CN100381914C - Microstructure of light conducting plate - Google Patents
Microstructure of light conducting plate Download PDFInfo
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- CN100381914C CN100381914C CNB2005101183636A CN200510118363A CN100381914C CN 100381914 C CN100381914 C CN 100381914C CN B2005101183636 A CNB2005101183636 A CN B2005101183636A CN 200510118363 A CN200510118363 A CN 200510118363A CN 100381914 C CN100381914 C CN 100381914C
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- guide plate
- light guide
- light
- microstructure
- reflection surface
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Abstract
The present invention discloses a microstructure of a light guide plate, wherein the light guide plate comprises a light irradiating surface, a light emitting surface and a bottom surface, wherein the microstructure is arranged on the bottom surface of the light guide plate. The micro structure is formed by that an inward concave towards the light guide plate is crossed with the light guide plate, the micro structure comprises a light reflecting surface which is positioned between the light irradiating surface and the light emitting surface and forms an included angle theta with the bottom surface of the light guide plate, wherein the light reflecting surface forms an arc quadrangle or a sector by the overhead view from the light emitting surface, the arc quadrangle has two parallel arc line sides, and the car lines of the two arc line sides have the same circle center. Thereby, the brightness of the light guide plate is improved by the way that the path of light is changed by the light reflecting surface.
Description
Technical field
The present invention relates to a kind of microstructure of light guide plate, it is applied on the backlight liquid crystal display module.
Background technology
Please refer to Fig. 1, synoptic diagram for known light guide plate 1 microstructure 2, it produces on the bottom surface 12 of smooth light guide plate 1 with etching mode has the microstructure 2 of rough surface, and the surface that incident ray 50 is injected microstructure 2 promptly produces the reflection ray 51 or the refracted ray 52 of scattering.When the incident angle of the exiting surface 11 of reflection ray 51 incident light guide plate 1 during, then penetrate the exiting surface 11 of light guide plate 1 less than critical angle; If incident angle is greater than critical angle, then reflection ray 51 returns in the light guide plate 1 and continues do total reflection and transmits.
Fig. 2 is the coordinate of key drawing 3a, and Fig. 3 a is for going out the light intensity radar map from the exiting surface 11 of known light guide plate 1.Horizontal ordinate represent level angle (HarizOntal angle, HA), angle move normal direction 13 from exiting surface 11, turn to and light source 4 vertical direction 14; Ordinate represents that (Vertical angle, VA), the mobile normal direction 13 from exiting surface 11 of angle turns to and light source 4 parallel directions 15 vertical angle.Among Fig. 3 a, each closed curve is represented out light intensity (intensity) value, and it is defined as the luminous flux of unit solid angle, and this figure has 10 closed curves, represents the light intensity that of 10 grades.By Fig. 3 a as can be known, from known light guide plate 1 bright dipping go out the approximate blue vigorous inferior distribution (LambertiandistributiOn) of light intensity distributions, that is on Fig. 3 a, produce circular closed curve, go out light intensity and present cosine function and distribute.The bright dipping intensity conversion is become brightness value, and promptly briliancy is equivalence on all directions.
See also Fig. 3 b, be known light guide plate 1 exiting surface 11 go out the light intensity stereographic map.It is approximate spherical that this goes out light intensity distributions, that is near blue vigorous inferior distribution, and this figure is considerable to look out the variation of light intensity on each angle or direction.
In addition, No. the 575759th, TaiWan, China patent announcement, No. the 6629764th, United States Patent (USP) is all arranged in pairs or groups linear light source with No. 6755545 light guide plate and is implemented, then both exiting surfaces are wavy, and the microstructure that the three discloses is the pyramid from light guide plate bottom surface indent, wherein the Taiwan patent announcement is half-conical or triangular pyramidal No. 575759, side is analysed and observe and is triangle, and the microstructure side of No. the 6629764th, United States Patent (USP) to analyse and observe be two continuous triangles, the similar capitalization of shape M, and the example that discloses comprises that the bottom surface is the inclined-plane, and United States Patent (USP) then is for No. 6755545 single pyramidal in addition.
