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How To Revise LED Display Lights Point-by-point ?

Shenzhen Lights Technology Co.,Ltd | Updated: Jan 13, 2016

LED display is composed of thousands of pieces of LED light-emitting diodes, a pixel LED display on the R, G, B three-color diodes to display text, pictures, graphics, images, video animation. LED display technology advantages previously compared to the impact of the LED display is not subject to size, can be done on a few dozen meters of size, LED display is widely used in the city center square, and a number of meeting rooms, LED display achievable brightness LCD display and other far unattainable.


Huge LED display lights, causing a LED display consistency effects are very poor. LED manufacturer in accordance with standard industry classification, the same batch of LED brightness LED lamp factory error can reach 20% -40%, and the color error is 5nm, and the difference in brightness between the human eye can tolerate at 5% or less, display color difference within 1-2nm range, so there is no correction of the display is poor, far below the requirements of the human eye, and, along with long-term use LED display, external LED lamp grease layer will be oxidized, so that the overall brightness of the LED decreases, the color yellow, the display continues to deteriorate, Huaping, mosaic and so on.


With the widespread use of LED display, for some high-profile occasion for LED display (such as conference rooms, etc.), in order to improve the display, LED display correction technology is urgently needed. LED display correction is through a series of algorithms to identify each light point, calculate information for each point of light, then the statistics of their differences, to generate a correction coefficient table, in order to control the LED display of each light display state, so that each lamp display converge.


LED luminescence properties


LED (Light Emitted Diode) is a semiconductor pn junction structure or the like when the forward current is passed through a high efficiency made visible or near infrared light devices. Light-emitting diode chip core component of the P-type semiconductor and N-type semiconductor between the P-type semiconductor and N-type semiconductors have a transition layer, called the PN junction.


In certain semiconductor materials, PN junction in the forward voltage, minority carrier injection when the number of carrier recombination will the excess energy in the form of light and released, thereby converts electrical energy directly into light. PN junction reverse voltage, minority carrier injection is difficult, it is not light; when the PN junction in the forward voltage, the semiconductor wafer can be emitted from the ultraviolet to infrared light of different colors, light intensity and current.


PWM modulation


Change the LED current can change the LED brightness. However, due to R, G, B three different current characteristic color tubes, directly regulated current will cause the proportion of R, G, B three-color changes, leading to adjust the brightness will also change color, so we do not take to adjust the current approach to control the brightness of LED lights, here we use PWM modulation to control the LED lamp brightness.


Technical pulse width modulation (PWM) control of LED brightness is a widely used, its principle is based on Talbot's law. PWM is different from changing the current to adjust the brightness of LED lights, which is obtained by controlling the LED lights winking to control the brightness of LED lights, then the current will not change, nor color deviations occur. 1, through LED lights flash at high speed, the human eye can not detect the lights flashing, will feel the light is lit or darkened; for example, we control the LED lights use one 10s 1/10 The time for the lighting, of course, this is a high-speed process of change, the process will produce thousands 10s pulse, the human eye the most comfortable, then we get the brightness of LED lights is the brightness of the 10s has been lit 1 / 10.

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