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HT0610 Datasheet(PDF) 3 Page - Holtek Semiconductor Inc

Part No. HT0610
Description  33 x 120 LCD Driver
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Maker  HOLTEK [Holtek Semiconductor Inc]
Homepage  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT0610 Datasheet(HTML) 3 Page - Holtek Semiconductor Inc

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Description
Static Icon Control Circuit
This module generates the LCD waveform of the 4 annunciators and IBP signal. The
four independent static icons are enabled by software command. Icon signals are also
controlled by oscillator circuit, too.
LCD Driving Voltage
Generator
This module generates the LCD voltage needed for display output. It takes a single sup-
ply input and generates necessary bias voltages. It consists of:
· Voltage doubler and voltage tripler
To generate the VCCA1 voltage. Either doubler or tripler can be enabled.
· Voltage regulator
Feedback gain control for initial LCD voltage. It can also be used with external contrast
control.
· Voltage divider
Divide the LCD display voltage (VLL2~VLL6) from the regulator output. This is low
power consumption circuit, which can save the most display current compare with tra-
ditional resistor ladder method.
· Bias Ratio Selection circuitry
Software control of 1/5 and 1/7 bias ratios to match the characteristic of LCD panel.
· Self adjust temperature compensation circuitry
Provide 4 different compensation grade selections to satisfy the various liquid crystal
temperature grades. The grading can be selected by software control.
· Contrast Control Block
Software control of 16 voltage levels of LCD voltage.
· External Contrast Control
By adjusting the gain control resistors connected externally, the contrast can be var-
ied.
All blocks can be individually turned off if external voltage generator is employed.
120 Bit Latch/33 Bit Latch
153 bit long registers, which carry the display signal information. First 33 bits are Com-
mon driving signals and other 120 bits are Segment driving signals. Data will be input to
the HV-buffer Cell for bumping up to the required level.
Level Selector
Level selector is a control of the display synchronization. Display voltage can be sepa-
rated into two sets and used with different cycles. Synchronization is important since it
selects the required LCD voltage level to the HV Buffer Cell for output signal voltage
pump.
HV Buffer Cell
(Level Shifter)
HV Buffer Cell works as a level shifter that translates the low voltage output signal to the
required driving voltage. The output is shifted out with an internal FRM clock, which co-
mes from the Display Timing Generator. The voltage levels are given by the level selec-
tor which is synchronized with the internal M signal.
HT0610
Rev. 1.00
3
February 24, 2004


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