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An organic LED display device and a method for driving such a device

A display device and an organic technology, applied in the field of organic LED display devices and their drives, can solve problems such as leakage current reduction, local temperature reduction, damage, etc., and achieve the effect of reducing the probability of short circuit and increasing the risk of short circuit

Active Publication Date: 2006-01-11
BEIJING XIAOMI MOBILE SOFTWARE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Can lead to even larger localized leakage currents, resulting in new damage
Layers acting as "fuse" cannot maintain this leakage current
On the other hand, this damage can lead to a decrease in leakage current and thus a decrease in local temperature
Defects are neutralized until an increase in the applied electric field again causes new damage

Method used

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  • An organic LED display device and a method for driving such a device
  • An organic LED display device and a method for driving such a device
  • An organic LED display device and a method for driving such a device

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Embodiment Construction

[0024] As mentioned above, the invention is based on controlling the voltage of the light-emitting elements in the display so that it remains within a prescribed voltage range which reduces the risk of short circuits. How this range is specified is discussed in more detail below. refer to figure 1 , shows a pixel in an organic display device with a top electrode 1 and a bottom electrode 2 , and an intermediate organic (polymer (PPV) or small organic molecule) layer 3 .

[0025] The electrostatic attraction between the top and bottom electrodes 1 , 2 causes physical contact after the initial damage of the organic layer 3 . This force is directly related to the applied voltage (typically 50-100 MV / m) and the thickness of the organic layer 3 (typically 60-120 nm for PLED devices). Since the thickness of this layer is substantially constant, the voltage plays an important role in the formation of the short circuit.

[0026] Furthermore, it was found that the damage caused by th...

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Abstract

The present invention provides a method for driving an organic LED display device having a first and a second electrode sandwiching an organic layer defining a plurality of light emitting elements. The method comprises applying to a light emitting element a voltage within a specified voltage range, within which the risk of short circuits between the electrodes is reduced, and controlling the duty cycle of said light emitting element, so that a desired light intensity is emitted from said light emitting element. The probability of short circuits in pixels of an organic LED display device is thus reduced by avoiding operating the display pixels within voltage ranges where the chance of short circuits is high. This limitation of the applied voltage is compensated by controlling the duty cycle of the light emitting element.

Description

technical field [0001] The present invention relates to a method of driving an organic LED display device having first and second electrodes sandwiching an organic layer such as a polymer (PLED) or small organic molecule (OLED) layer. Background technique [0002] Short circuits in organic displays are particularly serious as they lead directly to pixel failure. In an organic LED device, the organic layer provides electrical isolation between the two electrodes, and during operation, this layer is subjected to a large electric field. Simultaneously local disturbances of the organic layer (particles, pinholes, etc.) occur and local leakage currents arise due to direct contact between the electrodes due to these disturbances. [0003] The electrical energy dissipated by local leakage currents causes short circuits to develop. Over the lifetime of the display, the voltage required to maintain a constant device current increases, causing increased energy dissipation. This vol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/32G09G3/20
CPCG09G3/3291G09G2300/0842G09G2320/043G09G3/2014G09G3/3233G09G3/2077G09G3/3216G09G3/30
Inventor M·T·约翰逊J·N·胡伯特斯P·维杰
Owner BEIJING XIAOMI MOBILE SOFTWARE CO LTD
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