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A variety of colors of red, orange, yellow, green, blue, purple, LED spotlight. Press the brightness of the sub-Pu Liang, highlighting, super bright, the same kind of chip in different package, it is not the same brightness. Human vision can be divided into visible and invisible light. Luminescent colors can be divided into color, color, colorful, and other various types. The purity of the color is different, prices vary greatly, especially your current pure-white LED price. Luminous perspective, the luminous efficiency is also different, and pay particular attention to use.
LED forward voltage. The different colors of solar street light forward current conditions, each have different forward voltage drop value, red, yellow: 1.8V to 2.5V, green and blue: 2.7V to 4.0V between. With the colors of the LED forward voltage drop and light intensity is not exactly the same.
LED rated operating current. The rated current of the LED, the common LED current is 20 mA, high-power LED current is generally ranging from 40mA or 350mA. Specific according to package plant to provide the current parameter value selection. General LED under the conditions of reverse voltage VR = 5V reverse current IR = 10A.
LED display has a very wide range of applications in all walks of life, the primary color wavelength of the LED bulbs in different application spaces have different requirements, some of the choice of the LED primary color wavelength in order to achieve good visual effects, and some are designed to meet the people habits, and some industry standards, national standards or international standards requirements. For example, the primary color wavelength of the green tube full color LED display options; the early days it was generally selected wavelength is 570nm high power LED downlight, although the costs are lower, but display a smaller color gamut, color reproduction is poor and low brightness. Nearly doubled in the choice of a wavelength of 525nm pure green display color gamut to expand the color reproduction of a substantial increase, which greatly improve the display of visual effects. For example, stock quotes display, people are usually accustomed to the red rose, fell with green, yellow flat. In the transport sector by the national standards are strict requirements of blue-green band, said passage of the red band of the forbidden line. Thus, the choice of primary color wavelength is an important part of the LED display.
Color uniformity of LED display has been a major problem plaguing the industry is generally believed that the uneven brightness of the car LED light be a single point of correction, to improve the brightness uniformity. Uneven chroma can not be corrected, only to improve the segmentation and filtering by the LED color coordinates.
The birth of pure blue, pure green LED full color LED display its wide color gamut, high brightness, sought after by industry. However, due to the chromaticity coordinates of red, green and blue LED with the PAL TV RGB color coordinate a large deviation (Table 1), Full Color LED Display color reduction degree of poor. Especially in the performance of people of color when visually more obvious deviation.