Sub-pixel Structure with Asymmetric Thin Film Transistors
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Solution Overview
Problem
Liquid crystal display devices face issues with high power consumption due to leakage currents at lower display frequencies, leading to flickering and poor display effects, as the conventional design restricts the layout of thin film transistors, resulting in shorter channel lengths and lower resistance.
Innovation Solution
A sub-pixel structure with two thin film transistors, where the first and second thin film transistors are positioned on opposite sides of the pixel electrode, increasing their layout space, allowing for longer channel lengths and higher resistance, thereby reducing leakage currents and improving display efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the conventional design restricts the layout of thin film transistors, then the device complexity is reduced, but the channel length becomes shorter and resistance becomes lower, leading to higher leakage currents
Solution Approach 1:
The pixel electrode is divided into multiple regions with different electrode potentials, creating multiple independent transistor control zones. This segmentation allows each transistor to control its specific region independently, improving leakage current control without requiring complex overall layout changes.
Solution Approach 2:
The patent extends the transistor channel length by utilizing the vertical dimension and spatial arrangement around the pixel electrode. Transistors are positioned at opposite sides of the pixel electrode, allowing longer channel paths without increasing horizontal footprint complexity.
2Use of energy by moving object
If the display frequency is reduced to save power, then energy consumption decreases, but leakage currents cause flickering and poor display effects
Solution Approach 1:
The patent changes the electrical parameters of the transistors by increasing channel length and resistance, which fundamentally alters the current control characteristics. This allows the display to maintain stable voltage levels even at lower refresh frequencies, eliminating flickering while reducing power consumption.
3Reliability
If the channel length of thin film transistors is increased, then resistance increases and leakage currents decrease, but the layout space required increases
Solution Approach 1:
The patent employs asymmetric positioning of transistors at opposite sides of the pixel electrode, allowing optimized channel paths that maximize length within available space. The first and second transistors have different orientations relative to the pixel electrode, enabling longer effective channel lengths without symmetric space requirements.
Solution Approach 2:
The transistor channels are arranged to extend in different spatial dimensions and orientations. The first transistor's channel extends in one direction while the second transistor's channel extends in another direction, allowing both to achieve long channel lengths without competing for the same linear space.
Data Source
AI summary
The present disclosure provides a sub-pixel structure, a liquid crystal panel and a reflective liquid crystal display device. The sub-pixel structure includes a pixel electrode, and a first thin film transistor and a second thin film transistor integrated on an array substrate; the first thin film transistor and the second thin film transistor are respectively close to a first side and a second side, opposite to each other, of the pixel electrode, and are adjacent to and are connected to two scanning lines in the array substrate, respectively; and a length of a channel region of the first thin film transistor is greater than a first length threshold, and a length of a channel region of the second thin film transistor is greater than a second length threshold.