CN100575988C - Light diffusion element, backlight module and LCD - Google Patents
Light diffusion element, backlight module and LCD Download PDFInfo
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- CN100575988C CN100575988C CN200810110114A CN200810110114A CN100575988C CN 100575988 C CN100575988 C CN 100575988C CN 200810110114 A CN200810110114 A CN 200810110114A CN 200810110114 A CN200810110114 A CN 200810110114A CN 100575988 C CN100575988 C CN 100575988C
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Abstract
The invention provides a kind of light diffusion element, backlight module and LCD, this light diffusion element has an incidence surface and an exiting surface.Have at least one light scattering pattern on the exiting surface, wherein the track of light scattering pattern is a continuous curve.Continuous curve is reeled in regular turn on exiting surface and is formed a plurality of closed figures, and two adjacent closed figures are overlapped.The present invention makes when light diffusion element collocation light source uses by making at least one light scattering pattern on light diffusion element, can provide evenly and the higher bright dipping of briliancy.Therefore, adopt the backlight module of above-mentioned light diffusion element can reduce the usage quantity of blooming piece to save cost and reduction package thickness.Similarly, LCD adopts above-mentioned backlight module can improve display quality, saves cost of manufacture, also can meet compact purpose of design.
Description
Technical field
The invention relates to the technology and the application of a kind of optical element and light source module, and particularly relevant for a kind of light diffusion element, backlight module and LCD.
Background technology
(liquid crystal display LCD) has thin thickness, high image quality, low consumpting power, advantage such as radiationless to LCD, and becomes the main flow of flat-panel screens (Flat Display Apparatus) gradually.Generally speaking, LCD is made of backlight module and display panels.Because display panels is non-emissive type panel, therefore need backlight module provide a uniform surface light source to display panels with show image.
In general, provide uniform surface light source, can use several pieces diffuser plates to be diffused as uniform surface light source usually with the point or the line source that will be disposed in the backlight module in order to make backlight module.In addition, significantly reduce the briliancy of area source for fear of using diffuser plate, also can dispose brightness enhancement film more usually between diffuser plate, to improve the integral brightness of area source.
Yet, in the prior art, diffuser plate is normally with surface roughening or add diffusion particle in diffuser plate or make the rough surface of diffuser plate outside the pale of civilization, and the above-mentioned diffusion particle mode of arranging in pairs or groups simultaneously evenly is scattered in the area source of panel will be disposed at light source in the backlight module.Yet, the light type that the neither easy formation of aforesaid way is comparatively concentrated and cause the briliancy deficiency of the area source that backlight module provides, thereby need to add blooming piece such as brightness enhancement film and improve the bright dipping quality, but also improved the production cost of making backlight module relatively.
Summary of the invention
In view of this, the invention provides a kind of light diffusion element, this light diffusion element collocation light source uses, and bright dipping briliancy uniformly can be provided.
The present invention provides a kind of backlight module in addition, and it adopts above-mentioned light diffusion element, thereby can provide and go out light effect more uniformly, and then reduces the usage quantity of blooming piece, to reach the purpose of saving cost, reduction package thickness.
The present invention more provides a kind of LCD, and it adopts above-mentioned backlight module, with raising display quality, reduction cost of manufacture, and can meet compact design requirement.
The present invention proposes a kind of light diffusion element, and this light diffusion element has an incidence surface and an exiting surface.Have at least one light scattering pattern on the exiting surface, wherein the track of light scattering pattern is a continuous curve.This continuous curve is reeled in regular turn on exiting surface and is formed a plurality of closed figures, and two adjacent closed figures are overlapped.
The present invention proposes a kind of backlight module in addition, and this backlight module comprises a light diffusion element and a light source.Light diffusion element has an incidence surface and an exiting surface.Have at least one light scattering pattern on the exiting surface, wherein the track of light scattering pattern is a continuous curve.This continuous curve is reeled in regular turn on exiting surface and is formed a plurality of closed figures, and two adjacent closed figures are overlapped.In addition, light source provides a light to enter light diffusion element by incidence surface, and light is by the exiting surface outgoing of light diffusion element.
