Display device, and method of manufacturing the display device

A display device and a method of manufacturing the display device include a substrate having a first region and a second region disposed at a peripheral portion of the first region. The substrate includes a plurality of first electrodes disposed on the first region and an insulation member selectively disposed in the first region. The insulating member has a plurality of openings which expose a portion corresponding to the first electrodes. The substrate includes light emitting patterns disposed on the first electrodes through the openings and the substrate has a second electrode disposed on the light emitting patterns. Accordingly, the thickness of the light emitting patterns is uniform so that the quality of an image generated from the light emitting patterns is improved.

TECHNICAL FIELD

The present invention relates to a display device and a method of manufacturing the display device. More particularly, the present invention relates to a display device with enhanced display quality and a method of manufacturing the display device.

BACKGROUND ART

Generally, a display device operates as an interface device that converts data generated by an information-processing device into an image.

The display device includes a cathode ray tube (CRT) display device, a liquid crystal display (LCD) device, an organic electro luminescent (EL) device, a plasma display panel (PDP) device etc. The CRT display device displays an image by controlling electron beams irradiated onto the fluorescent layer of the CRT screen. The LCD device displays an image using liquid crystal. The EL device displays an image through an organic light emitting layer that emits by a current supplied to the organic light emitting layer. The PDP displays an image by plasma.

The organic EL device has merits such as a lightweight, a small thickness, a high brightness, an excellent color-reappearance, a fast response speed, a capability of displaying a full color image, a low power consumption, a wide range of operational temperature, a low manufacturing cost in comparison with other display devices such as the LCD device.

The organic EL device includes anode electrodes, an organic layer, organic light emitting patterns, and a cathode electrode. The anode electrodes are disposed on a substrate in a matrix configuration, the organic layer is disposed on the substrate, and the organic layer has an opening that exposes the anode electrodes. The organic light-emitting patterns are disposed on the anode electrodes and emit light. The cathode electrode is disposed on the organic light-emitting patterns.

Conventional organic light-emitting patterns of the organic EL device have a multiple-layered structure. For example, the organic light-emitting patterns have a hole injection layer (HIL), an emission material layer (EML) formed on the HIL, and an electron injection layer (EIL) formed on the EIL.

The organic light-emitting patterns may be formed by various apparatus such as a slit mask processing apparatus, a spin coating processing apparatus, a vacuum deposition processing apparatus etc. Recently, the organic light-emitting patterns are formed by an ink-jet type drop filling device.

In forming the organic light-emitting patterns on the substrate, a speed of drying an organic light-emitting material of the organic light-emitting patterns is very important.

Generally, the organic light-emitting material includes a volatile solvent. When the light-emitting patterns is formed on the substrate by the ink-jet type drop filling device, the thickness of the organic light emitting-patterns are affected by the speed of drying the organic light emitting material. When the speed of drying the organic light emitting materials is locally different, the thickness of the organic light emitting-patterns may not be uniformly controlled so that a brightness uniformity of lights generated from the organic light emitting-patterns may not be uniformly controlled.

In order to overcome this problem, the droplet including organic material is formed on a non-effective display region disposed on an organic layer of the substrate as well as an effective display region, thereby forming dummy organic light-emitting patterns on the non-effective display region. The dummy organic light-emitting patterns adjust the speed of drying the organic light-emitting patterns formed on the effective display region.

However, the dummy organic light-emitting patterns disposed in the non-display region of the organic layer have a position higher than that of the organic light-emitting patterns in the display region by a thickness difference between the anode electrode and the organic layer. Therefore, a dummy organic material for forming the dummy organic light-emitting patters flows into the opening of the display region.

When the dummy organic material flows into the opening, the thickness of the organic light-emitting patters may not be controlled, so that the display quality of the image may be deteriorated.

DISCLOSURE OF THE INVENTION

Technical Problem

Accordingly, the present invention is provided to substantially obviate one or more problems due to limitations and disadvantages of the related art.

It is a feature of the present invention to provide a display device improving a display quality of an image.

