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Electronic device having low background luminescence, a black layer, or any combination thereof

A technology for electronic devices and black layers, which can be used in electric solid-state devices, photovoltaic power generation, electrical components, etc., and can solve problems such as increased module thickness and cost.

Inactive Publication Date: 2008-12-24
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, circular polarizers can block about 60% of the light emitted from OLEDs and significantly increase module thickness and cost

Method used

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  • Electronic device having low background luminescence, a black layer, or any combination thereof
  • Electronic device having low background luminescence, a black layer, or any combination thereof
  • Electronic device having low background luminescence, a black layer, or any combination thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0099] Example 1 demonstrates that the composition, thickness, or both of one or more layers in the cathode may not be well suited to achieve low L 背景 . An electronic device can be fabricated having a cathode comprising a Sm layer therein. The cathode can comprise an interlayer of Ba / Al / Sm / Al or LiF / Al / Sm / Al, depending on whether Ba or LiF is used as the low work function layer. 6 to 8 include graphs of luminance, CIEy (color) and reflectance for a cathode comprising a Sm layer. Both brightness and color properties are acceptable for different thicknesses of Sm layers, but the minimum reflectance is relatively high and occurs at frequencies in the blue light spectrum (around 470 nm). The minimum reflectance is greater than 20%. The human eye is less sensitive to radiation within the blue light spectrum (400-500 nm) compared to the green light spectrum (500-600 nm).

Embodiment 2

[0101] Example 2 demonstrates that, compared to the cathode of Example 1, the composition, thickness, or both of one or more layers in the anode are critical to achieving a low L 背景 effect is greater. Electronic devices can be fabricated with a cathode comprising a Ru or Cr layer in the anode. The anode may include an ITO / Ru / ITO or ITO / Cr / ITO interlayer. Figures 9 to 11 include graphs of luminance, CIEy and reflectance for anodes comprising Ru or Cr layers. Brightness was not as good as the cathode of Example 1. However, the color is improved and the minimum reflectance is significantly lower and is at very low values ​​in the eye sensitivity range corresponding to the green light spectrum (wavelength range 500-600 nm). The minimum reflectance is less than 10%, and in a particular embodiment, less than 5%. Therefore, the anode of Example 2 achieves L 背景 Lower cathode than Example 1.

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PUM

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Abstract

An electronic device or a process of forming an electronic device can include a first electrode configured to achieve low Lbackground or include a black layer. An electronic device can include a substrate including a user surface. The electronic device can also include a first electrode that includes a first layer, a second layer, and a third layer. The second layer can lie between the first and third layers, and the first electrode can be configured to achieve low Lbackground. The electronic device can further include a second electrode lying farther from the user surface as compared to the first electrode. In another embodiment, a first electrode can include a first layer and a second layer. The second layer can set the work function of the electrode, and the second layer can be a black layer. Processes can be used to form the electronic devices.

Description

field of invention [0001] The present invention relates generally to electronic devices, and more particularly, to electronic devices having low background emission, black layers, or any combination thereof. Background technique [0002] Electronic devices may include liquid crystal displays ("LCD"), organic light emitting diode ("OLED") displays, and the like. LCD and OLED displays are promising approaches for flat panel display applications. Reflected ambient radiation can be a problem for display users. If the thickness of one or more materials used for the internal electrodes of the display is greater than 20 nanometers, the material may have a mirror-like reflectivity. High reflectivity may result in poor readability or low contrast when the device is used in bright environments, especially outdoors. [0003] One way to try to solve the reflection problem is to place a circular polarizer in front of the OLED display panel. However, a circular polarizer can block abo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J1/62
CPCY02E10/549H01L2924/0002H10K30/82H10K59/8792H10K59/80517H01L2924/00H01L31/022466H10K50/86H10K50/816H10K50/865
Inventor S·普拉卡什
Owner EI DU PONT DE NEMOURS & CO