In the TV settings, you can see the mention of Flickerless. For example, in Samsung, this setting is available in the service (secret menu), has two modes enabled and disabled. Many have asked what this setting is and what it does.
How Flickerless works
Why flickering is used in TVs, a little about technology. Flickering is only used in LCD screens. This is due to the fact that the LCD screen consists of pixels, pixels are polarized crystals that rotate in the cells and let the light flow from the backlight. Pixels transmit from 100% of the light output or can trap light, reducing the light output to almost 0%.
But as you can imagine, the pixel takes time to rotate in the cell, and an afterimage remains on the screen. Note that in modern TVs, the time required for a pixel to turn is extremely short and is about 5-20 milliseconds. But when displaying a fast-moving image, a trail of afterimage may appear, which makes the picture a little blurry. The easiest way to see it, right now, quickly move the mouse cursor on the screen from side to side. You will see several cursor images with different intensities, this is the afterimage effect.
To remove the trail (afterimage), manufacturers have come up with a technology to insert a black frame between normal frames. But how to create a very fast black frame, it is clear that it is impossible to do this including pixels. A black frame is created by turning off the screen backlight. This is also called strobe backlighting or PWM Dimming Frequency. Oftentimes, depending on the class of the TV, backlight shutdown trips can vary from 60 to 960 times per second. Inserting a black frame reduces the human perception of the afterimage.
Disadvantages and advantages of Flickerless, flicker-free
The screen is not visually backlit for some time; a person notices image blur less. But some people, especially if the TV is operating with the lowest possible backlight cut-off frequency of 60Hz, may notice screen flickering. Also, when inserting a black frame, the brightness of the image is reduced by 5-10%. For more detailed settings, you can control the flicker-free mode.
Flickerless On or Off
If you notice flickering in the image, try turning on Flickerless mode. If you enable this mode, the backlight blinking will be disabled. Perhaps the image quality will be of acceptable quality for you and will suit you completely when watching TV programs.
Is it safe to turn this option ON in service menu on Qe49Q70R QLED 60Hz panel TV?
Is it safe to turn this option on on qled 49 inch 60 Hz panel ?
Yes., No Issue