Demultiplexing Circuit Strobe Signal Frequency Reduction
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Solution Overview
Problem
High power consumption in display panels due to the high frequency transitions of strobe signals required for time division multiplexing in multiplexing modules, leading to increased energy usage during image display.
Innovation Solution
Implementing a demultiplexing circuit with two strobe signal lines that switch between enable and disable states at specific time nodes, allowing only single transitions per line scanning stage, thereby extending the signal period and reducing the frequency of the strobe signals, which reduces power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a multiplexing module is used to perform time division multiplexing on data signals, then the number of data signal fan-out lines is reduced, but the strobe signal frequency must be increased leading to higher power consumption
Solution Approach 1:
The patent inverts the conventional approach by using a demultiplexing circuit instead of a multiplexing module. The demultiplexing circuit receives a single data signal fan-out line and distributes it to multiple data signal lines through two strobe signals, achieving the opposite function of traditional multiplexing while reducing power consumption through lower frequency transitions
Solution Approach 2:
The patent changes the operating parameters of the strobe signals by controlling their transition timing. The first strobe signal transitions at a first time node while the second strobe signal transitions at a second time node, allowing the signals to remain unchanged at the end of each line scanning stage. This parameter optimization reduces the frequency of transitions and thereby lowers power consumption while maintaining effective time division multiplexing
2Productivity
If the strobe signal transitions frequently to control time division gating, then the multiplexing function is achieved, but the power consumption increases due to high frequency transitions
Solution Approach 1:
The patent implements periodic action by controlling the strobe signals to transition at specific time nodes within each line scanning stage. The first strobe signal transitions from first level to second level at a first time node, and the second strobe signal transitions from second level to first level at a second time node. This periodic, timed transition pattern achieves time division multiplexing while minimizing unnecessary transitions and reducing energy loss
Solution Approach 2:
The patent ensures continuity of useful action by maintaining the strobe signals at stable levels between transitions. At the end of each line scanning stage, both strobe signals remain unchanged, avoiding unnecessary transitions. This continuous stable state maintains the multiplexing function while reducing energy consumption compared to high-frequency switching
Data Source
AI summary
The application includes a display panel, display panel driving method and display apparatus. The display panel includes a demultiplexing circuit, of which, an input end is connected to a data signal fan-out line, two output ends are respectively connected to two data signal lines, and two control ends are connected to a first and second strobe signal line respectively. In an nth line scanning stage, a first strobe signal is switched from a disable signal to an enable signal at a first time node, and a second strobe signal is switched from the enable signal to the disable signal at a second time node. In an (n+1)th line scanning stage, the first strobe signal is switched from the enable signal to the disable signal at a third time node, and the second strobe signal is switched from the disable signal to the enable signal at a fourth time node.