A new design for FED envelope, which is composed of a box‐shaped front glass, sheet‐like rear glass and metal members, has been devised. This structure design is effective for reducing tensile stress induced by vacuum at the sealing portion. Also, a new glass composition, a new physical tempering method and a lead‐free, hermetic sealing material have been developed. As a result, a novel lightweight, spacer‐free panel structure for FED has been developed by integrating these new technologies.

A hermetic‐sealing material for FED composed of thermosetting polyimide and inorganic filler has been developed. This material enables us to seal at a temperature around 350 °C in nitrogen atmosphere and shows superior performance suitable for glass‐to‐glass and glass‐to‐metal sealing.

As a result of the pursuit in strengthening shallow glass bulbs, a highly strengthened glass funnel has been developed by introduction of a new chemical tempering technology. The integrated technology based on the chemical tempering and previously mentioned innovations can achieve the competence to reduce dramatically the weight of the glass bulb for a wide deflection angle CRT by 45%.

Abstract— A new design for an FED envelope, composed of box‐shaped front glass, sheet‐like rear glass, and metal members, has been devised. This design structure is effective in reducing tensile stress induced by vacuum at the sealing points. Also, a new glass composition, a new physical tempering method, and a lead‐free hermetic sealing material have been developed. As a result, a novel lightweight spacer‐free panel structure for FEDs has been developed by integrating these new technologies. It will assist in maximizing the essential advantages of FED such as high image quality, high reliability, and low cost.

Abstract— An hermetic‐sealing material for FEDs composed of thermosetting polyimide and glass fiber, has been developed. The main backbone and end‐capping material of polyimide were investigated to satisfy both high Tg and high flowability. A thermosetting function, 4‐phenylethynylphthalic anhydride (PEPA), was used as the end‐capping material. The fracture of a rigid and softening structure was optimized in the main polymer structure. The obtained polyimide demonstrated both a high Tg (265°C) and low viscosity (98 Pa‐sec at a sealing temperature of 350°C). In order to improve the gas permeability and the mechanical and thermal characteristics of the sealing material, a mixture of various types of ceramic fillers and polyimide has been investigated, and glass fiber was adopted. When 30 wt.% of glass fiber was combined when the developed polyimide, the Ar permeability and coefficient of thermal expansion of the sealing material decreased to below one‐half of the base polyimide. This material enables us to seal at a temperature of about 350°C in nitrogen atmosphere and shows superior performance suitable for glass‐to‐glass sealing.