Display Substrate Electrode Layout for Profiled Cutting
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Solution Overview
Problem
The integration of touch control functionality in AMOLED displays leads to increased lengths of unit test electrodes, which complicates profiled cutting in the unit display panel stage, reducing productivity due to the need for module device modifications.
Innovation Solution
A display substrate design where the first and second unit test electrodes are placed on separate metal layers, allowing profiled cutting to occur in the unit display panel stage without separating the unit test electrodes, thereby maintaining productivity in the module stage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch control functionality is integrated in AMOLED displays, then functionality is improved, but unit test electrode length increases causing profiled cutting complications
Solution Approach 1:
The patent divides the unit test electrode into two separate electrodes located on different metal layers (first and second metal layers). This segmentation allows each electrode to be independently positioned and connected, reducing the overall effective length that would otherwise be cut during profiled cutting operations.
Solution Approach 2:
The patent transitions from a single-plane electrode design to a multi-layer design by placing unit test electrodes on separate metal layers (first and second metal layers) with insulating layers between them. This dimensional change in the z-direction (vertical stacking) allows the electrodes to maintain electrical connection while reducing their horizontal span, enabling successful profiled cutting in the unit display panel stage.
2Area of stationary object
If unit test electrode length increases, then touch control coverage is improved, but profiled cutting becomes complicated reducing productivity
Solution Approach 1:
By segmenting the unit test electrode into two separate electrodes on different metal layers, the patent maintains comprehensive touch control coverage through extended signal lines while reducing the critical cutting length. Each segmented electrode can be independently managed during the cutting process, preventing cutting complications and maintaining high productivity.
Solution Approach 2:
The patent uses vertical stacking of metal layers to provide additional space for electrode routing. This allows signal lines to extend horizontally for comprehensive coverage while the vertical separation prevents the electrodes from being cut apart, maintaining both coverage area and cutting efficiency.
3Ease of manufacture
If unit test electrodes are on the same layer, then manufacturing is simpler, but they get cut apart during profiled cutting requiring module stage modifications
Solution Approach 1:
The patent places unit test electrodes on separate metal layers (first and second metal layers) with insulating layers between them. This vertical separation in the z-dimension prevents the electrodes from being cut apart during profiled cutting, maintaining electrode integrity while still allowing standard manufacturing processes to form the multi-layer structure.
Solution Approach 2:
The patent introduces insulating layers as intermediary elements between the first and second metal layers containing unit test electrodes. These insulating layers act as mediators that electrically isolate the electrodes on different layers while allowing the structure to maintain mechanical integrity during cutting operations, preventing the electrodes from being cut apart.
4Reliability
If profiled cutting is moved to module stage, then electrode integrity is maintained, but productivity decreases due to additional processing stage
Solution Approach 1:
The patent implements a preliminary design configuration where unit test electrodes are placed on separate metal layers before the profiled cutting operation. This preliminary arrangement ensures that the electrodes will not be cut apart during the cutting process, allowing profiled cutting to be successfully performed in the unit display panel stage without needing to wait for the module stage, thereby maintaining high productivity.
Data Source
AI summary
A display substrate and a preparation method therefor, and a display device, the display substrate including a base as well as a display area, a binding needle area, a first unit test electrode and a second unit test electrode which are on one side of the base. The binding needle area is on one side of the display area; the first unit test electrode is on the side, away from the display area, of the binding needle area; the second unit test electrode is on the side, away from the binding needle area, of the first unit test electrode; the display substrate comprises a first metal layer, a second metal layer and an insulating layer between the first metal layer and the second metal layer; the first unit test electrode is on the first metal layer, and the second unit test electrode is on the second metal layer.