It is another feature of the present invention to provide a method of manufacturing of the display device.

Technical Solution

In accordance with one aspect of the present invention, a display device includes a substrate, a plurality of first electrodes, an insulation member, a light emitting patterns and second electrodes. The substrate has a first region and a second region disposed at a peripheral portion of the first region. The plurality of first electrodes is disposed on the first region. The insulation member is selectively disposed in the first region and the insulation member has a plurality of openings that expose a portion corresponding to the first electrodes, respectively. The light emitting patterns is disposed on the first electrodes through the openings, respectively. The second electrode is disposed on the light emitting patterns.

In accordance with another aspect of the present invention, there is provided a method of manufacturing a display device. In the method, a plurality of first electrodes is formed on a first region formed on the substrate. An insulating layer formed on the first region and the insulating layer has openings so as to expose to the first electrodes. A plurality of light emitting patterns is formed on the first electrodes, respectively, and a second electrode formed on the first region to cover the light emitting patterns.

According to the present invention, a display device includes a first electrodes formed on the first region of a substrate in a matrix configuration. An organic insulating layer formed on the second region formed around the first region and the organic insulating layer has an openings corresponding to the first electrodes. A plurality of organic light emitting patterns is formed on the first electrodes for emitting a light. A second electrode is formed on the organic light emitting patterns. Thus, the lights generated from the organic light emitting patterns have uniformity brightness so that the quality of the image is improved.

BEST MODE FOR CARRYING OUT THE INVENTION

Display Device

FIG. 1is a plan view illustrating a display device in accordance with one embodiment of the present invention.FIG. 2is a cross-sectional view taken along a line I-I′ inFIG. 1.FIG. 3is an enlarged view illustrating a portion “B” inFIG. 2.FIG. 4is an enlarged view illustrating a portion “C” inFIG. 1.

Referring toFIGS. 1 to 4, a display device700includes a substrate100, a plurality of first electrodes200disposed on the substrate100, an insulating layer300, an organic light emitting pattern400and a second electrode500.

Referring toFIG. 1, the substrate100includes a transparent material or an opaque material. When the substrate100includes the transparent material, the first electrodes200may include a transparent conductive material such as indium thin oxide (ITO) or indium zinc oxide (IZO).

On the contrary, when the substrate100includes the opaque material such as an opaque synthetic resin, the first electrode200may include an opaque conductive material such as aluminum or aluminum alloy.

In this embodiment, the substrate100includes for example the transparent material and the first electrode200includes ITO or IZO.

The substrate100includes a first region110and a second region120. The first region110is disposed at the central portion of the substrate100and displays an image. The second region120is disposed at the peripheral portion of the first region110. An electrical circuit and a signal wire, etc. are formed in the second region120.

Referring again toFIG. 2andFIG. 4, the first electrodes200are disposed in the first region110of the substrate100, and the first electrodes200are arranged in a matrix configuration. In this embodiment, the first electrodes200include transparent conductive indium tin oxide (ITO) or indium zinc oxide (IZO).

The first electrodes200are disposed on the substrate100. The first electrodes200have a rectangular film shape. The first electrodes200have a length L on the substrate100in a first direction and have a width W on the substrate100in a second direction substantially perpendicular to the first direction. The first electrodes200are formed such that the first electrodes200are spaced apart from each other by an interval G.

Each of the first electrodes200receives a first driving signal through a driving circuit that includes two thin film transistors (TFT), a storage capacitance and driving signal wires.

The insulating layer300is disposed on the substrate100. The insulating layer includes a photosensitive organic material that reacts with a light, an organic material such as benzocyclobutene (BCB), and an inorganic material such as SiOC.

In this embodiment, the insulating layer300is selectively formed on the first region110of the substrate100. Referring toFIGS. 2 and 3, the insulating layer300has openings310. The openings310are disposed in the first region110in a matrix configuration as the first electrodes200are disposed on the first region110in a matrix configuration. Thus, the openings310are formed at positions corresponding to the first electrodes200. In this embodiment, the openings310may have a rectangular shape, a hexagonal shape, an octagonal shape or a circular shape etc.

