Driving Substrate Dielectric Thickness Control for Display Uniformity
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Solution Overview
Problem
Conventional bezel-less mobile phone screens with slotting designs exhibit non-uniform display brightness due to differences in capacitive loads between specially-shaped and normal display areas, causing disparities in RC delay and pixel scanning signal delivery.
Innovation Solution
A method of manufacturing driving substrates with specially-shaped and normal display areas, where the first dielectric layer in the specially-shaped area and the second dielectric layer in the normal area are formed on the same plane, with controlled thickness values using a film thickness control model to adjust the capacitive loads, ensuring equal brightness across both areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a slotting design is used to achieve bezel-less display, then screen-to-body ratio is improved, but display uniformity deteriorates due to capacitive load differences
Solution Approach 1:
The patent applies local quality by differentiating the dielectric layer thickness between the slotting area and normal display area. Specifically, the first dielectric layer in the slotting area has a first thickness while the second dielectric layer in the normal area has a second thickness, creating locally adapted electrical characteristics that compensate for the capacitive load imbalance caused by the slotting design.
Solution Approach 2:
The patent changes the physical parameter of dielectric layer thickness to adjust capacitive load. By controlling the thickness parameters of the dielectric layers (first thickness for slotting area, second thickness for normal area), the patent modifies the electrical characteristics to achieve uniform display performance across different display regions.
2Ease of manufacture
If uniform dielectric layer thickness is used, then manufacturing process is simplified, but capacitive load imbalance occurs between slotting and normal areas
Solution Approach 1:
The patent implements local quality by creating different dielectric layer thicknesses in different spatial regions. The first dielectric layer covers the slotting area with a first thickness, while the second dielectric layer covers the normal display area with a second thickness, ensuring each region has optimized electrical characteristics for its specific function.
Solution Approach 2:
The patent segments the dielectric layer structure into distinct first and second dielectric layers with different thicknesses. This segmentation allows independent optimization of capacitive characteristics for the slotting area versus the normal display area, resolving the capacitive load imbalance while maintaining manufacturability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method ensures equal capacitive loads for signal lines across both display areas, thereby achieving uniform display brightness by increasing the capacitive load of the first storage capacitor, thus compensating for the differences in pixel driving signal loads.
Implementation Method 1
depositing the first dielectric layer and the second dielectric layer on a surface of the first metal layer
Implementation Method 2
dielectric gas flow rate and a film thickness growth rate
Data Source
AI summary
Exemplary embodiments of the present disclosure provide methods of manufacturing driving substrates, including: obtaining a first thickness value of the first dielectric layer based on a difference between loads of all first storage capacitors of a specially-shaped display driving area and loads of all second storage capacitors of a normal display driving area; providing a substrate and depositing a first metal layer on a surface of the substrate; controlling a film forming process parameter by using a film thickness control model, and depositing the first dielectric layer and the second dielectric layer on a surface of the first metal layer, so that a thickness of the first dielectric layer reaches a first thickness value and a thickness of the second dielectric layer reaches a second thickness value larger than the first thickness value. A driving substrate and a display apparatus are also disclosed.