CN101393298A - Light conducting plate and backlight module - Google Patents

Light conducting plate and backlight module Download PDF

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Publication number
CN101393298A
CN101393298A CNA2007101528221A CN200710152822A CN101393298A CN 101393298 A CN101393298 A CN 101393298A CN A2007101528221 A CNA2007101528221 A CN A2007101528221A CN 200710152822 A CN200710152822 A CN 200710152822A CN 101393298 A CN101393298 A CN 101393298A
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CN
China
Prior art keywords
plane
guide plate
light
light guide
backlight module
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CNA2007101528221A
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Chinese (zh)
Inventor
萧增科
李清祥
翁兆泓
廖俊谦
臧志仁
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Coretronic Corp
CTX Opto Electronics Corp
Original Assignee
Coretronic Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Coretronic Corp filed Critical Coretronic Corp
Priority to CNA2007101528221A priority Critical patent/CN101393298A/en
Publication of CN101393298A publication Critical patent/CN101393298A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a light guide plate and a backlight module. The light guide plate is suitable to be used in the backlight module, and is provided with a light-emitting surface, a bottom surface opposite to the light-emitting surface, and at least one light incidence surface contacting the light-emitting surface and the bottom surface, wherein the bottom surface comprises a plurality of planes and a plurality of groove groups which are alternately arranged; each groove group is provided with at least two grooves, and is provided with a first bevel, a peak part, and a second bevel which is intersected with the first bevel on the peak part; and first distance is arranged between a first end of the first bevel of each groove far away from the peak part and a second end of the corresponding second bevel far away from the peak part. The light guide plate has preferred illumination efficiency.

