OLED Pixel Voltage Retention Circuit for Power Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Active matrix organic light emitting displays consume similar power for displaying still frames and motion frames due to continuous operation of gate and data driving circuits, leading to high power consumption.
Innovation Solution
Incorporating a memory unit and voltage providing module that enables voltage retaining operations using auxiliary power voltages, allowing the display to reduce power consumption by disabling unnecessary circuits during still frame display, with the use of inverters and voltage selectors to manage power voltages and enable/disable voltage retaining operations based on auxiliary power voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gate driving circuit and data driving circuit continuously operate to provide gate and data signals for periodically performing writing operations on pixel circuits, then the display can maintain image display functionality, but the power consumption increases significantly
Solution Approach 1:
The patent applies dynamics by making the driving circuits operable in two distinct modes: a first operation mode for motion frames where circuits operate continuously, and a second operation mode for still frames where circuits are turned off after initial writing. This dynamic switching based on content type resolves the contradiction between maintaining display functionality and reducing power consumption.
Solution Approach 2:
The patent changes the operational parameter of the driving circuits from continuous operation to periodic/intermittent operation. By controlling the circuits to perform writing operations only at specific intervals during still frame display, the patent achieves significant power savings while maintaining the necessary display functionality through the pixel circuits' ability to retain voltage.
2Use of energy by moving object
If the gate driving circuit and data driving circuit are turned off during still frame display to reduce power consumption, then energy is conserved, but the pixel circuits cannot retain voltage without continuous writing operations
Solution Approach 1:
The patent applies preliminary action by performing the voltage writing operation to pixel circuits before turning off the driving circuits during still frame display. By ensuring that the pixel circuits have already received and stored the necessary voltage information in advance, the system can safely power down the driving circuits without compromising the displayed image, thus resolving the contradiction between power savings and voltage retention.
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
Significantly reduces power consumption by enabling pixel data self-retaining functionality during still frame display, allowing the gate and data driving circuits to be turned off, thereby conserving energy without compromising image quality.
Implementation Method 1
The organic light emitting diode, electrically connected to the current driving unit, is utilized for generating a light output according to the driving current
Data Source
AI summary
An organic light emitting display includes a current driving unit, an organic light emitting diode and a memory unit. The current driving unit is employed to provide a driving current according to a driving voltage generated therein. The organic light emitting diode generates a light output based on the driving current. The operation of the memory unit is controlled by a first auxiliary power voltage and a second auxiliary power voltage. When the first auxiliary power voltage is greater than the second auxiliary power voltage, the memory unit is enabled to perform a voltage retaining operation on the driving voltage. When the second auxiliary power voltage is greater than the first auxiliary power voltage, the memory unit is disabled for ceasing the voltage retaining operation.