Color uniformity of LED display
Color uniformity of LED display
Many people go to buy LED display to evaluate the product is good or bad when the most indicators may be the color of it. LED full-color display, LED electronic large screen and so on to have a good visual effect. Which color occupies an important position, then how to make the LED display chromaticity more uniform, reasonable it, the following summary written method for your reference.
LED display chromaticity uniformity problem has always been a major problem plaguing the industry, the general view that the brightness of the LED is not uniform can be a single point of correction to improve the brightness uniformity. And chromaticity unevenness can not be corrected, can only be improved by subdividing and screening the LED color coordinates.
Manufacturing large screen, first of all, according to the brightness indicators to choose optional light-emitting or display module, followed by the selection of products according to the intensity of red, green, blue color to determine the color as the basis, usually a low brightness ratio as a luminance reference, when the baseline maximum luminance adjusted, the other (two-color) or 2 (full-color). Two-color displays, large in most cases, green as a reference, adjusting the operating current of the red 2 transistors. Generally is to reduce the operating current to balance the yellow color, adjust the standard, such as reducing the brightness of the entire display screen. Display screen color adjustment to the optimal state of the balance, the screen brightness will be reduced. If the display screen to achieve the brightness requirements, each color will reach the maximum brightness, and then out of balance, for example: dual-color screen yellow or red, green. We found that even the first international brands with leadership also have a greater wavelength deviation of color saturation and bias, and the range of deviation greatly exceeds the human eye on the green color difference threshold, therefore, chromaticity uniformity correction is important. Light-emitting colors and light-emitting efficiency and light-emitting materials and production processes, now widely used are red, green, blue three. Because light-emitting diode display low operating voltage, can be active light and have a certain brightness, brightness and voltage (or current) regulation, shock resistance, vibration resistance itself, long life, so in large display devices. No other display and light-emitting diode display mode competitors before.
LED light-emitting material applied to the display has the following forms:
1. Light-emitting diode dot matrix module composed of diversified wafers to form light-emitting moment arrays, using epoxy resin sealed in a plastic shell. Fitting line column scanning drive, easy to form a high-density display for indoor display.
2. SMD light-emitting diode lamp (or light-emitting diode) is a light-emitting lamp welding form of packaging, can be used for indoor full-color display, can be realized in a single point of maintenance, effectively overcome the mosaic phenomenon.
3. Light-emitting lamp consists of a light-emitting diode chip, reflective Bowl metal anode, cathode, metal structure, outsourcing the ability to concentrate light epoxy resin shell. Provides one or more (different colors) to form a single lamp basic pixel, due to high brightness, used for outdoor displays.
LED display chromaticity uniformity problem has always been a major problem plaguing the industry, the general view that the brightness of the LED is not uniform can be a single point of correction to improve the brightness uniformity. And chromaticity unevenness can not be corrected, can only be improved by subdividing and screening the LED color coordinates.
Manufacturing large screen, first of all, according to the brightness indicators to choose optional light-emitting or display module, followed by the selection of products according to the intensity of red, green, blue color to determine the color as the basis, usually a low brightness ratio as a luminance reference, when the baseline maximum luminance adjusted, the other (two-color) or 2 (full-color). Two-color displays, large in most cases, green as a reference, adjusting the operating current of the red 2 transistors. Generally is to reduce the operating current to balance the yellow color, adjust the standard, such as reducing the brightness of the entire display screen. Display screen color adjustment to the optimal state of the balance, the screen brightness will be reduced. If the display screen to achieve the brightness requirements, each color will reach the maximum brightness, and then out of balance, for example: dual-color screen yellow or red, green. We found that even the first international brands with leadership also have a greater wavelength deviation of color saturation and bias, and the range of deviation greatly exceeds the human eye on the green color difference threshold, therefore, chromaticity uniformity correction is important. Light-emitting colors and light-emitting efficiency and light-emitting materials and production processes, now widely used are red, green, blue three. Because light-emitting diode display low operating voltage, can be active light and have a certain brightness, brightness and voltage (or current) regulation, shock resistance, vibration resistance itself, long life, so in large display devices. No other display and light-emitting diode display mode competitors before.
LED light-emitting material applied to the display has the following forms:
1. Light-emitting diode dot matrix module composed of diversified wafers to form light-emitting moment arrays, using epoxy resin sealed in a plastic shell. Fitting line column scanning drive, easy to form a high-density display for indoor display.
2. SMD light-emitting diode lamp (or light-emitting diode) is a light-emitting lamp welding form of packaging, can be used for indoor full-color display, can be realized in a single point of maintenance, effectively overcome the mosaic phenomenon.
3. Light-emitting lamp consists of a light-emitting diode chip, reflective Bowl metal anode, cathode, metal structure, outsourcing the ability to concentrate light epoxy resin shell. Provides one or more (different colors) to form a single lamp basic pixel, due to high brightness, used for outdoor displays.