Display Device Dummy Pixel Repair Lines
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Solution Overview
Problem
Defective pixels in display devices, such as liquid crystal display devices and organic light-emitting display devices, can occur during manufacturing, leading to reduced yield and display quality, as they may appear as bright or dark points that do not respond to scan and data signals.
Innovation Solution
The display device incorporates a substrate with active and dummy areas, featuring sub-pixels arranged in rows and columns, with initialization power lines extending in the column direction and repair lines in the row direction. The dummy pixels are strategically placed to connect with active pixels via repair lines, allowing for initialization and data signal provision, effectively converting defective pixels into functional ones by utilizing the dummy pixels as repair pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dummy pixels are added to the display device, then defective pixels can be repaired by connecting them to dummy pixels through repair lines, but the device structure becomes more complex and the area occupied increases
Solution Approach 1:
Dummy pixels are designed to serve dual purposes: they function as regular display pixels during normal operation and as repair sources for defective pixels when needed. This multi-functionality allows the same structure to provide both display functionality and repair capability without requiring completely separate repair mechanisms.
Solution Approach 2:
Repair lines act as intermediary connections that can selectively connect defective pixels to dummy pixels. These repair lines serve as mediators that enable the transfer of functionality from dummy pixels to defective pixels when defects are detected, without interfering with normal display operation.
2Reliability
If repair lines are arranged to connect dummy pixels and active pixels, then defective pixels can be repaired, but the wiring complexity and manufacturing difficulty increase
Solution Approach 1:
Dummy pixels and repair lines are pre-configured during manufacturing before any defects occur. The repair infrastructure is built in advance, allowing rapid response to defects without requiring complex post-manufacturing analysis or customization for each defective pixel.
Solution Approach 2:
The display panel is divided into active pixels and dummy pixels with dedicated repair lines connecting them. This segmentation allows independent optimization of each component and simplifies the repair process by creating discrete, manageable connection paths rather than requiring complex global reconfiguration.
3Reliability
If initialization power lines are extended to cover all sub-pixels including dummy pixels, then proper initialization voltage is provided to ensure correct operation, but the power line complexity and manufacturing precision requirements increase
Solution Approach 1:
Dummy pixels are designed with the same initialization power line connections and voltage requirements as active pixels. This homogeneity ensures that the same power line infrastructure can serve both pixel types without requiring different voltage levels or specialized connection methods, simplifying the overall power distribution system.
Data Source
AI summary
A display device includes a substrate including an active area and a dummy area, and including a plurality of sub-pixels arranged in m rows and n columns, first initialization power lines which provide a first initialization voltage to sub-pixels of the plurality of sub-pixels and extending in a column direction, second initialization power lines which provide a second initialization voltage to sub-pixels of the plurality of sub-pixels and extending in the column direction, and repair lines extending in a row direction. Sub-pixels of the dummy area are arranged in an outermost column of the n columns, the repair lines are arranged so as to connect the sub-pixels of the dummy area and sub-pixels of the active area among the plurality of sub-pixels, respectively, and m and n are natural numbers.