Display Device Sub-Pixel Electrode Common Gate Structure
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Solution Overview
Problem
Liquid crystal display (LCD) devices face challenges in improving aperture ratio and transmittance due to the size of the non-aperture area where thin film transistors are disposed, limiting their performance.
Innovation Solution
The design includes a display device with separately formed sub-pixel electrodes and thin film transistors connected through a common gate and source electrode structure, where a fraction of voltage applied to one drain electrode is applied to another, and the storage line adjusts voltage to optimize the voltage distribution across the transistors, reducing the non-aperture area and enhancing aperture ratio and transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the non-aperture area where thin film transistors are disposed is reduced, then the aperture ratio and transmittance are improved, but the device complexity increases due to the need for common gate and source electrode structures
Solution Approach 1:
The patent merges the gate electrode and source electrode into a common structure that is shared across multiple thin film transistors. The common gate electrode serves as the gate for multiple TFTs, and the common source electrode serves as the source for multiple TFTs, thereby reducing the total area required for transistor structures while maintaining functional independence.
Solution Approach 2:
The common gate electrode and common source electrode perform multiple functions simultaneously. The common gate electrode acts as the gate control element for multiple TFTs, and the common source electrode provides the source connection for multiple TFTs. This multi-functionality reduces the overall component count and area required in the display device.
2Area of stationary object
If separately formed sub-pixel electrodes are used with common gate and source electrodes, then the aperture ratio is improved, but the voltage distribution control becomes more complex
Solution Approach 1:
The pixel electrode is segmented into separately formed first and second sub-pixel electrodes, each connected to its own thin film transistor. This segmentation allows independent voltage control of each sub-pixel while sharing common gate and source electrodes, enabling precise voltage distribution control to optimize aperture ratio and transmittance.
Solution Approach 2:
The patent introduces a storage line that can dynamically adjust the voltage applied to the third drain electrode. This dynamic voltage adjustment capability allows the system to optimize voltage distribution across different transistors and sub-pixels in real-time, balancing the aperture ratio and transmittance performance.
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 reduces the non-aperture area, thereby improving the aperture ratio and transmittance of the display device, leading to enhanced performance and efficiency.
Implementation Method 1
Upon applying voltage to two electrodes, liquid crystal molecules of the liquid crystal layer are rearranged, thereby adjusting an amount of transmitted light.
Data Source
AI summary
A display device includes: a first substrate; a pixel electrode on the first substrate, the pixel electrode including separately formed first and second sub-pixel electrodes; a first thin film transistor (TFT) connected to the first sub-pixel electrode; a second TFT connected to the second sub-pixel electrode; a third TFT connected to one of the first and second TFTs; a gate line connected to the first, second, and third TFTs; a data line intersecting the gate line and respectively connected to the first and second TFTs; and a storage line, at least a part of the storage line spaced apart from and in parallel with the data line and connected to the third TFT. The first, second, and third TFTs may include a common gate electrode extending from the gate line.