Liquid Crystal Display Pixel Electrode Side Wall Wiring
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Solution Overview
Problem
The manufacturing process of liquid crystal display panels faces challenges due to parasitic capacitance and complex electrode connections, leading to reduced manufacturing yields and display quality issues, particularly in the fringe field switching mode.
Innovation Solution
A liquid crystal display panel configuration and manufacturing method that includes a pixel electrode with a contact portion in contact with the drain electrode, a wiring portion extending on the side wall of the organic insulating film, and a body portion linked to the wiring portion, formed using a transparent conductor and photoresist patterns, which simplifies the electrode connection and reduces the risk of interruptions during manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pixel electrode follows a complicated path to connect to the drain electrode through multiple layers and side surfaces, then electrical connection is achieved, but the pixel electrode may be interrupted at midpoints due to manufacturing variations, reducing manufacturing yields
Solution Approach 1:
The pixel electrode is divided into three distinct portions: a contact portion that contacts the drain electrode, a wiring portion that extends on the side wall of the organic insulating film, and a body portion that is linked to the wiring portion. This segmentation allows each portion to be optimized for its specific function and reduces the risk of interruption at boundaries between layers during manufacturing.
Solution Approach 2:
The wiring portion of the pixel electrode extends in a direction substantially parallel to the side wall of the organic insulating film, utilizing the vertical dimension and side surface area rather than only the horizontal plane. This dimensional change provides a more reliable connection path that is less susceptible to manufacturing variations at layer boundaries.
2Object-generated harmful factors
If an inorganic insulating film is used between the lower electrode and signal line, then parasitic capacitance is reduced, but the structure and manufacturing method become complicated due to the need for relay electrodes
Solution Approach 1:
The invention removes the relay electrodes from the structure, allowing the pixel electrode to directly contact the drain electrode through the opening in the organic insulating film. This extraction of the intermediate relay electrode component simplifies the overall structure while maintaining low parasitic capacitance through the organic insulating film.
Solution Approach 2:
The organic insulating film serves as the primary intermediary between the signal line and the pixel electrode, providing both electrical insulation and a direct connection path through its opening. This eliminates the need for additional relay electrode intermediaries while maintaining the desired electrical characteristics.
3Reliability
If the pixel electrode extends above the opening of the organic insulating film on multiple layers, then connection to the drain electrode is achieved, but the manufacturing process becomes more complex and yields decrease due to potential interruptions
Solution Approach 1:
The pixel electrode has different local structures optimized for different functions: the contact portion for electrical contact with the drain electrode, the wiring portion extending on the side wall for connection, and the body portion on the organic insulating film for the main electrode function. This local quality differentiation simplifies the overall manufacturing by making each portion's role clear and reducing interference between manufacturing steps.
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 configuration improves manufacturing yields by preventing mid-point interruptions and enhances display quality by reducing parasitic capacitance and power consumption, while also simplifying the manufacturing process and increasing the aperture ratio for better brightness and contrast.
Implementation Method 1
parasitic capacitance is generated between the signal line and one of the electrodes (lower electrode) that is located closer to the substrate. The large parasitic capacitance is likely to cause deterioration in display quality. To reduce the parasitic capacitance, the insulating film between the lower electrode and the signal line desirably has a large thickness and a small relative dielectric constant.
Implementation Method 2
In a case where a material having photosensitivity is used as the organic insulating film, an opening (contact hole) can be directly formed therein by photolithography.
Data Source
AI summary
The organic insulating film has an opening through which the drain electrode is partially exposed. The opening has a side wall extending from above the drain electrode. The pixel electrode has a contact portion that is in contact with the drain electrode in the opening of the organic insulating film, a wiring portion that extends directly on the side wall of the organic insulating film from the contact portion, and a body portion that is linked to the wiring portion and is located on the organic insulating film. The interlayer insulating film covers the pixel electrode. The interlayer insulating film covers the source electrode and directly covers the semiconductor film between the source-electrode side surface and the drain-electrode side surface. The common electrode has fringes opposed to the pixel electrode via the interlayer insulating film.