CN101038392A - Light guide panel for LCD and back light unit using the same - Google Patents
Light guide panel for LCD and back light unit using the same Download PDFInfo
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- CN101038392A CN101038392A CNA2006101564064A CN200610156406A CN101038392A CN 101038392 A CN101038392 A CN 101038392A CN A2006101564064 A CNA2006101564064 A CN A2006101564064A CN 200610156406 A CN200610156406 A CN 200610156406A CN 101038392 A CN101038392 A CN 101038392A
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- guide plate
- light
- light guide
- prism
- stripe prisms
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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
- 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
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/0031—Reflecting element, sheet or layer
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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
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
- Light Guides In General And Applications Therefor (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
Abstract
Disclosed herein is a light guide plate for a backlight unit of a liquid crystal display device, which has excellent brightness, uniformity and visibility of light. The light guide plate comprises side surfaces on which light is incident, a front surface from which the light is emitted, and a rear surface on which the light is reflected, wherein the front surface is formed with front-prisms, each having a predetermined cross-section, and the rear surface is formed with stripe-prisms, each increasing in width along with an increase in distance between the stripe- prism and the side surfaces on which the light is incident.
Description
Technical field
The present invention relates to a kind of light guide plate that is used for the backlight liquid crystal display unit, it comprises strip pattern (stripe pattern), more specifically, the present invention relates to a kind of back light unit that is used for the light guide plate of LCD and comprises described light guide plate, wherein be formed with stripe prisms on the rear surface of light guide plate, improve visual effect and brightness widely.
Background technology
Generally speaking, LCD (liquid crystal display device, LCD) refer to a kind of by electric field being put on the device that two liquid crystal between glass substrate come display digit or image.Wherein liquid crystal is made by the material with the middle phase (intermediate phase) between solid and liquid.
Because LCD is not the device with emissive ability, therefore need provide back light unit to produce light as light source, and by adjusting the transmittance amount that back light unit produced, display image on display panels.
Fig. 1 illustrates the decomposition diagram of the back light unit of conventional liquid crystal.
According to the position of source emissioning light, back light unit can classify as direct type back light unit (directtype backlight unit) and peripheral type back light unit (edge type backlight unit).The light source of direct type back light unit is located immediately at the rear side of the liquid crystal panel 100 of LCD.The light source of peripheral type back light unit is positioned at a side of panel 100.Peripheral type back light unit 10 as shown in Figure 1.
See also Fig. 1, the back light unit of conventional liquid crystal (LCD) comprises light source 105, light guide plate 110, reflecting plate 115, diffusion sheet 120, prismatic lens (prism sheet) 125 and screening glass 130.
Diffusion sheet 120 is positioned at the front side of light guide plate 110, and is the light unanimity that makes by light guide plate 110.
When light passed through diffusion sheet 120, light can make brightness deterioration apace in horizontal direction and vertical spread.In the case, use prismatic lens 125 to reflect and focused light, thereby enhanced brightness is provided.
Screening glass 130 is positioned at the top of prismatic lens 125, and is used for preventing producing scratch on the prismatic lens 125, and is used for avoiding taking place Moire effect (Moire effect) when using prismatic lens 125 on horizontal direction and vertical direction.
Though among Fig. 1 and not shown, back light unit 10 also comprises framed (mold frame) and lampshade.Framedly be used for protecting each assembly.Lampshade is used for protecting back light unit 10, and is used for keeping the intensity of back light unit 10 and supports back light unit 10.
Fig. 2 and Fig. 3 illustrate the amplification sectional view in the path of light in light guide plate 110 of light source 105 generations.
See also Fig. 2, light source 105 generally is positioned at an edge (light source of LCD TV is located immediately at the rear side of panel usually) of back light unit 10.Therefore, light is the whole surface of transmission by the unit evenly, so that the edge of back light unit 10 is brighter than the other parts of back light unit 10.110 of light guide plate are used for fear of this phenomenon.Light guide plate is general made with transparent acryl resin (acrylic resin).Acryl resin is because of tool high strength cracky not, and has characteristic not yielding, in light weight and that visible light transmittance is high.
