KR20080012114A - Multifunctional-optical articles for display - Google Patents

Abstract

A multifunctional optical member for a display is provided to have high heat resistance, moisture resistance, light resistance, color purity, and brightness in comparison with a conventional transparent plastic film. A multifunctional optical member for a display includes an engineering plastic resin of 100 wt% and at least one kind of selective wavelength absorbing pigment with a melting point of 200°C. The at least one kind of selective wavelength absorbing pigment is a neon light absorbing pigment or a near infrared ray absorbing pigment. The engineering plastic resin is selected from a ground consisting of a polyester resin, an acrylic resin, a cellulose resin, a polyolefin resin, a polyvinyl chloride resin, a polycarbonate resin, a phenol resin, and a urethane resin.

Description

Optical member for composite functional display {MULTIFUNCTIONAL-OPTICAL ARTICLES FOR DISPLAY}

1 is a graph showing the durability at high temperature for the CIR pigments used in one embodiment of the present invention.

Figure 2 is a graph showing the transmittance measured using the UV-Vis spectrum of the CIR pigments used in one embodiment of the present invention.

Figure 3 is a graph showing the durability at high temperature for the TAP series pigments used in one embodiment of the present invention.

Figure 4 is a graph showing the transmittance measured using the UV-Vis spectrum of the TAP series pigments used in one embodiment of the present invention.

5 is a graph showing the transmittance of the optical member for a composite functional display manufactured in one embodiment of the present invention.

The present invention relates to an optical member for a composite functional display, and more particularly, to block light in the near infrared region (900 to 1200 nm) as well as to block neon light in the 550 to 610 nm region that emits orange light. PDP is excellent in selective light-blocking characteristics, heat resistance, moisture resistance, light resistance compared to the conventional transparent plastic optical member, and color purity and brightness is improved, pursuing good quality and cost reduction, structure simplification, and complex function The present invention relates to an optical member for a composite functional display, which can be used for a display filter such as the present invention, and is also applicable to LCD, OLED, flexible display, and the like, for improving optical characteristics.

As the modern society is highly informationized, photoelectonics-related components and devices have been remarkably advanced and spread. Among them, display apparatuses for displaying images are widely used for television apparatuses, monitor apparatuses of personal computers, and the like, and at the same time, such displays are being enlarged and thinned. Particularly, in the PDP apparatus, discharge occurs in the gas between the electrodes by a direct current or an alternating voltage applied to the electrode, and the phosphor emits light by exciting the phosphor due to the radiation of ultraviolet rays, thereby making it larger and thinner than the conventional CRT. And various display abilities such as display capacity, brightness, contrast, afterimage, viewing angle, and the like, have been spotlighted as next generation display devices.

However, the PDP device has a large amount of electromagnetic waves and near-infrared radiation due to its driving characteristics, which may adversely affect the human body and may cause malfunctions of precision devices such as a wireless telephone or a remote controller. Therefore, in order to make such a PDP apparatus, it is required to suppress electromagnetic wave and near-infrared emission emitted from a PDP apparatus below predetermined value. In addition, functions such as antireflection of light surface and improvement of color freshness are required. Such a functional optical member is stacked on the front of the PDP device is called a PDP filter.

PDP devices are currently required to reduce prices from consumers due to competition with other displays. In particular, the PDP filter has a structure in which at least four optical members are stacked, and these components account for a large portion of raw material prices. Therefore, the next generation PDP filter needs the technology of simplification of raw and subsidiary material structure and complex function.

In addition, in the case of LCD, OLED, and Flexible Display, there is an increasing demand for a composite functional optical member capable of increasing color purity and luminance in a range that does not interfere with transmittance and visible light reflectance due to the concept of an optical member for improving color purity and luminance. to be.

In order to solve the problems of the prior art as described above, the present invention not only blocks light in the near infrared region (900-1200 nm) but also selectively blocks the light in the 550-610 nm region that emits orange light. An object of the present invention is to provide an optical member for a composite functional display having excellent properties and stable physical properties.

Moreover, an object of this invention is to provide the display filter provided with the said optical member for composite functional displays in one area | region.

An optical member for a composite functional display according to an aspect of the present invention comprises a) an engineering plastic resin and b) at least one or more optional wavelength absorbing pigments having a melting point of at least 200 ° C.

