LCD Pixel Electrode Layout for Viewing Angle and Transmissivity
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Solution Overview
Problem
Conventional liquid crystal display (LCD) technologies face challenges in improving both optical transmissivity and viewing angle, with existing methods like in-plane switching (IPS) and vertical alignment (VA) modes struggling to enhance these aspects simultaneously.
Innovation Solution
The design incorporates a liquid crystal display panel with a first substrate featuring gate lines, data lines, and a pixel electrode with inclined first and second pixel electrode parts, and a second substrate with a common electrode alternately positioned, along with a wedge-shaped third pixel electrode part forming a storage capacitor, to optimize optical transmissivity and viewing angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional LCD modes (IPS or VA) are used, then the viewing angle can be improved, but the optical transmissivity deteriorates
Solution Approach 1:
The pixel electrode is divided into multiple segments (first pixel electrode part, second pixel electrode part, and third pixel electrode part) with different orientations. The first and second pixel electrode parts are inclined in different directions with respect to gate lines, while the third pixel electrode part is substantially parallel to gate lines. This segmentation allows different regions to contribute to different aspects of performance, resolving the contradiction between viewing angle and optical transmissivity.
Solution Approach 2:
Different portions of the pixel electrode are assigned different local qualities (orientations). The first and second pixel electrode parts have inclined orientations to improve viewing angle, while the third pixel electrode part has a parallel orientation to maximize optical transmissivity. This local differentiation allows simultaneous optimization of both parameters.
2Adaptability or versatility
If the pixel electrode is inclined to improve viewing angle, then the viewing angle is improved, but parasite capacitance increases
Solution Approach 1:
The pixel electrode is segmented into multiple parts with different orientations. The third pixel electrode part is specifically designed to be substantially parallel to gate lines, which minimizes the overlap area and reduces parasite capacitance between the pixel electrode and gate lines, while the first and second parts provide the inclined orientation for improved viewing angle.
Solution Approach 2:
Different local regions of the pixel electrode have different orientations optimized for different functions. The third pixel electrode part has a parallel orientation to gate lines specifically to reduce parasite capacitance in regions where overlap would be most problematic, while other regions maintain inclined orientations for viewing angle improvement.
3Quantity of substance
If the pixel electrode covers the lower electrode completely, then the capacitance is increased, but the optical transmissivity deteriorates
Solution Approach 1:
The pixel electrode is divided into multiple segments that cover different portions of the lower electrode. The third pixel electrode part is positioned to cover the lower electrode to form a storage capacitor, while the first and second parts are inclined and may not completely cover the lower electrode. This segmented coverage allows sufficient capacitance formation while maintaining optical transmissivity through the non-covered regions.
Solution Approach 2:
Different regions of the pixel electrode have different coverage characteristics over the lower electrode. The third pixel electrode part provides local coverage to form the storage capacitor where capacitance is needed, while other regions maintain lower coverage to preserve optical transmissivity. This local differentiation resolves the contradiction between capacitance and optical transmissivity.
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 enhances optical transmissivity and viewing angle by allowing liquid crystal molecules to rotate uniformly, preventing texture appearance and reducing parasite capacitance, while maintaining high capacitance and optical efficiency.
Implementation Method 1
an electric field of horizontal direction is applied to the liquid crystal layer to twist the liquid crystal direction
Implementation Method 2
a liquid crystal layer disposed between the array substrate and counter substrate whose optical transmissivity changes in response to the electrical signals applied to the pixels
Data Source
AI summary
A liquid crystal display panel having improved optical transmissivity and viewing angle includes a first substrate, a second substrate and a liquid crystal layer. The first substrate includes a first base substrate, a plurality of gate lines and a plurality of data lines, and a pixel electrode. The gate lines and the data lines are disposed on the first base substrate and cross each other. The pixel electrode includes a first pixel electrode part and a second pixel electrode part disposed on the first base substrate and inclined in a different direction from each other with respect to the gate lines. The second substrate includes a second base substrate and a common electrode disposed on the second base substrate and alternately positioned with the pixel electrode.