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BOWTIE GETTER FORMING FOR IMPROVED FIELD EMISSION DISPLAY PACKAGE ASSEMBLY

IP.com Disclosure Number: IPCOM000009000D
Original Publication Date: 1999-Jan-01
Included in the Prior Art Database: 2002-Jul-30
Document File: 3 page(s) / 96K

Publishing Venue

Motorola

Related People

Clay Nelson: AUTHOR

Abstract

A field emission flat panel display utilizes get- tering material to absorb gasses and maintain ade- quate display vacuum after seal. During the seal process the anode and cathode are held in parallel, separated from each other in a seal fixture. The frit frame lies on top of the cathode, and the getters are loaded into retaining tabs on the frit frame. The entire fixture is then loaded into a vacuum sealing oven where it is pumped down to meet the high vac- uum requirement, and is ramped up in temperature. Once the frit sealing temperature has been achieved, the fixture is forced together completing the seal process.

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MO7DROLA Technical Developments

BOWTIE GETTER FORMING FOR IMPROVED FIELD

EMISSION DISPLAY PACKAGE ASSErjlBLY

by Clay Nelson

INTRODUCTION

  A field emission flat panel display utilizes get- tering material to absorb gasses and maintain ade- quate display vacuum after seal. During the seal process the anode and cathode are held in parallel, separated from each other in a seal fixture. The frit frame lies on top of the cathode, and the getters are loaded into retaining tabs on the frit frame. The entire fixture is then loaded into a vacuum sealing oven where it is pumped down to meet the high vac- uum requirement, and is ramped up in temperature. Once the frit sealing temperature has been achieved, the fixture is forced together completing the seal process.

PROBLEM DESCRIPTION

  A cut away view of the pre-seal assembly is shown in Figure 1. It should be noted that the frit is dispensed on the frame, and so the height and width of the frit bead can vary. As the frit bead varies in height, it becomes possible for the getter stack to slide under the glass carrier in the frit frame. Then, when the sealing force is applied, the out of place getter prevents the sealing fixture from closing com- pletely, resulting in broken glass, and/or improper final package height. Figure 2 shows a cut away view of the desired final package assembly.

SOLUTION

  To keep the getters from sliding under the frit frame, we were able to Utilize a bow tie configura- tion to increase getter height, and preve...