Image Display Apparatus 1/4 Wave Plate Polarization Control
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Solution Overview
Problem
Current image display technologies face challenges in achieving high-quality image display, particularly in preventing color unevenness and brightness drops due to reflection characteristics, especially when used with 3D glasses or in ultra-short focus projections.
Innovation Solution
An image display apparatus comprising a polarizer, a polarization conversion element, and a ¼ wave plate, where the polarizer transmits linearly polarized light, the polarization conversion element converts it into non-polarized light, and the ¼ wave plate is arranged on the optical path to prevent reflection components from being reflected back, ensuring equal reflectance across colors and maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If linearly polarized light is transmitted through the polarizer, then the polarization state is controlled, but reflection components are reflected again causing color unevenness and brightness drop
Solution Approach 1:
A 1/4 wave plate is introduced as an intermediary element between the polarizer and the projection lens. This wave plate converts the linearly polarized light into circularly polarized light, which then passes through the polarization conversion element. The circularly polarized light interacts with the reflection component differently, preventing the harmful reflection from being reflected again by the polarizer, thus eliminating color unevenness and brightness drop.
Solution Approach 2:
The polarization state of the light is changed from linear polarization to circular polarization by introducing the 1/4 wave plate. This parameter change in the polarization state allows the light to interact differently with the reflection component, preventing the reflection component from being reflected again by the polarizer and thereby improving image quality.
2Reliability
If a polarization conversion element is used to convert polarized light to non-polarized light, then color unevenness is reduced, but the system complexity increases
Solution Approach 1:
The polarization conversion element serves multiple functions: it converts the polarization state of the light passing through the 1/4 wave plate, and it also works in conjunction with the wave plate to prevent reflection components from being reflected again. This multi-functionality reduces the need for additional separate components, thereby managing system complexity while achieving color uniformity.
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 effectively prevents color unevenness and brightness drops, enabling the display of high-quality images by converting image light into a non-polarized state, which reduces ghost components and maintains the polarization scrambler's effectiveness.
Implementation Method 1
a polarizer that causes to transmit linearly polarized light having a predetermined polarization direction
Implementation Method 2
a polarization conversion element that converts a polarization state of the linearly polarized light transmitted through the polarizer and emits the light as light in a non-polarized state
Implementation Method 3
The 1⁄4 wave plate is arranged on an optical path of the light in the non-polarized state emitted from the polarization conversion element... prevent a reflection component of the light in the non-polarized state traveling in an opposite direction of the optical path from being reflected again
Data Source
AI summary
An image display apparatus according to an embodiment of the present technology includes a polarizer, a polarization conversion element, and a ¼ wave plate. The polarizer causes to transmit linearly polarized light having a predetermined polarization direction. The polarization conversion element converts a polarization state of the linearly polarized light transmitted through the polarizer and emits the light as light in a non-polarized state. The ¼ wave plate is arranged on an optical path of the light in the non-polarized state emitted from the polarization conversion element.