Projection Display Light-Path Shifting 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 a complex configuration and increased costs.
Innovation Solution
A projection display device utilizing a first and second image light emission device that emits color light components in a time-division manner, combined by an optical system with a light path shift element, controlled by a display control circuit to align and shift light paths, reducing the need for multiple prisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple liquid crystal panels and prisms are used to achieve high-resolution color display, then display resolution and color quality are improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the functions of multiple liquid crystal panels and multiple prisms into a single liquid crystal panel and single prism configuration. By using a light path shift element to dynamically redirect light between different pixel regions, the system achieves the high-resolution color display capability that previously required six separate panels and three prisms, thereby simplifying the overall device structure while maintaining display quality
Solution Approach 2:
The patent introduces a light path shift element that dynamically changes the optical path during operation. This dynamic light path control allows a single liquid crystal panel to serve multiple functions that previously required multiple static panels, enabling the system to achieve high-resolution color display with reduced component count by actively routing light between different pixel regions based on the required color information
2Manufacturing precision
If multiple liquid crystal panels and prisms are used to achieve high-resolution color display, then display resolution and color quality are improved, but manufacturing cost increases
Solution Approach 1:
The patent merges the functionality of six liquid crystal panels and three prisms into a single panel and single prism system with dynamic light path control. This consolidation reduces the number of components that need to be manufactured, assembled, and aligned, thereby significantly lowering manufacturing costs while maintaining the high-resolution color display capability
3Device complexity
If time-division multiplexing is used to control light path shifting, then component count is reduced, but processing complexity increases
Solution Approach 1:
The patent employs time-division multiplexing with periodic light path shifting, where the light path shift element alternates between different positions in synchronization with the display refresh cycle. This periodic operation allows a single liquid crystal panel to sequentially display different color components (R, G, B) for different pixel regions, achieving high-resolution color display with fewer components while the control complexity is managed through synchronized periodic switching
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 a simplified configuration and reduced costs by optimizing the use of liquid crystal panels and light path manipulation.
Implementation Method 1
an optical combination system configured to combine the first image light with the second image light
Implementation Method 2
a light path shift element configured to shift a light path for the combination light emitted from the optical combination system
Data Source
AI summary
A projection display device including a first liquid crystal panel that generates a first image, a second liquid crystal panel that generates a second image, a prism that combines the first image with the second image shifted in a horizontal direction with respect to the first pixel and outputs a combination image, a light path shift element, and a display control circuit that controls the first liquid crystal panel, the second liquid crystal panel and the light path shift element. The display control circuit supplies a data signal of a first color component in an odd-numbered row of video pixel data to the first liquid crystal panel in a first unit period, and supplies the same data signal of the same first color component in an even-numbered row of the video pixel data to the first liquid crystal panel in a second unit period.