Liquid Crystal Supply Structure for Bubble-Free Display Sealing
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Solution Overview
Problem
The method of enclosing liquid crystal between substrates using a sealing portion can generate fine bubbles due to obstructions in the supply passage, affecting the display performance of the display device, and widening the cross-sectional area of the supply passage to suppress bubble generation leads to a visually recognizable boundary.
Innovation Solution
A display device configuration with a peripheral region around the display region, where the insulating film is removed near the liquid crystal supply portion, and spacer members maintain the gap between substrates, along with a light blocking film to minimize the visibility of the boundary between regions, ensuring unobstructed liquid crystal flow and consistent light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cross-sectional area of the supply passage is widened to suppress bubble generation, then bubble generation is suppressed, but the boundary between the widened region and other regions becomes visually recognizable
Solution Approach 1:
The patent applies local quality by creating a widened supply passage region only in the peripheral area where liquid crystal is supplied, while maintaining the original passage width in the display region. This localized widening suppresses bubble generation at the critical supply interface without creating a visible boundary across the entire display area, as the boundary effect is confined to the peripheral region where it does not interfere with the display quality.
2Productivity
If the insulating film is removed from the peripheral region to widen the supply passage, then liquid crystal flow is improved, but the boundary between regions becomes more conspicuous
Solution Approach 1:
The insulating film is selectively removed only from the peripheral region where the supply passage is widened, while maintaining the insulating film in the display region. This localized modification allows unobstructed liquid crystal flow at the supply interface without creating a visible boundary effect across the display area, as the insulating film remains in place in the display region where it would otherwise be visible.
Solution Approach 2:
The patent introduces a light blocking film as an intermediary element that masks the boundary between the peripheral region (where insulating film is removed) and the display region (where insulating film remains). This light blocking film acts as a mediator to hide the visual boundary created by the differential insulating film configuration, allowing the supply passage widening to function without creating a conspicuous visual boundary.
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 effectively suppresses bubble generation and maintains the gap between substrates, enhancing the display performance by ensuring consistent light transmission and minimizing the visibility of boundaries, thus improving the overall display quality.
Implementation Method 1
A first light blocking film arranged so as to straddle the first peripheral region and the second peripheral region and extending linearly along an extending direction of a boundary between the first peripheral region and the second peripheral region is formed on the second substrate
Implementation Method 2
a liquid crystal layer arranged between the first substrate and the second substrate and containing liquid crystal
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 a 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 peripheral region includes a first peripheral region which is provided between the display region and the sealing portion and from which an insulating film is removed and a second peripheral region which is provided between the display region and the sealing portion and in which the insulating film covering a circuit is formed. A light blocking film arranged so as to straddle the first and second peripheral regions and extending linearly in an extending direction of a boundary between the first and second peripheral regions is formed on a substrate.