What is a color filter
lens is an optical element made of transparent materials (such as glass, crystal, etc.). The lens is a refracting lens, and its refractive surface is a transparent body with two spherical surfaces (part of the spherical surface), or one spherical surface (part of the spherical surface) and one plane. The images it forms have real and virtual images. Lenses can generally be divided into two categories: convex lenses and concave lenses. The center part is thicker than the edge part is called convex lens, there are three kinds of double convex, plano-convex, and concave convex; the center part is thinner than the edge part is called concave lens, there are three kinds of double-concave, plano-concave and convex-concave.
Lens classification. Convex lens has the function of condensing light, so it is also called 'converging lens' and 'positive lens' (which can be used for hyperopia and reading glasses). The lens design of this type of lens can be divided into:
a. Double-concave lens-a lens with two sides; b. Plano-concave lens-a lens with a concave side and a flat side; c . Convex-concave lens-a lens with one convex side and one concave side. Thin lens-a lens whose central part has a large thickness compared to the radius of curvature of its two sides. In the early days, the camera was only equipped with a convex lens, so it was called a 'single lens.'
With the increasing development of science and technology, modern lenses have a number of different forms and functions of convex and concave lenses to form a convergent lens, called a 'compound lens.' The concave lens in the compound lens functions to correct various aberrations.
Optical glass has high transparency, purity, colorlessness, uniform texture, and good refractive power, so it is the main raw material for the laser lens produced by the lens. Due to the difference in chemical composition and refractive index, optical glass has:
1. Flint glass--Pb oxide is added to the glass composition to increase the refractive index (1.8804);
2. Crown glass--made by adding sodium oxide and calcium oxide to the glass composition to reduce its refractive index (the refractive index of barium crown glass is 1.7055);
3. Lanthanum crown glass-a variety discovered in recent years, it has the excellent characteristics of high refractive index and low dispersion rate, which provides conditions for the creation of large-aperture advanced lenses.
The basic structure of color filter is composed of glass substrate, black matrix (BlackMatrix), color layer, protective layer, and ITO conductive film. The general transmissive TF high-power laser mirror group T uses a color light sheet structure. In layman's terms, the pigment photoresist is coated on the glass substrate.
The color filter accounts for about 18% of LCD-TV, and has little to do with the size of LCD-TV. The color filter is a decisive component that determines the color performance of the LCD display, and also affects the contrast, brightness, and viewing angle of the display.
Colorfilter is the key component of the colorization of Liquid Crystal Display. The LCD flat panel display is a non-active light-emitting component, and its color display must be provided by the internal backlight module (transmissive LCD) or the incident light from the external environment (reflective or semi-transmissive LC mirror D), and then With the drive IC (DriveIC) and liquid crystal control to form a grayscale display, and then through the R, G, B color layer of the color filter to provide chromacity (Chromacity), forming a color display screen.
Solving the recontamination of optical lenses
In the laser with general power output, all lenses are mostly due to manufacturing Process reasons or external pollution and other factors cause the lens to absorb a specific laser wavelength, which will shorten the life of the lens over time. It is an optical film that uses the principle of interference to only pass light in a specific spectral range. Usually composed of multilayer films. There are many types of interference filters with different uses. Common interference filters are divided into cut-off filters and band-pass filters.
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