LCD Pixel Structure with Polymer Alignment for Wide Viewing Angles
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Solution Overview
Problem
Conventional LCD panels suffer from color wash-out when viewed at large angles due to the inclination of liquid crystal molecules, and they have limited aperture ratio, which affects luminance and viewing angle performance.
Innovation Solution
A pixel structure comprising an active device, first and second pixel electrodes with stripped electrode patterns, a coupling line, a common electrode, and a liquid crystal layer with polymer layers, where the liquid crystal molecules are aligned between the polymer layers, and the coupling line and second pixel electrode form a coupling capacitor, allowing adjustment of capacitance to control the inclination of liquid crystal molecules, thereby eliminating color wash-out and enhancing aperture ratio and luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If protrusions are added to the common electrode to increase viewing angle, then the viewing angle scope is improved, but the aperture ratio decreases and color wash-out occurs at large angles
Solution Approach 1:
The invention removes the protrusions from the common electrode that were causing the technical contradiction. By extracting these protruding structures, the aperture ratio is increased while the viewing angle requirements are met through an alternative mechanism using polymer alignment layers and electrode patterns.
Solution Approach 2:
The invention replaces the mechanical protrusion structure with a polymer-based alignment system. Instead of using physical protrusions to control liquid crystal orientation, the patent uses polymer layers with specific alignment properties and electrode patterns to achieve the desired liquid crystal inclination and wide viewing angle without compromising aperture ratio.
2Adaptability or versatility
If protrusions are added to the common electrode to increase viewing angle, then the viewing angle scope is improved, but color wash-out occurs when viewed at large angles
Solution Approach 1:
The invention removes the protrusions that caused color wash-out at large viewing angles. By extracting these structures, the harmful optical effects are eliminated while maintaining wide viewing angle performance through the polymer alignment mechanism.
Solution Approach 2:
The patent replaces the protrusion-based alignment mechanism with a polymer layer-based system that provides superior optical performance. The polymer alignment layers create uniform liquid crystal orientation that prevents color wash-out while maintaining wide viewing angles.
3Illumination intensity
If the aperture ratio is increased to enhance luminance, then the luminance is improved, but the viewing angle and color performance may deteriorate
Solution Approach 1:
The invention replaces the traditional protrusion-based viewing angle control with a polymer alignment system that is compatible with high aperture ratio designs. This substitution allows the liquid crystal molecules to be properly aligned for wide viewing angles without requiring physical protrusions that would reduce the aperture area.
Solution Approach 2:
The patent changes the alignment mechanism from mechanical protrusions to polymer layer orientation control. This parameter change in the alignment approach enables simultaneous achievement of high aperture ratio for luminance and wide viewing angle performance.
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 pixel structure effectively eliminates color wash-out and increases the aperture ratio and luminance of LCD panels by controlling the inclination of liquid crystal molecules, achieving improved viewing angles without the need for protrusions.
Implementation Method 1
the liquid crystal layer has a liquid crystal molecule layer and two polymer layers, and the liquid crystal molecule layer is disposed between the polymer layers
Implementation Method 2
the coupling line and second pixel electrode form a coupling capacitor, allowing adjustment of capacitance to control the inclination of liquid crystal molecules
Data Source
AI summary
A pixel structure including an active device, a first pixel electrode, a second pixel electrode, a coupling line, a common electrode, and a liquid crystal layer is provided. The first pixel electrode and the second pixel electrode have a plurality of sets of stripped electrode patterns extending along different directions, respectively, and the first pixel electrode is electrically insulated from the second pixel electrode. The coupling line is disposed under the first and the second pixel electrode and electrically insulated from the second pixel electrode. The first pixel electrode is electrically connected to the active device through the coupling line. The common electrode is disposed over the first and the second pixel electrode. The liquid crystal layer is disposed between the common electrode and the first and second pixel electrodes. Moreover, the liquid crystal layer has two polymer layers and a liquid crystal molecule layer disposed between the polymer layers.