CN201003697Y

CN201003697Y - Direct type backlight module

Info

Publication number: CN201003697Y
Application number: CNU2007200009961U
Authority: CN
Inventors: 陈树盛
Original assignee: Taiwan Nano Electro Optical Technology Co Ltd
Current assignee: Fuxiang Industrial Co., Ltd.
Priority date: 2007-01-29
Filing date: 2007-01-29
Publication date: 2008-01-09
Anticipated expiration: 2017-01-29

Abstract

The utility model relates to a downright type backlight mould, which comprises at least an illumination body capable of producing a plurality of light sources and a light dispersing board arranged above the illumination body; wherein the light dispersing board has a plurality of refraction parts, while the refraction parts are respectively arranged and formed into at least a high density area with a relatively tight and dense mode; wherein each high density area is positioned at the position of an illumination body nearby; when the light source irradiates onto the light dispersing board, the irradiation beam penetrating through the high density area can produce the refraction effect between the adjacent refraction parts; and then moves toward the direction close to the front, so as to increase the brightness of the light source and make the glazing degree produce an even qualification visual effect.

Description

The Staight downward type backlight module

Technical field

The utility model is meant a kind of Staight downward type backlight module that can produce equal brightening visual effect especially relevant for a kind of backlight module.

Background technology

Consult Fig. 1, backlight module 1 consisted predominantly of the light reflecting board 12 that fluorescent tube 11, that majority is arranged in parallel is arranged on these fluorescent tube 11 belows in the past, and a light diffusing sheet 13 that is arranged on these fluorescent tube 11 tops.This fluorescent tube 11 can produce the light source of number property along the line direction direct projection.But these light reflecting board 12 reflection source directive light diffusing sheets 13.This light diffusing sheet 13 can spread light and be projeced into liquid crystal panel (figure does not show).Only, because the incident angle of light source and light diffusing sheet 13 can influence light going direction, therefore, as the big light L1 of incident angle, when L2 penetrates light diffusing sheet 13, can be because refraction forms the light L1 ' toward the scattering of both sides, the place ahead, L2 ', and penetrating light, the light L3 of convergence direct projection fell apart 13 o'clock, then can form light L3 ' toward the place ahead direct projection, and act on light diffusing sheet 13 towards two side degradation luminosity modes with the center, so this light diffusing sheet 13 can form clear zone 13a over against the position of fluorescent tube 11, extend meeting towards both sides by clear zone 13a and form dark space 13b, make light diffusing sheet 13 produce the phenomenon of light and dark, and then cause local ghost, influence its brilliant degree.

Though have the dealer to attempt in clear zone 13a and dark space 13b to get ready or the mode of sandblast, the fine texture that is assigned density, the degree of depth or differs in size is used the brightness that influences light, keeps brilliant degree uniformity.But this mode can reduce whole brilliant degree, and must see through constantly test and practical experience, just can obtain preferable display effect, and the volume production of being difficult for, higher, the consuming time temple of cost disappearance are arranged.

Consult Fig. 2,, have the dealer to be formed with the raised line 141 that most equidistant parallels are arranged on a light diffusing sheet 14 surfaces then for solving above-mentioned disappearance.By this, when the light source of most fluorescent tubes 15 is incident to light diffusing sheet 14, can produce the phenomenon of light refractions, and then change the direct of travel of light, light be concentrated dispersed, keep higher brightness towards light diffusing sheet 14 the place aheads because of raised line 141.Only, though aforementioned lights diffuser plate 14 can improve the situation of light source degradation, when reality is used, still there is following disappearance and needs to be resolved hurrily:

Because these raised lines 141 are equidistantly on average to be located at light diffusing sheet 14 surfaces, therefore, the light L1 that incident angle is bigger, though L2 can change the light direct of travel by raised line 141, make light L1 ', L2 is towards leveling off to the direction diffusion in light diffusing sheet 14 the place aheads, but raised line 141 can make also, light L3 ' originally just advances towards light diffusing sheet 14 the place aheads, meet with raised line 141 back generation anaclasis phenomenons and be offset, so, though these light diffusing sheet 14 other positions can promote brightness, over against the position of fluorescent tube 15, but can reduce brightness on the contrary, have the phenomenon of light and shade equally, and the inconsistent disappearance of brilliant degree.

