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Browse Prior Art Database

Method for Displaying Half Tone Image

IP.com Disclosure Number: IPCOM000034295D
Original Publication Date: 1989-Jan-01
Included in the Prior Art Database: 2005-Jan-27
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Hayashi, Y: AUTHOR [+3]

Abstract

Disclosed is a method for displaying a half tone image on a liquid crystal display (LCD) device by selectively supplying a video input signal to the LCD device. As shown in a drawing, a period of vertical synchronous pulses (V SYNC) applied to the control display operations of the LCD device is divided into the plural sub-periods, e.g., Tl through T5 and T6 through T10. During the first V SYNC period, the video input signal is supplied to the LCD device during the sub-periods T1, T3 and T5, and the driving voltage of positive polarity is applied. During the second V SYNC period, the video input signal is supplied to the LCD device during the sub-period T7 and T9, and the driving voltage of negative polarity is applied.

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Method for Displaying Half Tone Image

Disclosed is a method for displaying a half tone image on a liquid crystal display (LCD) device by selectively supplying a video input signal to the LCD device. As shown in a drawing, a period of vertical synchronous pulses (V SYNC) applied to the control display operations of the LCD device is divided into the plural sub- periods, e.g., Tl through T5 and T6 through T10. During the first V SYNC period, the video input signal is supplied to the LCD device during the sub-periods T1, T3 and T5, and the driving voltage of positive polarity is applied. During the second V SYNC period, the video input signal is supplied to the LCD device during the sub-period T7 and T9, and the driving voltage of negative polarity is applied. The half tone image is displayed without flicker or jitter of the image and a degradation of the liquid crystal.

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