CN101842738B - Light guide panel for LCD back light unit and LCD back light unit thereby - Google Patents
Light guide panel for LCD back light unit and LCD back light unit thereby Download PDFInfo
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- CN101842738B CN101842738B CN2007801013897A CN200780101389A CN101842738B CN 101842738 B CN101842738 B CN 101842738B CN 2007801013897 A CN2007801013897 A CN 2007801013897A CN 200780101389 A CN200780101389 A CN 200780101389A CN 101842738 B CN101842738 B CN 101842738B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces
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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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
- G02B6/0061—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to provide homogeneous light output intensity
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0045—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide
- G02B6/0046—Tapered light guide, e.g. wedge-shaped light guide
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Planar Illumination Modules (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
Disclosed herein is a light guide plate for an LCD back light unit. More specifically, provided is a wedge-type light guide plate for an LCD back light unit, which has a rear surface formed with a plurality of prisms, each having an asymmetric triangular cross-section so as to increase a vertical half viewing angle and improve optical properties. The light guide plate comprises side surfaces on which light is incident, a front surface from which the light is emitted, the front surface connected to the side surfaces, and a rear surface on which the light is reflected wherein the rear surface is formed with a rear-prism part including a plurality of prisms, each having a longitudinal direction perpendicular to a direction of light emitted from a light source and an asymmetric triangular cross-section.
Description
Technical field
The present invention relates to a kind of LGP that is used for the back light unit of liquid crystal indicator.More specifically; The present invention relates to a kind of wedge type LGP that is used for the back light unit of liquid crystal indicator; This wedge type LGP has the back surface that is formed with a plurality of prisms, and each prism has asymmetric triangular cross section, to increase vertical half angle of view and to improve optical characteristics.
Background technology
Usually; Liquid crystal display (hereafter is " LCD ") device is meant through applying the device that electric field comes display digit or image to being arranged on two liquid crystal between the glass substrate, and liquid crystal is processed by the centre material mutually that has between liquid and solid-state in this device.
Because the LCD device is not a selfluminous device, so it must be provided with back light unit as being used for luminous light source.The mode that the optical transmission rate (transmittance) that the demonstration of image produces with back light unit is conditioned in the liquid crystal panel that the liquid crystal quilt is evenly arranged realizes.
According to the position of luminous light source, the LCD back light unit is divided into direct-type backlight unit and the marginal ray formula back light unit of the liquid crystal panel sidepiece that light source is positioned at LCD that light source is located immediately at the liquid crystal panel rear side of LCD.According to the shape of LGP, marginal ray formula back light unit is subdivided into wedge type back light unit and plate back light unit.
Fig. 9 is the view that the structure of the conventional backlight unit of using the wedge type LGP is shown.
LGP 4 is arranged on LCD panel below and is positioned at a side of light source 2, is used for converting the optically focused that light source 2 produces to planar light, thereby this planar light is projected the LCD panel forward.
Reflecting plate 3 is arranged on the rear side of LGP 4, and the light that is used for light source 2 is sent is towards the LCD panel reflection that is arranged on reflecting plate 3 the place aheads.
When light passed through diffusion sheet 5, light caused brightness to decay rapidly in level and vertical direction generation diffusion.About this point, prismatic lens 6 is used to make the light reflection and assembles, thereby enhanced brightness is provided.
Back light unit further comprises as shell and can be fixed with each parts that allow back light unit so that framed (housing) that back light unit can be integrated, and the lampshade (bonnet) of protection back light unit in the intensity that keeps back light unit and when supporting back light unit.
As shown in Figure 9, light source 2 is usually located at an edge (for LCD TV, light source usually is located immediately at the rear side of panel) of back light unit.Therefore, light also anisotropically sees through the whole surface of unit, makes that the edge of back light unit maybe be all brighter than any other part of back light unit.Use LGP 4 for anti-phenomenon here.LGP is processed by transparent acrylic resin usually, and transparent acrylic resin is because its intensity is higher thereby be difficult for breaking, and has deformation resistance, lighter weight and higher transmission of visible light.
