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Patent Issued for Laser Induced Thermal Imaging Apparatus and Fabricating Method of Organic Light Emitting Diode Using the Same

January 21, 2014



By a News Reporter-Staff News Editor at Life Science Weekly -- A patent by the inventors Noh, Sok Won (Yongin-si, KR); Lee, Seong Taek (Yongin-si, KR); Kim, Mu Hyun (Yongin-si, KR); Song, Myung Won (Yongin-si, KR); Kim, Sun Hoe (Yongin-si, KR); Seong, Jin Wook (Yongin-si, KR), filed on June 26, 2013, was published online on January 7, 2014, according to news reporting originating from Alexandria, Virginia, by NewsRx correspondents (see also Samsung Display Co., Ltd.).

Patent number 8623583 is assigned to Samsung Display Co., Ltd. (Yongin-si, KR).

The following quote was obtained by the news editors from the background information supplied by the inventors: "The present invention relates to a laser induced thermal imaging apparatus and a fabricating method of an organic light emitting diode using the same, and more particularly to a laser induced thermal imaging apparatus and a fabricating method of an organic light emitting diode using the same, which laminate a donor film and an acceptor substrate using magnetic force.

"An organic light emitting device includes a light emitting layer formed between the first and second electrodes, and emits light when a voltage is applied between the electrodes. A laser induced thermal imaging (LITI) process may be used to fabricated the organic light emitting device.

"In general, at least a laser, an acceptor substrate and a donor substrate (or donor film) are needed for the laser induced thermal imaging. In a laser induced thermal imaging method, the laser is radiated to a donor substrate including a base substrate, a light-to-heat conversion layer (LTHC) and a transfer layer (or imaging layer) to convert the laser that passes through the base substrate into heat at the light-to-heat conversion layer, such that the light-to-heat conversion layer is deformed and expanded. This way, the transfer layer adjacent to the light-to-heat conversion layer is also deformed and expanded, and transferred to (or imaged on) the acceptor substrate.

"When performing the laser induced thermal imaging method, a chamber in which the transfer is performed typically becomes a vacuum state. However, in the prior art, there has been a problem in that the transfer layer is not transferred well because space (or a gap) or impurities are created between the donor substrate and the accepter substrate when a laser-to-heat conversion is performed in the vacuum state. Therefore, in the laser induced thermal imaging method, a method of laminating the donor and accepter substrates is important, and to resolve the problems with the space or the impurities, various methods have been investigated.

"FIG. 1 is a cross-sectional view that shows a prior art laser induced thermal imaging apparatus 10 for resolving the above-mentioned problem. According to FIG. 1, the laser induced thermal imaging apparatus 10 includes a substrate stage 12 placed in a chamber 11 and a laser radiating apparatus 13 placed at an upper portion of the chamber 11. The substrate stage 12 is a stage for placing an accepter substrate 14 and a donor film 15 introduced in the chamber 11 in turn.

"The acceptor substrate 14 and the donor film 15 are laminated to each other prior to transferring the transfer layer of the donor film 15 to the acceptor substrate 14. During lamination, the chamber 11 is typically not maintained in the vacuum state, but a vacuum pump P is used to absorb impurities. Since the chamber is not in a vacuum state during lamination, the reliability or the lifetime of the resulting organic light emitting device can be reduced because of oxygen, moisture, or the like in the chamber 11.

"On the other hand, when the chamber 11 is maintained in the vacuum state during lamination, it is difficult to absolutely prevent creation of impurities 1 and space between the accepter substrate 14 and the donor film 15."

In addition to the background information obtained for this patent, NewsRx journalists also obtained the inventors' summary information for this patent: "Accordingly, it is an aspect of the present invention to provide a laser induced thermal imaging apparatus and a fabricating method of organic light emitting diodes using the same, which laminate an acceptor substrate and a donor film using a magnetic force in a vacuum state, and are used for forming a pixel array on the acceptor substrate.

"The foregoing and/or other aspects of the present invention are achieved by providing a laser induced thermal imaging apparatus including: a substrate stage including a magnet or magnetic substance, the acceptor substrate and a donor film being sequentially fed and laminated on the substrate stage, the acceptor substrate having a pixel definition region in which first, second, and third sub-pixels are formed in a stripe pattern, the donor film having an organic light emission layer to be transferred on the pixel definition region; a laser oscillator for irradiating a laser to the donor film; a contact frame adapted to be disposed between the substrate stage and the laser oscillator for forming a magnetic force with the substrate stage, and including an opening through which the laser passes; and a contact frame feed mechanism for moving the contact frame in a direction of the substrate stage.

