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A high stability oled lighting screen body

A high-stability, high-resistance technology, applied in the field of OLED screens, can solve the problems of less than this order of magnitude, the effect of short-circuit prevention is not obvious, and high heat, etc., to achieve the effect of preventing short-circuits in the burn area and improving the reliability of the screen.

Active Publication Date: 2021-03-26
GUAN YEOLIGHT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • A high stability oled lighting screen body
  • A high stability oled lighting screen body
  • A high stability oled lighting screen body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072]Set the number of divided pixels of the OLED screen to 10,000, the operating voltage of the OLED screen to 6V, and the corresponding current to 100mA, respectively connect 30Ω, 60Ω, 200Ω, and 600Ω fuses in series to each pixelated OLED circuit component, each The average passing current J of each pixel is 0.01mA. When there is a short-circuit defect point, the corresponding short-circuit point pixel current I of the short-circuit defect point is designed according to different resistances. s 66.6mA, 50.0mA, 23.1mA, 9.1mA, the corresponding I s The / J coefficients are 6667, 5000, 2308, 909 respectively; I s The smaller the value of / J, the more difficult it is for the fuse to achieve the fusing condition. The experiment shows that the 600 Ω fuse cannot achieve the purpose of fusing before the whole screen burns out. At the same time, due to Joule heat, the surrounding pixel areas of the fuse are about 50um, 100um, >500um in diameter, and the screen body fails. It can be ...

Embodiment 2

[0074] Set the number of divided pixels of the OLED screen to 100, the operating voltage to 6V, and the corresponding current to 100mA. 30Ω, 60Ω, 200Ω, and 600Ω fuses are connected in series to each pixelated OLED circuit component. The average of each pixel The passing current is 1mA. When there is a short-circuit defect point, the short-circuit point pixel current Is corresponding to the short-circuit defect point according to different resistance designs is 67.0mA, 50.4mA, 23.3mA, 9.22mA, and the corresponding Is / J coefficients are respectively The values ​​are 67.0, 50.4, 23.3, 9.22; the smaller the Is / J value, the more difficult it is for the fuse to achieve the fusing condition. The experiment shows that the 600Ω fuse cannot achieve the purpose of fusing before the whole screen burns out. At the same time, due to Joule heat, the surrounding pixel areas of the fuse are about 50um, 100um, >500um in diameter, and the screen body fails. It can be seen that increasing the Is / J...

Embodiment 3

[0104] Anti-short circuit of the screen applied to the small area screen (small current 10-30mA)

[0105] The OLED screen device voltage is 6V, the current density of a single pixel is 0.0126mA, and there are 800, 1600, and 2400 pixels respectively, and the corresponding area is 144-433mm 2 , the low-resistance protector uses metallic conductive material with a melting point of 800°C, which uses a metal conductor with a wire width of 0.1um or a wire thickness of 10nm, and an insulating material layer with a melting point of 400°C is provided on the substrate under the low-resistance protector. The resistance of the low-resistance protector in the unit is negligible; the high-resistance protector is designed with a sheet resistance of 50Ω / □ with different aspect ratios, and the corresponding equivalent resistance is 500, 1000, 5000, 10000Ω; the short-circuit defect point equivalent The impedance settings are A-0, B-100, C-500, D-1000, and E-5000Ω. The experimental results are s...

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Abstract

The invention discloses a high-stability OLED lighting screen body, on which an auxiliary electrode, an insulator and a plurality of circuit protection devices are arranged, and the circuit protection device corresponds to the pixelated first electrode in the OLED circuit assembly one by one. connected, and all the circuit protection devices are electrically connected to the auxiliary electrodes respectively, the insulator covers the auxiliary electrodes, the circuit protection devices and the area between the circuit protection devices and the OLED circuit components, and the screen body also includes a first circuit connected in series with each circuit protection device Two resistor protectors, the loop protection device is used to protect the screen body of the short-circuit point pixels with low resistance defects in the pixelated load circuit connected in series, and the second resistor protector is used to protect the pixelated OLED circuit components. The short-circuit point pixel of the resistance defect is used for screen protection. The present invention realizes short-circuit protection for the screen body against different defect states occurring in the OLED circuit assembly through the serial connection of the circuit protection device and the second resistance protector, and improves the reliability of the screen body.

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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L27/32
CPCH10K59/122H10K59/1315
Inventor 李育豪朱映光谢静于倩倩郭立雪胡永岚
Owner GUAN YEOLIGHT TECH CO LTD
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