Generally speaking, easily scattering and concentrated of pyramidal interior empty structure reflection ray.
Summary of the invention
The object of the present invention is to provide a kind of microstructure of light guide plate, it can promote the ejaculation intensity of light to the light guide plate exiting surface, to promote the briliancy of light guide plate.
For achieving the above object, technical solution of the present invention is:
A kind of microstructure of light guide plate, this light guide plate comprises incidence surface, exiting surface, bottom surface, the light of light source enters light guide plate by incidence surface, and by exiting surface ejaculation light guide plate, its bottom surface then is positioned at the opposite face of exiting surface, and this microstructure is arranged on the bottom surface, formation is intersected toward the depression and the light guide plate of light guide plate indent in this microstructure system, it comprises: a light reflection surface, between incidence surface and exiting surface, and press from both sides an angle θ with the bottom surface of light guide plate; And the shape of this light reflection surface overlooked by exiting surface and is the arc quadrilateral, and this arc quadrilateral has two parallel camber line limits, and the camber line on this two camber lines limit is a concentric.The shape of this light reflection surface by exiting surface overlook also can be fan-shaped.
The microstructure of described light guide plate further comprises: a back transparent surface, be adjacent to light reflection surface, and light reflection surface is far away from the incidence surface of light guide plate relatively, and vertical with the bottom surface of light guide plate; Two side transparent surfaces are adjacent to two sides of light reflection surface, and vertical with bottom surface of light guide plate; And a hollow out face, be the interior recess of bottom surface of light guide plate.
Described light reflection surface is taken out by a cross section circular cone wide at the top and narrow at the bottom, and the central point of this cross section circular cone is near incidence surface, and cut coverage is cut an angle beta from cross section circular cone central point, and cuts out the light reflection surface that central angle is β.
Described light reflection surface is taken out by a cross section elliptic cone wide at the top and narrow at the bottom, and the central point of this cross section elliptic cone is near incidence surface, and cut coverage is cut an angle beta from cross section circular cone central point, and cuts out the light reflection surface that central angle is β.
Described light reflection surface is taken out by a up-narrow and down-wide cross section circular cone, and the central point of this cross section circular cone is near the back transparent surface, and cut coverage is cut an angle beta from cross section circular cone central point, and cuts out the light reflection surface that central angle is β.
Described light reflection surface is taken out by a up-narrow and down-wide cross section elliptic cone, and the central point of this cross section elliptic cone is near the back transparent surface, and cut coverage is cut an angle beta from cross section elliptic cone central point, and cuts out the light reflection surface that central angle is β.
The shape that described light reflection surface side is analysed and observe can be straight line, inner concave curve or convex outer curve.
After adopting such scheme, because the microstructure of bottom surface of light guide plate of the present invention, arc quadrilateral or fan-shaped depression that its shape system concaves from bottom surface of light guide plate, this light reflection surface can change the path of light, whereby can usable reflection and concentration of local light, and promote the ejaculation intensity of light to the light guide plate exiting surface, promote the briliancy of light guide plate.
