Liquid Crystal Display Counter Voltage Signal Lines Opening Ratio
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Solution Overview
Problem
In liquid crystal display devices, the counter voltage signal lines, formed in the same layer as gate signal lines, occupy pixel regions and block light, limiting the opening ratio due to their metal material and light-blocking properties.
Innovation Solution
The counter voltage signal lines are formed using a transparent conductive film and a metal film in a multilayer structure, overlapping with gate signal lines and electrically connected via contact holes in an insulating film, allowing them to be positioned outside pixel regions and increasing the opening ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If counter voltage signal lines are formed in the same layer as gate signal lines using metal material, then electrical connection and reference signal supply are achieved, but light blocking occurs and opening ratio is reduced
Solution Approach 1:
The counter voltage signal lines are repositioned from the same plane (first substrate surface) to a different dimension (second substrate surface) by forming them on the opposite substrate. This spatial relocation allows the signal lines to avoid occupying pixel regions on the light transmission path, thereby increasing the opening ratio while maintaining electrical connection through the insulating film and contact holes.
Solution Approach 2:
An insulating film is introduced as an intermediary layer between the first substrate and the second substrate. This insulating film enables electrical connection between the counter voltage signal lines on the second substrate and the counter electrodes on the first substrate through contact holes, while allowing light to pass through unobstructed paths, thus resolving the conflict between electrical connectivity and light transmission.
2Reliability
If counter voltage signal lines are placed inside pixel regions to maintain electrical connection, then reference signal supply is ensured, but light blocking increases and opening ratio decreases
Solution Approach 1:
The counter voltage signal lines are relocated from the first substrate surface (where pixel regions exist) to the second substrate surface (opposite side). This dimensional transition removes the signal lines from the pixel region occupation zone, allowing light to pass through the pixel areas without obstruction, thereby increasing the opening ratio while maintaining reference signal supply through the insulating film connection.
3Reliability
If metal material is used for counter voltage signal lines, then electrical conductivity is improved, but light blocking properties increase
Solution Approach 1:
The light-blocking function is extracted and separated from the electrical conduction function by relocating the metal counter voltage signal lines to the second substrate surface. The metal material maintains its electrical conductivity role, while the light transmission path through the pixel regions is preserved by removing the metal lines from that spatial zone, allowing light to pass through without blocking.
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 enhances the opening ratio of pixels by preventing light blocking and reducing electrical resistance, thereby improving the display's efficiency and visual performance.
Implementation Method 1
the counter electrodes are formed of a transparent conductive film, the above described pixel electrodes are formed of a transparent conductive film
Implementation Method 2
on the liquid crystal side relative to the above described counter electrodes via an insulating film
Implementation Method 3
liquid crystal is driven between the pixel electrode and the counter electrode by means of an electrical field which includes a component parallel to the surface of the above described substrate
Data Source
AI summary
A liquid crystal display device including a liquid crystal panel including liquid crystal sealed between a pair of substrates; a plurality of gate signal lines and a plurality of drain signal lines formed to cross each other on one of said pair of substrates; a pixel region surrounded by a pair of adjacent gate signal lines and a pair of adjacent drain signal lines; a thin film transistor provided in the pixel region and connected to at least one of the pair of adjacent gate signal lines and at least one of the pair of drain signal lines; a pixel electrode provided in the pixel region and supplied with a video signal via the thin film transistor; and a counter electrode provided in the pixel region and supplied with a reference signal via a counter voltage signal line, the reference signal being a reference for the video signal.