Display Device V Line Inversion Driving for Uniformity
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Solution Overview
Problem
Existing display devices face challenges in maintaining high-quality display performance during non-display operations, such as touch input sensing, where power consumption is reduced, and uniformity issues arise due to capacitance between pixel electrodes and signal lines, leading to nonuniformity and vertical crosstalk.
Innovation Solution
The implementation of a display device with a matrix configuration of interconnects, switch elements, and a controller that performs V line inversion driving by inverting polarities between display and non-display intervals, and using pre-charge signals to stabilize potential differences, thereby reducing capacitance-induced nonuniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the display operation is paused to reduce power consumption during non-display operations, then power consumption is reduced, but display uniformity deteriorates due to capacitance between pixel electrodes and signal lines
Solution Approach 1:
The patent applies polarity inversion to the pixel signals during non-display operations. Specifically, when transitioning from display operation to non-display operation (such as touch sensing), the controller inverts the polarity of the pixel signals. This inversion counteracts the capacitance-induced charge accumulation between pixel electrodes and signal lines, preventing display uniformity degradation while maintaining low power consumption during the non-display interval.
2Manufacturing precision
If V line inversion driving is implemented by inverting polarities between display and non-display intervals, then display uniformity is improved, but device complexity increases due to additional control operations
Solution Approach 1:
The patent merges the polarity inversion operation with the existing display refresh cycle. The V line inversion driving is integrated into the conventional display timing structure, where polarity inversion occurs during the vertical blanking interval or non-display period. This merging approach allows the uniformity correction function to be added without requiring separate dedicated control circuits or operations, thereby limiting the increase in device complexity.
3Object-affected harmful factors
If pre-charge signals are used to stabilize potential differences, then vertical crosstalk is reduced, but signal line complexity increases
Solution Approach 1:
The patent implements pre-charge signals that are applied to pixel electrodes before the actual display signal is transmitted. These pre-charge signals establish a baseline potential level and stabilize the electrical environment in advance. By performing this charging action preliminarily during the non-display interval or before the active display period, the system reduces vertical crosstalk caused by potential differences without requiring continuous complex signal line management throughout the entire operating cycle.
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 ensures high-quality display performance even during non-display operations by minimizing vertical crosstalk and light leakage, maintaining uniformity and reducing power consumption.
Implementation Method 1
performs an optical operation of at least one of light emission or a change of an optical characteristic based on an electrical signal applied to each of the pixel electrodes
Implementation Method 2
performs an optical operation of at least one of light emission or a change of an optical characteristic based on an electrical signal applied to each of the pixel electrodes
Implementation Method 3
uniformity issues arise due to capacitance between pixel electrodes and signal lines
Implementation Method 4
V line inversion driving by inverting polarities between display and non-display intervals
Data Source
AI summary
According to one embodiment, a display device includes first, second, and third interconnects, switch elements, pixel electrodes, a display layer, and a controller. The switch elements are arranged in a matrix configuration, and connected to the first and second interconnects. The pixel electrodes are electrically connected to the switch elements. The third interconnects oppose the pixel electrodes. The display layer is provided on the pixel electrodes. The controller is electrically connected to the first, second, and third interconnects. The second interconnects include a first color interconnect. The controller performs a first operation of sequentially selecting the first interconnects and supplying a first color image signal to the first color interconnect. The controller performs a second operation of sequentially selecting the first interconnects and supplying a second color image signal to the first color interconnect. The controller performs a third operation being different from the first and second operations.