MXED202 データシートの表示（PDF） - Clare Inc => IXYS

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MXED202

128-Channel OLED Row Driver

Clare Inc => IXYS 

MXED202

Preliminary

PRELIMINARY ELECTRICAL DATA SHEET

The MXED202 is a row-multiplexed display driver, for Passive Matrix Organic Light Emitting Diode (OLED) and

Polymer Light Emitting Diode arrays (PLED, PolyLED, LEP, . . .), with anodes connected to current-sourcing column

data drivers. The common cathode rows (channels) of the display matrix are activated by sequentially switching

them to a low impedance voltage source (ground/0V, typically) in synchronism with the digital data column current

drive. The MXED202 supports precharging options to improve luminance control. It is manufactured in a high volt-

age (30 V) CMOS process and provided in bumped die and TCP (Tape Carrier Package) form.

Overview

A row-scan token bit is passed along the length of MXED202 shift register to successively activate the row switch-

es. The OLED cathodes of the active row(s) are switched to RTN, a low impedance return, ground or 0V typically,

while the companion column drivers source data-driven currents through each OLED to be illuminated. Inactive rows

are connected to a programmable "Off" (or Precharge) voltage to ensure the OLED's are not forward-biased. A pro-

grammable precharge interval and programmable precharge voltage are available to set initial conditions for the next

active row(s).

In normal, or single token mode, the token may be entered at either end of the MXED202 row shift register (SRIN

or SLIN), depending on the shift direction selection Shift Right (SHR). The token is shifted one row (one channel)

per clock cycle, CLK. One row maximum is active at a time. In dual mode (DUAL), the token is entered at one end

and automatically in the center, and again the tokens may be selectively shifted left or right at the CLK rate; two rows

maximum are active at a time. The MXED202 has options for 128- and 120-row display panels. When the Select

128 (S128) pin is tied low, the token is also automatically entered at the fifth cell from the entry direction end; only

the 120 middle outputs, Rows 4 through 123, should be used. Note that a lesser number of rows may be used by

resetting the MXED202 (RSTB) at any time, truncating the shift cycle.

Overview of Operation

A row-scan token bit is passed along the length of MXED202 shift register to successively activate the row switch-

es. The OLED cathodes of the active row(s) are switched to RTN, a low impedance return, ground or 0V typically,

while the companion column drivers source data-driven currents through each OLED to be illuminated. Three suc-

cessive row activations, N-1, N, N+1, are depicted in the simplified timing diagram below. Inactive rows are con-

nected to a programmable "Off" (or Precharge) voltage to ensure the OLED's are not forward-biased. A

programmable precharge interval and programmable precharge voltage are available to set initial conditions for the

next active row(s). Precharge is described on page 9.

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