Display Substrate Static Dissipative Test Pattern
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Solution Overview
Problem
The existing methods for testing display panels, particularly in the manufacturing process of LCD panels, face challenges due to misconnection issues between test apparatus pins and panel pads, which decrease the credibility and efficiency of gross tests, leading to defects such as open circuits or short circuits caused by static charges.
Innovation Solution
A display substrate with integrated static dissipative parts and test parts that apply specific test signals to the gate and source lines, ensuring precise testing and reducing static charge effects, along with an apparatus and method for testing that utilize signal generators to apply these signals, enhancing the accuracy of defect detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pins of test apparatus make contact with pads of LCD panel to apply test signals, then test signals can be applied to LCD panel, but misconnection between pins and pads decreases credibility of gross test
Solution Approach 1:
The patent introduces a test pattern comprising multiple test signal lines extending from the pad to a test pattern region. This test pattern acts as an intermediary structure that receives test signals through pins and distributes them to multiple lines, ensuring reliable testing even when pin-to-pad contact is not perfectly precise. The multiple lines provide redundancy and ensure signal transmission integrity.
2Reliability
If traditional testing methods are used without static dissipative parts, then manufacturing process is simpler, but static charge causes open circuit or short circuit defects
Solution Approach 1:
The patent extracts the static charge dissipation function as a separate component (static dissipative part) from the main display substrate structure. This dedicated component is specifically designed to dissipate static charges that may cause defects, while the remaining substrate maintains its original simple structure for display functions. This separation allows adding reliability without significantly increasing overall complexity.
Solution Approach 2:
The patent converts the potentially harmful static charge into a beneficial testing opportunity by designing test signal lines that extend into the test pattern region. The static charge effects become detectable through the extended lines, allowing identification and correction of potential issues before final product completion, thereby improving yield.
3Difficulty of detecting and measuring
If test signal lines are extended to test pattern region, then defect detection capability is improved, but manufacturing process becomes more complex
Solution Approach 1:
The patent segments the substrate into distinct functional regions: a pad region for signal input, test signal lines for signal transmission, and a test pattern region for defect detection. This segmentation allows each region to be optimized independently and simplifies the manufacturing process by providing clear guidelines for pattern formation and quality control at each stage.
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
The solution enables more reliable and efficient testing of display panels by reducing errors from static charge misconnections, improving manufacturing yield and credibility, and decreasing manufacturing costs.
Implementation Method 1
A static dissipative part dispersing a static charge applied to a pad part
Data Source
AI summary
A display substrate includes a gate pad part, a source pad part, a first static dissipative part, and a first test part. A gate pad part is formed on one terminal of each of a plurality of gate lines and transfers signals to the gate lines. A source pad part is formed on one terminal of each of a plurality of source lines and transfers signals to the source lines. A first static dissipative part disperses static charge that flows into the source pad part. A first test part receives a first test signal, makes electrical contact with the first static dissipative part, and transfers the first test signal to the source lines through the first static dissipative part. A display apparatus including the display substrate transmits first test signals that are uniformly applied to source lines through a first test part, so defects are easily detected through a gross test.