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EL640.480-AM Operations Manual (020-0351-00C) 

6 

The EL panel is a matrix structure with column and row electrodes arranged in 
an X-Y formation. Light is emitted when an AC voltage of sufficient amplitude 
is applied at a row-column intersection. The display operation is based on the 
symmetric, line at a time data addressing scheme. Operating voltages required 
are provided by a DC/DC converter. 

Unless otherwise specified, performance characteristics are guaranteed when 
measured at 25°C. 

Power 

The supply voltages required for the displays are shown in Table 1. All internal 
high voltages are generated from display supply voltage (VH). The logic supply 
voltage (VL) should be present whenever video input signals or VH is applied.  

Table 1. DC Input Voltage Requirements. 

 

AM1, AM8 ETL

AM8 IN/ET 

Notes 

 

 

12 V 

24 V 

 

VL 

+5 V  

±5% 

  +5 V  

±5% 

  +5 V  

±5% 

absolute max 7.0 V 

VH 

+12 V 

±10% +12 

V 

±10% +24 

V 

±10%  absolute max. 15 V 

and 30 V 
respectively 

IL, max 

75 mA 

75 mA 

75 mA 

@ VL = +5 V 

IH, max 

2.0 A 

2.0 A 

1.0 A 

@ VH = +12 V 

Ptyp, 120 Hz 

11 W 

11 W 

11 W 

3840 'E' characters 

Pmax, 120 Hz 

24 W 

24 W 

24 W 

50/50 2x2 
checkerboard 

CAUTION: Absolute maximum ratings are those values beyond which 
damage to the device may occur. 

Table 2. Video Input Requirements. 

Description Min 

Max 

Notes 

Video logic high voltage 

3.7 V 

5.0 V 

All input thresholds are 
CMOS 

Video logic low voltage 

0 V 

0.9 V 

Video lines have 100 

Ω 

series resistors 

Video logic input current 

– 10 µA 

+10 µA 

 

There is no overcurrent protection on either the VH  or VL  inputs to protect 
against catastrophic faults. Planar recommends the use of a series fuse on the 
12 volt supply. A general guideline is to rate the fuse at 1.8 to 2 times the 
display maximum current rating.