Metal Shielding Layer for LCD Crosstalk Reduction
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Solution Overview
Problem
In liquid crystal display devices, the electric field leakage between the signal line and the pixel electrode due to the slit formation causes crosstalk and streaks on the screen, degrading display quality.
Innovation Solution
A metal layer is formed along the slit between adjacent common electrodes, which blocks the electric field and prevents its leakage into the liquid crystal layer, while also blocking undesirable light from the backlight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a slit is formed to divide the common electrode into multiple electrodes, then the common electrode can be properly divided along signal lines, but an electric field is produced between the signal line and pixel electrode that leaks into the liquid crystal layer causing crosstalk and streaks
Solution Approach 1:
A metal layer is introduced as an intermediary element between the signal line and the liquid crystal layer. This metal layer acts as a shield that intercepts and blocks the electric field lines, preventing them from reaching the liquid crystal layer and causing crosstalk or streaks, while allowing the slit structure to maintain its electrode division function
Solution Approach 2:
The metal layer is positioned in advance to counteract the harmful electric field before it can leak into the liquid crystal layer. By placing the conductive metal layer between the signal line and liquid crystal, the electric field is blocked proactively, preventing the formation of crosstalk and streaks before they occur
2Object-affected harmful factors
If a metal layer is added to block electric field leakage, then crosstalk and streaks are prevented, but the device structure becomes more complex
Solution Approach 1:
The metal layer is merged with existing electrode structures or integrated into the same fabrication process as other conductive layers in the display device. By combining the shielding function with existing structural elements rather than adding completely separate components, the increase in structural complexity is minimized while maintaining the electric field blocking capability
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 solution effectively prevents electric field leakage and light interference, enhancing display quality by reducing crosstalk and maintaining accurate color representation and image contrast.
Implementation Method 1
A metal layer is formed on the interlayer insulating film, arranged in contact with at least one of the common electrodes adjacent to each other via the slit, and covering at least a part of the slit. The metal layer is at least partly opposed to the signal line located in correspondence with the slit and is arranged closer than the signal line to the liquid crystal layer.
Implementation Method 2
A metal layer is formed along the slit between adjacent common electrodes, which blocks the electric field and prevents its leakage into the liquid crystal layer, while also blocking undesirable light from the backlight.
Data Source
AI summary
According to one embodiment, a liquid crystal display device includes a first substrate, a second substrate and a liquid crystal layer. The first substrate includes a metal layer formed on an interlayer insulating film, arranged in contact with at least one of common electrodes adjacent to each other via a slit, and covering at least a part of the slit. The metal layer is at least partly opposed to a signal line located in correspondence with the slit and is arranged closer than the signal line to a liquid crystal layer.