CN101619825A - Backlight module for reducing light leakage - Google Patents

Backlight module for reducing light leakage Download PDF

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Publication number
CN101619825A
CN101619825A CN200910161144A CN200910161144A CN101619825A CN 101619825 A CN101619825 A CN 101619825A CN 200910161144 A CN200910161144 A CN 200910161144A CN 200910161144 A CN200910161144 A CN 200910161144A CN 101619825 A CN101619825 A CN 101619825A
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CN
China
Prior art keywords
backlight module
inner concave
module according
lgp
sidewall
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Pending
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CN200910161144A
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Chinese (zh)
Inventor
彭赐光
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AU Optronics Corp
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AU Optronics Corp
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Application filed by AU Optronics Corp filed Critical AU Optronics Corp
Priority to CN200910161144A priority Critical patent/CN101619825A/en
Publication of CN101619825A publication Critical patent/CN101619825A/en
Priority to CN2010102133141A priority patent/CN101922689B/en
Pending legal-status Critical Current

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Abstract

The invention discloses a backlight module which comprises an outer frame and a light guide plate. The outer frame comprises a bottom plane and a side wall, wherein the side wall is arranged along the edge of the bottom plane and surrounds a setting space; the side wall comprises an inner concave surface and an outer surface facing to the setting space, and the more the part of the inner concave surface approaches the bottom plane, the more the part approaches the outer surface; the light guide plate is arranged on the bottom plane and positioned in the setting space; and the inner concave surface is sunk to the outer surface and clamps a sinking space with the side of the light guide plate.