Each of the openings310may be arranged at the central portions of the first electrodes200. Alternatively, the openings310are formed such that central portions of the openings310are deviated from the central portions of the first electrodes200. In this embodiment, each of the openings310is formed on the central portion of the first electrodes200. The openings310have a various function. That is, the openings310expose the first electrodes200and receive the flowable organic material in the openings310to prevent a spread of the organic material etc.

Referring again toFIG. 3, an angle θ formed between the first electrodes200and an inner wall320of the openings310is in a range of about 30° to about 165°. When the angle θ is less than about 30° or is more than about 165°, uniformity of the thickness of the organic light emitting patterns may be deteriorated so that the brightness of the light generated from the light emitting patterns may not be controlled. In this embodiment, the openings310formed at the insulating layer300are formed through a photolithography process or a dry etching process.

Referring again toFIGS. 2 and 3, the organic light emitting patterns400is formed on the first electrode200through the opening310formed at the insulating layer300. The organic light emitting patterns400include a hole injection layer (HIL)410and an emitting material layer (EML)420. The hole injection layer410is disposed on the first electrodes200, and the emitting material layer420is disposed on the emitting material layer420.

In order to form the organic light emitting patterns400on the first electrodes200, an organic material including a volatile solvent is dropped into the openings310and dried so that the light emitting patterns are formed on the first electrodes200.

The thickness of the organic light emitting patterns400formed thereon is affected by the speeds of drying the organic material. When the speeds of drying the organic material is different from each other, the thickness of the organic light emitting patterns400may not be controlled so that a brightness uniformity of lights generated from the organic light emitting patterns400may not be controlled. Such a problem may occur at a first electrodes200arranged around a boundary between the first and second regions110and120.

To overcome this problem, the second region120has dummy light emitting patterns430including a dummy organic material that include the volatile solvent, so that the speed of drying the organic material positioned on the first electrodes200arranged around the boundary may be uniformly controlled.

Alternatively, the dummy light emitting patterns430are directly disposed on a passivation layer (not shown) formed on the second region120while the driving circuit is manufactured on the first region110. The dummy light emitting patterns430include a dummy hole injection layer432or includes the dummy hole injection layer432and a dummy emitting layer434.

When the insulating layer300remains on the second region120, the dummy organic material for forming the dummy light emitting patterns430is positioned on the insulating layer300of the second region120. Accordingly, the organic material may be capable of flowing into the opening310formed in the first region110. When the dummy organic material flows into the opening310, the display quality of the image may not be controlled.

However, in this embodiment, the dummy organic material may not flow into the opening310because the dummy organic material and the organic material have substantially an identical height from the substrate100.

FIG. 5is partially cut plan view illustrating another embodiment of the present invention.

Referring toFIG. 5, the insulating layer300is extended from the first region110to the second region120. The extended length of the insulating layer300is smaller than the length formed between the dummy organic light emitting patterns430and the organic light emitting patterns400.

Alternatively, because the dummy organic light emitting patterns430and the organic light emitting patterns400are arranged at intervals apart from the width of the openings310, the extended length of the insulating layer is smaller than the width of the openings310.

Referring again toFIG. 2, after the organic light emitting patterns are formed on the first electrodes200, the second electrode500is formed on the entire face of the substrate100. The second electrode500includes aluminum or aluminum ally that has a low work function. The second electrode500is disposed on the insulating layer300and is electrically connected to the organic light emitting patterns400.

A second driving signal for displaying the image generated from a driving circuit (not shown) formed on a second region120is provided with the second electrode500.

FIG. 6is a plan view illustrating a display device in accordance with another embodiment of the present invention.FIG. 7is a cross-sectional view taken along a line B1-B2inFIG. 6.

Referring toFIGS. 6 and 7, a display device700includes a plurality of first electrodes200, an insulating layer300, organic light emitting patterns400and a second electrode500.