Description

Light guide plate and backlight module
Technical field
The present invention relates to a kind of backlight module (backlight module) and LCD (liquid crystaldisplay, LCD), and particularly relevant for a kind of be applicable to light guide plate in backlight module and the LCD (light guide plate, LGP).
Background technology
Fig. 1 is the diagrammatic cross-section of known a kind of backlight module, and Fig. 2 is the synoptic diagram of the bang path of light in the light guide plate of Fig. 1, and Fig. 3 is the rising angle of exiting surface of the light guide plate among Fig. 1 and the relativeness figure of brightness.Please refer to Fig. 1, backlight module 100 comprises light source 110, light guide plate 120 and reflector plate 130 (reflective sheet).Light source 110 is disposed at incidence surface (lightincident surface) 122 sides of light guide plate 120, and reflector plate 130 is disposed on the bottom surface 124 of light guide plate 120.The light that light source 110 is provided can enter in the light guide plate 120 via incidence surface 122, and form an area source via exiting surface (light emitting surface) 126 outgoing of light guide plate 120, to be projected to a display panels (not illustrating) that is positioned on the exiting surface 124.Reflector plate 130 can be in order to reflex to light exiting surface 126.128 of a plurality of grooves (groove) that are positioned at the bottom surface 124 of light guide plate 120 can be in order to change the bang path of light, make light can be projected to exiting surface 126, and then improve the light efficiency (luminance efficiency) of light guide plate 120 with less incident angle.
Specifically, please refer to Fig. 2, when the material of light guide plate 120 was acryl (acrylic), light was passed to air by light guide plate 120 and is about 42 degree with the critical angle that total reflection takes place.For instance, the cross sectional shape of groove 128 for example is the isometric V-types of two opposite side, and its apex angle 1For example be 90 degree.As light L 1Incident angle θ with 45 degree 1When being projected to the inclined-plane 128a of groove 128, light L 1Can total reflection take place at the inclined-plane of groove 128 128a.Then, light L 1Can be projected to exiting surface 126 with the incident angle of 0 degree, and be projected to display panels by exiting surface 126.
In addition, as light L 2Incident angle θ with 20 degree 2When being projected to the sidewall 128a of groove 128, light L 2Can be passed in the groove 128 by the sidewall 128a of groove 128.At this moment, light L 2Refraction angle θ 2aBe about 30.7 degree.Then, light L 2Can be again with the 59.3 incident angle θ that spend 2bBe projected to another sidewall 128b of groove 128, and be passed in the light guide plate 120 by another sidewall 128b of groove 128.At this moment, the refraction angle θ of light L2 2cBe about 35.1 degree.Then, light L2 can be again with the 80.1 incident angle θ that spend 2dBe projected to exiting surface 126, and total reflection take place at exiting surface 124.
In addition, as light L 3Incident angle θ with 65 degree 3When being projected to bottom surface 124, light L 3Can 124 generation total reflections in the bottom surface.Then, light L 3Can be again with the 70 incident angle θ that spend 3aBe projected to the inclined-plane 128a of groove 128, and total reflection take place at the inclined-plane of groove 128 128a.Then, light L 3Can be again with the 25 incident angle θ that spend 3bBe projected to exiting surface 126, and be projected to display panels by exiting surface 124.At this moment, light L 3Refraction angle θ 3cBe about 39.2 degree.
It should be noted that because light L 3Can have bigger refraction angle θ during by exiting surface 124 3cTherefore, after the light that light source 110 is provided formed area source by light guide plate 120, the concentration degree of light was not good.Please refer to Fig. 3, when the light that light source 110 is provided formed area source by light guide plate 120, the scope of its half angle of view (half visual angle) was between-25.792 degree are spent to 17.134.What the half angle of view of indication was represented herein is that brightness is the rising angle of a half of high-high brightness.
Summary of the invention
Light the invention provides a kind of light guide plate and a kind of backlight module of using light guide plate, so that can have preferred light efficiency after by light guide plate.
Other purposes of the present invention and advantage can be further understood from the disclosed technical characterictic of the present invention.
