Electroluminescent Pixel Circuit Reset Timing for Lower Power
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Solution Overview
Problem
Existing self-luminous display devices face challenges in reducing power consumption while maintaining luminance, as adjusting power supply voltage to reduce power consumption can lead to decreased luminance.
Innovation Solution
A display device configuration involving specific transistors and control signals to manage voltage supply, including a first transistor controlled by a second control signal, a second transistor between a first and second node, a third transistor between the second node and the gate electrode of the second transistor, and a fourth transistor supplying a reset voltage, with controlled signal transitions to manage data and reset voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If power supply voltage is adjusted to reduce power consumption, then power consumption is reduced, but luminance decreases
Solution Approach 1:
The pixel circuit is divided into multiple transistor components (first through fourth transistors) with distinct functions: data input, signal transmission, control, and reset. This segmentation allows independent optimization of each component's operation, enabling power consumption reduction through selective transistor control while maintaining luminance through coordinated voltage supply to the light emitting element.
Solution Approach 2:
The fourth transistor supplies a reset voltage to the second node and gate electrode of the second transistor before the light emitting element operates. This preliminary reset action ensures that the circuit is properly initialized, allowing subsequent power-saving operations to be performed without compromising the luminance output of the light emitting element.
2Use of energy by moving object
If multiple transistors and control signals are added to manage voltage supply, then power consumption can be optimized, but device complexity increases
Solution Approach 1:
The control signals serve multiple functions: they control transistor switching, manage voltage supply timing, and coordinate reset operations. The second control signal, obtained by shifting the first control signal, provides a universal control mechanism that synchronizes multiple transistors without requiring separate control circuits for each, thereby reducing overall circuit complexity while enabling sophisticated power management.
Solution Approach 2:
Multiple control functions are merged into a coordinated signal system where the first and second control signals work together to manage the operation of multiple transistors. The fourth transistor's reset function is combined with the data input function of the first transistor through synchronized control signaling, reducing the need for separate control circuits and simplifying the overall device architecture.
Data Source
AI summary
A display device includes a first transistor controlled using a second control signal obtained by shifting a first control signal and electrically connected a first node, a second transistor electrically connected between the first node and a second node, a third transistor controlled using the first control signal to which a third control signal has been shifted, and electrically connected between the second node and a gate electrode of the second transistor, and a fourth transistor electrically connected to the second node is controlled to supply a reset voltage to the second node and the gate electrode of the second transistor using the third control signal.