Pixel Electrode Geometry for LCD Viewing Angle and Transmission
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Solution Overview
Problem
Liquid crystal display devices face limitations in viewing angle due to anisotropy characteristics, leading to image distortion, and altering pixel electrode structures to improve viewing angle results in decreased transmission rates and display quality.
Innovation Solution
A display device design featuring a first pixel electrode with elongated sides and inclined extensions, a second pixel electrode with subpixel electrodes, and a shielding electrode to manage electric fields and reduce distortion, while maintaining or improving transmission rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the structure of pixel electrodes is changed to improve viewing angle, then viewing angle is improved, but transmission rate decreases
Solution Approach 1:
The patent changes the geometric parameters of the pixel electrode, specifically setting interior angles to 135 degrees or more, to simultaneously improve viewing angle and maintain transmission rate. This parameter optimization resolves the contradiction by finding a geometric configuration that benefits both viewing angle and light transmission.
Solution Approach 2:
The patent introduces asymmetric design elements through the specific angular configuration (135 degrees or more) of the pixel electrode sides, which creates optimized electric field distribution that improves viewing angle while preserving transmission characteristics.
2Reliability
If a patterned pixel electrode and common electrode are used to overcome image distortion, then image distortion is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent optimizes the geometric parameters of the pixel electrode (angles of 135 degrees or more) to achieve improved image quality without requiring complex additional structures, thereby reducing manufacturing complexity while maintaining reliability.
3Adaptability or versatility
If various pixel electrode structures are implemented to resolve limited viewing angle, then viewing angle improves, but transmission rate decreases
Solution Approach 1:
The patent implements specific geometric parameter changes (interior angles of 135 degrees or more) in the pixel electrode structure that simultaneously achieve improved viewing angle and maintained transmission rate, resolving the productivity concern.
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 design enhances display quality by maintaining or improving transmission rates while reducing image distortion across various viewing angles, thereby addressing the limitations of traditional liquid crystal display devices.
Implementation Method 1
When an electric field is applied to the liquid crystal, a fringe field is generated at an edge area of a patterned electrode where liquid crystal molecules are aligned in a plurality of directions.
Implementation Method 2
an image realized by a liquid crystal display device has a limited viewing angle depending on the angle from which the image is viewed due to anisotropy characteristics of liquid crystal
Data Source
AI summary
A display device includes a first substrate comprising a pixel area a first pixel electrode on the pixel area and a second pixel electrode overlapping the first pixel electrode; a second substrate including a common electrode and facing the first substrate; and a liquid crystal layer between the first substrate and the second substrate. The first pixel electrode includes first and second sides parallel to a side of the pixel area; third and fourth sides respectively extending from first ends of the first and second sides, inclined with respect to the first and second sides and parallel to each other; and fifth and sixth sides parallel to each other, and connecting the second and first sides with the third and fourth sides, respectively. An acute angle between each of the third to sixth sides, with respect to the first and second sides, exceeds about 135 degrees.