US 11,770,884 B2Granted

Daisy-chained connected light emitting diode devices for an automotive direct backlight system

AssigneeDominant Technologies (Singapore) Pte Ltd

InventorsEunGu Kim, Eng Wah Tan, Kim Poh Chow

Life of this patent

Estimating the term…

Loading patent…

Abstract

Daisy-chained connected light emitting diode (LED) devices for an automotive direct backlight system are presented herein. Such system can include a group of LED devices communicatively coupled with respective LED devices of the group of LED devices in a daisy-chained manner via serial communication interfaces between the respective LED devices. A host device of the system is directly connected, via a serial peripheral interface, to a foremost device of the respective LED devices, and is communicatively coupled, via the foremost device, to successive devices of the respective LED devices in the daisy-chained manner. The host device synchronizes generation of light by the respective LED devices based on defined timing information, and sends, via the foremost device, respective optical and electrical characteristic data to each of the LED devices to facilitate modification, via LED drivers of the LED devices, of operating characteristics of respective LED chips of the LED devices.

Claims20

Dependent claims

A liquid crystal display (LCD) backlight system, comprising:

a group of light emitting diode (LED) devices communicatively coupled with respective LED devices of the group of LED devices in a daisy-chained manner via respective serial communication interfaces between the respective LED devices, wherein each LED device of the group of LED devices comprises a stand-alone package comprising a group of LED drivers and a group of LED chips, wherein respective LED drivers of the group of LED drivers of the LED device are electronically coupled to respective LED chips of the group of LED chips of the LED device and modify LED operating characteristics of the respective LED chips of the LED device to facilitate maintenance of a defined homogeneity of respective LED operating characteristics of the group of LED devices, wherein the respective LED operating characteristics comprise the LED operating characteristics;
and
a host device that is directly connected, via a serial peripheral interface, to a foremost device of the group of LED devices, wherein the host device is communicatively coupled, via the foremost device, to successive devices of the respective LED devices in the daisy-chained manner using the serial peripheral interface, wherein the host device synchronizes generation of light by the group of LED devices based on defined timing information, wherein the host device sends, via the foremost device, optical and electrical characteristic data to the LED device to facilitate modification, based on the optical and electrical characteristic data via the group of LED drivers of the LED device, of the LED operating characteristics of the respective LED chips of the LED device to facilitate the maintenance of the defined homogeneity of respective LED operating characteristics of the group of LED devices, and wherein the respective LED devices comprise respective temperature compensation components that are electrically coupled to respective red LED chips of the group of LED devices to facilitate maintenance of a defined uniformity of optical characteristics of the group of LED devices over changes in temperature of the group of LED devices.

A light emitting diode (LED) device of a group of LED devices of a liquid crystal display (LCD) backlight system, comprising:

a memory device;
a group of LED chips;
a temperature compensation component that is electrically coupled to a red LED chip of the group of LED chips to facilitate maintenance of a defined uniformity of optical characteristics of the group of LED devices over changes in temperature of the group of LED devices;
and
a group of LED drivers, wherein the LED drivers are electronically coupled to respective LED chips of the group of LED chips and modify respective LED chip operating characteristics of the respective LED chips to facilitate a defined homogeneity of respective operating characteristics of the group of LED devices, wherein the group of LED devices are communicatively coupled with respective LED devices of the group of LED devices in a daisy-chained manner via respective serial communication interfaces between the respective LED devices, wherein the LED device receives, via a foremost device of the group of LED devices, optical and electrical characteristic data from a host device of the LCD backlight system and stores the optical and electrical characteristic data in the memory device, wherein an LED driver of the group of LED drivers modifies, based on the optical and electrical characteristic data, LED chip operating characteristics of the respective LED chip operating characteristics corresponding to an LED chip of the group of LED chips to facilitate the defined homogeneity of respective operating characteristics of a group of LED devices, and wherein the host device synchronizes generation of light by the group of LED devices based on defined timing information.

2 more elements

Dependencies are inferred from the claim text.