CN106842411A - A kind of thin type light guide structure - Google Patents

A kind of thin type light guide structure Download PDF

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Publication number
CN106842411A
CN106842411A CN201710248221.4A CN201710248221A CN106842411A CN 106842411 A CN106842411 A CN 106842411A CN 201710248221 A CN201710248221 A CN 201710248221A CN 106842411 A CN106842411 A CN 106842411A
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China
Prior art keywords
light guide
fillet
light
guide plate
angle
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CN201710248221.4A
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Chinese (zh)
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CN106842411B (en
Inventor
徐胜
郭太良
陈恩果
叶芸
黄佳敏
缪煌辉
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Fuzhou University
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Fuzhou University
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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0018Redirecting means on the surface of the light guide
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/002Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0031Reflecting element, sheet or layer

Abstract

The present invention relates to a kind of thin type light guide structure, including incident light source, incident side optical coupling structure and light guide structure main body, the light guide structure main body includes light guide plate, the incident side optical coupling structure includes being arranged on the upper fillet surface and lower fillet surface of light guide plate leading section, the angle of the upper fillet surface and lower fillet surface is α, lower fillet surface is β with the angle of light guide plate lower surface extended line, the line of lower fillet surface lower extreme point and upper fillet surface upper extreme point, the line is θ 3 with the angle of light guide plate surface normal, the light guide plate leading section is light guide plate short side place, the underface of the tilting fillet surface under light guide plate of the incident light source, gap side between incident light source and lower fillet surface is posted and reduces the reflector plate that light spills.This structure can effectively reduce light guide plate.

Description

A kind of thin type light guide structure
Technical field
The present invention relates to a kind of thin type light guide structure.
Background technology
In recent years, lcd technology is gradually replaced because its small product size is frivolous, occupy little space, radiate low advantage For traditional cathode-ray tube displaying technology, the main flow of flat panel display product is occupied.LCD (liquid crystal display device) is a kind of Non-spontaneous optical display unit.Backlight module as LCD light source supplier, the quality of its performance directly affects the imaging matter of display Amount, is the important component of LCD.And the medium that light guide plate is propagated as light in backlight module, the arrangement of its site, profile knot Structure and material properties determine viewing area brightness, uniformity and the light efficiency of backlight.Light guide plate optimizes design to drop Low cost of manufacture, improves phenomenon quality and plays an important role.Thus, the optimizing research to backlight light guide structure is conducive to improving LCD total qualities, reduction cost of manufacture, have certain guidance to act on actual production.
Backlight module can be divided into straight-down negative and the class of side entering type two by the position difference according to light source.In downward back optical mode In group, light source is located at immediately below exiting surface.Light by the diffusion of diffuser plate and mixed light effect after, in the form of uniform area light source Outgoing.Since it is desired that one section of light mixing distance, straight-down negative module is Comparatively speaking thicker;In side entrance back module, light source is located at Light guide plate side or many sides, the light entered from side are referred to as area source by the modulating action of light guide plate.With respect to straight-down negative For backlight, side-edge type backlight possesses light weight, slim, low power consumption characteristic.Although direct LED backlight color rendition The good but relatively costly, optical uniformity of property is poor.Thus, LED side-edge type backlights are used current small-medium size backlight module more.
It is concentrated mainly in the structure design of module and light guide plate design for the research of side entering-type LED backlight module. In the production technology of side entrance back module, it is reduces cost, the thickness of reduction backlight module, improves the light source utilization of backlight Rate and light guide plate viewing area go out optical property, need to back light module unit structure and light guide plate design be updated.In backlight module In structure, for improve light-out effect constantly with reflectance coating, diffusion barrier, reflection side film, reflection cavity and light guide plate surface frosted etc. Technology is combined so that design of backlight module is more complicated, and production technology is also more cumbersome, reduces production efficiency, certain journey The production cost of backlight module is increased on degree.
