KR20110064881A - Display device - Google Patents

Abstract

PURPOSE: A display device is provided to form transmissive or white/black images on a desired location, thereby realizing a high resolution display device and precisely and effectively transferring information. CONSTITUTION: A white organic electroluminescent display panel(101) emits white or black per one sub pixel. A transmissive organic electroluminescent display panel(105) is bonded with the white organic electroluminescent display panel by an adhesive to emit red, green, or blue light per one sub pixel. The white organic electroluminescent display panel includes a first substrate(110), a first cell driving array, a white organic electroluminescent device, and a second substrate(130).

Description

Display Device

The present invention relates to a display device, and more particularly, to a display device that improves visibility and facilitates information transfer.

In recent years, with the development of the information society, various types of demands on display devices have increased, such as liquid crystal polymer (LCD), plasma display panel (PDP), organic electro luminescent display (OLED), field emission display (FED), and VFD. Research on flat panel displays such as (Vacuum Fluorescent Display) has been actively conducted.

Among them, a liquid crystal display (LCD) is a non-light emitting display device, and individually supplies data signals according to image information to pixels arranged in a matrix, thereby applying voltage to the liquid crystal for each pixel and adjusting light transmittance. By doing so, the display device can display a desired image. In order to display an image, a liquid crystal display device is provided with R, G, and B color filters.

In the case of a conventional medical white / black display panel using a general liquid crystal display device, when the white light is emitted using a color filter of three colors, R, G, and B, the pixel composition is limited, and thus a high resolution medical display panel for precise diagnosis is provided. There was a difficulty in manufacturing.

In order to overcome this, a white organic light emitting display device (WOLED) capable of manufacturing a high resolution panel has been in the spotlight. The organic light emitting display is a self-emission display device that displays an image by controlling the amount of light emitted from the organic light emitting layer between electrodes. The white organic light emitting display emits three kinds of light, and displays an image in white or black. .

However, although such an organic light emitting display device is a display panel capable of precise diagnosis, a user has a limitation in transmitting or displaying information using a touch screen or a program while showing a diagnosis screen.

In addition, in the case of a white organic light emitting display device without a color filter, only a gray color using a difference in luminance may be transmitted to transmit information on a screen, and thus there is a limit in effectively delivering necessary information.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a display device with improved visibility and easy information transfer.

The display device according to the present invention is bonded to the white organic light emitting display panel which emits white or black per one sub pixel, and the white organic light emitting display panel and an adhesive, and emits red, green or blue per one sub pixel. A transmissive organic light emitting display panel is included.

The white organic light emitting display panel may include a first substrate, a first cell driving array formed on the first substrate, a white organic light emitting diode driven by the first cell driving array, and emitting white or black light; And a second substrate bonded to the first substrate with a first cell driving array and the white organic light emitting diode interposed therebetween, wherein the white organic light emitting diode is electrically connected to the first cell driving array. And an organic light emitting layer including a second electrode facing the first electrode and a light emitting layer formed between the first electrode and the second electrode and emitting white light.

The light emitting layer has a structure in which a red light emitting layer, a green light emitting layer and a blue light emitting layer are stacked or tandem structures thereof, a structure in which a blue light emitting layer and a yellow light emitting layer are stacked or a tandem structure thereof, or a structure in which a blue light emitting layer and an orange light emitting layer are stacked or It is a tandem structure, a structure in which a red light emitting layer, a green light emitting layer, a blue light emitting layer, a yellow light emitting layer, and an orange light emitting layer is combined or laminated, or a tandem structure thereof.

The transmissive organic light emitting display panel includes a third substrate, a second cell drive array formed on the third substrate, a transmissive organic light emitting device that is driven by the second cell drive array, and emits red, green, or blue light; And a fourth substrate bonded to the third substrate with the second cell driving array and the transmissive organic light emitting device therebetween.

The transmissive organic light emitting diode is a third electrode electrically connected to the second cell driving array, a fourth electrode facing the third electrode, and is formed between the third electrode and the fourth electrode, a red light emitting layer, An organic light emitting layer including a green light emitting layer or a blue light emitting layer.

Subpixels of the white organic light emitting display panel and subpixels of the transmissive organic light emitting display panel are disposed to have an angle to each other.

The angle is from 3 degrees to 87 degrees.

The adhesive may be formed in a coating form or an adhesive film between the white organic light emitting display panel and the transmissive organic light emitting display panel.

The white organic light emitting display panel and the transmissive organic light emitting display panel are driven separately.

