Variable-Width Storage Electrode Line for LCD Resistance
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Solution Overview
Problem
The operation of display apparatuses, such as LCDs, is adversely affected by the electrical resistance of storage electrode lines, leading to delays in common voltage signals, which impacts display quality.
Innovation Solution
A TFT array panel design with storage electrode lines having a first portion with a narrower width in the display region and a wider width in the non-display region, made of the same metal, and a gate driver system that supplies gate on and off signals to the gate lines, reducing electrical resistance and improving aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the width of the storage electrode line is increased to reduce electrical resistance, then the electrical resistance decreases, but the aperture ratio of the display region decreases
Solution Approach 1:
The storage electrode line is designed with different widths in different regions: a first width in the display region and a second width in the non-display region. This local differentiation allows the line to have lower resistance where needed while maintaining aperture ratio in the display area.
Solution Approach 2:
The invention transitions from a uniform one-dimensional width to a two-dimensional width variation along the storage electrode line. The width changes from the first width to the second width at a specific position, creating a stepped or tapered structure that optimizes both electrical performance and display quality.
2Reliability
If the width of the storage electrode line is increased in the non-display region to reduce resistance, then the electrical resistance decreases, but the device complexity increases
Solution Approach 1:
The storage electrode line is segmented into two distinct portions: a first portion with a first width and a second portion with a second width. This segmentation allows each portion to be optimized independently for its specific functional requirements.
Solution Approach 2:
The physical parameter of width is changed along the length of the storage electrode line. The width transitions from a first value to a second value, creating a gradient or stepped structure that reduces resistance without requiring a complete redesign of the entire electrode system.
Data Source
AI summary
A display apparatus includes a thin film transistor array panel including a display region and a non-display region, a gate line extending along a first direction, a data line extending along a second direction, substantially perpendicular to the first direction, the data line being insulated from and crossing the gate line, a storage electrode line which receives a common voltage signal, and a first gate driver disposed on the thin film transistor array panel and which supplies at least one of a gate on signal and a gate off signal to the gate line. The storage electrode line includes a first portion extending along the first direction and a second portion extending along the second direction in the non-display region. A width, measured along the second direction, of the first portion is less than a width, measured along the first direction, of the second portion.