What are led dot matrix display and LCD display? What's the difference between them?
Author:Luo Ying Time:2021-07-21 08:52 Browse(327)
LED display (LED)
LED panel: LED is the abbreviation of light emitting diode, short for LED.
it is a display mode by controlling semiconductor LED.

What are led dot matrix display and LCD display? What's the difference between them?

it is used to display text, graphics, images, animation, market, video, etc The display screen of video signals and other information.
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the LED display screen is divided into graphic display screen and video display screen.
both are composed of LED matrix blocks.
the graphic display screen can display Chinese characters, English texts and graphics synchronously with the computer; The video display screen is controlled by microcomputer.
it can display all kinds of information in a real-time, synchronous and clear way of information transmission. It can also display two-dimensional and three-dimensional animation, video, TV, VCD programs and live scenes.
the LED display screen shows bright colors.
it has a strong sense of three-dimensional, static as oil painting and dynamic as film. It is widely used in stations, docks, airports and other areas Shopping malls, hospitals, hotels, banks, securities markets, construction markets, auction houses, industrial enterprise management and other public places.
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it has the advantages of high brightness, low working voltage, low power consumption, miniaturization, easy matching with integrated circuits, simple driving, long service life, shock resistance, low power consumption, low cost, low cost, low cost and low cost Stable performance.
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liquid crystal display (LCD) is called liquid crystal display in English.
it is a kind of display that uses liquid crystal to control light transmittance technology to realize color.
compared with CRT display,
LCD has obvious advantages.
because light and dark can be controlled by controlling light transmittance.
when the color remains unchanged, the liquid crystal remains unchanged, In this way, there is no need to consider the refresh rateFor the LCD with stable picture and no flicker sense,
the refresh rate is not high, but the image is also very stable.
the LCD also uses the liquid crystal to control the light transmittance to make the bottom board glow as a whole.
therefore, it achieves the true full plane.
some high-end digital LCD displays use the digital mode to transmit data The image is displayed.
in this way, there will be no color deviation or loss caused by the graphics card.
there is no advantage of radiation at all.
even if you watch the LCD screen for a long time, it will not cause great damage to your eyes.
it is small in size and easy to use The low power consumption of a 15 inch LCD is one third of that of a 17 inch flat CRT.
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at present, compared with CRT, the image quality of LCD is still not perfect.
the color performance and saturation of LCD display are different to CRT display.
moreover, the response time of LCD display is also improved It's longer than CRT, and it's OK when the picture is still. Once it's used to play games and watch videos, the weakness of LCD will be exposed, and the picture delay will cause ghosting and tail shedding, The working principle of LCD display is as follows:
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from the structure of LCD display.
whether it is laptop or desktop system, the LCD display is a layered structure composed of different parts.
LCD is composed of two glass plates.
the thickness is about 1 mm, in which there are 5 glass plates containing liquid crystal materials μ Because the liquid crystal material itself does not emit light.
there are light tubes on both sides of the display screen as light sources,On the back of the LCD, there is a backlight plate (or uniform light plate) and a reflective film. The backlight plate is composed of fluorescent materials and can emit light, Its main function is to provide a uniform background light source.
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the light emitted by the backlight enters the liquid crystal layer containing thousands of liquid crystal droplets after passing through the first layer of polarization filter layer.
the liquid crystal droplets in the liquid crystal layer are contained in a small cell structure.
one or more cells constitute a pixel on the screen.
there is transparent electricity between the glass plate and the liquid crystal material The electrodes are divided into rows and columns. At the intersection of rows and columns, the optical rotation state of liquid crystal is changed by changing the voltage. The liquid crystal material acts like a small light valve.
around the liquid crystal material are the control circuit and the driving circuit.
when the electrode in the LCD generates an electric field.
the liquid crystal molecules will be distorted, The light passing through it is refracted regularly, and then filtered by the second layer of filter layer and displayed on the screen.
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there are also weaknesses and technical bottlenecks in liquid crystal display technology.
compared with CRT display, the brightness, picture uniformity, image quality and so on There is an obvious gap between the viewing angle and the reaction time.
the reaction time and the viewing angle depend on the quality of the LCD panel.
the uniformity of the picture has a great relationship with the auxiliary optical module.
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for the LCD, the brightness is often related to its back light source.
the brighter the back light source is.
the brightness of the whole LCD will also be improved.
and In the early stage of LCD,
because only two cold light source lamps were used, the brightness was often uneven and the brightness was not satisfactory.
until the launch of four cold light source lamps.
in the early stage of LCD, only two cold light source lamps were used
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the signal response time is the response delay of the liquid crystal unit of the liquid crystal display.
in fact, it refers to the time required for the liquid crystal unit to change from one molecular arrangement state to another.
the smaller the response time, the better. It reflects the speed of the response of each pixel of the liquid crystal display to the input signal, The smaller the response time is, the user will not feel the tail dragging when looking at the moving picture.
some manufacturers will reduce the concentration of conductive ions in the liquid crystal to achieve the rapid response of the signal.
however, the color saturation, brightness and contrast will be reduced accordingly, However, the display effect of LCD is sacrificed.
some manufacturers add an IC image output control chip to the display circuit.
the IC chip can process the display signal specially.
the IC chip can adjust the signal response time according to the VGA output signal frequency.
the IC chip can adjust the signal response time according to the VGA output signal frequency Because the physical properties of the liquid crystal are not changed.
therefore, the brightness, contrast and color saturation of the liquid crystal are not affected, and the manufacturing cost of this method is relatively high.
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it can be seen from the above.
the quality of the liquid crystal panel can not fully represent the quality of the liquid crystal display, and there is no excellent display circuit, No matter how good the panel is, it can't make LCD with excellent performance.
with the increase of LCD production and the decrease of cost.
LCD will be widely used.
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LCD will be widely used
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