Display Device Pixel Circuit Single Scan Signal Gate Line Control
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Solution Overview
Problem
Current display devices require multiple gate lines to control two switch elements, which limits the aperture ratio and efficiency of pixel control.
Innovation Solution
A display device design that allows control of two switch elements through a single scan signal, utilizing a pixel circuit with a driving element, a light emitting element, a first switch element, and a second switch element, where the scan signal voltage is adjusted during initialization and sensing periods to enable constant current sensing and improve mobility characterization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple gate lines are used to control two switch elements, then the control reliability is improved, but the aperture ratio deteriorates
Solution Approach 1:
The patent merges the control functions of two separate gate lines into a single gate line by using one gate line to control both the first switch element and the second switch element. This is achieved by configuring the first switch element's gate electrode and the second switch element's gate electrode to both be connected to the same gate line, thereby reducing the number of gate lines from two to one and increasing the aperture ratio while maintaining control reliability through dual-switch architecture.
2Manufacturing precision
If multiple gate lines are used to control two switch elements, then the switching control precision is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple gate line control functions into a single gate line that simultaneously controls both switch elements. This merging approach reduces the number of gate lines and associated connection structures, thereby simplifying the device architecture and reducing manufacturing complexity while maintaining precise switching control through the coordinated operation of the dual switch elements.
Solution Approach 2:
The single gate line is designed to perform multiple functions: it controls the first switch element during sensing periods and controls the second switch element during initialization periods. This multi-functional design allows one gate line to replace what would traditionally require two separate gate lines, reducing device complexity while maintaining switching precision through context-dependent control.
3Productivity
If a single scan signal controls two switch elements, then the productivity is improved, but the measurement precision deteriorates
Solution Approach 1:
The patent employs periodic action by using the single scan signal to alternately control different switch elements at different time periods. During sensing periods, the scan signal controls the first switch element to enable mobility sensing, while during initialization periods, the same scan signal controls the second switch element for initialization operations. This time-division multiplexing approach maintains sensing precision by dedicating specific time windows to sensing operations while improving productivity through efficient resource utilization.
Data Source
AI summary
A display device comprises a pixel circuit including a driving element having a gate electrode connected to a first node and a source electrode connected to a second node, a light emitting element connected to the second node, a first switch element that connects a data line and the first node, and a second switch element that connects a reference voltage line and the second node; a gate driver that supplies a scan signal to the gate line; and a sensing circuit that senses a voltage of the reference voltage line during a sensing period, wherein during an initialization period the scan signal is higher than the sensing data voltage, during the sensing period, the scan signal is higher than the first ground voltage and lower than the sensing data voltage, during the sensing period, a voltage of the second node is stored in a sensing capacitor.