Synthesis method of N-color (7<=N<=9) full-spectrum white light by two-step method

Abstract

The invention discloses a synthesis method of N-color (7<=N<=9) full-spectrum white light by a two-step method. N primary color spectra is utilized to mix colors. According to the chromaticity coordinates of N primary color spectra, the chromaticity diagram is divided into three groups and corresponding graphs are drawn to form a blue-light group triangle, a yellow-green-light group triangle and ared-light group, and then each point in the three groups of graphs is taken to form an inner triangle. The synthesis method includes: firstly, calculating the luminous flux Ya, Yb, Yc of the three vertices of the inner triangle needed for synthesizing the color temperature according to the color coordinates of the target color temperature; secondly, calculating the luminous flux Y1, Y2, ...YN ofthe primary color spectrum corresponding to each vertex to obtain the synthesized spectrum of the inner triangle combination and calculating the corresponding chromaticity index; traversing all the inner triangle combinations, and obtaining the best ratio of N primary color spectra of the synthetic target color temperature. The ratio of the primary color spectrum from the target color temperatureis inversely estimated, which improves the screening accuracy, avoids blind calculation, reduces the calculation amount and shortens the screening time.

Description

technical field [0001] The invention relates to the field of lighting technology, in particular to a two-step method for synthesizing full-spectrum white light of N colors (7≤N≤9). Background technique [0002] The full spectrum refers to the white light spectrum whose spectral wavelength includes all visible light, continuous spectrum, peak and trough parts with no serious imbalance in the wavelength of each band in the spectral diagram, and a color rendering index close to 100. The spectrum of sunlight can be called the full spectrum, and its color temperature changes with the seasons and the time of day and night. Therefore, the spectrum of a full-spectrum lamp should also change its color temperature over time. At present, full-spectrum LEDs synthesize white light through blue light chips plus various phosphors or multi-chip combinations, but it is still impossible to achieve all special color rendering indexes above 95, and no full-spectrum solution with full color tem...

AI Technical Summary

Problems solved by technology

At present, full-spectrum LEDs synthesize white light by adding a variety of phosphors or multi-chip combinations with blue light chips, but it is still impossible to achieve all special color rendering indexes above 95, and no full-spectrum solution with a full color temperature range has been proposed.

[0003] At present, the mainstream white LEDs on the market use blue LED chips (peak wavelength 440-480nm, half-width 18-25nm) to excite yttrium aluminum garnet (YAG) phosphors. Both R9 and R12 are low

[0004] Patent CN20440405 proposes a RGB three-color color-mixing LED lamp, which can mix the three colors in a cross-color manner, and the color mixing is uniform, but the color gamut area surrounded by the color coordinate points of the three primary colors is small, and the reproduced color gamut range is narrow. , there is also a large gap with the target light color, and the full spectrum cannot be achieved

Patent CN202796949 proposes a color-mixing LED lamp bead with five-color packaging, which mixes five LED chips of red, green, blue, yellow, and white, which enriches the color gamut of the synthetic spectrum and improves the color-mixing effect, but the above-mentioned patent does not Mention the ratio of the five LED chips to be mixed. If the ratio is fixed, it will be difficult to control the color mixing of multi-channel spectrum at the technical level.

Patent EP1878318 proposes a method of mixing colors using N primary colors (N≥4) to obtain white light with different color temperatures. The N primary colors include one white light and multiple pure color lights. The white light is close to the black body line area, and the pure color light is located in the chromaticity diagram. Therefore, it is only necessary to adjust the white light color coordinates and the two pure color light color coordinates closest to the target light color to mix colors to produce the target light color. However, this method does not consider that when N is large, it must contain multiple pure color lights. When the distance between the two pure color lights is relatively close, how to choose and distribute when combining the target light color, and the primary color of white light used for color mixing will cause color drift to a large extent, resulting in the result of color mixing not reaching the expected effect

[0005] Since the existing LED color mixing technology is difficult to meet people's demand for high-quality lighting, it is necessary to study a more accurate, easier to control, and more perfect color mixing method

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