Light Shielding Layer for LCD Bonding Measurement Accuracy
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Solution Overview
Problem
In liquid crystal display devices, light leakage occurs from the opposing substrate side due to the transmission of light emitted from the back light through areas without alignment markers, which affects the accuracy of bonding position measurements.
Innovation Solution
A light shielding layer is disposed between the component substrate and the measurement portion on the opposing substrate to prevent light transmission from the back light, ensuring that the light emitted from the back light is shielded and leakage is suppressed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If alignment markers are formed on the surfaces of substrates for bonding position measurement, then bonding position measurement is enabled, but light leakage occurs from the opposing substrate side
Solution Approach 1:
The patent divides the substrate surface into distinct functional regions: measurement portions (alignment markers) and light shielding portions. The light shielding layer is segmented to correspond specifically to measurement opening portions, creating a segmented structure that separately handles measurement and light blocking functions. This segmentation allows the measurement markers to remain visible while preventing light leakage through the opening portions.
Solution Approach 2:
The light shielding layer acts as an intermediary element between the measurement portions and the light source. It is strategically positioned to block light from reaching the measurement opening portions while maintaining the visibility and functionality of the alignment markers. This intermediary structure resolves the contradiction by mediating between the need for light blocking and the need for measurement capability.
2Object-generated harmful factors
If light shielding layer is added to prevent light leakage, then light leakage is suppressed, but device structure becomes more complex
Solution Approach 1:
The patent merges the light shielding function with the existing measurement portion structure. The light shielding layer is integrated into the substrate assembly and positioned to correspond with measurement opening portions, combining multiple functions (light blocking and measurement facilitation) into a unified structure. This merging approach adds light leakage suppression while minimizing the increase in overall device complexity.
Solution Approach 2:
The light shielding layer is applied locally only at the measurement opening portions rather than across the entire substrate surface. This localized application provides light leakage suppression precisely where needed (at the opening portions) while leaving other areas unchanged, thereby minimizing the increase in device complexity and maintaining manufacturing efficiency.
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 implementation of a light shielding layer effectively prevents light leakage from the opposing substrate side, enhancing the accuracy of bonding position measurements by ensuring that the light emitted from the back light is shielded, thereby improving the measurement precision.
Implementation Method 1
a light shielding layer that is disposed between the component substrate and the second measurement portion and prevents transmission of light emitted from the back light through the measurement opening portion
Data Source
AI summary
A liquid crystal display device includes: a component substrate including a transistor device; an opposing substrate disposed so as to face the component substrate through a liquid crystal layer; a back light disposed on a side of the component substrate located opposite to the opposing substrate; first and second measurement portions formed on a surface of the component substrate and the opposing substrate, respectively, located on the liquid crystal layer side and used for measuring a difference between bonding positions of the component substrate and the opposing substrate; a measurement opening portion disposed on the second measurement portion side; and a light shielding layer disposed between the component substrate and the second measurement portion and preventing transmission of light from the back light through the measurement opening portion.