Switching Circuit for LCD DC-DC Converter Power Control
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Solution Overview
Problem
Liquid crystal display devices experience abnormal operation and increased power consumption during the pause mode due to the DC-DC converter and panel driving circuit being driven by induced data signals when the module operation power and backlight operation power are cut off.
Innovation Solution
A switching circuit is introduced to control the input of the DC-DC converter, ensuring it is cut off if either the module operation power or the backlight operation power is not supplied, preventing abnormal operation and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the module operation power and backlight operation power are cut off during pause mode, then power consumption is reduced, but the DC-DC converter and panel driving circuit are abnormally driven by induced data signals
Solution Approach 1:
A switching circuit is introduced as an intermediary component between the power supply and the DC-DC converter/panel driving circuit. This switching circuit controls the power input based on the pause/play state, preventing induced data signals from abnormally driving the circuits while maintaining the ability to supply power when needed. The switching circuit acts as a mediator that blocks the harmful induced signals during pause mode while allowing normal operation during play mode.
2Loss of time
If the DC-DC converter is continuously operated, then the system is ready for quick resumption, but power consumption increases during pause mode
Solution Approach 1:
The power supply to the DC-DC converter is made dynamic rather than static. The switching circuit dynamically adjusts the power input state based on the operational mode (pause or play). During pause mode, the switching circuit cuts off power to reduce consumption, while during play mode, it restores power for normal operation. This dynamic control resolves the contradiction between continuous readiness and power savings.
Data Source
AI summary
A liquid crystal display device is provided to prevent a liquid crystal module from being driven abnormally. The liquid crystal display device comprises a liquid crystal display panel displaying a picture corresponding to a data; a DC-DC converter for generating driving voltages necessary for driving the liquid crystal display panel; a system for supplying the data, a module operation power and a backlight operation power in a play state, and cutting off the module operation power and the backlight operation power while supplying the data in a pause state; and a switching circuit for controlling an input of the DC-DC converter whether or not the module operation power and the backlight operation power are supplied, wherein the input of the DC-DC converter is cut-off if either the module operation power or the backlight operation power is not input to the switching circuit.