METHOD OF PRODUCING FLUORESCENCE SUBSTANCE SUSPENSION, FLUORESCENT LAMP, BACKLIGHT UNIT, DIRECTLY-BELOW TYPE BACKLIGHT UNIT AND LIQUID CRYSTAL DISPLAY UNIT

摘要

A method of producing fluorescence substance suspension to be applied onto the inner surface of a fluorescent lamp-use glass tube, and a fluorescent lamp produced by using the fluorescence substance suspension. The method comprises the step of mixing a mixture (38) of a small amount of solvent (32) containing a thickener and fluorescence substance powder (30), and the step of adding a solvent (40) containing a thickener and a binder and a metal compound coat agent (42) to the mixture and agitating them. The fluorescent lamp has a fluorescence substance film formed by applying the fluorescence substance suspension produced by the above method onto the inner surface of a glass tube, and drying and firing it. Since this method has the mixing step, the arrangement of fluorescence substance particles in a fluorescence substance film finally formed is dense and a contact area between fluorescence substance particles and the glass tube's inner surface is larger, whereby the fluorescence substance film is not likely to peel off. Since fluorescence substance particles are coated with a metal compound, a reaction with sodium contained in the glass tube is prevented, making the fluorescence substance difficult to deteriorate.