Display Panel Transistor Layout for Splicing-Gap Brightness Uniformity
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Solution Overview
Problem
Liquid crystal displays with Mini LED backlight modules experience dark zones due to nonuniform backlighting, resulting in reduced display quality, as light is not reflected back in splicing-gap regions between adjacent lamp panels.
Innovation Solution
A display panel design with distinct first and second regions, featuring first and second driving transistors with specific width and spacing ratios, and a corresponding substrate assembly configuration to enhance light transmittance and uniformity across the panel, including a second substrate assembly with common electrodes to adjust electric fields and compensate for light intensity differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple lamp panels are spliced to form a large-sized Mini LED backlight module, then the backlight module can support large-sized display panels, but splicing-gap regions appear between adjacent lamp panels causing dark zones and nonuniform brightness
Solution Approach 1:
The patent applies local quality by making driving transistors in the second region (corresponding to splicing-gap areas) have different structural parameters than those in the first region. Specifically, transistors in the second region have larger width-to-spacing ratios, which increases their transmittance to compensate for the reduced backlight intensity in splicing-gap regions, thereby achieving uniform overall brightness across the display panel.
2Illumination intensity
If driving transistors with larger width-to-spacing ratios are used in splicing-gap regions, then transmittance and brightness are improved in those regions, but transistor size and spacing variations increase manufacturing complexity
Solution Approach 1:
The patent segments the display panel into two distinct regions: a first region corresponding to lamp panel areas and a second region corresponding to splicing-gap areas. This segmentation allows different transistor designs to be applied to different regions, optimizing brightness compensation where needed while maintaining standard designs in other areas, thus balancing performance improvement with manufacturing feasibility.
3Illumination intensity
If additional structures or materials are added to compensate for splicing-gap dark zones, then brightness uniformity is improved, but manufacturing cost and process complexity increase
Solution Approach 1:
The patent employs self-service by utilizing the existing driving transistor structures to perform dual functions: their primary function of driving liquid crystal molecules and their secondary function of compensating for brightness nonuniformity in splicing-gap regions. By adjusting transistor parameters (width and spacing) in the second region, the existing transistors automatically provide the needed optical compensation without requiring additional components, materials, or manufacturing steps.
Data Source
AI summary
A display panel is provided in the disclosure. The display panel includes at least one first region and at least one second region. The display panel includes a first substrate assembly. The first substrate assembly includes multiple first driving transistors located in the at least one first region and multiple second driving transistors located in the at least one second region. A first source or a first drain of the first driving transistor has a first width, and the first source and the first drain are spaced apart by a first spacing. A second source or a second drain of the second driving transistor has a second width, and the second source and the second drain are spaced apart by a second spacing. A ratio of the second width to the second spacing is greater than a ratio of the first width to the first spacing.