Patent ID: 7903202

Claim:
A liquid crystal display device comprising: a liquid crystal display panel; a backlight that irradiates the liquid crystal display panel with illuminating light; an optical sheet that is disposed between the liquid crystal display panel and the backlight; and a frame that houses the liquid crystal display panel and the backlight, wherein the backlight includes a cold cathode fluorescent lamp, the cold cathode fluorescent lamp includes a transparent glass tube inside of which a noble gas and mercury are enclosed, a pair of opposing cold cathodes that are enclosed and disposed in both end portions of the glass tube, a pair of electrical power lead-in wires, one end of each of which is connected to the cold cathodes and the other end of each of which is hermetically sealed outside the glass tube and is led outside the glass tube, a fluorescent substance film that is formed on an inner wall surface of the glass tube, the fluorescent substance film includes uneven portions in a film surface thereof, and the uneven portions in the film surface of the fluorescent substance film include a concave portion and convex portion which are continuous and which extend along at least one of a circumferential direction and a tube axis direction of the inner wall surface of the glass tube.