Patent ID: 7053871
Filing Date: 2006-05-30
Classification: G09G

Abstract:
1. A display apparatus comprising: a shutter of which light transmittance is changeable; a gas discharge tube for lightening the shutter; a shutter controller for controlling the light transmittance of the shutter on the basis of luminance information about an image to be displayed; and a discharge controller for controlling a discharge state of the gas discharge tube in accordance with a light transmittance state acquired when the shutter controls the light transmittance responsively to the luminance information; wherein the discharge controller includes: a field detector configured to detect a period of each field from the image to be displayed; a lighting period controller configured to control the period of each field so that the period of each field is divided in sequence into a luminescence-rest period during which the gas discharge tube is subjected to either one of a reduction of an intensity of light emitting therefrom and a rest of the luminescence thereof in cases where the light transmittance state of the shutter is out of a desired light transmittance range, a luminescence-preparing period during which the luminescence of the gas discharge tube is prepared, and a luminescence period during which the gas discharge tube performs the luminescence; and an applied-voltage generator configured to generate a voltage signal to be supplied to the gas discharge tube, the voltage signal being formed depending on a difference among the luminescence-rest, luminescence-preparing, and luminescence periods.