Varying Height Alignment Protrusions for LCD Color Uniformity
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Solution Overview
Problem
Conventional multi-domain vertical alignment (MVA) liquid crystal display (LCD) panels experience brightness imbalance and gamma shift due to stationary alignment protrusion structures, leading to abnormal display performance, especially when viewed from different angles.
Innovation Solution
The implementation of alignment protrusion structures with varying heights in different pixel regions, formed from color filtering materials or transparent photo-sensitive materials, to adjust the tilt angles of liquid crystal molecules and achieve uniform brightness across red, green, and blue sub-pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If alignment protrusion structures with stationary height are used in conventional MVA LCD panels, then the manufacturing process is simple, but brightness imbalance and gamma shift occur due to uniform liquid crystal tilting angles across all sub-pixels
Solution Approach 1:
The patent applies local quality by creating alignment protrusion structures with different heights specifically in different sub-pixel regions (red, green, blue). Each sub-pixel region has alignment protrusions tailored to its specific color characteristics, allowing localized control of liquid crystal tilting angles to compensate for wavelength-dependent transmittance differences and achieve uniform brightness across all colors.
Solution Approach 2:
The patent changes the height parameter of alignment protrusion structures to optimize display performance. By varying the height of alignment protrusions in different sub-pixel regions, the patent adjusts the tilting angles of liquid crystal molecules to compensate for the different transmittances of various wavelengths, thereby resolving brightness imbalance and gamma shift issues.
2Manufacturing precision
If alignment protrusion structures with varying heights are implemented in different pixel regions, then color uniformity and display performance are improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent segments the alignment protrusion structures into different height levels corresponding to different sub-pixel regions. By dividing the display panel into red, green, and blue sub-pixel regions and providing customized alignment protrusions for each, the patent achieves precise control over liquid crystal orientation in each color region while maintaining a systematic manufacturing approach.
Solution Approach 2:
The patent introduces height as an additional dimensional parameter for alignment protrusion structures. Instead of using uniform two-dimensional patterns, the patent utilizes vertical dimension variation (different heights) to create multi-domain vertical alignment effects that improve color uniformity and reduce gamma shift, thereby solving complexity through dimensional enrichment rather than complicating the base structure.
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 enhances color uniformity and reduces gamma shift by ensuring appropriate wavelength-brightness distribution for each color, resulting in improved display performance across different viewing angles.
Implementation Method 1
The alignment protrusion structure 112 modifies the direction of electric field nearby, and causes liquid crystal molecules in the liquid crystal layer 130 arranged in multi-domain
Implementation Method 2
the liquid crystal molecules tilting by an effect of the alignment protrusion structure 112 have different transmittances to the lights with different wavelengths
Data Source
AI summary
A liquid crystal display panel comprising a first substrate, a second substrate, and a liquid crystal layer is provided. A plurality of first pixel regions, second pixel regions and third pixel regions are defined on the second substrate. A first alignment protrusion structure is disposed in the first pixel regions, a second alignment protrusion structure is disposed in the second pixel regions, and a third alignment protrusion structure is disposed in the third pixel regions. Wherein, the heights of the first, second and third alignment protrusion structures are different. The liquid crystal layer is disposed between the first substrate and the second substrate.