CN1912715A - Backlight device - Google Patents
Backlight device Download PDFInfo
- Publication number
- CN1912715A CN1912715A CN 200610111182 CN200610111182A CN1912715A CN 1912715 A CN1912715 A CN 1912715A CN 200610111182 CN200610111182 CN 200610111182 CN 200610111182 A CN200610111182 A CN 200610111182A CN 1912715 A CN1912715 A CN 1912715A
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- aforementioned
- light source
- lighting device
- barrier
- linear light
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Abstract
The object of the invention is to provide a backlight device with thin type, few cold cathode discharge tubes and enhanced display quality by constituting a back light (1) wherein a section (4) is formed by providing a barrier (3) between cold cathode discharge tubes (2) and light is supplied from an adjacent section into a part which becomes dark within the section (4) by using a light leakage means and a reflection means.
Description
Technical field
That the present invention relates to be used as relatively large backlight liquid crystal display devices such as LCD TV, as a plurality of cold-cathode discharges to be made the mode on the larnacilla shell of being configured in that the is arranged in parallel structure with light source backlight.
Background technology
Fig. 9 be represent the example of the structure of this kind back lighting device 90 (back light) in the past, for example by carry out white application etc. in the inboard, and the reflecting plate 91a that reflectivity is improved forms case shape portion 91, with certain interval a plurality of cold cathode discharge tubes 92 are installed to inside, and, this example raising middle flask shape portion 91 be and casing component 91b between have the dual structure in space, and the below that aforementioned cold cathode fulgurite 92 is installed is provided with slotted eye 91c.
And, diffuser plate 93 is installed on the peristome of the top of aforementioned case shape member 91, and then is placed on the LCD (not shown) of the top of this diffuser plate 93 with the transmitted light irradiation.In addition, installed in the slotted eye 91c of below of aforementioned cold cathode discharge tube 92 and be injected into the good copper silicon railway grease of thermal conductivity (シ リ コ Application グ リ ス) 94 etc., dispelled the heat by the casing component 91b of contact extraneous air.
[patent documentation 1] spy opens the 2002-196326 communique
Open invention
The problem that invention will solve
But, in the structure of aforesaid back lighting device in the past 90, for make display surface comprehensively, be diffuser plate 93 be uniform brightness comprehensively, so dwindle interval between the aforementioned cold cathode discharge tube 92, must make the place that does not produce obfuscation in the centre, if like this when the quantity that has increased cold cathode fulgurite 92, in any case then can not avoid the temperature of cold cathode discharge tube 92 to rise, and produce such as the low inferior problem of luminescence efficiency.
Therefore, make the degree of depth of deepening aforementioned case shape member 91 in the reality, suitably widen interval between the cold cathode discharge tube 92, and, even for the hot spot that so also generates, the positive upper part of the brighter relatively cold cathode discharge tube 92 at the back side of diffuser plate 93, the some overprint brush 95 that carries out opaque color such as black are adjusted the demonstration that transmissivity etc. obtains uniform luminance.But because the electric power that will control cost and consume, appearance strengthens the necessity at the interval between the linear light source, the method that needs to seek further to eliminate hot spot thus.
Therefore, in the existing back lighting device 90, make brightness show insufficient by the number that reduces cold cathode discharge tube 92 and display quality that produce is low, the maximization of back lighting device 90 integral body made by dark case shape member 91, the problems such as cost rising that caused by the increase of machining periods such as the injection of copper silicon railway grease 94, some overprint brush 95, these problems are resolved have just become current problem.
Summary of the invention
The present invention is as solving the concrete grammar that aforesaid problem is in the past used, a kind of back lighting device is provided, it is characterized in that: a plurality of linear light sources are set up in parallel, the diffuser plate that possesses diffused transmission light in the front face side of aforementioned linear light source, and the rear side at aforementioned linear light source possesses the reflecting plate that light is reflected to aforementioned diffuser plate direction, be provided with barrier between each aforementioned linear light source on the aforesaid reflecting plate, and form the interregional of each aforementioned linear light source, and by adjusting the height of aforementioned barrier, make direct light from the aforementioned linear light source of adjacency to adjacent areas incident, and will be from the part of the deficiency of the light that is set at the aforementioned linear light source in the aforementioned areas, use incident light to replenish from adjacent area, and make irradiation brightness homogenising from aforementioned diffuser plate, thus as realizing miniaturization, display quality improves, the device that the problem that reduces cost is solved.
