Polygonal Common-Electrode Slits for Fine-Pixel LCD Transmittance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices face challenges in achieving higher transmittance while maintaining high definition by making pixels finer, as this often results in reduced transmittance due to equally small liquid crystal domains around slits.
Innovation Solution
The display device incorporates a common electrode with a polygonal-shaped slit that overlaps both pixel electrodes and regions without pixel electrodes, along with a liquid crystal layer and specific electrode configurations to stabilize liquid crystal domains, ensuring high definition and improved transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pixels are made finer for higher definition, then definition is improved, but transmittance is reduced
Solution Approach 1:
The common electrode is designed with a slit structure where only specific portions overlap with the pixel electrodes, creating localized electric fields. This selective overlap allows the electrode to function effectively for driving liquid crystal molecules while minimizing light blocking areas, thereby maintaining high transmittance even when pixels are made finer for higher definition.
Solution Approach 2:
The common electrode is divided into multiple slits rather than being a continuous structure. Each slit is positioned to overlap with specific pixel electrodes, segmenting the electrode's function across multiple discrete locations. This segmentation reduces the total area blocking light while maintaining effective electric field generation for driving the liquid crystal display.
2Speed
If four liquid crystal domains are generated around two openings for higher response speed, then response speed is improved, but transmittance is reduced when pixels are made finer
Solution Approach 1:
The slit structure creates localized electric field regions that generate liquid crystal domains only where needed for driving performance. By positioning slits to overlap with pixel electrodes in specific patterns, the design achieves effective domain generation for response speed while minimizing light blocking in non-critical areas.
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 allows for higher definition and increased transmittance by stabilizing liquid crystal domains, even as pixel size decreases, maintaining image clarity and brightness.
Implementation Method 1
a liquid crystal layer including liquid crystal molecules between the array substrate and the counter substrate
Implementation Method 2
An end of each of the pixel electrodes overlaps the opening of a corresponding one of the pixels. A slit of the common electrode has a polygonal shape. In the opening of each of the pixels, a first part of the slit of the common electrode overlaps the pixel electrode, and a second part of the slit of the common electrode overlaps a region not provided with the pixel electrode.
Data Source
AI summary
According to an aspect, a display device includes an array substrate, a counter substrate, and a liquid crystal layer including liquid crystal molecules. The array substrate includes signal lines arrayed in a first direction, scanning lines arrayed in a second direction, pixel electrodes disposed respectively in openings of pixels, semiconductors provided respectively to the pixels, and a common electrode overlapping the pixel electrodes with an insulating film interposed therebetween. An end of each pixel electrode overlaps the opening of a corresponding one of the pixels. A slit of the common electrode has a polygonal shape. In the opening of each pixel, a first part of the slit overlaps the pixel electrode, and a second part of the slit overlaps a region not provided with the pixel electrode.