Light Path Control Member Sealing Structure for Display Devices
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Solution Overview
Problem
Switchable light blocking films used in display devices face issues such as dispersion liquid leakage, impurity penetration, and moire phenomena due to pattern overlap, which degrade visibility and reliability.
Innovation Solution
A light path control member with a structure that includes a first and second substrate, electrodes, and a light conversion part with partition wall and receiving portions, sealed by sealing portions to prevent leakage and impurity ingress, and tilted receiving portions to prevent moire phenomena.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a switchable light blocking film uses a viscous dispersion liquid to fill the receiving portions, then the light path control function is achieved, but the dispersion liquid flows out to the outside and impurities penetrate in, degrading reliability
Solution Approach 1:
The receiving portions are divided into multiple sealed compartments by partition walls. Each compartment is independently sealed, preventing the dispersion liquid from flowing out while maintaining the light blocking function. This segmentation approach solves the leakage problem by creating isolated chambers that contain the liquid material.
Solution Approach 2:
A sealing portion is introduced as an intermediary element between the receiving portions and the external environment. This sealing layer acts as a barrier that prevents both dispersion liquid leakage and impurity penetration, while allowing the light blocking film to maintain its switchable functionality.
2Reliability
If the switchable light blocking film uses a patterned structure, then the light path control function is achieved, but the pattern overlaps with the display panel pattern to cause moire phenomenon, degrading visibility
Solution Approach 1:
The patterned structure of the switchable light blocking film is removed or extracted. Instead of using a patterned design that overlaps with the display panel, the film uses a uniform structure with partition walls that define receiving portions. This eliminates the moire phenomenon caused by pattern interference while maintaining the light blocking functionality through the receiving portions filled with dispersion liquid.
3Reliability
If the light path control member uses a sealed structure with partition walls, then liquid leakage and impurity penetration are prevented, but the device complexity increases
Solution Approach 1:
The sealing structure is applied locally only where needed - at the boundaries of receiving portions and at the inlet/outlet regions. Partition walls are formed only to separate adjacent receiving portions, not throughout the entire structure. This localized approach provides the necessary sealing and containment functionality while minimizing the increase in device complexity.
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
Enhances visibility and reliability by preventing liquid leakage and impurity penetration, and reduces bezel size while improving electrical connection and filling efficiency.
Implementation Method 1
a light conversion material including a dispersion and a plurality of light conversion particles dispersed in the dispersion is disposed in the receiving portion
Implementation Method 2
by dispersing and aggregating the particles
Implementation Method 3
a light conversion material including electrophoretic particles that move when a voltage is applied and a dispersion liquid for dispersing the electrophoretic particles
Data Source
AI summary
A light path control member according to an embodiment comprises: a first substrate; a first electrode disposed on the first substrate; a second substrate disposed on the first substrate; a second electrode disposed under the second substrate; and a light conversion part disposed between the first electrode and the second electrode, wherein: the light conversion part includes a plurality of partition wall portions and a plurality of receiving portions which are alternately arranged; a light conversion material comprising a dispersion and multiple light conversion particles dispersed in the dispersion is disposed in the receiving portions; and the dispersion comprises a material having a carbon number of 2 to 13.