Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Reexamination Certificate
2001-09-14
2004-10-19
Tran, Minhloan (Department: 2826)
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
C349S105000, C349S107000, C345S085000, C345S086000, C345S087000, C430S008000, C430S009000, C106S031270
Reexamination Certificate
active
06806925
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is related to a manufacturing method of a liquid crystal display device, particularly to a dyeing method applied to a dyed medium (a medium to be colored, also called “a reception layer for ink”, hereinafter) formed on a color filter substrate thereof prepared for the manufacturing process thereof, ink suitable for the dyeing method, and a dyeing step for supplying the ink to the medium using a ink-jet type printer (an ink-coating apparatus).
2. Description of the Related Art
In a liquid crystal display device having a color image display function, a light shielding film made of material having low optical transmissivity is formed on at least one of a pair of substrates which sandwich a layer formed of liquid crystal composition therebetween, openings are formed in regions of the light shielding film which correspond to pixels, and a layer exhibiting the high transmissivity to light in a given wavelength range compared to the light shielding film is formed at each opening region. The light shielding film which is provided with the openings for light transmission is called a black matrix. Layers which are provided to respective opening regions and allow light in a given range to pass therethrough are called color filters, and a substrate on which these color filters are formed (in many case, a so-called transparent substrate which is made of glass, synthetic regin or the like having the high optical transmissivity and the high electrical insulation) is called a color filter substrate. In the liquid crystal display device having the color image display function, the respective color filters mounted on the color filter substrate served for the liquid crystal display device are classified into a plurality of kinds corresponding to the ranges of wavelength which exhibit the high optical transmissivity. In general, the respective color filters exhibit the high optical transmissivity at any one of three kinds of wavelength ranges which respectively correspond to red, green and blue depending on the three principle colors of light. In other words, on the color filter substrate which is used in the general color liquid crystal display device, at least three kinds of color filters which have colors different from each other are formed.
As one of the manufacturing methods of a color filter substrate, there has been known a coloring resist method which forms a plural kinds of color filters by repeating a so-called photolithography process in which a substrate (eventually constituting a color filter substrate) is coated with a resist made of high-polymer resin material having pigment in a given color dispersed therein, the resist is subjected to an exposure using a photo mask and the resist is developed in accordance with an exposure pattern (resist partially removed from the color filter substrate). Further, as another one of manufacturing methods of a color filter substrate, there has been known a dyeing method in which dyed media (also called “reception layers”) are formed at a plural portions of a substrate and dyeing material such as dyes or pigments of given colors are supplied to respective dyed medium so as to perform coloring.
As described above, the coloring resist method has to repeat the photolithography process for respective colors and hence, there exists a limitation with respect to the manufacturing throughput of the color filter substrates and eventually the manufacturing throughput of liquid crystal display devices for the color image display using such a method. Further, in the color resist method, the resist in which the pigment of a given color is dispersed flows into or is scattered into a pixel region which is disposed close to or adjacent to a pixel region in which the color filter using such a resist is formed (the pixel region in which the another color filter made of the resist in which pigment having color different from the given color is dispersed) so that there is a possibility that an undesirable kind of pigment for another color filter may be mixed into another color filter.
On the other hand, the dyeing method which coats the dyed media on the color filter substrate is classified into several kinds depending on the method (device) which supplies the dye (hereinafter called “dye ink” or simply called “ink”) to the dyed media. As one typical example of the ink supply method, there has been known a technique which is disclosed in Japanese Laid-open Patent Publication 209669/1999 or the like in which a piezoelectric transducer is used and ink is ejected from an ink chamber due to the deformation of the piezoelectric transducer. Further, as another typical example of the ink supply method, there has been a technique which is disclosed in Japanese Laid-open Patent Publication 202124/1999 in which an ink chamber is heated so as to swell bubbles generated in the inside of the ink whereby the ink is ejected. The ink supply devices used in these techniques are respectively described in “Technologies & Materials for Inkjet Printer, 1998.7.31” (published by CMC Ltd., in Japanese), wherein the former is described in “the Eighth Chapter Piezoelectric-type Inkjet Printer” (pages 101-111) and the latter is described in “the Seventh Chapter Thermal Jet Printer” (pages 71-100). In this specification, for the convenience sake, the method for supplying ink to the color filter substrate using the former is called “piezoelectric method” or “electromechanical conversion type inkjet method” and the method for supplying ink to the color filter substrate using the latter is called “thermal jet method”. Further, the color filter substrate manufacturing method which colors the dyed media formed on the color filter substrate by ejecting droplets of ink toward the color filter substrate using a device including the former and the latter is generally called “inkjet method”.
Two examples of the ink supply device adopting the piezoelectric method described on pages 190-191 of “Technologies & Materials for Inkjet Printer” are schematically shown in FIG.
6
A and
FIG. 6B
, while one example of the ink supply device adopting the thermal jet method described on pages 73-75 of the same literature is schematically shown in FIG.
6
C. The ink supply device shown in
FIG. 6A
supplies ink (dye) INK into an ink chamber CHM through an ink supply passage SPP and also supplies the ink INK into a pressure chamber PRC through an orifice ORF which is formed in the ink chamber CHM. At a position which faces the orifice ORF of the ink chamber CHM in an opposed manner, a nozzle NOZ having an opening smaller than the orifice ORF is disposed and the ink INK which is supplied into the ink chamber CHM is ejected to the dyed media of the color filter substrate through the nozzle NOZ. However, since the opening of the nozzle NOZ is small, usually, there is no possibility that the ink INK which is supplied into the ink chamber CHM through the ink supply passage SPP is ejected or leaked from the opening of the nozzle NOZ.
On the other hand, a plate-like piezoelectric crystal element PZT is arranged at a side opposite to the ink chamber CHM of the pressure chamber PRC. The piezoelectric crystal element PZT shown in
FIG. 6A
is in the state that a given voltage is not applied to the piezoelectric crystal element PZT. When the given voltage is applied to the piezoelectric crystal element PZT, a central portion thereof is deflected to the left side in
FIG. 6A
so as to expand the volume of the pressure chamber PRC. That is, by applying the given voltage to the piezoelectric crystal element PZT, the ink flows into the expanded pressure chamber PRC. Thereafter, when the applying of the given voltage to the piezoelectric crystal element PZT is stopped, the piezoelectric crystal element PZT restores the shape shown in the drawing and the volume of the pressure chamber PRC also returns to the volume shown in the drawing and hence, the ink which flows into the pressure chamber PRC at the time of the expansion of the pressure chamber PRC returns
Ishii Akira
Matsuyama Shigeru
Shimizu Miyo
A. Marquez, Esq. Juan Carlos
Erdem Fazli
Fisher Esq. Stanley P.
Hitachi , Ltd.
Reed Smith LLP
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