For reaching above-mentioned one or part or all of purpose or other purposes, one embodiment of the invention propose a kind of light guide plate, be applicable in the backlight module to have an exiting surface, an incidence surface with respect to bottom surface and at least one contact exiting surface and the bottom surface of exiting surface.The bottom surface comprises a plurality of planes (flat surface) and a plurality of groups of slots (groove group).These groups of slots and these plane alternate configurations.Each groups of slots has at least two grooves, and each groove has second inclined-plane that first inclined-plane (slanted surface), a peak portion (peak) and one and first inclined-plane intersect at peak portion.First inclined-plane of each groove away from first end (side) of peak portion and corresponding second inclined-plane away from second end of peak portion at a distance of first distance.
For reaching above-mentioned one or part or all of purpose or other purposes, the present invention also proposes a kind of backlight module, comprises an above-mentioned light guide plate and a light source.Light source is disposed at by the incidence surface of light guide plate.
Because light guide plate has a plurality of groups of slots, and each groups of slots has a plurality of grooves.Therefore, light guide plate can have preferred light efficiency, and can have preferred concentration degree by the light of exiting surface outgoing.
State feature and advantage on the present invention and can become apparent for allowing, preferred embodiment cited below particularly, and cooperate appended graphicly, be described in detail below.
Description of drawings
Fig. 1 is the diagrammatic cross-section of known a kind of backlight module.
Fig. 2 is the synoptic diagram of the bang path of light in the light guide plate of Fig. 1.
Fig. 3 is the rising angle of exiting surface of the light guide plate among Fig. 1 and the relativeness figure of brightness.
Fig. 4 is the diagrammatic cross-section of a kind of LCD of one embodiment of the invention.
Fig. 5 is the synoptic diagram of the bang path of light in the light guide plate of Fig. 4.
Fig. 6 is the rising angle of exiting surface of the light guide plate among Fig. 4 and the relativeness figure of brightness.
Fig. 7 is the structural representation of a kind of LCD of another embodiment of the present invention.
Description of reference numerals
100: backlight module
110: light source
120: light guide plate
122: incidence surface
124: the bottom surface
126: exiting surface
128: groove
128a, 128b: inclined-plane
130: reflector plate
α 1, θ 1, θ 2, θ 2a, θ 2b, θ 2c, θ 2d, θ 3, θ 3a, θ 3b, θ 3c: angle
L 1, L 2, L 3: light
200a, 200b: LCD
300: display panels
400a, 400b: backlight module
410a, 410b: light guide plate
412: exiting surface
414: the bottom surface
416: incidence surface
417: the plane
418: groups of slots
418a: groove
420: light source
430: reflex housing
440: reflector plate
450: optical diaphragm group
500: direction
α 2, θ 4, θ 5, θ 5a, θ 5b, θ 5c, θ 5d, θ 5e, θ 5f, θ 6, θ 6a, θ 6b, θ 6c: angle
D 1: spacing
D 2: difference
L 4, L 5, L 6: light
P: peak portion
S 1, S 2: the inclined-plane
W 1, W 2: distance
Embodiment
The explanation of following each embodiment is graphic with reference to what add, can be in order to the specific embodiment of implementing in order to illustration the present invention.The direction term that the present invention mentioned, for example " on ", D score, " preceding ", " back ", " left side ", " right side " etc., only be direction with reference to additional illustration.Therefore, the direction term of use is to be used for explanation, but not is used for limiting the present invention.
Fig. 4 is the diagrammatic cross-section of a kind of LCD of one embodiment of the invention, and Fig. 5 is the synoptic diagram of the bang path of light in the light guide plate of Fig. 4, and Fig. 6 is the rising angle of exiting surface of the light guide plate among Fig. 4 and the relativeness figure of brightness.Please refer to Fig. 4, LCD 200a comprises display panels 300 and backlight module 400a.Backlight module 400a is disposed at a side of display panels 300, and comprises light guide plate 410a and light source 420.
Light guide plate 410a for example is plate light guide plate.Light guide plate 410a has towards the exiting surface 412 of display panels 300, with respect to the bottom surface 414 of exiting surface 412 and at least one contact exiting surface 412 incidence surface 416 with bottom surface 414.In this embodiment, light guide plate 410a only has an incidence surface 416.Yet in other embodiments, light guide plate 410a more can have a plurality of incidence surfaces 416.Light source 420 for example is a cold cathode fluorescent lamp, and it is other that it is disposed at incidence surface 416, and can be in order to light to be provided.The light that light source 420 is provided is suitable for being entered among the light guide plate 410a by incidence surface 416, and via exiting surface 412 outgoing, to form the required area source of display panels 300.