In other words, light guide plate 110 is used for making the light of light source 105 emissions to be projected to the whole surface of light guide plate 110 equably.Yet in fact and anisotropically light be projected to the whole surface of light guide plate 110, but concentrate on the two ends of light guide plate 110.This is because light guide plate 110 will cause the two ends of light guide plate 110 from the photoconduction of light source 105.
Therefore, as shown in Figure 3, handle through special the rear surface of light guide plate 110 so that light produces scattering in light guide plate 110, like this light evenly transmission pass through the whole surface of light guide plate 110.Particularly, the rear surface of light guide plate 110 has coarse patterns (roughnesspattern) 113, and this coarse patterns 113 has the reservation shape that designs under situation about considering with the distance of light source 105 etc.When coarse patterns 113 was formed on the rear surface of light guide plate 110, the face light with higher brightness and uniformity coefficient was transmitted to the whole surface of the light guide plate of LCD.
Yet, in the above-mentioned conventional liquid crystal that constitutes, the part that the below of panel has coarse patterns 113 seems bright, do not have a part of coarse patterns 113 and then seem dark in the below of other panel, like this, produce spot phenomenon (spot phenomenon) on the panel, make the visibility of LCD reduce.Particularly when the size of display panels increases, can fewly because of the light quantity that arrives it seem darker apart from light source 105 zones far away.
In addition, diffusion sheet 120 and prismatic lens 125 are used for improving the light uniformity coefficient, but the manufacturing cost of back light unit 10 is increased.
In order to address the above problem, people are just studying the back light unit that provides such: this back light unit can provide the light of the face with high brightness and uniformity coefficient, and under the situation of not using diffusion sheet 120 or prismatic lens 125, can guarantee superior visibility.
Summary of the invention
In view of the above problems, one object of the present invention is to provide a kind of light guide plate that is used for the backlight liquid crystal display unit, and this light guide plate comprises stripe prisms.
Provide a kind of backlight liquid crystal display unit that is used for according to another object of the present invention is to, this back light unit comprises according to light guide plate of the present invention.
It should be noted that the present invention is not limited to above-mentioned purpose, and according to hereinafter describing in detail, other purpose of the present invention and characteristic will be tangible for those skilled in the art.
According to an aspect of the present invention, above-mentioned and other purpose can realize by the light guide plate that is provided for LCD.Described light guide plate comprises that a plurality of side surfaces of light incident on it, light are from rear surface that the front surface and the light of its emission reflects thereon.Wherein, front surface is formed with preceding prism, and each has predetermined cross section preceding prism.The rear surface is formed with stripe prisms, and the width of each stripe prisms is along with the distance of stripe prisms and the light incident side surface on it increases and increases.
According to a further aspect in the invention, provide and be used for the backlight liquid crystal display unit.Described back light unit comprises light source and light guide plate of the present invention.
Otherwise details is included in the detailed description and the accompanying drawings.
Description of drawings
Fig. 1 illustrates the decomposition diagram of the back light unit of conventional liquid crystal;
Fig. 2 and Fig. 3 illustrate light source and produce the light amplification sectional view in the path of described light in light guide plate afterwards;
Fig. 4 illustrates the skeleton view of the light guide plate that is used for the backlight liquid crystal display unit according to an embodiment of the invention;
Fig. 5 to Fig. 7 illustrates the skeleton view in the preceding prism cross section of a plurality of embodiment;
Fig. 8 illustrates the amplification sectional view of the stripe prisms on the rear surface of light guide plate;
The rear surface that Fig. 9 and Figure 10 illustrate light guide plate is provided with the simple and easy planimetric map of a plurality of stripe prisms;
Figure 11 illustrates the planimetric map of the rear surface of the light guide plate that additionally is provided with a plurality of somes prisms on it;
Figure 12 and Figure 13 illustrate its stripe prisms that is provided with a plurality of corrections and produce the planimetric map of rear surface of the light guide plate of dark portion to avoid brightness ground connection because of the edge of rear surface; And
Figure 14 illustrates the comparison diagram according to the brightness of the light guide plate of stripe prisms type of the present invention and traditional some prism type light guide plate.
Embodiment
To engage accompanying drawing and describe embodiments of the invention.Should be noted that to the invention is not restricted to embodiments of the invention, and can carry out various modifications and variations in the case without departing from the scope of the present invention.Provide embodiment be for the time those skilled in the relevant art be expressly understood the present invention, rather than in order to limit the scope of the invention.Scope of the present invention is only limited by described claim.Identical parts are represented with identical reference marker.
