Display Device Pixel Driver Nesting for Narrow Bezel
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Solution Overview
Problem
Current display devices have a limited ability to reduce the area of the non-display region, which restricts the expansion of the display region, leading to inefficient use of space and potential differences in grayscale and luminance between pixels.
Innovation Solution
The display device is designed with a second display region that includes scan and light-emitting drivers, allowing these drivers to apply signals to both first and second pixels, thereby increasing the display area while minimizing the non-display region. This is achieved by strategically placing second pixel drivers and light-emitting devices between adjacent scan and light-emitting stages, ensuring minimal distance deviation and uniformity in connection lines, which reduces grayscale and luminance differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the non-display region area is reduced to increase display region area, then the display area is increased, but the pixel drivers and light-emitting devices cannot be properly disposed leading to grayscale and luminance differences
Solution Approach 1:
The patent utilizes the third dimension (vertical stacking) by disposing pixel drivers and light-emitting devices at different heights through multiple planarization films and electrode layers. This allows both components to coexist in the limited planar space without overlapping, enabling reduced non-display region area while maintaining proper component disposal and uniform display performance.
Solution Approach 2:
The patent embeds the pixel driver within the same pixel structure as the light-emitting device, with the driver disposed between scan stages and the light-emitting device disposed on planarization films above the driver. This nested arrangement allows both components to share the same spatial footprint, maximizing display region area while ensuring proper component integration and uniformity.
2Area of moving object
If second pixel drivers are disposed between scan stages to increase display area, then the display region area is increased, but the connection between pixel drivers and light-emitting devices becomes more complex
Solution Approach 1:
The patent resolves connection complexity by utilizing vertical stacking with multiple planarization films. Connection lines are disposed on different vertical levels (first planarization film for data lines, second planarization film for light-emitting device connections), allowing straightforward routing without excessive planar crossings or complex three-dimensional interconnections.
Solution Approach 2:
The patent introduces planarization films as intermediary layers that facilitate clean separation and organization of connection lines. These films provide dedicated routing paths for different signal types (data lines versus light-emitting device connections), acting as mediators that simplify the overall connection architecture despite the dense component arrangement.
3Area of stationary object
If pixels are arranged in the second display region with scan drivers, then the non-display region area is reduced, but the distance deviation between pixel drivers and light-emitting devices increases
Solution Approach 1:
The patent embeds the pixel driver and light-emitting device within the same pixel structure, with the driver disposed between scan stages and the light-emitting device disposed on planarization films directly above the driver. This nested configuration minimizes the distance between components while allowing both to be disposed in the second display region, thereby reducing non-display region area without excessive distance deviation.
Solution Approach 2:
The patent applies different disposal strategies for different components within the same region: pixel drivers are disposed between scan stages at a lower vertical level, while light-emitting devices are disposed on planarization films at a higher vertical level. This localized differentiation allows optimal distance control for each component pair while maintaining overall compactness and reducing non-display region area.
Data Source
AI summary
Embodiments of the present disclosure relates to a display device. According to an embodiment of the disclosure, a display device includes a substrate including a first display region and a second display region surrounding the first display region, a first pixel disposed in the first display region, a second pixel disposed in the second display region, and scan stages which are disposed in the second display region and apply scan signals to the first pixel and the second pixel. The first pixel includes a first pixel driver including a first pixel transistor and a first pixel light-emitting device connected to the first pixel driver. The second pixel includes a second pixel driver including a second pixel transistor and a second pixel light-emitting device connected to the second pixel driver. The second pixel driver is disposed between scan stages adjacent to each other along a first direction.