| 摘要 |
A liquid crystal display (1, 28, 31) installed in a work vehicle comprises a luminance adjusting section (10) for manually adjusting the luminance of a backlight (6) of a liquid crystal panel (5), setting means (20, 30, 33) for setting the range of the luminance adjustable by the luminance adjusting section(10), and measuring means (21) for measuring the total operating time of the work vehicle. The setting means (20,30, 33) has a first storage section (22) for storing the luminance adjustable range for each predetermined operating time of the backlight (6), reads the luminance adjustable range corresponding to the substantial operating time which is the total operating time measured by the measuring means (21), and sets the read adjustable range as the luminance adjustable range adjustable by the luminance adjusting section (10). With this, the operator can arbitrarily adjust the luminance of the backlight, setting an excessively high luminance by the operator is prevented, and degradation of the image quality attributed to the degradation with time of the backlight is prevented.
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