Retaining Walls Between Spacers Prevent Gravity Mura in LCD Panels
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Solution Overview
Problem
Current liquid crystal display panels experience issues with liquid crystal material accumulating at the bottom due to gravity, leading to uneven brightness, darkness, and gravity mura, especially under high temperature conditions where the cell gap expands.
Innovation Solution
Incorporating retaining walls between spacers in the non-display area of the liquid crystal display panel to prevent liquid crystal material from flowing to the bottom, maintaining cell gap uniformity and improving brightness uniformity without affecting light transmission or requiring additional processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If liquid crystal display panel is placed vertically under high temperature environment, then cell gap expands due to thermal expansion, but liquid crystal material accumulates at bottom due to gravity causing uneven brightness and gravity mura
Solution Approach 1:
The spacer structure is segmented into multiple components: first spacers disposed in the non-display area, second spacers disposed between the first spacers and the display area, and retaining walls disposed between the spacers. This segmentation creates distinct functional zones that work together to prevent liquid crystal accumulation while maintaining cell gap uniformity under thermal expansion conditions.
Solution Approach 2:
The retaining walls act as intermediary structures between the first spacers and second spacers. These retaining walls specifically block the downward flow of liquid crystal material caused by gravity, serving as a mediator that prevents the harmful accumulation effect while allowing the spacer structure to maintain its cell gap function.
2Length of stationary object
If spacers are added to maintain cell gap, then substrate separation is prevented, but liquid crystal material can still flow to bottom due to gravity
Solution Approach 1:
The spacer system is divided into first spacers for maintaining cell gap and second spacers positioned closer to the display area, with retaining walls interspersed between them. This segmentation allows the structure to simultaneously perform cell gap maintenance and liquid crystal flow blocking functions.
Solution Approach 2:
The retaining walls serve as intermediary elements embedded within the spacer structure. These retaining walls specifically address the gravity-induced liquid crystal accumulation problem by creating physical barriers that block downward flow, while the overall spacer structure continues to maintain the required cell gap.
3Manufacturing precision
If retaining walls are added to block liquid crystal flow, then brightness uniformity improves, but device structure becomes more complex
Solution Approach 1:
The retaining walls are merged with the spacer structure, forming an integrated component system. The retaining walls are disposed between the first spacers and second spacers, combining the cell gap maintenance function of spacers with the liquid crystal blocking function of retaining walls into a unified structure that reduces overall device complexity.
Solution Approach 2:
The combined spacer-retaining wall structure performs multiple functions simultaneously: maintaining cell gap (spacer function), blocking liquid crystal accumulation (retaining wall function), and preventing substrate contact (spacer function). This multi-functionality reduces the need for separate components, thereby reducing device 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
The retaining walls effectively block liquid crystal material from accumulating at the bottom, enhancing cell gap uniformity and display performance by preventing gravity-induced mura, thus improving the overall display quality.
Implementation Method 1
liquid crystal material will accumulate on a bottom of the liquid crystal panel due to gravity
Implementation Method 2
a volume of the liquid crystal will expand at high temperature, which will cause the cell gap of the panel to become larger
Data Source
AI summary
A liquid crystal display panel and a liquid crystal display device are provided. The liquid crystal display panel includes a substrate comprising a first substrate and a second substrate, a plurality of spacers comprising a plurality of first spacers and a plurality of second spacers, and at least one retaining wall disposed between the first spacer and the second spacer or between the second spacers.