LCD Subpixel Voltage Division via Segmented Lines
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Solution Overview
Problem
In liquid crystal displays, particularly in vertical alignment mode, the effective division of data voltage between sub-pixels is hindered by equal magnitudes of reference and storage voltages, leading to display quality deterioration such as luminance issues, especially as the display size increases due to non-uniform voltage application caused by increased wiring resistance.
Innovation Solution
The implementation of a liquid crystal display design where the storage voltage line and reference voltage line are not connected to each other, with separate signal compensation units for each, allowing independent control and maintenance of different magnitudes for these voltages, thereby ensuring uniform voltage application across the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the storage voltage line and reference voltage line are connected to each other to apply voltages of the same magnitude, then the circuit structure is simplified, but the data voltage cannot be effectively divided and display quality deteriorates
Solution Approach 1:
The patent divides the voltage application system into two independent parts: a storage voltage line connected to a storage capacitor and a reference voltage line connected to a reference capacitor. This segmentation allows independent control and optimization of each voltage line, enabling precise voltage division for data signals while maintaining separate reference and storage voltage levels, thus resolving the contradiction between circuit simplicity and voltage division precision.
2Area of stationary object
If the display size is increased, then the display area is enlarged, but the wiring length increases causing increased resistance and non-uniform voltage application
Solution Approach 1:
The patent introduces compensation capacitors as intermediary elements connected to each pixel electrode. These compensation capacitors, combined with the separated reference and storage voltage lines, act as local voltage regulation mechanisms that compensate for voltage drops caused by wiring resistance in large displays, ensuring uniform voltage application across the entire display area.
3Ease of operation
If different voltages are applied to two sub-pixels by dividing data voltage to improve side visibility, then side visibility is enhanced, but the magnitudes of reference and storage voltages become difficult to control independently
Solution Approach 1:
The patent implements independent voltage control by segmenting the voltage supply system into separate reference voltage and storage voltage lines, each with its own capacitor. This allows the data voltage to be effectively divided between sub-pixels for improved side visibility while maintaining independent control over reference and storage voltage magnitudes, preventing control complexity from escalating.
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 approach effectively prevents luminance deterioration and maintains the magnitudes of divided reference and storage voltages, enhancing side visibility while maintaining display quality by ensuring uniform voltage distribution and independent control of voltages.
Implementation Method 1
the LCD displays images by applying voltages to the field-generating electrodes to generate an electric field in the LC layer that determines the orientations of LC molecules therein to adjust polarization of light incident thereto
Implementation Method 2
adjust polarization of light incident thereto
Implementation Method 3
when the voltage applied to the wiring to apply a divided reference voltage and a storage voltage forming a storage capacitor
Data Source
AI summary
A liquid crystal display includes: a substrate; a gate line disposed on the substrate; a storage voltage line disposed on the substrate and extending substantially parallel to the gate line; a data line disposed on the substrate; a reference voltage line disposed on the substrate and extending substantially parallel to the data line; first and second subpixel electrodes disposed in a pixel area; a first switching element connected to the gate line, the data line, and the first subpixel electrode; a second switching element connected to the gate line, the data line, and the second subpixel electrode; and a third switching element connected to the second subpixel electrode and the reference voltage line, wherein the storage voltage line and the reference voltage line are not connected to each other.