LCD Exposure Layout Temperature Control and Footprint Reduction
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Solution Overview
Problem
The existing exposure layout for manufacturing liquid crystal display devices faces challenges in maintaining precise substrate temperature, leading to potential exposure errors and increased tact time, while also requiring additional space due to the need for longer layouts.
Innovation Solution
The proposed exposure layout includes a thru-conveyor, first and second robot arms, a hot plate for solvent removal, a cool plate for temperature reduction, a buffer for temporary storage, and a temperature control unit to adjust the substrate temperature immediately before exposure, with a third robot arm facilitating efficient substrate handling and minimizing footprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the substrate is conveyed through a long exposure layout with multiple robot arms and units, then the substrate can undergo various processing steps, but the footprint of the layout increases
Solution Approach 1:
The patent combines multiple functions into integrated units. The temperature control unit integrates heating and cooling capabilities in one location. The buffer unit combines temporary storage with temperature stabilization functions. This merging reduces the number of separate components and minimizes the overall layout footprint while maintaining full processing capability.
Solution Approach 2:
The patent utilizes vertical space and multi-level positioning to reduce horizontal footprint. Robot arms operate in three-dimensional space to access substrates from different positions. The buffer and temperature control units are positioned to optimize space utilization, allowing complex processing in a compact horizontal arrangement.
2Productivity
If additional robot arms are added to decrease tact time, then the processing speed increases, but the footprint and device complexity increase
Solution Approach 1:
The buffer unit performs preliminary actions by temporarily storing substrates at optimized positions before exposure. The temperature control unit prepares substrates in advance by adjusting temperature to optimal levels. This preliminary preparation allows the exposure unit to operate continuously without waiting for temperature adjustments or substrate positioning, thereby decreasing tact time without adding more robot arms.
Solution Approach 2:
The buffer unit acts as an intermediary between the substrate supply and the exposure unit. It decouples the timing between substrate preparation and exposure operations, allowing the exposure unit to maintain continuous operation. This intermediary buffer eliminates idle time in the process cycle without requiring additional robot arms for substrate handling.
3Device complexity
If the substrate temperature is not precisely controlled before exposure, then the layout can be simpler, but the exposure precision decreases
Solution Approach 1:
The temperature control unit dynamically adjusts the substrate temperature to optimal parameters for exposure. By controlling temperature, the system compensates for thermal expansion or contraction that would otherwise cause positioning errors. This parameter control ensures precise exposure positioning without requiring overly complex mechanical positioning systems.
Solution Approach 2:
The temperature control unit incorporates temperature sensing and feedback control mechanisms. Temperature sensors monitor substrate temperature in real-time, and the control system adjusts heating or cooling accordingly to maintain precise temperature control. This feedback mechanism ensures consistent substrate temperature and positioning accuracy without requiring complex mechanical control systems.
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 allows for precise temperature control of substrates, reducing the likelihood of defective exposures and decreasing tact time per cycle without the need for additional robot arms, thus minimizing the overall layout size.
Implementation Method 1
A hot plate removes solvent from the substrate
Implementation Method 2
A cool plate lowers a temperature of the substrate from which the solvent is removed
Implementation Method 3
an exposure unit to apply an exposure process to the substrate
Data Source
AI summary
An apparatus for manufacturing a liquid crystal display device is disclosed. A first robot arm at a loading side of the thru-conveyor receives a substrate coated with photoresist and conveys the substrate to a thru-conveyor. A softbake hot plate (SHP) at the unloading side of the thru-conveyor removes solvent from the substrate. A cool plate lowers the substrate temperature from which the solvent is removed. A buffer temporarily stores the substrate having the lowered temperature. A second robot arm between the thru-conveyor, the SHP, the cool plate and a loading side of the buffer, loads/unloads the substrate. A temperature control unit adjusts the substrate temperature unloaded from the buffer. A third robot arm between the unloading side of the buffer, the temperature control unit and an exposure unit that exposes the substrate, loads/unloads the substrate.