LED control apparatus

A technology of light-emitting diodes and photosensitive diodes, applied in the field of RGB-based LED illuminants, can solve the problems of complex implementation and insufficient utilization
CN1575623AInactive Publication Date: 2005-02-02SIGNIFY HLDG BV
0 Cites 19 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SIGNIFY HLDG BV
Publication Date
2005-02-02
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

Method and apparatus for controlling an RBG based LED luminary which measures the output signals of filtered photodiodes and unfiltered photodiodes and correlates these values to chromaticity coordinates for each of the red, green and blue LEDs of the luminary. Forward currents driving the LED luminary are adjusted in accordance with differences between the chromaticity coordinates of each of the red, green and blue LEDs and chromaticity coordinates of a desired mixed color light.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The present invention relates to RGB-based LED illuminants, and more particularly, the present invention relates to apparatus for controlling RGB-based LED illuminants in which the The wavelength difference between the desired wavelengths is adjusted so that the LED light emitter produces the desired color and illuminance. Background technique

[0002] As is well known in the art, light emitters based on red, green and blue (RGB) light emitting diodes (LEDs) produce light of different colors which, when properly mixed, produce white light. RGB LED-based illuminants are widely used in applications such as LCD backlighting, residential freezer lighting, and white lighting. Lighting with LED-based illuminants presents some difficulties because the optical properties of individual RGB LEDs vary with temperature, forward current, and aging. In addition, the characteristics of each batch of LEDs produced by the same LED production process are obviously dif...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More