This article provides information on how to adjust the resolution on an Elo I-Series 4 All-In-One (AIO) touch computer.

The default resolution on the 15-inch and 22-inch I-Series 4 with Android, is 1280 x 720; however, since these devices are equipped with a FHD LCD panel, the default can be changed to 1920 x 1080dp. There are two methods of achieveing this; Changing DPI settings in Android Home or Changing DPI settings through SDK, see steps below.

Changing DPI Settings in Android Home

1. Go to Android Settings About tablet  Build Number and ensure the I-Series 4 device is running on the below Android build version or higher:

• iSeries 4 value (Rokchip): 5.6.87+v
• iSeries 4 Standard (Qualcomm): 5.000.007.0001+P

• If different from above build numbers the device needs an update from Android Settings System Advanced System Updates  - Check and update device

2. Change DPI setting from 240 to 160 in Android Settings Display Advanced Screen Density = 160 MDPI



3. Choose REBOOT NOW when prompted.


4. The device will reboot and start back up in 1920 x 1080p resolution.

• Note: This setting will remain even if a factory reset is performed.

5. Lastly, go to Android Settings Display Advanced Display size, and set the slider to "Default" 

• Below matrix indicates screen resolution based on Display Size Setting

Changing DPI settings through SDK

To change DPI settings via SDK, see below:

 


“The SDK features an API which will poll the device(s) for model name before applying the DPI settings on the device. This will allow an app to determine if the device is 2.0 or 4.0 before applying necessary changes.
 
android.os.Build.MODEL = gives model name ..  getDPI() Home SDK API returns current DPI value .. Compare and setDPI()”

DPI Settings Explained

Elo's I-Series 4 devices at 1920x1080 running at 240 density means that 1 dp = 1.5 physical pixels. This is why a 1920x1080 px at 240 DPI = 1280x720 dp. 

The formula for this is dp = (pixels * 160) / DPI.
dp is the length unit of measurement that Android UI developers use for UI elements. 

Elo's I-Series 4 Display Resolutions