CN1698001A - Back light for display device - Google Patents

Back light for display device Download PDF

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Publication number
CN1698001A
CN1698001A CNA2004800004651A CN200480000465A CN1698001A CN 1698001 A CN1698001 A CN 1698001A CN A2004800004651 A CNA2004800004651 A CN A2004800004651A CN 200480000465 A CN200480000465 A CN 200480000465A CN 1698001 A CN1698001 A CN 1698001A
Authority
CN
China
Prior art keywords
light
light source
unit
guiding panel
prism pattern
Prior art date
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
CNA2004800004651A
Other languages
Chinese (zh)
Inventor
朴基渐
金大岘
孔成铉
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.)
Wooyoung Co Ltd
Original Assignee
Wooyoung Co Ltd
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 Wooyoung Co Ltd filed Critical Wooyoung Co Ltd
Publication of CN1698001A publication Critical patent/CN1698001A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/42—Auxiliary equipment or operation thereof
    • B01D46/48—Removing dust other than cleaning filters, e.g. by using collecting trays
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0039—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with flow guiding by feed or discharge devices
    • B01D46/0041—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with flow guiding by feed or discharge devices for feeding
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
    • G02B6/0061—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to provide homogeneous light output intensity

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Planar Illumination Modules (AREA)
  • Light Guides In General And Applications Therefor (AREA)

Abstract

Provided is a backlight unit for a display device. The backlight unit includes a transparent light guide panel having a lower surface with a pattern forming unit in which a prism pattern is formed as grooves, a light source disposed on a side of the light guide panel, a reflection plate disposed under the light guide panel, wherein depths and/or a density of the grooves in the prism pattern consecutively increase close to electrodes of the light source in a length direction of the light source.

