CN1645215A - Backlight module - Google Patents
Backlight module Download PDFInfo
- Publication number
- CN1645215A CN1645215A CNA2005100516196A CN200510051619A CN1645215A CN 1645215 A CN1645215 A CN 1645215A CN A2005100516196 A CNA2005100516196 A CN A2005100516196A CN 200510051619 A CN200510051619 A CN 200510051619A CN 1645215 A CN1645215 A CN 1645215A
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- Prior art keywords
- light
- optical thin
- backlight module
- guide device
- film layer
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Abstract
A back light module consists of a light source, a light element and an optical film layer. It features that optical film layer is set on light element surface as film refractivity is between refractivities of the light element and the air, the said light source launches a light to enter internal of light element through optical film layer.
Description
Technical field
The present invention relates to a kind of backlight module, particularly a kind of backlight module that promotes light source and light-guide device coupling efficiency between the two.
Background technology
At first see also Figure 1A, the figure shows the synoptic diagram of light source and light guide plate in the prior art side light type back light module.As shown in the figure, in a prior art side light type back light module, light source L (a for example light emitting diode) is arranged at the side of light-guide device G, but above-mentioned light source L incident ray uses forming an area source to light-guide device G inside.Yet,, so will cause part light to be reflected, and have a strong impact on light source L and light-guide device G coupling efficiency between the two by light-guide device G owing to have clearance S between light source L and the light-guide device G.
See also Figure 1B again, the figure shows the synoptic diagram of light source and light guide plate in the bottom-lighting type back light module.As shown in the figure, a light source L (a for example light emitting diode) is arranged at the below of light-guide device G, but and incident ray to light-guide device G inside.Similarly, owing to have clearance S between light source L and the light-guide device G, so will cause part light to be reflected and influence light source L and light-guide device G coupling efficiency between the two by light-guide device G.
Therefore in view of the shortcoming of aforementioned backlight module, how to reduce the light reflection, and then promote light source and light-guide device coupling efficiency between the two becomes an important problem.
Summary of the invention
The invention provides a kind of backlight module, comprise a light source, a light-guide device and an optical thin film layer.Above-mentioned optical thin film layer is laid in the light-guide device surface, and wherein the refractive index N of optical thin film layer is between the refractive index N of light-guide device
sAnd the refractive index N of air
0Between.Above-mentioned light source sends a light and passes optical thin film layer and enter light-guide device inside.
In a preferred embodiment, foregoing optical thin film layer comprises a plurality of optical thin films, and the refractive index of at least one in above-mentioned these optical thin films is between the refractive index N of light-guide device
sAnd the refractive index N of air
0Between.
In a preferred embodiment, the refractive index of aforementioned optical thin film layer is N=(N
0* N
s)
0.5
In a preferred embodiment, foregoing optical thin film layer is laid in the light-guide device surface in the mode of vacuum coating.
In a preferred embodiment, foregoing optical thin film layer is laid in the light-guide device surface in the mode that attaches.
In a preferred embodiment, foregoing optical thin film layer is magnesium fluoride (MgF
2) material.
In a preferred embodiment, foregoing backlight module is a side light type back light module (side-edge type backlight).
In a preferred embodiment, foregoing backlight module is bottom-lighting type back light module (directtype backlight).
In a preferred embodiment, aforementioned light source is a light emitting diode.
In a preferred embodiment, aforementioned light-guide device be the polymethylmethacrylate material (Polymethyl-methacrylate, PMMA).
In a preferred embodiment, aforementioned light-guide device has a depressed part, and aforementioned light source is arranged in the depressed part, aforementioned optical thin film layer then between aforementioned light-guide device and light source,
Description of drawings
For above-mentioned and other purpose of the present invention, feature and advantage can be become apparent, concrete preferred embodiment cited below particularly, and conjunction with figs. elaborates.
Figure 1A is the synoptic diagram of expression one prior art side light type back light module;
Figure 1B is the synoptic diagram of expression one prior art direct type backlight module;
Fig. 2 is the synoptic diagram of side light type back light module among expression the present invention;
Fig. 3 is the synoptic diagram of direct type backlight module among expression the present invention;
Fig. 4 be expression when the refractive index N=1.22 of optical thin film layer, the corresponding different wave length (synoptic diagram of 380～780nm) coupling efficiency of light source with light-guide device; And
Fig. 5 represents when the material of optical thin film layer is magnesium fluoride (N=1.38) the corresponding different wave length (synoptic diagram of 380～780nm) coupling efficiency with light-guide device of light source.