For clear description the present invention, the size that the present invention forms assembly is exaggerative size in accompanying drawing.In the following description, suppose one group and be expressed as " in another assembly of position " or " being connected ", represent that then this assembly can contact with other assemblies or has predetermined distance with other assemblies with another assembly.When assembly system and other assemblies under the situation of preset distance, it should be noted that the description that can omit with being used for this assembly is fixed or is coupled to the 3rd assembly of other assemblies.
Fig. 4 illustrates the skeleton view of the light guide plate that is used for the backlight liquid crystal display unit according to an embodiment of the invention.
See also Fig. 4, the light guide plate 30 that is used for the backlight liquid crystal display unit according to one embodiment of the invention is generally made with transparent acryl resin.Acryl resin has the high characteristic of perspective rate of high strength, not yielding, in light weight and visible light.
Preceding prism 310 can be formed on the whole surface of front surface 303, and replacedly, can utilize the plane, interval that is arranged at 310 on preceding prism, prism 310 each interval preset distances before making.As shown in Figure 4, the stripe prisms 320 mutual vertical settings on preceding prism 310 and the light guide plate rear surface 305.Yet, it should be noted that the present invention is not limited thereto vertical structure.Therefore, the angle between preceding prism and stripe prisms is changeable.
In Fig. 4, though each of preceding prism 310 has leg-of-mutton cross section in the longitudinal direction, right the present invention is not limited thereto structure, and preceding prism 310 can have various cross sections.
Fig. 5 to Fig. 7 illustrates the skeleton view in cross section of the preceding prism 310 of a plurality of embodiment.
As shown in Figure 5, can utilize the plane, interval that is arranged at 310 on preceding prism, prism 310 each interval preset distances before making.
Prism 310 each interval predetermined distance d before making and before not being provided with thick and fast the reason of prism 310 be uniformity coefficient and the visibility that strengthens light.
In other words, make its each interval predetermined distance d by prism 310 before being provided with, can make light not refract to the panel of LCD with multi-angle, and make light as far as possible vertical refraction to the panel (not shown), thereby improve to arrive the uniformity coefficient of the light of panel of LCD (not shown).
As shown in Figure 6, prism 310 can have trapezoidal cross section in the longitudinal direction before each.Or as shown in Figure 7, the cross section that prism 310 can have down channel shaped in the longitudinal direction before each, wherein each side surface in the cross section of channel shaped has predetermined curvature.
As shown in Figure 6, prism 310 has under the situation in trapezoidal cross section in the longitudinal direction before each, can adjust light guide plate main body 300 by plane A, so that light can be vertical with the panel (not shown) of LCD as the upper surface of each trapezoidal preceding prism 310.
In addition, as shown in Figure 7, prism 310 has down under the situation of side surface tool curvature in the cross section of channel shaped and the cross section of falling the channel shaped in the longitudinal direction before each, and the curvature range of its side surface is preferably 0.01～1.0mm.
Before the scope of the total area and the ratio of the total area on plane, interval of prism 310 be preferably 1: 0.5～1: 10, plane, described interval is on the front surface 303 of main body 300, between the preceding prism 310.
In addition, among Fig. 4 to Fig. 7, the height h2 of prism 310 is preferably 0.3～0.6 with the scope of width w2 ratio before each: 1.Under the situation of this scope, can keep the proper level visual angle and avoid the reduction of brightness.
Before each of prism 310 have 90 ° or greater than 90 ° interior angle (interior angle), and this interior angle is preferably 90 °～120 °.This angle can make the zone line of panel keep appropriate brightness under the situation of this scope, and keeps the proper level visual angle.
Please consult Fig. 4 once more, the rear surface 305 of main body 300 is formed with bar, described the predetermined distance of mode each interval of the limit with edge joint.Described refers to stripe prisms 320.
Fig. 8 is the amplification sectional view of each stripe prisms 320 among Fig. 4.Stripe prisms 320 can be utilized the mode of outstanding rag (embossed carving) or recessed lines (depressed engraving) and be formed on the rear surface 305 of light guide plate 30.
