Service manual

LCDPCB
Power management
Timing control
Temp.compensation
LCD Panel
D0,D1,D2,D3
LCLK, LLP,LLP,LACD
VSS
LLP,LFRAM
DOFF, LACD
VOL1,VOL2,VOL3
VDD,VSS
Disp
Dfram
Frame
VD1
VD2
VM
Vdd
Vcc
Vss
Figure 2.Taichi LCD Panel Electrical Block
EZ328
LCD
Controller
Main
Board
2.2 Driving signal from LCD controller
The function of each signal is as follows:
D0-D3---------LCD data bus is used to transfer pixel data to the LCD panel.
LFRAME-----LCD frame scan signal indicates the start of a new frame.
LLP------------LCD line scan signal is used to latch a line of shifted data.
LCLK---------LCD shift clock signal is the clock output which the display data is
synchronized.
LACD---------LCD alternate crystal direction output signal is toggled to alternate
the
crystal polarization on the panel.
DOFF----------LCD ON/OFF control signal.
Figure 3 is the timing waveform for these signals.