PWM–PAM Pixel Driving Circuit for High-Density Transparent Displays
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Solution Overview
Problem
Conventional manufacturing processes and driving methods for display panels fail to meet the performance requirements of high pixel density and transparency, hindering further improvements in display panel performance.
Innovation Solution
A driving method for display panels that divides each frame into multiple consecutive display stages, utilizing pulse width modulation (PWM) and pulse amplitude modulation (PAM) signals to control pixel units, and employs a pixel driving circuit with thin-film transistors to enhance display performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional manufacturing processes and driving methods are used for display panels, then manufacturing simplicity is maintained, but pixel density and transparency performance deteriorate
Solution Approach 1:
The display frame is divided into multiple consecutive display stages, with each stage containing N subframes. This segmentation allows different control strategies (PWM for low grayscale, PAM for high grayscale) to be applied to different portions of the display content, enabling high pixel density achievement while managing manufacturing complexity through modular approach
Solution Approach 2:
The patent implements dynamic control by switching between PWM and PAM signaling modes based on grayscale requirements. The pixel driving circuit dynamically adjusts its operation mode within each display stage, allowing the system to adapt to different display requirements and achieve optimal performance without requiring complex manufacturing processes for all scenarios
2Manufacturing precision
If pixel density is increased in LED transparent screens, then display quality improves, but transparency deteriorates
Solution Approach 1:
The display operates with periodic display stages and subframes, where different control signals are applied in different time periods. This periodic structure allows the screen to maintain high pixel density for display quality while using transparent OLED technology and optimized driving waveforms to preserve transparency during non-emitting periods
Solution Approach 2:
The patent changes the signaling parameters dynamically - using PWM for low grayscale values and PAM for high grayscale values. This parameter change allows the display to achieve high pixel density and display quality while maintaining transparency by controlling when and how pixels emit light, rather than having all pixels continuously illuminated
3Manufacturing precision
If conventional driving methods are used, then system simplicity is maintained, but display performance at high pixel densities deteriorates
Solution Approach 1:
The driving method segments the display frame into multiple stages and subframes, with each segment receiving appropriate control signals. This segmentation enables high display performance at pixel densities up to 4K by applying optimized driving strategies to different portions of the display content
Solution Approach 2:
The pixel driving circuit is designed with multi-functionality to handle both PWM and PAM signaling modes within the same hardware architecture. This universal design achieves high display performance without requiring separate driving systems for different grayscale requirements, managing complexity through consolidated circuit design
Data Source
AI summary
A driving method for a display panel, a pixel driving circuit, and a display panel are provided. An image to be displayed is divided into multiple consecutive display stages, a first control signal is provided for 1st to (N−1)-th subframes, a second control signal is provided for the N-th subframe, and different pixel data structures are obtained for different display stages. A first control signal is a pulse width modulation (PWM) signal, and a second control signal is a pulse amplitude modulation (PAM) signal. Accordingly, the display performance is effectively enhanced.