Screen Response Time

[jimb]

Since the GP2X features the same screen as the GP32 BLU unit I'll direct this question to those owners (and the devs of course) ...

I know there have been comparions between PSP and GP2X and the general opinion is that the GP2X screen output is much brighter. Assuming this is correct, what's the response time of the GP2X's screen like?
In other words, do you get any ghosting with fast-movng stuff?
Examples:

* Starfield scrolling
* sprites moving on a black background

 

[Jarska333]

BLU+, actually. And mine had no apparent ghosting or any other issues, bar the BLU+ bugs, and some OC waves.

 

[elinscheid]

The ghosting on the PSP screen is very apparent to me, I hope the GP2X has a faster response time! :unsure:

 

[digitaljez]

I have a BLU+ and the display is crisp - no tracing/blurring. Its bright and clear. I want the exact same screen in the GP2X. It is so much better than the FLU.

To test this I used the spaceship in GPeskiv to check it out in a dark room at night with the light off. I thought I detected a slight trace left by it but I wasn't sure if it was my own persistence of vision. I got a much younger pair of eyes to check it out and they could not see any tracing. So if there is any it takes an effort to detect it.

 

[DaveC]

Since the GP2X features the same screen as the GP32 BLU unit I'll direct this question to those owners (and the devs of course) ...

I know there have been comparions between PSP and GP2X and the general opinion is that the GP2X screen output is much brighter. Assuming this is correct, what's the response time of the GP2X's screen like?
In other words, do you get any ghosting with fast-movng stuff?
Examples:

* Starfield scrolling
* sprites moving on a black background

​

The screen is far brighter and the contrast is much better (better blacks) on the PSP. The PSP screen is probably double as bright as the GP32 BLU and therefore the GP2X as well. The good thing is that there is no noticeable ghosting and smearing on the GP32 BLU unlike the PSP.

 

[craigix]

I was trying some homebrew on the PSP yesterday and I could not believe how bad the ghosting was, it was like a game gear or something from the early 90's. I'm amazed its not complained about more.

Never seen anything like that on any GP32 screen.

 

[junker]

i know i was complaining about it back when i had my psp! smearing all over the place, but perfect for slow moving/static.

i don't understand why no one brings that up when talking about emulation on the psp, though..

 

[Robster]

The screen is very good, far better than the PSP from what I've seen.

By the way, it's model TS35ND2501 from Top-Sun and the product page says it has a 25ms response time. Not top-line if you look at LCD monitors for gaming PCs, but certainly good enough. If anyone finds any technical data on this LCD module, let us know!

 

[DaveC]

I was trying some homebrew on the PSP yesterday and I could not believe how bad the ghosting was, it was like a game gear or something from the early 90's. I'm amazed its not complained about more.

Never seen anything like that on any GP32 screen.

​

I think the Game gear had a faster display

 

[DaveC]

The screen is very good, far better than the PSP from what I've seen.

By the way, it's model TS35ND2501 from Top-Sun and the product page says it has a 25ms response time. Not top-line if you look at LCD monitors for gaming PCs, but certainly good enough. If anyone finds any technical data on this LCD module, let us know!

​

25 ms seems real slow. I know when playing games on the GP32 BLU or BLU+ I don't notice any smearing though. I have tested with Galaxians and watched the starfield at FS0 and it didn't blurr out really.

The PSP screen must have about a 1 second response time then.

 

[Digital Awakening]

25ms sounds like a lot though. I have a 16ms monitor, there's almost no ghosting but things get a bit blurry when there's a lot of fast movements like when playing an FPS.

 

[K-teto]

Since the GP2X features the same screen as the GP32 BLU unit I'll direct this question to those owners (and the devs of course) ...

I know there have been comparions between PSP and GP2X and the general opinion is that the GP2X screen output is much brighter. Assuming this is correct, what's the response time of the GP2X's screen like?
In other words, do you get any ghosting with fast-movng stuff?
Examples:

* Starfield scrolling
* sprites moving on a black background

​

Like THIS?
Try it, the controls are:
Start: to skip the rlyeh's devkit logo.
A: accelerate.
B: brake.
Directions: ... obvious...
Start+Select: Exit program.

 

[junker]

maybe it's 25ms NOT grey-to-grey, but black-to-white??
anyway, i'm sure the psp's lcd has 22ms grey-grey response time, and even with that it ghosts SO much. i'm sure the blu+ screens have minimal/zero ghosting, but 25ms seems a little high...

anyway, ratings sometimes don't mean much since my lcd is rated for 20ms i think(hydis panel), but has near zero ghosting, even with the fastest fps games.

 

[worldwriter]

TS35ND25-01 is a transmissive type color active matrix liquid crystal display (LCD) which uses amorphous thin film transistor (TFT) as switching devices. This product is composed of a TFT LCD panel, driver ICs, FPC and a LED backlight unit.

Features

1. Digital 24-bits RGB interface for real time playback and 16.7M colors
2. Landscape orientation
3. Low power consumption / LED backlight
4. High resolution (QVGA / 116 dpi)
5. Build-in LCD timing controller
6. Run with default initial setting in most applications
7. Wide-viewing angle

Specification

Screen Size 3.5 inch

diagonal Aspect Ratio
4:3

Number of Pixels
320 x RGB x 240


pixels

Pixel Pitch
0.219 (H) x 0.219 (V) mm

Active Area
70.08 (H) x 52.56 (V) mm

Outline Dimension
76.9 (H) x 63.9 (V) x 3.2 (T) mm

Display Mode
Normally White/Transmissive

Pixel Arrangement
RGB-stripe

Input Interface
Digital 24-bits RGB

Display Color Number
16.7 M

Viewing Direction
6 O’clock

Weight
33.8g

Response Time
25 m sec

Brightness
250 nits

Contrast Ratio
300:1

Viewing Angle
60/60/50/55

 

[K-teto]

Uh... the url for the fxe was invalid, you can download it now thanks to rlyeh (i love u man) here

 

[jimb]

Thanks everyone. Great feedback.