row light includes a plurality of first dot light sources arranged along a first line, and the second row light includes a plurality of second dot light sources arranged along a second line which is different from the first line. The second dot light sources are located positions corresponding to intervals between the first dot light sources.

Description

Backlight module and liquid crystal display device

The invention relates to a backlight module and a liquid crystal display device.

The liquid crystal display device has been widely used in mobile phones, personal digital assistants, computers and televisions due to its low radiation, small size, short power consumption and low power consumption. Since the liquid crystal panel of the liquid crystal display device does not have the light-emitting property itself, in order to achieve the display effect, it is necessary to provide a backlight module to the liquid crystal panel to provide planar light with sufficient brightness and uniform distribution to the liquid crystal panel, thereby realizing display of the liquid crystal display device. Features.

The backlight module mainly comprises a light guide plate, a light source, a reflective sheet and one or more optical films. The light source is usually a point source or a line source, and a point source such as a light-emitting diode (LED) is increasingly used in a backlight module for providing light due to its energy saving and environmental protection advantages. The light guide plate is used to guide the direction of the light and achieve uniform brightness, thereby providing uniform distribution of planar light to the liquid crystal panel.

In order to be suitable for medium and large size liquid crystal panels, a plurality of point light sources can be arranged in a line-shaped light bar to replace the conventional cold cathode lamp (CCFL). In order to facilitate the heat dissipation of the point light source, there is generally a certain interval between two adjacent point light sources. However, when the light provided by the point light source is incident on the light incident surface of the light guide plate, the interval between the adjacent two point light sources is The brightness of the light source is lower than that of the point light source, which causes the light of the light guide plate to have a distinct bright and dark alternating phenomenon, that is, a hot spot (Hotspot), causing uneven illumination of the entire backlight module.

In view of this, it is necessary to provide a backlight module with uniform light output.

It is also necessary to provide a liquid crystal display device using the backlight module.

A backlight module includes a light guide plate and a light source, and the light guide plate includes a light incident surface, a bottom surface adjacent to the light incident surface, and a light emitting surface opposite to the bottom surface. The light source includes a first row of point light sources and a second row of point light sources, the first row of point sources and the second row of point sources are located on the same side of the light guide plate and corresponding to the light incident surface, the first row of point light sources including a first point light source spaced apart and arranged on the first straight line, the second row point light source comprising a plurality of second point light sources spaced apart and arranged on the second straight line, the second straight line being different from the first straight line Parallel to the first line, wherein the positions of the plurality of second point sources correspond to the spacing between the plurality of first point sources.

A liquid crystal display device includes a liquid crystal display panel and a backlight module that provides planar light for the liquid crystal display panel. The backlight module includes a light guide plate and a light source, and the light guide plate includes a light incident surface, a bottom surface adjacent to the light incident surface, and a light emitting surface opposite to the bottom surface. The light source includes a first row of point light sources and a second row of point light sources, the first row of point sources and the second row of point sources are located on the same side of the light guide plate and corresponding to the light incident surface, the first row of point light sources including a first point light source spaced apart and arranged on the first straight line, the second row point light source comprising a plurality of second point light sources spaced apart and arranged on the second straight line, the second straight line being different from the first straight line Parallel to the first line, wherein the positions of the plurality of second point sources correspond to the spacing between the plurality of first point sources.

Compared with the prior art, in the backlight module, since the positions of the plurality of second point light sources correspond to the interval between the plurality of first point light sources, the plurality of second point light sources can provide light to the guide The light panel corresponds to a space between the plurality of first point light sources, thereby reducing hot spots, and the backlight module emits light uniformly.

Please refer to FIG. 1. FIG. 1 is a perspective view of a first embodiment of a liquid crystal display device 10 of the present invention. The liquid crystal display device 10 includes a liquid crystal display panel 11 and a backlight module 12 that supplies planar light to the liquid crystal display panel 11. The backlight module 12 includes a light guide plate 13 and a light source 14 . The light guide plate 13 includes a light incident surface 131, a bottom surface 132 adjacent to the light incident surface 131, and a light exit surface 133 opposite to the bottom surface 132. The light source 14 is located on the side of the light incident surface 131 and includes a substrate 141 , a plurality of first point light sources 142 , a plurality of second point light sources 143 , and a driving wafer 144 .

The substrate 141 includes a bearing surface 145 for arranging the plurality of first point light sources 142, the plurality of second point light sources 143, and the driving wafer 144. In this embodiment, the bearing surface 145 is parallel to the light exit surface 133. The substrate 141 may be a printed circuit board or a flexible circuit board, and the inside thereof includes a driving circuit (not shown). The driving chip 144 is disposed at one end of the substrate 141, and the driving wafer 144 is electrically connected to the plurality of first point light sources 142 and the plurality of second point light sources 143 through a driving line inside the substrate 141.

