Multilayer Pixel-Defining Trench Display for 3000 PPI
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Solution Overview
Problem
Existing head-mounted displays face challenges in providing high-resolution images due to the limitations of current display technologies, particularly in achieving resolutions of 3000 PPI or higher.
Innovation Solution
The display device incorporates an insulating layer on a substrate with a first electrode, pixel defining layers, and a trench that penetrates these layers. The light emitting stack is positioned on the first electrode and pixel defining layers, with a second electrode on top, and the trench design ensures a specific width and height configuration to enhance light emission and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional display technologies are used in head-mounted displays, then device complexity is reduced, but manufacturing precision and resolution cannot achieve 3000 PPI or higher
Solution Approach 1:
The display device is segmented into multiple functional layers including substrate, insulating layer, first electrode, pixel defining layers (first, second, and third), trench structures, and light emitting stacks. Each layer performs a specific function in achieving high resolution, with the pixel defining layers specifically designed to define pixel boundaries and control light emission areas for 3000 PPI or higher display quality.
Solution Approach 2:
The patent introduces a third pixel defining layer and extends the trench structure vertically through multiple layers, transitioning from planar to three-dimensional pixel definition. This vertical dimensionality allows for better control of light emission areas and improved manufacturing precision for high-resolution displays without proportionally increasing overall device complexity.
2Illumination intensity
If the trench width is increased to improve light emission, then light emission intensity is improved, but manufacturing precision for maintaining pixel boundaries deteriorates
Solution Approach 1:
The pixel defining layers have different width configurations at different locations. The first pixel defining layer has a first width, the second pixel defining layer has a second width, and the third pixel defining layer has a third width, with each width optimized for its specific function. The trench width is also locally optimized with a first width at the top and a second width at the bottom, allowing light emission optimization without compromising pixel boundary definition.
Solution Approach 2:
The trench structure exhibits asymmetric width configuration where the width at different heights varies. The pixel defining layers also have asymmetric width relationships where the first width, second width, and third width are not equal. This asymmetry allows the trench to provide adequate light emission area while the varying pixel defining layer widths maintain precise pixel boundaries through progressive narrowing.
Data Source
AI summary
Provided are a display device, a method for manufacturing the display device, and a head mounted display including the display device. A display device includes an insulating layer disposed on a substrate, a first electrode disposed on the insulating layer, a first pixel defining layer covering a portion of the first electrode, a second pixel defining layer disposed on the first pixel defining layer, a trench penetrating the insulating layer, the first pixel defining layer, and the second pixel defining layer, a light emitting stack disposed on an upper surface of the first electrode and the second pixel defining layer, and a second electrode disposed on the light emitting stack. A width of an entrance of the trench in a direction is greater than a width of a lower surface of the trench in the direction.