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Reviewed by Phil Hinton The HC3800 doesn’t pretend to be anything but an entry level DLP projector, yet in turns in an excellent performance in terms of picture quality and features. Black levels are acceptably good with plenty of shadow detail and image depth where required. It can achieve reference Greyscale and Gamma results when professionally calibrated and it tries hard to produce colours correctly. I found my time spent with the HC3800 to be entertaining for all the right reasons and at the price point, this projector deserves to find quite a few new homes as I think its definitely a best buy at this level of the market.
i have problem with the projector Mitsubishi HC3800. It´s probably a hardware error. I found during the projection, that the color homogeneity, especially with white color, goes from right to left side by 35% down with brightnes, respectively goes to the pink color. Projection is ceiling. When projection is front, you can see brightness in the opposite side. Brightness artefact is stable, without moving.
I tried to solve problem by:
- Use of other sources (HDMI, VGA from 3 different computers)
- Use the white test pattern without source
- exchange HDMI cable (length 1.5m)
- Using 3 different points of projection (to eliminate the possibility of
colored reflections from objects in the interior)
- projection from short / long distance
- zoom moving (without moving of artefacts)
- projection to white wall / projection screen
- front projection and ceiling projection
- reset settings to default
- Turn off the automatic correction of video modes
- calibrated settings from this forum vs default settings
- Switching mode Cinema / Sport / user
- Switching of color temperature
- Change eco lamp mode - normal mode
- use of other sources of power supply
- check the clarity of front lens
Unfortunately, 35% of difference is really recognizable, specially when camera scrolling or viewing web site.
Do you met with this issue too?
Best regards
Pavel.
Quote:
Originally Posted by The News Bot
Reviewed by Phil Hinton
The HC3800 doesn’t pretend to be anything but an entry level DLP projector, yet in turns in an excellent performance in terms of picture quality and features. Black levels are acceptably good with plenty of shadow detail and image depth where required. It can achieve reference Greyscale and Gamma results when professionally calibrated and it tries hard to produce colours correctly. I found my time spent with the HC3800 to be entertaining for all the right reasons and at the price point, this projector deserves to find quite a few new homes as I think its definitely a best buy at this level of the market. Read the full review...
What you are describing is screen uniformity, the fact that screen brightness varies across the surface of the screen from one edge or corner to another. Every projector will have some issues with uniformity in some way, the majority will have errors of around 15%. Most are not noticable. Apart from the uniformity issues (brightness) you will also see colour shifts as described by a greyscale that is off, or in a worse case senario the panel (DMD or chip depending on projector) becomes discoloured due to heat issues - this is rare but possible.
However, there could be other issues. How long have you had the projector and how much use have you had out of it? As the lamp ages it is possible that the uniformity will change and become more noticable. In extreme cases where there is a lot of heat from extended use, you may even see some damage to the panel where it physically changes due to the heat inside the projector - again rare but possible (I have seen some LCD projectors in bars and hotels have completely burnt panels).
If you haven't had the unit very long then I would contact your dealer and ask them to investigate or try to fix the problem. It could be a number of issues like those above or even a handful more I haven't mentioned.
In terms of this review sample I didn't find any issues with uniformity of the image that were visible to the eye. It was a new unit that I put about 50 hours on during the review process. Hope that helps. For further advice and help, please use the projector forum.
Last edited by Phil Hinton; 21-12-2009 at 2:41 PM.
unfortunately, projector is new one. Only 2 hours in use. I never met with this issue by DLP projector that I bought (Benq MP720, Benq PE7700, Optoma HD65). Yes it´s possible, than difference of uniformity was maximum approax 10 % global by projectors, but 35 %? What do you think? Gave you a projector to claim? 35% is quite a difference.
Here is picture with reseting of lightness pixel to white RGB (255.255.255)
Difference view:
and with contrast frame
So, with contrast frame is best example, how person shows color difference in reality.
Thanks for your opinion,
Pavel.
Quote:
Originally Posted by Phil Hinton
Hi Pavel,
What you are describing is screen uniformity, the fact that screen brightness varies across the surface of the screen from one edge or corner to another. Every projector will have some issues with uniformity in some way, the majority will have errors of around 15%. Most are not noticable. Apart from the uniformity issues (brightness) you will also see colour shifts as described by a greyscale that is off, or in a worse case senario the panel (DMD or chip depending on projector) becomes discoloured due to heat issues - this is rare but possible.
However, there could be other issues. How long have you had the projector and how much use have you had out of it? As the lamp ages it is possible that the uniformity will change and become more noticable. In extreme cases where there is a lot of heat from extended use, you may even see some damage to the panel where it physically changes due to the heat inside the projector - again rare but possible (I have seen some LCD projectors in bars and hotels have completely burnt panels).
If you haven't had the unit very long then I would contact your dealer and ask them to investigate or try to fix the problem. It could be a number of issues like those above or even a handful more I haven't mentioned.
In terms of this review sample I didn't find any issues with uniformity of the image that were visible to the eye. It was a new unit that I put about 50 hours on during the review process. Hope that helps. For further advice and help, please use the projector forum.
I would like to know whether you used the BrilliantColor feature or not. From what I've heard it can boost up the contrast performance but may add image noise and other artifacts.
Also do you have any idea which version of DarkChip this projector uses? I haven't seen any mention of it...
And yes last but not the least, what a great review
in my case it does not matter whether i use brilliant color feature - it´s same result...artefacts persists. This projector uses 1-chip 0.65” DMD, 16:9, 12deg.LVDS, DDP3021 10bit panel.
I would like to know whether you used the BrilliantColor feature or not. From what I've heard it can boost up the contrast performance but may add image noise and other artifacts.
Also do you have any idea which version of DarkChip this projector uses? I haven't seen any mention of it...
And yes last but not the least, what a great review
User King Conan has same problem as me. So, here is possibility with early batch of this device. I will claim the defect, I suggest others do the same, it's not standard functionality or bulb burn-in issue !!!
All the color space points are similarly rotated clockwise just a very degrees. I understand that you did all you could with the color management for each individual point, but wouldn't the tint control rotate all points counterclockwise simultaneously in a global fashion to rectify or is my understanding of the tint control inaccurate. BTW-thanks for all the great CES videos.
User King Conan has same problem as me. So, here is possibility with early batch of this device. I will claim the defect, I suggest others do the same, it's not standard functionality or bulb burn-in issue !!!
Thx, Pavel.
I'm thinking of ordering one of these tomorrow or Tuesday, did you get a replacement?
sorry for late answer. I complained Projector. came thit statement:
Lamp has been replaced and projector was readjusted.
Result? Same problem with brightness!
So, I returned the projector again and Mitsubishi allegedly promised that it will be exchanged for another. However. I have doubts. In a very similar, if not the same package comes a new type and has the same problems: Mitsubishi XD600U 3D Projector I quote from review: Brightness uniformity. While very bright, the XD600U has a brightness uniformity of about 75%. Specifically, on our test unit, the bottom right corner was brightest, while the top left was the least brilliant. The difference between them is enough that you notice it on a full-screen white pattern. However, most content is considerably more varied than a full-screen white test pattern. While viewing photographs, for example, the difference in illumination was not visible most of the time.
It is likely that the new projector will have the same problems. In my terms is error in design, perhaps the problem with the optics.
Quote:
Originally Posted by DrugstoreCowboy
I'm thinking of ordering one of these tomorrow or Tuesday, did you get a replacement?
Just a FYI on the colour uniformity issue that was experienced...
Although I am returning my HC3800 because Incrediboy sees the RBE quite bad and for most of the time on any material, whilst I have had it up and running since Saturday, I found the uniformity of colour to be perfect:- I had no issues whatsover with the problem as described above. Buy with confidence if, like me, RBE is hardly noticeable and doesn't affect your enjoyment of the film.
Full HD 1920 x 1080 DLP
Reviewed by Phil Hinton
E. & O.E.