Oxide Semiconductor Transistor Pixel Structure for Liquid Crystal Alignment
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Solution Overview
Problem
Existing liquid crystal display devices face challenges in maintaining display quality and reducing power consumption while supporting high-resolution displays with efficient light usage.
Innovation Solution
The implementation of a display device design featuring a pixel structure with a switching element, including a transistor with an oxide semiconductor, where the transistor has a gate electrode and source/drain electrodes formed over a substrate, and a capacitor that transmits light, allowing for a high aperture ratio and efficient electric field control of liquid crystals, thereby reducing power consumption and improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional transistor structure is used in liquid crystal display devices, then the device complexity is reduced and manufacturing is easier, but power consumption increases and display quality deteriorates due to increased parasitic capacitance and reduced alignment control
Solution Approach 1:
The patent changes the material parameter of the transistor from conventional silicon-based semiconductors to oxide semiconductors (such as IGZO - indium gallium zinc oxide). This material parameter change reduces parasitic capacitance in the transistor structure, thereby reducing power consumption and improving display quality through better alignment control of liquid crystals, while maintaining a relatively simple device structure.
2Use of energy by moving object
If the aperture ratio is increased to improve light usage efficiency, then power consumption is reduced, but the control precision over liquid crystal alignment deteriorates
Solution Approach 1:
The patent employs oxide semiconductor transistors with fundamentally different electrical parameters (lower parasitic capacitance, different threshold voltage characteristics) compared to conventional transistors. This parameter change enables the transistor to maintain effective alignment control even when the aperture ratio is increased and electrode area is reduced, thus allowing both low power consumption and high alignment precision to coexist.
3Illumination intensity
If the electrode area is reduced to increase aperture ratio, then light usage efficiency improves, but parasitic capacitance increases and alignment control deteriorates
Solution Approach 1:
The patent changes the transistor material to oxide semiconductors, which inherently possess lower parasitic capacitance values. This material parameter change decouples the relationship between electrode area and parasitic capacitance, allowing the electrode area to be minimized for high aperture ratio without suffering from increased parasitic capacitance, thus enabling both high light usage efficiency and low energy loss.
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 enhances display quality by maintaining alignment of liquid crystals and reduces power consumption by increasing the period of alignment while reducing parasitic capacitance and alignment defects, enabling efficient light usage even in high-resolution displays.
Implementation Method 1
An electric field parallel to the substrate is generated by potentials supplied to the first electrode and the second electrode. The liquid crystal is driven by the electric field generated between the first electrode and the second electrode.
Implementation Method 2
reduces parasitic capacitance and alignment defects
Data Source
AI summary
A display device with low power consumption and high display quality is provided. The display device includes first and second electrodes. One pixel includes a region in which the distance between the first electrode and the second electrode is constant and a region in which the distance varies; this structure allows the switching operation of liquid crystal to start in a predetermined region, thereby improving the stability of the operation of the liquid crystal. A pixel region is divided into two regions in which the liquid crystals are aligned in the two respective directions when switching is performed, whereby viewing angle characteristics are improved. Furthermore, the supply of a potential to a third electrode suppresses alignment disorder of the liquid crystal and improves the display quality.