To improve the efficiency of light energy utilization, while further realizing the slimming of liquid crystal display, many researchers are to backlight mould Light conducting plate structure and blooming piece are studied in group.Zhang Zhi is big to wait the light conducting plate structure for proposing that splicing rhombus light source is underlying, The light of light source can be made equably to be projected via light guide plate, lift overall brightness uniformity, solve existing backlight mould The problem of group brightness unevenness caused by slimming.Guo Wei etc. proposes that the incidence surface of light guide plate is circular arc, and the light guide plate Upper surface and lower surface on be respectively provided with the first inclined-plane and the second inclined-plane near the side of incidence surface.Improve light utilization Rate, improves light coupling efficiency.Therefore in the case where light coupling efficiency not being lost, can be by the leaded light of light guide plate The thickness in portion is made thinner, is conducive to the slimming of light guide plate to design.And they also propose that the light incident sides of light guide plate are upper and lower Combination forms the sphenoid that bell shape is presented, this thickness for being designed to effectively reduce light guide plate, to meet liquid crystal The requirement of showing device slimming.Huang Ping Le etc. proposes the optimization study of light guide plate mesh point averag density scope, improves net The efficiency of point optimization design.In order to couple light energy as much as possible is to improve light utilization, the LED light source used in research Cross-sectional width is respectively less than light guide plate.Because as long as LED light source cross-sectional width is more than light guide plate, light source luminous energy just has one Part can not be entered into light guide plate, so not only cause capacity usage ratio lowly, and light leakage phenomena occurs, influenceed Contrast.It means that the thickness of light guide plate can not be with the slimming of light guide plate in traditional side entering-type LED backlight module It is required that infinitely diminishing.The further slimming of light guide plate has been substantially subjected to light emitting source cross-sectional width in side entering type liquid crystal display Restriction, i.e., on the premise of light efficiency and contrast is ensured, the thickness of light guide plate must be bigger than light emitting source cross-sectional width.
In view of this, existing liquid crystal display (LCD) backlight module is made using side entering type light emitting diode (LED) mostly It is backlight, it requires that light guide plate consistently greater than LED lights cross-sectional width.According to such case so as to propose a kind of use The light conducting plate structure design in side entering-type LED backlight module.
The content of the invention
The present invention makes improvement for the problem that above-mentioned prior art is present, i.e., the technical problems to be solved by the invention are A kind of thin type light guide structure is provided, is changed from LED incident side structures, in order to not reduce the dimensional thickness of LED, will be original The LED of vertical type reclines and is had a certain degree with light guide plate bottom surface.The module is carried out using geometric algorithm and optical principle Design, enables incident side light guide plate to form specific geometry and is totally reflected into major part in the middle of light guide plate by light. The light energy utilization ratio of light guide plate of the structure is significantly improved relative to the light guide plate of traditional structure, while also achieving leaded light The purpose of plate slimming.
In order to solve the above-mentioned technical problem, the technical scheme is that:A kind of thin type light guide structure, including incident light Source, incident side optical coupling structure and light guide structure main body.The light guide structure main body includes light guide plate, the main material of light guide plate It is PMMA resins, the total reflection angle of the light guide plate of the material is 43 °, and the incident side optical coupling structure includes being arranged on leaded light The angle of the upper fillet surface in front edge of board portion and lower fillet surface, the upper fillet surface and lower fillet surface is α, lower fillet surface and light guide plate The angle of lower surface extended line is β, the line of lower fillet surface lower extreme point and upper fillet surface upper extreme point, the line and light guide plate upper table The angle of face normal is θ 3, and the light guide plate leading section is light guide plate short side place.The incident light source is tilting under light guide plate The underface of fillet surface, the gap side between incident light source and lower fillet surface is posted and reduces the reflector plate that light spills.This is new Type structure is meeting the efficient utilization rate situation of light by adjusting the thickness and α, β angle and specific structure of light guide plate Under light guide plate is reduced thickness as far as possible.
