CN1482497A - Plane light source device and liquid crystal display - Google Patents
Plane light source device and liquid crystal display Download PDFInfo
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- CN1482497A CN1482497A CNA02131652XA CN02131652A CN1482497A CN 1482497 A CN1482497 A CN 1482497A CN A02131652X A CNA02131652X A CN A02131652XA CN 02131652 A CN02131652 A CN 02131652A CN 1482497 A CN1482497 A CN 1482497A
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Abstract
A flat surface illuminating source device and LCD thereof, the device comprises at least one linear light source or point light source, a light guiding board, for defining a lower surface and an upper surface, and at least a recess under the lower surface, for accommodating at least one light source, and at least a pair of first leaning surface opposite the recess on the upper surface, and a reflector arranged on the lower surface of the light conducting board for covering the illuminating source. The LCD provided by the invention can improve brightness and lower the thickness of the plane luminous source apparatus.
Description
Technical field
The present invention relates to technical field of liquid crystal display, especially a kind of planar light source device and LCD.
Background technology
As shown in Figure 1, the structure of LCD (LCD) device is commonly used in its demonstration.Generally speaking, this LCD device comprises a panel of LCD 10, and it comprises and is provided with below and shell 11 and 12 that liquid crystal material, a module 20 backlight are disposed at this panel of LCD IO in the middle of the two substrates.
The light that this module 20 backlight is sent a light source is dispensed on the surface of this liquid crystal panel 10 uniformly.Being used for backlight liquid crystal display module 20 generally can be divided into: directly descend light source pattern and edge light pattern.
Please refer to Fig. 2, it shows a kind of down straight aphototropism mode set 21, along the cross section view of Fig. 1 section line 2-2.This down straight aphototropism mode set 21 comprises a shell 70, it has a reflector plate 60 and is disposed at its lower surface, and the fluorescent tube such as cold-cathode tube 50, be positioned at its bottom, a diffusion sheet 40 is positioned on this shell 70 and prismatic lens 30 is disposed on this diffusion sheet 40.Because these fluorescent tube 50 compartment of terrains are disposed in the viewing area of this panel of LCD 10, so the skewness of the illumination of this panel of LCD.Again, the on-off element of this liquid crystal panel 10 (switchingelement) also might damage because of the heat energy of this backlight.
Therefore, just need to exist a certain distance or interval in this fluorescent tube 50 and 40 of this diffusion sheets.This distance or interval generally provide by the support column 55 in this shell 20.Typically, the center of this fluorescent tube 50 to the distance of its shadow surface need be greater than half of this fluorescent tube spacing.Because these structural demands, just ten minutes is difficult to reduce the thickness of down straight aphototropism mode set 21.Moreover fluorescent tube 50 itself also can absorb the light that other fluorescent tubes radiate, and reduces the usefulness of optics.
Please refer to Fig. 3, it shows a kind of side type module 22 backlight, along the cross section view of Fig. 1 section line 2-2.This side type module 22 backlight comprises that a light guide plate 80, a fluorescent tube 50 are installed at least one side of this light guide plate 80 and a U-shaped reverberator 61 around this fluorescent tube 50.One opening portion of this reverberator 61 is fixed in the side of this light guide plate 80, and a reflector plate 60 is fixed in the bottom of this light guide plate 80, and a diffusion sheet 40 is fixed on this light guide plate 80, and prismatic lens 30 is fixed on this diffusion sheet 40.Because this fluorescent tube 50 is disposed at the edge of this light guide plate 80, so the thickness of this LCD just is minimized.
This light guide plate 80 has the point-like of a printing or the pattern of v-depression, is positioned on its at least one surface, and generally with the PMMA mold forming.This diffusion sheet 40 is disposed on this light guide plate 80, usually with translucent PET or polycarbonate (polycarbonate; PC), poly terephthalic acid diethylester plastic cement (PET) manufacturing, with so that the light that penetrates by this light guide plate homogenising more.This prismatic lens 30 is disposed on this diffusion sheet 40, and the light in order to this diffusion sheet 40 is emitted accumulates in heavy straight on the direction of this prismatic lens 30.
