LH1687 데이터 시트보기 (PDF) - Sharp Electronics

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LH1687

240-output TFT-LCD Source Driver IC

Sharp Electronics 

LH1687

FUNCTIONAL OPERATIONS OF EACH BLOCK

BLOCK

FUNCTION

Control Logic

Used to create signals necessary for each operation mode setting and sampling signal

creation circuits, etc.

Bi-directional Shift

Register

Used as transfer circuit of video sampling start signals.

It is possible to set the direction of sampling start signal sequence OS1/OS240 or

OS240/OS1 by setting the R/L pin.

Sampling Signal

Used to create the sampling signals corresponding to each output pin based on the

Creation Circuit

sampling start signals transferred by the bi-directional shift register.

Mode Setting Circuit Used to set the form of the video signals to be sent to the sample and hold circuits.

Sample and Hold

Used to sample the video signals input from the mode setting circuit at the timing of the

Circuit

sampling signals and hold the sampling data until the next sampling operation.

Bias Generation Circuit Used to generate bias voltage necessary for output circuits.

Output Circuit

The circuit consists of a push-pull output operational amplifier and outputs the voltage

corresponding to the data held in the sample and hold circuits.

INPUT/OUTPUT CIRCUITS

VCCL

I

GNDL

Fig. 1 Input Circuit (1)

To Internal Circuit

¿Applicable pins¡

CK, CTR, MODE

VCCA

I

To Internal Circuit

GNDA

Fig. 2 Input Circuit (2)

¿Applicable pins¡

VA, VB, VC

4

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