The optical member for a composite functional display may include a) 100 parts by weight of an engineering plastic resin, b) 0.00001 to 10 parts by weight of a neon light absorbing dye, and c) 0.0001 to 10 parts by weight of a near infrared absorbing dye having a melting point of at least 250 ° C. .

Optical display for display according to an aspect of the present invention is a base member, a) an engineering plastic resin; And b) an optical member comprising at least two or more selective wavelength absorbing pigments comprising a neon light absorbing dye having a melting point of at least 200 ° C. and blocking a 550-610 nm region, and a near infrared absorbing dye having a melting point of at least 250 ° C. .

Hereinafter, the present invention will be described in detail.

The present inventors mix and melt selective wavelength absorbing dyes, such as neon light absorbing dyes and near infrared absorbing dyes, respectively or simultaneously to plastic resins, so that the inherent functions of the dyes are not lost when the dyes are mixed and melted with the engineering plastics resin. In addition, since the color coordinates are uniformly displayed for each section after the manufacture of the optical member, the optical characteristics are excellent, and not only the neon light and the near infrared light can be effectively absorbed, but also the color correction function can be performed by absorbing light of a specific wavelength band. It was confirmed that the optical member for a display having a composite function can be manufactured, and thus the present invention has been completed.

The optical member may be effectively molded in consideration of characteristics, uses, and the like of the required optical member, using various molding methods such as injection, coextrusion, as well as extrusion.

In addition, the optical member may be processed to have various forms such as a film form and a sheet form.

In one aspect, the composite functional display optical member of the present invention may comprise a) an engineering plastic resin, b) a neon light absorbing pigment and c) a near infrared absorbing pigment having a melting point of at least 250 ° C.

The engineering plastic resin of a) used in the present invention can ensure high transparency, and can use a general-purpose resin that is easy in cost, handleability, weight, and the like. Specifically, polyester resin, acrylic resin, cellulose resin, polyolefin (polyethylene, polypropylene, copolymers thereof, etc.) resin, polyvinyl chloride resin, polycarbonate resin, phenol resin, or Urethane type resin etc. can be used.

In particular, it is preferable to use a polycarbonate resin having excellent heat resistance and optical properties as the engineering plastic resin.

In addition, as the engineering plastic resin, a polyester resin having a good balance of heat resistance and flexibility may be used, and more preferably, polybutylene terephthalate, polyethylene-2,6-naphthalate, polyethylene terephthalate (PET), or the like. Resin is used.

The near-infrared absorbing dye of c) used in the present invention is not particularly limited as long as it is a dye that absorbs maximum in the near infrared region (wavelength of 800 to 1,100 nm). However, since the optical member for composite functional displays of the present invention mixes and melts an engineering plastic resin and a dye at a high temperature, it is preferable to use a near-infrared absorbing dye having no dye deformation at a high temperature of at least 250 ° C. Moreover, since it is suitable for a display use, it is desirable for the absorption of a near-infrared region to be large and to have a high transmittance of a visible ray region. Therefore, it is preferable to select the pigment | dye with the high transmittance | permeability of visible region from a viewpoint like the above.

Specifically, the near-infrared absorbing dye is preferably a diimmonium salt-based compound, and may be used in combination of one or more other near-infrared absorbing dyes.

It is a matter of course that commercially available products may be used for the diimmonium salt-based compound. For example, CIR-1080, CIR-1081, CIR-1083, CIR-1085, etc., manufactured by Nippon Kalis Corporation, having a thermal decomposition initiation temperature of 270 ° C or higher. It is preferable because there is no problem of losing characteristics upon melting with this plastic resin.

The content of the near-infrared absorbing pigment is preferably included in an amount of 0.0001 to 10 parts by weight based on 100 parts by weight of the engineering plastic resin, when the content is less than 0.0001 parts by weight, there is a problem that the near infrared shielding ability is significantly reduced, more than 20 parts by weight. In this case, there is a problem in that the application of the pigment is impossible because the aggregation phenomenon and overall transmittance of the pigment in the plastic resin are lowered.

The neon light absorbing dye used in the present invention can absorb neon light at 550 ~ 610 nm.

