CN1576995A - Straight downward back light device - Google Patents
Straight downward back light device Download PDFInfo
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- CN1576995A CN1576995A CN 200410062369 CN200410062369A CN1576995A CN 1576995 A CN1576995 A CN 1576995A CN 200410062369 CN200410062369 CN 200410062369 CN 200410062369 A CN200410062369 A CN 200410062369A CN 1576995 A CN1576995 A CN 1576995A
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Abstract
To suppress increase in weight of overhead backlight. In the overhead backlight where a light source 7 is arranged behind a light diffusion surface member 9, the light diffusion surface member 9 constituted only of a sheet material of less than 1 mm thickness, and the sheet material 9 includes a low transmittance diffusion sheet where the total light transmittance is 10-50%.
Description
Technical field
The present invention is about a kind of Staight downward type backlight device.
Background technology
Staight downward type backlight device is to use as the back lighting of liquid crystal indicator etc., generally is the light source that is made of cold-cathode tube in the configuration of the behind of diffuser plate and constituting.Diffuser plate is to be mixed into diffusant and to form in the synthetic resin material, being used for the light that light source sends being spread and forming roughly homogeneous light emitting area, is to be used for one of important component that keeps the luminous grade of back lighting device, the liquid crystal panel grade when liquid crystal indicator is used.
When resembling large-scale liquid crystal indicator like this, when needing large-scale back lighting device, the volume that enlarges plate increases, and product weight increases.For example, the diffuser plate weight of the back lighting device that 20 inches pictures are used is 350g, and the diffuser plate of the back lighting device of using to 30 inches pictures just is 530g, does not meet light-weighted requirement.
The spy of [patent documentation 1] Japanese Patent Laid Open Publication opens flat 7-64084 communique
Summary of the invention
The objective of the invention is to suppress the increase of the product weight of Staight downward type backlight device.
The present invention is the Staight downward type backlight device that a kind of behind at light diffusingsurface member is provided with light source, it is characterized in that: aforementioned lights diffusingsurface member only is made of the sheeting of the not enough 1mm of thickness, and comprises in the aforementioned sheeting that full light transmittance is 10～50% low-transmittance diffusion thin slice.
Light diffusingsurface member is not as known technology, adopts thickness to reach several millimeters diffuser plate, and only is made of the sheeting of the not enough 1mm of thickness, so even big pictureization also is a light weight.
And employed diffusion thin slice in known back lighting device is that full light transmittance is than higher (more than 80%) for the raising briliancy employed (briliancy improves with the diffusion thin slice) with the diffuser plate combination.Therefore, if as known technology, only will use as light diffusingsurface member with the diffusion thin slice that diffuser plate is used in combination, then can't obtain sufficient diffusion effect, clearly residual have make lamp straight to go up that the position brightens and the lamp shadow of deepening (lampimage) between lamp, can not obtain good luminous grade.
To this, in the present invention, adopt full light transmittance low than known technology, it is 10～50% low-transmittance diffusion thin slice, so position on light source straight, the light Be Controlled that sees through the diffusion thin slice must be lower, and the light that sees through is spread because of the light diffusion of diffusion thin slice.Therefore, though, lamp shadow is enhanced for thin diffusion thin slice.
And, aforementioned low-transmittance diffusion thin slice, its turbidity (haze) value is 70～100% preferable, in this case, lamp shadow is further improved.
And, Staight downward type backlight device of the present invention, it is the Staight downward type backlight device that a kind of behind of the light diffusingsurface member that constitutes at the sheeting by the not enough 1mm of thickness is provided with light source, it is characterized in that: do not produce deflection in order to make aforementioned sheeting, be equipped with this sheeting is applied tension force and holds the support member of supporting.
By sheeting is held support,, also can prevent the deflection of sheeting even light diffusingsurface member is a sheeting.
For sheeting is applied tension force, aforementioned support member is by framework, set most individual tension force are bestowed member and constituted good on aforesaid frame for most positions direction to the face of sheeting outside of the thin slice surrounding edge portion of aforementioned sheeting is held.
