Liquid Crystal Projector Pixel Shifting Alignment Defect Reduction
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Solution Overview
Problem
In liquid crystal projectors, the miniaturization and high definition of liquid crystal panels lead to alignment failures due to lateral electric fields, causing defects that are exacerbated by pixel shifting techniques, resulting in degraded display quality.
Innovation Solution
A liquid crystal projector design where the pixel circuit modulates n pixels in one frame period differently from the next, shifting the position of projected pixels to avoid continuous alignment failures by changing the combination of represented pixels between frame periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pixel position is shifted by the shift device to increase resolution, then more pixels are projected than the number of pixels represented by the liquid crystal panel, but the defect on display due to alignment failure is extended in the shifted direction and visually recognized, thus display quality is significantly degraded
Solution Approach 1:
The patent applies periodic action by alternating the pixel grouping pattern between consecutive frame periods. In the first frame period, pixels are grouped as (0,0), (0,1), (1,0), (1,1), and in the second frame period, the grouping is shifted to (1,0), (1,1), (0,0), (0,1). This periodic reconfiguration prevents alignment defects from being consistently extended in the same direction, thereby reducing their visual recognition while maintaining the resolution enhancement benefit of pixel shifting.
2Measurement precision
If the liquid crystal panel is miniaturized and high definition is achieved with narrower gaps between pixel electrodes, then the panel size is reduced and resolution is improved, but the lateral electric field influence increases causing liquid crystal alignment failure
Solution Approach 1:
The patent applies dynamics by making the pixel grouping configuration changeable over time. The pixel circuit dynamically switches between different grouping patterns in alternating frame periods, which prevents the lateral electric field from consistently affecting the same pixel boundaries. This dynamic reconfiguration reduces alignment failure while maintaining high definition and miniaturization benefits.
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 approach reduces the visibility of alignment failures, enhancing display quality by ensuring that alignment defects are not consistently extended and recognized over time, thereby improving the overall image presentation.
Implementation Method 1
a liquid crystal panel having a pixel circuit that modulates light based on video data corresponding to each of pixels
Implementation Method 2
a shift device configured to shift the modulated light by the pixel circuit so that a position of a projected pixel on a screen by the modulated light is shifted
Data Source
AI summary
A liquid crystal projector includes a liquid crystal panel having a pixel circuit that modulates light based on video data corresponding to each of pixels, and a shift device configured to shift the modulated light by the pixel circuit so that a position of a projected pixel on a screen by the modulated light is shifted for each of the pixels, wherein the pixel circuit modulates n pixels of a first group, n being an integer of 2 or more, from among pixels of an image specified by video data in first frame period, and modulates n pixels of a second group in second frame period next to the first frame period, and the n pixels of the first group are different from the n pixels of the second group.