Sloped Insulating Layer for OLED AR Display Brightness
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Solution Overview
Problem
Existing display devices, particularly augmented reality devices, face challenges in minimizing luminance loss and maintaining high brightness due to the constraints of optical lens size and light emission angles, which affect the efficiency and comfort of the device.
Innovation Solution
The implementation of a display panel with an insulating layer having sloped surfaces and a color filter layer positioned to align with multiple subpixels, allowing for optimized light emission angles and reduced luminance loss, enabling the miniaturization of the optical lens while maintaining high brightness and preventing abrupt changes in brightness and chromatic characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the optical lens size is reduced for miniaturization, then the device becomes more compact and wearable, but luminance loss increases and brightness decreases
Solution Approach 1:
The insulating layer is designed with different thicknesses at different locations (thicker at edges, thinner at center) to create localized optical path adjustments. This local variation in layer thickness compensates for light emission angle variations across the display panel, maintaining brightness uniformity even with a miniaturized optical lens
Solution Approach 2:
The patent changes the physical parameter of the insulating layer (thickness distribution) to optimize light emission characteristics. By controlling the thickness parameter spatially, the system achieves improved luminance uniformity and reduced loss while using a smaller optical lens
2Ease of manufacture
If the display panel uses a flat insulating layer structure, then the manufacturing process is simpler, but luminance loss occurs due to suboptimal light emission angles
Solution Approach 1:
Rather than using a uniformly thick insulating layer, the patent implements a spatially varying thickness profile (thicker at edges, thinner at center). This local differentiation optimizes light emission angles across different regions of the display panel, reducing luminance loss while remaining compatible with standard manufacturing processes
Solution Approach 2:
The insulating layer transitions from a two-dimensional uniform structure to a three-dimensional varying thickness structure. This dimensional change allows the layer to function both as an electrical insulator and as an optical element that controls light emission angles, reducing luminance loss without adding separate optical components
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 solution effectively reduces luminance loss and maintains high brightness, making the display panel suitable for augmented reality devices that require high performance and comfort, and allows for the miniaturization of the optical lens, enhancing user experience and device functionality.
Implementation Method 1
an organic light-emitting diode on the insulating layer
Data Source
AI summary
A display device and an eyeglasses-like augmented reality device using the same are provided. The display device includes a display panel including a lower substrate and an upper substrate and having a display area, an insulating layer that lies over the lower substrate and has a sloped surface in the display area, and an organic light-emitting diode on the insulating layer. The insulating layer has different slopes for different positions in the display area.