Liquid Crystal Display Panel Void in Organic Insulating Film
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Solution Overview
Problem
Conventional liquid crystal display panels with organic insulating films face issues such as gas permeation leading to bubble formation in the liquid crystal layer, causing display defects, which existing techniques fail to adequately address.
Innovation Solution
Incorporating voids in the organic insulating film at positions overlapping the pixel electrode ends to accumulate and trap gases before they permeate into the liquid crystal layer, reducing gas migration and bubble formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gas barrier layer is placed on the organic insulating film to prevent gas movement, then gas permeation is reduced, but the generated gas creates pressure that may cause cracks in the gas barrier layer, impairing reliability
Solution Approach 1:
The patent introduces a new component (void) as an intermediary structure between the organic insulating film and the gas barrier layer. This void acts as a mediator that receives and accommodates the generated gas, preventing direct pressure transmission to the gas barrier layer while maintaining the layer's integrity and preventing display defects
Solution Approach 2:
The patent utilizes a void (porous structure) within the organic insulating film to provide a space for gas accumulation. This porous approach allows the gas to be contained in a specific region rather than being forced against the gas barrier layer, thereby reducing pressure-related damage
2Area of stationary object
If the organic insulating film has high moisture absorbency to increase aperture ratio, then pixel electrode and thin-film transistor element can overlap, but gas such as water vapor is generated that permeates into the liquid crystal layer and emerges as bubbles
Solution Approach 1:
The patent converts the harmful effect of gas generation into a beneficial outcome by designing a void structure that deliberately captures and contains the gas. Instead of allowing gas to permeate and cause bubbles, the void serves as a designated accommodation space, transforming a potential defect source into a controlled feature
Solution Approach 2:
The patent extracts the gas from the problematic path (permeation route to liquid crystal layer) by providing a separate containment space (void) within the organic insulating film. This separation removes the harmful gas from the system's critical path, preventing bubble formation while maintaining the overlapping structure for high aperture ratio
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 approach effectively minimizes display defects by containing gases within the voids, enhancing the reliability and performance of liquid crystal display panels.
Implementation Method 1
the organic insulating film is provided with a void at a position overlapping an end of the pixel electrode... allows the gas generated from the organic insulating film to accumulate in the void before permeation into the liquid crystal layer
Implementation Method 2
when the driving thereof leads to a temperature rise, high moisture absorbency of the organic insulating film causes generation of gas such as water vapor
Implementation Method 3
when a production process of a liquid crystal display panel includes light application (e.g., a photo-alignment treatment on an alignment film), this light application may cause reactions such as reactions of unreacted components in the organic insulating film and photolysis reactions of components of the organic insulating film
Implementation Method 4
a conventionally examined technique is to place on an organic insulating film a gas barrier layer that prevents movement of the gas generated from the organic insulating film
Data Source
AI summary
The present invention provides a liquid crystal display panel capable of reducing display defects due to bubbles. The liquid crystal display panel of the present invention includes, sequentially from a back side to a viewing side, a first substrate, a liquid crystal layer, and a second substrate. The first substrate includes, sequentially from a liquid crystal layer side, a pixel electrode and an organic insulating film in contact with the pixel electrode. The organic insulating film is provided with a void at a position overlapping an end of the pixel electrode. Preferably, the second substrate includes a black matrix and the void overlaps the black matrix.