Liquid Crystal Display Pixel Electrode Area Ratio Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In liquid-crystal display apparatus operating in the FFS mode, variations in pixel electric potentials due to differences in signal storage capacitor capacitance among red, green, and blue pixels lead to undesirable variations in display quality, including VT characteristics, flickers, and residual-image and burn-in issues.
Innovation Solution
The liquid-crystal display apparatus is designed with varying pixel areas for red, green, and blue pixels, and the ratio of electrode area to pixel area is controlled for each color, allowing independent capacitance adjustment of signal storage capacitors to maintain uniform pixel electric potentials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If pixel areas are varied for different colors (red, green, blue), then color tone and color temperature can be controlled, but signal storage capacitor capacitance varies among pixels causing non-uniform pixel electric potentials
Solution Approach 1:
The patent applies local quality by making each color pixel (red, green, blue) have different pixel areas to control color output, while simultaneously giving each pixel's electrode a specific area ratio relative to its pixel area. This local differentiation allows customization of each pixel's characteristics while maintaining overall system uniformity through controlled electrode-to-pixel area ratios.
Solution Approach 2:
The patent changes the parameter of electrode area to pixel area ratio as a control variable. By adjusting this ratio for pixels with different areas, the signal storage capacitor capacitance is normalized across all pixels, ensuring uniform electric potentials despite varying pixel sizes. This parameter change resolves the contradiction between color optimization and electrical uniformity.
2Reliability
If signal storage capacitor capacitance is normalized across all pixels, then pixel electric potentials become uniform, but this requires complex electrode area ratio control for each color pixel
Solution Approach 1:
The patent introduces a new controllable parameter - the electrode area to pixel area ratio - that can be adjusted to normalize capacitor capacitance. By changing this geometric parameter, the system achieves electrical uniformity without adding complex circuitry or control mechanisms, thus managing device complexity while improving reliability.
3Ease of manufacture
If all pixels have equal electrode areas, then manufacturing is simpler, but pixels with different areas will have different capacitances causing display quality variations
Solution Approach 1:
The patent applies local quality by allowing different electrode area to pixel area ratios for different color pixels. This enables each pixel type to be optimized for its specific function while maintaining manufacturing simplicity, as the ratio control is incorporated into the patterning process rather than requiring separate manufacturing steps.
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 ensures uniformity in pixel characteristics, improving display quality by controlling color tone and color temperature while sustaining color reproducibility and reducing flickers and burn-in.
Implementation Method 1
a liquid-crystal mode for implementing a large visual field angle and high contrast. In particular, in comparison with an IPS (In-Plane Switching) mode, the FFS (Fringe Field Switching) mode provides an improved aperture ratio and an improved transmission
Implementation Method 2
driving liquid-crystal molecules in an FFS (Fringe Field Switching) mode
Data Source
AI summary
Disclosed herein is a display apparatus including a first substrate patterned to create pixel electrodes, a second substrate placed to face the first substrate and a liquid-crystal layer sandwiched by the first and second substrates wherein: one of the first and second substrates is patterned to create color filters each provided for one of a plurality of different colors as color filters each associated with one of the pixel electrodes each included in one of pixels each provided for one of the different colors; each of the pixels each provided for one of the different colors has a pixel area which varies from color to color; and the ratio of the electrode area of any particular one of the pixel electrodes to the pixel area of the pixel that includes the particular pixel electrode varies from color to color.