The present invention proposes a kind of LCD in addition, and this LCD comprises a backlight module and a display panels.Backlight module comprises a light diffusion element and a light source.Light diffusion element has an incidence surface and an exiting surface.Have at least one light scattering pattern on the exiting surface, wherein the track of light scattering pattern is a continuous curve.This continuous curve is reeled in regular turn on exiting surface and is formed a plurality of closed figures, and two adjacent closed figures are overlapped.In addition, light source provides a light to enter light diffusion element by incidence surface, and light is by the exiting surface outgoing of light diffusion element.Display panels is disposed at by the exiting surface of light diffusion element.
In one embodiment of this invention, the light scattering pattern is the ditch that protrudes from the rib of exiting surface or be depressed in exiting surface.
In one embodiment of this invention, closed figure is arranged in regular turn along a direction, and all more previous closed figure of each closed figure this side up the skew one fixed range D.
In one embodiment of this invention, the breadth extreme of each closed figure in its orientation is W, and D＜W.
In one embodiment of this invention, W/D is an integer.
In one embodiment of this invention, 20 μ m≤W≤2000 μ m.
In one embodiment of this invention, at least one light scattering pattern is a plurality of light scattering patterns side by side, and the spacing of adjacent two light scattering patterns is d, and 0 μ m＜d≤100 μ m.
In one embodiment of this invention, backlight module also comprises an optical diaphragm group.Blooming piece is disposed at by the exiting surface.
In one embodiment of this invention, display panels more comprises an optics matrix group.Optics matrix configuration set is between light diffusion element and display panels.
In sum, the present invention makes when light diffusion element collocation light source uses by making at least one light scattering pattern on light diffusion element, can provide evenly and the higher bright dipping of briliancy.Therefore, adopt the backlight module of above-mentioned light diffusion element can reduce the usage quantity of blooming piece to save cost and reduction package thickness.Similarly, LCD adopts above-mentioned backlight module can improve display quality, saves cost of manufacture, also can meet compact purpose of design.
Description of drawings
Figure 1A illustrates the local top view of the light diffusion element of one embodiment of the invention.
Figure 1B is the diagrammatic cross-section of the light diffusion element that illustrated along the AA ' hatching line of Figure 1A.
Fig. 1 C is the diagrammatic cross-section of the light diffusion element that illustrated along the BB ' hatching line of Figure 1A.
Fig. 2 illustrates the synoptic diagram into cutter.
Fig. 3 A～Fig. 3 C illustrates the different diagrammatic cross-section of implementing the backlight module of kenel of the present invention respectively.
Fig. 4 illustrates the block schematic diagram into the LCD of one embodiment of the invention.
Drawing reference numeral:
100: light diffusion element
110: incidence surface
112: the light scattering pattern
112a: continuous curve
120: exiting surface
122: closed figure
122a: direction
130: cutter
132: point of a knife
200a, 200b, 200c, 310: backlight module
210: light source
212: light
220: diffuser plate
220 ': following diffuser plate
230: go up diffuser plate
240: brightness enhancement film
300: LCD
320: display panels
AA ', BB ': hatching line
D: spacing
D: fixed range
P1: class grain of rice shape district
P2: pyramid-like shape district
W: breadth extreme
Embodiment
For above-mentioned feature and advantage of the present invention can be become apparent, embodiment cited below particularly, and cooperate appended graphicly, be described in detail below.
Figure 1A illustrates the local top view of the light diffusion element of one embodiment of the invention, and Figure 1B is the diagrammatic cross-section of the light diffusion element that illustrated along the AA ' hatching line of Figure 1A, and the diagrammatic cross-section of the light diffusion element that Fig. 1 C is illustrated for the BB ' hatching line along Figure 1A.Please also refer to Figure 1A, Figure 1B and Fig. 1 C, the light diffusion element 100 of present embodiment has an incidence surface 110 and an exiting surface 120.Has at least one light scattering pattern 112 on the exiting surface 120.
In the present embodiment, the track of light scattering pattern 112 is a continuous curve 112a, and the cutter 130 that the mode that therefore forms light scattering pattern 112 for example is to use Fig. 2 and is illustrated is along this continuous curve rule and portray substrate constantly, until finishing required pattern.It should be noted that, above-mentioned method for making only is a usefulness for example, in other embodiments, also can use cutter 130 that light scattering pattern 112 is carved on mould (not illustrating), utilize the mode of ejection formation or other transfer printings again, with 112 transcriptions of light scattering pattern to substrate.
