Display Reset Circuit for Power-Transition Noise Isolation
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Solution Overview
Problem
During power-on and power-off of LCD monitors/TVs, the power supply and signals to the source driver unit are unstable, resulting in noise-like images on the display panel due to unknown states of output signals from the source driver unit.
Innovation Solution
A reset circuit using switches actuated by control pulses to output driving voltages through data lines based on existing timings of analog and digital power supplies, ensuring all outputs have a reset voltage level during transient periods, thereby eliminating noise-like images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the source driver unit operates during power-on and power-off, then the display can be immediately used, but noise-like images appear due to unstable power supply and signals
Solution Approach 1:
The reset circuit is activated before the source driver unit operates during power-on and power-off transitions. It preliminarily stabilizes the output signals by forcing them to a known state (reset voltage level) before normal operation begins, preventing noise-like images from appearing on the display
Solution Approach 2:
The reset circuit acts as an intermediary between the unstable power supply/signals and the source driver unit. It mediates the transient conditions by providing a controlled reset voltage through switches (first switch and second switch) that isolates the output channel from the data line during critical transition periods, preventing harmful noise from reaching the display panel
2Reliability
If the output channel is connected to the data line during power transitions, then signal transmission is maintained, but unstable signals cause noise-like images
Solution Approach 1:
The circuit dynamically changes the connection state of the output channel during power transitions. The second switch is controlled to isolate the output channel from the data line during transient periods when power supply and signals are unstable, while allowing normal connection during stable operation. This dynamic switching prevents noise-like images while maintaining signal transmission reliability
Data Source
AI summary
A circuit for resetting a display having at least one driver outputting a driving voltage through an output channel to a corresponding data line of a panel comprises a first switch and a second switch. The first switch is actuated by a control pulse to transfer a reset voltage to the data line of the panel. The second switch is actuated by the control pulse to electrically isolate the output channel of the driver from the data line of the panel, wherein the control pulse is asserted during transient periods resulting from power-on and power-off of the display.