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Charge Coupled Device - Liquid Crystal Device Driver with Gain Correction Circuit

IP.com Disclosure Number: IPCOM000114703D
Original Publication Date: 1995-Jan-01
Included in the Prior Art Database: 2005-Mar-29
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Mori, S: AUTHOR

Abstract

Disclosed is a device for the Liquid Crystal Display (LCD) panel's column cell driver using Charge Coupled Device (CCD) shift register. CCD transfers the analog signal instead of the digital signal that expresses the color intensity of the LCD panel. This device also has the variable gain sense amplifiers to compensate the signal level decline while the electric charge is transferred.

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Charge Coupled Device - Liquid Crystal Device Driver with Gain Correction
Circuit

      Disclosed is a device for the Liquid Crystal Display (LCD)
panel's column cell driver using Charge Coupled Device (CCD) shift
register.  CCD transfers the analog signal instead of the digital
signal that expresses the color intensity of the LCD panel.  This
device also has the variable gain sense amplifiers to compensate the
signal level decline while the electric charge is transferred.

      Fig. 1 shows the block diagram of this device circuit.  Charge
injection circuit (1) converts the signal voltage level to an amount
of the electric charge.  CCD cells for the charge shifting (2)
transfers
the input charge to each position of the sense amplifiers.  CCD cells
for the charge holding (3) holds the charge to drive the sense
amplifier.  Sense amplifier (4) converts an amount of the electric
charge to the voltage level to drive the LCD column line.  This is a
variable gain amplifier to compensate all output levels by the
voltage
applied at A and B (Fig. 2).  Gain compensation voltage circuit (5)
generates voltages to apply to all sense amplifiers.  Chip timing
circuit (6) controls the chip function totally.

      CCD LCD driver fundamentally has the capability of any number
of gray level.  Direct sourcing of the analog video signals makes LCD
panel the replacement of CRT display device.  Not only computer video
signals but also television animated signals can be us...