EPD controller difference in i.MX6 and i.MX7

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EPD controller difference in i.MX6 and i.MX7

Contributor I

I would like to the differences related to EPD controller driving E-ink display for ereaders between i.MX6 and i.MX7

Is there any improvements regarding this in i.MX7?

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NXP TechSupport
NXP TechSupport

Hi Kishor

yes i.MX7 EPD improved, in particular LUT memory increased twice.

Please create service request for obtaining more info.

Best regards



Note: If this post answers your question, please click the Correct Answer button. Thank you!


Contributor I

Hi Igor,

From this thread:


I got the answer that LUT memory is increased twice. Can you let me know

the impact of that?

From this link:


See below snip.

Do you think below information is valid?

"The IMX 7 Dual will be the saving grace of e-readers, it has been totally

optimized for e-ink Regal and whatever new technologies that are released

by E INK in the future.

Why is this important? Page turn speed will be dramatically increased. In

the past this mechanism was handled by software, which prevented companies

like Amazon, Barnes and Noble and Kobo from taking a big step forward in

innovation. Now, page turns are handled by the hardware itself.

The rate in which page turn speeds occur heavily depend upon the waveform

that the e-Reader uses. The update times can range between 125 mSec – 500

mSec. By integrating the REGAL waveform support in hardware, Freescale

are taking away any additional time that would be added due to Algorithm

processing on the Cortex-A core, hence a savings of up to 150 mSec.

Solving the page turn program is a big step forward, but that’s not the

only thing that is being remedied. Ghosting will also be solved with this

framework, which is a huge deal. Normally with e-readers you will have a

full page refresh every six pages or in some cases every chapter. The

reason for this, is the longer the display goes without a full page refresh

text gradually starts super imposing itself, which makes it difficult to

read. I have never liked full page refreshes, as it breaks reading

immersion. Now, this will also be fixed, which means less full page

refreshes because again, its now hardware based, instead of software.

Likely the largest innovation in the IMX product line is the support for

hardware dithering. This will allow e-reader companies that work with the

Linux or Android platforms to be able to include animated content. This

will include truly animated page turns, interactive menus and video.



On Thu, Mar 3, 2016 at 6:14 AM, igorpadykov <admin@community.freescale.com>

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