Common Electrode Slits for Liquid Crystal White Balance
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Solution Overview
Problem
Liquid crystal display devices face challenges in maintaining white balance due to differences in peak transmittance voltages among red, green, and blue color pixels, leading to displacement in V-T characteristics and reduced display quality.
Innovation Solution
The design includes a liquid crystal display panel with a second common electrode having slits of varying areas and ratios opposed to each color pixel electrode, which aligns liquid crystal molecules to maintain initial alignment in blue pixels, reducing obliquity and compensating for wavelength dispersion, thereby maintaining white balance without altering voltage settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a voltage value is set for each color pixel based on its peak transmittance to maintain white balance, then white balance is maintained, but the V-T characteristics become complex and display quality deteriorates due to displacement among color pixels
Solution Approach 1:
The patent applies local quality by creating slits with different areas in the common electrode corresponding to different color pixels. Specifically, the blue color pixel region has a larger slit area compared to red and green color pixel regions, allowing differential light transmission control for each color channel to compensate for V-T characteristic displacement
Solution Approach 2:
The patent changes the physical parameter of the common electrode by introducing slits with varying areas. This structural modification alters the light transmission characteristics locally, enabling compensation for the different peak transmittance voltages of blue, green, and red color pixels without changing the voltage settings
2Illumination intensity
If the area and area ratio of slits in the common electrode are adjusted to align liquid crystal molecules, then white balance is maintained and luminance increases, but device complexity increases
Solution Approach 1:
The patent segments the common electrode into multiple regions with different slit configurations. Each color pixel region (blue, green, red) has slits of specific areas tailored to its V-T characteristics, allowing independent optimization of light transmission for each color channel while maintaining a relatively simple overall electrode structure
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 improves display quality by maintaining white balance and increasing luminance while reducing power consumption and preventing color mixing, even when viewed at oblique angles.
Implementation Method 1
a liquid crystal layer held between the first substrate and the second substrate
Implementation Method 2
aligns liquid crystal molecules to maintain initial alignment in blue pixels
Implementation Method 3
a second substrate including a common electrode having a first slit opposed to the first pixel electrode, a second slit opposed to the second pixel electrode, and a third slit opposed to the third pixel electrode
Data Source
AI summary
According to one embodiment, a display device includes a first substrate including a first pixel electrode disposed in a red color pixel, a second pixel electrode disposed in a green color pixel, and a third pixel electrode disposed in a blue color pixel, a second substrate including a common electrode having a first slit opposed to the first pixel electrode, a second slit opposed to the second pixel electrode, and a third slit opposed to the third pixel electrode, and a liquid crystal layer held between the first substrate and the second substrate, wherein at least one of an area and an area ratio of the third slit is greater than that of the first slit and the second slit.