In addition, Staight downward type backlight device of the present invention is the Staight downward type backlight device that a kind of behind of the light diffusingsurface member that constitutes at the sheeting by the not enough 1mm of thickness is provided with light source, and it is characterized in that: the edge part at aforementioned sheeting is provided with reinforced bulkhead.Light diffusingsurface member is not as known technology, adopts thickness to reach several millimeters diffuser plate, and only is made of the sheeting of the not enough 1mm of thickness, so even big pictureization also is a light weight.And, because be provided with reinforced bulkhead, so can prevent the deflection of sheeting at the edge part of sheeting.
As utilize the present invention, because of light diffusingsurface member is thin, so can suppress the increase of the product weight of Staight downward type backlight device.
Description of drawings
Fig. 1 is the oblique view of the Staight downward type backlight device except upper ledge.
Fig. 2 is the decomposition profile diagram of Staight downward type backlight device.
Figure 3 shows that the concept map of the scattered reflection state of light.
Fig. 4 is the oblique view of upper ledge.
Fig. 5 is the sectional drawing about the Staight downward type backlight device of the 2nd example (except upper ledge).
Fig. 6 is the sectional drawing about the Staight downward type backlight device of the 3rd example (except upper ledge).
Fig. 7 is the oblique view about the thin slice that has reinforced bulkhead of the 3rd example.
Fig. 8 is the sectional drawing about the Staight downward type backlight device of the 4th example.
Fig. 9 is the exploded perspective view about the Staight downward type backlight device of the 4th example.
Figure 10 shows that the expanded view of buckling state of the projection of the hole of diffusingsurface member of short brink and lower frame.
Figure 11 shows that the expanded view of buckling state of the projection of the hole of diffusingsurface member of long side and lower frame.
Figure 12 is the oblique view of upper ledge.
1: Staight downward type backlight device
2: lower frame
3: upper ledge
4: bottom surface sections
4a, 5a: light reflection surface
5: side surface part
7: light source
9: light diffusingsurface member (low-transmittance diffusion thin slice; Sheeting)
9a, 9b, 9c, 9d: the limit of diffusion thin slice
11: spring (tension force is bestowed member)
12: mounting hole
13: the gap
14: window portion
15: window frame
15a, 15b: inboard
15c: protuberance
16: side surface part
20: briliancy improves with the diffusion thin slice
20b, 20c, 20d: notch part
21: lenticular sheet
30: reinforced bulkhead
31: the bight
51: support facial
51a: the 1st minor face is supported facial
51b: the 2nd minor face is supported facial
51c: the 1st long limit is supported facial
51d: the 2nd long limit is supported facial
52b, 52c, 52d: projection
53: double-sided belt
91b, 91c, 91d: hole
L1, L2, L3, L4: light
Embodiment
Utilize diagram that example of the present invention is described below.
Fig. 1～Figure 4 shows that Staight downward type backlight device 1 about the 1st example.This Staight downward type backlight device 1 is suitable as the back lighting device that liquid crystal indicator is used.Back lighting device 1 comprises lower frame (after-frame) 2 as lampshade, is installed in the upper ledge (preceding frame) 3 on this lower frame 2, and utilizes the framework of these two frame 2,3 constituent apparatus.
In the inside of lower frame 2, most light sources 7 are set up in parallel at certain intervals.Opening part on lower frame 2 is provided with light diffusingsurface member 9.Light from the set light source 7 in the behind of light diffusingsurface member 9 sends is radiated on the light diffusingsurface member 9, makes this light diffusingsurface member 9 become light-emitting area.The light of wire or point-like is spread at light diffusingsurface member 9, thereby the roughly uniform planar light of light intensity in the formation face shines the liquid crystal panel of liquid crystal indicator.
The inner face of lower frame 2 (the inner face 4a of bottom surface sections 4 also has the inner face 5a of side surface part if desired) is used as light reflection surface.Here light reflection surface 4a, 5a is diffusely reflecting surface, is positioned at the behind of light source 7 at least, and light is reflected to light diffusingsurface member 9 sides.Specifically, on lower frame inner face 4a, 5a, the reflecting plate of white is set or applies white coating, form diffusely reflecting surface.
