LCD Light Shielding Segmentation for Reflection and Contact Defects
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Solution Overview
Problem
Liquid crystal display (LCD) devices experience surface reflection issues due to external light incident on metal electrodes, particularly in the peripheral areas where light shielding units are not effectively integrated, leading to increased step differences and potential contact defects.
Innovation Solution
The integration of a step difference pattern on the first electrode, with a second electrode electrically connected to it, and strategically placed light shielding units of varying heights to prevent exposure of metal electrodes, along with a conductive spacer to maintain uniform intervals and prevent short defects, addresses the surface reflection issue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light shielding unit is spaced apart from metal electrodes to prevent step difference increase and contact defects, then contact reliability is improved, but surface reflection occurs due to exposed metal electrodes
Solution Approach 1:
The light shielding unit is divided into multiple segments at different heights. The first light shielding unit has a first height and the second light shielding unit has a second height that is lower than the first height. This segmentation allows different portions of the light shielding unit to serve different functions: the higher portion shields light effectively while the lower portion maintains appropriate spacing from electrodes to prevent contact defects.
Solution Approach 2:
Different portions of the light shielding unit are designed with different heights to create local variations in light shielding capability and spacing characteristics. The first light shielding unit provides stronger light shielding where needed, while the second light shielding unit maintains closer spacing to electrodes in specific areas, optimizing both reflection prevention and contact reliability locally.
2Object-affected harmful factors
If light shielding unit contacts metal electrodes to prevent surface reflection, then surface reflection is reduced, but step difference increases and contact defects occur
Solution Approach 1:
The light shielding unit is segmented into portions with different heights, allowing it to contact or approach metal electrodes in certain areas without creating excessive step differences across the entire structure. This segmentation enables controlled proximity to electrodes for reflection prevention while maintaining manufacturing precision in other areas.
Solution Approach 2:
The light shielding unit exhibits local quality variations through its multi-height structure. In areas where surface reflection is critical, the light shielding unit is positioned closer to or contacts the metal electrodes. In other areas, it maintains greater spacing to minimize step differences, optimizing the balance between reflection control and manufacturing precision locally.
3Object-affected harmful factors
If light shielding unit contacts metal electrodes to prevent surface reflection, then surface reflection is reduced, but contact defects increase
Solution Approach 1:
The light shielding unit is divided into segments of different heights, which reduces the risk of contact defects by ensuring that not all portions contact the metal electrodes simultaneously. This segmentation distributes the contact interface across multiple discrete points, lowering the probability of defects propagating across the entire structure.
Solution Approach 2:
Different portions of the light shielding unit are positioned at different distances from the metal electrodes, creating local variations in contact probability. This local quality approach ensures that light shielding effectiveness is achieved in critical areas without requiring uniform contact across all areas, thereby reducing overall contact defect risks.
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 configuration effectively reduces surface reflection of external light and prevents contact defects by ensuring uniform voltage application and maintaining electrical connections, enhancing the overall image quality and manufacturing precision of LCD devices.
Implementation Method 1
Upon applying voltage to the electrodes, liquid crystal molecules in the liquid crystal layer are rearranged to adjust the amount of light transmitted therethrough
Implementation Method 2
a light shielding unit is typically provided to prevent reflection of externally incident light from a surface of the metal electrode
Data Source
AI summary
A liquid crystal display device includes a first substrate, on which a display area and a non-display area are defined, a first electrode on the first substrate in the non-display area, where the first electrode receives a common voltage, a step difference pattern on the first electrode, a second electrode on the step difference pattern, where the second electrode is electrically connected to the first electrode, a first light shielding unit spaced apart from the step difference pattern and having a first height, a second light shielding unit between the first light shielding unit and the step difference pattern, where the second light shielding unit has a second height, which is less than the first height, a second substrate opposing the first substrate, and a liquid crystal layer between the first substrate and the second substrate.