| 摘要 |
A data input and display apparatus comprising a tablet (21) to which an information signal is inputted by designating a coordinate position, a display circuit (42a, 42b, 43) for generating a display signal in accordance with the information signal inputted from the tablet (21), a display member (22) capable of visually representing the display signal, a control circuit (46) for generating a control signal by detecting the presence of any input to the tablet (21), a light source (26) for illuminating the display member (22) from behind, a light source controller (63) for controlling the light source (26) in response to the control signal generated from the control circuit (46), a power circuit (64) for obtaining a driving voltage from a voltage source, a means (905, 914) for detecting the state of the voltage source, and a luminance control means (915) for controlling the luminance of the light source (26) in response to the output of the detecting means (905, 914). The power circuit (64) is capable of selecting either a first voltage produced by rectifying an AC power supply (17), or a second voltage obtained from a battery (19). <IMAGE> |
