CN105929481A - Backlight module and light guide plate thereof - Google Patents
Backlight module and light guide plate thereof Download PDFInfo
- Publication number
- CN105929481A CN105929481A CN201610557764.XA CN201610557764A CN105929481A CN 105929481 A CN105929481 A CN 105929481A CN 201610557764 A CN201610557764 A CN 201610557764A CN 105929481 A CN105929481 A CN 105929481A
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- light
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- density micro
- structured pattern
- micro structured
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention relates to a backlight module and a light guide plate thereof. The backlight module comprises the light guide plate and a light source assembly, wherein the light guide plate comprises a light transmitting plate body, a first density micro-structure pattern and a plurality of second density micro-structure patterns; the light transmitting plate body comprises a light entering side surface and a light exiting surface which is adjacently connected to the light entering side surface; the light exiting surface is divided into a surface light source region and a surrounding region which surrounds the surface light source region; the first density micro-structure pattern is distributed in the surface light source region; the second density micro-structure patterns are positioned in the surrounding region; a second density is greater than a first density; the second density micro-structure patterns are linearly arrayed along the light entering side surface; the light source assembly comprises a substrate and a plurality of point light sources; the point light sources are linearly arrayed on the substrate and face the light entering side surface at intervals; an interval region is defined between each two optional adjacent point light sources; each of the second density micro-structure patterns is aligned with the corresponding interval region; and each second density micro-structure pattern is an isosceles trapezoid.
Description
Technical field
The present invention relates to a kind of light guide plate, and particularly to the light guide plate of a kind of backlight module.
Background technology
Backlight module is divided into down straight aphototropism mode set and side entrance back module.Side entrance back module has following structure, i.e. light source and is configured to the side in the face of light guide plate, and multiple optical sheet is arranged between liquid crystal panel and light guide plate.In side entrance back module, light is exposed to the side of light guide plate by light source and line source or point source are converted into area source by light guide plate.
In both backlight modules, side entrance back module owing to providing the problem to the side of light guide plate with hot spot phenomenon by light.Fig. 1 is the view explaining hot issue, and this figure is to selectively show light guide plate 10 and be used as the LED 1 of light source, the top plan view of LED2.As it is shown in figure 1, the first LED 1 and the second LED 2 are arranged at side, in order in the face of the edge of light guide plate 10.It is known that light emitting diode is directivity element, therefore light enters light guide plate 10 with predetermined deflection (α).Accordingly, there are the part (oblique line portion in Fig. 1, hereinafter referred to as " shadow region GA ") that the light from the first LED 1 does not mix with the light from the second LED 2.Therefore, shadow region GA seems dark, and light seems bright from the part (hereinafter referred to as " luminous zone WA ") of the first LED 1 and the second LED 2, thus creates the difference of brightness according to position and result in hot issue.Due to focus, so the plane of incidence in the face of light emitting diode of light guide plate 10 has wavy pattern.Because light guide plate is point source to become area source and provides the parts to the liquid crystal panel being disposed above by light, if so light is rendered as wavy, then the brightness of liquid crystal panel becomes uneven due to the wavy pattern of light guide plate, thus can not suitably show image with desired shape.A kind of simple mode overcoming this hot issue is to increase the quantity of light emitting diode.It is to say, hot issue can be by being enough densely aligned light emitting diode to prevent the formation of the shadow region GA shown in Fig. 1 from overcoming.But, the quantity so increasing light emitting diode needs higher power consumption, and this is less desirable.Another way is to increase the size of frame, in order to focus part is blocked thus invisible.
Liquid crystal panel and back light unit are generally housed in shell: bonnet and protecgulum combine to be encapsulated in the liquid crystal panel planted therebetween and back light unit.When encapsulation, the edge of liquid crystal panel is stopped by protecgulum.The part that liquid crystal panel is stopped by protecgulum is referred to as frame.
