On Tue, 2 Feb 2010 06:33:35 +0800 Jaya Kumar <jayakumar.lkml@xxxxxxxxx> wrote: > You are right, broadsheet is a framebuffer device. It is slightly > different than a typical framebuffer controller that drives a normal > TFT-LCD display. Most E-Ink display panels require a waveform in order > to function. That is, in order to drive the state of a pixel to black, > gray, or white, a specific waveform is utilized. Basically, that > waveform represents the specific E-field wiggling needed to get the > pixel to its optimal state given current temperature, and its previous > state. TN/IPS-LCDs use a similar concept but the driving waveform is > sufficiently simple that it is internalized in the TFT source/gate > driver. > > These E-Ink waveforms are specific to a production batch. That is, a > batch of display films are produced, then they get characterized and a > waveform is generated for that batch. Broadsheet, typically, is > attached to its private SPI flash which is then flashed with this > waveform. > > Users won't be able to see the waveform and typically won't ever need > to know about it. If however, the display panel attached to broadsheet > is changed out, then they will need to update their waveform. That > would typically be done at a factory or repair facility rather than by > a user. ah, I'd never have guessed, thanks. I added that to the changelog ;) -- To unsubscribe from this list: send the line "unsubscribe linux-fbdev" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
