KR101347304B1 - Diffusion sheet having excellent light shielding property - Google Patents
Diffusion sheet having excellent light shielding property Download PDFInfo
- Publication number
- KR101347304B1 KR101347304B1 KR1020130037370A KR20130037370A KR101347304B1 KR 101347304 B1 KR101347304 B1 KR 101347304B1 KR 1020130037370 A KR1020130037370 A KR 1020130037370A KR 20130037370 A KR20130037370 A KR 20130037370A KR 101347304 B1 KR101347304 B1 KR 101347304B1
- Authority
- KR
- South Korea
- Prior art keywords
- diffusion sheet
- light
- titanium oxide
- diffusion
- amorphous titanium
- Prior art date
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82B—NANOSTRUCTURES FORMED BY MANIPULATION OF INDIVIDUAL ATOMS, MOLECULES, OR LIMITED COLLECTIONS OF ATOMS OR MOLECULES AS DISCRETE UNITS; MANUFACTURE OR TREATMENT THEREOF
- B82B3/00—Manufacture or treatment of nanostructures by manipulation of individual atoms or molecules, or limited collections of atoms or molecules as discrete units
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
-
- 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
Abstract
The present invention provides a diffusion sheet including a diffusion layer containing amorphous titanium oxide particles and a plastic resin, wherein the diffusion layer contains 5 to 25 parts by weight of the amorphous titanium oxide particles with respect to 100 parts by weight of the plastic resin. Diffusing sheet according to the present invention, the diffusing sheet according to the present invention refracts and scatters the light at various angles and directions to subdivide, induce irregular diffuse reflection, and also absorbs the light incident on some sheets to diffuse and disperse light Since the action can be further exhibited and enhanced, it can be usefully used as a diffusion sheet of the backlight unit of the liquid crystal display device.
Description
The present invention relates to a diffusion sheet having excellent light shielding properties, in particular, refracting and scattering light at various angles and directions to subdivide, induce irregular diffuse reflection, and also partially absorb light incident on the sheet to diffuse and diffuse light. The present invention relates to a diffusion sheet capable of exhibiting and enhancing a dispersing effect even more.
BACKGROUND OF THE
In general, flat displays are classified into light emitting and light receiving types. An example of a light-receiving flat panel display is a liquid crystal display device. The liquid crystal display device itself does not emit light to form a liquid crystal image, and light may be incident from outside to form a liquid crystal image.
Therefore, the liquid crystal display which does not emit light by itself serves to evenly illuminate the backlight unit so that the display image is visible from the back of the LCD. The backlight unit mostly includes a light emitting diode (LED) as a light source, and also includes a light guide plate for uniformly dispersing light emitted from the light source over the entire area of the liquid crystal display. In addition, the diffusion sheet includes a diffuser sheet for evenly refracting, dispersing, and diffusely reflecting the light of the backlight light source passing through the light guide plate in various directions. It will play a role.
Referring to FIG. 1, in the
However, since the diffusion sheet according to the related art merely diffuses and diffuses the light of the backlight light source, there is a problem in that the light guide plate pattern is reflected due to the poor function of diffusely reflecting the light in various directions. In addition, recently, a thin film type optical film has been used to realize a thin film type display, and as a smaller amount of optical film is used, a phenomenon in which patterns formed on the light guide plate are reflected on a liquid crystal image has been shown.
Therefore, the light is refracted and scattered at various angles and directions to subdivide, induce irregular diffuse reflections, and also absorb and absorb light incident on some sheets, thereby exhibiting and enhancing diffusion and dispersion of light, thereby providing excellent light shielding. The development of a diffusion sheet capable of exhibiting a function is required.
Accordingly, an object of the present invention is to diffuse, refract, and scatter light at various angles and directions to subdivide it, to induce irregular diffuse reflection, and to absorb light incident on some sheets to further increase diffusion and dispersion of light. It is to provide a diffusion sheet that can be exhibited and promoted.
In order to achieve the above object, the present invention provides a diffusion sheet comprising a diffusion layer containing amorphous titanium oxide particles and a plastic resin, the diffusion layer is 5 to 5 parts by weight of the amorphous titanium oxide particles to 100 parts by weight of the plastic resin It provides a diffusion sheet comprising 25 parts by weight.
