KR20130117176A - Display window and display device using the same - Google Patents

Abstract

PURPOSE: A display window is provided to replace the expensive glass used as the existing window material due to the excellent scratch resistance and shock resistance. CONSTITUTION: A display window (100) comprises a matrix resin (2) and a stiffening member impregnated in the matrix resin. The elastic modulus measured by applying MTS alliance RT/5 test frame equipped with 100N load cell is 5x105-5x1010 dyne/cm2 and the pencil hardness is 1B-7H. A hard coating layer of 0.1-5 micron thickness is formed in at least one side of the display window. A display unit comprises a display device and the above display window mounted on the upper part of the display device.

Description

DISPLAY WINDOW AND DISPLAY DEVICE USING THE SAME}

The present invention relates to a display window and a display device using the same. More specifically, the present invention relates to a display window and a display device using the same, which can replace expensive glass used as an existing window material having excellent scratch resistance, hardness, and impact resistance.

Glass has been used for display windows such as liquid crystal display elements and organic EL display elements, that is, cover glass.

However, glass has the disadvantage of being vulnerable to strength and impact. In order to overcome the shortcomings of such glass, recently, gorilla glass (Gorilla Glass) is used as a cover glass by strengthening existing glass. In gorilla glass, potassium ions are ion-exchanged instead of sodium ions in the molten glass, and in this state, a compressive stress strong layer is formed on the glass. However, the gorilla glass, but compensating for the defect that is broken by strengthening the existing glass, there is a problem that increases the cost of the product is quite expensive.

Therefore, there is a need for the development of new materials that can replace expensive gorilla glass with excellent impact and strength and scratch resistance.

It is an object of the present invention to provide a display window that can be used as a cover glass of a display device.

Another object of the present invention is to provide a display window excellent in scratch resistance, hardness and impact resistance.

Still another object of the present invention is to provide a display window which can reduce product cost by not applying expensive gorilla glass.

Still another object of the present invention is to provide a display device using the display window.

One aspect of the invention relates to a display window. The display window includes a matrix resin and a reinforcement impregnated in the matrix resin, the matrix resin having an elastic modulus measured by applying an MTS Alliance RT / 5 test frame with a 100N load cell of 5 x 10 ⁵ to It may be 5 x 10 ¹⁰ dyne / cm2.

The display window may have a pencil hardness of 1B to 7H.

The display window may have a falling ball impact height of 20 cm or more measured by a 30 g weight stainless ball.

The display window may have a transmittance of 90% or more and a Haze of 3% or less.

The display window may have a warpage within ± 0.3 mm at high temperature (85 degrees) and high humidity (85%) evaluation.

The display window may have a thickness of about 10 μm to about 1,000 μm.

The reinforcing material may include one or more from the group consisting of glass fiber, glass fiber cloth, glass fabric, glass nonwoven fabric, uni-directional glass cloth and glass mesh. have.

The matrix resin is epoxy resin, acrylate resin, unsaturated polyester resin, bismaleimide triazine resin, cyanate resin, polyimide resin, polyphenylene oxide resin, polyetherimide resin, fluorocarbon resin , Polyethersulfone resin, polyethylenenaphthalate resin, polyarylate resin, polycarbonate resin, silicone rubber, styrene-butadiene rubber (SBR), butadiene rubber, isoprene rubber, chloroprene, neoprene rubber, ethylene-propylene -Diene terpolymers, styrene-ethylene-butylene-styrene (SEBS) block copolymers, styrene-ethylene-propylene-styrene (SEPS) block copolymers, acrylonitrile-butadiene rubber (NBR), Hydrogenated Nitrile Rubber (HNBR), Fluorinated Rubber, and Plasticized Polyvinyl Chloride (PVC) and the like.

Another aspect of the invention relates to a display device using a display window. In an embodiment the display device comprises a display element; And the display window mounted on the display element.