Description

Reduce the backlight module of light leak
Technical field
The present invention is about a kind of backlight module; Particularly a kind of backlight module that comprises light emitting diode.
Background technology
Two-d display panel and use the flat display apparatus of two-d display panel becomes the main flow of all kinds of display unit gradually.Wherein, panel of LCD is the main flow of present flat display apparatus, and is used in the electronic products such as display screen of flat-plate type monitor, mobile phone and digital camera of flat-surface television, PC and the kneetop computer of various panel display screen, family expenses in large quantities.
Backlight module (Back Light Module) is one of vital part in the present panel of LCD.Because liquid crystal itself is not luminous, so the function of backlight module is brightness that provides sufficient and the light source that is evenly distributed, so that panel of LCD show image normally.
Figure 1 shows that the profile of known display unit.As shown in Figure 1, known display unit 10 comprises display floater 11, optical diaphragm group 12, LGP 13, reflector plate 14 and housing 15.Optical diaphragm group 12, LGP 13 and reflector plate 14 are stacked and placed on respectively among the housing 15.Optical diaphragm group 12 comprises blooming pieces such as reflecting polarized wafer shape brightness enhancement film, diffusion sheet or prismatic lens, for accepting and handle the light that penetrates from LGP 13.In addition, display unit 10 shown in Figure 1 comprises light source (not illustrating) in addition, is arranged at the side of LGP 13 and launches light into LGP 13.As shown in Figure 1, comprise first light 16 and second light 17 among the LGP 13, wherein first light 16 is reflected after penetrating from LGP 13 bottoms, and sheet 14 disperses and formation diffusion light.First light 16 that the sheet 14 that is reflected disperses will be marching to display floater 11 through after the optical diaphragm group 12, to provide the enough brightness of display floater with display frame.
Yet as shown in Figure 1, second light 17 carries out the move mode of total reflection and finally penetrates and be contacted with housing 15 from the side of LGP 13 among LGP 13.Because housing 15 has light reflective, therefore second light 17 will penetrate from the lateral margin of display floater 11 corresponding to housing 15 because of the reflection of housing 15.Thus, second light 17 that penetrates from LGP 13 sides all will finally concentrate on the lateral margin of display floater 11 because of the reflection of housing 15, also therefore form bright line and will influence the attractive in appearance of known display unit 10 overall images at the lateral margin of display floater 11.
Summary of the invention
Purpose of the present invention can be used for reducing the degree of display module edge light leak (LightLeakage) for a kind of backlight module is provided.
Backlight module of the present invention comprises housing and LGP, and wherein housing comprises base plane and sidewall.Sidewall is arranged at the edge of base plane and impales one the space is set, for LGP or optical diaphragm group are set.Sidewall comprises in fact in the face of the inner concave and the opposed outer surface of space and LGP side are set, wherein inner concave the closer to the part of base plane the closer to outer surface.In addition, inner concave and LGP side press from both sides a dented space, wherein inner concave the closer to the part of base plane the closer to outer surface.In other words, the width of dented space is along with dented space increases when base plane is close and gradually.In one embodiment, inner concave is the arc inner concave, but is not limited thereto; In different embodiment, that inner concave also has is stepped, zigzag or other suitable shapes.
For above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, preferred embodiment cited below particularly, and cooperate appended accompanying drawing, be described in detail below.
Description of drawings
By reference above stated specification and following accompanying drawing, technical characterictic of the present invention and advantage are obtained to be understood fully.
Figure 1 shows that the profile of known display unit;
Figure 2 shows that the exploded view of backlight module of the present invention;
Figure 3 shows that the profile of backlight module of the present invention;
Figure 4 shows that ellipse corresponding to inner concave shown in Figure 3, wherein the cross sectional shape of inner concave corresponding to disciform one with reference to circumference;
Figure 5 shows that another embodiment of backlight module of the present invention, wherein inner concave is a tapered plane;
Figure 6 shows that another embodiment of backlight module of the present invention, wherein inner concave has stepped; And
Figure 7 shows that another embodiment of backlight module of the present invention, wherein inner concave has Fresnel serrated surface structure.
Wherein, Reference numeral
100 backlight modules, 500 dented space
110 light sources 600 are with reference to oval
200 housings, 610 semi-major axis
210 base plane, 620 semi-minor axis
211 are provided with space 630 with reference to circumference
220 sidewalls, 631 first reference points
221 end faces, 632 second reference points
222 inner concaves, 820 sawtooth
223 outer surface A light
224 top point B angles
225 bottom point C thickness
226 ladder-shaper structure D eccentric distances
300 LGP H height
400 optical diaphragm group W width
410 reflector plates
The specific embodiment
The present invention is about a kind of backlight module; Particularly a kind of side light type back light module.The present invention changes the shape of housing inner concave and structure with the light reflected back LGP that penetrates from the LGP side; This light will be convert a diffusion light to after optical treatment, for the display floater display frame of display unit.In other words, the present invention reclaims the light that self-conductance tabula rasa side penetrates about shape and the structure by change housing inner concave, and reduces the light leak degree of display unit edge bright band whereby.
