Display Substrate Parasitic Capacitance Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display irregularities occur in liquid crystal display panels due to variations in electric resistances and parasitic capacitances among drawing lines, leading to longitudinal streaks and increased loads on source drivers, which are difficult to correct in existing configurations.
Innovation Solution
A display panel substrate with strip conductors overlapping data signal lines and an insulating film, where connecting portions do not overlap with drawing lines, allowing for easy disconnection of shorted conductors using laser energy, thereby correcting display defects without significantly affecting parasitic capacitances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If drawing lines are arranged in bundles with taper shape to converge from active region to substrate edge, then space utilization is improved, but electric resistances and parasitic capacitances become non-uniform among drawing lines
Solution Approach 1:
The patent introduces zigzag portions in drawing lines at different positions and depths within bundles to create local variations in path length. This ensures that despite the taper shape, all drawing lines have substantially equal total lengths, making electric resistances and parasitic capacitances uniform across all drawing lines while maintaining the space-efficient bundled configuration
2Reliability
If conductor films are formed on drawing lines with insulating films to provide parasitic capacitances, then signal transmission is improved, but shorts between drawing lines and conductors become difficult to correct
Solution Approach 1:
The conductor film is divided into multiple independent segments separated by insulating film regions. When a short occurs between a drawing line and conductor, only the affected conductor segment needs to be disconnected, not the entire conductor structure. This segmentation enables localized repair while maintaining functionality of other segments
Solution Approach 2:
The insulating film serves as an intermediary element between drawing lines and conductor films. By positioning insulating films at specific locations, the patent enables selective disconnection of shorted conductors through laser beams that pass through the insulating film regions, facilitating easy correction of shorts
3Productivity
If display panel size is increased to meet market demands, then productivity is improved, but differences in electric resistances and parasitic capacitances among drawing lines are exacerbated
Solution Approach 1:
The patent预先 introduces zigzag portions in drawing lines during the manufacturing process, before the panel is assembled and tested. This preliminary adjustment of drawing line paths ensures that even in large-sized panels, all drawing lines have equal lengths and thus uniform electric resistances and parasitic capacitances, preventing display irregularities before they occur
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 enables effective correction of display defects caused by shorts between data signal lines and conductors, maintaining uniform parasitic capacitances and minimizing the influence on signal transmission, thus preventing display irregularities.
Implementation Method 1
a layer structure of a conductor film, a semiconductor film, and an insulating film of given patterns
Implementation Method 2
portions which do not overlap with the drawing lines in order that the connecting portions can be cut by projecting light energy (e.g., a laser beam) thereto from the outside of a display panel
Data Source
Figure 1
Figure 2
Figure 3A~3E
AI summary
A display panel substrate in which parasitic capacitances are provided to data signal lines and any short which occurs between the data signal line and a conductor film can be corrected, and a display panel having the substrate. A plurality of strip conductors 1262 overlap with drawing lines 121 arranged to transmit data signals to data signal lines 111 with an insulating film 132 sandwiched therebetween, and the plurality of strip conductors 1262 are electrically connected by connecting portions 1263, 1264 and 1265 having portions which do not overlap with the drawing lines.