Liquid Crystal Display Subpixel Structure with Thin Film Transistor Resistor
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Solution Overview
Problem
Liquid crystal displays in vertically aligned mode face challenges in achieving high aperture ratio while maintaining side visibility similar to front visibility, often requiring additional thin film transistors or capacitors that reduce the aperture ratio.
Innovation Solution
A liquid crystal display configuration with a pixel structure that includes a first and second subpixel connected to thin film transistors and liquid crystal capacitors, where a thin film transistor resistor with controlled resistance is used to apply different voltages to each subpixel, improving lateral visibility by varying the voltage applied to the resistor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If additional thin film transistors or capacitors are used to improve side visibility in vertically aligned mode liquid crystal displays, then lateral visibility is improved, but the aperture ratio is reduced
Solution Approach 1:
The patent merges the functions of multiple thin film transistors into a single thin film transistor by introducing a thin film transistor resistor. The resistor is formed using the same amorphous silicon layer that serves as the semiconductor layer for the thin film transistor, allowing both components to share common structural elements and manufacturing processes. This integration eliminates the need for separate transistor structures while maintaining the dual-subpixel configuration needed for improved side visibility.
Solution Approach 2:
The thin film transistor resistor serves multiple functions: it acts as both a resistive element for voltage division and as part of the transistor structure itself. By using the amorphous silicon layer for both the transistor semiconductor and the resistor, the patent creates a multi-functional component that improves lateral visibility through voltage control while occupying minimal pixel area, thus preserving aperture ratio.
2Ease of manufacture
If subpixel configurations are used to achieve similar front and side visibility, then lateral display quality is improved, but device complexity increases
Solution Approach 1:
The patent simplifies the subpixel configuration by merging the control logic into a single thin film transistor that controls both subpixels through the resistor-based voltage division. Instead of requiring separate switching elements for each subpixel, the invention uses one transistor with a shared control signal, reducing the number of switching components while maintaining the ability to independently control subpixel voltages for improved lateral display quality.
Solution Approach 2:
The patent changes the electrical parameters within the pixel by introducing a resistor with specific resistance characteristics. The resistor value is carefully selected to achieve the desired voltage division ratio between subpixels, allowing lateral display quality improvement through parameter optimization rather than through increased structural complexity. The resistor transforms the voltage signal to create appropriate voltage levels for each subpixel.
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
The configuration enhances the aperture ratio and improves lateral visibility by ensuring the image observed from the side appears similar to the image from the front, addressing the limitations of existing subpixel configurations.
Implementation Method 1
a resistance of the thin film transistor resistor may be controlled by a voltage applied to the third electrode
Implementation Method 2
a first liquid crystal capacitor, wherein a first terminal of the first liquid crystal capacitor is electrically connected to the first thin film transistor
Implementation Method 3
An electric field is formed by applying a voltage to the electrodes on the substrates. The electric field changes the alignment of liquid crystal molecules in the liquid crystal layer and controls transmittance of light passing through the liquid crystal layer
Data Source
AI summary
A liquid crystal display includes a first gate line, a first data line, and a first pixel. The first pixel includes: a first subpixel including a first thin film transistor connected to the first gate line and data line, and a first liquid crystal capacitor, wherein a first terminal of the first liquid crystal capacitor is electrically connected to the first thin film transistor and a second terminal of the first liquid crystal capacitor is configured to receive a common voltage; and a second subpixel including a second thin film transistor connected to the first gate line and data line, a second liquid crystal capacitor, wherein a first terminal of the second liquid crystal capacitor is configured to receive the common voltage, and a thin film transistor resistor electrically connected between the second thin film transistor and a second terminal of the second liquid crystal capacitor.