Pixel Circuit Layout With Integrated Scan Driving and Initialization
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Solution Overview
Problem
Existing light emitting display devices have complex circuit configurations that can lead to increased power consumption and reduced efficiency due to the need for multiple scan signals and driving circuits, which also occupy significant non-display area on the panel.
Innovation Solution
A simplified circuit configuration for light emitting display devices using a reduced number of scan signals and integrated gate driving circuits, reducing the number of transistors and capacitors per pixel, and optimizing the scan signal timing to enhance efficiency and reduce panel dead space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex circuit configuration with multiple scan signals and driving circuits is used, then the display device can provide complete pixel control functionality, but the power consumption increases and the non-display area occupied by driving circuits expands
Solution Approach 1:
The patent merges multiple scan driving circuits into a single integrated gate driving circuit that sequentially generates different scan signals (first scan signal for data input, second scan signal for compensation, third scan signal for initialization) through time-division multiplexing. This consolidation reduces the number of separate driving circuits, minimizing non-display area while maintaining complete pixel control functionality through coordinated signal timing.
Solution Approach 2:
The gate driving circuit is designed with multi-functionality to generate multiple types of scan signals (first, second, and third scan signals) using the same circuit structure and transistor components. By reusing the same physical transistors and circuit elements across different time periods to perform different functions, the patent reduces overall circuit complexity and component count while preserving comprehensive pixel control capabilities.
2Reliability
If multiple scan signals and driving circuits are used, then comprehensive pixel control is achieved, but the non-display area on the panel increases
Solution Approach 1:
The patent consolidates multiple separate scan driving circuits into one integrated gate driving circuit located in a single non-display region. This merging approach maintains all necessary pixel control functions through time-division multiplexing of scan signals, significantly reducing the total area occupied by driving circuits compared to having separate circuits distributed across the panel.
Solution Approach 2:
The patent transitions from spatial distribution of multiple driving circuits to temporal distribution of scan signals. Instead of having multiple circuits occupying different spatial areas simultaneously, the system uses a single circuit that generates different scan signals at different time periods, effectively moving the differentiation from the spatial dimension to the temporal dimension.
3Area of stationary object
If a simplified circuit configuration with reduced transistors and capacitors per pixel is used, then the non-display area is minimized, but the circuit functionality must be maintained through optimized signal timing
Solution Approach 1:
The patent employs periodic action by dividing the operation into distinct time periods: a first time period for data input using the first scan signal, a second time period for compensation using the second scan signal, and a third time period for initialization using the third scan signal. This periodic structure allows the simplified pixel circuit to perform multiple functions sequentially, maintaining complete functionality while minimizing the number of simultaneous circuit components needed.
Solution Approach 2:
The patent applies preliminary action by performing initialization of the pixel circuit in the third time period before the actual data display operation. The initialization scan signal pre-charges capacitors and sets transistor states in advance, ensuring the circuit is properly prepared for subsequent data input and display operations, thereby maintaining functionality with fewer components.
Data Source
AI summary
A pixel in a display device includes a light emitting element connected to a first power line, a first transistor connected between a cathode of the light emitting element and a second power line, a second transistor connected between a second node and a data line, a first capacitor connected between a first node and the second node, a third transistor connected between the first electrode of the first transistor and the first node, a second capacitor connected between the second node and the first power line, and a fourth transistor that initializes the second node in response to a second scan signal during an initialization period.