초록 ▼

A background lighting apparatus includes a light entering edge surface around substantially the entire periphery of a highly internally reflecting transparent plate wherein light beams enter from peripheral light sources and travel toward the central portion of the plate and are dispersed and diffus

A background lighting apparatus includes a light entering edge surface around substantially the entire periphery of a highly internally reflecting transparent plate wherein light beams enter from peripheral light sources and travel toward the central portion of the plate and are dispersed and diffused by a diffusion system formed relative to the transparent plate. Uniformity of luminance provided from the background lighting apparatus is enhanced as a whole by increasing the incident quality of the input light beams into the transparent plate while easing the incident directivity of the light beams on the transparent plate with the overall substantial enhancement of luminance produced from the apparatus. Further, the temperature distribution on a liquid crystal panel positioned adjacent to the output surface of the background lighting apparatus is substantially uniform across the panel so that the transmission quality of the liquid crystal material, which is dependent upon ambient temperatures, is made substantially more uniform resulting in significantly higher levels of uniformity in luminance across the display as well as uniformity of displayed colors and gradations thereof emanating from the display panel.

대표청구항 ▼

A background lighting apparatus for an adjoining LCD panel having enhanced luminance and thermal uniformity thereacross comprising: a transparent plate having two major surfaces providing a high level of internal reflection for light below a critical angle, a peripheral edge surface around a perimet

A background lighting apparatus for an adjoining LCD panel having enhanced luminance and thermal uniformity thereacross comprising: a transparent plate having two major surfaces providing a high level of internal reflection for light below a critical angle, a peripheral edge surface around a perimeter of said plate functioning as a light input to the interior of said plate, one of said major surfaces functioning as a light output from said apparatus for light above said critical angle, a distributed diffusion system formed relative to at least the other of said major surfaces to diffuse and reflect light entering the interior of said plate and permit light at or above said critical angle to output through said one major surface, and a fluorescent-type light source configured to uniformly follow said peripheral edge and provide a continuous light input uniformly along said the entire peripheral edge of said plate so that for a required light level input, the amount of light flux is reduced due to the continuity of said light source along said edge permitting the utilization of smaller light source and, correspondingly, providing a reduction in the overall light source heat generated as well as provide even heat transfer distribution across said plate wherein electrical operating characteristics of said adjoining LCD panel are affected evenly thereacross.