Liquid Crystal Panel Electrode Arrangement for Ghosting Reduction
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Solution Overview
Problem
Display devices with cameras arranged on the rear side of a liquid crystal panel suffer from image deterioration due to light diffraction, resulting in ghosting or interference fringes around the imaging target, particularly when capturing images through the panel.
Innovation Solution
The display device incorporates a liquid crystal panel with a unique configuration of linear electrodes in the imaging region, where the electrodes are arranged with irregularly distributed intervals to minimize diffraction and control the liquid crystal layer's orientation for reduced ghosting, using a combination of fringe field switching and in-plane switching methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a camera is arranged on the rear side of a liquid crystal panel to image subjects facing the display screen, then it is possible to capture images through the panel, but light diffraction occurs causing ghosting or interference fringes around the imaging target
Solution Approach 1:
The patent applies asymmetry by arranging linear electrodes with irregular intervals in the imaging region. Instead of uniform spacing, the electrodes are positioned at varying distances from each other, which disrupts the periodic structure that causes diffraction. This asymmetric arrangement effectively reduces ghosting and interference fringes while maintaining the imaging capability through the liquid crystal panel.
Solution Approach 2:
The patent implements local quality by differentiating the electrode arrangement between the imaging region and other regions. In the imaging region, linear electrodes are arranged with irregular intervals to minimize diffraction, while other regions may use conventional electrode patterns. This localized optimization allows the system to maintain imaging performance without compromising overall display functionality.
2Object-affected harmful factors
If linear electrodes are arranged with irregular intervals to reduce diffraction, then ghosting is reduced, but the electrode configuration becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing the liquid crystal panel into distinct regions: an imaging region where linear electrodes with irregular intervals are arranged to reduce diffraction, and other regions that may use conventional electrode patterns. This segmentation allows the complex irregular electrode arrangement to be confined to only the necessary imaging area, rather than requiring complex patterns across the entire panel.
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 effectively reduces the occurrence of ghosting in captured images by controlling the liquid crystal layer's transmittance and electric field distribution, enhancing image quality during imaging through the liquid crystal panel.
Implementation Method 1
using a combination of fringe field switching and in-plane switching methods
Implementation Method 2
using a combination of fringe field switching and in-plane switching methods
Implementation Method 3
image deterioration due to light diffraction, resulting in ghosting or interference fringes around the imaging target
Data Source
AI summary
A display device comprises a liquid crystal panel including a plurality of pixels and an imaging device arranged on a back side of the liquid crystal panel. The imaging device has an imaging region overlaps with the imaging device and the other region other than the imaging region in a plan view. A plurality of linear electrodes is arranged separately from each other in the imaging region. Among the plurality of linear electrodes, a first pair of linear electrodes are separated by a first interval and a second pair of linear electrodes are separated by a second interval different from the first interval in a plan view. The first pair of linear electrodes and the second pair of linear electrodes are irregularly arranged.