Further, the incident light source and the spacing of lower fillet surface are 0.1mm, and the width of lower fillet surface is more than or equal to The width of incident light source, allows light to enter into light guide plate the inside as far as possible, and the linear type of incident light source is evenly spaced in down The underface of fillet surface.
Further, the lower fillet surface is light is refracted into the beveling plane of light guide plate or to make light-ray condensing Convex lens or to make the concavees lens of divergence of beam or being the free form surface for making light be totally reflected in light guide plate.
Further, to enable the light for reflexing to lower fillet surface and light guide plate lower surface from upper fillet surface that full hair to occur Penetrate, the upper fillet surface is beveling plane, convex lens, concavees lens or free form surface.The utilization rate of light is improved as far as possible.
Further, in the design of upper fillet surface, the light of fillet surface not necessarily reaches the angle of total reflection in arrival, is The light is reflexed to light guide plate, reflector layer is configured with the upper fillet surface.
Further, light is directly mapped to the normal of light guide plate upper surface, light and light guide plate upper surface from lower fillet surface Angle need to be more than or equal to angle of total reflection θEntirely, the angles of the θ 3 determine by following formula:
θ3≥θEntirely=43°。
Further, the angle of the β is defined to 0 °≤β<43°.
Further, the upper fillet surface is determined with the angle α of lower fillet surface by following formula:, so α angles It is set as, 43 °≤α≤64.5 °.
Further, the thickness of the light guide plate determines with the derivation relation of angle according to following formula:
H=
Wherein, L is the width of lower fillet surface incident light source plane of light incidence, and H is the thickness of light guide plate, is adjusted according to the formula All angles reduce the thickness of light guide plate, and improve utilization rate of the light in the middle of light guide plate.
Compared with prior art, the invention has the advantages that:This structure is changed from LED incident side structures, In order to not reduce the dimensional thickness of LED, the LED of original vertical type is reclined and is had a certain degree with light guide plate bottom surface.Utilize Geometric algorithm and optical principle are designed to the module, incident side light guide plate is formed specific geometry and enter by light Major part can be totally reflected in the middle of light guide plate.The light energy utilization ratio of light guide plate of the structure is obtained relative to the light guide plate of traditional structure To obvious raising, while also achieving the purpose of light guide plate slimming.
The present invention will be further described in detail with reference to the accompanying drawings and detailed description.
Brief description of the drawings
Fig. 1 is light guide structure main body, optical coupling structure locus schematic diagram and light in the first initial configuration of the invention The schematic diagram that coupled structure angle calculation schematic diagram and light are totally reflected in guide-lighting main body.
Fig. 2 is optical coupling structure angle calculation schematic diagram in the first initial configuration of the invention.
Fig. 3 is, in the second initial configuration optical coupling structure locus of the invention schematic diagram, lower fillet surface to be designed as convex Lens Design figure.
Fig. 4 is, in the 3rd initial configuration optical coupling structure locus schematic diagram of the invention, lower fillet surface to be designed as recessed Lens Design figure.
Fig. 5 is, in the 4th initial configuration optical coupling structure locus schematic diagram of the invention, upper fillet surface to be designed as recessed Lens Design figure.
Fig. 6 is, in the 5th initial configuration optical coupling structure locus schematic diagram of the invention, upper fillet surface to be designed as certainly By curved surface.
Fig. 7 is the first initial configuration left view of the invention.
Fig. 8 is the 5th initial configuration left view of the invention.
Fig. 9 is the three-dimensional modeling figure of the overall light guide structure of the first initial configuration of the invention.
In figure:Fillet surface under 1-, the upper fillet surfaces of 2-, 3- light guide plates upper surface, 4- light guide plate lower surfaces, 5- incident light sources (LED chip), 6,7- reflector plates, 8- reflector layers, the upper fillet surface of 9- free form surface shapes, the reflector layer of 10- free form surface shapes, 11- light guide plate rear end faces, 12- light guide plate left surfaces, 13- light guide plate right flanks, the upper fillet surface of 14- concavees lens shapes, 15- convex lens Specular lower fillet surface, the lower fillet surface of 16- concavees lens shapes.
