CN100357807C - Light guide plate for back light system - Google Patents
Light guide plate for back light system Download PDFInfo
- Publication number
- CN100357807C CN100357807C CNB021350558A CN02135055A CN100357807C CN 100357807 C CN100357807 C CN 100357807C CN B021350558 A CNB021350558 A CN B021350558A CN 02135055 A CN02135055 A CN 02135055A CN 100357807 C CN100357807 C CN 100357807C
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- CN
- China
- Prior art keywords
- guide plate
- site
- light guide
- back light
- light
- 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
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- Light Guides In General And Applications Therefor (AREA)
- Planar Illumination Modules (AREA)
Abstract
The present invention relates to a light guide plate used for a back light system, which comprises a rectangular flat plate and a plurality of lattice points, wherein the rectangular flat plate comprises two opposite light incident surfaces, a light emergent surface, a bottom surface and two opposite side surfaces; the lattice points are distributed on the bottom surface of the rectangular flat plate in row, and the whole bodies of the lattice points are in elliptical rings and extend outwards from the center of the light guide plate; the radiuses of the lattice points in the elliptical rings are approximately equal; the radiuses of the lattice points in the center are maximum, and the radiuses of the lattice points are gradually reduced towards circumference along the center of the light guide plate. The distribution of the lattice points with different sizes can enhance the light emergent brightness and the uniformity of a back light system of an LCD.
Description
[technical field]
The invention relates to the light guide plate that a kind of back light system is used, particularly about a kind of light guide plate of tool network point distribution.
[background technology]
Because the liquid crystal of panel of LCD itself is not had a characteristics of luminescence, thereby, for reaching display effect, need to give the LCD panel that one planar light source device is provided, as back light system, its function is area source abundant to panel of LCD supply briliancy and that be evenly distributed.
The back light system of prior art mainly is made up of light source, light guide plate, reflecting plate, diffuser plate and prism plate.This light source can be arranged at light guide plate one side or two opposite sides and with light emission to this light guide plate.The effect of this light guide plate is the transmission direction of direct light line, make light by the even outgoing of the exiting surface of light guide plate, the reflecting plate bottom surface of this light guide plate relatively is provided with, and being reflected into once more by the light of bottom surface of light guide plate outgoing in this light guide plate, improves the utilization factor of light.Diffuser plate sets gradually with the exiting surface of the relative light guide plate of prism plate, so that more even by the distribution of light of light guide plate outgoing, and then the briliancy and the homogeneity of raising panel of LCD.
According to the shape of light guide plate, it can be divided into uniform plate shaped light guide plate of thickness and wedge shape light guide plate.In addition, for increasing the light extraction efficiency and the homogeneity of light guide plate, the one side in light guide plate is provided with V-shaped groove or configuration site usually, and the distance that this V-shaped groove or site dispose on light guide plate has different designs with big I.When light transmission during to V-shaped groove or site, reflection and scattering will take place in light, and to each different directions transmission, finally the exiting surface by light guide plate penetrates.Utilize various densitys, the V-shaped groove that varies in size or site, can make light guide plate luminous evenly.
The prior art light guide plate of distribution site, a kind of bottom surface as shown in Figure 1, it is exposed in No. the 5th, 363,294, the United States Patent (USP) of on November 8th, 1994 bulletin.This patent discloses a planar light source device, and this planar light source device comprises that light source 2, that a tool incidence surface and the light guide plate 1, of exiting surface are arranged at this light guide plate 1 incidence surface side is arranged at the reflecting plate 5 that diffuser plate 6 that the reflector plate 4 of this light guide plate 1 end face, relative this light guide plate 1 exiting surface be provided with and this light guide plate 1 bottom surface relatively are provided with.Wherein, be the light that effectively utilizes light source 2 to be sent, it also is provided with a reflection lampshade 7 in these light source 2 places.In addition, for destroying light in the total reflection condition of light guide plate 1 internal transmission, this light guide plate 1 bottom surface is provided with a plurality of sites 3 that the ranks shape is arranged that are again.