Adopt the diffusion thin slice as light diffusingsurface member 9.This diffusion thin slice is the sheeting of the not enough 1mm of thickness.Be limited to about 0.1mm better following being limited to about 0.2mm under thin slice 9 thickness preferable.And, be limited to about 0.8mm on thin slice 9 preferable, be limited to about 0.3mm on better.Specifically, the thickness of thin slice 9 can be about 0.2mm.Here, as light diffusingsurface member 9, used thickness does not reach several millimeters and the big diffuser plate of weight.Therefore, the lightweight of back lighting device 1 is possible.And, owing to omitted the diffusion layer that needs more resin material, so can reduce material cost.
The full light transmittance of diffusion thin slice 9 is 10～50% low-transmittance.Be limited to 20% under transmittance better, be limited to 40% on transmittance better.Specifically, transmittance can be about 30%.Diffusion thin slice 9 can by with transparent resins such as PET, PC, propylene as base material, and on the transparent base surface, apply diffusant, make substrate surface form diffusion layer (magnetic bead (bead) coating) and constitute.Perhaps, also can form by sneaking into diffusant in thin slice inside.Make diffusion thin slice 9 be low-transmittance, amount that can be by adjusting diffusant also utilizes diffusant that the light quantity that is absorbed is adjusted, or improves the reflectivity of sheet surface and realize.
And the diffuser plate 9 here is used to improve lamp shadow, so turbidity (haze) value is 70～100%.Improve turbidity value, can be by the coating diffusant, or to make sheet surface be fine concavo-convex etc. reaching.
Because the transmittance of diffusion thin slice 9 below 50%, so shine the more than half of the light L1 of diffusion on the thin slice 9 from light source 7, can directly not see through.That is, the light L2 that directly sees through compares Be Controlled with full light amount must be lower, and the light that sees through is spread because of the light diffusion of diffusion thin slice 9.So the straight position of going up that can prevent lamp forms unusual high briliancy, and as known diffuser plate, even the little mitigation that also can seek lamp shadow of thickness.
In addition, do not see through a part of L3 of the light of diffusion thin slice 9, be reflected, and finally penetrate from diffusion thin slice 9 by the secondary reflection again that utilizes reflecting surface 4a, 5a to reflecting surface 4a side.And, when by improving diffusion thin slice 9 when the reflectivity of the face 9a of lamp one side reduces transmittance, can make the major part of the light that does not see through form reflected light L3, efficient is good.
As shown in Figure 3, the reflected light L3 of diffusion thin slice 9 spreads the incident light L1 broadening of thin slice 9 because of the diffusion of diffusion thin slice 9.By secondary reflection again and towards diffusion thin slice 9, the part of reflected light L4 is spread by diffusion thin slice 9 and is penetrated the light L3 of this broadening again by reflecting surface 4a.In addition, if reflecting surface 4a, 5a are diffusely reflecting surface, then can obtain better diffusion effect.
Like this, the light that light source 7 sends is suppressed from the amount that diffusion thin slice 9 directly penetrates, so there is more light in the lower frame volume inside, to reflect repeatedly and spread, and be apparent in as the enough wide light that sends from light source 7 on the surface of diffusion thin slice 9, can obtain the light-emitting area that lamp shadow is relaxed.
That is to say,, and only utilize thin diffusion thin slice, also can reduce transmittance, thereby can similarly relax lamp shadow, and can carry out the lightweight of back lighting device 1 with diffuser plate even without diffuser plate.Specifically, in the back lighting device that 20 inches liquid crystal indicators are used, can reach the lightweight of 300g front and back, and in the back lighting device that 30 inches liquid crystal indicators are used, can reach the lightweight of 500g front and back.
As shown in Figures 1 and 2, in order to make the not deflection downwards of thin diffusion thin slice 9, diffusion thin slice 9 its surrounding edge portions are held by direction outside face by spring 11.Specifically, the central portion on the bight and the long limit of the diffusion thin slice 9 of rectangle is equipped with an end of spring 11, and the other end of spring is installed on the lower frame 2 top of side surface part 5 ().In addition, on diffusion thin slice 9, be formed with the mounting hole 12 of an end that is used for mounting spring 11.Mounting hole 12 and neighbouring (part of being held by spring 11) thereof in order to prevent the damaged or elongation of thin slice, are inserted reinforcement device such as round end accessory and are strengthened to good.In addition, formed rectangle spreads the top opening of thin slice 9 less than the rectangle of lower frame 2, and in the surrounding edge and the gap 13 between the lower frame side surface part 5 of diffusion thin slice 9, disposes spring 11.
