CN100442121C - Lighting arrangement - Google Patents
Lighting arrangement Download PDFInfo
- Publication number
- CN100442121C CN100442121C CNB031484433A CN03148443A CN100442121C CN 100442121 C CN100442121 C CN 100442121C CN B031484433 A CNB031484433 A CN B031484433A CN 03148443 A CN03148443 A CN 03148443A CN 100442121 C CN100442121 C CN 100442121C
- Authority
- CN
- China
- Prior art keywords
- light diffusion
- diffusion part
- light
- lighting device
- conductive layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Liquid Crystal (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
The present invention relates to an illumination device which mainly comprises a reflection plate, a diffusion plate, a plurality of light diffusion pieces clamped between the reflection plate and the diffusion plate and a plurality of lamp pipes arranged in the light diffusion pieces, wherein each light diffusion piece is provided with one inner cavity and an outer surface. The lamp pipes are arranged in the inner cavities of the light diffusion pieces, and light rays emitted by the lamp pipes pass through the light diffusion pieces from the inner cavities and eject from the outer surfaces of the light diffusion pieces. Each light diffusion piece comprises a thin film and a plurality of light diffusion particles distributed in the thin film, wherein the refractive rate of the thin films are different from the refractive rate of the light diffusion particles. Thus, the light rays emitted by the lamp pipes are uniformly distributed on the surfaces of the diffusion plate.
Description
Technical field
The present invention relates to a kind of lighting device, particularly a kind of backlight liquid crystal display device that is used for.
Background technology
Generally speaking, LCD comprise a display panels (it has two substrates and a liquid crystal layer is located in therebetween) and a lighting device for example a back lighting device be located at after this display panels.Several back lighting devices are arranged at present, for example full run-down type and edge-lit type.Using the fundamental purpose of back lighting device is the surface that the light from light source is evenly distributed in this display panels.
General existing Staight downward type backlight device comprises several line source fluorescent tubes to be located between a reflecting plate and the diffuser plate, will arrive this diffuser plate by this baffle reflection from the light of this fluorescent tube, convert line source to area source thus.But because to the lightening requirement of LCD, spacing between fluorescent tube and diffuser plate or the reflecting plate is limited, therefore be difficult to convert line source to be enough to overlap each other fully area source, therefore having the subregion crosses situation bright and the subregion luminance shortage, is difficult to provide uniform backlight.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art and defective, a kind of lighting device is provided, in order to overcome or to reduce a difficult problem that meets with in the above-mentioned prior art at least.
For reaching above-mentioned purpose, according to lighting device of the present invention, it mainly comprises a reflecting plate, one diffuser plate, a plurality of light diffusion parts are located between this reflecting plate and this diffuser plate, this light diffusion part has an inner chamber and an outside surface, and a plurality of fluorescent tubes, wherein in the inner chamber of each light diffusion part a fluorescent tube is set respectively, and the light that this fluorescent tube sent passes through the outside surface ejaculation that this light spreads part and spreads part from this light from this inner chamber, wherein this light diffusion part comprises a film and a lot of light diffusion particles are distributed in this film, and the refractive index of this film is different with the refractive index of this light diffusion particle, and the light that this fluorescent tube is launched is dispersed in the diffuser plate surface thus.
According to one embodiment of the invention, this light diffusion part comprises a film and a lot of light diffusion particles are distributed in this film, and the refractive index of this film is different with the refractive index of this light diffusion particle, and the mean refractive index of this light diffusion part integral body is preferably greater than 1, and the light that this fluorescent tube is launched is dispersed in the surface of this diffuser plate thus.Preferably, this light diffusion part has a columned profile, and the bore of its inner chamber is slightly larger than the diameter of this fluorescent tube.The astigmatic characteristic that the present invention utilizes this light diffusion part to have will be scattered in by the light that fluorescent tube sends on the surface of this diffuser plate earlier, make that through the further disperse light of this diffuser plate the surface light emitting of this diffuser plate is more even again.