The present invention can be used as a cover glass of the display device, excellent scratch resistance and hardness and impact resistance, and does not apply expensive gorilla glass to reduce the cost of the product and the invention to provide a display device using the same Has the effect of.

1 is a schematic cross-sectional view of a display window according to one embodiment of the invention.
2 is a schematic cross-sectional view of a display device according to one embodiment of the present invention.
3 is a schematic perspective view of a display device according to one embodiment of the invention.

The display window of the present invention includes a matrix resin and a reinforcing material impregnated in the matrix resin. 1 is a schematic cross-sectional view of a display window according to one embodiment of the invention. As shown, the display window 100 of the present invention includes a matrix resin 2 and a reinforcing material 1 impregnated in the matrix resin.

The matrix resin (2) is epoxy resin, acrylate resin, polyester resin, polyether sulfone resin, polyethylene naphthalate resin, polyarylate resin, polycarbonate resin, polyimide resin, silicone rubber , Styrene-butadiene rubber (SBR), butadiene-based rubber, isoprene-based rubber, chloroprene, neoprene rubber, ethylene-propylene-diene terpolymer, styrene-ethylene-butylene-styrene (SEBS) block copolymer, styrene-ethylene- Propylene-styrene (SEPS) block copolymers, acrylonitrile-butadiene rubber (NBR), hydrogenated nitrile rubber (HNBR), florinated rubber and plasticized poly Vinyl chloride (PVC) and the like. These can be used individually or in mixture of 2 or more types. Among them, preferred are silicone or epoxy resins. As the silicone rubber, an organopolysiloxane having an average degree of polymerization of 5 to 2000 may be used. Examples of the organopolysiloxane include polydimethylsiloxane, polymethylphenylsiloxane, polyalkylarylsiloxane, polyalkylalkylsiloxane, and the like. These are three-dimensional molecules of the network structure. Preferably, the number of the network bonding points (crosslinking points) is one for each of 5 to 500 R 2 SiO. Preferably, the organopolysiloxane having a viscosity of 5 Cst to 500,000 Cst may be applied. It is excellent in flexibility and rigidity in the said range. Preferably 50 to 120,000 Cst, more preferably 100 to 100,000 Cst, and most preferably 1000 to 80,000 Cst.

In an embodiment, the matrix resin may have an elastic modulus of 25 ° C. and 5 × 10 ⁵ to 5 × 10 ¹⁰ dyne / cm 2. Within this range, flex resistance, flexibility, and rigidity can be secured and used as a cover glass of the display device. Preferably it may be 1 x 10 ⁷ ~ 1 x 10 ¹⁰ dyne / cm2. More preferably, it is 2x10 <^7> -9 * 10 <^9> dyne / cm <2>. The modulus of elasticity is measured at 25 ° C. using an MTS Alliance RT / 5 test frame with a 100N load cell.

The matrix resin 2 may have a glass transition temperature of -150 to 450 ° C. Preferably -130-400 ° C, more preferably -130-350 ° C. It is excellent in flexibility and rigidity in the said range. In embodiments it may be -100 to -10 ℃.

Preferably, the matrix resin 2 may include a two-component polyorganosiloxane, an epoxy, or a combination thereof. In the case of the two-component polyorganosiloxane, the impregnation of the reinforcing material is easy, and the productivity of the display window can be improved by a short curing time by hydrosilylation.

The polyorganosiloxane may include a compound represented by Formula 1 below.

[Formula 1]

 (Wherein R and R 'are the same as or different from each other, a hydrogen atom, a substituted or unsubstituted C1-C20 alkyl group, a substituted or unsubstituted C2-C20 alkenyl group, a substituted or unsubstituted C2-C20 alkynyl group, Substituted or unsubstituted C1-C20 alkoxy group, substituted or unsubstituted C3-C30 cycloalkyl group, substituted or unsubstituted C3-C30 cycloalkenyl group, substituted or unsubstituted C3-C30 cycloalkynyl group, substituted or unsubstituted C6-C30 aryl group, substituted or unsubstituted C6-C30 aryloxy group, s may be an integer from 2 to 1000)

The matrix resin may be formed from a polyorganosiloxane of linear structure. From this, it is easy to impregnate the reinforcement, prevent the generation of bubbles in the display window, it is possible to prevent the occurrence of cracks at the interface with the reinforcement. In addition, it is possible to improve the flexibility, heat resistance and dimensional stability by showing the physical properties of the silicone rubber.

