KR20140055380A - Lcd protection of portable information devices using industrial sapphire window manufacturing method - Google Patents

Abstract

The present invention relates to a method for manufacturing a liquid crystal protection window of a portable information device using industrial sapphire. The methods comprises a first step of growing sapphire with sapphire fire or sapphire ribbon; a second step of processing sapphire to a sapphire ingot or a sapphire plate; a third step of processing the sapphire ingot or the sapphire plate to have a shape corresponding to a size of liquid crystal to be protected to manufacture a window; a fourth step of rounding, chamfering, and puncturing the edges of the window; a fifth step of mirror-surface-machining and annealing the window; a sixth step of anti-reflection (AR) coating a surface of the window; a seventh step of attaching an adhesive material and a resin tape to a lower surface of the window; and an eighth step of inspecting an outer appearance of the window, carving a serial number. in the window according to manufacturing order and packaging the window. In the present invention, after industrial sapphire is grown, the sapphire is processed to obtain a window having a small thickness and a shape corresponding to liquid crystal of a portable information device, and the window is mirror-surface-machined and annealed to improve strength, hardness, and transparency, and AR-coated to have high transmittance, anti-fingerprint characteristics, a UV-proof effect and anti-reflection, anti-bacterial effect, an anti-scattering effect, elimination of moiré, and a function of a security filter. In addition, an adhesive material is applied to a lower surface of the window to detachably attach the window to liquid crystal of a portable information device, thereby enhancing consumer satisfaction by improving consumer reliability and quality of a product.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method for manufacturing a liquid crystal protection window for portable information devices using industrial sapphire,

The present invention relates to a method of manufacturing a liquid crystal protection window of a portable information device using industrial sapphire, and more particularly, to a method of manufacturing a liquid crystal protection window using industrial sapphire, And a method of manufacturing a liquid crystal protection window of a portable information device using industrial sapphire that can be protected from heat.

In general, sapphire is understood to be a type of precious metal such as diamond and used as a gem. However, Synthetic Sapphire, which was produced in the early 20th century, is used as a major material in engineering and optical fields.

In this artificial sapphire, mono crystal sapphire refers to a material obtained by solidifying a high purity alumina (Al 2 O 3) powder into a single crystal structure by melting at a high temperature.

This industrial sapphire is distinguished from sapphire of natural state and is applied variously by using the inherent physical properties of the material itself. Sapphire has high hardness (Mohs hardness 9) next to diamond and easily chemical affinity reaction Stable properties that do not cause cracking, and physical properties with a high melting point.

Especially, this industrial sapphire is one of the hardest solid minerals, exhibiting high transmittance from ultraviolet to infrared, high thermal conductivity at low temperature, and very low dielectric loss to microwave frequency range.

In industrial applications, industrial sapphire is sometimes referred to as Luco sapphire and milk sapphire. Aluminum oxide monocrystalline milk sapphire has a high melting point, resistance to breakage, toughness against aggressive and corrosive media, high strength, low coefficient of friction Also have optical transparency, radiant heat toughness, and high sound insulation covering a wide wavelength range.

In particular, since the late 1990s, the application range has spread to various industrial fields. In recent years, LED BLU (Backlight Unit) business using sapphire substrate has flourished and mass production of sapphire ingots has become a base. ETCHING equipment, MOCVD equipment, and other sapphire materials for industrial use are widely used in the wafer industry.

The characteristics of such industrial sapphire can be utilized as a multifunctional material, and it is possible to grow the material easily, to have high cost efficiency, to grow with low energy consumption, to produce large diameter, , It has strong physical properties against corrosion and radiation and has a long life.

It is suitable for medical field and it is applied to materials optimized for LED, TV, Projector, Microwave device, etc. It is applied as the most suitable material for civil and military windows, bearing or shaft, and it is applied to jewelries by precision processing.

On the other hand, such industrial sapphire has already been proposed as a prior art to which a portable information device is applied by the domestic patent application No. 10-2010-0095109 "Key structure using reinforced glass and keypad manufacturing method" And a keypad composed of a plurality of dome switches electrically connected to the upper surface of the printed circuit board and a key button made of synthetic sapphire material and pressed in correspondence with the dome switch.

The method of forming a keypad according to the present invention includes the steps of flattening a thin plate glass, cutting, cutting and polishing the glass, and processing at least one number or letter on a part of the cut glass plate , Heat treating the processed glass plate, and printing or depositing the processed number or letter.

