Head Mounted Display Optical Path Compensation
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Solution Overview
Problem
Head-mounted display devices cause user fatigue due to the constant distance between the display panel and the user's eyes, leading to motion sickness and a visible 'screen door effect' from pixel visibility.
Innovation Solution
A head-mounted display device with a display panel comprising a first and second display region arranged at specific angles, a reflective panel, and a lens, where the second display region has a different optical path length to the lens, and a timing controller that processes image data to generate sub-data for each region, compensating for pixel arrangements and depth differences to reduce pixel visibility and simulate varying lens thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a display panel with high pixel density is used in a head mounted display device, then the resolution is improved, but the screen door effect occurs because pixels become visible to the user
Solution Approach 1:
The display panel is divided into multiple sub-display panels (first, second, third, fourth sub-display panels) arranged in different orientations. Each sub-display panel contributes to different portions of the final image, allowing high pixel density to be achieved while distributing the pixel visibility issue across multiple segments that are optically combined through the reflective panel and lens system
Solution Approach 2:
The invention introduces multiple display regions arranged at different angles (first display region at 90 degrees, second display region at 45 degrees relative to the lens optical axis). This spatial arrangement in multiple dimensions allows the system to achieve high resolution while the reflective panel redirects light paths to prevent direct pixel visibility, effectively solving the screen door effect through dimensional reconfiguration
2Device complexity
If the distance between the display panel and the user's eyes is kept constant, then the device structure is simplified, but the user experiences fatigue and motion sickness due to inability to accommodate lens thickness changes
Solution Approach 1:
The invention creates different optical path lengths for different display regions. The first display region has a first optical path length while the second display region has a second optical path length that is longer than the first. This dynamic optical path variation allows the user's eye lens to accommodate naturally as if viewing objects at different distances, reducing fatigue while maintaining a fixed physical device structure
Solution Approach 2:
The reflective panel acts as an intermediary that redirects light from the second display region to extend the optical path length without increasing the physical distance between the display panel and user's eyes. This allows the system to simulate varying focal distances and enable natural lens accommodation while keeping the device structure compact and fixed
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 improves resolution by compensating for pixel visibility and reduces user fatigue by simulating varying lens thickness based on image depth, thereby minimizing the 'screen door effect' and motion sickness.
Implementation Method 1
a reflective panel arranged with a second angle with respect to the second display region, configured to output a first transmitted light by transmitting a first light which is output from the first display region, and configured to output a second reflected light by reflecting a second light which is output from the second display region
Implementation Method 2
a lens configured to collect the first transmitted light and the second reflected light
Data Source
AI summary
A head mounted display device includes a display panel including a first display region and a second display region which is arranged at a first angle with respect to the first display region; a reflective panel arranged at a second angle with respect to the second display region, to output a first transmitted light by transmitting a first light which is output from the first display region, and to output a second reflected light by reflecting a second light output from the second display region; and a lens to collect the first transmitted light and the second reflected light.