Frame is in front covering liquid crystal panel, thus reduces the size of the viewing area of liquid crystal panel display image.The liquid crystal indicator issued recently reduces the size of frame, thus has the viewing area of expansion, and this is attractive to consumer at design aspect.So, the method increasing frame size for the purpose of solution hot issue does not have advantage and is out of favour at design aspect due to the reduction of viewing area.
As can be seen here, above-mentioned light guide plate still suffers from inconvenience and defect, and needs to be improved further.Therefore, how to efficiently solve above-mentioned inconvenience and defect, one of current important research and development problem of real genus, also become currently associated field and need the target of improvement badly.
Summary of the invention
The technical problem to be solved in the present invention is to overcome the optical effect of backlight module traditional in prior art not good enough, and the defect of the reduction of overall light utilization ratio and the uniformity, it is provided that a kind of backlight module and its light guide plate.
The present invention is to solve above-mentioned technical problem by following technical proposals:
A kind of backlight module, it is characterised in that comprise:
One light guide plate, comprises:
One printing opacity plate body, comprises a light incident sides and an exiting surface adjoining this light incident sides, and this exiting surface is divided into a source region with one around the cincture district in this area source region；
One first density micro structured pattern, is distributed in this area source region；And
Multiple second density micro structured pattern, are positioned at this cincture district, and along this light incident sides linear arrangement, wherein this second density is more than this first density；
And
One light source assembly, comprises:
One substrate；And
Plurality of points light source, linear arrangement is on this substrate, and compartment of terrain is in the face of this light incident sides, and between those point sources that any two of which is adjacent, definition has an interval region, and each second density micro structured pattern align those interval regions one of them；
Each of which the second density micro structured pattern for an isosceles trapezoid,
The bottom length of this isosceles trapezoid is equal to the distance between adjacent those point sources of any two, and the half of a length of bottom, upper base length, a width in this cincture district is equal to this length on base on trapezoidal one.
It is preferred that the depth of microstructure of described second density micro structured pattern is not less than 34 microns, radius is not less than 59 microns.
It is preferred that described light incident sides is serrated face.
It is preferred that along deviating from the direction of described light incident sides, the density of described first density micro structured pattern is gradually increased.
Present invention also offers a kind of light guide plate, it is characterised in that this light guide plate includes:
One printing opacity plate body, including a source region and a transitional region, this transitional region is long and narrow, and between this area source region and this light incident sides；
One first density micro structured pattern, is distributed in this area source region；And
A plurality of second density micro structured pattern, those the second density micro structured pattern each are in an isosceles trapezoid, it is positioned at this transitional region, the distance between those point sources that the bottom length of this isosceles trapezoid is adjacent equal to any two, the half of a length of bottom, upper base length.One width in this cincture district is equal to this length on base on trapezoidal one and interwoven with those point sources spaced；The depth of microstructure of described second density micro structured pattern is not less than 34 microns, and radius is not less than 59 microns；
Along deviating from the direction of described light incident sides, the density of described first density micro structured pattern is gradually increased；
Wherein, when those point light source light-emittings spaced, those the second density micro structured pattern form pseudo-light source, and then desalination optics bright spot between any two those point sources spaced.
On the basis of meeting common sense in the field, above-mentioned each optimum condition, can combination in any, obtain the preferred embodiments of the invention.
The most progressive effect of the present invention is:
Second density micro structured pattern of these isosceles trapezoids of the present invention can be corresponding to providing the obvious contrast of pseudo-light source, the thus brightness of homogenization transitional region, and then desalination optics bright spot and dark space in transitional region between any two optics bright spot.
Accompanying drawing explanation
Fig. 1 is the view of the hot issue of the light guide plate of backlight module in prior art.
Fig. 2 is the structural representation of light guide plate of the present invention.
Fig. 3 is the structural representation of the light guide plate of comparative example of the present invention.
Detailed description of the invention
Below by scheme to disclose the detailed description of the invention of the present invention, as clearly stated, the details in many practices will be explained in the following description.It should be appreciated, however, that the details in these practices is not applied to limit the present invention.It is to say, in some embodiments of the present invention, the details in these practices is non-essential.Additionally, for simplify graphic for the sake of, some known usual structures and assembly will illustrate in the drawings in the way of simply illustrating.