Because light scattering pattern 112 can use the required substrate of cutter 130 direct engraving to form, or use the mode of above-mentioned transcription and form light scattering pattern 112 on substrate.Therefore, light scattering pattern 112 is according to the difference of above-mentioned generation type, and it can be to protrude or the structure of depression, that is is that light scattering pattern 112 can be the ditch that protrudes from the rib of exiting surface 120 or be depressed in exiting surface 120.
In addition, the travel path partly portrayed of the solid line that Figure 1A illustrated for the point of a knife 132 of cutter 130.From Figure 1A as can be known, this travel path is the portrayal of clockwise direction coiling, certainly implement in the kenel at other, it can also be the portrayal of counterclockwise coiling, or and the coiling portrayal mode of combination, and its figure of reeling portrayal is a similar circle, can also be the ellipse or the figure of other shapes certainly, Figure 1A only is one for example, and is non-in order to limit the present invention.In other words, the continuous curve 112a that is portrayed out by cutter 130 reels in regular turn on exiting surface 120 and forms a plurality of closed figures 122, and two adjacent closed figures 122 overlap, and illustrates as Figure 1A.
In the present embodiment, the closed figure 122 of being reeled by continuous curve 112a is for to arrange in regular turn along a direction 122a, and all more previous closed figure 122 of each closed figure 122 is offset a fixed range D on this direction 122a, illustrates as Figure 1A.In addition, the breadth extreme of each closed figure 122 on this direction 112a is W, wherein 20 μ m≤W≤2000 μ m, preferably 20 μ m≤W≤500 μ m, and the fixed range D of adjacent two closed figures 122 illustrates as Figure 1A less than the breadth extreme W of closed figure 122.
Specifically, because the portrayal track of cutter 130 such as above-mentioned mode, make light scattering pattern 112 can be divided into the pattern of class grain of rice shape district (rice-like area) P1 and pyramid-like shape district (pyramid-like area) P2, wherein when the breadth extreme W of closed figure 122 is the integral multiple of fixed range D of adjacent two closed figures 122, can form above-mentioned complete grain of rice shape structure and pyramid structure, illustrate as Figure 1A.
In addition, light scattering pattern 112 can be by the machined parameters of cutter 130, can design the combination of the fixed range D of the breadth extreme W of multiple closed figure 122 and adjacent two closed figures 122, produce the variation combination of external form curved surface and the area proportion of several inhomogeneity pyramids district P2 and class grain of rice shape district P1, so that multiple scattered-light type to be provided, and applicable to the design of different backlight modules.
What deserves to be mentioned is, so the breadth extreme W scope of the standard closed figure 122 of present embodiment is because consider the cutter 130 actual restrictions that add man-hour.Furthermore, when the breadth extreme W of closed figure 122 exceeds the preferred range of institute's standard, for example be subject to processing the volume restrictions that board drives the shift motion of cutter 130 or cutter 130 itself, add trade union with 130 pairs of substrates of cutter and produce difficulty on implementing.Certainly, if use other processing modes (for example being little processing mode of semiconductor fabrication process photolithography techniques or laser carved technology and so on) when forming light scattering pattern 112, just be not limited thereto.
Please continue with reference to Figure 1A, in the present embodiment, the light scattering pattern 112 of light diffusion element 100 is a plurality of light scattering patterns 112 side by side, and the spacing of adjacent two light scattering patterns 112 is d, wherein 0 μ m＜d≤100 μ m, preferably 0 μ m＜d≤50 μ m.The pattern of above-mentioned a plurality of light scattering patterns 112 side by side can be mutually the same, or symmetrical each other, or different each other.That is to say that each light scattering pattern 112 side by side can be to reel clockwise or be that counterclockwise reels.Certainly, in the embodiment that other do not illustrate, light diffusion element 100 also can be the light diffusion element that only has a light scattering pattern 112.
