Methods and apparatus for estimating the intensity of one spectrum of light in a mixed light

A device and intensity technology, applied in the field of estimating the intensity and equipment of a spectrum in mixed light, can solve the problems of intensity and color drift, manufacturing deviation, etc.

Inactive Publication Date: 2008-07-30
INTELLECTUAL DISCOVERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] System manufacturing variations, operating conditions, LED aging, and other factors can cause individual LEDs in a lighting system to drift in intensity and color

Method used

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  • Methods and apparatus for estimating the intensity of one spectrum of light in a mixed light
  • Methods and apparatus for estimating the intensity of one spectrum of light in a mixed light
  • Methods and apparatus for estimating the intensity of one spectrum of light in a mixed light

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Embodiment Construction

[0017] As noted previously, lighting systems such as LCD backlights sometimes include RGB LEDs. RGB LEDs can be used together to generate mixed light (eg, white light in the case of an LCD backlight).

[0018] System manufacturing variations, operating conditions, LED aging, and other factors can cause the intensity and color of individual ones of the LEDs in the lighting system to drift. Therefore, optical feedback systems employing one or more photosensors are often used to measure the intensity and / or color point of the mixed light produced by the LED lighting system. The output of the feedback system is then used to adjust the drive signal and thus the intensity of individual LEDs or groups of LEDs of the lighting system.

[0019] The problem with traditional optical feedback systems is that they are poor at measuring the intensity of the "visible red" wavelengths in the mix. This is because the pigments used to filter the red wavelengths of the mixed light cannot filter...

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PUM

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Abstract

The present invention discloses an apparatus and method for estimating the intensity of one spectrum of mixed light in response to a sensed intensity of one or more other spectrums of mixed light. In one embodiment, light having a first spectrum is filtered from the mixed light. Light having a second spectrum that is different from the first spectrum is also filtered from the mixed light. The intensity of light having the first spectrum and the intensity of light having the second spectrum are then sensed. The intensity of the light with the third spectrum is estimated from the sensed intensities of the light with the first spectrum and the light with the second spectrum.

Description

technical field [0001] The present invention relates to methods and apparatus for estimating the intensity of one spectrum of mixed light in response to sensed intensities of one or more other spectrums of mixed light. Background technique [0002] Illumination systems such as liquid crystal display (LCD) backlights sometimes include red, green, and blue (RGB) light emitting diodes (LEDs). RGB LEDs can be used together to generate mixed light (eg, white light in the case of an LCD backlight). [0003] System manufacturing variations, operating conditions, LED aging, and other factors can cause the intensity and color of individual ones of the LEDs in the lighting system to drift. Therefore, optical feedback systems employing one or more photosensors are often used to measure the intensity and / or color point of the mixed light produced by the LED lighting system. The output of the feedback system is then used to adjust the drive signal and thus the intensity of individual L...

Claims

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Application Information

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IPC IPC(8): G01J3/46G01J3/28G01J1/10
CPCG01J1/0488G01J1/32G01J3/506G01J3/51G01J3/513G01N21/27
Inventor 莱恩-李凯文·利姆西村健
Owner INTELLECTUAL DISCOVERY CO LTD
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