LCD Edge Failure Prevention via Localized Column Spacer Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional liquid crystal displays (LCDs) face edge failures due to excessive liquid crystal dispensing, leading to uneven liquid crystal layer thickness and reduced manufacturing yield, as excess liquid crystal accumulates at the edges of the panel, increasing the cell gap and affecting light transmission.
Innovation Solution
The LCD design includes a second substrate with color filters formed over a plurality of pixel regions in a first area and separately at each pixel region in a second area, creating a liquid crystal margin that prevents the thickness of the liquid crystal layer from increasing at the edges even when excessive liquid crystal is dispensed, by forming column spacers with a predetermined height difference between the first and second areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If excessive liquid crystal is dispensed into the liquid crystal panel, then the liquid crystal layer may be sufficiently filled, but the cell gap increases at edge portions resulting in uneven thickness
Solution Approach 1:
The invention applies different structures to different regions of the liquid crystal panel. Specifically, the first column spacers are formed to extend beyond the black matrix region into the display region, while the second column spacers are formed only within the black matrix region. This local differentiation allows the first column spacers to prevent edge failure and maintain uniform cell gap at panel edges, while the second column spacers provide additional spacing control in the black matrix area, thereby resolving the contradiction between sufficient liquid crystal filling and uniform thickness control.
2Quantity of substance
If the cell gap increases at edge portions due to excess liquid crystal, then light transmission may be affected, but the overall liquid crystal filling is improved
Solution Approach 1:
The invention implements region-specific column spacer configurations where the first column spacers extend into the display region at panel edges to maintain uniform cell gap and ensure consistent light transmission in the display area. The second column spacers are confined to the black matrix region to provide additional spacing control without interfering with the display region. This local differentiation prevents edge failure that would otherwise cause non-uniform light transmission, while still allowing sufficient liquid crystal filling throughout the panel.
3Ease of manufacture
If column spacers are formed uniformly across the entire substrate, then manufacturing is simplified, but edge portions cannot be protected from excessive liquid crystal
Solution Approach 1:
The invention differentiates column spacer configuration by region: first column spacers are formed to extend beyond the black matrix into the display region at panel edges, while second column spacers are formed only within the black matrix region. This can be achieved through selective masking or patterning processes during fabrication. The differentiated structure provides enhanced edge protection without requiring complete redesign of the manufacturing process, thus maintaining reasonable manufacturing simplicity while significantly improving edge portion reliability and preventing edge failure.
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 design ensures uniform liquid crystal layer thickness across the LCD, enhancing light transmission and manufacturing yield by maintaining a consistent cell gap and preventing edge failures.
Implementation Method 1
the common electrode on the insulating substrate provided on a second substrate changing the orientation of molecules in a liquid crystal layer by a potential difference from a pixel electrode provided on a first substrate
Implementation Method 2
a sealant is applied to the edge of the first substrate, a liquid crystal material is dispensed into an edge portion, and the first and second substrates are aligned to then be combined
Data Source
AI summary
A liquid crystal display is provided. The liquid crystal display includes a first substrate and a second substrate facing and spaced apart from each other in a predetermined distance, in which the second substrate has a first area in which color filters are formed over a plurality of pixel regions and a second area in which the color filters are formed at each of the plurality of pixel regions.