LED Panel

LED display (LED panel):

LED is light emitting diode, light emitting diodes in abbreviation, abbreviated LED. It is a semiconductor light-emitting diode by controlling the display, which probably look like that from lots of red light-emitting diodes are usually formed by the bright lights off to show character. Used to display text, graphics, images, animations, quotes, video, video signals and other information on the display screen.

Comments (33) | May16, 2010 | Edit By ERALED

LED Panel knowledge

What is the led panel?

whit is led panelLED panel into the digital display, graphic display and video display, LED matrix by blocks. LED digital display of the display device 7 yards for the digital control, suitable for production of the clock screen, the interest rate screens, showing the number of electronic display. Graphic displays can be synchronized with the computer display Chinese characters, English text and graphics; video display using micro-computer control, graphics, images, and Mao, in real-time, synchronization, clear message to the broadcast of a variety of information dissemination, but also shows two dimensional, three-dimensional animation, video, TV, VCD programs and live on. LED display shows the screen brightly colored, three-dimensional sense of strong, static, such as painting, dynamic, such as film, widely used in financial, tax, business, post, sports, advertising, industrial enterprises, transport, education system, stations, docks, airports, shopping malls, hospitals, hotels, banks, securities markets, construction market, auction houses, industrial enterprises in management and other public places. 2.5m wide and brown and the transparent resin plate by grinding into the business of Wuxi is the successful installation!! Greatly improve the overall effectiveness of LED, the effective time of up to 20 years, high temperature reached 150 degrees, low temperature up to -45 degrees, raw material use lexan resin.

LED screen can show changes in the numbers, text, graphics and video; not only can be used in the indoor environment can also be used for outdoor environment, with a projector, TV wall, LCD screen can not match advantage.

LED reason attention has been attached and rapid development, is that it itself has the advantage inseparable. To sum up these advantages are: high brightness, low voltage, power consumption, small size, long life, impact resistance and stable performance. LED's development prospect is extremely broad, the current is moving in a higher brightness, higher weather resistance, higher luminous density, higher luminous uniformity, reliability, full color of direction.>

LED display superior performance:

Luminescence intensity in the visual distance of the screen surface to direct sunlight, the display clearly visible.

Super grayscale control with the 1024-4096 level gray scale control, display more colors 16.7M colors vivid, three-dimensional sense.

Static scan technology uses static latch scan mode, power-driven, fully guaranteed brightness.

Automatic brightness adjustment with automatic brightness adjustment function, in different light conditions for optimal playback.

Full use of imported large scale integrated circuits, reliability has greatly improved ease of debugging and maintenance.

Work around the clock adapt to the harsh outdoor environments, corrosion, waterproofing, moisture, lightning, earthquake and overall performance, cost-effective, showed good performance, pixel barrel can be used P10mm, P16mm and other specifications.

Advanced digital video processing, distributed scanning technology, modular design / static constant current drive, automatic brightness adjustment.

Ultra Bright Pure Pixels.

Video screen clear, no jitter and ghosting, to prevent distortion.

Video, animation, graphics, text, pictures and other information display, networking, display, remote control.

LED color and Technology

led color and technology1.Different manufacturing LED materials, can produce photons with different energies in order to control the wavelength of light emitted LED, that is, spectral or color.

2.History of the first LED material is used in arsenic (As) of gallium (Ga), the PN junction forward voltage drop (VF, can be understood as light or voltage) is 1.424V, issued light for the infrared spectrum. Another commonly used material for the LED phosphorus (P) of gallium (Ga), the PN junction forward voltage drop to 2.261V, issued for the green light.

3. Based on these two materials, the early use of LED industry GaAs1-xPx materials Tu-structure, in theory, can be produced until the green light from the infrared light of any wavelength within the LED, subscript X on behalf of phosphorus to replace the percentage of arsenic. Generally through the PN junction voltage drop can determine the wavelength of LED colors. Which typically have GaAs0.6P0.

4 red LED, GaAs0.35P0.65 orange light LED, GaAs0.14P0.86 the yellow LED and so on. Because of the manufacturing using gallium, arsenic, phosphorus three elements, so-called three elements of these LED light tubes. And GaN (gallium nitride) blue LED, GaP green light LED and GaAs infrared LED, LED known as the second element. The latest process is mixed with aluminum (Al), calcium (Ca), indium (In) and nitrogen (N) the four elements the four elements of materials AlGaInN the four elements of LED, you can cover all the visible and ultraviolet part of spectral range of light. Luminous intensity:

4. Luminous intensity measurement unit illumination units (lux Lux), luminous flux unit (lumen Lumen), luminous intensity unit (Candlelight Candle power)

5. 1CD (candlelight) means the total radiation of objects, in the Platinum freezing point temperature, each one sixtieth of the luminous intensity square centimeter area. (Formerly referred to a diameter of 2.2 cm, weight 75.5 grams of the whale You Zhu, 7.78 grams per hour, burning, flame height of 4.5 cm along the horizontal direction of the luminous intensity).

