Eyepiece Display Barrier for Light Path Extension
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Solution Overview
Problem
Existing display devices face challenges in increasing light extraction efficiency without deteriorating image resolution, as methods like using a half-mirror to extend the light path towards the eyepiece result in reduced light emission.
Innovation Solution
Incorporating a front quarter-wave plate, a rear quarter-wave plate, a reflective polarizing plate, and a barrier with reflecting and transmitting regions between the display panel and the eyepiece, where the barrier includes a supporting substrate with reflective patterns that overlap the reflecting regions and have transmitting regions larger than the pixel regions, allowing for optimized light path extension without significant light loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a half-mirror is used to extend the light path from the display panel to the eyepiece, then the resolution is improved, but the light emission to the outside is reduced
Solution Approach 1:
The barrier is segmented into multiple regions: first reflecting regions, first transmitting regions, second reflecting regions, and second transmitting regions. This segmentation allows different portions of light to be directed through different paths, enabling both resolution enhancement (through extended light paths via reflection) and light emission maintenance (through transmitting regions that allow direct light passage).
Solution Approach 2:
Different regions of the barrier have different optical properties (reflecting vs. transmitting). The reflecting regions are positioned to extend the light path for resolution improvement, while the transmitting regions are positioned to maintain light emission. This local differentiation of optical characteristics resolves the contradiction between resolution and light emission.
2Measurement precision
If the path of light travelling toward the eyepiece from the display panel is increased, then the resolution is improved, but the light loss between the display panel and the eyepiece increases
Solution Approach 1:
The optical components (quarter-wave plates, polarizers, barrier) are nested in a specific sequence between the display panel and the eyepiece. The barrier with its reflecting and transmitting regions is nested within this optical path, allowing it to extend the effective light path length (improving resolution) while the transmitting regions ensure that light can still reach the eyepiece with minimal loss.
Solution Approach 2:
The barrier acts as an intermediary component that mediates between the need for extended light paths (for resolution) and the need to minimize light loss. By strategically positioning reflecting and transmitting regions, the barrier extends the light path where needed while allowing direct transmission where light loss would be problematic.
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 light extraction efficiency while maintaining image resolution, improving the quality and color reproduction rate of the displayed image by minimizing light loss and extending the light path effectively.
Implementation Method 1
A front linear polarizer is disposed between the display panel and the front quarter-wave plate. A reflective polarizing plate is disposed between the rear quarter-wave plate and the eyepiece.
Implementation Method 2
A front quarter-wave plate is disposed between the display panel and the eyepiece. A rear quarter-wave plate is disposed between the front quarter-wave plate and the eyepiece.
Implementation Method 3
The barrier includes reflecting regions and transmitting regions. Reflective patterns are disposed on the supporting substrate. The reflective patterns overlap the reflecting regions.
Data Source
AI summary
A display device including a display panel and an eyepiece is provided. An image realized by the display panel can be provided to a user by passing through the eyepiece. The display device can further include a front quarter-wave plate and a rear quarter-wave plate in order to increase the path of light traveling toward the eyepiece from the display panel. A barrier can be disposed between the front quarter-wave plate and the rear quarter-wave plate. The barrier can reflect or transmit the light traveling toward the eyepiece from the display panel on a region-by-region, so that the loss of light recognized by the user through the eyepiece can be minimized.