Multi-color display lighting by led
AssigneeDelco Electronics Corporation
InventorsRaymond Lippmann, Michael John Schnars, James Edward Nelson, Mark James Miller
Life of this patent
Estimating the term…
Abstract
An LCD display is backlit by a main light pipe with LEDs of a first color along one edge or opposed edges which uniformly flood the display with the first color, and with an LED of a second color coupled by a second light pipe to another edge to introduce light to local areas of the main light pipe. Filters of the second color over the local areas are illuminated by the second color LED. Prismatic sheets between the main light pipe and the LCD aid in the uniform distribution of the first color and improve display brightness by directing light toward the operator's eyebox.
Claims12
A backlift multi-color display comprising:
- a display device having a first area to be illuminated in a first color and a second area to be illuminated in a second color;
- a light pipe behind the display device for back lighting the device;
- a first light source comprising at least one light emitting diode edge lighting the light pipe for backlighting the whole display with light of the first color to thereby illuminate the first area;
- a filter of the second color covering the second area to filter out light of the first color;
- and
- a second light source comprising at least one light emitting diode for admitting light of the second color to the light pipe in the region of the second area to thereby locally illuminate the second area with the second color.
A backlit multi-color display comprising:
- a liquid crystal display device having a first area to be illuminated in a first color and a second area to be illuminated in a second color;
- a light pipe behind the display device for back lighting the device;
- a first light source comprising at least one light emitting diode edge lighting the light pipe for backlighting the whole display with light of the first color to thereby illuminate the first area;
- a filter of the second color covering the second area to filter out light of the first color;
- and
- a second light source comprising at least one light emitting diode emitting the second color for edge lighting the light pipe in the region of the second area to thereby locally illuminate the second area with the second color.
Dependencies are inferred from the claim text.