Claims
- 1. A touch screen for determination of a touch position with a resolution of less then one inch, comprising:
a cathode ray tube (CRT) having a display region with an exterior and an interior surface; a transparent conductive coating placed directly on said exterior surface of said CRT; and a plurality of electrodes placed directly on said exterior surface of said CRT, in the absence of electrodes placed on said interior surface.
- 2. A touch screen, as claimed in claim 1, wherein said plurality of electrodes are formed from materials selected from the group consisting of silver epoxies and a mixture of silver and low-temperature-melting glass.
- 3. A touch screen, as claimed in claim 1, wherein said touch screen is provided by a process that includes only a single vacuum step.
- 4. A method of making a touch screen apparatus for detecting touch at a preselected location on a touch screen surface with a resolution of less than one inch, comprising:
providing a CRT, having a front surface; applying a plurality of bar electrodes directly to the front surface; depositing a transparent conductive coating to the front surface to provide an electrical path between the bar electrodes; and applying a transparent protective coating over the conductive coating.
- 5. The method of claim 4 wherein the plurality of bar electrodes are made of a glass and silver compound.
- 6. The method of claim 4, wherein the conductive coating is made of silver epoxy.
- 7. The method of claim 4, wherein the protective coating is made of indium.
- 8. A method, as claimed in claim 4, wherein said steps of depositing a transparent conductive coating and said step of applying a transparent protective coating are conducted in a vacuum chamber.
- 9. A method, as claimed in claim 4, wherein only a single vacuum process is needed to perform the method of making a touch screen apparatus.
- 10. A method, as claimed in claim 4, wherein said method of making a touch screen apparatus is performed in the absence of substantially modifying the size or shape of said bar electrodes after said step of applying a plurality of bar electrodes.
Parent Case Info
[0001] This is a division of U.S. application Ser. No. 08/294,227, filed Aug. 22, 1994.
Divisions (1)
|
Number |
Date |
Country |
Parent |
08294227 |
Aug 1994 |
US |
Child |
10279300 |
Oct 2002 |
US |