In other words, LGP 4 is used to make the light that sends from light source 2 can be projected the whole surface of LGP 4 equably.Yet, in fact, being decomposed and allowing under the situation that light sends from the light source 2 that is positioned at LGP 4 one sides at back light unit, light is not the whole surface that is projected LGP 4 equably, but concentrates on the two ends of LGP 4.This is because LGP 4 is directed to light the opposite side of LGP 4 from light source 2.
Therefore, the back surface of LGP 4 is applied in particular procedure, so that light produces diffuse reflection in LGP 4, thereby makes light can see through the whole surface of LGP 4.Particularly, the back surface of LGP 4 is formed with protrusion/recess patterns, and this pattern has the distance of considering apart from light source 2 and waits the reservation shape that designs.When this protrusion/recess patterns was formed on the back surface of LGP 4, having more, high brightness and inhomogeneity planar light sent through the whole surface of the light guiding panel of LCD device.
Yet; In the traditional LC D device of as above constructing; The part that the below of panel is formed with protrusion/recess patterns seems brighter; And the below of panel does not have the remainder of protrusion/recess patterns and seems darker, causes on panel, producing optically focused phenomenon (spot phenomenon), thereby has reduced the visibility of LCD device.Particularly, when the LCD panel size increases, lack the absolute magnitude (absolute amount of light) of the light that arrives this place fully, therefore seem darker with the light source 2 longer-distance zone that is separated by.
In addition, diffusion sheet and prismatic lens are used to improve uniformity of light, and cause the back light unit manufacturing cost to increase.
In order to overcome the above problems, need the research of more much amounts, on the whole surface at the LCD panel under the situation of not using diffusion sheet or prismatic lens, to obtain to have the planar light of outstanding visibility, higher brightness and excellent homogeneity.
Summary of the invention
Technical matters
The present invention produces for the problems referred to above that solve prior art, and one aspect of the present invention is to provide a kind of LGP of the LCD of being used for back light unit, and this LGP shows good brightness, uniformity of light and visibility on the whole surface of LCD panel.
Another aspect of the present invention is to provide a kind of LCD back light unit that uses above-mentioned LGP.
It should be noted that the present invention is not limited to above-mentioned aspect, other purposes of the present invention and the following explanation of feature will be conspicuous to those skilled in the art.
Technical scheme
According to an aspect that is used to realize above-mentioned aspect of the present invention, a kind of LGP that is used for liquid crystal indicator is provided, comprising: light incides the side surface on it; Send the front surface of said light, this front surface links to each other with said side surface; And the back surface reflected above that of said light, surface, wherein said back is formed with the rear prism part that comprises a plurality of prisms, and each prism has the vertical and asymmetric triangular-section vertical with the direction of light of sending from light source.
Beneficial effect
The amount of light on whole surface that the LGP that is used for liquid crystal indicator according to the present invention can realize arriving the panel of liquid crystal indicator evenly increases, and vertical half angle of view increases and also improves brightness.The traditional LGP that is provided with prism with the front surface of LGP is compared, and obviously improves according to the brightness and the visibility of LGP of the present invention.
Therefore, according to the present invention,, thereby can reduce the manufacturing cost of back light unit because back light unit can realize not having under the situation that diffusion sheet and prismatic lens one or both of all do not have.
Description of drawings
Through following detailed description and combine accompanying drawing will more be expressly understood above and other aspects, characteristic and other advantages of the present invention, said accompanying drawing comprises:
Fig. 1 and 2 is the skeleton view that illustrates when observing from different perspectives according to the LGP that is used for the LCD back light unit of first embodiment of the invention;
Fig. 3 is the cut-open view along the A-A line intercepting among Fig. 2;
Fig. 4 is the cut-open view along the B-B line intercepting among Fig. 2;
Fig. 5 is the skeleton view of diagram according to the front lens of one tested example of the present invention;
Fig. 6 is the chart of expression according to the brightness of the front lens of one tested example of the present invention and comparative example;
Fig. 7 is the chart of expression according to the rear prism of one tested example of the present invention and comparative example;
Fig. 8 is the chart of expression according to the brightness of the rear prism of one tested example of the present invention and comparative example; With
Fig. 9 is the cut-open view that illustrates the structure of the back light unit that uses traditional wedge type LGP.
