SSD1789A Solomon Systech, SSD1789A Datasheet - Page 25

• Manufacturer Part Number: SSD1789A
• Description: CSTN LCD Driver
• Manufacturer: Solomon Systech

www.DataSheet4U.com
7.6
This module is an On-Chip low power RC oscillator circuitry (Figure 6). The oscillator generates the clock for
the DC-DC voltage converter. This clock is also used in the Display Timing Generator.
Figure 6 - Oscillator structural block diagram
7.7
This block is a series of latches carrying the display signal information. These latches hold the data, which will
be fed to the HV Buffer Cell and Level Selector to output the required voltage level.
7.8
This block is embedded in the Segment/Common Driver Circuits. HV Buffer Cell works as a level shifter,
which translates the low voltage output signal to the required driving voltage. The output is shifted out with
reference to the internal FRM clock, which comes from the Display Timing Generator. The voltage levels are
given by the level selector, which is synchronized with the internal M signal.
7.9
This block is embedded in the Segment/Common Driver circuits. Level Selector is a control of the display
synchronization. Display voltage levels can be separated into two sets and used with different cycles.
Synchronization is important since it selects the required LCD voltage level to the HV Buffer Cell, which in turn
outputs the COM or SEG LCD waveform.
SSD1789A Series Rev 1.0
OSC1
Oscillator Circuit
Display Data Latch
HV Buffer Cell (Level Shifter)
Level Selector
Oscillation Circuit
Internal resistor
www.DataSheet4U.com
P 25/69 Jul 2004
enable
OSC2
enable
Buffer
Oscillator
enable
(CL)
Solomon Systech
www.DataSheet
www.DataSheet4U
www.DataSheet
www.DataSheet
4U
4U.com
4U
.com
.com
.com