LCD Control Circuit Standby Power Segmentation
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Solution Overview
Problem
Existing LCDs continue to consume unnecessary power by providing power voltage to the control circuit even when the liquid crystal panel is in standby mode, leading to increased power consumption.
Innovation Solution
Incorporating a switch circuit that receives feedback signals from the control circuit to control the power board's operation, allowing it to stop providing DC power voltage to the control circuit and instead use auxiliary power voltage from the video source to maintain the liquid crystal panel in standby mode, thereby reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power board continues to provide power voltage to the control circuit during standby mode, then the control circuit can maintain full functionality, but unnecessary power is consumed
Solution Approach 1:
The power supply system is segmented into two independent power sources: the power board providing DC power voltage for full functionality, and the video source providing auxiliary power voltage for standby mode. This segmentation allows selective power provisioning based on operational mode, resolving the contradiction between maintaining control circuit functionality and reducing power consumption during standby.
Solution Approach 2:
The power provisioning to the control circuit is made dynamic through the switch circuit, which can transition between connecting the power board (full power mode) and the video source (standby mode) based on the operational state. This dynamic switching enables the system to adapt power consumption to actual needs, maintaining reliability when required while minimizing energy use during standby.
2Use of energy by moving object
If the power board stops providing DC power voltage to the control circuit during standby mode, then power consumption is reduced, but the control circuit cannot maintain full functionality
Solution Approach 1:
The switch circuit acts as an intermediary that selectively connects either the power board or the video source to the control circuit based on operational mode. During standby, it mediates by routing auxiliary power voltage from the video source to the control circuit, enabling reduced power consumption while maintaining sufficient functionality through this intermediate power provisioning.
3Use of energy by moving object
If a switch circuit is added to control power board operation based on feedback signals, then power consumption during standby is reduced, but device complexity increases
Solution Approach 1:
The switch circuit is designed with multi-functionality, serving both as a power routing element and as a feedback signal transmission medium. The feedback signal line复用 (reuses) the existing control signal pathway, allowing the switch circuit to perform dual functions: controlling power flow and communicating operational state. This reduces the need for separate feedback circuitry, thereby limiting the increase in device complexity while achieving power consumption reduction.
Data Source
AI summary
A liquid crystal display includes a liquid crystal panel switchable between normal mode for displaying images and standby mode, a control circuit coupled to the liquid crystal panel controlling the liquid crystal panel mode according to video signals transmitted thereto, and a power board providing a power voltage to the control circuit. When the liquid crystal panel is in a standby mode, the control circuit outputs a corresponding feedback signal to interrupt power voltage supply from the power board to the control circuit.