Specific embodiment
Embodiment one:As shown in Fig. 1 ~ 9, a kind of thin type light guide structure, including incident light source(LED chip)5th, incident side Optical coupling structure and light guide structure main body, the light guide structure main body include light guide plate, and the incident side optical coupling structure includes Be arranged on the upper fillet surface 2 and lower fillet surface 1 of light guide plate leading section, the angle of the upper fillet surface and lower fillet surface is α, it is lower fall The angle of edged surface and light guide plate lower surface extended line is β, the line of lower fillet surface lower extreme point and upper fillet surface upper extreme point, the line It is θ 3 with the angle of light guide plate surface normal, the light guide plate leading section is light guide plate short side place, the incident light source is oblique The underface of the fillet surface under light guide plate is put, the gap side between incident light source and lower fillet surface is posted and reduces what light spilt Reflector plate 6 and 7.
On the basis of LED light Source size is not reduced, LED light source is carried out into placement of reclining, and design matched Optical coupling structure light guide plate, it is ensured that arrival light guide plate incident side that light is more concentrated simultaneously is totally reflected, so as to effectively reduce lead The thickness of tabula rasa realizes the thin type of whole backing structure.Under reclining type LED light coupled structure as shown in figure 1, include wherein Fillet surface 1, upper fillet surface 2, reflector plate 6 and 7, light guide plate upper surface 3 and light guide plate lower surface 4.As shown in figure 9, wrapping wherein Include light guide plate left surface 12, light guide plate right flank 13 and light guide plate rear end face 11.It is subject in the setting of structure interior surface certain Setting, it is light full impregnated mistake to set lower fillet surface 1, light guide plate upper surface 3 and light guide plate lower surface 4, light guide plate left surface 12, is led Tabula rasa right flank 13 and light guide plate rear end face 11 are hypersorption.Light enter light guide plate in the middle of, wherein with light guide plate in Surface normal is angled ceaselessly to there is full transmitting, the full transmitting of light before light guide plate lower surface 4 does not add dot matrix Never it is destroyed until being absorbed by guide-lighting tabula rasa left surface 12, light guide plate right flank 13 and light guide plate rear end face 11.
In order to realize the light-out effect highest of light guide plate, when must as far as possible meet all of light into light guide plate during design All be totally reflected, now can with the light for utilizing it is necessarily most, light efficiency is also highest.Therefore, it is necessary to study, such as What by adjusting the key parameter of thin type light guide plate optical coupling structure, including:The morphological structure of optical coupling structure, and Surface treatment of structure etc. so that the thickness of light guide plate can either be effectively reduced, while ensure that its light extraction light higher again Effect.
In view of light from lower fillet surface into light guide plate and making light be totally reflected wherein, light is complete in such as Fig. 1 The situation of reflection, sets the design of the angle between each interface.Divide three kinds of situation explanations:The first situation reaches upper chamfering Face 2, and reflex to the light of lower fillet surface 2.Second situation directly reaches the light of light guide plate upper surface 3.The third situation Fillet surface 2 in arrival, and reflex to the light of light guide plate lower surface 4.