In this embodiment, backlight module 400a also comprises reflex housing 430, reflector plate 440 and optical diaphragm group 450.It is other that reflex housing 430 is disposed at incidence surface 416, and light source 420 is between incidence surface 416 and reflex housing 430, and reflector plate 440 is disposed on the bottom surface 414.Optical diaphragm group 450 is disposed on the exiting surface 412, and between display panels 300 and light guide plate 410a, and it comprise diffusing panel, prismatic lens or brightening piece at least one of them.Reflex housing 430 can reflex to incidence surface 416 in order to the light that light source 420 is provided, so that light is entered among the light guide plate 410a by incidence surface 416.Reflector plate 440 can reflex to exiting surface 412 in order to the light that will enter among the light guide plate 410a, so that light is by exiting surface 412 outgoing, and forms the required area source of display panels 300.450 of optical diaphragm group can be in order to will be by the area source homogenising of exiting surface 412 outgoing, and can be in order to improve the brightness of area source.Below will describe structure and the feature of light guide plate 410a in detail.
Please refer to Fig. 4 and Fig. 5, the bottom surface 414 of light guide plate 410a comprises a plurality of planes 417 and a plurality of groups of slots 418.These groups of slots 418 and these plane 417 alternate configurations.Adjacent these groups of slots 418 for example are to have space D 1, and these space D 1Be along with successively decreasing away from the direction 500 of incidence surface 416.In other words, more near between the incidence surface 416 apart from D 1Can be big more, and more away between the incidence surface 416 apart from D 1Can be more little.
Each groups of slots 418 has at least two groove 418a, and each groove 418 has the first inclined-plane S 1, the P of peak portion and with the first inclined-plane S 1Intersect at the second inclined-plane S of the P of peak portion 2In other words, the cross sectional shape of each groove 418a of each groups of slots 418 can be V-type.The first inclined-plane S of each groove 418a 1Away from first end of the P of peak portion and the second corresponding inclined-plane S 2Second end away from the P of peak portion can keep first distance W 1, and can keep second distance W between adjacent these peak portions of each groups of slots 418 2In this embodiment, second distance W 2Deduct first distance W 1For example be to equal 0, in other words, these grooves 418a of each groups of slots 418 is closely adjacent.
Below will explain, and be the example explanation only with one of them of these groups of slots 418 for the bang path of light in light guide plate 410a.In this embodiment, because when entering ray cast among the light guide plate 410a to groups of slots 418, part light can be by the first inclined-plane S of left side groove 418a 1With the second inclined-plane S 2And be projected to right groove 418b.Then, these light can be at the first inclined-plane S of right groove 418b 1Total reflection taking place and be projected to exiting surface 412, and then is projected to display panels 300 by exiting surface 412.Therefore, the light guide plate 410a of present embodiment can have preferred light efficiency.
For instance, when the material of light guide plate 410a was acryl, light was passed to air by light guide plate 410a and is about 42 degree with the critical angle that total reflection takes place, and the cross sectional shape of groove 418a for example is the isometric V-types of two opposite side, and its apex angle 2(the first inclined-plane S 1With the second inclined-plane S 2Angle) for example be 90 the degree.As light L 4Incident angle θ with 45 degree 4Be projected to the first inclined-plane S of left side groove 418a 1The time, light L 4Can be at the first inclined-plane S of left side groove 418a 1Total reflection takes place.Then, light L 4Can be projected to exiting surface 412 with the incident angle of 0 degree, and be projected to display panels 300 (being illustrated in Fig. 4) by exiting surface 412.
