# US 8,783,895 B2 · LED bar

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- Number: US 8,783,895 B2
- Document ID: US8783895B2
- Status: Granted
- Kind: B2
- Application number: 13/469,549
- Filed: 2012-05-11
- Published: 2012-09-20
- Granted: 2014-07-22
- Earliest claimed: 2007-09-05
- Assignees: Martin Professional A/S
- Applicants: Allan Pedersen; Xia Chen; Guohui Li; Chen Liang
- Inventors: Allan Pedersen; Xia Chen; Guohui Li; Chen Liang
- Web page: https://patentgrep.com/patent/US8783895B2

## CPC

- F21V 29/507: of means for protecting lighting devices from damage, e.g. housings
- F21S 4/28: rigid, e.g. LED bars
- F21S 10/02: changing colors {(F21S10/002 - F21S10/007, F21S10/04 take precedence)}
- F21V 13/04: the elements being reflectors and refractors {(for vehicle rear lights F21S43/40)}
- F21V 23/06: the elements being coupling devices {, e.g. connectors}
- F21V 29/74: with fins or blades
- F21V 29/83: the elements having apertures, ducts or channels, e.g. heat radiation holes
- H05B 45/00: Circuit arrangements for operating light-emitting diodes [LED]
- H05B 45/20: Controlling the colour of the light
- F21V 21/30: Pivoted housings or frames
- F21V 31/03: with provision for venting {(for vehicle head lights F21S45/33; for vehicle rear lights F21S41/192)}
- F21Y 2103/10: comprising a linear array of point-like light-generating elements
- F21Y 2115/10: Light-emitting diodes [LED]
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21S: NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- F21Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED

## Abstract

An LED device in which LED groups are located on a pixel board has calibration data for each LED stored both electrically and mechanically close to the actual LED. Preferably, each LED group has a number of LEDs of different colors on the pixel board, being electrically connected to a color controller. The color controller is connected to a power supply, and the pixel board has a memory circuit having the LED calibration data related to the LEDs stored therein. The color controller controls LEDs for generating light based on the LED calibration data stored in the memory circuit on said pixel board. Preferably, at least one of the LEDs is formed on a chip that contains the memory circuit for storing the calibration data.

## Claims

### Claim 1

LED device comprising a number of LED groups, each LED group comprising a number of LEDs on a pixel board, said LEDs having different colors and being electrically connected to a color controller, wherein said color controller is connected to a power supply, and wherein said pixel board is separated from said color controller and comprises a memory circuit having LED calibration data related to said LEDs stored therein and wherein the power supply is located on a main circuit board and the color controller is located on a daughter circuit board, and wherein the daughter circuit board is electrically and mechanically connected to the main circuit board in a manner enabling replacement or exchange of the daughter circuit board independent of the main circuit board.

### Claim 2 (depends on 1)

LED device according to claim 1, wherein said color controller is adapted to control said LEDs for generating light based on said LED calibration data stored in the memory circuit on said pixel board.

### Claim 3 (depends on 2)

LED device according to claim 2, wherein the stored LED calibration data comprises operational time in relation to the actual LED power level and wherein said color controller is adapted to control said LEDs based on said operational time in relation to the actual LED power level.

### Claim 4 (depends on 3)

LED device according to claim 3, wherein said operational time in relation to the actual LED power level are stored as a two-dimensional historic file.

### Claim 5 (depends on 1)

LED device according to claim 1, wherein at least one of said LEDs is formed at a chip, and wherein said chip contains said memory circuit for storing said calibration data.

### Claim 6

LED device comprising a number of LED groups, each LED group comprising a number of LEDs on a pixel board, said LEDs having different colors and being electrically connected to a color controller, wherein said color controller is connected to a power supply, and wherein said pixel board is separated from said color controller and comprises a memory circuit having LED calibration data related to said LEDs stored therein and wherein at least the power supply is located on a main circuit board, wherein the main circuit board is located inside a heat conductive tube, wherein the pixel board is located outside of the heat conductive tube in a longitudinal recess of the heat conductive tube, and wherein a connector electrically connects the pixel board to the main circuit board.