CN101329423A - Light conducting plate and backlight module unit - Google Patents
Light conducting plate and backlight module unit Download PDFInfo
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- CN101329423A CN101329423A CNA2007101125822A CN200710112582A CN101329423A CN 101329423 A CN101329423 A CN 101329423A CN A2007101125822 A CNA2007101125822 A CN A2007101125822A CN 200710112582 A CN200710112582 A CN 200710112582A CN 101329423 A CN101329423 A CN 101329423A
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Abstract
The invention relates to a light guide plate which comprises a lighting surface, a light emitting surface and a light reflection surface positioned at the opposite side of the light emitting surface. A plurality of parallelly arranged first arc-shaped structures are formed on the lighting surface, a plurality of long strip-shaped and parallelly arranged second arc-shaped structures are formed on the light emitting surface, and the direction of the long axis of each second arc-shaped structure is actually parallel to the direction of a normal line of the lighting surface. A plurality of prism structures are distributed on the light reflection surface, a light adjusting structure is distributed on the local area of the light reflection surface which is close to the lighting surface, and the light adjusting structure is overlapped in a staggered way with the prism structures.
Description
Technical field
The invention relates to a kind of light guide plate and module backlight, especially relevant a kind of light guide plate and module backlight with good brightness distribution uniformity.
Background technology
General line source is cold cathode fluorescent lamp (cold cathode fluorescent lamp for example; CCFL) because volume is bigger, be not suitable for the portable electric device of small size.Therefore, for example portable electric device such as mobile phone uses the sidelight source of pointolite as its liquid crystal display module usually.Fig. 1 is for showing the simplified schematic diagram of a known module 100 backlight, as shown in Figure 1, and light emitting diode (light-emitting diode for example; LED) pointolite 104 is in abutting connection with a light incident sides 102a of light guide plate 102, and the bottom surface 102c of the exiting surface 102b of light guide plate 102 and offside all is formed with the prism structure that V-groove 106 is constituted.
In this Known designs, because the lighting angle of pointolite 104 and energy relationship follow lambert to radiate law (Lambert ' s emission law), when the sidelight source of adopting pointolite 104 as the liquid crystal display module, and collocation prismatic lens (not icon) with the light correcting after near the light guide plate 102 exiting surface 102b normal directions, occur as shown in Figure 2 bright line 110 easily at the regional area of contiguous light incident sides 102a, and obviously reduce the brightness distribution uniformity of light guide plate 102.
Summary of the invention
The object of the present invention is to provide a kind of light guide plate and module backlight, can effectively avoid the bright line generation and have favorable brightness distribution uniformity.
The object of the present invention is achieved like this, a kind of in order to receiving the light that sends from least one pointolite and with the light guide plate of its derivation, and this light guide plate comprises an incidence surface, an exiting surface, an and light reflection surface.The light that incidence surface neighbor point light source sends with the acceptance point light source, and be formed with the first arcuate structure thing that plurality of parallel is arranged on the incidence surface.Derive via exiting surface in the light of advancing in this light guide plate inside, be formed with a plurality of second arcuate structure things that are strip and are arranged in parallel on the exiting surface, and the normal direction of the parallel incidence surface of long axis direction essence of each second arcuate structure thing.Light reflection surface is positioned at the offside of exiting surface will be entered the light guiding exiting surface of light guide plate by incidence surface, the light reflection surface regional area that is formed with plural prism structure and contiguous incidence surface on the light reflection surface is formed with a light modulation structure, and this light modulation structure interlocks stacked with prism structure.
