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componentes Descripción

Fabricante

LH168R

384-output TFT-LCD Source Driver IC

Sharp Electronics 

LH168R

FUNCTIONAL OPERATIONS OF EACH BLOCK

BLOCK

FUNCTION

Shift Register

Used as a bi-directional shift register which performs the shifting operation by CK and

selects bits for data sampling.

Data Latch

Used to temporary latch the input data which is sent to the sampling memory.

Sampling Memory

Used to sample the data to be entered by time sharing.

Hold memory

Used for latch processing of data in the sampling memory by LS input.

Level Shifter

Used to shift the data in the hold memory to the power supply level of the analog circuit

unit and sends the shifted data to DA converter.

Reference Voltage

Generation Circuit

Used to generate a gamma-corrected 256 x 2-level voltage by the resistor dividing circuit.

DA Converter

Used to generate an analog signal according to the display data and sends the signal to

the output circuit.

Output Circuit

Used as a voltage follower, configured with an operational amplifier and an output buffer,

which outputs analog signals of 256 x 2 gray scales to LCD drive output pin.

INPUT/OUTPUT CIRCUITS

VCC

I

GND

Fig. 1 Input Circuit (1)

¿Applicable pins¡

To Internal Circuit CK, LS, REV, LBR,

XA0-XA7, XB0-XB7,

YA0-YA7, YB0-YB7,

ZA0-ZA7, ZB0-ZB7

VCC

I

To Internal Circuit

GND GND

Fig. 2 Input Circuit (2)

¿Applicable pins¡

POLA, POLB

4

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