Projection Device Local Dimming Light Valve Contrast
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Solution Overview
Problem
Current projection devices suffer from reduced contrast between dark and bright regions of projected images due to uniform illumination, adversely affecting imaging quality.
Innovation Solution
A projection device with a local dimming mechanism that uses multiple light-emitting assemblies to form light spots on a light valve, allowing independent control of light modulation regions to enhance contrast ratio, achieved through a combination of light-emitting devices, a light guide element, and a local dimming element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light uniforming element is used to uniform the illumination light beam, then the illumination uniformity is improved, but the contrast between dark region and bright region of projected image is reduced
Solution Approach 1:
The illumination system is divided into multiple independent light-emitting assemblies (first, second, and third light-emitting assemblies) that can be controlled separately. Each assembly corresponds to specific light modulation regions on the light valve, enabling independent control of illumination intensity for different spatial zones. This segmentation allows dark regions to receive reduced illumination while bright regions receive sufficient illumination, thereby maintaining high contrast without sacrificing overall illumination uniformity.
Solution Approach 2:
Different regions of the light valve receive different illumination intensities from the multiple light-emitting assemblies. The first light-emitting assembly illuminates the first light modulation region, the second light-emitting assembly illuminates the second light modulation region, and the third light-emitting assembly illuminates the third light modulation region. This local differentiation enables the system to provide tailored illumination quality to different areas, making dark regions darker and bright regions brighter, thus improving the contrast ratio.
2Object-affected harmful factors
If multiple light-emitting assemblies are used to form light spots on the light valve, then the contrast ratio is improved, but the device complexity is increased
Solution Approach 1:
The multiple light-emitting assemblies serve multiple functions: they provide illumination for the light valve, enable local dimming control, and create the contrast effect. Each light-emitting assembly is configured to emit light beams that form light spots covering specific light modulation regions, allowing the system to achieve both illumination and contrast control through a unified structure. This multi-functionality reduces the need for separate components for illumination and contrast control.
Solution Approach 2:
The patent introduces a spatial dimension to the illumination control by arranging multiple light-emitting assemblies in specific positions and orientations. The first light-emitting assembly, second light-emitting assembly, and third light-emitting assembly are positioned and oriented to create overlapping light spots that cover different regions of the light valve. This spatial arrangement enables independent control of different regions through a compact configuration, managing device complexity while achieving high contrast.
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
Improves the contrast ratio of projected images by independently controlling the light spots on the light valve, making dark regions darker and bright regions brighter, thereby enhancing image quality.
Implementation Method 1
The at least one light-emitting device includes a plurality of light-emitting assemblies. The plurality of light-emitting assemblies of the at least one light-emitting device emit the illumination light beams
Implementation Method 2
The light valve is disposed on a transmission path of the illumination light beam and is configured to convert the illumination light beam into an image light beam. The light valve includes a plurality of light modulation regions
Implementation Method 3
The projection lens is disposed on a transmission path of the image light beam, and is configured to project the image light beam out of the projection device
Data Source
AI summary
A projection device including an illumination system, a light valve, and a projection lens is provided. The illumination system emits an illumination light beam. The illumination system includes at least one light-emitting device, and the at least one light-emitting device includes multiple light-emitting assemblies. The light valve is disposed on a transmission path of the illumination light beam and converts the illumination light beam into an image light beam. The light valve includes multiple light modulation regions. The projection lens is disposed on a transmission path of the image light beam, and is configured to project the image light beam out of the projection device. The illumination light beams emitted by the light-emitting assemblies of the at least one light-emitting device form multiple light spots on the light valve, and the light modulation regions are respectively covered by the light spots.