CN101509609A - Surface light source device - Google Patents
Surface light source device Download PDFInfo
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- CN101509609A CN101509609A CNA2008101771720A CN200810177172A CN101509609A CN 101509609 A CN101509609 A CN 101509609A CN A2008101771720 A CNA2008101771720 A CN A2008101771720A CN 200810177172 A CN200810177172 A CN 200810177172A CN 101509609 A CN101509609 A CN 101509609A
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- light source
- light
- reflection
- straight tube
- passing board
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133605—Direct backlight including specially adapted reflectors
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
- Liquid Crystal (AREA)
Abstract
To provide a surface light source device capable of emitting uniform light in the front face direction at high luminance even though the number of arrangements of light sources is lessened. In the surface light source device 1 in which a plurality of light sources 2 are mutually arranged to space in certain spacings and each deflection structure plate 3 changing the direction of light emitted from the light source is arranged at the front side of the light source 2, the deflection structure plate 3 is formed to emit light directly incident from two adjacent light sources toward the front face side direction a of the normal direction of the deflection structure plate 3 at a range corresponding to a range between two adjacent light sources 2, 2 in the deflection structure plate, and a reflective surface section 7 for reflecting light emitted from the light source 2 to a back side to the light source 2 or in the direction passing a near position of the light source 2 is arranged at the back side of the light source 2.
Description
Technical field
Even it is few to the present invention relates to the light source number, also can be at the planar light source device of frontal with the uniform light of high brightness outgoing, even and the light source number few, also can evenly show the transmission image display device of bright image at frontal.
Background technology
As transmission image display device, for example,, be well-known as the structure of the planar light source device of configuration full run-down type backlight in the rear side of the transmission type image display part that constitutes with transmissive type liquid crystal panel etc.As above-mentioned planar light source device, known planar light source device: in its lamp box with following structure, a plurality of light sources are reserved each other at interval and are disposed, front face side at these light sources disposes light diffusing sheet simultaneously, and the front face side at this light diffusing sheet disposes prism element (opening flat 7-141908 communique (paragraph 0012, Fig. 1) with reference to the spy) again.
, based on the consideration of power saving, the light source number that constitutes planar light source device is preferably the least possible, if but reduce the light source number, then brightness will descend.Therefore, as planar light source device, even requirement light source number less also can be with the uniform light of high brightness outgoing.
To this, in the structure of the planar light source device that above-mentioned document is put down in writing, prism element is between 2 adjacent light sources, constitute the light that makes from a nearer side's light source and can make its front face side outgoing to normal direction (vertical direction), but, do not do any consideration for exit direction from the light of the opposing party's light source.For example, if the few design of light source configurable number then can not be guaranteed fully high brightness on frontal.
The present invention is the invention of doing in view of such technical background, and its purpose is, even provide the light source configurable number few, also can be on frontal with the planar light source device of the uniform light of high brightness outgoing; Even and the configured light sources number is few, also can be on frontal the even transmission image display device of the image of exhibit high brilliance.
In order to reach above-mentioned purpose, the invention provides following device.
[1] a kind of a plurality of light sources, light-passing board and facial planar light source device of reflection of being provided with, wherein:
These a plurality of light sources are configured to leave each other at interval,
In this planar light source device, this light-passing board is configured in the front face side of this light source, the facial rear side that is configured in this light source of this reflection,
This light-passing board is made of portion between straight top of light source and light source, and portion constitutes and makes the normal direction that all can change to this light-passing board from the direction of light of 2 adjacent direct incidents of light source between this light source,
This reflection is facial will nearby reflect the position to this light source or its from the light of this light source to the rear side emission.
[2] preceding paragraph 1 described planar light source device, wherein:
These a plurality of light sources are a plurality of straight tube-like light sources that are parallel to each other,
This reflection is facial to be provided with the curved-surface reflection side more than 1 that nearby has the center of curvature at this straight tube-like light source or its on the position, perhaps
The facial a plurality of plane reflection faces that are configured to surround this straight tube-like light source that are provided with of this reflection, in the cross sectional view on the face of the length direction that is orthogonal to this straight tube-like light source, with the summit at the two ends of these plane reflection faces all in bag minimums imaginary circle be centered close to nearby position of this straight tube-like light source or its.
[3] preceding paragraph 2 described planar light source devices, wherein:
In the cross sectional view on the face of the length direction that is orthogonal to this straight tube-like light source, this reflection is facial, and to form covering be roughly 180 ° the scope at center with the back side of this straight tube-like light source, the light that sends to the roughly 180 ° of scopes that with its back side are the center from this straight tube-like light source is by the facial reflection of this reflection, reflexes near this straight tube-like light source or its.
[4] preceding paragraph 2 or 3 described planar light source devices, wherein:
In the cross sectional view on the face of the length direction that is orthogonal to this straight tube-like light source, if the distance of establishing between this light-passing board and this straight tube-like light source center position is " H ", this adjacent straight tube-like light source distance between the center each other is " L ", and also pass through the straight line of this straight tube-like light source center position as the 1st imaginary line with the normal direction that is parallel to this light-passing board, with the straight line of the direction that is parallel to this light-passing board and the center by this straight tube-like light source as the 2nd imaginary line, then this straight tube-like light source nearby the scope of position be that vertical range with the 1st imaginary line is below 0.15L, with the scope of vertical range below 0.15H of the 2nd imaginary line, wherein remove the zone that this straight tube-like light source exists.
