Abstract: An electronic device such as a voice-controlled speaker device may have a cylindrical shape with upper and lower ends that have surface regions of compound curvature. The electronic device may have a display formed form an array of light-emitting devices such as light-emitting diodes. To provide the display with desired curvature (such as compound curvature), the display may be thermoformed. A flexible substrate for the display may be attached to a separate thermoplastic substrate. During a thermoforming process, the display may be heated such that the thermoplastic substrate softens into a pliable state. The display may then be molded into a desired shape. The display is then cooled to harden the thermoplastic substrate and secure the flexible substrate and light-emitting diodes in the desired shape. The thermoformed display may be stacked with additional functional layers such as a thermoformed touch-sensitive layer and/or a thermoformed lens layer.