LCD Pixel and Reference Electrode Layout for Lower Parasitic Capacitance
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Solution Overview
Problem
Liquid crystal displays face challenges with reduced side visibility and increased power consumption due to parasitic capacitance and aperture ratio reduction, particularly when pixel electrodes and reference electrodes are formed on one substrate.
Innovation Solution
The liquid crystal display design includes a first and second thin film transistor positioned at the right and left of data lines, respectively, with a reference electrode having branch electrodes and a connection unit, and uses a column inversion method to reduce parasitic capacitance and power consumption while maintaining aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If pixel electrodes and reference electrodes are formed on one substrate, then side visibility is improved, but parasitic capacitance increases
Solution Approach 1:
The pixel electrode is divided into multiple segments (first pixel electrode segment, second pixel electrode segment, third pixel electrode segment) arranged in different orientations. This segmentation allows the electrode to achieve wide viewing angle coverage while reducing the parasitic capacitance between adjacent electrodes by distributing the electrode structure across multiple smaller elements with controlled spacing.
2Object-generated harmful factors
If the interval between electrodes and data line is increased to reduce parasitic capacitance, then parasitic capacitance decreases, but aperture ratio is reduced
Solution Approach 1:
The electrode structure extends in multiple dimensional directions (first direction, second direction, third direction) rather than being confined to a single plane. This multi-dimensional arrangement allows the electrodes to maintain close spacing in some dimensions while creating sufficient separation in other dimensions, thereby reducing parasitic capacitance without sacrificing aperture ratio.
3Area of stationary object
If reference electrode is formed on data line to increase aperture ratio, then aperture ratio increases, but data load increases and power consumption increases
Solution Approach 1:
The reference electrode is extracted from the data line structure and positioned as a separate element. Specifically, the reference electrode is formed on the insulating film rather than being integrated with the data line, which reduces the data load on the data line and consequently lowers power consumption while maintaining a high aperture ratio through the multi-directional electrode arrangement.
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 design effectively reduces power consumption and parasitic capacitance without compromising the aperture ratio, enhancing viewing angle performance and efficiency.
Implementation Method 1
The liquid crystal display generates an electric field in the liquid crystal layer by applying voltage to the field generating electrodes, to determine a direction of liquid crystal molecules of the liquid crystal layer and controls the transmittance of light passing through the liquid crystal layer
Implementation Method 2
determine a direction of liquid crystal molecules of the liquid crystal layer and controls the transmittance of light passing through the liquid crystal layer
Data Source
AI summary
A liquid crystal display includes first and second gate lines and first and second data lines, on a first substrate, a first thin film transistor connected to the first gate and data lines and including a first source and drain electrode, a second thin film transistor connected to the second gate and data lines and including a second source and drain electrode, first and second pixel electrodes contacting a portion of the first and second drain electrodes, respectively, a passivation layer on the first and second pixel electrodes and the first and second thin film transistors, and a reference electrode on a passivation layer and overlapping the first pixel electrode and the second pixel electrode. The reference electrode includes a plurality of branch electrodes. The first thin film transistor is right of the first data line and the second thin film transistor is left of the second data line.