[5] any described planar light source device in the preceding paragraph 1～4, wherein, this reflection face has will be from the structure of this light source to light position reflection near this light source of rear side emission.
[6] a kind of transmission image display device, any 1 described planar light source device and constituting in the rear side of transmission type image display part configuration preceding paragraph 1～5.
In the invention of [1], in portion between the light source of light-passing board and since can with from the light of these 2 adjacent direct incidents of light source (reflection and directly the light of incident) all to the normal direction outgoing of this light-passing board, therefore, even the configured light sources number is few, also can be with the uniform light of high brightness outgoing.That is, can illumination fully brightly on frontal.
Moreover, the rear side of light source be provided with from this light source to the light of rear side emission towards this light source or towards the reflection face of the nearby position reflection of this light source, owing to reflecting the reverberation that constitutes to the light of rear side emission by this reflection face from light source, with with send and be incident to light-passing board to front face side from this light source directly into approaching path, the path of the light that is incident upon light-passing board, therefore, this reverberation is to the direction outgoing of the normal direction that approaches light-passing board.Like this, not only send and directly into the light that is incident upon light-passing board to front face side, and can make from light source to the light of rear side emission via the facial reflection of reflection to the normal direction outgoing that approaches light-passing board from light source.That is, because reverberation also is used effectively and to front side direction outgoing, the brightness of the frontal of planar light source device is further improved.
On the other hand, in the structure that is not provided with about the reflecting surface of said structure, can not fully make full use of from the light of light source to the rear side emission.That is, almost can not effectively utilize the next normal direction outgoing of light of launching to rear side, thereby frontal can not obtain sufficient brightness from light source to light-passing board.
Form contrast therewith, in the present invention owing to be provided with as described above reflection face, can be on frontal the light of outgoing high brightness.
In the invention of [2], be under the situation of a plurality of straight tube-like light sources of being parallel to each other at light source, a) reflection facial by the center of curvature be positioned at this straight tube-like light source or its nearby the curved-surface reflection side more than 1 of position constitute, or b) reflection is facial is made of a plurality of plane reflection faces that are configured to surround this straight tube-like light source, in the cross sectional view on the face of the length direction that is orthogonal to this straight tube-like light source, with the summit at the two ends of these plane reflection faces all in bag the smallest imaginary circle be centered close to nearby position of this straight tube-like light source or its, therefore, the brightness of frontal is further improved.
In the invention of [3], in the cross sectional view on the face of the length direction that is orthogonal to this straight tube-like light source, the back side that the facial formation of this reflection covers with this straight tube-like light source is roughly 180 ° the scope at center, the light that sends to roughly 180 ° the scope that with its back side is the center from this straight tube-like light source, become by the facial reflection of this reflection and towards this straight tube-like light source or its light of position reflection nearby, therefore, not only from the light of light source to the rear side emission, and the light that sends to the zone, summary side of the left and right sides of light source also can be to the normal direction outgoing of light-passing board, thereby the brightness of frontal is improved more.
In the invention of [4],, the brightness of frontal is further improved owing to be the structure that the scope of position near the light source is limited to the particular range that approaches light source especially.
In the invention of [5],, the brightness of frontal is improved more owing to be provided with from the reflection face of this light source to light position reflection near this light source of rear side emission.
In the invention of [6], even provide the configured light sources number also can show the transmission image display device of bright image less to frontal.
Description of drawings
Fig. 1 is the schematic side view of an embodiment of expression transmission image display device of the present invention.
Fig. 2 is the schematic side view of an embodiment (the 1st embodiment) of expression planar light source device of the present invention.Among the figure, will send and directly into being incident upon light-passing board and representing with the solid line of band arrow to front face side from light source from the light path of the light of light-passing board outgoing.In addition, will represent with the dotted line of band arrow to the light path of the light of rear side emission from light source.
Fig. 3 is the side view of a part of light-passing board that amplifies the planar light source device of presentation graphs 2.
Fig. 4 amplifies the light source of planar light source device of presentation graphs 2 and side view nearby thereof.
Fig. 5 is the schematic side view of other embodiment of expression transmission image display device of the present invention.
Fig. 6 is the schematic side view of other embodiment (the 2nd embodiment) of expression planar light source device of the present invention.Among the figure, will send and directly into being incident upon light-passing board and representing with the solid line of band arrow to front face side from light source from the light path of the light of light-passing board outgoing.In addition, will represent with the dotted line of band arrow to the light path of the light of rear side emission from light source.
Fig. 7 amplifies the light source of planar light source device of presentation graphs 6 and side view nearby thereof.
Fig. 8 is the facial and side view nearby of reflection that amplifies another embodiment (the 3rd embodiment) of expression planar light source device of the present invention.
Fig. 9 is the facial and side view nearby of reflection that amplifies the another embodiment (the 4th embodiment) of expression planar light source device of the present invention.
Figure 10 is the schematic side view of structure of the planar light source device of expression comparative example 1.In this Figure 10, send and directly into being incident upon light-passing board and representing with the solid line of band arrow to front face side from the light path of the light of light-passing board outgoing from light source.In addition, represent with the dotted line of band arrow to the light path of the light of rear side emission from light source.
Figure 11 is expression from the light-passing board of embodiment 1 to the angular distribution (representing with solid line) of the brightness of the light of observer's outgoing with from the light-passing board of comparative example 1 curve map to the angular distribution (dotting) of the brightness of the light of observer's outgoing.