"According to another aspect of a first embodiment of the present invention, there is provided a method for fabricating an organic light emitting diode having an emission layer formed between electrodes by the laser induced thermal imaging apparatus, the method including: placing an acceptor substrate having a pixel definition region in which first, second, and third sub-pixels are formed in a stripe pattern, on a substrate stage having a magnet; placing a donor film having an organic light emission layer to be transferred on the pixel definition region, on the acceptor substrate; adhering a first contact frame to a first donor film using magnetic attraction, the first contact frame having a magnet, a first opening being formed at the first contact frame, a laser for transferring a first color organic light emission layer passing through the opening; irradiating the laser to the first donor film through the first opening of the first contact frame to transfer the first color organic light emission layer to a first sub-pixel region; separating the first contact frame from the first donor film; placing a second donor film having a second color organic light emission layer on the acceptor substrate in place of the first donor film; adhering a second contact frame to a second donor film using magnetic attraction, the second contact frame having a magnet, a second opening being formed at the second contact frame, a laser for transferring a second color organic light emission layer passing through the second opening; irradiating the laser to the second donor film through the second opening of the second contact frame to transfer the second color organic light emission layer to a second sub-pixel region; separating the second contact frame from the second donor film; placing a third donor film having a third color organic light emission layer on the acceptor substrate in place of the second donor film; adhering a third contact frame to a third donor film using magnetic attraction, the third contact frame having a magnet, a third opening being formed at the third contact frame, a laser for transferring a third color organic light emission layer passing through the third opening; and irradiating the laser to the third donor film through the third opening of the third contact frame to transfer the third color organic light emission layer to a third sub-pixel region.

"According to another aspect of a second embodiment of the present invention, laser induced thermal imaging apparatus includes: a substrate stage including a magnet or magnetic substance, the acceptor substrate and a donor film being sequentially fed and laminated on the substrate stage, the acceptor substrate having a pixel definition region in which first, second, and third sub-pixels are formed in a mosaic pattern, the donor film having an organic light emission layer to be transferred on the pixel definition region; a laser oscillator for irradiating a laser to the donor film; a contact frame adapted to be disposed between the substrate stage and the laser oscillator for forming a magnetic force with the substrate stage, and including an opening through which the laser passes; and a contact frame feed mechanism for moving the contact frame in a direction of the substrate stage.

"According to another aspect of a second embodiment of the present invention, there is provided a method for fabricating an organic light emitting diode having an emission layer formed between electrodes by the laser induced thermal imaging apparatus, the method including: placing an acceptor substrate having a pixel definition region in which first, second, and third sub-pixels are formed in a mosaic pattern, on a substrate stage having a magnet; placing a donor film having an organic light emission layer to be transferred on the pixel definition region, on the acceptor substrate; adhering a first contact frame to a first donor film using magnetic attraction, the first contact frame having a magnet, a first opening being formed at the first contact frame, a laser for transferring a first color organic light emission layer passing through the opening; irradiating the laser to the first donor film through the first opening of the first contact frame to transfer the first color organic light emission layer to a first sub-pixel region; separating the first contact frame from the first donor film; placing a second donor film having a second color organic light emission layer on the acceptor substrate in place of the first donor film; adhering a second contact frame to a second donor film using magnetic attraction, the second contact frame having a magnet, a second opening being formed at the second contact frame, a laser for transferring a second color organic light emission layer passing through the second opening; irradiating the laser to the second donor film through the second opening of the second contact frame to transfer the second color organic light emission layer to a second sub-pixel region; separating the second contact frame from the second donor film; placing a third donor film having a third color organic light emission layer on the acceptor substrate in place of the second donor film; adhering a third contact frame to a third donor film using magnetic attraction, the third contact frame having a magnet, a third opening being formed at the third contact frame, a laser for transferring a third color organic light emission layer passing through the third opening; and irradiating the laser to the third donor film through the third opening of the third contact frame to transfer the third color organic light emission layer to a third sub-pixel region.

"According to an aspect of a third embodiment of the present invention, there is provided a laser induced thermal imaging apparatus including: a substrate stage including a magnet or a magnetic substance, the acceptor substrate and a donor film being sequentially fed and laminated on the substrate stage, the acceptor substrate having a pixel definition region in which first, second, and third sub-pixels are formed in a delta pattern, the donor film having an organic light emission layer to be transferred on the pixel definition region; a laser oscillator for irradiating a laser to the donor films; a contact frame adapted to be disposed between the substrate stage and the laser oscillator for forming a magnetic force with the substrate stage, and including an opening through which the laser passes; and a contact frame feed mechanism for moving the contact frame in a direction of the substrate stage.

