Display Module PWM Sweep Signal Reduces Peak Current
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Solution Overview
Problem
Inorganic light-emitting display panels face challenges in maintaining color reproducibility due to wavelength changes with driving current magnitude, leading to increased peak power consumption and design restrictions.
Innovation Solution
A display module employing pulse width modulation (PWM) to control light emission in sub-pixels, where a sweep signal is applied between two voltages to reduce peak current and power consumption by sequential light emission in row line sequences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If inorganic LED is driven with high magnitude current to increase brightness, then illumination intensity is improved, but wavelength changes causing color reproducibility to deteriorate
Solution Approach 1:
The patent applies pulse width modulation (PWM) to drive the inorganic LED, switching the current on and off periodically rather than using continuous high current. This allows the LED to operate at high brightness during the on-period while avoiding the wavelength shift that occurs with sustained high current, thereby maintaining color reproducibility while achieving high illumination intensity.
Solution Approach 2:
The patent dynamically adjusts the driving current magnitude based on the required gray scale level rather than using a fixed high current. By adapting the current level to the specific display requirements, the system achieves the necessary brightness while minimizing wavelength variation and preserving color accuracy.
2Illumination intensity
If inorganic LED is driven with high magnitude current to increase brightness, then illumination intensity is improved, but peak power consumption increases
Solution Approach 1:
The PWM driving method switches the current in periodic pulses rather than maintaining continuous high current. This reduces peak power consumption because the high current flows only during the on-period of the pulse, while the off-period allows power to drop to near zero, achieving the same average brightness with lower peak power requirements.
3Illumination intensity
If inorganic LED is driven with high magnitude current to increase brightness, then illumination intensity is improved, but design restrictions increase
Solution Approach 1:
By using PWM to drive the LED with periodic pulses instead of continuous high current, the patent reduces peak power demands and thermal management requirements. This simplifies the overall design by reducing the complexity of power supply circuits, heat dissipation structures, and current regulation mechanisms that would be needed to support sustained high-current operation.
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 enhances color reproducibility and reduces peak power consumption, minimizing design constraints and power supply requirements.
Implementation Method 1
drive the display panel to emit light in a row line sequence based on the set PWM data voltage
Data Source
AI summary
A display module includes a display panel in which a plurality of pixels each including a plurality of sub-pixels are disposed on a plurality of row lines; and a driver. The driver is configured to set a PWM data voltage to the plurality of sub-pixels included in the plurality of row lines in a row line sequence, apply a sweep signal, which is a voltage signal sweeping between two different voltages, to sub-pixels among the plurality of sub-pixels that are included in at least some consecutive row lines among the plurality of row lines in the row line sequence, and drive the display panel to cause the sub-pixels included in the at least some consecutive row lines to emit light based on the PWM data voltage in the row line sequence.