Description of drawings
Fig. 1 is the synoptic diagram of known light guide board microstructure;
The exiting surface bright dipping synoptic diagram of the known light guide plate of Fig. 2 (the also coordinate axis of key diagram 3);
The exiting surface of the known light guide plate of Fig. 3 a goes out the light intensity radar map;
The exiting surface of the known light guide plate of Fig. 3 b goes out the light intensity stereographic map;
Fig. 4 is laid in the synoptic diagram of light guide plate for microstructure first example of the present invention;
Fig. 5 a is the microstructure first instance constructs figure of the present invention;
Fig. 5 b is the microstructure first example top view of the present invention;
Fig. 5 c is the microstructure first example cross-section figure of the present invention;
Fig. 6 a is taken at the synoptic diagram of cross section circular conical surface for aid illustration light reflection surface of the present invention;
Fig. 6 b is taken at the side view of cross section circular conical surface for aid illustration light reflection surface of the present invention;
Fig. 7 is taken at the synoptic diagram on the face of cylinder for transparent surface after the aid illustration of the present invention;
Fig. 8 a is the synoptic diagram of light at the microstructure transfer behavior;
Fig. 8 b is the side view of light at microstructure transfer behavior one;
Fig. 8 c is the side view of light at microstructure transfer behavior two;
Fig. 8 d is the synoptic diagram of light at microstructure transfer behavior three;
Fig. 8 e is the front view of light at microstructure transfer behavior three;
Fig. 9 a goes out the light intensity radar map for the microstructure first example light guide plate bright dipping of the present invention;
Fig. 9 b goes out the light intensity stereographic map for the microstructure first example light guide plate bright dipping of the present invention;
Figure 10 is the microstructure second instance constructs figure of the present invention;
Figure 11 is microstructure the 3rd instance constructs figure of the present invention;
Figure 12 is microstructure the 4th instance constructs figure of the present invention;
The top view that Figure 13 distributes for microstructure the 5th example microstructure of the present invention;
The side view that Figure 14 distributes for microstructure the 6th example microstructure of the present invention;
The side view that Figure 15 distributes for microstructure the 7th example microstructure of the present invention;
Figure 16～Figure 21 system is an example with the present invention's first example, and microstructure of the present invention is distributed in the top view of light guide plate.
The primary clustering symbol description
1,1A, 1A1,1A2,1A3,1A4,1A5,1C, 1D light guide plate
12, the normal direction of 12A bottom surface 13 exiting surfaces
14 with lamp source vertical direction 15 and lamp source parallel direction
2 microstructures, 3 reflector plates
4 linear light sorurces, 50 incident raies
51 reflection rays, 52 refracted rays
6,61,6A, 6B, 6C, 6D, 6E, 6F microstructure
601,601A, 601B, 601C, 601D, 601E, 601F light reflection surface
602, transparent surface behind 602A, the 602B
603,604,603A, 604A, 603B, 604B, 603C, 604C, 603D, 604D side transparent surface
605,605A, 605B, 605C hollow out face
701 center lines
702,703,702A, 703A, 702D, 703D line of cut
704 circular cone centers are to the line direction of incidence point
The normal direction of 705 light reflection surfaces
8 point to the β central angle
θ elevation angle h height
R1 arc radius r2 arc radius
The α incident angle
Embodiment
See also Fig. 4, it is the synoptic diagram that microstructure 6 cloth of the present invention's first example are listed in light guide plate 1A.Wherein light is injected the incidence surface 10A of light guide plate 1A by light source 4, and microstructure 6 is arranged on bottom surface 12A and the arc-shaped recess for concaving of light guide plate 1A, and can make light penetrate exiting surface 11A, to promote the briliancy of light guide plate 1A.
See also Fig. 5, it is structural map, top view and the sectional view of microstructure 6.This microstructure 6 is an arc-shaped recess, and it comprises light reflection surface 601, back transparent surface 602, side transparent surface 603,604 and hollow out face 605.This light reflection surface 601 is a fan-shaped curved surface, other sees also Fig. 6 explanation, light reflection surface 601 is the arc curve that take out two dotted lines, 702,703 cutting backs in circular conical surface upper edge, a cross section, and the height of this cross section circular cone is h, the circular cone center O puts that the distance of peripheries is r1 to the light reflection surface 601, is r2 by circular cone center O point to the back distance of transparent surface 602 back periphery.See also Fig. 5 b, its cut coverage is from cross section circular cone center O point cutting one angle beta, and line of cut 702,703 is symmetrical in the center line 701 of microstructure 6, and promptly cutting angle β is by 701 pairs of branches of center line.Center line 701 is called as the sensing 8 of microstructure 6 toward light reflection surface 601 directions.Described side transparent surface 603,604 is for being cut the cross section of line 702,703 cuttings.Described back transparent surface 602 is an arc curve, see also Fig. 7 explanation, the arc-shaped curved surface that it is r2 that this back transparent surface 602 ties up to a radius, highly take out for two place's dotted lines, 702, the 703 cutting backs, upper edge, the face of cylinder of h, cylindrical center is identical with the position at above-mentioned circular cone center.Described hollow out face 605 is an arc, is the indent that this microstructure 6 produces on the 12A of the bottom surface of light guide plate 1A.See also Fig. 5 b, no matter from a-a tangent plane, a '-a ' tangent plane or a "-a " tangent plane observes, all can see microstructure 6 sectional views of Fig. 5 c, this is because this light reflection surface 601 is the parts of taking out from the cross section circular conical surface, back transparent surface 602 is the parts of taking out from the face of cylinder, therefore three place's sectional views are all identical, light reflection surface 601 presss from both sides an angle θ with the bottom surface 12A (being hollow out face 605 among the figure) of light guide plate 1A, the variation of this angle θ may command light reflection surface 601 influences the transfer behavior of light in microstructure 6.
