Strip-Shaped Common Electrodes for Array Substrates
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Solution Overview
Problem
Existing HADS mode TFT-LCDs face increased power consumption and display issues due to coupling capacitance between common and data lines, leading to adverse effects like greenish display and crosstalk.
Innovation Solution
The array substrate design features strip-shaped common electrodes only disposed over pixel electrodes, with an insulating layer and a resin layer strategically placed to reduce coupling capacitance and minimize the impact of data lines on the electric field, thereby optimizing electric field generation and light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If strip-shaped common electrodes are disposed over data lines to increase opening ratio, then light transmittance is improved, but coupling capacitance increases leading to higher power consumption
Solution Approach 1:
The common electrode is divided into strip-shaped segments that are selectively disposed only in regions where they are needed for electric field generation, rather than forming a continuous electrode over the data line. This segmentation reduces the overlapping area between common and data lines, thereby reducing coupling capacitance while maintaining sufficient light transmittance through the transparent electrode material.
Solution Approach 2:
The common electrode structure is designed with different spatial distributions: strip-shaped regions aligned with pixel electrodes for effective electric field generation, and avoidance of regions over data lines to minimize coupling capacitance. This local differentiation optimizes both light transmittance in pixel areas and power consumption by reducing parasitic capacitance in data line regions.
2Illumination intensity
If common electrode and pixel electrode are placed close together to increase opening ratio, then light transmittance is improved, but fringing electric field causes adverse effects like greenish display and crosstalk
Solution Approach 1:
An insulating layer is introduced as an intermediary between the common electrode and the pixel electrode. This insulating layer acts as a mediator that allows the electrodes to be positioned close together for high opening ratio and light transmittance, while simultaneously preventing direct electrical interaction that would cause fringing electric fields, greenish display, and crosstalk between adjacent pixels.
Solution Approach 2:
The problem of electric field interference between closely spaced electrodes is solved by transitioning from a two-dimensional planar arrangement to a three-dimensional structure with vertical layering. The insulating layer creates a vertical separation dimension, allowing horizontal proximity for high opening ratio while maintaining electrical isolation to prevent fringing field effects.
3Illumination intensity
If common electrode is made of transparent conductor to increase opening ratio, then light transmittance is improved, but coupling capacitance with data line increases power consumption
Solution Approach 1:
The transparent common electrode is segmented into discrete strip-shaped regions that are positioned only where needed for liquid crystal modulation, rather than forming a continuous electrode that would maximize coupling capacitance with the data line. This segmentation maintains sufficient transparency for light transmittance while minimizing the capacitive load on the data line.
Solution Approach 2:
The common electrode structure implements local quality differentiation by using transparent conducting material in pixel electrode regions for light transmittance, while avoiding placement over data line regions to minimize coupling capacitance. The strip-shaped configuration optimizes the local distribution to balance optical and electrical performance.
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 reduces power consumption and mitigates display issues by minimizing coupling capacitance, enhancing optical characteristics and reducing the adverse effects on the liquid crystal layer.
Implementation Method 1
an insulating layer disposed between the strip-shaped common electrodes and the pixel electrode
Implementation Method 2
a pixel electrode, strip-shaped common electrodes that are configured to cooperate with the pixel electrode to generate electric field
Implementation Method 3
a fringing electric field is produced between the common electrode and the pixel electrode
Implementation Method 4
the above-mentioned array substrate further comprises a resin layer disposed between the data line and the strip-shaped common electrodes
Data Source
AI summary
An array substrate, a display panel and a display device are disclosed. The array substrate includes a plurality of pixel areas defined by a plurality of gate lines intersecting a plurality of data lines. Each pixel area includes: a pixel electrode (2), strip-shaped common electrodes (3) which cooperate to generate electric fields with the pixel electrode (2), and an insulating layer (4) disposed between the pixel electrode (2) and strip-shaped common electrodes (3). The strip-shaped common electrodes (3) are only disposed over the pixel electrode (2) to reduce coupling capacitance formed between the data line and the common electrodes.