Head Mounted Display Light Blocking Layer Aperture Optimization
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Solution Overview
Problem
Head-mounted display devices face challenges in minimizing external light reflection while maintaining high transmittance, particularly due to the low transmittance of circularly polarized films and the visibility of foreign substances caused by the short distance between the display panel and the user's eyes.
Innovation Solution
The design incorporates a display panel with a pixel layer and a light blocking layer that has increasing overlap areas and opening sizes towards the outer portion, along with an anti-reflection layer for destructive interference, eliminating the need for a circularly polarized film to reduce reflection and enhance transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a circularly polarized film is attached to the display panel to minimize reflection of external light, then reflection is reduced, but transmittance in the visible ray area decreases
Solution Approach 1:
The patent changes the optical parameters of the display panel by implementing a pixel structure with varying aperture ratios across different regions. The pixel aperture ratio is set to be greater than 50% in the center region and greater than 30% in the peripheral region, optimizing light transmission characteristics without requiring circularly polarized films.
Solution Approach 2:
The patent applies different aperture ratio characteristics to different regions of the display panel. The center portion has a higher aperture ratio (>50%) for optimal transmittance, while the peripheral portion has a moderate aperture ratio (>30%) to balance reflection control and light transmission, eliminating the need for uniform circularly polarized film coverage.
2Measurement precision
If the resolution of the head mounted display device is increased, then image quality improves, but the aperture ratio deteriorates and transmittance decreases
Solution Approach 1:
The patent maintains high resolution while improving transmittance by optimizing the pixel structure with aperture ratios greater than 50% in the center region. This structural parameter change allows finer pixel density for high resolution without proportionally reducing light transmission area.
3Volume of moving object
If the distance between the display panel and user eyes is reduced for compact design, then device size decreases, but foreign substances in the film become more visible
Solution Approach 1:
The patent extracts and eliminates the circularly polarized film from the optical path by using a reflective polarizer alternative. This removal eliminates the source of foreign substance visibility issues while maintaining the compact form factor with reduced eye-to-panel distance.
4Object-affected harmful factors
If a light blocking layer is added to reduce reflection, then reflection control improves, but light transmission may be affected
Solution Approach 1:
The patent applies the light blocking layer selectively in specific regions of the display panel rather than uniformly across the entire surface. This localized application blocks external light reflection in areas where it is most problematic while preserving light transmission in critical viewing zones, optimizing both reflection control and light transmission.
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 configuration minimizes external light reflection, improves transmittance, and prevents ghost images, while maintaining high resolution by strategically placing light blocking layers and anti-reflection layers to optimize light transmission.
Implementation Method 1
an anti-reflection layer for destructive interference
Data Source
AI summary
A head mounted display device according to an exemplary embodiment includes: a case; a display panel that is disposed in the case and is capable of displaying an image; and an optical system between the display panel and a user, wherein the display panel includes a pixel layer that includes a plurality of pixels capable of emitting light and a light blocking layer on the pixel layer and having a plurality of light blocking openings, and the area of a first area where the light blocking layer and the pixel are overlapped with each other in a plane view is gradually increased toward an outer portion of the display panel from a center portion of the display panel.