Because the illumination of this panel of LCD 10 provides by these light guide plate 80 emitted light, so this light guide plate 80 must illuminate this panel of LCD 10 uniformly.Yet especially under the situation of large-sized monitor, light guide plate often can not provide good homogeneous illumination.Moreover, light guide plate 80 and on the manufacturing cost of pattern very expensive.
For prior art backlight liquid crystal display module, have many effort and attempt to improve the brightness of LCD, uniform illumination is provided, reduces power consumption, reduces manufacturing cost, also reduces volume simultaneously.For example, such as 12 United States Patent (USP)s the 6th, 164 of giving Lee on the 26th in 2000, No. 790, nineteen ninety-five 12 No. the 5th, 477,422, United States Patent (USP) and 1 United States Patent (USP)s the 5th of giving people such as Ciupke on the 16th in 1996 of giving people such as Hooker on the 19th, 485, No. 354.Yet aforementioned patent and the module backlight that prior art provided still can't satisfy above-mentioned requirement for module backlight.
Now again with reference to 4a and 4b figure, it discloses the module backlight 23 of a kind of light emitting diode (LED) light source of prior art, along the cross section view of Fig. 1 section line 2-2.The module backlight 23 of this light emitting diode comprises that a light guide plate 80, a plurality of light emitting diode 51 are positioned at the dual-side of this light guide plate 80, reach bottom and side that reflector plate 60,62 is disposed at this module 23 backlight respectively.This LED backlight module 23 also can't satisfy the demand, particularly for large-sized LCD, can't provide uniform light more,, and only be positioned at the side of this module 23 backlight because this light emitting diode is for being substantially a pointolite but not line source.
In view of this, just having to provide a kind of module backlight, is used for LCD, can overcome aforesaid shortcoming.
Summary of the invention
The purpose of this invention is to provide a kind of planar light source device, it has uniform illumination, exquisite more and lower manufacturing cost.
Another object of the present invention provides a kind of backlight liquid crystal display module, and it has uniform illumination, exquisite more and lower manufacturing cost.
For reaching above-mentioned purpose, the invention provides a kind of planar light source device, comprising: at least one linear light source or point source of light; One light guide plate, define an a lower surface and a upper surface, and have at least one groove and be positioned at this lower surface, to be positioned at this upper surface corresponding with this groove in order to hold this at least one light source and at least one pair of first inclined surface, in order to this groove acting in conjunction, the light of the light source of at least one imports in this light guide plate with this; And a reverberator, be positioned at the lower surface of this light guide plate, and cover this light source.
The present invention also proposes a kind of LCD, comprises a panel of LCD, and an above-mentioned planar light source device.
Described before combining, this planar light source device can avoid fluorescent tube to shine the optical energy of being lost mutually, and increases brightness, and reduces the thickness of this planar light source device.Because the increase of this module brightness backlight,, not only reduce cost and make unlikely the dwindling in visual angle of this module backlight so can reduce the use of prismatic lens.Moreover according to planar light source device of the present invention, light source is embedded in this light guide plate, so can will hang down the size of module backlight.
Description of drawings
In order to allow above-mentioned and other purposes of the present invention, feature and the advantage can be more obvious, preferred embodiment of the present invention cited below particularly, and cooperate appended diagram, be described in detail below.
Fig. 1 is the volume rendering expansion synoptic diagram according to the LCD of prior art;
Fig. 2 is the diagrammatic cross-section according to the down straight aphototropism mode set of prior art;
Fig. 3 is the diagrammatic cross-section according to the side type module backlight of prior art;
Fig. 4 a is the last floor map according to the LED backlight module of prior art;
Fig. 4 b is the diagrammatic cross-section of this LED backlight module among Fig. 4 a;
Fig. 5 is the diagrammatic cross-section of LCD according to an embodiment of the invention;
The local amplification profile synoptic diagram of Fig. 6 module light guide plate backlight according to another embodiment of the present invention;
Fig. 7 is the size synoptic diagram of module light guide plate backlight according to an embodiment of the invention;
Fig. 8 a is the last floor map of LED backlight module according to still another embodiment of the invention;
Fig. 8 b is the diagrammatic cross-section of this LED backlight module among Fig. 8 a.