To be expression be made as the center with the front face side direction (a) of the normal direction of light-passing board to Figure 12, the energy of the light of outgoing is with respect to the curve map of the percentage (a few %) of the energy of whole emergent lights in specific shooting angle scope (+or-angular range of both sides), the result of embodiment 1 represents that with solid line the result of comparative example 1 dots.
[description of symbols]
1... planar light source device
2... light source
3... light-passing board
7... reflection is facial
7a... the 1st curved-surface reflection side
7b... the 2nd curved-surface reflection side
7c... plane reflection face
9,9A, 9B... summit
10... liquid crystal indicator (transmission image display device)
14... transmission type image display part
21... the 1st light source
22... the 2nd light source
23... the 3rd light source
24... the 4th light source
25... the 5th light source
91～94... corresponding region
A... the front direction of normal direction
G... the center of light source
Q... the 1st imaginary line
J... the 2nd imaginary line
U... imaginary circle
Y, Y1, the Y2... center of curvature
The center of Y3, Y4... imaginary circle
W... the light source scope (zone) of position nearby
Z... source region
The specific embodiment
In Fig. 1～Fig. 4, the liquid crystal indicator of an embodiment (the 1st embodiment) of transmission image display device of the present invention is shown.In Fig. 1, (10) are liquid crystal indicators, and (11) are liquid crystal cells, and (12) (13) are polarization plates, and (1) is planar light source device.Dispose polarization plates (12) (13) respectively in the both sides up and down of above-mentioned liquid crystal cell (11), constitute transmission type image display part (14) with these member of formation (11) (12) (13).
Above-mentioned planar light source device (1) is configured in the following side (rear side) of the polarization plates (13) of above-mentioned downside.This planar light source device (1) is provided with: be the open thin box-shaped lamp box (5) of rectangular-shaped upper face side (front face side) in plan view; Space in this lamp box (5) and a plurality of light sources (2) of disposing; Be configured in the light-passing board (3) of the upper side (front face side) of these a plurality of light sources (2).Also fixing above-mentioned light-passing board (3) is set, the open surface of above-mentioned lamp box (5) is blocked.
In the present embodiment, as above-mentioned light source (2), a plurality of straight tube-like light sources that are parallel to each other have been used.As the concrete example of this straight tube-like light source, fluorescent tube is for example arranged, but be not particularly limited in this.In addition, in the present embodiment, as above-mentioned light source (2), show the structure of using the 1st light source (21), the 2nd light source (22), the 3rd light source (23), the 4th light source (24) and the 5th light source (25) for ease of explanation, but being not particularly limited in such light source number, can be a plurality of more than 2.
Above-mentioned light-passing board (3) is to have to change to send from above-mentioned light source (2) and be incident to the plate of function of the direction of light of this light-passing board (3).In the present invention, this light-passing board (3) is made of portion between straight top of light source and light source.The straight top of so-called this light source is meant the part of the light parallel with the normal direction of this light-passing board from the direct incident of this light source, and portion is meant the straight top of the light source part in addition of this light-passing board between so-called this light source.In the present invention, constitute and make from directly the light of incident (for example, the light of the light path of representing by solid line in Fig. 2) all can be to front face side direction (a) outgoing of the normal direction of this light-passing board (3) adjacent to 2 light sources (2) (2) of portion between this light source.
The limit illustrates one by one with reference to Fig. 2 limit, above-mentioned light-passing board (3) constitutes, with the light source in adjacent the 1st light source (21) and the regional corresponding zone (91) between the 2nd light source (22) between in the portion, make that directly the light (F1) of incident (F2) all can be to front face side direction (a) outgoing of the normal direction of this light-passing board (3) from these adjacent 2 light sources (21) (22).Similarly, above-mentioned light-passing board (3) constitute with adjacent the 2nd light source (22) and the 3rd light source (23) between the light source in regional corresponding zone (92) between in the portion, make that directly the light (F2) of incident (F3) all can be to front face side direction (a) outgoing of the normal direction of this light-passing board (3) from these adjacent 2 light sources (22) (23).Moreover same structure is also adopted in other zone (93) (94) of above-mentioned light-passing board (3).
As shown in Figure 3, the back side of above-mentioned light-passing board (3) (face of light source side) (light entrance face) (3b) forms even surface in whole scope.
As Fig. 1, shown in 2, the front of above-mentioned light-passing board (3) (face of image displaying part side) (light-emitting face) (3a) by with adjacent the 1st light source (21) and the 2nd light source (22) between the zone (91) of this regional corresponding light-passing board, zone (92) with this regional corresponding light-passing board between adjacent the 2nd light source (22) and the 3rd light source (23), with the zone (93) of this regional corresponding light-passing board between adjacent the 3rd light source (23) and the 4th light source (24) and and 4 zone formations in the zone (94) of corresponding this light-passing board in adjacent the 4th light source (24) and the zone between the 5th light source (25), and these 4 zones (91) (92) (93) (94) all are divided into 30 zonules (Am separately; M=0,1,2,3,4,5 ... 27,28,29) (with reference to Fig. 2).Each zonule (Am; M=0～29) width all is 1000 μ m (1mm).
In above-mentioned each zonule, be in above-mentioned light source (2) directly over the zonule (A0) of position, promptly the light-emitting face on the straight top of light source (3a) is formed even surface as shown in Figure 3.Thereby, at this zonule (A0) because light entrance face (3b) and light-emitting face (3a) all are even surfaces, under the illumination former state of light source (2) incident to front face side direction (a) outgoing of the normal direction of light-passing board (3).