The plurality of first point light sources 142 and the plurality of second point light sources 143 are arranged in two rows. Specifically, the plurality of first point light sources 142 are first row point light sources, that is, the plurality of first point light sources 142 are arranged on the first straight line D1. The plurality of second point light sources 143 are second row point light sources, that is, the plurality of second point light sources 143 are arranged on a second line D2 different from the first line but parallel to the first line D1. The plurality of first point light sources 142 are closer to the light incident surface 131 than the plurality of second point light sources 143. When viewed in a direction X perpendicular to the first straight line D1 but parallel to the light exit surface 133 (in the present embodiment, the direction X is also a direction perpendicular to the light incident surface 131), the position of the plurality of second point light sources 143 is There should be a spacing between the plurality of first point sources 142. In this embodiment, the plurality of first point light sources 142 and the plurality of second point light sources 143 are alternately and staggered as viewed in a direction X perpendicular to the first straight line D1 but parallel to the light exit surface 133. Of course, in a modified embodiment, the plurality of first point light sources 142 and the plurality of second point light sources 143 may alternate two or two in a direction X perpendicular to the first straight line D1 but parallel to the light exit surface 133. (Or alternating between three and three, alternating three or three, alternating one or two) and staggered.

In addition, in this embodiment, in the direction in which the first straight line D1 is located, the distance between the adjacent two first point light sources 142 is equal to the length of the second point light source 143, and the adjacent two second points The distance between the light sources 143 is equal to or greater than the length of the first point source 142.

Further, the thickness of the first point light source 142 and the second point source 143 in the direction Z of the light exiting surface is substantially the same as the thickness of the light guide plate 13. The first point light source 142 and the second point light source 143 may be light emitting diodes, preferably white light emitting diodes, and the first point light source 142 and the second point light source 143 each include a light emitting surface 146 and more. The non-light emitting surface 147 is opposite to the light incident surface 131. The non-light emitting surface 147 of the first point light source 142 is provided with a reflective layer for reflecting the light emitted by the second point light source 143.

It can be understood that, in this embodiment, the two adjacent first point light sources 142 have a first spacing space (not labeled), and the adjacent two second point source 143 have a second spacing space (not labeled). The position of each of the first point light sources 142 is directly opposite to the second space, and the light emitted by each of the first point sources 142 is directly directed to the light incident surface 131 to enter the light guide plate 13. The position of each of the second point light sources 143 is opposite to the first space, and the light emitted by each of the second point sources 143 is incident on the light incident surface 131 via the first space to enter the light guide plate 13.

Compared with the prior art, in the backlight module 12, the plurality of first point light sources 142 and the plurality of second point light sources 143 are arranged in two rows and spaced apart, which not only helps the heat dissipation of the light source 14, but also The positions of the plurality of second point light sources 143 correspond to the intervals between the plurality of first point light sources 142, and the plurality of second point light sources 143 can provide light to the light guide plate 13 corresponding to the plurality of first point light sources 142. At the interval between the two, thereby reducing the hot spot, the backlight module 12 emits light uniformly, and the liquid crystal display panel 11 has a better display effect.

Please refer to FIG. 2. FIG. 2 is a perspective view of a second embodiment of a liquid crystal display device 20 of the present invention. The difference between the liquid crystal display device 20 and the liquid crystal display device 10 of the first embodiment is that the light incident surface of the light guide plate 23 is a convex and concave surface, and the uneven surface defines a plurality of spaced apart bumps 234 and more. Connected to the first light incident region 235 between the adjacent two bumps 234, the plurality of first point light sources 242 respectively correspond to the plurality of first light incident regions 235 and the light emitted by each of the first point light sources 242 The corresponding first light incident region 235 enters the light guide plate 23 , and each of the bumps 234 includes a second light incident region 236 corresponding to the second light source 243 and is connected to the first light incident region 235 and the second light incident light. In the connection region 237 between the regions 236, the light emitted by each of the second point light sources 243 enters the light guide plate 23 from the corresponding second light incident region 236. Further, the two adjacent bumps 234 and the first light incident region 235 connected between the two bumps 234 define a recess 238, and each recess 238 receives a first point light source 242. In the embodiment, the bump 234 and the recess 238 are both rectangular when viewed in the direction Z of the vertical light exiting surface, and the first light incident region 235 and the second light incident region 236 are perpendicular to the light emitting surface. a plane of 233, and the first light incident region 235 is parallel to the second light incident region 236.

Compared with the first embodiment, the light incident surface of the light guide plate 23 of the present invention defines the plurality of bumps 234, and the light emitted by the plurality of second point light sources 243 can directly enter the light guide plate 23 via the plurality of bumps 234. The light emitted by the plurality of second point light sources 243 can be more entered into the light guide plate 23, thereby improving the light utilization efficiency of the plurality of second point light sources 243 to some extent. The plurality of first point light sources 242 are located in the recesses 238 between the plurality of bumps 234, and the assembly and bonding of the light source 24 and the light guide plate 23 are also tighter.

