OLED Pixel Driving Circuit for Power Reduction
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Solution Overview
Problem
Organic light emitting display devices face high power consumption issues, particularly when not in use, leading to inefficiencies and increased energy expenditure.
Innovation Solution
A pixel structure and driving method for organic light emitting display devices that includes a driving circuit with transistors and a storage capacitor, allowing for reduced power consumption by controlling current flow and voltage levels, and a display panel with non-overlapping areas that can differentiate between usage states to adjust scan and emission control signals accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display device operates continuously to maintain display functionality, then the display can respond to user input, but power consumption increases excessively
Solution Approach 1:
The patent implements dynamic operation modes where the display can switch between active display mode and inactive mode. The driving circuit dynamically adjusts its operation based on whether scan signals are being supplied, allowing the display to maintain functionality when needed while reducing power consumption during idle periods.
Solution Approach 2:
The display operates in periodic cycles where scan signals are supplied during active periods and halted during inactive periods. This periodic activation allows the display to maintain reliability during use while significantly reducing power consumption when not in use by stopping the supply of scan signals to the pixels.
2Adaptability or versatility
If scan signals are continuously supplied to all pixels, then all pixels can emit light when needed, but power consumption increases during idle periods
Solution Approach 1:
The patent applies local quality control by enabling or disabling specific pixels based on their usage state. When a pixel is not in use, the driving circuit stops supplying scan signals to that specific pixel, allowing it to maintain emission capability when needed while consuming minimal power during idle periods.
Solution Approach 2:
Instead of continuously supplying scan signals to all pixels, the patent supplies signals only to the necessary subset of pixels at any given time. This partial action approach ensures that pixels maintain their emission functionality when required while avoiding excessive power consumption during idle periods.
3Use of energy by moving object
If the display device is divided into multiple display areas, then power consumption can be reduced in unused areas, but device complexity increases
Solution Approach 1:
The patent segments the display into multiple display areas, each independently controllable through the driving circuit. This segmentation allows the system to supply scan signals to only the active display area while leaving inactive areas in a low-power state, reducing overall power consumption without requiring complex additional control mechanisms.
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 effectively reduces power consumption by ensuring organic light emitting diodes emit no light when not in use, thereby minimizing energy usage and prolonging device lifespan.
Implementation Method 1
a pixel including an organic light emitting diode
Data Source
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AI summary
A pixel includes an organic light emitting diode (OLED), and a driving circuit configured to supply current to the organic light emitting diode, the driving circuit including a driving transistor (DT) configured to control a level of the current flowing in the organic light emitting diode based on a level of a voltage supplied to a data line (Db), and a first transistor (T1) including a first electrode electrically connected to an anode of the organic light emitting diode, a second electrode configured to receive an initialization power (Vint), and a gate electrode electrically connected to the data line, wherein the first transistor is configured to supply the initialization power to the anode of the organic light emitting diode when the first transistor is turned on such that the organic light emitting diode does not emit light.