In addition, as the selective wavelength absorbing dye, a color correction dye that absorbs light at 470 to 520 nm can be used. The optical member has a light transmittance characteristic of 10 to 90% in the wavelength range of 550 to 610 nm and 470 to 520 nm.

The neon light absorbing dye may be cyanine-based, polymethine-based, squarylium salt-based, phthalocyanine-based, taphthalocyanine-based, quinone-based, azaporphyrin-based, azo-based, azochelate-based, azurenium-based, pyryllium-based, croconium-based, Pigments, such as an indoaniline chelate system, an indonaphthol chelate system, a dithiol metal complex system, a pyrimethene system, an azomethine system, a xanthene system, or an oxonol system, can be used. In particular, it is preferable to select and use the pigment of the above-mentioned pigments excellent in thermal stability and compatibility with the plastic resin so as not to lose the characteristic of the pigment during mixing and melting with the engineering plastic resin.

The content of the neon light absorbing pigment is preferably included in 0.00001 to 10 parts by weight based on 100 parts by weight of the engineering plastic resin, when the content is less than 0.00001 parts by weight, there is a problem that the ability to absorb neon light does not appear, 10 weight When the amount is exceeded, there is a problem that the pigment aggregation phenomenon and the transmittance are lowered.

The composite functional display optical member of the present invention composed of the above components may include an ultraviolet absorber in addition to the above components, and may further include thermal stabilizers and other additives when the engineering resin is a carbonate-based resin.

It is preferable that the said ultraviolet absorber is 10% or less in transmittance | permeability at 380 nm, More preferably, it is 10% or less in transmittance at 390 nm, Most preferably, it is 10% or less in 400 nm.

The ultraviolet absorber may use both an organic ultraviolet absorber and an inorganic ultraviolet absorbent, and in particular, it is more preferable to use an organic ultraviolet absorbent in view of transparency.

As the organic ultraviolet absorber, any known one commonly used in the art may be used. For example, benzotriazole, benzophenone, or cyclic imino ester may be used alone or in combination of two or more thereof. It is particularly preferable to use a cyclic imino ester in terms of heat resistance.

Preferably, the ultraviolet absorber is included in an amount of 0.00001 to 5 parts by weight based on 100 parts by weight of the engineering plastic resin, and when the content is less than 0.00001 parts by weight, there is a problem in absorbing ultraviolet rays. There is a problem falling.

When explaining the polyester-based optical member as an example of the optical member for composite functional display of the present invention containing the above components as follows.

In general, polyesters used in polyester optical members include esters or transesterification reactions of aromatics and glycols, such as terephthalic acid, isophthalic acid and naphthalenedicarboxylic acid, followed by a polycondensation reaction. This is usually supplied in the form of polymer chips.

That is, in the case of a polyester optical member, the present invention mixes and melts the polymer chip and at least one or more pigments to extrude into a sheet shape from a T die to form an unstretched film. Preferably, the optical member of the film form can be manufactured by the method of extending | stretching in a biaxial direction, then performing a heat setting process, a relaxation process, etc.

As the stretching method, conventional methods such as tubular stretching method, simultaneous biaxial stretching method, and sequential biaxial stretching method can be used, and in particular, in terms of planarity, dimensional stability, and thickness nonuniformity of the resulting film, the sequential biaxial stretching method It is good to carry out.

As a specific example, the optical member for a composite functional display of the present invention can be manufactured by the following method, but the method described below is merely a representative example of the present invention, and the substrate used in the optical member of the present invention is the following method. It is not limited to that produced by.

First, the polyethylene terephthalate resin pellets are sufficiently dried under reduced pressure, and then, the pigments are simultaneously supplied to the extruder together with at least one or more kinds of pellets, and about 280 ° C. Yongwoong PET resin is extruded into a sheet shape for about 30 minutes from a T die, and a rotary cooling roll The sheet-like molten PET resin is cooled and solidified by an electrostatic application method to form an unstretched PET film. The unstretched PET film is stretched 2.5 to 5.0 times in the length direction with a roll heated to 80 to 120 ° C. to form a uniaxially stretched PET film. The end of the uniaxial stretched film is gripped with a clip, guided to a hot air zone heated to 70 to 140 ° C, and stretched 2.5 to 5.0 times in the width direction. Subsequently, the mixture was led to a heat treatment zone at 160 to 240 ° C., followed by heat treatment for 1 to 60 seconds to complete crystallization, thereby obtaining a biaxially stretched PET film having a thickness of 80 to 120 μm.

