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Method and driver for actuating a passive-matrix OLED display

A passive matrix, display technology, used in static indicators, instruments, light sources, etc., can solve the problem of display life reduction and other issues

Inactive Publication Date: 2011-04-27
エックスモーティフゲーエムベーハー
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

By this fact, the life of the display will also decrease dramatically with the temperature rise

Method used

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  • Method and driver for actuating a passive-matrix OLED display
  • Method and driver for actuating a passive-matrix OLED display
  • Method and driver for actuating a passive-matrix OLED display

Examples

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Embodiment Construction

[0040] figure 1 illustrates a C with m columns 1 ~C m and n rows of R 1 ~R n passive-matrix OLED displays 1 . The entire display can have as figure 1 Several displays of the display 1 are shown, these displays 1 are operated in parallel. Or the display may only include one display 1 .

[0041] At the intersection of column C and row R there is in each case an OLED 2 which can be powered by a current source 3 which can be assembled as a constant current source for the column. For this purpose, suitable column switches 4 are connected. In each case, the addressed row (illustrated as R in the figure i ) is connected to ground. However, the non-addressed rows are set at the common potential V by the column switch 5 COM . In order to minimize the power consumption of the OLED leakage current, this potential may correspond to the OLED forward voltage as described in the present invention.

[0042] Now figure 2 A simple model of an OLED pixel is illustrated. The inject...

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Abstract

The document describes a method and an apparatus for actuating a passive-matrix OLED display (1) with OLEDs (2) arranged in matrix form, wherein the columns are connected to a current source (3) for the purpose of actuating an OLED (2) and the rows are repetitively connected in succession for the duration of the row addressing time (tROW). The brightness (L) of a pixel situated at the point of intersection between a column and an addressed row is influenced by the connection time (tINJ), which is within the row addressing time (tROW), and the amplitude of the column current (IINj). To achieve energy-efficient actuation, it is proposed that the brightness (L) of the pixel be controlled on the basis of a charge quantity (QLUM_INJ) which is converted into light during the connection time (tINJ) of the column current (IINJ) and on the basis of a charge quantity (QLUM_Z) which is supplied from the capacitance (CP) of the OLEDs (2) and converted into light during a persistence time (tZ) by virtue of the column being switched to zero potential during the persistence time (tZ) and the charge quantity (QCAP) stored in the capacitance of the OLEDs (2) prior to the addressing being taken into account when determining the charge quantity (QLUM) converted on the OLED (2).

Description

technical field [0001] The invention relates to a method / unit for controlling a passive-matrix OLED display having OLEDs assembled in matrix form as claimed in the subject-matter of claim 1, wherein the individual columns are individually or It may be that several columns or all columns are simultaneously connected to the current source for driving the OLED or supplied with voltage, and each row is connected in the period of the row addressing time, that is, sequentially and continuously addressed, so that in each column At the intersection with the active row, the OLED is supplied with current and emits light. By addressing the individual rows, said individual rows are scanned one by one with a voltage which is applied for the current supply of the OLEDs assembled at this column. The converted charge at the OLED results in the brightness of the pixel located at the intersection of the column and the addressed row, and this brightness is affected by the on-time during the row...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/32H05B44/00
CPCG09G2330/045G09G2310/0251G09G2360/16G09G2310/0205G09G2310/0248G09G3/3216G09G2330/023G09G3/2014G09G2320/041G09G2310/061
Inventor 徐赤豪安德烈亚斯·卡伦鲍尔科斯米·科戴尔
Owner エックスモーティフゲーエムベーハー
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