Embodiment
The present invention is devoted to a kind of LGP that is used for liquid crystal indicator, and it comprises: light incides the side surface on it; Send the front surface of light, this front surface links to each other with said side surface; And the back surface reflected above that of light, wherein, surface, said back is formed with the rear prism part that comprises a plurality of prisms, and each prism has the vertical and asymmetric triangular-section vertical with the direction of light of sending from light source.
Below with reference to accompanying drawings the present invention is explained in more detail.
Fig. 1 and 2 is the skeleton view that illustrates when observing from different perspectives according to the LGP that is used for the LCD back light unit of first embodiment of the invention.
The first embodiment of the present invention is devoted to a kind of wedge type LGP, and wherein, light source L is positioned at the one of which side.This LGP is processed by the transparent acrylic resin with high strength, anti-fracture and deformability, lighter weight and higher transmission of visible light usually.
Referring to Fig. 1, LGP comprises main body 100, and this main body 100 comprises: light incides the side surface 102 on it; Send the front surface 104 of light, wherein this front surface 104 links to each other with side surface 102 and simultaneously in the face of the panel (not shown) of LCD device; And light reflect above that back surperficial 106, this surface 106, back is in the face of front surface 104.
Be different from the definition in the dictionary, side surface 102 is restricted to light and incides the surface on it.Therefore, in Fig. 1, side surface 102 refers to two surfaces of contiguous light source L.
Referring to Fig. 2, rear prism part 120 makes the brightness of front surface 104 of LGP even.As shown in Figure 2, be positioned at light source L under the situation of wedge type LGP of a side, the width w of rear prism part 120 along with light incide the side surface 102 on it distance increase and increase.Width w cause of increased is following.Along with the distance that incides side surface 102 on it with light increases, the quantitative change of light that arrives this place is little.About this point; Because be used to make the prism 120 of light reflection and refraction to have bigger length; So although a spot of light arrives prism 120, increased by the amount of the light of prism 120 reflections or refraction, therefore can improve the uniformity of light of sending towards front surface 104.
As shown in Figure 2, rear prism part 120 can have candy strip, and wherein width is along with changing with the distance of light source.Alternately, rear prism part 120 can have stipple pattern (dot pattern).
The tradition LGP has the smooth surface of not being with any optical component, or has the prism of triangular-section.
Yet in traditional LGP, when from its front surface observation, the back lip-deep rear prism that is formed on LGP partly exposes, thereby causes the reduction and the Moire effect of visibility unfriendly owing to the interference fringe between two surfaces of prism.
On the other hand, according to LGP of the present invention, the front lens part 140 that is made up of the optical component with half elliptic cross section 142 is set on the front surface 104 of LGP, thereby covers rear prism part 120, improves visibility and optical characteristics thus.
Fig. 3 is the cut-open view along the A-A line intercepting among Fig. 2.Fig. 4 is the cut-open view along the B-B line intercepting among Fig. 2.
As represent shown in Figure 3 along perpendicular to the cross section of the LGP of vertical intercepting of light source, optical component 142 is on the front surface that vertically is formed on LGP in the cross section of LGP.Owing to be lens pillar (lenticular lens) at this optical component that uses 142, then the cross section of vertical and each optical component of each lens pillar is vertically identical.In other words, lens pillar is vertically parallel with direction of light.
Referring to being arranged on the lip-deep prism 122 in back, the parallel longitudinal of the vertical and light source L of each prism with asymmetric triangular-section.
Hereinafter, among the interior angle of asymmetric prism 122, be called as " first interior angle (α) " near the interior angle of light source, and the interior angle relative with light source is called as " second interior angle (β) ".
First interior angle (α) is in 70 ° to 90 ° scope, and second interior angle (β) is in 40 ° to 50 ° scope.Because all interior angle sums of triangle are 180 °, so middle interior angle (θ) is in 40 ° to 70 ° scope.The shape of prism is limited the scope of interior angle, so half angle of view increases.The improvement of half angle of view will illustrate with reference to concrete example in the lower part.
As represent cross section shown in Figure 4 of LGP and parallel longitudinal light source, the optical component 142 that is arranged on the front surface of LGP has elliptic cross-section, and prism 122 is separated from each other on the back surface of LGP.
