Head-Mounted Display Subpixel Layout for Screen-Door Reduction
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Solution Overview
Problem
Users of head-mounted displays (HMDs) with transmissive liquid crystal displays experience the screen-door effect and stripe patterns due to the close proximity of the display area to the eyes and the use of column inversion driving methods, which cause the array of sub-pixels to be visually recognized as a mesh or stripe pattern.
Innovation Solution
The display system employs a mounting unit with two display devices, each having a display area with sub-pixels arrayed in a matrix, where the sub-pixels of different colors are arranged in a mosaic pattern and inclined directions, and the display devices are positioned such that their column and inclined directions are different, combined with a column inversion driving method to ensure the polarities of sub-pixel signals are varied.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a mosaic array of sub-pixels is used to achieve higher-definition images, then image definition is improved, but the screen-door effect and stripe pattern visibility worsen due to the close proximity of the display area to the user's eyes
Solution Approach 1:
The patent applies asymmetry by arranging the mosaic array of sub-pixels such that the row direction and column direction are not aligned with the horizontal and vertical directions of the display area. Specifically, the row direction is inclined at a first angle with respect to the horizontal direction, and the column direction is inclined at a second angle with respect to the vertical direction. This asymmetric arrangement prevents the regular geometric pattern of the sub-pixel array from being directly visible to the user, thereby reducing the screen-door effect and stripe pattern visibility while maintaining high image definition.
2Productivity
If column inversion driving method is used to display images, then image display capability is improved, but stripe pattern visibility worsens due to periodic luminance changes of sub-pixels
Solution Approach 1:
The patent combines the asymmetric arrangement of the mosaic array with the column inversion driving method. The inclined row and column directions cause the periodic luminance changes from column inversion driving to manifest in an asymmetric pattern that does not align with the user's natural viewing angle. This prevents the formation of visible stripe patterns while maintaining the efficiency of the column inversion driving method for displaying images.
Data Source
AI summary
A display system includes: a mounting unit to be worn on a head of a user so as to cover both eyes of the user; two display devices each having a display area provided with arrayed sub-pixels; and a drive circuit configured to output sub-pixel signals for displaying an image in the display area. In the display area, first sub-pixels are continuously arrayed along an inclined direction inclined with respect to the row and column directions, second sub-pixels are continuously arrayed along the inclined direction, and third sub-pixels are continuously arrayed along the inclined direction. The two display devices each include signal lines extending along the column direction and transmit the sub-pixel signals to the sub-pixels. The column direction of first display device, the inclined direction of the first display device, the column direction of second display device, and the inclined direction of the second display device are different directions.