Display Panel Leakage Current Compensation via Dynamic Voltage Adjustment
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Solution Overview
Problem
Display panels face a delay in responding to changes in image luminance due to leakage currents, leading to suboptimal luminance display and potential over- or under-compensation of driving currents, especially when transitioning from black to white images, as existing methods do not account for temperature changes and pixel characteristics.
Innovation Solution
A display device with a power manager that measures currents through separate power supply lines and a panel driver that adjusts gate-on, gate-off, and initialization voltages based on current differences to compensate for leakage currents, using tables to store voltage levels corresponding to these differences for real-time control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the data voltage is increased to improve response speed, then the luminance response improves, but leakage current increases causing over-compensation
Solution Approach 1:
The patent measures the actual current flowing through the display panel and uses this feedback to dynamically adjust the data voltage. The current measurement unit monitors the current in real-time, and the control unit modifies the data voltage based on the measured current to achieve precise compensation without over-compensation, resolving the contradiction between response speed and leakage current.
Solution Approach 2:
The patent changes the data voltage parameter dynamically based on measured current conditions. By adjusting the voltage level according to actual current flow and temperature conditions, the system optimizes response speed while preventing excessive leakage current, thus resolving the contradiction between fast response and energy loss.
2Speed
If a fixed compensation method is used to improve response speed, then the driving current increases, but temperature changes and pixel characteristics cause over- or under-compensation
Solution Approach 1:
The system continuously measures the actual current flowing through the display panel and uses this feedback to adjust the data voltage dynamically. This closed-loop control ensures accurate compensation that adapts to temperature changes and pixel characteristics, preventing both over-compensation and under-compensation while maintaining fast response speed.
Solution Approach 2:
The patent transitions from a fixed compensation method to a dynamic compensation method where the data voltage is continuously adjusted based on real-time current measurements. This dynamic approach allows the system to adapt to changing conditions such as temperature variations and pixel characteristics, ensuring precise driving current control.
Data Source
AI summary
A display device includes: a display panel including a plurality of pixels; a power manager to provide a first power supply voltage to the display panel through a first power supply line, and a second power supply voltage to the display panel through a second power supply line, and to measure a first current flowing through the first power supply line and a second current flowing through the second power supply line; and a panel driver to provide a panel driving voltage to the display panel, and to control the panel driving voltage according to a current difference between the first current and the second current.