AR Display Pixel Structure With Bank Layer for Narrow Emission
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Solution Overview
Problem
LED display panels have a larger light emitting angle than the light collection angle of projection lenses, resulting in insufficient brightness for augmented reality display apparatuses.
Innovation Solution
A display apparatus with a small light emitting angle is achieved by using a driving backplane with light emitting components, a first bank layer with oblique surfaces, and scattering particles on the light emitting surfaces, creating air gaps and diffusing light to reduce the emitting angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If LED display panel is used for AR display apparatus, then power saving and high brightness are improved, but light emitting angle is larger than light collection angle of projection lens resulting in insufficient brightness
Solution Approach 1:
The patent introduces a bank layer with oblique surfaces at specific locations (around the light emitting components) to locally modify light emission characteristics. The oblique surfaces are positioned only where needed to control the light emitting angle, while other parts of the display panel maintain their original properties. This localized modification reduces the light emitting angle to match the projection lens collection angle without affecting the overall brightness of the display.
Solution Approach 2:
The bank layer features asymmetric oblique surfaces with specific tilt angles relative to the light emitting components. These asymmetric surfaces are designed to redirect light in specific directions, creating an asymmetric light emission pattern that concentrates light within the collection angle of the projection lens. The asymmetric geometry of the oblique surfaces enables precise control over the light emitting angle while maintaining high brightness in the desired direction.
2Productivity
If bank layer with oblique surfaces is added to reduce light emitting angle, then light collection efficiency is improved, but device complexity increases
Solution Approach 1:
The bank layer is designed with a porous or open structure featuring multiple openings that allow light to pass through while providing the oblique surfaces for light redirection. This porous configuration enables the bank layer to perform its light controlling function without requiring a solid, complex structure. The openings reduce material usage and simplify manufacturing while maintaining the light collection efficiency through the oblique surfaces.
Solution Approach 2:
The bank layer acts as an intermediary component between the light emitting components and the projection lens. Rather than modifying the LED components themselves or the projection lens, the bank layer mediates the light path by providing oblique surfaces that redirect light at appropriate angles. This intermediary approach simplifies the overall system complexity compared to modifying the fundamental LED or lens structures.
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 effectively reduces the light emitting angle of each pixel to approximately 57°, improving the brightness and clarity of images for augmented reality applications.
Implementation Method 1
The scattering particles are disposed on a plurality of light emitting surfaces of the light emitting components. A plurality of air gaps exist between the scattering particles and the oblique surfaces of the first bank layer.
Data Source
AI summary
A display apparatus includes a driving backplane, a plurality of light emitting components, a first bank layer and a plurality of scattering particles. The first bank layer is disposed on the driving backplane. The first bank layer has a plurality of first openings and a plurality of oblique surfaces defining the first openings. The light emitting components respectively overlap with the first openings of the first bank layer. The scattering particles are disposed on a plurality of light emitting surfaces of the light emitting components. A plurality of air gaps exist between the scattering particles and the oblique surfaces of the first bank layer.