LCD Protrusion Uniformity via Photoresist Exposure Control
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Solution Overview
Problem
In liquid crystal display (LCD) fabrication, the uneven surface of substrates leads to varying protrusion sizes due to surface step differences, causing inconsistent liquid crystal alignment and deteriorating image quality across pixels.
Innovation Solution
A method involving the formation of a transparent electrode on a substrate with step differences, where a photoresist film is exposed and developed to create protrusions with controlled sizes, using varying exposure amounts and photo mask designs to ensure consistent protrusion sizes despite surface irregularities, and incorporating color filters with different thicknesses and colors to adjust exposure accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If protrusions are formed by coating photoresist film on substrate with uneven surface, then protrusions can be formed to control liquid crystal alignment, but protrusion sizes vary according to surface step differences causing inconsistent liquid crystal alignment
Solution Approach 1:
The patent applies local quality by varying the exposure amount of photoresist film according to the local surface height. Areas with higher step differences receive different exposure doses to compensate for the uneven surface, ensuring that protrusions formed in different regions achieve uniform size and shape despite the underlying surface variations.
Solution Approach 2:
The patent changes the exposure parameter (exposure amount) of the photoresist film to compensate for surface unevenness. By adjusting the exposure dose based on the step differences in substrate height, the protrusion formation process achieves consistent dimensions across the entire substrate surface.
2Manufacturing precision
If color filters with different thicknesses are used to adjust exposure amounts, then protrusion size consistency can be improved, but manufacturing complexity increases
Solution Approach 1:
The patent makes the color filter layer serve multiple functions: it provides its primary function of color filtering for display, and simultaneously acts as an exposure dose modulator to compensate for surface step differences. By varying the color filter thickness, the system achieves both color display and protrusion size uniformity without requiring separate compensation structures.
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 ensures consistent liquid crystal alignment and improved image quality by maintaining uniform protrusion sizes across pixels, enhancing display quality and viewing angles.
Implementation Method 1
the photoresist film is exposed and developed to form a protrusion
Data Source
AI summary
In a method of fabricating a liquid crystal display device, when a photoresist film formed on a substrate for the liquid crystal display device is exposed and developed, protrusions are formed on the substrate for increasing a viewing angle of the liquid crystal display device. Although the substrate is formed with step differences thereon caused by various intermediate films, the protrusions may have a same size since an exposure amount to the photoresist film is varied according to the step differences of the substrate on which the protrusions are formed. Thus, the liquid crystal display device may have an improved display quality.