LED LCD display structure

　　The basic semiconductor digital tube is arranged by seven strip -like light diode chips according to Figure 12. It can be achieved by 0 to 9. Its specific structures include "reflex", "strip seven -stage" and "single -piece integrated multi -digit digital", etc.

　　(1) The reflector -type digital tube is generally made of white plastic into a seven -stage shell with a reflective cavity, and a single LED is pasted on the printing circuit board with the seven reflex cavity of the reflector. The center position is the LED chip. Before installing a reflector, use a pressure welding method to connect the silicon aluminum wire or metal lead between the corresponding metal strips on the chip and the printing circuit, drip in the epoxy resin in the reflex cover, and then put the printing circuit with a chip Plate and reflector are bonded, and then solidified.

　　There are two types of packaging of reflector -type digital tubes: space and real seal. The real -sealing method uses scattered and dye epoxy resin, which is more used for one or two -bit device. The air sealing method is to cover the filter and uniform film on the top. In order to improve the reliability of the device, it must be coated with transparent insulating glue on the chip and bottom plate, which can also improve the light efficiency. This method is generally used for more than four digits (or symbol display).

　　(2) The seven -stage digital tube is a mixed package form. It is to make the phosphorized or phosphorized cymbal of the tube core into one or several LED light bars in the inside, and then stick the same seven to the Japanese fonts The craftsmanship is connected to the internal lead, and then wrapped in epoxy resin.

　　(3) Single -piece integrated multi -digit digital display is on the luminous material substrate (large circle), using the integrated circuit process to make a large number of seven digital display graphics, select the qualified chip through the chip, and attach it to the printing circuit to the printing circuit. On the board, the leader is used to lead to the leader, and then covered with the "fish eye lens" shell. They are suitable for small digital instruments.

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