In addition, as light L 5Incident angle θ with 20 degree 5Be projected to the first inclined-plane S of left side groove 418a 1The time, light L 5Can be by the first inclined-plane S 1And be passed among the groove 418a of left side.At this moment, the refraction angle θ of light L5 5aBe about 30.7 degree.Then, light L 5Can be again with the 59.3 incident angle θ that spend 5bBe projected to the second inclined-plane S of left side groove 418a 2, and by the second inclined-plane S 2And be passed among the light guide plate 410a.At this moment, light L 5Refraction angle θ 5cBe about 35.1 degree.Then, light L 5Can be again with the 54.9 incident angle θ that spend 5dBe projected to the first inclined-plane S of right groove 418a 1, and at the first inclined-plane S 1Total reflection takes place.Then, light L 5Can be again with the 9.9 incident angle θ that spend 5eBe projected to exiting surface 412, and be projected to display panels 300 (being illustrated in Fig. 4) by exiting surface 412.At this moment, the refraction angle θ of light L5 5fBe about 14.9 degree.
In addition, as light L 6Be parallel to light L 5, and with the 65 incident angle θ that spend 6When being projected to bottom surface 414, light L 6Can 414 generation total reflections in the bottom surface.Then, light L 6Can be again with the 70 incident angle θ that spend 6aBe projected to the first inclined-plane S of left side groove 418a 1, and at the first inclined-plane S of left side groove 418a 1Total reflection takes place.Then, light L 6Can be with the incident angle θ of 25 degree 6bBe projected to exiting surface 412, and be projected to display panels 300 (being illustrated in Fig. 4) by exiting surface 412.At this moment, light L 6Refraction angle θ 6cBe about 39.2 degree.
Light L compared to example shown in the prior art 2(see figure 2), in the present embodiment, because light L 5By can being projected to right groove 418a again behind the groove 418a of left side, and at the first inclined-plane S of right groove 418a 1Total reflection takes place and be projected to exiting surface 412.Therefore, the light guide plate 410a of present embodiment can have preferred light efficiency.
In addition, because light L 5Refraction angle θ during by exiting surface 412 outgoing 5fCan be less than light L 6Refraction angle θ during by exiting surface 412 outgoing 6c, refraction angle θ wherein 6cWith light L of the prior art 3The refraction angle θ of (see figure 2) during by exiting surface 412 outgoing 3cIdentical.Therefore, after the light that light source 420 is provided formed area source by light guide plate 410a, light can have preferred concentration degree.In other words, please refer to Fig. 6, when the light that light source 420 is provided formed area source by light guide plate 410a, the scope of its half angle of view can further narrow down to-21.824 degree between 13.166 degree.
Yet the foregoing description is not in order to limit the present invention.For instance, the apex angle of groove 418a 2(the first inclined-plane S 1With the second inclined-plane S 2Angle) be not limited in 90 the degree, can also make design optimization according to material and other design conditionss of light guide plate 410a.And, apex angle 2Optimized angle for example be more than or equal to 60 the degree and be less than or equal to 120 the degree scopes in.In addition, in other embodiments, each groups of slots 418 more can have the groove 418a of three or more quantity, and these grooves 418a can be closely not adjacent.
In addition, it is V-arrangement, prismatic, trapezoidal or other polygonal microstructures (microstructure) that the exiting surface 412 of light guide plate 410a more can have a plurality of cross sectional shapes, so that the light that light source 420 is provided can have higher brightness when forming area source by light guide plate 410a.
Fig. 7 is the structural representation of a kind of LCD of another embodiment of the present invention.Please refer to Fig. 7, the structural similarity of this LCD 200b is in the structure of the LCD 200a shown in Fig. 4, and the two difference is among the backlight module 400b of LCD 200b, and these grooves 418a of each groups of slots 418 of light guide plate 410b is not for closely adjacent.
In this embodiment, second distance W 2Deduct first distance W 1For example be to equal difference D 2And, difference D 2Divided by first distance W 1Ratio can be between 0 to 1, and its preferable range is between 0 to 0.5.
In sum, because light guide plate has a plurality of groups of slots, and each groups of slots has a plurality of grooves.Therefore, light guide plate can have preferred light efficiency, and can have preferred concentration degree by the light of exiting surface outgoing.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; those of ordinary skill in the technical field under any; 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 as the criterion when looking appended the claim person of defining.In addition, arbitrary embodiment of the present invention or claim must not reached the disclosed whole purposes of the present invention or advantage or characteristics.In addition, summary part and title only are the usefulness that is used for assisting the patent document search, are not to be used for limiting interest field of the present invention.

