hd61603r ETC-unknow, hd61603r Datasheet - Page 26

• Manufacturer Part Number: hd61603r
• Description: Segment Type Lcd Driver
• Manufacturer: ETC-unknow

Liquid Crystal Display Drive Voltage Circuit (HD61602)
What is LCD Voltage?
HD61602 drives liquid crystal display using four levels of voltages (Figure 19); VDD, V1, V2, and V3
(VDD is the highest and V3 is the lowest). The voltage between VDD and V3 is called VLCD and it is
necessary to apply the appropriate VLCD according to the liquid crystal display. V3 always needs to be
supplied regardless of the display duty ratio since it supplies the voltage to the LCD drive circuit of
HD61602.
Figure 19 LCD Output Waveform and Output Levels
V
V
V
VLCD
VDD
V1
V2
V3
HD61602/HD61603
1255