Projection Display Light Shielding for Thermal Uniformity
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Solution Overview
Problem
The uneven temperature distribution caused by stray light in projection image display devices, which affects display performance, and the need for a dust-proof measure to prevent dust from adhering to display panels.
Innovation Solution
A projection image display device configuration that includes an optical element to separate and synthesize color light beams, display panels for modulation, heat dissipators for temperature management, a light shielding portion to block stray light, and a container for hermetic sealing, with the second heat dissipator positioned outside the container to dissipate heat effectively and prevent dust entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If display panels are used to generate image light for respective color light beams, then color image display capability is improved, but stray light from one display panel heats the periphery of another display panel causing uneven temperature distribution and deteriorating display performance
Solution Approach 1:
The patent introduces a light shielding portion that divides and separates the optical paths of different color light beams. This segmentation prevents stray light from one display panel from reaching another panel, thereby eliminating the harmful thermal interaction while preserving the multi-color display capability.
Solution Approach 2:
The light shielding portion acts as an intermediary element positioned between display panels. It blocks and redirects stray light, preventing direct thermal transfer between panels while allowing the system to maintain its color separation and display functions.
2Temperature
If display panels are exposed to the environment for heat dissipation, then heat dissipation efficiency is improved, but dust and dirt adhere to the display panels
Solution Approach 1:
The patent employs a container with a transparent panel that acts as a protective barrier (thin film/shell) covering the display panels. This barrier prevents dust and dirt from adhering to the panels while still allowing heat to dissipate through the structure, thus protecting the panels without compromising thermal management.
Solution Approach 2:
The container structure serves as an intermediary between the display panels and the external environment. It provides a protective interface that blocks dust particles while permitting thermal energy transfer, thus resolving the contradiction between protection and heat dissipation.
3Temperature
If a light shielding portion is added to block stray light, then temperature distribution uniformity is improved, but device complexity increases
Solution Approach 1:
The light shielding portion is integrated with the container structure that houses the display panels. By merging the light shielding function with the existing protective container, the patent achieves temperature uniformity improvement without proportionally increasing device complexity, as the shielding element becomes part of the overall housing structure.
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 reduces temperature unevenness in display panels irradiated with stray light and ensures the panels remain dust-proof, enhancing display performance by maintaining uniform temperature and preventing dust accumulation.
Implementation Method 1
an optical element that separates incident light into a first color light beam and a second color light beam
Implementation Method 2
a first heat dissipator that dissipates heat of the first display panel; a second heat dissipator that dissipates heat of the second display panel
Implementation Method 3
a light shielding portion that blocks a part of the second color light beam reflected by the second display panel from traveling toward the first display panel
Data Source
AI summary
A projection image display device includes: an optical element that separates incident light into a first color light beam and a second color light beam, synthesizes the first color light beam and the second color light beam to generate synthetic light, and emits the synthetic light; a first display panel that reflects and modulates the first color light beam; a second display panel that reflects and modulates the second color light beam; a first heat dissipator that dissipates heat of the first display panel; a second heat dissipator that dissipates heat of the second display panel; a light shielding portion that blocks a part of the second color light beam reflected by the second display panel from traveling toward the first display panel; a light shield heat dissipator that dissipates heat of the light shielding portion; and a container. The second heat dissipator is disposed outside the container.