Inclined Optical Axis Subpixels for HMD Viewing Angle
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Solution Overview
Problem
Existing head-mounted displays with OLED technology face challenges in maintaining excellent viewing angle characteristics when the size of the display panel is reduced, due to the limitations imposed by the placement of color filters over light emitting positions, which restricts the increase in viewing angles.
Innovation Solution
The electro-optical apparatus incorporates subpixels with light emitting elements having optical axes inclined towards the center of the display area, with color filters of the same color arranged in directions where the inclination range is larger, and overlapping in specific patterns to adjust their influence, thereby improving viewing angle characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the size of the display panel is reduced to minimize the head-mounted display, then the device size is reduced, but the viewing angle characteristics deteriorate because color filters disposed right over light emitting positions limit the increase in viewing angles
Solution Approach 1:
The patent applies local quality by making the optical axis inclination different for different regions of the display panel. Specifically, light emitting elements are configured with optical axes inclined toward the central side at different angles according to their positions, with greater inclination for elements farther from the center. This localized adjustment optimizes viewing angle characteristics for each region while maintaining a reduced display panel size.
Solution Approach 2:
The patent employs asymmetry by creating an asymmetric arrangement where color filters of the same color are disposed to overlap with light emitting elements at different positions and angles. The overlapping relationship is asymmetric - color filters are positioned to receive light at optimized angles rather than being symmetrically aligned, which improves viewing angle characteristics while maintaining compact dimensions.
2Ease of operation
If color filters are disposed right over light emitting positions to secure viewing angle characteristics from the front, then front viewing is optimized, but the ability to increase viewing angles for reduced panel sizes is limited
Solution Approach 1:
The patent applies parameter changes by modifying the optical axis inclination parameter of light emitting elements based on their position. Instead of a uniform configuration, the optical axis angle is varied as a parameter according to location on the display panel, allowing the system to adapt to different viewing angles while maintaining image quality and color accuracy.
Solution Approach 2:
The patent introduces a new dimensional aspect by considering the angular dimension of light emission. Rather than only optimizing for the perpendicular viewing direction, the solution adds the dimension of inclined viewing angles by configuring optical axes at various inclinations, thereby expanding the effective viewing cone in three-dimensional space.
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 enhances viewing angle characteristics and image quality by minimizing the impact of color filters on each other's rays, even when the display panel is minimized, ensuring consistent brightness and chromaticity across various viewing angles.
Implementation Method 1
a light emitting element
Implementation Method 2
optical axes of the light emitting elements are inclined against respective normal lines of light emitting surfaces of the light emitting elements to a central side of the display area
Implementation Method 3
color filters of different colors, and have different display colors corresponding to the color filters
Data Source
AI summary
An optical axis of a light emitting element is inclined against a normal line of a light emitting surface of the light emitting element to a central side of a display area in a row direction according to positions of subpixels in the row direction, and the optical axis is inclined against the normal line of the light emitting surface to the central side of the display area in a column direction according to the positions of the subpixels in the column direction. A range of inclination of the optical axis is different in the row direction and the column direction. In the row direction and the column direction, the subpixels are disposed such that color filters of the same color are arranged in a direction in which the range of inclination becomes larger, and color filters of colors which are different from each other are arranged in another direction.