See also Fig. 8, this figure is the synoptic diagram that light transmits in microstructure 6.With any direction transmission, because of this microstructure 6 forms the reason of arcs, the light of all directions is through after the microstructure in the place ahead of microstructure 6 for light, and the light path of its emergent light roughly changes not quite.Please refer to Fig. 8 a and Fig. 8 b, when the direction of incident ray 50 is close with the line direction 704 of putting incidence point from the circular cone center O, incident ray 50 is incident upon the light reflection surface 601 of microstructure 6, its incident angle α is greater than 42 ° of the critical angles (refractive index of light guide plate is 1.49) of light guide plate 1A, then reflex to the top, thereby increase the light intensity that goes out toward normal direction 13.With reference to figure 8c, as the incident angle α of incident ray 50 during less than 42 ° of the critical angles of light guide plate 1A, then light can be worn and penetrate first microstructure 6, and warp is 602 to second microstructures 61 of transparent surface later, does reflection (reflection ray 51) or wear the action of penetrating on second microstructure 61.Above-mentioned two light transfer behaviors can be increased in the light intensity that of HA direction.
Please refer to Fig. 8 d and Fig. 8 e, when the direction of incident ray 50 and the line direction 704 of putting incidence point from the circular cone center O are far away mutually, incident ray 50 arrives light reflection surface 601 backs toward side bounce-back (reflection ray 51), and this light transfer behavior can be increased in the light intensity that of VA direction.
Please refer to Fig. 9, cording has the bright dipping intensity distribution of the light guide plate 1A bright dipping of the present invention's first example microstructure 6.After the figure shows light and entering light guide plate 1A with microstructure 6 from light source 4, contact microstructure 6 is transmitted toward light direction 13, rising angle mainly concentrates on HA=25 °, VA=3 and ° locates, the elevation angle theta of microstructure 6 can change rising angle and the bright dipping distribution of light on the HA direction as can be known, and the bright dipping that central angle β can be controlled on the VA direction distributes.
Please refer to Figure 10, it is the structural map of the present invention second example microstructure 6A.This microstructure 6A is a fan structure, and it still comprises light reflection surface 601A, back transparent surface 602A, side transparent surface 603A, 604A and hollow out face 605A, the fan-shaped curved surface that light reflection surface 601A system takes out from the wedge angle circular cone.
Please refer to Figure 11, it is the structural map of the present invention the 3rd example microstructure 6B.This microstructure 6B is an arc-shaped recess, the space that this arc-shaped recess constitutes comprises light reflection surface 601B, back transparent surface 602B, side transparent surface 603B, 604B and hollow out face 605B, this light reflection surface 601B is an arc-shaped curved surface, and the light reflection surface 601B of this example microstructure 6B system is outstanding toward light guide plate 1C.Watch from light guide plate 1C toward hollow out face 605B, the light reflection surface 601B of this example microstructure is taken out by up-narrow and down-wide cross section circular conical surface, and the light reflection surface 601 of the first example microstructure 6 is to be taken out by cross section circular conical surface wide at the top and narrow at the bottom.
