We call it chip-on-glass, and it actually improves the reliability of the device. When thiese devices first came out they used a Hitachi processor/IC. Then some Koreans made a clone (shifted around some control words), then the Chinese made their clone ICs (more control word shifts and incompatibilities). Sanity descended, now everything is hidden under the epoxy bond, and compatibility has returned.
On Wed, Feb 6, 2013 at 12:18 AM, Roger Critchlow <[email protected]> wrote: > Another mystery of these displays was solved for me the other day when > Bunnie took his Media Lab visitors to a direct chip bonding shop in > Shenzhen. On the back of the bog standard LCD display there will often be > a dome of black epoxy in place of a chip. I thought they were hiding the > chip, but in fact the dome covers a piece of raw silicon integrated circuit > glued to the board and wired to the board with tiny wires. > > -- rec -- > > http://learn.adafruit.com/character-lcds/overview > > http://www.freaklabs.org/index.php/Blog/MIT-Media-Lab-Shenzhen-2013/MIT-Media-Lab-Shenzhen-2013-01-22-Chip-on-Board-Bare-Die-Attachment.html > > freaklabs.org is off-line at the moment, but that looks like the right > posting. Lady Ada's tutorial gets to the 8/4 bit bus after several pages > of prelims. > > > > On Tue, Feb 5, 2013 at 11:31 AM, Douglas Roberts <[email protected]>wrote: > >> You see, this is the kind of material that keeps me on FRIAM. >> >> --Doug >> >> >> On Tue, Feb 5, 2013 at 11:29 AM, Roger Critchlow <[email protected]> wrote: >> >>> The interface to the bog standard LCD display can use either 8 or 4 bits >>> parallel, which only changes the number of outs you need to do to fill the >>> line buffer, which has an 8 bit byte for each character The 8 bit >>> character ROM often has fascinating character sets in the high half >>> depending on where the surplus came from. >>> >>> -- rec -- >>> >>> >>> On Tue, Feb 5, 2013 at 11:16 AM, Steve Smith <[email protected]> wrote: >>> >>>> Sarbajit - >>>> >>>> Can you elaborate? I think this one just flew past me... 2 lines of >>>> 16 characters with only 4 bit indexing (alphabet of 16 characters?)... >>>> This sounds like (much) more than a digital watch (do those even exist >>>> anymore?) or even a calculator (only 1 line?). >>>> >>>> I feel like you handed us a riddle like the sphynx! >>>> >>>> I tried a massive, brooding, indifferent posture to Dougs posts on >>>> this one, but I could only hold the pose for a few seconds before breaking >>>> into a belly laugh appropriate only for the Buddha or Santa Claus. >>>> >>>> - Steve >>>> >>>> Just to update fellow FRIAMers. >>>> >>>> The most common standard display device in the world today is the 16x2 >>>> character LCD display. The vast majority of installations use it in 4 bit >>>> mode. >>>> >>>> On Tue, Feb 5, 2013 at 12:08 AM, Douglas Roberts <[email protected] >>>> > wrote: >>>> >>>>> As a courtesy to our old-fashioned (to put it politely) FRIAM list >>>>> members who are still reading email on their TRS-80 ascii terminals, I >>>>> will >>>>> supply a synopses of the material contained in that new-fangled url >>>>> thingie >>>>> below: the article discusses a massive, indifferent, brooding silence. >>>>> >>>>> You're welcome. >>>>> >>>>> >>>> >>>> >>>> ============================================================ >>>> FRIAM Applied Complexity Group listserv >>>> Meets Fridays 9a-11:30 at cafe at St. John's College >>>> to unsubscribe http://redfish.com/mailman/listinfo/friam_redfish.com >>>> >>>> >>>> >>>> ============================================================ >>>> FRIAM Applied Complexity Group listserv >>>> Meets Fridays 9a-11:30 at cafe at St. John's College >>>> to unsubscribe http://redfish.com/mailman/listinfo/friam_redfish.com >>>> >>> >>> >>> ============================================================ >>> FRIAM Applied Complexity Group listserv >>> Meets Fridays 9a-11:30 at cafe at St. John's College >>> to unsubscribe http://redfish.com/mailman/listinfo/friam_redfish.com >>> >> >> >> >> -- >> *Doug Roberts >> [email protected]* >> *http://parrot-farm.net/Second-Cousins*<http://parrot-farm.net/Second-Cousins> >> * <http://parrot-farm.net/Second-Cousins> >> 505-455-7333 - Office >> 505-672-8213 - Mobile* >> >> ============================================================ >> FRIAM Applied Complexity Group listserv >> Meets Fridays 9a-11:30 at cafe at St. John's College >> to unsubscribe http://redfish.com/mailman/listinfo/friam_redfish.com >> > > > ============================================================ > FRIAM Applied Complexity Group listserv > Meets Fridays 9a-11:30 at cafe at St. John's College > to unsubscribe http://redfish.com/mailman/listinfo/friam_redfish.com >
============================================================ FRIAM Applied Complexity Group listserv Meets Fridays 9a-11:30 at cafe at St. John's College to unsubscribe http://redfish.com/mailman/listinfo/friam_redfish.com
