* Traffic lights, video screens
2. Common LED lights:
LED lights have a common market: LED lights and buried, LED underwater lights, LED lawn lamp, LED lights outline,
120V LED Rope Light, LED lights Cup, LED flood light, LED spotlights, LED brick lights, LED wall lights , LED bulb.
With LED light efficiency improvements, continuous improvement and optimization of key technologies, there are a number of companies introduced a combination of solar and solar-power LED semiconductor lights.
3.LED emission color
The current mainstream red R, blue B, green G, which is usually to talk about RGB, the three basic colors can be combined into ever-changing colors.
Let us focus on white, white There are two ways, one is the RGB combination, one is coated with phosphor blue light package when implemented in this way are the mainstream, according to the ratio of different phosphors, there can be a lot of colors mainly from warm white to cool white changes. Of course, in the case of some special purpose, as well as infrared and ultraviolet emission LED.
To sum up: LED basic colors are red R, blue B, green G, IR, UV, RGB plus various combinations of colors, namely a variety of white LED phosphors
Role 4.LED power
The basic role of the power supply is a constant current to the LED. Since led lamp beads rated voltage and current is low voltage DC (between 1.8-4V, 20 mA 至 700 mA range), and we except certain lamps, others are direct AC mains input to light lamps, it must have a power supply to the high voltage AC input current is converted to low-voltage direct current led applicable. Even 12V or 24V DC battery input directly, there is full battery voltage is high and the forthcoming state discharged state the problem of low voltage, that is, in other words there will be fluctuations in voltage, voltage fluctuations will affect the life led lamp beads, it must be To apply power. In the selection of the power supply it is important to consider the acceptable power loss.
Keywords: LED RGB color theory is to define what the principle of three-color LED RGB
Color is a property of light, no light there is no color. Under the irradiation of light, people feel the color through the eyes of various objects, color is the combined effect of these characteristics of the human eye and the object objective characteristics. Color television technology is based on visual characteristics of the human eye to transmit and receive color images. Under the irradiation of sunlight, one can see the colorful nature scene. Optical theoretical physics shows that light is an electromagnetic wave in the form of a substance. All can cause human visual reaction called visible light waves, it is the electromagnetic wavelength between 380 ~ 780nm. Not only the human eye can distinguish color brightness size, but also in the color of light intensity is sufficient light can distinguish between colors. Colored light can be used for brightness, hue and color saturation to describe three physical quantities. In the color television, the so-called transfer a color image, the image is essentially a transmission luminance and chrominance. Monochromatic light of different wavelengths can cause a different color feeling, but the feeling is the same color can be derived from a combination of different spectral components. It was found that during mixing: the emergence of a variety of color in nature, almost all can use a three monochromatic light obtained by mixing in different proportions. Three monochromatic light having such characteristics is called the base shade, these three colors called tricolor. Colour is used in the three primary colors red, green and blue. The main reason is the human eye these three colors of light the most sensitive, and the red, green, and blue color mixing can be worthy of adding more color. Trichromatic principle is the decomposition of color, mixing an important principle. This principle is the basis of color television technology, which greatly simplifies the electrical signal to transmit the color of technical problems. According to the principles of the three primary colors, a variety of color we only need to be transferred into red, green, and blue color, and then they become three electrical signals for transmission. At the receiving end, with these three signals can be respectively red, green, and blue light of a color picture tube, you can reproduce the original color image. We now TV, approached look at the screen, you'll find a color image is constituted by a number of red, green and blue three, which is the use of poor resolution of the human eye spatial detail the characteristics of the three basic shade were projected on the same surface red, green and blue phosphors on, because dot pitch is small, the human eye will feel the three primary colors to produce color after mixing. This is the space adding color mixing.
Trichromatic principle
In high school physics class, we might have done the test prism, white light through the prism after being broken down into a variety of colors gradual transition of chromatography, followed by the color red, orange, yellow, green, cyan, blue, purple, and this is the visible spectrum . In which the human eye to red, green and blue is most sensitive to the human eye as the receiver of a three-color system, most of the color can be red, green and blue tricolor synthetically produced in accordance with different proportions. Also the vast majority of monochromatic light can be broken down into red, green and blue shade. This is the most basic principles of colorimetry, ie trichromatic principle. Three primary colors are independent, any kind of color can not have the other two color synthesis. Red, green and blue are the three primary colors, three colors synthesis of the most extensive range of colors. Red, green and blue color added and synthesized according to the different blending ratio called additive mixture.
Red + green = **
Green + Blue = Cyan
Red + blue = magenta
Red + green + blue = white
**, Cyan, magenta, and hue are a mixture of the two together, so they are also known as adding a secondary color. In addition:
Red + blue = white
Green + magenta = white
** = Blue + white
So cyan, **, magenta and red, blue, green complementary color, respectively. Because everyone's eyes for the same monochromatic feel different, so if we mix the three primary colors with the same intensity when, assuming white light intensity of 100%, and this time the subjective feeling is that the brightest green, followed by red, blue weakest.
