How do I rotate the display by 90° or 180°?

The Orientation page explains the changes required to rotate the display contents. Note: This only applies to G2C1 modules, not G2H2 modules.

How do I rotate the display by 90° or 180°?2019-12-04T08:40:03-08:00

Touch Calibration Questions

How can I re-calibrate the touch screen? You can force a re-calibration by removing the file /etc/pointercal and then rebooting the module. The calibration is then run during the module startup. It creates the file /etc/pointercal, and if this file exists at startup, the calibration step is not run. You can also do a calibration manually by running these commands from the console (Advanced View in G2Link): /etc/init.d/qml-viewer stop ts_calibrate /etc/init.d/qml-viewer start Do I need to give the end-user of my equipment the option to re-calibrate the touch screen? In the case of Projected Capacitance (glass front, PCAP) touch, the answer is generally no. Projected Capacitance touch works by energizing and sensing patterned rows and columns of lines in the touch panel. Calibration provides a correspondence between a location on the LCD and the touch’s sensed location. This won’t change over time, so one calibration should be sufficient. There could be a rare case such as where the calibration [...]

Touch Calibration Questions2019-10-29T08:29:14-07:00

Do the modules run a display server such as X11 or Wayland? Is there support for OpenGL?

G2H2 modules, with Qt 5.3.2, use Qt’s EGLFS platform, which takes advantage of the GPU and hardware acceleration. Qt manages the the frame buffer. We are not running a display server, X11 or Wayland. G2C1 modules, which have no GPU, with Qt 4.8, use QWS to manage the frame buffer. Again, there is no display server such as X11 or Wayland.

Do the modules run a display server such as X11 or Wayland? Is there support for OpenGL?2019-11-14T13:15:35-08:00

Can you provide MTBF values?

We don’t have actual MTBF calculations for our display modules. However, the gating item will always be the LCD panel backlight. For example, the panel used in the 4.3″ modules has an LED lifetime minimum rating of 20,000 hours (typical 30,000 hours). LED lifetime is defined as operating hours at full brightness until the module brightness decreases to 50% of the original intensity when operated at an ambient temperature of 25ºC. This is not as bad as it might seem. Our eyes have a logarithmic response to brightness, so half-bright to a luminosity meter is not perceived as half-bright. Note: The LED lifetime can be increased by reducing the display brightness or turning the backlight off during periods of inactivity. For example, to double the LED lifetime rating, reduce the backlight brightness to 50%.

Can you provide MTBF values?2022-04-08T10:52:42-07:00

Is there an inexpensive screen protector I can use for my display?

Check out screen protector vendors below. The size you need will depend on your bezel design and visible display area. Photodon Find Universal Stock sizes. Photodon can also trim down films to your dimensions for a custom fit. See a description of all film types: clear, anti-glare, and specialty. NuShield For the SLCD43 module, check out Part Number NU300E, Select DayVue film. Read more about DayVue's anti-reflective film for electronic displays. ARMR-200 This product by 3M is another option. It is an anti-reflective, matte, 5mil protector. Digi-Key sells sheets of it, and then you need to employ a die-cut company to slice it to the correct size. In a typical application, cut it to the visible screen size so you can replace it easily. If you are trying to seal the screen, cut it to the size of the display and mount it behind a gasket.

Is there an inexpensive screen protector I can use for my display?2022-04-08T10:54:00-07:00

Will resistive touch screens work with latex gloves?

Some people believe you need a  projected capacitive touch screen for latex gloves. However, resistive touchscreens work under pressure, so gloves, stylus, or anything that pushes the touch screen will work.

Will resistive touch screens work with latex gloves?2022-04-08T10:55:00-07:00

Can I change from a landscape to portrait-orientation?

Under "Touchscreen Display Modules" choose the product you are using. Under the "Downloads" tab, select Portrait Firmware to download the .UPG file. Use the BMPload program to change the firmware. Note: SLCD5/SLCD5+ products display landscape orientation only and cannot do portrait orientation.

Can I change from a landscape to portrait-orientation?2022-04-08T10:55:36-07:00

Why is the resolution of the 5.7″ display worse than that of the 4.3″ display? Do you have a 5.7″ display that has a resolution as good as or better than the 4.3″?

The 5.7″ QVGA (320×240) is an older standard than the 4.3″ display, and that’s why the 5.7″ has a lower resolution. The lower the resolution, the higher the brightness, so the 5.7″ does have one redeeming feature. We favor “standard” sizes and resolutions as much as possible for long-life availability. There are no standard bodies for small TFT displays, only form factors and resolutions adopted by multiple vendors. You have several options for higher resolution, and these are all powered by our SLCD5 controller. These options are very similar in resolution (dots per inch (dpi) or pixel pitch). Reference 4.3″ dot pitch 0.198mm = 128dpi Options: 5.7″ VGA (640×480) dot pitch 0.180mm = 141dpi (tighter than the 4.3″) 6.4″ VGA (640×480) dot pitch 0.204mm = 124dpi 7″ WVGA (800×480) dot pitch 0.190mm = 134dpi All of the above are available from multiple panel vendors.

Why is the resolution of the 5.7″ display worse than that of the 4.3″ display? Do you have a 5.7″ display that has a resolution as good as or better than the 4.3″?2022-04-08T10:56:34-07:00
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