Display Pixel Optics With High-Refractive Grid Layer for Angular Color Control
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Solution Overview
Problem
Conventional display devices face challenges in achieving improved image quality due to variations in light characteristics resulting from their layered structures, leading to deteriorated display quality, especially in terms of miniaturization, portability, and light output performance.
Innovation Solution
A display device design incorporating a base substrate with a pixel defining layer, a light emitting structure, a thin film encapsulation layer, a touch electrode, an insulating pattern with a second opening, a high refractive layer having grid patterns on its surface, and an optical layer, which enhances light output performance and reduces white angular difference deviation by scattering light obliquely emitted from the edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a layered structure is used to constitute pixels, then the display device achieves miniaturization and light weight, but light characteristics vary leading to deteriorated display quality
Solution Approach 1:
The patent applies local quality by introducing a high refractive layer with grid patterns specifically in the non-emission area, while keeping the emission area structure different. This localized modification improves light extraction in specific regions without affecting the overall miniaturized structure, resolving the contradiction between small size and light output performance
Solution Approach 2:
The patent adds a vertical dimension solution by stacking multiple layers (pixel defining layer, encapsulation layer, high refractive layer with grid patterns) to improve light extraction efficiency. This multi-layer approach allows the device to maintain small footprint while enhancing optical performance through vertical structuring
2Volume of moving object
If a layered structure is used to constitute pixels, then the display device achieves miniaturization and light weight, but display quality deteriorates due to varying light characteristics
Solution Approach 1:
The high refractive layer with grid patterns is applied locally in the non-emission area to control light extraction characteristics. This localized intervention improves image quality by reducing white angular difference without requiring precision control over the entire pixel structure, making manufacturing more feasible
Solution Approach 2:
The patent changes the refractive index parameter by introducing a high refractive layer (refractive index 1.7-1.9) compared to the pixel defining layer. This parameter change improves light extraction efficiency and reduces viewing angle dependence, enhancing image quality in the miniaturized structure
3Ease of manufacture
If conventional layered structures are used, then manufacturing is simpler, but light obliquely emitted from edges causes white angular difference deviation
Solution Approach 1:
The grid patterns are confined to the non-emission area, leaving the emission area structure relatively simple for manufacturing. This localized approach addresses white angular difference deviation without complicating the overall manufacturing process significantly
Solution Approach 2:
The high refractive layer acts as an intermediary between the pixel defining layer and the external environment. It mediates light extraction by providing a refractive index transition that reduces white angular difference deviation while maintaining manufacturing feasibility
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 improves light output performance in the forward direction and reduces the deviation of white angular difference, thereby enhancing the display's image quality and viewing angle characteristics.
Implementation Method 1
a high refractive layer disposed on the insulating pattern... The high refractive layer may include grid patterns disposed on a top surface of the high refractive layer... improves light output performance in the forward direction and reduces the deviation of white angular difference by scattering light obliquely emitted from the edges
Data Source
AI summary
A display device includes a base substrate, a pixel defining layer disposed on the base substrate and including a first opening, a light emitting structure disposed in the first opening of the pixel defining layer, a thin film encapsulation layer disposed on the light emitting structure, a touch electrode disposed on the thin film encapsulation layer, an insulating pattern disposed on the touch electrode and including a second opening which overlaps the first opening, and a high refractive layer disposed on the insulating pattern, the high refractive layer including a plurality of grid patterns disposed on a top surface of the high refractive layer, and a refractive index higher than a refractive index of the insulating pattern.