Fig. 2 and exploded view and the profile that is respectively backlight module 100 of the present invention shown in Figure 3.As shown in Figure 2, backlight module 100 of the present invention comprises light source 110, housing 200, LGP 300, optical diaphragm group 400 and reflector plate 410, and wherein housing 200 comprises base plane 210 and sidewall 220 in addition, but is not limited thereto; In different embodiment, the also available reflector plate 410 of the base plane 210 of housing 200 replaces.In other words, reflector plate 410 can be attached at the bottom of sidewall 220 and save the material of base plane 210 whereby.As shown in Figure 2, sidewall 220 extensions are arranged at the edge of base plane 210 and impale space 211 is set, for holding light source 110, LGP 300, optical diaphragm group 400 and reflector plate 410.In addition, reflector plate 410 is arranged on the base plane 210, and light source 110 and LGP 300 are arranged on the reflector plate 410, and optical diaphragm group 400 is arranged on the LGP 300.In the present embodiment, backlight module 100 is a side light type back light module, and wherein light source 110 is arranged at the side of LGP 300, but is not limited thereto.The light source 110 of present embodiment is a light-emitting diode light bar (Light Emitting Diode Bar), but is not limited thereto; In different embodiment, light source 110 also comprises cathode fluorescent tube (Cold CathodeFluorescent Lamp) or other suitable light sources.In addition, optical diaphragm group 400 of the present invention is used to accept the light that penetrates from LGP 300 and adjusts the intensity uniformity of light or other characteristics and convert light to diffusion light by optical treatment.The optical diaphragm group 400 of present embodiment comprises diffusion sheet (Diffuser) and brightness enhancement film (Brightness Enhance Film), but is not limited thereto; Optical diaphragm group 400 also can comprise polarisation conversion film, reflecting type polarizing type brightness enhancement film or other suitable blooming pieces.
Figure 3 shows that the profile of backlight module of the present invention.As shown in Figure 3, sidewall 220 comprises end face 221, inner concave 222 and outer surface 223, and wherein inner concave 222 extends to the direction of base plane 210 in the face of LGP 300 and from end face 221 in fact.In addition, inner concave 222 accompanies dented space 500 with the side of LGP 300, wherein the width W of dented space 500 along with dented space 500 when base plane 210 is close and increase gradually.In other words, inner concave 222 falls into to outer surface 223 more the closer to the part of base plane 210.In the present embodiment, the height H of dented space 500 is greater than the thickness of LGP 300, but is not limited thereto; Height H also can equal the thickness of LGP 300.In different embodiment, height H can be made amendment according to the radian of inner concave 222, position or other factors of end face 221.In addition, in the embodiment shown in fig. 3, the section various piece or the different paragraph of inner concave 222 have different slopes and radian respectively.In other words, the slope of the inner concave 222 of present embodiment and radian be corresponding to a disciform part edge, but be not limited thereto; In different embodiment, slope and radian that inner concave 222 can have other suitable pattern (as positive circle) according to demand, dented space 500 required sizes or other factors of the thickness of LGP 300, technology withdrawing pattern.
In the embodiment shown in fig. 3, the ratio of the height H of dented space 500 and LGP 300 thickness is preferably 1.6, but is not limited thereto; In different embodiment, aforementioned proportion is optionally in fact between 1 to 2.In other words, be C as the thickness of LGP 300, the proportionate relationship of the height H of LGP 300 thickness and dented space 500 can be represented by equation (1):
1<H/C<2 (1)
In addition, the ratio between the height H of the width W of present embodiment and dented space 500 is essentially 0.2, but is not limited thereto; In different embodiment, this ratio is optionally implemented between 0.1 and 0.3.In other words, the relation between width W and the height H can be narrated by following equation (2):
0.1<W/H<0.3 (2)
In addition, end face 221 is preferable greater than the height of optical diaphragm group 400 with respect to base plane 210 with respect to the height of base plane 210.In this embodiment, a display floater (as display panels) can be arranged on the end face 221 but can therefore not touch optical diaphragm group 400.
In addition, in the embodiment shown in fig. 3, inner concave 222 forms the cross sectional shape of a cambered surface and inner concave 222 corresponding to a radian and a length with reference to oval-shaped part circumference.Figure 4 shows that above-mentioned schematic diagram with reference to ellipse 600.Comprise semi-major axis 610 and semi-minor axis 620 with reference to ellipse 600, wherein 620 extended line segments of semi-major axis 610 and semi-minor axis were cut with reference to oval 600 respectively and were intercepted one with reference to circumference 630.In other words, the reference circumference 630 of present embodiment is the circumference with reference to oval 600 just positive 1/4th.In the embodiment shown in fig. 3, the cross sectional shape of inner concave 222 is corresponding at least a portion of reference circumference 600; Particularly, the radian of inner concave 222 is to the arc of small part correspondence with reference to circumference 630 parts.As shown in Figure 3, when light A penetrates from the side of LGP 300 and is contacted with inner concave 222, light A will be reflexed to reflector plate 410 by inner concave 222.To be reflected sheet 410 reflections and move to optical diaphragm group 400 of part light A, another part light A then is not broken to a plurality of light that move to optical diaphragm group 400 diverse locations by the site of LGP 300 bottoms (illustrating).In other words, the light A that penetrates from LGP 300 sides will be recycled to LGP 300 and be converted into diffusion light by the reflection mode by inner concave 222; Backlight module 100 of the present invention whereby reclaims light A in the reflection mode and has increased the overall brightness and the energy use efficiency of backlight module 100.
