Display Device Switching Transistor Floating State
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Solution Overview
Problem
Display devices with light-emitting elements face undesired emission during mobility correction periods due to increased potential in the current supply line, which affects the accuracy and quality of the displayed image.
Innovation Solution
A novel display device configuration that includes a pixel with a first switch, a transistor, a capacitor, and a light-emitting element, where a second switch is used to bring the source and drain of the transistor into an electrically floating state during the data voltage writing period, preventing an increase in the anode potential of the light-emitting element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the potential of the current supply line is increased to supply current to the light-emitting element for mobility correction, then the mobility correction function is achieved, but undesired emission from the light-emitting element occurs
Solution Approach 1:
The pixel circuit is segmented into multiple functional blocks with separate control switches. The second switch specifically controls the connection between the transistor and current supply line, allowing independent control of the correction period current supply without affecting other pixel operations. This segmentation enables precise timing control to prevent undesired emission while maintaining mobility correction functionality.
Solution Approach 2:
The second switch is turned off before the data voltage writing period begins, preliminarily establishing the electrically floating state for the transistor source/drain. This preliminary action prevents any potential increase in the anode potential before it occurs, thereby preventing undesired emission from happening in the first place while still allowing mobility correction to proceed.
2Object-generated harmful factors
If the second switch is turned off to bring the transistor source/drain into an electrically floating state, then undesired emission is suppressed, but the circuit complexity increases
Solution Approach 1:
The second switch serves multiple functions: it controls the electrically floating state during data writing, enables mobility correction current supply, and prevents undesired emission. By making this single component multi-functional, the patent avoids adding multiple separate components, thereby limiting the increase in circuit complexity while achieving multiple objectives.
Data Source
AI summary
A novel display device is provided. In a display device with a 2T1C circuit configuration, a switch is provided between a current supply line and a transistor. The switch is turned off in a data voltage writing period to bring one of a source and a drain of the transistor into an electrically floating state. This configuration can prevent a potential rise on the anode side of a light-emitting element, thereby suppressing undesired light emission in the data voltage writing period.