CN101359124A - Backlight module - Google Patents

Abstract

The invention discloses a backlight module and the application thereof; the direct type backlight module comprises a backboard and a plurality of light-emitting units, wherein, the backboard is provided with a bottom part and a light exit port; and the light-emitting units are located between the bottom part and the light exit port. The backlight module is characterized in that a distance which is actually less than 15mm is kept between the adjacent light-emitting units, so that the backlight module can eliminate the use of a diffusion board under the same ambiguity specifications so as to actually increase more than 10% of light transmittance.

Description

Backlight module

Technical field

The present invention relates to a kind of backlight module and application thereof, particularly relate to a kind of direct type backlight module and application thereof.

Background technology

Backlight module general reference can provide the optical module of area source, be used at present products such as various information, communication, consumer products LCD (Liquid Crystal Display, LCD) on.Can divide into two kinds of side-light type and straight-down negatives according to the structure difference, the large scale liquid crystal display adopts direct type backlight module mostly at present.Generally speaking direct type backlight module mainly is made up of light source, diffuser plate and other blooming piece.Usually when assembling light source, diffuser plate and other blooming piece, need a framework to be fixed.

Please refer to Fig. 1, be structure explosive view according to a kind of direct type backlight module that known technology illustrated.In Fig. 1, direct type backlight module 100 comprises the backboard 101 of reflecting plate 102, fluorescent tube 104, blooming piece (generally comprising diffuser plate 106 and other blooming piece 108) and fixation reflex plate 102, fluorescent tube 104 and blooming piece.

Along with the attention of the mankind, and to power saving, simple and lightening requirement to the euphorosia degree, provide high evenly, Gao Hui (bright) degree, wide viewing angle become the main trend of product design.In order to improve the light uniformity coefficient, known technology is set about from light service efficiency that improves backlight module and the light mixing distance that shortens light source.For reaching above-mentioned requirement, light source must keep the light mixing distance of certain distance with the optical emission exit of backlight module, yet this light mixing distance degree has but limited the slimming of backlight module.Have again, when thin more or light-source brightness improves when the thickness of backlight module, because several light source profiles of arranging in regular turn very easily cause the bright band and the shade of luminance nonuniformity.In order to address this problem, known technology adopts the diffuser plate scattering to handle, and printing shading site on diffuser plate reaches the effect that makes the light atomizing with bright band and the shade of eliminating light source, and makes the briliancy of picture more even.

But, the setting of any blooming piece, the chemical material extinction that unavoidable ground can cause diaphragm itself and is coated with causes the light service efficiency to reduce, local warpage (waving) problem of the diaphragm of will deriving simultaneously.Diffuser plate printing shading site can reduce because of extinction causes the light service efficiency; If adjust the shape of diffuser plate, it is uneven and cause the diffuser plate warping phenomenon that thermal expansion easily takes place again.

Therefore be necessary to provide a kind of area source of taking into account light service efficiency, uniformity coefficient and slimming.

Summary of the invention

The object of the present invention is to provide a kind of backlight module and application thereof, its simple structure, assembling are easily and can reduce the use of optics matrix.

To achieve these goals, the invention provides a kind of backlight module, this backlight module comprises a backboard, several luminescence units, wherein this backboard has a bottom and an optical emission exit, and these luminescence units is characterized in that between this bottom and this optical emission exit, have the distance of essence between the adjacent luminescence unit less than 15mm, make backlight module under same blur level specification, can get rid of the use diffuser plate, and increase the penetrability of essence more than 10%.

Another embodiment of the present invention provides a kind of LCD, and this kind LCD comprises Liquid Crystal Module, and is located at the backlight module on the Liquid Crystal Module.And backlight module comprises a backboard, several luminescence units, wherein this backboard has a bottom and an optical emission exit, these luminescence units are between this bottom and this optical emission exit, it is characterized in that, have the distance of essence between the adjacent luminescence unit less than 15mm, make backlight module under same blur level specification, can get rid of the use diffuser plate, and increase the penetrability of essence more than 10%.

According to the foregoing description, technical characterictic of the present invention is, uses a kind of planar light source to increase brightness (bright) degree of emergent ray.Again because planar light source has several luminescence units, and the spacing essence of each luminescence unit and adjacent luminescence unit is less than 15mm, and arrangement quite closely is difficult for causing the phenomenon of the bright dark inequality of light source profile briliancy, can significantly improve the light uniformity coefficient of backlight module.

Therefore the backlight module that embodiments of the invention provided not only has briliancy height and advantage of uniform light exit, also can replace traditional diffuser plate, reaches to reduce the purpose of using blooming piece.Because the light mixing distance of luminescence unit is dwindled, also can reduce the mixed light height of backlight module simultaneously in addition, reach the purpose of slimming backlight module.

Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.

Description of drawings

Fig. 1 is the structure explosive view according to a kind of direct type backlight module that known technology illustrated;

Fig. 2 A is a kind of section of structure that uses direct type backlight module 200 as the LCD 20 of area source that preferred embodiment illustrated of basic invention;

Fig. 2 B is the assembly plan view of the luminescence unit that illustrated according to a preferred embodiment of the present invention;

Fig. 2 C is the assembly plan view according to the luminescence unit that another preferred embodiment of the present invention illustrated;

Mercury-free plane lamp 300 structural representations of Fig. 3 for being illustrated according to a preferred embodiment of the present invention.

Wherein, Reference numeral:

100: backlight module 101: backboard

102: reflecting plate 104: fluorescent tube

106: diffuser plate 108: blooming piece

20: LCD

21: Liquid Crystal Module 200: backlight module

202: backboard 202a: bottom

202b: optical emission exit 204: reflecting plate

206a: luminescence unit 206b: luminescence unit

206c: luminescence unit 210: optics sheet material

212: blooming piece 300: mercury-free plane lamp

301: base material 303: transparent substrates

305: sealant 306a: luminescence unit

306b: luminescence unit 307: airtight chamber

308: fluoresent coating

315: the second electrodes of 313: the first electrodes

317: 319: the four electrodes of third electrode

D: distance

Embodiment

The invention provides a kind of simple structure, assembling easily and can reduce the backlight module and the application thereof of the use of optics matrix.For purpose of the present invention, feature, advantage, method for making and use-pattern can be become apparent, below will be illustrated as the LCD of area source with a kind of direct type backlight module that uses.

Please refer to Fig. 2 A, be a kind of section of structure that uses direct type backlight module 200 as the LCD 20 of area source that preferred embodiment illustrated according to invention.In an embodiment of the present invention, LCD 20 comprises Liquid Crystal Module 21 at least and is located at direct type backlight module 200 on the Liquid Crystal Module 21.

Backlight module 200 comprises backboard 202, reflecting plate 204 and several luminescence units, for example luminescence unit 206a, 206b and 206c at least.Its dorsulum 202 is a kind of by the housing that metal material constituted, and has a bottom 202a and an optical emission exit 202b, is used for holding reflecting plate 204 and luminescence unit 206a, 206b and 206c.

Reflecting plate 204 is used for antireflection part by the light that luminescence unit 206a, 206b and 206c are provided between backboard 202 bottom 202a and luminescence unit 206a, 206b and 206c, make it penetrate backlight module 200 from optical emission exit 202b.But among other embodiment of the present invention, the bottom 202a of backboard 202 is a reflecting surface, is coated with a reflecting coating, is used for replacing reflecting plate 204.

Luminescence unit 206a, 206b and 206c are between reflecting plate 204 and optical emission exit 202b, and each luminescence unit, and for example one of luminescence unit 206a, 206b and 206c have the distance of essence less than 15mm between the luminescence unit that is adjacent.In some embodiments of the invention, luminescence unit 206a, 206b and 206c can be by cathode fluorescent tube (Cold Cathode Fluorescent Lamp; CCFL), hot-cathode fluorescent lamp, light emitting diode (LED), electroluminescence sheet (EL) or above-mentioned combination in any constitute.

Please refer to Fig. 2 B and Fig. 2 C, Fig. 2 B is the assembly plan view of the luminescence unit that illustrated according to a preferred embodiment of the present invention, and Fig. 2 C is the assembly plan view according to the luminescence unit that another preferred embodiment of the present invention illustrated.Among present embodiment, each luminescence unit, for example luminescence unit 206a, 206b or 206c are strip and are arranged in parallel.But among other preferred embodiment of the present invention, each luminescence unit, for example luminescence unit 206a, 206b or 206c are bar arranged (illustrating as Fig. 2 C).

Among preferred embodiment of the present invention, luminescence unit is contained among the mercury-free plane lamp 300.Please refer to Fig. 3, mercury-free plane lamp 300 structural representations of Fig. 3 for being illustrated according to a preferred embodiment of the present invention.Wherein mercury-free plane lamp 300 comprises: luminescence unit (for example luminescence unit 306a and 306b), base material 301, transparent substrates 303, sealant 305 and fluoresent coating 308.

Wherein base material 301 is a kind of bottom glass (Bottom Glass) layer, is used for carrying luminescence unit 306a and 306b.Transparent substrates 303 is a kind of top glass (Top Glass) layers that are positioned on the base material 301, can be used to be coated with fluorescent material, forms fluoresent coating 308.Bottom glass layer and top glassy layer link mutually by the sealant 305 that is surrounded on both peripheries, hold xenon (Xe) so as to forming an airtight chamber 307.It should be noted that among other embodiment base material 301 and transparent substrates 303 can be the plasticized board or the semiconductor sheet material of other light-permeable.

