Organic Light Emitting Display Power Saving Mode Voltage Control
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Solution Overview
Problem
The integration of a frame memory in organic light emitting display devices to reduce power consumption increases both power consumption and manufacturing costs, while existing solutions fail to effectively improve display quality and reduce power usage.
Innovation Solution
An organic light emitting display device that includes a display panel, a scan driver, a data driver, a power supply, and a controller, which selects between a normal driving mode and a power saving mode to control the scan driver, data driver, and power supply, allowing for the selective application of different voltages and control signals to reduce power consumption and maintain luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the display panel is driven at a low frequency to reduce power consumption, then power consumption is reduced, but luminance consistency deteriorates due to pixel leakage current
Solution Approach 1:
The patent applies periodic action by alternating between two voltage levels (first voltage and second voltage) at the second power terminal during different periods of the frame period. This periodic voltage switching compensates for pixel leakage current effects that accumulate during low-frequency operation, thereby maintaining luminance consistency while enabling power-saving low-frequency display mode
Solution Approach 2:
The patent changes voltage parameters by switching between a first voltage level during a first period and a second voltage level during a second period. This parameter change strategy compensates for the increased impact of pixel leakage current at low driving frequencies, ensuring luminance consistency is maintained while operating in power-saving mode
2Use of energy by moving object
If a frame memory is added to store image data for low-frequency driving, then power consumption is reduced, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts and eliminates the frame memory component from the display device architecture. Instead of using external memory to store image data for low-frequency operation, the invention achieves power-saving low-frequency driving through voltage switching control at the power terminal, thereby reducing device complexity and manufacturing cost while maintaining the power consumption benefits
3Stability of the object's composition
If the second voltage is applied continuously to compensate for leakage current, then luminance consistency is maintained, but power consumption increases
Solution Approach 1:
The patent applies periodic action by switching between first voltage and second voltage at different periods rather than continuously applying the second voltage. This periodic voltage application provides leakage current compensation only when necessary, maintaining luminance consistency while avoiding continuous high-power consumption
Solution Approach 2:
The patent implements dynamic voltage control by adaptively switching between voltage levels based on the display timing requirements. The voltage at the second power terminal dynamically changes between first and second voltage levels during different periods of the frame period, enabling efficient power consumption while maintaining luminance consistency through timed compensation
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 device achieves reduced power consumption by driving the display panel at a low frequency in power saving mode, maintaining consistent luminance and improving display quality through voltage adjustments and the coupling effect, while also increasing visibility in bright locations.
Implementation Method 1
The power supply may provide the second voltage to the second power terminal of the pixel in a first period of one frame period and provides the first voltage to the second power terminal of the pixel in a second period of one frame period
Implementation Method 2
Holes from the anode may be combined with electrons from the cathode in the organic layer between the anode and the cathode to emit light
Data Source
AI summary
An organic light emitting display device includes a display panel, a scan driver, a data driver, a power supply which provides a first voltage to a first power terminal of the pixel and selectively provides the first voltage or a second voltage to a second power terminal of the pixel, and a controller which selects one of a normal driving mode and a power saving mode as a panel driving mode where the power supply provides the second voltage to the second power terminal of the pixel in a first period of one frame period and provides the first voltage to the second power terminal of the pixel in a second period of one frame period when the panel driving mode is the power saving mode.