Diffusion sheet of the present invention is to refraction and scatter the light at various angles and directions to subdivide, induce irregular diffuse reflection, and also absorb and absorb the light incident on some sheets to further exhibit and enhance the diffusion and dispersion of light It can be used as a diffusion sheet of the backlight unit of the liquid crystal display device.
1 is a diagram schematically showing a cross section of constituent articles constituting a conventional backlight unit.
2 is a schematic cross-sectional view of a diffusion sheet according to an example of the present invention.
3 is a view illustrating a form in which incident light is refracted and scattered in a diffusion sheet according to an example of the present invention.
Hereinafter, the present invention will be described in more detail.
The diffusion sheet of the present invention includes a diffusion layer containing amorphous titanium oxide particles and a plastic resin.
The amorphous titanium oxide particles may be included in the diffusion layer included in the diffusion sheet, thereby diffusing, refracting, and scattering the light incident on the diffusion sheet at various angles and directions, and may have an effect of inducing irregular diffuse reflection. Glossiness can be provided to a sheet.
The amorphous titanium oxide particles may have a size of 0.01 to 10 μm, 0.05 to 5 μm, 0.1 to 1 μm, and 0.3 to 0.5 μm based on the maximum size of the particles.
If the size of the amorphous titanium oxide particles is less than 0.01 ㎛ is not preferable because the dispersibility may be lowered, if the size of the particles exceeds 10 ㎛ the desired refractive and scattering effect is not obtained, uniform due to too large particle size This is undesirable because it may present a problem in dispersibility.
The amorphous titanium oxide particles are in an amorphous form in which the overall form does not have a specific shape, and the titanium oxide itself may be formed in an anatase or rutile crystalline form, but any may be used. Preferably it may be rutile type. Since the rutile type has a high absorbance property for light relative to the anatase type, the rutile type has a high UV absorption effect due to good absorption of ultraviolet rays and exhibits high stability against UV rays (UV reliability). Therefore, it is not yellowed, and since the refractive index (2.7: 2.5) and the dielectric constant (114: 31) are high, it can be used more preferably.
The amorphous titanium oxide particles may be included 5 to 25 parts by weight, preferably 10 to 23 parts by weight, more preferably 15 to 20 parts by weight based on 100 parts by weight of the plastic resin.
The plastic resin may be a thermosetting resin, a UV curable resin, a moisture curable resin, or a mixture thereof, and the thermosetting resin, the UV curable resin, or the water curable resin may be, for example, epoxy, phenol, urethane, polyester, or amino. It may be a thermosetting resin such as a system, UV-curable resin such as acrylic, vinyl-based, moisture-curable resin containing a silicone group, such as one-component silicone, specific examples thereof include (meth) acrylate-based resin, unsaturated polyester resin, Polyester (meth) acrylate resin, silicone urethane (meth) acrylate resin, silicone polyester (meth) acrylate resin, fluorine urethane (meth) acrylate resin, phenol resin, epoxy resin, urea formaldehyde resin, melamine form Aldehyde resins and mixtures thereof. Preferably, a thermosetting resin having excellent high temperature, high humidity, and UV resistance in terms of resin used in a general light shielding diffusion sheet may be used.
In addition, the diffusion sheet of the present invention may include a filler in addition to the amorphous titanium oxide particles for the diffusion function if necessary.
The filler may be an organic polymer filler including a material selected from hard acrylate, polystyrene, nylon, soft acrylate and silicone, and among these, hard acrylate having good solvent resistance and easy dispersion is preferable. The filler is preferably spherical, and may have an average particle diameter of 0.5 to 5 μm, preferably 0.8 to 3 μm. The filler preferably has a refractive index of 0.02 or more that is different from the refractive index of the plastic resin.
The filler may be used in an amount of 40 to 80 parts by weight, preferably 50 to 60 parts by weight based on 100 parts by weight of the plastic resin forming the diffusion layer.
The diffusion sheet of the present invention may be prepared by a conventional sheet or film manufacturing method such as injection, extrusion, wet coating, casting, etc., and may also be prepared to form a coating layer in the form of a sheet by coating on the upper surface of the light guide plate.
Diffusion sheet of the present invention may have a thickness of 38 to 270 ㎛, 100 to 270 ㎛, 150 to 270 ㎛.