A kind of module backlight comprises at least one pointolite, a light guide plate, reaches at least one prismatic lens.Light guide plate is in order to receive the light that sends from least one pointolite and it is derived, and first optical scattering structure that is formed with at least one local distribution on this light guide plate is with the travel path of the light that disperses to enter this light guide plate, and the light that sends towards the external world with this light guide plate inside of even diffusion of second optical scattering structure of at least one whole distribution.Prismatic lens is arranged between this light guide plate and a display panel with the correcting incident light near light guide plate exiting surface normal direction, and module backlight is promoted in positive view directions brightness.Moreover, a diffusion sheet can be set between light guide plate and the display panel or between light guide plate and the prismatic lens, with the light-emitting uniformity of further raising module backlight.In addition, first optical scattering structure is formed at the regional area of bottom surface of light guide plate, and this regional area width can be made as the spacing and the length that are not more than two consecutive point light sources and is not more than 1/3rd of light guide plate length.First optical scattering structure can be the strip structure thing that complex trace is parallel to this light guide plate reflecting surface and constitutes, and this strip structure thing is distributed in the reflecting surface regional area of neighbor point light source one side.Second optical scattering structure can be the plural number first arcuate structure thing that is arranged on the light guide plate incidence surface and be arranged on the light guide plate exiting surface the plural number second arcuate structure thing at least one of them, those arcuate structure things can be strip, and the long axis direction of the vertical first arcuate structure thing of long axis direction essence of the second arcuate structure thing.
By design of the present invention, when the light that sends when pointolite meets with the arcuate structure thing of incidence surface, can make the light evenly diffusion in advance that enters light guide plate, then loosing via reflection of the V-groove on the light reflection surface or folding is diffused as planar and when being directed at exiting surface, the arcuate structure thing that forms on the exiting surface can make emergent light evenly diffusion once more, so can effectively improve the brightness distribution uniformity of light guide plate and can obtain to eliminate the effect of bright line.Moreover, when the light modulation structure of local distribution is formed in addition on the light guide plate bottom, adjustment by size, distributed areas and the density of light modulation structure, can make the incident light of in the regional area of easy generation bright line, advancing meet with light modulation structure and adjust its light path, the light travel path is comparatively disperseed, so can further eliminate bright line and can not reduce the briliancy of the light guide plate front end of neighbor point light source.
Description of drawings
Fig. 1 is for showing the simplified schematic diagram of a known module backlight.
The simplified schematic diagram of Fig. 2 for showing that a known light guide plate bright line distributes.
Fig. 3 is a synoptic diagram, shows an embodiment of light guide plate design of the present invention.
Fig. 4 A to Fig. 4 C is a synoptic diagram, the arcuate structure thing that demonstration the present invention forms on light guide plate and the angle design example of prism structure.
Fig. 5 is a synoptic diagram, shows another embodiment of light guide plate design of the present invention.
Fig. 6 is for showing the simplified schematic diagram of light modulation structure of the present invention in the local distribution regional extent of light guide plate bottom.
Fig. 7 is a synoptic diagram, shows an embodiment of light modulation structure design of the present invention.
Fig. 8 is for showing the synoptic diagram of another embodiment of light modulation structure of the present invention.
Fig. 9 is for showing the synoptic diagram of another embodiment of light modulation structure of the present invention.
Figure 10 is for showing the synoptic diagram of another embodiment of light modulation structure of the present invention.
Figure 11 is for showing the synoptic diagram of another embodiment of light modulation structure of the present invention.
Figure 12 A-12C is a synoptic diagram, shows the size design example of light guide plate light modulation structure of the present invention.
Figure 13 is a synoptic diagram, shows the module embodiment backlight according to the present invention's design.
Drawing reference numeral:
12 light guide plate
The 12a incidence surface
The 12b exiting surface
The 12c light reflection surface
14,14a, 14b light emitting diode
16,18 arcuate structure things
22V type groove
24,26 arcuate furrows
32,32a, 32b, 32c arcuate structure
34,34a, 34b, 34c rectangular structure
36 triangular prism structures
40 modules backlight
42 prismatic lenses
The 42a prism structure
44 diffusion sheets
46 display panels
100 modules backlight
102 light guide plate
The 102a light incident sides
The 102b exiting surface
The 102c bottom surface
104 pointolites
106V type groove
110 bright lines
The d spacing
The M regional area
The S recessed face
The β lead angle
Embodiment
Fig. 3 is a synoptic diagram, shows an embodiment of light guide plate design of the present invention.As shown in Figure 3, light guide plate 12 is in order to receive to light (icon is three light emitting diodes 14) that a little less light source sends and with its derivation.The side of the contiguous light emitting diodes 14 of light guide plate 12 forms an incidence surface 12a, and the end face that forms an angle with incidence surface 12a forms an exiting surface 12b, and the bottom surface that is positioned at exiting surface 12b offside forms a light reflection surface 12c.After the light that light emitting diode 14 sends enters light guide plate 12 inside via incidence surface 12a, the light guiding exiting surface 12b that light reflection surface 12c will advance in light guide plate 12 inside again, last light leaves light guide plate 12 via exiting surface 12b.
