Auxiliary Capacitor for OLED Power Supply Potential Lowering
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Solution Overview
Problem
The power consumption of display apparatuses with organic electroluminescence (EL) panels increases due to the need for higher signal potentials during mobility correction, which affects the uniformity and luminance of the display.
Innovation Solution
A display apparatus and driving controlling method that includes a pixel array with an auxiliary capacitor connected between the light emitting element and the power supply line or scanning line of an adjacent pixel, allowing for temporary lowering of the power supply potential during mobility correction, thereby reducing power consumption and maintaining high emitted light luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If mobility correction is performed by gradually raising the source potential of the driving transistor, then uniformity of emitted light luminance is improved, but power consumption increases due to higher signal potentials being required
Solution Approach 1:
The auxiliary capacitor is pre-charged to a predetermined potential before mobility correction. During mobility correction, this pre-charged capacitor provides the necessary voltage to maintain uniform luminance without requiring higher signal potentials from the power supply, thus performing the corrective action in advance
Solution Approach 2:
The auxiliary capacitor acts as an intermediary element between the power supply line and the light emitting element. It temporarily stores and releases electrical energy during mobility correction, mediating the voltage requirements to achieve uniform luminance without increasing overall power consumption
2Use of energy by moving object
If the power supply potential is temporarily lowered during mobility correction, then power consumption is reduced, but the auxiliary capacitor requires precise potential management to maintain luminance uniformity
Solution Approach 1:
The power supply potential is dynamically changed during operation - lowered during mobility correction and restored to normal during light emission. The auxiliary capacitor's potential is also managed through controlled charging and discharging cycles, allowing the system to operate at lower average power while maintaining performance
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
The solution reduces power consumption while maintaining high emitted light luminance by adjusting the power supply potential during mobility correction, addressing the issue of increased power consumption and luminance dispersion across pixels.
Implementation Method 1
an auxiliary capacitor connected between an anode of the light emitting element and a power supply line or a scanning line for another pixel adjacent to the pixel in a direction of a column and retaining a predetermined potential
Implementation Method 2
a light emitting element having a diode characteristic and emitting light in response to a driving current
Data Source
AI summary
Disclosed herein is a display apparatus, including, a pixel array section including a plurality of pixels disposed in rows and columns, and a number of power supply lines and scanning lines equal to the number of the rows of the pixels, each of the power supply lines being wired commonly to those of the pixels which are juxtaposed in a direction of a row.