Solved: PSP 3000 Scan Lines Are 100% Hardware Based

[wraggster]

http://cache.gawker.com/assets/images/4/2008/10/494x_psp200300.jpg

Nobody knew if it was the software or the hardware. Why was the PSP 3000, Sony's supposed best to date with an incredible screen, suffering from interlaced images? Logic Sunrise put both displays under a 40X microscope and saw the problem immediately. Can you tell the difference? Take a mental guess and then check if you're smarter than a Sony engineer:

http://gizmodo.com/5071355/solved-psp-3000-scan-lines-are-100-hardware-based

[osgeld]

um it has scan lines of
RRRRRRRRRRRRRRRRR
GGGGGGGGGGGGGGGGG
BBBBBBBBBBBBBBBBBBB?

and we cant blame this on sony engineers, some 3rd party (the old screens were made by sharp right?) craptards did this and some snake oil salesman jiggled some bits on a sony intern who then (lost) based his career on making a word document, which was passed up to the heads of SEGA er SONY's game division, at 4:57pm one friday, and got it rubber stamped

sony's engineers are too busy making betamax, minidisc and umd's to be bothered with a simple lcd screen

:thumbup:

[Veskgar]

This PSP 3000 screen drama is a huge failure. SONY is hoping and is probably right that most people won't notice and some won't care. But I definitely care and when the PSP 3000 screen is being touted as a step backwards its going to prevent me and a lot of others from purchasing it.

Who is the new manufacturer of the 3000's screen? Sharp still? And are they made in China?

[jamotto]

The scan line issue was blown way out of proportion it is no worse than the psp 2000 only the direction of the scan lines is different.

[Spanishpeacock]

The scan lines are worse than the 2000. Because they are more noticeable going left to right on a wide screen set up.
Think about it. They may be less "common" in a sense that there are more rows up and down from left to right, but games are used to that. Maybe Sony can make an option to "Optimize" the display, a.k.a. tone down the overall blue on games. Like picking colors on the GBC for older Gameboy Games.

[bah]

Hrm, something seems wrong with these conclusions.

Scan lines are an artifact of showing an interlaced signal on a progressive display.
Back in the day, to reduce the bandwidth needed to transmit the signal, TV stations would send frame frame with only 1/2 the image defined. Every odd frame number would carry only lines 1,3,5,7 etc and every even one would carry lines 2,4,6,8 etc (or vice versa).

CRT tvs are largely designed to display interlaced signals, so it is no problem. Analogue TV on a progressive display (LCD, CRT PC monitor etc) without deinterlacing the signal first produces scan lines (most noticeable on horizontal movement [character moves sideways, camera pans etc).
Real time deinterlacing isn't the best, but its better than nothing.

The PSP obviously has a progressive screen.
The PSP 2000, while having TV-out, could largely only be used on progressive displays.

The PSP 3000 was advertised as outputting interlaced signal to increase compatibility was it not?
It sounds more like a poor implementation of this has resulted in the PSP giving the inbuilt screen an interlaced signal rather than a progressive one. Why it does not give a proper progressive signal to the LCD and output to TV as interlaced though some additional minor hardware is quite odd.

My guess (what the article writer is stating is also a guess) is that the issue originates in output that the display hardware is providing the screen and not the screen panel itself.


The images shown show the 3 components of 1 pixel, Red Green and Blue sub pixels. A darker blue sub pixel comparative to the red and green should not really cause interlacing. The colour gamut would just not be so great.


I certainly could be wrong, but at least I am not stating things like '100% hardware based' and claiming the issue is certainly caused by poor blue sub pixels.



jamotto: The PSP1000 and 2000 suffer from screen blurring due to a very slow response time (the time it takes to transition a pixel from one colour to another) of their LCD panels.
Not only is the response time horribly slow, but LCDs update all pixels at once yet it takes a differing amount of time for them to make that change based on the distance from each pixels current colour state. This means when you have a slow LCD screen you get blurring due to the slowness of the transitions, and also due to the variance between the time each pixel takes to transition. The latter is more noticeable when the former is worse for obvious reasons.

This is a different, unrelated issue to scanlines/interlacing.