Sharp LH168R Datasheet

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DESCRIPTION

The LH168R is a 384-output TFT-LCD source driver IC which can simultaneously display 16.7 million colors in 256 gray scales.

FEATURES

• Number of LCD drive outputs : 384

• Built-in 8-bit digital input DAC

• Dot-inversion drive : Outputs the inverted gray scale voltages between LCD drive pins next to each other

• 2-port input for each circuit of data inputs R, G and B, and it is possible to sample and hold display data of two pixels at the same time

• Possible to display 16.7 million colors in 256 gray scales with reference voltage input of 18 gray scales : This reference voltage input corresponds to ‹ correction and intermediate reference voltage input can be abbreviated

• Cascade connection

• Sampling sequence : Output shift direction can be selected XO

1, YO1, ZO1/XO128, YO128, ZO128 or

128, YO128, XO128/ZO1, YO1, XO1

• Shift clock frequency : 65 MHz (MAX.)

• Supply voltages –V

CC (for logic system) : +2.5 to +3.6 V

–V

LS (for LCD drive) : +13 V (MAX.)

• Package : 464-pin TCP (Tape Carrier Package)

PIN CONNECTIONS

LH168R

384-output TFT-LCD Source Driver IC

XO128 YO128 ZO128

382 383 384

YO1 ZO1

1 2 3

CHIP SURFACE

GND VLS GND XB7

XB0 XA7

XA0 YA7

YA0 SPOI VH0 VH32 VH64 VH96 VH128 VH160 VH192 VH224 VH256 VL256 VL224 VL192 VL160 VL128 VL96 VL64 VL32 VL0 POLB POLA CK SPIO LS REV YB7

YB0 ZB7

ZB0 ZA7

ZA0 LBR VCC VLS GND

464 463 462 461

454 453

446 445

438 437 436 435 434 433 432 431 430 429 428 427 426 425 424 423 422 421 420 419 418 417 416 415 414 413 412

405 404

397 396

389 388 387 386 385

464-PIN TCP

TOP VIEW

NOTE :

Doesn't prescribe TCP outline.

LH168R

PIN NO. SYMBOL I/O DESCRIPTION

1 to 384 XO

1-ZO128 O LCD drive output pins

385, 462, 464 GND – Ground pins

386 V

LS – Power supply pin for analog circuit

387 V

CC – Power supply pin for digital circuit

388 LBR I Shift direction selection input pin

389 to 396 ZA

0-ZA7 I Data input pins

397 to 404 ZB0-ZB7 I Data input pins 405 to 412 YB

0-YB7 I Data input pins

413 REV I LCD drive output polarity exchange input pin 414 LS I Latch input pin 415 SPIO I/O Start pulse input/cascade output pin 416 CK I Shift clock input pin

417, 418 POLA, POLB I Input data polarity exchange input pins

419 to 427 VL

0-VL256 I Reference voltage input pins

428 to 436 VH256-VH0 I Reference voltage input pins

Data input pinsIXB

0-XB7454 to 461

Data input pinsIXA

0-XA7446 to 453

Data input pinsIYA

0-YA7438 to 445

Start pulse input/cascade output pinI/OSPOI437

463 V

LS – Power supply pin for analog circuit

PIN DESCRIPTION

LH168R

PLOB 418

POLA 417

405

461

454

438

453

XA0 XB0

XB7 YB0

YB7 ZB0

ZB7

446

CK 416

SPOI 437

LBR 388

VL256 427

VH256 428

0 436

REV 413

VL0 419

397

412

389

445

404396

414

382

463

415

462387

464385

SPIO

386 VLS

XO12YO13ZO1 XO128

383

YO128

384

ZO128

8 x 2

256 x 2

12821

CC GND GND GND

SHIFT REGISTER

SAMPLING MEMORY

HOLD MEMORY

DATA

LATCH

REFERENCE

VOLTAGE

GENERATION

CIRCUIT

LEVEL SHIFTER

DA CONVERTER

OUTPUT CIRCUIT

XA7 YA0

ZA0

YA7

ZA7

BLOCK DIAGRAM

LH168R

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

GND

To Internal Circuit

Fig. 1 Input Circuit (1)