The matrix resin may be formed from polyorganosiloxanes having different refractive indices. By controlling the ratio of polyorganosiloxanes having different refractive indices, it is possible to minimize the difference in refractive index with the reinforcing material, so that the difference in refractive index between the matrix and the reinforcing material may be 0.01 or less.

The matrix resin may be included in 5-95% by weight of the display window. Within this range, flexibility and rigidity can be maintained. Preferably it may be included in 25-65% by weight.

The reinforcing material 1 is at least one selected from the group consisting of glass fibers, glass fiber cloth, glass fabric, uni-directional glass filament, glass nonwoven fabric, and glass mesh. It may include.

The refractive index of the reinforcing material 1 may be 1.45 to 1.65. Preferably 1.46 to 1.57.

The reinforcement 1 may have a refractive index difference of 0.01 or less from the matrix resin 2. Within this range, it can be used as a cover glass of the display device by providing excellent transparency and light transmittance. Preferably, the refractive index difference may be 0.0001 to 0.007.

In addition, the reinforcing material has a density of 2.0 to 3.0g / ㎠, elastic modulus of 5 x 10 ⁹ to 8 x 10 ¹⁰ dyne / cm 2 It may be preferably applied.

The reinforcing material may have a thickness of 10 μm to 1,000 μm. The reinforcement may be included in 5 to 95% by weight of the display window. Within this range, flexibility and rigidity can be maintained. Preferably it may be included in 35 to 75% by weight.

The display window can be manufactured by conventional methods. For example, it can be produced by impregnating and curing the reinforcing material in the matrix resin. Curing may be performed in a thermosetting manner, but is not limited thereto.

The hard coating layer may be coated on at least one surface of the display window to increase the strength of the surface.

The hard coating layer may be coated on at least one surface of the fiber reinforced film. In embodiments, the hard coating layer may have a thickness of 0.1-5 μm.

As the material of the hard coating layer, a thermosetting resin or a photocurable resin may be used. Urethane acrylates, epoxy acrylates, polyether acrylates, polyester acrylates having, for example, polyfunctional groups; Organic-inorganic hybrids; Silicones based on polydimethylsiloxane can be used, and combinations thereof are also possible. The organic-inorganic hybrid may be used an organic-inorganic hybrid that utilizes Silicate or alcohol group Silane.

In addition, the display window may further include an anti-reflective coating, an anti-glare, an anti-finger print, or the like.

The display window 100 may have a thickness of 10 μm to 1,000 μm.

The display window has an elastic modulus of 5 x 10 ⁵ to 5 x 10 ¹⁰ measured using an MTS Alliance RT / 5 test frame with 100 N load cells. dyne / cm 2, preferably 1 × 10 ⁷ to 1 × 10 ¹⁰ dyne / cm 2, more preferably 2 × 10 ⁷ to 9 × 10 ⁹ dyne / cm 2.

The display window may have a pencil hardness of 1B to 7H, preferably 4H to 7H, measured using a pencil hardness tester.

The display window may have a falling impact height measured by a method of dropping a stainless steel ball of 20 cm or more, preferably 20 to 150 cm, more preferably 25 to 120 cm.

The display window may have a transmittance of 90% or more, for example, 91% to 99%. In addition, Haze may be 3% or less, preferably 0.01 to 2%, more preferably 0.01 to 1%.

The display window may have a warpage within ± 0.3 mm during high temperature and high humidity evaluation.

