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Aging method for inorganic electroluminescence display device

A display and luminescent technology, which is applied in the field of inorganic electroluminescent display to make the inorganic electroluminescent display aging, and can solve the problem that it is difficult to avoid point-like spark breakdown, the dielectric layer withstands voltage drop, and it is difficult to improve the device yield rate. To achieve the effect of suppressing extended ignition, reducing environmental and equipment requirements, and improving yield

Active Publication Date: 2011-10-05
INESA ELECTRON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the high-voltage drive, the device relies on the high-voltage dielectric film layer to protect the device from breakdown and burnout, but it is difficult to avoid the defects (such as pinholes) in the dielectric film layer during the aging process of the newly manufactured device. Point-like spark breakdown phenomenon
In the nitrogen protective atmosphere, if the ignition of some points is serious or the ignition time is relatively long, the dielectric layer near the ignition point will be damaged and the withstand voltage will be reduced, so the ignition will be affected by the dielectric layer. The nearby area of ​​the loss expands and develops into an extended ignition, which eventually leads to the generation of disconnection (such as figure 1 shown)
Therefore, the current device aging method is difficult to improve the yield of the device, and in the field of flat panel display, the yield of the mass production process is the key to determining the cost of the product

Method used

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  • Aging method for inorganic electroluminescence display device
  • Aging method for inorganic electroluminescence display device
  • Aging method for inorganic electroluminescence display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In this embodiment, a yellow light inorganic electroluminescent display with ZnS:Mn as the light emitting layer is selected. The structure of the inorganic electroluminescent display includes a glass substrate, a transparent lower electrode, a lower dielectric layer, a light emitting layer, an upper dielectric layer, and an upper electrode. The lower electrode layer is ITO, and the upper electrode is aluminum or other metals. After the device is fabricated, it is pre-aged in a dry oxygen-containing atmosphere. If the light-emitting layer is an oxide, it can also be placed in the air for pre-aging. After pre-aging for a period of time, the package is subjected to subsequent aging in dry nitrogen, and finally the circuit is bonded.

[0026] In this embodiment, the aging steps of the inorganic electroluminescent display are as follows:

[0027] After the luminous screen is made, it is placed in a dry sealed box, the electrode leads are drawn out, and an air inlet and an...

Embodiment 2

[0034] A yellow inorganic electroluminescent display with ZnS:Mn as the light emitting layer has a size of 96mm*72mm, 120 rows and 480 columns. The electrode in the column direction is the bottom electrode ITO, and the electrode in the row direction is the upper electrode aluminum. The top electrode aluminum was evaporated by electron beam to a thickness of 150nm. After the device was fabricated, it was directly packaged in a glove box in dry nitrogen. Then add pulse voltage for aging, the pulse width is 10 microseconds, the frequency is 200 Hz, and the voltage is 210V. After half an hour of aging, the pulse width is increased from 10 microseconds to 30 microseconds, and then aged for 24 hours. After aging, nearly 1 / 4 of the rows and columns were disconnected, Figure 4 Shown is a photograph of broken wires after aging under a microscope for extended sparks.

Embodiment 3

[0036] The same inorganic electroluminescent display as in Example 2 was selected for use. After the device is manufactured, it is placed in the air and subjected to pulse voltage aging, and the applied voltage is the same as that in Example 2. After aging for 24 hours, the screen did not appear disconnected, but the brightness decayed to zero. Figure 5 It is the curve of the brightness changing with time during the aging process of the device, and the curve shows that the brightness decays rapidly because the light-emitting layer is affected by the moisture in the air.

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Abstract

A method of aging an inorganic electroluminescent display belongs to the flat display technical field, which is that a display is placed inside a closed container which contains oxygenous atmosphere; two wires are used for inducing electrodes, and then two electrode wires are electrified; the applied voltage is more than the pulse voltage of the threshold voltage of the display for pre-aging; when the fire striking in the display is over, the display is sealed in protective atmosphere for the follow-up aging. If sulfide is used as a luminescent layer, a part needs to be placed in dry oxygenous mixed gas or pure oxygen for aging. The invention puts the display in the oxygenous atmosphere, so the electrodes are oxygenated easily, when the fire is struck, which prevents the occurrence of extended fire striking, reduces the occurrence of broken lines; moreover and improves the reliability and the finished product rate of the display.

Description

Technical field: [0001] The invention belongs to the technical field of flat panel display, and in particular relates to an inorganic electroluminescent display, in particular to a method for aging the inorganic electroluminescent display. Background technique: [0002] Inorganic electroluminescent flat-panel displays have the characteristics of all solid state, light weight, thin thickness, large viewing angle, and simple structure. They can be used in harsh environments such as low temperature and vibration, and have broad application prospects. The thin-film inorganic electroluminescent flat-panel display uses a lead-free oxide film as the dielectric layer. Compared with the thick-film inorganic electroluminescent display, it has high resolution, does not contain materials that pollute the environment such as lead, and has a simple manufacturing process. Etc. However, since the device is driven by high-voltage pulses, the thin-film dielectric layer is easy to break down ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B33/10
Inventor 楼均辉张羿周团团刘红君肖田
Owner INESA ELECTRON