CN100543555C - Side illuminating source backlight module - Google Patents

Side illuminating source backlight module Download PDF

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Publication number
CN100543555C
CN100543555C CNB2006101566341A CN200610156634A CN100543555C CN 100543555 C CN100543555 C CN 100543555C CN B2006101566341 A CNB2006101566341 A CN B2006101566341A CN 200610156634 A CN200610156634 A CN 200610156634A CN 100543555 C CN100543555 C CN 100543555C
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CN
China
Prior art keywords
light
backlight module
illuminating source
guide plate
side illuminating
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Expired - Fee Related
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CNB2006101566341A
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Chinese (zh)
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CN101211062A (en
Inventor
吴泰峰
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Unisonic Technologies Co Ltd
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Unisonic Technologies Co Ltd
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Priority to CNB2006101566341A priority Critical patent/CN100543555C/en
Publication of CN101211062A publication Critical patent/CN101211062A/en
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Publication of CN100543555C publication Critical patent/CN100543555C/en
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Abstract

A kind of side illuminating source backlight module comprises a substrate, a light guide plate and a light sources.Light guide plate is arranged at the upper surface of substrate and has an incidence surface, and light sources is arranged on the substrate and is close to the incidence surface of light guide plate, and wherein, light sources comprises: a plurality of white light LEDs encapsulation, and described white light LEDs package group becomes blue led crystal grain and adds yellow fluorescent powder; The encapsulation of a plurality of red-light LEDs, described a plurality of red-light LEDs encapsulation are in order to be in harmonious proportion the red spectrum that this white light LEDs encapsulation is short of; And a chip for driving, described chip for driving also comprises a timing module and a storage unit, the built-in decline parameters relationship table of this storage unit.The present invention can improve the problem of the easy imbalance of white balance of known side illuminating source backlight module, according to the present invention, red spectrum causes the feint possibility of video picture colourity can to avoid white light LEDs in the known side illuminating source backlight module to encapsulate for want of, in addition, the present invention is further by adding timing module in chip for driving, to keep the consistance of light source module brightness.