Please refer to Figure 12, it is the structural map of the present invention the 4th example microstructure 6C.This microstructure 6C is a fan structure, comprises light reflection surface 601C, side transparent surface 603C, 604C and hollow out face 605C, and this light reflection surface 601C is a fan-shaped curved surface, and the light reflection surface 601C of this example microstructure 6C is outstanding toward light guide plate 1D.The microstructure 6C of this example takes from the wedge angle circular cone, does not therefore have the back transparent surface.
Please refer to Figure 13, it is the present invention's the 5th example microstructure 6D top view.Observing light reflection surface 601D from the top is oval-shaped arcuation or fan-shaped.Line of cut 702D, 703D be from the focus of ellipse draw outward side transparent surface 603D, 604D, and perpendicular with the tangent line of ellipse.
Please refer to Figure 14, it is the present invention's the 6th example microstructure 6E side view, observes the curve that light reflection surface 601E is an evagination from the side.Please refer to Figure 15, it is the present invention's the 7th example microstructure 6F side view, observes the curve that light reflection surface 601F is an indent from the side.
Above-mentioned second～the 7th example is compared with first example, each example produces the different light rays transmission because of light reflection surface 601 is different with the curved surface of 601A～601F taking-up and distributes, but generally speaking, light is similar with the transfer behavior of 6A～6F in the microstructure 6 of each example, promptly all is briliancy and the uniformity coefficient that increases light guide plate.
Please refer to Figure 16～Figure 21, it is to be example with the present invention's first example, illustrates that microstructure is distributed in the top view of light guide plate.Figure 16 is the top view of Fig. 4, and this microstructure 6 presents regular distribution on light guide plate 1A, and the sensing 8 of all microstructures 6 and towards the direction of linear light sorurce 4, is injected microstructure in order to light and produced the blast phenomenon all in the same direction.
Please refer to Figure 17, described microstructure 6 presents regular distribution on light guide plate 1A1, but the sensing 8 of all microstructures 6 is in the same direction non-, but integral body, microstructure 6 has the trend of tendency towards the direction of linear light sorurce 4, injects microstructure in order to light and produces the blast phenomenon.
Please refer to Figure 18, its microstructure 6 presents random-number distribution on light guide plate 1A2, and the sensing 8 of all microstructures 6 all in the same direction, and towards the direction of linear light sorurce 4, injects microstructure in order to light and produce the blast phenomenon.
Please refer to Figure 19, its microstructure 6 presents random-number distribution on light guide plate 1A3, but the sensing 8 of all microstructures 6 is in the same direction non-, but integral body, microstructure 6 has the trend of tendency towards the direction of linear light sorurce 4, injects microstructure in order to light and produces the blast phenomenon.
Please refer to Figure 20, its microstructure 6 presents regular distribution on light guide plate 1A4, and all microstructures 6 point to 8 all or part of direction towards pointolite 41, injects microstructure in order to light and produces the blast phenomenon.
Please refer to Figure 21, its microstructure 6 presents random-number distribution on light guide plate 1A5, and the sensing 8 of all microstructures 6 has all or part of direction towards pointolite 41, injects microstructure in order to light and produces the blast phenomenon.
Among Figure 16～Figure 21, microstructure 6 can adopt wherein a kind of in the above-mentioned example or the microstructure of mixing two or more examples.And the microstructure of above-mentioned example distributes, and favourable light is injected microstructure and produced the blast phenomenon and promote briliancy, and makes light guide plate produce the bright dipping of high uniformity face type.
As mentioned above,, can improve the briliancy and the uniformity coefficient of light guide plate, improve the demonstration usefulness of LCD, with the electric quantity consumption of saving display according to the present invention.Only the present invention is described in detail, and that should understand is various changes, replaces can being carried out with replacement, is not spirit of the present invention and the scope that claim defines and do not deviate from by attached.
