A mobile telephone unit or a PDA, comprising: - data processing means (10A1, 10A2, 10B, 10B1, 10B2, 10C, 10D); - interface means (A1, A2, A3, 13A, 13B, 13C, 13D); - display means composed of a display panel and a display control means; - input means (16A, 16B) adapted to send input data, which a user may input by a manual operation, to said data processing means (10A1, 10A2, 10B, 10B1, 10B2, 10C, 10D); - wireless communication means (11, 111A, 111B, 112A, 112B, 112C, 113A, 113B, 113C, 113D) adapted to receive a wireless signal, to convert the wireless signal into a digital signal, to send the digital signal to said data processing means, to convert a digital signal, which is received from said data processing means, into a wireless signal, and to send the wireless signal; - storage means (14A, 14B) adapted to store a data file, which can be processed by said data processing means, and to store a display program, according to which said data processing means can generate a digital display signal; - said data processing means (10A1, 10A2, 10B, 10B1, 10B2, 10C, 10D) being adapted to process a digital signal, which is received from said wireless communication means (11, 111A, 111B, 112A, 112B, 112C, 113A, 113B, 113C, 113D), and/or a data file, which is read out from said storage means (14A, 14B), to generate a digital display signal according to which said display means can display an image on the screen of said display panel, to generate an external digital display signal, said external digital display signal having an intrinsic resolution which is higher than the screen's resolution of said display panel, to send said digital display signal to said display control means, and to send said external digital display signal to said interface means (A1, 13A, 13B, 13C, 13D), in accordance with input data received from said data input means, and in accordance with said display program stored in said storage means; - said display panel being adapted to display an image as a result of an activation of pixels comprising its screen; - said display control means being adapted to receive said digital display signal, and to activate each pixel of said display panel, in accordance with the digital display signal received from the data processing means (10A1, 10A2, 10B, 10B1, 10B2, 10C, 10D); and - said interface means (A1, 13A, 13B, 13C, 13D) being adapted to be connected to a peripheral device (3, 4) which includes or is connected to an external display means (5, 45A, 45B, 45C, 45D, 456), to receive the external digital display signal from the data processing means (10A1, 10A2, 10B, 10B1, 10B2, 10C, 10D), and to send the external digital display signal to said peripheral device (3, 4). - data processing means (10A1, 10A2, 10B, 10B1, 10B2, 10C, 10D); - interface means (A1, A2, A3, 13A, 13B, 13C, 13D); - display means composed of a display panel and a display control means; - input means (16A, 16B) adapted to send input data, which a user may input by a manual operation, to said data processing means (10A1, 10A2, 10B, 10B1, 10B2, 10C, 10D); - wireless communication means (11, 111A, 111B, 112A, 112B, 112C, 113A, 113B, 113C, 113D) adapted to receive a wireless signal, to convert the wireless signal into a digital signal, to send the digital signal to said data processing means, to convert a digital signal, which is received from said data processing means, into a wireless signal, and to send the wireless signal; - storage means (14A, 14B) adapted to store a data file, which can be processed by said data processing means, and to store a display program, according to which said data processing means can generate a digital display signal; - said data processing means (10A1, 10A2, 10B, 10B1, 10B2, 10C, 10D) being adapted to process a digital signal, which is received from said wireless communication means (11, 111A, 111B, 112A, 112B, 112C, 113A, 113B, 113C, 113D), and/or a data file, which is read out from said storage means (14A, 14B), to generate a digital display signal according to which said display means can display an image on the screen of said display panel, to generate an external digital display signal, said external digital display signal having an intrinsic resolution which is higher than the screen's resolution of said display panel, to send said digital display signal to said display control means, and to send said external digital display signal to said interface means (A1, 13A, 13B, 13C, 13D), in accordance with input data received from said data input means, and in accordance with said display program stored in said storage means; - said display panel being adapted to display an image as a result of an activation of pixels comprising its screen; - said display control means being adapted to receive said digital display signal, and to activate each pixel of said display panel, in accordance with the digital display signal received from the data processing means (10A1, 10A2, 10B, 10B1, 10B2, 10C, 10D); and - said interface means (A1, 13A, 13B, 13C, 13D) being adapted to be connected to a peripheral device (3, 4) which includes or is connected to an external display means (5, 45A, 45B, 45C, 45D, 456), to receive the external digital display signal from the data processing means (10A1, 10A2, 10B, 10B1, 10B2, 10C, 10D), and to send the external digital display signal to said peripheral device (3, 4).