Liquid Crystal Projector Polarizing Plate Adjustment Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional liquid crystal projector devices suffer from image quality deterioration due to the inclination of the incidence side polarizing plate when adjusting the inclination angle of the optical compensating plate, which affects color image quality.
Innovation Solution
A liquid crystal projector device design where the polarizing plate remains perpendicular to the optical axis during adjustments, utilizing a combination frame with a rotation adjustment mechanism for the polarizing plate and an inclination adjustment mechanism for the optical compensating plate, allowing independent rotations and inclinations without affecting the polarizing plate's orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the incidence side polarizing plate and optical compensating plate are moved together during adjustment, then the structure is simplified, but the polarizing plate inclination deteriorates color image quality
Solution Approach 1:
The adjustment mechanism is divided into two independent parts: a rotation adjustment mechanism for the polarizing plate and an inclination adjustment mechanism for the optical compensating plate. This segmentation allows each component to be adjusted independently without affecting the other, preventing the polarizing plate from inclining during compensating plate adjustment and thus maintaining color image quality.
Solution Approach 2:
A support pin is introduced as an intermediary element between the polarizing plate frame and compensating plate frame. The support pin allows the compensating plate frame to rotate independently while maintaining the polarizing plate's perpendicular orientation to the optical axis, thereby mediating the adjustment process to prevent quality deterioration.
2Measurement precision
If the polarizing plate is rotated to adjust black contrast, then the black adjustment is achieved, but the optical compensating plate inclination is simultaneously affected
Solution Approach 1:
The rotation adjustment mechanism and inclination adjustment mechanism are segmented into independent systems. The rotation adjustment mechanism controls only the polarizing plate rotation for black contrast adjustment, while the inclination adjustment mechanism controls only the optical compensating plate inclination for color shading adjustment. This segmentation prevents cross-affectation between the two adjustment functions.
Solution Approach 2:
The mechanism allows dynamic independent adjustment of each component. The polarizing plate can rotate freely for black adjustment, and the optical compensating plate can be inclined independently for color shading correction. The support pin enables the compensating plate frame to rotate about the support pin axis without constraining the polarizing plate frame, allowing both adjustments to be performed dynamically and independently.
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 maintains high-quality color images by preventing changes in the black adjustment status and ensuring accurate rotation and inclination adjustments of the optical components, thereby improving image quality.
Implementation Method 1
an optical compensating plate arranged between the liquid crystal panel and the polarizing plate for compensating birefringence of light caused by the liquid crystal panel
Implementation Method 2
three image generating units for generating image light of three primary colors, each including an outgoing side polarizing plate, a pre-polarizing plate, a liquid crystal panel, an optical compensating plate, and an incidence side polarizing plate
Data Source
AI summary
A liquid crystal projector device of the present invention includes three image generating units for generating image light of three primary colors. Each image generating unit has a polarizing plate and an optical compensating plate held by a combination frame and placed on a support base. The combination frame includes a polarizing plate frame for holding the polarizing plate, and a compensating plate frame for holding the optical compensating plate. The polarizing plate frame is supported on the support base via a rotation adjustment mechanism for rotating the polarizing plate about the optical axis, while the compensating plate frame is supported on the polarizing plate frame via an inclination adjustment mechanism for inclining the optical compensating plate by rotating the optical compensating plate about two axes perpendicular to the optical axis and perpendicular to each other.