Projection Display Optical Shifting to Reduce Alignment Defect Visibility
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Solution Overview
Problem
Recent liquid crystal panels with reduced pixel electrode gaps cause alignment defects in liquid crystals, leading to display defects that deteriorate display quality when projection positions are shifted optically to enhance resolution.
Innovation Solution
A projection display device with a liquid crystal panel and an optical path shifting element that adjusts projection positions for each unit period within a frame, controlled by a display control circuit to supply data signals and manage light paths, mitigating alignment defects by overshooting projection positions during flyback periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the projection position is shifted by the optical path shifting element to achieve pseudo increase in resolution, then the perceived resolution is improved, but the alignment defect caused by adjacent pixel electrodes is visually extended and display quality deteriorates
Solution Approach 1:
The optical path shifting element performs preliminary positioning adjustment during the flyback period before the main projection period. By overshooting the target projection position during flyback and then returning to the correct position, the system prepares the projection path in advance to avoid displaying alignment defects during the critical projection phase.
Solution Approach 2:
During the flyback period, the optical path shifting element rapidly moves the projection position through the target location (overshooting), then corrects it back. This rushing through the target position during flyback allows the system to skip the problematic alignment defect display period and establish the correct projection position before the next frame begins.
2Manufacturing precision
If recent liquid crystal panels are downsized with reduced pixel electrode gaps to increase definition, then the panel density is improved, but the electric field between adjacent pixel electrodes causes alignment defect of liquid crystal
Solution Approach 1:
The system performs preliminary positioning adjustment during the flyback period before the main projection period. By overshooting the target projection position during flyback and then returning to the correct position, the system prepares the projection path in advance to avoid displaying alignment defects during the critical projection phase.
Solution Approach 2:
The optical path shifting element operates periodically, alternating between the projection period and the flyback period. During the flyback period, it performs positioning adjustments including overshooting and returning to the target position, creating a periodic cycle that separates the problematic alignment defect display from the correct projection display.
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 effectively reduces the visibility of display quality deterioration caused by alignment defects, enhancing perceived resolution without noticeable display flaws.
Implementation Method 1
an optical path shifting element configured to shift an optical path of projection light projected from the panel pixel to make a projection position of a projected pixel displayed by the projection light different for each of k unit periods
Implementation Method 2
a liquid crystal panel including a panel pixel
Implementation Method 3
an electric field generated between adjacent pixel electrodes causes alignment defect of the liquid crystal
Data Source
AI summary
A projection display device including a liquid crystal panel including a panel pixel, an optical path shifting element that shifts a projection position of a projection pixel projected every four unit period for example, and a display control circuit that controls the liquid crystal panel and the optical path shifting element are provided. The display control circuit supplies a data signal corresponding to a gradation level designated by video pixel data in video data to the panel pixel for each of the unit periods, controls the projection position for each of the unit periods for the optical path shifting element, and the optical path shifting element causes shifting to a target projection position that is a target in response to passage of the target projection position, for each unit period.