6. 1L (lumens) means 1 CD candle light in the distance 1 cm area of one square centimeter in the plane of the flux.

7. 1Lux (lux) that 1L the flux evenly distributed in the 1 square meter area of the illumination.

8. Generally active unit of luminous intensity light candles with CD, such as incandescent, LED, etc.; reflected or penetrated by an object luminous flux unit lumen L, such as LCD projectors, etc.; the illumination unit lux Lux, generally used for photographic and so on. Three types of measurement units are equivalent in value, but need to understand from different perspectives. For example: If an LCD projector brightness (luminous flux) of 1600 lumens, the projector to the total reflection of the screen size of 60 inches (1 square meter), its illumination of 1600 lux, I assumed the light from the light source 1 cm, the light exit area of one square centimeter, while the intensity of light emitting port 1600CD. The real LCD projectors because the loss of light transmission, reflectance or transmittance film loss and uneven distribution of light brightness will be greatly reduced, generally 50% of the efficiency is good.

9. Actual use, the light intensity calculation is often relatively easy to use mapping data units or change the use. LED sign for the general use of this active light CD / square meter as the unit of luminous intensity, and with the observed angle of auxiliary parameters, which is equivalent to screen the surface of the illumination unit lux; this value and the effective display screen area of body multiplied by the entire screen in the best perspective on the body of the luminous intensity, assuming Screen luminous intensity of each pixel in the corresponding space constant, this value can be considered the whole screen is luminous body. General outdoor LED display is required to achieve 4000CD / square meter or more before the brightness of the sun under the ideal display. Common indoor LED, the maximum brightness at 700 ~ 2000 CD / square meters. LED luminous intensity in a single CD unit, and with a perspective parameters, light intensity and the LED color does not matter. Single tube of luminous intensity mCD from several mCD to 5000 range. LED manufacturers are given luminous intensity at 20mA LED current under that light, the best angle of view and the center of the luminous intensity of the maximum point. LED package when the top of the lens shape and the LED chips from the top of the location of the decision of the LED lens angle and intensity distribution. Generally speaking, the greater the angle the same LED, the maximum luminous intensity of the smaller, but accumulated throughout the three-dimensional surface of the flux the same hemisphere.

10. When more than one LED emission rules more closely, the superposition of luminous sphere, resulting in the emission plane luminous intensity is more evenly distributed. In calculating the luminous intensity of the display, the required angle and the LED under the LED emission density, manufacturers will provide the maximum point of luminous intensity value multiplied by 30% to 90%, and the average luminous intensity as a single tube.

11. Generally very long life LED's light, the plants are generally identified more than 100,000 hours, the actual should also pay attention to LED brightness decay cycle, as most of the UR for automotive taillights lit red tube more than a dozen to a few hours after brightness of only half of the original. Production cycle and the LED brightness decay process has a lot of materials, general economic conditions in the permit should be selected brightness slow decay of the Four Elements LED. Color, white balance:

12. White is the color red, green and blue mixture ratio by the brightness, the brightness when the green light to 69%, 21% brightness of red, blue, 10% brightness, color mixing posterity eyes feel is pure white. However, LED red, green and blue color coordinate process and other reasons for not achieve all chromatographic results, which control the primary colors, including a deviation of the brightness of colors are white light, called color.

13. As for the full-color LED screen for color front, in order to achieve the best brightness and lowest cost, should try to select the RGB luminous intensity into a roughly 3:6:1 ratio of LED devices composed of pixels.

14. White balance requirements of three primary colors in the same tone gray value of the synthesis of the still as pure white.

15. Primary colors, color:

16. Primary colors that can synthesize a variety of colors of the basic colors. Shade in the colors red, green, blue, the next picture shows the spectrum table, the table of the three vertex colors as desired wavelength. If the colors are biased, can be synthesized in the color of the area will decrease, spectral triangular table will be reduced, from the visual point of view, the color deviation will not only enrich the level of reduction.

17. LED issued a red, green and blue light wavelengths according to their different characteristics and can be divided into purple, pure red, orange, orange, orange, yellow, green, pure green, green, blue and green, blue, violet, etc. , orange, green, blue and purple than pure red, pure green, blue much cheaper price. The three primary colors in the green most important, because the white in the green accounts for 69% of the brightness, and color at the center horizontal row of the list. Therefore, the color of purity and price trade-off between Zhengzhou, the relationship between the Bank of Communications, Information display, the green is considered the object of focus.

 

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