Embodiment
Please refer to Fig. 5, it shows according to LCD 100 of the present invention.This LCD 100 comprises a panel of LCD 110 and a module 120 backlight.This panel of LCD 110 has two transparency carriers 112,114, and liquid crystal material 116 is disposed at wherein.Have on-off element (switching element) on the transparency carrier 112,114 of this panel of LCD 110, produce image in order to the arrangement that changes liquid crystal molecule.
This module 120 backlight act as a planar light source device, is used in the whole viewing area, launches light uniformly and illuminates this panel of LCD 110.This module backlight comprises a plurality of linear light sources, such as the blooming of fluorescent tube 150, a light guide plate 180 and multilayer, such as diffusion sheet 140 and prismatic lens 130.This fluorescent tube 150 can be cold cathode ray tube (cold cathode fluorescentlamp; CCFL).
This light guide plate 180 has a plurality of grooves 210 and is positioned at its bottom, and in order to holding this fluorescent tube 150, and a plurality of otch 220 is positioned at its top.The position of this otch 220 is corresponding with the position of this groove 210, and the profile of this otch 220 and 210 actings in conjunction of this groove, so make to enter the light that this fluorescent tube 150 is launched in this light guide plate 180, and by total reflection (total internalreflection) in wherein the diffusion.So, can be by the light that this fluorescent tube 150 is launched via this light guide plate 180, the upper surface (exit facet) 226 by this light guide plate 180 penetrates uniformly, and illuminates this panel of LCD 110 uniformly.This module 120 backlight comprises four offside reflection plates 182 and a bottom reflecting plate 184 in addition.This offside reflection plate 182 be disposed at this light guide plate 180 around, reflect back in this light guide plate 180 in order to the light of the sidewall that will be incident upon this light guide plate 180.This bottom reflecting plate 184 is disposed at the lower surface of this light guide plate 180, in order to this light guide plate of light reflected back of the lower surface that will be incident upon this light guide plate 180.Again, this bottom reflecting plate 184 has a plurality of convex ridges 186 in addition, and configuration corresponds to this fluorescent tube 150 belows, and the light in order to further this fluorescent tube 150 is penetrated imports in this light guide plate 180.
This light guide plate 180 is generally with material transparent, such as acryl resin (Acrylic Resin; PMMA) manufacturing.This light guide plate 180 can be integrally formed, as shown in Figure 5.Yet according to another embodiment of the present invention, as shown in Figure 6, this light guide plate 180 also can be made up by a succession of modular intermeshing light guide 180 '.This light guide 180 ' has snap openings 192, and fastening bolt 190 is in order to meshing this snap openings 192, and forms this whole light guide plate 180.
Now please refer to Fig. 7, it shows the size according to this light guide plate 180 of the first embodiment of the present invention.With reference to figure 7, under critical conditions, the light of this fluorescent tube 150 (as shown in phantom in FIG.) the vertically surface level 212 of this groove 210 goes into to inject this light guide plate 180, when shining a pair of first inclined surface 222 of this otch 220, total reflection can take place, so this angle θ
1Should be greater than 2* (90-θ c), θ c is the critical angle of village's material of light guide plate, that is for acryl resin (Acrylic Resin; Refractive index (index of refraction)=1.49), critical angle θ c=42.9 degree, θ
1Should be greater than 94.2 degree.The width W of the surface level 212 of this groove 210
1Should equal the width W of these two first inclined surfaces 222 of this otch 220 substantially
2
According to preferred embodiment of the present invention, this groove 210 has a pair of inclined-plane 214 in addition, and this otch 220 has a pair of second inclined surface 224 in addition.The angle theta that the inclined-plane 214 of this groove 210 and surface level are 212
3And the angle theta that this second inclined surface 224 of this otch 220 and this upper surface of this light guide plate 180 are 226
2And, less than about 90 the degree.The width W of this second inclined surface 224 of this otch 220
3, greater than the height H of 226 of the upper surfaces of this fluorescent tube 150 and this light guide plate 180
1, and preferable greater than this height H
1Twice.
