Active Matrix Substrate Wiring Layout for Narrow Picture Frame
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Solution Overview
Problem
Conventional liquid crystal display devices have limitations in reducing the size of the wiring region and increasing the gap between adjacent wirings, particularly due to the large size of amorphous silicon transistors and the need for additional lead wires for resetting floating wiring, which hinders picture frame narrowing and yield improvement.
Innovation Solution
The active matrix substrate configuration includes a first, second, and third transistor, a floating wiring, a switching wiring, and a signal supply branch wiring that electrically connect within the drive circuit, forming an intersecting portion with the switching wiring, where the third transistor's gate electrode includes the switching wiring, and either the source or drain electrode includes the signal supply branch wiring, eliminating the need for an additional lead wire and allowing for picture frame narrowing and increased wiring gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional lead wire is provided to reset floating wiring to predetermined potential, then the floating wiring can be reset, but the wiring region size increases and gap between adjacent wirings decreases
Solution Approach 1:
The patent merges the additional lead wire function with the existing switching wiring by making the switching wiring also serve as the lead wire for resetting the floating wiring. The third transistor's drain electrode is connected to the floating wiring through the switching wiring, eliminating the need for a separate lead wire while maintaining the reset function.
Solution Approach 2:
The switching wiring is given multiple functions: it serves as both the switching signal transmission path and the lead wire for resetting the floating wiring. This multi-functionality approach allows the same wiring structure to perform multiple tasks, reducing the overall wiring region size.
2Length of moving object
If transistor size is reduced to narrow picture frame, then picture frame width decreases, but manufacturing precision and yield may be affected due to smaller wiring gaps
Solution Approach 1:
The patent utilizes the vertical dimension by having the switching wiring intersect with and connect to the floating wiring through the third transistor. This spatial arrangement in multiple dimensions allows for efficient use of wiring space while maintaining adequate gaps between adjacent wirings, thus narrowing the picture frame without compromising manufacturing precision.
3Ease of manufacture
If amorphous silicon transistor is used, then transistor can be fabricated, but transistor size becomes large increasing layout limitations
Solution Approach 1:
The patent segments the transistor functions by using the third transistor specifically for connecting the floating wiring to the switching wiring, while other transistors handle different functions. This segmentation allows for optimized layout where the third transistor is strategically positioned at the intersecting portion, reducing overall layout limitations despite the inherent size of amorphous silicon transistors.
Data Source
AI summary
The present invention provides an active matrix substrate in which a peripheral can be narrowed or a gap between adjacent wirings increased to improve a yield. The present invention is an active matrix substrate in which a peripheral region is provided outside a display region. In the active matrix substrate, a first, a second, and a third transistor, a floating wiring, a switching wiring, a main wiring, and a branch wiring electrically connected with the main wiring are arranged in the peripheral region. The floating wiring and branch wiring each electrically connect the first and second transistors and comprise an intersecting portion intersecting with the switching wiring, with the third transistor being provided at the intersecting portion. A gate electrode of the third transistor includes the switching wiring, one of a source electrode and a drain electrode thereof includes the branch wiring, and the other of the source electrode and the drain electrode includes the floating wiring.