Each of stripe prisms 320 comprises rear prism 322, and rear prism 322 is formed on the surface of stripe prisms 320.Preferably, form rear prism 322 by this way, make the length direction of each rear prism 322 vertical from the transmit direction (direction Q) of light source with light.Reason is, when the length direction of formed each rear prism 322 and light are vertical from the transmit direction (direction Q) of light source, can carry out diffraction of light, refraction and scattering effectively.
In addition, as mentioned above, since such homeotropic alignment have make light can be via the whole surface of light guide plate the even advantage of refraction and diffusion, therefore be formed in the stripe prisms 320 rear prism 322 preferably with the vertical setting of length direction (direction Q) of preceding prism 310.
As shown in Figure 8, when each rear prism 322 on being formed at stripe prisms 320 had the triangular-section in the longitudinal direction, it was 60 °～100 ° vertex angle theta 1 that described triangular-section preferably has scope.
When vertex angle theta 1 was in this scope, most of light that is sent was vertically directed into the front surface of light guide plate, to increase the brightness of panel zone line.
In addition, preferably, the width that each stripe prisms 320 has is 1: 1 with the scope of length ratio, 000～1: 50,000, and the scope of the height h1 that has of each rear prism 322 and width w1 ratio is 0.3～0.9: 1.The angular range that is limited between the length direction of the length direction of stripe prisms 320 and preceding prism 310 is 30 °～90 °.
Being formed at the stripe prisms 320 on the rear surface of light guide plate and being formed at stripe prisms 320 lip-deep rear prisms 322 will be in set forth in detail hereinafter.
The main body 300 of light guide plate has a plurality of stripe prisms 320, and stripe prisms 320 is formed on the rear surface 305, makes each stripe prisms 320 width when its any side surface 301 from light incident is far away more increase.Particularly, when light was incident on the opposite side surfaces 301, the centre of each stripe prisms 320 from each side surface 301 towards stripe prisms 320 little by little increased width.And if light is when being incident on the single side surface 301, each stripe prisms 320 little by little increases width (seeing also Fig. 9 and Figure 10) from this side towards opposite side.
At this moment, it is desirable to stripe prisms 320 does not form in the mode with the side surface next-door neighbour of light incident on it.Because when stripe prisms 320 formed the side surface of next-door neighbour's light incident on it, light can be dispersed near stripe prisms 320, and produces bright line.
In addition, rear prism 322 is formed on the surface of each stripe prisms 320, so that rear prism 322 is vertical with the incident direction of light by side surface.
After preassigned pattern formation stripe prisms 320, rear prism 322 can be formed on the surface of each stripe prisms 320.Yet, in fact, can form the array of several rear prisms 322, thereby produce the light guide plate of stripe prisms type of the present invention with different in width.
Fig. 9 and Figure 10 illustrate the schematic rear view of the main body 300 (seeing also Fig. 4) of light guide plate, show the embodiment of the arrangement of stripe prisms 320.
The vertical view of the arrangement of stripe prisms 320 when Fig. 9 illustrates light that light source 306 produces and is incident in the opposite side of main body 300 of light guide plate.
As shown in Figure 9, when light when light source is incident in the both sides 301 of main body 300, the rear surface of main body is adjusted the center to each bar 320 little by little increases width so that bar 320 is from main body both sides 301.
Simultaneously, the increase of the distance between each stripe prisms 320 and the side 301 causes arriving its light quantity minimizing.In the case, as mentioned above, when when increasing the width of stripe prisms 320 gradually with the increase of side 301 distances of light incident on it, the size of stripe prisms 320 increases, thereby increases the amount of anaclasis and reflection.
The planimetric map of the arrangement of stripe prisms 320 when Figure 10 illustrates light source 306 (seeing also Fig. 4) and only is arranged at light guide plate one side.
As shown in figure 10, when light when 306 of light sources are incident in a side 301, the rear surface 305 of main body is adjusted, so that each stripe prisms 320 little by little increases width via this zone line to opposite side from a described side.
Simultaneously, as mentioned above, it is desirable to stripe prisms 320 and do not form in mode with the side surface next-door neighbour of light incident on it.
Figure 11 illustrates the planimetric map of the example of the rear surface of light guide plate according to an embodiment of the invention.