¿Applicable pins¡ CK, LS, REV, LBR, XA

0-XA7, XB0-XB7,

0-YA7, YB0-YB7,

0-ZA7, ZB0-ZB7

GND GND

To Internal Circuit

Fig. 2 Input Circuit (2)

¿Applicable pins¡ POLA, POLB

FUNCTIONAL OPERATIONS OF EACH BLOCK

LH168R

GND

From Internal Circuit

Operational Amplifier

+ –

Fig. 4 Output Circuit

¿Applicable pins¡ XO

1-XO128,

1-YO128,

1-ZO128

VCC

GND

Nch Tr

Output Signal

Output Control Signal

VCC

GND

To Internal Circuit

Pch Tr

Fig. 3 Input/Output Circuit

¿Applicable pins¡ SPIO, SPOI

LH168R

SYMBOL FUNCTION

CC Used as power supply pin for digital circuit, connected to +2.5 to +3.6 V.

LS Used as power supply pin for analog circuit, connected to +8.0 to +13.0 V.

GND Used as ground pin, connected to 0 V.

SPIO SPOI

Used as input pins of start pulse and also used as output pins for cascade connection.

When "H" is input into start pulse input pin, data sampling is started. On completion of

sampling, "H" pulse is output to output pin for cascade connection. Pin functions are

selected by LBR. For selecting , refer to "Functional Operations".

LBR

Used as input pin for selecting the shift register direction. For selecting, refer to

"Functional Operations".

Used as input pin for parallel transfer from sampling memory to hold memory. Data is

transferred at the rising edge and output from LCD drive output pin.

Used as shift clock input pin. Data is latched into sampling memory from data input pin at

the rising edge.

0-VH256

VL0-VL256

Used as reference voltage input pins. Hold the reference voltage fixed during the period of

LCD drive output. For relation between input data and output voltage values, refer to

"Output Voltage Value". For internal gamma correction, refer to "Gamma Correction

Value". Observe the following relation for input voltage.

LS > VH0 ≥ VH32 ≥ π ≥ VH256 ≥ VL256 ≥ π ≥ VL32 ≥ VL0 > GND.

0-XA7, YA0-YA7

ZA0-ZA7, XB0-XB7 YB0-YB7, ZB0-ZB7

Used as data input pins of R, G, and B colors. 8-bit x 2-pixel data are input from data pins

at the rising edge of CK. For relation between input data and output voltage values, refer

to "Functional Operations" and "Output Voltage Value". Select the data to be entered

into X, Y, and Z according to picture element arrays of the panel.

1-XO128

YO1-YO128 ZO1-ZO128

Used as LCD drive output pins which output the voltage corresponding to the input of data

input pins (XA

0 to XA7, YA0 to YA7, ZA0 to ZA7, XB0 to XB7, YB0 to YB7, ZB0 to ZB7).

Data of XO1 to XO128 correspond to XA0 to XA7 and XB0 to XB7. Data of YO1 to YO128

correspond to YA0 to YA7 and YB0 to YB7, and data of ZO1 to ZO128 correspond to ZA0 to

ZA7 and ZB0 to ZB7. For relation between input data and output voltage values, refer to

"Functional Operations" and "Output Voltage Value".

POLA POLB

Used as input pins for input data polarity exchange, POLA corresponds to XA

0 to XA7, YA0

to YA7 and ZA0 to ZA7, and POLB corresponds to XB0 to XB7, YB0 to YB7 and ZB0 to ZB7.

When "L" is entered, display data becomes normal mode. When "H" is entered, input data

becomes polarity exchange mode. For relation between input data and output voltage

values, refer to "Output Voltage Value". These pins are pulled down at the inside.

REV

Used as polarity exchange pin of LCD drive output. Date is taken at the term when LS is

"H" and the output polarity of the LCD drive output pin is determined. For exchanging, refer

to "Output Characteristics".

FUNCTIONAL DESCRIPTION

Pin Functions

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