Pixel Electrode Lamination for Light Leakage Prevention in LCDs
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional liquid crystal display devices with a Color Filter on Thin Film Transistor (COT) structure face issues of increased production costs and light leakage due to the formation of a black matrix, which can misalign and reduce the opening degree of the device.
Innovation Solution
A liquid crystal display device without a black matrix, featuring a pixel electrode with a lamination structure of transparent metal and opacity metal, where the transparent metal part is wider than the opacity metal part, and a method for fabrication that eliminates the need for a black matrix and over-coat layer, simplifying the production process and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a black matrix is formed to prevent light leakage, then light leakage is prevented, but the opening degree of the device is reduced and production costs increase
Solution Approach 1:
The invention extracts and removes the black matrix component from the display device structure. By eliminating the black matrix entirely and using a transparent substrate without additional light-blocking layers, the patent achieves prevention of light leakage through the electrode structure itself rather than through a separate black matrix layer, thereby maintaining high opening degree.
Solution Approach 2:
The transparent electrode serves multiple functions: it provides electrical connectivity for the display function while simultaneously acting as the light-blocking structure that traditionally required a separate black matrix. This multi-functional design eliminates the need for dedicated light-blocking components, maintaining both anti-light-leakage performance and high opening degree.
2Object-affected harmful factors
If a black matrix is formed to prevent light leakage, then light leakage is prevented, but production costs increase
Solution Approach 1:
The invention removes the black matrix component from the manufacturing process entirely. By designing the electrode structure to inherently prevent light leakage without requiring a separate black matrix layer, the patent reduces the number of manufacturing steps, materials required, and associated costs while maintaining effective light leakage prevention.
Solution Approach 2:
The patent merges the functions of the transparent electrode and the light-blocking structure into a single integrated component. This consolidation eliminates the need for separate black matrix fabrication processes, reducing manufacturing complexity and production costs while maintaining effective light leakage prevention.
3Illumination intensity
If the transparent metal part is made wider than the opacity metal part, then luminescence is improved, but the structure becomes more complex
Solution Approach 1:
The invention applies different properties to different regions of the electrode structure. The transparent metal portion has a wider width optimized for light transmission and luminescence, while the opaque metal portion has a narrower width optimized for electrical connectivity and light blocking. This local differentiation of dimensions and properties optimizes performance without requiring complex multi-layer structures.
Solution Approach 2:
The electrode structure uses a composite of transparent metal and opaque metal materials with different optical properties. The transparent metal layer provides enhanced luminescence and light transmission, while the opaque metal layer provides electrical connectivity and localized light blocking. This composite structure achieves superior optical performance through material composition rather than structural complexity.
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 prevents light leakage, improves luminescence, and reduces production costs by eliminating the black matrix, while maintaining the opening degree of the device.
Implementation Method 1
a pixel electrode which passes through the second and the first passivation layers, is electrically connected to a part of the thin film transistor and has a lamination structure of transparent metal and opacity metal, wherein the transparent metal part has a width wider than that of the opacity metal part
Data Source
AI summary
Disclosed are a liquid crystal display device without a black matrix capable of eliminating light leakage while not decreasing opening degree and reducing production costs and, in addition, a method for fabricating the liquid crystal display device described above. The liquid crystal display device includes: a thin film transistor formed on a first substrate; a first passivation layer formed on the first substrate including the thin film transistor; a color filter layer formed on the first passivation layer; a second passivation layer formed on the first substrate including the color filter layer; a pixel electrode which passes through the second and the first passivation layers, is electrically connected to a part of the thin film transistor and has a lamination structure of transparent metal and opacity metal, wherein the transparent metal part has a width wider than that of the opacity metal part; and a second substrate corresponding to the first substrate.