As shown in figure 11, the rear surface 305 of light guide plate 30 also comprises a prism 325 in the space of 320 of stripe prisms.
The reason that forms some prism 325 is refractive index and the reflectivity for the light in the space of improving 320 of stripe prisms.
In fact, when BLU adopted the CCFL light source, because the characteristic of BLD, the light quantity of being sent reduced at the far-end (in other words, the far-end of CCFL) of light guide plate, made the edge deepening of back light unit.Therefore, in order to strengthen visibility, inserted some prism 325.
Have circle though each some prism 325 is shown in Figure 11, yet the present invention is not limited to this shape herein.Point prism 325 can have different shape, comprises triangle, rectangle, pentagon, sexangle, ellipse and rhombus etc.In addition, each some prism 325 can form the second amorphism rear prism of no given shape.
Figure 12 and Figure 13 illustrate the planimetric map according to the light guide plate of other embodiments of the invention.
See also Figure 12, the main body 300 of light guide plate has the stripe prisms 320 that is formed on its rear surface 305.And each bar is along with the increase of the distance of the side surface 301 of light incident on it and little by little increase width.Simultaneously, according to this embodiment, light is incident in (as shown in figure 12) on the side surface 301, form the rear prism 322 on the stripe prisms 320 by this way, make the width of rear prism 322 increase, thereby prevented near the visibility of four edges of light guide plate rear surface 305 and the reduction of brightness in four edges near the rear surface 305 of light guide plate.
So the design of bar like pattern can prevent to produce the dark space in light guide plate rear surface 305 edges.
Though, it is desirable on rear prism 322 is formed at stripe prisms 320 with predetermined space the surface and do not have big interval each other, yet as shown in Figure 13, the interval between the rear prism 322 on the stripe prisms 320 can be adjusted, so that adjust brightness and visibility exactly.
Theme of the present invention is that the rear surface of light guide plate main body is formed with stripe prisms 320, each stripe prisms 320 according to and the increase of the distance of the one or more side surfaces of light incident on it increase width, and comprise and be formed at its lip-deep rear prism 322.Therefore, be appreciated that any by revising stripe prisms 320 shape and the invention of acquisition such as interval all be included in the category of the present invention.
Figure 14 illustrates the comparison diagram according to the brightness of the light guide plate of the light guide plate of stripe prisms type of the present invention and traditional some prism type.
Brightness for the light guide plate of the light guide plate of measuring stripe prisms type shown in Figure 14 and traditional some prism type, the light guide plate that is used for the back light unit of 21.2 inches types laterally and vertically is being divided into 5 parts respectively, to form 25 zones, subsequently with cd/m
2For each regional brightness is measured by unit.
According to by the result of two kinds of light guide plate gained relatively, each has as shown in figure 14 aperture than (just the pattern of per unit area than) light guide plate.Should be appreciated that the brightness average specific that comprises the light guide plate of stripe prisms according to the present invention has the leaded light plate hight 10% of a prism or higher traditionally.
May be obvious that from above-mentioned, utilize light guide plate of the present invention, LCD of the present invention can not adopt diffusion sheet and the prismatic lens that is used for back light unit in the conventional liquid crystal, can obtain the effect substantially the same with conventional liquid crystal.In other words, light guide plate according to the present invention just can access the planar light with superior brightness, uniformity coefficient and visibility under the situation of only light source and light guide plate.
The light guide plate that is used for LCD according to the present invention makes the whole lip-deep light quantity that arrives panel of LCD increase equably, and make the light quantity of little vertical direction guiding increase, therefore, compared to traditional light guide plate, light guide plate of the present invention can guarantee superior brightness, uniformity coefficient and visibility.Compare with the light guide plate of a prism type, improve to some extent according to the brightness of light guide plate of the present invention.
Therefore, because back light unit can realize under the situation of diffusion sheet and prismatic lens the two or one of them not having, therefore can reduce the cost of back light unit.
Though for illustrative purpose discloses embodiments of the invention, yet it will be appreciated by those skilled in the art that the present invention is not limited to these embodiment, under the situation that does not break away from the disclosed the spirit and scope of the present invention of described claim, can do various changes, add and retouching.
