Organic electroluminescent screen body and preparation method thereof

Abstract

The invention discloses an organic electroluminescent screen body and a preparation method thereof. One or more injection electrodes are bound to the periphery of the OLED screen body, electrically connected with corresponding electrode inflow areas arranged in a light-emitting area of the OLED screen body through light-emitting area leads or connecting wires and used for inputting currents into all local light-emitting areas in the OLED screen body. According to the invention, independent current control can be carried out on each injection electrode or a plurality of different injection electrodes, so that the purpose of controlling screen body brightness distribution is achieved. According to the preparation method provided by the invention, the screen body brightness imbalance area canbe searched, the control of the light-emitting uniformity distribution of the light-emitting area of the OLED screen body is realized by adjusting the current input of the injection electrode. The problem of uneven brightness distribution caused by difference of actual current input of each local light-emitting area in the light-emitting area of the OLED screen body is solved, and the OLED screenbody brightness compensation method can be applied to ex-factory detection to perform brightness compensation on the screen body without TFT control.

Description

technical field [0001] The invention relates to the technical field of OLED devices, in particular to an organic electroluminescence screen body and a preparation method thereof. Background technique [0002] OLED light-emitting screen body, because it is a current-driven light-emitting device, the luminous intensity is proportional to the size of the current injection. In order to obtain the change of the real picture, PM or AM-TFT two driving methods are generally used for fine control of pixelation. [0003] Both PM and AM-TFT driving methods are based on the concept of independent pixelation to control the real picture or brightness. But this way of thinking brings the following new problems: pixelated design brings about lower aperture ratio and more complex process, higher continuous picture requirements require higher number of pixels (high resolution), circuit control becomes Extremely complex etc. [0004] For general light sources, in order to improve the overal...

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Problems solved by technology

But this way of thinking brings the following new problems: pixelated design brings about lower aperture ratio and more complex process, higher continuous picture requirements require higher number of pixels (high resolution), circuit control becomes unusually complex etc.

[0005] figure 1 It is an equivalent circuit diagram of an OLED light-emitting screen in the prior art. Due to the shape of the screen, the electrode material, the organic charge transport material, and the non-uniform distribution of the resistance of the electrode wiring inside the screen (due to uneven line width, thickness, etc.), Influenced by many factors such as uneven distribution of charge transmission inside the screen (inhomogeneous evaporation thickness and concentration), the uniform distribution of light emission of the screen has always been a problem that plagues the manufacture and use of OLEDs. The input current is transmitted to the equivalent light-emitting diode unit , the actual current varies greatly

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