The length of prism 122 is along with the increase of the distance of light source and increase.
Hereinafter, use according to the preferred embodiment of the invention that LGP causes the fact such as the improvement of characteristics such as brightness, uniformity of light and visibility, will set forth with reference to following concrete example.Although not mentioned, it will be appreciated by those skilled in the art that the more details of example at this.
Advantage of the present invention and effect will be able to confirm through following example:
Example
1. the one tested example of preceding optical component and comparative example
Fig. 5 illustrates the cut-open view that is formed on according to the concrete size of each optical component of the lens pillar form on the front surface of the LGP of the back light unit of the LCD of being used for device of the present invention.
Angle between the height H of each lens pillar, spacing P and adjacent two lens is different, but has the radius-of-curvature of 25 consistent μ m.
Height H and spacing P measure under 0 °, 20 °, 40 °, 60 °, 80 °, 100 °, 120 ° and 140 ° of different angles.
< one tested example 1 >
Rear prism part [width W * length L * thickness T=288.8 * 217.7 * 2.4 (beginning) * 0.8 (end) mm] is with prism (height: 14.25 μ m; Spacing: 25 μ m; And interior angle: 82.5 °) candy strip (spacing: 430 μ m) be formed on the back surface of wedge type LGP.In addition, lens pillar is arranged on perpendicular to light source on the front surface of LGP, and each lens pillar has radius of curvature R and is 25 μ m, highly is that 25 μ m, spacing are 50 μ m, and the angle between the adjacent lens is 0 ° a elliptic cross-section.
< one tested example 2-8 >
Angle between the adjacent lens pillar of one tested example 2-8 on the front surface that is formed on LGP with 20 ° difference from 20 ° to 140 ° the change; Implementing with one tested example 1 identical mode, the height of lens pillar and spacing are confirmed by this angle.The concrete size of the lens pillar among the one tested example 1-8 is summarised among table 1 and Fig. 5.
Table 1
| One tested example 1 | One tested example 2 | One tested example 3 | One tested example 4 | One tested example 5 | One tested example 6 | One tested example 7 | One tested example 8 | |
| Radius-of-curvature | ?25.0μm | 25.0μm | 25.0μm | 25.0μm | 25.0μm | 25.0μm | 25.0μm | 25.0μm |
| Lens height | ?25.0μm | 20.7μm | 16.5μm | 12.5μm | 8.9μm | 5.9μm | 3.4μm | 1.5μm |
| Lenticular spacing | ?50.0μm | 49.2μm | 47.0μm | 43.3μm | 38.3μm | 32.1μm | 25.0μm | 17.1μm |
| Angle | ?0° | 20° | 40° | 60° | 80° | 100° | 120° | 140° |
< comparative example 1 >
Rear prism part [width W * length L * thickness T=288.8 * 217.7 * 2.4 (beginning) * 0.8 (end) mm] is with prism (height: 14.25 μ m; Spacing: 25 μ m; And interior angle: 82.5 °) candy strip (spacing: 430 μ m) be formed on the back surface of wedge shape LGP.
This wedge type LGP is provided with smooth front surface.
< comparative example 2 >
Rear prism part [width W * length L * thickness T=288.8 * 217.7 * 2.4 (beginning) * 0.8 (end) mm] is with prism (height: 14.25 μ m; Spacing: 25 μ m; And interior angle: 82.5 °) candy strip (spacing: 430 μ m) be formed on the back surface of wedge type LGP.
In addition, prism is arranged on perpendicular to light source on the front surface of LGP, and each prism has spacing and is 50 μ m, highly is 25 μ m, and the angle between the adjacent lens is 90 ° cross section.