What deserves to be mentioned is that if the spacing d of adjacent two light scattering patterns 112 is more little, then represent the density of per unit area light scattering pattern on exiting surface 120 high more, just, the microstructure area proportion that is formed on the exiting surface 120 is high more.Therefore, light is entered by the incidence surface 110 of light diffusion element 100, and when being penetrated by exiting surface 120, the effect of light scattering is good more.In addition, if the breadth extreme W of closed figure 122 is when to be the integral multiple of fixed range D of adjacent two closed figures 122 big more, in the same manner, the representative microstructure that equal area produced on exiting surface 120 is more intensive, at this moment, light diffusion element 100 similarly can provide light comparatively uniformly.In other words, the class grain of rice shape district P1 of the light scattering pattern 112 on exiting surface 120 and the external form curved-surface structure of pyramid-like shape district P2 and microstructure area proportion, except providing the uniform light, can also make light comparatively concentrated because of the relation of curved-surface structure, and then improve the briliancy of bright dipping.
In the embodiment that other do not illustrate, light diffusion element 100 also can revolve the design variation that turn 90 degrees with the multiple backlight module of correspondence with above-mentioned light scattering pattern 112.
In addition, what deserves to be explained is, because the point of a knife 132 of cutter 130 is sharp-pointed shape, therefore illustrate as Fig. 2, when engraving, can make the microstructure of light scattering pattern 112, the crest line of the tip of for example aforesaid pyramid-like shape district P2 and class grain of rice shape district P1, comparatively sharp-pointed, illustrate as Figure 1B.Yet the mode of the transcription of ejection formation and so on forms light scattering pattern 112 if see through as the aforementioned, can painstakingly reduce the transcription rate of pattern, makes the tip of pyramid-like shape district P2 and the crest line of class grain of rice shape district P1 become the curved surface with slick and sly angle.
Fig. 3 A～Fig. 3 C illustrates the diagrammatic cross-section of the backlight module of one embodiment of the invention respectively.Please refer to Fig. 3 A, the backlight module 200a of present embodiment adopts above-mentioned a light diffusion element 100 and a light source 210, wherein about the explanation of light diffusion element 100 as mentioned above, does not repeat them here.Light source 210 provides a light 212 to enter light diffusion element 100 by the incidence surface 110 of light diffusion element 100, and light 212 is by exiting surface 120 outgoing of light diffusion element 100.
Below will illustrate the backlight module 200a and the backlight module that uses the classic flat-plate diffuser plate, the two difference on the bright dipping briliancy of the light diffusion element 100 that adopts the foregoing description.
For light source comparatively uniformly is provided, backlight module also comprises a slice diffuser plate usually except using dull and stereotyped diffuser plate.Therefore, backlight module 200a more comprises a diffuser plate 220, illustrates as Fig. 3 A.
As shown in Table 1, under identical test condition, known backlight module adopts dull and stereotyped diffuser plate to add the kenel of a slice diffuser plate, and the briliancy ratio that it produced is 134%.At this moment, if dull and stereotyped diffuser plate is replaced into the formed backlight module 200a in above-mentioned light diffusion element 100 backs, it is 154% that the briliancy ratio that it produced then promotes.In other words, use light diffusion element 100 can promote the performance of backlight module 200a in the bright dipping briliancy in backlight module 200a.
Table one
| Optical element | The briliancy ratio |
| Dull and |
100％ |
| Dull and stereotyped diffuser plate+diffuser plate * 1 | 134％ |
| Light diffusion element+diffuser plate * 1 | 154％ |
Implement in the kenel at another, similarly, in order to produce more uniform light source, known backlight module can also comprise two diffuser plates except using dull and stereotyped diffuser plate.Therefore, backlight module 200b also comprises two diffuser plates 220, illustrates as Fig. 3 B.
In the same manner, under identical test condition, known backlight module adopts dull and stereotyped diffuser plate to add the kenel of two diffuser plates, and the briliancy ratio that it produced is 152%, as shown in Table 2.At this moment, if dull and stereotyped diffuser plate is replaced into the formed backlight module 200b in above-mentioned light diffusion element 100 backs, it is 164% that the briliancy ratio that it produced then promotes, as shown in Table 2.In other words, use light diffusion element 100 to replace the use of dull and stereotyped diffuser plate, can promote the performance of backlight module 200b in the bright dipping briliancy.
