Electro-optical Device Dual Data Lines Vertical Crosstalk
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Solution Overview
Problem
In high-definition electro-optical devices, vertical crosstalk occurs due to voltage leakage through transistors, causing variations in gray-scale levels across columns, which lowers display quality.
Innovation Solution
The electro-optical device employs a configuration with pixels connected to both first and second data lines, where the data signal and inverted data signal have complementary voltage relationships, and auxiliary capacitors to ensure uniform voltage leakage, independent of displayed content, using a scanning line driving circuit and data line driving circuit to manage voltage polarity and supply signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a second transistor is added to reduce writing time, then productivity is improved, but vertical crosstalk occurs due to voltage leakage through the transistor in non-selection state
Solution Approach 1:
The data line is divided into two separate data lines (first data line and second data line) that are driven independently with inverted voltage signals. This segmentation allows the voltage leakage from the second transistor to be compensated by the complementary signal from the first data line, eliminating vertical crosstalk while maintaining the fast writing capability provided by the second transistor.
Solution Approach 2:
The data signal on the first data line is inverted relative to the second data line, creating a preliminary counteracting effect. When the second transistor leaks voltage during the holding period, the inverted signal on the first data line produces an equal and opposite leakage effect, canceling out the vertical crosstalk before it can affect display quality.
2Ease of operation
If the transistor is not completely turned off in non-selection state, then ease of operation is improved, but manufacturing precision deteriorates due to voltage leakage varying by column
Solution Approach 1:
By providing two data lines with inverted voltage relationships, the system creates equipotential conditions for voltage leakage across different columns. The complementary leakage effects from the two transistors ensure that all columns experience the same net voltage effect during the holding period, eliminating column-dependent gray-scale variations and achieving uniform display quality.
3Measurement precision
If higher definition display is implemented, then measurement precision is improved, but device complexity increases due to additional transistors and data lines
Solution Approach 1:
The first and second transistors serve dual functions: they enable fast voltage writing when activated, and provide complementary voltage leakage compensation during the holding period. This multi-functionality allows the pixel structure to achieve high-definition display capability without requiring additional compensation circuits or complex control mechanisms, thereby limiting the increase in device complexity.
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 eliminates vertical crosstalk, ensuring uniform gray-scale levels across columns and enhancing display quality by maintaining consistent voltage leakage, thereby preventing display irregularities.
Implementation Method 1
a pixel capacitor having a pixel electrode and a common electrode that is opposite to the pixel electrode
Implementation Method 2
An electro-optical device which performs display through an electro-optical change of liquid crystal or the like
Data Source
AI summary
An electro-optical device includes pixels that are provided to correspond to intersections of a plurality of rows of scanning lines and a plurality of pairs of first and second data lines; a scanning line driving circuit that selects the plurality of rows of scanning lines according to a predetermined sequence; and a data line driving circuit that supplies a data signal having a voltage according to a gray-scale level of each of pixels corresponding to the selected scanning line to the first data line, and supplies an inverted data signal obtained by inverting the data signal on the basis of a predetermined potential to the second data line. Each of the pixels has a pixel electrode; a common electrode that faces the pixel electrode; a first transistor that is turned on when a corresponding scanning line is selected to supply the data signal from the first data line to the pixel electrode; and a second transistor that is turned on when another scanning line different from the corresponding scanning line is selected prior to the corresponding scanning line, and supplies the inverted data signal from the second data line to the pixel electrode.