CN100397201C - Backlight module group and liquid crystal display - Google Patents
Backlight module group and liquid crystal display Download PDFInfo
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- CN100397201C CN100397201C CNB200510102311XA CN200510102311A CN100397201C CN 100397201 C CN100397201 C CN 100397201C CN B200510102311X A CNB200510102311X A CN B200510102311XA CN 200510102311 A CN200510102311 A CN 200510102311A CN 100397201 C CN100397201 C CN 100397201C
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- sub
- module backlight
- grating
- metal framework
- wavelength
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- 239000004973 liquid crystal related substance Substances 0.000 title description 2
- 229910052751 metal Inorganic materials 0.000 claims abstract description 40
- 239000002184 metal Substances 0.000 claims abstract description 40
- 230000000737 periodic effect Effects 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 claims description 5
- 238000010276 construction Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 6
- 230000005855 radiation Effects 0.000 description 14
- 230000005457 Black-body radiation Effects 0.000 description 10
- 238000009792 diffusion process Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 3
- 229910001335 Galvanized steel Inorganic materials 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000003321 amplification Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000008397 galvanized steel Substances 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
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Abstract
The invention discloses a backlight module, comprising a metal frame, comprising a holding space whose corresponding surface to the holding space is provided with a microstructure, which is a sub-wavelength grating structure. And the invention also provides a LCD using the backlight module. And the LCD has better radiating effect.
Description
[technical field]
The invention relates to the LCD of a kind of module backlight and employing module backlight.
[background technology]
LCD is a kind of non-self-emission display apparatus, it shows generally passing through or the obstructed realization of coming by control light beam that light source sends, therefore need to adopt light source and corresponding guiding device usually, as module backlight, this module backlight can be with the beam direction display panel that light source sent.
Generally speaking in order to satisfy the requirement of high brightness and slimming, light source is generally many group fluorescent tubes in the module backlight, and be assembled in the narrow confined space, this light source heat radiation amount is higher during work, therefore the heat that is produced when operation can't distribute smoothly, long slightly when the running time, be easy to cause near the temperature of light source too high, thereby the element of module internal backlight caused harmful effect, produce contraction as blooming piece, light guide plate distortion or thawing, light source can produce the phenomenon of briliancy decline or color coordinate drift etc. at high temperature.
Seeing also Fig. 1, is the diagrammatic cross-section of a kind of prior art module backlight.Module 10 backlight comprises blast sheet 13 on a light source 11, the light guide plate 12,, once blast sheet 14, a diffusion sheet 15, a reflecting body 16 and a metal framework 17.This metal framework 17 be used to accommodate fix this reflecting body 16, light source 11, light guide plate 12, go up blast sheet 13, blast sheet 14 and diffusion sheet 15 down.
The incidence surface 122 that this light guide plate 12 comprises a light-emitting face 121, intersects with this light-emitting face 121.12 pairs of this light sources should be provided with by incidence surface 122.
This reflecting body 16 is accommodated the rectangular parallelepiped of cavity for tool one, this rectangular parallelepiped has an opening 161, this is accommodated and accommodates this light source 11 and light guide plate 12 in the cavity, this opening 161 is corresponding with the light-emitting face 121 of light guide plate 12, this reflecting body 16 is with the light-emitting face 121 of light source 11 and light guide plate 12 light leaks reflection to light guide plate 12, with the utilization factor of increase light, and then the brightness that improves module 10 backlight.Corresponding opening 161 is provided with this time blast sheet 14 in regular turn, goes up blast sheet 13 and diffusion sheet 15 on this reflecting body 16, and blast sheet 13, following blast sheet 14 and diffusion sheet 15 make the even scattering of light on this.
Because these flat metal framework 17 smooth surfaces, the easily a large amount of heat radiations of reflection from module backlight 10 inside, be unfavorable for dispelling the heat to the external world, therefore the heat that is produced when operation often can't distribute and constantly accumulation smoothly, make the temperature in the module 10 backlight constantly raise, thereby damage the element of module internal backlight, and then the normal operation of the LCD of this module 10 backlight is adopted in influence.
[summary of the invention]
For solving the relatively poor problem of above-mentioned module radiating effect backlight, be necessary the module backlight that provides a kind of radiating effect preferable.
And be necessary to provide a kind of LCD that adopts above-mentioned module backlight.
A kind of module backlight, it comprises a metal framework, and this metal framework comprises a receiving space, and this metal framework is provided with microstructure to inside surface that should receiving space, and this microstructure is the sub-wavelength grating structure.