In addition, polycarbonate sheets for composite functional displays are similarly to the methods described above, and are mixed and melted at a high temperature, especially at 250 ° C. or higher, with a selective wavelength absorbing dye, and then used in a thickness of at least 0.1 mm to 5 mm. Obtained by extrusion, coextrusion or injection as appropriate.

In general, "transparent" of a transparent substrate means that the total light transmittance is 80% or more, preferably 90% or more. The haze of the base material is preferably 5% or less, more preferably 2% or less. When transparency of the said base material falls, sharpness of an image will become bad besides reducing the brightness of a display. At this time, the said total light transmittance and haze are the values measured by the method of JIS-K7136.

Therefore, in the optical member for composite functional display of the present invention obtained as described above, the transmittance at 850 to 1,100 nm is 10% or less, and the transmittance at 550 to 610 nm is 10 to 90%, preferably 10 to 70%. Must be satisfied. In addition, changes over time due to heat, humidity, and light should be small.

In addition, the present invention provides a display filter (PDP, LCD, OLED, Flexible display, etc.) to which the optical member for a composite functional display as described above is applied, wherein the filter dissolves the pigment by heat when melting the engineering plastic resin. In addition to blocking the near-infrared region (900-1200 nm), it is excellent in blocking the neon light in the 550-610 nm region that emits orange light, and at the same time heat, moisture and light resistance compared to the conventional transparent plastic substrate. It is excellent in color purity and brightness, and can be applied to PDP, LCD, OLED, flexible display, etc., which pursues good quality, cost reduction, structure simplification, and complex function.

In addition, the display filter does not use a glass substrate as a base member, but uses the above-described optical member as a base member. The optical member may perform a compound function alone.

That is, the optical member for a composite functional display according to the present invention can be directly attached to a front substrate such as a PDP, and can be used as a base member of other functional layers to form a filter for a display device.

Hereinafter, preferred examples are provided to help understanding of the present invention, but the following examples are merely to illustrate the present invention, and the scope of the present invention is not limited to the following examples.

EXAMPLE

Example  One

CIR 1085 (manufactured by Nippon Calit Corporation), which is a CIR pigment, was added to a differential scanning calorimeter (DSC) to check the durability of the pigment for 30 minutes at a high temperature of 300 ° C. As a result, as shown in FIG. 1, the pigment melted over time at a high temperature of 300 ° C., but it was confirmed that no significant change was observed for 30 minutes.

In addition, in order to check whether the dye can be used after heat treatment, the pigment was left at room temperature and then dispersed in an organic solvent (MEK, MIBK, toluene, etc.). Then, the transmittance was measured using the UV-Vis spectrum (absorption) in the intrinsic wavelength range of the dye. As a result, as shown in Figure 2, even after the 300 ℃ heat treatment, it was confirmed that the transmittance was 10% or less in the 900 ~ 1,200 nm region of the original function.

Example  2

Example 1 was carried out in the same manner as in Example 1, except that TAP-2 (Yamada Chemical), a TAP series pigment, was used in place of CIR 1085.

As a result, as shown in FIGS. 3 and 4, the TAP-based pigments also melted with time at a high temperature of 300 ° C., but did not show a significant change for 30 minutes and absorbed in the 550-610 nm region even after the heat treatment. Could confirm.

Example  3

100 parts by weight of a polyethylene terephthalate resin having an intrinsic viscosity of 0.62 dl / g and 0.001 part by weight of a near-infrared blocking dye of CIR 1085 (made by Alborn Kallet) were added to a twin screw extruder and melt-extruded from T-Dice for 10 seconds at 280 ° C. To give an electrostatic application on a cold rotating metal roll while being adhered and solidified to prepare an unstretched sheet.

The said polyethylene terephthalate thickness was 1-3 mm, the total transmittance of the optical member was 82%, and the average transmittance was 10% or less in the wavelength range of 900-1,200 nm.

