Display Pixel Repair Using Laser-Shorted Voltage Lines
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Solution Overview
Problem
Display devices often suffer from bright spot defects due to defective pixel circuits, which are more prevalent with increasing size and resolution, causing the entire device to be treated as defective.
Innovation Solution
A display device structure and method that converts bright spots into dark spots by short-circuiting a repair portion of the node connection line with the initialization voltage line using a laser beam, thereby addressing pixel circuit defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the display device size and resolution are increased, then the visual quality is improved, but the possibility of pixel circuit defects and bright spot defects increases
Solution Approach 1:
The node connection line is designed to overlap with the initialization voltage line in advance, creating a pre-configured repair path. When a bright spot defect occurs, this pre-established overlap allows immediate repair by shorting the node connection line to the initialization voltage line, converting the bright spot to a dark spot without requiring additional structural modifications or complex repair procedures.
2Reliability
If a bright spot defect occurs due to defective pixel circuit, then the display device is traditionally treated as defective, but this reduces productivity and yield
Solution Approach 1:
The invention converts the harmful bright spot defect into a beneficial dark spot state by shorting the node connection line to the initialization voltage line. This transforms a defective pixel that continuously emits light into a non-emissive pixel, making the defect imperceptible or acceptable, thereby allowing the display device to be classified as functional and improving production yield.
Solution Approach 2:
The overlapping region between the node connection line and initialization voltage line serves as an intermediary repair mechanism. By utilizing this pre-configured overlap, the repair process becomes simplified to a single shorting operation rather than requiring complex circuit modifications, enabling quick repair and maintaining productivity.
3Reliability
If traditional repair methods are used for bright spot defects, then complex procedures are required, but this increases repair difficulty and time
Solution Approach 1:
The node connection line is pre-configured to overlap with the initialization voltage line during manufacturing, establishing a ready-to-use repair path before defects occur. This preliminary structural arrangement eliminates the need for complex repair procedures, as the repair process simply requires shorting the overlapping lines to convert bright spots to dark spots.
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 approach effectively transforms bright spots into dark spots, improving the productivity and yield of display devices by allowing them to function normally despite defects.
Implementation Method 1
short-circuiting a repair portion of the node connection line with the initialization voltage line using a laser beam
Data Source
AI summary
Provided are a display device in which a bright spot occurring due to a defective pixel circuit may be repaired into a dark spot, and a method of repairing the display device. The display device includes a substrate, a thin-film transistor arranged on the substrate and including a semiconductor layer and a gate electrode overlapping at least a portion of the semiconductor layer, a pixel electrode on the substrate, a node connection line connecting the thin-film transistor and the pixel electrode to each other, and an initialization voltage line arranged on the substrate and extending in a first direction, wherein the node connection line includes a repair portion overlapping the initialization voltage line in a plan view.