Display Panel Inclined Optical Layers Control Light Emission Angle
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Solution Overview
Problem
Existing display devices struggle to effectively control the angle of emitted light, which affects image quality and user experience, especially in head-mounted display devices where light emission direction is critical.
Innovation Solution
A display panel design that includes a substrate, a pixel circuit layer, a light emitting element layer, an overcoat layer with a first refractive index, and a cover window with a second refractive index greater than the first, where both the overcoat layer and the cover window feature inclined surfaces. The inclination angles of these surfaces vary between the central and edge areas of the display panel, allowing for controlled light emission angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional display panel with flat surfaces is used, then the structure is simple and manufacturing is easy, but the angle of emitted light cannot be controlled effectively
Solution Approach 1:
The patent applies local quality by creating different inclination angles in different regions of the overcoat layer and cover window. The central region has a first inclination angle while the edge region has a second inclination angle, allowing localized control of light emission characteristics to achieve uniform display quality across the panel
Solution Approach 2:
The patent uses curved inclined surfaces instead of flat surfaces to control light emission. The overcoat layer and cover window feature inclined surfaces with specific curvature profiles that refract light at desired angles, transforming the conventional flat surface into a light-controlling optical element
2Manufacturing precision
If uniform light emission angle is achieved across the entire panel, then image quality improves, but the manufacturing process becomes more complex
Solution Approach 1:
The patent segments the light emission control function into two distinct components: the overcoat layer with inclined surfaces and the cover window with inclined surfaces. Each component handles a portion of the light refraction, dividing the complex task of achieving uniform light emission angles across different panel regions into manageable manufacturing steps
Solution Approach 2:
The patent controls light emission angles by changing the refractive index parameter of different layers. The overcoat layer has a first refractive index and the cover window has a second refractive index, allowing precise control of light refraction angles through material selection rather than complex structural design
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 design enables precise control over the angle of emitted light, improving image quality and user experience by ensuring uniform light distribution across the display panel, particularly in head-mounted display devices.
Implementation Method 1
an overcoat layer disposed on the light emitting element layer and having a first refractive index; and a cover window disposed on the overcoat layer and having a second refractive index greater than the first refractive index, wherein at least one of the overcoat layer and the cover window includes a plurality of inclined surfaces
Data Source
AI summary
Embodiments of the present disclosure provide a display panel including: an overcoat layer disposed on a light emitting element layer and having a first refractive index; and a cover window disposed on the overcoat layer and having a second refractive index greater than the first refractive index, wherein at least one of the overcoat layer and the cover window includes a plurality of inclined surfaces, and inclination angles of the plurality of inclined surfaces in a central area are different from those in an edge area. The display panel, the manufacturing method thereof, and the head-mounted display device including the same according to the embodiments of the present disclosure May control the angle of emitted light.