LED basic knowledge quiz(part 2)
14,what is the dual color, pseudo color, full-color display?
With different colors of light-emitting diodes can be composed of different screen, double color is red, green or yellow green two colors,pseudo color is red, yellow, blue consisting of three different colors,full color is red , pure green, blue consisting of three different colors;
15, What is the luminous intensity?
LED display light intensity emitted per unit area, the unit is cd / ㎡, it simply is the light intensity emitted by one square meter display;
16: what is the level of brightness?
The entire screen brightness at the lowest to the highest brightness between manual or automatic adjustment of the series;
17: what is the gray level?
Under the same brightness level, the display technology from the darkest to the brightest among processing stages;
18: what is the maximum brightness?
Under certain environmental illumination, LED display primary colors at the maximum brightness and the maximum gray scale level;
19, What is PCB?
PCB is (Printed Circuit Board abbreviation) printed circuit board;
20, What is BOM?
BOM (Bill of material abbreviation) Bill of material;
21, what is the white balance? What is the white balance adjustment?
We said white balance, refers to the white balance, i.e., R, G, B three color brightness of 3: 6: 1 ratio balanced;
22,what is the contrast?
Under certain environmental illumination, ratio of LED maximum brightness and LED background brightness;adjust R, G, B three color brightness ratio and the coordinates of white, called for white balance adjustment;
23, what is color temperature ?
The color and the blackbody of source emitting light to Radiation light is same at a temperature
temperature of Blakbody called the color temperature of light source.
24, what is change the frequency of frame?
Screen information update times in unit time.
25,what is the refresh frequency? ;
Display information is repeated time by display screen.
26,what is the view point? What is a perspective? What is best viewing point?
Viewing point is the brightness of the viewing direction to decrease the brightness of the LED display of half the normal direction, and the angle formed with a plane two observation direction and the normal direction of the. Divided into horizontal and vertical perspective; Perspective is just to be able to see the direction of the display image content on the display, and the angle formed by the normal display;The best viewing point is just able to see the full content on the display ,meanwhile without color cast, the clearest image content with the normal to form an angle;
27, what is the best line of sight?
The best viewing point is just able to see the full content on the display ,meanwhile without color cast, the clearest image content position relative to the vertical distance is the best line of sight
28, what is a point out of control? Several minutes?
Pixel lighting and control requirements do not match; out of control points are divided into: blind spot (or called dead), often highlights (or dark), flash point;