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Thermoplastic panel to shift perception of color temperature of light emitting diodes

A technology of light-emitting diodes, thermoplastic resins, applied in optical components for changing the spectral characteristics of emitted light, electroluminescence light sources, optics, etc.

Inactive Publication Date: 2017-08-29
POLYONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to be able to adjust or tune from the color temperature of the light emitted by the LED to the color temperature of the light being seen, these methods all rely on expensive electrochromic layers or other components in the assembly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0039] The preparation of the compounds according to the invention is uncomplicated. The compounds of the present invention can be produced in batch or continuous operation.

[0040] Compounding in a continuous process is usually carried out in an extruder whose temperature is raised sufficiently to melt the polymer matrix and solid ingredient additives can be added at the extruder head or downstream in the extruder. Extruder speeds can range from about 50 to about 500 revolutions per minute (rpm), and preferably from about 100 to about 300 rpm. Typically, the output of the extruder is pelletized for subsequent extrusion or molding into polymeric articles.

[0041] Mixing in a batch process is usually carried out in a Banbury mixer whose temperature is also raised sufficiently to melt the polymer matrix for the addition of solid ingredient additives. The mixing speed is 60-1000 rpm and the mixing temperature may be ambient temperature. Likewise, the output of the mixer is s...

Embodiment

[0056] Geon TM The M7500 polyvinyl chloride compound was melt blended with 0.0004 phr of Solvent Violet 13 anthraquinone dye from Lanxess, Leverkusen, Germany, and extruded to a thickness of 0.254 cm (0.1 inches) by 7.62 cm (3 inches) wide by 15.24 cm (6 feet) long to prepare test panels. The panel is placed between the LEDs and the viewer on the side of the panel surface opposite the LEDs. The panel has a light transmittance of 37% as measured according to ASTM D1003. The LED had a color temperature of 3320K measured using a Gigahertz-Optik HCT-99D Luminous Color Meter. Using the same Gigahertz-Optik HCT-99D handheld light colorimeter, the measured perceived color temperature was 2867K, with a 453K offset.

[0057] The above experiments were repeated under the conditions of 0.00020, 0.00025, 0.00030, and 0.00035, and the perceived color temperature shifts were 420K, 324K, 355K, and 413K, respectively. From this information, one skilled in the art can design the amount of...

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Abstract

Color temperature actually emitted by a light emitting diode (LED) is perceived by a viewer of that LED to be altered because of the placement of a passive color temperature-shifting panel between the viewer and the LED. The panel is colored in a manner to cause a perception of a shift from one color temperature of the light emitting diode to another color temperature of the light emitting diode in the absence of any electrochromic, photochromic, or thermochromic material in the panel.

Description

[0001] priority claim [0002] This application claims priority to US Provisional Patent Application Serial No. 62 / 061,879 (Attorney Docket No. 12014016), filed October 9, 2014, which is incorporated herein by reference. field of invention [0003] The invention relates to a method of adjusting the perception of the color temperature of a light-emitting diode by using a thermoplastic panel between the light-emitting diode and the observer of the light of the light-emitting diode. Background of the invention [0004] LEDs are rapidly gaining popularity for indoor and outdoor lighting due to their lower power consumption compared to incandescent bulbs. [0005] LEDs are produced on a commercial scale in various color temperatures. The conventional display of LEDs sold in commercial retail stores includes "soft white" (2700K); "warm white" (3000K); "bright white" (3500K); temperature measurement. [0006] Due to the difference in color temperature to be obtained, the manufac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21S10/02F21V9/10G02B5/02G02B5/22G02B1/04H05B33/20F21V9/40
CPCF21S10/02G02B1/04G02B5/0236G02B5/0278G02B5/0294G02B5/223H05B33/20C08L2666/70F21V9/08
Inventor D·佩尔辛D·埃特勒S·沙柯J·斯蒂芬森
Owner POLYONE CORP