In addition, remaining 29 zonule (Am except that the above-mentioned zonule (A0) of above-mentioned light-passing board (3); M=1～29) be portion between light source, portion between this light source, light-emitting face (3a) constitutes cross sectional shape with leg-of-mutton prism as shown in Figure 3.Each zonule (Am; M=1～29) each 20 naturally of prism (three use shape) numbers.In addition, the interval (t of prism (triangle)
1, t
2..., t
28, t
29) all be 50 μ m.In addition, constitute each zonule (Am; The angle (α m, β m) that leg-of-mutton 2 hypotenuses of prism m=1～29) and normal (a) form is set on the value shown in the table 1.Moreover leg-of-mutton angle [alpha] m and angle beta m in the same cells territory are identical.That is, its cross sectional shape of triangle in the same cells territory all is identical.For example, the triangle of zonule A1 (prism) all is set at α 1=85.1 degree, β 1=24.2 degree, t1=50 μ m.
Table 1
| m | α m (degree) | β m (degree) | t m(μm) | m | α m (degree) | β m (degree) | t m(μm) |
| 1 | 85.4 | 23.2 | 50 | 16 | 36.9 | 40.6 | 50 |
| 2 | 80.8 | 23.9 | 50 | 17 | 35.2 | 42.8 | 50 |
| 3 | 76.3 | 24.5 | 50 | 18 | 33.7 | 45.1 | 50 |
| 4 | 71.9 | 25.3 | 50 | 19 | 32.3 | 47.6 | 50 |
| 5 | 67.8 | 26.0 | 50 | 20 | 31.0 | 50.4 | 50 |
| 6 | 63.8 | 26.9 | 50 | 21 | 29.9 | 53.4 | 50 |
| 7 | 60.1 | 27.8 | 50 | 22 | 28.8 | 56.6 | 50 |
| 8 | 56.6 | 28.8 | 50 | 23 | 27.8 | 60.1 | 50 |
| 9 | 53.4 | 29.9 | 50 | 24 | 26.9 | 63.8 | 50 |
| 10 | 50.4 | 31.0 | 50 | 25 | 26.0 | 67.8 | 50 |
| 11 | 47.6 | 32.3 | 50 | 26 | 25.3 | 71.9 | 50 |
| 12 | 45.1 | 33.7 | 50 | 27 | 24.5 | 76.3 | 50 |
| 13 | 42.8 | 35.2 | 50 | 28 | 23.9 | 80.8 | 50 |
| 14 | 40.6 | 36.9 | 50 | 29 | 23.2 | 85.4 | 50 |
| 15 | 38.7 | 38.7 | 50 |
Like this, the light entrance face (3b) of light-passing board (3) forms even surface whole scope, and on the light-emitting face (3a) of light-passing board (3), form the prism of ad hoc structure as described above, therefore, on zone corresponding to the light-passing board (3) in the zone between 2 adjacent light sources, will all can be to front face side direction (a) outgoing of the normal direction of this light-passing board (3) from the light of 2 adjacent direct incidents of light source.Thereby, even the configurable number of light source (2) is few, also can be with emergent light to frontal with the high brightness outgoing, so, can pass through transmission type image display part (14), the image of exhibit high brilliance on frontal.
Transmission image display device of the present invention also has following such structure.Promptly, in above-mentioned lamp box (5). the rear side of above-mentioned the 2nd light source (22), be provided with will be from the 2nd light source (22) to the light of rear side emission to the 2nd light source (22), or to the reflection face (7) (with reference to Fig. 1,2) of the nearby position reflection of the 2nd light source (22).In the present embodiment, this reflection facial (7) is formed into the zone, summary side of seeing the left side from the front of the 2nd light source (22) and is formed into the zone, summary side (with reference to Fig. 2) of seeing the right side from the front from the rear side of above-mentioned the 2nd light source (22).In other words, in being orthogonal to as the sectional view on the face of the length direction of above-mentioned the 2nd light source (22) of straight tube-like light source, this reflection facial (7) is formed into and can covers with the back side of the 2nd light source (22) is about 210 ° scope at center.The scope of the 2nd light source (22) is smaller a little also to have a big effect even if described reflection facial (7) covers in this sectional view, for example can be made as about 180 °, about 150 °, about 120 °.Above-mentioned reflection face (7) has connection and is positioned at the 2nd curved-surface reflection side (7b) of the 1st curved-surface reflection side (7a) of nearby position of the 2nd light source (22) and the nearby position that the center of curvature (Y2) is positioned at the 2nd light source (22) by the center of curvature (Y1) and the reflecting surface (with reference to Fig. 2,4) of formation.Moreover above-mentioned reflection face (7) also can be to have that the connection center of curvature (Y1) is positioned at the 2nd curved-surface reflection side (7b) in the 1st curved-surface reflection side (7a) in zone (Z) of the 2nd light source (22) and the zone (Z) that the center of curvature (Y2) is positioned at the 2nd light source (22) and the structure of the reflecting surface that constitutes.
Above-mentioned reflection face (7) is in the rear side of above-mentioned the 2nd light source (22), extends and establishes along the length direction (depth direction in Fig. 1) of this light source (22).That is, to cover the state from the rear side of an end of the length direction of above-mentioned the 2nd light source (22) to the rear side of the other end, the reflection face (7) of configuration elongated shape.
