OLED Display Driving Method for Signal Line Protection
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Solution Overview
Problem
As the size of organic light emitting diode (OLED) display panels increases, the width of signal transmitting lines at the panel lead-in portion decreases, leading to increased resistance and peak current, which can damage the signal transmitting lines during the on bias period in simultaneous emission driving methods.
Innovation Solution
A method of driving a display panel that adjusts the data sustaining voltage and on bias voltage levels during specific periods, using multiple voltage levels and switching elements to manage the voltage levels of control electrodes and anode electrodes of organic light emitting elements, thereby reducing peak current through the signal transmitting lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display panel size is increased, then the display area is improved, but the signal transmitting line width decreases leading to increased resistance and peak current
Solution Approach 1:
The patent applies preliminary action by adjusting the data sustaining voltage level before the on bias period begins. During an on bias compensating period prior to the on bias period, the data sustaining voltage is adjusted to a first level, and then to a second level, so that when the on bias voltage is applied, the peak current is reduced. This preparatory voltage adjustment prevents excessive current flow through the narrow signal transmitting lines in large display panels.
2Reliability
If the data sustaining voltage is adjusted during on bias compensating period, then the peak current is reduced, but the voltage level control complexity increases
Solution Approach 1:
The patent implements dynamics by making the data sustaining voltage adjustable and time-dependent. The voltage level changes dynamically based on the driving period: during the on bias compensating period, it transitions from a first level to a second level; during the on bias period, it maintains the second level; and during other periods, it returns to the first level. This dynamic adjustment is controlled by a voltage adjustment signal that coordinates with the on bias control signal, allowing peak current reduction without requiring complex hardware modifications.
Data Source
AI summary
A method of driving a display panel includes adjusting a level of a data sustaining voltage or an on bias voltage during an on bias compensating period, applying the on bias voltage to pixels through data lines during an on bias period, which is subsequent to the on bias compensating period, to adjust a voltage level of control electrodes of driving transistors of the pixels, initiating a voltage of anode electrodes of organic light emitting elements of the pixels during an initiating period, applying data voltages to the pixels through the data lines during a scanning period, and turning on the organic light emitting elements of the pixels during an emission period.