Organic EL Panel Voltage Control for Cost Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The cost of organic EL panel technology remains high compared to liquid crystal display (LCD) apparatuses, necessitating a reduction in production costs while maintaining image quality.
Innovation Solution
A panel configuration with a power supplying section that sets the power supply voltage to a low potential, ensuring the gate-source voltage of the driving transistor is higher than its threshold voltage by a factor of Q (≥2) within a one-field period, and includes a threshold value correction and mobility correction function to stabilize light emission, reducing the influence of transistor variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional organic EL panel designs are used, then image quality can be maintained, but production cost remains high
Solution Approach 1:
The patent applies parameter changes by modifying the power supply voltage characteristics - specifically setting the power supply voltage to low potential for a predetermined period to ensure the gate-source voltage exceeds the threshold voltage by Q times (Q≥2). This parameter optimization enables cost reduction while maintaining stable light emission and image quality
Solution Approach 2:
The patent implements periodic action through the power supplying section that periodically sets the power supply voltage to low potential during specific time intervals within each field period. This periodic voltage control stabilizes transistor operation and light emission while reducing manufacturing costs
2Ease of manufacture
If power supply voltage is optimized for cost reduction, then production cost decreases, but light emission stability may be affected
Solution Approach 1:
The patent employs feedback mechanisms through the power supplying section that monitors and adjusts the power supply voltage to maintain the gate-source voltage at Q times the threshold voltage. This feedback control ensures stable light emission while achieving cost reduction through optimized voltage parameters
3Reliability
If transistor variations are canceled through correction functions, then picture quality is stabilized, but device complexity increases
Solution Approach 1:
The patent merges the threshold value correction and mobility correction functions into the power supply control mechanism itself. By integrating these correction functions into the existing power supplying section rather than adding separate circuits, the patent stabilizes picture quality while minimizing increases in device complexity
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 configuration simplifies the panel design, reduces production costs, and maintains high picture quality by stabilizing light emission and canceling out transistor variations, thereby achieving a more cost-effective organic EL panel.
Implementation Method 1
The organic EL device utilizes a phenomenon that, if an electric field is applied to an organic thin film, then the organic thin film emits light
Data Source
AI summary
The present invention provides a panel, including: a plurality of pixel circuits disposed in rows and columns and each including a light emitting element for emitting light in response to driving current, a sampling transistor for sampling an image signal, a driving transistor for supplying the driving current to the light emitting element, and a storage capacitor for storing a predetermined potential; and a power supplying section configured to supply a power supply voltage of a high potential or a low potential at a time to all of the pixel circuits arranged in rows and columns; the power supplying section setting the power supply voltage to be supplied to the low potential, with which the gate-source voltage of the driving transistor becomes higher than a threshold voltage of the driving transistor, by Q times within a one-field period, Q being equal to or greater than 2.