Opaque Metal Electrode LCD with Reflection Control Layer
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Solution Overview
Problem
Liquid crystal display (LCD) devices with opaque metal electrodes suffer from external light reflection, leading to deteriorated picture quality and rainbow-colored images due to the inherent reflectivity of these electrodes.
Innovation Solution
A reflection control layer with a refractive index smaller than the opaque metal electrodes is introduced on at least one of the pixel and common electrodes, formed from materials like transparent conductive oxides or polymers, to control and minimize external light reflectivity, thereby preventing rainbow-colored images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If opaque metal material is used for common electrode and pixel electrode, then contrast ratio is improved, but external light reflection occurs causing rainbow-color image
Solution Approach 1:
A reflection control layer is introduced as an intermediary between the external light environment and the opaque metal electrodes. This layer mediates the interaction by controlling the reflectivity of external light before it reaches the metal electrodes, thereby preventing rainbow-color image while preserving the contrast ratio enhancement provided by the opaque metal material
Solution Approach 2:
The electrode structure is transformed from a single opaque metal material to a composite structure consisting of opaque metal material combined with a reflection control layer. This composite structure leverages the high contrast ratio capability of the metal material while the reflection control layer suppresses external light reflection, resolving the technical contradiction
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
The solution effectively reduces external light reflectivity, enhancing picture quality by minimizing the occurrence of rainbow-colored images while maintaining the contrast ratio and black luminance improvements provided by opaque metal electrodes.
Implementation Method 1
A reflection control layer with a refractive index smaller than the opaque metal electrodes is introduced on at least one of the pixel and common electrodes
Data Source
AI summary
Disclosed is an LCD device comprising: a substrate; gate and data lines intersecting each other on the substrate; a thin film transistor at the intersection of the gate and data lines; a pixel electrode electrically connected with the thin film transistor; a common electrode forming an electric field with the pixel electrode; and a reflection control layer on at least one of the pixel electrode and common electrode. At this time, at least one electrode of the pixel electrode and common electrode is formed of the opaque metal material, to thereby improve black luminance and contrast ratio. Simultaneously, the reflection control layer is formed on the at least one electrode of the opaque metal material so that it is possible to adjust the reflectivity of external light, and to prevent the problem of rainbow-colored image.