The plastic resin may include additional thermosetting agents, UV curing agents, curing accelerators, coupling agents, photoacid generators, antioxidants, surfactants, radical initiators, and mixtures thereof, if necessary, by mixing them with a solvent. In the form of the resulting plastic composition, the diffusion sheet of the present invention can be used for production. For example, when the plastic resin is a thermosetting resin, the composition may include a thermosetting resin, a thermosetting agent, a curing accelerator, a coupling agent, an antioxidant, and a solvent.
The thermosetting agent is not particularly limited as long as it can be generally used for thermosetting the thermosetting resin, and examples thereof include amine curing agents, acid anhydride curing agents, imidazole curing agents, carboxylic acid curing agents, organic acid hydrazide curing agents, and phenols. And a curing agent, a polyol curing agent, an oxazoline curing agent, a melamine curing agent, or a mixture thereof.
As the curing accelerator, any one can be used as long as it can perform a function of promoting the reaction between the thermosetting resin and the thermosetting agent. For example, an imidazole curing accelerator, a phosphine curing accelerator, an ammonium curing accelerator, a Lewis acid curing accelerator. Or mixtures thereof.
As said coupling agent, a silane coupling agent, a titanate coupling agent, an aluminate coupling agent, a silicone compound, etc. are mentioned, These coupling agents can be used individually or in mixture.
Examples of the antioxidant include phenol-based, sulfur-based or phosphorus-based antioxidants, and the antioxidants may be used to improve the heat resistance stability of the cured product by preventing oxidative degradation during thermosetting of the thermosetting resin composition.
The solvent may be compatible with the above-described plastic resin composition components, but does not react with any of them, as long as it is a known solvent used in the resin composition. Examples of such a solvent include methyl ethyl ketone, methyl isobutyl ketone, toluene, xylene, butyl acetate or cyclohexanone. The said solvent can be used individually or in mixture of 2 or more types.
Hereinafter, the diffusion sheet of the present invention will be described in more detail with reference to the drawings, but the drawings are intended to illustrate the present invention, but the scope of the present invention is not limited thereto.
2 is a cross-sectional view schematically showing a diffusion sheet according to an embodiment of the present invention.
2, the
3 is a view showing a principle that the diffusion sheet of the present invention diffuses and diffuses light.
Referring to FIG. 3, light incident through the light guide plate into the
Therefore, the diffusion sheet of the present invention diffuses, refracts, and scatters light at various angles and directions, thereby subdividing it, inducing irregular diffuse reflection, and also absorbing light incident on some sheets to further diffuse and disperse light. Can be greatly exerted and promoted.
In addition, the diffusion sheet of the present invention has an excellent shielding performance, it is possible to suppress the phenomenon that the patterns formed on the light guide plate is reflected on the liquid crystal image, it can exhibit the effect of improving the screen visibility of the liquid crystal display device.
Hereinafter, the present invention will be described in detail by way of examples. However, the following examples are illustrative of the present invention, and the contents of the present invention are not limited by the following examples.
Example 1
Amorphous titanium oxide particles having a minimum particle size of 0.01 μm and a maximum particle size of 10 μm in 100 parts by weight of a vinyl copolymer resin (Aekyung Chemical Co., Ltd., acrylic copolymer A-811) mainly composed of methacrylate esters (for plastics) 15 parts by weight of Ti-pure R-104, manufactured by DuPont, 50 parts by weight of PMMA acrylic organic filler, and 300 parts by weight of a mixed solvent consisting of toluene and cyclohexanone were mixed to prepare a resin composition. The resin composition thus prepared was applied to a transparent polyethylene terephthalate film (V7200, SKC, Inc.) having a thickness of 188 μm using a wet coating method to form a diffusion layer having a thickness of 15 μm, and then dried for 90 seconds using a dryer. The diffusion sheet was manufactured by heat-irradiating and hardening at the temperature of 100 degreeC.
Example 2
A diffusion sheet was prepared in the same manner as in Example 1, except that 5 parts by weight of amorphous titanium oxide particles (Ti-pure R-104 for plastic, manufactured by DuPont) was used.
