Importance

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Abstract

The invention provides a display state detection method which allows the display state of an information display apparatus to be supervised accurately without giving any obstacle to a user, a display state adjustment method and a maintenance management method by which the display state can be kept good as well as an information display apparatus. Optical sensors are disposed on the rear face side of a plasma display panel and catch rear face side outgoing light, which increases in proportion to the outgoing light amount to the display face side of the plasma display panel, to detect a panel display state, and the display state of the plasma display panel is automatically adjusted based on a result of the detection. When adjustment is impossible, the apparatus itself outputs an alarm and accumulates an adjustment history and/or a failure history. The presence of the optical sensors does not make an obstacle when the display screen is observed, and there is no need to effect operation to arrange an optical sensor and connect it to an adjustment equipment for exclusive use each time adjustment is to be performed. Since the display state of the plasma display panel is detected directly by the optical sensors, the accuracy in detection is high.

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First Claim