As shown in figure 1, according to light path principle, θ 1 is the angle of total reflection, the i.e. light by air incidence light guide plate and lead The normal angle of fillet surface 1 is 90 ° under tabula rasa, so θ 1 is to incide the maximum angle inside light guide plate, i.e., light guide plate is complete Angle of reflection.If normal of this light just with fillet surface on light guide plate 2 is vertical, upper fillet surface 2 has sticked reflector layer 8, light warp After the reflection of the face of upper chamfering 2, light reaches lower fillet surface 1 and the critical angle that the angle of the normal of lower fillet surface 1 is light guide plate, if will α angles reduce, and light becomes by after the reflection of upper fillet surface 2, reaching the light of lower fillet surface 1 with the angle of the normal of lower fillet surface 1 It is small(Less than angle of total reflection θEntirely), then light can be from the outgoing of lower fillet surface 1.If the increase of α angles, light are modulated through upper fillet surface 2 Afterwards, reaching lower fillet surface 1 will become big with the normal angle of lower fillet surface 1(More than angle of total reflection θEntirely), then total reflection can be met fixed Rule.Condition:
As shown in Fig. 2 θ 3 is the light that the light source on lower fillet surface 2 sends, light guide plate exiting surface and light guide plate upper surface are reached Normal angled minimum light, if θ 3 can be more than the critical angle of light guide plate, sent by light source, reach light guide plate light extraction All light in face can be totally reflected in light guide plate upper surface.Then:
As shown in Figure 2, it is considered to the incident upper fillet surface 2 of light, the situation of light guide plate lower surface 4 is reflexed to.Upper fillet surface 2 in figure, Dotted line at lower fillet surface 1 and light guide plate lower surface 4 is respectively three normals of plane, then go up the normal of fillet surface 2 with it is lower fall It is 180- α that the normal of edged surface 1 intersects.If θ 5 reduces 1 °, α angles, β angles are constant, then 6 jiaos of θ reduces 1 °, and 2 times of 6 jiaos of θ reduce 2 °, then 90- θ 7 reduce 1 °, and θ 7 increases 1 °.So working as θ 5=θEntirelyWhen, θ 7 reaches minimum value, if the minimum value of θ 7 can meet total reflection bar Part, then light is incident goes up fillet surface 2, and the situation for reflexing to light guide plate lower surface 1 can meet total reflection law.Such as Tu Ke get Formula:
To meet total reflection theorem, then θ 3 is greater than 90 °, arranges:
As shown in figure 1, LED chip 5 is located at immediately below lower fillet surface 2, both are very near apart from h1, and h1 is 0.1mm.By optics The method of emulation, LED chip 5 is relatively serious with guide-lighting sheet separation light leak, and accounting in total light leak rate has very big proportion.Such as Shown in Fig. 1, utilized to improve light, two panels frequency modulated light piece 6,7 is sticked in gap both sides, made from light is missed light utilize Come.
Embodiment two:Do thin due to the thickness of light guide plate being tried one's best, even less than the local width of LED chip, while It is required that improving light efficiency.Thickness and the light efficiency profit of preferable light guide plate are unable to reach in the case of in meeting based on invention example one With rate.From actual light leak situation, close to about 1/3 section very small to the contribution of bottom surface light leak of ramp top.Case-based Reasoning One condition and principle, adjusts optical coupling structure to reduce the light leak rate of light guide plate by example 2345.Such as Fig. 6, by light Coupled structure is designed to free form surface 9, and last layer reflector layer 10 is simultaneously pasted on free form surface, makes to be projected from LED chip 5 Light, the light of upper fillet surface 2 is reached into light guide plate, and the upper position different designs of fillet surface position is reached according to light Radian make to reflect light inside light guide plate full transmitting wherein.To make, optical coupling structure is convenient to be processed, and is directly set Photometric coupled structure is circular arc type, set down the summit of fillet surface and the summit of light guide plate upper surface as optical coupling structure is initial and End point, makes optical coupling structure starting point be set with certain tangential angle according to above-mentioned formula.It is thick 1.3mm to be reached in light guide plate When spending, the utilization rate of light can reach 95%.The purpose of slimming is being realized, light can be also being reached and efficiently be utilized.
The foregoing is only presently preferred embodiments of the present invention, all impartial changes done according to scope of the present invention patent with Modification, should all belong to covering scope of the invention.

