VA Display Pixel Electrodes with Distinct Fine Slit Angles
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Solution Overview
Problem
In vertical alignment (VA) mode liquid crystal displays, achieving optimal transmittance for one pixel color often results in decreased transmittance for other color pixels due to the fine slit angle settings.
Innovation Solution
The display device incorporates red, green, and blue pixel electrodes with distinct angles between their transverse stem and fine branch portions, optimizing the angle differences to enhance transmittance for each pixel color.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the fine slit angle is set according to optimum transmittance of one pixel among red, green, and blue pixels, then the transmittance of that pixel is improved, but the transmittance of the other color pixels decreases
Solution Approach 1:
The patent applies local quality by assigning different fine slit angles to different color pixels. Specifically, red pixels have a first fine slit angle, green pixels have a second fine slit angle, and blue pixels have a third fine slit angle. This allows each color to be optimized independently for its transmittance characteristics while maintaining overall color balance across the display.
Solution Approach 2:
The patent implements asymmetry by deliberately using non-uniform fine slit angles across different color pixels. Instead of applying the same angle to all pixels, the design employs asymmetric angle distribution where red, green, and blue pixels have distinct angles tailored to their respective optical properties and transmittance requirements.
2Adaptability or versatility
If multiple domains with different liquid crystal molecule alignment directions are formed in one pixel, then the viewing angle is widened, but the transmittance optimization becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing each pixel into multiple domains with different liquid crystal molecule alignment directions. These domains are created through cutouts or protrusions in the field generating electrode, allowing independent control of alignment in different regions to achieve wide viewing angle characteristics.
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 approach increases the transmittance of each pixel by differentiating the fine slit angles, ensuring improved luminance ratios and overall display performance.
Implementation Method 1
The liquid crystal display may generate an electric field in a liquid crystal layer by applying voltages to the field generating electrodes
Implementation Method 2
control polarization of incident light, thus displaying an image
Implementation Method 3
determine orientations of liquid crystal molecules of the liquid crystal layer
Data Source
AI summary
A display device includes a substrate; and a red pixel electrode, a green pixel electrode, and a blue pixel electrode disposed on the substrate. Each of the red pixel electrode, the green pixel electrode, and the blue pixel electrode includes a transverse stem portion, a longitudinal stem portion, and a fine branch portion. An angle between the transverse stem portion and the fine branch portion of the red pixel electrode, an angle between the transverse stem portion and the fine branch portion of the green pixel electrode, and an angle between the transverse stem portion and the fine branch portion of the blue pixel electrode are different from each other.