Description

Back light for display device
Technical field
The present invention relates to a kind of back light for display device, relate in particular to a kind of back light for display device of prism pattern of the non-uniformity improvement light guiding panel by eliminating display brightness.
Background technology
Usually, panel display board can be divided into: the light emission type, and as cathode ray tube (CRT), electroluminescent cell, and plasma display; And the light-receiving type, as LCD (LCD).
LCD comes display image by oneself producing light, but comes display image by receive light from the external world.Therefore, in order to make the display operate as normal, LCD must have an extra light source, as back light unit.
The back light unit of LCD can be divided into direct reflection-type and peripheral type according to the position of light source.Described peripheral type needing to be suitable for small and light display.Yet, in the peripheral type back light unit,, therefore, need a light guiding panel because light source is positioned at a side of back light unit, this light guiding panel equably direct light from light source to the LCD unit.
In peripheral type because total reflection effect, a part of light that sends by the light source that is positioned at back light unit one side, with than the lower angle of predetermined angular to the surface that is internally reflected to light guiding panel.Therefore, this part light is guided along light guiding panel.On the other hand, when prism pattern was formed at the lower surface of light guiding panel, the light that is sent by light source arrived described prism pattern, and light outwards reflects from light guiding panel with predetermined angle then.Therefore, when prism pattern distributed with suitable manner, a part of light arrived the end of light guiding panel, and a part can be left light guiding panel in prism pattern by the refraction of prism pattern unit with the light that the angle bigger than the angle of total reflection reflects.
Yet as mentioned above, the common back light unit that is formed with the prism pattern light guiding panel has following problem.
The first, electrode is positioned at the light source end portion, and electrode is not luminous, and is therefore less with respect to other zone near the luminance brightness in the zone of electrode, thereby the length direction Luminance Distribution that causes light source is inhomogeneous.
The second, when light source was near, brightness increased, and when light source was far away, brightness reduced, and therefore, the light channeling direction can produce uneven brightness, as bright line.
Summary of the invention
The object of the invention
The invention provides a kind of back light unit of display, in this unit, be formed at the prism pattern of light guiding panel lower surface, improve the non-uniform Distribution of display brightness by correction.
The present invention program
According to an aspect of the present invention, provide a kind of back light unit of display, comprising: transparent light guide panel, this light guiding panel have one to have the lower surface that pattern forms the unit, and this pattern forms a prism pattern that is formed by groove in unit; Place the light source of at least one side of light guiding panel; Place the reflecting plate below the light guiding panel, wherein in the light source length direction, along the direction near the electrode of light source, the density of the groove in the prism pattern constantly increases.
According to an aspect of the present invention, provide the back light unit of another kind of display, having comprised: transparent light guide panel, this light guiding panel have one to have the lower surface that pattern forms the unit, and this pattern forms a prism pattern that is formed by groove in unit; Place the light source of light guiding panel one side; Place the reflecting plate below the light guiding panel, wherein, in the light source length direction, along the direction near the electrode of light source, the density of the groove in the prism pattern constantly increases.
According to an aspect of the present invention, provide the back light unit of another kind of display, having comprised: transparent light guide panel, this light guiding panel have a pattern to form the unit, and this pattern forms a prism pattern that is formed by groove in unit; Place the light source of light guiding panel one side; Place the reflecting plate below the light guiding panel, wherein, in the light source length direction, along the direction near the electrode of light source, the degree of depth and the density of the groove in the prism pattern constantly increase.
The degree of depth of prism pattern further groove and/or density constantly increase along the direction away from light source.
Effect of the present invention
The back light unit of display of the present invention has the following advantages:
The first, the degree of depth and/or the density of the prism pattern further groove by improving the light source length direction have solved the problem of light source length direction brightness irregularities.
The second, by increasing the degree of depth and/or density, solved the problem of light channeling direction brightness irregularities away from the groove of light source.
Description of drawings
Fig. 1 is the separate perspective view of back light unit of the present invention.
Fig. 2 is the viewgraph of cross-section of I-I ' direction along the line among Fig. 1.
Fig. 3 A is the light characteristic figure of conventional backlight unit along the light source length direction.
Fig. 3 B is conventional backlight unit light characteristic figure along the light channeling direction in light guiding panel.
Embodiment
In conjunction with the accompanying drawings the preferred embodiments of the present invention are described, it is more abundant that the present invention will be described.
Fig. 1 is that back light unit separate perspective view and Fig. 2 that the present invention describes is the viewgraph of cross-section of I-I ' direction along the line among Fig. 1.
With reference to figure 1 and Fig. 2, according to a preferred embodiment of the invention, back light unit comprises transparent light guide panel 100, the lower surface of this light guiding panel 100 has a pattern to form the unit, this pattern forms fluted 111 prism pattern that constitute in the unit 110, place the light source 200 of light guiding panel 100 at least one sides and place reflecting plate 300 below the light guiding panel 100.In Fig. 1, all there is light source 200 both sides of light guiding panel 100, the side but light source 200 can only be placed in one.Lamp bracket 220 is round light source 200.
Fig. 3 A describes the light characteristic of conventional backlight unit along the light source length direction.Traditional back light unit has a prism pattern that is formed by the groove of the even degree of depth and density below light guiding panel 100.
With reference to figure 1,2 and 3A, because the electrode 211 and the electrode 212 of light source 200 is not luminous, other zone of brightness ratio of closing on the region S 1 of electrode 211 and 212 and S2 is low.That is to say that the closer to the electrode 211 and 212 of light source 200, luminance brightness is low more.Therefore, brightness irregularities along its length, for example, the Y direction of light source 200.
In order to solve the uneven problem of length direction luminance brightness of light source 200, constantly increase at the degree of depth of prism pattern further groove 111 length direction along light source 200.That is to say that more near electrode 211 and 212, the degree of depth of groove 111 is dark more.
Therefore, near the electrode 211 of light source 200 and 212 neighbour region S 1 and S2, bigger relatively than other zone by the amount of the light of pattern formation unit 110 refractions.Therefore, increase with the light that outside light guiding panel 100, reflects greater than the angle of total reflection.That is to say, solved along the problem of light source 200 length direction brightness irregularities.
Fig. 3 B explanation conventional backlight unit is in the light characteristic of light guiding panel along the light channeling direction.That is to say the prism pattern that traditional back light unit has the groove of the even degree of depth and density to form below light guiding panel 100.
With reference to figure 1,2, with 3B, when groove 111 away from light source 200, brightness backlight reduces.
In order to solve the problem of light channeling direction brightness irregularities, for example, the directions X of light, the degree of depth of the groove 111 in the prism pattern is along with increasing away from light source 200.Therefore, the brightness irregularities problem at the light channeling direction is solved.
Embodiment
Embodiments of the invention are described now.The similar part of describing in the above-described embodiments no longer repeats.
According to this embodiment, the density of the groove 111 in the prism pattern at the length direction of light source 200, constantly increases along electrode 211 and 212 directions near light source 200.
This situation, because the spacing of groove 111 reduces, at neighbour region S 1 and the S2 to electrode 211 and 121, other zone of light ratio that is formed unit 110 refractions by pattern is some more relatively.Therefore, the amount with the light that reflects outside light guiding panel 100 greater than the angle of total reflection increases.That is to say, solved the problem of the brightness irregularities of light source 200 length directions.
Also have,, solved the uneven problem of light channeling direction luminance brightness by the density of continuous increase away from the groove 111 in the prism pattern in the patterns formation unit 110, light source 200 place.
Another embodiment of the present invention, in the length direction of light source 200, the edge is near the electrode 211 of light source 200 and 212 direction, and the degree of depth and the density of prism pattern further groove 111 constantly increase.
This situation, near the electrode 211 of light source 200 and 212 neighbour region S 1 and S2, some more relatively by other zone of light ratio of pattern formation unit 110 refractions.Therefore, the amount with the light that reflects outside light guiding panel 100 greater than the angle of total reflection increases.That is to say, solved light source 200 length directions, the Y direction of light for example, the problem of brightness irregularities.
Also have,, solved the problem of light channeling direction brightness irregularities by increasing the degree of depth and the density that forms the groove 11 in the prism pattern in the unit 110 away from light source 200 place's patterns.

