What is led display?
Author:Wang Guilan Time:2021-06-08 13:30 Browse(75)
Through proper connection (including series connection and parallel connection) and proper optical structure of LED chip. The luminous section of the luminous display can be formed
Through proper connection (including series connection and parallel connection) and proper optical structure of LED chips,
the light-emitting segment or light-emitting point of light-emitting display can be formed.
from these light-emitting segments or light-emitting points, digital tube, symbol tube, meter tube, matrix tube, level display tube and so on can be formed.

What is led display?

generally, digital tube, symbol tube The meter tube is called stroke display.
and the stroke display and matrix tube are called character display.
(1) the basic structure of LED display is composed of seven strip-shaped LED chips arranged according to figure 12.
it can realize the display of 0-9.
its specific structure includes "reflection mask type" and "light-emitting diode type" (1) the seven segment shell with reflecting cavity is usually made of white plastic.
a single LED is pasted on the printed circuit board opposite to the seven reflecting cavities of the reflecting cover, The center of the bottom of each reflector is the LED chip.
before installing the reflector.
connect the chip and the corresponding metal strip on the printed circuit by pressure welding φ thirty μ Then, the printed circuit board with chip is aligned and bonded with the reflector, Then curing.
there are two kinds of packaging methods of reflective cap type digital tube: empty sealing and solid sealing.
the solid sealing method uses epoxy resin with scattering agent and dye.
it is widely used in one or two position devices.
the empty sealing method is to cover the filter and uniform film on the top.
in order to improve the reliability of the device, transparent insulating adhesive must be coated on the chip and the bottom plate, It can also improve the optical efficiency.
this method is generally used for digital display (or symbol display) with more than four digits.
(2) the strip seven segment nixie tube belongs to the mixed packaging form.
this method is generally used for digital display (or symbol display) with more than four digitsThe chip is made of gallium phosphide or gallium phosphide wafer.
it is divided into one or several LED light-emitting strips, and then the same seven strips are pasted on the Japanese "Kovar" frame, and the inner leads are connected by pressure welding process, (3) the monolithic integrated multi bit digital display is made on the light-emitting material substrate (large wafer).
a large number of seven segment digital display graphics are produced by using the integrated circuit process, and the qualified chips are selected by slicing, and then pasted on the printed circuit board, and the leads are led out by the pressure welding process, They are suitable for small-scale digital instruments.
(4) symbol tube (5) the matrix tube (LED dot matrix) can also be made by a process similar to that of monolithic integrated multi bit digital display.
(2) classification of LED displays (1) high score by character: the minimum word height of stroke display is 1 mm (the word height of monolithic integrated multi bit digital tube is generally 2-3 mm).
other types of stroke display It can be up to 12.7mm (0.5in) or even hundreds of mm.
(2) it can be divided into red, orange, yellow and green according to color.
(3) it can be divided into reflective hood type, reflective hood type, reflective hood type and reflective hood type according to structure (4) there are two ways to connect the electrodes of each light-emitting segment, namely, common anode and common cathode.
(3) the parameters of LED display are based on LED.
therefore, its light, light, light, light, light, and so on Most of the electrical characteristics and limiting parameters are the same as those of LED.
however, because the LED display contains multiple LEDs, the following special parameters are required: 1,The forward current of each segment is different, so the luminous intensity of each segment is different.
the ratio of the maximum value to the minimum value of luminous intensity of all segments is the luminous intensity ratio.
the ratio can be between 1.5 and 2.3.
the maximum value can not exceed 2.5.
2. Pulse forward current if the typical forward DC working current of each segment of stroke display is if.
under the pulse, the maximum value of the maximum value can not exceed 2.5.
2, The forward current can be much larger than if.
the smaller the pulse duty cycle is.
the larger the pulse forward current is.
Shenzhen Sitong Display Technology Co., Ltd. is a reference for professional production of LED display www.ledwang.com.
It's the kind on the bank's door.
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