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HT9B95B Datasheet(PDF) 12 Page - Holtek Semiconductor Inc |
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HT9B95B Datasheet(HTML) 12 Page - Holtek Semiconductor Inc |
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12 / 32 page  Rev. 1.10 12 November 25, 2015 HT9B95A/B/G LCD Bias Generator The max voltage level of the LCD driving voltage named as V0 can be adjusted through the LVA command setting. The full-scale LCD voltage, VOP, is obtained from (V0-VSS). Fractional LCD biasing voltages, known as 1/3 or 1/4 bias voltage, are obtained from an internal voltage divider several of series resistors connected between VLCD and VSS. Certain resistors can be switched out of circuits to pro- ertain resistors can be switched out of circuits to pro- resistors can be switched out of circuits to pro- s can be switched out of circuits to pro- can be switched out of circuits to pro- switched out of circuits to pro- switched out of circuits to pro- s to pro- to pro- vide a 1/3 or 1/4 bias voltage level configuration. LCD Drive Mode Waveforms • When the LCD drive mode is selected as 1/4 duty and 1/3 bias, the waveform and LCD display is shown as follows: SEG n+2 SEG n+2 SEG n SEG n COM0 COM0 COM1 COM1 State1 (on) State1 (on) State2 (off) State2 (off) tLCD COM2 COM2 SEG n+3 SEG n+3 COM3 COM3 SEG n+1 SEG n+1 V0 V0 2Vop/3 2Vop/3 Vop/3 Vop/3 VSS VSS A Type inversion A Type inversion SEG n+2 SEG n+2 SEG n SEG n COM0 COM0 COM1 COM1 tLCD COM2 COM2 SEG n+3 SEG n+3 COM3 COM3 SEG n+1 SEG n+1 V0 V0 2Vop/3 2Vop/3 Vop/3 Vop/3 VSS VSS V0 V0 2Vop/3 2Vop/3 Vop/3 Vop/3 VSS VSS V0 V0 2Vop/3 2Vop/3 Vop/3 Vop/3 VSS VSS V0 V0 2Vop/3 2Vop/3 Vop/3 Vop/3 VSS VSS V0 V0 2Vop/3 2Vop/3 Vop/3 Vop/3 VSS VSS V0 V0 2Vop/3 2Vop/3 Vop/3 Vop/3 VSS VSS V0 V0 2Vop/3 2Vop/3 Vop/3 Vop/3 VSS VSS V0 V0 2Vop/3 2Vop/3 Vop/3 Vop/3 VSS VSS B Type inversion B Type inversion V0 V0 2Vop/3 2Vop/3 Vop/3 Vop/3 VSS VSS V0 V0 2Vop/3 2Vop/3 Vop/3 Vop/3 VSS VSS V0 V0 2Vop/3 2Vop/3 Vop/3 Vop/3 VSS VSS V0 V0 2Vop/3 2Vop/3 Vop/3 Vop/3 VSS VSS V0 V0 2Vop/3 2Vop/3 Vop/3 Vop/3 VSS VSS V0 V0 2Vop/3 2Vop/3 Vop/3 Vop/3 VSS VSS V0 V0 2Vop/3 2Vop/3 Vop/3 Vop/3 VSS VSS LCD status LCD status Waveforms for 1/4 duty drive mode with 1/3 bias (VOP=V0-VSS) Note: tLCD=1/fLCD |
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