Liquid Crystal Supply Portion and Spacer Structure for Bubble-Free Enclosure
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Solution Overview
Problem
The method of enclosing liquid crystal between substrates can generate a large number of fine bubbles if a member obstructs the flow, affecting the display performance of the display device.
Innovation Solution
The display device includes a liquid crystal supply portion along the first side of the peripheral region, with the insulating film removed in the peripheral region between the display region and the sealing portion, and additional spacer members to maintain the gap between the substrates, ensuring unobstructed liquid crystal flow and reducing bubble generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If liquid crystal is supplied through an opening in the sealing portion by pressure difference, then liquid crystal can be enclosed between substrates, but fine bubbles are generated in the liquid crystal affecting display performance
Solution Approach 1:
The insulating film is selectively removed in the first peripheral region to extract the obstruction element that causes bubble generation. This creates a clear flow path for liquid crystal from the supply portion through the display region, preventing bubble formation while maintaining the film's insulating function in other regions.
Solution Approach 2:
The insulating film is removed in advance in the first peripheral region before liquid crystal supply. This preliminary action ensures that when liquid crystal is supplied through the opening, it encounters no obstructions and flows smoothly into the display region without generating bubbles.
2Object-affected harmful factors
If insulating film is removed in the first peripheral region, then liquid crystal flow is unobstructed, but additional spacer members are required to maintain gap
Solution Approach 1:
Different spacer member structures are used in different regions: second spacer members are placed in the first peripheral region where the insulating film is removed, while third spacer members support the second spacer members locally. This localized structural adaptation maintains the gap only where needed without adding complexity to the entire device.
3Object-affected harmful factors
If liquid crystal supply portion is provided along the first side of peripheral region, then injection path is widened, but sealing structure becomes more complex
Solution Approach 1:
The sealing portion serves multiple functions: it seals the liquid crystal layer, provides the liquid crystal supply opening, and defines the peripheral region boundaries. By integrating the supply opening into the sealing portion along the first side, the structure achieves widened injection path without adding separate sealing and supply components.
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 suppresses the generation of bubbles and maintains the gap between the substrates, improving the display performance by ensuring a wider injection path for the liquid crystal and maintaining similar light transmission characteristics in both the display and peripheral regions.
Implementation Method 1
By bringing the liquid crystal into contact with the opening in a vacuum atmosphere and then returning the pressure around the substrates to an ordinary pressure, the liquid crystal is enclosed into the space surrounded by the sealing portion by the pressure difference between the pressure inside the space surrounded by the sealing portion and the atmospheric pressure.
Data Source
AI summary
A display device includes a display region, a peripheral region around the display region, a sealing portion provided in the peripheral region to seal the liquid crystal layer, and a liquid crystal supply portion provided at a part of the sealing portion and interconnecting an outside of the sealing portion and the display region. The liquid crystal supply portion is provided along one side of the peripheral region. The peripheral region includes a first peripheral region located between the display region and the sealing portion. An insulating film is removed in the first peripheral region. In the first peripheral region, a plurality of second spacer members and a plurality of third spacer members to support the plurality of second spacer members are provided.