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Pixel circuit for an active matrix OLED display

A technology of circuit device and driving circuit, which is applied in static indicator, electric lamp circuit arrangement, light source and other directions to achieve high-resolution effect

Active Publication Date: 2013-03-13
FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] The field of application of currently available OLED microdisplays is limited to unidirectional image reproduction microdisplays

Method used

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  • Pixel circuit for an active matrix OLED display
  • Pixel circuit for an active matrix OLED display
  • Pixel circuit for an active matrix OLED display

Examples

Experimental program
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Effect test

Embodiment Construction

[0046] The microdisplay with organic light emitting diodes 5 is preferably designed such that it comprises an organic layer (OLED) that emits light according to the current flow on the top metal plane on the CMOS substrate. They can be activated locally, ie as so-called pixels, in which a current flows locally through the organic light-emitting diode 5 via the electrodes of the organic light-emitting diode 5 . The active and passive components responsible for controlling each organic light emitting diode 5 (as regular transistors and capacitors) can be located below the electrodes in a matrix-like arrangement of pixel cells. figure 1 A schematic cross-sectional view of an OLED microdisplay is shown.

[0047] Such as figure 2 As shown, the individual accumulators for the organic light-emitting diodes 5 arranged in rows and columns are written to by corresponding circuits. In this regard, the image input data is received by the electronic control mechanism. The electronic co...

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Abstract

The invention relates to a circuit arrangement for organic light-emitting diodes arranged in a two-dimensional matrix. It can be used in particular in microdisplays. The object of the invention is to enable extensive influencing of the brightness and of the electromagnetic radiation emitted by the organic light-emitting diodes. With the circuit arrangement according to the invention, each organic light-emitting diode (5) can be driven by means of a storage circuit (10), a read amplifier (20) and a driver circuit (30). The driver circuit is formed by at least three series-connected transistors (1-3) and a further output transistor (4), the drain of which is connected to the anode of the respective organic light-emitting diode. In this case, a constant electrical operating voltage LVDD is applied to the source of the transistor (1) acting as driver, and a further likewise constant electrical operating voltage VDrive is applied to the gate of said transistor. The drain of the first transistor (1) is connected to the source of the transistor (2) which is connected in series next to said first transistor. Both gates of the following series-connected transistors (2, 3), which form a switch, are connected to the output of the read amplifier, and the electrical output voltage VSenseOut of said read amplifier is applied to said gates. The drains of the two transistors forming the switch are connected to the source of the output transistor (4), the gate of which is connected to ground potential or has a negative electrical voltage applied to it.

Description

technical field [0001] The invention relates to a circuit arrangement for organic light-emitting diodes arranged in a two-dimensional matrix. Background technique [0002] The ever-increasing number of information systems and environmental impacts provides information that people request as well as information that they do not. In this regard, the mobile display of information has become increasingly important. In this regard, microdisplays (i.e., very small displays with an image diagonal smaller than or equal to 20mm) provide the ability to display high-resolution images in a user-specific manner (i.e., for only one user or for multiple users) Possibility to display photographic information and video information. The field of application of microdisplays can be seen as near-eye applications. They include, for example, video glasses that can be connected to mobile multimedia devices (smartphones or mobile audio and video players). These video glasses can be used for mob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/32
CPCG09G3/3291G09G2300/0814G09G2320/0626H05B37/02G09G2300/0852G09G2300/0861G09G2310/0262G09G2300/0809G09G2310/0251G09G3/2018G09G3/3233G09G3/3258G09G2320/064G09G2330/04G09G2320/0633H05B47/10G09G3/32
Inventor 丹尼尔·克雷耶托马斯·普雷斯博格尔
Owner FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
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