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Driver for controlling a light emitting element, in particular an organic light emitting diode

A technology for light-emitting diodes and light-emitting elements, which is applied in the field of drivers for controlling light-emitting elements, especially organic light-emitting diodes OLED, can solve the problems of dynamic difficulties in pixel programming and the like

Inactive Publication Date: 2009-06-03
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] - Difficulties in the dynamics of required pixel programming due to small currents

Method used

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  • Driver for controlling a light emitting element, in particular an organic light emitting diode
  • Driver for controlling a light emitting element, in particular an organic light emitting diode
  • Driver for controlling a light emitting element, in particular an organic light emitting diode

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Embodiment Construction

[0029] exist figure 1 The basic principles of the invention are illustrated in . figure 1 A driver for controlling an organic light emitting diode DO is shown. The circuit is composed of a voltage source Vdc, a capacitor C0, a switch S and an organic light emitting diode DO. The diode DO has an anode and a cathode. The cathode is connected to ground potential. The anode of diode DO is connectable via switch S to one electrode of capacitor C0. The other electrode of the capacitor is connected to ground potential. Furthermore, the voltage source Vdc can also be connected to the capacitor via a switch S. The voltage source is related to ground potential. Ground potential is chosen for convenience only. Alternatively, any predetermined reference potential may be chosen. The switch S connects either the voltage source Vdc to the capacitor or the diode DO to the capacitor. The voltage source and the diode are never connected to capacitor C0 at the same time.

[0030] Opera...

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PUM

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Abstract

The present invention relates to a circuit for controlling a light emitting element, in particular an organic light emitting diode. The circuit comprises a capacitor connectable with the light emitting element, charging means for charging the capacitor and a switching means. The switching means is adapted to alternately disconnect the capacitor from the light emitting element and connect the capacitor to the light emitting element. The capacitor is alternately charged and discharged. A charging current or a discharge current from the capacitor drives the current of the light emitting element. Said charging means comprises at least one charging transistor for charging the capacitor.

Description

technical field [0001] The invention relates to a driver and a method for controlling a light-emitting element, especially an organic light-emitting diode (OLED). These OLEDs can be used as pixels in micro displays. An organic light emitting diode (OLED) is a special type of light emitting diode (LED) in which the emissive layer comprises a thin film of an organic compound. The emissive electroluminescent layer may comprise a polymer substrate which, by using simple "printing" methods, allows the deposition of suitable organic compounds, for example on a support, in rows and columns, thereby creating Pixel matrix of light of different colors. Background technique [0002] OLED displays can be used in television screens, computer monitors, portable system screens, and advertising and information and indication applications, among others. OLEDs can also be used as light sources for general lighting. OLEDs are suitable for realizing large-area light-emitting elements. A bi...

Claims

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Application Information

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IPC IPC(8): G09G3/32G11C27/02H05B44/00
CPCG09G3/3258H02H9/001H05B33/0896G09G3/2018G11C27/024G09G2300/0852G09G2300/0861H05B45/60Y02B20/30
Inventor 海因里希·谢曼菲利普·勒罗伊冈瑟·哈斯
Owner THOMSON LICENSING SA