Liquid Crystal Display Light Blocking Metal Wire Slits
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Solution Overview
Problem
In liquid crystal display devices, the frame region tends to be brighter than the display region during black display due to insufficient light blocking, which affects the overall performance, especially with the demand for thinner structures that reduce polarizer size and intensity.
Innovation Solution
Incorporating a light blocking metal wire around the pixel region with slits to partially transmit light and a disconnection detection metal wire to enhance light blocking properties, while maintaining the same layer as the gate wire and using UV-curable seal material for bonding substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If polarizer size is reduced to achieve thinner structure, then device thickness is reduced, but light blocking property in frame region deteriorates
Solution Approach 1:
The frame region is segmented into multiple light blocking regions formed by metal wires arranged in a grid pattern, allowing each segment to contribute to overall light blocking without requiring a single large polarizer
Solution Approach 2:
Metal wires with specific optical properties are introduced as intermediary elements between the backlight and the liquid crystal panel, providing light blocking function without affecting the thin profile of the display device
2Length of moving object
If polarizer size is reduced to achieve thinner structure, then device thickness is reduced, but frame region brightness increases
Solution Approach 1:
The frame region is divided into multiple light blocking regions by metal wires, distributing the light blocking function across multiple segments to effectively reduce frame region brightness
Solution Approach 2:
Metal wires with specific optical blocking properties are placed locally in the frame region, providing targeted brightness control without affecting the overall display quality or requiring larger polarizers
3Object-affected harmful factors
If light blocking metal wire is added to enhance light blocking, then light blocking property improves, but device complexity increases
Solution Approach 1:
The light blocking metal wires are merged with the existing gate wire layer in the TFT substrate, combining multiple functions into a single structural element and avoiding additional manufacturing steps
Solution Approach 2:
The metal wire layer serves multiple functions: as gate wires for TFT operation, as light blocking structures in the frame region, and as conductive elements, thereby reducing overall device complexity despite enhanced light 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
The solution effectively increases light blocking in the frame region, ensuring better display performance by reducing backlight leakage and allowing UV curing of the seal material, while detecting disconnections in the TFT substrate to prevent defects.
Implementation Method 1
liquid crystal composition that varies transmittance of light by changing in alignment
Implementation Method 2
UV-curable seal material for bonding substrates
Data Source
AI summary
A liquid crystal display device includes a thin film transistor substrate having a pixel region and a frame region, and a color filter substrate. The frame region includes a first metal wire that surrounds the outside of the pixel region, and a second metal wire that is formed so as to surround the outside of the first metal wire. The first metal wire has at least one slit at an area overlapping with a seal material.