Description of reference numerals
The L light source
The G light-guide device
The S clearance
The C depressed part
The T optical thin film layer
The R reflecting plate
D partly penetrates film
Embodiment
At first see also Fig. 2, this figure shows side light type back light module synoptic diagram of the present invention.As shown in the figure, a plurality of light source L are embedded at the depressed part D that is positioned at light-guide device G both sides, wherein are laid with optical thin film layer T respectively on the surface of each depressed part D.In present embodiment, aforementioned light source L is light emitting diode (LED), and optical thin film layer T is then between light source L and light-guide device G.Above-mentioned optical thin film layer T can utilize the mode of vacuum coating or attaching to be formed at depressed part D surface, can promote light source L and light-guide device G coupling efficiency between the two by this.
The invention is characterized in: the refractive index N of aforementioned optical thin film layer T is between the refractive index Ns of light-guide device G and the refractive index N of air
0Between, wherein aforementioned optical thin film layer T can adopt magnesium fluoride (MgF
2) material (refractive index of magnesium fluoride is 1.38), owing to need passing optical thin film layer T after light source L emission, light enters light-guide device G, therefore the light reflection can be reduced by optical thin film layer T is set, the light transmittance that is incident upon light-guide device G inside can be added to simultaneously.
Then see also Fig. 3, the present invention also can be applicable among the bottom-lighting type back light module.As shown in the figure, a plurality of light source L (for example light emitting diode) are embedded at respectively in the depressed part C of light-guide device G below, and wherein optical thin film layer T then is laid in the surface of depressed part D in the mode of vacuum coating or attaching.As previously mentioned, the light that is sent owing to each light source L mainly passes optical thin film layer T and enters light-guide device G (as shown by arrows), and wherein the refractive index N of optical thin film layer T is then between the refractive index Ns of light-guide device G and the refractive index N of air
0Between, so can promote light source L and light-guide device G coupling efficiency between the two.In present embodiment, below light source L, be provided with a reflecting plate R in addition, in order to light reflection and guiding upwards, this external light-guide device G top more is provided with half and penetrates film D (Semi-transparent Film), can promote the homogeneity of backlight module overall brightness and briliancy by partly penetrating film D.
As previously mentioned, the refractive index N of optical thin film layer T is between the refractive index Ns of light-guide device G and the refractive index N of air
0Between.For example, suppose the refractive index N of air
0=1, and the material of light-guide device G if with the polymethylmethacrylate material (Polymethyl-methacrylate PMMA) be example, its refractive index Ns=1.49, at this moment the refractive index N of optical thin film layer T then must be between 1 to 1.49 (1＜N＜1.49).
Then see also Fig. 4, the figure shows subject to the foregoing, make the refractive index N=(N of optical thin film layer T
0* N
s)
0.5=1.22 o'clock, light source L and the corresponding different wave length of the light-guide device G (synoptic diagram of 380～780nm) coupling efficiency.As shown in Figure 4, when the refractive index of optical thin film layer T is 1.22, at the visible light wave range of wavelength greater than 580nm, light source L and light-guide device G coupling efficiency between the two can significantly be promoted to more than 99% by 96% original (when optical thin film layer T is not set).
See also Fig. 5 again, the figure shows when using magnesium fluoride (MgF
2) (MgF during as the material of optical thin film layer T
2Refractive index be 1.38), (synoptic diagram of 380～780nm) coupling efficiency, the thickness of wherein above-mentioned optical thin film layer T are the odd-multiple of a wavelength of four minutes to light source L with the corresponding different wave length of light-guide device G.As shown in the figure, the effect that when optical thin film layer T adopts the magnesium fluoride material, still has the coupling efficiency that promotes light source L and light-guide device G, wherein at visible light wave range 380～780nm, its average coupling efficiency still can be promoted to 97.7% by 96% original (when optical thin film layer T is not set).
Yet, aforementioned optical thin film layer T also can be a multi-layer film structure, it can be formed with vacuum coating or in the mode that attaches by a plurality of optical thin films, and the refractive index of at least one in the wherein aforementioned optical thin film must be between the refractive index Ns of light-guide device G and the refractive index N of air
0Between, can suitably promote light source L and light-guide device G coupling efficiency between the two by this.
