Optical Unit Color Filters Suppress Ghosting
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Solution Overview
Problem
The existing optical units using dichroic prisms with light-emitting elements suffer from unwanted light emission due to part of the color light being reflected instead of transmitted, leading to ghosting and contrast deterioration.
Innovation Solution
Incorporating a dichroic prism with a first and second dichroic mirror, and providing color filters between the light-emitting elements and the dichroic prism to selectively transmit or absorb unwanted light wavelengths, along with optical resonators to attenuate any passing unwanted light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a dichroic prism is used to combine light from multiple panels, then color image display is achieved, but unwanted light causes ghosting and contrast deterioration
Solution Approach 1:
A color filter is introduced as an intermediary component between the light-emitting panels and the dichroic prism. This filter selectively transmits the desired wavelength range while absorbing unwanted light, thereby preventing ghosting and contrast deterioration without compromising the color image display capability
Solution Approach 2:
The invention converts the harmful unwanted light into a beneficial filtering process. By positioning the color filter to absorb specific wavelengths, the system transforms the potential harm of unwanted light into a useful mechanism for improving image quality and contrast
2Object-affected harmful factors
If color filters are added to suppress unwanted light, then ghosting and contrast are improved, but device complexity increases
Solution Approach 1:
The color filter is integrated with the existing panel structure, merging the filtering function into the light-emitting unit. This combination approach adds the necessary wavelength selection capability while minimizing the increase in overall device complexity
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 effectively suppresses unwanted light emission from the dichroic prism's emission surface, reducing ghosting and contrast issues in the displayed images.
Implementation Method 1
a first color filter that selectively transmits light of the first wavelength range is provided between the first light-emitting element and the dichroic prism
Implementation Method 2
the unwanted light is blocked by the first color filter
Implementation Method 3
a first dichroic mirror configured to reflect light incident from the first incident surface toward the emission surface and transmit light incident from the second incident surface and the third incident surface
Data Source
AI summary
Provided are an optical unit and a display device being able to inhibit unwanted light, which is generated when a dichroic mirror transmits part of color light to be reflected, from being emitted from an emission surface of a dichroic prism. In the optical unit, color filters (a first color filter, a second color filter, and a third color filter) are provided between a dichroic prism and a first panel, a second panel, and a third panel, the color filters selectively transmitting light of wavelengths incident on the dichroic prism from each of the panels. Further, an optical resonator, which has a resonance wavelength corresponding to a wavelength range of image light incident on the dichroic prism from each of the panels, is provided on the first panel, the second panel, and the third panel.