The display device may be a bonded structure of a bottom type white organic light emitting display panel and the transmissive organic light emitting display panel, or may be a bonded structure of a top type white organic light emitting display panel and the transmissive organic light emitting display panel, or a DOD type white organic light emitting display panel. The display panel and the transmissive organic light emitting display panel are bonded to each other.

The present invention can form a transmissive or white / black image at a desired specific position, thereby enabling the implementation of a high resolution display device and enabling accurate and efficient information transmission.

In particular, the present invention is effective to use for the use of patient information or the display of specific matters when using as a medical display panel.

Hereinafter, the display device according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic diagram illustrating a display device according to the present invention, and FIG. 2 is a cross-sectional view taken along the line II ′ of the display device of FIG. 1.

1 and 2, the display device 100 according to the present invention includes a white organic light emitting display panel 101 and a transmissive organic light emitting display panel 105 bonded to the adhesive 140.

The adhesive 140 may be formed in a coating form between the white organic light emitting display panel 101 and the transmissive organic light emitting display panel 105 or in an adhesive film form.

Referring to FIG. 3, the white organic light emitting display panel 101 includes a white substrate formed between the first substrate 110 and the second substrate 130 and the first substrate 110 and the second substrate 130 bonded to each other. Light emitting array 120. The white organic light emitting display panel 101 may be formed of a bottom type, a top type, or a DOD type.

The white light emitting array 120 may include a first cell driving array 122 formed on the first substrate 110, a white organic light emitting diode 124 and a white organic light emitting diode driven by the first cell driving array 122. The first partition wall 112 may be divided into sub pixel units. In the present invention, one sub pixel is defined as an intersection of a gate line (not shown) and a data line (not shown).

The first cell driving array 122 includes a switching thin film transistor (not shown), a driving thin film transistor (not shown), and a capacitor (not shown). The switching thin film transistor (not shown) is turned on when a scan pulse is supplied to a gate line (not shown) to supply a data signal supplied to the data line (not shown) to the driving thin film transistor.

The driving thin film transistor (not shown) controls the amount of light emitted by controlling the amount of current supplied from the power line to the white organic light emitting element 124 in response to the data signal.

The capacitor (not shown) serves to allow a constant current to flow through the driving transistor even when the switching transistor is turned off to maintain light emission of the white organic light emitting diode 124.

The white organic light emitting diode 124 is electrically connected to and driven by a drain electrode (not shown) of the driving thin film transistor to emit white light as the axtone formed by combining holes and electrons injected therein falls to a ground state. An image is displayed on the first substrate 110 or the second substrate 130.

To this end, the white organic light emitting diode 124 may include a first electrode (not shown) electrically connected to a drain electrode (not shown), a second electrode (not shown) that is an opposite electrode, and a gap between the first electrode and the second electrode. And an organic light emitting layer (not shown) which is formed at and emits white light.

The first electrode is an anode for hole injection, which is called an anode, and has a high work function and is formed of a transparent conductive layer or a metal conductive layer so that light emitted from the light emitting layer can come out of the device.

As the transparent conductive layer, indium tin oxide (ITO), tin oxide (TO), indium zinc oxide (IZO), indium tin zinc oxide (ITZO), or these It is formed by the combination of.

When the first electrode is formed of a transparent conductive layer, light emits light through the first substrate 110, and when the first electrode is a metal conductive layer, light emits light through the second substrate 110.

The second electrode is formed on the entire surface of the second substrate 130 and is called a cathode, and may be formed in at least one layer structure using a transparent conductive material or an opaque conductive material or in a multilayer structure thereof. As the opaque conductive material, Cr, Al, AlNd, Mo, Cu, W, Au, Ni, Ag, or the like may be used, and an alloy or an oxide thereof may be used.

The second electrode is preferably formed of an opaque conductive material when the first electrode is formed of a transparent conductive layer, and is formed of a transparent conductive material when the first electrode is a metal conductive layer. The transparent conductive material constituting the second electrode is not limited to the above materials, and an alloy of magnesium and silver of a thin film may be used. At this time, the thickness of the alloy of magnesium and silver is preferably 200 kPa or less.

The organic emission layer is a layer in which light is emitted as the axtone formed by combining holes and electrons injected from the first electrode and the second electrode falls to the ground state. The organic light emitting layer of the white organic light emitting diode 124 may include a hole injection layer (HIL), a hole transporting layer (HTL), an emission layer (EML), and an electron transporting layer (electron transporting layer) sequentially stacked. ETL) and an electron injection layer (EIL).

