CN201032081Y

CN201032081Y - Backlight module

Info

Publication number: CN201032081Y
Application number: CNU2007201401531U
Authority: CN
Inventors: 陈树盛
Original assignee: Taiwan Nano Electro Optical Technology Co Ltd
Current assignee: Fuxiang Industrial Co., Ltd.
Priority date: 2007-04-09
Filing date: 2007-04-09
Publication date: 2008-03-05
Anticipated expiration: 2017-04-09

Abstract

The utility model provides the backlight module of a subtle V-groove light guide plate in order to eliminate the easily generated imaging disadvantage of such backlight module at present, which is mainly provided with a plurality of subtle and parallel mirror V- shaped grooves at least on front side or underside. But in some regions (especially where near the light source or light source contra lateral region) the V-shaped groove angle irregularly and discontinuously changes. In this way, the luminance of the backlight module is improved, the luminance uniformity is improved and the easily generated appearance defect-imaging phenomenon of such module is effectively eliminated.

Description

Backlight module

Technical field

A kind of backlight module of the utility model, numerous fine minute surface V-grooves distribute on the LGP wherein, and discontinuous, the irregular variation of the V-groove angle of subregion, and can improve brilliancy of backlight module and uniformity, and effectively solve the outward appearance flaw of the imaging that this type of backlight module very easily produces.

Background technology

The employed LGP of backlight module, its exiting surface (front) or reflecting surface (bottom surface) have one side at least and are laid with fine structure, to reach the opticpath of advancing in the control LGP, after making light enter in the plate from the LGP side, can appear from the front on demand, and reach the function of comprehensively luminous area source.Mostly general the application is that requirement can make whole module become the area source of comprehensive uniformly light-emitting, and therefore shape, surface characteristic and the distribution design for the micro-structural on these LGP faces promptly seems very important.

The micro-structural of commonly using has with mode of printing and directly is printed on the site that forms on the LGP; Also have with sandblast mode or etching mode and on mould, cause fine point earlier, utilize ejection formation or thermoforming way to make the LGP of plastic material again.But requiring backlight module must meet under the requirement of high briliancy, oneself has the fine minute surface V-groove of use (V-groove) as the micro-structural on the LGP at present.No matter this kind mode all needs higher technology on design or manufacturing technology, but briliancy can be much higher than general fashion.

See also shown in Figure 1, commonly use V-groove LGP A in positive (exiting surface) A1 or bottom surface (reflecting surface) A2, fine V-groove A21 distributes, this V-groove A21 can be recessed or protruding structure, if there is not this fine V-groove A21, then the light B1 that sends of light source B appears because of the total reflection effect major part after light inlet side A3 enters LGP A from bright dipping side A4, can't be appeared by front surface A 1.

If on LGP front surface A 1 or bottom surface A2, V-groove is arranged, the light B1 that advances in LGP A meets these fine V-groove A2 through optical design, will destroy total reflection, light B1 be appeared by the front surface A 1 of LGP A, and become the luminous device of face.For the briliancy that makes whole light-emitting area is even, must make that the luminous energy that is appeared by the front is homodisperse to be appeared by whole LGP A front surface A 1.

For reaching this purpose, must arrange these fine V-groove A21 via proper optical design, need the factor of consideration and design to comprise the spacing of the angle of V-groove A21, every V-groove A21 and the degree of depth of every V-groove A21 etc. at least.

How common practices can be reached by the spacing of change V-groove A21: bigger by the spacing that enters light side A3, then little from the light inlet side A3 spacing far away that heals, spacing is gradually changed to close by thin, and as far as the briliancy effect of uniform.

Also have in addition to keep the spacing unanimity, but make near the degree of depth of the V-groove A21 of light inlet side A3 more shallowly, more then the degree of depth is darker away from light inlet side A3, and the degree of depth gradually changes from shallow to deep, and reaches the briliancy effect of uniform.

No matter but use which kind of mode, because of its angles of fine V-groove of these parallel distributions all is identical, though or angle changes, its angle changing is only in progressive mode, continuous and small gradually changes.

Because these trickle straight line V-groove A21 are parallel to each other, and the two sides of V-groove A21 is the very little minute surface of roughness, so these V-grooves that are arranged in parallel are just as the parallel mirror of a row, can cause the phenomenon of lamp source imaging: the regional area in module presents the bright line that is parallel to fluorescent tube, or bright line, concealed wire all phenomenons of being separated by alternately and occurring.This kind phenomenon is remarkable especially near light inlet side A3 zone (lamp source region).Thereby cause backlight module open defect, even influence the briliancy uniformity of module.

