Some LCDs take positive and minus voltages, with VO being the contrast
On Wed, 17 May 2000, Tom Walsh wrote:
> CHEUNG_SANG wrote:
> > Hi,
> > The manufacturer of the LCD module is Giantplus. It is a 160*240 Grey
> > scale STN, its part number from manufacturer is GPG1624TWE1.
> > After i have looked throught the user's manual of ADS board. I found that
> > maybe i have to implement some extra circuitry to provide power for the
> > LCD connector, ie. VCC, VEE and VO. I may use the circuit for Epson
> > EG9013. Is that appropriate?
> Apparently VCC is the +5 feed to the display, VEE is the display bias(?), I don' t
> know what VO is, you need to check the one. Also, VEE can be either a negative OR a
> positive bias, depending on the manufacturer, the value for VEE can range between
> 4volts to upwards of 40volts (usually DC, not AC). If you do put together a power
> supply for the LCD, keep in mind that you *must* sequence the VCC & VEE supplies,
> failure to proper sequence these voltages (during power on/off) WILL destroy the LCD
> screen material very quickly.
> > Btw, if i can bring up the LCD, what value should i put in the INIT_LCD?
> > The examples in the mail list is 640*480 and 320*240.
> Use the two LCD descriptors that you got from the mailing list, I think I send those,
> and look them over, comparing the two sets of individual values. Then, while referring
> to the Dragonball controller manual, look at what these settings are supposed to do. I
> think that with a glance-thru of the manual the values should become clear, given the
> two examples of descriptors that you now have.
> > Tom, I remember in one mail, you said you can send the PDFs for LM32019
> > and EG9013. Would you send them to me?
> Better yet, I placed them on the Resources page of the site,
> 'http://www.openhardware.net/ez328simm/resources.html', there is probably more people
> who need the data as well.
> > And about the Sharp LCD you mentioned, is the quota full? If there is
> > still a vacancy, I may find a friend in US to receive for me. And about
> > the collector, is it a open hardware design?
> > Sorry for so many questions, i am now spending day to day for my kit.
> Not a problem, I have commitments (?) for up to 16, there is four more to go, if I can
> get a commitment from a cutstomers for future delivery of the LCD enabled product, I
> can order them.
> Tom Walsh - WN3L - Embedded Systems Consultant
> 'www.openhardware.net', 'www.cyberiansoftware.com'
> "Windows? No thanks, I have work to do..."
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