Display Device Dynamic Voltage Control Circuit
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Solution Overview
Problem
Existing organic EL display devices face challenges in achieving high definition and reducing power consumption while maintaining a simplified pixel circuit and peripheral circuit configuration, which is essential for cost and material efficiency.
Innovation Solution
A display device configuration that includes a driving transistor connected to a light-emitting element, a capacitor, and switches, with a control circuit managing voltages for different operational phases, allowing for reduced signal voltage writing and simplified circuitry, eliminating the need for additional signal lines and capacitors, thereby reducing power consumption and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional pixel circuit configuration with power lines and power line scanning circuit is used, then the display device can achieve basic driving function, but the pixel circuit and peripheral circuit become complex and power consumption increases
Solution Approach 1:
The patent merges the power supply function and signal writing function into a single signal line by dynamically controlling the voltage level. The same signal line serves as both power source (at higher voltage) and signal transmission path (at lower voltage), eliminating the need for separate power lines and reducing circuit complexity while lowering power consumption.
Solution Approach 2:
The patent employs dynamic voltage control where the signal line's voltage level is switched between a first voltage (power supply mode) and a second voltage (signal writing mode) based on operational timing. This dynamic switching allows the circuit to adapt its function, reducing the need for static dedicated power lines and simplifying the overall circuit architecture.
2Measurement precision
If additional power lines and power line scanning circuits are added to achieve high definition, then display quality improves, but device complexity and manufacturing cost increase
Solution Approach 1:
The signal line is designed to serve multiple functions: it acts as a power supply line when voltage is at the first level and as a signal transmission line when voltage is at the second level. This multi-functionality reduces the number of dedicated lines needed, simplifying the circuit while maintaining high definition capability through precise voltage control.
Solution Approach 2:
The patent changes the voltage parameter of the signal line dynamically to achieve different functions. By switching between first voltage (for power supply) and second voltage (for signal writing), the system achieves high definition display without requiring additional dedicated power lines, thus reducing circuit complexity and manufacturing cost.
3Use of energy by moving object
If signal voltage is written directly into capacitor without amplification, then power consumption reduces and circuit simplifies, but voltage level control becomes critical
Solution Approach 1:
The patent applies preliminary action by pre-charging the signal line to the first voltage level before writing the signal voltage into the capacitor. This preliminary voltage establishment ensures that the capacitor receives the correct voltage level without requiring amplification, reducing power consumption while maintaining reliable voltage control through timing-based sequencing.
Solution Approach 2:
The patent implements feedback control where the voltage level on the signal line is monitored and controlled to ensure proper charging of the capacitor. The control circuit adjusts the voltage timing and levels based on the operational state, ensuring reliable voltage writing into the capacitor without amplification, thus maintaining precision while reducing power consumption.
Data Source
AI summary
The present invention provides a display device having a driving transistor for current-driving a light-emitting element provided in each pixel, wherein the drain of the driving transistor is connected to a first power source, the source of the driving transistor is connected to the light-emitting element and one end of a capacitor, and the gate of the driving transistor is connected to a voltage source via a first switch and simultaneously therewith is connected to the other end of the capacitor via a second switch; the other end of the capacitor is further connected to a signal line via a third switch; and the display device has a control circuit for selectively controlling the first power source to a plurality of voltages.