CN102086990A

CN102086990A - Backlight module

Info

Publication number: CN102086990A
Application number: CN200910225796XA
Authority: CN
Inventors: 程伟烜; 徐礼明
Original assignee: Coretronic Corp
Current assignee: Coretronic Corp
Priority date: 2009-12-07
Filing date: 2009-12-07
Publication date: 2011-06-08

Abstract

A backlight module comprises a light guide plate, an optical film group and at least one light-emitting element. The light guide plate is provided with a first light-emitting surface, a bottom surface opposite to the first light-emitting surface and a first light-incident surface connecting the first light-emitting surface and the bottom surface. The optical film set is arranged on the first light-emitting surface and comprises at least one optical film, the optical film is provided with a second light-emitting surface opposite to the second light-emitting surface and a side surface connecting the second light-emitting surface and the second light-emitting surface, the side surface of the optical film and the first light-emitting surface are positioned on the same side, and the side surface is provided with at least one notch. The light emitting element is arranged beside the first light incident surface and is suitable for emitting a light beam, and the light beam enters the light guide plate through the first light incident surface and is transmitted to the optical film group through the first light emergent surface. The invention can solve the problem of local bright spots generated by the optical film group close to the point light source, so that the backlight module achieves the effect of uniform light emission.

Description

Module backlight

[technical field]

The invention relates to a kind of module backlight and optical element thereof, and particularly relevant for a kind of side incident type module backlight and optical diaphragm group thereof.

[background technology]

Figure 1A is the explosive view of existing a kind of module backlight, and Figure 1B is the partial enlarged drawing of module backlight after combination of Figure 1A, please also refer to Figure 1A and Figure 1B.Existing display is to provide display floater required uniform area light source with module backlight.Existing module backlight 100 comprises a LGP 110, a light source assembly 120, a reflector plate 130, a lower frame 140a, a upper ledge 140b and several blooming pieces 150.Wherein, LGP 110 has an incidence surface 111 and an exiting surface 112.Light source assembly 120 is a LED optical strip (light emitting diode light bar), several light-emitting components 122 of light source assembly 120 cladding, light-emitting component 122 be light emitting diode (light emitting diode, LED).Reflector plate 130 is disposed at the below of LGP 110.Several blooming pieces 150, for example diffusion sheet, prismatic lens and brightening piece etc. all are located at the top of LGP 110, and are limited between LGP 110 and the upper ledge 140b.

The light beam that light source assembly 120 is sent is injected the incidence surface 111 of LGP 110, and utilizes total reflection principle to make light beam conduct to incidence surface 111 other ends with respect to LGP 110 of LGP 110.Light beam is destroyed its total reflection phenomenon by the micro-structural of the bottom surface 114 of LGP 110 in the process of conduction, and by exiting surface 112 outgoing of LGP 110.LGP 110 can change into area source with the light beam that light source assembly 120 sends, and the guiding light beam is passed to blooming piece 150.

Yet, light source assembly 120 is sides that are arranged at the incidence surface 111 of LGP 110, so the brightness meeting that is to say along with respect to the distance of light source assembly 120 and weaken gradually, part near light source assembly 120 positions can be brighter, and can be darker away from the part of these light source assembly 120 positions.Though, LGP 110 can make the segment beam in advancing produce the anaclasis phenomenon by micro-structural, in order to the brightness of range of lift light source assembly 120 than distal part part, but because the light-emitting component 122 of light source assembly 120 is a light emitting diode, light emitting diode is a spot light, for the part of the position that is close to light-emitting component 122, the briliancy of light-emitting component 122 fluorescence that produces still is higher than the briliancy of other positions, make module 100 backlight can form local bright spot, and produce the inconsistent problem of briliancy near a side of light source assembly 120.In addition,, have optically focused or increase the effect of forward briliancy, make that therefore the problem of bright spot of above-mentioned part is more obvious, and cause the uneven problem of bright dipping of area source because optical diaphragm group 150 comprises blooming pieces such as diffusion sheet, prismatic lens and brightening piece.

In order to solve the above problems, TaiWan, China patent publication No. 200700797 has disclosed the technology relevant with the problems referred to above with TaiWan, China patent announcement I286644 and I254823.

[summary of the invention]

The invention provides a kind of module backlight, can improve module backlight because of adopting spot light in the problem that forms local bright spot near the spot light place.

Other purposes of the present invention and advantage can be further understood from the disclosed technical characterictic of the present invention.