The width of this groove 210 (distances that this two vertical wall is 216) W
4Be slightly larger than this fluorescent tube 150 diameters, so that provide this fluorescent tube 150 enough heat-dissipating spaces, to reduce the possibility that the direct contact heat conduction reduces the blooming piece thermal deformation, on this gap typical case is 0.5mm.So this width W
4Add 1.0mm greater than fluorescent tube 150 diameters.The angle θ of this convex ridge 186
4Less than 180 degree.Height H between the lower surface of this fluorescent tube 150 and this light guide plate 180
2Greater than the height of this convex ridge 186, that is H
2＞tan (θ
4/ 2).According to geometry design of the present invention, this groove 210 can satisfy the requirement of total reflection (totalinterna1 reflection), and divergent light source, and avoids the generation of the bright band above the fluorescent tube.
Wherein, 224 of the upper surface 226 of this light guide plate 180 and this second inclined surfaces, and the joint of 222 of this second inclined surface 224 and this first inclined surfaces have fillet, form uneven illumination to avoid light in this joint.Yet 222 of this two first dip plane are sharp keen combination (not having chamfering or fillet), and the joint of 216 on the inclined-plane 214 of this groove 210 and this surface level 212 and this heavy straight wall also is sharp keen combining.
Now please refer to 8a and 8b, it shows the module backlight 520 of a third embodiment in accordance with the invention.This module 520 backlight is similar to this module 120 backlight substantially.This module 520 backlight has a light guide plate 580 and a plurality of point source of light, such as light emitting diode (LED) light source 550.This light guide plate 580 has a plurality of recesses 610 in order to holding this light source 550, and a plurality of recess 620 is corresponding with this recess 610.Being skillful in this skill person can understand, the profile of the section of this recess 510 and this recess 620, consistent with the profile of this groove 210 of this first embodiment and this otch 220, therefore as previously mentioned, the light that this light guide plate 580 can be launched this light source 550 imports in this light guide plate 580.Clearer and more definite, this recess 610 has the profile of truncated cone substantially, define a surface level 612, a truncated cone face 614 and a vertical wall 616, and this recess 620 defines one first circular conical surface 622 and one first circular conical surface 624.
For this led light source 550, this light source 550 is embedded in the recess 610 of this light guide plate 580, and scatters the emitted light of this light source 550 uniformly by this light guide plate 580.Therefore, module 520 backlight according to the present invention only need increase the quantity of this led light source 550, just can provide large-area planar light source, and be applicable to large-sized purposes.
Described before combining, according to module backlight of the present invention or planar light source, has a light guide plate, its part with depression is in order to hold linear light source (fluorescent tube) or point source of light (led light source), and otch can with this sunk part acting in conjunction, and the light that this light source is launched is imported in this light guide plate.
Because this light guide plate, this module backlight or planar light source can avoid fluorescent tube to shine the optical energy of being lost mutually, and increase brightness, and reduce the thickness of this module backlight.Because the increase of this module brightness backlight,, not only reduce cost and make unlikely the dwindling in visual angle of this module backlight so can reduce the use of prismatic lens.Moreover according to module backlight of the present invention, light source is embedded in this light guide plate, so can will hang down the size of module backlight.
Though the present invention discloses as above with preferred embodiment; right its is not in order to qualification the present invention, any those who are familiar with this art, without departing from the spirit and scope of the invention; when can doing a little change and retouching, so the present invention's protection domain is as the criterion when looking claims scope person of defining.
Claims (30)
1. planar light source device is characterized in that: comprising:
At least one linear light source;
One light guide plate, define an a lower surface and a upper surface, and have at least one groove and be positioned at this lower surface, to be positioned at this upper surface corresponding with this groove in order to hold this at least one light source and at least one pair of first inclined surface, in order to this groove acting in conjunction, the light of the light source of at least one imports in this light guide plate with this; And
One reverberator is positioned at the lower surface of this light guide plate, and covers this light source.
