Display Mask Plate Compensation Shielding for Narrow-Bezel Wire Integrity
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Solution Overview
Problem
The challenge of thin or broken wires in display substrates due to narrow line distances during the production process, leading to reduced product yield and display defects.
Innovation Solution
A mask plate design with light shielding portions and compensation light-shielding portions to control exposure intensity, ensuring proper formation of signal line leads by blocking excessive light exposure and maintaining line width consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the line distance size of peripheral wires is decreased to meet narrow bezel demand, then the bezel width is reduced, but the wires become too thin or broken during production
Solution Approach 1:
The patent applies local quality by providing compensation light-shielding portions at specific locations where wire breaking is prone to occur, rather than uniformly increasing shielding across the entire mask plate. This targeted approach strengthens vulnerable areas while maintaining narrow line distances elsewhere, resolving the contradiction between narrow bezel and wire integrity.
Solution Approach 2:
The compensation light-shielding portions are designed to prevent wire breaking before it occurs by blocking excessive light exposure in advance during the photoresist formation process. This preliminary protective action counteracts the tendency of thin wires to break during subsequent production steps, enabling narrow bezel design without sacrificing reliability.
2Area of stationary object
If the line distance size of peripheral wires is decreased, then the bezel width is reduced, but the product yield decreases due to broken wires
Solution Approach 1:
By concentrating compensation light-shielding portions at specific high-risk locations rather than uniformly across the mask plate, the patent enables narrow bezel design while maintaining high product yield. This localized approach prevents broken wires in critical areas without requiring overall increase in shielding that would compromise yield.
3Length of stationary object
If the light shielding portions are made closer together to reduce line distance, then the bezel width is reduced, but the exposure intensity becomes excessive causing wire breaking
Solution Approach 1:
The patent addresses excessive exposure intensity by introducing compensation light-shielding portions at specific locations where intensity is too high, rather than uniformly increasing shielding. This allows maintenance of narrow line distances while locally reducing exposure intensity to prevent wire breaking.
Solution Approach 2:
The patent converts the harmful effect of excessive light exposure into a beneficial design feature by strategically placing compensation light-shielding portions. These portions transform the over-exposure problem into an opportunity to precisely control light distribution, enabling narrow line distances without wire breaking.
4Length of stationary object
If the line width of signal line leads is reduced to achieve narrow bezel, then the bezel width is reduced, but the wires become too thin and break during production
Solution Approach 1:
The patent maintains manufacturing precision by providing compensation light-shielding portions at specific locations where line width variation and breaking are prone to occur. This localized compensation ensures consistent line width throughout production while allowing narrow bezel design.
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
Improves product yield by preventing thin or broken signal line leads, ensuring consistent line widths and reducing defects in display substrates.
Implementation Method 1
a light shielding layer provided on the first base substrate; and a plurality of light shielding portions and at least one compensation light-shielding portion provided in the light shielding layer
Data Source
AI summary
Provided are a mask plate, a display substrate, a display panel and a display device. In the mask plate, an orthographic projection of at least one compensation light-shielding portion on a first base substrate is located between those of two adjacent light shielding portions. An orthographic projection of at least one compensation light-shielding portion in a second direction overlaps at least partially with that of a first width gradient portion of an ith light shielding portion in two adjacent light shielding portions, and an orthographic projection of the compensation light-shielding portion in a first direction overlaps at least partially with an orthographic projection of a first corner portion of a jth light shielding portion in the two adjacent light shielding portions. A corner of the first corner portion of the ith light shielding portion is oriented toward the jth light shielding portion.