Curved LCD Spacer Density for Display Uniformity
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Solution Overview
Problem
Curved liquid crystal display devices face challenges in maintaining display quality due to display unevenness caused by gap and stress issues, particularly at high and low temperatures, which are not effectively addressed by existing spacer structures.
Innovation Solution
A dual spacer structure with main and sub spacers, where the density and height of main spacers are adjusted to maintain the interval between glass substrates, with a higher density and height at the center portion than at the end portions, allowing for effective suppression of bulging and foaming failures and display unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dual spacer structure with main and sub spacers is used to suppress failures due to temperature range expansion, then robustness against temperature-related failures is improved, but the compression deformation amount of main spacers becomes difficult to control due to complicated stress behavior in curved liquid crystal display devices
Solution Approach 1:
The patent applies local quality by making the main spacers have different heights in different regions of the liquid crystal panel. Specifically, the main spacers are designed with a first height in a first region and a second height (different from the first height) in a second region. This regional differentiation allows the spacers to locally adapt to the complicated stress distribution in curved display devices, enabling controlled compression deformation in each region while maintaining the dual spacer structure's temperature robustness.
2Manufacturing precision
If the density of main spacers is increased to control compression deformation, then display unevenness is reduced, but the device complexity increases due to the need to appropriately select area density and ratio between main and sub spacers
Solution Approach 1:
The patent implements local quality through non-uniform distribution of main spacers across different regions. The area density of main spacers is appropriately selected to differ between the first region and the second region, allowing each region to have optimized spacer density for its specific stress conditions. This regional optimization achieves uniform display quality while managing the complexity of spacer arrangement through systematic regional classification.
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 configuration allows for improved robustness against temperature-related failures and display unevenness, maintaining display quality across a wide temperature range by optimizing the compression deformation of spacers and reducing stress-induced issues.
Implementation Method 1
when the main spacer elastically deforms and the interval between a pair of glass substrates becomes closer
Data Source
AI summary
A liquid crystal display device is a curved liquid crystal display device including a liquid crystal panel which includes a liquid crystal, glass substrates which sandwich the liquid crystal, main spacers, and sub spacers. The main spacers come into contact with both of the glass substrates and keep an interval between the glass substrates. The sub spacers are arranged to come into contact with only one of the glass substrates, and, when the main spacers elastically deform and the interval between the glass substrates becomes close, come into contact with both of the glass substrates and keep the interval. The density of the main spacers per unit area in the display region is higher at a center portion than at both end portions in a curving direction of the liquid crystal panel.