KR101966336B1 - Touch panel and organic light emitting diode display comprising the same - Google Patents

Abstract

The present invention relates to a touch panel and an organic light emitting display including the touch panel, and more particularly, to a touch panel including a touch panel having a touch sensor formed on one surface of a? / 4 retardation layer and a barrier layer formed on the other surface thereof, And more particularly, to a touch panel and an organic light emitting display including the touch panel.

Description

TECHNICAL FIELD [0001] The present invention relates to a touch panel and an organic light emitting display including the touch panel.

The present invention relates to a touch panel having improved flexibility and an organic light emitting display including the same.

Until recently, CRT (cathode ray tube) was mainly used as a display device. However, recently, flat panel display devices such as a plasma display panel (PDP), a liquid crystal display (LCD), and an organic light emitting diode (OLED) display capable of replacing a CRT have been widely studied and used.

Since the organic light emitting device of the dual organic light emitting diode display device is a self light emitting device, a backlight used in a liquid crystal display device which is a non-light emitting device is not required, so that it can be light and thin.

In addition, it has a better viewing angle and contrast ratio than the liquid crystal display device, is advantageous from the viewpoint of power consumption, can be driven by DC low voltage, has a fast response speed and is resistant to external shocks . Therefore, OLEDs are widely used in personal mobile phones, PDAs or notebooks.

Meanwhile, in recent years, a touch panel type OLED having a touch panel having the advantage of being able to input letters and pictures more easily and precisely has been widely used in an electronic notebook or personal information processing apparatus.

The touch panel type OLED is formed by separately forming the touch panel and the OLED panel, and then attaching them.

The touch panel is composed of an upper film formed with an upper electrode, a lower film formed with a lower electrode, and a gap formed between the upper film and the lower film so as to have a predetermined space therebetween.

In addition, the OLED panel comprises a switching element, an organic light emitting diode, a protective layer (barrier layer) for encapsulation, and a protective film for protecting the protective layer from the outside on the substrate.

Due to the above-described structure, the entire thickness of the touch panel type OLED becomes thick, which results in a decrease in flexibility, transmittance and color tone. In addition, there is a problem that the process cost is increased and the efficiency of the process is lowered.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a touch panel that is improved in flexibility by being lightweight and thin.

It is another object of the present invention to provide an organic light emitting display device including the touch panel and having improved reliability and process efficiency.

In order to achieve the above object, the present invention provides a touch panel in which a touch sensor is formed on one surface of a lambda / 4 retardation layer and a barrier layer is formed on another surface.

The touch sensor may be of a capacitive type.

The barrier layer may be formed by Plasma Enhanced Chemical Vapor Deposition.

Further, the present invention provides an organic light emitting diode display including the touch panel.

The touch panel may include a polarizer on the touch sensor.

A cover glass or a cover film may be laminated on the polarizer.

The cover glass or cover film may be formed with a functional layer selected from the group consisting of antifouling property, anti-fingerprint property, antistatic property, hard coat property and antireflection property.

Since the organic light emitting display device of the present invention does not use a base film and a polarizer protective film for forming a touch sensor, the organic light emitting display device has advantages such as thinness, lightness and flexibility.

In addition, the organic light emitting display device of the present invention has an advantage that the process cost is reduced and the efficiency of the process is improved.

In addition, the organic light emitting display device of the present invention has an advantage of improving outdoor visibility by forming circularly polarized light under the cover glass or the cover film.

1 is a vertical sectional view of a touch panel according to the present invention,
2 is a vertical sectional view of an OLED display device including a touch panel according to the present invention.

The present invention relates to a touch panel having improved flexibility and an organic light emitting display including the same.

Hereinafter, the present invention will be described in detail.

A touch sensor 20 is formed on one surface of the? / 4 retardation layer 10 of the present invention, and a barrier layer 30 is formed on the other surface of the? / 4 retardation layer 10 (FIG. 1).

The? / 4 retardation layer 10 is a film that retards the phase by a quarter wavelength with respect to the incident light?.

The? / 4 retardation layer may be a? / 4 liquid crystal coating layer by liquid crystal coating or a? / 4 retardation film by stretching the film.

The liquid crystal coating layer can be produced using a liquid crystal compound having optical anisotropy and having crosslinkability by light or heat. The liquid crystal compound may include, for example, a reactive liquid crystal compound (RM). Examples of the reactive liquid crystal compound (RM) include those described in Information Display Vol. 10, No. 1 (Recent Research Trend of Reactive Liquid Crystal Monomer (RM)).

