Abstract: An exemplary display module includes a panel and an identification circuit including at least two resistors. The identification circuit is disposed on the panel.

Abstract: An exemplary liquid crystal display device (20) includes a liquid crystal display panel (200), a flexible printed circuit (270) and a driving chip (210). The flexible printed circuit includes a conductive line (273). The driving chip includes an interface circuit (230) and an analog-to-digital circuit (260), the analog-to-digital circuit is configured for receiving an analog operating mode signal via the conductive line and transforming the analog operating mode signal to a digital operating mode signal, and providing the digital operating mode signal to the interface circuit. The digital operating mode signal determines an operating mode of the liquid crystal display device.

Abstract: An exemplary touch panel (2) includes a first input layer (21) having an output terminal, and a second input layer (22) parallel to the first input layer. The second input layer includes a first electrical set, a second electrical set, a mesh circuit, and a switch circuit. The first electrical set includes a first electrical node (241), a second electrical node (242), a third electrical node (243), and a fourth electrical node (244), the first, second, third, and fourth electrical nodes respectively located at four vertexes of an imaginary rectangle on the second input layer. The mesh circuit having a plurality of resistors (238) connected between the four electrical nodes. The second electrical set includes a first input terminal and a second input terminal. The switch circuit electrically connected between the first electrical set and the second electrical set. The configuration of the touch panel (2) is simplified.