Mesh Initialization Voltage Lines for Uniform Display Luminance
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Solution Overview
Problem
Display devices experience luminance deviations due to load differences between wires at the notch portion and other areas, leading to uneven voltage transmission and pinkish display images.
Innovation Solution
The display device incorporates a second initialization voltage line with a mesh structure, including horizontal and vertical portions, to evenly distribute voltage across different areas, minimizing load differences and ensuring uniform luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional initialization voltage line structure is used, then the device complexity is low, but luminance uniformity deteriorates due to load differences between wires at the notch portion and other areas
Solution Approach 1:
The second initialization voltage line is divided into multiple segments including horizontal portions and vertical portions. The vertical portions are disposed between pixels at regular intervals (e.g., one vertical portion for every four pixels) to segment the voltage distribution network, thereby reducing load differences and improving luminance uniformity across different areas of the display device.
2Manufacturing precision
If the second initialization voltage line includes vertical portions between pixels, then luminance uniformity is improved, but the area occupied by voltage lines increases
Solution Approach 1:
Vertical portions of the second initialization voltage line are selectively disposed between pixels at specific intervals rather than continuously across the entire display area. This local quality approach ensures that voltage distribution is improved only where needed (at regular intervals) while minimizing the total area occupied by the voltage line structure.
3Ease of manufacture
If wires at the notch portion have different load characteristics, then device manufacturing is simplified, but luminance deviation occurs between notch area and other areas
Solution Approach 1:
The mesh-shaped second initialization voltage line structure with horizontal and vertical portions creates a more uniform voltage distribution across the display device, including the notch area. By providing multiple voltage transmission paths and reducing load differences, the structure achieves equipotential conditions that eliminate luminance deviations between different areas.
Data Source
AI summary
Provided is a display device which comprises a substrate, a plurality of pixels disposed on the substrate, a first initialization voltage line disposed on the substrate along a first direction, and a second initialization voltage line disposed on a different layer from the first initialization voltage line, wherein the second initialization voltage line may include a horizontal portion disposed along the first direction and a vertical portion disposed along a second direction crossing the first direction, and the vertical portion may be disposed between a plurality of pixels adjacent to each other in the first direction.