In addition in close bright dipping side A4 zone, because of part light can appear from bright dipping side A4,, can utilize the housing of the tool high reflectance of module in order to utilize these light again to improve the module briliancy, make light from housing after housing reflection, enter LGP A by bright dipping side A4 again.Therefore the open defect that occurs imaging in zone (offside zone, lamp source) too easily near bright dipping side 14.

Utilize the fine V-groove A21 of high specularity to have many good qualities than the LGP (as printing, etching mode) of alternate manner for the LGP A of structure, but aforesaid shortcoming but is to be difficult to overcome, very easily cause the bad order of light guide module, or briliancy uniformity variation.

Therefore, how above-mentioned disappearance is forgone, be the place of the technical difficulties of this case utility model people institute desire solution.

The utility model content

Main purpose of the present utility model provides a kind of backlight module, and its main purpose is in order effectively to eliminate the outward appearance flaw one imaging phenomenon that the V-groove on this LGP very easily produces.

Wherein the lamp source can be CCFL (CCFL) or light emitting diode (LED), and quantity can be more than one; Can be arranged at a side of module, also can separately be arranged at both sides, the blooming piece then demand of looking can use bloomings such as diffusion sheet, or brightening piece.

The technical scheme that the utility model adopted is: a kind of backlight module, it is characterized in that, and include: a light source; One LGP, its at least one side be distributed with the majority fine minute surface V-groove that is parallel to each other, wherein fine its angle of minute surface V-groove of subregion is irregular, discontinuous variation; All the other regional V-groove angles then for fixing or continuously, gradually change.

Wherein angle is that the spacing of the V-groove of irregular, discontinuous variation is fixed, but gash depth is then according to angle and spacing and change.

Angle is that the degree of depth of the V-groove of irregular, discontinuous variation is fixed, but spacing is then according to angle and gash depth and change.

This light source lays respectively at two offsides of LGP.

V-groove is the convex V-groove.

Described V-groove is the spill V-groove.

Fine its angle of minute surface V-groove in two zones of close the Lights section is irregular, discontinuous variation; The V-groove angle of all the other zone lines then for fixing or continuously, gradually change.

The reflecting surface of this LGP is provided with a reflector plate, and the exiting surface of LGP then is provided with an optics matrix and forms the bright dipping side.

The beneficial effects of the utility model are:

1. can eliminate backlight module front end (near the light inlet side) or rear end (near the bright dipping side) regional imaging generation.

2. make the backlight module performance to best color and brightness.

3. brightness uniformity.

Description of drawings

Fig. 1 is a generalized section of commonly using LGP;

Fig. 2 is the backlight module schematic diagram;

Fig. 3 is positioned at light inlet side schematic diagram for irregular change angle V-groove of the present utility model;

Fig. 4 is positioned at bright dipping side schematic diagram for irregular change angle V-groove of the present utility model;

Fig. 5 is positioned at light inlet side and bright dipping side schematic diagram for irregular change angle V-groove of the present utility model;

Fig. 6 all changes schematic diagram for the spacing and the degree of depth of irregular change angle V groove of the present utility model;

Fig. 7 fixes the change in depth schematic diagram for the spacing of irregular change angle V-groove of the present utility model;

Fig. 8 is that the spacing of irregular change angle V-groove of the present utility model changes, and the degree of depth is schematic diagram fixedly.

[figure number explanation]

A LGP A1 front (exiting surface)

A2 bottom surface (reflecting surface) A21 V-groove

A3 light inlet side A4 bright dipping side

B light source B1 light

1 LGP, 11 exiting surfaces (front)

12 reflectings surface (bottom surface), 121 irregular angle changing V-grooves

122 regular angular V-grooves, 13 smooth sides

14 bright dipping sides, 2 light sources

21 light, 3 lamp source reflectors

4 reflector plates, 5 blooming pieces

6 housings

The specific embodiment

For the effect that makes convenient simple and direct understanding further feature content of the present utility model of your auditor and advantage and reached can more manifest, with the utility model conjunction with figs., be described in detail as follows now:

Main purpose of the present utility model provides a kind of backlight module, and it includes spare parts (as shown in Figure 2) such as LGP 1, lamp source 2, lamp source reflector 3, reflector plate 4, at least one blooming piece 5 and housing 6.

Wherein lamp source 2 can be cold-cathode tube (CCFL) or light emitting diode (LED), and quantity can be more than one; A side of module can be arranged at, also both sides can be separately be arranged at.5 demands of looking of blooming piece can be used bloomings such as diffusion sheet, or brightening piece.