The light emitting layer of the white organic light emitting diode 124 includes an R light emitting layer, a G light emitting layer, and a B light emitting layer, and emits white light by mixing R, G, and B colors. The light emitting layer is not limited to the stacked combination of the above-described R light emitting layer, G light emitting layer, and B light emitting layer, and a mixed color of a hetero multilayer structure including a light emitting layer using a complementary color relationship of green, red, blue, and orange may be used.

Further, the light emitting layer may be a laminated structure of an R light emitting layer, a G light emitting layer, and a B light emitting layer, a combination of a B light emitting layer and a yellow light emitting layer, or a combination of a B light emitting layer and an orange light emitting layer, or a combination of a R light emitting layer, a G light emitting layer, a B light emitting layer, a yellow light emitting layer, and an orange light emitting layer, or a combination thereof. It can be made of a tandem (tamdem) structure of. The white organic light emitting diodes 124 are separated in sub pixel units by the first partition wall 112.

Although the white organic light emitting display panel 101 displays white or black color without a color filter, the white organic light emitting display panel 101 emits white or black light per sub-pixel, thereby enabling accurate image transfer. In particular, it is possible to implement a diagnostic screen such as a measurement image or a video in a medical device.

Referring to FIG. 4, the transmissive organic light emitting display panel 105 is a transmissive type formed between a third substrate 150 bonded to each other, a fourth substrate 170, and a third substrate 150 and a fourth substrate 170. Light emitting array 160.

The transmissive light emitting array 160 includes a second cell drive array 162 formed on the third substrate 150, a transmissive organic light emitting device 164 driven by the second cell drive array 162, and a transmissive organic light emitting device ( And a second partition 152 that separates 164 into sub-pixel units.

Since the configuration of the second cell driving array 162 is the same as that of the first cell driving array 112 of the white organic light emitting display panel 101, a description thereof will be omitted. The white organic light emitting display panel 101 and the transmissive organic light emitting display panel 105 are driven separately.

The transmissive organic light emitting diode 164 is electrically connected to and driven by a drain electrode (not shown) of the driving thin film transistor, and the axtone formed by combining holes and electrons injected therein falls to a ground state, and thus the third substrate 150. And red (R), green (G), or blue (B) light to the fourth substrate 170.

The transmissive organic light emitting diode 164 is formed between a third electrode (not shown) electrically connected to a drain electrode (not shown), a fourth electrode (not shown) serving as an opposite electrode, and a third electrode and a fourth electrode. An organic light emitting layer (not shown) including an R, G or B light emitting layer is included.

The third electrode is called an anode as a hole for hole injection, and has a high work function and is formed of a transparent conductive layer so that light emitted from the transmissive light emitting layer can come out of the device. As the transparent conductive layer, indium tin oxide (ITO), tin oxide (TO), indium zinc oxide (IZO), indium tin zinc oxide (ITZO), or these It is formed by the combination of.

The fourth electrode is formed on the entire surface of the fourth substrate 170 and is called a cathode, and may be formed of a transparent conductive material. The transparent conductive material constituting the fourth electrode is not limited to the above-described materials, and an alloy of magnesium and silver or an alloy of aluminum and silver may be used. At this time, the thickness of the fourth electrode is preferably 200 kPa or less.

The organic emission layer is a layer in which light is emitted as the axtone formed by combining holes and electrons injected from the third and fourth electrodes falls to the ground state. The organic light emitting layer of the transmissive organic light emitting diode 164 may include a hole injection layer (HIL), a hole transporting layer (HTL), an emission layer (EML), and an electron transporting layer (electron transporting layer) sequentially stacked. ETL) and an electron injection layer (EIL).

The light emitting layer of the transmissive organic light emitting device 164 includes an R light emitting layer, a G light emitting layer, or a B light emitting layer, and emits red, green, or blue light for each sub-pixel unit. Therefore, the transmissive organic light emitting diode 164 emits white light by three subpixels of a red subpixel, a green subpixel, and a blue subpixel. The transmissive organic light emitting diode 164 is separated in units of R, G, and B subpixels by the second partition wall 112.

The transmissive organic light emitting display panel 105 may display a red, green, or blue color for each sub-pixel, and thus it is easy to transmit or display information. In particular, it is possible to implement a screen for transmitting information such as a user's opinion or emphasis in a medical device.

Meanwhile, the white organic light emitting display panel 101 emits white or black light per one sub pixel, and the transmissive organic light emitting display panel 105 emits red, green, or blue color per one sub pixel. The subpixel sizes of the 101 and the transmissive organic light emitting display panel 105 do not coincide with each other and are arranged to have a predetermined angle to each other.

