Segmented Voltage Wiring for Uniform LED Display Alignment
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Solution Overview
Problem
Existing display devices face challenges in uniformly aligning light-emitting elements across large display areas due to declining electric field strength as distance from alignment pads increases, leading to potential heat generation and image quality issues.
Innovation Solution
A display device design featuring separate first and second voltage wirings in non-display areas, with a switching transistor controlling power supply voltage distribution, ensures uniform alignment signals are transmitted across different display areas, maintaining electric field strength and preventing heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single voltage wiring is used to supply power to all pixels across the display area, then the device complexity is reduced, but the electric field strength declines with distance from the alignment pad, leading to non-uniform alignment and potential heat generation
Solution Approach 1:
The voltage wiring is divided into multiple separate wirings (first voltage wiring and second voltage wiring) that extend to different regions of the display area. Each wiring independently supplies power to pixels in its respective region, ensuring uniform electric field strength across the entire display area without requiring a single complex wiring structure.
2Manufacturing precision
If the voltage wiring extends across the entire display area to provide uniform alignment signals, then the alignment precision is improved, but the wiring length increases causing greater power loss and heat generation
Solution Approach 1:
The display area is divided into multiple regions, each served by a separate voltage wiring. This segmentation reduces the length of each individual wiring while ensuring comprehensive coverage, thereby minimizing power loss and heat generation in each wiring segment.
Solution Approach 2:
A switching transistor is introduced as an intermediary component to control the power supply from multiple voltage wirings to the pixels. This allows selective activation of different wirings based on the alignment stage, optimizing power distribution and reducing energy loss.
3Ease of manufacture
If alignment signals are transmitted to all pixels simultaneously, then the manufacturing process is simplified, but the electric field strength becomes non-uniform across different areas, affecting alignment precision
Solution Approach 1:
The alignment process is segmented into multiple stages, with each voltage wiring activating in sequence to serve different regions of the display area. This ensures that alignment signals are transmitted uniformly to each region at the appropriate time, maintaining high alignment precision across the entire display.
Solution Approach 2:
The voltage wirings are dynamically controlled through switching transistors that activate different wirings at different times during the alignment process. This dynamic control ensures uniform electric field distribution across the display area while maintaining process efficiency.
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 allows for uniform alignment and power distribution to light-emitting elements, enhancing image quality and preventing heat issues across the entire display area, even with a large number of pixels.
Implementation Method 1
maintaining electric field strength
Data Source
AI summary
A display device comprises a display area, a non-display area surrounding the display area, pixels disposed in the display area of the substrate, each of the pixels including a first electrode, a second electrode, and light-emitting elements electrically connected to the first electrode and the second electrode, and a first voltage wiring disposed in the display area and the non-display area, the first voltage wiring electrically connected to at least some of the pixels. The first voltage wiring includes a first separation wiring disposed in the non-display area, and a second separation wiring disposed in the non-display area and spaced apart from the first separation wiring.