For reaching one of above-mentioned or partly or all purposes or other purposes, one embodiment of the invention propose a kind of module backlight, comprise a LGP, an optical diaphragm group and at least one light-emitting component.Wherein, LGP have one first exiting surface, with respect to a bottom surface of this first exiting surface and connect one first incidence surface of this first exiting surface and this bottom surface.Optical diaphragm group is arranged on first exiting surface, optical diaphragm group comprises at least one blooming piece, blooming piece has one second exiting surface of one second incidence surface, relative second incidence surface and connects second incidence surface and a side of second exiting surface, wherein, first incidence surface of the side of described blooming piece and LGP is positioned at the same side, and described side is provided with at least one breach.Light-emitting component is disposed at by first incidence surface, and wherein, light-emitting component is suitable for sending a light beam, and described light beam is suitable for entering in the LGP via first incidence surface, and is passed to optical diaphragm group via first exiting surface.

In one embodiment of this invention, optical diaphragm group comprise a diffusion sheet, a prismatic lens and a brightening piece at least one of them.

In one embodiment of this invention, at least one breach is shaped as an arc, a semicircle, an ellipse, a triangle, a taper or a polygon.

In one embodiment of this invention, at least one breach is several breach, has a spacing between the adjacent breach.

In one embodiment of this invention, at least one light-emitting component is adjacent to spacing.

In one embodiment of this invention, at least one light-emitting component is a light emitting diode.

In one embodiment of this invention, the position system of at least one breach setting is corresponding at least one light-emitting component.

In one embodiment of this invention, at least one breach is several breach, has a spacing between the adjacent breach, and at least one light-emitting component is several light-emitting components, and the position of each breach setting is corresponding to the light-emitting component of correspondence.

In one embodiment of this invention, the shape of breach is roughly corresponding to the profile of the luminous light field of light-emitting component.

Embodiments of the invention have following one of them advantage at least, in the module backlight of embodiments of the invention, first incidence surface of the side of blooming piece and LGP is positioned at the same side, and the side of blooming piece is provided with breach, therefore can improve in problem, so that reach comparatively effect of uniform of bright dipping at the module backlight of embodiments of the invention near the bright spot of the part that optical diaphragm group produced at spot light place.

[description of drawings]

Figure 1A is the explosive view of existing a kind of module backlight.

Figure 1B is the partial enlarged drawing of module backlight after combination of Figure 1A.

Fig. 2 A is the explosive view of a kind of module backlight of invention one embodiment.

Fig. 2 B is the schematic perspective view of module backlight after assembling of Fig. 2 A.

Fig. 2 C is the partial enlarged drawing of the module backlight of Fig. 2 B.

Fig. 3 A is the schematic perspective view after the module backlight of another embodiment of the present invention is assembled.

Fig. 3 B is the partial enlarged drawing of the module backlight of Fig. 3 A.

Fig. 4 A is the schematic perspective view after the module backlight of further embodiment of this invention is assembled.

Fig. 4 B is the partial enlarged drawing of the module backlight of Fig. 4 A.

100,200,300,400: module backlight

110,210: LGP

111: incidence surface

112: exiting surface

211: the first incidence surfaces

212: the first exiting surfaces

114,214: the bottom surface

120,220: light source assembly

122,222: light-emitting component

130,230: reflector plate

140a, 240a: lower frame

140b, 240b: upper ledge

150,250,350,450: blooming piece

250s, 350s, 450s: optical diaphragm group

251,351,451: the side of blooming piece

251a, 351a, 451a: breach

251b: spacing

252: the second exiting surfaces

254: the second incidence surfaces

[specific embodiment]

About aforementioned and other technology contents, characteristics and effect of the present invention, in the following detailed description that cooperates with reference to a graphic preferred embodiment, can clearly present.The direction term of being mentioned in following examples, for example: upper and lower, left and right, front or rear etc. only are the directions with reference to annexed drawings.Therefore, the direction term of use is to be used for illustrating not to be to be used for limiting the present invention.

