IPS-LCD Pixel Electrode Block Width Gradient for Brightness Uniformity
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Solution Overview
Problem
In-plane switching liquid crystal display (IPS-LCD) devices suffer from reduced aperture ratio and non-uniform brightness due to the formation of pixel and common electrodes in the pixel region, leading to decreased brightness and poor image quality.
Innovation Solution
The design involves forming blocks in the pixel region with varying widths of pixel and common electrodes, where the widths of the blocks adjacent to the data lines are wider than those further from the center, creating a gradient of electric fields that ensures uniform light transmittance and improved image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If pixel and common electrodes are formed in the pixel region to enable in-plane switching operation, then wide viewing angle is achieved, but aperture ratio is reduced and brightness becomes non-uniform
Solution Approach 1:
The patent applies local quality by making the block widths non-uniform across the pixel region. Specifically, blocks adjacent to the data line have different widths compared to blocks farther from the data line. This local variation in block width compensates for the non-uniform electric field distribution caused by the data line, thereby achieving uniform brightness across the entire pixel region while maintaining the in-plane switching configuration for wide viewing angle
2Adaptability or versatility
If pixel and common electrodes are formed in the pixel region, then in-plane switching function is enabled, but aperture ratio is reduced
Solution Approach 1:
The patent segments the pixel electrode and common electrode into multiple alternating blocks rather than using continuous electrodes. This segmentation allows for optimized spacing and width distribution of the blocks, particularly with the non-uniform width design where blocks near the data line have different widths. This segmentation strategy enables the in-plane switching function while minimizing the total electrode area to maintain higher aperture ratio
3Ease of manufacture
If uniform block widths are used in the pixel region, then manufacturing is simplified, but brightness becomes non-uniform due to electric field distribution
Solution Approach 1:
The patent implements local quality by varying the widths of blocks based on their position relative to the data line. Blocks adjacent to the data line have different widths compared to blocks farther away, creating a gradient distribution that compensates for the non-uniform electric field. This approach requires modified fabrication patterns but can be achieved through standard photolithography processes with adjusted mask designs
4Illumination intensity
If non-uniform block widths are used with wider blocks adjacent to data lines, then brightness uniformity is improved, but device complexity increases
Solution Approach 1:
The patent introduces asymmetry in the block width design, where blocks adjacent to the data line have different widths compared to blocks farther from the data line. This asymmetric configuration is specifically designed to counteract the non-uniform electric field distribution caused by the data line. While this increases structural complexity compared to uniform blocks, the asymmetry is systematic and can be implemented through standardized design rules
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 results in uniform brightness across the pixel region and enhanced image quality while maintaining the same aperture ratio as existing IPS-LCD devices, addressing the issues of reduced brightness and non-uniformity.
Implementation Method 1
The liquid crystal display (LCD) devices use the optical anisotropy and polarization properties of liquid crystal molecules to produce an image. Due to the optical anisotropy, the refraction of incident light depends on the alignment direction of the liquid crystal molecules.
Implementation Method 2
The liquid crystal display (LCD) devices use the optical anisotropy and polarization properties of liquid crystal molecules to produce an image.
Implementation Method 3
A voltage applied across the common and pixel electrodes 17 and 30 produces an electric field L, which is parallel to the upper and lower substrates 9 and 10, through liquid crystal molecules of the liquid crystal layer 11.
Implementation Method 4
The liquid crystal layer 11 has a positive dielectric anisotropy, and thus the liquid crystal molecules align substantially parallel to the electric field L.
Data Source
AI summary
An in-plane switching liquid crystal display device includes a gate line and a data line on a substrate, the gate and data lines crossing each other to define a pixel region, a thin film transistor electrically connected to the gate and data lines, a pixel electrode connected to the thin film transistor, and a common electrode alternately arranged with the pixel electrode to form n blocks in the pixel region. Widths of some of the blocks are different than widths of other of the blocks.