Again as shown in Figure 2, it is the distribution schematic diagram of site 3 in this light guide plate 1 bottom surface.This site 3 forms a plurality of row along the direction with light source 2 axially parallels, and site 3 big or small identical in each row.This site 3 is along forming a plurality of row with the axially vertical directions of light source 2, and the varying in size of site 3 in each row, wherein, near site 3 minimums of light source 2, along with the increase of light source 2 distances, it is big that this site 3 also becomes gradually.Owing to the increase along with transmission range of the intensity of light source 2 emitted lights reduces, light guide plate 1 is posted reflector plate 4 (as shown in Figure 1) away from an end face of light source 2 in addition, 4 pairs of reflections that are projeced into its glazed thread of this reflector plate, causing this light guide plate 1 interior light intensity is not to reach minimum in the end away from light source 2, but reaches minimum in the segment distance place near this end.The size of this site 3 promptly in this light guide plate 1 the minimum place of light intensity reach maximum, and thereupon with constant size distribution to the end of this light guide plate 1 away from light source 2.
The outgoing light homogeneity of light guide plate 1 whole exiting surface can be improved to a certain extent in the distribution of this light guide plate 1 bottom surface in this site 3.But because this light guide plate 1 is except that its incidence surface and exiting surface have light discrepancy, other each face all need prevent the effusion of light.That is the two sides that link to each other with exiting surface with this light guide plate 1 incidence surface also are provided with reflector plate usually, and this reflector plate will cause the variation near the light intensity at this place, two sides to being projeced into the reflex of its glazed thread.And the distribution of site, the prior art light guide plate 1 bottom surface 3 is not considered it in the size variation that respectively lists, thereby is difficult to realize the even fully, consistent of whole light guide plate luminous exitance.
Because of being, improve the network point distribution of light guide plate, it is real in essential to improve its outgoing light homogeneity.
[summary of the invention]
The light guide plate that the object of the present invention is to provide the back light system of high briliancy of a kind of tool and uniformity coefficient to use.
For realizing the object of the invention, the light guide plate that back light system of the present invention is used comprises a rectangular flat and a plurality of site.This rectangular flat comprises two relative incidence surface, an exiting surface, the sides relative with two, a bottom surface.These a plurality of sites are bottom surface or the exiting surface that the ranks shape is distributed in this rectangular flat, these a plurality of sites are the outwards expansion of oval ring-type self-conductance tabula rasa middle part simultaneously, the radius of site about equally in each elliptical ring, wherein, the radius maximum of middle site, and the site radius is to reduce gradually around the mind-set in the light guide plate, and the radius size r of each site can be according to its place row, column number according to a function:
R=0.43+0.1[sin (0.14 π+0.01X
n)+sin (1.87 π+0.024Y
n)] wherein, the site at arbitrary end angle of the light guide plate of using with this back light system is first row, first row, X
nExpression place, site columns, Y
nExpression place, site line number.
Compared to prior art, the present invention has following advantage: the site of the light guide plate of using because of back light system of the present invention is the outwards expansion from large to small of oval ring-type self-conductance tabula rasa middle part, in its corresponding light guide plate light intensity be oval ring-type from the middle part by weak to strong abducent characteristic, and, just can realize the uniformity coefficient of the whole bright dipping of light guide plate that this back light system is used by the proportional relation that site size and light are derived intensity.
[description of drawings]
Fig. 1 is the side view of prior art planar light source device;
Fig. 2 is the distribution plan of the site of prior art planar light source device in bottom surface of light guide plate;
Fig. 3 is the synoptic diagram that light guide plate that back light system of the present invention is used cooperates with light source;
Fig. 4 is the network point distribution synoptic diagram of the light guide plate used of back light system of the present invention;
Fig. 5 is the side view of the light guide plate used of back light system of the present invention;
Fig. 6 is the side view of another embodiment of light guide plate of using of back light system of the present invention;
Fig. 7 is the distribute synoptic diagram of another embodiment of light guide plate mesh point that back light system of the present invention is used.
[embodiment]
As shown in Figure 3, the synoptic diagram that cooperates with light source of the light guide plate of using for back light system of the present invention 10.The light guide plate 10 that this back light system is used is a rectangular flat, and it comprises that two relative incidence surface 101 and 103, an exiting surface 108, bottom surfaces 109 (as shown in Figure 4) are oppositely arranged with bottom surface 109 with two relative sides 105 and 107, this exiting surface 108.
Wherein, this light source is at least two light tube assemblies, and two incidence surfaces 101 and 103 of the light guide plate 10 that it is used with back light system respectively are oppositely arranged, and this light tube assembly comprises an at least one fluorescent tube 20 and a lampshade (figure does not show) respectively.
