Display Device Measurement Indicia Alignment Error Compensation
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Solution Overview
Problem
Image distortion occurs at the boundaries of pattern masks during the manufacturing of large flat panel display devices due to the size limitations of pattern masks, and existing methods cannot accurately measure alignment errors outside the display area.
Innovation Solution
Incorporating measurement indicia, such as alignment patterns, within the display area of the display device to accurately measure and compensate for alignment errors between multiple masks used during the manufacturing process, specifically using colored measurement patterns formed through the same process as the color filters to reduce image distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If multiple smaller pattern masks are used to manufacture large display devices, then the display device size can be increased beyond mask size limitations, but image distortion occurs at the boundaries of the masks
Solution Approach 1:
Alignment patterns are formed in advance within the display area during the manufacturing process. These patterns serve as reference markers that are established before the alignment measurement and compensation steps, enabling precise measurement of mask alignment errors at boundaries
Solution Approach 2:
The alignment patterns provide feedback information about mask alignment accuracy. By measuring the positions of these patterns, the system can detect alignment errors and apply compensation to correct the distortion at mask boundaries, ensuring high manufacturing precision
2Area of stationary object
If alignment patterns are placed outside the display area for measurement, then the display area can be maximized, but the alignment error measurement becomes inaccurate
Solution Approach 1:
The patent applies local quality by placing alignment patterns specifically within the display area rather than outside it. This localized placement ensures that the measurement is taken from the actual display region where alignment accuracy is critical, providing accurate measurement of alignment errors that affect the display quality
Data Source
AI summary
According to an aspect of the invention, a display device includes: a first substrate; and a plurality of pixels including a first pixel disposed in the first substrate. The first pixel includes: a first transistor; a first electrode connected with the first transistor; a first color filter having a color and overlapping the first electrode connected with the first transistor; and a third measurement indicia having a color and overlapping the first color filter, and the first color filter has a color different from the color of the third measurement indicia.