Claims (9)

1. a kind of thin type light guide structure, it is characterised in that:Including incident light source, incident side optical coupling structure and light guide structure master Body, the light guide structure main body includes light guide plate, and the incident side optical coupling structure includes being arranged on the upper of light guide plate leading section The angle of fillet surface and lower fillet surface, the upper fillet surface and lower fillet surface is α, lower fillet surface and light guide plate lower surface extended line Angle be β, the line of lower fillet surface lower extreme point and upper fillet surface upper extreme point, the angle of the line and light guide plate surface normal Be θ 3, the light guide plate leading section be light guide plate short side where, the tilting fillet surface under light guide plate of the incident light source just under Side, the gap side between incident light source and lower fillet surface is posted and reduces the reflector plate that light spills.
2. thin type light guide structure according to claim 1, it is characterised in that:Between the incident light source and lower fillet surface Away from being 0.1mm, the width of the width more than or equal to incident light source of lower fillet surface, the linear type of incident light source is uniformly arranged In the underface of lower fillet surface.
3. thin type light guide structure according to claim 1, it is characterised in that:The lower fillet surface for make light reflect into Enter the beveling plane of light guide plate or to make the convex lens of light-ray condensing or to make the concavees lens of divergence of beam or to make light exist The free form surface being totally reflected in light guide plate.
4. thin type light guide structure according to claim 1, it is characterised in that:To make to reflex to lower chamfering from upper fillet surface The light of face and light guide plate lower surface can occur full transmitting, and the upper fillet surface is beveling plane, convex lens, concavees lens or freedom Curved surface.
5. thin type light guide structure according to claim 1, it is characterised in that:It is configured with reflective on the upper fillet surface Layer.
6. thin type light guide structure according to claim 1, it is characterised in that:Light is directly mapped to leaded light from lower fillet surface Plate upper surface, light need to be more than or equal to angle of total reflection θ with the normal angle of light guide plate upper surfaceEntirely, the angles of the θ 3 are by following formula It is determined that:θ3≥θEntirely=43°。
7. thin type light guide structure according to claim 6, it is characterised in that:The angle of the β is defined to 0 °≤β< 43°。
8. thin type light guide structure according to claim 7, it is characterised in that:The folder of the upper fillet surface and lower fillet surface Angle α is determined by following formula:, so α angle initializations are, 43 °≤α≤64.5 °.
9. thin type light guide structure according to claim 1, it is characterised in that:The thickness of the light guide plate is pushed away with angle Relation is led according to following formula to determine:
H=
Wherein, L is the width of lower fillet surface incident light source plane of light incidence, and H is the thickness of light guide plate, is adjusted according to the formula All angles reduce the thickness of light guide plate, and improve utilization rate of the light in the middle of light guide plate.
CN201710248221.4A 2017-04-17 2017-04-17 A kind of thin type light guide structure Active CN106842411B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020221641A1 (en) * 2019-04-29 2020-11-05 Signify Holding B.V. A light emitting device

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Publication number Priority date Publication date Assignee Title
JP2004342545A (en) * 2003-05-19 2004-12-02 Matsushita Electric Ind Co Ltd Lcd backlight unit
CN102269839A (en) * 2011-06-14 2011-12-07 友达光电股份有限公司 Light guide plate and backlight module group
CN203324500U (en) * 2013-05-16 2013-12-04 富昱科技开发股份有限公司 Light guiding board with wedge-shaped light incidence structure
CN104359051A (en) * 2014-11-10 2015-02-18 京东方科技集团股份有限公司 Backlight module and display device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004342545A (en) * 2003-05-19 2004-12-02 Matsushita Electric Ind Co Ltd Lcd backlight unit
CN102269839A (en) * 2011-06-14 2011-12-07 友达光电股份有限公司 Light guide plate and backlight module group
CN203324500U (en) * 2013-05-16 2013-12-04 富昱科技开发股份有限公司 Light guiding board with wedge-shaped light incidence structure
CN104359051A (en) * 2014-11-10 2015-02-18 京东方科技集团股份有限公司 Backlight module and display device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020221641A1 (en) * 2019-04-29 2020-11-05 Signify Holding B.V. A light emitting device

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