Display Panel Inspection Using Resistors for Signal Differentiation
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Solution Overview
Problem
The increasing complexity of flat panel display circuits, with narrower line widths and intervals, makes it difficult for existing inspection methods to accurately measure electrical changes in individual circuit lines, leading to inaccurate electrical inspections.
Innovation Solution
The introduction of resistors to differentiate the electrical properties of adjacent signal lines, allowing for precise measurement of each signal line's status by inputting distinct inspecting signals and detecting their electrical changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the interval between circuit lines is reduced to increase display resolution, then the display panel resolution is improved, but the inspection accuracy deteriorates because the inspecting apparatus cannot accurately measure the electrical change of a single circuit line
Solution Approach 1:
The invention divides the inspection process into separate measurements for adjacent signal lines by introducing resistors that create distinct electrical characteristics for each line. Instead of attempting to measure all lines simultaneously, the system segments the measurement by applying inspection signals to one line at a time while using the resistor to isolate and differentiate the electrical response of each individual line.
Solution Approach 2:
The resistor serves as an intermediary element between adjacent signal lines during inspection. By connecting the resistor to a signal line, it creates a unique electrical path and measurable voltage drop that distinguishes the target line from its neighbors, enabling the inspection apparatus to accurately measure electrical changes of a single circuit line even when lines are closely spaced.
2Measurement precision
If resistors are introduced to differentiate electrical properties of adjacent signal lines, then the inspection accuracy is improved, but the device complexity increases
Solution Approach 1:
The resistor is introduced only at specific locations where inspection is required, rather than throughout the entire circuit. This local modification differentiates the electrical properties of adjacent signal lines only at the inspection point, minimizing the overall impact on circuit complexity while achieving the goal of improved measurement precision.
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 enables accurate detection of open-circuit or short-circuit defects, improving inspection accuracy and increasing product yield by ensuring significant detecting signals are obtained despite close line intervals.
Implementation Method 1
an interval between the first signal line and the second signal line is smaller than 60 μm, and a difference between a first resistance of the first signal line and a second resistance of the second signal line is ranged from 30 ohm to 30000 ohm
Data Source
AI summary
A display panel and a method for inspecting thereof are provided. The display panel includes a first signal circuit, a second signal circuit and a plurality of first resistor. The first signal circuit includes a plurality of first signal lines which disposes in parallel along a first direction and electrically connects to one another. The second signal circuit includes a plurality of second signal lines disposing in parallel along the first direction, and the second signal lines and the first signal lines are alternately disposed in parallel. Each of second signal lines is connected to at least a first resistor. The interval between the first signal line and the second signal line is smaller than 60 μm and the difference between the resistances of the first signal line and the second signal line is ranged form 300 ohm to 30000 ohm.