A kind of LCD, it comprises a display panel and a module backlight, enter this display panel from the light of this module outgoing backlight, this module backlight comprises a metal framework, this metal framework comprises a receiving space, this metal framework is provided with microstructure to inside surface that should receiving space, and this microstructure is the sub-wavelength grating structure.
Compared with prior art, because the metal framework inside surface of fixing this other each element of module backlight that is used to accommodate of the present invention's module backlight is provided with the sub-wavelength grating structure, therefore can prevent that heat radiation from producing reflection and high order diffraction at metal framework, thereby the temperature that metal framework can be produced module internal heat radiation backlight is smoothly outwards distributed, therefore prevent the damage of module backlight and LCD inner member, and then ensure the normal operation of LCD.
[description of drawings]
Fig. 1 is the synoptic diagram of a kind of prior art module backlight.
Fig. 2 is the LCD first embodiment diagrammatic cross-section of the present invention.
Fig. 3 is the enlarged diagram of LCD area I II shown in Figure 2.
Fig. 4 is the part amplification profile schematic perspective view of LCD frame shown in Figure 2.
Fig. 5 to Fig. 9 is the cut-away section schematic perspective view of other distortion of microstructure shown in Figure 4.
[embodiment]
Seeing also Fig. 2, is the diagrammatic cross-section of LCD of the present invention.This LCD 2 comprises a display panel 30 and module backlight 20, enters this display panel 30 from the light of these module 20 outgoing backlight.
This module 20 backlight comprises blast sheet 23 on a light source 21, the light guide plate 22,, once blast sheet 24, a diffusion sheet 25, a reflecting body 26 and a metal framework 27.This framework 27 be used to accommodate fix this reflector plate 26, light source 21, light guide plate 22, go up blast sheet 23, blast sheet 24 and diffusion sheet 25 down.
The incidence surface 222 that this light guide plate 22 comprises a light-emitting face 221, intersects with this light-emitting face 221.22 pairs of this light sources should be provided with by incidence surface 222.
This reflecting body 26 is accommodated the rectangular parallelepiped of cavity for tool one, this rectangular parallelepiped has an opening 261, this is accommodated and accommodates this light source 21 and light guide plate 22 in the cavity, this opens 261 corresponding with the light-emitting face 221 of light guide plate 22, this reflecting body 26 is with the light-emitting face 221 of light source 21 and light guide plate 22 light leaks reflection to light guide plate 22, with the utilization factor of increase light, and then the brightness that improves module 20 backlight.Corresponding opening 261 is provided with this time blast sheet 24 in regular turn, goes up blast sheet 23 and diffusion sheet 25 on this reflecting body 26, and blast sheet 23, following blast sheet 24 and diffusion sheet 25 make the even scattering of light on this.
For heat radiation preferably, this metal framework 27 is made by the higher metal of heat-conduction coefficient, is stainless steel, galvanized steel plain sheet (SECC), hot-dip galvanized steel sheet (SGCC), aluminium, magnesium, copper, iron or its alloy of SUS430 as model.
Seeing also Fig. 3, is the enlarged diagram of LCD 2 area I II shown in Figure 2.The better heat radiation of absorption liquid crystal display 2 inside in order to reduce thermal-radiating reflection is provided with the microstructure 271 of a plurality of periodic distribution at the inside surface of this metal framework 27.Seeing also Fig. 4, is the part amplification profile schematic perspective view of metal framework 27.This microstructure 271 is an one dimension square-wave grating structure, and the Cycle Length of this one-dimensional grating structure is more little, and the radiating effect of this metal framework 27 is good more.
According to the one-dimensional grating equation
(θ
nBe n rank angle of diffraction, θ
iBe incident angle, λ is a radiation wavelength, and Λ is the grating cycle), the grating cycle of this microstructure 271 is arranged to less than the heat radiation wavelength that transfers to this metal framework 27, promptly one dimension sub-wavelength grating structure (Sub-wavelength Optical Element, SOE).Because θ
iAnd θ
nAngle is acute angle, so Sin θ
iWith Sin θ
nBe 0 to 1 certain numerical value, i.e. 0≤Sin θ
i≤ 1,0≤Sin θ
n≤ 1, and λ/Λ＞1 as mentioned above, therefore by the one-dimensional grating equation as can be known this microstructure 271 adopt one dimension sub-wavelength grating structures just can not produce diffraction more than or equal to single order, so can not produce high order diffraction on this metal framework 27.And, microstructure 271 is set is its inside surface on these metal framework 27 inside surfaces and be not shiny surface, it is also less therefore to produce thermal-radiating reflection.Therefore, microstructure 271 is arranged to one dimension sub-wavelength grating structure, can effectively promotes the radiating effect of this metal framework 27.