11 pairs on spring diffusion thin slice 9 applies tension force, and forms the tension force that this diffusion thin slice 9 is imposed tension force and bestow member, and utilizes spring 11 can prevent thin deflection of spreading thin slice 9.And, because spring 11 is installed on the lower frame 2, can be supported by lower frame 2 by spring so spread thin slice 9.Like this, spring 11 and lower frame 2 form diffusion thin slice 9 are applied tension force and holds the support member of supporting.And, when utilizing spring 11 to hold to support, though thin slice 9 because of through the time change to expand also and can prevent deflection, and also can be when shrinking by the stretching, extension of spring 11 as reply.That is, no matter thin slice 9 expands is shunk, and all can utilize spring force to keep suitable tension force.
The center C that spring 11 is arranged at respectively with diffusion thin slice 9 is on benchmark and the position respect to one another, and it is the center of lower frame 2 that diffusion thin slice 9 is remained on fixing support automatically.Like this, diffusion thin slice 9 utilizes spring 11 automatically to carry out the center adjustment, and spring 11 constitutes the center adjusting mechanism.Therefore, even diffusion thin slice 9 is because of heat or suction etc. expands contraction, diffusion thin slice 9 also can automatically be carried out the center adjustment, can not produce big departing to the relative position of lower frame 2 (light source 7).Therefore, (hide the light that lamp is directly gone up the position when on diffusion thin slice 9, forming light curtain (lightingcurtain) by printing morely, less hide the image etc. of the light between lamp and implement, be used to seek the mitigation of lamp shadow) time, can keep the position of light curtain and the position of light source 7.
Even also there is the problem of shrinking because of expansion hot or that suction is caused in known diffuser plate,, can produce loosening so diffuser plate will leave the gap when configuration.When applying the light curtain on this diffuser plate, the position of the position of light curtain and light source 7 is because of the loosening change of diffuser plate, so be difficult to realize the optimal design of light curtain position.
To this, if resemble this example like this, the diffusion thin slice 9 that is formed with the light curtain is carried out the center adjustment automatically, but then almost fixed ground keeps the position of light curtain and the position of light source 7, so can carry out optimal design to the position of light curtain, and obtain meeting the luminous grade of design easily.
As Fig. 2 and shown in Figure 4, on the upper ledge of in lower frame 2, being installed 3, be provided with roughly corresponding or spread the little window portion 14 of thin slice 9 with the size that spreads thin slice 9.Even the effect of window portion 14 is that upper ledge 3 is covered on the top opening of lower frame 2, also can make from light and pass through as the diffusion thin slice 9 of light-emitting area, here, window portion 14 forms as the hole on the rectangle.
And, on the inboard 15a of window frame portion 15, maintain liquid crystal panel, and be positioned at the form of window portion 14 and be configured with liquid crystal panel.That is, upper ledge 3 has played the effect of the maintenance body of liquid crystal panel, forms the face side framework of liquid crystal indicator.
In addition, be vertically installed with side surface part 16, undertaken chimericly by side surface part 16 and the lower frame 2 that makes upper ledge 3, two frames 2,3 can be formed one from 4 limits of upper ledge 3.According to needing, two frames 2,3 utilize stationary installation such as screw to be fixed securely.
And upper ledge has also played the effect of the framework that is used to keep liquid crystal panel.
Figure 5 shows that Staight downward type backlight device 1 (except upper ledge) about the 2nd example.Here, on low-transmittance diffusion thin slice 9, dispose the otpical leaf 20,21 of non-low-transmittance diffusion thin slice.Otpical leaf 20,21 also is the sheeting of the not enough 1mm of thickness.Comprise that as otpical leaf 20,21 briliancy improves with diffusion thin slice 20 and lenticular sheet 21.Briliancy improves with magnetic bead (bead) coating of diffusion thin slice 20 by utilizing sheet surface etc., will spread the diffusion light that thin slice 9 penetrates from low-transmittance and be converted to vertical direction, thereby play the effect of raising briliancy.And lenticular sheet 21 also improves briliancy to be used, and utilizes fine lens to carry out light harvesting and briliancy is improved.
