TFT-LCD Spacer System for Liquid Crystal Redundancy
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Solution Overview
Problem
Temperature variations cause liquid crystal cells in TFT-LCD displays to experience gravity display brightness mura due to changes in liquid crystal volume, leading to issues with vacuum bubbles and reduced redundancy.
Innovation Solution
Incorporating a spacer system with a main spacer and sub-spacers on the display panel, where the sub-spacers are fixed into grooves on the substrate, increasing the segment gap between them to maintain liquid crystal redundancy and alleviate temperature-induced brightness issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the liquid crystal cell uses a single main spacer to maintain the gap, then the manufacturing process is simple, but the liquid crystal redundancy is insufficient leading to gravity display brightness mura under temperature variation
Solution Approach 1:
The spacer system is segmented into two functional types: main spacers that maintain the liquid crystal cell gap under normal conditions, and sub-spacers positioned in grooves that provide additional support when external forces are applied. This segmentation allows the system to maintain adequate liquid crystal redundancy across varying temperature conditions without requiring an overly complex single-structure solution.
Solution Approach 2:
Different regions of the spacer system have different functions and heights. The main spacers have a first height optimized for normal gap maintenance, while sub-spacers have a second height (lower than the first) and are positioned in grooves to provide localized support when needed. This local differentiation optimizes both gap maintenance and temperature compensation functions.
2Reliability
If grooves are formed on the substrate to accommodate sub-spacers, then liquid crystal redundancy is increased, but the manufacturing process complexity increases
Solution Approach 1:
The grooves are formed on the substrate before the spacer formation process. This preliminary action allows the sub-spacers to be naturally positioned and fixed in the grooves during subsequent manufacturing steps, simplifying the overall assembly process despite the additional groove formation step.
Solution Approach 2:
The grooves act as an intermediary structure that facilitates the positioning and fixation of sub-spacers. By providing a physical recess in the substrate, the grooves enable precise placement of sub-spacers without requiring complex alignment processes or additional fixation mechanisms.
3Quantity of substance
If the segment gap between main spacer and sub-spacers is increased, then liquid crystal redundancy is improved, but the device complexity increases
Solution Approach 1:
The solution transitions from a single-layer spacer configuration to a multi-level vertical structure. Main spacers and sub-spacers are arranged at different heights (first height and second height respectively), creating a two-dimensional spacer configuration that increases liquid crystal redundancy without requiring horizontal expansion or complex lateral arrangements.
Data Source
AI summary
This application discloses a display panel, a mask for manufacturing same, and a display device. The display panel includes a first substrate, a second substrate, a liquid crystal layer, a plurality of grooves, and a spacer. The second substrate and the first substrate are arranged oppositely. The liquid crystal layer is formed between the first substrate and the second substrate. The plurality of grooves are provided on the first substrate and depressed from the surface of the first substrate. The spacer is formed on the first substrate and arranged between the first substrate and the second substrate. The spacer includes a main spacer and sub-spacers, the main spacer being higher than the sub-spacers, and the sub-spacers being located inside the grooves.