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Calibration method of LCD Yakitsuki by Refresh rate change

IP.com Disclosure Number: IPCOM000016432D
Original Publication Date: 2003-Jan-10
Included in the Prior Art Database: 2003-Jun-21
Document File: 2 page(s) / 67K

Publishing Venue

IBM

Abstract

Disclosed is a calibration method to prevent Yakitsuki of LCD by returning to default-refresh-rate-driven from slow-refresh-rate-driven with maximum low-power-mode usage.

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Calibration method of LCD Yakitsuki by Refresh rate change

Disclosed is a calibration method to prevent Yakitsuki of a LCD by returning to default-refresh-rate-driven from slow-refresh- rate-driven which is used for low-power-mode,by using the LCD which is guaranteed that No Yakitsuke appeared with slow-refresh-driven-during 10hours( or so). At the same time, this mehtod is also meet 10hours ( or so) which is the specificayion of the system-battery-rundown by
using slow-refresh-driven low power mode. The scheme of this method is referred to Fig.1 Flow chart of this method. Generally one pixel of LCD is +/- AC is driven with almost HSYNC duration at one HSYNC timing per every Frame, based on default 60Hz refresh rate. In order to prevent Yakitsuki, all pixels of LCD in System are electrically balanced by an adjusted Vcom(common voltage of +/- AC driven) and +/- AC driven based on default 60Hz refresh rate. However, in order to get Low-power slow refresh rate ( 50Hz or less ) as well as to prevent Yakitsuki, this method scheme is follows. At 1st, a LCD is being +/- AC driven with slow reflesh rate ( 50Hz or less ) until maximum No Yakitsuki guaranteed time( 10 hours or so ) as Low-power-mode, and at 2nd if the LCD is being +/- AC driven with slow refresh rate for maximum No Yakitsuki guaranteed time or more, then automatically the LCD becomes +/- AC driven with default 60Hz refresh rate to get calibration and to prevent Yakitsuki of the LCD.

Fig.1 Flow-chart of Cali...