For example, in order further to promote the coupling efficiency of short wavelength's part, when containing the optical thin film of magnesium fluoride material (refractive index is 1.38) among the optical thin film layer T, can plate refractive index in addition and form above-mentioned multi-layer film structure greater than 1.5 optical thin film, can promote thus and reinforcement at the coupling efficiency of short wavelength's part.
In sum, backlight module of the present invention sees through on the light-guide device surface and lays an optical thin film layer, can avoid the light reflection by this, can promote light source and light-guide device coupling efficiency between the two effectively simultaneously.
Though the present invention is with preferred embodiment openly as above, yet.It is not in order to limit the present invention; those skilled in the art under the premise without departing from the spirit and scope of the present invention, still can do some change and retouching; therefore, the scope that should an appended claims be defined of protection scope of the present invention is as the criterion.
Claims (20)
1. backlight module comprises:
One light-guide device;
One optical thin film layer is laid in described light-guide device surface, and the refractive index N of wherein said optical thin film layer is between the refractive index N of described light-guide device
sAnd the refractive index N of air
0Between; And
One light source sends a light and passes described optical thin film layer and enter described light-guide device inside.
2. the backlight module of stating as claim 1, the refractive index of wherein said optical thin film layer is:
N＝(N
0×N
s)
0.5。
3. the backlight module of stating as claim 1, wherein said optical thin film layer is laid in described light-guide device surface in the mode of vacuum coating.
4. the backlight module of stating as claim 1, wherein said optical thin film layer is laid in described light-guide device surface in the mode that attaches.
5. the backlight module of stating as claim 1, wherein said optical thin film layer is magnesium fluoride (MgF
2) material.
6. the backlight module of stating as claim 1, wherein said backlight module is a side light type back light module.
7. the backlight module of stating as claim 1, wherein said backlight module is a bottom-lighting type back light module.
8. the backlight module of stating as claim 1, wherein said light source is a light emitting diode.
9. the backlight module of stating as claim 1, wherein said light-guide device is the polymethylmethacrylate material.
10. the backlight module of stating as claim 1, wherein said optical thin film layer comprises a plurality of optical thin films, the refractive index of at least one in described these optical thin films is between the refractive index N of described light-guide device
sAnd the refractive index N of described air
0Between.
11. a backlight module comprises:
One light-guide device has a depressed part;
One light source is arranged in the described depressed part; And
One optical thin film layer is arranged between described light-guide device and the described light source, and the refractive index N of wherein said optical thin film layer is between the refractive index N of described light-guide device
sAnd the refractive index N of air
0Between.
12. as the backlight module that claim 11 is stated, the refractive index of wherein said optical thin film layer is:
N＝(N
0×N
s)
0.5。
13. as the backlight module that claim 11 is stated, wherein said optical thin film layer is laid in described light-guide device surface in the mode of vacuum coating.
14. as the backlight module that claim 11 is stated, wherein said optical thin film layer is laid in described light-guide device surface in the mode that attaches.
15. as the backlight module that claim 11 is stated, wherein said optical thin film layer is magnesium fluoride (MgF
2) material.
16. as the backlight module that claim 11 is stated, wherein said backlight module is a side light type back light module.
17. as the backlight module that claim 11 is stated, wherein said backlight module is a bottom-lighting type back light module.
18. as the backlight module that claim 11 is stated, wherein said light source is a light emitting diode.
19. as the backlight module that claim 11 is stated, wherein said light-guide device is the polymethylmethacrylate material.
20. as the backlight module that claim 11 is stated, wherein said optical thin film layer comprises a plurality of optical thin films, the refractive index of at least one in described these optical thin films is between the refractive index N of described light-guide device
sAnd the refractive index N of described air
0Between.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100516196A CN100353239C (en) | 2005-02-08 | 2005-02-08 | Backlight module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100516196A CN100353239C (en) | 2005-02-08 | 2005-02-08 | Backlight module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1645215A true CN1645215A (en) | 2005-07-27 |
| CN100353239C CN100353239C (en) | 2007-12-05 |
Family
ID=34876606
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100516196A Expired - Fee Related CN100353239C (en) | 2005-02-08 | 2005-02-08 | Backlight module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100353239C (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100385273C (en) * | 2006-12-01 | 2008-04-30 | 友达光电股份有限公司 | Liquid crystal display device, back light modular and light guide structure |
| CN102401281A (en) * | 2010-09-10 | 2012-04-04 | 三星电子株式会社 | Light-guide module |
| CN102890365A (en) * | 2012-10-22 | 2013-01-23 | 华南理工大学 | Direct-downward type LED (Liquid Crystal Display) liquid crystal module |
| CN103018959A (en) * | 2012-12-26 | 2013-04-03 | 深圳市华星光电技术有限公司 | Liquid crystal display module |
| WO2013075348A1 (en) * | 2011-11-25 | 2013-05-30 | 深圳市华星光电技术有限公司 | Backlight module and liquid crystal display |
| CN103492793A (en) * | 2011-04-26 | 2014-01-01 | 康宁股份有限公司 | Systems and methods for coupling light into a transparent sheet |
| US8970807B2 (en) | 2011-11-25 | 2015-03-03 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Backlight module and liquid crystal display |
| CN107390433A (en) * | 2017-09-20 | 2017-11-24 | 南京第五十五所技术开发有限公司 | Modularization line laser quantum dot backlight module device and display device |
| CN110828645A (en) * | 2018-08-10 | 2020-02-21 | 青岛海信电器股份有限公司 | Light-emitting element, backlight module and display device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1504767A (en) * | 2002-11-29 | 2004-06-16 | 鸿富锦精密工业（深圳）有限公司 | Light guide plate and light source system employing the same |
| CN1570720A (en) * | 2003-07-23 | 2005-01-26 | 鸿富锦精密工业（深圳）有限公司 | Backlight source device and liquid crystal display |
-
2005
- 2005-02-08 CN CNB2005100516196A patent/CN100353239C/en not_active Expired - Fee Related
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100385273C (en) * | 2006-12-01 | 2008-04-30 | 友达光电股份有限公司 | Liquid crystal display device, back light modular and light guide structure |
| CN102401281A (en) * | 2010-09-10 | 2012-04-04 | 三星电子株式会社 | Light-guide module |
| CN103492793B (en) * | 2011-04-26 | 2016-09-28 | 康宁股份有限公司 | Couple light into the system and method for lamella lucida |
| CN103620457B (en) * | 2011-04-26 | 2017-04-05 | 康宁股份有限公司 | Using the optical coupling optical system and method for light diffusion optical fiber |
| TWI554796B (en) * | 2011-04-26 | 2016-10-21 | 康寧公司 | Systems and methods for coupling light into a transparent sheet |
| CN103492793A (en) * | 2011-04-26 | 2014-01-01 | 康宁股份有限公司 | Systems and methods for coupling light into a transparent sheet |
| CN103620457A (en) * | 2011-04-26 | 2014-03-05 | 康宁股份有限公司 | Light-coupling optical systems and methods employing light-diffusing optical fiber |
| WO2013075348A1 (en) * | 2011-11-25 | 2013-05-30 | 深圳市华星光电技术有限公司 | Backlight module and liquid crystal display |
| US8970807B2 (en) | 2011-11-25 | 2015-03-03 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Backlight module and liquid crystal display |
| CN102890365A (en) * | 2012-10-22 | 2013-01-23 | 华南理工大学 | Direct-downward type LED (Liquid Crystal Display) liquid crystal module |
| CN103018959B (en) * | 2012-12-26 | 2015-12-02 | 深圳市华星光电技术有限公司 | A kind of liquid crystal module |
| WO2014101305A1 (en) * | 2012-12-26 | 2014-07-03 | 深圳市华星光电技术有限公司 | Liquid crystal module |
| CN103018959A (en) * | 2012-12-26 | 2013-04-03 | 深圳市华星光电技术有限公司 | Liquid crystal display module |
| CN107390433A (en) * | 2017-09-20 | 2017-11-24 | 南京第五十五所技术开发有限公司 | Modularization line laser quantum dot backlight module device and display device |
| CN110828645A (en) * | 2018-08-10 | 2020-02-21 | 青岛海信电器股份有限公司 | Light-emitting element, backlight module and display device |
| CN110828645B (en) * | 2018-08-10 | 2021-11-23 | 海信视像科技股份有限公司 | Light-emitting element, backlight module and display device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100353239C (en) | 2007-12-05 |
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Granted publication date: 20071205 Termination date: 20210208 |