AC plasma panel shift with intensity control

• US 4,513,281 A
• Filed: 04/05/1982
• Issued: 04/23/1985
• Est. Priority Date: 04/05/1982
• Status: Expired due to Fees

• Current Assignee: Bell Telephone Laboratories, Inc. (Nokia Corporation)
• Original Assignee: AT&T, Inc.
• Inventors: Ngo, Peter D. T.
• Primary Examiner(s): Curtis, Marshall M.
• Application Number:
  US06/365,460
• Time in Patent Office: 1,114 Days
• Field of Search: 340/768, 340/769, 340/772, 340/773, 340/701-704, 340/713, 340/714, 340/781
• US Class Current: 345/72
• CPC Class Codes: G09G 2320/0228 Increasing the driving margin in plasma displays
• CPC Class Codes: G09G 3/2003 Display of colours specific for liquid crystal displays G09G3/3607
• CPC Class Codes: G09G 3/288 using AC panels
• CPC Class Codes: H04N 9/12 Picture reproducers H04N9/11 takes precedence

Abstract

There is disclosed an ac plasma panel having gray tone and color control. The plasma panel is constructed using a matrix of discharge sites, each site associated with one or more migration sites. The migration sites, in turn, have phosphor areas in conjunction with an electrical field controlling conductor. During the ionization of the plasma gas a selective electrical field is established between a discharge site and an adjacent migration site and the electrons from the gas ionization are free to migrate to the phosphor area of the screen in accordance with the magnitude of the electrical signals on the control conductor.

Claims

1. A plasma panel having a plurality of discharge sites, each site having opposing dielectric surfaces and each site operable for ionizing the plasma gas at a particular panel location between said surfaces, said ionization including the periodic generation of an electron charge cloud,

characterized in that said panel also includes at least two migration sites associated with each said discharge site, each said migration site located along the same surface as said associated discharge site and each said migration site including means for independently and selectively attracting electrons from said associated discharge site during said electron charge cloud generation interval, each said migration site further including means responsive to the direct impingement of said attracted electrons thereupon for emitting light rays under control of said selectively attracted electrons, and

means for removing said impinged electrons from said migration site.

2. The invention set forth in claim 1 wherein the intensity of said emitted light rays is controllable by said selective attracting means.

3. A gas discharge panel having a plurality of discharge locations for ionizing the gas of said panel at sites thereon each said site bounded by dielectric substrates and wherein electrons generated at each said ionization move across the region bounded by said substrates,

said discharge sites having associated therewith at least one light emitting site disposed laterally along a single substrate, each said light emitting site operable for providing to a viewer light rays when impacted by electrons generated at said associated discharge site, and

each said discharge site having associated therewith means for independently and selectively establishing an electric field potential between said discharge site and said adjacent light emitting site, said electric field potential causing the migration of available electrons from said discharge site to said associated laterally displaced light emitting sites, whereby said electrons directly impact said light emitting site.

4. The invention set forth in claim 3 wherein each said light emitting site includes phosphor which provides a distinct color when impacted by said electrons,

and wherein said selective establishing means includes at least one electrical conductor placed in proximity to said plasma gas and to individual phosphor sites so as to remove said electrons which impact said phosphor site from the region between said substrates.

5. The invention set forth in claim 4 wherein said electrical conductors are arranged in matrix fashion with each conductor controlling electron migration to more than one individual phosphor site.

6. An ac plasma panel having an envelope within which there is contained an ionizable gas, a plurality of row conductors spaced apart along one surface of said envelope,

a plurality of column conductors orthogonal thereto spaced apart along an opposing surface of said envelope, said row and column conductors forming a matrix of sites for the ionization of the gas between said electrodes at said sites,

discharge areas disposed along one surface of said envelope, said discharge areas adapted to emit light rays when struck by electrons,

at least two control conductors spaced apart along said surface containing said discharge areas, said control conductors adapted for receiving electrical signals having a controllable magnitude and for creating, with respect to either a row or column conductor, an electric field for causing the migration of electrons from said ionization sites to selected discharge areas during said ionization of said gas in accordance with the intensity of the electric field created at any given time.

7. The invention set forth in claim 6 wherein each said discharge area includes at least one phosphor area associated with a viewing surface of said envelope, said phosphor area being within at least one of said created electric fields.

8. A color ac plasma system, said system including an ac plasma panel having an envelope within which there is contained an ionizable gas, a plurality of row conductors spaced apart along one surface of said envelope,

a plurality of column conductors orthogonal thereto spaced apart along an opposing surface of said envelope said row and column conductors forming a matrix of sites for the ionization of the gas between said electrodes at said sites,

phosphor discharge areas disposed along one surface of said envelope, said discharge areas adapted to emit light rays when struck by electrons, and

control conductors spaced apart along said surface containing said phosphor discharge areas, said control conductors adapted for receiving electrical signals having a controllable magnitude and for creating, with respect to either a row or column conductor, an electric field for causing the migration of electrons from said ionization sites to selected phosphor discharge areas during said ionization of said gas in accordance with the intensity of the electric field created at any given time.

9. The invention set forth in claim 8 further comprising means for selectively controlling said electron migration one row at a time.

10. The invention set forth in claim 8 wherein said selective controlling means includes means for preionizing said gas at those sites where electron migration is not desired.