Flexible led backlighting circuit
AssigneeVisteon Global Technologies, Inc.
InventorsPaul F. L. Weindorf, David R. Anderson
Life of this patent
Estimating the term…
Abstract
A flexible circuit board mounted with top-light LEDs and LED control circuits provides a convenient and space efficient way to backlight an LCD. The flexible circuit board may have multiple tabs that are folded such that the top-light LEDs provide light into a light pipe from multiple directions. The top-light LEDs and LED control circuits may be located on the same side of the flexible circuit board for improved cost savings and manufacturability.
Claims26
A light emitting diode (LED) device, comprising:
- a light emitting diode;
- a light emitting diode drive circuit;
- a flexible circuit board having a tab region;
- wherein the light emitting diode and the light emitting diode drive circuit are mounted on a first side of the flexible circuit board and wherein the light emitting diode is mounted on the tab region and the tab region is folded such that the light emitting diode emit light toward a center region of the flexible circuit board.
A liquid crystal display (LCD) device, comprising:
- a light pipe;
- a light emitting diode;
- a light emitting diode control circuit;
- a flexible circuit board having a tab region;
- wherein the light emitting diode and the light emitting diode control circuit are mounted on the tab region and the tab region is folded such that the light emitting diode emit light into the light pipe;
- a light extracting surface located near a first side of the light pipe;
- a diffuser located near a second side of the light pipe, where the first and second sides are opposite each other;
- a reflective polarizer located above the diffuser;
- and
- a liquid crystal display located above the reflective polarizer;
- wherein the light pipe emits light that passes through the diffuser, the reflective polarizer, then the liquid crystal display.
A light emitting diode (LED) device comprising:
- a top lighting light emitting diode;
- a light emitting diode drive circuit;
- a flexible circuit board having a tab region;
- wherein the tab region of the flexible circuit board is folded at substantially a right angle relative to a surface of a center region of the flexible circuit board and the light emitting diode is mounted on a first side of the tab region and the light emitting diode drive circuit is mounted on a second side of the tab region.
Dependencies are inferred from the claim text.