The light guide plate 10 that this back light system is used is with transparent material, makes as acryl resin, polycarbonate, polyvinyl resin or glass etc.This two incidence surface 101 is mutually corresponding with 103 and be arranged in parallel, and it is in order to the light of acceptance from fluorescent tube 20, and it is imported in the light guide plate 10 that this back light system uses.This exiting surface 108 and bottom surface 109 are also corresponding mutually and be arranged in parallel, and it is all vertical with 103 with this two incidence surface 101, and wherein, this exiting surface 108 is in order to derive light the light guide plate 10 that this back light system is used.Two reflector plates 30 are attached at the two sides 105 and 107 of the light guide plate 10 that this back light system uses respectively, to prevent the two sides 105 and 107 outgoing of the light guide plate 10 that light is used from this back light system.In addition, also can adopt two reflectance coatings directly to be plated on the two sides 105 and 107 of the light guide plate 10 that this back light system uses.
Please cooperate again with reference to shown in Figure 4,, a plurality of sites 11 are set in its bottom surface 109 for improving the bright dipping briliancy and the homogeneity of the light guide plate 10 that this back light system uses.This site 11 can be printed or the mode of ejection formation is formed on the bottom surface 109 of the light guide plate 10 that this back light system uses.As shown in Figure 5, when making this site 11 with mode of printing, this site is cylindrical; When making the site with injection molding method, this site 11 is round spherical surface body shown in Figure 6, and certainly, this site 11 also can be cone or prunes most advanced and sophisticated taper platform.These a plurality of sites 11 are the bottom surface 109 that the ranks shape is distributed in the light guide plate 10 that this back light system uses, wherein, with proportional spacing multirow site 11 is set along direction (being denoted as X among the figure), along with proportional spacing multiple row site 11 being set with fluorescent tube 20 axial vertical directions (being denoted as Y among the figure) with fluorescent tube 20 axially parallels.Certainly, as shown in Figure 7, for further strengthening the effect of the 11 pairs of light in site, also can stagger half column distance respectively and be the alternating expression distribution in odd-numbered line parallel and adjacent with 103 with incidence surface 101 and even number line site 11.
The radius r of each site 11 can be according to its place row, column number according to a function: r=0.43+0.1[sin (0.14 π+0.01X
n)+sin (1.87 π+0.024Y
n)].
Wherein, the site of supposing the end angle, lower-left of the light guide plate of using with this back light system shown in Figure 4 10 is first row, first row; X
nExpression place, site columns, Y
nExpression place, site line number.The site at other arbitrary end angle of the light guide plate of certainly, can also this back light system using 10 is first row, first row.
The light guide plate 10 that back light system of the present invention is used does not have when site 11 is set in its bottom surface 109, light derivation intensity is partly the most weak with the centre in it, and around mind-set in the light guide plate, strengthen gradually, its overall distribution also is oval ring-type and outwards expands from the light guide plate middle part that back light system is used, the light of each elliptical ring correspondence is derived intensity about equally, and strengthens to the light guide plate 10 limit portions that back light system is used gradually.So, when the bottom surface 109 of the light guide plate of using in this back light system 10 is provided with the site 11 that distributes according to the present invention,, just can realize the uniformity coefficient of the light guide plate 10 whole bright dippings that this back light system is used owing to the proportional relations that site 11 sizes and light are derived intensity.
These a plurality of sites 11 can be arranged at the exiting surface 108 of the light guide plate 10 that back light system of the present invention uses equally.
Claims (9)
1. light guide plate that back light system is used, it comprises a rectangular flat and a plurality of site, this rectangular flat comprises two relative incidence surfaces again, one exiting surface, the side that one bottom surface is relative with two, this exiting surface and bottom surface also are oppositely arranged, these a plurality of sites are the bottom surface that the ranks shape is arranged at this rectangular flat, it is characterized in that: these a plurality of sites are to be the outwards expansion of oval ring-type self-conductance tabula rasa middle part, the radius of site about equally in each elliptical ring, wherein, the radius maximum of middle site, and the site radius is to reduce gradually around mind-set in the light guide plate, and the radius size r of each site can be expert at according to it, columns is according to a function:
R=0.43+0.1[sin (0.14 π+0.01X
n)+sin (1.87 π+0.024Y
n)], wherein, the site at arbitrary end angle of the light guide plate of using with this back light system is first row, first row, X
nExpression place, site columns, Y
nExpression place, site line number.
2. the light guide plate that back light system according to claim 1 is used is characterized in that: stagger half column distance respectively and are the alternating expression distribution in odd-numbered line parallel and adjacent with incidence surface and even number line site.
3. the light guide plate that back light system according to claim 1 is used is characterized in that: each row site and each row site are with the proportional spacing setting.
