Pause Driving Mode for Organic EL Display Power Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Organic EL display devices using time-division driving experience increased power consumption due to higher driving frequencies, which is a limitation in achieving efficient power management, especially during still image display.
Innovation Solution
The implementation of a mode-switchable display device that alternates between time-division driving and pause driving, where the latter reduces refresh rates and power consumption by grouping pixel circuits and controlling light-emission control lines to minimize active states during still image display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If time-division driving is adopted to display multiple colors sequentially, then device complexity is reduced and slimming down is achieved, but power consumption increases due to higher driving frequencies
Solution Approach 1:
The patent implements a dual driving mode system that dynamically switches between time-division driving and pause driving based on display content. When displaying still images, the system transitions to pause driving mode which maintains the simplified structure benefits while significantly reducing the driving frequency of peripheral drivers, thereby resolving the contradiction between structural simplicity and power consumption.
Solution Approach 2:
The patent changes the operational parameters of the display device by introducing a pause driving mode with lower refresh rates for still images. This parameter change allows the system to maintain the structural advantages of time-division driving while adjusting the driving frequency to reduce power consumption, directly addressing the energy consumption issue.
2Manufacturing precision
If time-division driving is used to bring electro-optical elements into light-emitting state sequentially, then manufacturing precision is improved, but loss of energy increases due to continuous high-frequency operation
Solution Approach 1:
The patent implements periodic action by introducing pause periods between refresh periods in the pause driving mode. During these pause periods, the peripheral drivers are turned off or operate at minimal frequency, creating a periodic on-off pattern that maintains image quality while significantly reducing energy loss compared to continuous high-frequency operation.
Solution Approach 2:
The system dynamically adjusts the driving frequency based on the display content type. For still images, it switches to pause driving with lower frequency and periodic pauses, while maintaining time-division driving at higher frequency for moving images, thereby optimizing the balance between manufacturing precision and energy loss.
3Reliability
If refresh rate is increased to maintain image quality in time-division driving, then reliability of image display is improved, but use of energy by stationary object increases
Solution Approach 1:
The patent implements dynamic operation mode switching that adapts the refresh rate to the display content. When displaying still images, the system switches to pause driving mode with lower refresh rates, maintaining adequate image quality while significantly reducing the power consumption of the stationary display device. For moving images, it returns to time-division driving with higher refresh rates to ensure reliability.
Solution Approach 2:
The patent changes the operational parameters by introducing variable refresh rates based on content type. The pause driving mode uses lower refresh rates for still images, while time-division driving uses higher refresh rates for moving images, thereby optimizing the balance between image display reliability and energy consumption.
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 significantly reduces power consumption by lowering the frequency of peripheral driver operations and extending the pause period, thereby enhancing the energy efficiency of organic EL display devices.
Implementation Method 1
an organic EL element whose luminance is controlled by a current flowing therethrough includes an organic EL (Electro Luminescence) element
Data Source
AI summary
In a display device that has self light-emitting type display elements and that adopts time-division driving, power consumption is reduced over the conventional one. Each of emission lines is connected to the gate terminals of light-emission control transistors provided for organic EL elements of different light-emitting colors in three pixel circuits arranged side by side in an extension direction of scanning signal lines. When there is no change in image content throughout a period longer than or equal to a predetermined period during a time-division driving mode, an operating mode is switched to a pause driving mode. During the pause driving mode, emission drivers bring only first emission lines into a selected state, by which a still image with a ⅓ resolution of an image displayed during the time-division driving mode is displayed on a display unit. During a pause period, peripheral drivers go into a pause state.