CN101051148A

CN101051148A - Back light module

Info

Publication number: CN101051148A
Application number: CN 200610074179
Authority: CN
Inventors: 陈汉荣
Original assignee: YANGXIN PRECISION CO Ltd
Current assignee: YANGXIN PRECISION CO Ltd
Priority date: 2006-04-07
Filing date: 2006-04-07
Publication date: 2007-10-10

Abstract

A back light module is prepared for arranging light guide body with a light incoming surface and light path regulation slot set on incoming surface of light guide body on light guide plate, setting linear light source at a side of said light incoming surface, using linear light source to provide a light beam and leading said light beam to enter into light guide body through said light incoming surface after path of light beam is regulated by light path regulation slot.

Description

Backlight module

[technical field]

The invention relates to a kind of backlight module (backlight module), and particularly about a kind of backlight module that improves brightness uniformity.

[background technology]

With LCD, it is made of a liquid crystal panel and a backlight module.Liquid crystal panel is made of two transparency carriers and the liquid crystal layer that is disposed between this two transparency carrier, and backlight module then is in order to provide this liquid crystal panel required light source, so that LCD reaches the effect of demonstration.Specifically, backlight module is made of light source and light guide plate.Wherein, light source is in order to provide light guide plate light, and it for example is a fluorescent tube, and the light that is incident in the light guide plate is penetrated by the exiting surface of light guide plate via refraction or reflection again, to provide liquid crystal panel required light source.Yet,, therefore influenced the display quality of LCD because therefore the characteristic of light in the corner (two ends of fluorescent tube just) of light guide plate light inlet side dark angle problem can take place usually, or make backlight module can't provide liquid crystal panel uniform brightness.

[summary of the invention]

Purpose of the present invention is exactly to provide a kind of via adjusting opticpath, to improve the backlight module of brightness uniformity.

For reaching above-mentioned purpose, the present invention proposes a kind of backlight module, it comprises a light guide plate and a line source, wherein, light guide plate comprises that the light path that a light guide body and with an incidence surface is arranged on the incidence surface of light guide body adjusts groove, and in addition, line source is disposed at by the incidence surface, and line source is suitable for providing a light, and the path of light system just enters the light guide body from incidence surface after adjusting the groove adjustment via light path.In a preferred embodiment of the present invention, light path is adjusted groove and is comprised a plurality of interconnective sub-incidence surfaces, and the light that line source provided is to enter light path by sub-incidence surface to adjust groove.Wherein, each sub-incidence surface for example is plane or curved surface, and the bearing of trend of each sub-incidence surface is parallel with the bearing of trend of line source or press from both sides an angle.It is one-body molded that light guide body and light path are adjusted groove.

In sum, the present invention adjusts groove because of adopting light path, and after light path was adjusted groove adjustment opticpath, light just can enter light guide body from incidence surface, therefore can make backlight module provide liquid crystal panel uniform brightness.

[description of drawings]

Fig. 1 is the synoptic diagram of a kind of LCD of the present invention.

Fig. 2 A is the light guide plate of a preferred embodiment of the present invention and the schematic perspective view of fluorescent tube.

Fig. 2 B is the partial schematic diagram of light guide plate among Fig. 2 A.

Fig. 3 is the light path synoptic diagram of Fig. 2 A.

Fig. 4 A is the light guide plate of another preferred embodiment of the present invention and the schematic perspective view of fluorescent tube.

Fig. 4 B is the partial schematic diagram of light guide plate among Fig. 4 A.

Fig. 5 is the light path synoptic diagram of Fig. 4 A.

Fig. 6 is that the light path of one embodiment of the invention is adjusted the groove synoptic diagram.

Fig. 7 is that the light path of one embodiment of the invention is adjusted the groove synoptic diagram.

Fig. 8 is that the light path of one embodiment of the invention is adjusted the groove synoptic diagram.

Fig. 9 A is the synoptic diagram of the backlight module of yet another embodiment of the invention.

Fig. 9 B is the partial enlarged drawing of the light guide plate of Fig. 9 A.

For above and other objects of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly, and cooperate appended graphicly, be described in detail below.

