Dual Mask Light Shielding for Projection Display Heat Management
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Solution Overview
Problem
The increasing energy of illumination light in projection type display devices leads to higher temperatures in light shielding masks, which can propagate heat to liquid crystal display elements, causing temperature rises and potentially deteriorating image quality and stability. Additionally, existing light shielding masks with inclined portions are difficult to manufacture and may not effectively block obliquely entering light near pixel regions.
Innovation Solution
A display device configuration that includes a liquid crystal display element, a heat sink, a first mask member with lower thermal conductivity, a second mask member with higher thermal conductivity, and an optical member, where the first mask member is positioned close to the liquid crystal display element to block unnecessary light effectively while the second mask member is further away to dissipate heat efficiently, and a pressing plate is used to maintain the optical member's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the light shielding mask is positioned close to the liquid crystal display element to block unnecessary light effectively, then the light shielding capability is improved, but the temperature of the liquid crystal display element rises due to heat propagation from the mask
Solution Approach 1:
The light shielding mask is divided into multiple masks arranged at different positions along the optical path. The first mask is positioned close to the liquid crystal display element for effective light shielding, while subsequent masks are positioned further away to manage heat propagation, allowing each mask to serve specialized functions
Solution Approach 2:
Multiple masks are introduced as intermediary elements between the light source and the liquid crystal display element. These masks act as mediators to block unnecessary light while distributing heat management across multiple components rather than relying on a single mask positioned close to the display element
2Temperature
If the light shielding mask is positioned away from the liquid crystal display element to reduce heat propagation, then the temperature stability is improved, but the light shielding capability deteriorates due to obliquely entering light not being blocked
Solution Approach 1:
The light shielding function is segmented across multiple masks positioned at different distances from the liquid crystal display element. The first mask positioned close to the element handles oblique light effectively, while subsequent masks positioned further away contribute to overall light shielding and heat management
Solution Approach 2:
The solution transitions from a single mask positioned at one distance to multiple masks arranged along the optical path dimension. This dimensional arrangement allows simultaneous optimization of light shielding capability (achieved by masks close to the element) and temperature stability (achieved by masks further away)
3Temperature
If a light shielding mask with inclined portions is used to prevent heat propagation, then the temperature control is improved, but the manufacturing difficulty increases and optical components must be positioned further away
Solution Approach 1:
Instead of creating complex inclined portions on a single mask, the solution segments the light shielding function into multiple masks with simpler geometries. Each mask can be manufactured independently using standard processes, avoiding the manufacturing complexity of inclined portions while achieving similar heat management effects through spatial arrangement
Solution Approach 2:
The solution moves from modifying the geometry of a single mask (inclined portions) to arranging multiple masks along the optical path dimension. This dimensional approach achieves heat propagation control through spatial distribution rather than geometric modification, simplifying manufacturing
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 prevents heat from the second mask member from propagating to the liquid crystal display element, maintains excellent light shielding capability, and allows for easier and cost-effective manufacturing of the light shielding mask, while ensuring the polarization adjustment member can be positioned near the front surface of the liquid crystal display element.
Implementation Method 1
a heat sink that dissipates heat of the liquid crystal display element
Implementation Method 2
a heat sink that dissipates heat of the liquid crystal display element
Implementation Method 3
a first mask member that masks unnecessary light among the illumination light
Implementation Method 4
a first mask member that masks unnecessary light among the illumination light
Implementation Method 5
a second mask member that masks the unnecessary light
Implementation Method 6
a second mask member that masks the unnecessary light
Data Source
AI summary
A liquid crystal display element includes a pixel region which optically modulates received illumination light for each pixel. A heat sink dissipates heat of the liquid crystal display element. A first mask member is fixed to the heat sink, is formed of a material having a lower heat transfer rate than the heat sink, includes a first opening of which the size corresponds to the size of the pixel region, and masks unnecessary light. A second mask member is arranged at a position further away from the liquid crystal display element than the first mask member, is fixed to the heat sink, is formed of a material having a higher heat transfer rate than the first mask member, includes a second opening of which the size is equal to or larger than the size of the first opening, and masks the unnecessary light.