Textured Planarization Layer Grooves for Liquid Crystal Distribution
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Solution Overview
Problem
Liquid crystal display panels experience uneven brightness and the gravitational Mura phenomenon when placed vertically, due to the uneven distribution of liquid crystal caused by gravity and temperature expansion.
Innovation Solution
A display panel with a textured structure on the planarization layer, featuring groove paths that allow liquid crystal material to diffuse and climb upward through capillary action, reducing the influence of gravity and promoting even distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the liquid crystal display panel is placed vertically under high temperature, then the liquid crystal cell expands and cell thickness increases, but the liquid crystal distributes unevenly due to gravity causing gravitational Mura
Solution Approach 1:
The planarization layer is segmented into multiple groove paths with specific geometric configurations. These grooves divide the liquid crystal distribution into multiple channels, allowing gravity to act uniformly across different segments while maintaining overall even distribution throughout the cell.
Solution Approach 2:
The groove paths are strategically positioned in specific regions of the planarization layer, particularly in areas where liquid crystal accumulation is most likely to occur under gravity. This localized modification creates capillary action zones that prevent gravitational Mura without affecting the entire cell structure.
2Stability of the object's composition
If groove paths are added to the planarization layer, then liquid crystal distribution becomes more uniform through capillary action, but the device complexity increases
Solution Approach 1:
The groove paths are designed with specific geometric parameters including width, depth, and spacing that are optimized to generate sufficient capillary action. By carefully controlling these parameters, the structure achieves effective liquid crystal distribution while minimizing the increase in device complexity.
Solution Approach 2:
The groove paths utilize the inherent capillary action of the liquid crystal material itself to achieve even distribution. The liquid crystal's own surface tension and viscosity properties are harnessed to fill the grooves and distribute uniformly, eliminating the need for external pumping or complex control mechanisms.
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 solution effectively reduces the gravitational Mura phenomenon by ensuring even liquid crystal distribution, leading to more uniform display and improved display quality.
Implementation Method 1
The liquid crystal material in the liquid crystal layer diffuses along the extending direction of the groove paths through the groove paths based on a capillary phenomenon
Data Source
AI summary
A display panel and a display device are disclosed. The display panel includes a first substrate, a second substrate, and a liquid crystal layer disposed therebetween. The first substrate includes a first base and a planarization layer disposed on a side of the first substrate adjacent to the liquid crystal layer. A side of the planarization layer adjacent to the liquid crystal layer includes a textured structure, which includes at least one groove path. The first substrate further includes a bottom edge. An extending direction of the at least one groove path forms an included angle with the bottom edge, the included angle being greater than or equal to 45 degrees and less than or equal to 135 degrees. A liquid crystal material in the liquid crystal layer diffuses along the extending direction of the groove path through the groove path based on capillary phenomenon.