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Answers to important LED terms (2)
Oct 13, 2022 View : 1322

error detection

Error detection is based on point-by-point detection of the system. When detecting, there is no need to turn off the display and light up each LED light. Moreover, the system can be remotely controlled, so there is no need to go to the site or repair personnel. You can know the coordinate data of each bad pixel on site

Point by point correction

The principle of point-by-point correction is to measure the brightness of each 1ed lamp under the same working conditions, then calculate the correction coefficient of each lamp according to the set target value, and use the coefficient to adjust the amplitude or duty cycle of the driving current so that The brightness of each lamp reaches the set target value. After correction, the brightness of the display will decrease, but the overall effect will be improved.

Color gamut diagram (CiE)

In order to intuitively represent the concept of color gamut, CIE International Illuminating Institute has developed a method for describing color gamut: CIE-xy chromaticity diagram. In this coordinate system, various requirements are not

The color gamut range that a display device can express is represented by a triangular area composed of RGB three-point lines. The larger the area of the triangle, the larger the color gamut range of the display device.

power

Electrical power is used to express the speed of consuming electrical energy. Electrical power is represented by P. Its unit is Watt (Wat). The symbol for watt (Wa) is W.

The maximum power of our display screen refers to the maximum input power required by the display screen when it is working, that is, the power required by the display screen when the white brightness value of the display screen reaches the highest value. Average power refers to the average power required by the display during a certain period of time during normal operation. It is related to the content played by the display. Average power is 30-60% of maximum power

dynamometer

A power meter is an instrument used to measure the power of a display screen. It can quickly and intuitively display the voltage, current, power consumption, etc. of the box.

Drive mode

Constant current refers to the current value specified in the constant output design within the allowed working environment of the driver IC; constant voltage refers to the voltage value specified in the constant output design within the allowed working environment of the driver IC.

1. There are two driving methods: constant current driving and constant voltage driving. Constant current drive is better and more expensive (more circuit boards and chips allow the current to remain constant, increasing the service life and stability of the LED display)

2. The difference between dynamic control and static control: Dynamic control saves the cost of the driver chip and electricity (the brightness is small and the power is small). For the same specifications and the same lamp chip, static scanning is brighter than dynamic scanning.

3. Commonly used scanning methods include the following, /16 scan, 1/8 scan, 1/4 scan, static scan. The first three are dynamic scans, 16 lines for one scan, 8 lines for one scan, and 4 lines for one scan. sweep

4. The working principle of scanning is to use the visual retention characteristics of the human eye to light up each row of the LED display screen within a short period of time. That is, the lights on the screen are not actually all bright, but they appear to us to be all bright. It is the same as animation. When it is slow, it looks like one picture after another. When it is fast, it looks like it is moving. The static screen corresponds to the scanning screen. The static screen refers to the LED display screen that displays text and images. , video, the light points on the LED display light up at the same time when displaying; instead of using the visual persistence characteristics of the human eye like a scanning screen, each row of the LED display screen is changed in a short period of time. Light up respectively. As we all know, the LED display screen is driven by the duty cycle. Therefore, the brightness of the display has a great relationship with the lighting time period. Therefore, when the brightness of the same light-emitting tube is the same, the static screen It is brighter than the scanning screen, so static screens are often used outdoors when high-brightness display is required, while scanning screens are often used indoors when brightness requirements are not high to save driving costs. However, with the continuous development of LED material technology Mature, the brightness of LED light-emitting tubes continues to increase. Scanning methods are now also used to make LED displays outdoors to save costs. Of course, using a scanning screen outdoors has very high requirements for the control and drive parts, and the performance requirements for the drive chip are also extraordinary.



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