Projection Display Pixel Shift Using Two Panels and One Prism
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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 that combines image light from two liquid crystal panels using an optical combination system with a light path shift element, controlled by a display control circuit to shift light paths and synchronize image data, allowing for high-resolution color display 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 the display resolution is improved, but the device complexity and cost increase
Solution Approach 1:
The patent merges the functions of multiple liquid crystal panels and multiple prisms into a simplified configuration using only two liquid crystal panels and one prism. The optical combination system integrates the light paths from both panels through the single prism to achieve high-resolution color display without requiring six panels and three prisms as in conventional systems.
Solution Approach 2:
Each liquid crystal panel is designed to perform multiple functions: displaying different color components (R, G, B) at different time points, and contributing to different regions of the final image. The single prism serves multiple purposes by combining light paths, separating color components, and directing light to the screen, replacing the need for multiple specialized prisms.
2Measurement precision
If multiple liquid crystal panels and prisms are used to achieve high-resolution color display, then the display resolution is improved, but the manufacturing cost increases
Solution Approach 1:
The patent reduces the total number of optical components by merging functions into fewer elements. Instead of manufacturing and assembling six liquid crystal panels and three prisms, the system uses only two panels and one prism, directly reducing material costs, assembly costs, and quality control complexity.
Solution Approach 2:
The system uses two liquid crystal panels that are driven to display different sets of color components at different time points (first panel displays R1, G1, B1 at odd fields and R2, G2, B2 at even fields; second panel displays complementary information). This temporal copying approach replaces the need for multiple simultaneous panels, reducing manufacturing requirements.
3Measurement precision
If the second image light is shifted relative to the first image light and combined, then the high-resolution display is achieved, but the light path control complexity increases
Solution Approach 1:
The system uses periodic switching between odd and even field periods to control which panel displays which color components. During odd field periods, the first panel displays certain colors while the second panel displays others; during even field periods, the roles are reversed. This periodic control simplifies the light path management compared to simultaneous multi-panel control.
Solution Approach 2:
The light path configuration is made dynamic through time-division multiplexing. The system dynamically switches which panel contributes which color components to the final image based on the field period (odd or even). This dynamic control allows two panels to effectively perform the work of multiple panels with simpler light path management.
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
The solution achieves high-resolution color display with a simplified configuration and reduced costs by optimizing the use of liquid crystal panels and prisms, enhancing image quality and efficiency.
Implementation Method 1
an optical combination system configured to combine the first image light with the second image light in a state in which the second image light is shifted in a first direction relative to the first image light, and emit combination light, 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 panel that generates a first image, a second 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 a first pixel and outputs a combination image, a light path shift element, and a display control circuit. The display control circuit supplies data signals of odd-numbered rows to the first panel and supplies data signals of even-numbered rows to the second panel in an odd-numbered field period, and supplies data signals of even-numbered rows to the first panel and supplies data signals of even-numbered rows to the second panel in an even-numbered field period, and controls the light path shift element so that a light path of the combination image is shifted in a vertical direction.