The utility model content

Therefore, the purpose of this utility model promptly can make brilliant degree keep conforming Staight downward type backlight module providing a kind of.

So Staight downward type backlight module of the present utility model comprises: an at least one illuminator and a light diffusing sheet.This illuminator can produce the light source of number property along the line direction direct projection.This light diffusing sheet is to be positioned at these illuminator one sides, and have majority and be formed on a surface and be formed with the drop refraction part with the surface, this majority refraction part is to be parallel to each other, and follow the illuminator length direction to extend, and arrange in mode more closely respectively and be formed with at least one high density area, each high density area is positioned at the position of adjacent illuminator, when light source is incident to light diffusing sheet, this passes the incident ray of high density area, can between adjacent refraction part, produce the anaclasis effect, advance with the direction in convergence dead ahead.

Effect of the present utility model is the brightness of energy blast light source, and makes brilliant degree produce the visual effect of homogenizing.

Description of drawings

Fig. 1 is a schematic diagram, and backlight module in the past is described;

Fig. 2 is a schematic diagram, and another kind of existing backlight module is described;

Fig. 3 is a stereogram, and the preferred embodiment of the utility model Staight downward type backlight module is described;

Fig. 4 is a schematic diagram, illustrates that this preferred embodiment produces the phenomenon of anaclasis;

Fig. 5 is a front view, and second kind of enforcement aspect of most refraction part in this preferred embodiment is described;

Fig. 6 is a front view, and the third enforcement aspect of most refraction part in this preferred embodiment is described;

Fig. 7 is a front view, and the 4th kind of enforcement aspect of most refraction part in this preferred embodiment is described;

Fig. 8 is a front view, and the 5th kind of enforcement aspect of most refraction part in this preferred embodiment is described;

Fig. 9 is a front view, and the 6th kind of enforcement aspect of most refraction part in this preferred embodiment is described.

[figure number explanation]

2---illuminator 31b---high density area

3---light diffusing sheet 4---light reflecting board

31---refraction part L1---light

311---plane of refraction L2---light

31a---low density area L3---light

The specific embodiment

Consult Fig. 3, Fig. 4, the preferred embodiment of the utility model Staight downward type backlight module comprises most illuminators 2, a light diffusing sheet 3 and a light reflecting board 4.

These illuminators 2 are a kind of fluorescent tubes at present embodiment, can produce the light source of number property along the line direction direct projection.

This light diffusing sheet 3 is to be positioned at these illuminator 2 tops, and has that majority is formed on a surface and by the refraction part 31 of rat.This majority refraction part 31 is the raised line that is reverse V-shaped at present embodiment, be to be parallel to each other and to follow illuminator 2 length directions to extend, and arrange in looser mode respectively, be formed with several low density area 31a, and, be formed with several high density area 31b with side's arrangement more closely.Each refraction part 31 is formed with two planes of refraction 311 towards adjacent refraction part 31 respectively.Each low density area 31a is over against illuminator 2, and each high density area 31b is adjacent to low density area 31a, and is positioned at illuminator 2 sides.

This light reflecting board 4 is these illuminator 2 belows, position, but reflection source makes light source be incident to this light diffusing sheet 3 after reflection.