Another aspect of the invention relates to a display device using a display window. 5 is a schematic cross-sectional view of a display device according to an embodiment of the present invention. As shown, the display device of the present invention includes a display element 200; And a display window 100. The display window 100 of the present invention is mounted on the display element 200.

In addition, a touch panel or a decoration layer may be further formed between the display element 200 and the display window 100. 6 is a schematic perspective view of a display device according to an embodiment of the present invention. As illustrated, the display device of the present invention may have a display window 100 formed on the outermost surface, and the frame 300 may be formed to fix the display window 100 and the display element 200 therein. have.

Hereinafter, the configuration and operation of the present invention through the preferred embodiment of the present invention will be described in more detail. It is to be understood, however, that the same is by way of illustration and example only and is not to be construed in a limiting sense.

Details that are not described herein will be omitted since those skilled in the art can sufficiently infer technically.

Example  One

168.3 g of polyorganosiloxane (A1) and 31.42 g of (A2) were mixed ((A1): 84.29 wt%, (A2): 15.71 wt%), and 100 ppm of hydrosilylation reaction catalyst was added to prepare a composition for a matrix. It was. 70 g of glass fiber cloth was first impregnated into 70 g of the composition for preparing a matrix, and maintained at 25 ° C. for 1 minute. Primary curing at 150 ° C. for 15 minutes. Secondary impregnation and hardening were carried out in the same manner as the first impregnation and hardening, and a composite film was prepared. This formed composite film (thickness: 100 μm) was prepared.

Example  2

A composite film was prepared in a similar manner as in Example 1. The used material was coated on one surface of the composite film by applying an Acryl-based resin by a slot die method, thereby preparing a composite film (thickness: 100 μm) having a hard coating layer having a thickness of 3 μm.

Comparative Example  One

The glass cover glass (SYNEX GLASS, NEOSYS) (thickness: 0.7 mm) used as the window material of the existing display device was evaluated.

Comparative Example  2

A polycarbonate was melted by a main extruder using a feedblock type coextruder, and polymethyl methacrylate was melted by a coextruder to prepare a composite film having a two-layer structure having a thickness of 0.5 mm. Both surfaces of the coating material were coated with a slot die method by applying an acryl-based resin to prepare a composite film having a hard coating layer having a thickness of 3 μm.

The physical properties of the display windows manufactured in Examples 1 and 2 and Comparative Examples 1 and 2 were evaluated by the following methods, and are shown in Table 1 below.

Property evaluation method

(1) Flex resistance: The flex resistance of the composite film or glass through the reciprocating motion of the moving shaft was measured. When the sample of 2cmx7cm size and 100㎛ thickness is folded in 10,000 round trips under the condition of 1 bending / cycle from 15mm interval, the interval of whitening phenomenon is measured.

(2) Pencil hardness: Using a pencil hardness tester (Shinto Scientific, Heidon) with a Mitsubishi evaluation pencil (UNI) at 500kg / cm ² load, 0.5mm / sec speed, and then check the pencil hardness.

(3) Impact resistance: When a 30g weight stainless steel ball (diameter 20mm) falls on the composite film, the ball mark does not form and does not break.

(4) Elastic Modulus: The elastic modulus of the matrix was measured at 25 ° C. using an MTS Alliance RT / 5 test frame with 100 N load cells. The specimens were weighted with two air grips spaced 25 mm apart and pulled at a crosshead speed of 1 mm / min. Load and displacement data were collected continuously and the maximum slope of the initial portion of the load displacement curve was taken as Young's modulus.

(5) Warpage: The height of the four corners at the bottom when the composite film of 100mm x 100mm size and 100㎛ thickness is placed on a uniform surface at 30 ℃ at high temperature (85 degrees) and high humidity (85%). Measure the highest height.

(6) Linear expansion coefficient: It was measured by the thermomechanical analyzer TMA (thermomechanical analysis) based on ASTM D696 at a temperature rising rate of 10 ° C. per minute under a stress of 5 gf.