According to the present invention, because the miniaturization more of LCD TV for example or graphoscope, display quality are improved, so practicality, function are improved together, and, make the advantage that commodity further improves and generation is universal easily by the cost reduction.That is, if the number of linear light source with in the past identical, then can make the thickness attenuation of back lighting device, on the contrary, if the thickness of back lighting device is identical, then with in the past the device that just can reach same function with the quantity of a small amount of linear light source of comparing backlight.
Description of drawings
Fig. 1 is the constructed profile that expression relates to the first light quantity uniforming device in the back lighting device of the present invention.
Fig. 2 is the curve map that expression makes the example of the light distribution characteristic when accommodating each cold cathode discharge tube regional independent.
Fig. 3 is illustrated between the summit in the next door between the zone and the diffuser plate gap is set, and will be from the intensity of the neighboring region light leak curve map of representing from the light leak in the zone that joins with the left side.
Fig. 4 is illustrated in the gap to be set between the summit in interregional next door and the diffuser plate and to use the curve map of representing in the light leak in the zone on right side from joining from the intensity of neighboring region light leak.
Fig. 5 is the curve map of the illumination light shape that obtained by the first light quantity uniforming device of expression.
Fig. 6 is the constructed profile that expression relates to the second light quantity uniforming device in the back lighting device of the present invention.
Fig. 7 is the curve map of expression by the example of the light distribution characteristic of the second light quantity uniforming device.
Fig. 8 is the curve map that expression light distribution characteristic in the back lighting device of the present invention is shown under the state that is illustrated in the first light quantity uniforming device and the second light quantity uniforming device addition.
Fig. 9 represents the sectional view of example in the past.
Preferred forms
The present invention is described in detail according to illustrated embodiment below.Relate to back lighting device of the present invention (below be referred to as back lighting device 1) with what symbol 1 was represented among Fig. 1, this back lighting device 1 is to make the housing shape reflecting plate 1 a formation that the polycarbonate (Port リ カ one ボ ネ イ ト) of white, PET, ABS, cyclic olefin polymer (the シ Network ロ オ レ Off イ Application Port リ マ one) resin material of etc.ing form by containing titanium dioxide etc. basically, and a plurality of cold cathode discharge tubes 2 are mounted with certain interval, certain number in inside.
And,, also can be hardware, the resin component element of inner face having been coated white colour though this reflecting plate 1a describes with the example that is formed by white resin material in the present embodiment.In addition, as the example of linear light sorurce,, also can utilize so-called fluorescent lights such as hot-cathode discharge tube though describe with the example of cold cathode discharge tube.
And, middle at each cold cathode discharge tube 2 that aforementioned back lighting device 1 has been installed, be provided with the barrier 3 that protrudes in cold cathode discharge tube 2 sides, form zone 4 thus.In addition, also be a cold cathode discharge tube 2 to be installed obviously among Fig. 1 in a zone.In addition, the upper surface of aforementioned back lighting device 1 is provided with diffuser plate 5, is identical and be provided with these points of LCD (not shown) up with existing example.
Now, here Fig. 2 is the example of luminous intensity distribution A1 of cold cathode discharge tube 2 monomers in the zone 4 of the aforementioned barrier of expression 3 when arriving diffuser plates 5, and the brightest directly over certain aforementioned cold cathode discharge tube 2, past more regional 4 end is dark more.And this light and shade ratio is about 2.5 times, is not can reach to appreciate for example value of television image etc.
The present invention as first device of realizing that the light and shade homogenising is used, adjusts the height of aforementioned barrier 3, and the light of cold cathode discharge tube 2 also is distributed in adjacent areas 4.If describe with Fig. 1, owing to shown 3 cold cathode discharge tubes 2 in this Fig. 1, before this towards this figure, the cold cathode discharge tube that the cold cathode discharge tube that the cold cathode discharge tube on the left side is made as 2L, the right is made as 2R, central authorities is made as 2C and describes.
At this, the height of the aforementioned barrier 3 of supposition has reached diffuser plate 5 earlier, then form each zone 4 by the close-connected optical independent structures in four limits, do not incide the zone of central authorities from the light of cold cathode discharge tube 2L, 2R, promptly be provided with the zone 4 of cold cathode discharge tube 2C, and each is not brought influence.Fig. 2 is the state of luminous intensity distribution (luminous intensity distribution) H1 that is illustrated in each zone 4 of this state.