When these illuminators 2 and by the light source after light reflecting board 4 reflections, when being incident to this light diffusing sheet 3, the light of this incident produces the phenomenon of anaclasis because of the plane of refraction 311 of refraction part 31, at this moment, the light L1 that this incident angle is bigger, L2, can arrange because the refraction part 31 of high density area 31b is intensive state, make the light L1 that injects, L2 almost can both directive refraction part 31 plane of refraction 311, and then the phenomenon of generation anaclasis, make the light L1 ' after the refraction, L2 ' is by plane of refraction 311 gradients, change direct of travel, and with the directional divergence in convergence light diffusing sheet 3 the place aheads.As for incident angle less light L3, L4, can arrange because the refraction part 31 of low density area 31a is loose state, make light L3, L4 major part can both directly penetrate light diffusing sheet 3, and disperse towards light diffusing sheet 3 the place aheads, few part is the plane of refraction 311 of directive refraction part 31 then, produces the phenomenon of anaclasis.By this, light is concentrated dispersed towards light diffusing sheet 3 the place aheads, can effectively promote brightness, the high density area 31b after this lifting brightness can produce the brilliant degree that reaches unanimity with low density area 31a, and makes whole brilliant degree produce the visual effect that homogenizes.

Certainly, the angle theta of the degree of depth L of each V-type refraction part 31 and plane of refraction 311 changes, and all can change the effect of anaclasis, and can do suitable configuration to these V-type refraction part 31 according to actual demand.

What deserves to be mentioned is, consult Fig. 5, Fig. 6, Fig. 7, the moulding of this refraction part 31 also can be ladder type, semi-circular, triangular form etc., or as Fig. 8, shown in Figure 9, form most by light diffusing sheet 3 surface depressions and generally be triangular form, semi-circular refraction part 31, these refraction part 31 raised or sunken and different modeling can make whole luminosity produce the visual effect that homogenizes by aforementioned density queueing discipline equally.

According to the above as can be known, Staight downward type backlight module of the present utility model has following advantage and effect:

Because the utility model can be when light source be incident to light diffusing sheet 3, make the less light of incident angle, when penetrating low density area 31a, maintenance is towards the characteristic of light diffusing sheet 3 the place aheads diffusion, and can reduce the situation of brightness deterioration, and the light that this incident angle is bigger, can be because of passing through the adjacent refraction part 31 of high density area 31b, produce the anaclasis effect, advance with the direction in convergence dead ahead, and the brightness of energy blast light source light, reduce the situation of scattering, more can keep the uniformity of brilliant degree at the same time, the utility model and backlight module (as the first known example and the second known example of this case) are in the past compared, more can produce the visual effect that homogenizes aspect the brilliant degree.

Yet the above person, it only is preferred embodiment of the present utility model, when not limiting the scope that the utility model is implemented with this, promptly the simple equivalent of being done according to the utility model claim and utility model description generally changes and modifies, and all should still belong in the scope that the utility model patent contains.

Claims

1, a kind of Staight downward type backlight module is characterized in that, comprises:

At least one illuminator that produces number property along the line direction direct projection light source;

One light diffusing sheet, be to be positioned at these illuminator one sides, and have majority and be formed on a surface and be formed with the refraction part of drop with the surface, this majority refraction part is to be parallel to each other, and follow the illuminator length direction to extend, and arrange in mode more closely respectively and be formed with at least one high density area, each high density area is the position that is positioned at adjacent illuminator.

2, Staight downward type backlight module as claimed in claim 1 is characterized in that, each refraction part is formed with two planes of refraction towards adjacent refraction part respectively.

3, Staight downward type backlight module as claimed in claim 1 is characterized in that, the moulding of this refraction part is V-type, ladder type, semi-circular wherein a kind of.

4, Staight downward type backlight module as claimed in claim 1 is characterized in that, most refraction part of this light diffusing sheet are the surface depression.

5, Staight downward type backlight module as claimed in claim 1 is characterized in that, most refraction part of this light diffusing sheet are rat.

6, Staight downward type backlight module as claimed in claim 1 is characterized in that, this light diffusing sheet is arranged in looser mode in addition, is formed with at least one low density area, and each low density area is over against illuminator.

7, Staight downward type backlight module as claimed in claim 1 is characterized in that, but more includes a light reflecting board that is positioned at these illuminator opposite sides and reflection source.