OLED White Subpixel Insulative Layer Thickness Variation
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Solution Overview
Problem
In the manufacture of OLED display devices, particularly in WRGB technology, the smaller vertical distance between the bottom layer wiring and the first electrode in the white sub pixel area can lead to short circuits or overcurrents due to impurities like photo residual glue or unclean etching, causing manufacturing difficulties and brightness deterioration.
Innovation Solution
The solution involves a specific structure where the thickness of the second insulative layer above the bottom layer wiring in the white sub pixel area is made larger than in other areas, increasing the vertical distance between the bottom layer wiring and the first electrode, and incorporating a spacer layer between adjacent sub pixel areas to prevent short circuits and overcurrents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the vertical distance between the bottom layer wiring and the first electrode in the white sub pixel area is reduced to simplify structure, then the device complexity is reduced, but the reliability deteriorates due to short circuits or overcurrents caused by impurities
Solution Approach 1:
The patent applies local quality by creating a varying thickness second insulative layer where the thickness is specifically increased in the white sub pixel area compared to other areas. This localized structural modification provides enhanced insulation precisely where needed (white sub pixels with smaller vertical distances) without unnecessarily complicating the entire device structure, thus resolving the contradiction between device complexity and reliability.
2Reliability
If the vertical distance between the bottom layer wiring and the first electrode is increased to prevent short circuits, then the reliability is improved, but the device complexity increases due to varying layer thicknesses
Solution Approach 1:
Rather than uniformly increasing the vertical distance across all sub pixels (which would unnecessarily increase device complexity), the patent applies local quality by making the second insulative layer thicker only in specific areas (white sub pixel areas) where the vertical distance is smaller. This targeted approach improves reliability precisely where needed while minimizing the increase in overall device complexity.
3Reliability
If the thickness of the second insulative layer is increased in the white sub pixel area to prevent short circuits, then the reliability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies parameter changes by modifying the thickness parameter of the second insulative layer specifically in the white sub pixel areas. By changing this physical parameter (thickness) in targeted regions, the patent enhances reliability without requiring complex manufacturing processes, as the thickness variation can be achieved through standard photolithography and deposition techniques with appropriate parameter adjustments.
Data Source
AI summary
The present invention provides an OLED display device and a manufacture method thereof. By locating a thickness of a part of the second insulative layer correspondingly positioned above the bottom layer wiring in the white sub pixel area is larger than a thickness of other part of the second insulative layer in the white sub pixel area, increase a vertical distance from the bottom layer wiring to the first electrode in the white sub pixel area, and thus, the short circuit, the overcurrent between the first electrode and the bottom layer wiring of the white sub pixel area can be prevented. The manufacture method of the OLED display device is simple, easy for operation, and the manufactured OLED display device can prevent the short circuit or the overcurrent between the first electrode and the bottom layer wiring of the white sub pixel area occur and raise the manufacture yield of the OLED display device.