Organic EL Display Electrode Concavities for Film Thickness Control
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Solution Overview
Problem
Existing organic electroluminescence (EL) display panels face challenges in finely adjusting the film thickness of the organic layer for each luminescent color, which affects luminous efficiency, as the wet method used for manufacturing often requires uniform ink distribution across sub-pixels of different colors, making precise adjustments difficult.
Innovation Solution
The solution involves forming electrode plates with concavities of varying volumes to allow for precise control of the organic functional layer thickness by adjusting the volume of ink entering these concavities, enabling finer adjustments in film thickness to match the wavelength of each luminescent color, thereby improving luminous efficiency and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the wet method is used to spray ink containing organic material and solvent, then it is relatively easy to form the organic layer or light-emitting layer even in large panels, but it is difficult to finely adjust the film thickness of the organic layer in the sub-pixel of each luminescent color
Solution Approach 1:
The patent applies local quality by providing different volumes of ink to sub-pixels of different luminescent colors. Specifically, the ink ejection amount is adjusted according to the wavelength characteristics of each color (red, green, blue), allowing the organic layer film thickness to be locally optimized for each color rather than using a uniform thickness across all sub-pixels. This resolves the contradiction by enabling color-specific thickness control while maintaining the ease of wet manufacturing method.
Solution Approach 2:
The patent changes the parameter of ink ejection volume based on the luminescent color of each sub-pixel. By adjusting the amount of ink sprayed (a controllable parameter) according to the specific wavelength requirements of red, green, and blue sub-pixels, the method achieves fine control over organic layer thickness for each color while still using the simple wet spraying process.
2Stability of the object's composition
If the same number of drops of ink is ejected into each element, then the film thickness of the organic layer is the same in all regions for forming elements of the same color, but it is difficult to finely adjust the film thickness to match the wavelength of each luminescent color
Solution Approach 1:
The patent implements local quality by differentiating the ink treatment for each luminescent color. Instead of applying the same number of drops to all sub-pixels, the method provides different volumes of ink to red, green, and blue sub-pixels based on their specific wavelength characteristics. This allows each color to have its organic layer thickness locally optimized while maintaining compositional stability within each color group.
Solution Approach 2:
The patent changes the ink volume parameter according to the luminescent color type. By adjusting the ejection amount of ink for each color (red, green, blue) while maintaining uniformity within each color category, the method achieves both color-specific precision and intra-color consistency, resolving the contradiction between uniformity and fine control.
Data Source
AI summary
A display panel and method of manufacturing a display panel. A plurality of contact holes penetrate through an interlayer insulation film and have wiring lines connecting first electrode plates and second electrode plates with a thin-film transistor layer. The first electrode plates and the second electrode plates each include at least one concavity. The at least one concavity included in each of the first and second electrode plates coincide with the plurality of contact holes. A total volume of the at least one concavity in any of the first electrode plates is larger than a total volume of the at least one concavity in any of the second electrode plates, while a volume of a portion of the first organic functional layer corresponding to any of the first electrode plates at least approximates a volume of the second organic functional layer corresponding to any of the second electrode plates. A portion of the first organic functional layer entered into the at least one concavity in any of the first electrode plates is larger than a portion of the second organic functional layer entered into the at least one concavity in any of the second electrode plates, so that in locations other than the at least one concavity in the first electrode plates and the second electrode plates, the first organic functional layer is thinner than the second organic functional layer.