However, the keypad using the synthetic sapphire as described above may be applicable to keypads that have low transparency and low strength and do not require a clear transparency. However, since clear sharpness like a liquid crystal of a portable information device is required, external shocks, scratches, There is a problem in that it is not suitable as a liquid crystal protection window which can protect from heat.

DISCLOSURE Technical Problem Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a window structure using industrial sapphire and detachably attaching the window to a liquid crystal display of a portable information device, thereby safely protecting the liquid crystal from external scratches or impacts. And a method of manufacturing a liquid crystal protection window of a portable information device using industrial sapphire that can improve sharpness due to an improved transmittance.

According to a preferred embodiment of the present invention, there is provided a method of manufacturing a liquid crystal protection window of a portable information device using industrial sapphire,

A first step in which sapphire is grown with sapphire or a sapphire ribbon; A second step in which edges or defects of the grown sapphire or sapphire ribbon are removed and processed into a sapphire ingot or sapphire plate; A third step of processing the outer shape of the sapphire ingot or the sapphire plate in a shape corresponding to the size of the liquid crystal to be protected and fabricating the sapphire ingot or sapphire plate as a window with a thickness of 0.6 mm to 0.8 mm; A fourth step in which the edge of the window is rounded, chamfered, and hole-processed, and the thickness is processed to 0.4 mm to 0.5 mm; A sixth step of AR coating the surface of the window; A seventh step in which a resin tape for protecting the applied adhesive material is applied after the adhesive material is applied to the bottom surface of the window; Inspecting the appearance of the window, and marking the serial number on the bottom of the window in accordance with the production order.

Preferably, the growth of the sapphire or sapphire ribbon is related to growing the alumina (Al2O3) powder having a purity of 4N (99.99%) or more in the greenhouse and fusing it in an electric furnace at 2200 DEG C or higher.

More preferably, mirror surface machining and annealing of the window are associated with lapping, annealing, polishing and annealing being performed sequentially.

More preferably, the annealing of the window involves annealing at 1400 DEG C for 3 hours.

More preferably, the AR coating of the window surface is associated with the coating material being coated in a vacuum chamber in a vapor deposition manner.

The present invention relates to a method for manufacturing a sapphire sapphire substrate by growing a sapphire for industrial use, processing a window with a shape corresponding to a liquid crystal of a portable information apparatus and a thin thickness, improving strength, hardness and transparency through mirror surface processing and annealing, It is possible to provide a function of preventing fingerprints and preventing UV rays, preventing reflection, preventing bacteria, scattering, improvement of moiré phenomenon and security filter, and applying adhesive material to the bottom surface and detachably attaching to liquid crystal of portable information equipment. It is possible to further improve the consumer's satisfaction with the improvement of the consumer's reliability and the quality of the product.

1 is a flowchart illustrating a method of manufacturing a liquid crystal protection window of a portable information device using industrial sapphire according to the present invention.
FIG. 2 is a state diagram illustrating a process of improving the surface state according to an operating temperature during annealing of a window according to the present invention.
FIG. 3 is a graph showing an increase in bending pressure strength during annealing of a window according to the present invention.
4 is a graph showing a state in which the surface roughness is improved in an annealing process of a window according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

It will be understood by those of ordinary skill in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

In addition, the sizes and shapes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation, and the terms defined specifically in consideration of the configuration and operation of the present invention may vary depending on the intention or custom of the user, operator And the definitions of these terms should be based on the contents throughout this specification.

First, a method of manufacturing a liquid crystal protection window of a portable information device using industrial sapphire according to the present invention will be described in a step-by-step manner.

A first step (S1) of growing industrial sapphire;

This is the step of growing sapphire boules in the form of cylinders or sapphire ribbons in the form of plates and such sapphire growth is controlled by the pressure gradient according to the combination of the phase components of the initial components and growth process conditions Crystal growth in a gaseous state, crystal growth in a solution using a concentration gradient on a crystal solution interface, crystal growth in a melted state using a temperature gradient, and crystal growth in a solid state.

In this case, in the case of crystal growth in the melted state, since a crystal of a large size can be obtained from a grower at a relatively good growth rate, the phase transformation in the melted state is the simplest crystal growth method and the process is controlled at the best You can.

