KR20130027705A - Micro lens sheet and lcd including the same, and method of fabricating micro lens sheet - Google Patents
Micro lens sheet and lcd including the same, and method of fabricating micro lens sheet Download PDFInfo
- Publication number
- KR20130027705A KR20130027705A KR1020110091080A KR20110091080A KR20130027705A KR 20130027705 A KR20130027705 A KR 20130027705A KR 1020110091080 A KR1020110091080 A KR 1020110091080A KR 20110091080 A KR20110091080 A KR 20110091080A KR 20130027705 A KR20130027705 A KR 20130027705A
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- KR
- South Korea
- Prior art keywords
- light
- lens sheet
- micro lens
- liquid crystal
- diffusion patterns
- Prior art date
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0012—Arrays characterised by the manufacturing method
- G02B3/0018—Reflow, i.e. characterized by the step of melting microstructures to form curved surfaces, e.g. manufacturing of moulds and surfaces for transfer etching
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
- G02B5/0215—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having a regular structure
-
- 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
- G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
-
- 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
- G02F1/133526—Lenses, e.g. microlenses or Fresnel lenses
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mathematical Physics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Planar Illumination Modules (AREA)
- Liquid Crystal (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
Description
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to a micro lens sheet capable of realizing high brightness, a light weight and a thin film, and a method of manufacturing a liquid crystal display device and a micro lens sheet with improved display quality and high brightness.
In line with the recent information age, the display field has also been rapidly developed, and a liquid crystal display device (FPD) is a flat panel display device (FPD) having advantages of thinning, light weight, and low power consumption. LCD, plasma display panel device (PDP), electroluminescence display device (ELD), field emission display device (FED), etc. : It is rapidly replacing CRT.
Among them, liquid crystal display devices are used most actively in the field of notebooks, monitors, TVs, etc. because of their excellent contrast ratio and high contrast ratio, and liquid crystal display devices do not have their own light emitting elements. Will be required.
Accordingly, a backlight unit having a light source is provided on a rear surface of the liquid crystal panel to irradiate light toward the front of the liquid crystal panel, thereby realizing an image of identifiable luminance.
Meanwhile, a general backlight unit is classified into a side light method and a direct type method according to an arrangement of light sources. The side light method is a structure in which one or a pair of light sources is disposed at one side of the light guide plate. It has, or two or two pairs of light sources have a structure arranged on each side of the light guide plate, the direct type has a structure in which several light sources are arranged under the optical sheet.
Here, the side light method is easier to manufacture than the direct type method, and has the advantages of lighter weight and lower power consumption than the direct type.
1 is a cross-sectional view of a liquid crystal display device using a general side light type backlight unit.
As illustrated, a general liquid crystal display device includes a
The
In this case, polarizing
And, the rear of the
Here, the
The
Therefore, the light emitted from the
On the other hand, the liquid crystal display device is a trend that the use area, such as a computer monitor and a wall-mounted television, as well as a portable display device is gradually widening, and research on a thin liquid crystal display device having a large display area has been actively conducted.
However, when a thin liquid crystal display device is to be implemented, a spectral mura or hot band in which light is dispersed appears at a viewing angle in which the luminance distribution changes rapidly.
Such spectral mura and hot band are a factor of degrading the image quality of the liquid crystal display.
Therefore, in order to solve this problem, if the number of optical sheets is increased, the image quality is improved, but the production cost of the
In addition, the thinness and the light weight of the liquid crystal display may be inhibited, and in particular, the luminance of the liquid crystal display may be reduced.
The present invention is to solve the above problems, and to provide an optical sheet that can improve the brightness as a first object.
Through this, an object of the present invention is to provide a liquid crystal display device with improved display quality and high brightness while providing light weight and thinness.
According to an aspect of the present invention, there is provided a liquid crystal display comprising: a liquid crystal panel; A light source positioned under the liquid crystal panel; A microlens sheet seated on the light source and having a plurality of diffusion patterns formed on one surface facing the liquid crystal panel, wherein the plurality of diffusion patterns are spaced apart from each other to form a flat portion therebetween; And a reflecting plate disposed under the micro lens sheet, wherein the flat portion has a width of 1/2 to 1 of a width of a bottom surface of the plurality of diffusion patterns.