4. the light guide plate that back light system according to claim 1 is used is characterized in that: it further comprises two reflector plates, and this two reflector plate is attached at the two sides of the light guide plate that this back light system uses respectively.
5. the light guide plate that back light system according to claim 1 is used is characterized in that: it further comprises two reflectance coatings, and this two reflectance coating is plated on the two sides of the light guide plate that this back light system uses respectively.
6. the light guide plate that back light system according to claim 1 is used is characterized in that: this site is the bottom surface that is formed on this rectangular flat with mode of printing, and this site is cylindrical.
7. the light guide plate that back light system according to claim 1 is used is characterized in that: this site is the bottom surface that is formed on this rectangular flat with injection molding method, and this site is the circle spherical surface body.
8. the light guide plate that back light system according to claim 1 is used is characterized in that: this site is cone or taper platform.
9. the light guide plate of using according to the described back light system of arbitrary claim in the claim 1 to 8, it is characterized in that: a plurality of sites further are set on the exiting surface of this rectangular flat, and these a plurality of sites are identical with the site on this bottom surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021350558A CN100357807C (en) | 2002-10-24 | 2002-10-24 | Light guide plate for back light system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021350558A CN100357807C (en) | 2002-10-24 | 2002-10-24 | Light guide plate for back light system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1492264A CN1492264A (en) | 2004-04-28 |
| CN100357807C true CN100357807C (en) | 2007-12-26 |
Family
ID=34231435
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021350558A Expired - Fee Related CN100357807C (en) | 2002-10-24 | 2002-10-24 | Light guide plate for back light system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100357807C (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100529874C (en) | 2004-12-17 | 2009-08-19 | 鸿富锦精密工业（深圳）有限公司 | Light guide plate |
| CN100370283C (en) * | 2004-12-24 | 2008-02-20 | 鸿富锦精密工业（深圳）有限公司 | Guiding light plate |
| CN100376966C (en) * | 2004-12-29 | 2008-03-26 | 鸿富锦精密工业（深圳）有限公司 | Plate for guiding light |
| CN100483208C (en) * | 2005-07-06 | 2009-04-29 | 鸿富锦精密工业（深圳）有限公司 | Light-guiding board and back-light module using same |
| TWI579605B (en) * | 2015-01-06 | 2017-04-21 | 瑞儀光電股份有限公司 | Light guide element and light source using the same |
| CN104848090B (en) * | 2015-05-19 | 2017-05-10 | 欧浦登（福州）光学有限公司 | Sidelight type glass backlight plate and manufacturing technique |
| CN108627904B (en) * | 2017-03-17 | 2024-05-31 | 江苏日月照明电器有限公司 | Flat lamp light guide plate mesh point arrangement structure with high light yield |
| CN110308591B (en) * | 2019-07-31 | 2022-10-21 | 厦门天马微电子有限公司 | Backlight module and display device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5450292A (en) * | 1992-03-16 | 1995-09-12 | Enplas Corporation | Surface light source device |
| US5796450A (en) * | 1994-12-16 | 1998-08-18 | Canon Kabushiki Kaisha | Illumination device and liquid crystal display apparatus including same |
| CN2337633Y (en) * | 1997-06-28 | 1999-09-08 | 林金川 | Transparent film plate luminosity booster |
| JP2000137223A (en) * | 1998-11-02 | 2000-05-16 | Kyocera Corp | Liquid crystal display device |
-
2002
- 2002-10-24 CN CNB021350558A patent/CN100357807C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5450292A (en) * | 1992-03-16 | 1995-09-12 | Enplas Corporation | Surface light source device |
| US5796450A (en) * | 1994-12-16 | 1998-08-18 | Canon Kabushiki Kaisha | Illumination device and liquid crystal display apparatus including same |
| CN2337633Y (en) * | 1997-06-28 | 1999-09-08 | 林金川 | Transparent film plate luminosity booster |
| JP2000137223A (en) * | 1998-11-02 | 2000-05-16 | Kyocera Corp | Liquid crystal display device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1492264A (en) | 2004-04-28 |
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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 | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20040428 Assignee: Shenchao Photoelectric (Shenzhen) Co., Ltd. Assignor: Hung Fujin Precision Industry (Shenzhen) Co., Ltd.|Hon Hai Precision Industry Co Contract record no.: 2010990000078 Denomination of invention: Light guide plate for back light system Granted publication date: 20071226 License type: Exclusive License Record date: 20100220 |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20071226 Termination date: 20171024 |