Liquid Crystal Display Pixel Electrode and Column Spacer Design
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Solution Overview
Problem
Liquid crystal display devices face issues with cracks, high reflectance due to external light, and low contrast ratio, which affect their performance and reliability.
Innovation Solution
The design includes a liquid crystal display device with a specific configuration of pixel electrodes and column spacers, where the column spacer is spaced apart from the edge of the pixel electrode by a certain distance and formed from the same material as the black matrix, reducing the likelihood of cracks and improving contrast ratio by minimizing light reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the column spacer is disposed close to the edge of the pixel electrode, then the manufacturing process is simplified, but cracks occur in the pixel electrode
Solution Approach 1:
The patent introduces an edge portion as an intermediary element between the column spacer and the contact portion. This edge portion acts as a buffer zone that prevents direct contact between the column spacer and the contact portion, thereby eliminating the source of cracks while maintaining the simplified manufacturing process where the column spacer can still be disposed close to the edge region
2Ease of manufacture
If the column spacer is formed from the same material as the black matrix, then the manufacturing process is simplified, but the contrast ratio deteriorates due to increased light reflection
Solution Approach 1:
The patent applies local quality by making the column spacer transparent while keeping the black matrix opaque. This allows the column spacer to have the same material composition and manufacturing process as the black matrix, but with a different optical property (transparency) that eliminates light reflection issues in the specific region where the column spacer is located
3Ease of manufacture
If the pixel electrode structure is simplified, then the manufacturing process is easier, but the contrast ratio decreases due to high reflectance
Solution Approach 1:
The patent applies local quality by making the column spacer transparent while keeping the black matrix opaque. This allows the column spacer to have the same material composition and manufacturing process as the black matrix, but with a different optical property (transparency) that eliminates light reflection issues in the specific region where the column spacer is located
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 configuration effectively prevents cracks and enhances the contrast ratio by reducing light reflection, leading to improved display performance and reliability.
Implementation Method 1
the alignment of liquid crystal molecules in the liquid crystal layer is determined, and the polarization of incident light is controlled
Data Source
AI summary
A liquid crystal display device includes a first substrate; a switching element including a control electrode disposed on the first substrate, one electrode disposed on the control electrode, and another electrode disposed on the control electrode and spaced apart from the one electrode; a contact hole extending to at least a part of the another electrode of the switching element; a pixel electrode including a contact portion disposed on the another electrode of the switching element and overlapping at least a part of the another electrode to which the contact hole extends, and a body portion electrically connected with the contact portion; and a column spacer disposed on the pixel electrode and at least partially overlapping the contact hole.