IPS LCD Boundary Region Shielding via Data Line Overlap
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Solution Overview
Problem
Liquid crystal display devices with in-plane switching (IPS) mode suffer from display quality issues due to disturbances in the electric field at boundary regions within pixel areas, leading to non-transmitting disclination regions that affect image clarity.
Innovation Solution
The implementation of a liquid crystal display device with a multi-domain structure, where the third data line overlaps the boundary area between sections of the pixel region, minimizing the 'blur' effect by shielding it from light and eliminating the need for additional gate lines, thereby improving aperture ratio and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a multi-domain structure with slits of different inclined angles is implemented to improve viewing angle characteristics, then viewing angle characteristics are improved, but disturbance of electric field occurs at boundary regions causing disclination regions that reduce display quality
Solution Approach 1:
The patent extracts and removes the boundary region between different slit sections from the pixel region by positioning the data line to overlap with it. This eliminates the harmful electric field disturbance and disclination region that would otherwise occur at the boundary, thereby improving display quality while maintaining the multi-domain structure's viewing angle benefits
Solution Approach 2:
The data line serves as an intermediary element that overlaps with the boundary region between sections having different slit inclined angles. This positioning allows the data line to shield the boundary region from light, preventing the formation of visible disclination regions while still allowing the multi-domain structure to function for improved viewing angles
2Adaptability or versatility
If additional gate lines are added to control the multi-domain structure, then viewing angle characteristics are improved, but device complexity and aperture ratio are worsened
Solution Approach 1:
The patent makes the data line serve multiple functions: it not only transmits data signals but also overlaps with and shields the boundary region between slit sections. This eliminates the need for additional gate lines that would otherwise be required to control the multi-domain structure, thereby reducing device complexity while maintaining improved viewing angle characteristics
Solution Approach 2:
The patent merges the function of boundary region control with the existing data line structure. By positioning the data line to overlap with the boundary region, the same conductive element serves both as a data transmission line and as a structural element that defines and shields the boundary between domains, eliminating the need for separate control gate lines
3Adaptability or versatility
If additional gate lines are added to control the multi-domain structure, then viewing angle characteristics are improved, but aperture ratio is reduced
Solution Approach 1:
The data line is made to serve dual purposes: data transmission and boundary region shielding. By positioning it to overlap with the boundary region, it eliminates the need for additional gate lines that would reduce the aperture ratio, thereby maintaining high aperture ratio while still achieving improved viewing angle characteristics through the multi-domain structure
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 enhances the display quality by reducing the 'blur' effect and improving the aperture ratio, allowing for better light modulation and image clarity without compromising the display's overall quality.
Implementation Method 1
The pixel electrodes and the common electrodes generate an electric field therebetween. The light passes through the region between the pixel electrode and the common electrode, and the quantity of light is controlled by driving the liquid crystals in the liquid crystal layer based on the applied electric field.
Implementation Method 2
it is possible to rotate liquid crystal molecules on the Y1-side of the pixel region PXL and liquid crystal molecules on the Y2-side of the pixel region PXL in different rotational directions
Data Source
AI summary
A liquid crystal display device of an in-plane switching mode is provided. The liquid crystal display device includes a first gate line and a second gate line. The liquid crystal display device also includes a first data line, a second data line, and a third data line. The liquid crystal display device further includes a first electrode and a second electrode formed in a pixel region surrounded by the first gate line, the second gate line, the first data line, and the second data line. The first electrode includes a first set of slits extending along a first direction in a first section of the pixel region and a second set of slits extending along a second direction in a second section of the pixel region. The third data line overlaps a boundary area between the first section and the second section in the pixel region in plan view.