Also be clearly in Fig. 2, the brightest as part directly over the cold cathode discharge tube 2 among the luminous intensity distribution H1 of the state in above-mentioned independently each zone 4, and past more regional 4 two ends go brightness dark more, and the light and shade difference of this moment reaches about 2.5 times.And in this embodiment, the distance between each cold cathode discharge tube 2 is set to 40mm.And the distance of the minimum point of the reflecting surface side of expelling plate 1a and the Line of light source of diffuser plate 5 is set to about 18mm, compares at interval with this, and it is wide that the interval of linear light source is set.
The present invention, before this as first device, by adjusting the height of aforementioned barrier 3, the clearance D (with reference to figure 1) that between barrier 3 and diffuser plate 5, is provided with, by adjusting the amount of this clearance D, will be directed into from the light of the cold cathode discharge tube 2 of adjacent position deficiency in light quantity part, make the devices of realizing uniform luminances in the zone 4.
At this, if study Fig. 2 once more, as described above, in a zone 4, luminous intensity distribution H1 represent cold cathode discharge tube 2 directly over the maximum amount value, it is low more that past more left and right directions moves light quantity, form so-called in high shape.Therefore, there is no need directly over aforementioned cold cathode discharge tube 2 part in the reality and scatter from the light that is adjacent to zone 4, if to about the low part of light quantity of end strengthen just passable as emphasis.
Therefore, in principle among the present invention for some regional 4, supply with a large amount of light the closer to a left side more, supply with a large amount of light more the closer to the right side if can make from the zone 4 that is connected in the right side from half one of zone 4 that is connected in the left side in the left side, the light quantity compensation chevron shown in Figure 2 in the zone of accept supplying with so 4, and form and tend to the homogenising direction.
Aforesaid in order to receive the light of supplying with from neighboring region, for example, the width and the position of the interval D that is provided with on the boundary in the zone 4 on the left of adjusting and being connected in, and the center than the zone 4 of the supply side that receives light is just passable as long as light does not arrive half part of right side, be arranged on the interval D that is provided with on the boundary in the zone 4 that is adjacent to the right side equally so long as light do not arrive on the left of half part just passable.
At this moment, near the center of the supply side that receives light, aforementioned cold cathode discharge tube 2 is owing to be to have a predetermined caliber, so the scope that is covered by the tip of aforementioned barrier 3 produces different penumbra portions than being lacked by the light quantity that full caliber shone of aforementioned cold cathode discharge tube 2.The S of this penumbra portion is, along with from aforementioned cold cathode discharge tube 2 away from, block the expanded range of aforementioned cold-cathode tube, the shadow part that light quantity reduces gradually by aforementioned barrier 3.
As described above, because the core in zone 4 is parts of scattering abundant light quantity, for example, even this S of penumbra portion and core overlaid, though the influence as producing obstacle does not take place in practical application, wish that the part beyond the above-mentioned penumbra S of portion does not repeat with the central part phase-splitting.
Fig. 3 represents an as above illustrated example from the shape of the luminous intensity distribution HL of zone 4 incidents in left side when forming clearance D, and Fig. 4 is the example of the luminous intensity distribution HR of same established zone 4 incidents from the right side of expression.And Fig. 5 represents aforementioned luminous intensity distribution HL and luminous intensity distribution HR are added in the curve map of the luminous intensity distribution H2 behind the luminous intensity distribution H1 of Fig. 2.
At this, luminous intensity distribution H1 and luminous intensity distribution H2 are compared, think that both sides are that the light quantity at center is many, in being roughly high shape these all do not have what variation, but do thinner inspection, then find difference with respect to the maximal value of its light quantity of luminous intensity distribution H1 and minimum value the chances are 2.5 times, luminous intensity distribution H2 probably is 1.5 times, and is presenting corresponding effects aspect the homogenising of brightness.
The present invention comprises first uniforming device of above-mentioned explanation and makes up second uniforming device that this second uniforming device also utilizes above-mentioned barrier 3.That is, first uniforming device is will establish the device that zone 4 light is strengthened to insufficient section from the neighbour according to the interval D between barrier 3 and the diffuser plate 5.
At this, inquire into the effect of barrier 3 according to Fig. 1, then this barrier 3 is needed as and guarantees to the interval D 3 of neighboring region supply light quantity, promptly, only require the location of summit 3a, be used for aforementioned summit 3a is connected the side 3c that keeps with bottom surface 3b, when using the reflecting plate of white resin, in fact do not expect its effect especially.