2. the interpretation of result of preceding optical component
Table 2
| Comparative example 1 | Comparative example 2 | One tested example 1 | One tested example 2 | One tested example 3 | One tested example 4 | One tested example 5 | One tested example 6 | One tested example 7 | One tested example 8 | |
| Top structure | X | Prism | Lens pillar | Lens pillar | Lens pillar | Lens pillar | Lens pillar | Lens pillar | Lens pillar | Lens pillar |
| Vertical luminance (cd) | 224.5 | 234.93 | 215.6 | 199.9 | 216.4 | 225.4 | 241.5 | 247.1 | 256.3 | 256.7 |
| Pattern visibility | 1 | 1 | 4 | 4 | 4 | 3 | 3 | 3 | 2 | 2 |
| Lens height/lenticular spacing | - | - | 0.5 | 0.42 | 0.35 | 0.29 | 0.23 | 0.18 | 0.16 | 0.09 |
Pattern visibility rank: outstanding (5)＞fine (4)＞good (3)＞still can (2)＞poor (1)
The result of table 2 expression one tested example 1 to 8 and comparative example 1 and 2.Fig. 6 is the chart of expression according to the brightness of one tested example of the present invention and comparative example.
Can know by table 2 and Fig. 6, demonstrate higher central brightness less than the one tested example under 0.23 the condition, and compare all one tested example with comparative example and all show outstanding pattern visibility at the ratio of lens height and lenticular spacing.Also can confirm, when the pattern visibility between comparison test property example and the comparative example and brightness the two the time, one tested example 5 and 6 the bests.
These results confirm; Preferred arrangements is in the scope of ratio at 1: 0.1 to 1: 0.35 of the spacing of each optical component on the front surface of LGP and height; Angle between the adjacent optical member is in 60 ° to 120 ° scope, and the radius-of-curvature of each optical component is in 0.58 to 1.0 times scope of the spacing of each lens.
3. the one tested example and the comparative example of rear prism part
< one tested example 9 >
Rear prism part [width W * length L * thickness T=288.8 * 217.7 * 2.4 (beginning) * 0.8 (end) mm] is with prism (height: 25 μ m; Spacing: 25 μ m; First interior angle (α): 90 °; Interior angle (θ): 45 °; And (the spacing: 430 μ m) be formed on the back surface of wedge type LGP of candy strip second interior angle (β): 45 °).In addition, this photoconduction tabula rasa is provided with catoptron (mirror) front surface.
< one tested example 10 to 13 >
One tested example 10 to 13 is reduced to 70 ° except first interior angle (α) with 5 ° difference, and intermediate angle (θ) increases to 45 ° with 5 ° difference, and second interior angle (β) remains outside 45 °, to implement with one tested example 9 identical modes.
The concrete size of the prism in the one tested example 9 to 13 is summarised among table 3 and Fig. 7.
Table 3
| One tested example 9 | One tested example 10 | One tested example 11 | One tested example 12 | One tested example 13 | |
| First interior angle (α) | 90° | 85° | 80° | 75° | 70° |
| Intermediate angle (θ) | 45° | 45° | 45° | 45° | 45° |
| Second interior angle (β) | 45° | 50° | 55° | 60° | 65° |
| Prism height | 25.0μm | 23.0μm | 21.2μm | 19.7μm | 18.3μm |
< comparative example 3 >
Rear prism part [width W * length L * thickness T=288.8 * 217.7 * 2.4 (beginning) * 0.8 (end) mm] is with rear prism (height: 14.25 μ m; Spacing: 25 μ m; Interior angle: 82.5 °) candy strip (spacing: 430 μ m) be formed on the back surface of wedge type LGP.In addition, this LGP is provided with catoptron (mirrored) front surface.
4. the interpretation of result of the surperficial prism in back
Table 4
| Comparative example 3 | One tested example 9 | One tested example 10 | One tested example 11 | One tested example 12 | One tested example 13 | |
| Vertical luminance (cd) | 217.6 | 217.5 | 272.2 | 256.5 | 230.0 | 211.3 |
| Vertical half angle of view | -9°/+7° | -10°/+12° | -10°/+12° | -10°/+12° | -10°/+15° | -10°/+17° |
| First interior angle (α) | 48.75° | 90° | 85° | 80° | 75° | 70° |
| Intermediate angle (θ) | 82.5° | 45° | 50° | 55° | 60° | 65° |
| Second interior angle (β) | 48.75° | 45° | 45° | 45° | 45° | 45° |
The result of table 4 expression one tested example 9 to 13 and comparative example 3.Fig. 8 is the chart of expression according to the brightness of the back surperficial prism of one tested example and comparative example.