Fig. 2 shows the structural representation of the light guide plate according to embodiment of the present invention.As in figure 2 it is shown, a kind of backlight module, comprising: a light guide plate 1, comprise: a printing opacity plate body 2, comprise a light incident sides and an exiting surface adjoining this light incident sides, this exiting surface is divided into a source region B and around the cincture district A of this area source region B；One first density micro structured pattern 3, is distributed in this area source region；And multiple second density micro structured pattern 4, it is positioned at this cincture district, and along this light incident sides linear arrangement, wherein this second density is more than the first density；And a light source assembly 5, comprise: a substrate 6；And plurality of points light source 7, linear arrangement is on this substrate, and compartment of terrain is in the face of this light incident sides, between those point sources that any two of which is adjacent, definition has an interval region C, and those the second density micro structured pattern each align those interval regions one of them；The external form of each of which the second density micro structured pattern is an isosceles trapezoid.
So, when these spaced point sources are luminous to light incident sides and then produce optics bright spot, second density micro structured pattern 4 of these isosceles trapezoids above-mentioned can form pseudo-light source in position between corresponding to wantonly two optics bright spots (hot spot), allow the pseudo-light source of these optics bright spots and these produce mix, thus homogenization brightness, and then desalinate the obvious contrast of optics bright spot and dark space.
More specifically, the bottom length of this isosceles trapezoid is equal to the distance between those point sources that any two is adjacent, the half of a length of bottom, upper base length.One width in this cincture district is equal to this length on base on trapezoidal one.It is preferred that described light incident sides is serrated face.It is preferred that along deviating from the direction of described light incident sides, the density of described first density micro structured pattern is gradually increased.And its concrete shape can pass through the regulation and control upper bottom of isosceles trapezoid and side these three parameter controls.
In the present embodiment, each second density micro structured pattern is made up of multiple optical microstructures, and these optical microstructures compartment of terrains are distributed.For giving an actual example, at 46 inches, on the light guide plate design example of 2mm thickness, with the degree of depth 30 microns, the site that radius is 50 microns realizes above-mentioned optical microstructures, second its distribution density of density micro structured pattern 130 can be selected according to case between 60%～70%, and distribution density refers to the gross area and the area ratio of the second density micro structured pattern of multiple optical microstructures；If this is because the brightness of point source is relatively strong, then, when utilizing the second pseudo-light source of density micro structured pattern emulation, need closeer or deeper optical microstructures.Verifying through actual fabrication sample, it can make optical uniformity reach more than 75%.But, the invention is not restricted to this, there is the people of usual knowledge in the technical field of the invention, it is possible to depending on being actually needed, change and set distribution density as in the range of other.
Fig. 3 is the partial enlarged drawing of comparative example of the present invention, in figure 3, the structure of the light guide plate of this comparative example is roughly the same with the structure of above-mentioned light guide plate, one of its difference is that the second density micro structured pattern 4 is square, inventor obtains the optical uniformity of transitional region according to foursquare second density micro structured pattern 4, about 60%.It follows that compared to foursquare second density micro structured pattern 4, when the second density micro structured pattern 4 is isosceles trapezoid, available preferably light uniform results.Therefore, the shape of the second density micro structured pattern not can be with equivalent replacement by arbitrary graphic pattern.
Additionally, (not shown in half elliptic comparative example for the second density micro structured pattern 4, its difference is that the second density micro structured pattern 4 is in half elliptic), the optical uniformity of transitional region about 60-70%, it can thus be appreciated that, when the second density micro structured pattern 4 is isosceles trapezoid shape, available preferably light uniform results.
Although the foregoing describing the detailed description of the invention of the present invention, it will be appreciated by those of skill in the art that this is merely illustrative of, protection scope of the present invention is defined by the appended claims.These embodiments, on the premise of without departing substantially from the principle of the present invention and essence, can be made various changes or modifications, but these changes and amendment each fall within protection scope of the present invention by those skilled in the art.
