Abstract: A backlight uses an array of red, green, and blue LEDs in a mixing chamber. The mixing chamber has reflecting surfaces and a top opening for illuminating LCD layers. The LEDs are arranged in clusters of red, green, and blue LEDs, where there are at least two types of clusters used in the backlight for improved color uniformity across the LCD screen. Examples of a set of two clusters are RGBBGR with BGRRGB, and GRBRG with RGBGR. In one embodiment, clusters of one type form alternate rows in the array, and clusters of the other type form interleaved rows. In another embodiment, the cluster types in a row alternate, and the cluster types in a column alternate like a checkerboard to improve color uniformity. In one embodiment, there is an odd number of rows so that the same cluster type will be at the four corners of the array. Currents to the red, green, and blue LEDs adjust the white point of the display.

Abstract: A system for maneuvering and hanging articles on rails. The system is operable to select one or more hanging articles, disengage their hooks from the rails, reposition them, and re-hang them in a new position on the rails. The system includes a cart for lateral movement upon a set of rails, the cart having wings for lifting hanging articles off the rails and setting hanging articles onto the rails. The cart has a lifting mechanism, which can be lowered so as to drop hanging articles down to a work area or to raise the hanging articles for placement upon the rails. The system may be employed in a greenhouse for moving hanging baskets of plants.

Abstract: A system for maneuvering and hanging articles on rails. The system is operable to select one or more hanging articles, disengage their hooks from the rails, reposition them, and re-hang them in a new position on the rails. The system includes a cart for lateral movement upon a set of rails, the cart having wings for lifting hanging articles off the rails and setting hanging articles onto the rails. The cart has a lifting mechanism, which can be lowered so as to drop hanging articles down to a work area or to raise the hanging articles for placement upon the rails. The system may be employed in a greenhouse for moving hanging baskets of plants.