The viewing angle is when the brightness in the viewing direction drops to 1/2 of the brightness of the normal line of the LED display. The angle between two viewing directions on the same plane and the normal direction.
It is divided into horizontal and vertical viewing angles; the viewing angle is the angle between the direction in which the image content on the SMD screen can be seen and the normal line of the display screen. The best viewing angle is the angle between the direction in which the image content is clearest and the normal line, so that the content on the display can be seen just right without being flat;
What is the best viewing distance?
It is the vertical distance between the screen and the clearest position of the image content that allows you to see the content on the display screen completely without flatness:
What is the out-of-control point? How many types?
Pixels whose luminous state does not meet the control requirements are divided into three types: blind spots (also known as dead spots) and normally bright spots (or dark spots) and flash points;
What is the static driver? What is a scan driver? What’s the difference between the two?
The “point-to-point” control from the output pin of the driver IC to the pixel is called static drive, and the “point-to-column” control from the output pin of the driver IC to the pixel is called scan drive. It requires a row control circuit: It can be clearly seen on the driver board.
The static drive does not require a row control circuit, and the cost is high, but the display effect is good, the stability is good, and the brightness loss is small; the scan drive requires a row control circuit, but the cost is low and the display The effect is poor, the brightness loss is large, etc.;
What is the constant current drive? What is a constant voltage drive?
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;
What is the general aspect ratio of LED display screens?
Graphic screen: determined according to the displayed content; video screen: generally 4:3 or close to 4:3; the ideal ratio is 16:9.
How many points can a control system control?
Communication screen A card: single color, double color 1024×64; communication screen B card: single color: 896×512 double color: 896×256; DVI double color screen: 1280×768; DVI full color screen: 1024×512
What is nonlinear correction?
If the digital signal output by the computer is displayed on the LED display without correction, color distortion will occur.
Therefore, in the system control circuit, the original computer output signal is calculated through a non-linear function to calculate the signal required by the display. Since the relationship between the front and rear signals is nonlinear, we often call it nonlinear correction.
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