Example 3
A diffusion sheet was prepared in the same manner as in Example 1, except that 25 parts by weight of amorphous titanium oxide particles (Ti-pure R-104 for plastics, manufactured by DuPont) were used.
Comparative Example 1
80 parts by weight of a PMMA acrylic organic filler and 200 parts by weight of a mixed solvent composed of toluene and cyclohexanone are mixed with 100 parts by weight of a vinyl copolymer resin (Aekyung Chemical Co., Ltd., acrylic copolymer A-811) mainly composed of methacrylate ester. A resin composition was prepared. After applying the prepared resin composition to the transparent polyethylene terephthalate film (V7200, SKC Co., Ltd.) having a thickness of 188 ㎛ using a wet coating method to form a diffusion layer having a thickness of 20 ㎛, using a dryer for 90 seconds, The diffusion sheet was manufactured by heat-irradiating and hardening at the temperature of 100 degreeC.
Experimental Example
Each of the diffusion sheets manufactured in Examples 1 to 3 and Comparative Example 1 was placed on a driving CCFL BLU lamp one by one, and the shielding force was measured while comparing lamp masking. Based on the level of the mask masking shielding power of the diffusion sheet according to Comparative Example 1, the relative shielding power of the diffusion sheet of Examples 1 to 3 qualitatively exhibited, specifically, the shielding degree of the CCFL BLU lamp is 100% Is excellent when the CCFL BLU lamp is 80% shielded, when the CCFL BLU lamp is 60% good, and when the CCFL BLU lamp is 40% poor. As shown. In addition, the luminance of each of the diffusion sheets manufactured in Examples 1 to 3 and Comparative Example 1 was measured by using a conometer manufactured by Spitek Co., Ltd., based on the luminance of the diffusion sheet according to Example 1 (100). %), And the relative luminance values of the diffusion sheets of Examples 2 and 3 and Comparative Example 1 were obtained. The measurement results are shown in Table 1.
As can be seen from Table 1, the diffusion sheet of Example 1 containing 15 parts by weight of amorphous titanium oxide particles with respect to 100 parts by weight of the plastic resin was found to have excellent shielding force. On the other hand, the diffusion sheet of Comparative Example 1, which does not contain amorphous titanium oxide particles, it was found that the brightness is improved compared to the diffusion sheet of Example 1, but the shielding power is poor.
On the other hand, Example 2 containing a relatively small amount of amorphous titanium oxide particles compared to the diffusion sheet of Example 1 was found that the shielding power decreases with the increase in brightness, the implementation containing a relatively large amount of amorphous titanium oxide particles In Example 3, it was found that shielding force increased with decreasing luminance. As such, when the amorphous titanium oxide particles are included in the range of 5 to 25 parts by weight with respect to 100 parts by weight of the plastic resin, the shielding strength of the diffusion sheet can be maintained while maintaining excellent brightness, and thus, the amorphous titanium oxide is in the above range. By adjusting the content of the particles, it was confirmed that the brightness and shielding power of the diffusion sheet can be properly adjusted according to the desired conditions.
1: backlight unit 10: light guide plate
20: diffusion sheet 30: light collecting sheet
40: protective sheet 50: reflective sheet
100: diffusion sheet 110: amorphous titanium oxide
120: plastic resin
Claims (6)
The diffusion sheet includes 5 to 25 parts by weight of the amorphous titanium oxide particles with respect to 100 parts by weight of the vinyl resin containing the methacryl ester.
A diffusion sheet having a size of the amorphous titanium oxide particles of 0.01 to 10 ㎛.
A diffusion sheet of the amorphous titanium oxide particles is rutile type.
