Display Device Pixel Circuit Timing Control for Threshold Compensation
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Solution Overview
Problem
Existing display devices struggle to effectively manage threshold voltage compensation and bias voltage application across pixels, particularly at varying driving frequencies, which affects image quality and power efficiency.
Innovation Solution
The display device incorporates a pixel structure with specific transistor configurations and timing control mechanisms, including poly-silicon and oxide semiconductor transistors, to secure threshold voltage compensation time and periodically apply bias voltage, ensuring stable image display across different driving frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single scan driver is used for simple structure, then device complexity is reduced, but threshold voltage compensation time cannot be secured at varying driving frequencies
Solution Approach 1:
The scan driver is divided into multiple independent scan drivers (first scan driver for first scan lines, second scan driver for second scan lines, third scan driver for third scan lines). Each scan driver can independently control its respective scan lines with different timing, enabling threshold voltage compensation at varying driving frequencies while maintaining manageable system complexity through modular architecture.
Solution Approach 2:
The system dynamically adjusts the operating frequency of individual scan drivers based on driving conditions. The first scan driver operates at a first frequency, the second scan driver at a second frequency, and the third scan driver at a third frequency, allowing flexible adaptation to different image refresh rates and ensuring sufficient threshold voltage compensation time across varying operating conditions.
2Manufacturing precision
If multiple scan drivers with different frequencies are used to secure compensation time, then image quality is improved, but device complexity increases
Solution Approach 1:
The display panel is divided into multiple scan line groups, each controlled by a dedicated scan driver. This segmentation allows each driver to be optimized independently for its specific function (data writing, threshold voltage compensation, emission control) while maintaining overall system coordination through the timing controller, achieving high image quality without excessive complexity.
Solution Approach 2:
Each scan driver is designed to perform multiple functions: data signal writing, threshold voltage compensation, and emission control. The first scan driver handles data writing and threshold voltage compensation for first scan lines, the second scan driver handles threshold voltage compensation for second scan lines, and the third scan driver handles emission control, creating a universal multi-functional architecture that improves image quality while managing complexity.
3Stability of the object's composition
If threshold voltage compensation is performed at high frequency, then image stability is improved, but power consumption increases
Solution Approach 1:
Threshold voltage compensation is performed periodically at specific frequencies rather than continuously. The first scan driver operates at a first frequency for data writing, the second scan driver operates at a second frequency for threshold voltage compensation, and the third scan driver operates at a third frequency for emission control. This periodic action ensures image stability while minimizing power consumption by activating compensation only when necessary.
Data Source
AI summary
A pixel including a light emitting device, a first transistor including a first electrode connected to a first node electrically connected to a first power source, a second transistor connected between a data line and the first node and turned on in response to a first scan signal supplied to a first scan line, a third transistor connected between a third node connected to a second electrode of the first transistor and a second node and turned on in response to a second scan signal supplied to a second scan line, a fourth transistor turned on in response to a third scan signal, and a storage capacitor connected between the first power source and the second node, in which the second scan signal overlaps the first scan signal, and a width of the second scan signal is greater than twice a width of the first scan signal.