LCD Ion Overflow Prevention via Frame Electrode
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In liquid crystal display devices, the narrowing frame width allows ions to overflow into the display area, causing black stains due to decreased electrical resistance and affecting display quality, especially with the application of voltage to ion trap electrodes.
Innovation Solution
The design features a TFT substrate and counter substrate with a liquid crystal layer, where scanning lines and pixel electrodes are arranged to minimize ion accumulation by applying an AC voltage of reverse phase superimposed on DC voltage, and the organic passivation film is strategically omitted in through hole areas to reduce ion trapping and increase light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the frame width is narrowed to increase display area, then the display area is increased, but ions overflow into the display area causing black stains
Solution Approach 1:
The patent introduces a frame electrode as an intermediary component between the display area and the frame. This electrode applies voltage to create an electric field that acts as a barrier, preventing ions from overflowing into the display area while allowing the frame width to remain narrow for maximizing display area.
2Object-affected harmful factors
If voltage is applied to ion trap electrode to suppress ions, then ion accumulation is reduced, but display quality deteriorates due to influence on display area
Solution Approach 1:
The patent applies voltage selectively to specific regions using the frame electrode structure. By configuring the electrode to extend along the scanning line direction and applying voltage only in the frame region, it creates localized ion suppression without affecting the display area, thus maintaining display quality while preventing ion accumulation.
3Area of stationary object
If frame width is narrowed to increase display area, then display area is increased, but ions gathered in frame overflow into display area
Solution Approach 1:
The frame electrode serves as a mediator that stabilizes ion distribution by creating an electric field barrier. This prevents ions accumulated in the narrow frame region from overflowing into the display area, maintaining stable ion distribution while allowing narrow frame width for maximum display area.
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 prevents black stains by trapping ions and enhancing light transmittance, improving display quality and brightness without enlarging the display panel's outer dimensions.
Implementation Method 1
applying an AC voltage of reverse phase superimposed on DC voltage to the first scanning line and the second scanning line
Data Source
AI summary
The structure of the invention is: a pair of a first scanning line and a second scanning line extend in a first direction on the TFT substrate, a first pixel that has a first pixel electrode and a second pixel that as a second pixel electrode are formed between the pairs of the scanning lines, a connection area is formed between the first scanning line and the second scanning line; a first TFT, a first through hole that connects the first TFT with the first pixel electrode, and a second TFT, a second through hole that connects the second TFT with the second pixel electrode are formed in the connection area; the first pixel electrode and the second pixel electrode are formed on an organic passivation film; the organic passivation film is not formed in an area where the first through hole and the second through hole are formed.