Prism Fixing Structure for LCD Projection Displays
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Solution Overview
Problem
Conventional projection display apparatuses using light valves, such as LCD elements, suffer from reduced shock and vibration resistance, durability issues, thermal expansion-induced distortion, and difficulties in assembly and UV curing due to the use of intermediate members and wedge-shaped positioning devices.
Innovation Solution
A projection display apparatus is designed with a prism and two securing members, one with a bonding surface parallel to the optical axis and the other perpendicular, along with spacers to securely hold the image-forming element, enhancing stability and assembly ease while allowing for reliable UV curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a wedge-shaped positioning device is used to position the light valve, then the light valve can be positioned, but the light valve becomes distorted due to thermal expansion of the positioning device
Solution Approach 1:
The patent removes the wedge-shaped positioning device from the fixing structure. Instead, it uses a fixing frame plate with through-holes that directly receive and secure the light valve, eliminating the source of thermal expansion distortion while maintaining positioning capability
Solution Approach 2:
Rather than using a positioning device that actively holds the light valve in place (which causes distortion), the patent inverts the approach by using a fixing frame with through-holes where the light valve is inserted and secured, reversing the positioning mechanism to avoid thermal expansion issues
2Measurement precision
If a wedge-shaped positioning device is used, then positioning is achieved, but assembly becomes difficult due to the small gap required for insertion
Solution Approach 1:
The patent segments the fixing structure into a fixing frame plate with multiple through-holes, allowing the light valve to be inserted through separate openings rather than maneuvering a wedge-shaped device into a tight gap, significantly easing assembly
Solution Approach 2:
Instead of positioning through lateral insertion of a wedge device into a small gap, the patent enables positioning through the thickness dimension by using through-holes that allow insertion from one side of the fixing frame plate, transforming a difficult 2D assembly problem into an easier 3D operation
3Measurement precision
If the positioning device is disposed relatively distant from the temporal fixing device, then positioning is possible, but counter force is insufficient when stress in the positioning device is released
Solution Approach 1:
The patent merges the positioning and fixing functions into a single integrated structure where the fixing frame plate's through-holes both position and secure the light valve simultaneously, eliminating the need for separate positioning and fixing devices and ensuring sufficient counter force through direct structural support
4Ease of manufacture
If many intermediate members are used in the light-valve fixing unit, then the structure can be assembled, but shock and vibration resistance is reduced
Solution Approach 1:
The patent removes unnecessary intermediate members from the fixing structure, using a simplified design where the fixing frame plate directly secures the light valve through through-holes and sealing members, reducing the number of components while improving shock and vibration resistance through a more robust direct-connection 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 improves shock and vibration resistance, maintains accuracy during thermal changes, and simplifies assembly and UV curing, resulting in a more durable and reliable projection display apparatus with increased resolution.
Implementation Method 1
a predetermined spacing is maintained between the image-forming element and the prism member
Implementation Method 2
a first securing member fixed to the prism and including a bonding surface substantially parallel to an optical axis of a light beam entering the image-forming element, a second securing member holding the image-forming element and including a bonding surface substantially perpendicular to the optical axis of the light beam entering the image-forming element
Data Source
AI summary
At least one exemplary embodiment is directed to a projection display apparatus configured to project an image on a projection plane, the image being formed using light from a light source by an image-forming element, is provided. The projection display apparatus includes a prism, a first securing member operatively connected to the prism and includes a bonding surface substantially parallel to an optical axis of a light beam entering the image-forming element, a second securing member holding the image-forming element and includes a bonding surface substantially perpendicular to the optical axis of the light beam entering the image-forming element.