MXED202 데이터 시트보기 (PDF) - Clare Inc => IXYS

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MXED202

128-Channel OLED Row Driver

Clare Inc => IXYS 

Preliminary

MXED202

PRECHARGE:

(Organic) Light-Emitting Diodes are current controlled devices, their photonic output (luminance) being proportional

to the time-average charge passed through them. To pass charge, the forward voltage must first reach the diode

“on” threshold. In passive-matrix panel displays, OLED’s are connected in n-row x m-column matrix fashion. In the

row multiplex scheme, where a single row of OLED’s is activated at a time, the parasitic capacitance of the n-1 “off”

rows of OLED’s appears connected to the columns - this capacitance must be charged to the “on” threshold before

current flows through the selected “on” row diodes. If the column drive current alone were to charge this capaci-

tance, much of the allotted row time would be consumed in just reaching the “on” threshold. Therefore, to improve

the efficiency of the display, and to make luminance directly proportional to column current-magnitude and current-

duty cycle, the MXED102 and MXED202 Display drivers support optional voltage precharge. In all precharge

options, a predetermined voltage is impressed upon the diodes. For instance, the user may configure the precharge

voltage to be near the OLED “on threshold,” to bias the diodes to the onset of conduction.

The Timing Diagrams, Pages 10-11, illustrate the Prechage Options:

Condition

PCB=1

MONO=1

MONO=0

Precharge

No Precharge

A Monochromatic Precharge voltage may be applied via the MXED202 Row Driver, as a function of

CLK, PCB, MOD. During the Discharge interval, all Row and Column driver outputs are grounded,

discharging all pixels. At the beginning of the Active interval, a selected Precharge Voltage is applied

to all but the next active row, and the column drivers source data-driven currents.

Color/Monochrome Precharge by the MXED102 Column Driver, as function of CLK, PCB.

Rev. 2

www.clare.com

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