Description

Side illuminating source backlight module
Technical field
The invention relates to a kind of sidelight source (Edge-type) backlight module, particularly about a kind of with red light-emitting diode (Light Emitting Diode, LED) side illuminating source backlight module of regulation and control white balance mechanism.
Background technology
Please refer to Figure 1A and Figure 1B, Figure 1A is a known side illuminating source backlight module side diagrammatic cross-section; Figure 1B is the light sources that shows among Figure 1A.Backlight module 10 comprises a base (back bezel) 12, one light guide plate 14, multi-layer optical membrane (not showing), a reflector plate 16 and a light sources 20.Light sources 20 comprises a circuit board 21, a light emitting diode (LED) 22.The function of backlight module 10 is to be used to provide a uniform surface light source to give a display panel (display panel), for example liquid crystal panel.
Among backlight module 10, base 12 has a substrate (substrate) 122, and has from the extended extension 124 of substrate 122 peripheral parts, can be in order to other element of installing or coating backlight module 10.
Light guide plate 14 is arranged on the substrate 122, and light sources 20 is arranged at the side of light guide plate 14, and this side is the incidence surface of light guide plate 14.Light enters light guide plate 14 by this side of light guide plate 14, and scattering is among light guide plate 14.Light guide plate 14 has specific optical design (optical pattern) usually, and for example the v-cut pattern can make scattering in light outgoing light guide plate more equably 14 wherein.Usually can be provided with multi-layer optical membrane on light guide plate 14, for example upper and lower diffusion sheet and upper and lower brightening piece are to strengthen the quality of the light that backlight module 10 provided.
In order to strengthen the light service efficiency of backlight module 10, reflector plate 16 or coating reflectorized material can be set usually at the inner face of base 12.If with reflector plate 16 is example, the reflector plate 16 that is arranged at extension 124 inner faces can be with so that the light incident light guide plate more efficiently of light sources 20 14, and the reflector plate 16 that is arranged at substrate 122 inner faces then can make light be applied to backlight module 10 more efficiently.
Among the light sources 20, light emitting diode 22 is the elements that mainly convert electric energy to luminous energy, and the main at present luminophor that often uses is white light LEDs; Required circuit when circuit board 21 then has operating light-emitting diodes (leds) 22 after the two completes respectively usually, is installed in light emitting diode 22 on the circuit board 21 again and finishes light sources 20, is beneficial to the assembling of backlight module 10.
In side illuminating source backlight module, the white light LEDs mode of production of main flow is for to add the resulting encapsulating structure of YAG fluorescent powder (555nm) with blue-ray LED crystal grain (430nm) at present.This mode is utilized blue light and the yellow light mix of lens principle with complementation, can obtain the white light of finding of naked eye.The luminescence efficiency of blue-light LED chip (301m/W) is splendid compared to other monocrystalline type led chip, and compared to RGB polymorphic chip, has the design of the loop of driving simple and easy again, the advantage that production cost is lower; Yet the red wave band of its spectrum extremely a little less than, can make to lack in the spectrum redly, when the red object of irradiation, can demonstrate the redness of inclined to one side yellow.And for LCD, the color that can make general performance go out is faint especially when danger signal, and overall color is distinct inadequately.
At the defective of above-mentioned White-light LED package structure, relevant dealer has also proposed some corresponding roads and has wished to solve the disappearance that lacks ruddiness.For example when making the white light LEDs encapsulation, in YAG fluorescent powder, add redness or fluorescent orange powder, to improve the problem of shortcoming red spectrum.
Yet, above-mentioned technical solution but very easily influences packaged white light LEDs serviceable life, different interpolation materials what can produce reaction with existing yellow fluorescent powder, on practice, find to have problems such as accessory substance generation and easy hydrolysis, further influence the term of life and the brightness of white light LEDs.
Except when producing the white light LEDs encapsulation, improveing, other dealer is also arranged in addition, in the process of assembling side illuminating source backlight module, improve in other element, for example Japanese Nichia is by processing on chromatic filter (color filter), to solve the problem of above-mentioned colour cast.Just lack the reinforcement of red spectrum after finishing the white light LEDs encapsulation, its advantage is can not influence the good luminous efficiency and the serviceable life thereof of white light LEDs encapsulation; Yet, on chromatic filter, process the rising of the loaded down with trivial details and cost that but causes whole side illuminating source backlight module technology.
Therefore, how to improve the red spectral shortcoming problem of known side illuminating source backlight module, and further avoid the loaded down with trivial details and cost of the technology of whole backlight module to rise, by current development essential.
Summary of the invention
Fundamental purpose of the present invention is to improve the white balance imbalance of known side illuminating source backlight module.
Another object of the present invention is to avoid side illuminating source backlight module to lack the problem of red light bands of a spectrum.
Another object of the present invention is to avoid the problem of side illuminating source backlight module because of causing service time brightness to descend.
The invention provides a kind of side illuminating source backlight module, comprise a substrate, a light guide plate and a light sources.Light guide plate is arranged at the upper surface of substrate and has an incidence surface, and light sources is arranged on the substrate and is close to the incidence surface of light guide plate, and wherein, light sources comprises: a plurality of white light LEDs encapsulation, and described white light LEDs package group becomes blue led crystal grain and adds yellow fluorescent powder; The encapsulation of a plurality of red-light LEDs, described a plurality of red-light LEDs encapsulation are in order to be in harmonious proportion the red spectrum that this white light LEDs encapsulation is short of; And a chip for driving, described chip for driving also comprises a timing module and a storage unit, the built-in decline parameters relationship table of this storage unit.Light sources further links a flexible circuit board, by the chip for driving on the flexible circuit board light sources is applied electric current and converts electrical energy into luminous energy, to reach luminous effect.