2. planar light source device as claimed in claim 1, it is characterized in that: this recess defining one surface level of this light guide plate is parallel to this lower surface and a pair of vertical wall perpendicular to this lower surface, and the width of this a pair of first inclined surface is more than or equal to the width of this surface level.
3. planar light source device as claimed in claim 1 is characterized in that: the critical angle of village's material of this light guide plate is θ c, and the angle that this a pair of first inclined surface is asked is greater than 2* (90-θ c).
4. planar light source device as claimed in claim 1, it is characterized in that: this recess defining one surface level of this light guide plate is parallel to this lower surface and a pair of vertical wall perpendicular to this lower surface, and has a pair of inclined-plane in addition, connect this vertical wall and this surface level, the light of using further this light source imports in this light guide plate.
5. planar light source device as claimed in claim 4 is characterized in that: this light guide plate has at least one pair of second inclined surface in addition, connects upper surface and this first inclined surface of this light guide plate.
6. planar light source device as claimed in claim 5, it is characterized in that: the angle between the upper surface of this of this light guide plate second inclined surface and this light guide plate, and the summation of this inclined-plane of this groove and the angle between this surface level, less than 90 degree, and the distance that should ask second inclined surface is greater than the distance of this light source center to the upper surface of this light guide plate.
7. planar light source device as claimed in claim 1, it is characterized in that: this reverberator has at least one convex ridge in addition, be positioned at the below of this groove of this light guide plate, with respect to this light source, this convex ridge defines two surfaces, the angle on this two surface is less than 180 degree, and stretches into this at least one the groove of this light guide plate.
8. planar light source device is characterized in that: comprising:
At least one point source of light;
One light guide plate, define an a lower surface and a upper surface, and have at least one recess and be positioned at this lower surface, in order to hold this at least one light source, and at least one first circular conical surface to be positioned at this upper surface corresponding with this recess, in order to this recess acting in conjunction, the light of the light source of at least one imports in this light guide plate with this; And
One reverberator is positioned at the lower surface of this light guide plate, and covers this light source.
9. planar light source device as claimed in claim 8 is characterized in that: this recess of this light guide plate defines a surface level and is parallel to this lower surface and a pair of vertical wall perpendicular to this lower surface, and the diameter of this first circular conical surface is more than or equal to the diameter of this surface level.
10. planar light source device as claimed in claim 8 is characterized in that: the critical angle of this light guide plate material is θ c, and the angle of this first circular conical surface is spent greater than 2* (90-θ c).
11. planar light source device as claimed in claim 8, it is characterized in that: this recess of this light guide plate defines a surface level and is parallel to this lower surface and a pair of vertical wall perpendicular to this lower surface, and has a truncated cone face in addition, connect this vertical wall and this surface level, nationality is further to import the light of this light source in this light guide plate.
12. planar light source device as claimed in claim 11 is characterized in that: this light guide plate has at least one second circular conical surface in addition, connects upper surface and this first circular conical surface of this light guide plate.
13. planar light source device as claimed in claim 12, it is characterized in that: the angle between the upper surface of this of this light guide plate second circular conical surface and this light guide plate, and the summation of this truncated cone face of this groove and the angle between this surface level, less than 90 degree, and should be to the diameter of second circular conical surface greater than the distance of this light source center to the upper surface of this light guide plate.
14. planar light source device as claimed in claim 8, it is characterized in that: this reverberator has at least one convex ridge in addition, he is in the below of this groove of this light guide plate, with respect to this light source, this convex ridge defines another circular conical surface, the angle of this circular conical surface is less than 180 degree, and stretches into this at least one the groove of this light guide plate.
15. a planar light source device is characterized in that: comprising:
At least one light source;
One light guide plate, define an a lower surface and a upper surface, and have at least one recess and be positioned at this lower surface, to be positioned at this upper surface corresponding with this groove in order to hold this light source and at least one first inclined surface, in order to this groove acting in conjunction, the light of this light source is imported in this light guide plate; And
One reverberator is positioned at the lower surface of this light guide plate, and covers this light source.