The substrate100includes a transparent substrate or an opaque substrate. When the substrate100includes the transparent substrate, the first electrodes200include a transparent conductive material, for example, indium thin oxide (ITO) or indium zinc oxide (IZO).

On the contrary, when the substrate100includes the opaque substrate that includes an opaque synthetic resin material, the first electrodes200include an opaque conductive material. For example, the first electrodes200include aluminum or aluminum alloy. In this embodiment, the substrate100includes the transparent substrate.

The substrate100includes a first region110and a second region120. The first region110is disposed at the central portion of the substrate100to display an image. The second region120is disposed at the peripheral portion of the first region110to form an electrical circuit.

The first electrodes200are disposed in the first region110of the substrate100in a matrix configuration. In this embodiment, the first electrodes200may have a rectangular shape. The first electrodes200have a length L in a first direction and have a width W in a second direction substantially perpendicular to the first direction. The first electrodes200are formed at regular intervals spaced apart from each other. In addition, each of the first electrodes200has the regular intervals of about G.

A first driving signal for displaying the image generated from a driving circuit (not shown) is provided with the first electrodes200. The driving circuit includes two thin film transistors (TFT), storage capacitor and driving signal wires.

The insulating layer300includes a first insulating layer360and a second insulating layer370. The first insulating layer360is positioned on the first region110of the substrate100. A first insulating layer360includes a photosensitive organic material that reacts with a light, an organic material such as benzocyclobutene (BCB), an inorganic material such as SiOC.

The first insulating layer360has a plurality of openings310. The openings310are formed at positions corresponding to the first electrodes200. The openings310are disposed in the first region110in a matrix configuration because the first electrodes200are disposed on the first region110in a matrix configuration.

In this embodiment, the openings310may have a rectangular shape, a hexagonal shape, an octagonal shape or a circular shape in plane.

Each of the openings310may be arranged at the central portion of the first electrodes200. The openings310may be eccentrically arranged relative to the central portion of the first electrodes200. In this embodiment, the openings310are eccentrically arranged relative to the central portion of the first electrodes200. The openings310have a various function as the exposing of the first electrodes200or a receiving of the flowable organic material in the openings310.

The second insulating layer370is positioned on the second region120. The second insulating layer370is formed at regular intervals spaced apart from the first insulating layer360in plane. As a result, a groove125is formed between the first and second insulating layers360and370. The width of the groove125is broader than the width of the opening310.

The groove125prevents the dummy organic material disposed in the second region110from flowing into the opening310.

The organic light emitting patterns400are disposed on the first electrodes200through the opening310formed at the insulating layer300. The organic light emitting patterns400include a hole injection layer410and a light emitting layer420. The light emitting layer430is positioned on the hole injection layer420.

In order to form the organic light emitting patterns, an organic material having a volatile solvent is dropped and dried into the opening310so that the light emitting patterns are formed on the first electrodes200.

The thickness of the organic light emitting-patterns400formed thereon is affected by the speeds of drying the organic light emitting patterns400. When the speeds of drying the organic light emitting-patterns400are different each other, the thickness of the organic light emitting patterns400may not be controlled so that a brightness uniformity of lights generated from the organic light emitting patterns400may not be controlled. Such a problem may occur at a first electrodes200arranged around a boundary between first and second regions110and120.

To overcome this problem, the second region has dummy light emitting patterns430including a dummy organic material that has the volatile solvent, so that the speed of drying the organic material positioned on the first electrodes200arranged around the boundary may be uniformly controlled.

Alternatively, the dummy light emitting patterns430may be directly disposed on a passivation layer (not shown) formed on the second region120while the driving circuit is manufactured on the first region110. The dummy light emitting patterns430include a dummy hole injection layer432and a dummy emitting layer434formed thereon.

When the insulating layer300remains on the second region120, the dummy organic material for forming the dummy light emitting patterns430is positioned on the insulating layer300of the second region120. Accordingly, the organic material may be capable of flowing into the opening310formed in the first region110. When the dummy organic material flows into the opening310, the display quality of the image may not be controlled.

