OLED Display Voltage Stabilization Circuit for Standby Power Reduction
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Solution Overview
Problem
Display devices, particularly organic light emitting diode (OLED) displays, face high power consumption during standby screen periods due to the need to maintain image display functionality, leading to inefficiencies in power usage.
Innovation Solution
A display device and data driving circuit design that includes an always-on display area and a black grayscale area, with an image display voltage output circuit and a voltage stabilization circuit, where the voltage stabilization circuit provides a constant voltage to the black grayscale area during standby, reducing power consumption by minimizing the operation of the image display voltage output circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the image display voltage output circuit operates continuously to maintain display functionality during standby, then the display can show notifications and information, but power consumption increases
Solution Approach 1:
The display panel is divided into two distinct areas: an always-on display area that remains active to show notifications and information, and a black grayscale area that is turned off or dimmed to reduce power consumption. This spatial segmentation allows different power management strategies for different functional regions, resolving the contradiction between maintaining display functionality and reducing power usage during standby periods.
Solution Approach 2:
Different voltage levels are applied to different areas of the display panel. The always-on display area receives normal display voltages to maintain full functionality, while the black grayscale area receives reduced or zero voltage to minimize power consumption. This local differentiation of voltage quality enables the system to preserve essential display functions while eliminating unnecessary power drain from inactive regions.
2Use of energy by moving object
If the voltage stabilization circuit outputs constant voltage to the black grayscale area, then power consumption is reduced, but the image display voltage output circuit must still operate for the always-on area
Solution Approach 1:
A multiplexer is introduced as an intermediary component that selectively switches between the image display voltage output circuit and the voltage stabilization circuit based on the operational area. During standby periods, the multiplexer routes the voltage stabilization circuit's output to the black grayscale area while allowing the image display voltage output circuit to remain operational for the always-on display area. This intermediary component manages the complexity of having dual voltage sources while enabling efficient power management.
Solution Approach 2:
The system dynamically switches between different voltage output modes based on operational requirements. The multiplexer changes its routing configuration depending on whether the display is in active or standby state, and whether specific areas need full display functionality or power-saving mode. This dynamic adaptability allows the circuit to optimize power consumption in real-time while maintaining necessary display functions.
Data Source
AI summary
Embodiments of the disclosure relate to a display device and a data driving circuit. Specifically, there may be provided a display device with enhanced power efficiency and a data driving circuit by providing a display device including a display panel divided into an always-on display area displaying information during a standby screen period and a black grayscale area except for the always-on display area, an image display voltage output circuit outputting a data voltage to input to the always-on display area during the standby screen period, and a voltage stabilization circuit outputting a constant voltage to input to at least a partial area of the black grayscale area during the standby screen period.