5,697,175, to Schwartz, discloses a low power illuminated sign that is particularly adapted for use with common EXIT signs over doorways. The back of each sign comprises a reflector with a series of cavities with curved surfaces. Each cavity corresponds to a letter and background area in the sign. LEDs are mounted in the center of the cavities to illuminate the letters or background area. The LEDs are provided on a separate perpendicular circuit board or on a central projection formed in the bottom of the cavities, with light from the LEDS directed outward. The letters and background area of the sign are illuminated by light reflecting forward from the curved surfaces of the cavities, so that the only visible light is from the illumination of the cavities.
TheIt has been claimed that the nearby earthworks of Ring Stones Camp (), Twist Castle () and Beadle Hill () are of Roman origin, but little supporting archaeological information has been published.

Following the Roman period, the area became part of the kingdom of Rheged, and then the kingdom of Northumbria. Local place names Padiham and Habergham show the influence of the Angles, suggesting that some had settled in the area by the early 7th century; some time later the land became part of the hundred of Blackburnshire.

There is no definitive record of a settlement until after the Norman conquest of England. In 1122 a charter granted the church of Burnley to the monks of Pontefract Abbey. In its early days, Burnley was a small farming community, gaining a