From the above mentioned, the present invention has improved the problem of the easy imbalance of white balance of known side illuminating source backlight module really, according to the present invention, white light LEDs in the known side illuminating source backlight module encapsulates for want of, and red spectrum causes the feint possibility of video picture colourity can avoid, in addition, the present invention is further by adding timing module in chip for driving, to keep the consistance of light source module brightness.
About the advantages and spirit of the present invention, and more detailed embodiment can be by following embodiment and appended graphic being further understood.
Description of drawings
In conjunction with appended icon, can understand the plurality of advantages of foregoing and the present invention by following detailed description easily, wherein:
Figure 1A is a known side illuminating source backlight module side diagrammatic cross-section;
Figure 1B shows the light sources among Figure 1A;
Fig. 2 A is the disclosed side illuminating source backlight module schematic top plan view of the present invention;
Fig. 2 B is the disclosed side illuminating source backlight module side of a present invention diagrammatic cross-section.
The main element symbol description:
10 backlight modules, 12 bases
122 substrates, 124 extensions
14 light guide plate, 16 reflector plates
20 light sources, 21 circuit boards
22 light emitting diodes, 3 backlight modules
31 substrates, 311 upper surfaces
32 light guide plate, 321 exiting surfaces
322 incidence surfaces, 33 light sources
331 white light LEDs encapsulate the encapsulation of 332 red-light LEDs
4 flexible circuit boards
Embodiment
Please refer to Fig. 2 A~Fig. 2 B, it is respectively disclosed side illuminating source backlight module schematic top plan view of the present invention and side diagrammatic cross-section.Backlight module 3 comprises a substrate 31, a light guide plate 32 and a light sources 33.Light guide plate 32 is the acryl flat board of a light-permeable, and its upper surface is an exiting surface 321, and its lower surface combines with substrate 31; One side surface of light guide plate 32 is an incidence surface 322.
Light sources 33 is arranged at substrate 31 upper surfaces 311 and is close to the incidence surface 322 of light guide plate 32; Light sources 33 further links a flexible circuit board 4, by the chip for driving on the flexible circuit board 4 (not illustrating) light sources 33 is applied electric current and converts electrical energy into luminous energy, to reach luminous effect.
The light that light sources 33 is sent is exported with auxiliary liquid crystal panel (not illustrating) display frame by the first light face 321 of light guide plate 32 through the scattering of light guide plate 32 after entering light guide plate 32.
Among one embodiment, light guide plate 32 is provided with multi-layer optical membrane (not illustrating), and multi-layer optical membrane can be diffusion sheet, upward brightening piece, diffusion sheet and brightening piece or its combination down down, can strengthen the light quality that whole backlight module 3 is provided.
Further specify, the light sources 33 of the disclosed side illuminating source backlight module of the present invention is made up of a plurality of white light LEDs encapsulation 331 and a plurality of red-light LED encapsulation 332, and in this embodiment, white light LEDs encapsulation 331 and red-light LED encapsulation 332 are interconnected.Wherein the blue led crystal grain that consists of of white light LEDs encapsulation 331 adds yellow fluorescent powder, described in background technology, it is splendid to add that with blue led crystal grain white light LEDs that yellow fluorescent powder is formed encapsulates its luminescence efficiency, yet the red wave band of its spectrum extremely a little less than, can make lack in the spectrum red, when the red object of irradiation, can demonstrate the redness of inclined to one side yellow.And for LCD, the color that can make general performance go out is faint especially when danger signal, and overall color is distinct inadequately.And that the light sources among the present invention encapsulates by a plurality of red-light LEDs is 332 interconnected in 331 of white light LEDs encapsulation, to be in harmonious proportion white light LEDs encapsulation 331 red spectrum that are short of, keeps the white balance of whole backlight module 3.The display panel in different size and different application field has different LED briliancy and brightness demand, this ratio do not limit the configuration number ratio of red-light LED encapsulation and white light LEDs encapsulation in an embodiment of the present invention, because should be can give adjustment because of the demand of different panels.
In one embodiment, the chip for driving on the flexible circuit version has more comprised timing module and storage unit, and wherein storage unit is a built-in decline parameters relationship table.Decline parameters relationship table is the relation table of light source service time to the reinforcement electric current, the service time by prior detecting and recording light source group 33 to the curve of decay brightness to produce this decline parameters relationship table.Chip for driving can initiatively be calculated the service time of light sources 33 by timing module, and is maintained at a predetermined luminance by decline parameters relationship table carries out specific size after specific service time electric current reinforcement to keep light sources 33.
In the prior art, no matter be to improve on the packaging technology of white light LEDs or in the backlight module assembling process, improveing, all have the problem of whole backlight module serviceable life of influence or raising production cost at other optical element.And the present invention is by the setting of single-chip red-light LED encapsulation 332, light sources 33 processing of need in technology, additionally not feeding in raw material, the treatment process that backlight module also need not added to be correlated with at existing blooming piece, only need under existing configuration, add the red-light LED encapsulation, in terminal this step that adds of the technology of backlight module packaging technology, successfully under the prerequisite that does not improve too much production cost, solved the problem of known white balance imbalance.
In sum, the present invention has improved the problem of the easy imbalance of white balance of known side illuminating source backlight module really, according to the present invention, white light LEDs in the known side illuminating source backlight module encapsulates for want of, and red spectrum causes the feint possibility of video picture colourity can avoid, in addition, the present invention is further by adding timing module in chip for driving, to keep the consistance of light source module brightness.
Though the present invention illustrates as above with preferred embodiments, so it is not only to terminate in the foregoing description in order to limit the present invention's spirit with the invention entity.To being familiar with this operator, when understanding and utilize other element or mode to produce identical effect easily.Therefore, the modification of being done in not breaking away from spirit of the present invention and scope all should comprise within the scope of the claims.