In addition, in Fig. 3 and embodiment shown in Figure 4, the height of dented space 500 equals the length of semi-major axis 610 in fact; The width of dented space 500 equals the length of semi-minor axis 620, but is not limited thereto; In different embodiment, the width that the height of dented space 500 also can be different from the length of semi-major axis 610 or dented space 500 also can be different from the length of semi-minor axis 620.In addition, as shown in Figure 3, inner concave 222 comprises top point 224 and bottom point 225, corresponds respectively to reference to first reference point 631 on the circumference 630 and second reference point 632.In other words, the line segment that comprises between first reference point 631 and second reference point 632 will be as the foundation of the inner concave 222 that forms sidewall 220.In the present embodiment, first reference point 631 and second reference point 632 are defined in the two ends with reference to circumference 630 respectively, and in other words, the cross sectional shape of present embodiment inner concave 222 is corresponding to reference to oval 600 positive 1/4th circumference, but is not limited thereto.In different embodiment, first reference point 631 and second reference point 632 also optionally are defined in reference to wantonly 2 two points on the circumference 630; Whereby, first reference point 631 and second reference point 632 optionally intercept any part with reference to the line segment of circumference 630 with as the foundation that forms inner concave 222.In addition, as shown in Figure 4, folder one eccentric distance D between second reference point 632 and the semi-minor axis 620.In the present embodiment, eccentric distance D is preferably less than 1/8th (0.125) of height H shown in Figure 3, but is not limited thereto.
Figure 5 shows that another embodiment of backlight module of the present invention.As shown in Figure 5, the inner face of partial sidewall 220 protrudes to LGP 300, and wherein inner concave 222 extends to base plane 210 from the bottom of this projection.In addition, the inner concave 222 of present embodiment connects institute by a plurality of tapered planes and forms, and wherein the angle of inclination of each tapered plane is all different, wherein inner concave 222 on the direction of extending to base plane 210 simultaneously to outer surface 223 depressions and formation dented space 500.In other words, inner concave 222 caves in to outer surface 223 more the closer to the part of base plane 210.In addition, between inner concave 222 and the base plane 210 one on folder less than 90 ° included angle B.Because inner concave 222 favours reflector plate 410 simultaneously, therefore inner concave 222 can near small part reflex to reflector plate 410 from the light of LGP 300 sides ejaculation, and the LGP that described light is reflexed to of reflector plate 410 also makes described light penetrate from optical diaphragm group after treatment whereby.In the present embodiment, above-mentioned included angle B is 60 °, but is not limited thereto; In different embodiment, included angle B also can be adjusted according to the distance between thickness, inner concave 222 and the base plane 210 of the gradient of the demand of housing 200 withdrawing pattern when the manufacture process, inner concave 222, LGP 300, required size or other factors of dented space 500.
Figure 6 shows that another embodiment of backlight module 100 of the present invention.As shown in Figure 6, inner concave 222 has stepped and is made up of a plurality of ladder-shaper structure 226.In the present embodiment, ladder-shaper structure 226 extends to base plane 210 from end face 221, and wherein the bearing of trend of ladder-shaper structure 226 is approximate corresponding to a disciform curved edge, but is not limited thereto; In different embodiment, the bearing of trend of trapezoidal-structure 226 also can have other the gradient or radian or corresponding to the radian of other figures (as circle).The ladder-shaper structure 226 of close base plane 210 is near outer surfaces 223.In the present embodiment, part will finally contact the surface of ladder-shaper structure 226 and be reflexed to reflector plate 410 by ladder-shaper structure 226 from the emitted light of LGP 300 sides, and described light will be reflected onto LGP 300 afterwards and penetrate from optical diaphragm group 400 after the process optical treatment.In addition, the ladder-shaper structure 226 of present embodiment all has equal widths and height, but is not limited thereto; In different embodiment, the number of ladder-shaper structure 226 and individual other width and height can be adjusted according to the required integral inclination degree of inner concave 222, housing 200 demand or other factors of withdrawing pattern when the manufacturing process.In the present embodiment, ladder-shaper structure 226 can be considered the projection that protrudes out from inner concave 222, and in addition, the ladder-shaper structure 226 of present embodiment successively decreases to base plane 210 from end face 221 from the height that inner concave 222 stretches out, but is not limited thereto; In different embodiment, above-mentioned ladder-shaper structure 226 also can have identical height.In addition, ladder-shaper structure 226 is parallel to the width of LGP 300 bearing of trends or base plane 210 also for equating; But in different embodiment, the width of above-mentioned ladder-shaper structure 226 also can be from end face 221 to base plane 210 increasing or decreasings.
Figure 7 shows that another embodiment of backlight module of the present invention, wherein inner concave 222 has Fresnel (Fresnel) surface texture.As shown in Figure 7, inner concave is provided with a plurality of sawtooth 820, and the size of each sawtooth 820 is equal, but is not limited thereto; In different embodiment, sawtooth 820 also can have different size.In addition, in the present embodiment, the bearing of trend of sawtooth 820 extends to base plane 210 from end face 221 with the direction of tool radian, and wherein the radian of above-mentioned bearing of trend is corresponding to the radian of an ellipse part edge, but is not limited thereto; In different embodiment, the radian of the bearing of trend of sawtooth 820 also can be made amendment corresponding to the edge of other figures (as circle).In the embodiment shown in fig. 7, sawtooth 820 also has the inclined-plane 800 of facing base plane 210 in fact, the light B that wherein partly penetrates and be contacted with inclined-plane 800 from LGP 300 sides will be reflected back toward LGP 300 and reflector plate 410, and final light B will destroy and penetrate from the side of optical diaphragm group 400 with respect to LGP after being converted into diffusion light.In addition, please be simultaneously with reference to Fig. 6 and Fig. 7, the projection of ladder-shaper structure 226 wherein shown in Figure 6 for having orthogonal cross-section.Sawtooth 820 shown in Figure 7 has the projection of acute angle section, and wherein the angle that had of sawtooth 820 sections of present embodiment is 60 °, but is not limited thereto; In different embodiment, the section of sawtooth 820 also can have less than 90 ° acute angle or greater than 90 ° obtuse angle.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.

