Pixel Circuit Partial Region Refreshing OLED Power
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Solution Overview
Problem
Existing OLED display substrates require full-screen refreshing even for partial image updates, leading to high power consumption and low drive flexibility due to sequential scan signals from gate lines.
Innovation Solution
A pixel circuit with a data writing sub-circuit and a driving sub-circuit, where the data writing sub-circuit outputs a data signal to the control node only in response to a control signal and a scan signal, allowing only the pixel circuits in the target region to drive light-emitting elements to emit light, reducing unnecessary power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If full-screen refreshing is performed using sequential scan signals from gate lines, then all pixel circuits are updated, but power consumption increases and drive flexibility decreases
Solution Approach 1:
The pixel circuit is divided into a data writing sub-circuit and a driving sub-circuit with independent control. The data writing sub-circuit includes a first switch transistor controlled by a control signal and a second switch transistor controlled by a scan signal, allowing selective activation of only the driving sub-circuit for pixels requiring updates, while keeping other pixels in a low-power state.
Solution Approach 2:
The control signal is dynamically adjusted based on whether image updating is required. When no update is needed, the control signal maintains the first switch transistor in an off state, preventing data signal transmission and keeping the pixel in a low-power state. When an update is needed, the control signal activates the first switch transistor to allow data writing.
2Reliability
If full-screen refreshing is performed using sequential scan signals from gate lines, then all pixel circuits are updated, but drive flexibility decreases
Solution Approach 1:
The pixel circuit is divided into a data writing sub-circuit and a driving sub-circuit with independent control. The data writing sub-circuit includes a first switch transistor controlled by a control signal and a second switch transistor controlled by a scan signal, allowing selective activation of only the driving sub-circuit for pixels requiring updates, while keeping other pixels in a low-power state.
Solution Approach 2:
The control signal is dynamically adjusted based on whether image updating is required. When no update is needed, the control signal maintains the first switch transistor in an off state, preventing data signal transmission and keeping the pixel in a low-power state. When an update is needed, the control signal activates the first switch transistor to allow data writing.
3Measurement precision
If the data writing sub-circuit includes both switch portion and data writing portion with multiple transistors, then control precision improves, but device complexity increases
Solution Approach 1:
The data writing sub-circuit is segmented into a switch portion with first and second switch transistors, and a data writing portion. This segmentation allows independent control of signal transmission stages, enabling precise control over when and how data signals are written to the control node while maintaining a manageable circuit structure.
Data Source
AI summary
A pixel circuit, a display substrate, a display device and a driving method are provided. The pixel circuit includes a data writing sub-circuit and a driving sub-circuit, and the data writing sub-circuit is connected to a scan signal terminal, a control signal terminal, a data signal terminal and a drive sub circuit. The data writing sub-circuit is used to output a data signal from the data signal terminal to the control node in response to a control signal provided by the control signal terminal and a scan signal provided by the scan signal terminal. The driving sub-circuit is connected to the control node, a power signal terminal and a light-emitting element, respectively, and is used to drive the light-emitting element to emit light in response to a potential of the control node and a power signal provided by the power signal terminal.