Display Driver Circuit Multiplexer Switch Control
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Solution Overview
Problem
The high power consumption in OLED display panels due to frequent switching of multiplexer switches, which is unavoidable given the large number of switches and their continuous operation, leads to significant energy expenditure.
Innovation Solution
Implementing a method where the display driver circuit controls the multiplexer switches to remain in a conducted state as long as the data voltages remain unchanged, reducing unnecessary toggling by entering a power-saving mode when consecutive data voltages are equal across multiple horizontal line periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the multiplexer switches are frequently switched to transmit data voltages to different data lines in every horizontal line period, then the data transmission function is achieved, but the power consumption increases significantly
Solution Approach 1:
The patent applies dynamics by making the switch control strategy adaptable rather than fixed. The control circuit dynamically adjusts the switch state based on whether data voltages change between consecutive horizontal line periods. When data voltages remain unchanged, switches are kept in conducted state; when they change, switches are toggled. This dynamic adaptation resolves the contradiction by optimizing power consumption without sacrificing data transmission efficiency.
Solution Approach 2:
The patent changes the control parameter from fixed periodic switching to variable switching based on data voltage stability. By monitoring whether data voltages change between horizontal line periods and adjusting the switch control accordingly, the system achieves parameter change that reduces unnecessary toggling while maintaining required data transmission functionality.
2Reliability
If the switches in the multiplexer are continuously toggled to update data voltages, then the image refresh function is maintained, but the power consumption becomes unacceptably high
Solution Approach 1:
The patent implements self-service by enabling the system to automatically detect when data voltages remain unchanged and autonomously enter a power-saving mode by maintaining switches in conducted state. The control circuit continuously monitors data voltage changes and self-adjusts the switching behavior without external intervention, achieving both energy savings and reliable image refresh when needed.
Solution Approach 2:
The patent modifies periodic action by conditionally applying different switching frequencies. Instead of uniform periodic toggling, the system uses periodic monitoring of data voltage changes and applies periodic switching only when necessary (when data voltages change). When data voltages remain stable across horizontal line periods, the periodic switching is suspended, reducing energy loss while maintaining image refresh reliability when content changes.
3Use of energy by stationary object
If the multiplexer operates in conventional mode with predetermined switching timing, then the control simplicity is maintained, but the power consumption cannot be reduced
Solution Approach 1:
The patent applies feedback by introducing a control circuit that monitors data voltage changes and uses this information to adjust switch control timing. The feedback mechanism compares data voltages between consecutive horizontal line periods and provides control signals to the multiplexer switches accordingly. This feedback-based approach reduces power consumption while the added control circuit complexity remains manageable due to the straightforward monitoring and control logic.
Data Source
AI summary
A display driver circuit is configured to drive a display panel having a multiplexer. A method for the display driver circuit includes steps of: sending, by the display driver circuit, a plurality of first data voltages to the display panel through a switch of the multiplexer; and outputting, by the display driver circuit, a control signal to the switch during a first period in which the plurality of first data voltages sent through the switch remain unchanged, wherein the control signal controls the switch to be turned on and keep in a conducted status until the display driver circuit sends a second data voltage different from the plurality of unchanged first data voltages through the switch.