EMBOSSED PLASMA DISPLAY BACK PANEL

• Main Authors: PRABHU, ASHOR, N, PALIT, KALIPADA, HOZER, LESZEK, SREERAM, ATTIGANAL, N
• Format: Patent
• Language: English; French; German
• Published: 30.06.2004
• Edition: 7
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS; CHEMISTRY; ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS; ELECTRICITY; GLASS; JOINING GLASS TO GLASS OR OTHER MATERIALS; METALLURGY; MINERAL OR SLAG WOOL; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS; SURFACE TREATMENT OF GLASS

A plasma display device of the type having a composite back plate including a metal substrate and a ceramic barrier rib structure, is formed using a green ceramic tape which is a combination of two glasses, a primary glass which flows back during firing and a secondary glass that has a relatively high thermal coefficient of expansion. These glasses are combined in proportion to match the thermal coefficient of expansion of the metal substrate. Channels are formed on the inner surface of the back panel by laminating a green ceramic tape to the metal substrate and then soaking the laminated tape in a solvent before embossing the green tape to form the ribs. This soaking step enhances the flow of the green ceramic tape during the embossing process. The ceramic components of the green tape are formulated with a particle size 15 mum or more to enhance particle flow when the green tape is embossed. Electrodes are printed onto one or more of the green ceramic tape layers, by screen printing using a metal emulsion screen, prior to embossing such that the electrode layer covers all or substantially all of the green tape layer and the electrodes are separated by the embossing process. Alternatively, the electrodes are printed onto one or more of the green ceramic tape layers using a conductive ink which may be applied using an ink-jet printing technique. In another alternative, the electrodes are formed from sheets of conductive material and applied to the back panel either before or after the panel is embossed.