16. planar light source device as claimed in claim 15 is characterized in that: this recess of this light guide plate defines a surface level and is parallel to this lower surface, and this first inclined surface is being parallel to width on the direction of this upper surface more than or equal to the width of this surface level.
17. planar light source device as claimed in claim 15 is characterized in that: the critical angle of the village of this light guide plate material is θ c, and the angle that this first inclined surface is asked in this upper surface is less than θ c degree.
18. planar light source device as claimed in claim 15 is characterized in that: this recess of this light guide plate defines a surface level and is parallel to this lower surface, and has an inclined-plane in addition, is connected in this surface level, and the light of using further this light source imports in this light guide plate.
19. planar light source device as claimed in claim 18 is characterized in that: this light guide plate has at least one second inclined surface in addition, connects upper surface and this first inclined surface of this light guide plate.
20. planar light source device as claimed in claim 19, it is characterized in that: the angle between the upper surface of this of this light guide plate second inclined surface and this light guide plate, and the summation of this inclined-plane of this recess and this surface level angle of asking, less than 90 degree, and this second inclined surface is being parallel to width on the direction of this upper surface greater than the distance of this light source center to the upper surface of this light guide plate.
21. planar light source device as claimed in claim 15 is characterized in that: this reverberator has at least one convex ridge in addition, is positioned at the below of this groove of this light guide plate, with respect to this light source, and stretches in this at least one the groove of this light guide plate.
22. a LCD is characterized in that: comprising:
One panel of LCD; And
One module backlight in order to illuminate this panel of LCD, comprising:
At least one light source;
One light guide plate defines an a lower surface and a upper surface, and has at least one recess position
In this lower surface, in order to hold this light source and at least one first inclined surface he on this
The surface corresponding with this groove, in order to this groove acting in conjunction, the light of this light source is led
Go in this light guide plate; And
One reverberator is positioned at the lower surface of this light guide plate, and covers this fluorescent tube.
23. LCD as claimed in claim 22 is characterized in that: this light source of this module backlight is a linear light source.
24. LCD as claimed in claim 22 is characterized in that: this light source of this module backlight is a point-like light source.
25. LCD as claimed in claim 22 is characterized in that: this recess of this light guide plate defines a surface level and is parallel to this lower surface, and this first inclined surface is being parallel to width on the direction of this upper surface more than or equal to the width of this surface level.
26. LCD as claimed in claim 22 is characterized in that: the critical angle of the material of this light guide plate is θ c, and the angle of this first inclined surface between this upper surface is less than θ c degree.
27. LCD as claimed in claim 22, it is characterized in that: this recess of this light guide plate defines a surface level and is parallel to this lower surface, and the recess of this light guide plate defines a surface level and is parallel to this lower surface, and has an inclined-plane in addition, be connected in this surface level, the light of using further this light source imports in this light guide plate.
28. LCD as claimed in claim 27 is characterized in that: this light guide plate has at least one second inclined surface in addition, connects upper surface and this first inclined surface of this light guide plate.
29. LCD as claimed in claim 28, it is characterized in that: the angle between the upper surface of this of this light guide plate second inclined surface and this light guide plate, and the summation of this inclined-plane of this recess and the angle between this surface level, less than 90 degree, and this second inclined surface is being parallel to width on the direction of this upper surface greater than the distance of this light source center to the upper surface of this light guide plate.
30. LCD as claimed in claim 22 is characterized in that: this reverberator has at least one convex ridge in addition, is positioned at the below of this groove of this light guide plate, with respect to this light source, and stretches in this at least one the groove of this light guide plate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02131652 CN1227561C (en) | 2002-09-12 | 2002-09-12 | Plane light source device and liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02131652 CN1227561C (en) | 2002-09-12 | 2002-09-12 | Plane light source device and liquid crystal display |
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|---|---|
| CN1482497A true CN1482497A (en) | 2004-03-17 |
| CN1227561C CN1227561C (en) | 2005-11-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02131652 Expired - Fee Related CN1227561C (en) | 2002-09-12 | 2002-09-12 | Plane light source device and liquid crystal display |
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