At this time, the height of the plurality of diffusion patterns is 1/3 to 1/2 of the width of the bottom surface of the plurality of diffusion patterns, the plurality of diffusion patterns is one selected from the dome shape, triangular pyramid, square pyramidal.
At least one of a light collecting sheet and a diffusion sheet is positioned between the micro lens sheet and the light source, and the micro lens sheet includes a support layer, and the plurality of diffusion patterns protrude from the support layer.
In addition, the support layer has a haze characteristic, and a diffusion layer is provided on the rear surface of the support layer.
In this case, a light guide plate is formed between the reflective plate and the micro lens sheet, and the light source is arranged on one side or both sides of the light guide plate.
In addition, the present invention and the support layer; It is formed on one surface of the support layer, a plurality of diffusion patterns are formed, the plurality of diffusion patterns include a microlens layer spaced apart from each other to form a flat portion therebetween, the width of the flat portion of the plurality of diffusion patterns Provide a micro lens sheet of 1/2 to 1 of the width of the base.
At this time, the height of the plurality of diffusion patterns is 1/3 to 1/2 of the width of the bottom surface of the plurality of diffusion patterns.
The present invention also provides a micro lens sheet including a resin tank containing a resin, a gravure roll in which a predetermined portion is locked in the tank, and a doctor blade for forming a pattern on the resin on the surface of the gravure roll. A method of manufacturing a micro lens sheet using a manufacturing apparatus, the method comprising: applying the resin to the surface of the gravure roll by rotating the gravure roll; Transferring the resin coated on the surface of the gravure roll to the base film while the base film is moved in one direction to the top of the gravure roll; It provides a micro lens sheet manufacturing method comprising the step of forming a diffusion pattern spaced apart from each other on the resin applied on the base film by controlling the distance between the doctor blade and the base film.
At this time, the distance between the doctor blade and the base film is made through the height adjustment of the doctor blade.
As described above, according to the present invention, a flat portion is formed between the dome-shaped patterns adjacent to each other in the micro lens sheet of the optical sheet, so that the micro lens sheet diffuses and diffuses some light and at the same time collects some light. The effect of dispersing and diffusing light can prevent spectral mura or hot bands in which light is dispersed at the viewing angle at which the luminance distribution changes rapidly. There is.
In addition, there is an effect of providing a high brightness liquid crystal display device through the effect of condensing light.
In addition, by forming the micro lens sheet through the micro gravure (micro gravure), there is an effect that can improve the efficiency of the process compared to the conventional method to take out through the mold having the shape of the pattern.
1 is a cross-sectional view of a liquid crystal display device using a general side light type backlight unit.
2 is an exploded perspective view of a liquid crystal display device according to an embodiment of the present invention.
3 is an exploded perspective view of the liquid crystal panel of FIG. 2;
4 is an exploded perspective view of the backlight unit of FIG. 2;
5 is an enlarged cross-sectional view of the micro lens sheet of FIG. 4;
6 is a cross-sectional view schematically showing a method for manufacturing a micro lens sheet according to an embodiment of the present invention.
Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings.
2 is an exploded perspective view of a liquid crystal display according to an exemplary embodiment of the present invention, and FIG. 3 is an exploded perspective view of the liquid crystal panel of FIG. 2.
As shown, the liquid crystal display comprises a
First, referring to FIG. 3, which is an exploded perspective view of the
The
A
First and second polarizing
In addition, the gate and the data printed
At this time, although not clearly shown in the figure, the upper and lower alignment films for determining the initial alignment direction of the liquid crystal are interposed at the boundary between the two
Therefore, the
In addition, the liquid crystal display according to the present invention includes a
The
The
At this time, the
In addition, the
The
In particular, the micro lens sheet 200 (refer to FIG. 4) of the present invention refracts and scatters light and simultaneously condenses some light so that a spectral mura or hot band of a liquid crystal display is generated. To improve the brightness at the same time. We will discuss this in more detail later.
