6 BIT 420 CHANNEL TFT-LCD SOURCE DRIVER
November. 1999.
Ver. 0.2
Prepared by:
Si-Wang, Sung
mail to : iamturbo@samsung.co.kr
KS0678
Contents in this document are subject to change without notice. No part of this document may be reproduced
or transmitted in any form or by any means, electronic or mechanical, for any purpose, without the express
written permission of LCD Driver IC Team.
KS0678
6 BIT 420 CHANNEL TFT-LCD SOURCE DRIVER
2
KS0678 Specification Revision History
Version
Content
Date
0.0
Original
Aug.1999
0.1
The content of page 17 has been modified
Aug.1999
0.2
The content of page 18 has been modified
Nov.1999
6 BIT 420 CHANNEL TFT-LCD SOURCE DRIVER
KS0678
3
CONTENTS
INTRODUCTION ................................................................................................................................................. 4
FEATURES ......................................................................................................................................................... 4
BLOCK DIAGRAM .............................................................................................................................................. 5
PIN ASSIGNMENTS............................................................................................................................................ 6
PIN DESCRIPTIONS ........................................................................................................................................... 7
OPERATION DESCRIPTION............................................................................................................................... 8
DISPLAY DATA TRANSFER ............................................................................................................................ 8
EXTENSION OF OUTPUT ............................................................................................................................... 8
RELATIONSHIP BETWEEN INPUT DATA VALUE AND OUTPUT VOLTAGE .................................................. 8
ABSOLUTE MAXIMUM RATINGS .................................................................................................................... 15
RECOMMENDED OPERATION CONDITIONS.................................................................................................. 15
DC CHARACTERISTICS................................................................................................................................... 16
AC CHARACTERISTICS................................................................................................................................... 17
WAVEFORMS ................................................................................................................................................... 18
RELATIONSHIPS BETWEEN CLK1, START PULSE (DIO1, DIO2) AND BLANKING PERIOD ........................ 19
KS0678
6 BIT 420 CHANNEL TFT-LCD SOURCE DRIVER
4
INTRODUCTION
The KS0678 is a 420 channel output, TFT-LCD source driver for 64 gray scale displays. Data input is based on
digital input consisting of 6 bits by 6 dots, which can realize a full-color display of 260,000 colors by output of 64
values gamma-corrected.
This device has an internal D/A (Digital-to-Analog) converter for each output and 10 (5-by-2) external power
supplies. Because the output dynamic range is as large as 4.8 - 7.8 Vp-p, it is unnecessary to operate level
inversion of the LCD's common electrode. Besides, to be able to deal with dot-line inversion when mounted on a
single-side, output gray scale voltages with different polarity can be output to the odd number output pins and the
even output pins.
KS0678 can be adopted to larger panel, and SHL (shift direction selection) pin makes use of the LCD panel
connection conveniently. Maximum operation clock frequency is 45 MHz at a 2.7 V logic operation. it can be
applied to the TFT-LCD panel of SXGA+(1400 * RGB) standards.
FEATURES
TFT active matrix LCD source driver LSI
64 Gary-scale is possible through 10 (5 by 2) external power supply and D/A converter
Both dot inversion display and N-line inversion display are possible
CMOS level input
Compatible with gamma-correction
Input data inversion function (DATPOL1, 2)
Logic supply voltage: 2.7 - 3.6 V
LCD driver supply voltage: 5.0 - 8.0 V
Output dynamic range: 4.8 - 7.8 Vp-p
Maximum operating frequency: fMAX = 45 MHz (internal data transmission rate at 2.7 V operation)
Output: 420 outputs
TCP
6 BIT 420 CHANNEL TFT-LCD SOURCE DRIVER
KS0678
5
BLOCK DIAGRAM
Output Buffer
D/A Converter
Data Register
70bit Shift Register
Data Control
SHL
6
Y001
Y002
Y003
Y418
Y419
Y420
DIO2
DIO1
CLK2
D00 - D05
D10 - D15
D20 - D25
D30 - D35
D40 - D45
D50 - D55
6
6
6
6
6
DATPOL1
DATPOL2
18
18
RPI2
6
6
6
6
6
6
VGMA1 -
VGMA10
10
Data Latch
6
6
6
6
6
6
Line Repair
Amp
POL
CLK1
TEST
RPI1
RPO2
RPO1
Figure 1. KS0678 Block Diagram
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