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componentes Descripción

Fabricante

LH1684F

5 V Drive 240 Outputs TFT-LCD Source Driver

Sharp Electronics 

SHARP

4. Block Diagram

RL

CSl

cs2

TST

TSTl

TST2

TST3

LH 1684F

3

1

Numerals in circles indicate the pin number.

Bkdirectional shift

Control

logic

vcc GND

............................

6, --_-_-_-____------_--

OS1 ..........................OS240

Block name

Control logic

I

Block function

i

I Used to create signals necessary for controlling cascade sequence

’ and for discharge signal and sampling signals creation circuits, etc.

Bi-directional shift register

~Used as transfer circuit of video sampling start signals.

’ It is possible to set the direction of sampling start signals sequence

/ by setting the FVL pin, from OS1 to OS240 or from OS240 to OS1 .

Sampling signal creation circuit Used to create the sampling signals corresponding to each output

j pin based on the sampling start signals transferred by the bi-

i directional shift register.

Mode setting circuit

/ Used to set the form of the video signals to be sent to the sample

1and hold circuits.

Sample and hold circuit

Used to sample the video signals input from the mode setting circuit I

:at the timing of the sampling signals and hold the sampling datas I

I until the next sampling operation.

Output circuit

i The circuit comprises an operational amplifier and an output buffer i

1and outputs the voltage corresponding to the data held in the

I

/sample and hold circuit.

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