Transverse Electric Field LCD Pixel Electrode Overlap
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Solution Overview
Problem
Existing liquid crystal display devices of the transverse electric field type face limitations in widening the range of driving liquid crystal molecules and ensuring sufficient storage capacitance, leading to visual angle dependence and reduced aperture ratio.
Innovation Solution
The design includes a substrate with parallel data lines and perpendicular scan lines, featuring thin film transistors, an electric potential supply line, and storage capacitance electrodes, with pixel and common electrodes arranged to generate an electric field parallel to the substrate, allowing for wider liquid crystal molecule driving and increased storage capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a clearance is provided between the data line and the pixel electrode to prevent signal transmission delay, then the data signal transmission is reliable, but the range of driving liquid crystal molecules cannot be widened and the aperture ratio cannot be increased
Solution Approach 1:
The patent applies dimensionality change by moving the pixel electrode from the same plane as the data line to an upper layer, allowing the electrode to overlap with the data line in the vertical dimension. This eliminates the need for lateral clearance while maintaining electrical isolation through the insulating film, thereby increasing the aperture ratio without compromising signal transmission reliability.
Solution Approach 2:
The patent introduces an insulating film as an intermediary between the data line and the pixel electrode. This intermediary layer enables the pixel electrode to be positioned closer to or overlapping the data line while preventing electrical short-circuit and signal transmission delays, thus resolving the contradiction between reliability and aperture ratio.
2Device complexity
If the storage capacitance is generated on the short side of a pixel in structure, then the device complexity is reduced, but large area cannot be assured and sufficient storage capacitance cannot be assured
Solution Approach 1:
The patent utilizes the vertical dimension by positioning the storage capacitance electrode in an upper layer overlapping the scan line, separated by an insulating film. This three-dimensional arrangement allows the capacitance structure to occupy vertical space rather than lateral space, ensuring sufficient storage capacitance without increasing device complexity or requiring additional lateral area.
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 enables wider liquid crystal molecule driving and sufficient storage capacitance, improving the aperture ratio and transmissivity while reducing visual angle dependence and tone inversion.
Implementation Method 1
an electric field substantially parallel to a substrate formed between the pixel electrodes and the common electrode, the liquid crystal molecules are turned in a plane parallel to the substrate
Implementation Method 2
a liquid crystal display device of a transverse electric field type which performs display by rotating horizontal-aligned liquid crystals by a transverse electric field
Implementation Method 3
a storage capacitance electrode continued to the electric potential supply line, disposed above the scan line via an insulating layer, and generating capacitance between the scan line and itself
Data Source
AI summary
A transverse electric field-type liquid crystal display device displays by rotating homogeneous-aligned liquid crystals by a transverse electric field substantially parallel to a substrate, applied across a pixel electrode and a common electrode, assuring sufficient storage capacitance while enlarging the area of driving the liquid crystal molecules in a sub pixel. A source pixel electrode connected to a source electrode extends along the data line, a storage capacitance electrode formed by the same layer as the data line is formed above an adjacent scan line so as to overlap the adjacent scan line, the source pixel electrode is disposed so as to be connected to the storage capacitance electrode and a pixel along one side, an interlayer film is formed over the source pixel electrode, and a pixel electrode and a common electrode formed by a transparent conductive film are formed over the interlayer film.