H838532H datasheet(395/508 Pages) RENESAS

395 / 508 page

Section 13 LCD Controller/Driver

Rev. 1.00 May 30, 2008 Page 375 of 484

REJ09B0436-0100

13.3

Operation

13.3.1

Settings Up to LCD Display

To perform LCD display, the hardware and software related items described below must first be

determined.

(1) Hardware Settings

a. Using 1/2 duty

When 1/2 duty is used, interconnect pins V

2 and V3 as shown in figure 13.3.

VCC

VSS

Figure 13.3 Handling of LCD Drive Power Supply when Using 1/2 Duty

b. Large-panel display

As the impedance of the built-in power supply split-resistance is large, it may not be suitable

for driving a large panel. If the display lacks sharpness when using a large panel, refer to

section 13.3.6, Boosting the LCD Drive Power Supply. When static or 1/2 duty is selected, the

common output drive capability can be increased. Set CMX to 1 when selecting the duty cycle.

In this mode, with a static duty cycle pins COM

4 to COM1 output the same waveform, and with

1/2 duty the COM

1 waveform is output from pins COM2 and COM1, and the COM2 waveform

is output from pins COM

4 and COM3.

c. Luminance adjustment function (V

0 pin)

Connecting a resistance between the V

0 and V1 pins enables the luminance to be adjusted. For

details, see section 13.3.3, Luminance Adjustment Function (V

0 Pin).

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