LCD interfaces
in [Embedded]
|
From: D Yuniskis on 25 Feb 2010 15:47 Hi, Most of the things I design don't have traditional displays, so... :< Aside from mechanical differences in connectors (a consequence of the number of "color bits"), can I safely design a generic LCD interface without preselecting the actual display panel? I'm looking at small-ish panels (3" - 8") with an emphasis on low power consumption. Is there a magic cutoff point between LED backlighting vs. CCFL's? (i.e., this would impact the controller's design as well) Thanks! --don
From: linnix on 25 Feb 2010 15:53 On Feb 25, 12:47 pm, D Yuniskis <not.going.to...(a)seen.com> wrote: > Hi, > > Most of the things I design don't have traditional > displays, so... :< > > Aside from mechanical differences in connectors > (a consequence of the number of "color bits"), > can I safely design a generic LCD interface > without preselecting the actual display panel? You can have Intel or Mot styles, 1 or 4 bits serial, 8, 16 or 32 bits parallel. With / without backlite. With / without touch panels. So, the short answer is probably not. > > I'm looking at small-ish panels (3" - 8") with > an emphasis on low power consumption. > > Is there a magic cutoff point between LED backlighting > vs. CCFL's? (i.e., this would impact the controller's > design as well) CCFL needs 40V to 50V minimum. So, LED is easier for most people to handle. > > Thanks! > --don
From: D Yuniskis on 25 Feb 2010 16:49 linnix wrote: > On Feb 25, 12:47 pm, D Yuniskis <not.going.to...(a)seen.com> wrote: >> Hi, >> >> Most of the things I design don't have traditional >> displays, so... :< >> >> Aside from mechanical differences in connectors >> (a consequence of the number of "color bits"), >> can I safely design a generic LCD interface >> without preselecting the actual display panel? > > You can have Intel or Mot styles, 1 or 4 bits serial, 8, 16 or 32 bits Huh? I'm talking about the bare *panel*, not controller. > parallel. With / without backlite. With / without touch panels. So, > the short answer is probably not. Touch panel is a separate issue and addressed via touch panel interface (from what I have seen, the touch panel is a seperate assembly, seperate connector, etc. -- even if it is purchased "married" to the display panel) >> I'm looking at small-ish panels (3" - 8") with >> an emphasis on low power consumption. >> >> Is there a magic cutoff point between LED backlighting >> vs. CCFL's? (i.e., this would impact the controller's >> design as well) > > CCFL needs 40V to 50V minimum. So, LED is easier for most people to > handle. Most of the CCFL inverters I have seen were ~12V powered. Regardless, my question was trying to determine if there is a *size* beyond which LED is impractical (inefficient in terms of cost).
From: linnix on 25 Feb 2010 16:47 On Feb 25, 1:49 pm, D Yuniskis <not.going.to...(a)seen.com> wrote: > linnix wrote: > > On Feb 25, 12:47 pm, D Yuniskis <not.going.to...(a)seen.com> wrote: > >> Hi, > > >> Most of the things I design don't have traditional > >> displays, so... :< > > >> Aside from mechanical differences in connectors > >> (a consequence of the number of "color bits"), > >> can I safely design a generic LCD interface > >> without preselecting the actual display panel? > > > You can have Intel or Mot styles, 1 or 4 bits serial, 8, 16 or 32 bits > > Huh? I'm talking about the bare *panel*, not controller. Are you building the controller yourself? A QVGA panel requires 500+ signal lines.
From: Nico Coesel on 25 Feb 2010 19:09
D Yuniskis <not.going.to.be(a)seen.com> wrote: >Hi, > >Most of the things I design don't have traditional >displays, so... :< > >Aside from mechanical differences in connectors >(a consequence of the number of "color bits"), >can I safely design a generic LCD interface >without preselecting the actual display panel? You cannot. Selecting an affordable panel is a world of pain. Make sure you can get the cables as well! -- Failure does not prove something is impossible, failure simply indicates you are not using the right tools... nico(a)nctdevpuntnl (punt=.) -------------------------------------------------------------- |