In addition, the present invention provides an embodiment in addition, on the outside surface of this light diffusion part, form one deck conductive layer, cover the electromagnetic wave that electric field produced that is located at the fluorescent tube in this light diffusion part inner chamber thus, to avoid interference signal near other electronic installations (for example this display panels) of this lighting device.This conductive layer is preferably with transparent material to be made.This conductive layer forms on the outside surface of this light diffusion part has the pattern of site or the pattern with contiguous network, and this conductive layer roughly can not hinder the light that fluorescent tube sends and penetrated by this light diffusion part outside surface thus.In addition, this conductive layer is preferably an earth terminal that is electrically connected at this lighting device.This lighting device can be used as the downward back electro-optical device of LCD.
Therefore, for reaching above-mentioned purpose, the present invention also provides a kind of LCD, and it comprises: a display panels; One direct-type backlight device is located at this display panels below, it is characterized in that this downward back electro-optical device comprises: a reflecting plate; One diffuser plate; A plurality of light diffusion parts are located between this reflecting plate and this diffuser plate, and wherein this light diffusion part has an inner chamber and an outside surface; And several fluorescent tubes, a fluorescent tube wherein respectively is set in each inner chamber, this light diffusion part comprises a film and a lot of light diffusion particles are distributed in this film, after wherein the light launched of this fluorescent tube sees through this light diffusion part and penetrates, will be dispersed in the surface of this diffuser plate.
Description of drawings
Fig. 1 is the three-dimensional exploded view of lighting device according to an embodiment of the invention;
Fig. 2 is the cut-open view of lighting device according to an embodiment of the invention;
The light that Fig. 3 launches from this fluorescent tube for the partial sectional view diagram of the lighting device of Fig. 2 spreads the path of part scattering via this light;
Fig. 4 is the sectional perspective skeleton view of lighting device according to an embodiment of the invention;
Fig. 5 is the sectional perspective skeleton view of lighting device according to another embodiment of the present invention;
Fig. 6 is the three-dimensional exploded view of liquid crystal indicator according to an embodiment of the invention.
Symbol description among the figure
100 lighting devices
102 reflecting plates, 104 diffuser plates
106 light diffusion part 106a inner chamber
106b outside surface 108 fluorescent tubes
110 shell 110a pedestals
114 smooth diffusion particle 116 conductive layers
The pattern of the pattern 116b contiguous network of 116a site
118 earth points
300 light
600 LCD, 602 display panels
604 printed circuit board (PCB)s, 606 printed circuit board (PCB)s
608 winding carrying encapsulation, 610 frameworks
Embodiment
Describe the specific embodiment of the present invention in detail below in conjunction with drawings and Examples.
Figure 1 shows that lighting device 100 according to first embodiment of the invention, it mainly comprises a reflecting plate 102, a diffuser plate 104, six light diffusion parts 106 and is located between this reflecting plate 102 and this diffusion part 104, and six roots of sensation elongate tubular fluorescent tube 108 is located at corresponding light respectively and is spread in the part 106.In more detail, this lighting device has a shell 110, and this shell 110 comprises a pedestal 110a and a housing 110b.This reflecting plate 102 is located at the top of this pedestal 110a, and this diffuser plate 104 then is to be sealed in this housing 110b top.This lighting device 100 can be used as the downward back electro-optical device of LCD.
In traditional lighting device, only has a diffuser plate 104.When lamp tube starting, the light that directly enters diffuser plate 104 will reflect the light that enters diffuser plate 104 with the plate 102 that is reflected to be mixed, and forms the surface light emitting (surface luminance) of this diffuser plate 104 thus.Yet the zone near more apart from fluorescent tube 108 on the diffuser plate 104 (especially fluorescent tube directly over) brightness is the strongest; Otherwise regional luminance far away more apart from fluorescent tube 108 on the diffuser plate 104 weak more (for example centre position of two adjacent fluorescent tubes) forms blanking bar easily, therefore often has the shortcoming of brightness irregularities.
With reference to Fig. 2, feature of the present invention promptly is to provide a plurality of light diffusion parts 106 with disperse light effect, and fluorescent tube 108 is located in this light diffusion part 106, the astigmatic characteristic of utilizing this light diffusion part 106 to have will be scattered on the surface of this diffuser plate 104 and reflecting plate 102 by the light that fluorescent tube 108 sends earlier, wherein reflecting plate 102 can reflex to its lip-deep light this diffuser plate 104 once again, light makes that through these diffuser plate 104 further disperse light the surface light emitting of this diffuser plate 104 is more even more then, improves the aura of this lighting device 100 thus and all spends (illumination uniformity) together.
