US 2019/0196272 A1 · Thin LCD Direct-Lit Backlight with Low Cost Heater

Abstract

A direct-lit LED backlight for a liquid crystal display (LCD) based avionics display unit may include a two-dimensional high density array of mid-power LED units mounted to a circuit card. A diffuser layer for scattering and spreading the luminous output of the LED array throughout the full LCD stack may be airlessly adhered (e.g., without the need for an air gap) to the LED array, and to the LCD stack, by bond layers of thermally conductive transparent optical adhesive. The circuit card may include embedded resistive heaters for conductively heating the LCD stack to optimize performance, or the LCD stack may be heated by the LED array itself. The backlight may include night vision filtering layers similarly and airlessly adhered between the LED array and the LCD stack by the optical bond layers.

Claims20

Dependent claims

A direct-lit backlight for a liquid crystal display (LCD) unit, comprising:

an array of luminous elements configured to generate a luminous output, the array of luminous elements mounted to a substrate in an evenly spaced apart relationship;
drive electronics coupled to a power source, the drive electronics configured to supply power to the array of luminous elements;
at least one diffuser layer configured to scatter the luminous output;
one or more optical bond layers incorporating at least one transparent thermally conductive optical adhesive, the one or more optical bond layers including at least:
a first optical bond layer adhering the diffuser layer to the substrate;
and
a second optical bond layer adhering the diffuser layer to the LCD stack.

4 more elements

Dependencies are inferred from the claim text.

Thin LCD Direct-Lit Backlight with Low Cost Heater

Life of this patent

Thin LCD Direct-Lit Backlight with Low Cost Heater

Life of this patent

Abstract

Claims20