What's the difference between LED backlight and ordinary display
Author:Zhou Yanshan Time:2021-07-30 09:22 Browse(56)
Compared with ordinary LCD, LED display structure is better
Compared with ordinary LCD, LED display structure is betterThe basic semiconductor nixie tube is composed of seven strip-shaped light-emitting diode chips arranged according to Fig. 12.
it can realize the display of 0-9.
its specific structure includes "reflection mask type", "reflection mask type" and "light-emitting diode type" (1) the seven segment shell with reflecting cavity is usually made of white plastic.

What's the difference between LED backlight and ordinary display

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, This 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 digital tube belongs to the mixed packaging form.
it is to divide the gallium phosphide or gallium phosphide wafer into one or several LED light-emitting strips, and then stick the same seven strips on the Japanese "Kovar" frame, (3) the monolithic integrated multi bit digital display is based on the light-emitting material substrate (large wafer).
a large number of seven segment digital display graphics are produced by using the integrated circuit technology,The qualified chips are selected by scribing and pasted on the printed circuit board, the lead is drawn out by pressure welding process, and then the shell of "fisheye lens" is covered on it.
they are suitable for small digital instruments.
(4) symbol tube The manufacturing method of the meter tube is similar to that of the digital tube.
(5) the matrix tube (LED dot matrix) can also be manufactured by a process similar to that of the monolithic integrated multi bit digital displayIn terms of the display alone.
Samsung LED is better one is to use red light, Green and blue LEDs produce white light according to a certain brightness combination.
the second is the white LED with phosphor coated on the blue LED.
but there are problems in both ways.
the first one is that if a single LED is damaged.
there may be local color deviation.
the second one is that if a single LED is damaged.
there may be local low brightness The service life of LED is about 100000 hours, and the service life should be more than 10 years. However, the service life of phosphor is only about five years. If there are no other problems in the TV within 10 years, the service life of TV will be shortened because of the phosphor problem.
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