Display Device Power-Off Voltage Sequence Control
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Solution Overview
Problem
Display devices face issues with display defects due to uncontrolled signal and voltage transitions during power-off or shutdown, leading to potential display of unpredicted images after power restoration.
Innovation Solution
A display device with a controller managing pixel power voltage, data voltage, and gate control signal to sequentially or simultaneously reach ground voltage levels during power-off, and return to normal levels during power-on, ensuring no unintended image display by controlling the voltage transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If signals and voltages are blocked after shutdown or power-off, then power consumption is reduced, but display defects may occur due to uncontrolled voltage transitions
Solution Approach 1:
The patent applies preliminary action by controlling voltages to reach ground level in a specific sequence before complete power-off. The pixel power voltage is reduced to ground level first, followed by the data voltage, and finally the gate control signal. This pre-planned voltage reduction sequence prevents display defects while ensuring complete power shutdown, resolving the contradiction between energy savings and display reliability.
2Reliability
If voltages are reduced to ground level sequentially during power-off, then display defects are prevented, but the power-off process becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing the power-off process into distinct sequential stages: first reducing pixel power voltage to ground level, then reducing data voltage to ground level, and finally reducing gate control signal to ground level. This segmentation of the voltage reduction process into manageable steps makes the complex sequence controllable and implementable, preventing display defects while maintaining manageable system complexity.
3Ease of operation
If all voltages reach ground level simultaneously during shutdown, then control is simplified, but residual images may be displayed
Solution Approach 1:
The patent applies preliminary action by establishing a predetermined voltage reduction sequence that must be followed during shutdown. By specifying that pixel power voltage reaches ground level first, followed by data voltage, and finally gate control signal, the system ensures proper image display control while maintaining ease of operation through automated sequence control. This prevents residual images from being displayed while keeping the control process manageable.
Data Source
AI summary
A display device includes a display panel including a plurality of pixels, a gate driver which provides a gate signal to corresponding pixels of the plurality of pixels, a data driver which provides a data voltage to the corresponding pixels of the plurality of pixels, a power voltage generator which provides a pixel power voltage to each of the plurality of pixels, and provides a gate power voltage to the gate driver, and a controller which provides a gate control signal to the gate driver. The pixel power voltage, the data voltage, and the gate control signal sequentially have a ground voltage level in response to a power-off signal.