Liquid crystal cells – elements and systems – Particular excitation of liquid crystal – Plasma excitation
Patent
1996-03-18
1999-12-14
Dudek, James A.
Liquid crystal cells, elements and systems
Particular excitation of liquid crystal
Plasma excitation
313587, 3151694, G02F 1133
Patent
active
060024569
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a plasma addressed liquid crystal display apparatus adapted for driving liquid crystal by making use of plasma to thereby display an image (pictorial image).
2. Background Art
As an image display apparatus for driving liquid crystal to carry out display of an image (pictorial image), a plasma addressed liquid crystal display apparatus utilizing discharge plasma is disclosed in the Japanese Patent Application Laid Open No. 265931/1992 publication, etc.
The proposed plasma addressed liquid crystal display apparatus comprises, as shown in FIG. 1, a liquid crystal side glass 12 having a plurality of electrodes 11 arranged in parallel to each other, a base (substrate) glass 14 having a plurality of discharge electrodes 13 arranged in parallel to each other and perpendicular to the electrodes 11, a thin glass plate 15 provided between the liquid crystal side glass 12 and the base glass 14, a liquid crystal layer 16 provided between the liquid crystal side glass 12 and the thin glass plate 15, a plurality of barrier ribs 18 formed on the discharge electrodes 13 within a discharge chamber 17 formed between the base glass 14 and the thin glass plate 15, and frit 19 provided so as to seal the discharge chamber 17.
The liquid crystal side glass 12 is flat and non-conductive, and sufficiently transparent from an optical point of view. A plurality of strip-shaped electrodes 11 are formed on one principal surface of the liquid crystal side glass 12, and a liquid crystal layer 16 comprised of nematic liquid crystal, etc. is disposed in a manner in contact with the electrodes 11. In particular, a plurality of the electrodes 11 formed with a predetermined width on the principal surface of the liquid crystal side glass 12 opposite to the base glass 14 are formed by transparent conductive material, e.g., indium tin oxide (ITO), etc., and are transparent from an optical point of view. In addition, these electrodes 11 are disposed in parallel to each other, and extend, e.g., in a vertical direction of the display screen.
The liquid crystal layer 16 is held between the thin glass plate 15 which is a thin dielectric plate and the liquid crystal side glass 12. A liquid crystal cell is formed by. By the liquid crystal side glass 12, the liquid crystal layer 16 and the thin plate glass 15. This thin glass plate 15 functions as an insulating shielding layer between the liquid crystal layer 16 and discharge chamber 17 which will be described later.
On the other hand, the base glass 14 on which a plurality of the discharge electrodes 13 are formed as a strip-shaped electrode and the thin glass plate 15 are adapted so that their peripheries are sealed by frit 19 as the sealing agent. In addition, a space formed between the base glass 14 and the thin glass plate 15 serves as the discharge chamber 17 for producing discharge plasma.
Respective discharge electrodes 13 are equi-distantly disposed on the base glass 14. Moreover, barrier ribs 18 respectively serving as barriers are formed on these discharge electrodes 13 by printing as described later. The discharge chamber 17 is partitioned by the plurality of barrier ribs 18 so that it is divided into respective plasma chambers P.sub.1, P.sub.2 . . . which form independent discharge channels, respectively.
The discharge electrodes 13 formed on the principal surface of the base glass 14 opposite to the liquid crystal side glass 12 are directly formed on the base glass 14 by a conductive paste including, e.g., silver powder, etc. The discharge electrodes 13 are also arranged in parallel to each other, wherein the arrangement direction thereof is the direction perpendicular to the electrodes 11 formed on the previously described liquid crystal side glass 12. Namely, these discharge electrodes 13 are arranged in a horizontal direction with respect to the display screen. Accordingly, respective plasma chambers P.sub.1, P.sub.2 . . . correspond to e.g., respective scanning lines within the display picture on screen.
REFERENCES:
patent: 5214521 (1993-05-01), Kwon et al.
patent: 5221979 (1993-06-01), Kim
patent: 5276384 (1994-01-01), Martin
patent: 5313223 (1994-05-01), Buzak et al.
patent: 5349454 (1994-09-01), Iwama
patent: 5453660 (1995-09-01), Martin et al.
Dudek James A.
Sony Corporation
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