1. LED and LCD
Simply put, LCD and LED are two different display technologies, LCD is a display screen composed of liquid crystals, and LED is a display screen composed of light emitting diodes.
LCD (Liquid Crystal Display) liquid crystal display, there are several types of TFT, UFB, TFD, STN, etc., the commonly used notebook LCD screen is TFT.
TFT (Thin Film Transistor) thin film transistor, each liquid crystal pixel is driven by a thin film transistor integrated behind the pixel, so that it can display information on the screen at high speed, high brightness and high contrast. It is the best LCD at present. One of the color display devices is the mainstream display device on notebook computers and desktop computers.
Compared with STN, TFT has excellent color saturation, reduction ability and higher contrast. It is still very clear under the sun, but the disadvantage is that it consumes more power and the cost is higher.
LED (Light Emitting Diode) light-emitting diodes, LED applications are divided into two categories: one is LED display; the second is LED single tube application, including backlight LED, infrared LED, etc. Now China's LED display design and production technology level Basically synchronized with international.
The LED display is composed of light-emitting diode arrays. It uses low-voltage scanning drive and has the characteristics of low power consumption, long service life, low cost, high brightness, few failures, large viewing angles, and long viewing distance.
The LED on the left, the LCD on the right, the LCD screen looks bluish and the color is relatively light.
The difference between
LED and LCD LED display compared with LCD display, LED has more advantages in brightness, power consumption, viewing angle and refresh rate. Using LED technology, a thinner, brighter and clearer display can be manufactured than LCD.
- LED to LCD power consumption ratio is about 1:10, LED is more energy-efficient
- The viewing angle provided by the LED is up to 160 °, and can display various text, color images and animation information
- The single element reaction speed of LED is 1000 times that of LCD liquid crystal screen, it can be seen correctly under strong light, and it adapts to the low temperature of minus 40 degrees
2 、 LED 和 OLED
LED screens and OLED screens are essentially different in the principle of light emission.
The LED emits light by controlling the display mode of the semiconductor light emitting diode, which is usually composed of a plurality of red light emitting diodes, and the display is dominated by the lighting of the lamp, and the manufacturing cost is relatively high. In addition, LEDs can only be applied in the form of point light sources.
OLED (Organic Light-Emitting Diode) organic light-emitting diode, does not need a backlight, it drives the organic film itself by current to emit light, so the structure is more thin and light. OLED is a surface light source technology, which can emit red, green, blue, white and other monochromatic lights, and then achieve the effect of full color, which belongs to a brand-new light-emitting principle.
The reason why the image quality of plasma technology, OLED technology and even CRT technology in the early years was praised is mainly because they all have the characteristics of "self-luminous".
Pros and cons
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Contrast, the LED screen cannot be controlled for each pixel. When displaying black, it mainly depends on the deflection of the liquid crystal molecules to shield the backlight. Therefore, there will be some light leakage when the liquid crystal panel displays the black screen, so the ultimate black screen cannot be obtained. Turn off the individual pixels and let their brightness return to zero. In theory, the contrast of OLED technology can be infinite
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Screen structure, OLED can be as thin as paper, with flexible and bendable characteristics. Compared with the LED screen with a complicated structure, the OLED display technology does not need the support of the backlight, so the liquid crystal and the backlight module are omitted. The structure is very simple, and the body can also be extremely ultra-thin. 1/3 thickness. The future OLED TV is expected to achieve a thickness of less than 1mm, which is beyond the reach of LED.
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Response speed, LED screen working mode will produce afterimages. The response time of the screen usually refers to the speed at which each pixel responds to the input signal, that is, the time required for the pixel to change from dark to bright or from bright to dark. The shorter the time, the faster the screen response time, the less likely to cause smear.
The response speed of OLED is much better than that of LED, and the afterimage phenomenon is basically invisible to the naked eye. OLED has a relatively large advantage in expressing high-speed dynamic images. -
The damage to the human eye, because the OLED is self-luminous, the wavelength is closer to natural light, and the damage to the human eye is less. The LED screen will inevitably produce blue light damage to the eyes.
3 、 OLED 和 AMOLED
OLEDs can be divided into AMOLED (Active Matrix Organic Light Emitting Diode) and PMOLED (Passive Matrix, passive matrix) according to different driving methods.
AM relative to PM refers to the driving method of each OLED pixel. In PM, the control of each pixel is realized through an electrode network, so as to realize the charging and discharging of a certain pixel. In general, the control method of PM is relatively slow, and the control accuracy is also slightly lower.
On the other hand, AM is equipped with a TFT and a capacitor layer on each LED pixel, so that when a row and a column are energized to activate the intersecting pixel, the capacitor layer in the pixel can maintain the charge state between two refreshes. Thereby achieving faster and more accurate pixel emission control.
The main difference
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AMOLED belongs to OLED, and vice versa is not established. Simply put, OLED includes PMOLED and AMOLED. PMOLED does not require a TFT backplane, but the size cannot be very large, and the size of AMOLED can be very large. PMOLED mainly existed on the early dual-screen mobile phones, used for small external screens
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OLED organic light emitting diode, its light emitting material is organic light emitting material. OLED will emit light as long as the correct voltage is applied to the positive and negative electrodes. AMOLED is an active organic light-emitting diode. It not only needs to add a signal to work, but also needs to supply a point source to make the diode reach the working state. At this time, it will give a bright or unlit signal before it will light or turn off.
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From the structural point of view, OLED is basically a diode, AMOLED is a triode or multiple transistors to drive a light-emitting point
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The so-called OLED is to coat a layer of organic material (very expensive) that can conduct light on the glass substrate of the screen, and then AMOLED is to add AM technology to the OLED panel to achieve active control.
Reference link:
https://www.cnblogs.com/jinanxiaolaohu/p/10652976.html
https://www.toutiao.com/a6757593104011755789/
