Patent ID: 6678019
Filing Date: 2004-01-13
Classification: G02B,G02F

Abstract:
A transmission type liquid crystal display device comprising:a liquid crystal display element including a pair of transparent insulating substrates placed to face each other with a gap therebetween, transparent electrodes being formed on inner surfaces of the substrates, and a liquid crystal material injected in the gap; a light source placed on a back side of the liquid crystal display element; and a light diverging element placed on a front side of the liquid crystal display element, wherein the liquid crystal display device satisfies an expression 0.5&LessFullEqual;&Integral;-90&it;Â°90&it;Â°&it;B&it;â€ƒ&it;L&af;(Î¸)Ã—L&it;â€ƒ&it;C&af;(Î¸)Ã—Dif&af;(10&it;Â°,Î¸)&it;&dd;Î¸&Integral;-90&it;Â°90&it;Â°&it;B&it;â€ƒ&it;L&af;(Î¸)Ã—L&it;â€ƒ&it;C&af;(Î¸)Ã—Dif&af;(0&it;Â°,Î¸)&it;&dd;Î¸where BL(&thgr;) is a light emitting angle &thgr;â€”luminance characteristic of the light source, LC(&thgr;) is an incident angle &thgr; to the liquid crystal display elementâ€”transmittance characteristic of the liquid crystal display element in a bright state, and Dif(a, &thgr;) is an incident angle &thgr; to the light diverging elementâ€”transmittance characteristic of the light diverging element at a light receiving angle a.