DEA Factory MyPlay gaming tablet audio and display observations

Release of Archos GamePad tablet based on a RockChip dual core 1.6 GHz SoC with 4-core Mali 400 MP made me curious about this kind of hardware.

Archos tablet is announced at a price point of 149€ with Jelly Bean, 8GB of total storage and an interesting physical button mapping tool.Thanks to Jean Luc Castellani, JBmm.fr author, I had a glimpses of what’s inside this one after he sent me a Voodoo Report.

Yesterday I saw something similar but priced at 99.99€ instead as I was running errands in a French Leclerc general store: the DEA Factory MyPlay

DEA My Play tablet99.99€, possibility to return it during 7 days (no re-stocking fee). Sold!

Honestly I was first surprised it was working properly as I was expecting much worse for such a cheap price. So I was quite impressed by the fact it’s a complete device.
I won’t make a full review here but just observations, de-facto incomplete.

Things I liked:

  • Working and configurable HDMI output
  • Okay headphone audio quality: not outstanding but surprisingly better than many pricier devices on market.
  • Reasonably low weight
  • Pre-rooted: that my friend is really lovely. Su binary present and insecure adb.
  • It has Google Play store, and.. well, it works!
  • Hardware is weak but the software probably makes most of it already: very close to AOSP, good quality port, no glaring problem.
  • Not very sensitive but okay multi touch capacitive digitizer.
  • Out of the box USB host capability and connection cable.

Things I disliked:

  • Display:
    • Mirror effect, reflectance is quite high
    • Viewing angles, well yes it’s a TN panel, I’m not used to that anymore
    • Highly visible sub-pixel grain, plane surfaces appearing as an uneven RGB matrix varying in its appearance with viewing angle.
    • 44 Hz refresh rate on the panel instead of standard 60 Hz.
    • Poor color calibration with a strong blue cast and clipping in blue channel.
  • General slowness and lag mostly due to poor I/O performance leading to the device becoming barely usable at times.
  • Audio / Video de-synchronization on HDMI, annoying when playing videos.
  • Not a powerful gaming platform:
    • Weak CPU: announced as 1.5 GHz Cortex A8 but runs at 1 GHz max.
    • Weak GPU: Mali 400, yes but its slowest single-core implementation, not comparable to Archos GamePad quad-core Mali 400MP.

Audio measurements:

Like I said audio is quite decent when you plug headphones. The audio codec is not named by its driver so I don’t know exactly what’s inside.

THD values are low, and IMD+Noise stay reasonable as well unless you increase the output volume which leads to no obvious distortion but still an audible loss in quality when driving high quality low distortion headphones like Sennheiser HD 650.

Jitter is present but typically not audible, there’s no resampling artifacts either and frequency response is quite flat. If I bought this device it was also to measure how an Android device made of as cheap as it gets components was doing in the audio department and once again I’m observing price is not an indicator of audio quality.

Hiss, tested with very sensitive isolating Sennheiser SE535 in-ears is audible but okay. With some ALSA hacking the amp becomes almost black with no audible noise. Once again this is something many device sold at much higher price are unable to do.

Maximum volume is also quite loud (sorry no measurements here) and I doubt you’ll be lacking here with any kind of headphones.

RMAA measurements results for a comparison between Android volumes

I would recommend choosing volume 12 or 13 as line-out level if you plug an external amplifier.

Display measurements:

One good point is contrast ratio, at 920:1. Everything else is pretty unimpressive.

 

This is why this display appears blueish, even more than its white point suggests.

This is why this display appears blueish, even more than its white point suggests.

Reasonable Gamut for a low cost tablet, but white points and saturations are all over the place.

Reasonable Gamut for a low cost tablet, but white points and saturations are all over the place.

No black clipping

No black clipping

Noticeable highlights clipping especially on blue channel

Noticeable highlights clipping especially on blue channel

Blue is is not quite at the level it should for a 6500K white point, and not linear either.

Blue is is not quite at the level it should for a 6500K white point, and not linear either.

Very blueish appearance

Very blueish appearance

And of course the gamma value increase (darker) then some colors are inverted when looking from below the ideal viewing angle and and decrease (brighter) when looking from upper.

Some more images:

DEA Factory MyPlay Quadrant score

Quadrant score

DEA Factory MyPlay HDMI Settings.1024x600 UI is scaled to the output resolution, video surfaces are treated separately: a 1080p video will be shown with 1:1 pixel mapping on 1080p HDMI settings.

HDMI Settings.
1024×600 UI is scaled to the output resolution, video surfaces are treated separately: a 1080p video will be shown with 1:1 pixel mapping on 1080p HDMI settings.

DEA Factory MyPlay Battery usage when playing a 720p video from a DNLA server on Wi-Fi, at about 70% brightness level.That's about 3x 45minutes episodes watched in a row.

Battery usage when playing a 720p video from a DNLA server on Wi-Fi, at about 70% brightness level.
That’s about 3x 45minutes episodes watched in a row.

DEA Factory MyPlay display RGB grain, see fullsize to have the best idea of how it looks in person.

DEA Factory MyPlay display RGB grain, see fullsize to have the best idea of how it looks in person.

 

Galaxy S III International black crush

This is an answer to

Some context

Galaxy S III Super AMOLED HD panel is a lot better calibrated than any previous Samsung AMOLED generations.

Also, compared to previous HD displays using the same tech, it doesn’t suffer from visible grain or texture anymore when displaying non-bright pixels, and the luminance is also a lot more homogeneous which indicates new methods are used during its fabrication.

Super AMOLED color rendering accuracy and consistency across multiple samples always has been a huge difficulty for Samsung because of weak factory calibration process and possibly unstable materials.
I’ve been delight noticing with Galaxy S III, a lot of great work has been done by their engineers on this: consistency between devices seems improved (I’ll need more data here to really talk about that) and factory calibration seems good.

If the “panels” engineers did huge progress this time, there’s still a lot to critic about what have been done probably by another team, who turned every knobs like

  • Display sharpness
  • Color saturation
  • Response curve in shadows

…to the red zone, when, you know, it becomes “too much”.

Measurements

So.. where should we look at in those graphs?

First, there’s an issue with shadows, it should be noticeable in the luminance graph right?But.. nope, it’s not visible this way. Let’s switch to another view with the gamma graph:Issue spotted! Lets investigate a little more with near black measurements:Leaving no doubt, the color profile attached to the display is mis-configured in its shadow part: the curves should follow the dotted one.

The answer

Galaxy S III (let me precise one more time: GT-I9300 version) is indeed not calibrated properly. US Galaxy S III have are calibrated differently.
There’s no real point saying its hardware or software related because it’s a driver mis-configuration. So the result is about the same. I mean: some display hardware with issues could be corrected by applying a color profile calibration.

However let’s be clear: there’s should be nothing wrong with the hardware except if you got unlucky and in this case I recommend an exchange.

The issue is fixed in Display Expert prototype, and it has no side effect whatsoever.
So.. you’ll see more about that later.