Patterned Electrodes for OLED Light Panels
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Solution Overview
Problem
Existing OLED light panels face challenges in achieving uniform brightness and color across large areas due to limitations in current electrode designs, which often result in reduced aperture ratio and inefficient light emission from bus lines.
Innovation Solution
The use of patterned electrodes with varying reflectance or transmittance across different positions on the panel, allowing for controlled brightness and color variation by optimizing the micro-cavity effect, while maintaining a high aperture ratio through the use of semi-transparent and reflective materials like Ag and IZO.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If conventional electrode designs with bus lines are used, then electrical connectivity is achieved, but aperture ratio is reduced and luminance uniformity deteriorates
Solution Approach 1:
The invention extracts and removes the bus lines from the electrode structure entirely. Instead of having continuous conductive layers with bus lines, the patent uses segmented transparent conductive oxide patterns that eliminate the need for separate bus line structures, thereby increasing aperture ratio while maintaining electrical connectivity through the patterned design.
Solution Approach 2:
The patent applies local quality by creating non-uniform patterned regions of transparent conductive oxide with varying geometries and densities across different areas of the electrode. This allows different regions to have optimized electrical properties and light transmission characteristics, achieving both high aperture ratio and improved luminance uniformity through spatially varying local structures.
2Area of moving object
If transparent conductive oxide patterns are used to increase aperture ratio, then light emission area is increased, but electrical conductivity may be reduced
Solution Approach 1:
The invention employs parameter changes by systematically varying the geometric parameters of the transparent conductive oxide patterns, including line width, spacing, thickness, and density distribution. These parameter optimizations ensure that the patterns provide sufficient electrical conductivity while maximizing the aperture ratio, achieving a balance between electrical performance and light transmission.
Solution Approach 2:
The patent uses composite electrode structures combining transparent conductive oxide patterns with other conductive materials or layered configurations. This composite approach enhances electrical conductivity while maintaining the high aperture ratio benefit of the patterned transparent conductive oxide, resolving the contradiction between light emission area and electrical conductivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables 100% aperture ratio and improved luminance uniformity across large OLED light panels, with controlled color and brightness variation, enhancing the visual appeal and efficiency of OLED lighting.
Implementation Method 1
achieving controlled brightness and color variation by optimizing the micro-cavity effect
Implementation Method 2
OLEDs make use of thin organic films that emit light when voltage is applied across the device
Data Source
AI summary
A first device may be provided in some embodiments. The first device may comprise a substrate, a first emissive region, and a second emissive region, where the first emissive region and the second emissive region may comprise a contiguous area. The first device may further comprise a first electrode disposed over the substrate that extends across the first and the second emissive regions, and an organic layer disposed over the substrate that extends across the first and second emissive regions, where the organic layer comprises the same emissive material across the first and the second emissive regions. The first device may further include a second electrode disposed over the substrate that extends across the first and second emissive regions, where the second electrode includes a patterned layer of conductive material that is disposed in the first emissive region and that is not disposed in the second emissive region.