When the sub-pixels of the white organic light emitting display panel 101 and the sub-pixels of the transmissive organic light emitting display panel 105 are disposed to have a predetermined angle to each other, as shown in FIGS. 5A and 5B, the moire phenomenon is reduced. have. Therefore, the angle is preferably 3 degrees to 87 degrees.

As such, the display device according to the present invention combines the white organic light emitting display panel 101 and the transmissive organic light emitting display panel 105 to the white organic light emitting display panel 101 emitting white or black color per one subpixel. As a result, an additional description or information transmission can be implemented by the transmissive organic light emitting display panel 105 emitting red, green, or blue light per one sub-pixel while displaying a high-resolution accurate image.

In addition, the present invention is more effective in utilizing patient information, display of unusual details, and the like when utilized as a medical display device.

The above-described techniques represent presently preferred embodiments, and the present invention is not limited to the above-described embodiments and the accompanying drawings. Modifications and other uses of the embodiments will be apparent to those skilled in the art, and such changes and other uses are defined by the scope of the claims contained within or appended to the spirit of the invention.

1 is a schematic diagram illustrating a display device according to the present invention.

FIG. 2 is a cross-sectional view taken along the line II ′ of the display device of FIG. 1.

3 is a cross-sectional view illustrating a white organic light emitting display panel.

4 is a cross-sectional view illustrating a transmissive organic light emitting display panel.

5A and 5B are photographs showing effects of sub-pixel angles of the white organic light emitting display panel and the transmissive organic light emitting display panel.

<< Explanation of symbols for main part of drawing >>

101: white organic light emitting display panel 105: transmissive organic light emitting display panel

110: first substrate 112: first partition wall

122: first cell drive array 124: white organic light emitting element

130: second substrate 150: third substrate

152: second partition 162: second cell drive array

164: transmissive organic light emitting element 170: fourth substrate

Claims (10)

A white organic light emitting display panel emitting white or black light per one sub pixel; And And a transmissive organic light emitting display panel which is bonded to the white organic light emitting display panel with an adhesive and emits red, green, or blue colors per one sub-pixel. The display panel of claim 1, wherein the white organic light emitting display panel comprises: a first substrate; A first cell drive array formed on the first substrate; A white organic light emitting diode driven by the first cell driving array and emitting white or black light; And a second substrate bonded to the first substrate with the first cell driving array and the white organic light emitting diode interposed therebetween, The white organic light emitting diode may include a first electrode electrically connected to the first cell driving array; A second electrode opposite the first electrode and And an organic emission layer formed between the first electrode and the second electrode and including an emission layer emitting white light. The light emitting layer of claim 2, wherein the light emitting layer has a structure in which a red light emitting layer, a green light emitting layer, and a blue light emitting layer are stacked, or a tandem structure thereof. Or a tandem structure in which a blue light emitting layer and a yellow light emitting layer are stacked; Or a tandem structure in which a blue light emitting layer and an orange light emitting layer are stacked; A display device comprising a combination of a red light emitting layer, a green light emitting layer, a blue light emitting layer, a yellow light emitting layer, and an orange light emitting layer, a stacked structure thereof, or a tandem structure thereof. The display panel of claim 1, wherein the transmissive organic light emitting display panel comprises: a third substrate; A second cell drive array formed on the third substrate; A transmissive organic light emitting diode driven by the second cell driving array and emitting red, green, or blue light; And a fourth substrate bonded to the third substrate with the second cell driving array and the transmissive organic light emitting device therebetween. The method of claim 4, wherein the transmissive organic light emitting device comprises: a third electrode electrically connected to the second cell drive array; A fourth electrode opposed to the third electrode and And an organic light emitting layer formed between the third electrode and the fourth electrode and including a red light emitting layer, a green light emitting layer, or a blue light emitting layer. The display device of claim 1, wherein the sub-pixels of the white organic light emitting display panel and the sub-pixels of the transmissive organic light emitting display panel are disposed at angles to each other. The display device of claim 6, wherein the angle is 3 degrees to 87 degrees. The display device of claim 1, wherein the adhesive is formed in a coating form between the white organic light emitting display panel and the transmissive organic light emitting display panel or in an adhesive film form. The display device of claim 1, wherein the white organic light emitting display panel and the transmissive organic light emitting display panel are driven separately. The display device of claim 1, wherein the display device is a bonded structure of a bottom type white organic light emitting display panel and the transmissive organic light emitting display panel. The top type white organic light emitting display panel and the transmissive organic light emitting display panel A display device comprising a bonding structure of a DOD type white organic light emitting display panel and the transmissive organic light emitting display panel.

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