TFT Substrate Aperture Ratio via Central Reflection Region
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Solution Overview
Problem
Transflective liquid crystal displays (LCDs) face aperture ratio reduction due to the division of transmission regions, leading to irregular liquid crystal alignment and image distortion in the bridge region between divided domains.
Innovation Solution
A TFT substrate design where a reflection region is formed at the center of the pixel region, with transmission regions symmetrically arranged around it, eliminating the need for a bridge and enhancing the aperture ratio by positioning gate and storage lines within the reflection region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the transmission region is divided into two regions to operate in PVA mode, then wide viewing angle is achieved, but the aperture ratio is reduced due to the bridge region spacing
Solution Approach 1:
The harmful bridge region connecting the two transmission regions is removed entirely. Instead of having two separate transmission regions that need to be bridged, the invention uses a single continuous transmission region, eliminating the aperture loss associated with bridge spacing while maintaining PVA mode operation capabilities
Solution Approach 2:
Instead of dividing the transmission region into two separate areas and connecting them with a bridge, the invention inverts the approach by using one unified transmission region. This reverses the conventional structure and eliminates the need for bridge regions, thereby maintaining high aperture ratio while achieving wide viewing angle through proper liquid crystal alignment
2Adaptability or versatility
If a bridge region is formed to connect divided transmission domains, then PVA mode operation is enabled, but liquid crystals in the bridge region are irregularly aligned causing image distortion
Solution Approach 1:
The problematic bridge region that causes irregular liquid crystal alignment and image distortion is completely removed from the structure. The invention achieves PVA mode operation through a single continuous transmission region without requiring any bridging structure, thereby eliminating the source of image quality degradation
Solution Approach 2:
The invention maintains uniform liquid crystal alignment across the entire transmission region by avoiding the bridge region structure. This homogeneity in liquid crystal orientation ensures consistent optical properties and prevents the irregular alignment that would otherwise occur in bridge areas, guaranteeing reliable image display
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 prevents aperture loss and maintains uniform liquid crystal alignment, ensuring a stable image display without the need for a bridge region, thus improving the overall aperture ratio and display quality.
Implementation Method 1
The LCD displays an image by controlling the alignment of liquid crystal molecules, which is done by applying voltages to the pixel electrode and the common electrode. The amount of light transmitted through a liquid crystal layer is adjusted by the alignment of the LC molecules.
Implementation Method 2
The transflective LCD, however, operates in a reflection mode when there is enough ambient light.
Data Source
AI summary
A thin film transistor (TFT) substrate that is capable of providing a wide viewing angle and high contrast ratio without a decrease is aperture ratio is presented. The TFT substrate may be, for example, used with a patterned vertical alignment (PVA) mode LCD. The TFT substrate includes gate lines and data lines extending in non-parallel directions and a pixel electrode formed in a pixel region. The pixel region has two transmission regions separated from each other by a reflection region, and at least one of the gate lines is formed in the reflection region. A storage capacitor may also be formed in the reflection region. This configuration avoids the use of a bridge region between the two transmission regions that is responsible for aperture ratio decrease in the conventional configuration.