Led Guardrail Light Diode Closure
LED is an emitting device can direct
convert electrical energy into visible light and radiation Rigid flex PCB, because of its low
operating voltage, power consumption, high luminous efficiency, light response
time is very short, pure light color, solid structure, shock, vibration stable
and reliable performance, light weight, small size, low cost range of
characteristics, and its rapid development of mass production is now able to
segment a variety of colors throughout the visible spectrum, high-brightness,
high-performance products. Made of red, green, orange, yellow LED production
accounts for about 12% of the world's total, "fifth" period the industry goal is
to achieve an annual output of 30 billion level of production, achieving high
brightness of the LED epitaxial wafers AiGslnP and chip high-volume production,
annual output of more than 1 billion of red, orange, yellow super bright LED
die, the key breakthrough in GaN materials technology, blue, green, white LED's
in mass production.
Link in the LED industry, the upstream substrate LED
chip and the substrate is produced, the middle reaches of the industry into the
design and manufacture of LED chip production, downstream owned LED packaging,
testing, research and development of low thermal resistance, excellent optical
characteristics, packaging technology is highly reliable New LED to utility, to
market the only way to achieve industrialization, in a sense is to connect
industry and the bond market, only to be packaged LED terminal products to the
market practice in order for the customer provide services to the industrial
chain of interlocking, seamless flow.
Since the 90s in the last century,
LED chips and materials made a number of breakthroughs in technology research
and development, transparent substrate ladder structure, texture, surface
structure, flip chip structure, the commercialization of high brightness (1cd or
more) of red, orange, yellow , green and blue LED products have asked the city
began in 2000 in low, medium and light flux to get the special application.
LED's on the middle reaches of industry has been unprecedented attention to
further promote the downstream packaging technology and industrial development,
the structure of different forms and sizes of packaging, different color LED die
and the color or three color combinations, can produce a variety of series,
varieties, specifications of the product.
LED package structure of the
type of product is based on light colors, chip material, brightness, size and
other characteristics to classify the case. General constitute a single die
light source, a number of the die assembly generally constitute a surface light
source and line source for information and display with status indicators, LED
displays are also using multiple die, die by the appropriate connections
(including series and parallel) with the appropriate combination of optical
structure to form light-emitting section and light-emitting display points.
Gradual replacement of surface mount LED to pin type LED, a more flexible
application design, LED display market has been in the possession of a certain
share, to accelerate the trend. Some solid lighting products to market, become
the next LED in the long-term development.
Pin type LED lead frame
package for various packages used a pin shape is successfully developed the
first package on the market structure, number of species range, technology
maturity, high reflective layer within the package structure and continues to
improve. By most standard LED display industry, customers believe is the most
convenient and most economical solution, placed in a typical traditional LED
0.1W input power can withstand the encapsulation within the 90% of the heat is
from the negative pin distributed to the PCB board rack, and then released into
the air, how to reduce the working pn junction temperature rise is packaged with
the application must be considered. Encapsulation materials, high temperature
curing epoxy resin and more Prototype
PCB, its light performance, process adaptability, high reliability, can be
made transparent and colored transparent colored or colorless or colorless
scattering scattering lens package different lens shape constitute a variety of
shapes and sizes, for example, round by diameter into 2mm, 3mm, 4.4mm, 5mm, 7mm
and several species of different components of epoxy resin can produce a
different glow. There are many different color light source package structure:
ceramic base epoxy resin has good temperature performance, pin can be bent into
the desired shape, small size; metal base plastic reflector-type package is an
energy saving light suitable for use instructions for power; flash-type
oscillator circuit chip and the CMOS LED die-packed, self-produced a strong
visual impact of the flashing light; color model by two different colors of
light-emitting die form, packaged in the same ring epoxy resin lens, in addition
to color outside the color can be mixed to obtain a third, in the large screen
display system is extremely broad, and can be composed of two-color display
packaging; voltage current source chip and the LED will die Combination package,
5 ~ 24V direct replacement of various voltage indicator. LED surface light
source is more than the die bonding requirements in the micro-location on the
PCB board, cover with plastic reflector box and the formation of epoxy potting,
PCB board design to determine the different arrangement and connections outside
the lead, with double row straight such as interpolation and single in-line
structure. Point, surface light source package has been developed hundreds of
shapes and sizes for market and customer choice.
LED digital tube LED
display could be tube or meters words, symbols, tubes, rectangular tubes, a
variety of many products, Chen, from the actual needs of the design into various
shapes and structures. Digital control, for example, a reflector-type,
single-chip integrated, single seven-segment type, and so three package
structures, connections are common anode and common cathode are two, one is
often said that digital tube, two or more commonly known as the monitor.
Reflector type with a font is large, material saving, hybrid package assembly of
flexible features, usually with white plastic made into seven sections of the
cavity with a reflector shaped shell, a single LED die bonding with the seven
reflector reflector alignment of the PCB board to each other, each reflecting
the center of the bottom cavity is formed by light-emitting die area, using wire
bonding method for bonding, epoxy instillation in the reflector, and glue the
die of the PCB board adhesion to the bit, and then curing Serve. Reflector-type
is divided into two kinds of air sealing and real closure, the former agent with
the dye by scattering epoxy resin, used for flat, two-bit devices; which cover
filter and even film, and in the die and coated transparent plastic insulation
on the floor, improve the efficiency of light, generally used for more than four
figures. Monolithic integrated chip in the light-emitting materials, a large
number of segment digital display graphics production die, and then split into
single-chip graphics dicing die, bond, bonding, packaging with the lens
(commonly known as "fish eye" lens) casing . Single seven-segment type will have
a good production of large area LED chips (cheap led lights), containing a plan
or just cut into the core of the light bar, so the same glyph seven bond can be
attacked in the digital shelves, after bonding, epoxy resin encapsulation
composition. Monolithic, single-type is characterized by miniaturization, can be
dual in-line package, mostly for products. LED Bargraph display circuit board in
the 106mm length to accommodate just 101 core (up to 201 just core), is a
high-density packaging, the use of optical refraction, the light source through
the transparent casing 13 ~ 15 raster imaging, Just completion of each core from
the point to the line display, packaging technology is more complex. from: led
bulb light
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