However, in this embodiment, the dummy organic material may not flow into the opening310because the groove125is formed between the first and second insulting layer360and370. The dummy organic material positioned in the groove125and the organic material positioned on the first electrodes200have substantially an identical height from the substrate100.

After the organic light emitting patterns are formed on the first electrode200, the second electrode500is formed on the entire face of the substrate100. The second electrode500includes aluminum or aluminum ally that has a low work function. The second electrode500is disposed on the insulating layer300and is electrically connected to the organic light emitting patterns400.

A second driving signal for displaying the image generated from a driving circuit (not shown) formed on a second region120is provided with the second electrode500.

FIG. 8is a plan view illustrating a display device in accordance with another embodiment of the present invention.FIG. 9is a cross-sectional view taken along a line B3-B4inFIG. 8.

Referring toFIGS. 8 and 9, a display device700includes a substrate100, a plurality of first electrodes200, an insulating layer300, an organic light emitting pattern400and a second electrode500.

The substrate100includes a transparent substrate or an opaque substrate. When the substrate100includes the transparent substrate, the first electrodes200include a transparent conductive material, for example, indium thin oxide (ITO) or indium zinc oxide (IZO).

On the contrary, when the substrate100includes the opaque substrate that has an opaque synthetic resin material, the first electrode200includes an opaque conductive material, for example, aluminum or aluminum alloy. In this embodiment, the substrate100includes the transparent substrate.

The substrate100includes a first region110and a second region120. The first region110is disposed at the central portion of the substrate100to display an image. The second region120is disposed at the peripheral portion of the first region110to form an electrical circuit.

The first electrodes200are disposed in the first region110of the substrate100in a matrix configuration. In this embodiment, the first electrodes200may have a rectangular shape. The first electrodes200have a length L in a first direction and have a width W in a second direction substantially perpendicular to the first direction. The first electrodes200are formed at regular intervals spaced apart from each other. In addition, each of the first electrodes200has the regular intervals of about G.

A first driving signal for displaying the image generated from a driving circuit (not shown) is provided with the first electrodes200. The driving circuit includes two thin film transistors (TFT), storage capacitor and driving signal wires.

The insulating layer300is positioned on the substrate100. The insulating layer300includes a photosensitive organic material that reacts with a light, an organic material such as benzocyclobutene (BCB), an inorganic material such as SiOC.

In this embodiment, the insulating layer300is selectively formed on the first region110of the substrate100. In addition, the insulating layer300has first openings310and second openings125a.

The first openings310are formed at positions corresponding to the first electrodes200. The first openings310are disposed in the first region110in a matrix configuration because the first electrodes200are disposed on the first region110in a matrix configuration. In this embodiment, the first opening310may have a rectangular shape, a hexagonal shape, an octagonal shape or a circular shape in plane.

Each of the first openings310may be arranged positions at the central portion of the first electrodes200. The first openings310may be eccentrically arranged relative to the central portion of the first electrodes200. In this embodiment, the first openings310are eccentrically arranged relative to the central portion of the first electrodes200. The first openings310have a various function as the exposing of the first electrodes200, a receiving of the flowable organic material, etc.

The second openings125aare formed on the second region120of the insulating layer300. The second openings125aare arranged in a matrix configuration. Intervals between the second openings125aare substantially identical to the intervals between the first openings310. The gap formed between the first and second openings310and125ais narrower than the width of the first and second openings310and125a.

The organic light emitting patterns400are disposed on the first electrode200through the first opening310formed on the insulating layer300. The organic light emitting patterns400include a hole injection layer410and a light emitting layer420. The hole injection layer410is positioned on the first electrode200and the light emitting layer420is disposed on the hole injection layer410.

In order to form the organic light emitting patterns, an organic material having a volatile solvent is dropped and dried into the opening310so that the light emitting patterns are formed on the first electrodes200.

