Display Device Active Layer Area Variation for Current Distribution
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Solution Overview
Problem
Display devices with cameras under substrates face challenges in managing different resolutions between transmittance and drive regions, leading to potential overcurrent issues that shorten the lifespan of low-resolution regions due to structural differences.
Innovation Solution
The display device is structured with a substrate divided into regions of different resolutions, where the active layer of driving thin film transistors in low-resolution areas is enlarged to distribute current effectively, preventing overcurrent and ensuring stable operation by using the same driver IC for both regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same driver IC is used for both high-resolution and low-resolution regions, then device complexity is reduced and manufacturing cost is lowered, but current density becomes uneven leading to overcurrent in low-resolution regions which shortens lifespan
Solution Approach 1:
The patent applies local quality by making the active layer area vary according to the specific requirements of different display regions. The active layer area is increased in low-resolution regions (such as the camera hole region) and decreased in high-resolution regions, allowing each region to have the appropriate current handling capacity for its function while using the same driver IC for both regions.
2Reliability
If the active layer area is increased in low-resolution regions, then current density is reduced preventing overcurrent and extending lifespan, but the structural difference between regions increases complicating manufacturing
Solution Approach 1:
The patent applies parameter changes by modifying the active layer area parameter according to the display region type. The active layer area is set to a first area for high-resolution regions and a second area (larger than the first) for low-resolution regions, allowing optimization of current density for each region's specific requirements while maintaining manufacturability through a systematic approach to structural variation.
3Ease of manufacture
If uniform active layer area is used across all regions, then manufacturing is simplified, but current density becomes uneven causing overcurrent in low-resolution regions
Solution Approach 1:
The patent applies local quality by making the active layer area vary according to the specific requirements of different display regions. The active layer area is increased in low-resolution regions (such as the camera hole region) and decreased in high-resolution regions, allowing each region to have the appropriate current handling capacity for its function while using the same driver IC for both regions.
4Reliability
If different driver ICs are used for high-resolution and low-resolution regions, then current distribution is optimized for each region, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent applies universality by designing a single driver IC that can drive both high-resolution and low-resolution regions. This is achieved by optimizing the active layer areas to ensure that the same driver IC can provide appropriate current density for different region types, eliminating the need for separate driver ICs and reducing device complexity while maintaining reliable current distribution.
Data Source
AI summary
A display device includes a substrate having a first region and a second region, a first array unit in the first region and including at least one subpixel having a first light emitting part, and a second array unit in the second region. The second array unit can include a plurality of subpixels, where each of the plurality of subpixels can include a second light emitting part having a smaller area than an area of the first light emitting part. A first driving thin film transistor of at least one subpixel in the first array unit and a second driving thin film transistor of each of the subpixels of the second array unit can include a first active layer and a second active layer, respectively.