Fluorescent lamp and image display apparatus

摘要

To obtain effective luminance and light efficiency while avoiding discharge, it is necessary to sufficiently increase a current luminous efficiency of gas and an electron emission efficiency of an electron source. In a fluorescent lamp, an anode electric field is increased by setting a pressure of a noble gas or a molecular gas enclosed to 10 kPa or higher, setting an anode voltage to 240 V or lower, and setting a substrate distance to 0.4 mm or smaller. Furthermore, the resulting effect that the current luminous efficiency is increased in proportion to the electric field is used. Also, by applying a MIM electron source having an electron emission efficiency exceeding 10% as an electron source, a non-discharge fluorescent lamp having a light emission luminance equal to or larger than 104 [cd/m2] and a light emission efficiency equal to or larger than 120 [lm/W] is achieved.

主权项

1. A fluorescent lamp comprising: a front substrate and a back substrate facing each other; a container configured of walls surrounding the front substrate and the back substrate; an electron source placed on a front substrate side of the back substrate and emitting hot electrons; a fluorescent material placed on a back substrate side of the front substrate, absorbing ultraviolet rays, and performing visible light emission; a noble gas or a molecular gas enclosed in the container; and electrodes provided on the front substrate and the back substrate, wherein the hot electrons emitted into the noble gas or the molecular gas are collected by applying an anode voltage between the electrodes, and a current luminous efficiency obtained by dividing a luminance L of the visible light emission by an anode current density is proportional to a value of an anode electric field obtained by dividing the anode voltage by a substrate distance between the front substrate and the back substrate, wherein the noble gas or the molecular gas has a pressure equal to or higher than 10 kPa, the anode voltage is equal to or lower than 240 V, and the substrate distance is equal to or smaller than 0.4 mm.