LCD Subpixel Voltage Control via Gate-Modulated Resistor
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Solution Overview
Problem
The aperture ratio of liquid crystal displays (LCDs) is reduced due to thin film transistors and contact holes, which also affects side visibility when pixels are divided into subpixels with different transmittances.
Innovation Solution
Incorporating a resistor with a resistance semiconductor layer connected to thin film transistors, where the resistance is adjusted by a pulsed gate-on signal, allowing for different voltages to be applied to subpixels without additional transistors or contact holes, thereby maintaining high side visibility and preventing aperture ratio reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If one pixel is divided into two subpixels with different transmittances to improve side visibility, then side visibility is improved, but the aperture ratio is reduced due to additional thin film transistors and contact holes
Solution Approach 1:
The patent merges the resistor function into the existing thin film transistor structure by forming the resistor using the same semiconductor layer and electrode structures already present in the TFT. This integration eliminates the need for separate resistor structures and additional contact holes, thereby maintaining the aperture ratio while achieving different transmittances in subpixels for improved side visibility
Solution Approach 2:
The thin film transistor structure is designed to serve multiple functions: it acts as both the switching transistor and the resistor. By controlling the gate voltage, the same structure can operate in different resistance states, enabling the subpixel to achieve different transmittances without requiring additional dedicated resistor structures
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 solution enables side visibility to be comparable to front visibility while preventing a decrease in the aperture ratio by varying the resistance of the resistor with a pulsed gate-on signal, thus improving image quality without adding more transistors or contact holes.
Implementation Method 1
a resistor connected to the second thin film transistor and resistance of the resistor is changed by a pulsed gate-on signal applied to the gate line
Data Source
AI summary
A liquid crystal display includes a first substrate, a gate line and a data line disposed on the first substrate, a first thin film transistor and a second thin film transistor connected to the gate line and the data line, a first subpixel electrode connected to the first thin film transistor, a resistor connected to the second thin film transistor and a resistance of the resistor is changed by a pulsed gate-on signal applied to the gate line, and a second subpixel electrode connected to the resistor.