These otpical leafs 20,21 have more than and are coated over above the low-transmittance diffusion thin slice 9, but spread thin slice 9 similarly with low-transmittance, are held by spring 11.Because of otpical leaf 20,21 is also held, thereby can prevent the deflection of thin slice 20,21.The mounting hole 12 that one end of spring 11 is mounted is formed at the same position of most thin slices 9,20,21 of coincidence, becomes common mounting hole 12.
In addition, Fig. 5 having been omitted the place of explanation, is identical with the back lighting device of Fig. 1～shown in Figure 4.
Figure 6 and Figure 7 is the Staight downward type backlight device 1 (except upper ledge) about the 3rd example.At the edge part of low-transmittance diffusion thin slice 9, be provided with whole rectangular reinforced bulkhead 30.Reinforced bulkhead 30 is to be used for applying rigidity on easy 4 limits of the thin slice 9 of deflection, makes it be difficult to produce deflection.By reinforced bulkhead 30 is set,, also can alleviate deflection even thin slice 9 is not applied tension force.
Reinforced bulkhead 30 is disposed at 4 limits of thin slice 9 by the member that synthetic resin etc. is had rigidity, and whole rectangular shape is constituted.Reinforced bulkhead 30 forms the rod member of section square (hollow), and each rod member utilizes sticker etc. to fix respectively on 4 limits of thin slice 9.The material that reinforced bulkhead 30 is used can use with the thermal expansivity of thin slice 9 approachingly, and prevents to produce wrinkle etc. by thermal expansion on thin slice.In addition, when the size hour (when being used for 8 inches liquid crystal indicators) of back lighting device, there is no need to consider especially the thermal expansivity of reinforced bulkhead 30.
4 reinforced bulkheads 30,30,30,30 that 4 limits are set, separated from one another and be separately positioned on 31 places, four bights of thin slice 9.So, the frame 30 of all rectangular shapes is partly interrupted, thereby tackles the thermal expansion of thin slice 9 easily.
As shown in Figure 6, have reinforced bulkhead thin slice 9 so that reinforced bulkhead 30 be positioned in the form on the lower frame 2 and reinforced bulkhead 30 be provided with down.
Other otpical leaf can be set on thin slice 9 in addition.Other otpical leaf utilizes upper ledge 3 and thin slice 9 and is held fixing.
Fig. 8～Figure 12 shows that Staight downward type backlight device about the 4th example.
The diffusingsurface member is the diffusion sheet 9 of rectangle, and its 1 limit 9a is fixing by adhesion to lower frame 2, and formed hole 91b, 91c, 91d are articulated on the lower frame 2 and fix on the diffusion thin slice 9 by making for other 3 limit 9b, 9c, 9d.
Here, light diffusingsurface member promptly spreads thin plate 9 (the not enough 1mm of thickness), in order to prevent deflection, is installed on the lower frame 2 (after-frame) with the state that applies the tension force of direction outside the face.In addition, when because of reasons such as the size of back lighting device are little,, also can not apply tension force even also deflection can not produced for thin diffusingsurface member 9 time.
In addition, in the following description, will support in facial 51, support face to be called minor face for 2 of short brink and support facial 51a, 51b, support face to be called long limit for 2 of long side and support facial 51c, 51d.And, when 2 minor faces of needs difference address are supported facial 51a, 51b, being called the 1st minor face respectively supports facial 51a, the 2nd minor face to support facial 51b, when facial 51c, 51d are supported in 2 long limits of needs difference address, be called the 1st long limit respectively and support facial 51c, the 2nd long limit to support facial 51d.And, when whole 4 supports of general designation are facial, only are called and support facial 51.
Support in facial 51 at 4 of lower frame 2, support to be formed with on facial 51b, 51c, the 51d at 3 and be used for projection 52b, the 52c, the 52d that articulate with aforementioned apertures 91b, 91c, 91d.These projections 52b, 52c, 52d have cut the part of lower frame 2 and formed.
9 pairs of diffusingsurface members do not form facial i.e. the 1st minor face of support of projection 52b, 5c, 52d and support facial 51a, utilize double-sided belt 53 to be stuck.
In addition, also can not utilize double-sided belt 53, support on the facial 51a and utilize sticker that diffusingsurface member 9 is sticked on the 1st minor face.And, also can support to form projection on the facial 51a, and the pairing hole of this projection is formed on the diffusingsurface member 9 at the 1st minor face.
