What are the parameters of led display

The reason why LED has been widely emphasized and rapid development, is inseparable from its own advantages. These advantages are summarized as: high brightness, low operating voltage, low power consumption, large-scale, long life, impact resistance and stable performance.LED's development prospects are extremely broad, is moving towards higher brightness, higher weather resistance, higher luminous density, higher luminous uniformity, reliability, the direction of the development of panchromatic.LED displays are widely used in sports stadiums, commercial applications, banks, securities, postal services, wharf LED display screen is widely used in sports venues, commercial applications, banks, securities, postal services, docks, shopping malls, stations, postal services, telecommunications, institutions, monitoring, schools, restaurants, hotels, entertainment, and other different outdoor venues for advertising and publicity, the 2013 Universiade in Russia UNILUMIN Umesh25 building screen real-time broadcasting picture smooth and delicate. Static scanning technology adopts static latch scanning mode, high power drive, fully ensure the luminous brightness. Automatic brightness adjustment with automatic brightness adjustment function, can be in different brightness environment to get a very good playback results. LED display in retaining the brightness at the same time, there are drawbacks, that is, in the rainy days, LED display after rain wet, human eyes for a long time close to the display will be very easy to induce eye disease, the case of tears, this light pollution, LED display as an environmentally friendly technology should be the need to take into account the impact of light on the human spirit, do not over-pursuit of brightness. Comprehensive use of imported large-scale integrated circuits, reliability greatly improved, easy to debug and maintain. LED display performance: 1) strong luminous brightness, in the visible distance when the sunlight directly on the surface of the screen, the content of the display is clearly visible. Super grayscale control with 1024-4096 levels of grayscale control, display color 16.7M or more, clear and realistic colors, three-dimensional sense of strong. 2) static scanning technology, using static lock scanning mode, high-power drive, fully ensure the luminous brightness. 3) automatic brightness adjustment with automatic brightness adjustment function, can be in different brightness environment to get a very good playback results. 4) the full range of imported large-scale integrated circuits, reliability has greatly improved, easy to debug and maintain. 5) the LED display screen performance is superb: 1) strong luminous brightness, in the visible distance when the sunlight hits the screen surface, the display content is clearly visible. (4) the full use of imported large-scale integrated circuits, reliability greatly improved, easy to debug and maintain.5) advanced digital video processing, technology distributed scanning, BSV LCD splicing technology high-definition display, modular design/constant-current static drive, brightness automatically adjusted, ultra-high-bright solid-color pixels, the image picture is clear, no jitter and ghosting, to eliminate distortion. Video, animation, charts, text, pictures and other kinds of information display, networking display, remote control.LED color and process of manufacturing LED materials are different, can produce photons with different energies, through which you can control the wavelength of the light emitted by the LED, that is, the spectrum or color.1. History of the first LED used in the material is arsenic (As) gallium (Ga), its forward PN junction voltage drop (VF, can be understood as the light or working voltage) for 1.424V, the light emitted for the infrared spectrum. 2. Another commonly used LED materials for phosphorus (P) gallium (Ga), its forward PN junction voltage drop of 2.261V, the light emitted for the green light. 3. Based on the two materials, the early LED industry, the use of GaAs1-xPx material quenstrophy structure, theoretically, can produce any wavelengths from the infrared to the green range. 4. Has been to the green light range of any wavelength of the LED, the subscript X represents the percentage of phosphorus element to replace the arsenic element. Generally through the PN junction voltage drop can determine the wavelength color of the LED. Typical of which are GaAs0.6P0.4 red LED, GaAs0.35P0.65 orange LED, GaAs0.14P0.86 yellow LED and so on. Due to the manufacture of gallium, arsenic, phosphorus three elements, so commonly known as these LEDs for three-element light-emitting tube. GaN (gallium nitride) blue LED, GaP green LED and GaAs infrared LED, known as two-element light-emitting diode. The current very new process is a mixture of aluminum (Al), calcium (Ca), indium (In) and nitrogen (N) four elements of the four elements of AlGaInN four elements of the material manufactured four elements of the LED, can cover all the visible light and some of the spectral range of ultraviolet light. 4. Luminous intensity of the unit of measurement of illumination units (Lux), luminous flux units (lumen), luminescence unit (Candle power) (Candle power). 5. 1CD (Candle power) refers to the complete radiation of the object, in the platinum freezing point temperature, every sixtieth of a square centimeter area of luminous intensity. (Formerly referred to the diameter of 2.2 cm, the mass of 75.5 grams of whale oil candles, burning 7.78 grams per hour, the flame height of 4.5 cm, along the horizontal direction of luminous intensity). 