Weak current College】 【large-screen display screen brightness and description.

<br> Screen brightness <br> <br> Refers to the light-emitting surface luminous intensity of physical quantity known as the brightness (luminance), physics with l, candela per square meters or square candle cd/m2. Luminance is measured plasma .display luminous intensity of important indicators for plasma, high brightness also means that the plasma for its work environment better anti-interference ability. Plasma as luminescent cell structure is exactly the same, screen brightness very uniform - no light areas and dark areas. General plasma .brightness are above 500cd/m2 clear gorgeous display, some high-end plasma brightness can reach 1000cd/m2 or more. <br> <br> Light-emitting surface brightness is expressed by bright degree, refers to the light-emitting surface in the .specified direction of luminous intensity and direction of the vertical and the specified surface area ratio of the light, the unit is candela / m². For a diffuse scattering surface, although the direction of light intensity and luminous flux, but the brightness of each direction are .equal. The TV screen that is similar to that of diffuse scattering surface, so watch from all directions, have the same brightness. <br> <br> Different objects on light have different reflection coefficient <br> <br> Light intensity is available .on the plane of light measured in total, which is called the incident light (inci-dentlight) or illumination (illuminance). If the use of reflection from the plane to the amount of light in the eye to measure the intensity of light, this .kind of light as reflected light (reflectionlight) or luminance (brightness). for example, the General white about the amount of incident light absorption by 20%, the amount of light reflected is 80%; black paper only reflect the incident light amount of .3% so that the white and black paper in brightness varies greatly. <br> <br> The relationship between brightness and illumination <br> <br> Brightness and illumination of relations as in Figure 6-2 (a), the most common .illumination units is lumens (footcandle) .1 rooms is at a distance of standard candles a feet of a square foot flat on the luminous flux. If the metric units, then the m as standard, range of illumination with m candlelight (metrecandle) to .indicate that the 1 m standard Candles candle is the distance am far from the square area of illuminance equal to 1 m candle candlelight 0.0929 ft. 6-2 from the figure, we can easily understand the luminance and illuminance relationships, their relationship to: L .= R × E [formula 6-1]-L for brightness, R is the reflection coefficient, E for illuminance. Thus, when we know an object's surface reflectance and surface of illumination, you can calculate its brightness. <br> <br .> Brightness also has several units of measurement <br> <br> Brightness also has several measurements of the brightness of the units is-with an idealized standard defined by the State (as in Figure 6-2b) to a standard candles as photosource, .placed in a radius of 1 meter from the Centre of a sphere. Suppose that this candle will be evenly spread it all of the light, the surface of the ball in one square meter surface area on the amount of light as 1 lumens (lumen) .. the practical application, brightness units with lumens is too small, so they usually take it ten times more units - Lambert (millilambert) to represent the. Lambert than dollar slightly larger units is foot Lambert (footlambert), 1-Lambert equal to .0.929 ft lambertian. United Kingdom-standard foot Lambert is the number of candle light source, from the light source to the number of feet of surface area and surface reflectivity to regulations in some countries, the widespread use of metric units, is to-Lambert .-based [1-Lambert (mL) = 0.929 ft Lambert (ftL) = 3.183 candlelight/m2 (c/m2) = 10 APU, reference (apostilbs)]. the brightness of the flats have: candela / m² (ie nits, .Nit = 1cd/m2), etc. <br> <br> <br> <br>.