Display Module Connecting Bars Inspection via Auxiliary Lines
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Solution Overview
Problem
The COG type display device module faces challenges in forming connecting bars between scan lines and data lines due to spatial limitations, making it difficult to perform lighting inspection and aging processes without damaging the components, and requiring costly abandonment of the device-driving unit if defects are detected.
Innovation Solution
The method involves forming auxiliary data lines and scan lines with connecting bars on a mother substrate outside the scribe line, allowing for easy inspection and testing before mounting the device-driving unit, and using a connecting means like a film to connect the device-driving unit to the pixel circuit section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If connecting bars are formed between scan lines and data lines in COG type display device module, then electrical connection is achieved, but spatial limitations prevent proper formation and inspection
Solution Approach 1:
The invention divides the connection structure into two parts: connecting bars formed outside the scribe line for electrical connection, and auxiliary lines formed inside the scribe line for inspection. This segmentation allows the connecting bars to be properly formed without spatial constraints while enabling easy inspection through auxiliary lines that extend into the pixel circuit area.
Solution Approach 2:
The auxiliary lines act as intermediaries between the connecting bars and the pixel circuit sections. They extend from the pixel circuit area to the connecting bars, enabling inspection signals to reach the connecting bars without requiring direct access to the tightly spaced scan lines and data lines.
2Ease of manufacture
If device-driving unit is mounted directly on substrate (COG type), then manufacturing process is simplified, but spatial limitations prevent connecting bar formation
Solution Approach 1:
The invention resolves the spatial conflict by utilizing the area outside the scribe line, which is typically wasted space, to form the connecting bars. This effectively adds another dimension to the layout, allowing connecting bars to be formed in the margin area rather than competing for space within the pixel circuit area.
3Reliability
If inspection is performed before mounting device-driving unit, then defects can be detected early, but connecting bars cannot be properly accessed
Solution Approach 1:
The auxiliary lines are formed in advance during the substrate manufacturing process, before the device-driving unit is mounted. This preliminary action ensures that inspection pathways are already in place, allowing early defect detection of the connecting bars and scan lines without requiring subsequent modifications after mounting.
4Ease of operation
If connecting bars are formed outside scribe line, then inspection is enabled, but additional manufacturing steps are required
Solution Approach 1:
The formation of auxiliary lines is merged with the existing manufacturing processes for forming scan lines and data lines. Both the auxiliary lines and the main conductive lines are formed simultaneously using the same patterning and deposition steps, eliminating the need for separate inspection-specific manufacturing steps.
Data Source
AI summary
The display device module according to the present invention comprises a pixel circuit section including at least one light emitting area, each light emitting area being formed on an overlying area of a first electrode and a second electrode on a substrate; at least one first line connected to a first end portion of the first electrode; at least one first auxiliary line to a second end portion of the first electrode; at least one second auxiliary line having a connecting bar formed at one end thereof; at least one second line connected to the second electrode; and at least one dummy line having a connecting bar formed at one end thereof, the dummy line being disposed not to contact with the pixel circuit section. The display device module of the present invention further comprises a device-driving unit mounted on a mounting area adjacent to the pixel circuit section, and connected electrically to the first and second lines, or a connecting means mounted on a mounting area adjacent to the pixel circuit section and connecting an exterior device-driving unit and the pixel circuit section. The above connecting means is a film on which a device-driving unit is mounted, wherein the film is connected to the pixel circuit section via the first and second lines.