Liquid Crystal Device Louver Structure for Viewing Angle Control
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Solution Overview
Problem
Current liquid crystal devices with louver layers for controlling viewing angles are costly to manufacture and require complex layering processes, which increases production expenses and device thickness.
Innovation Solution
A liquid crystal device design featuring a louver portion with light-shielding members arranged on a transparent substrate at a specific pitch, covered by an organic insulating film and overcoat layer, along with a liquid crystal lens portion to control light emission direction, simplifying the manufacturing process and reducing costs by eliminating the need for alternate light-transmitting and light-shielding layer superposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a louver layer is formed by stacking light-transmitting layer and light-shielding layer alternately, then light transmission angle control is achieved, but manufacturing cost increases and device thickness increases
Solution Approach 1:
The patent extracts the light-shielding function from the complex alternating layer structure and concentrates it into discrete light-shielding members (strip-shaped or columnar structures) positioned on the transparent substrate. This eliminates the need for multiple alternating layers while maintaining the light transmission angle control function, thereby reducing manufacturing cost and simplifying the layer structure.
Solution Approach 2:
The patent transitions from a two-dimensional alternating layer pattern to a three-dimensional structure where light-shielding members rise vertically from the substrate surface. This dimensional change allows light transmission angle control through the spatial arrangement and height of individual shielding elements rather than through horizontal layer stacking, reducing overall device thickness and manufacturing complexity.
2Device complexity
If a louver layer is formed by stacking light-transmitting layer and light-shielding layer alternately, then light transmission angle control is achieved, but device thickness increases
Solution Approach 1:
The patent removes the redundant light-transmitting layers from the alternating stack, keeping only the essential light-shielding members on a transparent substrate. This extraction reduces the number of layers from multiple alternating pairs to a single functional layer with discrete shielding elements, thereby reducing device thickness while maintaining structural simplicity.
Solution Approach 2:
The patent uses vertical height variation of light-shielding members to control light transmission angles instead of using multiple horizontal layers. By controlling the height and positioning of these three-dimensional elements, the patent achieves the same optical function with reduced thickness in the layer stacking direction.
3Ease of manufacture
If light-shielding members are arranged at a specific pitch on transparent substrate, then manufacturing cost is reduced, but light emission direction control effectiveness must be maintained
Solution Approach 1:
The patent applies different properties to different parts of the light-shielding members: the strip-shaped or columnar geometry provides local light blocking at specific positions, while the transparent substrate and overcoat layers provide uniform light transmission in other areas. This local differentiation allows simple manufacturing processes while maintaining precise control over light emission directions through the strategic placement and shaping of individual shielding elements.
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 reduces manufacturing costs and device thickness while maintaining effective control over light emission direction, enabling both narrow and wide viewing angle displays with improved display quality and reduced moiré visibility.
Implementation Method 1
a liquid crystal lens portion (4) which adjusts the degree of divergence of the collimated incident light
Implementation Method 2
a louver portion (3) which regulates the emission direction of incident light (illumination light) and collimates the incident light
Data Source
AI summary
According to one embodiment, a liquid crystal device includes a plurality of light-shielding members arranged at a first pitch in a first direction, a overcoat layer covering the light-shielding members, and a plurality of first electrodes arranged on the overcoat layer in the first direction at a second pitch that is smaller than the first pitch. The light-shielding members are each formed as a wall having a width along the first direction and a thickness that is greater than the width.