Claims (14)

1. a backlight module is characterized in that, comprises:
One housing comprises a sidewall, impales one the space is set, and this sidewall comprises an inner concave and the corresponding outer surface that the space is set towards this in fact, wherein this inner concave the closer to this sidewall bottom part the closer to this outer surface; And
One LGP is arranged in this space is set; Wherein this inner concave presss from both sides a dented space to this outer surface depression and with a side of this LGP.
2. backlight module according to claim 1, it is characterized in that, this inner concave is the arc inner concave, the cross sectional shape of this inner concave is corresponding to one oval-shaped one at least a portion with reference to circumference, this ellipse comprises a semi-major axis and a semi-minor axis, this semi-major axis and this semi-minor axis were cut this ellipse respectively intercepting this with reference to circumference, and the height of this dented space is in fact less than the length of this semi-major axis, and the width of this dented space is in fact less than the length of this semi-minor axis.
3. backlight module according to claim 2 is characterized in that, this inner concave comprises a top point and bottom point, corresponds respectively to this with reference to the point of two on the circumference, and this bottom point and this semi-minor axis are at a distance of one first eccentric distance.
4. backlight module according to claim 3 is characterized in that, this first eccentric distance is equal to or less than the height 1/8th of this dented space in fact.
5. backlight module according to claim 1 is characterized in that, the height of this dented space and the ratio between width are in fact between 0.1 to 0.3.
6. backlight module according to claim 1 is characterized in that, the ratio of the height of this dented space and the thickness of this LGP is in fact less than 2 and in fact greater than 1.
7. backlight module according to claim 1 is characterized in that this inner concave has stepped.
8. backlight module according to claim 1 is characterized in that, further comprises a plurality of projections, is arranged on this inner concave, and wherein said projection successively decreases to this sidewall bottom part from the end face of this sidewall from the height that this sidewall stretches out.
9. backlight module according to claim 8 is characterized in that, described projection increases progressively to this base plane from the end face of this sidewall perpendicular to the width of this LGP.
10. backlight module according to claim 8 is characterized in that, the width that described projection is parallel to this LGP increases progressively to this sidewall bottom part from the end face of this sidewall.
11. backlight module according to claim 8 is characterized in that, presss from both sides one between the described projection respectively at interval, this width at interval optionally equates or is unequal.
12. backlight module according to claim 8 is characterized in that, each described projection has an acute angle part, is arranged at the top of described projection, and this acute angle part further comprises an inclined-plane of facing this LGP in fact.
13. backlight module according to claim 1 is characterized in that, this inner concave has Fresnel serrated surface structure.
14. backlight module according to claim 13 is characterized in that, this inner concave comprises a plurality of sawtooth portion, and each this sawtooth portion comprises an inclined-plane, this inclined-plane the closer to the part of this sidewall bottom part the closer to this outer surface.
CN200910161144A 2009-08-06 2009-08-06 Backlight module for reducing light leakage Pending CN101619825A (en)

