Oxide Pixel Circuit Segmented Scanning for Threshold Compensation
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Solution Overview
Problem
Display abnormalities occur due to insufficient threshold voltage compensation caused by the low mobility of oxide transistors in existing pixel circuits.
Innovation Solution
A pixel circuit design that includes a compensation control circuit, a data writing circuit, and a first energy storage circuit, where the compensation control circuit writes a reference voltage and the data writing circuit writes a data voltage independently, with the effective turn-on duration of the first scanning end being longer than the second scanning end to ensure adequate threshold voltage compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an oxide transistor is used in the pixel circuit, then the manufacturing process is simplified and device complexity is reduced, but the mobility of the transistor becomes too low to achieve adequate threshold voltage compensation
Solution Approach 1:
The pixel circuit is divided into separate functional modules: a compensation control circuit with a first scanning end for threshold voltage compensation, and a data writing circuit with a second scanning end for data writing. This segmentation allows independent optimization of each function, enabling adequate threshold voltage compensation time for oxide transistors while maintaining simplified circuit structure.
Solution Approach 2:
The compensation control circuit performs threshold voltage compensation in advance before the data writing circuit writes the data voltage. By conducting the compensation action preliminarily, the circuit ensures that the oxide transistor's threshold voltage is properly compensated before data writing, overcoming the low mobility limitation of oxide transistors.
2Productivity
If the compensation and data writing stages are combined in a single scanning process, then the scanning efficiency is improved, but the threshold voltage compensation time becomes insufficient for oxide transistors
Solution Approach 1:
The scanning process is segmented into two independent stages: a first scanning signal for the compensation control circuit and a second scanning signal for the data writing circuit. This segmentation allows each stage to have adequate time allocation, ensuring sufficient compensation time for oxide transistors while maintaining overall scanning efficiency through independent parallel operation.
Solution Approach 2:
The pixel circuit employs periodic scanning signals with different durations: the first scanning signal for compensation has a longer effective turn-on duration, while the second scanning signal for data writing has a shorter duration. This periodic action with differentiated time allocation ensures adequate compensation time while maintaining scanning efficiency.
3Reliability
If the effective turn-on duration of the first scanning end is made longer than the second scanning end, then adequate threshold voltage compensation is achieved for oxide transistors, but the circuit timing complexity increases
Solution Approach 1:
The scanning signal system is segmented into independently controllable first and second scanning ends with different effective turn-on durations. This segmentation allows the first scanning end to have a longer duration for adequate oxide transistor compensation, while the second scanning end maintains a shorter duration for efficient data writing, with each end controlled by independent scanning signals.
Data Source
AI summary
A pixel circuit includes a light-emitting element, a compensation control circuit, a data writing circuit, a driving circuit and a first energy storage circuit. The compensation control circuit writes a reference voltage into a control end of the driving circuit under the control of a first scanning signal. The data writing circuit writes a data voltage to the control end of the driving circuit under the control of a second scanning signal.