Array Substrate Gate Drive Layout for Uniform Brightness
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Solution Overview
Problem
Conventional display devices with non-rectangular display screens experience uneven brightness due to differences in the number of pixels per row between special-shaped and non-special-shaped regions, leading to an uneven display effect.
Innovation Solution
An array substrate with specialized gate driving units and lead-out wires, where the width-length ratio and wire widths of transistors and signal lines are adjusted to equalize light emitting currents across different pixel regions, compensating for capacitive and resistive loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a liquid crystal display is manufactured with a small pixel pitch (e.g., 0.8 mm or less) for high definition, then display resolution is improved, but the aperture ratio decreases and manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by creating different regions with different functions: the alignment mark has a specific structure (different from regular pixel electrodes) that enables precise detection and alignment, while the rest of the electrode structure maintains the high-definition pixel pitch. This specialized local structure at the alignment mark region solves the overall alignment precision problem without compromising display resolution.
Solution Approach 2:
The alignment mark serves as an intermediary element between the lower electrode and upper electrode layers. It provides a detectable feature that mediates the alignment process during manufacturing, enabling precise positioning of the upper electrode relative to the lower electrode even when the pixel pitch is very small. This intermediary structure facilitates the alignment process without being part of the active display pixels.
2Illumination intensity
If the aperture ratio is increased to improve light utilization, then display brightness is improved, but the pixel pitch must be increased which reduces display resolution
Solution Approach 1:
The patent resolves this contradiction by moving the alignment detection to a different dimensional approach - using the alignment mark's geometric features (such as extended regions or specific patterns) that can be detected in multiple dimensions during the manufacturing process. This allows precise alignment without requiring larger pixel dimensions, thereby maintaining both high aperture ratio and high display resolution.
3Ease of manufacture
If conventional transparent electrodes (ITO) are used, then manufacturing process is simple, but electrode strength is insufficient leading to breakage during bonding
Solution Approach 1:
The patent employs composite materials by combining multiple electrode layers with different properties: a lower electrode layer (which can be ITO for simplicity) and an upper electrode layer with enhanced mechanical strength. This composite structure maintains the ease of manufacturing the base electrode while adding the necessary strength to prevent breakage during bonding processes. The multi-layer approach allows each layer to contribute its optimal properties to the overall system.
Data Source
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AI summary
The present disclosure relates to an array substrate and a display screen. A corresponding display area on the array substrate includes a special-shaped display region and a non-special-shaped display region, and the array substrate includes a first gate drive unit located in the non-display area and corresponding to pixels in the special-shaped display region, a second gate driving unit located in the non-display area and corresponding to pixels in the non-special-shaped display region. A width-length ratio of a first output transistor of the first gate driving unit is smaller than a width-length ratio of a second output transistor of the second gate driving unit. A width of a first lead-out wire corresponding to the special-shaped display region and a width of a second lead-out wire corresponding to the non-special-shaped display region are respectively adaptively configured to accurately compensate for difference between the special-shaped display region and the non-special-shaped display region, thereby solving technical problem of uneven brightness of displayed image caused by difference in load between the special-shaped display region and the non-special-shaped display region.