Please refer to FIG. 3. FIG. 3 is a perspective view of a third embodiment of a liquid crystal display device 30 of the present invention. The liquid crystal display device 30 differs from the liquid crystal display device 10 of the first embodiment mainly in that the bearing surface 345 of the substrate 341 is parallel to the light incident surface 331 of the light guide plate 33. When viewed in a direction Z perpendicular to the light exit surface 333, the plurality of first point light sources 342 and the plurality of second point light sources 343 are alternately and staggered.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. The above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art will be included in the following claims.

10, 20, 30. . . Liquid crystal display device

11. . . LCD panel

12. . . Backlight module

13,23. . . Light guide

14, 24. . . light source

131,331. . . Glossy surface

132. . . Bottom

133, 233, 333. . . Glossy surface

141, 341. . . Substrate

142, 242, 342. . . First light source

143, 243, 343. . . Second point source

144. . . Driver chip

145, 345. . . Bearing surface

146. . . Luminous surface

147. . . Non-illuminating surface

234. . . Bump

235. . . First light entrance area

236. . . Second light entrance area

237. . . Connection area

238. . . Depression

D1. . . First straight line

D2. . . Second straight line

X, Z. . . direction

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing a first embodiment of a liquid crystal display device of the present invention.

2 is a perspective view showing a second embodiment of the liquid crystal display device of the present invention.

Fig. 3 is a perspective view showing a third embodiment of the liquid crystal display device of the present invention.

10. . . Liquid crystal display device

11. . . LCD panel

12. . . Backlight module

13. . . Light guide

14. . . light source

131. . . Glossy surface

132. . . Bottom

133. . . Glossy surface

141. . . Substrate

142. . . First light source

143. . . Second point source

144. . . Driver chip

145. . . Bearing surface

146. . . Luminous surface

147. . . Non-illuminating surface

D1. . . First straight line

D2. . . Second straight line

X, Z. . . direction

Claims (10)

A backlight module includes a light guide plate and a light source, the light guide plate includes a light incident surface, a bottom surface adjacent to the light incident surface, and a light emitting surface opposite to the bottom surface, wherein the light source includes a first row of point light sources and a first light source a second row of point light sources, the first row of point sources and the second row of point sources are located on the same side of the light guide plate and corresponding to the light incident surface, the first row of point light sources comprising a plurality of spaced and arranged on the first line a first point light source, the second row of point light sources comprising a plurality of second point light sources spaced apart and arranged on the second line, the second line being different from the first line but parallel to the first line, wherein the plurality of The position of the second point source corresponds to the interval between the plurality of first point sources. The backlight module of claim 1, wherein the light source further comprises a substrate, the substrate comprising a bearing surface for arranging the plurality of first point light sources and the plurality of second point light sources, the bearing surface Parallel to the light exit surface of the light guide plate. The backlight module of claim 2, wherein the plurality of first point light sources and the plurality of second point light sources are alternately and staggered when viewed in a direction perpendicular to the light exiting surface. The backlight module of claim 3, wherein the plurality of first point light sources and the plurality of second point light sources are alternately and staggered. The backlight module of claim 4, wherein, in a direction in which the first straight line is located, a distance between two adjacent first point light sources is equal to a length of the second point light source, and two adjacent The distance between the second point sources is equal to the length of the first point source. The backlight module of claim 4, wherein the light incident surface is a convex and concave surface, the uneven surface defines a plurality of spaced apart bumps and a plurality of adjacent two convex portions. a first light incident region between the blocks, the plurality of first point light sources respectively corresponding to the plurality of first light incident regions and the light emitted by the first point light source enters the light guide plate from the corresponding first light incident region, each The bumps include a second light incident region corresponding to the second point light source and a connection region connected between the first light incident region and the second light incident region, and the light emitted by the plurality of second point light sources is from the The second light incident region enters the light guide plate. The backlight module of claim 6, wherein the adjacent two bumps and the first light incident region connected between the two bumps define a recess, and each recess is at least partially received. A first point source. The backlight module of claim 6, wherein the first light incident region and the second light incident region are both planar, and the first light incident region is parallel to the second light incident region. The backlight module of claim 1, wherein the light source further comprises a substrate, the substrate comprising a bearing surface for arranging the plurality of first point light sources and the plurality of second point light sources, the bearing surface Parallel to the light incident surface of the light guide plate. A liquid crystal display device comprising a liquid crystal display panel and a backlight module for providing planar light to the liquid crystal display panel, wherein the backlight module uses the backlight module according to any one of claims 1 to 9.