Claims (17)

1, a kind of light guide plate is applicable in the backlight module, has an exiting surface, an incidence surface with respect to bottom surface and this exiting surface of at least one contact and this bottom surface of this exiting surface, and wherein this bottom surface comprises:
A plurality of planes; And
A plurality of groups of slots, with these plane alternate configurations, wherein respectively this groups of slots has at least two grooves, respectively this groove have first inclined-plane, a peak portion and one and this first inclined-plane intersect at second inclined-plane of this peak portion, respectively this of this groove first inclined-plane away from first end of this peak portion and corresponding this second inclined-plane away from second end of this peak portion at a distance of first distance.
2, light guide plate as claimed in claim 1, wherein respectively this first inclined-plane of this groove is more than or equal to 60 degree with the angle on corresponding this second inclined-plane and is less than or equal to 120 degree.
3, light guide plate as claimed in claim 1, wherein respectively the second distance between wantonly two of this groups of slots adjacent these peak portions to deduct this first be more than or equal to 0 and less than 1 apart from a difference of gained divided by the ratio of this first distance.
4, light guide plate as claimed in claim 1, wherein respectively the second distance between wantonly two of this groups of slots adjacent these peak portions to deduct this first be more than or equal to 0 and less than 0.5 apart from a difference of gained divided by the ratio of this first distance.
5, light guide plate as claimed in claim 1, wherein wantonly two adjacent these groups of slots are at a distance of a spacing, and these spacings are along with successively decreasing away from the direction of this incidence surface.
6, light guide plate as claimed in claim 1 is a plate light guide plate.
7, a kind of backlight module comprises:
One light guide plate has an exiting surface, an incidence surface with respect to bottom surface and this exiting surface of at least one contact and this bottom surface of this exiting surface, and wherein this bottom surface comprises:
A plurality of planes; And
A plurality of groups of slots, with these plane alternate configurations, wherein respectively this groups of slots has at least two grooves, respectively this groove have first inclined-plane, a peak portion and one and this first inclined-plane intersect at second inclined-plane of this peak portion, respectively this of this groove first inclined-plane away from first end of this peak portion and corresponding this second inclined-plane away from second end of this peak portion at a distance of first distance; And
One light source is disposed at by this incidence surface.
8, backlight module as claimed in claim 7, wherein respectively this first inclined-plane of this groove is more than or equal to 60 degree with the angle on corresponding this second inclined-plane and is less than or equal to 120 degree.
9, backlight module as claimed in claim 7, wherein respectively the second distance between wantonly two of this groups of slots adjacent these peak portions to deduct this first be more than or equal to 0 and less than 1 apart from a difference of gained divided by the ratio of this first distance.
10, backlight module as claimed in claim 7, wherein respectively the second distance between wantonly two of this groups of slots adjacent these peak portions to deduct this first be more than or equal to 0 and less than 0.5 apart from a difference of gained divided by the ratio of this first distance.
11, backlight module as claimed in claim 7, wherein wantonly two adjacent these groups of slots are at a distance of a spacing, and these spacings are along with successively decreasing away from the direction of this incidence surface.
12, backlight module as claimed in claim 7, wherein this light guide plate is a plate light guide plate.
13, backlight module as claimed in claim 7, wherein this light source comprises a cold cathode fluorescent lamp.
14, backlight module as claimed in claim 7 comprises that also one is disposed at the optical diaphragm group on this exiting surface.
15, backlight module as claimed in claim 14, wherein this optical diaphragm group comprise a diffusing panel, a prismatic lens and a brightening piece at least one of them.
16, backlight module as claimed in claim 7 comprise that also one is disposed at the other reflex housing of this incidence surface, and this light source is between this incidence surface and this reflex housing.
17, backlight module as claimed in claim 7 comprises that also one is disposed at the reflector plate on this bottom surface.
CNA2007101528221A 2007-09-18 2007-09-18 Light conducting plate and backlight module Pending CN101393298A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNA2007101528221A CN101393298A (en) 2007-09-18 2007-09-18 Light conducting plate and backlight module

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Application Number Priority Date Filing Date Title
CNA2007101528221A CN101393298A (en) 2007-09-18 2007-09-18 Light conducting plate and backlight module

Publications (1)

Publication Number Publication Date
CN101393298A true CN101393298A (en) 2009-03-25

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CNA2007101528221A Pending CN101393298A (en) 2007-09-18 2007-09-18 Light conducting plate and backlight module

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102213398A (en) * 2010-04-08 2011-10-12 中强光电股份有限公司 Light guide plate and light source module
US8529116B2 (en) 2010-04-06 2013-09-10 Coretronic Corporation Light guide plate and light source module

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8529116B2 (en) 2010-04-06 2013-09-10 Coretronic Corporation Light guide plate and light source module
CN102213398A (en) * 2010-04-08 2011-10-12 中强光电股份有限公司 Light guide plate and light source module
CN102213398B (en) * 2010-04-08 2013-03-06 中强光电股份有限公司 Light guide plate and light source module

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