Display Device Organic Pattern Width Variation
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Solution Overview
Problem
Current liquid crystal display (LCD) technologies face challenges in maintaining display quality and reliability due to variations in cell gap caused by mask sagging during the exposure process, leading to steps in organic patterns and potential deterioration of image quality.
Innovation Solution
The implementation of a display device design that includes organic patterns with varying hardness and width, formed through double exposure techniques, to minimize steps at the boundary of exposure areas and maintain a uniform cell gap, thereby preventing display quality deterioration and enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If single exposure process is used to form organic patterns, then manufacturing process is simple, but mask sagging causes cell gap variation and display quality deterioration
Solution Approach 1:
The exposure process is divided into two separate exposure steps: first exposure to form initial organic pattern, and second exposure to form additional organic pattern. This segmentation allows each exposure to be optimized independently, preventing mask sagging from causing cell gap variation while maintaining manufacturing feasibility.
Solution Approach 2:
The first organic pattern is formed in advance before the second exposure process. This preliminary action establishes a baseline structure that prevents subsequent mask sagging from affecting the overall cell gap uniformity, as the first pattern acts as a stabilizing element.
2Ease of manufacture
If organic patterns have uniform width, then manufacturing is straightforward, but steps occur at exposure boundaries causing display quality deterioration
Solution Approach 1:
Different regions of the organic pattern are designed with different widths: the first organic pattern has a first width, and the second organic pattern has a second width that is greater than the first width. This local variation in width eliminates steps at exposure boundaries, ensuring uniform display quality across the entire display area while maintaining manufacturing simplicity through the double exposure process.
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 effectively prevents changes in the cell gap, maintains display quality, and improves the reliability of the LCD by ensuring uniformity and consistency in the display device's performance.
Implementation Method 1
a first pixel that is located between the first circuit part and the second pixel along a direction and includes a first organic pattern that includes a first portion located on the base substrate and a second portion protruding upward from the first portion... the first portion, the second portion, the third portion and the fourth portion are made of the same material, and a width of the second portion measured along the direction is different from a width of the fourth portion measured along the direction
Data Source
AI summary
A display device includes a base substrate that comprises a display area and a peripheral area; a first circuit part that is located in the peripheral area of the base substrate; a first pixel that is located in the display area of the base substrate; and a second pixel that is located in the display area of the base substrate, wherein the first pixel is located between the first circuit part and the second pixel along a direction and comprises a first organic pattern that comprises a first portion located on the base substrate and a second portion protruding upward from the first portion, and the second pixel comprises a second organic pattern that comprises a third portion located on the base substrate and a fourth portion protruding upward from the third portion, wherein the first portion, the second portion, the third portion and the fourth portion are made of the same material, and a width of the second portion measured along the direction is different from a width of the fourth portion measured along the direction.