In the above-mentioned the 1st and the 3rd～5 light source (21) (23) (24) (25), also, dispose the reflection face (7) (with reference to Fig. 1,2) identical respectively equally with said structure in the rear side of these light sources (21) (23) (24) (25).
In addition, between the adjacent reflection face (7) (7), all be to connect with flat connection reflecting plate (8).In the present embodiment, all surfaces of the front of above-mentioned reflection face (7) (towards the face of light-passing board) is white reflecting surface.In addition, all surfaces of the front of above-mentioned connection reflecting plate (8) (towards the face of light-passing board) constitutes white reflecting surface.In the present invention, by reflecting facial (7) and being connected reflecting plate (8) formation light-reflecting components.
In above-mentioned planar light source device (1), because rear side in light source (2), be provided with will be from this light source (2) to the light of rear side emission to this light source (2) or to the reflection face (7) of the nearby position reflection of this light source (2), as shown in Figure 2, the reverberation (dotted line of band arrow among Fig. 2) that the light of launching to rear side from light source (2) is formed by this reflection facial (7) reflection, be incident to light-passing board (3) with the path that is close with path directly into the direct sunshine that is incident upon light-passing board (3) solid line of arrow (in the Fig. 2 band), therefore, this reverberation also can be to front face side direction (a) outgoing of the normal direction of light-passing board (3).Like this, not only send and directly into the light that is incident upon light-passing board (3) to front face side from light source (2), and from light source (2) to the light of rear side emission also can be via the reflection of reflecting surface (7) to front face side direction (a) outgoing of the normal direction of light-passing board (3), therefore, the brightness of the frontal of planar light source device (1) is improved more.
Moreover, above-mentioned reflection face (7) not only is formed on the rear side zone of light source (2), and the summary side that is formed on the left side from this rear side to this light source (2) is regional and the zone, summary side on right side, from this light source (2) light of sending of the zone, summary side of both sides to the left and right, also by this reflection facial (7) reflection, form light to this light source (2) or position reflection near this light source (2), not only from the light of light source (2) to the rear side emission, and from light source (2) light that sends of the zone, summary side of both sides also can be to front face side direction (a) outgoing of the normal direction of light-passing board (3) to the left and right, therefore, the brightness of frontal is improved.Thereby, according to above-mentioned transmission image display device, can show the image of even high brightness to frontal.
And in the planar light source device that is not provided with above-mentioned reflection face (7) structure, as shown in figure 10, the light from light source (2) sends to the zone, summary side of the rear side and the left and right sides is incident to light-passing board (3) after the reflections such as inner surface by lamp box (5).This light-passing board (3) from adjacent 2 light sources (2) (2) directly into the light that is incident upon portion between light source (for example is designed so that, light by light path shown in the solid line in Figure 10) all to front face side direction (a) outgoing of the normal direction of this light-passing board (3), as shown in figure 10, be difficult to make to unordered direction reflection and be incident to of front face side direction (a) outgoing of the reverberation (representing) of this light-passing board (3) towards the normal direction of this light-passing board (3) with the dotted line of being with arrow.That is, under the situation that is not provided with above-mentioned reflection face (7), reverberation to unordered direction outgoing, is difficult to make reverberation to the frontal outgoing by this light-passing board (3) back.Like this, in the structure that is not provided with above-mentioned reflection face (7), can control from the exit direction of light source (2) directly into the light that is incident upon this light-passing board (3), be reflected but can not control after light source (2) emission, be incident to the catoptrical exit direction of this light-passing board (3) with unordered direction, therefore, can not obtain sufficient brightness at frontal.
In the present invention, as above-mentioned reflecting surface (7), as long as can finish with from light source (2) to the light of rear side emission to this light source (2) or to the nearby position function of reflecting of this light source (2), its shape and structure etc. are not particularly limited.
For example, also can adopt the structure (the 2nd embodiment) of the reflection face (7) that is provided with shown in Fig. 5～7.The identical point of the 2nd embodiment and the 1st embodiment is, the rear side of each light source (2) be provided with from this light source (2) to the light of rear side emission to this light source (2) or to the reflection face (7) of the nearby position reflection of this light source (2), but in the 2nd embodiment, this reflection facial (7) is adopted by the center of curvature (Y) and is positioned at the structure (with reference to Fig. 7) that the nearby single curved-surface reflection side of position of this light source (2) forms.Moreover above-mentioned reflection face (7) also can be to be positioned at the structure that the single curved-surface reflection side in the zone (Z) of this light source (2) forms by the center of curvature (Y).Moreover in Fig. 5～7, the structural portion identical with the 1st embodiment shown in above-mentioned Fig. 1～4 has identical mark, omits its explanation.
Perhaps, also can adopt the structure (the 3rd embodiment) of the reflection face (7) that is provided with as shown in Figure 8.The 3rd embodiment and the above-mentioned the 1st, the identical point of 2 embodiments is, the rear side of each light source (2) be provided with from each light source (2) to the light of rear side emission to this light source (2) or to the reflection face (7) of the nearby position reflection of this light source (2), but in the 3rd embodiment, this reflection facial (7) is by a plurality of plane reflection faces (7c) that are configured to this light source (2) is surrounded ... be formed by connecting, in the cross sectional view on the face of the length direction that is orthogonal to this light source (2), will connect adjacent planar reflecting surface (7c) summit (9) (7c) ... and the disconnected summit (9b) of the plane reflection face (7c) of the disconnected summit (9a) of the plane reflection face (7c) of the leftmost side and the rightmost side all is positioned at the zone (Z) of this light source (2) or the nearby position of this light source (2) in the center (Y3) of the smallest imaginary circle (U) of interior bag.In the 3rd embodiment, with above-mentioned summit (9) (9) (9) (9) (9) (9A) (9B) all in smallest imaginary circles (U) of bag form by (9A) circle of (9B) of these whole summits (9) (9) (9) (9) (9).That is, the interior shape of the reflection of this in the above-mentioned cross sectional view facial (7) is with identical with the shape of half behind dodecagon 2 branches such as grade.Moreover in Fig. 8, the structure division identical with the 1st embodiment has identical mark, omits its explanation.