As Fig. 3, on the LGP 1 on exiting surface 11 or reflecting surface 12, at least one side is distributed with V-groove, V-groove is for being distributed on the reflecting surface 12 as shown in Figure 4, in the zone near light inlet side 13, the angle of this V-groove 121 is irregular, irregular variation, is not fixed angle, or gradual slow variation, the light source imaging shortcoming that just can avoid the fluorescent tube side like this.The V-groove 122 away from the zone of light inlet side 13 just can use fixed angle or the gradual change angle design of commonly using, and irregular V-groove 121 also can be arranged near bright dipping side 14 zones, now looks like phenomenon (as shown in Figure 2) with the imaging of avoiding bright dipping side 14 zones.

Also can be as Fig. 5, irregular V-groove 121 also can be arranged at zone and bright dipping side 14 zones near light inlet side 13 simultaneously, to avoid the imaging phenomenon in this two zone simultaneously.

See also shown in Figure 6, the utility model provides a kind of backlight module, mainly (all can in exiting surface 11 or bottom surface 12 in the one side of LGP 1 for it, present embodiment is for making V-groove in the bottom surface 12), 11 of another sides can be minute surface or micro-structural face, these LGP 1 one ends are light inlet side 13 again, these light inlet side 13 1 ends dispose light source 2, the light 21 that sends for light source 2 enters from light inlet side 13, see through the V-

groove

121 and 122 reflection rays 21 of LGP 1, make it from exiting surface 11 bright dippings, cause LGP 1 surface to produce brightness;

Wherein, this reflecting surface (bottom surface) 12 front end area (zone) from end face to 20 millimeters of approximately close light sources, the V-groove 121 of most concave shapes or convex form distributes, the angle of the V-groove 121 in this zone is to be irregular and irregular variation, to avoid identical or change continuously and cause the imaging of lamp source, make the backlight module bad order because of angle;

These irregular area V-groove 121 angles are irregular variation, but its degree of depth or spacing change then according to inhomogeneity requirement and the design that changes according to angle, get through optical design: can be constant spacing, varying depth (as Fig. 7); Also can be constant depth, varied pitch (as Fig. 8); Or spacing, the degree of depth the two all change (as Fig. 7).

Connection rules zone then after the region of disorder, 122 angles of the V-groove on it are identical, or continuous gradually variation, but its spacing then can be distributed by thin and close continually varying; Its degree of depth also can change from shallow to deep continuously, to reach inhomogeneity requirement.

For making the utility model show its progressive and practicality more, now with commonly use that to do a comparative analysis as follows:

The utility model advantage:

1. can eliminate backlight module front end (near the light inlet side) or rear end (near the bright dipping side) regional imaging Produce.

2. make the backlight module performance to best color and brightness.

3. brightness uniformity.

In sum, the utility model has reached institute really breaking through under the previous technical pattern The effect that wish is promoted, and also non-be familiar with this skill person institute easily full of beard and, moreover this practicality is newly Open before the type application, the progressive of its tool, practicality, it is aobvious that to have met utility model special Sharp application important document is so propose utility model application in accordance with the law.

Claims

1. a backlight module is characterized in that, includes: a light source; One LGP, its at least one side be distributed with the majority fine minute surface V-groove that is parallel to each other, wherein fine its angle of minute surface V-groove of subregion is irregular, discontinuous variation; All the other regional V-groove angles then for fixing or continuously, gradually change.

2. backlight module as claimed in claim 1 is characterized in that, angle is that the spacing of the V-groove of irregular, discontinuous variation is fixed, but gash depth is then according to angle and spacing and change.

3. backlight module as claimed in claim 1 is characterized in that, angle is that the degree of depth of the V-groove of irregular, discontinuous variation is fixed, but spacing is then according to angle and gash depth and change.

4. backlight module as claimed in claim 1 is characterized in that, this light source lays respectively at two offsides of LGP.

5. backlight module as claimed in claim 1 is characterized in that, V-groove is the convex V-groove.

6. backlight module as claimed in claim 1 is characterized in that, described V-groove is the spill V-groove.

7. backlight module as claimed in claim 4 is characterized in that, fine its angle of minute surface V-groove in two zones of close the Lights section is irregular, discontinuous variation; The V-groove angle of all the other zone lines then for fixing or continuously, gradually change.

8. backlight module as claimed in claim 1 is characterized in that the reflecting surface of this LGP is provided with a reflector plate, and the exiting surface of LGP then is provided with an optics matrix and forms the bright dipping side.