TI-H: Re: Re: Color backlighting

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TI-H: Re: Re: Color backlighting

For experiments we might not have to open the calculator.  we could have the 3 LEDs shine onto the screen as the gameboy light does it.
 
************
oh, somebody built a plexiglass LCD background with LED's placed on the sides...
          LCDLCDLCDLCDLCDLCDLCDLCDLCDLCD
LED  PLEXIPLEXIPLEXIPLEXIPLEXIPLEXIPLEXI    LED
          MIRRORMIRRORMIRRORMIRRORMIRROR
 
I am not sure how uniform it came out... but it was cheap... and didn't have that super long cable on the side.
*************
 
I am not sure weather the 7greylib
         Copies the plane to videomemory, forces refresh
or
         changes a some memory that represents the address of the new plane then forces a refresh.
 
 
3 planes for 3 LEDs.  1 represents activated pixel
 
     Green  Red  Blue Black  White  Yellow  Magenta  Cyan
R      1     0     1    1      0     0         0       0
G      0     1     1    1      0     0         1       1
B      1     1     0    1      0     1         0       1
 
we would have to add code to do a pulse on the link cable right before the screen refresh.
The light would have somesort of counter that would change the lightsorce at each pulse and hold it untill the next pulse.
 
----- Original Message -----
From: "David Knaack" <dknaack@genesis.genetech.net>
To: "TI Hardware" <ti-hardware@lists.ticalc.org>
Sent: Friday, April 14, 2000 6:23 PM
Subject: TI-H: Re: Color backlighting

>
> > one of the problems would be memory no matter what you do
> > color and displays take up a lot of memory
>
> Since this is a palettized color display (sort of), it will
> not require significantly more memory than a regular greyscale
> system.
>
> > also color will be a major problem on the power.
> > color LCDs use four screens one for light saying that the
> > LCDs themselves don't generate any light, then they do have
> > screens for the primary colors,
>
> The backlighting system will use three high brightness LED's
> and a fiberoptic backlight, the power draw should be fairly
> low, lower than most LED backlights.
>
>
> My biggest unknown at this point is how to use the color
> planes.  How exactly are the masks built to display a
> particular image?
>
> Could someone explain in moderate detail how the screen
> is handled to produce grayscale images?
>
> DK
>
References: