Alexa.Display 1.0

The Alexa.Display interface is one of the APIs available for the Alexa Presentation Language (APL). Alexa.Display represents the physical properties of two-dimensional video display devices, such as LCD and LED displays.

Publish your Alexa.Display characteristics to the Alexa cloud upon device startup. The visual characteristics specified by the interface describe the static hardware specifications and physical dimensions of the device, which do not change.

To learn more about APL, its interfaces, and how to use those interfaces together, see Alexa Presentation Language (APL) Overview.

• Capability assertion
• Object syntax
• Configuration parameters

Capability assertion

Alexa.Display 1.0 may be implemented by the device on its own behalf, but not on behalf of any connected endpoints.

New AVS integrations must assert support through Alexa.Discovery, but Alexa will continue to support existing integrations using the Capabilities API.

Sample Declaration

{
    "type": "AlexaInterface",
    "interface": "Alexa.Display",
    "version": "1.0"
}

Object syntax

The following code snippet shows the parameters, valid values, and types for the Alexa.Display interface:

{
    "type": "AlexaInterface",
    "interface": "Alexa.Display",
    "version": "1.0",
    "configurations" : {
        "display" : {
            {
                "type" : "PIXEL",
                "touch" : [ "SINGLE", "UNSUPPORTED" ],
                "shape": [ "RECTANGLE", "ROUND" ],
                "dimensions" : {
                    "resolution": {
                        "unit" : "PIXEL",
                        "value" : {
                            "width": {{INTEGER}},
                            "height": {{INTEGER}},
                        }
                    },
                    "pixelDensity" : {
                        "unit" : "DPI",
                        "value" : {{INTEGER}}
                    },
                    "densityIndependentResolution" : {
                        "unit" : "DP",
                        "value" : {
                            "width" : {{INTEGER}},
                            "height": {{INTEGER}}
                        }
                    },
                    "physicalSize" : {
                        "unit" : [ "CENTIMETERS" | "INCHES" ],
                        "value" : {
                            "width" : {{DECIMAL}},
                            "height": {{DECIMAL}}
                        }
                    }
                }
            }
        }
    }
}

Configuration parameters

The following table lists the parameters, valid values, and types for the Alexa.Display interface. Because these properties are applicable to the physical device display, they only change when the physical display itself is changed, such as connecting a new display. These properties do not change with screen rotation or other dynamic adjustments.

Field	Type	Required	Description
type	String	Yes	Type of display. Valid value is "PIXEL". Represents pixel-based displays, such as televisions, monitors, etc.
touch	Array of strings	Yes	Collection of supported levels for touch input. Valid value is "SINGLE": Touch input through one point of contact. An empty array indicates no touch support for a device.
shape	String	Yes	Shape of the device. Valid values are "RECTANGLE" and "ROUND". For a ROUND device, the dimensions represent the rectangle containing the round shape.
dimensions	Object	Yes	Applicable dimensions of the device.
dimensions.resolution	Object	For PIXEL type.	Resolution of the display.
dimensions.resolution.unit	String	For PIXEL type.	Resolution unit of the display. Valid value is "PIXEL".
dimensions.resolution.value	Object	For PIXEL type.	Resolution value of the display.
dimensions.resolution.value.width	Integer	For PIXEL type.	Width of the display in pixels.
dimensions.resolution.value.height	Integer	For PIXEL type	Height of the display in pixels.
densityIndependentResolution	Object	For PIXEL type.	Screen width and height of the device in DP units as reported by the display.
densityIndependentResolution. unit	String	For PIXEL type.	DP unit of the display. Accepted value is "DP".
densityIndependentResolution. value	Object	For PIXEL type.	DP size of the display.
densityIndependentResolution. value.width	Integer	For PIXEL type.	Width of the display in pixels.
densityIndependentResolution. value.height	Integer	For PIXEL type	Height of the display in pixels.
pixelDensity	Object	For PIXEL type.	The dots-per inch (DPI) as reported by the display. DPI should be one of the following values: 120, 160, 213, 240, 320, 480, 640. If the device does not directly map to one of these values, choose the closest value to the reported value.
pixelDensity.unit	String	For PIXEL type.	Pixel density unit for the device. Accepted value is "DPI".
pixelDensity.value	Integer	For PIXEL type.	DPI value of the display.
physicalSize	Object	Yes	Physical size of the display.
physicalSize.unit	String	Yes	Unit of measurement for the resolution of the display. Accepted values are "CENTIMETERS" and "INCHES".
physicalSize.value	Object	Yes	Physical size value of the display.
physicalSize.value.width	Float	Yes	Width of the display defined in expressed units.
physicalSize.value.height	Float	Yes	Height of the display defined in expressed units.