In addition to adding color mixing addition there subtraction color mixing method. Under white light, cyan pigments absorb red and blue reflection, and reflection ** ** pigment absorbs blue, magenta pigments absorb green and magenta reflection. That is:
White - red = cyan
White - Green = Magenta
White - blue = **
In addition, if the cyan and ** two pigments are mixed under white light illumination, since the pigment absorbs red and blue, while reflecting the green, for mixing paint us as follows:
Pigment (** + cyan) = White - Red - Blue = Green
Pigment (magenta + cyan) = White - Red - Green = Blue
Pigment (** + magenta) = white - green - blue = red
Are subtracted from the above mixing, blending is subtracted to absorb different proportions of three primary colors to form a different color. So there are the cyan, magenta, ** as pigments tricolor. Mixing the three primary colors of pigment widely used in paint, printing. The three primary colors in paint, red, green and blue are called secondary colors or subtract a secondary color pigments. In a secondary color subtraction are:
(Cyan, magenta + ** +) = White - Red - Blue - Green = Black
Color mode with more than the sum represented by mixing three primary colors called RGB mode, and color mode with the subtraction color mixing principle expressed by the three primary colors is called CMYK mode, they are widely used in painting and printing fields.
RGB mode is the most commonly used graphics software color mode, in this mode, image processing more convenient, but, RGB images than CMYK images stored in smaller, you can save memory and space.
CMYK mode is a paint mode, so it belongs to the printing mode, but essentially no difference between the RGB mode, but produce a different color ways. RGB color mixing an additive model, CMYK is subtractive primary color mode. For example, the display uses RGB mode, because the display is a fluorescent material of the electron beam bombardment on the phosphor screen emit light to produce color. When there is no light when black is white when the light is applied to the maximum. The printer does not emit light of its own ink. Thus only use a specific light absorption and reflection of other light colors, so you need to use the subtractive method to resolve.
HLS (hue, lightness, saturation) principle, similar to:
RGB LED Rope Light
HLS is Hue (Hue), Luminance (brightness), Saturation (saturation). Hue is an attribute of color, which essentially is the color of the basic colors, that is, we often talk about red, orange, yellow, green, cyan, blue, purple seven, each of which represents a hue. Adjust the hue is changing its color.
Brightness is the graph of various colors primary colors (RGB image of primary colors such as R, G, B or three from the various hues) of brightness, brightness adjustment is to adjust the brightness. Luminance range from 0 to 255, divided into 256 levels. And we usually talk about grayscale image, that is, between pure white and pure black divided the 256 levels of brightness, that is, from white to gray, sub-black. Similarly, in RGB mode represents a primary color shades, namely red, green and blue shading from light to dark.
Saturation refers to the image color saturation. For standard colors each color has an artificial prescribed saturation is described by a similar degree of color between the physical and the standard color. Saturation adjustment is to adjust the image saturation. When an image saturation strip zero, the image becomes a grayscale image, you can try one on a TV-style buttons to adjust saturation.
There is also a concept that contrast. Contrast is the difference between the different colors. The greater the contrast, the greater the difference between the two colors, on the contrary, the closer. For example, a gray-scale image to increase its contrast will be more black and white, the limit tuned into black and white images, on the contrary, we can get a gray canvas. We understand the principle of color, we would not at a loss in image processing, and for the adjustment of color can also faster and more accurate.
Red, yellow, blue
A: primary color theory
The three primary colors, the so-called primary colors, refers to any of these three colors are not the same color mixing produced by the other two primary colors, while other colors can be mixed out of three colors in accordance with a certain proportion, color science, said these three separate color for the three primary colors.
B: blending theory
Mixed colors mixed into addition and subtraction mixed color also can only take place after mixing into the vision, called the neutral mix.
(A) addition mixed
Addition shade mixing means mixing two or more light mixed together, will increase the brightness, the overall brightness of the mixed color of light is equal to the sum of mixed colored brightness. Shade mixing, the three primary colors are red, green, violet. This three-color light is generated can not be confused with other shade of another. and:
Zhu Hongguang light + green light = **
Green light + light = blue-violet light
Zhu Hongguang = purple violet light + light
** Light, blue light, violet light is between shade.
If only by mixing two shade can produce white light, then the light is two mutually complementary color. For example: red and blue light shade; shade of green and purple light; light violet light with **.
(B) the subtraction mix
Subtraction mixed mainly refers to mixing the pigment.
After the white light through colored filters, part of the light is reflected and absorbed by the rest of the light, reducing the portion of the radiation power is off, but it finally through the dimming light twice, so called subtraction color mixing mixing. In general, transparent and strong dye, mixed with obvious dimming effect.
The three primary colors are mixed subtraction addition complementary color mixing three primary colors, namely: green complementary color red (magenta), blue-violet complementary color yellow (yellow), red complementary color blue (sky blue). In two colors mixed color produce inter-color:
Red + blue = purple
** + Red = Orange
** + Blue = Green
If the two colors can produce gray or black, the two colors is the complementary color. A certain percentage of the three primary colors mixed, the resulting color can be black or dark gray. In subtraction mixing, mixing color, the more low lightness, purity will decline.
(Iii) a neutral mix
Visual color mixing neutral mix is based on the physiological characteristics of the human visual generated, but not change the shade or light emitting material itself, the luminance blending effect neither increase nor reduce, so called neutral mix.
There are two ways visual mix:
A: Color rotary mixing: put two or more colors and placed on a disc, the power to make it through rapid rotation, and see the new color. Color rotary mixing effect in terms of similar hue mixed with the addition of the law, but the brightness is mixed colors mean.
B: Space mix: the juxtaposition of different colors, when they are projected on the retina small to a certain extent, these different colors will be simultaneously stimulating effect on the retina very near the site of the photoreceptor cells, so that the eyes are they are difficult to distinguish them individually, blended colors will produce in vision, this hybrid called space Mixed
