LH1687 datasheet(13/21 Pages) SHARP

13 / 21 page

LH1687

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

output circuit, and data corresponding to the

sampled data are output.

Horizontal

Blanking

Period

Effective

Display

Period

Video Signals

Start Pulse

(Horizontal Scanning Start Pulse)

S240

(Internal Sampling Signals)

OS1-OS240

(LCD Drive Outputs)

(Power Save Signal)

Output

High-Z

Sampling Data

(j – 1) Output

Output

High-Z

Output

High-Z

Sampling Data

(j) Output

Sampling Data

(j + 1) Output

One Horizontal

Scanning Period

(j)

One Horizontal

Scanning Period

(j + 1)

(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.

Start Pulse

(Horizontal Scanning Start Pulse)

(Normal Sampling Operation, Cascade Sequence 1st)

Video Signal Sampling Start

LH1687 Datasheet(PDF) 13 Page - Sharp Corporation

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