[primary clustering symbol description]
10: back light unit
100: display panels
105,306: light source
110,30: LGP
113: coarse patterns
115: reflecting plate
120: diffusion sheet
125: prismatic lens
130: screening glass
300: main body
301: side surface
303: front surface
305: the rear surface
310: preceding prism
320: stripe prisms
322: rear prism
325: the some prism
A: plane
D: preset distance
H1: highly
H2: highly
P: length direction
Q: light transmit direction
W1: width
W2: width
θ 1: drift angle
Claims (15)
1. light guide plate that is used for LCD, described light guide plate comprises: light side surface incident thereon, light are from rear surface that its front surface that sends and light reflect thereon;
Wherein, described front surface is formed with preceding prism, each has predetermined cross-sectional described preceding prism, and described rear surface is formed with stripe prisms, each of described stripe prisms comprises rear prism formed thereon, and the width of each described stripe prisms is along with the increase of the distance of this stripe prisms and the light incident described side surface on it and increase.
2. light guide plate as claimed in claim 1, wherein each stripe prisms has the vertical length direction of direction that goes out from light emitted with light.
3. light guide plate as claimed in claim 1, wherein the angular range that is limited between the length direction of the length direction of each stripe prisms and each preceding prism is 30 °～90 °.
4. light guide plate as claimed in claim 3, the length direction of wherein said stripe prisms is provided with perpendicular to the length direction of prism before described.
5. light guide plate as claimed in claim 1 is set to wherein that each has the width of increase near the stripe prisms at the edge of the rear surface of described light guide plate.
6. light guide plate as claimed in claim 1, wherein said stripe prisms each to have drift angle be 60 °～100 ° triangular-section.
7. light guide plate as claimed in claim 1, wherein said before prism each to have drift angle be 90 °～120 ° triangular-section.
8. light guide plate as claimed in claim 1, the spacing of wherein said stripe prisms has transformable yardstick.
9. it is 1: 1 that light guide plate as claimed in claim 1, each of wherein said stripe prisms have scope, and 000～1: 50,000 width is to the length ratio.
10. light guide plate as claimed in claim 1, wherein said before the shape in cross section of prism be selected from triangle, trapezoidal and have a channel shaped of falling of predetermined curvature.
11. light guide plate as claimed in claim 1 is provided with predetermined plane, interval between the wherein said preceding prism.
12. light guide plate as claimed in claim 11, wherein said before prism the total area and be arranged at described before the scope of ratio of the total area on plane, interval between the prism be 1: 0.5～1: 10.
13. light guide plate as claimed in claim 1, wherein before each prism to have scope be 0.3～0.6 height (h
2) to width (w
2) ratio.
14. light guide plate as claimed in claim 1, it also comprises:
Additional prism in the space between the described stripe prisms.
15. a back light unit comprises:
Light source; And
Light guide plate according to claim 1.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020060025038 | 2006-03-17 | ||
| KR1020060025038A KR100662540B1 (en) | 2006-03-17 | 2006-03-17 | Light guide panel for display panel comprising stripe-prism and back light unit for lcd |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101038392A true CN101038392A (en) | 2007-09-19 |
| CN100561309C CN100561309C (en) | 2009-11-18 |
Family
ID=37815830
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006101564064A Expired - Fee Related CN100561309C (en) | 2006-03-17 | 2006-12-29 | The light guide plate of LCD and use its back light unit |
Country Status (4)
| Country | Link |
|---|---|
| KR (1) | KR100662540B1 (en) |
| CN (1) | CN100561309C (en) |
| TW (1) | TWI324277B (en) |
