Liquid Crystal Device Pixel Electrode Pairing for Aperture Ratio
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Solution Overview
Problem
In liquid crystal devices used in projectors, the small pixel size leads to significant light diffraction due to non-aperture regions, resulting in a dark and poorly lit image, as the optical path of light is bent and not received by the projection lens.
Innovation Solution
The liquid crystal device design includes pixel electrodes arranged in pairs adjacent to each other and between scanning lines, with switching elements connected alternately to data lines, reducing the non-aperture region area and increasing the aperture ratio, thereby minimizing diffraction. Additionally, a shielding film can be used to prevent light leakage and further enhance display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pixel size is reduced to improve display resolution, then display quality is improved, but diffraction influence increases causing image darkness
Solution Approach 1:
The patent divides the aperture into multiple sub-apertures by arranging pixel electrodes in pairs with gaps between them. This segmentation allows light to pass through multiple smaller openings instead of one large opening, reducing the diffraction effect while maintaining the overall aperture area for high-resolution display
Solution Approach 2:
The patent introduces a vertical dimension by stacking pixel electrodes in the data line direction, creating multiple aperture rows. This dimensional change allows the aperture ratio to be increased without increasing the horizontal pixel size, thereby reducing diffraction while maintaining resolution
2Illumination intensity
If non-aperture region area is reduced to increase aperture ratio, then diffraction influence is reduced, but device complexity increases due to switching element arrangement
Solution Approach 1:
The patent merges the control function of multiple pixel electrodes into a single switching element by connecting them in parallel through data lines. This allows multiple pixel electrodes to be controlled simultaneously, reducing the number of switching elements needed and simplifying the overall device structure while maintaining high aperture ratio
Solution Approach 2:
The patent arranges switching elements in the vertical dimension by connecting them to data lines in the data line direction. This spatial arrangement allows multiple switching elements to share common data lines, reducing the horizontal space required and simplifying the routing complexity
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 configuration increases the aperture ratio, reducing diffraction and improving the brightness and display quality of the projector by ensuring more image light enters the projection lens, allowing for normal image and text display with balanced brightness across the image.
Implementation Method 1
liquid crystal is sandwiched between a pair of substrates... By applying the voltage between the common electrode and the pixel electrodes, the liquid crystal is driven, and the transmittance for incident light is changed in each pixel
Implementation Method 2
light diffraction occurs at the ends of the apertures... when the pixel size is small (e.g., 6 μm or less), a quite high proportion of transmitted light is influenced by diffraction
Data Source
AI summary
A liquid crystal device includes a pair of substrates between which liquid crystal is sandwiched, a plurality of pixel electrodes arranged in a matrix on one of the substrates, switching elements that control the supply of current to the pixel electrodes, scanning lines that supply scanning signals to the switching elements, and data lines that cross the scanning lines and that supply image signals to the switching elements. The pixel electrodes are arranged in pairs, and each pair of the pixel electrodes are adjacent in an extending direction of the data lines and are disposed between a corresponding pair of the scanning lines in the extending direction of the data lines. The switching elements corresponding to each line of the pixel electrodes arrayed in the extending direction of the data lines are alternately connected to either of opposing sides of an adjacent pair of the data lines in the extending direction of the data lines.