Provided are a screen frame and a laser projection display device. The screen frame includes a plurality of side frames that are connected end to end, where a joint of each two of the plurality of side frames is provided with at least two connectors and receiving grooves corresponding to the at least two connectors in a one to one manner, and the at least two connectors have inserting portions extendable into the receiving grooves, at least one inserting portion of the inserting portions is provided with a telescopic engaging member, and a side wall of a receiving groove which is corresponding to an inserting portion having the engaging member is provided with a receiving hole corresponding to the engaging member; the engaging member is configured to extend into the receiving hole for positioning; and the inserting portions are connected to side walls of the receiving grooves by fasteners.

Provided are a screen frame and a laser projection display device. The screen frame includes a plurality of side frames that are connected end to end, where a joint of each two of the plurality of side frames is provided with at least two connectors and receiving grooves corresponding to the at least two connectors in a one to one manner, and the at least two connectors have inserting portions extendable into the receiving grooves, at least one inserting portion of the inserting portions is provided with a telescopic engaging member, and a side wall of a receiving groove which is corresponding to an inserting portion having the engaging member is provided with a receiving hole corresponding to the engaging member; the engaging member is configured to extend into the receiving hole for positioning; and the inserting portions are connected to side walls of the receiving grooves by fasteners.

In an aspect, a method of projecting an image using an electronic device having a front face with a display screen, a rear face, and an edge, and further including an LED on a rear face, a processor and memory, and having an application stored in the memory, the method comprising: providing a projector having an aperture therethrough, and a clip including a first arm which has an arm marker, and a second arm; executing the application so as to display a screen marker in a position based on a make and model of the electronic device; and positioning the clip on the electronic device with the first arm on the front face with the arm marker aligned with the screen marker, positioning the projector's aperture aligned with the LED to pass light through a slide containing an image, to project the image.

In an aspect, a method of projecting an image using an electronic device having a front face with a display screen, a rear face, and an edge, and further including an LED on a rear face, a processor and memory, and having an application stored in the memory, the method comprising: providing a projector having an aperture therethrough, and a clip including a first arm which has an arm marker, and a second arm; executing the application so as to display a screen marker in a position based on a make and model of the electronic device; and positioning the clip on the electronic device with the first arm on the front face with the arm marker aligned with the screen marker, positioning the projector's aperture aligned with the LED to pass light through a slide containing an image, to project the image.

An image projection device is disclosed having a body defining an aperture that includes a slide frame receiving slot that is transverse to the aperture and a magnifying lens positioned in alignment with the aperture at the front of the body. The image projection device can be attached to a mobile device and uses the camera flash of the mobile device to provide the light source to illuminate a slide transparency. The mobile device can identify a particular slide transparency through information encoded on the slide frame in order to coordinate audio or video output with the projected slide.

An image projection device is disclosed having a body defining an aperture that includes a slide frame receiving slot that is transverse to the aperture and a magnifying lens positioned in alignment with the aperture at the front of the body. The image projection device can be attached to a mobile device and uses the camera flash of the mobile device to provide the light source to illuminate a slide transparency. The mobile device can identify a particular slide transparency through information encoded on the slide frame in order to coordinate audio or video output with the projected slide.

In an aspect, a method of projecting an image using an electronic device having a front face with a display screen, a rear face, and an edge, and further including an LED on a rear face, a processor and memory, and having an application stored in the memory, the method comprising: providing a projector having an aperture therethrough, and a clip including a first arm which has an arm marker, and a second arm; executing the application so as to display a screen marker in a position based on a make and model of the electronic device; and positioning the clip on the electronic device with the first arm on the front face with the arm marker aligned with the screen marker, positioning the projector's aperture aligned with the LED to pass light through a slide containing an image, to project the image.

In an aspect, a method of projecting an image using an electronic device having a front face with a display screen, a rear face, and an edge, and further including an LED on a rear face, a processor and memory, and having an application stored in the memory, the method comprising: providing a projector having an aperture therethrough, and a clip including a first arm which has an arm marker, and a second arm; executing the application so as to display a screen marker in a position based on a make and model of the electronic device; and positioning the clip on the electronic device with the first arm on the front face with the arm marker aligned with the screen marker, positioning the projector's aperture aligned with the LED to pass light through a slide containing an image, to project the image.

A handheld projector for visually defining an event zone on a grid mat of a tabletop game to obviate the need to manually make proximity calculations during game play to determine whether players indicated on a game board are located in sufficient proximity to a virtual event to be effected.

In an aspect, a device-and-clip system is provided for an electronic device. The system includes an external device that cooperates with at least one electronic device feature on the rear face to perform a selected function. The system includes a clip including a first clip arm having an arm marker thereon and which is engageable with the front face of the electronic device and a second clip arm that is engageable with the rear face of the electronic device. The system further includes an application that is executable to instruct the electronic device to display a screen marker on the display screen in a selected position and in a selected orientation such that positioning and orienting of the first clip arm on the display screen of the smart phone with the arm marker aligned with the position and orientation of the screen marker positions the external device in alignment with the at least one electronic device feature.