IPS LCD Array Substrate Transparent Opaque Electrode Structure
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Solution Overview
Problem
In-plane switching liquid crystal display (IPS-LCD) devices face limitations in viewing angle and brightness due to the use of opaque common electrodes, which restrict the aperture ratio and lead to color inversion and non-uniform brightness.
Innovation Solution
The array substrate for IPS-LCD devices is fabricated using a common electrode and pixel electrode formed from transparent materials, with a double layer structure of transparent and opaque materials to prevent chuck stains and ensure uniform brightness, and the electrodes are formed in an alternating pattern to enhance display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If opaque common electrodes are used in IPS-LCD devices, then the electrodes can be formed with simple materials and processes, but the aperture ratio is reduced and brightness is limited
Solution Approach 1:
The patent employs a composite electrode structure consisting of an opaque lower electrode layer and a transparent upper electrode layer. This composite configuration allows the electrode to maintain electrical functionality while increasing light transmission, thereby improving brightness and aperture ratio without sacrificing manufacturability.
Solution Approach 2:
The patent transitions from a single-layer opaque electrode to a multi-layer structure with vertical dimensionality. By stacking transparent and opaque layers in the vertical direction, the electrode achieves both light transmission capability and ease of formation through conventional deposition processes.
2Illumination intensity
If transparent materials are used for common electrodes, then the aperture ratio and brightness are improved, but chuck stains occur and uniformity is compromised
Solution Approach 1:
The patent uses a composite electrode structure with an opaque lower layer and a transparent upper layer. The opaque lower layer acts as a mask during deposition, preventing chuck stains from affecting the transparent upper layer, thereby ensuring uniformity while maintaining high brightness.
Solution Approach 2:
The opaque lower electrode layer serves as an intermediary protective layer that prevents direct contact between the transparent upper electrode material and the chuck, thereby preventing stain formation and ensuring uniform electrode properties.
3Area of stationary object
If transparent electrodes are used, then the aperture ratio increases, but the electrode structure becomes more complex
Solution Approach 1:
The patent implements a composite electrode structure with transparent and opaque layers, which increases the aperture ratio by allowing light transmission through the transparent portions while maintaining a relatively simple deposition process that does not significantly complicate manufacturing.
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 improves the aperture ratio and brightness of IPS-LCD devices by using transparent electrodes, preventing chuck stains and enhancing display quality, resulting in wider viewing angles and uniform brightness.
Implementation Method 1
forming a common electrode on a substrate using a double layer of a transparent material layer and an opaque material layer
Implementation Method 2
forming a photoresist layer on the transparent material layer and the opaque material layer; exposing the photoresist layer to form a pattern
Data Source
AI summary
A method of fabricating an array substrate for an IPS mode LCD device includes: forming a common electrode using a double layer of a transparent material layer and an opaque material layer, the common electrode including a first transparent conductive material; forming source and drain electrodes on an ohmic contact layer and a data line connected to the source electrode, the source and drain electrodes being spaced apart from each other; forming a passivation layer on the source and drain electrodes and the data line, the passivation layer including a drain contact hole exposing the drain electrode; and forming a pixel electrode on the passivation layer, the pixel electrode including a second transparent conductive material and being formed in an alternating pattern with the common electrode.