High-stability OLED illuminating screen body

Abstract

The invention discloses a high-stability OLED illuminating screen body. The screen body comprises a substrate and a plurality of pixilated OLED circuit components, an auxiliary electrode and a plurality of circuit protection devices are further arranged on the substrate, the circuit protection devices are electrically connected with first pixilated electrodes in the OLED circuit components in a one-to-one correspondence mode, and all the circuit protection devices are electrically connected with the auxiliary electrodes separately; an insulator covers the auxiliary electrode, the circuit protection devices and the area between the circuit protection devices and the OLED circuit components; when current passing through short-circuit point pixels in the OLED circuit components is larger thana preset fusing threshold in the circuit protection devices, the circuit protection devices corresponding to the short-circuit point pixels are in a circuit fusing state, and the OLED circuit components corresponding to the short-circuit point pixels are isolated from the OLED circuit components corresponding to normal pixels. According to the screen body, the OLED circuit components with defectscan be isolated and controlled, defect protection is carried out on the OLED illuminating screen body in real time, and the reliability of the screen body is improved.

Description

technical field [0001] The invention relates to the technical field of OLED screens, in particular to a highly stable OLED lighting screen. Background technique [0002] In the manufacturing process of the OLED screen, there are inevitably defects such as dust particles, burrs, pinholes, cracks, etc., and the distance between the anode and the cathode of the OLED screen is usually very small (about tens to hundreds of nanometers). As a result, in this state, the anode and cathode may come into direct contact causing a defect (called a short point), or the organic layer between the anode and cathode may become thinner than other locations. When the OLED device is working, the current tends to pass through this short-circuit point rather than other locations, so that heat accumulates at this short-circuit point, thereby causing damage to the quality and reliability of the entire OLED device. [0003] Under other conditions being the same, the larger the light-emitting area of...

AI Technical Summary

Problems solved by technology

At the same time, there are two important factors that must be considered in this kind of anti-short circuit system, (1) the pixels of the screen body should be enough (that is, n cell )(2) The anti-short circuit resistance should be as large as possible (that is, R cell-spl ); if the above two necessary conditions cannot be achieved, the anti-short-circuit effect will not be obvious, and the short-circuit point will generate high heat due to high current (P=I 2 R; P=power, I=current, R=resistance), and then reduce its reliability

The experiment pointed out that the above-mentioned anti-short circuit system is suitable for the power supply of "constant voltage", that is, the current can have a large range of changes, but most power supply devices cannot achieve it, and the OLED lighting screen is supplied with a "constant current" power supply The above-mentioned short-circuit protection mechanism causes a large amount of failure current due to the short-circuit point (that is, the current passing through the short-circuit point (effectively supplying normal OLED device current + failure current of the short-circuit point = total output current of the constant power supply)) which affects the photoelectric performance of the screen. decline

Among them, the resistance of the loop protection device is large enough to match the equivalent resistance of the light-emitting pixel, and the circuit protection design in the form of series resistance can be achieved, but the value of the equivalent resistance of the light-emitting pixel is usually tens of thousands to hundreds of thousands of ohms after calculation. , the resistance of the circuit protection device is usually far less than this order of magnitude, so a high proportion of short-circuit current will pass through the short-circuit point, resulting in a significant change in the overall light efficiency of the screen

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