Diffraction Pattern Layer for Head Mount Display Light Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices, particularly head mount display devices, face challenges in increasing effective light emission area ratios, minimizing visual blurring, and reducing the screen door effect (SDE) due to limitations in diffraction pattern design and placement.
Innovation Solution
A display device and head mount display device incorporating a diffraction pattern layer with specific pitch and length arrangements that do not overlap with display elements, enhancing light emission by diffracting light emitted from OLEDs and optimizing the arrangement of diffraction patterns in non-display regions to increase the effective light emission area ratio and reduce SDE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If diffraction patterns are added to increase effective light emission area, then luminous efficiency is improved, but visual blurring increases
Solution Approach 1:
The patent applies local quality by positioning diffraction patterns specifically in non-display regions rather than uniformly across the entire display area. This localized placement allows the diffraction patterns to enhance light emission in specific areas without causing blurring in the display region, as the patterns are confined to peripheral zones where they can redirect light without interfering with the actual image content.
Solution Approach 2:
The patent utilizes the vertical dimension by controlling the pitch and depth of diffraction patterns to redirect light at specific angles. By adjusting the pitch parameter and the vertical positioning of diffraction patterns, the system can redirect light upward or sideways into the viewer's eye without adding horizontal blurring to the displayed image, thus solving the contradiction between increasing light emission and maintaining image sharpness.
2Manufacturing precision
If diffraction patterns are placed in non-display regions to avoid overlap, then manufacturing precision is improved, but effective light emission area is reduced
Solution Approach 1:
The patent resolves this contradiction by utilizing the vertical dimension for light redirection. Instead of expanding diffraction patterns horizontally into display regions, the system uses vertical pitch control to redirect light at angles that bypass the display region boundaries. This allows diffraction patterns to be placed in non-display areas while still effectively increasing light emission into the viewer's field of view, maintaining both manufacturing precision and light emission efficiency.
3Use of energy by moving object
If pitch of diffraction patterns is decreased to increase light emission, then effective light emission area is improved, but screen door effect increases
Solution Approach 1:
The patent applies local quality by confining diffraction patterns to non-display regions with controlled pitch, while maintaining larger pitch values in the display region. This localized approach allows the diffraction patterns to redirect light effectively without creating the screen door effect in the viewing area, as the patterns are positioned where they can guide light without being perceived as visual artifacts by the user.
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 enlarges the effective light emission area ratio, minimizes visual blurring, and reduces the screen door effect, thereby improving luminous efficiency and user experience by optimizing the diffraction pattern layer's design and placement.
Implementation Method 1
a diffraction pattern layer disposed on a path of light emitted from the plurality of display elements
Data Source
AI summary
A display device comprising: a substrate; a plurality of display elements disposed on the substrate; and a diffraction pattern layer disposed on a path of light emitted from the plurality of display elements. The diffraction pattern layer comprises a plurality of diffraction patterns which is disposed with a predetermined pitch, and the plurality of diffraction patterns do not overlap the plurality of display elements; and when a width of a cross section of each of the plurality of diffraction patterns is defined as a length of each diffraction pattern, the predetermined pitch and the length of each diffraction pattern satisfy the following inequation: 0.4≤d1/DP1<1, where DP1 denotes the predetermined pitch, and d1 denotes the length of each diffraction pattern.