FFS Electrode Gap Ratio Variation for Display Uniformity
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Solution Overview
Problem
Conventional fringe field switching (FFS) liquid crystal display devices experience display unevenness due to variations in the dimensions of the gap and branch electrode parts of the upper electrode, affecting light transmittance during the manufacturing process.
Innovation Solution
The FFS-type liquid crystal display device incorporates an upper electrode with varying ratios of gap to branch electrode widths, including regions that increase and decrease light transmittance, effectively canceling out these variations to minimize display unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the width of gap parts or branch electrode parts of the upper electrode is optimized for light transmittance, then light transmittance is improved, but display unevenness occurs due to manufacturing process variations
Solution Approach 1:
The upper electrode is divided into multiple regions with different gap part width to branch electrode part width ratios. Specifically, a first region has a first ratio and a second region has a second ratio that differs from the first ratio. This local variation in geometric proportions allows different areas to compensate for each other's manufacturing variations, reducing overall display unevenness while maintaining good light transmittance characteristics.
2Ease of manufacture
If the upper electrode uses uniform gap and branch electrode dimensions, then manufacturing is simplified, but display unevenness occurs due to process variations
Solution Approach 1:
The upper electrode is divided into multiple regions with different gap part width to branch electrode part width ratios. Specifically, a first region has a first ratio and a second region has a second ratio that differs from the first ratio. This local variation in geometric proportions allows different areas to compensate for each other's manufacturing variations, reducing overall display unevenness while maintaining good light transmittance characteristics.
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 design reduces display unevenness by balancing light transmittance changes across the pixel area, ensuring consistent performance despite manufacturing dimension variations.
Implementation Method 1
a fringe field switching (FFS) system has been suggested... The FFS-type liquid crystal display device is the system of achieving the display by applying a fringe electric field (an oblique electric field including both components of a horizontal electric field and a vertical electric field) to a liquid crystal layer
Implementation Method 2
The liquid crystal display device includes a liquid crystal layer disposed between two substrates
Data Source
AI summary
A pixel of a liquid crystal display device includes a scan line, a signal line, a TFT, a lower electrode, and an upper electrode arranged thereon with a protection film interposed therebetween, in which the upper electrode includes a plurality of branch electrode parts electrically connected in common, and a gap part between the branch electrode parts. The upper electrode includes a region in which a ratio of a width of the gap part to a width of the branch electrode part that is adjacent to the gap part is different, and includes both of a region in which a light transmittance increases and a region in which the light transmittance decreases with respect to a change in the ratio.