Claims (6)

1. side illuminating source backlight module comprises:
One substrate;
One light guide plate is arranged at the upper surface of described substrate, and this light guide plate has an incidence surface;
One light sources is arranged at described substrate and is close to the incidence surface of described light guide plate;
It is characterized in that described light sources comprises:
A plurality of white light LEDs encapsulation, described white light LEDs package group becomes blue led crystal grain and adds yellow fluorescent powder;
The encapsulation of a plurality of red-light LEDs, described a plurality of red-light LEDs encapsulation are in order to be in harmonious proportion the red spectrum that this white light LEDs encapsulation is short of; And
One chip for driving, described chip for driving also comprise a timing module and a storage unit, the built-in decline parameters relationship table of this storage unit.
2. side illuminating source backlight module as claimed in claim 1 is characterized in that, described decline parameters relationship table is the relation table of light source service time to the reinforcement electric current.
3. side illuminating source backlight module as claimed in claim 2 is characterized in that, described chip for driving is carried out the electric current reinforcement by described timing module and described decline parameters relationship table at special time and is maintained at a predetermined luminance to keep this light sources.
4. side illuminating source backlight module as claimed in claim 1 is characterized in that, also includes multi-layer optical membrane, is arranged at described light guide plate surface.
5. side illuminating source backlight module as claimed in claim 4 is characterized in that, described multi-layer optical membrane is to be selected from diffusion sheet, upward brightening piece, diffusion sheet, brightening piece or its combination down down.
6. side illuminating source backlight module as claimed in claim 4 is characterized in that, also comprises a reflector plate or a reflecting material, is arranged at the upper surface of described substrate.
CNB2006101566341A 2006-12-29 2006-12-29 Side illuminating source backlight module Expired - Fee Related CN100543555C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNB2006101566341A CN100543555C (en) 2006-12-29 2006-12-29 Side illuminating source backlight module

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNB2006101566341A CN100543555C (en) 2006-12-29 2006-12-29 Side illuminating source backlight module

Publications (2)

Publication Number Publication Date
CN101211062A CN101211062A (en) 2008-07-02
CN100543555C true CN100543555C (en) 2009-09-23

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101368687B (en) * 2008-10-13 2010-09-22 友达光电股份有限公司 Side light type backlight module and its operation method
TWI439768B (en) * 2011-06-27 2014-06-01 Au Optronics Corp Backlight module and method for manufacturing the same
CN109346016A (en) * 2018-11-29 2019-02-15 厦门天马微电子有限公司 Backing structure, the brightness adjusting method of backing structure and display device
CN110111744B (en) * 2019-04-08 2021-01-08 重庆惠科金渝光电科技有限公司 Driving method and driving system of display module and display device

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