OLED Driving Circuit with Selective Voltage Sources
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Solution Overview
Problem
Existing active matrix organic light emitting displays (OLEDs) face issues with power consumption and transistor deterioration due to the need for uniform voltage supply across all light emitting units, leading to increased power consumption and reduced lifespan.
Innovation Solution
The implementation of a driving unit connected to multiple light emitting diodes, with separate voltage sources and a selection unit to supply distinct voltages to each diode, allowing for individual voltage control and reducing the load on the driving transistor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the same voltage is supplied to all light emitting units, then uniformity of emitted light is achieved, but power consumption is increased and transistor deterioration occurs
Solution Approach 1:
The patent applies local quality by dividing the light emitting units into multiple groups, where each group receives a different voltage level. Instead of uniformly supplying the same voltage to all units, the system provides locally optimized voltages - higher voltage to units with lower emitting efficiency and lower voltage to units with higher emitting efficiency. This resolves the contradiction by maintaining overall uniformity while reducing total power consumption through localized voltage adjustment.
2Stability of the object's composition
If the same voltage is supplied to all light emitting units, then uniformity of emitted light is achieved, but transistor deterioration occurs and lifetime is reduced
Solution Approach 1:
The patent implements local quality by creating multiple voltage supply groups where each group is optimized for its specific light emitting units. By supplying appropriately reduced voltages to certain groups rather than uniformly high voltage to all units, the system reduces stress on driving transistors, minimizing deterioration and extending OLED lifetime while maintaining uniform visual output through compensatory control mechanisms.
3Use of energy by moving object
If multiple voltage sources are introduced to supply different voltages, then power consumption is reduced, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the light emitting units into multiple groups and introducing multiple voltage sources corresponding to each group. This segmentation allows independent voltage control for each group, enabling optimized power consumption. The complexity is managed by organizing the segmentation in a systematic manner where each voltage source serves a specific group of units with similar characteristics.
Solution Approach 2:
The patent implements universality by designing the multiple voltage sources to work within a unified control framework. The voltage sources, while providing different voltage levels, are integrated into a single driving unit that coordinates their operation. This multi-functional approach allows the system to handle different voltage requirements while maintaining overall system simplicity through centralized control logic.
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 decreases power consumption, minimizes transistor deterioration, and extends the lifespan of the OLED by optimizing voltage distribution across the light emitting diodes.
Implementation Method 1
a light emitting unit comprising at least two light emitting diodes which are electrically connected to the same driving unit to emit a light
Data Source
AI summary
There are provided a light emitting display comprising at least a light emitting unit comprising at least two light emitting diodes which are electrically connected to the same driving unit to emit light, and a plurality of voltage sources whereby one voltage source supplies a voltage different from the other voltage(s) supplied from the other voltage source(s) to each of the light emitting diodes.