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Method and apparatus for healing of low-ohmic defects, display with the apparatus

A display and defect technology, which is applied in the directions of measuring devices, identification devices, lighting devices, etc., can solve the problems such as the drop of the light-emitting layer of the display

Inactive Publication Date: 2009-08-05
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a result, the lifetime of the display may drop below what the emissive layer would have been

Method used

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  • Method and apparatus for healing of low-ohmic defects, display with the apparatus
  • Method and apparatus for healing of low-ohmic defects, display with the apparatus
  • Method and apparatus for healing of low-ohmic defects, display with the apparatus

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Embodiment Construction

[0037] The invention is illustrated with reference to organic or polymer light emitting diode displays.

[0038] figure 1Represents the equivalent circuit of part of a matrix display with light-emitting diodes, including anode and cathode drivers. The anode driver is usually designed as a constant current source with a current-dependent output characteristic curve R a (I). R co1 is the internal resistance of this unit, connect this defect to the anode driver. The defect itself is characterized by a resistor R d . In this embodiment, cathode c1 is selected, and cathodes c2 and c3 are not selected. The corresponding cathode driver output characteristics are determined by the resistor R c，se1 and R c，dc to make sure.

[0039] Assuming multiplexed driving in a common cathode manner, the following methods of providing the required repair energy with cathode drivers are possible:

[0040] 1. During the shortest clock cycle t min , forcing the anode potential to ground. T...

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PUM

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Abstract

A method of healing low-ohmic defects in a flat display is characterized by passing an extra current during a pre-determined time period through the affected subarea of the flat display, said current being selected to turn at least one defect or a specific surrounding of at least one defect into a high-ohmic state which has a resistance higher than the initial resistance of said at least one defect.

Description

technical field [0001] The present invention relates to methods of repairing low ohmic defects in flat panel displays. Background technique [0002] "Low ohmic defect" means that the leakage current caused by this defect affects the human visual performance of the display. [0003] A flat panel display is a stack of structural layers including at least one transparent electrode layer, one light-emitting or light-absorbing or polarizing layer, or any other kind of light-modulating layer and a counter electrode layer. One or all of the electrode layers and light modulating layers are formed to individually address sub-regions of the display, usually by switching the drive of the sub-regions. In a matrix display, this sub-area is a single pixel, while in a segmented display, each segment defines a sub-area. [0004] Self-emitting passive segmented or matrix displays based on light-emitting polymers have gradually entered the market a few years ago. Such displays make use of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/30H05B33/10G01R33/561G02F1/1343G02F1/135G09F9/00G09G3/20G09G3/3216G09G3/3225G09G3/3266G09G3/3275H01L51/50H05B33/14
CPCG09G2330/08G09G3/20G09G2320/029G09G3/3275G09G3/3225G09G2300/08G09G3/3266H01L2251/568G09G2320/043G09G3/3216G09G2300/06G09G2310/0256G09G2330/12H10K71/861G01R33/561
Inventor G·格雷伊M·H·克赖恩P·范德维杰B·J·C·贾科布斯J·格特斯
Owner KONINKLIJKE PHILIPS ELECTRONICS NV