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Messages - MT5555

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1
TFTs / Re: NHD-4.3-480800EF-CTXP backlight
« on: July 23, 2014, 01:41:54 PM »
Hi,

I'm trying both, adjusting the duty cycle and the frequency.  Doesn't seem to make a difference as far as my eyes can see.

How about you? 

My guess is that the whole purpose is to reduce the average ON time per second of the LCD.  This in turn affects its overall brightness.  Whether that's done via duty cycle or frequency in theory should not matter too much.  But hey, what do i know..

Have you got anything displaying on screen yet. 

If you're using the same display as I am NHD-4.3-480800EF-CTXP, would you like to stay in touch via email?

Let me know please.  Thanks.



2
TFTs / Re: NHD-4.3-480800EF-CTXP backlight
« on: July 23, 2014, 12:33:13 PM »
Could someone answer the above question.

Because I have the same question.

I've connected :

pin 2 to 3V
pin 3 to GND
pin 39 to a PWM going at 10kHz

I see the LEDs in the frame light up on power up.  But I cannot seem to control their brightness (as far as my eyes can see) by varying the PWM frequency. 

Is the backlight in this LCD fixed to a certain level of brightness with the BLPWM (pin 39) being of no real use.  Please confirm. 

3
TFTs / Re: NHD-4.3-480800EF-CTXP# driver question
« on: April 22, 2014, 11:35:25 AM »
One more question please.

We intend to use this display in landscape as opposed to portrait mode. 

Since this display is IPS, the image quality should not be affected - is that correct?

Is there anything (the glass or whatever) that would prevent or reduce the quality of the image (as seen by a viewer) if seen in landscape as opposed to portrait mode?

Thanks

4
TFTs / Re: NHD-4.3-480800EF-CTXP# driver question
« on: April 21, 2014, 11:36:45 AM »
Thank you brother. 

So it sounds like individual pixels on this display are addressible... unlike the other 4.3" displays which had only a driver but no controller.

Does New Haven plan to keep the NHD-4.3-480800EF-CTXP# in production for a few years?  Hopefully it isn't a here today and gone tommorrow type of product.

5
TFTs / NHD-4.3-480800EF-CTXP# driver question
« on: April 17, 2014, 12:48:43 PM »
Hello,

We are thinking of using NHD-4.3-480800EF-CTXP# for our project. 

It has a Driver: HX8369 but apparently no controller. 

Exactly how would I reference an x,y position on screen.  Do I have to essentially "mask" write through all the pixels on the screen to reach a certain x,y position?  If not what is the simplest way to write a pixel to x,y?

Is there any way to skip from one column to the next without having to write the 480 pixels on each column (assuming landscape mode) to get to an x,y position?

Any info would be useful at this point.

Thanks

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