Display Data Driver With Alternating Black-Data Duty Control
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Solution Overview
Problem
Existing duty drive methods for LEDs in display devices face limitations in lowering the duty rate of light-emitting elements, leading to high power consumption and peak current magnitude.
Innovation Solution
A data driver that alternately outputs image data voltage and black data voltage at different timings at predetermined intervals, reducing the duty rate of the light-emitting elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If duty drive is implemented by increasing driving speed or frequency to sequentially apply image data voltage and black data voltage, then the emission efficiency of LEDs is improved, but the duty rate of the light-emitting element cannot be lowered sufficiently
Solution Approach 1:
The patent implements periodic action by alternately outputting image data voltage and black data voltage at predetermined time intervals through a selection circuit. This periodic switching enables the light-emitting elements to operate in pulse mode rather than continuous mode, thereby reducing the duty rate while maintaining emission efficiency. The control circuit generates timing signals that periodically switch the selection circuit between connecting the image data voltage from the output circuit and connecting the black data voltage, creating a pulsed driving pattern that lowers overall power consumption.
2Productivity
If high current is applied for short time to improve emission efficiency, then LED performance is enhanced, but peak current magnitude increases leading to higher power consumption
Solution Approach 1:
The periodic action principle is applied by implementing duty drive that alternates between image data voltage and black data voltage at optimized time intervals. This creates pulsed current flow that maintains high emission efficiency during active periods while allowing the current to drop to zero or near-zero during black periods, thereby reducing the average peak current magnitude and overall power consumption compared to continuous high-current driving.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the timing and duration of image data voltage and black data voltage application. The control circuit modifies the duty cycle parameters (on-time and off-time durations) to optimize the balance between emission efficiency and power consumption. By changing these temporal parameters, the system achieves low-power operation while maintaining adequate brightness output.
Data Source
AI summary
A data driver according to an embodiment and a display device including the same are disclosed. The data driver includes an output circuit configured to output a pixel data as an image data voltage in analog form; a selection circuit configured to connect one of an output end of the output circuit and a wire to which a black data voltage is applied to a data line; and a control circuit configured to control the selection circuit so that the image data voltage and the black data voltage are alternately output at a predetermined time interval.