Let the tail go to hell! LCD TV MEMC compensation technology


Today, talk to everyone about LCD TV's MEMC compensation Dafa! When we watch movies on TV, we often find motion pictures. For example, when the lens is moving left or right or moving up and down, the object will feel a slight sensation during the movement. The faster the picture moves, the stronger the sense of sensation and the sense of jitter. In addition, we found that the size of the screen feels different, and the larger the screen, the more noticeable the feeling becomes. What is the reason for this? go down!


First of all, why produce fuzzy jitter? This matter also began with ancient movie standards. Ancient movies were still film years at that time. In order to meet human eye reaction time and shooting costs (at the time the film was very expensive), the ancients set the display frame rate (the number of films displayed per second) to The lowest 24Hz.

However, in the TV era, because the TV is self-illuminated and it is displayed in a pixel scan mode, a black screen is actually inserted between the two screens as blanking. We call this the field blanking. Expand; So when we watch TV in time series, the television display order is: an effective picture → black field → an effective picture → black field, so go.

In such a situation, if it is still displayed with 24 pictures per second, the human eye will see flickering. For this reason, the television display frequency is set at 50Hz (China TV) or 60Hz (US TV); and the corresponding broadcast television. The program is also set at this frequency. Therefore, for a film shot at 24Hz, it is necessary to display the frame at 50Hz.

Let's look at a few pictures, the trajectory of a football will basically understand;


The actual track of a football



Actual trajectory linear



Shooting image tracks with a 24Hz camera



Cinema Plays a Linear Motion Picture with a 24Hz Frame Rate



Play track on television



A trajectory line chart seen on television

From the above figure we can see that the difference between the actual trajectory and the trajectory seen on the final TV is relatively large. It's easier to see how we stack up the two figures.


Comparison of actual trajectory and broadcast trajectory



Actual picture situation

From the above figure we can see that during the flight of football, we will see the bad phenomenon of shaking, ghosting and blurring.

Second, how to solve fuzzy jitter? The R&D staff working on TV terminals came up with a big move: motion estimation, motion compensation. The so-called motion estimation, motion compensation: through the estimation of the object's movement trajectory, in order to insert the frame to move the place where the object to go up, rather than a simple two-frame repetition, in this way the smoother and clearer moving image processing Better. The following figure shows the difference between motion compensation and no motion compensation:


Motion compensation whether there is contrast

From the above figure, we can see whether there is a difference in motion compensation, there is no motion compensation effect blur, ghosting, jitter. On the contrary, motion compensation is smooth and clear.

The biggest advantage of motion compensation is that it effectively protects people's eye health. According to the survey, when watching TV, if the image is blurred, the human eye will constantly adjust the focus, prone to fatigue, and long-term visual impact. In addition, the motion picture shake will affect the viewing experience, people with sensitive motor nerves will feel uncomfortable, and they will feel dizzy even if they have a long time.

In summary, motion compensation technology is a very useful, very pull the wind technology, to solve the top technology of signal diversity and television display technology matching is indispensable. When you buy TVs, do not blindly look at the prices and plans. You should consider whether or not you have televisions with motion compensation and be responsible for the health of yourself and your family.

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