LH1687 데이터 시트보기 (PDF) - Sharp Electronics

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LH1687

240-output TFT-LCD Source Driver IC

Sharp Electronics 

Outline of Operation Timing

(1) Overall Operation Timing

Video signals of one horizontal scanning period are

sampled into the sample and hold circuits at the

timing of the internal sampling pulses of each

LH1687

output circuit, and data corresponding to the

sampled data are output.

Video Signals

Horizontal

Blanking

Period

Effective

Display

Period

One Horizontal

Scanning Period

(j)

Start Pulse

(Horizontal Scanning Start Pulse)

S1

One Horizontal

Scanning Period

(j + 1)

S240

(Internal Sampling Signals)

PS

(Power Save Signal)

OS1-OS240

(LCD Drive Outputs)

Output

High-Z

Sampling Data

(j – 1) Output

Output

High-Z

Sampling Data

(j) Output

Output

High-Z

Sampling Data

(j + 1) Output

(2) Timing of Video Signal Sampling

If the normal sampling operation and cascade

sequence is 1st, the video signal sampling (internal

sampling signal Sn (n = 1, 2, π, 240)) is started at the

rising edge of first clock after falling edge of start

pulse.

CK

0

Start Pulse

(Horizontal Scanning Start Pulse)

S1

(Normal Sampling Operation, Cascade Sequence 1st)

S2

1

2

Video Signal Sampling Start

13

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