Dichroic Prism Display Layout With Peripheral Light Shielding
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Solution Overview
Problem
In optical units using organic electroluminescent panels, stray light occurs due to oblique light incidence on peripheral regions, causing image quality deterioration, as dichroic mirrors fail to effectively reflect or transmit color light within the intended wavelength ranges.
Innovation Solution
The implementation of a light shielding layer between the dichroic prism and the peripheral region of the substrates, which absorbs light across different wavelength ranges, preventing leaked light from being reflected and thus reducing stray light occurrence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If dichroic mirrors are used to reflect and transmit color light in the optical unit, then color image light can be synthesized and displayed, but stray light occurs due to oblique light incidence on peripheral regions causing image quality deterioration
Solution Approach 1:
The patent extracts and removes the harmful oblique light before it reaches the peripheral regions by introducing a light shielding layer. This layer specifically targets and blocks oblique incident light that would otherwise cause stray light reflections, while allowing the desired color image light to pass through the dichroic mirrors for synthesis and display.
Solution Approach 2:
The light shielding layer acts as an intermediary element positioned between the dichroic mirrors and the peripheral regions. It mediates the interaction by selectively blocking harmful oblique light while permitting the intended color image light to reach the display region, thus preventing stray light without interfering with the color synthesis function.
2Object-affected harmful factors
If light shielding layer is added to block stray light, then image quality improves, but device complexity increases
Solution Approach 1:
The light shielding layer is applied locally only to the peripheral regions where stray light problems occur, rather than throughout the entire optical path. This localized approach effectively suppresses stray light reflections from peripheral areas while maintaining the optical performance in the central display region and minimizing the overall structural complexity.
Solution Approach 2:
The patent employs a thin film light shielding layer that can be applied as a coating or overlay on the peripheral regions. This thin film approach provides effective stray light suppression without adding significant structural complexity, bulk, or weight to the optical unit, maintaining a compact and simple overall design.
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 light shielding layer effectively blocks leaked light, suppressing stray light reflections and enhancing image quality by ensuring that only intended light is emitted from the dichroic prism, thereby improving the display device's performance.
Implementation Method 1
a light shielding layer which absorbs light of a first wavelength range, light of a second wavelength range, and light of a third wavelength range
Implementation Method 2
a first dichroic mirror configured to reflect the first image light toward the emission surface and transmit the second image light and the third image light
Implementation Method 3
a second dichroic mirror configured to reflect the second image light toward the emission surface and transmit the first image light and the third image light
Data Source
AI summary
Provided is an optical unit and a display device capable of suppressing the occurrence of stray light by suppressing the incidence of light onto a peripheral region of a panel. In the optical unit, a first panel, a second panel, and a third panel are arranged to face a dichroic prism. A first light-emitting element is provided in a display region of the first panel, the second panel, and the third panel, and metal wiring is provided in a peripheral region. Here, a light shielding layer is provided between the dichroic prism and the peripheral region of each of the first panel, the second panel, and the third panel. Thus, even when a part of color light that should be reflected passes through a dichroic mirror, the leaked light is absorbed by the light shielding layer.