The present invention is conceived to this problem, want to utilize aforementioned 3c with further realization homogenising, at this, for enforcement shown in Figure 1 the luminous intensity distribution H2 of first uniforming device, also remaining regional 4 the bright trend of central portion, the sufficient performance that can not say so and have as perfect back lighting device 1.
At this, the present invention as shown in Figure 6, to the side 3c of aforementioned barrier 3, form aforementioned cold cathode discharge tube 2 or its nearby as first focus, with directly over the summit of aforementioned barrier 3 to diffuser plate 5 nearby as the shape of the elliptoid part of second focus, be that elliptical area is, forms necessary part as a parallel mobile state that makes its major axis Z and aforementioned cold cathode discharge tube 2, promptly the bottom surface 3b from the summit 3a of barrier 3 to tabular surface forms band shape.
And, the position of second focus of aforementioned elliptical area is in aforementioned barrier 3 summit 3a directly over to diffuser plate 5 near, also comprise these by illumination characteristic and the scope the present invention who makes this position move, can adjust light up and down on a small quantity.
And because barrier 3 is present in the both sides of cold cathode discharge tube 2, these both sides are formed together, and aforementioned areas 4 is adjacency under close-connected state, so the aforementioned barrier 3 positive back sides (inside and outside) are formed ellipticity.In the present embodiment, reflecting plate 1a forms by white resin, more comprise the effect that makes its diffusion for light from linear light source, then the light of concentrating to focus seldom, for example with the mould grinding that forms etc., if the normal reflection composition of reflecting surface 1a is made high material, the light to focus is increased.And inner faces such as reflecting plate for example, can be with the very thin applications such as whitewash of particle when utilizing painted hardware, resin component element.
Fig. 7 is the state of luminous intensity distribution HO that expression possesses a zone 4 of barrier 3, and this barrier 3 is to have an oval planar side 3c that is formed as mentioned above, as can obtain the light quantity of maximum being scheduled in the position of two ends barrier 3.And, shown in Figure 8 be with enforcement shown in Figure 5 final luminous intensity distribution H3 after zone 4 combination of first uniforming device.
At this moment, summit 3a can adjust height and position by the inclination of aforementioned elliptical-type shape (focal length) and major axis Z, according to adjust this highly make the position of the S of penumbra portion be positioned at adjacent light source directly over.In addition, be similar to the side 3c of elliptical-type shape and the bottom surface 3b of tabular surface and be connected, do not get final product if do not produce the brightness spot that forms by this boundary with suitable curve.
Like this because 2 kinds of uniforming devices that made up, the light quantity difference also as shown, the central portion in zone 4 is about 11, be about 10 in the end in zone, can be described as in fact and be stabilized in the uniform scope, can become quite durable device in actual applications.In addition, for example cross when first-class by the effect of elliptical area revisal, freely with the part of the side 3c of barrier 3 by elliptical area form, other part is formed by straight lines etc.
As mentioned above, to spread to first method of insufficient section from light according to the present invention in abutting connection with zone, ground 4, with with the side 3c of the side 3 of barrier for forming with elliptical area and to set second method that second focus concentrates light to scatter in the part of necessity combined, by the back lighting device 1 that forms, the firstth, as accessing comprehensively the device of light quantity uniformly, can improve the performance of back lighting device 1.
In addition, in second, owing to made said structure, even the distance between the cold cathode discharge tube 2 is left to such an extent that surpassed in the past, also can form the inhomogeneity back lighting device 1 that keeps brightness, and carry out in the homogenising, the thickness of back lighting device 1 can be implemented at thin state, the integral body of LCD also can realize miniaturization, also can reduce cost thus.
Symbol description
1... back lighting device
1a... reflecting plate
2,2C, 2L, 2R... cold cathode discharge tube
3... barrier
3a... summit
3b... bottom surface
3c... side
4... zone
5... diffuser plate
D... the distance between barrier and the diffuser plate
Claims (5)
1, a kind of back lighting device, it is characterized in that: a plurality of linear light sources are set up in parallel, the diffuser plate that possesses diffused transmission light in the front face side of aforementioned linear light source, and the rear side at aforementioned linear light source possesses the reflecting plate that light is reflected to aforementioned diffuser plate direction, be provided with barrier between each aforementioned linear light source on the aforesaid reflecting plate, and form the zone of each aforementioned linear light source, and by adjusting the height of aforementioned barrier, make direct light from the aforementioned linear light source of adjacency to adjacent areas incident, and will be from the part of the light deficiency that is set at the aforementioned linear light source in the aforementioned areas, use incident light to replenish, make irradiation brightness homogenising from aforementioned diffuser plate from adjacent areas.