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CN2010102133141A CN101922689B (en) 2009-08-06 2010-06-23 Backlight module for reducing light leakage

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CN103292211A (en) * 2012-08-21 2013-09-11 厦门天马微电子有限公司 Backlight module of liquid crystal display and liquid crystal display
CN103744217A (en) * 2014-01-26 2014-04-23 北京京东方光电科技有限公司 Backlight module and display device
WO2014173032A1 (en) * 2013-04-22 2014-10-30 北京京东方光电科技有限公司 Liquid crystal display module and package structure thereof
CN105807489A (en) * 2016-05-06 2016-07-27 奥英光电(苏州)有限公司 Backlight source module, liquid-crystal display device and mobile terminal
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DE112011104968B4 (en) * 2011-02-25 2019-08-08 Shenzhen China Star Optoelectronics Technology Co., Ltd. Brilliant light guide plate assembly and backlight module
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DE112011104968B4 (en) * 2011-02-25 2019-08-08 Shenzhen China Star Optoelectronics Technology Co., Ltd. Brilliant light guide plate assembly and backlight module
CN103292211A (en) * 2012-08-21 2013-09-11 厦门天马微电子有限公司 Backlight module of liquid crystal display and liquid crystal display
CN103292211B (en) * 2012-08-21 2016-12-21 厦门天马微电子有限公司 LCD backlight module and liquid crystal display
WO2014173032A1 (en) * 2013-04-22 2014-10-30 北京京东方光电科技有限公司 Liquid crystal display module and package structure thereof
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CN105807489A (en) * 2016-05-06 2016-07-27 奥英光电(苏州)有限公司 Backlight source module, liquid-crystal display device and mobile terminal
CN108490530A (en) * 2018-03-26 2018-09-04 京东方科技集团股份有限公司 A kind of ultra-narrow frame module and a kind of liquid crystal display device
CN110346964A (en) * 2018-04-02 2019-10-18 夏普株式会社 Display device

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