The thickness of the organic light emitting-patterns400formed thereon are affected by the speeds drying of the organic light emitting-patterns400. When the speeds of drying the organic light emitting-patterns400is different each other, the thickness of the organic light emitting-patterns400may not be controlled so that a brightness uniformity of lights generated from the organic light emitting-patterns400may not be controlled. Such a problem may occur at a first electrodes200arranged around a boundary between first and second regions110and120.

To overcome this problem, the second region has dummy light emitting patterns430including a dummy organic material that has the volatile solvent, so that the speed of drying the organic material positioned on the first electrodes200arranged around the boundary may be uniformly controlled.

Alternatively, the dummy light emitting patterns430may be directly disposed on a passivation layer (not shown) formed on the second region120while the driving circuit is manufactured on the first region110. The dummy light emitting patterns430includes a dummy hole injection layer432or includes the dummy hole injection layer432and a dummy emitting layer434.

When the insulating layer300remains on the second region120, the dummy organic material for forming the dummy light emitting patterns430is positioned on the insulating layer300of the second region120. Accordingly, the organic material may be capable of flowing into the openings310formed in the first region110. When the dummy organic material flows into the openings310, the display quality of the image may not be controlled.

However, in this embodiment, the dummies organic material may not flow into the openings310because the dummy organic material and the organic material have substantially an identical height from the substrate100.

After the organic light emitting patterns400forms on the first electrode200, the second electrode500is formed on the entire face of the substrate100. The second electrode500includes aluminum or aluminum ally that has a low work function. The second electrode500is disposed on the insulating layer300and is electrically connected to the organic light emitting patterns400.

A second driving signal for displaying the image generated from a driving circuit (not shown) formed on a second region120is provided with the second electrode500.

Method of Manufacturing of a Display Device

FIG. 10is a cross-sectional view illustrating a substrate in accordance with still another embodiment of the present invention.

Referring toFIG. 10, the substrate100includes a first region110for displaying an image and a second region120disposed at a peripheral portion of the first region110.

A first conductive layer200aincluding ITO or IZO is formed on the entire face of the substrate100. The first conductive layer200ais formed by a sputtering process or a chemical vapor deposition (CVD) process.

Then, a photo resist material is coated on the first conductive layer200aby a spin coating process or a slit coating process, so that a photoresist film200bis formed on the first conductive layer200a.

Next, a mask201aligns over the substrate100. The mask201has a transparent body201a, light absorbing portions201band light transmitting portions201c. The light absorbing portions201bhaving a quadrangular shape are formed on the transparent body in a matrix configuration. The light transmitting portions are formed between the light absorbing portions201bin a lattice configuration.

Then, a light generated from a light source (not shown) travels onto the photoresist film200bthrough the light transmitting portion201cof the mask201. A photoresist film200bis exposed to the light so that a photoresist pattern200cis formed on the first conductive layer200aby a development process.

FIG. 11is a cross-sectional view illustrating a first electrode and a photoresist pattern in accordance with still another embodiment of the present invention.

Referring toFIG. 11, a portion of the first conductive layer200aexposed to the photoresist pattern200cis etched by a dry etching process or a wet etching process so that a first electrodes200are formed on the substrate100in a matrix configuration.

In this embodiment, a driving circuit part for providing a driving voltage is formed on the substrate100before the first electrode200is formed on the substrate100.

FIG. 12is a cross-sectional view illustrating the first electrode inFIG. 11.

Referring toFIG. 12, the photoresist pattern200cfor forming the first conductive layer200ais removed by a photoresist stripper solution so that the first electrodes200are disposed on the substrate100in a matrix configuration.

FIG. 13is a plan view illustrating the first electrodes formed on the substrate inFIG. 12.

Referring toFIG. 13, the first electrodes200formed on the substrate100are formed at portions at regular intervals G spaced apart from each other. The first electrodes200having a quadrangular shape have a length L in a first direction and have a width W in a second direction substantially perpendicular to the first direction.

FIG. 14is a cross-sectional view illustrating an insulating layer formed on the substrate inFIG. 13.