2, back lighting device as claimed in claim 1, it is characterized in that: to the scope of the direct light of aforementioned neighboring region incident, be to comprise the penumbra portion that the part of the caliber of aforementioned linear light source is blocked by aforementioned barrier, and should the zone connect the roughly part of half of side.
3, back lighting device as claimed in claim 1 or 2, it is characterized in that: on the aforementioned barrier, made up at aforementioned linear light source or its and nearby had first focus, and the elliptical area that nearby has second focus of the aforementioned diffuser plate directly over the summit of aforementioned barrier, be used to adjust light quantity distribution.
4, as the described back lighting device of claim 1～3, it is characterized in that: the aforementioned reflecting plate of aforementioned back lighting device is by having suitable diffusivity and suitable reflexive member forms.
5, back lighting device as claimed in claim 4 is characterized in that: aforementioned reflecting plate is that the resin material by white forms.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP232260/2005 | 2005-08-10 | ||
| JP2005232260A JP4548839B2 (en) | 2005-08-10 | 2005-08-10 | Backlight device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1912715A true CN1912715A (en) | 2007-02-14 |
| CN100529908C CN100529908C (en) | 2009-08-19 |
Family
ID=37721681
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006101111825A Expired - Fee Related CN100529908C (en) | 2005-08-10 | 2006-08-10 | Backlight device |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP4548839B2 (en) |
| CN (1) | CN100529908C (en) |
| TW (1) | TW200706801A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5311608B2 (en) * | 2007-09-05 | 2013-10-09 | 日立コンシューマエレクトロニクス株式会社 | Video display device |
| JP4906643B2 (en) * | 2007-09-07 | 2012-03-28 | 株式会社 日立ディスプレイズ | Liquid crystal display |
| JP2009238674A (en) * | 2008-03-28 | 2009-10-15 | Sumitomo Chemical Co Ltd | Surface light source device and light-transmitting image display device |
| WO2011062023A1 (en) * | 2009-11-19 | 2011-05-26 | シャープ株式会社 | Lighting device, display device, and television receiving device |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0627463A (en) * | 1991-02-12 | 1994-02-04 | Sharp Corp | Liquid crystal display device |
| JPH0821918A (en) * | 1994-07-05 | 1996-01-23 | Nisshin Koki Kk | Surface state light emitting device |
| JP2001297613A (en) * | 2000-04-14 | 2001-10-26 | Koichi Matsui | Directly under illumination device |
| JP2002169478A (en) * | 2000-11-29 | 2002-06-14 | Koichi Matsui | Directly under type illuminator |
| JP2002182579A (en) * | 2000-12-15 | 2002-06-26 | Koichi Matsui | Directly downward type lighting device |
| JP2002196326A (en) * | 2000-12-26 | 2002-07-12 | Hitachi Ltd | Liquid crystal display device |
| JP2004102119A (en) * | 2002-09-12 | 2004-04-02 | Kodama Chemical Industry Co Ltd | Reflector for direct backlight of liquid crystal display device |
| JP2004265681A (en) * | 2003-02-28 | 2004-09-24 | Koichi Matsui | Direct illumination device |
| JP2005024746A (en) * | 2003-06-30 | 2005-01-27 | Stanley Electric Co Ltd | Mirror for backlight |
| JP2005150037A (en) * | 2003-11-19 | 2005-06-09 | Sony Corp | Planar lighting device and display using it |
-
2005
- 2005-08-10 JP JP2005232260A patent/JP4548839B2/en not_active Expired - Fee Related
-
2006
- 2006-06-20 TW TW095122184A patent/TW200706801A/en unknown
- 2006-08-10 CN CNB2006101111825A patent/CN100529908C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| TW200706801A (en) | 2007-02-16 |
| JP2007048614A (en) | 2007-02-22 |
| CN100529908C (en) | 2009-08-19 |
| JP4548839B2 (en) | 2010-09-22 |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090819 Termination date: 20130810 |