Design according to present embodiment, incidence surface 12a is formed with a plurality of arcuate structure things 16, arcuate structure thing 16 is strip and has arc or fan-shaped square section, and each arcuate structure thing 16 its long axis directions that are distributed on the whole incidence surface 12a are parallel to each other, make incidence surface 12a have the profile on approximate corrugated.Also be formed with a plurality of continuously arranged arcuate structure things 18 on the exiting surface 12b, arcuate structure thing 18 is strip equally and has arc or fan-shaped square section, and each arcuate structure thing 18 on whole exiting surface 12b, makes exiting surface 12b have the profile on approximate corrugated equally with the mode arranged distribution of the parallel incidence surface 12a of long axis direction normal direction.Moreover, be formed at the long axis direction of the arcuate structure thing 16 on the vertical incidence surface 12a of long axis direction of the arcuate structure thing 18 on the exiting surface 12b.Light reflection surface 12c is distributed with a plurality of prism structures that V-groove 22 is constituted on the whole surface, and the long axis direction of each V-groove 22 is parallel to each other and is vertical with the long axis direction of arcuate structure thing 18.
By above-mentioned structural design, when the light that sends when light emitting diode 14 meets with the arcuate structure thing 16 of incidence surface 12a, can make the light evenly diffusion in advance that enters light guide plate 12, light looses via the V-groove on the light reflection surface 12c 22 reflection or folding and is diffused as planar and when being directed at exiting surface 12b afterwards, the arcuate structure thing 18 of exiting surface 12b can so can effectively improve emergent light evenly diffusion once more the brightness distribution uniformity of light guide plate 12 and can obtain to eliminate the effect of bright line.
Fig. 4 A to Fig. 4 C is a synoptic diagram, the arcuate structure thing that demonstration the present invention forms on light guide plate 12 and the angle design of prism structure.Shown in Fig. 4 A, arc angle θ 1 scope of arcuate structure thing 16 relative incidence surface 12a is designed to that preferable light diffusion effect is arranged when 39-140 spends; On the other hand, shown in Fig. 4 B, arc angle θ 2 scopes of arcuate structure thing 18 relative exiting surface 12b can be designed to that preferable light diffusion effect is arranged when 62-164 spends.Moreover, shown in Fig. 4 C, the V-groove 22 that constitutes prism structure has leg-of-mutton square section, and the recessed face lead angle β of V-groove 22 can be made as the 1-7 degree, and wherein lead angle β is defined as V-groove 22 towards the recessed face S of light emitting diode 14 and the angle of incidence surface 12a normal direction.
In addition, though among the embodiment as shown in Figure 3, arcuate structure thing 16,18 is and protrudes in the out-of-plane arc bump of light guide plate, but it does not limit, in another embodiment, arcuate structure thing 16 also can be illustrated in figure 5 as the last arcuate furrow 24 towards light guide plate 12 internal recess of incidence surface 12a, and arcuate structure thing 18 also can be the last arcuate furrow 26 towards light guide plate 12 internal recess of exiting surface 12b.Perhaps, also can form arc bump and arcuate furrow simultaneously on same plane, above-mentioned various variation examples all can obtain the light diffusion effect.In addition, the abutment of two adjacent arcuate structure things does not limit, for example can be as shown in Figure 3 two adjacent arcuate structure things 18 have spacing when arranging, perhaps arrangement mode as illustrated in Figure 5, two adjacent arcuate structure things (arcuate furrow 26) are connected with each other when arranging and do not have spacing.In addition, as shown in Figure 5, in the formed prism structure in light guide plate 12 bottoms, the distribution density of V-groove 22 can increase with the distance with incidence surface, with further raising briliancy homogeneity.Moreover, the abutment of two adjacent V-grooves 22 does not limit yet, for example can be as shown in Figure 3 two adjacent V-grooves 22 be connected with each other when arranging and do not have a spacing, have spacing d when perhaps two adjacent V-grooves 22 are arranged as shown in Figure 5, and the value of spacing d is with diminishing gradually away from incidence surface 12a.
