Abstract: A cold cathode discharge tube is disposed as a light source on the front side of a display unit, and a grounded connector is disposed on and/or in the neighborhood of the outer periphery of the cold cathode discharge tube. The conductor causes electric noise generated from the cold cathode discharge tube to flow to the ground, thus preventing the rupture and erroneous operations of the liquid crystal display unit accommodating driving ICs.

Abstract: A pulse counting device wherein a number of pulses is stored in a first register out of a plurality of registers, and subsequently a new pulse number counted is stored in the first register and pulse numbers stored in the registers are successively shifted with a pulse number erased from a final register. The pulse numbers stored in the respective registers are corrected dependent on the latest pulse number stored in the first register, and a value dependent on the corrected values stored in all of the registers is displayed. If the latest pulse number is abruptly varied in excess of a certain preset value upon comparison with the pulse numbers in the registers, then the pulse numbers in the registers are corrected with a value dependent on the latest pulse number.