Display Pixel Reset Line Potential Control
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Solution Overview
Problem
High-definition display devices face challenges in completing initialization operations within the limited time required for transitioning display elements to a non-display state, leading to potential failures in image signal writing operations and variations in display quality, particularly noticeable at the edge of the screen.
Innovation Solution
The proposed solution involves setting the reset line potential to a second reset potential lower than the first reset potential before starting the image signal writing in the first row, ensuring quick reduction of the drive transistor's source potential and maintaining uniform conditions across all rows for accurate image signal writing, thereby ensuring reliable initialization and consistent display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the reset line potential is lowered to initialize pixels quickly, then the initialization speed is improved, but the drive transistor may enter cutoff state causing image signal writing failures
Solution Approach 1:
The reset line potential is lowered in advance before image signal writing begins, ensuring that pixel initialization is completed beforehand. This preliminary action prevents initialization delays during the writing process while controlling the timing to avoid drive transistor cutoff, thereby resolving the contradiction between initialization speed and writing reliability.
Solution Approach 2:
The reset line potential is dynamically adjusted based on the operational phase: lowered to a second reset potential during initialization to accelerate pixel reset, then raised to a first reset potential before image signal writing to prevent drive transistor cutoff. This dynamic adjustment enables both fast initialization and reliable writing.
2Reliability
If the reset line potential is held at a high level during image signal writing, then the drive transistor remains in active state ensuring accurate writing, but the initialization operation cannot be completed within the limited time
Solution Approach 1:
The reset line potential operates in periodic phases: first lowered to the second reset potential to enable rapid pixel initialization, then raised to the first reset potential to ensure accurate image signal writing. This periodic switching between potential levels allows both fast initialization and accurate writing to occur in sequence within the overall frame time.
Solution Approach 2:
Pixel initialization is performed as a preliminary operation before image signal writing by lowering the reset line potential in advance. This ensures that all pixels are properly initialized within the limited time budget before the writing phase begins, preventing initialization delays from affecting writing accuracy.
3Ease of operation
If sequential row-by-row image signal input is used, then the writing operation is simplified, but the initialization must be completed very quickly causing potential failures
Solution Approach 1:
The reset line potential is lowered in advance before the sequential row-by-row writing operation begins, ensuring that pixel initialization is completed beforehand. This preliminary initialization action provides sufficient time for all pixels to be reset before writing starts, preventing initialization failures while maintaining the simplicity of sequential writing.
Solution Approach 2:
The reset line potential is dynamically lowered to a second reset potential during the initialization phase to accelerate the reset process, then raised to a first reset potential before sequential writing begins. This dynamic adjustment ensures fast initialization within the limited time budget while maintaining simple sequential row-by-row writing 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 allows for reliable initialization operations and high-quality display images by ensuring that all pixels are uniformly prepared for image signal writing, reducing the likelihood of display failures and maintaining consistent luminance across the screen.
Implementation Method 1
a display element having a first electrode electrically connected to the driving transistor and emitting light by a current supplied through the drive transistor
Data Source
AI summary
A display device is provided. The display device includes a display region. The display region has a plurality of pixels. Each of the plurality of pixels comprises a switching transistor having a gate electrically connected to a scanning line and controlling the input of an image signal provided from a signal line, a drive transistor input with the image signal through the switching transistor and controlling a current value based on the image signal, a display element having a first electrode electrically connected to the driving transistor and emitting light by a current supplied through the drive transistor, a storage capacitor having a first electrode electrically connected to a gate of the drive transistor, and a reset transistor connected between the first electrode of the display element and a reset line, and having a gate electrically connected to the scanning line.