FFS LCD Pixel Slit Orientation for Color Shift
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Solution Overview
Problem
Conventional fringe field switching (FFS) LCD panels experience color shift and disclination lines at large viewing angles, degrading display quality.
Innovation Solution
The design includes a display panel with pixel units having single-domain pixel electrodes and common electrodes with slit patterns oriented in different directions, along with a color filter layer where the third color filter pattern is disposed corresponding to the third and fourth pixels, reducing color shift and disclination lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If red, blue, and green pixels are designed to have two domains to resolve color shift issue, then color shift is reduced, but disclination lines are generated in the middle of pixels deteriorating display quality
Solution Approach 1:
Instead of dividing each pixel into two domains (conventional approach), the patent inverts the approach by using a single domain per pixel but changing the orientation of slit patterns in the color filter layer. Specifically, the red and green pixels have slit patterns extending in a first direction, while the blue pixel has a slit pattern extending in a second direction perpendicular to the first direction. This inversion resolves color shift without creating disclination lines.
2Adaptability or versatility
If FFS LCD is used to achieve wide viewing angle, then viewing angle is improved, but color shift occurs at large viewing angles
Solution Approach 1:
The patent applies local quality by making the slit pattern orientation pixel-dependent. Specifically, red and green pixels have slit patterns extending in one direction while the blue pixel has slit patterns extending in a perpendicular direction. This localized differentiation in slit pattern orientation compensates for viewing angle effects on a pixel-by-pixel basis, maintaining color accuracy across wide viewing angles.
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 maintains display quality by eliminating disclination lines and reducing color shift at wide viewing angles, ensuring accurate chromatic coordinates and enhanced transmittance.
Implementation Method 1
fringe field switching (FFS) liquid crystal display (LCD) panel
Implementation Method 2
display medium located between the first substrate and the second substrate
Data Source
AI summary
A display panel includes a first substrate, scan lines, data lines, pixel units, a second substrate, a display medium, and a color filter layer. The scan lines and the data lines are disposed on the first substrate. The pixel units are electrically connected to the scan lines and the data lines. Each pixel unit includes first, second, third, and fourth pixels. An extension direction of slit patterns of the first and second pixels is different from an extension direction of at least one of slit patterns of the third and fourth pixels. The color filter layer includes a first color filter pattern disposed corresponding to the first pixel, a second color filter pattern disposed corresponding to the second pixel, and a third color filter pattern disposed corresponding to the third pixel and the fourth pixel.