Various methods can be used as the crystal growing method in the fused state. For example, the Bernoulli method, the Czochralski method, which is a so-called extrusion method, the EFG (edge method) the Bridgman method, the Heat Exchange Method (HEM), and the Kyropolus method (Stepanov method), which are known as the horizontal growth method, the -defined film-fed growth method and the Stepanov method, method) and the like.

In the present invention, an alumina (Al2O3) powder having a purity of 4N (99.99%) or more is put in a grower for growing industrial sapphire and melted in an electric furnace of 2200 DEG C or higher. The sapphire fire is coked by a Czochralski method, And the sapphire ribbons were grown by EFG method after 48 hours of growth time.

In this case, the grade is optical grade, the growth axis is C axis or A axis, and the surface state is As-grown state.

A second step (S2) of processing into a sapphire ingot or sapphire plate;

This is because the edge of the sapphire ribbon or the sapphire ribbon grown by the first step (S1) or the portion where the defect is generated is removed and processed with a diamond drill for the convenience of processing so that the ribbon of sapphire or sapphire is fixed to a sapphire ingot or sapphire plate .

A third step (S3) of processing into a window;

This is because the sapphire ingot or the sapphire plate produced through the second step S2 is cut into a square shape using a diamond wheel cutter, and the length and the length of the sapphire ingot or the sapphire plate are determined in accordance with the horizontal and vertical lengths of the liquid crystal display For example, in the case of the iPhone 4, a width of 57 mm and a length of 115 mm are processed.

The thickness is made 0.6 mm to 0.8 mm by using a diamond wire saw. The thickness is preferably 0.7 mm. When the thickness is 0.6 mm or less, the strength is weakened It is difficult to process it, and when it is 0.8 mm or more, the transparency and reaction with the liquid crystal may be lowered.

At this time, the window surface state is the As-cut state.

A fourth step (S4) of processing the rim and holes of the window;

In the third step S3, the four corners of a window having a predetermined length and a length of 0.7 mm are round-cut using a diamond wheel cutter. The sharp edges are smoothly processed through chamfering And holes are formed on the surface of the window by using a diamond drill or a laser cutter so that the function buttons formed on the liquid crystal of the portable information device can be operated directly.

A fifth step S5 of processing the surface of the window;

In the fourth step S4, the rim and hole are processed to make the surface of the processed window transparent, to improve the hardness and strength, and to improve the flatness. The processing order is a lapping machine Annealing process, polishing process using a polishing machine, and annealing process. In this process, both sides of the window are cut, A window having a thickness of 0.6 mm to 0.8 mm is machined to a thickness of 0.4 mm to 0.5 mm.

Here, annealing is a heat treatment in which sapphire crystal is exposed to a specified temperature or higher for a specified period of time and annealed at an appropriate rate to reduce the defects inherent in the single crystal, thereby improving the quality of single crystal parameters , Improve the volume quality of crystals, and improve the quality of subsurface layers.

According to the present invention, annealing a window obtained through the fourth step (S4) at 1400 DEG C or higher for 3 hours by the annealing process improves the surface roughness of the surface and increases the bending pressure of the surface And can be effectively protected from external impact, and the flatness before machining is improved and the fracture toughness is increased by 30%.

As shown in FIG. 2, the surface state (potential and impurity) is gradually improved as a phase graph of the surface of the substrate according to the annealing process temperature. The conditions are 2 μm × 2 μm AFM images of c-plane sapphire substrate (B) is an annealed state at a temperature of 1000 ° C, (c) is an annealed state at a temperature of 1200 ° C, (d) is an annealed state at a temperature of 1400 ° C (ZnO nanostructures). The annealing process is carried out at a temperature of about < RTI ID = 0.0 >

3 is a graph showing that the bending pressure strength is increased when annealing at 1700 ° C or higher, and FIG. 4 is a graph showing that the surface roughness is improved when annealing at 1700 ° C or higher will be.

Here, the fourth step S4 of processing the rim and holes of the window and the fifth step S5 of machining the surface of the window may be performed in the fifth step S5 after the fourth step S4, The fifth step S5 may be performed first and then the fourth step S4 may be performed.

