Baking Device Lift Pin Blocking Member for LCD Alignment Film Uniformity
Solution Overview
Problem
The existing baking devices for liquid crystal alignment films in LCD panels suffer from non-uniform heating due to air streams passing through openings for lift pins, leading to temperature differences and color non-uniformity in the display panels, causing the Mura phenomenon.
Innovation Solution
A baking device with lift pins and blocking members that extend through openings in the heating table to prevent air streams from reaching the glass substrate, ensuring uniform heat distribution and temperature across the substrate during the baking process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If openings are provided in the heating table for lift pins to pass through, then the glass substrate can be supported and positioned, but air streams flow through the openings causing non-uniform heating and temperature differences
Solution Approach 1:
Blocking members are introduced as intermediary elements that prevent air streams from flowing directly through the openings to the glass substrate. These blocking members are positioned at the openings to block air flow while allowing heat to reach the substrate through conduction and radiation, thus mediating between the need for substrate support and the need for uniform heating
Solution Approach 2:
The harmful air stream flow path is extracted or removed from the system by blocking the openings. The blocking members effectively take out the problematic air flow pathway while preserving the structural function of the openings for lift pin passage, separating the support function from the harmful convection effect
2Use of energy by stationary object
If air streams flow through openings to the glass substrate, then cooling effect occurs, but non-uniform temperature distribution and color non-uniformity result
Solution Approach 1:
The blocking members are selectively positioned only at the openings where air streams would cause problems, rather than blocking the entire heating table. This local intervention maintains uniform heating in critical areas while preserving overall air circulation and cooling effects in non-critical areas, achieving local quality control to prevent color non-uniformity
3Ease of operation
If lift pins pass through openings in the heating table, then substrate can be lifted and positioned, but temperature differences occur between positions corresponding to openings and other positions
Solution Approach 1:
Blocking members serve as intermediary elements that allow lift pins to pass through while preventing air streams from reaching the substrate at opening positions. The blocking members are positioned to block air flow paths while maintaining lift pin accessibility, thus mediating between the mechanical positioning function and the thermal uniformity requirement
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 solution prevents non-uniform heating of alignment films, resulting in uniform optical properties and color reproducibility in the display panels, effectively addressing the Mura phenomenon.
Implementation Method 1
a heating table 35 with openings 37
Implementation Method 2
perform heating with a heating table 15 provided with openings
Implementation Method 3
air streams 14 can reach the bottom side surface of the glass substrate 11... through the openings
Data Source
AI summary
The present disclosure provides a baking device for liquid crystal alignment films, wherein the baking device includes a heating table with openings and lift pins extending and penetrating through the openings, and the lift pins can move between a retracting position and a stretching position to support a glass substrate coated with alignment films, wherein a blocking member is arranged on the lift pin in a surrounding manner to be tightly engaged thereon, so as to block the air stream flowing toward the glass substrate through the openings when the lift pins are situated in the retracting position. With the provision of the blocking members, the air streams flowing toward the glass substrate coated with alignment films can be resisted in the baking process, which prevents the air streams from affecting heat distribution and temperature distribution.