Referring toFIG. 14, an insulating layer is formed on the entire face of the substrate100to cover the first electrodes200. At this time, the insulating layer may include an organic material or an inorganic material. The organic material may include such as a photoresist material or benzocyclobutene (BCB) and the inorganic material may include such as a SiOC. In this embodiment, the insulating layer includes the photoresist material.

Referring toFIG. 15, a mask301aligns over the insulating layer300b. The mask301selectively provides a light generated from a light source (not shown) from the insulating layer300b. In this embodiment, the insulating layer is selectively exposed to the light passing therethrough.

For this, the mask301has a transparent body301a, light absorbing portions301band light transmitting portions301c. The light transmitting portions301care formed on the transparent body301acorresponding to the first electrode200in a lattice configuration. The light absorbing portions301bare formed between the light transmitting portions301c.

In state that the mask301aligns over the substrate100, the light generated from the light source travels onto the insulating layer300apassing through the light transmitting portions301cof the mask301, so that the insulating layer300ais partially exposed to the light.

FIG. 16is a cross-sectional view illustrating isolation patterns formed on the substrate inFIG. 15.

Referring toFIG. 16, the insulating layer300aexposed to the light is developed with a developing solution. Accordingly, the insulating layer300formed at the second region120and the insulating layer300acorresponding to the first electrode200are removed to the insulating layer300aso that isolation patterns300having an opening310are formed on the substrate100. Alternatively, the isolation patterns may be capable of including the photoresist material as well as the BCB or the SiOC. Also, the isolation patterns are formed by a photo process or a dry etching process.

The openings310formed at the insulating layer300ahave a circular shape or quadrangular shape in plane.

An angle formed between the first electrodes200and the sidewall of the openings310has substantially about 30° to about 165°. When the angle has about 30° to about 165°, the thickness of an organic light emitting layer400formed on the first electrodes200may be precisely controlled.

Each of the openings310may be arranged positions at the central portion of the first electrodes200or may be eccentrically arranged positions relative to the central portion of the first electrodes200. In this embodiment, the openings310are eccentrically arranged relative to the central portion of the first electrodes200.

FIG. 17is a plan view illustrating isolating patterns in accordance with another embodiment of the present invention.FIG. 18is a cross-sectional view taken along a line D1-D2inFIG. 17.

Referring toFIGS. 17 and 18, in this embodiment, isolating patterns300are extended from the boundary of the first and second regions110and120to the second region120. An extended length of the isolating patterns300is narrower than the widths of the openings310.

FIG. 19is a cross-sectional view illustrating an organic light emitting patterns formed in the first and second regions inFIG. 17.

Referring toFIG. 19, organic light emitting patterns are formed in the openings310of the isolation patterns300positioned on the first region110. To form the organic light emitting patterns, a hole injection layer410including a hole injection material is formed on the first electrodes200. The hole injection material having a droplet shape is dropped into the openings310of the isolation patterns300by a spraying nozzle and the hole injection material is dried.

The hole injection material includes a volatile solvent and the thicknesses of the hole injection layers410are difference in accordance with a speed of drying the hole injection material. When the thicknesses of the hole injection layers410are difference each other, a display failure may occurs to the display device.

In order to prevent this problem, a dummy hole injection layer430is formed on the second region120at a regular intervals spaced apart form the hole injection layers410to control the speeds of drying the hole injection layers410.

Next, the light emitting material is dropped in the openings310and the light emitting material is dried to form the light emitting layer420. In addition, a dummy light emitting material is dropped in the second region120and the light emitting material is dried to control the speed of drying the dummy light emitting material.

FIG. 20is a cross-sectional view illustrating a second electrode formed on the substrate inFIG. 19.

Referring toFIG. 20, after the first electrode200, the isolating patterns300, the organic light emitting patterns400are sequentially formed on the substrate100, the second electrode500is formed on the substrate100to electrically connect to the organic light emitting patterns400. The second electrode500includes a metal, for example, aluminum, aluminum ally etc. The second electrode500is formed on the entire face of the substrate100.

Having described the exemplary embodiments of the present invention and its advantages, it is noted that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by appended claims.