TFT-LCD Array Substrate Segmented Pixel Electrodes
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Solution Overview
Problem
Conventional TFT-LCD array substrates experience feed through voltage issues, leading to discontinuity in the voltage difference applied across liquid crystal molecules between adjacent frames, affecting display quality due to the reduction in pixel electrode voltage.
Innovation Solution
The implementation of a TFT-LCD array substrate design with multiple gate lines and data lines, where each pixel region includes a first and second TFT, and pixel electrodes, allowing simultaneous control of display and common voltages to maintain equal voltage differences across liquid crystal molecules by sharing gate driving signals and forming individual second pixel electrodes in each region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional TFT-LCD array substrate design with single gate line and data line per pixel region is used, then the device complexity is low, but feed through voltage causes discontinuity in voltage difference across liquid crystal molecules between adjacent frames
Solution Approach 1:
The pixel region is segmented into two independent parts: a first pixel electrode controlled by a first TFT for display voltage, and a second pixel electrode controlled by a second TFT for common voltage. This segmentation allows independent control of voltage applied to liquid crystal molecules, enabling consistent voltage difference between adjacent frames while mitigating feed through effects.
Solution Approach 2:
The invention changes the voltage control parameters by introducing separate gate driving signals for the first and second TFTs. The first gate driving signal controls the display voltage on the first pixel electrode, while the second gate driving signal controls the common voltage on the second pixel electrode. This parameter change enables precise control of the voltage difference across liquid crystal molecules, maintaining consistency between frames.
2Ease of manufacture
If the pixel electrode voltage is reduced due to feed through voltage, then the manufacturing process is simple, but the display quality deteriorates due to discontinuity between frames
Solution Approach 1:
By segmenting the pixel region into two independently controllable parts with separate TFTs and electrodes, the invention maintains manufacturing simplicity while improving display quality. The segmented design allows the second pixel electrode to compensate for feed through voltage effects on the first pixel electrode, ensuring consistent voltage difference and preventing display discontinuity between frames.
3Device complexity
If a single pixel electrode is used per pixel region, then the device complexity is low, but the voltage difference applied on liquid crystal molecules becomes discontinuous between adjacent frames
Solution Approach 1:
The pixel region is divided into two independently controllable segments: a first pixel electrode for display voltage and a second pixel electrode for common voltage. This segmentation enables continuous and consistent voltage difference across liquid crystal molecules between adjacent frames by independently controlling each electrode through separate TFTs and gate driving signals.
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 design ensures consistent voltage differences across liquid crystal molecules between frames, enhancing display quality by preventing feed through voltage-induced discontinuities and maintaining desired voltage levels.
Implementation Method 1
The electric field parallel to the transparent substrate is generated between the pixel electrode and the common electrode, and the liquid crystal molecules rotate in the plane parallel to the transparent substrate under the above electric field
Implementation Method 2
The non-overlapping portion, between the pixel electrode and the common electrode forms liquid crystal capacitance, and the overlapping portion between the pixel electrode and the common electrode forms storage capacitance to maintain the voltage on the pixel electrode
Data Source
AI summary
A TFT-LCD array substrate, a manufacturing method thereof and a liquid crystal display panel are provided in the invention. The TFT-LCD array substrate comprises a plurality of first gate lines and a plurality of first data lines, and a plurality of pixel regions are defined by intersecting the first gate lines and the first data lines with each other. A first pixel electrode and a first TFT are formed in each of the pixel regions, and a second TFT and a second pixel electrode are further comprised in each of the pixel regions. The second TFT is connected with the second pixel electrode, the first pixel electrode and the second pixel electrode form the voltage difference to drive the reversion of the liquid crystal molecules, and the first TFT and the second TFT are turned on or off simultaneously.