Is OLED a trend? In many ways, the LCD screen is even better.

- Oct 15, 2018-

Recently, most of the attention of the entire mobile display market has been placed on OLED technology, especially Samsung has left us the most impressive impression. LG has also begun to invest heavily in mobile OLED component production lines and new factories, hoping to catch up with Samsung's footsteps. Speaking of this, many people seem to think that at least in the high-end smartphone market, OLED screens have become the future direction, while the traditional LCD screen will slowly launch the historical stage.

While looking at the expectations of the entire OLED panel shipments, we can see that the future will continue to increase, but this does not mean that the demand for LCD panels will decline accordingly. Of course, LCD actually has its own advantages and technical natural attributes, indicating that LCD is not outdated, and even better than OLED in some aspects.

High resolution problem

Few people now complain about the screen effects of today's high-end smartphones. Since everyone has generally upgraded to QHD resolution, coupled with the blessing of HDR technology, there is basically no smartphone screen that is not working well. Another big concern is the brightness of the display.

The problem is that neither the LCD nor the OLED screen panel provides 100% effective brightness output, and some of the light can be blocked by other display components or have lost problems. In the LCD screen, the backlight must pass through the filter, and the efficiency of the filter is not high, and each pixel control transistor also takes up a certain amount of space, so these have become blocking each pixel. The hindrance of light. Different backlight technologies, such as a-Si or LPTS, can change the aperture of the pixel. Of course, when panel makers increase resolution, more light is masked by these fixed-size transistors.

On the other hand, OLED screens do not solve this problem very well. Although the form of light loss is different, each pixel still needs a complex transistor layer, and this layer is hidden in the light-emitting portion of the OLED panel. Even so, the tightly packed TFTs result in resistive and capacitive energy losses, meaning that at higher resolutions, more energy is needed to drive the same brightness. A reflective polarizer is also required, and this method is not completely effective because it causes a slight loss of light.

Therefore, the higher the resolution of the display, the greater the energy required to drive the LED backlight of the display, in order to achieve better visibility in the sun, while the display consumes more power. The addition of HDR technology further exacerbates this problem, because the practice of making black blacker and whiter brighter increases the dynamic range, but it also directly consumes additional power. Obviously, too much power consumption will directly affect the user experience, but it is still possible to solve this problem through some technological innovations.