Liquid Crystal Display Panel Vertical Alignment UV Treatment
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Solution Overview
Problem
Liquid crystal display panels, particularly in the VA mode, face challenges with poor view angles and color shifting due to large birefringence differences, while IPS and FFS modes have low contrast, limiting their performance in terms of wide view angles and high transmittance.
Innovation Solution
A liquid crystal display panel design incorporating a TFT substrate with a first and second alignment film, subjected to UV light irradiation, allowing for vertical light alignment and pre-tilt angles, combined with a CF substrate, to achieve nearly vertical alignment of liquid crystal molecules, which rotate horizontally upon electric field application, enhancing contrast and view angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If VA mode liquid crystal display is used, then high contrast and high transmittance are achieved, but view angle is poor and color shifting occurs at large view angles
Solution Approach 1:
The pixel electrode is divided into multiple electrode regions with different orientations. Specifically, the pixel electrode includes a first electrode region with first electrode segments extending in a first direction and a second electrode region with second electrode segments extending in a second direction different from the first direction. This segmentation allows different regions to control liquid crystal molecules in different orientations, thereby expanding the effective view angle while maintaining high contrast characteristics of VA mode.
Solution Approach 2:
Different regions of the pixel electrode are assigned different local qualities in terms of electrode segment orientation. The first electrode segments and second electrode segments are arranged in different directions to create localized electric field orientations that correspond to different viewing zones. This local quality variation enables the display to maintain optimal performance across multiple viewing angles.
2Adaptability or versatility
If IPS mode or FFS mode liquid crystal display is used, then wide view angles are achieved, but contrast is poor
Solution Approach 1:
The invention merges the advantages of VA mode (high contrast) with the wide view angle characteristics of IPS/FFS modes by combining vertical alignment liquid crystal molecules with multi-directional electrode segments. The liquid crystal molecules are initially aligned vertically perpendicular to the substrate, maintaining VA mode's high contrast, while the multi-directional electrode segments induce horizontal rotation components that enable wide viewing angles similar to IPS/FFS modes.
3Adaptability or versatility
If multi-domain VA techniques are adopted to alleviate color shifting, then color shifting is reduced, but device complexity increases due to multiple electrode regions
Solution Approach 1:
The invention extracts the essential function of multi-domain control from complex multi-electrode structures and implements it through a simplified pixel electrode design with only two electrode regions. By taking out the core requirement of multi-directional control and implementing it through minimal electrode segments, the device achieves color stability without the complexity of traditional multi-domain VA techniques that require multiple independent electrode structures.
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
The solution provides a high contrast and wide view angle performance by ensuring low light leakage in the dark state and enabling liquid crystal molecules to rotate parallel to the substrates when an electric field is applied, combining the advantages of IPS and FFS modes.
Implementation Method 1
the first alignment film being subjected to first light irradiation treatment to have the first alignment film define a first pre-tilt angle with respect to the first base plate; the second alignment film being subjected to second light irradiation treatment to have the second alignment film define a second pre-tilt angle with respect to the second substrate
Implementation Method 2
the liquid crystal molecules rotating horizontally upon application of an electric field for displaying
Data Source
AI summary
The present invention provides a liquid crystal display panel. The liquid crystal display panel includes a TFT substrate and a CF substrate that are respectively provided with first and second alignment films that allow for vertical light alignment, so that after irradiation of ultraviolet light, the first alignment film and the second alignment film have alignment directions that are substantially parallel but opposite to each other and the liquid crystal molecules are set at a tilt angle for being nearly vertically aligned. In a dark state where no electricity is applied, the liquid crystal molecules are arranged to be nearly perpendicular to surfaces of the TFT substrate and the CF substrate with no phase difference so that light leakage is extremely low and the dark state brightness is small thereby achieving a relatively high contrast; and after the application of a displaying electric field, the liquid crystal molecules are cause to rotate on a plane substantially parallel to the surfaces of the TFT substrate and the CF substrate so as to provide characteristics of a wide view angle and high transmittance offered by an IPS mode and an FFS mode.