| 摘要 |
An aspect display unit is provided to enable a driver to perceive speed of a running train more correctly. An aspect display unit for displaying speed of a train, comprises a speed display unit(200), a display driving unit(150), and a control unit(140). The speed display unit includes an objective speed displayer and a present speed displayer and displays those speeds according to a round analog system. The display driving unit is input with a function selection signal and outputs a chip select signal for selecting between the two displayers. The control unit determines whether the speed to be displayed is the objective speed or the present speed to accordingly output the function selection signal. The present speed displayer comprises a first decoder unit(211) and a plurality of first LED units(211a). The objective speed display unit comprises a second decoder unit(221), and a plurality of second LED units(221a).
|