The following briliancy homogeneity of the present invention's one local distribution that then illustrates is adjusted the design of structure (abbreviation light modulation structure), the light modulation structure of this local distribution also can be considered a kind of optical scattering structure, it is formed at zone that light guide plate 12 bottoms easily produce bright line to obtain the regional inhomogeneity effect of briliancy of adjusting, and further avoids bright line to produce.As shown in Figure 6, neighbor point light source and in the regional area M of pointolite both sides, form easily bright line on the light guide plate 12, therefore can in this regional area M, make light modulation structure and adjust its size and distribution density, make the incident light of in the regional area M of easy generation bright line, advancing meet with light modulation structure and adjust its light path, the light travel path is comparatively disperseed, so can further eliminate bright line and can not reduce the briliancy of light guide plate 12 front ends of neighbor point light source.Must notice that the light modulation structure of local distribution of the present invention is arranged on the light reflection surface 12c of light guide plate 12 bottoms, that is staggered stacked on same surface with V-groove 22.Moreover, when light guide plate 12 receives the light that sends from the plurality of points light source, and those pointolites are when determining deviations are in abutting connection with light guide plate incidence surface 12a at interval, the regional area width that is distributed with this light modulation structure is preferable with the spacing that is not more than two consecutive point light sources, and this regional area along the length of incidence surface 12a normal direction to be not more than the 1/3rd preferable of light guide plate length.
Fig. 7 is a synoptic diagram, shows an embodiment of light modulation structure design of the present invention.According to design of the present invention, the briliancy of light modulation structure is adjusted effect can be by the depth (thickness on the Z direction) that changes structure, adjusted along the length of long axis direction (Y direction) and the distribution density on directions X etc.Must note Figure 7 shows that regional area bottom the light guide plate in the middle of two light emitting diode 14a and 14b, and should the zone in the length of Y direction to be not more than the 1/3 preferable of light guide plate length.In addition, the position of exiting surface 12b relative light modulation structure on the Z direction does not limit.As shown in Figure 7, light modulation structure is that strip arcuate structure 32 by the vertical incidence surface of a plurality of its long axis directions is constituted in present embodiment, that is the long axis direction of the arcuate structure thing 18 on the long axis direction of each strip arcuate structure 32 and the exiting surface 12b is parallel, and with V-groove 22 vertical interlaceds of light guide plate bottom.Moreover, according to present embodiment, strip arcuate structure 32 has identical thickness distribution (that is with arcuate structure 32 have identical thickness) on its long axis direction (Y direction), and the distribution density on directions X increases along with the distance with light emitting diode 14a, 14b and improves that (arcuate structure 32 its sizes along directions X of past more regional area central point are big more; 32a＞32b＞32c).Moreover the profile of light modulation structure only needs to reach disperses incident light travel path effect to get final product, and not being defined as the square section is arc or fan-shaped strip arcuate structure 32.For example also can be square section shown in Figure 8 is the rectangular structure 34 of rectangle, or square section shown in Figure 9 is leg-of-mutton triangular prism structure 36.
Figure 10 is for showing the synoptic diagram of another embodiment of light modulation structure of the present invention.According to present embodiment, light modulation structure has identical thickness distribution (that is with rectangular structure 34 have identical thickness) on its long axis direction (Y direction), and the distribution density on directions X is fixed, and does not increase along with the distance with light emitting diode 14a, 14b and changes (that is its measure-alike along directions X of each rectangular structure 34; 34a=34b=34c).Though the light modulation structure of Figure 10 illustrates with rectangular structure 34, when arcuate structure or the triangular prism structure shown in Figure 9 that can understand as shown in Figure 7 all are suitable for the design of size shown in Figure 10 and distribution density.
