From The LCD To The OLED, The Satirical Dynasty Replacement

- Dec 26, 2018-

After defeating CRT, LCD technology has become the undisputed king of the display field for nearly 20 years. In October 2013, Panasonic announced that the plasma TV was discontinued at the end of March 2014. One era officially ended, and the historical mission of challenging LCD was taken over by OLED.


From the LCD to the OLED, the satirical dynasty replaced


Ironically, the planar LCD technology replaced the curved CRT cathode ray tube 20 years ago; 20 years later, the LCD is also a curved surface technology - OLED (Organic Light Emitting Diode).


At the CES show in early 2013, the world's first curved OLED TV was launched by LG. What's more ironic is that, just like the manufacturers in order to let the CRT continue, "imitation" flat-panel LCD launched a flat CRT display, in order to cope with the fascinating OLED, Sony launched the world's first curved LED TV in the same year.


Technology is cruel, LCD LCDs have beaten CRT, but LCDs will sooner or later be replaced by other technologies. But before being replaced, manufacturers will continue to introduce transition products for the original LCD production line. The reason for pushing the LCD to the forefront is to attempt to seize the curved LCD TV that originally belonged to the OLED market.




OLED TV structure


Dong Shi effect, why ordinary LCD should not be made into a curved surface?


The curved surface display can be exchanged for a relatively larger user's field of view, enhance the sense of presence, and the curved TV has a more shocking appearance. Therefore, it is convenient to make a curved OLED, and it has been designed as a curved OLED TV by LG. But the same thing is put on the LCD is completely effective.




The imaging principle and structure of LCD liquid crystal are relatively complicated. It controls the liquid crystal molecules to rotate by voltage, thereby blocking the backlight to control the color depth (grayscale brightness), and then allowing the different sub-pixels to display the three primary colors through the polarizing plate and the filter, so that the color and the depth controllable sub-pixel points can be obtained. Different images are displayed through the pixel array.


The TN, IPS, MVA, and PVA panels that everyone usually listen to are TFT-driven LCD monitors. The difference is mainly the arrangement of liquid crystal molecules. In the actual structure, the key liquid crystal molecules are sandwiched between two glasses and driven by a voltage applied by a TFT (Thin Film Transistor).


For each sub-pixel point, the liquid crystal is responsible for controlling the gray scale, and the three primary color filters control the color, and they must be in one-to-one correspondence to display the correct color. If the LCD liquid crystal panel is bent, the inner circumference will be smaller than the outer circumference, and the original one-to-one corresponding liquid crystal and the filter will have a positional deviation, resulting in color variation distortion. Other side effects include light leakage, dark shadow ghosting, and snowflake.