Optical Path Control Member for Display Devices
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Solution Overview
Problem
The existing light blocking films used in display devices suffer from visibility issues due to the moire phenomenon caused by the overlapping patterns with the display panel, and they have a significant bezel region that reduces the effective display area.
Innovation Solution
An optical path control member is designed with a light conversion part that includes partition wall and reception parts alternately disposed, where the reception part's light transmittance changes with voltage application, and its surface is inclined to reduce the bezel region and prevent moire, featuring a first and second electrode connected through a connection portion on the edge regions of substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a light blocking film with pattern portion is used to control viewing angle, then light transmission in specific direction is improved, but moire phenomenon occurs due to overlapping with display panel pattern
Solution Approach 1:
The patent extracts the pattern portion from the light blocking film, creating a transparent area where the electrode connection is located. This removal of the pattern in the connection region eliminates the moire phenomenon that would occur from overlapping patterns between the light blocking film and display panel, while maintaining viewing angle control in the display region.
Solution Approach 2:
The light blocking film is designed with different properties in different regions: the display region has a pattern portion for viewing angle control, while the connection region has a transparent area without pattern. This local differentiation allows the film to simultaneously achieve viewing angle control where needed and eliminate moire where electrode connection occurs.
2Ease of operation
If electrode connection portion is included in the light blocking film, then electrical connection is achieved, but bezel region increases reducing display area
Solution Approach 1:
The patent merges the electrode connection function with the transparent area of the light blocking film. The transparent area serves dual purposes: it allows electrode connection without causing moire phenomenon, and simultaneously reduces the bezel region by eliminating the need for separate connection structures. This integration enables electrical connection while maximizing the display area.
3Object-generated harmful factors
If pattern portion is adhered to display panel, then light blocking function is achieved, but visibility deteriorates due to moire
Solution Approach 1:
The pattern portion is extracted or removed from the connection region of the light blocking film, creating a transparent area. This extraction eliminates the overlapping pattern that causes moire phenomenon and visibility deterioration, while the display region retains its pattern for light blocking and viewing angle control functions.
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 design reduces the bezel region, enhances visibility by minimizing moire, and allows for easier connection with a printed circuit board, increasing the effective display area while maintaining high light transmittance.
Implementation Method 1
switching a pattern part to a light transmitting part and a light blocking part by filling the inside of the pattern 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; 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: each of the first substrate and the second substrate includes a first direction, a second direction different from the first direction, and a third direction defined as a thickness-direction of the first substrate and the second substrate; the light conversion part includes a partition wall part and a reception part alternately arranged; and the reception part has a light transmittance changing according to application of a voltage, extends in a fourth direction, and has a lower surface inclined at an acute angle with respect to one side surface of the first substrate.