Graduated Scales for LCD Polarizing Sheet Alignment
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Solution Overview
Problem
The existing manufacturing process of liquid crystal display devices faces challenges in accurately aligning and measuring the polarizing sheets due to the small distances between their edges and the display panel components, leading to poor measurement accuracy and effectiveness when using a ruler.
Innovation Solution
Incorporating graduated scales on the color filter and array substrates within non-display regions to measure the distances of the polarizing sheets' edges, allowing for precise alignment and measurement without manual errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual measurement with a ruler is used to check affixation accuracy of polarizing sheets, then the measurement process is simple and easy to operate, but the measurement precision is poor due to extremely small distances between edges
Solution Approach 1:
The patent introduces an intermediary measurement mark structure consisting of a first measurement mark on the color filter substrate and a second measurement mark on the array substrate. These marks serve as mediators between the polarizing sheets and the measurement tool, enabling indirect measurement of the distances from polarizing sheet edges to substrate edges. This intermediary approach transforms the difficult direct measurement into an easier relative position measurement, significantly improving measurement precision while maintaining operational simplicity.
2Object-affected harmful factors
If the upper and lower polarizing sheets are affixed with edges close to the display panel edges to prevent light leakage, then the light leakage prevention is improved, but the measurement and alignment difficulty increases due to extremely small distances
Solution Approach 1:
The measurement mark structure acts as an intermediary reference system that facilitates the detection and measurement of polarizing sheet positions even when they are affixed close to the display panel edges. By measuring the relative positions between the measurement marks and polarizing sheet edges, the patent enables accurate detection without requiring direct measurement of the extremely small distances between polarizing sheets and panel edges, thus solving the measurement difficulty while maintaining light leakage prevention.
Solution Approach 2:
The patent transforms the one-dimensional direct distance measurement problem into a two-dimensional relative position measurement problem. Instead of directly measuring the small linear distance between polarizing sheet edges and panel edges, the measurement marks provide reference points that allow measurement of relative positions in a broader dimensional context, making the measurement process feasible and accurate.
Data Source
AI summary
Embodiments of the present disclosure relate to the field of display technology, and particularly, to a liquid crystal display device and a method for manufacturing the same, which effectively improve accuracy and effectiveness of checking affixation of the polarizing sheets. The liquid crystal display device comprises a color filter substrate, an array substrate, an upper polarizing sheet and a lower polarizing sheet. The color filter substrate comprises a first graduated scale and a second graduated scale, the array substrate comprises a third graduated scale and a fourth graduated scale, and the first graduated scale, the second graduated scale, the third graduated scale and the fourth graduated scale are arranged within a non-display region. The first graduated scale is used to measure a distance of at least one first edge of first edges parallel with each other of the upper polarizing sheet to an edge of the color filter substrate closer to the at least one first edge; and the second graduated scale is used to measure a distance of at least one second edge of second edges parallel with each other of the upper polarizing sheet to an edge of the color filter substrate closer to the at least one second edge; and the third graduated scale is used to measure a distance of at least one third edge of third edges parallel with each other of the lower polarizing sheet to an edge of the array substrate closer to the at least one third edge; and, the fourth graduated scale is used to measure a distance of at least one fourth edge of fourth edges parallel with each other of the lower polarizing sheet to an edge of the array substrate closer to the at least one fourth edge.