Visible-Angle Display Panel With Graded Cell Gaps
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Solution Overview
Problem
Existing display devices provide uneven anti-spy effects, failing to uniformly protect user privacy as they only achieve satisfactory privacy for specific visible angles.
Innovation Solution
A display device with a visible angle adjustment panel featuring a liquid-crystal layer having varying cell gaps and a thickness gradient, along with a height-adjustable adjustment layer, to uniformly control visibility across different angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional display device with uniform cell gap is used, then the structure is simple and easy to manufacture, but the anti-spy effect is uneven and only satisfactory for specific visible angles
Solution Approach 1:
The liquid crystal layer is divided into multiple regions with different cell gap thicknesses. The cell gap is segmented into a first cell gap in a first area and a second cell gap in a second area, where the thicknesses are different. This segmentation allows each region to control light leakage at different angles, achieving uniform anti-spy effect across the entire display surface.
Solution Approach 2:
Different areas of the display device are assigned different cell gap thicknesses to optimize local anti-spy performance. The first area has a first cell gap thickness optimized for specific viewing angles, while the second area has a second cell gap thickness optimized for other viewing angles. This local quality variation ensures that each region provides effective privacy protection for its specific viewing direction.
2Reliability
If the cell gap thickness is increased to reduce light leakage, then the anti-spy effect improves, but the viewing angle and brightness for legitimate users are reduced
Solution Approach 1:
The display is divided into multiple areas with different cell gap thicknesses optimized for different viewing scenarios. Areas requiring higher brightness for legitimate users have thinner cell gaps, while areas requiring stronger anti-spy effect have thicker cell gaps. This segmentation allows simultaneous optimization of both brightness and anti-spy effectiveness without compromising either.
Solution Approach 2:
The cell gap thickness parameter is varied across different areas of the display to achieve different optical properties. By changing the cell gap thickness from the first value in the first area to the second value in the second area, the patent optimizes the balance between light leakage reduction and brightness maintenance for different viewing angles and user needs.
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 provides a more uniform anti-spy effect by ensuring different areas of the display device appear darker from oblique views, enhancing user privacy and safety, particularly in vehicle applications.
Implementation Method 1
a liquid-crystal layer disposed between the two substrates and an adjustment layer disposed between the liquid-crystal layer and one of the two substrates. The liquid-crystal layer has a plurality of cell gaps, the thicknesses of the cell gaps are different from each other
Data Source
AI summary
A display device is provided. The display device includes a display panel and a visible angle adjustment panel on the display panel. The visible angle adjustment panel includes two substrates, a liquid-crystal layer disposed between the two substrates and an adjustment layer disposed between the liquid-crystal layer and one of the two substrates. The liquid-crystal layer has a plurality of cell gaps, the thicknesses of the cell gaps are different from each other, and the thicknesses of the cell gaps gradually increase along a direction, and a height of the adjustment layer gradually decreases along the direction.