Perhaps, also can adopt the structure (the 4th embodiment) of the reflection face (7) that is provided with as shown in Figure 9.The identical point of the 4th embodiment and above-mentioned the 3rd embodiment is, first, the rear side of each light source (2) be provided with from this light source (2) to the light of rear side emission to this light source (2) or to the reflection face (7) of the nearby position reflection of this light source (2), second, this reflection facial (7) is by a plurality of plane reflection faces (7c) that will be configured to this light source (2) is surrounded ... connect and constitute, in the cross sectional view on the face of the length direction that is orthogonal to this light source (2), will connect adjacent planar reflecting surface (7c) summit (9) (7c) ... and the disconnected summit (9B) of the plane reflection face (7c) of the disconnected summit (9A) of the plane reflection face (7c) of the leftmost side and the rightmost side all is positioned at the zone (Z) of this light source (2) or the nearby position of this light source (2) in the center (Y4) of the smallest imaginary circle (U) of interior bag.But, in the 4th embodiment, with above-mentioned summit (9) (9) (9) (9A) (9B) all in the imaginary circle (U) of minimums of bag (9A) constitute on a part of summit in (9B) by these whole summits (9) (9) (9), this is the difference of the 4th embodiment and above-mentioned the 3rd embodiment.That is, with above-mentioned summit all in the smallest imaginary circles (U) of bag) summit of the lower position (apart from light-passing board position farthest) by central authorities, but by remaining 4 summit (9) (9) (9A) (9B).Moreover component part identical with above-mentioned the 1st embodiment in Fig. 9 all has identical mark, omits its explanation.
As described in the 1st and the 2nd above-mentioned embodiment, as above-mentioned reflection face (7), the structure that curved-surface reflection side that 1 above center of curvature is positioned at the nearby position of the zone (Z) of this light source (2) or this light source (2) forms is set, and is being desirable aspect the brightness that improves frontal more.
In addition, as described in the 3rd and the 4th above-mentioned embodiment, as above-mentioned reflection face (7), make it surround a plurality of plane reflection faces (7c) of this light source (2) as being configured to, in the cross sectional view on the face of the length direction that is orthogonal to this light source (2), be provided with the summit (9) at the two ends of these plane reflection faces (7c) (9A) (9B) all in the center (Y3) of smallest imaginary circles (U) of bag (Y4) be positioned at the structure that a plurality of plane reflection faces (7c) of the nearby position of the zone (Z) of this light source (2) or this light source (2) form, be desirable aspect the brightness that improves frontal more.
As the scope (zone) of the nearby position of above-mentioned light source (2) (W), be orthogonal to this light source) in the cross sectional view on the face of the length direction of (2), be spaced apart " H " if establish the sowing discord of center of above-mentioned light-passing board (3) and this light source (2), adjacent light source (2) (2) center distance each other is " L ", with the normal direction that is parallel to this light-passing board (3) straight line by the center (G) of this light source (2) as the 1st imaginary line (Q), and with the direction that is parallel to this light-passing board (3) straight line by the center (G) of this light source (2) as the 2nd imaginary line (J), then this scope with the vertical range of the 1st imaginary line (Q) below 0.15L, and with the vertical range of the 2nd imaginary line (J) be below the 0.15H, the scope behind the zone (Z) of existence of this light source (2) of preferably removing is (with reference to Fig. 4,7).If by the structure of position near the light source of such particular range, then the reverberation by above-mentioned reflection face (7) reflection can make the brightness of frontal improve more.
In addition, in the above-described embodiment, the front of above-mentioned reflection face (7) is formed white reflecting surface, but is not particularly limited in such structure, also can form for example mirror reflection surface.
Thickness (S) to above-mentioned light-passing board (3) is not particularly limited, but is set in 0.1～15mm usually, preferred 0.5～10mm, more preferably 1～5mm.
As above-mentioned light-passing board (3), the transparent panel that can use the transparent material by transparent resin, clear glass etc. to constitute usually.As above-mentioned transparent resin, be not particularly limited, for example can be polycarbonate resin, ABS resin (acrylonitrile-butadiene-styrene (ABS) EVA resin), isobutylene resin, MS resin (methyl methacrylate-styrene copolymer resin), polystyrene resin, AS resin (acrylonitrile styrene copolymer resin), polyene resin (for example, polyethylene, polypropylene etc.) etc.
Formation method for above-mentioned prism (triangle) is not particularly limited, and extrusion, pressing, cutting method, injection molding method etc. for example can be arranged.Wherein, based on the consideration of production efficiency, it is desirable to form with extrusion.
Above-mentioned light source (2) also is not particularly limited, and for example can be the straight tube-like lamp of fluorescent tube (cold cathode spool), Halogen lamp LED, tengsten lamp etc., the spot light of light emitting diode (LED) etc. etc.
