LH1687 데이터 시트보기 (PDF) - Sharp Electronics

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LH1687

240-output TFT-LCD Source Driver IC

Sharp Electronics 

LH1687

VCCA

Operational

Amplifier

+

O

–

From Internal Circuit

GNDA

¿Applicable pins¡

OS1-OS240

Fig. 6 Output Circuit

FUNCTIONAL DESCRIPTION

Pin Functions

SYMBOL

VCCL

VCCA

GNDL

GNDA

TST1-TST4

TST5

SPIO

SPOI

CK

CTR

SAM

FUNCTION

Used as power supply pin for logic circuit, connected to +3.0 to +5.0 V.

Used as power supply pin for LCD drive circuit, connected to +3.0 to +5.0 V.

Must be set to VCCL ≤ VCCA.

Used as ground pin for logic circuit, connected to 0 V.

Used as ground pin for LCD drive circuit, connected to 0 V.

Used as input pins for IC testing, connected to VCCL (high level).

Used as input pins for IC testing, connected to VCCA (high level).

Used as input/output pins of cascade operation start signal.

SPIO becomes input pin of operation start signal and SPOI becomes output pin of

operation start signal of next IC when set to R/L = "H".

SPOI becomes input pin of operation start signal and SPIO becomes output pin of

operation start signal of next IC when set to R/L = "L".

Used as horizontal shift clock input pin.

Video signals are sampled in order at the rising and falling edge of CK.

Used as input pin of selecting video signal sampling circuits and selecting input signal of

output operational amplifiers.

Used as input pin for setting the selecting of normal sampling operation or 3-point

simultaneous sampling operation.

For normal sampling operation, video signals are sampled into sample and hold circuits

every 1 LCD drive output.

For 3-point simultaneous sampling operation, video signals are sampled into sample and

hold circuits every 3 LCD drive outputs simultaneously.

For either operation, sampling signals are shifted at every rising and falling edge of

horizontal shift clock of CK pin (half clock), and their sampling period is equal to the period

of one clock.

6

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