Table two
| Optical element | The briliancy ratio |
| Dull and |
100％ |
| Dull and stereotyped diffuser plate+diffuser plate * 2 | 152％ |
| Light diffusion element+diffuser plate * 2 | 164％ |
Implement in the kenel at another, for the briliancy that uniform bright dipping can be provided and improve bright dipping, backlight module of the present invention is except using dull and stereotyped diffuser plate, going up diffuser plate and the following diffuser plate an also configurable brightness enhancement film.Shown in Fig. 3 C.Backlight module 200c comprises light diffusion element 100, light source 210, last diffuser plate 230, brightness enhancement film 240 and following diffuser plate 220 '.
Hold as can be known above-mentionedly, backlight module 200a, the 200b, the 200c that dispose light diffusion element 100 can provide preferable uniform light simultaneously except that having higher bright dipping briliancy.Therefore, meeting under the prerequisite of design requirement, also can further omit the aforesaid blooming pieces such as diffuser plate, following diffuser plate or brightness enhancement film of going up,, also can make backlight module keep certain bright dipping quality simultaneously to save the cost of manufacture and the package thickness thereof of backlight module.
Fig. 4 illustrates the block schematic diagram into the LCD of one embodiment of the invention.Please refer to Fig. 4, LCD 300 comprises a backlight module 310 and a display panels 320, and wherein backlight module 310 for example is to adopt above-mentioned backlight module 200a, 200b or 200c, and related description does not repeat them here.It is other that display panels 320 is disposed at the exiting surface 120 of light diffusion element 100, to receive by the light 212 of the exiting surface 120 outgoing backlight as demonstration usefulness.
In the present embodiment, display panels 320 for example is to adopt the penetrating type display panel, the semi penetration type display panel, reflective display panel, colored filter display panel of (color filter on array) on active layers, active layers display panel of (array on color filter) on colored filter, vertical orientation type (VA) display panel, horizontal switch type (IPS) display panel, multi-domain perpendicular alignment-type (MVA) display panel, twisted nematic (TN) display panel, super-twist nematic (STN) display panel, pattern vertical orientation type (PVA) display panel, super pattern vertical orientation type (S-PVA) display panel, the advanced person is type (ASV) display panel with great visual angle, fringe field switch type (FFS) display panel, continuous fireworks shape arrange type (CPA) display panel, rotational symmetry is arranged micella type (ASM) display panel, optical compensation curved arrange type (OCB) display panel, super horizontal switch type (S-IPS) display panel, advanced super horizontal switch type (AS-IPS) display panel, extreme edge electric field switch type (UFFS) display panel, stabilizing polymer alignment-type display panel, double vision angle type (dual-view) display panel, three visual angle type (triple-view) display panels, 3 d display (three-dimensional) or other profile plate, or above-mentioned combination.
Because backlight module 310 can provide the bright dipping of high briliancy and high evenness, therefore the LCD 300 of using backlight module 310 can provide better display quality when show image.On making, because of backlight module 310 can reduce the usage quantity of blooming piece, so LCD 300 can have cheaper cost of manufacture, and has lighter weight and less thickness.
In sum, light diffusion element of the present invention, backlight module and LCD have following advantage at least.At first, on the exiting surface of light diffusion element, form at least one light scattering pattern, make when light diffusion element collocation light source uses, bright dipping uniformly can be provided.In addition, when above-mentioned light diffusion element is applied to backlight module,, therefore can reduce the usage quantity of blooming piece because light diffusion element is above-mentioned, reduce cost of manufacture and the reduction package thickness and the weight of backlight module, and can improve the uniformity coefficient and the briliancy of backlight module bright dipping.Therefore, when LCD adopts above-mentioned backlight module, better display quality can be provided, and have lower cost of manufacture, meet compact design requirement.
Though the present invention discloses as above with embodiment; right its is not in order to limiting the present invention, and any have a technical staff in the technical field, without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is when with being as the criterion of being defined.