"According to another aspect of a third embodiment of the present invention, there is provided a method for fabricating an organic light emitting diode having an emission layer formed between electrodes by the laser induced thermal imaging apparatus, the method including: placing an acceptor substrate having a pixel definition region in which first, second, and third sub-pixels are formed in a delta pattern, on a substrate stage having a magnet; placing a donor film having an organic light emission layer to be transferred on the pixel definition region, on the acceptor substrate; adhering a first contact frame to a first donor film using magnetic attraction, the first contact frame having a magnet, a first opening being formed at the first contact frame, a laser for transferring a first color organic light emission layer passing through the opening; irradiating the laser to the first donor film through the first opening of the first contact frame to transfer the first color organic light emission layer to a first sub-pixel region; separating the first contact frame from the first donor film; placing a second donor film having a second color organic light emission layer on the acceptor substrate in place of the first donor film; adhering a second contact frame to a second donor film using magnetic attraction, the second contact frame having a magnet, a second opening being formed at the second contact frame, a laser for transferring a second color organic light emission layer passing through the second opening; irradiating the laser to the second donor film through the second opening of the second contact frame to transfer the second color organic light emission layer to a second sub-pixel region; separating the second contact frame from the second donor film; placing a third donor film having a third color organic light emission layer on the acceptor substrate in place of the second donor film; adhering a third contact frame to a third donor film using magnetic attraction, the third contact frame having a magnet, a third opening being formed at the third contact frame, a laser for transferring a third color organic light emission layer passing through the third opening; and irradiating the laser to the third donor film through the third opening of the third contact frame to transfer the third color organic light emission layer to a third sub-pixel region.

"According to an aspect of a fourth embodiment of the present invention, there is provided a laser induced thermal imaging apparatus for forming an emission layer of an organic light emitting diode in which one pixel includes at least three sub-pixels having first to third emission layers, at least one of the first to third emission layers is formed at an entire surface of a pixel portion in common, the apparatus including: a chamber including a substrate stage and a contact frame, the substrate stage having a magnet or a magnet material, and the contact frame being adapted to be disposed between the substrate stage and a laser oscillator, and a laser induced thermal imaging is performed in the chamber; the laser oscillator for irradiating a laser to the contact frame and a donor film; and a contact frame feed mechanism for moving the contact frame in a direction of the substrate stage, wherein the contact frame includes an opening, the first and second sub-pixels being formed corresponding to the opening, and the substrate stage forming a magnetic force with the contact frame.

"According to another aspect of a fourth embodiment of the present invention, there is provided a method for fabricating an organic light emitting diode having an emission layer formed between first and second electrodes by the laser induced thermal imaging apparatus, the method including: placing an acceptor substrate having first, second, and third sub-pixel regions constituting one pixel on a substrate stage having a magnet or magnetic substance; placing a donor film having an organic light emission layer to be transferred on the pixel definition region, on the acceptor substrate; adhering a contact frame having a magnet or magnetic substance to a first donor film using magnetic attraction, an opening being formed at the contact frame, a laser for transferring first and second color organic light emission layers passing through the opening; irradiating the laser from a laser oscillator to the first donor film through the opening of the contact frame to transfer the first color organic light emission layer to the first sub-pixel region; separating the contact frame from the first donor film; placing a second donor film having a second color organic light emission layer on the acceptor substrate in place of the first donor film; again adhering the contact frame to a second donor film using magnetic attraction; and irradiating the laser from a laser oscillator to the second donor film through the opening of the contact frame to transfer the second color organic light emission layer to the second sub-pixel region, wherein an emission of the third sub-pixel is deposited and formed at a pixel portion region in which the pixels are formed.

"According to an aspect of a fifth embodiment of the present invention, there is provided a laser induced thermal imaging apparatus including: a substrate stage including a magnet, the acceptor substrate and a donor film being sequentially fed and laminated on the substrate stage, the acceptor substrate having a pixel definition region in which first and second sub-pixels, and two third sub-pixels constituting one pixel, the donor film having an organic light emission layer to be transferred on the pixel definition region; a laser oscillator for irradiating a laser to the donor film; a contact frame adapted to be disposed between the substrate stage and the laser oscillator, including magnetic substance for forming a magnetic force with the substrate stage, and including an opening through which the laser passes; and a contact frame feed mechanism for moving the contact frame in a direction of the substrate stage, wherein the contact frame includes first and second frames; first and second openings are formed at the first and second frames; the first and second sub-pixels are formed at the first opening, and two third sub-pixels are formed at the second opening, the first and second frames are alternately mounted to form an emission layer of an organic light emitting diode.