6. 1Lm (lumens) refers to the 1 CD candles in the distance of 1 centimeter, an area of 1 square centimeters of the plane of the luminous flux. 7. 1Lux (Lux) refers to the luminous flux of 1L uniformly distributed in 1 square meter Area of illuminance. 8. General active luminous body using luminous intensity unit candela CD, such as incandescent lamps, LEDs, etc.; reflective or penetrating objects using luminous flux unit lumens L, such as LCD projectors, etc.; and illuminance unit lux Lux, generally used in the field of photography, etc.. The three units of measurement are numerically equivalent, but need to be understood from different perspectives. For example: if an LCD projector brightness (luminous flux) of 1600 lumens, its projection to the fully reflective screen size of 60 inches (1 square meter), then its illuminance is 1600 lux, assuming that the light outlet from the light source 1 cm, the light outlet area of 1 square centimeters, then the luminous intensity of the light outlet is 1600 CD. and the real LCD projector due to the loss of light propagation, reflective Or transmittance film loss and uneven distribution of light, brightness will be greatly reduced, generally 50% of the effectiveness of the very good. 9. In practice, the light intensity calculation is often easier to map the data units or variable use. For the LED display this active light-emitting body generally use CD / square meter as the luminous intensity unit, and with the observation angle as an auxiliary parameter, which is equivalent to the screen surface illuminance unit Lucks; will multiply this value with the effective display area of the screen to get the whole screen in a very good perspective on the luminous intensity, assuming that the luminous intensity of each pixel of the screen in the corresponding space is constant, then the value can be regarded as Is also the luminous flux of the whole screen. General outdoor LED display screen must reach 4000CD / square meter brightness can be more ideal in daylight display results. Ordinary indoor LED, great brightness in the 700 to 2000 CD / square meter or so.　 The luminous intensity of a single LED to CD as a unit, along with viewing angle parameters, luminous intensity and LED color has no relationship. The luminous intensity of a single tube from a few mCD to five thousand mCD varies. LED manufacturers give the luminous intensity refers to the LED in the 20mA current under the light, very good viewing angle and the center of the position of the luminous intensity of the point is very large. The shape of the top lens and the position of the LED chip from the top lens determine the LED viewing angle and light intensity distribution. Generally speaking the same LED viewing angle, the larger the great luminous intensity is smaller, but the cumulative luminous flux in the entire three-dimensional hemisphere remains unchanged. 10. When more than one LED is more tightly regulated emissions, its light-emitting sphere superimposed on each other, resulting in the entire light-emitting plane luminous intensity distribution is more uniform. In the calculation of luminous intensity of the display, according to the LED viewing angle and LED emission density, will be provided by the manufacturer of a large point of luminous intensity value multiplied by 30% to 90%, as the average luminous intensity of a single tube. 11. General LED light-emitting life is very long, manufacturers are generally marked as 100,000 hours or more, the actual should also pay attention to the brightness of the LED decay cycle, such as most of the UR red tubes used for automotive tail lights. Tail light UR red tube lit dozens to dozens of hours, the brightness is only half of the original. Brightness decay cycle and LED production materials process has a lot to do, generally in the case of economic conditions allow should choose to use the brightness of the slow decay of the four elements of the LED. 12. White is red, green and blue colors according to the brightness of the proportion of the mixture, when the light in the green brightness of 69%, the brightness of red is 21%, the brightness of blue is 10%, mixing the color of the human eye after the feeling is pure white. But LED red, green and blue color coordinates due to the process and other reasons can not achieve the full color spectrum of the effectiveness of the control of the primary colors, including deviations from the brightness of the primary colors to get the white light, known as color matching. 13. When the full-color LED display for the color matching before, in order to achieve a very good brightness and low cost, should try to choose the three primary colors of light-emitting intensity into a roughly 3:6:1 proportion of the LED device composed of pixels. 14. 14. White balance requires three primary colors in the same gray value of the synthesis is still pure white. 15. Primary colors, base colors. 16. Primary colors refer to the basic colors that can be synthesized into a variety of colors. The primary colors in color light are red, green and blue. If there is a deviation from the primary colors, the area in which the colors can be synthesized will be reduced, the triangles in the spectral table will be narrowed, and from a visual point of view, the colors will not only be deviated, but the richness will be reduced. For more information, you can consult Xinjiang Chuangshi Lantian Information Technology Co!