COT LCD Double Layer Light Blocking Pattern
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Solution Overview
Problem
Conventional liquid crystal display devices face challenges in achieving high-image quality and luminance due to the limitations of traditional black matrices, which require multi-layer or high-thickness structures, increasing costs and process complexity, while also suffering from reflectance and transmittance issues that affect image quality and luminance.
Innovation Solution
A liquid crystal display device with a color filter on TFT (COT) structure employs a light blocking pattern with a double layer structure, featuring an upper layer with low-reflectance characteristics and a lower layer with low-transmittance and high-conductance characteristics, replacing the traditional black matrix, thereby enhancing image quality and luminance without the need for multi-layer or high-thickness designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a traditional black matrix is used to block light, then light blocking function is achieved, but the structure requires multi-layer or high-thickness design which increases manufacturing complexity and cost
Solution Approach 1:
The patent extracts the light blocking function from the traditional black matrix structure and relocates it to the pixel electrode layer. By forming a light blocking pattern directly in the pixel electrode material at the pixel electrode formation step, the design eliminates the need for separate black matrix layers while achieving the same light blocking effect. This integration reduces structural complexity and manufacturing steps.
Solution Approach 2:
The patent merges the light blocking function with the pixel electrode function by forming the light blocking pattern using the same pixel electrode material in the same process step. This consolidation eliminates the need for separate black matrix layers and reduces the overall device complexity while maintaining effective light blocking performance.
2Object-affected harmful factors
If traditional black matrix structures are used, then light blocking is achieved, but reflectance and transmittance issues affect image quality and luminance
Solution Approach 1:
The patent changes the material parameters by using transparent conductive materials with specific optical properties for the pixel electrode, which also serve as the light blocking pattern. By carefully selecting materials with appropriate refractive indices and absorption coefficients, the design achieves effective light blocking while maintaining optimal luminance and image quality, avoiding the reflectance and transmittance issues associated with traditional black matrices.
Solution Approach 2:
The patent employs composite material strategies by using transparent conductive oxides or other transparent conductive materials that combine both electrode functionality and light blocking capability. These composite materials provide the dual function of electrical conduction and optical control, achieving superior image quality and luminance compared to traditional black matrix approaches.
3Object-affected harmful factors
If multi-layer or high-thickness black matrix structures are used, then light blocking performance improves, but manufacturing cost and process complexity increase
Solution Approach 1:
The patent extracts the light blocking function from the black matrix structure and integrates it into the pixel electrode formation process. By forming the light blocking pattern directly when creating the pixel electrode, the design eliminates the need for separate black matrix deposition and patterning steps, thereby reducing manufacturing complexity and cost while maintaining effective light blocking performance.
Solution Approach 2:
The patent merges the light blocking pattern formation with the pixel electrode formation into a single process step. This integration eliminates the need for additional manufacturing steps required for separate black matrix structures, simplifying the overall manufacturing process and reducing costs while achieving the necessary light blocking performance.
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 double layer light blocking pattern effectively addresses image quality and luminance issues by providing low reflectance and transmittance characteristics, similar to low-resistance electrodes, while simplifying the manufacturing process and reducing costs, thus achieving high-image quality and performance.
Implementation Method 1
an upper layer having a low-reflectance characteristic
Implementation Method 2
a lower layer having a low-transmittance and high-conductance characteristic
Implementation Method 3
providing low reflectance and transmittance characteristics
Data Source
AI summary
In a liquid crystal display device and a method of fabricating the same in accordance with the present invention, there is provided a liquid crystal display device with a color filter on TFT (COT) structure for a high-image quality and high-performance display, in which a light blocking pattern is formed with a double layer structure of an upper layer having a low-reflectance characteristic and a lower layer having a low-transmittance and high-conductance characteristic to replace a black matrix, thereby solving the image quality and luminance issues.