Method and apparatus for checking the functions of a display system
AssigneePfister GmbH
InventorReiner Lewandowski
Life of this patent
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Abstract
A method and apparatus for checking the functions of a display system display data which is received from a processing unit, store the displayed data, and check the stored data for identity with the data which is to be received and displayed. The check determines not only whether the display system has properly received the data, but also checks for malfunctions in the display system itself, such as a short circuit or an open circuit within the display unit, because the stored data can only correspond to the data intended for display when no malfunctions have occurred in either the display system or in the circuit for receiving the data.
Claims15
A method for verifying the correct display of data transmitted from a data processor to a display unit comprising the steps of:
- receiving, by the display unit, a data word consisting of a predetermined number of digits coded in a processor code;
- storing the individual digits of the processor code;
- converting the stored individual digits of the data word from the processor code into a display code;
- selectively energizing display elements for each individual digit in accordance with the display code;
- determining the display elements selectively energized in order to recover the individual digits in the display code;
- converting the individual digits from the display code into the processor code;
- and
- storing the digits in the processor code and retransmitting the digits to the processor for checking the retransmitted digits with the digits transmitted to the display unit.
A display unit to receive and display data transmitted as a data word, including a plurality of digits, from a processor, comprising:
- first conversion means for converting the digits of a data word received from the processor in a processor code into a display code;
- a plurality of display elements;
- first storage means connected to said first conversion means for storing the digits of the received data word in the processor code;
- energizing means connected to said first storage means for selectively energizing display elements for each digit of the data word;
- sensing means connected to said display elements for determining selectively energized elements for each digit;
- second conversion means connected to said sensing means for converting digits from the display code into the processor code;
- and
- second storage means connected to said second conversion means for storing digits in the processor code and for retransmitting the digits to the processor for checking the identity of a digit retransmitted to the processor with the corresponding digit transmitted to the display unit.
Dependencies are inferred from the claim text.