rgb led introduction
Both RGB LEDs and white LEDs are actually intended to achieve the effect of white light, but one is directly represented by white light (phosphor), and the other is a mixture of red, green and blue colors.
RGB light imaging principle: RGB light is based on the three primary colors together. In addition, there are also blue LEDs with yellow phosphors, and ultraviolet LEDs with RGB phosphors. In general, these two have their imaging principles, but the attenuation problem and The impact of ultraviolet light on the human body is a relatively difficult problem to solve in the short term. Although they can meet the demand for white light, they have different results.
In terms of application, RGB is obviously more diverse than white LEDs. For example, when car lights, traffic signs, shop windows, etc. are used in a certain band of light, the color mixing of RGB can be freely compared. In contrast, white LEDs It is more disadvantageous, so of course it is more effective. On the other hand, if it is used for lighting, RGB LED lights will be more disadvantageous, because it is mainly used to see the white light luminous flux, life and pure colors. Currently, RGB LED lights are mainly used for decorative lights aspect.
Seeing that the white LEDs using phosphors have no bright future, Lin Zhuxuan, general manager of Meiguang, who has abandoned this production line, has specifically stated that it is not just a problem of light attenuation, other problems are also a major cause. He made it clear that white LEDs were significantly inferior to RGB in terms of sharpness and color purity. He also stated that the overall brightness and sharpness of RGB in the proper overlapping state was five times that of phosphor white LEDs. In addition, the problem of light attenuation and the high cost of wafers are also a major reason why he is optimistic about RGB lights.
Those who like high-quality images should not have difficulty finding out that some LED backlights appear particularly clear and vivid, even to the extent of high-quality televisions. This situation is exactly the characteristics of RGB. Red is red and green. It is the characteristics of green, blue and blue. In the mixing of light, it has more characteristics. Like the painter's palette, it can freely present the most realistic color world and make up beautiful life.
The control problems of RGB lights still need to be strengthened. For example, if one of the lights is broken, it will be quite obvious on the entire screen. On the contrary, white LED lights can complement each other because it is a side-fire relationship, so it can make up A broken LED and the uniformity make up, so that the overall condition does not look too bad.
RGB LED light color changing principle explained
When three LEDs are used to light two LEDs, it can emit yellow, purple, and cyan (such as purple when red and blue LEDs are lit); if three red, green, and blue LEDs are lit simultaneously , It will produce white light. If there is a circuit that can make the red, green, and blue LEDs light up in pairs, individually, and three primary color LEDs at the same time, he can emit seven different colors of light, so this colorful LED light appears. Kind of phenomenon.
The color-changing light is composed of three primary color LEDs: red (R), green (G), and blue (B). Two-color LEDs are very familiar to us. It is generally composed of red LED and green LED. It can emit red or green light alone. If the red and green lights are bright at the same time, the red and green lights are mixed into orange and yellow.
Color is a property of light. Without light there is no color. Under the illumination of light, people can feel the colors of various objects through the eyes. These colors are the comprehensive effect of the characteristics of the human eye and the objective characteristics of the object. Color television technology transmits and receives color images based on the visual characteristics of the human eye. Under the sun's rays, people can see colorful natural scenery. According to the optical theory of physics, light is a substance that exists in the form of an electromagnetic wave. Any electromagnetic wave that can cause the visual response of the human eye is called visible light, and it is an electromagnetic wave with a wavelength between 380 ~ 780nm.
The human eye can distinguish not only the brightness of the color light, but also the color of the light when the color light intensity is sufficient. For colored light, three physical quantities can be described: brightness, hue, and color saturation. In color television, the so-called transmission color image is essentially the brightness and chrominance of the transmission image. Monochromatic light with different wavelengths will cause different color perception, but the same color perception can be derived from the combination of different spectral components. When people carried out color mixing experiments, they found that almost all kinds of colors appearing in nature can be obtained by mixing three kinds of monochromatic light in different proportions. Three monochromatic lights with this characteristic are called primary colors, and these three colors are called three primary colors.
The three primary colors used in color televisions are red, green, and blue. The main reason is that the human eye is most sensitive to the light of these three colors, and more colors can be matched by adding and mixing red, green, and blue colors. The principle of three primary colors is an important principle for color decomposition and mixing. This principle lays the foundation for color TV technology and greatly simplifies the technical problem of transmitting color using electrical signals.
According to the principle of three primary colors, we only need to decompose the various colors to be transmitted into three primary colors of red, green, and blue, and then convert them into three electrical signals for transmission. At the receiving end, the original color image can be reproduced by using the three color picture tubes that can emit red, green, and blue light. The color TV we are using now, when you look closer at the screen, you will find that the color image is composed of many red, green, and blue points. This is the use of the poor resolution of the human eye's spatial details to project the three primary colors of light onto the same surface On the three red, green, and blue phosphors, the human eye will produce a color feeling after mixing the three primary colors due to the small pitch. This is the spatial additive color mixing method.
After passing through a prism, white light is decomposed into a color spectrum with gradually transitioning colors. The colors are red, orange, yellow, green, cyan, blue, and purple in this order. This is the visible spectrum. Among them, human eyes are most sensitive to red, green, and blue. Human eyes are like a three-color receiver system. Most colors can be synthesized by three colors of red, green, and blue according to different proportions. Similarly, most monochromatic light can be decomposed into three colors of red, green and blue. This is the most basic principle of colorimetry, namely the principle of three primary colors. The three primary colors are independent of each other, and no one of the two primary colors can be combined. Red, green and blue are the three primary colors. These three colors have the widest range of colors. The red, green and blue three primary colors are added in different proportions to form a mixed color called additive color mixing.
RGB tri-color LED color changing program
This program is used to control the RGB three primary color LEDs to make them fade in order of red, green, blue, purple, yellow, cyan and white.
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