Fig. 2 A is the explosive view of a kind of module backlight of one embodiment of the invention, and Fig. 2 B is the schematic perspective view of module backlight after assembling of Fig. 2 A, and Fig. 2 C is the partial enlarged drawing of the module backlight of Fig. 2 B.Please also refer to Fig. 2 A, Fig. 2 B and Fig. 2 C, the module backlight 200 of present embodiment comprises a LGP 210, at least one light source assembly 220, a reflector plate 230, a lower frame 240a, a upper ledge 240b and an optical diaphragm group 250s.In the present embodiment, module 200 backlight is the module backlight of monolateral side incident type, so the quantity of light source assembly 220 is example with one, but not as limit.Light source assembly 220 comprises at least one light-emitting component 222, and light source assembly 220 is a light-emitting diode light bar, and light-emitting component 222 is a light emitting diode.In the present embodiment, light source assembly 220 comprises several light-emitting components 222.LGP 210 has one first exiting surface 212, with respect to a bottom surface 214 of first exiting surface 212 and connect one first incidence surface 211 of first exiting surface 212 and bottom surface 214.Light source assembly 220 is arranged at first incidence surface, 211 sides of contiguous LGP 210.Reflector plate 230 is disposed at the below of LGP 210.Optical diaphragm group 250s be arranged at LGP 210 first exiting surface 212 on, and be limited between LGP 210 and the upper ledge 240b.Wherein, optical diaphragm group 250s comprises at least one blooming piece 250, at least one blooming piece 250 has one second exiting surface 252 of one second incidence surface 254, relative second incidence surface 254 and connects second incidence surface 254 and a side 251 of second exiting surface 252, side 251 is positioned at the same side with first incidence surface 211 of LGP 210, and side 251 is provided with at least one breach 251a.

It should be noted that, optical diaphragm group 250s comprise a diffusion sheet, a prismatic lens and a brightening piece at least one of them, in the present embodiment, optical diaphragm group 250s comprises several blooming pieces 250, and optical diaphragm group 250s for example comprises three blooming pieces 250; Please be simultaneously with reference to Fig. 2 A, in the present embodiment, the blooming piece 250 of optical diaphragm group 250s is respectively diffusion sheet on diffusion sheet, the brightening piece and by second incidence surface 254 in regular turn toward the direction of second exiting surface 252, but not as limit.The side 251 of the blooming piece 250 of optical diaphragm group 250s is provided with at least one breach 251a; In the present embodiment, the side of each blooming piece 250 is provided with several breach 251a, has a spacing 251b between adjacent breach 251a, each light-emitting component 222 is to be adjacent to spacing 251b, the position of spacing 251b is corresponding to the position between adjacent two light-emitting components 222 of correspondence, and the position of each breach 251a is the light-emitting component 222 corresponding to correspondence.The shape of each breach 251a is roughly corresponding to the profile of the luminous light field of light-emitting component 222.In the present embodiment, light-emitting component 222 for example is the light emitting diode or the semicircular light emitting diode of luminous light field shape approximation of positive luminous encapsulation type.Because the light field shape approximation semicircle of the light emitting diode of this type, for the light field shape of the form fit light-emitting component 222 of the breach 251a that makes blooming piece 250, therefore in the present embodiment, the shape of breach 251a such as Fig. 2 C are depicted as a semicircle.It should be noted that, the shape of breach 251a can be according to considering and do different designs in the profile of the luminous light field of light-emitting component 222 or other optical designs, for example in the present invention among other embodiment that do not illustrate, the shape of breach 251a can be an arc or an ellipse.

In the present embodiment, the light-emitting component 222 of light source assembly 220 is a spot light, and for the part of the position that is close to light-emitting component 222, the briliancy that light-emitting component 222 is produced is higher than the briliancy of other positions; Yet, because the blooming piece 250 of present embodiment is provided with breach 251a in the position of corresponding light-emitting component 222, in other words, part in the position of breach 251a there is no blooming piece 250 and covers, therefore the light beam by breach 251a is direct first exiting surface, 212 outgoing by LGP, do not pass through blooming piece 250, therefore can reduce the forward briliancy of part of the position of contiguous light-emitting component 222, and a side of improving module 200 close light source assemblies 220 backlight may form the problem of local bright spot, makes the module backlight 200 of present embodiment have comparatively effect of uniform of bright dipping.

Fig. 3 A is the schematic perspective view after the module backlight 300 of another embodiment of the present invention is assembled, and Fig. 3 B is the partial enlarged drawing of the module backlight of Fig. 3 A.Please refer to Fig. 3 A and Fig. 3 B, the module backlight 300 of present embodiment is similar to aforesaid module backlight 200, for convenience of description, among Fig. 3 A, Fig. 3 B and Fig. 2 B, Fig. 2 C similarly member all illustrate with same numeral.The module backlight 300 of present embodiment and the difference of aforementioned module 200 backlight be module 300 backlight optical diaphragm group 350s blooming piece 350 side 351 breach 351a be shaped as a triangle, in addition, the shape of breach 351a or big I are according to considering and do different designs in the profile of the luminous light field of light-emitting component 222 or other optical designs, for example in the present invention among other embodiment that do not illustrate, the shape of breach 351a can be a taper.The module backlight 300 of present embodiment has and above-mentioned module 200 similar effects backlight, no longer repeats at this.