Luminescence unit 306a is made of first electrode 313 and second electrode 315, and luminescence unit 306b then is made of third electrode 317 and the 4th electrode 319.Wherein first electrode 313, second electrode, 315 third electrodes 317 and the 4th electrode 319 are for being parallel to the strip electrode on the base material 301, and two adjacent electrodes, for example between second electrode 315 and the third electrode 317 or between first electrode 313 and second electrode 315, one distance, d is apart arranged, and this distance, d essence is less than 15mm.In the present embodiment, luminescence unit 306a and 306b come fluorescence excitation coating 308 to send visible light by two electrode effluves.In preferred embodiment of the present invention, the fluorescence material not only is coated on the top glassy layer, and can also be coated on the inwall of airtight chamber 307.

Refer again to Fig. 2 A, among present embodiment, backlight module 200 comprises that also at least one optics sheet material 210 is located between planar light source 206 and the optical emission exit 202b.Wherein optics sheet material 210 can be by clear glass, plastics (polymethylmethacrylate (Polymethyl Methacrylate for example; PMMA), polycarbonate (Polycarbonate; PC), polystyrene (Polystyrene, PS)) sheet material, diffuser plate or above-mentioned combination in any are formed.

Backlight module 200 in addition, comprise that also one deck optical mode sheet 212 is as clear glass, plastic plate, low scattering diffuser plate, diffusion sheet, rhombus lens, reflective polar biased sheet (as the DBEF of Minnesota Mining and Manufacturing Company series) or above-mentioned combination in any at least, between luminescence unit 206a, 206b and 206c and optical emission exit 202b, be used for improving Liquid Crystal Module 21 emergent ray brightness (bright) degree and equal photosensitiveness.

According to the above description, embodiments of the invention adopt a kind of several spacing essence increase emergent ray less than the luminescence unit of 15mm brightness (bright) degree that has.Because each adjacent luminescence unit, arrange quite closely, help the mixed light effect of light, can prevent that light source from producing the phenomenon of the bright dark inequality of profile briliancy, and can significantly improve the light uniformity coefficient of backlight module, so as to saving the use of diffuser plate or other optics matrix.The mixed light of adding light is respond well, also can reduce the light mixing distance of backlight module simultaneously, reaches the purpose of slimming backlight module.

Therefore the backlight module that embodiments of the invention provided, have not only that profile is frivolous, briliancy is high and advantage of uniform light exit, also can replace traditional diffuser plate, reach and reduce the purpose of using blooming piece to reduce cost of products, can make backlight module under same blur level specification, can get rid of the use diffuser plate, and increase the penetrability of essence more than 10%.

Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.

Claims (10)

1, a kind of backlight module, comprise a backboard, several luminescence units, wherein this backboard has a bottom and an optical emission exit, these luminescence units are between this bottom and this optical emission exit, it is characterized in that having the distance of essence between these adjacent luminescence units, make this backlight module under same blur level specification less than 15mm, can get rid of and use a diffuser plate, and increase the penetrability of essence more than 10%.

2, backlight module according to claim 1 is characterized in that, these luminescence units are contained among the mercury-free plane lamp, and this mercury-free plane lamp comprises:

One base material is in order to carry these luminescence units;

One transparent substrates is positioned on this base material, in order to be coated with this fluoresent coating;

One sealant is used for forming an airtight chamber to hold xenon with this base material and this transparent substrates; And

One fluoresent coating is formed on the inwall of airtight chamber.

3, backlight module according to claim 2 is characterized in that, each this luminescence unit comprises one first electrode and one second electrode, is formed on this base material.

4, backlight module according to claim 3 is characterized in that, the distance of essence less than 15mm apart arranged between this first electrode and this second electrode.

5, backlight module according to claim 3 is characterized in that, this first electrode and this second electrode excite this fluoresent coating to send visible light by effluve.

6, backlight module according to claim 1 is characterized in that, also comprises a reflection horizon, between this bottom and these luminescence units or on this base material.

7, backlight module according to claim 1, it is characterized in that, comprise that also a blooming piece is located between this planar light source and this optical emission exit, and this blooming piece is selected from a group that is made up of clear glass, plastic plate, low scattering diffuser plate, diffusion sheet, prismatic lens, reflective polar biased sheet and above-mentioned combination in any.

8, backlight module according to claim 1 is characterized in that, comprises that also one UV Absorption/reflection horizon is between this bottom and this planar light source or on this base material.

9, backlight module according to claim 1 is characterized in that, this luminescence unit is strip and is arranged in parallel.

10, backlight module according to claim 1 is characterized in that, this luminescence unit is rectangular arrangement.

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