Display Pixel Driving Circuit Waveform Control for Afterimage Reduction
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Solution Overview
Problem
Existing display devices face challenges in achieving improved display quality, reduced power consumption, and minimizing afterimage effects, especially in high-speed driving environments.
Innovation Solution
The display device is driven in units of frames, with a pixel driving circuit comprising transistors and capacitors that adjust data signals and scan signals to control light-emitting diodes, using different waveforms and voltage levels in successive frames to manage grayscale values and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the same scan signal waveform is used in all frames, then the display device structure remains simple, but afterimage effects occur and display quality deteriorates
Solution Approach 1:
The scan signal waveform is made dynamic by adjusting its parameters (pulse width, amplitude) based on the data signal values and frame number. The waveform changes from static to adaptive, allowing optimization for different display conditions without hardware changes.
Solution Approach 2:
The patent changes parameters of the scan signal waveform (pulse width, amplitude) based on data signal characteristics. When data signal values are high, pulse width increases and amplitude adjusts accordingly, creating different waveforms for different frames to eliminate afterimage effects.
2Manufacturing precision
If higher voltage levels are used for data signals to improve display quality, then grayscale precision improves, but power consumption increases
Solution Approach 1:
The scan signal amplitude is dynamically adjusted based on the data signal voltage level. When data signals have high voltage levels, the scan signal amplitude is reduced, and when data signal voltage levels are low, the scan signal amplitude is increased, optimizing power consumption while maintaining grayscale precision.
Solution Approach 2:
The patent uses periodic scanning with frame-based timing, where scan signals are applied only during specific time windows within each frame. This periodic action allows the display to maintain precision while reducing overall power consumption by avoiding continuous high-voltage operation.
3Productivity
If the display device operates at high speed to improve productivity, then response time improves, but afterimage effects worsen
Solution Approach 1:
The scan signal waveform parameters are dynamically adjusted based on the frame number and data signal values, allowing the system to maintain high-speed operation while compensating for afterimage effects through adaptive waveform modification in each frame.
Solution Approach 2:
The patent implements feedback by using the frame number and data signal characteristics to determine the scan signal waveform parameters. This feedback mechanism allows real-time adjustment of scan signals to counteract afterimage effects during high-speed 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 display quality by minimizing afterimages and reduces power consumption while enabling high-speed operation.
Implementation Method 1
Each of the plurality of pixels includes a light-emitting element configured to emit light
Implementation Method 2
a light-emitting diode electrically connected to the pixel driving circuit... the light-emitting diode is configured to emit light having a first grayscale value in the first frame and the light-emitting diode is configured to emit light having a second grayscale value higher than the first grayscale value in the second frame
Data Source
AI summary
A display device is configured to be driven in units of frame and includes a pixel driving circuit electrically connected to a light-emitting diode. The pixel driving circuit includes a first transistor and a second transistor. The first transistor includes a second electrode electrically connected to the light-emitting diode, and a gate electrode electrically connected to a second node. The second transistor includes a first electrode configured to receive a data signal and a gate electrode configured to receive a second scan signal. The frame includes a first frame and a second frame, the data signal includes a first data signal provided in the first frame and a second data signal provided in the second frame, and the second scan signal provided in the first frame and the second frame may have different waveforms.