Liquid Crystal Display Peripheral Spacer Configuration
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Solution Overview
Problem
Conventional liquid crystal display devices using the one drop fill method experience uneven cell gaps between the display region and the peripheral region due to non-uniform spacer support and variations in liquid crystal injection, leading to display irregularities and potential bubble formation.
Innovation Solution
The liquid crystal display device features a peripheral region with a gradually widened clearance between substrates, allowing a gentle transition in cell gap from the display region to the peripheral region, and includes a liquid crystal excess region to absorb excess liquid crystal, thereby tolerating uneven liquid crystal injection and preventing sudden cell gap changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform height spacers are used in both display region and peripheral region, then spacer manufacturing is simplified, but cell gap uniformity deteriorates due to different lamination structures
Solution Approach 1:
The patent applies different spacer heights to different regions: the display region uses spacers with a first height to achieve a first cell gap, while the peripheral region uses spacers with a second height (different from the first) to achieve a second cell gap. This local differentiation resolves the contradiction by optimizing each region's cell gap according to its specific lamination structure requirements, thereby improving overall cell gap uniformity while maintaining manufacturing feasibility.
2Productivity
If the one drop fill method is used to inject liquid crystal, then injection speed and material utilization are improved, but cell gap uniformity deteriorates due to pressure distribution issues
Solution Approach 1:
The patent compensates for the pressure distribution issues inherent in the one drop fill method by implementing region-specific spacer heights. The display region and peripheral region use different spacer heights to counterbalance the non-uniform pressure applied during one drop fill injection, thereby maintaining cell gap uniformity while benefiting from the high productivity of the one drop fill method.
3Manufacturing precision
If spacers have different heights in display region and peripheral region, then cell gap uniformity is improved, but device complexity increases
Solution Approach 1:
The patent implements a practical local quality solution by dividing the substrate into display region and peripheral region, each with appropriately differentiated spacer heights. This approach achieves the necessary cell gap uniformity while controlling device complexity through a clear regional division and straightforward spacer height differentiation that aligns with the existing lamination structure variations.
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 prevents display unevenness by maintaining a uniform cell gap and tolerating variations in liquid crystal injection, reducing the risk of bubble formation and improving the structural integrity of the display device.
Implementation Method 1
an atmospheric pressure is recovered so that the adhesive is crushed by a difference in pressure between the inside and the outside of the region surrounded by the two substrates and an inner wall of the adhesive
Implementation Method 2
a given amount of liquid crystal is dropped into a region surrounded by an adhesive disposed on one of the substrates and the two substrates are assembled together in a vacuum state. Thereafter, an atmospheric pressure is recovered so that the adhesive is crushed
Data Source
AI summary
Structural objects are disposed in a peripheral region in positions opposed to spacers. In this way, a substrate surface of a counter substrate in the peripheral region is gently inclined in a direction away from a liquid crystal layer. In this way, it is possible to prevent unevenness in display attributable to a difference in a cell gap between a display region and the peripheral region.