Example  4

100 parts by weight of polycarbonate resin and 0.0001 parts by weight of TAP-2 dye were added to a twin screw extruder, mixed and melted at 250 ° C. for 5 seconds to produce a neon light blocking display sheet having a thickness of 0.1 to 5 mm using an extrusion method. It was. The total transmittance of the prepared sheet for neon cut blocking display was 82%, and the transmittance was selectively absorbed at 550 to 610 nm.

Example  5

In Example 4, as well as the neon light blocking pigment and the near-infrared pigment was added at the same time as in Example 4 to prepare a composite functional display sheet. The total transmittance of the optical member for composite functional display was 55%, and as shown in FIG. 5, the transmittance was selectively absorbed at 550 to 610 nm and 900 to 1200 nm.

The optical member for a composite functional display according to the present invention uses a near-infrared dye that can withstand 250 ° C. or higher, and a neon light absorbing dye having excellent compatibility with engineering plastic resins, thereby preventing dissolution of the pigment by heat during melting. -1200 nm) as well as excellent blocking function in the 550-610 nm range that emits orange light, and at the same time, excellent heat resistance, moisture resistance, light resistance, and improved color purity and brightness compared to conventional transparent plastic films. It can be applied to PDP filters, LCDs, OLEDs, and flexible displays that pursue good quality, cost reduction, structure simplification, and complex function.

Although only described in detail with respect to the described embodiments of the present invention, it is apparent to those skilled in the art that various modifications and variations are possible within the technical scope of the present invention, it is obvious that such variations and modifications belong to the appended claims. will be.

Claims (12)

a) engineering plastic resin; b) An optical member for composite functional display having a melting point of at least 200 ° C. and comprising at least one selective wavelength absorbing dye. The method of claim 1, a) 100 parts by weight of engineering plastic resin; And b) 0.00001 to 10 parts by weight of the neon light absorbing dye, the optical member for a composite functional display. The method of claim 1, a) 100 parts by weight of engineering plastic resin; And b) 0.0001 to 10 parts by weight of a near infrared absorbing dye having a melting point of at least 250 ° C. The method of claim 1, a) 100 parts by weight of engineering plastic resin; b) 0.00001 to 10 parts by weight of a neon light absorbing dye; And c) 0.0001 to 10 parts by weight of a near infrared absorbing dye having a melting point of at least 250 ° C. The method of claim 1, The engineering plastic resin is at least one selected from the group consisting of polyester resins, acrylic resins, cellulose resins, polyolefin resins, polyvinyl chloride resins, polycarbonate resins, phenol resins, and urethane resins. The optical member for composite functional displays characterized by the above-mentioned. The method of claim 1, An optical member for a functional composite functional display, wherein the selective wavelength absorbing dye comprises a neon light absorbing dye absorbing neon light at 550 to 610 nm and a color correction dye absorbing light at 470 to 520 nm. The method according to claim 2 or 4, The neon light absorbing pigment is cyanine-based, polymethine-based, squarylium salt-based, phthalocyanine-based, taphthalocyanine-based, quinone-based, azaporphyrin-based, azo-based, azochelate-based, azurenium-based, pyrilium-based, croconium-based, At least one member selected from the group consisting of indoaniline chelates, indonaphthol chelates, dithiol metal complexes, pyrromethenes, azomethines, xanthenes, and oxonols. The method according to claim 3 or 4, The near-infrared absorbing dye is a diimmonium salt compound, the optical member for a composite functional display. The method of claim 1, An optical member for a composite functional display, further comprising 0.0001 to 5 parts by weight of a ultraviolet absorber. The method of claim 1, The optical transmittance of the optical member is 10% or less in the wavelength range of 900 to 1,200 nm, and 10 to 90% in the wavelength range of 550 to 610 nm and 470 to 520 nm. . As a base member of the optical filter for display, a) engineering plastic resin; And b) a display having an optical member consisting of at least two or more selective wavelength absorbing pigments comprising a neon light absorbing dye having a melting point of at least 200 ° C. and blocking the 550-610 nm range, and a near infrared absorbing dye having a melting point of at least 250 ° C. Filter for the device. The method of claim 11, And the display device filter is a PDP filter.

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