"According to another aspect of a fifth embodiment of the present invention, there is provided a method for fabricating an organic light emitting diode having an emission layer formed between first and second electrodes by the laser induced thermal imaging apparatus, the method including: placing an acceptor substrate having first and second pixels regions, and two third sub-pixel regions constituting one pixel on a substrate stage having a magnet; placing a donor film having an organic light emission layer to be transferred on the pixel definition region, on the acceptor substrate; adhering a first contact frame having a magnet to a first donor film using magnetic attraction, an opening being formed at the contact frame, a laser for transferring first and second color organic light emission layers passing through the opening; irradiating the laser to the first donor film through the opening of the first contact frame to transfer the first color organic light emission layer to the first sub-pixel region; separating the first contact frame from the first donor film; placing a second donor film having a second color organic light emission layer on the acceptor substrate in place of the first donor film; again adhering the first contact frame to a second donor film using magnetic attraction; irradiating the laser to the second donor film through the opening of the first contact frame to transfer the second color organic light emission layer to the second sub-pixel region; separating the first contact frame from the second donor film, and substituting the first contact frame by a second contact frame, the second contact frame including a magnet, and an opening is formed at the second contact frame, and a laser for transferring a third color organic light emission layer of the third donor film passing through the opening; placing a third donor film having the third color organic light emission layer on the acceptor substrate in place of the second donor film; adhering the second contact frame to the third donor film using magnetic attraction; and irradiating the laser on the third donor film through the opening of the second contact frame to transfer the third color organic light emission layer to two third pixel regions.

"According to an aspect of a sixth embodiment of the present invention, there is provided a laser induced thermal imaging apparatus for forming an emission layer of an organic light emitting diode including: a chamber including a substrate stage and being adapted to receive a contact frame, the substrate stage having a magnet or a magnet material, and the contact frame being adapted to be disposed between the substrate stage and a laser oscillator, and a laser induced thermal imaging is performed in the chamber; the laser oscillator for irradiating a laser to the contact frame and a donor film; and a contact frame feed mechanism for moving the contact frame in a direction of the substrate stage, the contact frame includes a magnet or magnetic substance, first, second, and third contact frames; a first sub-pixel, a second sub-pixel, and third two sub-pixels constituting one pixel, the first opening corresponding to a first sub-pixel region being formed at the first contact frame, the second opening corresponding to a second sub-pixel region being formed at the second contact frame, the third opening corresponding to two third sub-pixel regions being formed at the third contact frame; and the first, second, and third contact frames are alternately mounted to form an emission layer of an organic light emitting diode.

"According to another aspect of a sixth embodiment of the present invention, there is provided a method for fabricating an organic light emitting diode having an emission layer formed between first and second electrodes by the laser induced thermal imaging apparatus, the method including: placing an acceptor substrate having first and second pixels regions, and two third sub-pixel regions constituting one pixel on a substrate stage having a magnet or magnetic substance; placing a donor film having an organic light emission layer to be transferred on the pixel definition region, on the acceptor substrate; adhering a first contact frame having a magnet or magnetic substance to a first donor film using magnetic attraction, an opening being formed at the contact frame, a laser for transferring a first color organic light emission layer passing through the opening; irradiating the laser from a laser oscillator to the first donor film through the opening of the first contact frame to transfer the first color organic light emission layer to the first sub-pixel region; separating the first contact frame from the first donor film, and substituting the first contact frame by a second contact frame, the second contact frame including a magnet or magnetic substance, and an opening is formed at the second contact frame, and a laser for transferring a second color organic light emission layer of the second donor film passing through the opening; placing a second donor film having the second color organic light emission layer on the acceptor substrate in place of the first donor film; adhering the second contact frame to a second donor film using magnetic attraction; irradiating the laser from a laser oscillator to the second donor film through the opening of the second contact frame to transfer the second color organic light emission layer to the second sub-pixel region; separating the second contact frame from the second donor film, and substituting the first contact frame by a second contact frame, the second contact frame including a magnet or magnetic substance, and an opening is formed at the third contact frame, and a laser for transferring a third color organic light emission layer of the third donor film passing through the opening; placing a third donor film having the third color organic light emission layer on the acceptor substrate in place of the second donor film; adhering the third contact frame to a third donor film using magnetic attraction; and irradiating the laser from a laser oscillator to the third donor film through the opening of the third contact frame to transfer the third color organic light emission layer to the third sub-pixel region."

URL and more information on this patent, see: Noh, Sok Won; Lee, Seong Taek; Kim, Mu Hyun; Song, Myung Won; Kim, Sun Hoe; Seong, Jin Wook. Laser Induced Thermal Imaging Apparatus and Fabricating Method of Organic Light Emitting Diode Using the Same. U.S. Patent Number 8623583, filed June 26, 2013, and published online on January 7, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=86&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=4299&f=G&l=50&co1=AND&d=PTXT&s1=20140107.PD.&OS=ISD/20140107&RS=ISD/20140107

Keywords for this news article include: Electronics, Transferrin, Beta-Globulins, Blood Proteins, Acute-Phase Proteins, Light-emitting Diode, Iron-Binding Proteins, Samsung Display Co. Ltd..

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