Optical Path Control Member Sealing and Moire Reduction
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Solution Overview
Problem
Switchable light blocking films used in display devices face issues with liquid leakage and impurity penetration, leading to deteriorated driving characteristics and reliability, as well as the occurrence of moire phenomena when combined with display panels.
Innovation Solution
An optical path control member with a light conversion unit featuring partition and accommodation parts, sealed by sealing parts to prevent liquid leakage and impurity ingress, and tilted to prevent moire phenomena, reducing the bezel region and enhancing visibility and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a switchable light blocking film uses a dispersion liquid filled in accommodation parts to control viewing angle, then the light blocking function is achieved, but liquid leakage and impurity penetration occur leading to deteriorated reliability
Solution Approach 1:
The accommodation part is divided into a first region and a second region with different light conversion material heights. The first region has a smaller height than the second region, creating a stepped structure that prevents liquid leakage while maintaining the light blocking function.
Solution Approach 2:
A sealing part is introduced as an intermediary component between the accommodation part and the external environment. The sealing part fills the holes formed in the second substrate and extends along the side region of the light conversion unit, preventing liquid leakage and impurity penetration.
2Reliability
If the switchable light blocking film pattern overlaps with the display panel pattern, then the integrated display function is achieved, but moire phenomenon occurs deteriorating visibility
Solution Approach 1:
The light conversion material heights in the first and second regions are made asymmetric, with the first region having a smaller height than the second region. This asymmetric stepped structure disrupts the periodicity that causes moire phenomena while maintaining the light blocking functionality.
Solution Approach 2:
The patent introduces a height dimension variation within the accommodation part by creating regions with different light conversion material heights. This vertical dimensionality change disrupts the planar pattern overlap that causes moire phenomena.
3Reliability
If sealing parts are added to prevent liquid leakage, then reliability is improved, but device complexity increases
Solution Approach 1:
The sealing part is merged with the existing structure by filling the holes formed in the second substrate and extending along the side region of the light conversion unit. This integration approach provides sealing functionality without adding separate complex components.
Solution Approach 2:
The sealing part serves multiple functions: it seals the accommodation part to prevent liquid leakage, blocks impurity penetration, and structurally supports the light conversion unit. This multi-functionality reduces the need for additional separate 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
The solution effectively inhibits liquid leakage and impurity penetration, improves the reliability and sealing properties of the optical path control member, and minimizes moire phenomena, enhancing the overall performance and visibility of display devices.
Implementation Method 1
a switchable light blocking film may be implemented by converting an accommodation part into a light transmitting part and a light blocking part by filling the inside of the accommodation part with particles that may move when a voltage is applied and a dispersion liquid for dispersing the particles and by dispersing and aggregating the particles
Data Source
AI summary
An optical path control member according to an embodiment comprises: a first substrate on which a first direction and a second direction are defined; a first electrode arranged on the first substrate; a second substrate which is arranged on the first substrate and on which the first direction and the second direction are defined; a second electrode arranged under the second substrate; and a light conversion unit arranged between the first electrode and the second electrode, wherein the light conversion unit comprises an alternately arranged plurality of partition parts and plurality of accommodation parts, a light conversion material is arranged in the accommodation part, the accommodation part comprises at least one first region and at least one second region, and the height of the light conversion material arranged in the first region is less than the height of the light conversion material arranged in the second region.