The reactive liquid crystal compound refers to a monomer molecule having a liquid crystal phase including a mesogen capable of exhibiting liquid crystallinity and an end group capable of polymerization. When the reactive liquid crystal compound is polymerized, a crosslinked polymer network can be obtained while maintaining the aligned phase of the liquid crystal. When a reactive liquid crystal compound molecule is cooled from a clearing point, a domain having a well-oriented structure with a relatively low viscosity on a liquid crystal can be obtained, as compared with the case of using a liquid crystal polymer having the same structure.

The thus formed? / 4 liquid crystal coating layer is mechanically and thermally stable since it has a solid thin film form while maintaining the optical anisotropy and dielectric constant of the liquid crystal.

The? / 4 liquid crystal coating layer can be formed by coating a liquid crystal coating composition containing a reactive liquid crystal compound (RM) on a substrate, and irradiating polarized ultraviolet rays, polarized electromagnetic waves, etc.

The? / 4 film layer is preferably formed by a solution casting method or an extrusion molding method and stretched. The stretching may be an all-axis stretching process in which the film is stretched in a mechanical flow direction; Transverse uniaxial stretching (e.g., tenter stretching) in which stretching is performed in a direction orthogonal to the mechanical flow direction; Biaxial stretching in which longitudinal and transverse stretching are performed at the same time, and preferably an obliquely stretched film is applied.

In the present invention, the touch sensor 20 is formed on one surface of the? / 4 retardation layer 10. The touch sensor 20 is preferably a capacitance type sensing a change in capacitance generated in a plurality of X electrodes and a plurality of Y electrodes formed so as to cross each other and judging whether or not the corresponding part is in contact.

Such a touch sensor may be a hexagonal, diamond-like, or other polygonal shape, in which a first electrode and a second electrode are arranged in a crossing manner in a method commonly used in the art.

The barrier layer 30 is formed on the other surface of the? / 4 retardation layer 10. The barrier layer 30 prevents contaminants such as water vapor and oxygen from penetrating the organic material layer and the OLED structure, thereby preventing deterioration of the OLED.

Such a barrier layer can be vacuum deposited by methods such as sputtering, chemical vapor deposition, plasma enhanced chemical vapor deposition, evaporation, or a combination of these known methods. Dual plasma enhanced chemical vapor deposition is preferred.

The source material is an inorganic insulating material or polyacrylate (polyacrylate) containing silicon nitride (SiNx) by a commonly used silicon oxide (Si0 ₂₎ or alumina (Al ₂ O ₃₎ from the art, the polyimide (polyimide ), Polyamide, or organic insulating material including benzocyclobutene (BCB).

The barrier layer may be formed of either an inorganic insulating material or an organic insulating material. In order to further improve the effect of the barrier layer, it is preferable that the barrier layer has a structure in which the inorganic insulating material and the organic insulating material are stacked on each other.

The present invention is characterized by the organic light emitting display device including the touch panel. A polarizer 40 is laminated on the touch sensor 20 of the touch panel and an organic light emitting diode (OLED) 60 is bonded to the barrier layer 30.

Also, a cover glass or a cover film 50 may be laminated on the polarizer 40. At this time, the polarizer and the cover glass or the cover film are bonded by an adhesive, and the adhesive may be acrylic, polyvinyl alcohol, epoxy, or the like.

The polarizer 40 serves to cut off external light incident from the outside in order to prevent a decrease in contrast due to external light. At this time, the polarizer adheres to the transmission direction of the light emitted through the organic light emitting element.

Such a polarizer is one in which a dichroic dye is adsorbed and oriented on a stretched polyvinyl alcohol film.

The polarizer is usually produced by a process of uniaxially stretching a polyvinyl alcohol film, dyeing and adsorbing with a dichroic substance, treating with an aqueous solution of boric acid, and washing and drying.

The thickness of the polarizer may generally be from 5 to 40 mu m.

The polarizer and the touch sensor are bonded by a pressure-sensitive adhesive generally used in the art.

The organic light emitting diode (OLED) 60 is a self-luminous display device that uses a phenomenon in which light is generated while electrons and holes are combined in an organic layer when a current is supplied to a fluorescent or phosphorescent organic compound thin film.

The OLED has a structure in which an anode, a hole transporting layer, a light emitting layer, an electron transporting layer, and a cathode are sequentially formed on a substrate.

The cover glass or the cover film may be formed with a functional layer selected from the group consisting of antifouling property, anti-fingerprint property, antistatic property, hard coat property and antireflection property.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention. Such variations and modifications are intended to be within the scope of the appended claims.

