Custom Display Screen.LCD and OLED screen. With the continuous development of science and technology, consumers’ demand for screens is also changing.

From TV screens to mobile phone screens, manufacturers not only improve the performance of digital home appliances, but also pack them on the screen to make consumers feel the changes and upgrades of their products.

At present, in the flat panel TV and smartphone technology camp, LCD and OLED are relatively common display technologies in the market, and each display technology occupies a certain market share in their market. Before we understand the difference between LCD and OLED, let’s take a look at their respective fundamentals.

The imaging principle of LCD is that the liquid crystal is placed between two pieces of conductive glass, driven by the electric field between the two electrodes, causing the liquid crystal molecules to twist the nematic electric field effect, in order to control the light source transmission or shielding function, produce light and shade between the power supply and display the image, if the color filter is added, the color image can be displayed.

OLED, or organic light-emitting diode display, is composed of a layer of light-emitting materials embedded between two electrodes. When the voltage is input, the carrier moves through the organic layer until the electron hole is recombined to achieve energy conservation and release the excess energy in the form of light pulses. At this point, one of the electrodes is transparent and the light emitted can be seen. It is usually composed of indium tin oxide (ITO).

If OLED is divided by driving mode, it can be divided into PMOLED (passive driving) and AMOLED (active driving). AMOLED originated from Samsung, each pixel is equipped with a switch TFT (thin film transistor), its drive mode is easier to achieve high brightness, high resolution, high color performance, low energy consumption, this kind of panel is widely used in consumer electronics products.

PMOLED originates from LG, its structure is simple, the manufacturing process is easy, can effectively reduce the manufacturing cost, fast response, and has great potential in the display of simple micro devices. However, PMOLED will have the problems of high power consumption and reduced life, and the product size is limited to about 5 inches.

LCD and OLED screens have their own advantages and disadvantages, and the differences between them are mainly shown in the following seven aspects.

Ordinary LCD TV will have delay (residual shadow), this is because the response speed can not keep up, when watching sports events or playing games, the picture will be significantly different. Generally speaking, the response time of LCD is 10ms, while OLED can do 0.001ms. No matter watching movies with OLED TV or OLED mobile phone, there will be no residual shadow, and it can also achieve better sound and picture synchronization, and consumers will have a better sense of experience when watching movies or playing games.

The liquid crystal layer cannot be completely closed, and when the LCD panel shows black, some light will pass through the color layer. The black that users see through the LCD screen is actually a mixture of white and black gray, like a white flashlight shining on a black film, and the black you see from the other side of the film is actually gray with a sharp decline in brightness, not pure black. Unlike OLED, the OLED screen has a higher contrast. When showing black, you can directly turn off the pixels in the black area, achieving an almost pure black effect.

The biggest problem with the LCD panel screen is light leakage, which is caused by the use of backlight units. The OLED is a self-luminous characteristic, it is each pixel as an independent light source, which needs to be lit to the limit of which pixel, so there is almost no light leakage on the OLED screen.

OLED screens have a wider visual angle than LCD screens. Take the TV as an example, no matter where you sit and watch OLED TV, the experience of watching TV is the same, while LCD TV, sometimes sitting on the side to watch will affect the viewing effect.

Due to the existence of backlight layer and liquid crystal layer, LCD screen is thicker than OLED screen. In addition, the “light” and “thin” nature of the OLED makes a curved screen possible. Because OLED is an organic material, its aging rate is much faster than LCD, there will be phenomena such as screen burning, and its life is shorter.

The author has consulted people in the industry to understand that the residual shadow or burning screen in OLED is due to the lack of blue life, and the blue attenuation will lead to changes in the white picture of OLED TV. After consumers buy an OLED TV, they will find that the white picture is getting more and more yellow every month, because its blue light is getting weaker and weaker.

At present, LCD has developed very mature, and the manufacturing cost of products has been reduced year by year. OLED display technology is still in the stage of development, the manufacturing process is complex, the manufacturing maturity is still climbing, and the manufacturing cost is high. When I discussed the OLED screen with people in the industry, I learned that the manufacturing cost of OLED is at least 2 times more expensive than that of LCD panels. At present, LCD panels have been widely used in display devices, while OLED screens are mostly used in products such as high-end televisions or flagship mobile phones, and the price is much more expensive than LCD products.

OLED and LCD screens can be used on devices such as mobile phones, televisions, notebooks and monitors. Which of these two panels is more eye-protecting for consumers? In order to make it easier for users to understand, the author takes Blu-ray and splash screen problems as examples to see who is more eye-protecting.

In fact, both LCD and OLED screens emit blue light. Because the OLED screen is self-luminous, it is more harmful to the eyes in dim light, while the display effect of LCD in dim light is better, and the damage to the eyes is relatively less.

Strobe, because OLED often uses PWM dimming to quickly switch the screen light source for dimming, although the human eye is not aware of, but in slow motion, its screen is flickering at a fixed frequency, low frequency is particularly harmful. The splash screen will have an obvious irritation to the user’s eyes, coupled with the high contrast of the OLED screen, for the “stay up party” (OLED mobile phone users), the OLED screen has a great impact on eyesight.