Samsung KS0678 Datasheet
6 BIT 420 CHANNEL TFT-LCD SOURCE DRIVER
KS0678
written permission of LCD Driver IC Team.
November. 1999.
Prepared by: Si-Wang, Sung
mail to : iamturbo@samsung.co.kr
Ver. 0.2
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
KS0678 6 BIT 420 CHANNEL TFT-LCD SOURCE DRIVER
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
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6 BIT 420 CHANNEL TFT-LCD SOURCE DRIVER KS0678
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
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KS0678 6 BIT 420 CHANNEL TFT-LCD SOURCE DRIVER
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
4
6 BIT 420 CHANNEL TFT-LCD SOURCE DRIVER KS0678
Y001
BLOCK DIAGRAM
POL
VGMA1 -
VGMA10
CLK1
RPO2 RPO1
Line Repair
Amp
RPI2
RPI1
10
Y420
6 6 6 6 6 6
6 6 6 6 6 6
Y419
Y418
Output Buffer
D/A Converter
Data Latch
Y003
Y002
DATPOL1
DATPOL2
D00 - D05
D10 - D15
D20 - D25
D30 - D35
D40 - D45
D50 - D55
CLK2
Data Register
6
6
6
6
6
6
18
18
Data Control
70bit Shift Register
DIO2 DIO1
SHL
TEST
Figure 1. KS0678 Block Diagram
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KS0678 6 BIT 420 CHANNEL TFT-LCD SOURCE DRIVER
PIN ASSIGNMENTS
Y001
Y002
Y003
Y004
Y417
Y418
Y419
Y420
KS0678
(Top View)
RPI1
RPO1
DIO1
D00
D01
D02
D03
D04
D05
D10
D11
D12
D13
D14
D15
D20
D21
D22
D23
D24
D25
TEST
DATPOL2
DATPOL1
POL
CLK1
CLK2
VSS1
VGMA1
VGMA2
VGMA3
VGMA4
VGMA5
VSS2
VDD2
VGMA6
VGMA7
VGMA8
VGMA9
VGMA10
SHL
VDD1
D30
D31
D32
D33
D34
D35
D40
D41
D42
D43
D44
D45
D50
D51
D52
D53
D54
D55
DIO2
RPO2
RPI2
Figure 2. KS0678 Pin Assignments
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