In addition, center (G) spacing (G) of adjacent light source (2) (2), the consideration based on power saving (L) preferably is set between 15～150mm.The distance (H) of above-mentioned light-passing board (3) and above-mentioned light source (2) based on the consideration of slimming, preferably is set in 5～50mm.
Planar light source device of the present invention (1), transmission image display device comprise: on the rear side of at least 1 the light source (2) in a plurality of light sources that constituted, be provided with from this light source (2) to the light of rear side emission to this light source (2) or to the structure of the reflection face (7) of the nearby position reflection of this light source (2).Certainly, be preferably on the rear side separately (all rear side of light source) of a plurality of light sources that constitute planar light source device (1) or transmission image display device, employing be provided with from this light source (2) to the light of rear side emission to this light source (2) or to the structure of the reflection face (7) of the nearby position reflection of this light source (2), this is self-evident.
In addition, for example, left and right directions among Fig. 2,6 can be designed so that it becomes the left and right directions (horizontal direction) of planar light source device (1) or transmission image display device, perhaps Fig. 2,6 left and right directions can be designed so that it becomes the vertical direction (above-below direction) of planar light source device (1) or transmission image display device, and this is not particularly limited.For example, have at transmission image display device and need wide visual angle at left and right directions (horizontal direction), and on vertical direction (above-below direction), be designed to the situation at narrow visual angle, at this moment, can be designed to (for example) makes Fig. 2,6 left and right directions become the vertical direction (above-below direction) of planar light source device (1) or transmission image display device.
Planar light source device of the present invention (1), transmission image display device are not particularly limited the structure in above-mentioned embodiment, as long as break away from its essence within the scope of the claims and not, allow the change in any design.
Embodiment
Specific embodiments of the invention below are described, but the present invention is not limited to embodiment.
＜embodiment 1 〉
Use the simulation that produces by Ray-tracing Method to calculate to the angular distribution of the brightness of the light of observer's outgoing the light-passing board (3) when formation is provided with the liquid crystal indicator (10) of structure (with reference to Fig. 1～4) of above-mentioned the 1st embodiment.To be illustrated among Figure 11 with solid line by the result that this simulation produces.Every design condition and above-mentioned identical (with reference to table 1).Moreover, adjacent light source (2) (2) interval (L) each other is set at 30mm, distance (H) from light source (2) to light-passing board (3) is set at 19mm, the diameter of section (2r) of straight tube-like light source (2) is set at 2mm, and the 1st curved-surface reflection side (7a) of the reflection face (7) that is made of white reflecting plate and the radius of curvature (R) of the 2nd curved-surface reflection side (7b) are set at 3mm.In addition, light-passing board (3) has the structure that the resin plate by thickness (S) 2mm of the MS resin (transparent resin) of refractive index 1.57 system forms.Moreover the center of curvature (Y1) of the 1st curved-surface reflection side (7a) is positioned at from the center (G) of light source (2) and moves 1mm along the 1st imaginary line (Q) to front direction, again to the drawing left that is parallel to the 2nd imaginary line (J) on the position of mobile 1mm.In addition, the center of curvature (Y2) of the 2nd curved-surface reflection side (7b) is positioned at from the center (G) of light source (2) and moves 1mm along the 1st imaginary line (Q) to front direction, moves on the position of 1mm to the drawing right that is parallel to the 2nd imaginary line (J) again.
Moreover, so-called above-mentioned Ray-tracing Method simulation, be based on the Meng Te-Caro probability simulation of geometric optics, wherein, the reflection characteristic at the shape of each component part of the model of setting formation simulated object, refractive index, interface, the light that takes place for working majority on the probability repeats trace transmission and reflection separately, fully restrains until its result.
＜comparative example 1 〉
To use by the Ray-tracing Method analog computation to the angular distribution of the brightness of the light of observer's outgoing from light-passing board (3) as the situation of the structure that reflection facial (7) are not set the liquid crystal indicator (10) of embodiment 1 (other structure, impose a condition it is identical with embodiment 1 to make) (with reference to Figure 10).The with dashed lines as a result that this simulation produces is shown among Figure 11.Moreover light source (2) is set at 4mm with the distance (h) of the white reflecting plate (5a) of the bottom surface of lamp box.
From the curve of Figure 11 as can be known, in embodiment 1, the front face side direction (a) with the normal direction of light-passing board (3) be the center ± 12 ° scope in, emergent light is by abundant optically focused, can fully improve the brightness of frontal, form contrast with it, in comparative example 1, emergent light only the front face side direction (a) with the normal direction of light-passing board (3) be the center ± 5 ° scope in by abundant optically focused, the brightness of frontal is insufficient.
Figure 12 be that expression provides according to above-mentioned analog result, be that the energy of light of the interior outgoing of any shooting angle scope (+with-the angular range of both sides) at center is with respect to the curve of the ratio (%) of the energy of whole emergent lights with the front face side direction (a) of the normal direction of light-passing board (3).Moreover, the result of embodiment 1 is represented with solid line, the result of comparative example 1 is shown in broken lines.From the curve of this Figure 12 as can be known, in comparative example 1, the front face side direction (a) with the normal direction of light-passing board (3) be the center ± direction in 10 ° the scope on, about 42% outgoing with respect to full emergent light is arranged, and in embodiment 1, the front face side direction (a) with the normal direction of light-passing board (3) be the center ± direction in 10 ° the scope on, about 63% of the full emergent light of outgoing.