According to the blackbody radiation formula
[h=6.6256e
-34(JS); K=1.3805e
-23(J/K); V is that wavelength, T are that temperature, c are the light velocity, I
vBe emittance], can calculate the radiant quantity of learning each wavelength under the different temperatures, hence one can see that along with the emittance frequency spectrum that increases of temperature moves toward the short wavelength.
Be simplified design, can be according to Wien's displacement law (Wien ' s law) formula
Can calculate the highest wavelength of blackbody radiation intensity amount under the different temperatures.As shown in table 1,27 ℃ of the highest wavelength of following blackbody radiation intensity amount are that 17.019um, 60 ℃ of the highest wavelength of following blackbody radiation intensity amount are that 15.333um, 85 ℃ of the highest wavelength of following blackbody radiation intensity amount are that 14.262um, 95 ℃ of the highest wavelength of following blackbody radiation intensity amount are that 13.874um, 100 ℃ of the highest wavelength of following blackbody radiation intensity amount are that 13.688um, 120 ℃ of the highest wavelength of following blackbody radiation intensity amount are 12.992um etc.
The highest wavelength of blackbody radiation energy under table 1 different temperatures
As mentioned above, grating cycle of these microstructure 271 one dimension sub-wavelength grating structures is designed to less than 14.262um (promptly 85 ℃ time blackbody radiation energy the highest wavelength), as 13.874um or 13.688um, the high order diffraction that therefore can suppress 85 ℃ and the 85 ℃ main heat radiation wavelength of following temperature produces, thereby can effectively control LCD 2 temperature inside.
In addition, in order effectively to suppress these metal framework 27 inside surfaces, the ratio in the grating degree of depth/grating cycle can be controlled between 1～2.5 thermal-radiating reflection.Because the grating degree of depth is less than grating during the cycle, promptly the ratio in this grating degree of depth/grating cycle is relatively poor to the inhibition effect of thermal-radiating reflection less than 1 o'clock metal framework 27 inside surface, and the ratio in this grating degree of depth/grating cycle is the bigger the better in theory, but when the ratio in this grating degree of depth/grating cycle greater than 2.5 the time, because the intensity of optical grating construction and precision all can be restricted in present technology, therefore the grating degree of depth/grating periodic ratio are controlled between 1～2.5.Value between the ratio 1～2.5 in this grating degree of depth/grating cycle is generally also determined by employing optical grating construction pattern.
Near the temperature module 20 inner other parts temperature height more backlight general light source 21, so the microstructure 271 adjacent with light source 21 of this metal framework 27 can adopt other structure to regulate heat radiation to heat radiation.Or according to the heat radiation wavelength of light source 21 vicinity design grating cycle size, the grating cycle of promptly adjacent with light source 21 microstructure 271 is less than the grating cycle of the microstructure 271 of metal framework 27 other parts.
Compared to prior art, because metal framework 27 inside surfaces of fixing these LCD 2 each elements that are used to accommodate of LCD 2 of the present invention are provided with microstructure 271, and this microstructure 271 is cycle one dimension sub-wavelength grating structures less than 14.262um, the high order diffraction that therefore can suppress the main heat radiation wavelength of high temperature more than 85 ℃ and 85 ℃ produces, thereby can effectively control LCD 2 temperature inside.And the grating degree of depth/grating periodic ratio of this one dimension sub-wavelength grating structure is controlled between 1～2.5, therefore can effectively suppress these metal framework 27 inside surfaces to thermal-radiating reflection, thereby the temperature that metal framework 27 can be produced LCD 2 internal heat radiation is smoothly outwards distributed, therefore prevent the damage of LCD 2 inner members, and then ensure the normal operation of LCD 2.
Wherein, this plural number microstructure 271 also can have other distortion, but the grating cycle to be designed to less than 14.262um, the grating degree of depth/grating periodic ratio is controlled between 1～2.5, as shown in Figure 5, a plurality of microstructures 371 of this metal framework 37 can be designed to sinusoidal wave one dimension sub-wavelength grating structure; As shown in Figure 6, a plurality of microstructures 471 of this metal framework 47 also can be designed as triangular wave one dimension sub-wavelength grating structure.
