Changes between Version 17 and Version 18 of ventana/LVDS


Ignore:
Timestamp:
09/23/2021 05:38:44 PM (3 years ago)
Author:
Tim Harvey
Comment:

added backlight section

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  • ventana/LVDS

    v17 v18  
    111111
    112112[=#touchcontroller]
    113 == Touchscreen sensors ==
    114 Touchscreen's are displays that have bonded to them a thin glass sensor to detect touch events. These can have a variety of features and technologies:
     113== Touchscreen sensors
     114Touchscreen's are displays that have bonded to them a thin transparent sensor layer to detect touch events. These can have a variety of features and technologies:
    115115 * resistive touch vs capacitive (each has their pro's and con's)
    116116 * communication channels (I2C vs USB typically) - the Ventana LVDS connector itself supports an i2c channel although USB can be picked up from the main-board on different connectors
    … …  
    118118 * other features...
    119119
    120 There is a large variety of touch sensor controllers (the chip) and touch sensor's (the glass with the micro-wires or elements that connect to the controller chip). Each controller chip has a certain number of sensor circuits that can limit the size of the display.
     120There is a large variety of touch sensor controllers (the chip) and touch sensor's (the layer with the micro-wires or elements that connect to the controller chip). Each controller chip has a certain number of sensor circuits that can limit the size of the display.
     121
     122Various controller drivers are available for Linux for USB and I2C busses which register events through the Linux Input API.
    121123
    122124The panels that we offer 'out-of-the-box' support for listed below use one of the following controller chips:
    123  * eGalax (used on the Freescale MCIMX-LVDS1 10" XGA Touchscreen Display)
    124125 * !FocalTech FT5x06 (used on the DLC700JMGT4 7" WSVGA Touchscreen Display)
    125126 * Goodix GT9110 (used on the DLC800FIGT3 8" XGA Touchscreen Display)
     127 * eGalax (used on the Freescale MCIMX-LVDS1 10" XGA Touchscreen Display)
     128
     129
     130[=#backlight]
     131== Backlight Controllers
     132Touchscreens typically have a backlight behind the display element to illuminate the display. These can be LED strips or other technology that have varied electrical needs. A Backlight controller is an integrated circuit or simple circuit typically interfacing to either an existing pulse width modulated (PWM) signal to vary brightness, a simple GPIO controlled on/off control, or a more complex circuit configured over a bus such as I2C.
     133
     134The panels that we offer 'out-of-the-box' support for all have an integrated backlight controller on-board that is controlled via a PWM signal from the processor.
    126135
    127136