LED product terminology

- Apr 07, 2019-

1. What is LED?

LED is the LIGHT EMITTING DIODE. The LED industry in the display industry refers to LEDs that emit visible bands.

2, what is a pixel

The minimum illumination unit of the LED display has the same meaning as the pixel mentioned in the ordinary computer display.

3, what is the pixel distance (point spacing)

The center distance between two adjacent pixels;

4. What is the LED display module?

A small unit consisting of several display pixels that are structurally independent and can form an LED display. Typical 8*8, 8*7, etc.

0 3D stage led ball

5. What is DIP?

DIP is the abbreviation of DOUBLE IN-LINE PACKAGE, dual inline assembly

6. What is SMT? What is SMD?

SMT is the surface assembly technology (short for SURFACE MOUNTED technology), which is currently the most popular technology and process in the electronics assembly industry;

SMD is a surface mount device (short for surface mounted device)

7. What is the LED display module?

Basic unit with circuit and installation structure, display function, and display function by simple assembly

8, what is the LED display

a display screen composed of an array of LED devices by a certain control method;

Led-display-4

9. What is the plug-in module, what are the advantages and disadvantages?

It means that the lamp of the DIP package passes the lamp pin through the PCB board, and the tin is filled in the lamp hole by soldering. The module made by this process is the plug-in lamp group, and the advantages are: high brightness, good heat dissipation, and the disadvantage is The pixel density is small.

10.What is a surface mount module? What are the advantages and disadvantages?

The surface mount is also called SMT. The SMT packaged lamp is soldered to the surface of the PCB board through the soldering process. The lamp pins do not need to pass through the PCB board. The module made by this process is called the surface mount module. The advantage is that the display effect is good. The pixel density is large, suitable for indoor viewing: the disadvantage is that the brightness is not high enough, and the heat dissipation of the lamp itself is not good enough.

11. What is the sub-surface module? What are the advantages and disadvantages?

Sub-surface label is a product between DIP and SMT. Its LED lamp has the same package surface as SMT, but its positive and negative pins are the same as DIP. It is also soldered through the PCB during production. The advantages are: high brightness, good display effect, disadvantages: complicated process and difficult maintenance;

3d pixel led ball led control(3)

12. What is 3-in-1? What are its advantages and disadvantages?

It means that the SMT lamps of RGB three different color LED chip packages are vertically juxtaposed at a certain interval, which not only has all the advantages of 3-in-1, but also solves various shortcomings of three-in-one: complicated process and difficult maintenance .

13. What is three-in-one?

The RGB three independent packaged SMT lamps are vertically juxtaposed at a certain interval, which not only has the advantages of 3-in-1, but also solves the various shortcomings of the three-in-one:

14, what is the double primary color, pseudo color, full color display

Different color LEDs can be used to form different display screens. The two primary colors are composed of red, green or yellow and green. The pseudo color is composed of three different colors: red, yellow green and blue. The full color is red. , pure green, pure blue composed of three different colors.

15. What is the brightness of the light

The intensity of light emitted by the unit area of the LED display, in units of CD/square meter, is simply the intensity of light emitted by a square meter display;

16.What is the brightness level? 

The number of levels of manual or auto-adjustment of the brightness of the entire screen between the lowest and highest brightness.

17, what is the gray level

Technical processing levels between the darkest and the brightest at the same brightness level

18, what is the maximum brightness

Under certain ambient illumination, each of the primary colors of the LED display is at the maximum brightness and maximum gray level;

19. What is a PCB?

PCB is (short for printed circuit board) printed circuit board

20 What is BOM?

BOM is the (bill of material) bill of materials

21: What is white balance and what is white balance adjustment?

The white balance we refer to refers to the balance of white, that is, the balance of the brightness ratios of the three colors of RGB; the adjustment of the brightness ratio of the three colors of RGB and the adjustment of the white coordinates is called white balance adjustment;

22: What is contrast?

The ratio of the maximum brightness of the LED display to the background brightness under a certain ambient illumination.

23, what is the color temperature

When the color emitted by the light source is the same as the color of the black body at a certain temperature, the temperature of the black body is called the color temperature of the light source.

24 What is the frame change frequency?

The number of times the display screen information is updated in a unit time;

25, what is the refresh rate

The number of times the display screen is repeatedly displayed by the display in unit time;

26: What is the perspective? What is the angle of view? What is the best perspective?

The viewing angle is when the brightness of the viewing direction drops to 1/2 of the brightness of the normal of the LED display. The angle between the two observation directions of the same plane and the normal direction. Divided into horizontal and vertical perspectives;

The angle of view is the angle between the direction of the image on the display and the normal to the display.

The best viewing angle is that you can just see the content on the display, and it is not flat, the angle between the clearest direction of the image and the normal line;

JD42 led pixel dot (6)

27: What is the best line of sight?

It is the ability to see the content on the display just in full, and it is not flat, the vertical distance of the image is the clearest position relative to the screen:

28: What is the point of loss? Divided into several!

The pixel points whose illumination state does not match the control requirements are divided into three types: blind point (also known as dead point) and constant bright point (or dark point);

29. What is a static driver:? What is a scan driver? What is 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. The control of "point-to-column" from the output pin of the driver IC to the pixel is called scan drive. He needs the line control circuit: The driver board can be clearly seen: the static drive does not need a row control circuit, the cost is high, but the display effect is good, the stability is good, the brightness loss is small, etc.; the scan driver needs the line control circuit, but the cost is low, the display Poor effect, brightness loss, etc.;

30. What is constant current drive? What is a constant voltage drive?

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