Projection Display With Shifted Image Paths for High-Resolution Color
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Solution Overview
Problem
Existing projection display devices require multiple liquid crystal panels and prisms to achieve high-resolution color display, leading to increased complexity and cost.
Innovation Solution
A projection display device configuration that uses two image light emission devices with shifted image light paths, combined by an optical system, and controlled by a display circuit to emit image light in alternating field periods, allowing for high-resolution image projection with reduced components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple liquid crystal panels and prisms are used to achieve high-resolution color display, then display resolution is improved, but device complexity increases
Solution Approach 1:
The patent combines the functions of multiple liquid crystal panels and prisms into a single liquid crystal panel with divided pixel regions. The first and second liquid crystal panels are merged into one panel where pixels are divided into first pixel regions and second pixel regions, eliminating the need for separate prisms while maintaining high-resolution color display capabilities.
Solution Approach 2:
The single liquid crystal panel performs multiple functions that previously required separate components. The panel simultaneously displays first image light from first pixel regions and second image light from second pixel regions, replacing the multi-panel prism system with a universal single-panel device that achieves the same high-resolution color display.
2Measurement precision
If multiple liquid crystal panels and prisms are used to achieve high-resolution color display, then display resolution is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges multiple liquid crystal panels and prisms into a single liquid crystal panel structure, reducing the total number of components that need to be manufactured, assembled, and aligned. This consolidation directly reduces manufacturing complexity and cost while maintaining the high-resolution color display function.
Solution Approach 2:
The patent extracts and eliminates the prisms from the system by integrating their light-combining function directly into the liquid crystal panel structure. This removal of unnecessary components simplifies the manufacturing process and reduces material costs while preserving the high-resolution display capability.
3Measurement precision
If image light paths are shifted and combined to achieve high resolution, then display resolution is improved, but positional accuracy requirements increase
Solution Approach 1:
The patent segments the liquid crystal panel into distinct first pixel regions and second pixel regions that emit different image lights. This segmentation allows each region to be independently controlled and positioned, reducing the overall positional accuracy requirements compared to shifting entire image light paths using prisms.
Solution Approach 2:
The patent replaces the mechanical prism-based light path shifting system with an electronic control system that selectively activates different pixel regions. This substitution eliminates mechanical alignment requirements and reduces positional accuracy constraints by using electrical control instead of mechanical positioning.
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
Achieves high-resolution color display with reduced complexity and cost by utilizing fewer liquid crystal panels and prisms, while maintaining high positional accuracy and production efficiency.
Implementation Method 1
a first light path shift element provided between the first image light emission device and the optical combination system, and configured to shift a light path of the first image light emitted from the first image light emission device
Implementation Method 2
an optical combination system configured to combine, and emit as composite light, the first image light and the second image light
Implementation Method 3
a second light path shift element configured to shift a light path of the composite light emitted from the optical combination system
Data Source
AI summary
A projection display device includes a first light emission device that emits a first image light, a second light emission device that emits a second image light, a prism that combines the first image light and the second image light, a position adjustment element that shifts the light path of the first image light, a light path shift element that shifts the light path of a combined image light from the prism, and a display control circuit. In an odd-numbered field period, the display control circuit supplies to the first light emission device a data signal of odd-numbered rows and supplies to the second light emission device a data signal of even-numbered rows. In the even-numbered field period, the display control circuit supplies to the first light emission device a data signal of even-numbered rows, and supplies to the second light emission device a data signal of even-numbered rows.