In more detail, with reference to Fig. 3, this light diffusion part 106 has an inner chamber 106a and an outside surface 106b, and the light that this fluorescent tube 108 is sent is to pass through the outside surface 106b ejaculation that this light spreads part 106 and spreads part from this light from this inner chamber 106a.Preferably, this light diffusion part 106 has a columned profile, and the bore of its inner chamber 106a is slightly larger than the diameter of this fluorescent tube 108.This light diffusion part 106 can comprise a film 112 and a lot of light diffusion particles 114 are distributed in this film 112, and the refractive index of the refractive index of this film 112 and this light diffusion particle 114 is inequality.The particle diameter of this light diffusion particle is 0.00001mm to 0.1mm.The light that sends when fluorescent tube 108 because film 112 is different with light diffusion particle 114 refractive indexes, causes light scatter during by this light diffusion part 106, makes the light dispersion.In addition, the mean refractive index of these light diffusion part 106 integral body is preferably greater than 1.According to Snell ' s Law, when light from a first area (refractive index n
1) establish into a second area (refractive index n
2) time, the relational expression of its angle is n
1Sin θ
1=n
2Sin θ
2, θ wherein
1For the light of incident and first area and and the angle that intersects of the normal of the interface of second area, θ
2Be the light of outgoing (exit) and first area and and the angle that intersects of the normal of the interface of second area.When light was mapped to lower regional of refractive index from the higher zone of refractive index, the angle of beam projecting was bigger than the angle of incident, therefore helped to make light to disperse more.With reference to Fig. 3, light 300 is through after 114 scatterings of light diffusion particle, with various irregular angle (θ
1) penetrate this light diffusion part 106 and with angle θ
2Inject in the atmosphere, because the refractive index of light diffusion part is greater than 1, just greater than the refractive index of atmosphere, so outgoing θ
2Angle will be greater than the angle θ of incident
1, light is disperseed more.
When big more, the effect of disperse light is good more to the thickness of outside surface 106b on the inner chamber 106a surface of this light diffusion part 106, but this light diffusion part still can absorption portion light inevitably, so the too thick meeting of thickness descends the brightness of this lighting device 100.Preferably, in the scope of thickness between 1mm to 100mm of this light diffusion part 106.
Lighting device provided by the present invention can be used in the LCD, as shown in Figure 6.This LCD 600 comprises a display panels 602 (having a liquid crystal layer is arranged between a pair of upper and lower base plate) and is located at this display panels 602 belows in order to show image, a direct-type backlight device 100, in order to illuminate this display panels 602, and one framework 610 combine with this back lighting device 100, thus this liquid crystal panel 602 and this module 100 backlight are combined into this liquid crystal indicator 600.This display panels 602 comprises two printed circuit board (PCB)s (PCB) 604 and 606, in order to see through winding carrying encapsulation (Tape Carrier Package, TCP) 608, will control and drive signal is delivered to this display panels 602.According to one embodiment of the invention, the about 3mm of tube diameter of the downward back electro-optical device of one 16 cun LCD, the center of circle of this fluorescent tube and the vertical range of reflecting plate are 3.5mm, and the center of circle of this fluorescent tube and the vertical range of diffuser plate are 10.6mm, and the center of circle of two adjacent fluorescent tubes is at a distance of 27.
Because the fluorescent tube and the display panels of this lighting device are very close, the electromagnetic wave that electric field produced of this fluorescent tube is easy to disturb the normal signal on the display panels.Therefore, can not be provided with a conductive layer 116 on the outside surface of this light diffusion part 106 according to lighting device of the present invention, cover the electromagnetic wave that electric field produced that is located at the fluorescent tube 108 among this light diffusion part 106 inner chamber 106a thus, to avoid interference the signal of this display panels.In more detail, the electromagnetic wave that produces when fluorescent tube 108 passes light diffusion layer 106 and when desiring to inject atmosphere via this conductive layer, because light diffusion layer is different with the impedance of conductive layer boundary, makes electromagnetic projectile energy be reflected by conductive layer; And the energy that is not reflected by conductive layer can produce relaxation phenomenon during by conductive layer, and again can be different because of its impedance at the conductive layer and the intersection of atmosphere, and produces reflection once again.Preferably, this conductive materials is made by transparent material (for example indium tin oxide (ITO)).With reference to Fig. 4, this conductive layer 116 can form the pattern 116a with site on the outside surface 106b of this light diffusion part 106.Or with reference to Fig. 5, this conductive layer 116 can form the pattern 116b with contiguous network on the outside surface 106b of this light diffusion part 106, this conductive layer roughly can not hinder the light that fluorescent tube sends and penetrated by this light diffusion part outside surface in view of the above, and this conductive layer can avoid interference the signal of this display panels.In addition, this conductive layer 116 is preferably an earth point 118 that is electrically connected at this lighting device.
