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  • CeBIT : THE LCD news
  • CeBIT : Samsung LCD, MPA technology
  • CeBIT : AU Optronics / BenQ : BFI technology
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     CeBIT : THE LCD news
      Posted on 09/03/2006 at 14:26 by Vincent
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    Jointly, but with radically different technologies, AU Optronics and Samsung celebrate the end of the "response time". The new P-MVA and S-PVA panels would be, according to the manufacturers, faster than the most recent TN 1 or 2ms and despite a slower official (understand "measure") response time.

    They both have a common objective: to have the same reaction time as CRT. If highly sophisticated machines measure very low response time there is still some afterglow effect on TFT monitors. There is a second problem that we very regularly noted during the past five years. It isn't because a monitor is faster than another between greys or from white to black that it will indeed have a faster reaction time in games. After two years, the reign of response time measure between greys is over. G2G Samsung and AU Optronics agreed that it was time for another model. This one doesn't fit anymore. It no longer reflects the reality and is particularly unsuited to their new technologies.

    They two have tried to get back to how CRT worked and adapt it to LCD. Samsung went for the image frequency and AU Optronics took it inspiration from CRT scanning not to adjust the monitor afterglow effect but the one generated by our eyes.

    Here is a presentation of each of the technologies in the two following news:

     CeBIT : Samsung LCD, MPA technology
      Posted on 09/03/2006 at 14:22 by Vincent
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    Samsung has oriented their research on the image rate. It is of 60 fps (60 Hz refreshing rate) for TFT as compared to 85 to 120 fps for CRT. The afterglow mainly comes, according to them, from this gap. The MPA technology introduced in future PVA monitors series (TN aren't concerned for now) consist in intercalating one image between two to artificially double the image rate and to reach 120 images per second. Each image added isn't the same as the previous one or the next one but an image calculated, interpolated, and intermediate.

    To demonstrate the efficiency of this system, Samsung opposes in their stand the current 24" S-PVA monitor to a 24" monitor based on the next generation. The two are in clone mode and display a video showing a motorcycle moving from the left of the monitor to the right. The result is amazing. One shows a very strong afterglow and the other one don't.

    If this demonstration is impressive, we have to put in into perspective. The reference monitor, the slow one, is already slow today compared to the fastest monitors. The current Samsung 24" monitors are 8 to 16 ms PVA and are much slower than the Acer which is also a PVA but 6ms. It includes a much more recent panel and electronic generation. In clone mode, the result of the Acer and the slow Samsung would already be impressive. We will have to test this technology to really appreciate its efficiency. It is best however not be in a rush: Samsung is at this date unable to tell us when it will be released. We don't even know if these monitors will be available in 2006…Samsung is persuaded of the efficiency of this process. It is true it is really promising. The only thing that bothers them is that no measure would reflect the actual reaction time of their monitor. Especially not the response time, because it would be much higher than TN despite the fact that the actual rendering would be faster for the new PVA. So this is the reason why they might not give this characteristic for the next monitors of this type. We aren't mad at them for that: it has already been a long time since we noticed its lack of representativeness.

    We however have to point out that we find the "MPA" name particularly unsuited. Unless if you keep a close look to LCD current events, you might get yourself lost between MVA panels that became P-MVA for AU Optronics, PVA that became S-PVA for Samsung. And now to complicate the situation, they add a MPA technology….

     CeBIT : AU Optronics / BenQ : BFI technology
      Posted on 09/03/2006 at 14:20 by Vincent
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    AU Optronics' approach is much different. CRT monitors images are drawn by a ray that scans the monitor. Each dot is illuminated during a very short amount of time. For a CRT monitor at 85 Hz each pixel is only illuminated during 12ms approximately before being in the dark for the rest of the time. In facts the dots keeps the brightness because of the panel phosphorus persistence. This brightness nevertheless declines in time and sometime reach zero before that the ray draws the next dot. This variation has two consequences: the CRT brightness is much more moderated that the LCD and it cleans our eye that is naturally subject to image persistence.

    Even for the current fastest LCDs, images displayed are complete and without transition between each of them. Even if the crystals are very fast, our eye keeps the previous image in memory. In consequence it adds an afterglow that the monitor doesn't actually produces. This point, added to other factors, disturbs response time measures. This is the reason why they are so less representative of the monitor real reaction time.

    To clean our eyes, AU Optronics imagined the introduction of black images. The FP241W displays one black image every six images. They name this "technology" BFI.

    Like for Samsung, BenQ made a demonstration of this new generation of monitors and opposed it to current products on the market. They showed in clone mode the next FP241W with BFI compared to their current 23". The progress is even more striking than for Samsung. The 24" seems to have a reaction time comparable to plasma monitors.

    Just like for Samsung, we have to put this excellent result in perspective. The demonstration is made to be impressed by the result of the new technology compared to the poor quality of the 23" monitor. We have point out that we already tested this 16 ms IPS monitor and nailed it for the low games and videos quality. Here again we will have to test it to evaluate the real or supposed efficiency of the BFI. Fortunately we will have to wait less than for Samsung: the FP241W would be released in June. Nevertheless I have to say that this monitor made a really good impression on me. I have the feeling that I have never seen such a reaction time on a LCD. BenQ's technical responsible that welcomed me are categorical: this monitor is better than the fasted TN! I would be inclined to believe them.

    After the come back of the IPS a few weeks ago, we are once more the witness of a major change: Samsung and AU Optronics, the two most active actors for TN and VA panels change their point of view. According to them, gamers will be in the futures seduced by VA panels. TN technology could be restricted soon only to entry level monitors.

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