The 2nd minor face is supported the projection 52b of facial 51b, and utilize between the 1st minor face 9a of the diffusingsurface member 9 that double-sided belt 53 is stuck fixing, form so that diffusingsurface member 9 is held along the direction parallel with the long side direction of this diffusingsurface member is articulated on the 91b of hole.
And each projection 52c, 52d of facial 51c, 51d supported on long limit, and the form so that diffusingsurface member 9 is held along the direction parallel with the short side direction of this diffusingsurface member is articulated in hole 91c, 91d last (with reference to the flechette-type symbol of Fig. 8).
Like this,, can on diffusingsurface member 9, apply the tension force of direction outside face under the state of holding, prevent diffusingsurface member 9 sagging in lower frame 2, so can form thin diffusingsurface member 9 by diffusingsurface member 9 is installed on the lower frame 2.
Here, the tension force that double-sided belt 53 and projection 52b, 52c, 52d are equivalent to be arranged on the framework 2 is bestowed member, being that most positions directions outside the face of light sheet material of the thin plate surrounding edge portion of diffusingsurface member 9 are held with light sheet material.And, be formed with the framework 2 of double-sided belt 53 and projection 52b, 52c, 52d, form diffusion thin slice 9 is applied tension force and holds the support member of support.
In addition, in each hole 91b, 91c, 91d,, also can on diffusingsurface member 9, install and be used for reinforcement utensil that hole 91b, 91c, 91d are strengthened in order to prevent breakage, thin diffusingsurface member 9 is not directly contacted with projection 52b, 52c, 52d, and the reinforcement utensil is contacted with projection.
If considering sheeting is the linear expansion coefficient of diffusingsurface member 9, then the swell increment of the long side direction that causes because of temperature rising etc. is big than the swell increment of short side direction.Hole 20b, 20c, 20d can insert in order to make projection 52b, 52c, 52d, formation is than this projection 52b, size that 52c, 52d are big, but consider the difference of the expansion situation that causes because of aforesaid linear expansion coefficient, on diffusingsurface member 9, among formed hole 20b, 20c, the 20d, be formed at the hole 91b of minor face and varying in size of the hole 91c, the 91d that are formed at long limit.
That is, as shown in figure 10, the hole 91b that is formed at minor face be related to and projection 52b between the gap, it is big to form a kind of gap cd-1 that is parallel to long side direction, is parallel to the little form of gap cd-2-1, cd-2-2 of short side direction.
And, as shown in figure 11, hole 91c, the 91d that is formed at long limit be related to and projection 52c, 52d between the gap, it is big to form a kind of gap cc-1-1, cc-1-2 (cd-1-1, cd-1-2) that is parallel to long side direction, is parallel to the little form of gap cc-2 (cd-2) of short side direction.
On diffusingsurface member 9, also mounting has other otpical leaf 20.This otpical leaf 20 also can utilize with the same structure of diffusingsurface member 9 and hold support, but the simplification in order to construct and to assemble here, 20 of otpical leafs be positioned in diffusingsurface member 9 above.
In addition, on otpical leaf 20, in order to avoid projection 52b, 52c, 52d, be formed with being used to place notch part 20b, 20c, the 20d of projection.
As Fig. 8 and shown in Figure 12, on the inboard 15b of the window frame portion 15 of upper ledge (preceding frame) 3, be provided with the protuberance 15c that is used to push thin slice (diffusingsurface member 9 and otpical leaf 20).By thin slice 9,20 being clamped between the support face 51 of this protuberance 15c and lower frame 2, can positively keep thin slice 9,20.And, because protuberance 15c is provided with from the inboard 15b of window frame portion is outstanding, so, also can not be subjected to the obstruction of this projection 52b, 52c, 52d and clamping thin slice 9,20 even the projection 52b of lower frame 2,52c, 52d are outstanding than otpical leaf 20.
And protuberance 15c adopts a kind of 20 couples of protuberance 15c of thin slice that make when flexible generations of thin slice 20 to slide, and do not hinder thin slice 20 flexible be shaped as good, so protuberance 15c contacts preferable to thin slice 20 for some contact or line.For forming the line contact, as shown in figure 12, can make protuberance 15c form half round post.And, for forming the some contact, can make protuberance 15c form semisphere.