Also as shown in Figure 7, a plurality of microstructures 571 of this metal framework 57 also can be designed as square two-dimentional sub-wavelength grating structure, and its grating cycle is designed to less than 14.262um equally, and the grating degree of depth/grating periodic ratio is controlled between 1～2.5; As shown in Figure 8, a plurality of microstructures 671 of this metal framework 67 also can be designed as the spherical depression points battle array of semicircle; As shown in Figure 9, a plurality of microstructures 771 of this metal framework 77 also can be designed as the spherical raised points battle array of semicircle, also can be designed as the two-dimentional sub-wavelength grating structure of other shape, as taper two dimension sub-wavelength grating structure or sinusoidal wave two-dimentional sub-wavelength grating structure or the like.
Claims (10)
1. module backlight, it comprises a metal framework, this metal framework comprises a receiving space, it is characterized in that: this metal framework is provided with microstructure to inside surface that should receiving space, and this microstructure is the sub-wavelength grating structure.
2. module backlight as claimed in claim 1 is characterized in that: this sub-wavelength grating structural cycle is below the 14.262um.
3. module backlight as claimed in claim 2 is characterized in that: this sub-wavelength grating structural cycle is 13.874um.
4. module backlight as claimed in claim 1, it is characterized in that: further comprise a light source, it is housed in the receiving space of this metal framework, and the grating cycle of the metal framework inside surface optical grating construction of this light source vicinity is less than the grating cycle of the optical grating construction of other parts.
5. module backlight as claimed in claim 1 is characterized in that: this sub-wavelength grating structure is an one dimension sub-wavelength grating structure.
6. module backlight as claimed in claim 5 is characterized in that: this one dimension sub-wavelength grating structure xsect is one of following shape: sine wave, triangular wave and square wave.
7. module backlight as claimed in claim 1 is characterized in that: this sub-wavelength grating structure is two-dimentional sub-wavelength grating structure.
8. module backlight as claimed in claim 7 is characterized in that: this two dimension sub-wavelength grating structure xsect is one of following shape: square salient point, the spherical salient point of semicircle and the spherical concave point of semicircle.
9. module backlight as claimed in claim 1 is characterized in that: the grating degree of depth/grating periodic ratio of this sub-wavelength grating structure is between 1～2.5.
10. LCD, it comprises a display panel and a module backlight, enters this display panel from the light of this module outgoing backlight, it is characterized in that: this module backlight is any described module backlight in the claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510102311XA CN100397201C (en) | 2005-12-09 | 2005-12-09 | Backlight module group and liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510102311XA CN100397201C (en) | 2005-12-09 | 2005-12-09 | Backlight module group and liquid crystal display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1979306A CN1979306A (en) | 2007-06-13 |
| CN100397201C true CN100397201C (en) | 2008-06-25 |
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ID=38130517
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200510102311XA Expired - Fee Related CN100397201C (en) | 2005-12-09 | 2005-12-09 | Backlight module group and liquid crystal display |
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| Country | Link |
|---|---|
| CN (1) | CN100397201C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102086993B (en) * | 2009-12-04 | 2013-05-29 | 群康科技(深圳)有限公司 | Backlight module and liquid crystal display device using same |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1124072A (en) * | 1997-07-01 | 1999-01-29 | Denso Corp | Liquid crystal display device |
| CN1567064A (en) * | 2003-07-04 | 2005-01-19 | 友达光电股份有限公司 | Backlight module |
| CN1617022A (en) * | 2003-10-28 | 2005-05-18 | 住友橡胶工业株式会社 | Direct type backlight device |
| CN1641436A (en) * | 2004-01-05 | 2005-07-20 | 鸿富锦精密工业（深圳）有限公司 | Straight-down backlight module |
-
2005
- 2005-12-09 CN CNB200510102311XA patent/CN100397201C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1124072A (en) * | 1997-07-01 | 1999-01-29 | Denso Corp | Liquid crystal display device |
| CN1567064A (en) * | 2003-07-04 | 2005-01-19 | 友达光电股份有限公司 | Backlight module |
| CN1617022A (en) * | 2003-10-28 | 2005-05-18 | 住友橡胶工业株式会社 | Direct type backlight device |
| CN1641436A (en) * | 2004-01-05 | 2005-07-20 | 鸿富锦精密工业（深圳）有限公司 | Straight-down backlight module |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1979306A (en) | 2007-06-13 |
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Granted publication date: 20080625 Termination date: 20161209 |