[embodiment]

Please refer to Fig. 1, LCD 200 is made of the liquid crystal panel 150 that backlight module 100 and is placed on the backlight module 100.Wherein, backlight module 100 comprises a light guide plate 110 and a line source 120.Light guide plate 110 comprises that the light path that a light guide body 112 and with an incidence surface 112a is arranged on the incidence surface 112a of light guide body 112 adjusts groove 114.Line source 120 is disposed at by the incidence surface 112a, and line source 120 is suitable for providing a light 122, and the path P of light 122 is to adjust groove 114 via light path just to enter the light guide body 112 from incidence surface 112a after adjusting.

Line source 120 for example is made up of fluorescent tube 124 and reflex housing 126.Wherein, fluorescent tube 124 is disposed at by the incidence surface 112a, and fluorescent tube 124 is suitable for emitting beam 122.Reflex housing 126 covers fluorescent tube 124 in order to cover, reflexes in the light guide plate 110 with the light 122 that fluorescent tube 124 is sent, to improve the light source utilization factor of backlight module 100.In addition, for lightguide plate fixing 110 and line source 120, more can use a metal framework 130 that backlight module 100 is enveloped.In addition, between backlight module 100 and liquid crystal panel 150, can also dispose an optical diaphragm group 140, to increase the display quality of LCD 200.

Please refer to Fig. 1, Fig. 2 A and Fig. 2 B, it is a plurality of interconnective sub-incidence surface 114a that the light path of present embodiment is adjusted groove 114, and the light 122 that line source 120 is provided is to enter light path by sub-incidence surface 114a to adjust groove 114.Wherein, the bearing of trend of each sub-incidence surface 114a for example is parallel with the bearing of trend of line source 120, and each sub-incidence surface 114a for example is plane or curved surface.

Fig. 3 is the light path synoptic diagram of Fig. 2 A.In order to make icon comparatively succinctly understandable, so this figure only illustrates a fluorescent tube 124 replacing line source 120 at this, and the opticpath that omits reflex housing 126 and reflected by reflex housing 126.Please refer to Fig. 3, when fluorescent tube 124 provides light 122 to light guide plate 110, light 122 enters light path via sub-incidence surface 114a earlier and adjusts in the groove 114, light path adjustment groove 114 utilizes after the direction of refraction principle with the path P of adjustment light 122 of light then, and light 122 is just entered in the light guide body 112 by the incidence surface 112a of light guide body 112.Same, the light 122 that is reflected via reflex housing 126 (being illustrated in Fig. 1) also is to enter light path via sub-incidence surface 114a to adjust in the groove 114, after the direction of the path P of light path adjustment groove 114 adjustment light 122, light 122 enters in the light guide body 112 more then.Therefore, backlight module 100 can obtain uniformly brightness, and and then improves the display quality of display 200.

Fig. 4 A is the light guide plate of another preferred embodiment of the present invention and the schematic perspective view of fluorescent tube, and Fig. 4 B is the partial schematic diagram of light guide plate among Fig. 4 A, and Fig. 5 is the light path synoptic diagram of Fig. 4 A.Please also refer to Fig. 4 A, Fig. 4 B and Fig. 5, different with the foregoing description is, it is to be located on the incidence surface 112a at corresponding fluorescent tube 124 two ends that light path is adjusted groove 114 ', and the bearing of trend of the sub-incidence surface 114 ' a of light path adjustment groove 114 ' is approximately perpendicular to the bearing of trend of line source 120.Therefore, see it by the top of light guide plate 110, when light 122 entered light path and adjusts groove 114 ' via sub-incidence surface 114 ' a, light path was adjusted the direction that groove 114 ' is adjusted the travel path P of light 122.So the light 122 of part is after entering light guide body 112, the direction that light 122 is advanced can be partial to the two ends of fluorescent tube 124, to improve the dark angle problem of backlight module 100 in fluorescent tube 124 two ends light 122 deficiencies.

