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參數(shù)資料
| 型號： | MXED202 |
| 廠商： | CLARE INC |
| 元件分類： | 顯示驅(qū)動器 |
| 英文描述： | 128-Channel OLED Row Driver |
| 中文描述： | LED DISPLAY DRIVER, UUC149 |
| 封裝： | GOLD BUMP, DIE-149 |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 560K |
| 代理商： | MXED202 |
MXED202
www.clare.com
9
Rev. 2
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
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.
MONO=0
Preliminary
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