RGB LED color adjustment

RGB is a kind of feeling when LEDs are lit by three primary color LEDs, it can emit yellow, purple, and cyan (such as red and blue LEDs emit purple light when they are lit); if the red, green, and blue LEDs are lit at the same time When, it will produce white light. If there is a circuit that can make the red, green, and blue LEDs light up two by two, individually light up, and light up the three primary color LEDs at the same time, it can emit seven different colors of light, so the colorful LED lights appear.

The color changing lamp is composed of three primary colors of red (R), green (G), and blue (B). Bi-color LED is 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 light and the green light are bright at the same time, the red and green lights are mixed into orange-yellow.

Color is an attribute of light. Without light, there is no color. Under the irradiation of light, people perceive the colors of various objects through their 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 sunlight, people can see colorful natural scenery. According to the optical theory of physics, light is a substance in the form of electromagnetic waves. Any electromagnetic wave that can cause a visual response of the human eye is called visible light, which is an electromagnetic wave with a wavelength between 380 nm and 780 nm.

The human eye can not only distinguish the size of the color brightness, but also distinguish the color of the light when the color light intensity is sufficient. Color light can be described by three physical quantities: brightness, hue and color saturation. In a color TV, the so-called transmission of color images is essentially the transmission of brightness and chromaticity of the image. Monochromatic light of different wavelengths can cause different color perceptions, but the same color perception can be derived from different combinations of spectral components. When people conduct color mixing experiments, they found that almost all colors appearing in nature can be obtained by mixing three kinds of monochromatic lights in different proportions. The 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 the three colors of red, green and blue can be mixed and added to match more colors. The principle of three primary colors is an important principle for decomposing and mixing colors. This principle lays the foundation for color television technology and greatly simplifies the technical problem of using electrical signals to transmit color.

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 a color picture tube that can emit red, green, and blue light with these three electrical signals. With the color TV we are using now, look closer and look at the screen, and you will find that the color image is composed of many red, green and blue points. This uses the characteristics of poor spatial detail resolution of the human eye to project the three primary colors on the same surface. On the three phosphors of red, green and blue, because the dot pitch is very small, the human eye will produce the color sensation after the three primary colors are mixed. This is the space additive color mixing method.

In the middle school physics class, we may have done a prism experiment. After passing through the prism, white light is decomposed into a gradual transitional color spectrum. The colors are red, orange, yellow, green, blue, blue, and purple. This is the visible spectrum. . Among them, the human eye is most sensitive to red, green, and blue. The human eye is like a three-color receiver system. Most colors can be produced by combining the three colors of red, green and blue in different proportions. Similarly, most monochromatic light can be divided into three colors of red, green and blue. This is the most basic principle of colorimetry, the principle of three primary colors. The three primary colors are independent of each other, and no one primary color can be combined with the other two colors. Red, green and blue are the three primary colors, and these three colors have the most extensive color range. The three primary colors of red, green and blue are added in different proportions to form a mixed color called additive color mixing.