| 摘要 |
<p>A display unit (10) comprises signal processing means (2), selectively operable light emitting means (3, 32) and light directing means (4) which co-operate with the light emitting means. The unit incorporates or uses a scale (7, 34) and the light directing means is in the form of a refractive lens (30). In use, the unit is powered and connected to an input signal source (5) which supplies an input signal. The processing means analyses the input signal and selectively activates the light emitting means which may be a multiplicity of LEDs (32). Light produced by the light emitting means interacts with the light directing means to produce at least one discrete beam. The positioning of the beam in relation to the scale corresponds to the input signal. The scale may have a legend which is programmable.</p> |
