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high temperature polysilicon (LCD) (HTPS)

High-temperature polysilicon (HTPS) is a semiconductor technology produced at temperatures of 1,000 °C. It can be used to manufacture tiny structures for TFT displays as active matrices. It can be used to produce the smallest structures for TFT displays as active matrices. This technology is also used for high- resolution transmitted- light LCD panels for large-screen projection.

Projectors in high-temperature polysilicon technology are usually constructed as LCD projectors with 3-TFT panels and have a resolution equivalent to full HD, i.e., of 1,920 x 1,080 (1,080p) pixels. The 3LCD technology uses three LCD panels with a diagonal of 0.7 inches. At a resolution of 1,920 x 1,080 pixels, this means a pixel pitch of about 8 micrometers (µm).

Structure of an HTPS LCD projector

Structure of an HTPS LCD projector

Technically, HTPS projectors use dichroic filters to split the light produced by a projector lamp into the colorsred, green and blue. These light beams are used to illuminate the three LCD panels on which the RGB color separations are displayed. The three color beams are then combined via a prism to form image information and projected onto the projection screen.

HTPS LCD projector from Sony

HTPS LCD projector from Sony

HTPS projectors are characterized by high luminous efficacy because they have a favorable pixel-to- conductor ratio. In addition, they require relatively low projection power and have a high contrast of over 500:1. Depending on the driver, they can resolve several billion colors.

Informations:
Englisch: high temperature polysilicon (LCD) - HTPS
Updated at: 16.11.2008
#Words: 217
Links: semiconductor, thin film transistor (TFT), active, resolution, light
Translations: DE
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