Re: What decides the Mono LCD gray scale?

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From: cool_harber (cool_harber_at_hotmail.com)
Date: 12/29/04 

Date: Wed, 29 Dec 2004 21:20:07 +0800

Thanks,But my lcd display looks so bad,
the text is more clear than the blurred icon or image!~
Can you share me your palette source code?
email:cool_harber@hotmail.com

"voidcoder" <voidcoder@yahoo.com> 写入消息新闻:eLG5VDP7EHA.2316@TK2MSFTNGP15.phx.gbl...
> If You want to use SA_Lcd driver for that - you are out of luck.
> There are no support for true 4bpp mode. However you can use
> 8bpp mode and turn on monochrome mode in the controller.
> Then just setup your palette with grayscale entries
> (modify DispDrvrSetPalette function). In this case You will have
> 8bpp in frame buffer memory, 4bpp output and 16bit lookup palette
> (where only lower 8bits are grayscale values). And of course
> You have to setup other LCD contoller settings: timings, clocks etc.
>
> At least it works o.k. for me on PXA270.
>
>
>
> "cool_harber" <cool_harber@hotmail.com> wrote in message
> news:eN2ZwbO7EHA.3076@TK2MSFTNGP15.phx.gbl...
>> The mono lcd`s gray scale is decided by lcd controller or lcd itself?
>> I have a mono lcd with 4 data pins and about 70 Hz frame frequence ,I
>> want to use PXA255 to controll it.Do I get 256 scale gray?
>> Any suggestion is appreciated.
>>
>>
>
>

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