Optical Compensation Element Holder Spacing
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Solution Overview
Problem
In projection-type display devices, the heat and force from light shielding plates and packing can cause birefringence and uneven luminance due to contact with the optical compensation element, leading to distortion and image quality issues.
Innovation Solution
A liquid crystal display unit design that includes a light shielding plate to control light incidence, an optical compensation element holder to maintain spacing from other members, and a packing that prevents direct contact with the optical compensation element, ensuring it remains isolated from heat and force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light shielding plates and packing are provided to control light and prevent dust, then light control performance and dust-proof performance are improved, but heat and force are delivered to the optical compensation element causing distortion
Solution Approach 1:
A heat insulating plate is introduced as an intermediary component between the light shielding plate and the optical compensation element. This heat insulating plate has a light-transmissive region that allows light to pass through while its surrounding portion blocks heat transmission from the light shielding plate to the optical compensation element, thus preventing heat delivery while maintaining light control functionality
Solution Approach 2:
The structure is segmented into distinct functional zones: the light shielding plate is divided into a light-transmissive region (for light passage) and a heat insulating plate surrounding portion (for heat blocking). This segmentation allows simultaneous achievement of light control and heat isolation without compromising either function
2Reliability
If packing is adhered to the optical compensation element for dust-proof solution, then dust-proof performance is improved, but force generated during fixation distorts the optical compensation element
Solution Approach 1:
The heat insulating plate serves as a mediator that also prevents force transmission from the packing to the optical compensation element. By positioning the packing on the heat insulating plate rather than directly on the optical compensation element, the structure provides both heat insulation and mechanical isolation, preventing distortion while maintaining dust-proof sealing
3Device complexity
If multiple flat-plate members are overlaid including optical compensation element, then assembly is simplified, but all members including optical compensation element are brought into contact causing heat and force transmission
Solution Approach 1:
The heat insulating plate is positioned between the light shielding plate and the optical compensation element, creating a protective barrier that prevents direct contact. This intermediary structure maintains the relatively simple layered assembly while effectively blocking both heat and force transmission to the optical compensation element
Data Source
AI summary
There is provided a liquid crystal display unit including a liquid crystal panel for modulating light; a light shielding plate for controlling light not to be incident on areas other than an effective pixel area of the liquid crystal panel; an optical compensation element arranged at sides on which the light is incident in the liquid crystal panel and the light shielding plate; and an optical compensation element holder for holding the optical compensation element to be spaced from the light shielding plate and not to contact other members.