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Just wondering what is the resolution of ES920's screen and if it can possibly replace the MP7SE's screen. In the videos, the dimensions seem the same to me.


Kawai MP7SE, Yamaha MOTF XF6, Yamaha WX5, Yamaha Pacifica 112v
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I don’t have either keyboard, but based on my long knowledge of computer-based electronics, I’m just gonna say “unlikely.”


Rodney Sauer
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That depends on the resolution, but more importantly the number of pixels across the width and height...

...then the interface/connection... and more!

If you have a look at this page, on the left-hand-side, you’ll see various options/specs:
https://uk.rs-online.com/web/c/displays-optoelectronics/displays-industrial-monitors/oled-displays/

Trying to get a new display for my Onkyo mini hifi proved to be an absolute P.I.TA - everything had to be spot on. I gave up because it was an odd size.

Last edited by OscarRamsey; 10/27/20 03:11 PM.

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I'd say they can be! The screen resolution of ES920 is 128 x 64 pixels (OLED) which is the same as MP7SE. Assuming the underlying firmware is the same, there is a chance for compatibility.

I like the OLED screen way more than the annoying blue screen.

The silly thing is black and white is known to be superior in readability scientifically yet many companies use blue when it comes to matrix displays...

Last edited by Abdol; 10/27/20 03:32 PM.

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Originally Posted by Abdol
Just wondering what is the resolution of ES920's screen and if it can possibly replace the MP7SE's screen. In the videos, the dimensions seem the same to me.

The ES920 (OLED) and MP7SE (LCD) both use a 128x64 pixel resolution screen, however the technologies used to render these displays are completely different.

As far as I'm aware, the parts are not interchangeable.

Kind regards,
James
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Employed by Kawai Japan, however the opinions I express are my own.
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Thanks James. Just wondering if you can give us the part number/names? They are usually some workarounds even if it can't be replaced, there might be a better graphic display like this:





If you look at the video you can see how better the B&W screen is compared to blue... and that's not OLED.


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Originally Posted by Abdol
Just wondering if you can give us the part number/names?

No, I'm afraid not.

Originally Posted by Abdol
If you look at the video you can see how better the B&W screen is compared to blue... and that's not OLED.

Yes, you can also replace the original screens in other retro handheld consoles (Sega GameGear, Atari Lynx, etc.) with brighter, more responsive, lower energy consuming alternatives.

However, unless there is a hidden Easter Egg in the instrument that I'm not aware of, I don't believe it's possible to play Mario on an MP7SE. Therefore, the merits of swapping out the original display with an alternative part are not so compelling.

Kind regards,
James
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I think display on MP7SE is excellent.

But bothered by blue, I imagine there might be a piece of plastics to cover and change color and improve contrast.

All color displays I have owned with backlit, the backlit itself is adjustable as well.
So you can try back and forth to get blackness and brightness optimized.
Maybe that is something firmware for MP7SE can fix if some feel contrast is weak.


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Based on what KJ is saying, the dot matrix/LCD/display controller chip might be different... or the interface... not sure.

Some screens come with the chip already attached, in which case those attached chips might be programmed differently - another possibility?

Here’s a very basic chip used in hobby projects:
https://www.sparkfun.com/datasheets/LCD/HD44780.pdf

So, err, something as simple as a display has a lot going on - more than a pivot point on the action? 😅

Last edited by OscarRamsey; 10/28/20 09:41 AM.

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Thanks, James.

As a Kawai rep here, KJ would never encourage us to do such a thing. To figure this out, someone needs to investigate the internals of each keyboard, find the model/brand of the screens, and the chips they use.

The nice thing with OLED is that there is no "backlight". So it won't bother eyes as much as a backlit graphic display (with blue backlight!) does.

BTW blue is the worst light you can use on a screen:

https://www.health.harvard.edu/blog...degeneration-and-blindness-2019040816365

So I hope Kawai also hires a knowledgeable UI/graphist designer that knows about minor details like this.


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^^

It might be possible, you never know.

If they are different as KJ says, you’d need is an oscilloscope to ‘sniff’ the serial commands to the LCD driver. This basically decodes what serial commands it’s sending to the chip to display different things. You then tack-on an add-on circuit to translate the commands to a different serial protocol to drive, for example, a nice OLED display.

You could take your MP7SE apart... post detailed pics... perhaps there is a ‘standard’ replacement part out there somewhere with a different coloured backlight.

Even if it’s not possible, it’s all interesting and gets the brain working. smile


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We all know that there will be a time when the keys start failing... that's the time when I will order the plastic bubbles and will investigate the screen smile


Kawai MP7SE, Yamaha MOTF XF6, Yamaha WX5, Yamaha Pacifica 112v

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