Fig. 4 A is the schematic perspective view after the module backlight 400 of further embodiment of this invention is assembled, and Fig. 4 B is the partial enlarged drawing of the module backlight of Fig. 4 A.Please refer to Fig. 4 A and Fig. 4 B, the module backlight 400 of present embodiment is similar to aforesaid module backlight 200, for convenience of description, among Fig. 4 A, Fig. 4 B and Fig. 2 B, Fig. 2 C similarly member all illustrate with same numeral.The module backlight 400 of present embodiment and the difference of aforementioned module 200 backlight be module 400 backlight optical diaphragm group 450s blooming piece 450 side 451 breach 451a be shaped as a polygon, the limit number of breach 451a or big I are according to considering and do different designs in the profile of the luminous light field of light-emitting component 222 or other optical designs.The module backlight 400 of present embodiment has and above-mentioned module 200 similar effects backlight, no longer repeats at this.

It should be noted that in the above embodiments of the present invention each blooming piece of optical diaphragm group all is provided with breach, and the breach on the adjacent blooming piece is identical haply with position, shape and the size of spacing.Only in the present invention among other embodiment that do not illustrate, the breach on the adjacent blooming piece and the position of spacing, shape or big I are inequality respectively according to the demand of design, and the shape system of breach is selected from the group that is made up of an arc, a semicircle, an ellipse, a triangle, a taper or a polygon.

In addition, in the above embodiments of the present invention, each blooming piece of optical diaphragm group all is provided with breach.Only in the present invention among other embodiment that do not illustrate, can be according to the demand of design optionally the blooming piece at least wherein in optical diaphragm group be provided with breach.

In sum, embodiments of the invention have at least with next advantage, in the module backlight of the above embodiment of the present invention, the side of blooming piece and the incidence surface of LGP are positioned at the same side, and the side of blooming is provided with breach, therefore the part that can improve the position of contiguous light-emitting component forms the briliancy at bright spot place, forms the phenomenon of local bright spot and improve module backlight near a side of light source assembly, makes the module backlight of embodiments of the invention have comparatively effect of uniform of bright dipping.

The above, it only is preferred embodiment of the present invention, when not limiting scope of the invention process with this, promptly the simple equivalent of being done according to the present patent application claim and invention description content generally changes and modifies, and all still belongs in the scope that patent of the present invention contains.Arbitrary embodiment of the present invention in addition or claim must not reached the disclosed whole purposes of the present invention or advantage or characteristics.

Claims

1. A backlight module, comprising:

A light guide plate having a first light-emitting surface, a bottom surface opposite to the first light-emitting surface, and a first light-incident surface connecting the first light-emitting surface and the bottom surface; and

An optical film group, arranged on the first light-emitting surface, the optical film group includes at least one optical film, and the at least one optical film has a second light-incident surface, opposite to the second light-incident surface A second light exit surface and a side connecting the second light incident surface and the second light exit surface, wherein the side is located on the same side as the first light incident surface of the light guide plate, and at least one notch is provided on the side; and

At least one light emitting element is arranged beside the first light incident surface, wherein the at least one light emitting element is suitable for emitting a light beam, and the light beam is suitable for entering the light guide plate through the first light incident surface, and passing through the first light exit surface The surface is transferred to the optical film set.

2. The backlight module according to claim 1, wherein the optical film set comprises at least one of a diffusion film, a prism film and a brightness enhancement film.

3. The backlight module according to claim 1, wherein the shape of the at least one notch is an arc, a semicircle, an ellipse, a triangle, a cone or a polygon.

4. The backlight module according to claim 1, wherein the at least one notch is several notches, and there is a distance between adjacent notches.

5. The backlight module as claimed in claim 4, wherein the at least one light emitting element is adjacent to the distance.

6. The backlight module as claimed in claim 1, wherein the at least one light emitting element is a light emitting diode.

7. The backlight module as claimed in claim 1, wherein the position of the at least one notch is corresponding to the at least one light emitting element.

8. The backlight module according to claim 1, wherein the at least one notch is several notches, there is a distance between adjacent notches, the at least one light-emitting element is several light-emitting elements, and each of the The positions of the notches correspond to the corresponding light-emitting elements.

9. The backlight module as claimed in claim 1, wherein a shape of the at least one notch roughly corresponds to a shape of the light field of the at least one light emitting element.