Viewing Angle Control Panel Layout for Small-Angle Display Privacy
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Solution Overview
Problem
Existing vehicle display devices have inferior privacy capabilities at small viewing angles, typically less than 45°, which is insufficient for privacy needs.
Innovation Solution
A display device incorporating a display panel with a light-shielding layer and a viewing angle control panel, utilizing a light-shielding layer with specific opening regions and a viewing angle control panel with aligned liquid crystal directors to enhance privacy at small viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing privacy designs are used in vehicle displays, then the viewing angle can be extended to 30°-60°, but the privacy capability at small viewing angles (less than 45°) deteriorates
Solution Approach 1:
The patent applies local quality by creating asymmetric opening regions in the light-shielding layer with different edge configurations. Specifically, the opening regions have first edges extending along a first direction and second edges extending along a second direction, with different lengths and spacing arrangements. This local structural variation optimizes light blocking performance specifically at small viewing angles while maintaining overall viewing angle coverage, thereby resolving the contradiction between extended viewing angle range and privacy capability at small angles.
Solution Approach 2:
The patent employs asymmetry principle by designing opening regions where the first length (along the first direction) is different from the second length (along the second direction), and the spacing between first edges differs from the spacing between second edges. This asymmetric configuration creates direction-dependent light transmission characteristics that enhance privacy at small viewing angles while preserving the required viewing angle range, thus resolving the technical contradiction.
2Ease of manufacture
If the light-shielding layer uses conventional opening region design, then manufacturing is simpler, but privacy capability at small viewing angles deteriorates
Solution Approach 1:
The asymmetric opening region design with specific edge length relationships (first length < first distance, second length < second distance) maintains compatibility with conventional manufacturing processes while achieving superior privacy performance at small viewing angles. The local structural modifications can be integrated into existing photolithography and patterning workflows, resolving the contradiction between manufacturing simplicity and privacy capability.
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 enhanced privacy capabilities at small viewing angles, reducing luminance to less than 1% at angles between 33° and 64°, effectively maintaining privacy in vehicle displays.
Implementation Method 1
The viewing angle control panel overlaps the display panel and has a direction of liquid crystal director. An angle between the direction of liquid crystal director and the first direction is from −25° to 25° or from 155° to 205°.
Implementation Method 2
The display panel includes a light-shielding layer, and the light-shielding layer has multiple opening regions
Implementation Method 3
The first polarizing plate is disposed on a surface opposite to a light-emitting surface of the display panel and having a first absorption axis, wherein the first absorption axis is parallel to the first direction.
Data Source
AI summary
A display device includes a display panel, a viewing angle control panel and a first polarizing plate. The display panel includes a data line, a scan line and a first electrode. The data line extends along a first direction. The scan line extends along a second direction and intersecting with the data line. The first electrode has a plurality of fingers, wherein the plurality of fingers are arranged along the first direction. The viewing angle control panel overlaps the display panel. The first polarizing plate is disposed on a surface opposite to a light-emitting surface of the display panel and having a first absorption axis, wherein the first absorption axis is parallel to the first direction.