Liquid Crystal Display Seal Width Control via Variable Dispensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional liquid crystal display device manufacturing methods using dispensers often result in unnecessary sealing material portions and increased seal widths at cutting lines, leading to potential defects during substrate cutting.
Innovation Solution
The method involves forming a liquid crystal display device with a sealing material that includes a ring portion and extension portions, where the dispenser passes over the extension portions with a reduced seal discharge amount per unit length, ensuring the seal width of the extension portions is between 0.8 and 1.2 times the seal width of the ring portion, and the substrates are cut along the extension portions, maintaining a balanced seal width ratio to minimize defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the dispenser moves along a track to form sealing material without stopping discharge, then continuous sealing material is formed, but the seal width becomes inconsistent and unnecessary portions are created
Solution Approach 1:
The patent applies dynamics by making the seal discharge amount variable rather than constant. The control unit dynamically adjusts the discharge amount based on the dispenser's position: using a first discharge amount when forming the ring portion and a second discharge amount (smaller than the first) when forming extension portions. This dynamic adjustment resolves the contradiction by maintaining continuous formation while ensuring consistent seal width.
Solution Approach 2:
The patent changes the parameter of discharge amount based on position. By switching between a first discharge amount (for ring portion) and a second discharge amount (for extension portions), the system achieves both continuous formation and consistent seal width, resolving the technical contradiction between productivity and manufacturing precision.
2Manufacturing precision
If the dispenser passes over the same position twice to ensure complete coverage, then coating completeness is improved, but the seal width increases excessively
Solution Approach 1:
The patent applies local quality by making the discharge amount location-dependent. When the dispenser passes over extension portions (local area), a reduced second discharge amount is used, preventing excessive seal width accumulation. When forming the ring portion (different local area), the full first discharge amount is used. This local differentiation resolves the contradiction between coating completeness and seal width control.
Solution Approach 2:
The patent changes the discharge parameter based on the local region being coated. By switching between first discharge amount (ring portion) and second discharge amount (extension portions), the system achieves complete coating coverage while controlling seal width within acceptable ranges, resolving the contradiction between manufacturing precision and dimension control.
3Strength
If the seal width at cutting line is increased to ensure substrate sticking, then bonding strength is improved, but cutting defects are generated
Solution Approach 1:
The patent optimizes the seal width parameter by using a reduced second discharge amount for extension portions, controlling the seal width to fall within a specific range (0.8 to 1.2 times the ring portion width). This parameter optimization ensures adequate bonding strength while preventing cutting defects, resolving the contradiction between strength and manufacturing precision.
Data Source
AI summary
To provide a liquid crystal display device in which a seal width at a cutting portion of substrates is small and defects caused at the time of cutting the substrates can be reduced. There is provided a liquid crystal display device including a liquid crystal display panel having: a first substrate; a second substrate; a sealing material through which the first substrate and the second substrate are stuck together; and a liquid crystal enclosed inside a liquid crystal enclosure area encircled by the first substrate, the second substrate, and the sealing material, wherein the sealing material includes a ring portion in a ring shape which configures the liquid crystal enclosure area and whose whole circumference is closed, and a first extension portion and a second extension portion, each of which is integrally connected to the ring portion and is arranged outside the ring portion, the first extension portion extends up to a cut-end portion of a first side of the liquid crystal display panel, the second extension portion extends up to a cut-end portion of a second side of the liquid crystal display panel, the second side being opposed to the first side, and in a state where the first substrate and the second substrate are stuck together, W2≦W1≦1.2W2 is satisfied where W1represents a seal width of the first extension portion and a seal width of the second extension portion, and W2 represents a seal width of the ring portion.