Claims (6)

1, a kind of back light for display device comprises:
Transparent light guide panel, this light guiding panel have one to have the lower surface that pattern forms the unit, and this pattern forms a prism pattern that is formed by groove in unit;
Place the light source of at least one side of light guiding panel;
Place the reflecting plate below the light guiding panel,
It is characterized in that in the light source length direction, the edge is near the direction of the electrode of light source, the degree of depth of the groove in the prism pattern constantly increases.
2, back light for display device as claimed in claim 1 is characterized in that: the degree of depth of prism pattern further groove constantly increases along the direction away from light source.
3, a kind of back light for display device comprises:
Transparent light guide panel, this light guiding panel have one to have the lower surface that pattern forms the unit, and this pattern forms a prism pattern that is formed by groove in unit;
Place the light source of light guiding panel one side;
Place the reflecting plate below the light guiding panel,
It is characterized in that in the light source length direction, the edge is near the direction of the electrode of light source, the density of the groove in the prism pattern constantly increases.
4, back light for display device as claimed in claim 3 is characterized in that: the density of prism pattern further groove constantly increases along the direction away from light source.
5, a kind of back light for display device comprises:
Transparent light guide panel, this light guiding panel have a pattern to form the unit, and this pattern forms a prism pattern that is formed by groove in unit;
Place the light source of light guiding panel one side;
Place the reflecting plate below the light guiding panel,
It is characterized in that in the light source length direction, the edge is near the direction of the electrode of light source, the degree of depth and the density of the groove in the prism pattern constantly increase.
6, back light for display device as claimed in claim 5 is characterized in that: the degree of depth of prism pattern further groove and density constantly increase along the direction away from light source.
CNA2004800004651A 2003-05-01 2004-04-30 Back light for display device Pending CN1698001A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020030027987 2003-05-01
KR1020030027987A KR20040094053A (en) 2003-05-01 2003-05-01 Back light for display device

Publications (1)

Publication Number Publication Date
CN1698001A true CN1698001A (en) 2005-11-16

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CNA2004800004651A Pending CN1698001A (en) 2003-05-01 2004-04-30 Back light for display device

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JP (1) JP2006515434A (en)
KR (1) KR20040094053A (en)
CN (1) CN1698001A (en)
WO (1) WO2004097513A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102003641A (en) * 2009-08-26 2011-04-06 Lg伊诺特有限公司 Backlight unit and display apparatus using thereof
CN101275721B (en) * 2007-03-28 2012-10-10 日亚化学工业株式会社 Backlight unit
CN101657745B (en) * 2007-04-12 2013-02-06 皇家飞利浦电子股份有限公司 Improved light guide and light-output device
CN104132284A (en) * 2014-08-08 2014-11-05 深圳市国显科技股份有限公司 LCD backlight display effect optimized structure

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100462802C (en) * 2005-10-14 2009-02-18 鸿富锦精密工业（深圳）有限公司 Backlight module and light guiding plate thereof
KR102133420B1 (en) * 2014-08-28 2020-07-14 엘지디스플레이 주식회사 Curved liquid crystal display apparatus

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100500638B1 (en) * 1997-06-16 2005-10-12 삼성전자주식회사 Backlight device of LCD module
KR100271036B1 (en) * 1997-07-21 2000-11-01 구본준, 론 위라하디락사 Backlight device
JP3809328B2 (en) * 2000-07-28 2006-08-16 株式会社日立製作所 Liquid crystal display
KR20020083886A (en) * 2001-06-08 2002-11-04 화우테크놀러지 주식회사 Light guide panel of backlight unit
KR100505189B1 (en) * 2002-08-07 2005-08-08 주식회사 엘 앤 에프 Light guide plate for back light

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101275721B (en) * 2007-03-28 2012-10-10 日亚化学工业株式会社 Backlight unit
CN101657745B (en) * 2007-04-12 2013-02-06 皇家飞利浦电子股份有限公司 Improved light guide and light-output device
CN102003641A (en) * 2009-08-26 2011-04-06 Lg伊诺特有限公司 Backlight unit and display apparatus using thereof
CN104132284A (en) * 2014-08-08 2014-11-05 深圳市国显科技股份有限公司 LCD backlight display effect optimized structure

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Publication number Publication date
KR20040094053A (en) 2004-11-09
JP2006515434A (en) 2006-05-25
WO2004097513A1 (en) 2004-11-11

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