(7) Glass Transition Temperature: Thermomechanical Analyzer DSC (differential scanning calorimeter, TA instruments, Q100) was used to measure the temperature increase rate of 10 ℃ per minute.

(8) Haze: It measured using the haze meter (Nippon denshouku company, NDH200).

Flex resistance (mm) pencil
Hardness
(H) Impact resistance (cm) Shout
Modulus
(10 ⁶ dyne / cm ² ) curling
(mm) Linear expansion
Coefficient
(ppm / DEG C) Glass
transition
Temperature
(℃) Hayes
(%) Example 1 3 4H 30 50 2 4 -30 3 Example 2 5 7H 50 50 7 10 -30 3 Comparative Example 1 100 8H 10 70,000 5 5 - <3 Comparative Example 2 50 4H 10 500 Fail 40 50 <3

As shown in Table 1, in the case of Example 1 it can be seen that the excellent bending resistance and impact resistance compared to Comparative Example 1 and excellent in bending resistance, curling, linear expansion coefficient, glass transition temperature and the like compared to Comparative Example 2.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the embodiments described above are in all respects illustrative and not restrictive.

1: reinforcing material 2: matrix resin
100: display window 200: display element
300: frame

Claims (12)

A matrix resin and a reinforcing material impregnated in the matrix resin,
Display window with an elastic modulus of 5 x 10 ⁵ to 5 x 10 ¹⁰ dyne / cm2 measured using the MTS Alliance RT / 5 test frame with 100 N load cell.
The display window of claim 1, wherein the display window has a pencil hardness of 1B to 7H.
The display window of claim 1, wherein a hard coating layer having a thickness of about 0.1 μm to about 5 μm is formed on at least one surface of the display window.
The method of claim 1, wherein the hard coating layer is a polyfunctional urethane acrylate, epoxy acrylate, polyether acrylate, polyester acrylate; Organic-inorganic hybrids; A display window, wherein the display window is one or more materials selected from the group consisting of silicone based polydimethylsiloxanes.
The display window of claim 1, wherein the display window has a falling ball impact height of 20 cm or more measured by a 30 g weight stainless ball.
The display window of claim 1, wherein the display window has a thickness of 10 μm to 1,000 μm.
The display window of claim 1, wherein the display window has a transmittance of 90% or more and a Haze of 3% or less.
The display window of claim 1, wherein the display window has a warpage within ± 0.3 mm at high temperature (85 degrees) and high humidity (85%) evaluation.
The method of claim 1 wherein the reinforcing material is from the group consisting of glass fibers, glass fiber cloth, glass fabric, uni-directional glass cloth, glass nonwoven fabric and glass mesh Display window comprising at least one.
The method of claim 1, wherein the matrix resin is epoxy resin, acrylate resin, unsaturated polyester resin, bismaleimide triazine resin, cyanate resin, polyimide resin, polyphenylene oxide resin, polyether Mid resin, fluorocarbon resin, polyether sulfone resin, polyethylene naphthalate resin, polyarylate resin, polycarbonate resin, silicone rubber, styrene-butadiene rubber (SBR), butadiene rubber, isoprene rubber, chloroprene, Neoprene rubber, ethylene-propylene-diene terpolymer, styrene-ethylene-butylene-styrene (SEBS) block copolymer, styrene-ethylene-propylene-styrene (SEPS) block copolymer, acrylonitrile-butadiene rubber (Acrylonitrile- butadiene Rubber (NBR), Hydrogenated Nitrile Rubber (HNBR), Fluorinated Rubber and A display window comprising at least one of digested polyvinylchloride (PVC).
The display window of claim 1, wherein the reinforcement has a density of 2.0 to 3.0 g / cm 3 and an elastic modulus of 5 × 10 ⁹ to 8 × 10 ¹⁰ dyne / cm 2.
Display elements; And
A display window according to any one of claims 1 to 11 mounted on the display element;
.

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