Diffusion sheet of 38 to 270 ㎛ thickness of the diffusion sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020130037370A KR101347304B1 (en) | 2013-04-05 | 2013-04-05 | Diffusion sheet having excellent light shielding property |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020130037370A KR101347304B1 (en) | 2013-04-05 | 2013-04-05 | Diffusion sheet having excellent light shielding property |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| KR101347304B1 true KR101347304B1 (en) | 2014-01-06 |
Family
ID=50144443
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020130037370A KR101347304B1 (en) | 2013-04-05 | 2013-04-05 | Diffusion sheet having excellent light shielding property |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR101347304B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20160041712A (en) * | 2014-10-08 | 2016-04-18 | 에스케이씨하스디스플레이필름(유) | Diffusion sheet comprising yellow phosphor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005037737A (en) * | 2003-07-16 | 2005-02-10 | Nitto Denko Corp | Particle dispersed resin sheet, substrate for image display device, and image display device |
| US20050164117A1 (en) | 2004-01-26 | 2005-07-28 | Fuji Photo Film Co., Ltd. | Diffusion transfer film unit for seal print |
| KR100680126B1 (en) | 2005-03-16 | 2007-02-07 | 도레이새한 주식회사 | Void-formed light-diffusing sheet for tft-lcd |
| WO2011134674A1 (en) * | 2010-04-30 | 2011-11-03 | Styron Europe Gmbh | Improved light diffusing composition |
-
2013
- 2013-04-05 KR KR1020130037370A patent/KR101347304B1/en active IP Right Grant
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005037737A (en) * | 2003-07-16 | 2005-02-10 | Nitto Denko Corp | Particle dispersed resin sheet, substrate for image display device, and image display device |
| US20050164117A1 (en) | 2004-01-26 | 2005-07-28 | Fuji Photo Film Co., Ltd. | Diffusion transfer film unit for seal print |
| KR100680126B1 (en) | 2005-03-16 | 2007-02-07 | 도레이새한 주식회사 | Void-formed light-diffusing sheet for tft-lcd |
| WO2011134674A1 (en) * | 2010-04-30 | 2011-11-03 | Styron Europe Gmbh | Improved light diffusing composition |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20160041712A (en) * | 2014-10-08 | 2016-04-18 | 에스케이씨하스디스플레이필름(유) | Diffusion sheet comprising yellow phosphor |
| KR101686210B1 (en) | 2014-10-08 | 2016-12-13 | 에스케이씨하스디스플레이필름(유) | Diffusion sheet comprising yellow phosphor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9804311B2 (en) | Higher transmission light control film comprising a transmissive region and an absorptive region each having a different index of refraction | |
| CN1924624A (en) | Substrate film for optical sheet, optical sheet and backlight unit | |
| TWI432793B (en) | Diffuser sheet and backlight unit using it | |
| KR20110092343A (en) | Optical component, lighting device, and display device | |
| TWI514013B (en) | A backlight unit for a liquid crystal display device | |
| KR20160031033A (en) | Light-diffusing element, polarizer having light-diffusing element, and liquid crystal display device having same | |
| CN106461820A (en) | Light diffusing sheet, and backlight device comprising said sheet | |
| JP2010210882A (en) | Optical sheet and display using the same | |
| KR102214924B1 (en) | diffuser sheet and display unit | |
| KR101347304B1 (en) | Diffusion sheet having excellent light shielding property | |
| KR101227304B1 (en) | Optical sheet | |
| KR20120078508A (en) | Optical sheet | |
| JP2010256431A (en) | Laminated resin sheet, and backlight unit and display device using the same | |
| JP2011033643A (en) | Optical path changing sheet, backlight unit and display device | |
| JP2010044269A (en) | Light diffusion plate, optical sheet, back light unit and display device | |
| JP2009198749A (en) | Light beam control member | |
| JP2012204192A (en) | Backlight device | |
| CN110007504A (en) | Polarizer screening glass, polarizer and liquid crystal display device | |
| JP2014044425A (en) | Optical sheet for surface light source device | |
| JP2018205640A (en) | Optical sheet, image source unit, and liquid crystal display device | |
| KR20230002866A (en) | Optical sheets, backlight units, liquid crystal displays and information devices | |
| JP6288358B2 (en) | Daylighting member | |
| JP2010262827A (en) | Surface light source device and liquid crystal display device | |
| KR20110133678A (en) | Light-diffusing sheet for lcd back light unit | |
| JP2011064744A (en) | Optical sheet, backlight unit, and display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A201 | Request for examination | ||
| A302 | Request for accelerated examination | ||
| E902 | Notification of reason for refusal | ||
| E701 | Decision to grant or registration of patent right | ||
| GRNT | Written decision to grant | ||
| FPAY | Annual fee payment |
Payment date: 20160922 Year of fee payment: 4 |
|
| FPAY | Annual fee payment |
Payment date: 20170907 Year of fee payment: 5 |