Mask Assist Pattern for LCD Pixel Electrode Light Exposure Control
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Solution Overview
Problem
In liquid crystal display apparatuses, texture defects occur due to improper formation of pixel electrodes adjacent to common circuit areas, leading to decreased pixel performance and overall quality, as materials are over-exposed during the manufacturing process.
Innovation Solution
A mask with an assist pattern is used, featuring a pixel area and a circuit area, where the assist pattern is strategically placed at the end of the pixel pattern to block light from the circuit area, ensuring proper shape formation of the pixel electrode by controlling light exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the pixel electrode pattern is formed adjacent to the common circuit area, then the manufacturing process is simplified and substrate misalignment is reduced, but the pixel electrode material becomes over-exposed by light from the circuit area, causing texture defects
Solution Approach 1:
The mask pattern is segmented into distinct functional regions: a pixel pattern area for forming the pixel electrode and a circuit pattern area for forming common circuits. This segmentation allows independent optimization of each area while preventing light leakage between them, resolving the contradiction between manufacturing simplicity and precision.
Solution Approach 2:
An assist pattern is introduced as an intermediary element between the pixel pattern and the circuit pattern. This assist pattern acts as a light-blocking mediator that prevents light from the circuit area from over-exposing the pixel electrode material, while not interfering with the formation of either pattern.
2Productivity
If the pixel electrode pattern extends close to the circuit area, then the device layout is optimized and more pixels can be accommodated, but light exposure control becomes difficult causing over-exposure defects
Solution Approach 1:
The assist pattern serves as a light-blocking intermediary positioned between the pixel electrode pattern and the circuit pattern. This mediator prevents light from the circuit area from reaching and over-exposing the pixel electrode material, enabling closer spacing of pixels without compromising manufacturing precision.
Solution Approach 2:
The assist pattern extracts and isolates the light-blocking function from the main pixel and circuit patterns. By separating this protective function into a dedicated assist pattern element, the pixel and circuit patterns can be optimized for their primary functions while the assist pattern handles the light exposure control.
3Device complexity
If conventional mask patterns are used without assist patterns, then the mask structure is simpler, but texture defects occur in the pixel electrode forming process
Solution Approach 1:
The assist pattern is introduced as a specialized intermediary element in the mask structure. Although this increases mask complexity, it provides critical light-blocking functionality that prevents texture defects in the pixel electrode, thereby improving overall device reliability.
Solution Approach 2:
The assist pattern converts the potentially harmful light leakage from the circuit area into a beneficial controlled light-blocking effect. By strategically positioning the assist pattern, the light that would otherwise cause over-exposure is now blocked, preventing defects and improving pixel quality.
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 assist pattern effectively reduces texture defects by preventing light from over-exposing the pixel electrode material, resulting in improved pixel performance and reduced defects in the liquid crystal display apparatus.
Implementation Method 1
the assist pattern is strategically placed at the end of the pixel pattern to block light from the circuit area, ensuring proper shape formation of the pixel electrode by controlling light exposure
Data Source
AI summary
A mask may include a circuit area and a pixel area. The circuit area includes a circuit pattern. The pixel area includes a pixel pattern which is extended in a length direction and an assist pattern which is at an end portion of the pixel pattern and adjacent to the circuit area.