Projection Display Heat-Sink Layout for Reflective LCD Fringe Control
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Solution Overview
Problem
Existing projection display devices face challenges in effectively heating and cooling reflective liquid crystal display elements, with heating reducing cooling performance and vice versa, leading to suboptimal operation and potential interference fringes, particularly with blue laser light sources.
Innovation Solution
A projection display device design featuring a reflective liquid crystal display element, a heat sink with a specific alignment and contact area configuration, and a cooling fan, where the heat source is positioned within the display element's length, ensuring efficient heat transfer and balanced heating and cooling through temperature sensors and drive circuits to maintain optimal element temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heat source is added to heat the reflective liquid crystal display element, then the element can operate at optimal temperature in cold environments, but the cooling performance is reduced and interference fringes may occur
Solution Approach 1:
The heat source is positioned to provide localized heating only to specific regions of the reflective liquid crystal display element that require temperature maintenance, rather than heating the entire element uniformly. This localized approach allows temperature control in cold environments while minimizing the risk of creating temperature gradients that cause interference fringes.
Solution Approach 2:
The system dynamically adjusts the heating and cooling operations based on real-time temperature conditions. The control unit activates the heat source only when temperature sensors detect that the element temperature is below the optimal operating range, and activates the cooling fan when temperature rises, creating a dynamic balance that prevents interference fringes while maintaining optimal temperature.
2Power
If the heat source contact area with the base is increased to improve heating efficiency, then heating performance improves, but the cooling performance is further reduced
Solution Approach 1:
The base is divided into distinct functional regions: a heat source contact area for efficient heating and a heat sink contact area for effective cooling. These segmented regions are spatially separated, allowing the heat source to have sufficient contact area for heating efficiency without compromising the heat sink's ability to dissipate heat, thus resolving the contradiction between heating and cooling performance.
Solution Approach 2:
The base acts as an intermediary thermal management system with thermally conductive material that facilitates efficient heat transfer from the heat source to the reflective liquid crystal display element while maintaining separate pathways for heat dissipation to the heat sink. This intermediary structure enables independent optimization of both heating and cooling functions.
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 solution enables efficient heating and cooling of reflective liquid crystal display elements, maintaining optimal temperatures regardless of ambient conditions or light source driving current, reducing interference fringes, and ensuring high-quality image projection.
Implementation Method 1
a heat sink configured to include a base with a plate shape... a reflective liquid crystal display element fixed to a first surface of the base
Implementation Method 2
a cooling fan configured to apply cooling air to the heat sink
Implementation Method 3
a heat source fixed to a second surface facing the first surface of the base... the reflective liquid crystal display element and the heat source face each other with the base therebetween
Data Source
AI summary
A projection display device includes: a reflective liquid crystal display element; a heat sink; a heat source; and a cooling fan. It is assumed that a length of the reflective liquid crystal display element is length L1, a length of the heat source is length L3, and a plate thickness of a base of the heat sink is plate thickness t in at least one direction of a longitudinal direction or a transverse direction of the reflective liquid crystal display element. The reflective liquid crystal display element and the heat source face each other with the base therebetween such that the length L3 of the heat source is located within the length L1 of the reflective liquid crystal display element. The length L3 of the heat source satisfies L3≥L1−2t.