Display Substrate Supporting Layer for Distance Measurement Stress
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Solution Overview
Problem
In the manufacturing of thin film transistor liquid crystal displays (TFT-LCDs), the proximity exposure method requires accurate measurement of the distance between the mask plate and the glass substrate, but existing methods lead to stress concentration and distortion due to segment differences between the distance measuring window and the substrate, causing non-uniformity and local yellowness in the display.
Innovation Solution
A display substrate with a supporting layer in the peripheral area of the distance measuring region, where the supporting layer extends to match the thickness and pattern of the sub-substrate layers, preventing segment differences and stress concentration during alignment and assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a distance measuring window is provided on the mask plate for distance measurement, then the distance between mask plate and glass substrate can be measured, but large blank regions are created on the color filter substrate causing segment differences and stress concentration
Solution Approach 1:
A supporting layer is introduced as an intermediary element in the peripheral area of the distance measuring region. This supporting layer compensates for the structural deficiency caused by the blank region, providing mechanical support and preventing stress concentration without interfering with the distance measurement function.
Solution Approach 2:
The supporting layer is selectively applied only in the peripheral area surrounding the distance measuring region, not across the entire substrate. This localized approach maintains the necessary structural support where blank regions exist while preserving the functional areas for display and measurement.
2Reliability
If the peripheral area of distance measuring region is shielded during exposure, then photoresist curing is prevented, but incomplete exposure occurs at border areas causing debris contamination
Solution Approach 1:
The supporting layer is specifically positioned in the peripheral area of the distance measuring region, creating a local structural enhancement that does not interfere with the exposure process. This localized structure allows proper exposure of functional areas while providing necessary support in the measurement region.
3Measurement precision
If large blank regions exist near distance measuring windows, then distance measurement is enabled, but stress concentration occurs during alignment and assembly causing distortion and cell thickness abnormality
Solution Approach 1:
The supporting layer acts as a mediator between the blank region and the functional substrate areas. It distributes mechanical stress evenly during alignment and assembly processes, preventing the stress concentration that would otherwise cause distortion and cell thickness variations while allowing the distance measuring window to function.
Solution Approach 2:
The supporting layer is provided in advance in the peripheral area to prevent stress concentration before alignment and assembly operations occur. This preemptive structural reinforcement cushions against the stress that will be applied during subsequent manufacturing steps.
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
This solution avoids stress concentration and distortion, ensuring uniform cell thickness and preventing local yellowness in the display panel by maintaining the integrity of the distance measuring region and substrate alignment.
Implementation Method 1
the light beam reflected by the mirror 63 passes through the distance measuring window 641 of the mask plate 64 to be incident on the A1 point on the upper surface of the glass substrate 65
Implementation Method 2
the linear sensor 66 receives intensity information of a light beam refracted from the A point on the lower surface of the distance measuring window 641 of the mask plate 64
Data Source
AI summary
The present invention provides a display substrate and a manufacturing method thereof and a display panel. The display substrate comprises a plurality of sub-substrates, distance measuring regions are provided on a base in space regions between the sub-substrates, the distance measuring region is configured to measure a distance between a mask plate and the base before forming each layer in the sub-substrates by using an exposure process, wherein a peripheral area of the distance measuring region is provided therein with a supporting layer on the base, the peripheral area is located in the space region and around the distance measuring region. There is no large segment difference between the peripheral area of the distance measuring region and the region, where the sub-substrate is located, of the display substrate, so that remarkable stress concentration cannot occur when the display substrate is subsequently aligned and assembled with other substrate.