Fluent material handling – with receiver or receiver coacting mea – Processes
Reexamination Certificate
2002-12-26
2004-11-02
Douglas, Steven O. (Department: 3751)
Fluent material handling, with receiver or receiver coacting mea
Processes
C349S149000, C438S029000, C438S166000
Reexamination Certificate
active
06810919
ABSTRACT:
TECHNICAL FIELD
The present invention relates to manufacturing method for a display device, a display device, manufacturing method for an electronic apparatus, and an electronic apparatus.
BACKGROUND ART
In recent years, a color display device in which a functional layer made from a functional member is sandwiched between a pair of electrodes and, in particular, an organic electro-luminescence (hereinafter called EL) display device using a functional member such as an organic illuminating member are developed by employing a patterning method for the functional member in an ink jet method in which the functional member such as organic fluorescence member is liquefied so as to be injected on a base member.
In the patterning method for the functional member explained above, a bank section is formed around a pixel electrode made from, for example, ITO formed on a base body, and next, the pixel electrode and a part of the bank section neighboring the pixel electrode are processed lyophilically and the rest of the bank section is processed to be made volatile, consequently, a composition which includes members contained in the functional layer is injected in approximately center of the pixel electrode so as to be dried; thus, the functional layer is formed on the pixel electrode.
In such a conventional method, if the injected composition overflows from the bank section, it does not occur that the injected composition is repelled at a region in the bank section which is processed to be water-repellant and flows on the other neighboring pixel electrodes; thus, it is possible to performing a patterning operation accurately.
However, in the conventional method, the composition which is injected spreads from a center of the pixel electrode toward a periphery therearound uniformly; thus, the injected composition hardly spreads to a part of the bank section which is processed to be lyophilic. Therefore, there is a case in which the uniformity in the functional layers cannot be realized among the pixel electrodes. It is considered that the reason for this is because a part of the bank section which is processed to be lyophilic is a very small area around the pixel electrode; therefore, the composition does not spread due to factors such as surface tension.
DISCLOSURE OF INVENTION
The present invention was made in consideration for the above situation. An object of the present invention is to provide a display device and manufacturing method therefore which can realize a superior display quality without causing non-uniformity in the functional layer per each pixel electrode.
In order to achieve the above object, the present invention employs the following structures.
The manufacturing method for a display device according to the present invention is characterized in that the manufacturing method for a display device has a bank section between functional layers formed on electrodes by forming a bank section around a plurality of electrodes formed on a base body and forms the functional layers on each of the electrodes by injecting a composition from a plurality of nozzles, a nozzle arrays where a plurality of the nozzles are disposed scan on the base body in a diagonal manner in a main scanning direction, and liquid drops of the compositions which are initially injected for each functional layer are injected so as to contact at least a part of the bank section.
According to such a manufacturing method for a display device, the liquid drops of the composition which are initially injected for each functional layer contact at at least a part of the bank section and the liquid drops are transported from the bank section to a surface of the electrode; therefore, it is possible that the liquid drop of the composition is preferentially applied around the electrode uniformly. Thus, it is possible to form the functional layer in approximately uniform thickness.
Also, the manufacturing method for a display device according to the present invention is characterized in that a region which is processed to be lyophilic and a region which is processed to be water-repellant are formed in the bank section, and the liquid drop of the composition contacts the water-repellant region.
By such manufacturing method for the display device, the liquid drops of the composition contacts a region of the bank section which is processed to be lyophilic; thus, it is possible that the liquid drops can be transported from the bank section to a surface of the electrode quickly; thus, it is possible to preferentially spread the liquid drops of the composition around the electrode quickly.
Also, the manufacturing method for a display device according to the present invention is characterized in that the bank section is formed by a first bank layer which is processed to be lyophilic and a second bank layer which is processed to be water-repellant, and the first bank layer is formed so as to overlap a part of the electrode.
According to such manufacturing method for a display device, the first bank layer which is processed to be lyophilic is formed to overlap a part of the electrode; the composition spreads on the first bank layer sooner than on the electrode. Thus, it is possible to apply the composition uniformly.
Next, the manufacturing method for a display device according to the present invention in which functional layers are formed on each of a plurality of electrodes formed on a base body and bank sections are provided between the functional layers is characterized in comprising steps of bank section forming step for forming the bank sections so as to overlap a part of the electrode, lyophilizing step for processing at least a part of the electrodes to be lyophilic, water-repelling step for processing a part of the bank sections to be water-repellant, functional layer forming step for forming at least a functional layer on each of the electrode by injecting the compositions from a plurality of the nozzles, and facing electrodes forming step for forming facing electrodes on the functional layer. In the functional layer forming step, while nozzle arrays where a plurality of the nozzles are disposed scan on the base body in a diagonal manner in a main scanning direction, the liquid drops of the compositions which are initially injected for each functional layer are injected so as to contact at least a part of the bank section.
According to such manufacturing method for a display device, the liquid drops of the composition which are initially injected for each functional layer contact at at least a part of the bank section; thus, the liquid drops are transported from the bank section to a surface of the electrodes. Therefore, it is possible to preferentially apply the liquid drops of the compositions around the electrode uniformly. Therefore, it is possible to form the functional layer in a uniform thickness.
Also, the manufacturing method for a display device according to the present invention is characterized in that the bank section is formed by a first bank layer which is processed to be lyophilic in the lyophilizing step and a second bank layer which is processed to be water-repellant in the water-repellant step, and the first bank layer is formed so as to overlap a part of the electrode.
According to such manufacturing method for a display device, the first bank layer which is processed to be lyophilic is formed to overlap a part of the electrode; therefore, the composition spreads on the first bank layer sooner than on the electrode. Therefore, it is possible to apply the composition uniformly.
Also, the manufacturing method for a display device according to the present invention is characterized in that the functional layer includes at least a positive hole implantation/transportation layer.
Also, the manufacturing method for a display device according to the present invention is characterized in that the functional layer includes at least an illuminating layer.
According to such manufacturing method for a display device, the functional layer includes a positive hole implantation/transportation layer or an illuminati
Kimura Hideyuki
Seki Shun-ichi
Yamamoto Naoki
Douglas Steven O.
Oliff & Berridg,e PLC
Seiko Epson Corporation
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