LCD Gate Line Width Variation for Aperture Ratio
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional liquid crystal display (LCD) devices face challenges in enhancing aperture ratio and transmittance ratio due to the non-display regions where thin film transistors (TFTs) are formed, leading to light leakage and reduced picture quality.
Innovation Solution
The solution involves forming two adjacent pixels to share a single gate line, with the gate line divided into regions of different widths, allowing two TFTs to be formed on the wider region and connected to adjacent pixel electrodes, and forming the common and pixel electrodes in a way that enhances light transmittance by altering the non-display regions into display areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TFTs are formed in each pixel region to enable active matrix driving, then switching control and image quality are improved, but aperture ratio and light transmittance are reduced due to non-display regions
Solution Approach 1:
Two adjacent pixel regions share a common gate line, merging the gate line function across pixel boundaries. This eliminates the need for separate gate lines in non-display regions, converting previously dead areas into usable display areas, thereby increasing the aperture ratio while maintaining TFT switching control
Solution Approach 2:
The gate line is designed with variable width along its length, creating first regions (wider) and second regions (narrower). This dimensional variation allows TFTs to be formed only in specific segments, optimizing the use of space and enabling non-display regions to be converted into display areas
2Ease of manufacture
If gate lines are formed with uniform width to simplify manufacturing, then manufacturing precision is improved, but aperture ratio is reduced due to excessive non-display regions
Solution Approach 1:
The gate line is designed with non-uniform width, having first regions with wider width and second regions with narrower width. This local variation in geometry allows TFTs to be formed only in the wider first regions, while the narrower second regions can be converted into display areas, thereby increasing aperture ratio without significantly complicating manufacturing
3Area of stationary object
If non-display regions are minimized to increase aperture ratio, then light transmittance is improved, but TFT formation and pixel control become difficult
Solution Approach 1:
The gate line width is locally optimized with wider first regions for TFT formation and narrower second regions for display purposes. This local quality variation ensures that TFTs can be properly formed in the wider regions while the narrower regions contribute to increased aperture ratio and light transmittance
4Adaptability or versatility
If conventional FFS mode with horizontal LC alignment is used to enhance viewing angle, then viewing angle is improved to 170°, but aperture ratio and transmittance ratio are reduced due to required non-display regions
Solution Approach 1:
Adjacent pixels share common gate lines, merging previously separate non-display regions into shared display areas. This eliminates the need for excessive non-display regions, thereby increasing transmittance ratio and aperture ratio while maintaining the FFS mode's wide viewing angle 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 configuration increases the aperture and transmittance ratios by converting dead regions into active display areas, thereby improving the overall picture quality and light transmission in LCD devices.
Implementation Method 1
a liquid crystal display (LCD) device which displays an image using optical anisotropy of a liquid crystal
Implementation Method 2
a common electrode and a pixel electrode formed on the first substrate, and forming an electric field
Data Source
AI summary
Disclosed is a liquid crystal display (LCD) device capable of enhancing an aperture ratio and a transmittance ratio. The LCD device includes a first substrate and a second substrate; a plurality of gate lines formed on the first substrate, each gate line having a first region and a second region with the width less than that of the first region; a plurality of data lines disposed so as to be perpendicular to the gate lines to define a plurality of pixel regions; a thin film transistor (TFT) formed on the first region of the gate line; a common electrode and a pixel electrode formed on the first substrate, and forming an electric field; a black matrix and a color filter layer formed on the second substrate; and a liquid crystal (LC) layer formed between the first substrate and the second substrate, wherein the first regions and the second regions of the gate lines are alternately disposed in an extending direction of the gate lines and in an extending direction of the data lines, and wherein two TFTs are formed on the first region of the gate line corresponding to the pixel region, two TFTS being respectively connected to pixel electrodes of two pixel regions adjacent to each other based on the gate line.