Pixel Unit Array with Variable Width Electrodes for LCD Color Shift Reduction
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Solution Overview
Problem
Conventional Fringe Field Switching (FFS) type LCD panels experience color shift due to the close proximity of stripe-shaped electrodes, leading to color mixing and reduced transmittance, as the resolution limitations of photo-lithography machines restrict the reduction of electrode width and gap between adjacent electrodes.
Innovation Solution
A pixel unit array design featuring alternately arranged first and second pixel units with distinct electrode configurations, where the second electrode has a first part with a narrower width and a second part with a wider width, ensuring that adjacent pixel units are not driven by the electric field, thereby reducing color shift while maintaining high transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the stripe-shaped electrode width and gap between adjacent electrodes are reduced to improve resolution, then the manufacturing precision is improved, but the color shift problem worsens due to increased proximity of electrodes in adjacent pixel units
Solution Approach 1:
The pixel electrode is divided into multiple stripe-shaped electrodes (first stripe-shaped electrodes and second stripe-shaped electrodes) within a single pixel unit. This segmentation allows the electrode structure to be more complex while maintaining the ability to control electric field distribution, thereby reducing color shift without sacrificing resolution
Solution Approach 2:
Different regions of the pixel electrode have different structures: the first stripe-shaped electrodes have a first width while the second stripe-shaped electrodes have a second width (different from the first width). This local differentiation allows optimization of electric field distribution in different areas, preventing unwanted liquid crystal molecule rotation in adjacent pixel units while maintaining driving capability in the current pixel unit
2Illumination intensity
If the number of stripe-shaped electrodes in one pixel unit is increased to improve driving capability, then the transmittance is improved, but the color shift problem worsens due to increased proximity of electrodes in adjacent pixel units
Solution Approach 1:
The pixel electrode incorporates first stripe-shaped electrodes with a first width and second stripe-shaped electrodes with a second width (different from the first width). This local differentiation of electrode widths allows optimization of electric field distribution: narrower electrodes reduce cross-pixel driving while wider electrodes maintain sufficient driving capability and transmittance within the pixel unit
Solution Approach 2:
The invention transitions from a single-width electrode design to a multi-width electrode design, adding a dimensional variation to the electrode structure. This allows simultaneous optimization of multiple parameters (transmittance, driving capability, color shift prevention) that cannot be achieved with uniform electrode width
3Manufacturing precision
If the electrode width and gap are reduced to improve resolution, then the manufacturing precision is improved, but the transmittance decreases due to reduced light passing through the pixel unit
Solution Approach 1:
Different regions of the pixel electrode have different widths: the first stripe-shaped electrodes have a first width while the second stripe-shaped electrodes have a second width. This local differentiation allows optimization of both resolution (through precise electrode positioning) and transmittance (through strategic wider regions that allow more light passage)
Solution Approach 2:
The invention introduces variable width as an additional dimension of electrode design. By varying the electrode width across different regions (first width for some stripes, second width for others), the design achieves both high resolution through precise patterning and high transmittance through optimized light passage areas
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 design effectively reduces noticeable color shift and maintains high transmittance by ensuring that only the intended pixel units are driven, allowing for improved image display without color mixing.
Implementation Method 1
When a horizontal electric field is used to drive both the FFS type and the IPS type, the FFS type has been proven to achieve high resolution and wide viewing angles in LCDs
Implementation Method 2
Each pixel unit comprises a first electrode, a second electrode and an insulating layer between the first electrode and the second electrode
Data Source
AI summary
A pixel unit array is provide. The pixel unit array comprises a plurality of pixel units including a plurality of first pixel units and a plurality of second pixel units alternately arranged in a pixel direction. Each pixel unit comprises a first electrode, a second electrode and an insulating layer between the first electrode and the second electrode. The second electrode further includes a first part and a second part connected to the first part. The first part includes an N number of first stripe-shaped electrodes, and the second part includes an M number of second stripe-shaped electrodes. The first part in the second electrode has a width of a1, the second part in the second electrode has a width of a2, and a1<a2.