Liquid Crystal Display Pixel Electrode Angles
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Solution Overview
Problem
Liquid crystal display devices face challenges in achieving wide viewing angles and high brightness while maintaining low power consumption, particularly due to insufficient electric field intensity in in-plane switching regions, which affects transmittance and requires higher driving voltages.
Innovation Solution
The design includes a liquid crystal panel with pixel electrodes having straight parts at specific angles, a common electrode, and a driver circuit that supplies pixel potentials with opposite polarities, optimizing the electric field distribution and initial alignment of liquid crystal molecules to enhance transmittance and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a horizontal electric field type liquid crystal display device is employed to achieve wide viewing angle, then viewing angle is improved, but electric field intensity in in-plane switching regions becomes insufficient
Solution Approach 1:
The pixel electrode is divided into multiple straight parts with different orientations. Each straight part creates a localized electric field pattern optimized for its region, with at least one straight part forming an angle of 15° to 75° with the reference line. This local variation in electrode geometry creates enhanced electric field intensity in specific in-plane switching regions while maintaining the horizontal electric field configuration for wide viewing angle.
2Force
If higher driving voltage is applied to compensate for insufficient electric field intensity, then electric field intensity is improved, but power consumption increases
Solution Approach 1:
The invention changes the geometric parameters of the pixel electrode by introducing multiple straight parts with specific angular orientations (15° to 75° relative to reference line). This parameter modification optimizes the electric field distribution pattern, achieving sufficient electric field intensity in in-plane switching regions at lower driving voltages, thereby reducing power consumption while maintaining display performance.
3Illumination intensity
If the angle of straight parts is optimized to enhance electric field intensity, then transmittance is improved, but device complexity increases
Solution Approach 1:
The pixel electrode is segmented into multiple straight parts, each contributing to the overall electric field pattern. This segmentation allows optimization of transmittance through controlled angular orientations (15° to 75°) of individual segments while keeping each segment structurally simple. The segmented design achieves enhanced electric field intensity and improved transmittance without requiring complex three-dimensional structures or additional components.
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 achieves higher peak brightness and reduced power consumption by optimizing the angle of bend in pixel electrodes, ensuring sufficient electric field intensity for both fringe-field switching and in-plane switching regions, thereby improving the overall transmittance and viewing angle performance.
Implementation Method 1
an alignment film on the first insulative substrate... initial alignment of the liquid crystal layer defined by the alignment film
Implementation Method 2
Electric fields between the plurality of straight parts and the common electrode are applied to the negative type of liquid crystal material
Implementation Method 3
a liquid crystal layer of a negative type of liquid crystal material sandwiched between the element substrate and the opposite substrate
Data Source
AI summary
Pixel electrodes adjacent to each other along a first axis are supplied with pixel potentials having opposite polarities with respect to a potential of a common electrode. The pixel electrode includes straight parts. Electric fields between the straight parts and the common electrode are applied to negative type liquid crystal material. An electric field between the straight parts of the adjacent pixel electrodes is applied to the negative type liquid crystal material. An opposite substrate includes a second region opposed to a first region between the straight parts of the adjacent pixel electrodes. At least a part of visible light transmitted through the first region is transmitted through the second region. Angles of the straight parts with respect to an axis perpendicular to direction of initial alignment of the liquid crystal material have a size of not less than 15° and not more than 30°.