Dual-Side Light Emitting Device Power Supply Segmentation
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Solution Overview
Problem
Existing light emitting devices face challenges in reliably maintaining a non-luminescent state on one panel while the other panel emits light, leading to power wastage and inefficiency, as the voltage in the capacitor varies due to leakage currents, making it difficult to ensure the non-emitting panel remains dark.
Innovation Solution
The light emitting device employs a driving circuit that sets the potential of the electric supply lines for each panel independently, ensuring the voltage between the electrodes of the light-emitting elements falls below or exceeds the threshold voltage based on whether an image is displayed on each panel, preventing electric current flow in the non-emitting elements and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common power supply line is used for both panels, then the device structure is simplified, but the non-emitting panel cannot be reliably kept in a non-luminescent state and power is wasted
Solution Approach 1:
The power supply system is segmented into separate first and second power supply lines, with the first power supply line dedicated to the first panel and the second power supply line dedicated to the second panel. This segmentation allows independent control of power supply to each panel, enabling the non-emitting panel to be reliably kept in a non-luminescent state by controlling its dedicated power supply line without affecting the emitting panel.
2Device complexity
If a common power supply line is used for both panels, then the circuit configuration is simplified, but power consumption increases due to current flow in the non-emitting panel
Solution Approach 1:
The power supply circuit is segmented into separate first and second power supply lines, allowing independent power management for each panel. This enables the non-emitting panel to be powered down or supplied with insufficient voltage to prevent current flow through its light-emitting elements, thereby reducing overall power consumption while maintaining a simplified circuit architecture.
3Stability of the object's composition
If the capacitor holds data voltage from previous light-emitting, then the pixel circuit maintains its state, but the driving transistor becomes electrically conductive causing unwanted current flow
Solution Approach 1:
The harmful effect of the capacitor holding residual data voltage is extracted and neutralized by applying insufficient voltage through the dedicated second power supply line to the non-emitting panel. This extraction approach prevents the residual voltage from causing unwanted current flow through the driving transistor and light-emitting elements, while the capacitor continues to maintain pixel circuit state stability.
4Power
If the voltage between power supply lines exceeds the light-emitting threshold, then the light-emitting element can emit light, but the non-emitting panel cannot be reliably kept dark
Solution Approach 1:
The power supply system is segmented into separate first and second power supply lines, enabling different voltage levels to be applied to each panel independently. The first power supply line can be set to provide sufficient voltage for light emission to the emitting panel, while the second power supply line is controlled to provide insufficient voltage to the non-emitting panel, ensuring reliable non-luminescent state control without compromising light-emitting capability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively reduces power consumption by ensuring the non-emitting panel remains in a non-luminescent state while the emitting panel operates, by controlling the switching elements and supply line potentials to prevent unnecessary current flow.
Implementation Method 1
voltage between both ends of the light-emitting element exceeds a light-emitting threshold voltage of the light-emitting element
Data Source
AI summary
A light emitting device includes a first substrate, a second substrate, a driving circuit, a first electric supply line, and a second electric supply line. In a case where while an image is displayed on the first substrate side, an image is not displayed on the second substrate side, the value of the potential which is supplied to the second electric supply line, to be a value where voltage between both ends of the second light-emitting element falls below the light-emitting threshold voltage. In a case where while an image is not displayed on the first substrate side, an image is displayed on the second substrate side, the value of the potential which is supplied to the first electric supply line, to be a value where voltage between both ends of the first light-emitting element falls below the light-emitting threshold voltage.