Figure 13.14 Example Of Low-Power-Consumption Lcd Drive Operation - Renesas H8/3847R Series Hardware Manual

Section 13 LCD Controller/Driver
5. As can be seen from the above description, the capacitances and charging/discharging
periods of the capacitors are determined by the current dissipation of the LCD panel used.
The charging/discharging periods can be selected with bits CDS3 to CDS0.
6. The actual capacitor capacitances and charging/discharging periods must be determined
experimentally in accordance with the current dissipation requirements of the LCD panel.
An optimum current value can be selected, in contrast to the case in which a direct current
flows constantly in the built-in split-resistance.
V0
V1
V2
C2
V3
C3

Figure 13.14 Example of Low-Power-Consumption LCD Drive Operation

Rev. 6.00 Aug 04, 2006 page 454 of 680
REJ09B0145-0600
Charging
period Tc
V1 potential
V2 potential
V1×2/3
C1
V3 potential
V1×1/3
Power supply voltage fluctuation in 1/3 bias system
Discharging
period Tdc
Vd1
Vd2
Vd3
Voltage drop
associated with
discharging due
to LCD panel
driving