Advantage in LED display and brightness judgment method resolution
by Li Jjanedan Replacement laptop batteryLED display superiority characteristic
1,
the area of ductility, large LCD area is difficult to achieve seamless
splicing, LED display can be arbitrary extension, and realize seamless
splicing.
2,
LCD, plasma screen flux decay quickly, generally run around one and a
half years time, just need to change, but the LED display screen under
the same operating conditions for at least five years no problem.
Brush
3, LED screen machine can use interactive technology, strengthen the
brush screen machine as advertising media and audience interaction, such
as cloud technologies to implement custom touch screen, broadcast
control management, etc.
4,
in terms of displays, LED display, high brightness, wide viewing Angle,
and good color reproduction ability is better than that of the LCD
screen.LED
brush screen machine is generally used in airports, shopping malls,
hotels, high-speed railway, subway, cinema, exhibition, office, etc.,
the target customer consumption ability is strong, has the huge
advertising value.
LED screen brightness judging method resolution
A, how to identify the brightness of the LED display
1, make myself a 3 v dc power supply for easy connection leds, had better use battery production.Can
use two button batteries, installed in a small plastic tube and lead to
two probes as output is negative, the end made a switch shrapnel
directly, when used, plus or minus probe corresponding contact
light-emitting diodes (leds) plus or minus pin, hold down the end of the
switch, light electric light tube.
2,
secondly, using photosensitive resistance and digital multimeter,
simple metering device, the photosensitive resistance leads to the two
thin wires, directly connected to the digital multimeter, on two pens
and a multimeter gear in 20 k position (depending on the photosensitive
resistance, make precise readings), note that the measured value is the
actual value of photosensitive resistance, therefore, the brighter the
light, the smaller the numerical value.
3,
in a LED light-emitting diode, with more than 3 v dc lights, light head
are connecting to and close to live good photoconductive resistance
photosensitive surface, at this point, the multimeter reading, in order
to distinguish the luminous intensity of LED.
Second,
the brightness identification level, refers to the human eye can
distinguish between the image from the black to the white brightness
level.
LED display the grey scale of some high, can achieve grades 256 and 1024.But because the human eye sensitivity to the brightness is limited, and cannot fully identify the grey scale.That is to say, may be a lot of adjacent levels of gray eyes look identical.And eyes resolution per each are not identical.For
display, the level of human recognition nature is the more the better,
because the display image is, after all, give a person look.The
brightness of the human eye can distinguish level, the more means that
the display of color space, the greater the show colorful potential.Brightness identify class can use special software to test, general display can reach more than 20 level even better grades.
Three, brightness and the visual Angle of requirements:
Indoor
full color LED display brightness to above 800 CD/m2, outdoor full
color brightness is more than 1500 CD/m2, to guarantee the normal work
of the screen, otherwise it will because the brightness is too low and
can't see shown in the image.Mainly by the size of the brightness of LED tube core is good or bad decision.Viewing angles directly depends on the size of the LED display how many of the audience, and the bigger the better.Perspective is mainly determined by the tube core is encapsulated.
Is
necessary to determine the brightness of the LED display, LED display
of the current designs city-lighting brightness requirements, or new
rules, the brightness of the LED screen is too high, will cause trouble
to the nearby residents.In
order to avoid the adverse reaction, which requires businesses in
custom and maintenance of LED display need to have relevant professional
knowledge.
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Created on Dec 31st 1969 18:00. Viewed 0 times.