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GGG240128A05-A01 Schematic ( PDF Datasheet ) - GEMINI

Teilenummer GGG240128A05-A01
Beschreibung LCM MODULE
Hersteller GEMINI
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GGG240128A05-A01 Datasheet, Funktion
SPECIFICATION
FOR
LCM MODULE
MODULE NO.: GGG240128A05-A01
DOC.REVISION01
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GGG240128A05-A01 Datasheet, Funktion
5. LCD DRIVING VOLTAGE GENERATOR AND BIAS REFERENCE
CIRCUIT
NOTE: Recommended component values.
CB: 150~250xLCD load capacitance or 4.7 uF (2V). whichever is higher.
CL: 50Nf~0.1uF(25V)is appropriate for most applications..
Rl: 10MActs as a draining circuit when the power is abnormally shut down.
VR: 1M.
R1,R2: See instructions below.
CBIAS: 10nF~0.1Nf.
• The above component values are for reference only. Please optimize the values for individual
requirements of each specific application.
• To ensure consistency of LCM contrast. VLCD fine tuning is highly recommended.
Since the value of R1/R2 depends strongly on the GN,PM,BR settings, and vary slightly depends
on the value of VDD2,each LCM design will need to be optimized individually.
The following is the recommended procedures for selecting R1, R2 and VR values.
Step 1: adjust LCM for best contrast which CBIAS. But without R1, R2, VR.
Step 2: measure VBIAS voltage.
Step 3: select VR and R2 (recommend to start with VR=1M, R2=200K)
Step 4: calculate R1 by: R1 = R2 x (VDD2/VBIAS-1)
Step 5: install R1, R2, VR . The “neutral position” of VR is at VBIAS/VDD2 .
Step 6: Test the fine tuning range by adjusting VR over the full range.
Step7 : if adjustment fang is too narrow, reduce R2,… and vise versa.
Step 8: repeat from Sept 4.
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