TFT Array Laser Positioning with Auxiliary Points
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Solution Overview
Problem
Laser positioning devices fail to accurately position TFT array substrates due to scattered light beams caused by rough surfaces and impurities, leading to unsuccessful positioning.
Innovation Solution
The method involves emitting light beams to both a to-be-positioned point and auxiliary positioning points, receiving reflected light beams, and determining height information using valid beams from either the to-be-positioned point or auxiliary points, ensuring accurate positioning even if the primary beam is scattered.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a laser emitter emits a light beam to a predetermined to-be-positioned point on the TFT array, then height information can be obtained for positioning, but the light beam may be scattered by surface roughness or impurities causing positioning failure
Solution Approach 1:
The patent divides the single positioning point into multiple auxiliary positioning points surrounding the to-be-positioned point. Instead of relying on one critical point, the system segments the positioning function across multiple points, so that if one point fails due to scattering, others can still provide valid data for height determination.
Solution Approach 2:
The patent performs preliminary action by pre-establishing multiple auxiliary positioning points around the to-be-positioned point before actual positioning occurs. This preparatory arrangement ensures that alternative paths for obtaining height information are already in place, ready to be used if the primary positioning point fails.
2Reliability
If multiple auxiliary positioning points are added to improve positioning reliability, then the positioning success rate increases, but the device complexity increases
Solution Approach 1:
The auxiliary positioning points serve multiple functions: they act as backup points when the primary point fails, provide additional data for averaging to improve accuracy, and can validate surface quality. This multi-functionality justifies the added complexity by providing multiple benefits from the same structural addition.
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 significantly improves the success rate and accuracy of positioning by utilizing auxiliary points to determine height information when the primary beam is not received, overcoming surface roughness and impurity issues.
Implementation Method 1
a laser emitter of the laser positioning device emits a light beam to a predetermined to-be-positioned point on the TFT array. The light beam is then reflected by the predetermined point to form a reflected light beam and is received by a receiver of the positioning device.
Data Source
AI summary
The present disclosure provides a positioning method and a positioning device. The positioning device includes: an emitter for emitting light beams to a to-be-positioned point and auxiliary positioning points; a receiver for receiving reflected light beams reflected by the to-be-positioned point and the auxiliary positioning points; a judging module for judging whether the reflected light beam reflected by the to-be-positioned point is received or not; and a calculating module for receiving a judging result from the judging module and determining height information of the to-be-positioned point according to the reflected light beams reflected by the to-be-positioned point and the auxiliary positioning points. Thus, the height information of the to-be-positioned point can be determined according to the reflected light beams reflected by the auxiliary positioning points even if the reflected light beam reflected by the to-be-positioned point cannot be received, which improves the success rate of the positioning.