Fig. 6, Fig. 7 and Fig. 8 illustrate the light path adjustment groove synoptic diagram into other embodiment of the present invention respectively.By the above embodiments as can be known, the present invention utilizes the refraction principle of light to change the path P of light 122, so that backlight module 100 can obtain preferable brightness uniformity.Therefore, under this spirit, light path is adjusted groove 114 ' can also following variation according to different demands.For instance, light path is adjusted in the structure 114 ', and two adjacent light entrance face 114 ' a have a crest line 114 ' b, and crest line 114 ' b can be a straight line, and crest line 114 ' b and with a bottom surface 116 folders, the one angle θ 1 of light guide plate 110, as shown in Figure 6.Perhaps, those crest lines 114 ' b that light path is adjusted structure 114 ' can be a skew curve, and its arrangement mode can be rule or irregular, as shown in Figure 7.Certainly, those crest lines 114 ' b of light path adjustment structure 114 ' more can be the curve of symmetric offset spread.

Fig. 9 A is the synoptic diagram of the backlight module of yet another embodiment of the invention, and Fig. 9 B is the partial enlarged drawing of the light guide plate of Fig. 9 A.In the backlight module 100 of the backlight module 100 ' of Fig. 9 A and Fig. 1, same or analogous label is promptly represented identical assembly, therefore repeats no more herein.Please also refer to Fig. 9 A and 9B, different with the above embodiments is that the light path of present embodiment is adjusted groove 114 " have continuous sub-incidence surface 114c, and this continuous sub-incidence surface 114c for example is plane or curved surface.More specifically, sub-incidence surface 114c for example is by a plurality of discontinuous sub-incidence surfaces 114 " curved surface that forms of a construction.When fluorescent tube 124 provided light 122, light 122 entered light path via the sub-incidence surface 114c that for example is curved surface and adjusts groove 114 " in.Then, light path is adjusted groove 114 " adjust the direction of the path P of light 122, light 122 enters light guide body 112 by incidence surface 112a again.Therefore, backlight module 100 ' can obtain preferable brightness uniformity.

It should be noted that in the above-described embodiment it for example is one-body molded that light guide body 112 is adjusted groove 114 ' with light path, or can make light path earlier and adjust groove 114 ', again light path is adjusted groove 114 ' and be installed on the light guide body 112.

In sum, the path direction when the present invention uses light path to adjust groove light is seen through refraction and adjusts light and enter light guide body so that backlight module can obtain brightness uniformly, therefore can promote the display quality of LCD.

Though the present invention discloses as above with preferred embodiment, so it is not in order to limit the present invention.

[primary clustering symbol description]

100,100 ': backlight module

110: LGP

112: light guide body

112a: incidence surface

114,114 ', 114 ": light path is adjusted groove

114a, 114 ' a, 114 " a, 114c: sub-incidence surface

114 ' b: crest line

120: line source

122: light

124: fluorescent tube

126: reflector

130: metal framework

140: optical diaphragm group

150: liquid crystal panel

200: LCD

Claims

1. backlight module is characterized in that: comprising:

One light guide plate comprises:

One light guide body has an incidence surface; And

One light path is adjusted groove, is to be arranged on this incidence surface; And

One line source is disposed at by this incidence surface, and wherein this line source is suitable for providing a light, and the path of this light is just to enter this light guide body from this incidence surface after adjusting the refraction of groove via this light path.

2. backlight module as claimed in claim 1 is characterized in that: this light path is adjusted groove and is comprised interconnective a plurality of sub-incidence surface, and this light that this line source provided is to enter this light path by this a little incidence surface to adjust groove.

3. backlight module as claimed in claim 2 is characterized in that: each this a little incidence surface comprises plane or curved surface.

4. backlight module as claimed in claim 2 is characterized in that: the bearing of trend of each this a little incidence surface is parallel with the bearing of trend of this line source.

5. backlight module as claimed in claim 2 is characterized in that: the bearing of trend of each this a little incidence surface and the bearing of trend of this line source press from both sides an angle.

6. backlight module as claimed in claim 1 is characterized in that: this light path is adjusted groove and is had a continuous sub-incidence surface.

7. backlight module as claimed in claim 6 is characterized in that: this sub-incidence surface comprises plane or curved surface.

8. backlight module as claimed in claim 1 is characterized in that: it is one-body molded that this light guide body and this light path are adjusted groove.