Passive Matrix LED Display Sub-Area Segmentation for Crosstalk Reduction
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Solution Overview
Problem
Passive matrix LED display devices experience crosstalk due to excessive forward leakage current, leading to reduced resolution, which is typically addressed by lowering the display resolution rather than eliminating the issue.
Innovation Solution
The display device is divided into sub-display areas with a data induction coil and switch layers, allowing for selective LED activation through column and row switches, forming a closed loop to generate an induced current and prevent crosstalk while maintaining high resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If passive matrix LED display device drives selected column of LEDs with large forward current, then luminance is improved, but forward leakage current causes crosstalk
Solution Approach 1:
The display device is divided into multiple sub-display areas, with each sub-display area containing a subset of LEDs that can be independently controlled. This segmentation allows the forward current to be distributed across multiple smaller groups rather than driving a large column simultaneously, reducing the forward leakage current and crosstalk while maintaining adequate luminance in each segment
Solution Approach 2:
The patent implements dynamic control of LED groups through column switches and row switches that selectively activate different subsets of LEDs in different time periods. By dynamically switching between different LED groups rather than driving all LEDs in a column simultaneously, the system reduces peak forward leakage current and prevents crosstalk while maintaining overall luminance through time-multiplexed operation
2Measurement precision
If resolution is increased in PM LED display device, then display quality is improved, but forward leakage current increases causing crosstalk
Solution Approach 1:
The display is segmented into sub-display areas with fewer LEDs each, allowing high resolution to be achieved through the array of segments rather than through large individual LED columns. This segmentation reduces the number of LEDs driven simultaneously in each segment, thereby reducing forward leakage current and crosstalk while maintaining high overall resolution through the combined array
Solution Approach 2:
The patent uses periodic scanning of different sub-display areas and LED groups through time-multiplexed control. By periodically activating different segments in sequence rather than all at once, the system achieves high resolution display capability while keeping the forward leakage current in any given segment low enough to avoid crosstalk
3Area of stationary object
If large-area PM LED display device is used, then display coverage is improved, but forward leakage current increases causing crosstalk
Solution Approach 1:
The large-area display is divided into multiple sub-display areas distributed across the display surface. Each sub-display area contains a manageable number of LEDs that can be controlled independently. This segmentation allows the display to cover large areas while keeping the forward leakage current in each segment low enough to prevent crosstalk, as not all LEDs across the entire large area are driven simultaneously
Solution Approach 2:
The system dynamically controls different sub-display areas at different time periods, activating only the necessary segments for current display requirements. This dynamic activation pattern allows large display coverage while reducing peak forward leakage current by limiting the number of LEDs active in any given moment across the large 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 approach effectively disperses forward leakage current, avoiding crosstalk and enabling high-resolution displays without the need for reducing resolution.
Implementation Method 1
A portion of the data line is formed as a data induction coil to receive one of the data signals by wireless sensing
Implementation Method 2
The selected LED is coupled to the data line to form a closed loop. The closed loop generates an induced current according to one of the data signals
Data Source
AI summary
A display device is provided. The display device includes a data signal transmitter and a display panel. The data signal transmitter is used to transmit data signals. A display area of the display panel is divided into sub-display areas. Each sub-display area includes light emitting diodes, a data line, column switches, and row switches. A portion of the data line is formed as a data induction coil to receive one of the data signals by wireless sensing. The display panel selects one of the light emitting diodes as a selected light emitting diode by the column switches and the row switches. The selected light emitting diode is coupled to the data line to form a closed loop. The closed loop generates an induced current according to the data signal and causes the selected light emitting diode to emit light according to the induced current.