Claims (5)
1. a backlight module, it is characterised in that comprise:
One light guide plate, comprises:
One printing opacity plate body, comprises a light incident sides and an exiting surface adjoining this light incident sides, and this exiting surface is divided into a source region with one around the cincture district in this area source region；
One first density micro structured pattern, is distributed in this area source region；And
Multiple second density micro structured pattern, are positioned at this cincture district, and along this light incident sides linear arrangement, the most above-mentioned second density is more than above-mentioned first density；
And
One light source assembly, comprises:
One substrate；And
Plurality of points light source, linear arrangement is on this substrate, and compartment of terrain is in the face of this light incident sides, and between those point sources that any two of which is adjacent, definition has an interval region, and each second density micro structured pattern alignment interval region one of them；
Each of which the second density micro structured pattern for an isosceles trapezoid,
Distance between those point sources that the bottom length of this isosceles trapezoid is adjacent equal to any two, the half of a length of bottom, upper base length, the width in this cincture district is equal to the length on this trapezoidal upper base.
Backlight module the most according to claim 1, it is characterised in that the depth of microstructure of described second density micro structured pattern is not less than 34 microns, radius is not less than 59 microns.
A kind of backlight module the most according to claim 1, it is characterised in that described light incident sides is serrated face.
Backlight module the most according to claim 1, it is characterised in that along deviating from the direction of described incidence surface, the density of described first density micro structured pattern is gradually increased.
5. a light guide plate, it is characterised in that this light guide plate includes:
One printing opacity plate body, including a source region and a transitional region, this transitional region is long and narrow, and between area source region and this light incident sides；
One first density micro structured pattern, is distributed in this area source region；And
A plurality of second density micro structured pattern, each second density micro structured pattern is in an isosceles trapezoid, it is positioned at this transitional region, distance between those point sources that the bottom length of this isosceles trapezoid is adjacent equal to any two, the half of a length of bottom, upper base length, one width in this cincture district is equal to this length on base on trapezoidal one and interwoven with those point sources spaced；The depth of microstructure of described second density micro structured pattern is not less than 34 microns, and radius is not less than 59 microns；Along deviating from the direction of described light incident sides, the density of described first density micro structured pattern is gradually increased；Wherein, when those point light source light-emittings spaced, those the second density micro structured pattern form pseudo-light source, and then desalination optics bright spot between any two those point sources spaced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610557764.XA CN105929481A (en) | 2016-07-15 | 2016-07-15 | Backlight module and light guide plate thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610557764.XA CN105929481A (en) | 2016-07-15 | 2016-07-15 | Backlight module and light guide plate thereof |
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| CN105929481A true CN105929481A (en) | 2016-09-07 |
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| CN201610557764.XA Pending CN105929481A (en) | 2016-07-15 | 2016-07-15 | Backlight module and light guide plate thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110187430A (en) * | 2019-05-29 | 2019-08-30 | 重庆翰博光电有限公司 | A kind of light guide plate mesh point arrangement and its design method |
| CN110320587A (en) * | 2018-03-30 | 2019-10-11 | 光宝电子(广州)有限公司 | Light guide plate and light source module |
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| CN205374796U (en) * | 2016-02-23 | 2016-07-06 | 安比斯特殊玻璃（苏州）有限公司 | Glass light guide plate and liquid crystal display module thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110320587A (en) * | 2018-03-30 | 2019-10-11 | 光宝电子(广州)有限公司 | Light guide plate and light source module |
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| CN110187430A (en) * | 2019-05-29 | 2019-08-30 | 重庆翰博光电有限公司 | A kind of light guide plate mesh point arrangement and its design method |
| CN110187430B (en) * | 2019-05-29 | 2024-02-06 | 重庆翰博光电有限公司 | Light guide plate mesh point arrangement structure and design method thereof |
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Application publication date: 20160907 |