Claims (4)
1. the microstructure of a light guide plate, this light guide plate comprises incidence surface, exiting surface, bottom surface and light reflection surface, the light of light source enters light guide plate by incidence surface, and by exiting surface ejaculation light guide plate, its bottom surface then is positioned at the opposite face of exiting surface, this microstructure is arranged on the bottom surface, and this microstructure system is toward the depression and the crossing formation of light guide plate of light guide plate indent; Described light reflection surface is between incidence surface and exiting surface, and press from both sides an angle θ with the bottom surface of light guide plate, and the shape of this light reflection surface overlooked by exiting surface and is arc quadrilateral or fan-shaped, and this arc quadrilateral has two parallel camber line limits, and the camber line on this two camber lines limit is a concentric; It is characterized in that:
Cutting out a central angle from the side stretch-out view of a circular cone is the fan-shaped of β, described light reflection surface is from a described fan-shaped part that goes out away from a side-draw in the fan-shaped center of circle, to form the arc curve of a three-dimensional shape with described circular cone wide at the top and narrow at the bottom, the wherein said fan-shaped center of circle is near incidence surface.
2. the microstructure of light guide plate according to claim 1 is characterized in that it further comprises: a back transparent surface, be adjacent to light reflection surface, and light reflection surface is far away from the incidence surface of light guide plate relatively, and vertical with the bottom surface of light guide plate; Two side transparent surfaces are adjacent to two sides of light reflection surface, and vertical with bottom surface of light guide plate; And a hollow out face, be the interior recess of bottom surface of light guide plate.
3. the microstructure of light guide plate according to claim 1 is characterized in that: the curve that is shaped as indent that described light reflection surface side is analysed and observe.
4. the microstructure of light guide plate according to claim 1 is characterized in that: the curve that is shaped as evagination that described light reflection surface side is analysed and observe.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101183636A CN100381914C (en) | 2005-10-28 | 2005-10-28 | Microstructure of light conducting plate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101183636A CN100381914C (en) | 2005-10-28 | 2005-10-28 | Microstructure of light conducting plate |
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| CN1758074A CN1758074A (en) | 2006-04-12 |
| CN100381914C true CN100381914C (en) | 2008-04-16 |
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| CNB2005101183636A Expired - Fee Related CN100381914C (en) | 2005-10-28 | 2005-10-28 | Microstructure of light conducting plate |
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| TWI678565B (en) * | 2019-01-23 | 2019-12-01 | 誠屏科技股份有限公司 | Light guide plate and light source module |
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| CN101672948B (en) * | 2008-09-08 | 2012-08-08 | 京东方科技集团股份有限公司 | Light guide plate and backlight module with same |
| TWI408046B (en) | 2010-12-28 | 2013-09-11 | Au Optronics Corp | Backlight module, light guiding devices, and method for manufacturing light guide plate |
| CN102182964A (en) * | 2011-04-29 | 2011-09-14 | 深圳市华星光电技术有限公司 | Backlight module and liquid crystal display |
| TWI502231B (en) * | 2014-01-06 | 2015-10-01 | Au Optronics Corp | Display apparatus |
| KR20160022214A (en) * | 2014-08-18 | 2016-02-29 | (주)뉴옵틱스 | Light guide plate, backlight unit and display device having the same |
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| CN108627903A (en) * | 2017-03-17 | 2018-10-09 | 江苏日月照明电器有限公司 | A kind of light emission rate is high and smooth surface uniformly, the light guide plate of no visual spot |
| CN110275240B (en) * | 2018-03-15 | 2024-10-18 | 苏州维旺科技有限公司 | Light guide plate and backlight module |
| CN109655958B (en) * | 2018-09-13 | 2020-11-10 | 韩国高一智株式会社 | Light guide plate with concave angle shape and backlight module using same |
| CN115793133A (en) * | 2023-02-09 | 2023-03-14 | 苏州天禄光科技股份有限公司 | Side-in light guide plate with obliquely-cut cylindrical mesh points and backlight module |
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