Liquid Crystal Device Transistor Gate Length Optimization
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Solution Overview
Problem
In liquid crystal devices, the high on-resistance of transistors due to large gate length increases crosstalk and circuit area, hindering power consumption reduction and display quality in capacitor line swing driving modes.
Innovation Solution
A liquid crystal device with a configuration that includes a pixel electrode and a capacitor electrode forming a pixel capacitor, where the control circuit alternately supplies voltages to the capacitor electrode, allowing for shorter transistor gate length and reduced on-resistance, thereby minimizing crosstalk and circuit area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the gate length of transistors is increased to reduce crosstalk, then the on-resistance increases and power consumption increases, but if the gate length is decreased to reduce on-resistance, then crosstalk increases
Solution Approach 1:
The patent applies different gate lengths to different transistors based on their specific functional requirements and position in the circuit. Transistors in regions prone to crosstalk use longer gate lengths for isolation, while transistors where low on-resistance is critical use shorter gate lengths. This localized optimization resolves the contradiction by allowing each transistor to have the appropriate gate length for its specific role rather than using a uniform gate length throughout the circuit.
2Area of stationary object
If the gate length of transistors is increased to improve switching control, then the circuit area increases and window frame width increases, but if the gate length is decreased to reduce circuit area, then switching control deteriorates
Solution Approach 1:
The patent implements local quality by assigning different gate lengths to transistors based on their specific functional requirements. Transistors requiring strong switching control (such as those in critical signal paths) are given longer gate lengths, while transistors in less critical positions use shorter gate lengths to minimize circuit area. This resolves the contradiction by optimizing each transistor's gate length according to its local functional demands.
Solution Approach 2:
The patent segments the circuit into different regions with different gate length requirements. By dividing the circuit into segments based on functional importance and crosstalk susceptibility, the invention allows each segment to use appropriate gate lengths, thereby reducing overall circuit area while maintaining switching control where it is most needed.
3Loss of energy
If capacitor line swing driving is implemented to reduce power consumption, then the on-resistance of transistors must be reduced, but reducing on-resistance requires shorter gate lengths which increases crosstalk
Solution Approach 1:
The patent applies local quality by using different gate lengths in different circuit regions to enable capacitor line swing driving while controlling crosstalk. Transistors connected to capacitor lines use optimized gate lengths that balance the need for low on-resistance (to enable swing driving and reduce power consumption) with the need for sufficient gate length (to prevent crosstalk). This localized optimization allows the invention to achieve power consumption reduction through swing driving without excessive crosstalk.
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 the on-resistance of transistors, leading to lower power consumption and a narrower window frame, while maintaining display quality by effectively managing the voltage supply to the capacitor electrode.
Implementation Method 1
a pixel electrode 55 and a common electrode 56, which constitute a pixel capacitor 54, formed on the element substrate 60
Data Source
AI summary
A liquid crystal device including a plurality of scanning lines, a plurality of data lines, a plurality of pixel electrodes, a capacitor electrode, a control circuit, a scanning line driving circuit, and a data line driving circuit.