8

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FN3180.5

July 21, 2005

Generating a Temperature Compensated Display Drive Voltage

Temperature has an important effect in the variation of

threshold voltage in multiplexed LCD displays. As

temperature rises, the threshold voltage goes down. For

applications where the display temperature varies widely, a

generated using the ICL7663S. This is shown in Figure 11

for the ICM7233 triplexed LCD display driver.

GND

ICM7233

ICL7663S

GND

DATA BUS

V+

+5V

1.8M

Ω

300k

Ω

2.7M

Ω

LOGIC

SYSTEM,

PROCESSOR,

ETC.

GND

FIGURE 11. GENERATING A MULTIPLEXED LCD DISPLAY DRIVE VOLTAGE

ICL7663S