electroluminescent displays

E l e c t r o l u m i n e s c e n t D i s p l a y d e v i c e

The phenomenon of electroluminescence (EL) is the non-thermal conversion of electrical energy into

luminous energy

TFEL Device Structure

Circuit model and it’s working

ACTIVE-MATRIX EL (AMEL) DISPLAYS

COLOR TFEL DISPLAYS

Advantages: Increased in development in the field of EL device For example :recently devices are constructed without using insulator layer ,absence of short circuit

Disadvantages : Development in the field of other devices like 3d viewing devices and flat panels.

C O N C L U S I O N

It turned out that the performance of the dielectrics is criticalunder high voltage.

Nixie tube It’s a gaseous glow tube having set of electrodes each shaped

in the form of digit .

The principle behind the Nixie tube:

The circuitry driving Nixie is simple compared to 7 segment display but it is bulkier in size than 7 segment display

Circuit diagram

Also named as cold cathode glow discharge tube

Recent Nixie tubes

Modern Nixie’s consist of 0-9 digits with that symbols are also used like ‘+’ ‘-‘ .

Recently 15 digit Nixie’s are used to produce numeric and alpha numeric characters

REFERENCES

• M.J. Russ and D.I. Kennedy, "The Effects of Double Insulating Layers on the• Electroluminescence of Evaporated ZnS:Mn Films," J. Electrochem. Soc., 114, p.

1066, 1967.• 2. P.M. Alt, "Thin Film EL Devices: Device Characteristics and Performance," Proc. of

the SID,25, No. 2, p. 123, 1984.

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