LCD Frame Region Reflectance-Reducing Layer Design
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Solution Overview
Problem
Liquid crystal display devices for mobile devices face challenges in achieving a thin, lightweight, and cost-effective design with a narrow frame while minimizing the reflection of external light and the appearance deterioration of the frame region due to the high reflectance of metal lines.
Innovation Solution
The implementation of a reflectance-reducing layer with lower viewing surface side reflectance than the metal line layer, positioned between the support substrate and the metal line layer, along with the elimination of a light-shielding layer between the substrate and the polarizing plate, reduces external light reflection and prevents appearance deterioration in the frame region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If an inverted structure with TFT substrate larger than CF substrate is used to achieve a narrow frame, then the frame width is reduced, but the appearance of the frame region deteriorates due to high reflectance of line metal
Solution Approach 1:
A light-shielding layer is introduced as an intermediary component between the TFT substrate and the polarizing plate in the frame region. This layer specifically targets and blocks the harmful reflection from line metal without interfering with the display function, thereby resolving the contradiction between narrow frame design and appearance quality
Solution Approach 2:
The light-shielding layer is applied selectively only in the frame region where line metal is present, rather than uniformly across the entire substrate. This localized approach shields the problematic areas while maintaining the optical properties of the display region, solving the contradiction between frame narrowing and appearance deterioration
2Object-affected harmful factors
If a light-shielding layer is added to reduce external light reflection in the frame region, then appearance quality improves, but device thickness and component count increase
Solution Approach 1:
The light-shielding function is merged with the existing polarizing plate by forming the light-shielding layer on its lower surface. This integration combines two functions (polarization and light shielding) into a single component structure, improving appearance quality without increasing device thickness or component count
3Object-affected harmful factors
If a light-shielding layer is added to reduce external light reflection, then appearance quality improves, but device weight increases
Solution Approach 1:
The light-shielding layer is implemented as a thin film structure with thickness of 1-10 μm, using materials such as black resin or metal oxides. This thin film approach provides effective light shielding while minimizing the added weight, resolving the contradiction between appearance quality improvement and weight increase
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 allows for a thinner, lighter, and more cost-effective liquid crystal display device with a narrower frame, reduced component count, and improved appearance by minimizing reflection and unevenness in the frame region.
Implementation Method 1
the reflectance-reducing layer having a lower viewing surface side reflectance than the metal line layer
Data Source
AI summary
The liquid crystal display device includes: a display region for displaying an image; and a frame region surrounding the display region, the liquid crystal display device sequentially including from a viewing surface side toward a back surface side: a first polarizing plate; a first substrate provided with a switching element connected to a gate line and a source line; a liquid crystal layer; a second substrate; and a second polarizing plate, in the frame region, the first substrate sequentially including from a viewing surface side toward a back surface side a support substrate, a reflectance-reducing layer, and a metal line layer that overlaps the reflectance-reducing layer and includes at least one of a gate line layer provided with the gate line or a source line layer provided with the source line, the reflectance-reducing layer having a lower viewing surface side reflectance than the metal line layer.