Plane-shaped lighting device and a display using such a device

Details Plane-shaped lighting device and a display using such a device Plane-shaped lighting device and a display using such a device

1996-05-23

1998-07-28

Patel, Ashok

Electric lamp and discharge devices

With luminescent solid or liquid material

Solid-state type

313113, 362 27, 362 31, 362800, 362812, F21V 700

Patent

active

057866651

ABSTRACT:
A plane-shaped lighting device has a light-directing plate and a light source that is placed in contact with or in the proximity of the light-incident surface of the light-directing plate, and the light source is constituted of a plurality of LED lamps each of which has an LED chip for emitting light and a semispherical lens for directing the light from the LED chip into the light-directing plate. Here, the distance from the LED chip to the top of the semispherical lens is set to be 1.8 times as long as the radius of curvature of the semispherical lens. This arrangement allows the light emitted from the LED chip to be efficiently incident on the light-incident surface of the light-directing plate, thereby improving the light-incidence efficiency to the light-directing plate. Further, the application of this plane-shaped lighting device to display devices makes it possible to improve the efficiency of light utilization, and consequently to provide thinner display devices with high visibility.

REFERENCES:
patent: 4473866 (1984-09-01), Davis
patent: 5408388 (1995-04-01), Kobayashi et al.
patent: 5641219 (1997-06-01), Mizobe

Affiliated with

Also associated with

Rating

Plane-shaped lighting device and a display using such a device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Plane-shaped lighting device and a display using such a device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Plane-shaped lighting device and a display using such a device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-25537