A sixth step (S6) of coating the surface of the window;

Anti-reflection coating is an anti-reflection coating. It can be coated by dry coating method or wet coating method. It is sprayed with adhesion strengthening layer (SiO2, TiO2) so that the coating liquid and glass are well adhered by a dry coating method, The coating material can be coated in the form of a thin film by a deposition method in a chamber, and the transmittance of the industrial sapphire is higher than 80% in the visible light band, and the transmittance of the visible light band wavelength (300 to 700um) To 90% or more.

Here, the AR coating may be coated by the dry coating method described above, but may be replaced with a wet coating method to reduce the production cost.

In coating the window surface, an anti-glare coating for preventing glare in addition to the AR coating described above, and an anti-finger coating for preventing the fingerprints from adhering to the surface may be separately or compounded May be coated.

Accordingly, the window can have a transmittance of 90% or more, a fingerprint prevention effect, a UV ultraviolet blocking effect, an antireflection effect, an antibacterial effect, a scattering prevention effect, a security filter effect, It is possible to improve Moire phenomenon in which repeated patterns overlap each other.

A seventh step (S7) of attaching an adhesive material and a resin tape to the bottom surface of the window;

In order to easily attach and detach a window to a liquid crystal of a portable information device, a thin adhesive tape is applied to the bottom surface of the window, and a resin tape is attached to the back surface of the adhesive tape so as to prevent foreign matter .

Preferably, the adhesive material uses silicon and acryl. For example, silicon may be coated on one side of the double-sided tape and acrylic may be coated on the opposite side.

An eighth step (S8) of inspecting the window top and inserting the serial number and inserting it;

It examines the appearance of windows such as scratches and dirt on the surface of windows, the state of application of the adhesive material on the bottom of the window and the adhesion state of the resin tape, and stamps the serial number according to the order of production in the windows that pass the inspection. And it is possible to increase the value of the product by recognizing it as an expensive product. In this way, the window in which the serial number is stamped is completed through the packaging step.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the scope of the present invention should not be limited by the described embodiments, but should be defined by the appended claims and equivalents thereof.

S1: First step of growing industrial sapphire
S2: Second step of sapphire ingot or sapphire plate
S3: Third step to window
S4: Fourth step of machining window borders and holes
S5: Step 5 of machining the window surface
S6: Step 6 of coating the window surface
S7: Step 7 of attaching adhesive material and resin tape to the bottom of window
S8: Window inspection and serial number imprinting and packaging step 8

Claims (7)

A method for manufacturing a liquid crystal protection window of a portable information device using industrial sapphire,
A first step in which sapphire is grown with sapphire or sapphire ribbon;
A second step in which edges or defects of the grown sapphire or sapphire ribbon are removed and processed into a sapphire ingot or sapphire plate;
Wherein the sapphire ingot or the sapphire plate is processed in a shape corresponding to the size of the liquid crystal to be protected, the thickness of the sapphire ingot or the sapphire plate is 0.6 to 0.8 mm,
A fourth step in which the rim of the window is rounded, chamfered and hole-processed;
A fifth step in which the window is mirror-finished and annealed;
A sixth step of coating a surface of the window;
A seventh step in which a resin tape for protecting the applied adhesive material is applied after the adhesive material is applied to the bottom surface of the window;
An eighth step of inspecting the outer shape of the window and marking the serial number on the bottom of the window according to the production order;
Wherein the sapphire substrate is a sapphire sapphire substrate.
The method according to claim 1,
Wherein the growth of the sapphire bulb or the sapphire ribbon is performed by inserting alumina (Al 2 O 3) powder having a purity of 4N (99.99%) or more into the growth chamber and fusing it in an electric furnace at 2200 ° C or higher. A method of manufacturing a window.
The method according to claim 1,
Wherein the mirror surface processing and the annealing processing of the window are sequentially performed by lapping, annealing, polishing, and annealing.
The method according to claim 1 or 3,
Wherein the annealing process of the window is annealed at 1400 ° C for 3 hours.
The method according to claim 1,
Wherein the coating of the window surface is coated by a dry coating method or a wet coating method in which a coating material is coated by a vapor deposition method in a vacuum chamber.
6. The method according to claim 1 or 5,
Wherein the window surface is coated with one of an anti-reflection coating, an anti-glare coating, and an anti-finger coating. A method of manufacturing a liquid crystal protection window of a device.
6. The method according to claim 1 or 5,
Wherein the coating of the window surface is applied together with anti-reflection coating and anti-finger coating. ≪ RTI ID = 0.0 > 15. < / RTI >

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