Light source lamps emerged when we removed optical sheets.
Light source lamps emerged when we removed optical sheets.
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Nikkei Electronics Breakdown Team started analyzing the ultrathin backlight unit. After observing the optical sheets, we looked into the light source.

The thickness of an LCD panel greatly depends on what light source and what locating method are employed. Hitachi explained it had employed an EEFL (external electrode fluorescent lamp), a kind of fluorescent tube, for the light source and used the "direct method," which locates the lamps behind the panel.

That gave us a hint. We thought we would surely find multiple lamps (EEFLs) under the optical sheets. To confirm it with our own eyes, we removed the four sheets and the diffuser panel. It certainly was the direct method. There was an array of slim lamps beneath the display.

"What? Nineteen?" cried an engineer, breaking the silence of the Breakdown Team, which was impressed that the sight was exactly as expected.

Apparently, 19 lamps were used in it. We heard most 32-inch LCD TVs use 10 to 14 lamps. Is the engineer being amazed at the larger number of lamps in there? To reduce the thickness of a backlight unit, however, it is a sure formula to increase the number of lamps.

The engineer continued, "An odd number of lamps is rare."

I see. He was surprised that the odd number of lamps was used.

The engineer began to guess why Hitachi had chosen to use the odd number of lamps.