In-Plane Switching Electrode Structure for Wide Viewing Angle Displays
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Solution Overview
Problem
Existing 3-dimensional display devices suffer from narrow viewing angles and significant color change when the viewing angle is altered, making them unsuitable for applications requiring wide viewing angles and color uniformity, such as multimedia and medical imaging.
Innovation Solution
The implementation of an in-plane switching (IPS) or fringe field switching (FFS) mode structure for the switching panel, where the pixel electrode and common electrode are formed on a lower substrate, along with the use of a lenticular lens and a polymer dispersed liquid crystal (PDLC) layer, to maintain image quality and reduce color change across varying viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a conventional liquid crystal display structure is used, then the device complexity is low, but the viewing angle is narrow and color change is significant
Solution Approach 1:
The patent transitions from a conventional vertical electric field switching mode to an in-plane switching mode where electrodes are arranged horizontally on the same substrate. This dimensional reorganization of the electrode structure enables wider viewing angles and reduced color change by changing the direction of electric field application relative to the liquid crystal molecules.
Solution Approach 2:
The patent modifies the electrode configuration parameters by placing both pixel and common electrodes on the lower substrate in an in-plane arrangement, rather than using the traditional stacked configuration. This parameter change in electrode geometry and positioning directly improves color uniformity across different viewing angles.
2Adaptability or versatility
If a parallax barrier panel is used for 3-dimensional display, then the 3-dimensional image can be displayed, but the viewing angle remains narrow and color change occurs
Solution Approach 1:
The patent combines the parallax barrier method with an in-plane switching liquid crystal panel, where the electrode arrangement is reorganized from vertical to horizontal dimensions. This dimensional change in the liquid crystal layer's switching mechanism complements the parallax barrier structure to achieve both 3-dimensional display capability and improved color uniformity across viewing angles.
Solution Approach 2:
The patent creates a composite display structure that integrates the parallax barrier panel with an in-plane switching liquid crystal panel. This composite configuration combines the depth perception capability of the parallax barrier with the wide viewing angle and color stability of the IPS/FFS liquid crystal mode.
3Ease of manufacture
If the pixel electrode and common electrode are formed on different substrates, then the manufacturing is simpler, but the viewing angle is narrow and color change is significant
Solution Approach 1:
The patent merges the pixel electrode and common electrode onto the same lower substrate in an in-plane configuration, rather than keeping them on separate substrates. This consolidation enables the electrodes to work together in a horizontal electric field arrangement, achieving wide viewing angles and reduced color change while maintaining manufacturing feasibility through integrated electrode patterning.
4Reliability
If a conventional switching panel structure is used, then the device complexity is low, but the image quality degrades at oblique viewing angles
Solution Approach 1:
The patent reorganizes the switching panel structure from a vertical electric field configuration to an in-plane horizontal configuration. This dimensional change ensures that the liquid crystal molecules switch in a plane parallel to the substrate, maintaining consistent image quality across wide viewing angles by eliminating the directional limitations of conventional vertical switching modes.
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 configuration allows for stable 2-dimensional and 3-dimensional image display with reduced color change and improved viewing angles, enhancing the display device's performance in applications like multimedia, medical imaging, and virtual reality.
Implementation Method 1
a lenticular lens that converts the image of the liquid crystal panel into a 3-dimensional image
Implementation Method 2
a switching panel between the liquid crystal panel and the lenticular lens, the switching panel using a polymer liquid crystal layer
Data Source
AI summary
Provided are a 2-dimensional and 3-dimensional image display device and a method of manufacturing the same. The display device includes: an image display panel including first and second substrates with a first liquid crystal layer interposed therebetween; a switching panel including third and fourth substrates with a second liquid crystal layer interposed therebetween; and a backlight unit for supplying light to the image display panel and the switching panel.