When protuberance 15c when thin slice 20 is carried out the shape of line contact, in order not hinder the flexible of thin slice 20 as much as possible, the direction of the line of this line contact, parallel with the direction on the limit of the thin slice 20 that utilizes this protuberance 15c to push for good.That is, as shown in figure 12, the protuberance 15c that long side is set, its long side direction towards with the parallel direction in long limit, and the set protuberance 15c of short brink, its long side direction is good towards the direction parallel with minor face.
Claims (6)
1. a Staight downward type backlight device is the Staight downward type backlight device that light source is set in the behind of light diffusingsurface member,
It is characterized in that:
Aforementioned lights diffusingsurface member only is made of the sheeting of the not enough 1mm of thickness, and
Comprise in the aforementioned sheeting that full light transmittance is 10～50% low-transmittance diffusion thin slice.
2. Staight downward type backlight device as claimed in claim 1 is characterized in that: aforementioned low-transmittance diffusion thin slice, its turbidity (haze) value is 70～100%.
3. Staight downward type backlight device as claimed in claim 1 or 2 is characterized in that: do not produce deflection in order to make aforementioned sheeting, be equipped with this sheeting is applied tension force and holds the support member of supporting.
4. Staight downward type backlight device as claimed in claim 3 is characterized in that: aforementioned support member is by framework, set most individual tension force are bestowed member and constituted on aforesaid frame for most positions direction to the face of sheeting outside of the thin slice surrounding edge portion of aforementioned sheeting is held.
5. Staight downward type backlight device is the Staight downward type backlight device that the behind of the light diffusingsurface member that constitutes at the sheeting by the not enough 1mm of thickness is provided with light source,
It is characterized in that:
In order to make aforementioned sheeting not produce deflection, be equipped with this sheeting is applied tension force and holds the support member of supporting.
6. Staight downward type backlight device is the Staight downward type backlight device that the behind of the light diffusingsurface member that constitutes at the sheeting by the not enough 1mm of thickness is provided with light source,
It is characterized in that:
Edge part at aforementioned sheeting is provided with reinforced bulkhead.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003280222A JP2005044747A (en) | 2003-07-25 | 2003-07-25 | Overhead backlight |
| JP2003280222 | 2003-07-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1576995A true CN1576995A (en) | 2005-02-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410062369 Pending CN1576995A (en) | 2003-07-25 | 2004-07-09 | Straight downward back light device |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2005044747A (en) |
| CN (1) | CN1576995A (en) |
| TW (1) | TWI263840B (en) |
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| CN104570437A (en) * | 2013-11-01 | 2015-04-29 | 京东方科技集团股份有限公司 | Fixing device, backlight source and display device |
| CN112946952A (en) * | 2019-12-11 | 2021-06-11 | 南京瀚宇彩欣科技有限责任公司 | Display device and backlight module |
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| WO2009142057A1 (en) * | 2008-05-21 | 2009-11-26 | シャープ株式会社 | Light source device and display device |
| EP2294478A2 (en) * | 2008-05-30 | 2011-03-16 | 3M Innovative Properties Company | Suspended optical film |
-
2003
- 2003-07-25 JP JP2003280222A patent/JP2005044747A/en active Pending
-
2004
- 2004-05-24 TW TW93114607A patent/TWI263840B/en not_active IP Right Cessation
- 2004-07-09 CN CN 200410062369 patent/CN1576995A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102628564A (en) * | 2011-12-30 | 2012-08-08 | 友达光电股份有限公司 | Direct type backlight module and display device using same |
| CN104570437A (en) * | 2013-11-01 | 2015-04-29 | 京东方科技集团股份有限公司 | Fixing device, backlight source and display device |
| CN112946952A (en) * | 2019-12-11 | 2021-06-11 | 南京瀚宇彩欣科技有限责任公司 | Display device and backlight module |
| CN112946952B (en) * | 2019-12-11 | 2023-01-06 | 南京瀚宇彩欣科技有限责任公司 | Display device and backlight module |
Also Published As
| Publication number | Publication date |
|---|---|
| TWI263840B (en) | 2006-10-11 |
| JP2005044747A (en) | 2005-02-17 |
| TW200510865A (en) | 2005-03-16 |
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