LED Display Data Compensation for Crosstalk Reduction
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Solution Overview
Problem
Crosstalk phenomenon in LED display devices due to unintentional self-capacitance and differences in luminous intensity slope caused by the number of simultaneously sourced data lines leads to image distortion.
Innovation Solution
An LED display device with a data compensation part that generates compensation data using a compensation value to adjust the driving data for each data line, based on the number of luminescence and non-luminescence data lines, to equalize luminous intensity slope, incorporating a pulse width modulation generator, current source, and pre-charging unit to control the sourcing time and voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple data lines are sourced simultaneously to increase brightness, then luminous intensity increases, but luminous intensity slope varies causing image distortion
Solution Approach 1:
The patent applies parameter changes by adjusting the sourcing time of data lines based on the number of simultaneously sourced lines. The compensation value is calculated using the formula (N-k)/N where N is total data lines and k is simultaneously sourced lines, dynamically changing the sourcing duration to compensate for capacitive effects and maintain uniform luminous intensity slope across different display conditions.
2Reliability
If data lines are sourced for longer time to compensate for capacitance, then charge loss is reduced, but luminous intensity slope difference increases causing crosstalk
Solution Approach 1:
The patent applies local quality by providing different sourcing times to different data lines based on their specific conditions. Each data line receives a customized compensation value calculated from the formula (N-k)/N, where the sourcing duration is locally adjusted according to the number of simultaneously sourced lines, ensuring each line is compensated appropriately without causing crosstalk to adjacent lines.
3Manufacturing precision
If compensation value is increased to equalize luminous intensity slope, then image distortion decreases, but sourcing time increases reducing display refresh efficiency
Solution Approach 1:
The patent applies partial action by providing compensation only when necessary - specifically when multiple data lines are sourced simultaneously. The compensation value (N-k)/N is calculated and applied selectively based on the actual number of sourced lines k, avoiding unnecessary extension of sourcing time when only one line is active, thus maintaining display refresh efficiency while correcting image uniformity issues when they occur.
Data Source
AI summary
A light-emitting diode (LED) display device includes a display part having LED elements arranged in a matrix structure including scan lines and data lines. The LED display device also includes a scan driver driving the scan lines and each of the scan lines is controlled using a discharge voltage at a discharge timing. The LED display device also includes a data compensation part which compensates driving data of each of the data lines to generate the compensation data of each of the data lines using a compensation value to compensate for a difference in luminous intensity slope of the LED element due to a difference in the number of luminescence data lines at the unit scan timing. Thus, a crosstalk phenomenon of the display image due to a difference in the number of data lines simultaneously sourced is decreased.