Claims (17)
1. light diffusion element, it is characterized in that, described light diffusion element has an incidence surface and an exiting surface, and has at least one light scattering pattern on the described exiting surface, the track of wherein said light scattering pattern is a continuous curve, described continuous curve is reeled in regular turn on described exiting surface and is formed a plurality of closed figures, and two adjacent closed figures are overlapped.
2. light diffusion element as claimed in claim 1 is characterized in that, described light scattering pattern is the ditch that protrudes from the rib of described exiting surface or be depressed in described exiting surface.
3. light diffusion element as claimed in claim 1 is characterized in that, described these closed figures are arranged in regular turn along a direction, and all more previous closed figure of each closed figure is offset a fixed range D on described direction.
4. light diffusion element as claimed in claim 3 is characterized in that, the breadth extreme of each closed figure on described direction is W, and D＜W, W/D are integer and 20 μ m≤W≤2000 μ m.
5. light diffusion element as claimed in claim 1 is characterized in that, described at least one light scattering pattern is a plurality of light scattering patterns side by side, and the spacing of adjacent two light scattering patterns is d, and 0 μ m＜d≤100 μ m.
6. a backlight module is characterized in that, described backlight module comprises:
One light diffusion element, have an incidence surface and an exiting surface, and has at least one light scattering pattern on the described exiting surface, the track of wherein said light scattering pattern is a continuous curve, described continuous curve is reeled in regular turn on described exiting surface and is formed a plurality of closed figures, and two adjacent closed figures are overlapped; And
One light source provides a light to enter described light diffusion element by described incidence surface, and described light is by the described exiting surface outgoing of described light diffusion element.
7. backlight module as claimed in claim 6 is characterized in that, described light scattering pattern is the ditch that protrudes from the rib of described exiting surface or be depressed in described exiting surface.
8. backlight module as claimed in claim 6 is characterized in that, described these closed figures are arranged in regular turn along a direction, and all more previous closed figure of each closed figure is offset a fixed range D on described direction.
9. backlight module as claimed in claim 8 is characterized in that, the breadth extreme of each closed figure on described direction is W, and D＜W, W/D are integer and 20 μ m≤W≤2000 μ m.
10. backlight module as claimed in claim 6 is characterized in that, described at least one light scattering pattern is a plurality of light scattering patterns side by side, and the spacing of adjacent two light scattering patterns is d, and 0 μ m＜d≤100 μ m.
11. backlight module as claimed in claim 6 is characterized in that, described backlight module also comprises an optical diaphragm group, is disposed at by the described exiting surface.
12. a LCD is characterized in that, described LCD comprises:
One backlight module comprises:
One light diffusion element, have an incidence surface and an exiting surface, and has at least one light scattering pattern on the described exiting surface, the track of wherein said light scattering pattern is a continuous curve, described continuous curve is reeled in regular turn on described exiting surface and is formed a plurality of closed figures, and two adjacent closed figures are overlapped; And
One light source provides a light to enter described light diffusion element by described incidence surface, and described light is by the described exiting surface outgoing of described light diffusion element; And
One display panels is disposed at by the described exiting surface of described light diffusion element.
13. LCD as claimed in claim 12 is characterized in that, described light scattering pattern is the ditch that protrudes from the rib of described exiting surface or be depressed in described exiting surface.
14. LCD as claimed in claim 12 is characterized in that, described these closed figures are arranged in regular turn along a direction, and all more previous closed figure of each closed figure is offset a fixed range D on described direction.
15. LCD as claimed in claim 14 is characterized in that, the breadth extreme of each closed figure on described direction is W, and D＜W, W/D are integer and 20 μ m≤W≤2000 μ m.
16. LCD as claimed in claim 12 is characterized in that, described at least one light scattering pattern is a plurality of light scattering patterns side by side, and the spacing of adjacent two light scattering patterns is d, and 0 μ m＜d≤100 μ m.
17. LCD as claimed in claim 12 is characterized in that, described backlight module also comprises an optical diaphragm group, is disposed between described light diffusion element and the described display panels.
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| CN200810110114A CN100575988C (en) | 2008-06-10 | 2008-06-10 | Light diffusion element, backlight module and LCD |
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|---|---|---|---|
| CN200810110114A CN100575988C (en) | 2008-06-10 | 2008-06-10 | Light diffusion element, backlight module and LCD |
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