OLED Display Insulating Layer Thickness Gradient for Brightness Uniformity
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Solution Overview
Problem
The manufacturing process of two-layer source/drain structures in OLED display devices is complex and costly, leading to uneven brightness and a limited application range due to voltage and current variations across the display area.
Innovation Solution
A display device with a gradually decreasing thickness of the second insulating layer from the integrated circuit area towards the non-display area, forming storage capacitors with varying capacitance values to compensate for current differences and improve brightness uniformity, while simplifying the manufacturing process and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a two-layer source/drain structure is used to control voltage drop, then brightness uniformity is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent changes the physical parameter of the insulating layer thickness to compensate for voltage drop. By making the insulating layer thickness gradually decrease from the integrated circuit area toward the display area edge, the capacitance of storage capacitors varies spatially, which compensates for the IR drop and achieves brightness uniformity without requiring a complex two-layer source/drain structure.
2Illumination intensity
If a two-layer source/drain structure is used to control voltage drop, then brightness uniformity is improved, but production cost increases
Solution Approach 1:
The patent uses parameter change of the insulating layer thickness to achieve brightness uniformity. This approach avoids the need for additional source/drain layers and complex manufacturing processes, thereby reducing production cost while maintaining brightness uniformity across the display area.
3Power
If voltage and current are increased near the integrated circuit area, then driving capability is improved, but brightness unevenness increases
Solution Approach 1:
The patent applies local quality by creating spatial variation in the insulating layer thickness. The thicker insulating layer near the integrated circuit area provides higher capacitance to compensate for the higher current and voltage, while the thinner insulating layer at the display area edge provides lower capacitance appropriate for lower current and voltage. This local differentiation achieves both driving capability and brightness uniformity.
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
The solution achieves uniform illumination by gradually decreasing voltage and current across the display area, simplifying the manufacturing process, reducing production costs, and expanding the application range of OLED display devices.
Implementation Method 1
a thickness of the second insulating layer is gradually decreased from a vicinity of the integrated circuit area toward a direction away from the integrated circuit area
Data Source
AI summary
A display device and a manufacturing method thereof. The display device includes a display area and a non-display area. The display area includes a substrate, a first insulating layer, a first gate layer, a second insulating layer, and a second gate layer. The non-display area includes an integrated circuit area, and a thickness of the second insulating layer is gradually decreased from a vicinity of the integrated circuit area toward a direction away from the integrated circuit area. The manufacturing method of the display device includes a preparation step of disposing a substrate, a preparation step of disposing a first insulating layer, a preparation step of disposing a first gate layer, a preparation step of disposing a second insulating layer, and a preparation step of disposing a second gate layer.