Example  One : Touch panel  Produce

Plasma chemical vapor deposition (PECVD) was performed on one side of the? / 4 retardation layer to form an aluminum oxide barrier layer. The plasma chemical vapor deposition was performed under a vacuum of about 3 × 10 ^-3 torr under a mixed gas atmosphere of argon and oxygen.

Further, on the other surface of the? / 4 retardation layer, an electrode pattern is formed by etching to form a touch sensor in which the first electrode and the second electrode are arranged in an alternate arrangement.

Example  2: Manufacture of organic light emitting display

A PVA polarizer on which a hybrid adhesive layer of acrylate-organosilane was formed and a surface-treated cover film were bonded to each other. The bonding was performed such that the adhesive layer of the polarizer and the surface opposite to the surface treatment of the cover film were bonded to each other.

Thereafter, the surface of the polarizer on which the adhesive layer was not formed was bonded to the touch panel of Example 1. At this time, the polarizer and the touch sensor were bonded to each other and bonded using an acrylic adhesive.

Further, the barrier layer of the touch panel and the organic light emitting device were bonded to each other to produce an organic foot and a display device.

Comparative Example

A capacitive touch sensor was fabricated by forming first and second electrode patterns made of ITO by a sputtering method in a gas atmosphere of argon and oxygen mixed at a volume ratio of 99: 1 on both sides of a glass plate (thickness: 700 μm). Subsequently, a glass plate (thickness: 700 mu m) was bonded to the first electrode pattern using an adhesive sheet (thickness: 200 mu m) having an acrylic optical transparent pressure sensitive adhesive layer interposed between the two release films to produce a touch panel .

Thereafter, an organic light emitting display was manufactured using the touch panel in the same manner as in Example 2.

Test Example

The physical properties of the touch panel prepared in Examples and Comparative Examples were measured by the following methods, and the results are shown in Table 1.

1. Thickness

Measured using a contact thickness meter (DG50BP, SONY).

2. Flexibility ( Bending diameter )

The manufactured touch panel is cut into a size of 2.5 cm x 20 cm, and then the electrode surface of the touch panel is positioned outside the mandrel bar.

Thereafter, the touch panel was pressed against the rod like a fold, and then the degree of breakage of the surface treatment was evaluated using a three-wavelength lamp.

The maximum mandrel diameter when no discoloration or cracking of the touch panel does not occur is evaluated as the bending diameter of the touch panel by using a mandrel rod of various diameters,

3. Brightness

The luminance was measured using a spectroscopic radiation system (SR-3, Topcon) while driving the manufactured organic light emitting display. At this time, if the luminance is 5800 or more, it is regarded as excellent.

4. Sensitivity ( Touch )

A skilled engineer directly performed the sensory test by touching the surface of the organic light emitting display device with a finger.

<Evaluation method>

○: Immediate operation without malfunction

×: Operation is slow or malfunction occurs

division thickness
(탆) Bending diameter
(Mm) Luminance responsiveness Example 2 326 4 5820 ○ Comparative Example 1075 200 5804 ○

As shown in Table 2, the organic light emitting display device including the touch panel in which the touch sensor is formed on one side of the? / 4 retardation layer and the barrier layer is formed on the other side of the? / 4 retardation layer according to the present invention is thinner, lighter, Was superior.

10:? / 4 retardation layer
20: Touch sensor
30: barrier layer
40: Polarizer
50: cover glass or cover film
60: Organic light emitting device

Claims (7)

a touch sensor is formed on one surface of the? / 4 retardation layer,
A barrier layer is formed directly on the other surface,
Wherein the barrier layer is deposited by a method selected from the group consisting of sputtering, chemical vapor deposition, plasma enhanced chemical vapor deposition and evaporation.
The touch panel of claim 1, wherein the touch sensor is of a capacitive type.
The touch panel of claim 1, wherein the barrier layer is formed by plasma enhanced chemical vapor deposition.
An organic light emitting display device comprising the touch panel according to any one of claims 1 to 3.
The organic light emitting diode display according to claim 4, wherein the touch panel is a polarizer stacked on a touch sensor.
The OLED display according to claim 5, wherein a cover glass or a cover film is laminated on the polarizer.
7. The organic light emitting display according to claim 6, wherein the cover glass or the cover film is formed with a functional layer selected from the group consisting of antifouling property, fingerprint preventing property, antistatic property, hard coating property and antireflection property.

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