Can know according to table 4 and Fig. 8, show good central brightness less than the one tested example under 70 ° the condition, and compare all one tested example with comparative example 3 and all have higher vertical half angle of view at first interior angle.Also can confirm, when brightness between comparison test property example and the comparative example and vertical half angle of view the two the time, one tested example 11 and 12 the bests.
Be clear that through above-mentioned explanation; Utilization is according to the LGP of one tested example of the present invention; Under the situation of the prismatic lens that liquid crystal indicator of the present invention uses in the back light unit that is not employed in traditional liquid crystal indicator, can obtain and the essentially identical effect of traditional liquid crystal indicator.That is to say, use LGP according to the present invention to eliminate necessity of one or two prismatic lens in multiple that is applied to conventional backlight unit.
Claims (9)
1. LGP that is used for liquid crystal indicator comprises:
Light incides the side surface on it;
Send the front surface of said light, said front surface links to each other with said side surface; And
The back surface that said light reflects above that,
Surface, wherein said back is formed with the rear prism part that comprises a plurality of prisms, and each prism has the vertical and asymmetric triangular-section vertical with the direction of light of sending from light source,
Wherein said prism has near said light source and first interior angle in 70 ° to 90 ° scopes, and said prism has second interior angles relative with said light source and in 40 ° to 50 ° scopes,
Said front surface is formed with the front lens part that comprises a plurality of optical components, and each optical component has elliptic cross-section,
The said elliptic cross-section of each said optical component has spacing and the aspect ratio in 1: 0.1 to 1: 0.29 scope.
2. LGP according to claim 1, wherein said front lens part vertically with each prism vertically between the angle of qualification in 80 ° to 100 ° scope.
3. LGP according to claim 1, wherein the elliptic cross-section of each said optical component has spacing and the aspect ratio in 1: 0.16 to 1: 0.29 scope.
4. LGP according to claim 1, the angle between wherein adjacent two optical components is in 60 ° to 120 ° scope.
5. LGP according to claim 1, wherein the radius-of-curvature of each said optical component is in 0.58 to 1.0 times scope of the spacing of this optical component.
6. LGP according to claim 1, wherein said rear prism partly are the form of candy strip, the width of this candy strip along with light incide the said side surface on it distance increase and increase.
7. LGP according to claim 1, wherein said rear prism partly are the form of stipple pattern, the density of this stipple pattern along with light incide the said side surface on it distance increase and increase.
8. back light unit that is used for liquid crystal indicator comprises:
LGP according to claim 1; And
Be arranged in the light source of said LGP one or both sides.
9. liquid crystal indicator comprises:
LGP according to claim 1; And
Be arranged in the light source of said LGP one side.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2007-0109793 | 2007-10-30 | ||
| KR1020070109793A KR100932304B1 (en) | 2007-10-30 | 2007-10-30 | Light guide plate for backlight unit having an asymmetric prism on the back and liquid crystal display using the same |
| PCT/KR2007/005976 WO2009057844A1 (en) | 2007-10-30 | 2007-11-26 | Light guide panel for lcd back light unit and lcd back light unit thereby |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101842738A CN101842738A (en) | 2010-09-22 |
| CN101842738B true CN101842738B (en) | 2012-06-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007801013897A Expired - Fee Related CN101842738B (en) | 2007-10-30 | 2007-11-26 | Light guide panel for LCD back light unit and LCD back light unit thereby |
Country Status (4)
| Country | Link |
|---|---|
| KR (1) | KR100932304B1 (en) |
| CN (1) | CN101842738B (en) |
| TW (1) | TWI367354B (en) |
| WO (1) | WO2009057844A1 (en) |
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- 2007-11-26 TW TW096145056A patent/TWI367354B/en not_active IP Right Cessation
- 2007-11-26 CN CN2007801013897A patent/CN101842738B/en not_active Expired - Fee Related
- 2007-11-26 WO PCT/KR2007/005976 patent/WO2009057844A1/en active Application Filing
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2009057844A1 (en) | 2009-05-07 |
| TWI367354B (en) | 2012-07-01 |
| CN101842738A (en) | 2010-09-22 |
| TW200918973A (en) | 2009-05-01 |
| KR20090043959A (en) | 2009-05-07 |
| KR100932304B1 (en) | 2009-12-16 |
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