Moreover, usually, in devices such as LCD TV, looking the hearer watches in about 3 times position leaving its height from LCD TV and is considered to good, in this case, angle when looking the uppermost position in fig-ure of picture that the hearer watches LCD TV is to watch for about up 10 ° from horizontal direction, angle when watching the upper/lower positions of picture is to watch for about down 10 ° from level, in the evaluation of the curve of Figure 12, to be with the front face side direction (a) of the normal direction of light-passing board (3) center ± light of direction outgoing in 10 ° the scope catches as " light of frontal ", compares evaluation.
The possibility of utilizing on the industry
Planar light source device of the present invention is suitable as backlight that transmission image display device uses, but is not particularly limited in such purposes.
Claims (6)
1. one kind is provided with a plurality of light sources, light-passing board and the facial planar light source device of reflection, wherein:
Described a plurality of light source is configured to leave each other at interval,
In described planar light source device, described light-passing board is configured in the front face side of described light source, and described reflection face is configured in the rear side of described light source,
Described light-passing board is made of portion between straight top of light source and light source, and portion constitutes and makes the normal direction that all can change to described light-passing board from the direction of light of 2 adjacent direct incidents of light source between described light source,
Described reflection is facial have with by described light source to the light of rear side emission towards described light source or its structure of position reflection nearby.
2. planar light source device as claimed in claim 1, wherein:
Described a plurality of light source is a plurality of straight tube-like light sources that are parallel to each other,
Described reflection is facial to be provided with the center of curvature and to be positioned at nearby curved-surface reflection side more than 1 of position of described straight tube-like light source or its, perhaps
The facial a plurality of plane reflection faces that are configured to surround described straight tube-like light source that are provided with of described reflection, in the cross sectional view on the face of the length direction that is orthogonal to described straight tube-like light source, with the summit at these plane reflection face two ends all in bag the smallest imaginary circle be centered close to nearby position of described straight tube-like light source or its.
3. planar light source device as claimed in claim 2, wherein:
In the cross sectional view on the face of the length direction that is orthogonal to described straight tube-like light source, described reflection is facial, and to form covering be roughly 180 ° the scope at center with the back side of described straight tube-like light source, the light that sends to roughly 180 ° the scope that with its back side is the center from described straight tube-like light source reflects by described reflection is facial, to described straight tube-like light source or its nearby position reflection.
4. as claim 2 or 3 described planar light source devices, wherein:
In the cross sectional view on the face of the length direction that is orthogonal to described straight tube-like light source, be spaced apart " H " as if sowing discord between the center of establishing described light-passing board and described straight tube-like light source, adjacent described straight tube-like light source center distance each other is " L ", and with the straight line of the normal direction that is parallel to described light-passing board and the center by described straight tube-like light source as the 1st imaginary line, with the straight line that is parallel to described light-passing board and the center by described straight tube-like light source during as the 2nd imaginary line, the then described straight tube-like light source nearby scope of position is that vertical range with the 1st imaginary line is below 0.15L, with the scope of vertical range below 0.15H of the 2nd imaginary line, wherein remove the zone that described straight tube-like light source exists.
5. as any described planar light source device in the claim 1～4, wherein:
Described reflection face has the structure that will reflect towards the nearby position of described light source from the light that described light source is launched to rear side.
6. transmission image display device, wherein:
Any described planar light source device in the rear side configuration claim 1～5 of transmission type image display part.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007308588A JP2009134922A (en) | 2007-11-29 | 2007-11-29 | Surface light source device |
| JP2007308588 | 2007-11-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101509609A true CN101509609A (en) | 2009-08-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008101771720A Pending CN101509609A (en) | 2007-11-29 | 2008-12-01 | Surface light source device |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2009134922A (en) |
| KR (1) | KR20090056866A (en) |
| CN (1) | CN101509609A (en) |
| TW (1) | TW200930935A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104048238A (en) * | 2013-03-12 | 2014-09-17 | 福特全球技术公司 | Signal assemblies providing uniform illumination through light source location and spacing control |
| CN111308783A (en) * | 2020-03-25 | 2020-06-19 | 深圳市隆利科技股份有限公司 | LED backlight device and display equipment |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102434823B (en) * | 2011-10-17 | 2015-10-28 | 康佳集团股份有限公司 | A kind of liquid crystal display and curved face reflecting type LED backlight module thereof |
-
2007
- 2007-11-29 JP JP2007308588A patent/JP2009134922A/en active Pending
-
2008
- 2008-11-26 TW TW097145718A patent/TW200930935A/en unknown
- 2008-11-27 KR KR1020080118893A patent/KR20090056866A/en not_active Application Discontinuation
- 2008-12-01 CN CNA2008101771720A patent/CN101509609A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104048238A (en) * | 2013-03-12 | 2014-09-17 | 福特全球技术公司 | Signal assemblies providing uniform illumination through light source location and spacing control |
| CN104048238B (en) * | 2013-03-12 | 2018-06-05 | 福特全球技术公司 | The signal lamp assembly of Uniform Illumination is provided by light source position and spacing control |
| CN111308783A (en) * | 2020-03-25 | 2020-06-19 | 深圳市隆利科技股份有限公司 | LED backlight device and display equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| TW200930935A (en) | 2009-07-16 |
| KR20090056866A (en) | 2009-06-03 |
| JP2009134922A (en) | 2009-06-18 |
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