LCD Pixel Electrode Slits for Polarized Sunglasses
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Solution Overview
Problem
Existing liquid crystal display devices face challenges in maintaining a high aperture ratio while accommodating polarized sunglasses, as simply altering the rubbing direction and polarizing element orientation leads to significant brightness loss without using a phase difference plate.
Innovation Solution
A liquid crystal display device design featuring a pixel electrode with subpixels divided into first and second regions, each with slit-shaped openings inclined relative to the rubbing direction, and signal lines routed to minimize adverse effects on aperture ratio, allowing for reduced brightness loss when viewed through polarized sunglasses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the rubbing direction is set to be other than parallel or orthogonal to pixel arrangement direction and polarizing element transmission axis is oriented in the same direction as rubbing direction, then brightness loss for viewers wearing polarized sunglasses is reduced, but aperture ratio decreases significantly
Solution Approach 1:
The pixel electrode is divided into multiple regions with different rubbing directions. Specifically, a first region has a first rubbing direction and a second region has a second rubbing direction that is different from the first rubbing direction. This segmentation allows different parts of the pixel to have optimized light transmission characteristics for viewing through polarized sunglasses while maintaining overall aperture ratio.
Solution Approach 2:
Different regions within the pixel electrode are assigned different local properties (rubbing directions) to optimize performance. The first region and second region have distinct rubbing directions tailored to their specific functions, allowing the display to maintain high brightness for polarized sunglasses viewers without sacrificing overall aperture ratio.
2Illumination intensity
If a phase difference plate is added to change linear polarization into circular polarization for polarized sunglasses compatibility, then brightness loss is reduced, but module thickness increases and cost rises
Solution Approach 1:
The patent extracts and eliminates the phase difference plate from the display structure by using alternative rubbing direction configurations in the orientation films. This removes the need for additional optical compensation layers, thereby reducing module thickness and manufacturing cost while still achieving compatibility with polarized sunglasses.
Solution Approach 2:
The invention replaces expensive additional optical components (phase difference plate) with a simpler, more cost-effective solution involving modified rubbing directions in existing orientation films. This substitution reduces both material cost and manufacturing complexity.
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 design effectively reduces aperture ratio loss and maintains image clarity when viewed through polarized sunglasses without the need for a phase difference plate, enhancing the viewing experience in portable electronic equipment.
Implementation Method 1
a liquid crystal layer sandwiched therebetween
Implementation Method 2
an orientation film, pixel electrode, insulating layer and common electrode in this order from the side of the liquid crystal layer, the orientation film being rubbed in a rubbing direction
Data Source
AI summary
A liquid crystal display device includes: a plurality of scan lines and signal lines on one of a pair of substrates arranged to be opposed to each other with a liquid crystal layer sandwiched therebetween, the scan lines and signal lines extending in different directions; and an orientation film, pixel electrode, insulating layer and common electrode, the orientation film being rubbed in a rubbing direction having a given inclination with respect to a pixel arrangement direction. The pixel electrode is partitioned by the scan lines and signal lines and has subpixels made up of first and second regions. The first region has a plurality of slit-shaped openings having a given inclination in a first direction with respect to the rubbing direction. The second region has a plurality of slit-shaped openings having a given inclination in a second direction with respect to the rubbing direction.