Though the present invention discloses with previous embodiment; right its is not in order to limiting the present invention, anyly has the knack of this operator, without departing from the spirit and scope of the present invention; when can doing various changes and modification, so protection scope of the present invention is as the criterion as the scope person of defining that look claims.
Claims (17)
1. lighting device is characterized in that it comprises:
One reflecting plate;
One diffuser plate;
A plurality of light diffusion parts are located between this reflecting plate and this diffuser plate, and wherein this light diffusion part has an inner chamber and an outside surface; And
Several fluorescent tubes wherein respectively are provided with a fluorescent tube in the inner chamber of each light diffusion part, and the light that this fluorescent tube sent penetrates by this light diffusion part and from the outside surface of this light diffusion part from this inner chamber,
Wherein this light diffusion part comprises a film and a lot of light diffusion particles are distributed in this film, and the refractive index of this film is different with the refractive index of this light diffusion particle, and the light that this fluorescent tube is launched is dispersed in the diffuser plate surface thus.
2. lighting device as claimed in claim 1 is characterized in that, the mean refractive index of this light diffusion part integral body is greater than 1.
3. lighting device as claimed in claim 1 is characterized in that, each light diffusion part also comprises a conductive layer around its outside surface setting.
4. lighting device as claimed in claim 3 is characterized in that this conductive layer is made with transparent material.
5. lighting device as claimed in claim 3 is characterized in that, this conductive layer forms the pattern with site on the outside surface of this light diffusion part.
6. lighting device as claimed in claim 3 is characterized in that, this conductive layer forms the pattern with contiguous network on the outside surface of this light diffusion part.
7. lighting device as claimed in claim 3 is characterized in that, this conductive layer is electrically connected at an earth terminal of this lighting device.
8. lighting device as claimed in claim 1 is characterized in that, the film of each light diffusion part is around the fluorescent tube setting.
9. LCD, it comprises:
One display panels;
One direct-type backlight device is located at this display panels below, it is characterized in that this downward back electro-optical device comprises:
One reflecting plate;
One diffuser plate;
A plurality of light diffusion parts are located between this reflecting plate and this diffuser plate, and wherein this light diffusion part has an inner chamber and an outside surface; And
Several fluorescent tubes, a fluorescent tube wherein respectively is set in each inner chamber, this light diffusion part comprises a film and a lot of light diffusion particles are distributed in this film, after wherein the light launched of this fluorescent tube sees through this light diffusion part and penetrates, will be dispersed in the surface of this diffuser plate.
10. LCD as claimed in claim 9 is characterized in that, the mean refractive index of this light diffusion part integral body is greater than 1.
11. LCD as claimed in claim 9 is characterized in that, the film of each light diffusion part is around the fluorescent tube setting.
12. LCD as claimed in claim 9 is characterized in that, this diffuser plate is parallel to this reflecting plate.
13. LCD as claimed in claim 9 is characterized in that, each light diffusion part also comprises a conductive layer around its outside surface setting.
14. LCD as claimed in claim 13 is characterized in that, this conductive layer is made with transparent material.
15. LCD as claimed in claim 13 is characterized in that, this conductive layer forms the pattern with site on the outside surface of this light diffusion part.
16. LCD as claimed in claim 13 is characterized in that, this conductive layer forms the pattern with contiguous network on the outside surface of this light diffusion part.