In the
As a result, the
The
In addition, the
A support main 130 having a rectangular frame shape seated on the
The cover
4 is an exploded perspective view of the backlight unit of FIG. 2, and FIG. 5 is an enlarged cross-sectional view of the microlens sheet of FIG. 4.
As shown, the
The
At this time, the plurality of
In addition to the
The
Accordingly, the
In addition, the
The
The
Here, each of the first and second
Therefore, the first and second
In addition, the
In particular, the
That is, as shown in Figure 5, the
Here, the thickness t of the
The
Haze (%) = ({Total Transmission Amount of Light-Straight Light Amount} / {Total Transmission Amount of Light}) × 100 .... Equation (1)
By adjusting the haze value, the desired luminance and viewing angle can be realized. If the haze value is 30% or less, the light diffusion rate is low and the viewing angle is narrowed. You lose.
The haze value of the
In this case, the
In addition, the
The
In this case, when the
The plurality of dome-shaped
In this case, the dome-shaped
Accordingly, the
Accordingly, the
In more detail, the surface of the dome-shaped
The
The refracting
In addition, the
At this time, the
Therefore, the
In addition, through the effect of condensing light to provide a high brightness liquid crystal display device.
At this time, the height h of the dome-shaped
For example, when the diameter D of the dome-shaped
In addition, the separation distance between the dome-shaped
That is, the
For example, when the width w of the dome-shaped
On the other hand, in order to further diffuse the light incident to the
Table 1 below is an experimental result of measuring luminance according to the presence of the
Prior to the description, Table 1 shows a first
Referring to Table (1), it can be seen that the luminance of Sample 2 is higher than that of Sample 1, which is a
In particular, it can be seen that the luminance of the sample 3 is higher than that of the sample 2, which means that the height h of the dome-shaped
Therefore, the
Therefore, the
In addition, through the effect of condensing light to provide a high brightness liquid crystal display device.
Hereinafter, a manufacturing method of the
The
6 is a cross-sectional view schematically showing a method of manufacturing a micro lens sheet according to an embodiment of the present invention.
As shown, the manufacturing apparatus of the micro-lens sheet (200 of FIG. 5) is a gravure roll 310 (gravure roll: 310) that is largely locked by rotating a portion of the
Looking at this in more detail, the
In addition, first and second guide rolls 360a and 360b which guide the movement of the
At this time, the
Therefore, in the process of moving the
That is, when a part of the
The
The
That is, in order to form convex portions of the plurality of dome-shaped
That is, the
Accordingly, the present invention improves the efficiency of the process compared to the conventional method of taking out a mold (not shown) having a pattern shape by forming a micro lens sheet (200 of FIG. 5) through micro gravure. You can.
That is, the existing mold method is formed by pressing a mold mold (not shown) in which the shape of the pattern to be formed is formed on the
In contrast, the present invention forms a microlens sheet (200 in FIG. 5) through a roll to roll method and simultaneously forms a microlens layer (220 in FIG. 5) through microgravure, thereby forming a separate mold. The mold (not shown) can be deleted, thereby preventing the process cost from increasing, and by controlling the height of the
As described above, in the liquid crystal display of the present invention, the microlens sheet (FIG. 5) is formed by forming the
Therefore, the
In addition, through the effect of condensing light to provide a high brightness liquid crystal display device.
In particular, the present invention by forming a micro lens sheet (200 in Figure 5) through a micro gravure (micro gravure), thereby improving the efficiency of the process compared to the conventional method of taking out through a mold having a pattern shape (not shown) You can.
Meanwhile, in the above description and the accompanying drawings, the LED assembly (129 of FIG. 4) has been described as a side light method located at one side of the light guide plate (123 of FIG. 4). A direct type for arranging a plurality of LED assemblies (129 of FIG. 4) side by side is also possible. In this case, the light guide plate (123 of FIG. 4) may be omitted.
In addition, a diffusion sheet (not shown) may be further disposed below the first
The present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention.
200: Micro Lens Sheet
210: support layer, 211: bead
220: microlens layer, 230: dome pattern (230a: center portion, 230b: refractive portion)
Claims (12)
A light source positioned under the liquid crystal panel;
A microlens sheet seated on the light source and having a plurality of diffusion patterns formed on one surface facing the liquid crystal panel, wherein the plurality of diffusion patterns are spaced apart from each other to form a flat portion therebetween;
Reflector located under the micro lens sheet
And a flat portion having a width of 1/2 to 1 of a width of a bottom surface of the plurality of diffusion patterns.
The height of the plurality of diffusion patterns is 1/3 to 1/2 of the width of the bottom surface of the plurality of diffusion patterns.
The plurality of diffusion patterns is one selected from a dome shape, a triangular pyramid shape, and a square pyramid shape.
And at least one of a light collecting sheet and a diffusion sheet between the micro lens sheet and the light source.
The micro lens sheet includes a support layer, and the plurality of diffusion patterns protrude from the support layer.
The support layer has a haze characteristic liquid crystal display device.
And a diffusion layer disposed on a rear surface of the support layer.
And a light guide plate between the reflective plate and the micro lens sheet, wherein the light source is arranged on one side or both sides of the light guide plate.
It is formed on one surface of the support layer, a plurality of diffusion patterns are formed, the plurality of diffusion patterns are spaced apart from each other microlens layer having a flat portion formed therebetween
/ RTI >
The width of the flat portion is a micro lens sheet of 1/2 ~ 1 of the width of the bottom of the plurality of diffusion patterns.
The height of the plurality of diffusion patterns is a micro lens sheet of 1/3 to 1/2 of the width of the bottom of the plurality of diffusion patterns.
Applying the resin to the surface of the gravure roll by rotating the gravure roll;
Transferring the resin coated on the surface of the gravure roll to the base film while the base film is moved in one direction to the top of the gravure roll;
Forming a diffusion pattern spaced apart from each other on the resin coated on the base film by controlling a distance between the doctor blade and the base film;
Micro lens sheet manufacturing method comprising a.
The distance between the doctor blade and the base film is made through the height adjustment of the doctor blade micro lens sheet manufacturing method.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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KR1020110091080A KR20130027705A (en) | 2011-09-08 | 2011-09-08 | Micro lens sheet and lcd including the same, and method of fabricating micro lens sheet |
Applications Claiming Priority (1)
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KR1020110091080A KR20130027705A (en) | 2011-09-08 | 2011-09-08 | Micro lens sheet and lcd including the same, and method of fabricating micro lens sheet |
Publications (1)
Publication Number | Publication Date |
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KR20130027705A true KR20130027705A (en) | 2013-03-18 |
Family
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KR1020110091080A KR20130027705A (en) | 2011-09-08 | 2011-09-08 | Micro lens sheet and lcd including the same, and method of fabricating micro lens sheet |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20150054468A (en) * | 2013-11-12 | 2015-05-20 | 엘지디스플레이 주식회사 | Optical Sheet And Back Light Unit Having The Same |
US10782588B2 (en) | 2016-11-11 | 2020-09-22 | Electronics And Telecommunications Research Institute | Optoelectronic element |
KR102262538B1 (en) * | 2020-08-12 | 2021-06-08 | 이상환 | Stereoscopic imaging film and method for manufacturing stereoscopic imaging film |
-
2011
- 2011-09-08 KR KR1020110091080A patent/KR20130027705A/en not_active Application Discontinuation
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20150054468A (en) * | 2013-11-12 | 2015-05-20 | 엘지디스플레이 주식회사 | Optical Sheet And Back Light Unit Having The Same |
US10782588B2 (en) | 2016-11-11 | 2020-09-22 | Electronics And Telecommunications Research Institute | Optoelectronic element |
US11215899B2 (en) | 2016-11-11 | 2022-01-04 | Electronics And Telecommunications Research Institute | Optoelectronic element |
KR102262538B1 (en) * | 2020-08-12 | 2021-06-08 | 이상환 | Stereoscopic imaging film and method for manufacturing stereoscopic imaging film |
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