LCD display principle
Author:pipi Time:2021-07-22 08:02 Browse(313)
In recent years, LCD display has gradually accelerated the pace of replacing CRT display. Do you plan to buy an LCD? Do you know LCD? What is the difference between liquid crystal display and traditional CRT display in the technical principle of light emission? The traditional CRT display mainly relies on the electron beam emitted by the electron gun in the picture tube to shoot the phosphor inside the display screen to emit light. Under the intentional interference of the artificial magnetic field inside the display screen, the electron beam will deflect at a certain angle and scan the phosphor in the target cell to display different colors. However, TFT-LCD adopts the principle of "backlight" and uses the lamp as the backlight/
In recent years, LCD display has gradually accelerated the pace of replacing CRT display. Do you plan to buy an LCD? Do you know LCD? What is the difference between liquid crystal display and traditional CRT display in the technical principle of light emission? The traditional CRT display mainly relies on the electron beam emitted by the electron gun in the picture tube to shoot the phosphor inside the display to emit light. Under the intentional interference of the artificial magnetic field inside the display, the electron beam will deflect at a certain angle, Different colors are displayed by scanning the phosphor of the target cell.

LCD display principle

however, TFT-LCD adopts the "backlight" principle.
the lamp is used as the backlight, Through the auxiliary optical module and liquid crystal layer to control the light to achieve a more ideal display effect.
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liquid crystal is a regular arrangement of organic compounds.
it is a substance between solid and liquid, At present, nematic thin columnar liquid crystal, which is most suitable for manufacturing liquid crystal displays, is generally used.
liquid crystal itself can not generate light.
it mainly displays images by changing the arrangement of liquid crystal molecules due to the electric field generated by the change of voltage.
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the liquid crystal panel is mainly composed of two sodium free glass sandwiched by a polarizing plate and a polarizing plate The liquid crystal layer is composed of a layer composed of a liquid crystal layer and a color light filter.
the polarizing plate and a color filter determine how much light can pass through and what color light can be generated.
the liquid crystal is poured between two well-made planes to form a liquid crystal layer.
there are many grooves on the two planes, and the grooves on the separate planes are parallel, However, the grooves on the two parallel planes are perpendicular to each other.
in short, if the grooves on the back plane are arranged vertically.
then the front plane is arranged horizontally.
in this case, the grooves on the back plane are arranged verticallyThe arrangement of liquid crystal molecules between the two planes will form a 90 degree zigzag state.
backlight light source means that the light emitted by the lamp passes through the backlight plate and reflective film on the back of the LCD screen.
uniform backlight light is generated, and the light will be twisted along the Z-axis by the liquid crystal through the back layer, Thus, it can pass through the front layer plane.
if the voltage is applied to the liquid crystal layer, an electric field will be generated.
the liquid crystal molecules will rearrange, and the light can not be twisted, so that it can not pass through the front layer plane, so as to block the light.
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the disadvantages of liquid crystal display are brightness, uniformity of drawing surface, light intensity However, the brightness of LCD mainly depends on the backlight.
of course.
the design of the whole module is also a factor that affects the brightness of the product.
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No In fact,
"lumen" is a unit of luminous flux, The unit of brightness should be CD / m2 (superscript).
both are technical parameters used in the field of optics.
the sum of the amount of light emitted per unit time is called luminous flux.
in physics, it is a symbol.
the luminous flux per unit solid angle per unit area in a specific direction is called luminace.
in physics, it is expressed as L, The unit is candela per square meter, or candela per square meter, CD / m2.
brightness is an important indicator to measure the luminous intensity of a displayFor liquid crystal displays, Especially important.
high brightness also means that the display has higher anti-interference ability for its working environment.
the TCO'03 certification standard mainly for liquid crystal displays has also made quite high requirements.
manufacturers also take high brightness as one of the selling points of their products.
generally speaking.
manufacturers mainly increase the number of lamps and optimize the internal quality of the display From this, we can see that the performance of LCD has a great relationship with panel materials, and the quality of panel will directly determine the performance of LCD.
on the market.
the panels used in 12ms, 16ms and 25ms LCD displays are different.
however,
a good panel also means a higher price Samsung, LG and other manufacturers have high-quality panels with high prices.
Taiwan manufacturers also have Youda and other well-known manufacturers.
their products are cost-effective, and many monitors in the market use their products.
the pure world ezx15f2 is one of them.
its brightness is 400cd / M2.
the contrast reaches 550:1; The general similar products only have 250cd / m2 brightness and 300:1 contrast.
and the corresponding time is only 16ms.
they are fully competent for all kinds of applications.
their viewing angle has reached 163 degrees horizontally / 135 degrees vertically.
they are also superior to other brands of LCD displays with the same price.
the color panel materials.
extraordinary technical parameters, high-quality performance, what are you waiting for
it seems that the liquid gives off different colors of light under different voltages
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