Figure 11 is for showing the synoptic diagram of another embodiment of light modulation structure of the present invention.According to present embodiment, the thickness of light modulation structure on its long axis direction (Y direction) is towards reducing (that is with rectangular structure 34 have the thickness of gradual change) gradually away from light emitting diode 14a, 14b direction, and the thickness court of light modulation structure on the direction vertical with long axis direction (directions X) increases gradually away from the direction of light emitting diode 14a or 14b.Though the light modulation structure of Figure 11 illustrates with rectangular structure 34, when arcuate structure or the triangular prism structure shown in Figure 9 that can understand as shown in Figure 7 all are suitable for the design of size shown in Figure 11 and distribution density.
Figure 12 A-12C is a synoptic diagram, shows the size design example of light guide plate light modulation structure of the present invention.Shown in Figure 12 A, with the staggered stacked arc light modulation structure 32 of prism structure, its thickness can be fixing or gradual change, when thickness H between 0.1 micron to 100 microns, and width W has preferable bright line to eliminate effect between 0.1 micron to 200 microns.Shown in Figure 12 B, with the staggered stacked rectangular parallelepiped light modulation structure 34 of prism structure, its thickness can be fixing or gradual change, when thickness H between 0.1 micron to 100 microns, and width W has preferable bright line to eliminate effect between 0.1 micron to 200 microns.Shown in Figure 12 C, with the staggered stacked triangular prism light modulation structure 36 of prism structure, its thickness can be fixing or gradual change, when thickness H between 0.1 micron to 100 microns, and width W has preferable bright line to eliminate effect between 0.1 micron to 200 microns.
Figure 13 is a synoptic diagram, shows module 40 embodiment backlight according to the present invention's design.As shown in figure 13, this module backlight comprises a light guide plate 12, at least one pointolite (for example light emitting diode 14), a prismatic lens 42, reaches a diffusion sheet 44.The incidence surface of light guide plate 12 is formed with arcuate structure thing 16, and exiting surface is formed with arcuate structure thing 18, and the regional area of light guide plate 12 bottom neighbor point light sources is formed with light modulation structure (for example arcuate structure 32).Prismatic lens 42 is arranged at 46 of light guide plate 12 and display panels, the prism structure 42a of prismatic lens 42 is towards the light guide plate exiting surface, and the extension orientation of prism structure 42a is vertical with the long axis direction of exiting surface arcuate structure thing 18, the light that is sent by light guide plate 12 can make module 40 backlight promote in positive view directions brightness by prismatic lens 42 correctings near light guide plate 12 exiting surface normal directions.Moreover, a diffusion sheet 44 can be set in 42 of prismatic lens 42 and display panel 46 (shown in Figure 13) or light guide plate 12 and prismatic lenses, with the light-emitting uniformity of further raising module 40 backlight.
Though the present invention discloses with specific embodiment; but it is not in order to limit the present invention; any those skilled in the art; the displacement of the equivalent assemblies of under the prerequisite that does not break away from design of the present invention and scope, having done; or, all should still belong to the category that this patent is contained according to equivalent variations and modification that scope of patent protection of the present invention is done.
Claims (15)
1. light guide plate, in order to receive the light that sends from least one pointolite and, to it is characterized in that this light guide plate comprises with its derivation:
One incidence surface, contiguous this pointolite to be receiving the light that this pointolite sends, and be formed with the first arcuate structure thing that plurality of parallel is arranged on this incidence surface;
Form an exiting surface of an angle with this incidence surface, the light of advancing in this light guide plate inside is derived via this exiting surface, be formed with a plurality of second arcuate structure things that are strip and are arranged in parallel on this exiting surface, and the normal direction of parallel this incidence surface of long axis direction of the described second arcuate structure thing;
One light reflection surface, the offside that this light reflection surface is positioned at this exiting surface is with this exiting surface that will be led by the light that this incidence surface enters this light guide plate, this light reflection surface regional area that this light reflection surface is formed with plural prism structure and contiguous this incidence surface is formed with a light modulation structure, and this light modulation structure interlocks stacked with this prism structure.
2. light guide plate as claimed in claim 1, it is characterized in that: the described first arcuate structure thing is strip and its long axis direction is arranged in parallel with each other on this incidence surface, and the long axis direction of the vertical described first arcuate structure thing of the long axis direction of the described second arcuate structure thing.
3. light guide plate as claimed in claim 1 is characterized in that: described first and second arcuate structure thing has arc or fan-shaped square section.
