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### Topic: Displays... (Read 8307 times)previous topic - next topic

#### igorreal

#15
##### Jul 12, 2009, 07:59 pm
One easy question:

How can I calculate the space require to store a bitmap in a dot graphic display?

For example, if I have a display of 128x64 dots

Kind Regards,

Igor R.

#### mem

#16
##### Jul 12, 2009, 08:19 pmLast Edit: Jul 12, 2009, 11:33 pm by mem Reason: 1
total bytes equals width times height times bits per pixel divided by 8

128 x 64 with 8 bits (1 byte) per pixel is 8k bytes

#### igorreal

#17
##### Jul 12, 2009, 09:04 pm
Thank you mem!!!

Anyone knows which is the LCD and touch used in LCDash project? (Megasquirt)

http://lcdash.wikispaces.com/LCD
http://lcdash.wikispaces.com/touchscreen

Regards,

#### florinc

#18
##### Jul 12, 2009, 11:06 pm
Why 8 bits per pixel if this is a monochrome display?

#### mem

#19
##### Jul 12, 2009, 11:50 pm
In the first post the OP said he would ideally like a color display if possible

#### EmilyJane

#20
##### Jul 13, 2009, 12:12 am
Linked from the site you referenced:

http://www.diyautotune.com/catalog/lcdash-digital-touchscreen-dash-display-for-megasquirt-p-167.html

Looks kind of pricey to me. It looks like a transmissive type where I would think for outdoor readability you'd want a transflective.

#### igorreal

#21
##### Jul 13, 2009, 09:56 am
EmilyJane,I want only the display, not the entire solution... I suppose the display is \$60 or something similar...

In a monochrome display, the calculation is different?

Igor R.

#### AWOL

#22
##### Jul 13, 2009, 10:05 am
Quote
In a monochrome display, the calculation is different?

Depends - monochrome could be one bit per pixel, so 128x64 would requires 8192 bits = 1024bytes.

OTOH, you could have maybe a monchrome greyscale of, say four bits per pixel, so in that case, you'd need four times as much memory, or 4kbytes.
"Pete, it's a fool looks for logic in the chambers of the human heart." Ulysses Everett McGill.
Do not send technical questions via personal messaging - they will be ignored.
I speak for myself, not Arduino.

#### igorreal

#23
##### Jul 13, 2009, 10:13 amLast Edit: Jul 13, 2009, 10:15 am by igorreal Reason: 1
With the KS0108 or T6963 controllers, do you know the bits per pixel?

It´s only to think about the amount of space required...

Thank-u!

Regards

Igor R.

#### mem

#24
##### Jul 13, 2009, 10:50 amLast Edit: Jul 13, 2009, 10:50 am by mem Reason: 1
ks0108 and similer are 1 bit per pixel, so 128x64 memory is 1k bytes

#### EmilyJane

#25
##### Jul 13, 2009, 05:44 pmLast Edit: Jul 13, 2009, 05:47 pm by EmilyJane Reason: 1
Oops, sorry, I thought that sounded a little high.

I think something like this:
http://www.crystalfontz.com/product/CFAG12864B-TFH-V

is what you are looking for. It's around \$34 and it is a transflective display, which is the most sunlight readable of the LCD displays, in my experience. It also has an LED edgelight, which will allow reading in darker conditions.

#### igorreal

#26
##### Jul 13, 2009, 06:06 pm
Thank you!!

I suppose they´re using this http://www.crystalfontz.com/product/CFAG240128L-TMI-TZTS.
Because of it´s 240x128 and touchscreen (\$87).

In the web say that the best for sunlight are Reflective or Transflective. (Yellow/Green LED Backlight or White Edge LED Backlight ).

The blue one is Transmissive...

Uff... a lot of differents technologies... I´m quite confused...je,je,je

#### EmilyJane

#27
##### Jul 13, 2009, 06:29 pm
You need to make up your mind about how many pixels you want and then buy a transflective display. I don't see the problem.

#### igorreal

#28
##### Jul 13, 2009, 07:37 pm
ja,ja,ja

I would like KS0107/KS0108 or Toshiba T6963 because it´s easy to implement and there are many info and libraries in internet.
Something like this: http://www.crystalfontz.com/product/CFAG240128L-YYH-TZ

Size: 240x128 or 160x128

But in stead of Yellow/Green led backlight, I would like blue or red backlight. Both would be fantastic!!
Letters-Graph in black and background in blue is a perfect combination!!

Example:

Is it possible change the leds?

#### EmilyJane

#29
##### Jul 13, 2009, 07:55 pm
If you can make do with 128 x 64, they have one with an RGB backlight:

http://www.crystalfontz.com/product/CFAG12864A-CFH-TA

With the proper psychic sensor software in your Arduino, it would be like a two-wheel mood ring!

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