| WO (1) | WO2007108579A1 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102081186A (en) * | 2010-11-30 | 2011-06-01 | 深圳市华星光电技术有限公司 | Backlight module and light guide plate thereof |
| CN102906489A (en) * | 2010-05-31 | 2013-01-30 | 大日本印刷株式会社 | Light-guide panel, planar light-source device, and display device |
| CN103672586A (en) * | 2012-09-19 | 2014-03-26 | 三星显示有限公司 | Backlight unit and display device having the same |
| US9140829B2 (en) | 2010-07-06 | 2015-09-22 | Lg Display Co., Ltd. | Apparatus for fabricating light guide panel and backlight unit having the light guide panel |
| CN106200114A (en) * | 2015-05-26 | 2016-12-07 | 乐金显示有限公司 | There is liquid crystal display and the back light unit thereof of multiple viewing area |
| CN108303764A (en) * | 2017-01-13 | 2018-07-20 | 三星显示有限公司 | Display device |
| CN109920327A (en) * | 2017-12-13 | 2019-06-21 | 南京机器人研究院有限公司 | A kind of wearable intelligent equipment |
| CN109917636A (en) * | 2017-12-13 | 2019-06-21 | 南京机器人研究院有限公司 | A kind of smartwatch adjusting light transmittance |
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| KR100903028B1 (en) | 2007-01-15 | 2009-06-18 | 제일모직주식회사 | Light guide panel comprising wedge type rear prism for back light unit of tft-lcd |
| KR100864320B1 (en) * | 2007-01-17 | 2008-10-20 | 제일모직주식회사 | Light guide panel comprising step structure for back light unit of tft-lcd |
| TWI370273B (en) | 2008-10-17 | 2012-08-11 | Coretronic Corp | Light guide plate |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1152377A (en) * | 1997-07-31 | 1999-02-26 | Nitto Denko Corp | Optical path control platte, surface light source device, polarizing light source device and liquid crystal display device |
| JP2003109417A (en) * | 2000-12-12 | 2003-04-11 | International Manufacturing & Engineering Services Co Ltd | Surface light source device |
| KR100692203B1 (en) * | 2003-01-23 | 2007-03-09 | 제일모직주식회사 | Light guide panel and method for fabricating thereof and back-light assembly using the same and liquid crystal display device using the same |
-
2006
- 2006-03-17 KR KR1020060025038A patent/KR100662540B1/en active IP Right Grant
- 2006-07-13 WO PCT/KR2006/002762 patent/WO2007108579A1/en active Application Filing
- 2006-08-09 TW TW95129266A patent/TWI324277B/en not_active IP Right Cessation
- 2006-12-29 CN CNB2006101564064A patent/CN100561309C/en not_active Expired - Fee Related
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| CN102906489A (en) * | 2010-05-31 | 2013-01-30 | 大日本印刷株式会社 | Light-guide panel, planar light-source device, and display device |
| US9182530B2 (en) | 2010-05-31 | 2015-11-10 | Dai Nippon Printing Co., Ltd. | Light guide plate with tapering unit optical elements |
| US9140829B2 (en) | 2010-07-06 | 2015-09-22 | Lg Display Co., Ltd. | Apparatus for fabricating light guide panel and backlight unit having the light guide panel |
| CN102081186A (en) * | 2010-11-30 | 2011-06-01 | 深圳市华星光电技术有限公司 | Backlight module and light guide plate thereof |
| WO2012071752A1 (en) * | 2010-11-30 | 2012-06-07 | 深圳市华星光电技术有限公司 | Backlight module and light guide plate thereof |
| CN103672586A (en) * | 2012-09-19 | 2014-03-26 | 三星显示有限公司 | Backlight unit and display device having the same |
| CN106200114A (en) * | 2015-05-26 | 2016-12-07 | 乐金显示有限公司 | There is liquid crystal display and the back light unit thereof of multiple viewing area |
| CN106200114B (en) * | 2015-05-26 | 2019-10-18 | 乐金显示有限公司 | Liquid crystal display and its back light unit with multiple display areas |
| CN108303764A (en) * | 2017-01-13 | 2018-07-20 | 三星显示有限公司 | Display device |
| CN108303764B (en) * | 2017-01-13 | 2022-05-13 | 三星显示有限公司 | Display device |
| CN109920327A (en) * | 2017-12-13 | 2019-06-21 | 南京机器人研究院有限公司 | A kind of wearable intelligent equipment |
| CN109917636A (en) * | 2017-12-13 | 2019-06-21 | 南京机器人研究院有限公司 | A kind of smartwatch adjusting light transmittance |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2007108579A1 (en) | 2007-09-27 |
| KR100662540B1 (en) | 2006-12-28 |
| CN100561309C (en) | 2009-11-18 |
| TW200736756A (en) | 2007-10-01 |
| TWI324277B (en) | 2010-05-01 |
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