Vee is always negative, Vcc and Vdd are positive.
On Fri, 19 May 2000, CHEUNG_SANG wrote:
> Hi, everyone,
> Thanks for your help, I now can calculate the appropriate regesiter value
> and figure out what I should do next step. I would have to get the voltage
> boost and regulate chip LT1372HV first. I really don't know the chip
> DC0105 used by the circuit suggested by RTcontrol. Anyway, I have to build
> the circuit myself.
> A stupid question, can I assume that the LCD in my hand is capable of
> Both Positive Bias voltage VEE and Negative VEE. Because when I check with
> ADS board manual, it says it will output Negative VEE. But when I check
> the LCD module Data sheet, it state 23V for VEE (no clear sign for + or
> -). And the worst is that I don't have the data sheet for the connector
> circuit. So I am just mixed up by the Polarity of the VEE.
> 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.
> > TomW
> > --
> > Tom Walsh - WN3L - Embedded Systems Consultant
> > 'www.openhardware.net', 'www.cyberiansoftware.com'
> > "Windows? No thanks, I have work to do..."
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