17. LCD as claimed in claim 13 is characterized in that, this conductive layer is electrically connected at an earth terminal of this lighting device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031484433A CN100442121C (en) | 2003-06-27 | 2003-06-27 | Lighting arrangement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031484433A CN100442121C (en) | 2003-06-27 | 2003-06-27 | Lighting arrangement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1567062A CN1567062A (en) | 2005-01-19 |
| CN100442121C true CN100442121C (en) | 2008-12-10 |
Family
ID=34472283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031484433A Expired - Fee Related CN100442121C (en) | 2003-06-27 | 2003-06-27 | Lighting arrangement |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100442121C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1971672B (en) * | 2005-11-22 | 2011-10-12 | 锐光照明系统（上海）有限公司 | Uniform light device of lamp tube |
| CN103268027B (en) * | 2012-07-20 | 2016-11-23 | 成都天马微电子有限公司 | The test device of a kind of TFT substrate and method of testing |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4998804A (en) * | 1988-08-29 | 1991-03-12 | Sharp Kabushiki Kaisha | Transmissive liquid crystal display device |
| US5333073A (en) * | 1992-01-09 | 1994-07-26 | Nec Corporation | Backlight device and liquid crystal display having conductive film on electromagnetic shield or diffuser between fluorescent tubes and display |
| CN1132558A (en) * | 1993-10-05 | 1996-10-02 | 梯尔技术公司 | Light source for back lighting |
| JP2000267096A (en) * | 1999-03-15 | 2000-09-29 | Matsushita Electric Ind Co Ltd | Back light device for liquid crystal display |
| CN1311863A (en) * | 1998-07-31 | 2001-09-05 | 日本化药株式会社 | Reflecting sheet and reflecting/semitransmitting sheet |
| CN1334482A (en) * | 2000-07-21 | 2002-02-06 | 明碁电通股份有限公司 | Back light board module |
-
2003
- 2003-06-27 CN CNB031484433A patent/CN100442121C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4998804A (en) * | 1988-08-29 | 1991-03-12 | Sharp Kabushiki Kaisha | Transmissive liquid crystal display device |
| US5333073A (en) * | 1992-01-09 | 1994-07-26 | Nec Corporation | Backlight device and liquid crystal display having conductive film on electromagnetic shield or diffuser between fluorescent tubes and display |
| CN1132558A (en) * | 1993-10-05 | 1996-10-02 | 梯尔技术公司 | Light source for back lighting |
| CN1311863A (en) * | 1998-07-31 | 2001-09-05 | 日本化药株式会社 | Reflecting sheet and reflecting/semitransmitting sheet |
| JP2000267096A (en) * | 1999-03-15 | 2000-09-29 | Matsushita Electric Ind Co Ltd | Back light device for liquid crystal display |
| CN1334482A (en) * | 2000-07-21 | 2002-02-06 | 明碁电通股份有限公司 | Back light board module |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1567062A (en) | 2005-01-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100559236C (en) | Light source, demonstration, terminal device, the method for light source cell and driving light source equipment | |
| US7039286B2 (en) | Light guide module having uniform light diffusion arrangement and method for making the same | |
| CN100429570C (en) | Plane light source device and display device provided with the same | |
| CN101514781A (en) | Back light unit | |
| CN2336378Y (en) | Uniform high-efficiency side-luminous backlight source | |
| JP2004206916A (en) | Planar light source | |
| CN102478178A (en) | Direct type ultrathin light emitting diode (LED) backlight module and display terminal | |
| CN101936489A (en) | Backlight module and optical assembly thereof | |
| CN101021648A (en) | Display panel and light source device used thereof | |
| TWI249053B (en) | Backlight module | |
| JP2007165064A (en) | Lighting system and display using the same | |
| US20130329456A1 (en) | Side-Edge Backlight Module | |
| CN201680225U (en) | Hybrid light-emitting component of LED backlight source | |
| CN115407551B (en) | Display device | |
| CN201954377U (en) | Direct illumination-type ultrathin LED backlight module and display terminal | |
| TW200532316A (en) | Backlight module of direct type point light source and liquid crystal display device using the same | |
| CN100442121C (en) | Lighting arrangement | |
| CN1297849C (en) | Light-emitting diode backlight module | |
| CN109358451B (en) | Backlight module and display device thereof | |
| CN2862099Y (en) | Ultra-thin light conducting LED back light source apparatus on electric appliances | |
| KR100977272B1 (en) | Light panel with light diffusion particles | |
| WO2022247941A1 (en) | Display device | |
| CN2613781Y (en) | Light reflection device | |
| CN112987394B (en) | Display device | |
| KR20080107163A (en) | Back-light unit for liquid crystal device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081210 Termination date: 20160627 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |