[stella] Flickering on LCDs

[Darrell Spice, Jr.]

it's probably trying to deinterlace and upscale the signal and is  
getting confused because it's expecting 480i and getting 240p.  You  
may wish to check your HDTV's manual to see if it has any settings to  
control it(probably in the menu with video options).

My HDTV doesn't like the 240p signal put out by older consoles(I've  
tried my Atari & Genesis).  I normally get a blue screen which means  
unable to sync to the signal.

On Apr 15, 2008, at 1:08 PM, SeaGtGruff at aol.com wrote:

> Well, it makes sense to me that the lines are thinner, because it's  
> a 1080p HDTV-- more than twice as many lines as an interlaced 525- 
> line image-- but I know almost nothing about how LCD TVs work, as  
> compared to a liitle bit about how CRT TVs work. Yet it does seem  
> odd to me that a standard 262-line Atari game screen looks solid,  
> with no apparent gaps between scan lines, whereas a 262-line  
> flickering Venetian blinds display shows gaps, and the lines for  
> each frame are vertically offset from each other a little bit, as  
> follows:
>
> --------________--------________
> --------________--------________
> --------________--------________
> etc.
>
> I mean, the lines on each frame should be aligned together,  
> shouldn't they? I could understand it if I was generating a 262,5- 
> line interlaced screen, but it's just two 262-line screens flickered  
> together. This is interesting; I'll have to start reading up on  
> LCDs, HDTV signals, etc.
>
> Michael
>
>
> -----Original Message-----
> From: Thomas Jentzsch <tjentzsch at web.de>
> To: Atari 2600 programming list <stella at atari2600.org>
> Sent: Tue, 15 Apr 2008 2:40 am
> Subject: Re: [stella] Flickering on LCDs
>
> Michael wrote:
> Okay, I just played E.T. Book Cart on my HDTV, and it was definitely  
> different.
> For one thing, there is no apparent flickering-- the two frames are  
> blended
> together without the annoying, seizure-inducing flashing that I got  
> on my old
> SDTV. That's actually very cool. However, the lines on the second  
> frame are
> slightly-but-noticeably lower than the lines on the first frame, and  
> the overall
> blended picture has definite blank lines between the lines of color  
> (from the
> Venetian blinds). The Tron Man Picture Cart-- which uses Andrew's 3- 
> frame RGB
> technique-- looks pretty darn good, too, although some flickering is  
> noticeable.
> I'll have to try out a 262.5-line interlaced display on it one of  
> these days.
>
> I suppose that's coming from the varrious picture optimizations  
> build into
> modern LCDs.
>
> Actually you should be lucky if it works out fine, because I am  
> pretty sure,
> nobody tests those optimizing algorithms with ancient hardware.
>
> Have fun!
> Thomas
> _______________________________________________________
> Thomas Jentzsch         | *** Every bit is sacred ! ***
> tjentzsch at web dot de |
>
>
>
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Darrell Spice, Jr.
darrell.spice.jr at spiceware.org



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