4. light guide plate as claimed in claim 1 is characterized in that: described first and second arcuate structure thing is to protrude in the out-of-plane arc bump of this light guide plate or towards the arcuate furrow of this light guide plate internal recess.
5. light guide plate as claimed in claim 1 is characterized in that: this first arcuate structure thing arc angle of this incidence surface relatively is the 39-140 degree, and this second arcuate structure thing arc angle of this exiting surface relatively is the 62-164 degree.
6. light guide plate as claimed in claim 1 is characterized in that: this light modulation structure is constituted by plural strip structure thing, and the long axis direction of described strip structure thing is parallel with the long axis direction of the described second arcuate structure thing.
7. light guide plate as claimed in claim 6, it is characterized in that: this strip structure thing has fan-shaped, arc, rectangle or leg-of-mutton square section, and the thickness of this strip structure thing is the 0.1-100 micron, and the width of this strip structure thing is the 0.1-200 micron.
8. light guide plate as claimed in claim 6 is characterized in that: respectively this strip structure thing is identical or towards reducing gradually away from this pointolite direction along the thickness distribution of its long axis direction.
9. light guide plate as claimed in claim 6, it is characterized in that: described strip structure thing increases away from this pointolite direction gradually along the court of the thickness on the direction vertical with its long axis direction, and described strip structure thing increases away from this pointolite direction gradually along the court of the distribution density on the direction vertical with its long axis direction.
10. light guide plate as claimed in claim 1, it is characterized in that: described prism structure is that complex trace is arranged the V-groove that is formed on this light reflection surface, the long axis direction of described V-groove is vertical with the long axis direction of this second arcuate structure thing and this light modulation structure, and the distribution density of described V-groove on this light reflection surface increases with the increase with the distance of this pointolite.
11. a module backlight is characterized in that this module backlight comprises:
The plurality of points light source;
One light guide plate, in order to receive the light that sends from this pointolite and it is derived, first optical scattering structure that is formed with at least one local distribution on this light guide plate is with the travel path of the light that disperses to enter this light guide plate, and the light that sends towards the external world with this light guide plate inside of even diffusion of second optical scattering structure of at least one whole distribution;
Wherein those pointolites interval one determining deviations are in abutting connection with this light guide plate incidence surface, this first optical scattering structure is formed at least one regional area of this bottom surface of light guide plate, and spacing and this regional area length that this regional area width is not more than two consecutive point light sources are not more than 1/3rd of this light guide plate length;
At least one prismatic lens be arranged between this light guide plate and a display panel, and the prism structure of this prismatic lens is towards this light guide plate.
12. module backlight as claimed in claim 11 is characterized in that: this module backlight comprises that also a diffusion sheet is arranged between this prismatic lens and this display panel or between this light guide plate and this prismatic lens, and described pointolite is a light emitting diode.
13. module backlight as claimed in claim 11, it is characterized in that: this first optical scattering structure is constituted by the strip structure thing that complex trace is parallel to this light guide plate reflecting surface, this strip structure thing is distributed in this reflecting surface regional area of contiguous described pointolite one side, and respectively this strip structure thing is identical or towards reducing gradually away from this pointolite direction along the thickness distribution of its long axis direction.
14. module backlight as claimed in claim 11, it is characterized in that: this second optical scattering structure be arranged in the plural number first arcuate structure thing on this light guide plate incidence surface and be arranged on this light guide plate exiting surface the plural number second arcuate structure thing at least one of them, the long axis direction of the vertical described first arcuate structure thing of the long axis direction of the wherein said second arcuate structure thing.
15. module backlight as claimed in claim 14 is characterized in that: the described first arcuate structure thing arc angle of this incidence surface relatively is the 39-140 degree, and the arc angle of relative this exiting surface of the described second arcuate structure thing is the 62-164 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101125822A CN101329423A (en) | 2007-06-21 | 2007-06-21 | Light conducting plate and backlight module unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101125822A CN101329423A (en) | 2007-06-21 | 2007-06-21 | Light conducting plate and backlight module unit |
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| CN101329423A true CN101329423A (en) | 2008-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2007101125822A Pending CN101329423A (en) | 2007-06-21 | 2007-06-21 | Light conducting plate and backlight module unit |
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