Dual-Layer LCD Electrodes Reduce Surface Reflection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal displays (LCDs) face challenges in achieving high contrast ratios while minimizing surface reflection from external light, as single metal electrodes cause significant reflectivity issues, and using transparent conductive films to reduce reflectivity degrades black luminance.
Innovation Solution
The LCD employs a dual-layer conductive pattern comprising a metal film and a low reflection film, or a transparent conductive film with an embossed surface, to form electrodes, which reduces surface reflectivity and enhances contrast ratios by controlling light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If pixel electrodes and common electrodes are formed as a single metal film, then high reflectivity is achieved, but surface reflection from external light increases causing spots and degraded display quality
Solution Approach 1:
The electrode structure is segmented into multiple layers: a metal film layer and a transparent conductive film layer. This segmentation allows the metal film to provide high reflectivity while the transparent conductive film reduces surface reflection of external light, resolving the contradiction between achieving high reflectivity and minimizing harmful surface reflection.
Solution Approach 2:
The electrode is formed as a composite structure combining metal film and transparent conductive film. The metal film provides the necessary reflectivity for display brightness, while the transparent conductive film overlay reduces external light reflection and prevents spot formation, achieving both high reflectivity and reduced surface reflection simultaneously.
2Object-affected harmful factors
If pixel electrodes and common electrodes are formed as a transparent conductive film, then surface reflection is reduced, but black luminance quality degrades resulting in degraded contrast ratio
Solution Approach 1:
The electrode structure is segmented into a metal film layer for high reflectivity and a transparent conductive film layer for reducing surface reflection. This segmentation ensures that the metal film maintains black luminance quality and contrast ratio, while the transparent conductive film specifically addresses surface reflection without compromising overall display quality.
Solution Approach 2:
The composite electrode structure combines the advantages of both metal film (high reflectivity and good black luminance) and transparent conductive film (reduced surface reflection). The metal film layer ensures maintained contrast ratio and black luminance quality, while the transparent conductive film layer reduces surface reflection, achieving both goals simultaneously.
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 approach effectively minimizes surface reflectivity and improves contrast ratios by absorbing external light, reducing the generation of spots and maintaining image quality.
Implementation Method 1
The low reflection film formed on the metal film absorbs external light, thereby reducing surface reflectivity and preventing constructive or destructive interference with backlight, which eliminates spots with diffraction patterns on the display image
Implementation Method 2
The third conductive pattern is formed as a dual-layer comprising a metal film and a low reflection film formed on the metal film, controlling light transmittance to enhance contrast ratio while reducing surface reflectivity
Data Source
AI summary
A liquid crystal display (LCD) includes: a gate line formed as a first conductive pattern; a common line formed as the first conductive pattern; a data line insulatedly crossing the gate line and the common line, and formed as a second conductive pattern; a thin film transistor (TFT) formed at a crossing of the gate line and the data line; a common electrode formed as a third conductive pattern, and connected with the common line; and a pixel electrode connected with the TFT and formed as the third conductive pattern to form a horizontal field together with the common electrode, wherein the third conductive pattern is formed as a dual-layer comprising a metal film and a low reflection film formed on the metal film.