| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and a circuit for controlling backlight, that relies only on signals associated and synchronized with video signals. SOLUTION: In a display device an image is reproduced by controlling the luminous energy supplied by a light source by means of light modulators for individual pixels. Subsequent images are synchronized to each other by synchronizing signals (VB) regularly occurring at intervals corresponding to first time periods. A backlight is controlled to emit light during fractions of second time periods or whole second time periods which are equal to or shorter than the first time periods. A plurality of second time periods may be nested and evenly distributed within the first time period. The signals for driving the backlight are preferably generated in synchronism with the horizontal pixel clock. Each of the fractions of second time periods or the whole second time periods during which light is emitted is divided into a number of elementary stages, wherein each elementary stage corresponds to a number of pixel clock periods. The number of elementary stages is chosen according to the desired ratio of control of the backlight. COPYRIGHT: (C)2008,JPO&INPIT
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