Liquid crystal display having an improved lighting device
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United States of America Patent
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Oct 21, 2003
Grant Date -
Mar 28, 2002
app pub date -
Aug 23, 2001
filing date -
Oct 12, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
A liquid crystal display device includes a liquid crystal display panel and a lighting device. The lighting device is supplied with alternately a first current during a period t.sub.1 and a second current during a second period t.sub.2 such that electric power E1 is lower than electric power E2. E1 is defined as (t.sub.1.times.i.sub.p-p (1).times.V.sub.p-p (1))/2+(t.sub.2.times.i.sub.p-p (2).times.V.sub.p-p (2))/2, where i.sub.p-p (1)=a peak-to-peak value of the first current, V.sub.p-p (1)=a peak-to-peak value of a voltage across the light source during the period t1, i.sub.p-p (2)=a peak-to-peak value of the second current, and V.sub.p-p (2)=a peak-to-peak value of a voltage across the light source during the period t.sub.2. E2 is defined as (t.sub.1 +t.sub.2).times.I.sub.eff.times.V.sub.eff, where I.sub.eff and V.sub.eff are effective values of the current and voltage of the light source, respectively.
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